![Maciej Żenczykowski](/assets/img/avatar_default.png)
Routes can specify an mtu explicitly or inherit the mtu from the underlying device - this inheritance is implemented in dst->ops->mtu handlers ip6_mtu() and ip6_blackhole_mtu(). Currently changing the mtu of a device adds mtu explicitly to routes using that device. ie. # ip link set dev lo mtu 65536 # ip -6 route add local 2000::1 dev lo # ip -6 route get 2000::1 local 2000::1 dev lo table local src ... metric 1024 pref medium # ip link set dev lo mtu 65535 # ip -6 route get 2000::1 local 2000::1 dev lo table local src ... metric 1024 mtu 65535 pref medium # ip link set dev lo mtu 65536 # ip -6 route get 2000::1 local 2000::1 dev lo table local src ... metric 1024 mtu 65536 pref medium # ip -6 route del local 2000::1 After this patch the route entry no longer changes unless it already has an mtu. There is no need: this inheritance is already done in ip6_mtu() # ip link set dev lo mtu 65536 # ip -6 route add local 2000::1 dev lo # ip -6 route add local 2000::2 dev lo mtu 2000 # ip -6 route get 2000::1; ip -6 route get 2000::2 local 2000::1 dev lo table local src ... metric 1024 pref medium local 2000::2 dev lo table local src ... metric 1024 mtu 2000 pref medium # ip link set dev lo mtu 65535 # ip -6 route get 2000::1; ip -6 route get 2000::2 local 2000::1 dev lo table local src ... metric 1024 pref medium local 2000::2 dev lo table local src ... metric 1024 mtu 2000 pref medium # ip link set dev lo mtu 1501 # ip -6 route get 2000::1; ip -6 route get 2000::2 local 2000::1 dev lo table local src ... metric 1024 pref medium local 2000::2 dev lo table local src ... metric 1024 mtu 1501 pref medium # ip link set dev lo mtu 65536 # ip -6 route get 2000::1; ip -6 route get 2000::2 local 2000::1 dev lo table local src ... metric 1024 pref medium local 2000::2 dev lo table local src ... metric 1024 mtu 65536 pref medium # ip -6 route del local 2000::1 # ip -6 route del local 2000::2 This is desirable because changing device mtu and then resetting it to the previous value shouldn't change the user visible routing table. Signed-off-by: Maciej Żenczykowski <maze@google.com> CC: Eric Dumazet <edumazet@google.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
3888 lines
93 KiB
C
3888 lines
93 KiB
C
/*
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* Linux INET6 implementation
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* FIB front-end.
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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/* Changes:
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*
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* YOSHIFUJI Hideaki @USAGI
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* reworked default router selection.
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* - respect outgoing interface
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* - select from (probably) reachable routers (i.e.
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* routers in REACHABLE, STALE, DELAY or PROBE states).
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* - always select the same router if it is (probably)
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* reachable. otherwise, round-robin the list.
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* Ville Nuorvala
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* Fixed routing subtrees.
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*/
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#define pr_fmt(fmt) "IPv6: " fmt
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/types.h>
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#include <linux/times.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/route.h>
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#include <linux/netdevice.h>
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#include <linux/in6.h>
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#include <linux/mroute6.h>
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#include <linux/init.h>
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#include <linux/if_arp.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/nsproxy.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/snmp.h>
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#include <net/ipv6.h>
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#include <net/ip6_fib.h>
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#include <net/ip6_route.h>
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#include <net/ndisc.h>
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#include <net/addrconf.h>
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#include <net/tcp.h>
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#include <linux/rtnetlink.h>
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#include <net/dst.h>
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#include <net/dst_metadata.h>
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#include <net/xfrm.h>
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#include <net/netevent.h>
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#include <net/netlink.h>
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#include <net/nexthop.h>
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#include <net/lwtunnel.h>
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#include <net/ip_tunnels.h>
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#include <net/l3mdev.h>
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#include <trace/events/fib6.h>
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#include <asm/uaccess.h>
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#ifdef CONFIG_SYSCTL
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#include <linux/sysctl.h>
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#endif
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enum rt6_nud_state {
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RT6_NUD_FAIL_HARD = -3,
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RT6_NUD_FAIL_PROBE = -2,
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RT6_NUD_FAIL_DO_RR = -1,
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RT6_NUD_SUCCEED = 1
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};
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static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort);
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static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie);
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static unsigned int ip6_default_advmss(const struct dst_entry *dst);
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static unsigned int ip6_mtu(const struct dst_entry *dst);
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static struct dst_entry *ip6_negative_advice(struct dst_entry *);
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static void ip6_dst_destroy(struct dst_entry *);
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static void ip6_dst_ifdown(struct dst_entry *,
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struct net_device *dev, int how);
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static int ip6_dst_gc(struct dst_ops *ops);
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static int ip6_pkt_discard(struct sk_buff *skb);
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static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb);
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static int ip6_pkt_prohibit(struct sk_buff *skb);
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static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb);
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static void ip6_link_failure(struct sk_buff *skb);
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static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb, u32 mtu);
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static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb);
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static void rt6_dst_from_metrics_check(struct rt6_info *rt);
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static int rt6_score_route(struct rt6_info *rt, int oif, int strict);
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#ifdef CONFIG_IPV6_ROUTE_INFO
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static struct rt6_info *rt6_add_route_info(struct net *net,
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const struct in6_addr *prefix, int prefixlen,
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const struct in6_addr *gwaddr,
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struct net_device *dev,
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unsigned int pref);
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static struct rt6_info *rt6_get_route_info(struct net *net,
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const struct in6_addr *prefix, int prefixlen,
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const struct in6_addr *gwaddr,
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struct net_device *dev);
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#endif
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struct uncached_list {
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spinlock_t lock;
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struct list_head head;
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};
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static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt6_uncached_list);
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static void rt6_uncached_list_add(struct rt6_info *rt)
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{
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struct uncached_list *ul = raw_cpu_ptr(&rt6_uncached_list);
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rt->dst.flags |= DST_NOCACHE;
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rt->rt6i_uncached_list = ul;
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spin_lock_bh(&ul->lock);
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list_add_tail(&rt->rt6i_uncached, &ul->head);
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spin_unlock_bh(&ul->lock);
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}
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static void rt6_uncached_list_del(struct rt6_info *rt)
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{
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if (!list_empty(&rt->rt6i_uncached)) {
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struct uncached_list *ul = rt->rt6i_uncached_list;
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spin_lock_bh(&ul->lock);
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list_del(&rt->rt6i_uncached);
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spin_unlock_bh(&ul->lock);
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}
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}
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static void rt6_uncached_list_flush_dev(struct net *net, struct net_device *dev)
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{
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struct net_device *loopback_dev = net->loopback_dev;
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int cpu;
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if (dev == loopback_dev)
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return;
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for_each_possible_cpu(cpu) {
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struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
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struct rt6_info *rt;
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spin_lock_bh(&ul->lock);
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list_for_each_entry(rt, &ul->head, rt6i_uncached) {
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struct inet6_dev *rt_idev = rt->rt6i_idev;
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struct net_device *rt_dev = rt->dst.dev;
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if (rt_idev->dev == dev) {
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rt->rt6i_idev = in6_dev_get(loopback_dev);
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in6_dev_put(rt_idev);
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}
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if (rt_dev == dev) {
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rt->dst.dev = loopback_dev;
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dev_hold(rt->dst.dev);
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dev_put(rt_dev);
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}
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}
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spin_unlock_bh(&ul->lock);
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}
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}
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static u32 *rt6_pcpu_cow_metrics(struct rt6_info *rt)
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{
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return dst_metrics_write_ptr(rt->dst.from);
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}
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static u32 *ipv6_cow_metrics(struct dst_entry *dst, unsigned long old)
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{
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struct rt6_info *rt = (struct rt6_info *)dst;
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if (rt->rt6i_flags & RTF_PCPU)
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return rt6_pcpu_cow_metrics(rt);
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else if (rt->rt6i_flags & RTF_CACHE)
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return NULL;
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else
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return dst_cow_metrics_generic(dst, old);
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}
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static inline const void *choose_neigh_daddr(struct rt6_info *rt,
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struct sk_buff *skb,
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const void *daddr)
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{
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struct in6_addr *p = &rt->rt6i_gateway;
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if (!ipv6_addr_any(p))
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return (const void *) p;
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else if (skb)
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return &ipv6_hdr(skb)->daddr;
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return daddr;
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}
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static struct neighbour *ip6_neigh_lookup(const struct dst_entry *dst,
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struct sk_buff *skb,
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const void *daddr)
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{
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struct rt6_info *rt = (struct rt6_info *) dst;
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struct neighbour *n;
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daddr = choose_neigh_daddr(rt, skb, daddr);
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n = __ipv6_neigh_lookup(dst->dev, daddr);
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if (n)
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return n;
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return neigh_create(&nd_tbl, daddr, dst->dev);
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}
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static struct dst_ops ip6_dst_ops_template = {
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.family = AF_INET6,
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.gc = ip6_dst_gc,
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.gc_thresh = 1024,
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.check = ip6_dst_check,
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.default_advmss = ip6_default_advmss,
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.mtu = ip6_mtu,
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.cow_metrics = ipv6_cow_metrics,
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.destroy = ip6_dst_destroy,
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.ifdown = ip6_dst_ifdown,
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.negative_advice = ip6_negative_advice,
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.link_failure = ip6_link_failure,
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.update_pmtu = ip6_rt_update_pmtu,
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.redirect = rt6_do_redirect,
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.local_out = __ip6_local_out,
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.neigh_lookup = ip6_neigh_lookup,
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};
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static unsigned int ip6_blackhole_mtu(const struct dst_entry *dst)
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{
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unsigned int mtu = dst_metric_raw(dst, RTAX_MTU);
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return mtu ? : dst->dev->mtu;
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}
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static void ip6_rt_blackhole_update_pmtu(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb, u32 mtu)
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{
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}
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static void ip6_rt_blackhole_redirect(struct dst_entry *dst, struct sock *sk,
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struct sk_buff *skb)
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{
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}
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static struct dst_ops ip6_dst_blackhole_ops = {
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.family = AF_INET6,
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.destroy = ip6_dst_destroy,
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.check = ip6_dst_check,
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.mtu = ip6_blackhole_mtu,
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.default_advmss = ip6_default_advmss,
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.update_pmtu = ip6_rt_blackhole_update_pmtu,
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.redirect = ip6_rt_blackhole_redirect,
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.cow_metrics = dst_cow_metrics_generic,
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.neigh_lookup = ip6_neigh_lookup,
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};
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static const u32 ip6_template_metrics[RTAX_MAX] = {
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[RTAX_HOPLIMIT - 1] = 0,
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};
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static const struct rt6_info ip6_null_entry_template = {
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.dst = {
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.__refcnt = ATOMIC_INIT(1),
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.__use = 1,
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.obsolete = DST_OBSOLETE_FORCE_CHK,
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.error = -ENETUNREACH,
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.input = ip6_pkt_discard,
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.output = ip6_pkt_discard_out,
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},
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.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
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.rt6i_protocol = RTPROT_KERNEL,
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.rt6i_metric = ~(u32) 0,
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.rt6i_ref = ATOMIC_INIT(1),
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};
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#ifdef CONFIG_IPV6_MULTIPLE_TABLES
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static const struct rt6_info ip6_prohibit_entry_template = {
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.dst = {
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.__refcnt = ATOMIC_INIT(1),
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.__use = 1,
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.obsolete = DST_OBSOLETE_FORCE_CHK,
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.error = -EACCES,
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.input = ip6_pkt_prohibit,
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.output = ip6_pkt_prohibit_out,
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},
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.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
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.rt6i_protocol = RTPROT_KERNEL,
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.rt6i_metric = ~(u32) 0,
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.rt6i_ref = ATOMIC_INIT(1),
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};
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static const struct rt6_info ip6_blk_hole_entry_template = {
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.dst = {
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.__refcnt = ATOMIC_INIT(1),
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.__use = 1,
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.obsolete = DST_OBSOLETE_FORCE_CHK,
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.error = -EINVAL,
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.input = dst_discard,
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.output = dst_discard_out,
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},
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.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
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.rt6i_protocol = RTPROT_KERNEL,
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.rt6i_metric = ~(u32) 0,
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.rt6i_ref = ATOMIC_INIT(1),
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};
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#endif
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static void rt6_info_init(struct rt6_info *rt)
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{
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struct dst_entry *dst = &rt->dst;
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memset(dst + 1, 0, sizeof(*rt) - sizeof(*dst));
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INIT_LIST_HEAD(&rt->rt6i_siblings);
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INIT_LIST_HEAD(&rt->rt6i_uncached);
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}
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/* allocate dst with ip6_dst_ops */
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static struct rt6_info *__ip6_dst_alloc(struct net *net,
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struct net_device *dev,
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int flags)
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{
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struct rt6_info *rt = dst_alloc(&net->ipv6.ip6_dst_ops, dev,
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0, DST_OBSOLETE_FORCE_CHK, flags);
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if (rt)
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rt6_info_init(rt);
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return rt;
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}
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struct rt6_info *ip6_dst_alloc(struct net *net,
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struct net_device *dev,
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int flags)
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{
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struct rt6_info *rt = __ip6_dst_alloc(net, dev, flags);
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if (rt) {
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rt->rt6i_pcpu = alloc_percpu_gfp(struct rt6_info *, GFP_ATOMIC);
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if (rt->rt6i_pcpu) {
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int cpu;
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for_each_possible_cpu(cpu) {
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struct rt6_info **p;
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p = per_cpu_ptr(rt->rt6i_pcpu, cpu);
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/* no one shares rt */
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*p = NULL;
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}
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} else {
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dst_destroy((struct dst_entry *)rt);
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return NULL;
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}
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}
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return rt;
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}
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EXPORT_SYMBOL(ip6_dst_alloc);
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static void ip6_dst_destroy(struct dst_entry *dst)
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{
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struct rt6_info *rt = (struct rt6_info *)dst;
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struct dst_entry *from = dst->from;
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struct inet6_dev *idev;
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dst_destroy_metrics_generic(dst);
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free_percpu(rt->rt6i_pcpu);
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rt6_uncached_list_del(rt);
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idev = rt->rt6i_idev;
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if (idev) {
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rt->rt6i_idev = NULL;
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in6_dev_put(idev);
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}
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dst->from = NULL;
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dst_release(from);
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}
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static void ip6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
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int how)
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{
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struct rt6_info *rt = (struct rt6_info *)dst;
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struct inet6_dev *idev = rt->rt6i_idev;
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struct net_device *loopback_dev =
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dev_net(dev)->loopback_dev;
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if (dev != loopback_dev) {
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if (idev && idev->dev == dev) {
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struct inet6_dev *loopback_idev =
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in6_dev_get(loopback_dev);
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if (loopback_idev) {
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rt->rt6i_idev = loopback_idev;
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in6_dev_put(idev);
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}
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}
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}
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}
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static bool __rt6_check_expired(const struct rt6_info *rt)
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{
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if (rt->rt6i_flags & RTF_EXPIRES)
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return time_after(jiffies, rt->dst.expires);
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else
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return false;
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}
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static bool rt6_check_expired(const struct rt6_info *rt)
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{
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if (rt->rt6i_flags & RTF_EXPIRES) {
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if (time_after(jiffies, rt->dst.expires))
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return true;
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} else if (rt->dst.from) {
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return rt6_check_expired((struct rt6_info *) rt->dst.from);
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}
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return false;
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}
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/* Multipath route selection:
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* Hash based function using packet header and flowlabel.
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* Adapted from fib_info_hashfn()
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*/
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static int rt6_info_hash_nhsfn(unsigned int candidate_count,
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const struct flowi6 *fl6)
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{
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return get_hash_from_flowi6(fl6) % candidate_count;
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}
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static struct rt6_info *rt6_multipath_select(struct rt6_info *match,
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struct flowi6 *fl6, int oif,
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int strict)
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{
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struct rt6_info *sibling, *next_sibling;
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int route_choosen;
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route_choosen = rt6_info_hash_nhsfn(match->rt6i_nsiblings + 1, fl6);
|
|
/* Don't change the route, if route_choosen == 0
|
|
* (siblings does not include ourself)
|
|
*/
|
|
if (route_choosen)
|
|
list_for_each_entry_safe(sibling, next_sibling,
|
|
&match->rt6i_siblings, rt6i_siblings) {
|
|
route_choosen--;
|
|
if (route_choosen == 0) {
|
|
if (rt6_score_route(sibling, oif, strict) < 0)
|
|
break;
|
|
match = sibling;
|
|
break;
|
|
}
|
|
}
|
|
return match;
|
|
}
|
|
|
|
/*
|
|
* Route lookup. Any table->tb6_lock is implied.
|
|
*/
|
|
|
|
static inline struct rt6_info *rt6_device_match(struct net *net,
|
|
struct rt6_info *rt,
|
|
const struct in6_addr *saddr,
|
|
int oif,
|
|
int flags)
|
|
{
|
|
struct rt6_info *local = NULL;
|
|
struct rt6_info *sprt;
|
|
|
|
if (!oif && ipv6_addr_any(saddr))
|
|
goto out;
|
|
|
|
for (sprt = rt; sprt; sprt = sprt->dst.rt6_next) {
|
|
struct net_device *dev = sprt->dst.dev;
|
|
|
|
if (oif) {
|
|
if (dev->ifindex == oif)
|
|
return sprt;
|
|
if (dev->flags & IFF_LOOPBACK) {
|
|
if (!sprt->rt6i_idev ||
|
|
sprt->rt6i_idev->dev->ifindex != oif) {
|
|
if (flags & RT6_LOOKUP_F_IFACE)
|
|
continue;
|
|
if (local &&
|
|
local->rt6i_idev->dev->ifindex == oif)
|
|
continue;
|
|
}
|
|
local = sprt;
|
|
}
|
|
} else {
|
|
if (ipv6_chk_addr(net, saddr, dev,
|
|
flags & RT6_LOOKUP_F_IFACE))
|
|
return sprt;
|
|
}
|
|
}
|
|
|
|
if (oif) {
|
|
if (local)
|
|
return local;
|
|
|
|
if (flags & RT6_LOOKUP_F_IFACE)
|
|
return net->ipv6.ip6_null_entry;
|
|
}
|
|
out:
|
|
return rt;
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_ROUTER_PREF
|
|
struct __rt6_probe_work {
|
|
struct work_struct work;
|
|
struct in6_addr target;
|
|
struct net_device *dev;
|
|
};
|
|
|
|
static void rt6_probe_deferred(struct work_struct *w)
|
|
{
|
|
struct in6_addr mcaddr;
|
|
struct __rt6_probe_work *work =
|
|
container_of(w, struct __rt6_probe_work, work);
|
|
|
|
addrconf_addr_solict_mult(&work->target, &mcaddr);
|
|
ndisc_send_ns(work->dev, &work->target, &mcaddr, NULL);
|
|
dev_put(work->dev);
|
|
kfree(work);
|
|
}
|
|
|
|
static void rt6_probe(struct rt6_info *rt)
|
|
{
|
|
struct __rt6_probe_work *work;
|
|
struct neighbour *neigh;
|
|
/*
|
|
* Okay, this does not seem to be appropriate
|
|
* for now, however, we need to check if it
|
|
* is really so; aka Router Reachability Probing.
|
|
*
|
|
* Router Reachability Probe MUST be rate-limited
|
|
* to no more than one per minute.
|
|
*/
|
|
if (!rt || !(rt->rt6i_flags & RTF_GATEWAY))
|
|
return;
|
|
rcu_read_lock_bh();
|
|
neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
|
|
if (neigh) {
|
|
if (neigh->nud_state & NUD_VALID)
|
|
goto out;
|
|
|
|
work = NULL;
|
|
write_lock(&neigh->lock);
|
|
if (!(neigh->nud_state & NUD_VALID) &&
|
|
time_after(jiffies,
|
|
neigh->updated +
|
|
rt->rt6i_idev->cnf.rtr_probe_interval)) {
|
|
work = kmalloc(sizeof(*work), GFP_ATOMIC);
|
|
if (work)
|
|
__neigh_set_probe_once(neigh);
|
|
}
|
|
write_unlock(&neigh->lock);
|
|
} else {
|
|
work = kmalloc(sizeof(*work), GFP_ATOMIC);
|
|
}
|
|
|
|
if (work) {
|
|
INIT_WORK(&work->work, rt6_probe_deferred);
|
|
work->target = rt->rt6i_gateway;
|
|
dev_hold(rt->dst.dev);
|
|
work->dev = rt->dst.dev;
|
|
schedule_work(&work->work);
|
|
}
|
|
|
|
out:
|
|
rcu_read_unlock_bh();
|
|
}
|
|
#else
|
|
static inline void rt6_probe(struct rt6_info *rt)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Default Router Selection (RFC 2461 6.3.6)
|
|
*/
|
|
static inline int rt6_check_dev(struct rt6_info *rt, int oif)
|
|
{
|
|
struct net_device *dev = rt->dst.dev;
|
|
if (!oif || dev->ifindex == oif)
|
|
return 2;
|
|
if ((dev->flags & IFF_LOOPBACK) &&
|
|
rt->rt6i_idev && rt->rt6i_idev->dev->ifindex == oif)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static inline enum rt6_nud_state rt6_check_neigh(struct rt6_info *rt)
|
|
{
|
|
struct neighbour *neigh;
|
|
enum rt6_nud_state ret = RT6_NUD_FAIL_HARD;
|
|
|
|
if (rt->rt6i_flags & RTF_NONEXTHOP ||
|
|
!(rt->rt6i_flags & RTF_GATEWAY))
|
|
return RT6_NUD_SUCCEED;
|
|
|
|
rcu_read_lock_bh();
|
|
neigh = __ipv6_neigh_lookup_noref(rt->dst.dev, &rt->rt6i_gateway);
|
|
if (neigh) {
|
|
read_lock(&neigh->lock);
|
|
if (neigh->nud_state & NUD_VALID)
|
|
ret = RT6_NUD_SUCCEED;
|
|
#ifdef CONFIG_IPV6_ROUTER_PREF
|
|
else if (!(neigh->nud_state & NUD_FAILED))
|
|
ret = RT6_NUD_SUCCEED;
|
|
else
|
|
ret = RT6_NUD_FAIL_PROBE;
|
|
#endif
|
|
read_unlock(&neigh->lock);
|
|
} else {
|
|
ret = IS_ENABLED(CONFIG_IPV6_ROUTER_PREF) ?
|
|
RT6_NUD_SUCCEED : RT6_NUD_FAIL_DO_RR;
|
|
}
|
|
rcu_read_unlock_bh();
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int rt6_score_route(struct rt6_info *rt, int oif,
|
|
int strict)
|
|
{
|
|
int m;
|
|
|
|
m = rt6_check_dev(rt, oif);
|
|
if (!m && (strict & RT6_LOOKUP_F_IFACE))
|
|
return RT6_NUD_FAIL_HARD;
|
|
#ifdef CONFIG_IPV6_ROUTER_PREF
|
|
m |= IPV6_DECODE_PREF(IPV6_EXTRACT_PREF(rt->rt6i_flags)) << 2;
|
|
#endif
|
|
if (strict & RT6_LOOKUP_F_REACHABLE) {
|
|
int n = rt6_check_neigh(rt);
|
|
if (n < 0)
|
|
return n;
|
|
}
|
|
return m;
|
|
}
|
|
|
|
static struct rt6_info *find_match(struct rt6_info *rt, int oif, int strict,
|
|
int *mpri, struct rt6_info *match,
|
|
bool *do_rr)
|
|
{
|
|
int m;
|
|
bool match_do_rr = false;
|
|
struct inet6_dev *idev = rt->rt6i_idev;
|
|
struct net_device *dev = rt->dst.dev;
|
|
|
|
if (dev && !netif_carrier_ok(dev) &&
|
|
idev->cnf.ignore_routes_with_linkdown &&
|
|
!(strict & RT6_LOOKUP_F_IGNORE_LINKSTATE))
|
|
goto out;
|
|
|
|
if (rt6_check_expired(rt))
|
|
goto out;
|
|
|
|
m = rt6_score_route(rt, oif, strict);
|
|
if (m == RT6_NUD_FAIL_DO_RR) {
|
|
match_do_rr = true;
|
|
m = 0; /* lowest valid score */
|
|
} else if (m == RT6_NUD_FAIL_HARD) {
|
|
goto out;
|
|
}
|
|
|
|
if (strict & RT6_LOOKUP_F_REACHABLE)
|
|
rt6_probe(rt);
|
|
|
|
/* note that m can be RT6_NUD_FAIL_PROBE at this point */
|
|
if (m > *mpri) {
|
|
*do_rr = match_do_rr;
|
|
*mpri = m;
|
|
match = rt;
|
|
}
|
|
out:
|
|
return match;
|
|
}
|
|
|
|
static struct rt6_info *find_rr_leaf(struct fib6_node *fn,
|
|
struct rt6_info *rr_head,
|
|
u32 metric, int oif, int strict,
|
|
bool *do_rr)
|
|
{
|
|
struct rt6_info *rt, *match, *cont;
|
|
int mpri = -1;
|
|
|
|
match = NULL;
|
|
cont = NULL;
|
|
for (rt = rr_head; rt; rt = rt->dst.rt6_next) {
|
|
if (rt->rt6i_metric != metric) {
|
|
cont = rt;
|
|
break;
|
|
}
|
|
|
|
match = find_match(rt, oif, strict, &mpri, match, do_rr);
|
|
}
|
|
|
|
for (rt = fn->leaf; rt && rt != rr_head; rt = rt->dst.rt6_next) {
|
|
if (rt->rt6i_metric != metric) {
|
|
cont = rt;
|
|
break;
|
|
}
|
|
|
|
match = find_match(rt, oif, strict, &mpri, match, do_rr);
|
|
}
|
|
|
|
if (match || !cont)
|
|
return match;
|
|
|
|
for (rt = cont; rt; rt = rt->dst.rt6_next)
|
|
match = find_match(rt, oif, strict, &mpri, match, do_rr);
|
|
|
|
return match;
|
|
}
|
|
|
|
static struct rt6_info *rt6_select(struct fib6_node *fn, int oif, int strict)
|
|
{
|
|
struct rt6_info *match, *rt0;
|
|
struct net *net;
|
|
bool do_rr = false;
|
|
|
|
rt0 = fn->rr_ptr;
|
|
if (!rt0)
|
|
fn->rr_ptr = rt0 = fn->leaf;
|
|
|
|
match = find_rr_leaf(fn, rt0, rt0->rt6i_metric, oif, strict,
|
|
&do_rr);
|
|
|
|
if (do_rr) {
|
|
struct rt6_info *next = rt0->dst.rt6_next;
|
|
|
|
/* no entries matched; do round-robin */
|
|
if (!next || next->rt6i_metric != rt0->rt6i_metric)
|
|
next = fn->leaf;
|
|
|
|
if (next != rt0)
|
|
fn->rr_ptr = next;
|
|
}
|
|
|
|
net = dev_net(rt0->dst.dev);
|
|
return match ? match : net->ipv6.ip6_null_entry;
|
|
}
|
|
|
|
static bool rt6_is_gw_or_nonexthop(const struct rt6_info *rt)
|
|
{
|
|
return (rt->rt6i_flags & (RTF_NONEXTHOP | RTF_GATEWAY));
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_ROUTE_INFO
|
|
int rt6_route_rcv(struct net_device *dev, u8 *opt, int len,
|
|
const struct in6_addr *gwaddr)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct route_info *rinfo = (struct route_info *) opt;
|
|
struct in6_addr prefix_buf, *prefix;
|
|
unsigned int pref;
|
|
unsigned long lifetime;
|
|
struct rt6_info *rt;
|
|
|
|
if (len < sizeof(struct route_info)) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
/* Sanity check for prefix_len and length */
|
|
if (rinfo->length > 3) {
|
|
return -EINVAL;
|
|
} else if (rinfo->prefix_len > 128) {
|
|
return -EINVAL;
|
|
} else if (rinfo->prefix_len > 64) {
|
|
if (rinfo->length < 2) {
|
|
return -EINVAL;
|
|
}
|
|
} else if (rinfo->prefix_len > 0) {
|
|
if (rinfo->length < 1) {
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
pref = rinfo->route_pref;
|
|
if (pref == ICMPV6_ROUTER_PREF_INVALID)
|
|
return -EINVAL;
|
|
|
|
lifetime = addrconf_timeout_fixup(ntohl(rinfo->lifetime), HZ);
|
|
|
|
if (rinfo->length == 3)
|
|
prefix = (struct in6_addr *)rinfo->prefix;
|
|
else {
|
|
/* this function is safe */
|
|
ipv6_addr_prefix(&prefix_buf,
|
|
(struct in6_addr *)rinfo->prefix,
|
|
rinfo->prefix_len);
|
|
prefix = &prefix_buf;
|
|
}
|
|
|
|
if (rinfo->prefix_len == 0)
|
|
rt = rt6_get_dflt_router(gwaddr, dev);
|
|
else
|
|
rt = rt6_get_route_info(net, prefix, rinfo->prefix_len,
|
|
gwaddr, dev);
|
|
|
|
if (rt && !lifetime) {
|
|
ip6_del_rt(rt);
|
|
rt = NULL;
|
|
}
|
|
|
|
if (!rt && lifetime)
|
|
rt = rt6_add_route_info(net, prefix, rinfo->prefix_len, gwaddr,
|
|
dev, pref);
|
|
else if (rt)
|
|
rt->rt6i_flags = RTF_ROUTEINFO |
|
|
(rt->rt6i_flags & ~RTF_PREF_MASK) | RTF_PREF(pref);
|
|
|
|
if (rt) {
|
|
if (!addrconf_finite_timeout(lifetime))
|
|
rt6_clean_expires(rt);
|
|
else
|
|
rt6_set_expires(rt, jiffies + HZ * lifetime);
|
|
|
|
ip6_rt_put(rt);
|
|
}
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static struct fib6_node* fib6_backtrack(struct fib6_node *fn,
|
|
struct in6_addr *saddr)
|
|
{
|
|
struct fib6_node *pn;
|
|
while (1) {
|
|
if (fn->fn_flags & RTN_TL_ROOT)
|
|
return NULL;
|
|
pn = fn->parent;
|
|
if (FIB6_SUBTREE(pn) && FIB6_SUBTREE(pn) != fn)
|
|
fn = fib6_lookup(FIB6_SUBTREE(pn), NULL, saddr);
|
|
else
|
|
fn = pn;
|
|
if (fn->fn_flags & RTN_RTINFO)
|
|
return fn;
|
|
}
|
|
}
|
|
|
|
static struct rt6_info *ip6_pol_route_lookup(struct net *net,
|
|
struct fib6_table *table,
|
|
struct flowi6 *fl6, int flags)
|
|
{
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt;
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
|
|
restart:
|
|
rt = fn->leaf;
|
|
rt = rt6_device_match(net, rt, &fl6->saddr, fl6->flowi6_oif, flags);
|
|
if (rt->rt6i_nsiblings && fl6->flowi6_oif == 0)
|
|
rt = rt6_multipath_select(rt, fl6, fl6->flowi6_oif, flags);
|
|
if (rt == net->ipv6.ip6_null_entry) {
|
|
fn = fib6_backtrack(fn, &fl6->saddr);
|
|
if (fn)
|
|
goto restart;
|
|
}
|
|
dst_use(&rt->dst, jiffies);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
|
|
|
|
return rt;
|
|
|
|
}
|
|
|
|
struct dst_entry *ip6_route_lookup(struct net *net, struct flowi6 *fl6,
|
|
int flags)
|
|
{
|
|
return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_lookup);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_route_lookup);
|
|
|
|
struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr, int oif, int strict)
|
|
{
|
|
struct flowi6 fl6 = {
|
|
.flowi6_oif = oif,
|
|
.daddr = *daddr,
|
|
};
|
|
struct dst_entry *dst;
|
|
int flags = strict ? RT6_LOOKUP_F_IFACE : 0;
|
|
|
|
if (saddr) {
|
|
memcpy(&fl6.saddr, saddr, sizeof(*saddr));
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
}
|
|
|
|
dst = fib6_rule_lookup(net, &fl6, flags, ip6_pol_route_lookup);
|
|
if (dst->error == 0)
|
|
return (struct rt6_info *) dst;
|
|
|
|
dst_release(dst);
|
|
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL(rt6_lookup);
|
|
|
|
/* ip6_ins_rt is called with FREE table->tb6_lock.
|
|
It takes new route entry, the addition fails by any reason the
|
|
route is freed. In any case, if caller does not hold it, it may
|
|
be destroyed.
|
|
*/
|
|
|
|
static int __ip6_ins_rt(struct rt6_info *rt, struct nl_info *info,
|
|
struct mx6_config *mxc)
|
|
{
|
|
int err;
|
|
struct fib6_table *table;
|
|
|
|
table = rt->rt6i_table;
|
|
write_lock_bh(&table->tb6_lock);
|
|
err = fib6_add(&table->tb6_root, rt, info, mxc);
|
|
write_unlock_bh(&table->tb6_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
int ip6_ins_rt(struct rt6_info *rt)
|
|
{
|
|
struct nl_info info = { .nl_net = dev_net(rt->dst.dev), };
|
|
struct mx6_config mxc = { .mx = NULL, };
|
|
|
|
return __ip6_ins_rt(rt, &info, &mxc);
|
|
}
|
|
|
|
static struct rt6_info *ip6_rt_cache_alloc(struct rt6_info *ort,
|
|
const struct in6_addr *daddr,
|
|
const struct in6_addr *saddr)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
/*
|
|
* Clone the route.
|
|
*/
|
|
|
|
if (ort->rt6i_flags & (RTF_CACHE | RTF_PCPU))
|
|
ort = (struct rt6_info *)ort->dst.from;
|
|
|
|
rt = __ip6_dst_alloc(dev_net(ort->dst.dev), ort->dst.dev, 0);
|
|
|
|
if (!rt)
|
|
return NULL;
|
|
|
|
ip6_rt_copy_init(rt, ort);
|
|
rt->rt6i_flags |= RTF_CACHE;
|
|
rt->rt6i_metric = 0;
|
|
rt->dst.flags |= DST_HOST;
|
|
rt->rt6i_dst.addr = *daddr;
|
|
rt->rt6i_dst.plen = 128;
|
|
|
|
if (!rt6_is_gw_or_nonexthop(ort)) {
|
|
if (ort->rt6i_dst.plen != 128 &&
|
|
ipv6_addr_equal(&ort->rt6i_dst.addr, daddr))
|
|
rt->rt6i_flags |= RTF_ANYCAST;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (rt->rt6i_src.plen && saddr) {
|
|
rt->rt6i_src.addr = *saddr;
|
|
rt->rt6i_src.plen = 128;
|
|
}
|
|
#endif
|
|
}
|
|
|
|
return rt;
|
|
}
|
|
|
|
static struct rt6_info *ip6_rt_pcpu_alloc(struct rt6_info *rt)
|
|
{
|
|
struct rt6_info *pcpu_rt;
|
|
|
|
pcpu_rt = __ip6_dst_alloc(dev_net(rt->dst.dev),
|
|
rt->dst.dev, rt->dst.flags);
|
|
|
|
if (!pcpu_rt)
|
|
return NULL;
|
|
ip6_rt_copy_init(pcpu_rt, rt);
|
|
pcpu_rt->rt6i_protocol = rt->rt6i_protocol;
|
|
pcpu_rt->rt6i_flags |= RTF_PCPU;
|
|
return pcpu_rt;
|
|
}
|
|
|
|
/* It should be called with read_lock_bh(&tb6_lock) acquired */
|
|
static struct rt6_info *rt6_get_pcpu_route(struct rt6_info *rt)
|
|
{
|
|
struct rt6_info *pcpu_rt, **p;
|
|
|
|
p = this_cpu_ptr(rt->rt6i_pcpu);
|
|
pcpu_rt = *p;
|
|
|
|
if (pcpu_rt) {
|
|
dst_hold(&pcpu_rt->dst);
|
|
rt6_dst_from_metrics_check(pcpu_rt);
|
|
}
|
|
return pcpu_rt;
|
|
}
|
|
|
|
static struct rt6_info *rt6_make_pcpu_route(struct rt6_info *rt)
|
|
{
|
|
struct fib6_table *table = rt->rt6i_table;
|
|
struct rt6_info *pcpu_rt, *prev, **p;
|
|
|
|
pcpu_rt = ip6_rt_pcpu_alloc(rt);
|
|
if (!pcpu_rt) {
|
|
struct net *net = dev_net(rt->dst.dev);
|
|
|
|
dst_hold(&net->ipv6.ip6_null_entry->dst);
|
|
return net->ipv6.ip6_null_entry;
|
|
}
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
if (rt->rt6i_pcpu) {
|
|
p = this_cpu_ptr(rt->rt6i_pcpu);
|
|
prev = cmpxchg(p, NULL, pcpu_rt);
|
|
if (prev) {
|
|
/* If someone did it before us, return prev instead */
|
|
dst_destroy(&pcpu_rt->dst);
|
|
pcpu_rt = prev;
|
|
}
|
|
} else {
|
|
/* rt has been removed from the fib6 tree
|
|
* before we have a chance to acquire the read_lock.
|
|
* In this case, don't brother to create a pcpu rt
|
|
* since rt is going away anyway. The next
|
|
* dst_check() will trigger a re-lookup.
|
|
*/
|
|
dst_destroy(&pcpu_rt->dst);
|
|
pcpu_rt = rt;
|
|
}
|
|
dst_hold(&pcpu_rt->dst);
|
|
rt6_dst_from_metrics_check(pcpu_rt);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
return pcpu_rt;
|
|
}
|
|
|
|
struct rt6_info *ip6_pol_route(struct net *net, struct fib6_table *table,
|
|
int oif, struct flowi6 *fl6, int flags)
|
|
{
|
|
struct fib6_node *fn, *saved_fn;
|
|
struct rt6_info *rt;
|
|
int strict = 0;
|
|
|
|
strict |= flags & RT6_LOOKUP_F_IFACE;
|
|
strict |= flags & RT6_LOOKUP_F_IGNORE_LINKSTATE;
|
|
if (net->ipv6.devconf_all->forwarding == 0)
|
|
strict |= RT6_LOOKUP_F_REACHABLE;
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
|
|
fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
|
|
saved_fn = fn;
|
|
|
|
if (fl6->flowi6_flags & FLOWI_FLAG_SKIP_NH_OIF)
|
|
oif = 0;
|
|
|
|
redo_rt6_select:
|
|
rt = rt6_select(fn, oif, strict);
|
|
if (rt->rt6i_nsiblings)
|
|
rt = rt6_multipath_select(rt, fl6, oif, strict);
|
|
if (rt == net->ipv6.ip6_null_entry) {
|
|
fn = fib6_backtrack(fn, &fl6->saddr);
|
|
if (fn)
|
|
goto redo_rt6_select;
|
|
else if (strict & RT6_LOOKUP_F_REACHABLE) {
|
|
/* also consider unreachable route */
|
|
strict &= ~RT6_LOOKUP_F_REACHABLE;
|
|
fn = saved_fn;
|
|
goto redo_rt6_select;
|
|
}
|
|
}
|
|
|
|
|
|
if (rt == net->ipv6.ip6_null_entry || (rt->rt6i_flags & RTF_CACHE)) {
|
|
dst_use(&rt->dst, jiffies);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
rt6_dst_from_metrics_check(rt);
|
|
|
|
trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
|
|
return rt;
|
|
} else if (unlikely((fl6->flowi6_flags & FLOWI_FLAG_KNOWN_NH) &&
|
|
!(rt->rt6i_flags & RTF_GATEWAY))) {
|
|
/* Create a RTF_CACHE clone which will not be
|
|
* owned by the fib6 tree. It is for the special case where
|
|
* the daddr in the skb during the neighbor look-up is different
|
|
* from the fl6->daddr used to look-up route here.
|
|
*/
|
|
|
|
struct rt6_info *uncached_rt;
|
|
|
|
dst_use(&rt->dst, jiffies);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
uncached_rt = ip6_rt_cache_alloc(rt, &fl6->daddr, NULL);
|
|
dst_release(&rt->dst);
|
|
|
|
if (uncached_rt)
|
|
rt6_uncached_list_add(uncached_rt);
|
|
else
|
|
uncached_rt = net->ipv6.ip6_null_entry;
|
|
|
|
dst_hold(&uncached_rt->dst);
|
|
|
|
trace_fib6_table_lookup(net, uncached_rt, table->tb6_id, fl6);
|
|
return uncached_rt;
|
|
|
|
} else {
|
|
/* Get a percpu copy */
|
|
|
|
struct rt6_info *pcpu_rt;
|
|
|
|
rt->dst.lastuse = jiffies;
|
|
rt->dst.__use++;
|
|
pcpu_rt = rt6_get_pcpu_route(rt);
|
|
|
|
if (pcpu_rt) {
|
|
read_unlock_bh(&table->tb6_lock);
|
|
} else {
|
|
/* We have to do the read_unlock first
|
|
* because rt6_make_pcpu_route() may trigger
|
|
* ip6_dst_gc() which will take the write_lock.
|
|
*/
|
|
dst_hold(&rt->dst);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
pcpu_rt = rt6_make_pcpu_route(rt);
|
|
dst_release(&rt->dst);
|
|
}
|
|
|
|
trace_fib6_table_lookup(net, pcpu_rt, table->tb6_id, fl6);
|
|
return pcpu_rt;
|
|
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_pol_route);
|
|
|
|
static struct rt6_info *ip6_pol_route_input(struct net *net, struct fib6_table *table,
|
|
struct flowi6 *fl6, int flags)
|
|
{
|
|
return ip6_pol_route(net, table, fl6->flowi6_iif, fl6, flags);
|
|
}
|
|
|
|
struct dst_entry *ip6_route_input_lookup(struct net *net,
|
|
struct net_device *dev,
|
|
struct flowi6 *fl6, int flags)
|
|
{
|
|
if (rt6_need_strict(&fl6->daddr) && dev->type != ARPHRD_PIMREG)
|
|
flags |= RT6_LOOKUP_F_IFACE;
|
|
|
|
return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_input);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_route_input_lookup);
|
|
|
|
void ip6_route_input(struct sk_buff *skb)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
struct net *net = dev_net(skb->dev);
|
|
int flags = RT6_LOOKUP_F_HAS_SADDR;
|
|
struct ip_tunnel_info *tun_info;
|
|
struct flowi6 fl6 = {
|
|
.flowi6_iif = skb->dev->ifindex,
|
|
.daddr = iph->daddr,
|
|
.saddr = iph->saddr,
|
|
.flowlabel = ip6_flowinfo(iph),
|
|
.flowi6_mark = skb->mark,
|
|
.flowi6_proto = iph->nexthdr,
|
|
};
|
|
|
|
tun_info = skb_tunnel_info(skb);
|
|
if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX))
|
|
fl6.flowi6_tun_key.tun_id = tun_info->key.tun_id;
|
|
skb_dst_drop(skb);
|
|
skb_dst_set(skb, ip6_route_input_lookup(net, skb->dev, &fl6, flags));
|
|
}
|
|
|
|
static struct rt6_info *ip6_pol_route_output(struct net *net, struct fib6_table *table,
|
|
struct flowi6 *fl6, int flags)
|
|
{
|
|
return ip6_pol_route(net, table, fl6->flowi6_oif, fl6, flags);
|
|
}
|
|
|
|
struct dst_entry *ip6_route_output_flags(struct net *net, const struct sock *sk,
|
|
struct flowi6 *fl6, int flags)
|
|
{
|
|
bool any_src;
|
|
|
|
if (rt6_need_strict(&fl6->daddr)) {
|
|
struct dst_entry *dst;
|
|
|
|
dst = l3mdev_link_scope_lookup(net, fl6);
|
|
if (dst)
|
|
return dst;
|
|
}
|
|
|
|
fl6->flowi6_iif = LOOPBACK_IFINDEX;
|
|
|
|
any_src = ipv6_addr_any(&fl6->saddr);
|
|
if ((sk && sk->sk_bound_dev_if) || rt6_need_strict(&fl6->daddr) ||
|
|
(fl6->flowi6_oif && any_src))
|
|
flags |= RT6_LOOKUP_F_IFACE;
|
|
|
|
if (!any_src)
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
else if (sk)
|
|
flags |= rt6_srcprefs2flags(inet6_sk(sk)->srcprefs);
|
|
|
|
return fib6_rule_lookup(net, fl6, flags, ip6_pol_route_output);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_route_output_flags);
|
|
|
|
struct dst_entry *ip6_blackhole_route(struct net *net, struct dst_entry *dst_orig)
|
|
{
|
|
struct rt6_info *rt, *ort = (struct rt6_info *) dst_orig;
|
|
struct dst_entry *new = NULL;
|
|
|
|
rt = dst_alloc(&ip6_dst_blackhole_ops, ort->dst.dev, 1, DST_OBSOLETE_NONE, 0);
|
|
if (rt) {
|
|
rt6_info_init(rt);
|
|
|
|
new = &rt->dst;
|
|
new->__use = 1;
|
|
new->input = dst_discard;
|
|
new->output = dst_discard_out;
|
|
|
|
dst_copy_metrics(new, &ort->dst);
|
|
rt->rt6i_idev = ort->rt6i_idev;
|
|
if (rt->rt6i_idev)
|
|
in6_dev_hold(rt->rt6i_idev);
|
|
|
|
rt->rt6i_gateway = ort->rt6i_gateway;
|
|
rt->rt6i_flags = ort->rt6i_flags & ~RTF_PCPU;
|
|
rt->rt6i_metric = 0;
|
|
|
|
memcpy(&rt->rt6i_dst, &ort->rt6i_dst, sizeof(struct rt6key));
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
memcpy(&rt->rt6i_src, &ort->rt6i_src, sizeof(struct rt6key));
|
|
#endif
|
|
|
|
dst_free(new);
|
|
}
|
|
|
|
dst_release(dst_orig);
|
|
return new ? new : ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* Destination cache support functions
|
|
*/
|
|
|
|
static void rt6_dst_from_metrics_check(struct rt6_info *rt)
|
|
{
|
|
if (rt->dst.from &&
|
|
dst_metrics_ptr(&rt->dst) != dst_metrics_ptr(rt->dst.from))
|
|
dst_init_metrics(&rt->dst, dst_metrics_ptr(rt->dst.from), true);
|
|
}
|
|
|
|
static struct dst_entry *rt6_check(struct rt6_info *rt, u32 cookie)
|
|
{
|
|
if (!rt->rt6i_node || (rt->rt6i_node->fn_sernum != cookie))
|
|
return NULL;
|
|
|
|
if (rt6_check_expired(rt))
|
|
return NULL;
|
|
|
|
return &rt->dst;
|
|
}
|
|
|
|
static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
|
|
{
|
|
if (!__rt6_check_expired(rt) &&
|
|
rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
|
|
rt6_check((struct rt6_info *)(rt->dst.from), cookie))
|
|
return &rt->dst;
|
|
else
|
|
return NULL;
|
|
}
|
|
|
|
static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
rt = (struct rt6_info *) dst;
|
|
|
|
/* All IPV6 dsts are created with ->obsolete set to the value
|
|
* DST_OBSOLETE_FORCE_CHK which forces validation calls down
|
|
* into this function always.
|
|
*/
|
|
|
|
rt6_dst_from_metrics_check(rt);
|
|
|
|
if (rt->rt6i_flags & RTF_PCPU ||
|
|
(unlikely(dst->flags & DST_NOCACHE) && rt->dst.from))
|
|
return rt6_dst_from_check(rt, cookie);
|
|
else
|
|
return rt6_check(rt, cookie);
|
|
}
|
|
|
|
static struct dst_entry *ip6_negative_advice(struct dst_entry *dst)
|
|
{
|
|
struct rt6_info *rt = (struct rt6_info *) dst;
|
|
|
|
if (rt) {
|
|
if (rt->rt6i_flags & RTF_CACHE) {
|
|
if (rt6_check_expired(rt)) {
|
|
ip6_del_rt(rt);
|
|
dst = NULL;
|
|
}
|
|
} else {
|
|
dst_release(dst);
|
|
dst = NULL;
|
|
}
|
|
}
|
|
return dst;
|
|
}
|
|
|
|
static void ip6_link_failure(struct sk_buff *skb)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0);
|
|
|
|
rt = (struct rt6_info *) skb_dst(skb);
|
|
if (rt) {
|
|
if (rt->rt6i_flags & RTF_CACHE) {
|
|
dst_hold(&rt->dst);
|
|
ip6_del_rt(rt);
|
|
} else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT)) {
|
|
rt->rt6i_node->fn_sernum = -1;
|
|
}
|
|
}
|
|
}
|
|
|
|
static void rt6_do_update_pmtu(struct rt6_info *rt, u32 mtu)
|
|
{
|
|
struct net *net = dev_net(rt->dst.dev);
|
|
|
|
rt->rt6i_flags |= RTF_MODIFIED;
|
|
rt->rt6i_pmtu = mtu;
|
|
rt6_update_expires(rt, net->ipv6.sysctl.ip6_rt_mtu_expires);
|
|
}
|
|
|
|
static bool rt6_cache_allowed_for_pmtu(const struct rt6_info *rt)
|
|
{
|
|
return !(rt->rt6i_flags & RTF_CACHE) &&
|
|
(rt->rt6i_flags & RTF_PCPU || rt->rt6i_node);
|
|
}
|
|
|
|
static void __ip6_rt_update_pmtu(struct dst_entry *dst, const struct sock *sk,
|
|
const struct ipv6hdr *iph, u32 mtu)
|
|
{
|
|
struct rt6_info *rt6 = (struct rt6_info *)dst;
|
|
|
|
if (rt6->rt6i_flags & RTF_LOCAL)
|
|
return;
|
|
|
|
if (dst_metric_locked(dst, RTAX_MTU))
|
|
return;
|
|
|
|
dst_confirm(dst);
|
|
mtu = max_t(u32, mtu, IPV6_MIN_MTU);
|
|
if (mtu >= dst_mtu(dst))
|
|
return;
|
|
|
|
if (!rt6_cache_allowed_for_pmtu(rt6)) {
|
|
rt6_do_update_pmtu(rt6, mtu);
|
|
} else {
|
|
const struct in6_addr *daddr, *saddr;
|
|
struct rt6_info *nrt6;
|
|
|
|
if (iph) {
|
|
daddr = &iph->daddr;
|
|
saddr = &iph->saddr;
|
|
} else if (sk) {
|
|
daddr = &sk->sk_v6_daddr;
|
|
saddr = &inet6_sk(sk)->saddr;
|
|
} else {
|
|
return;
|
|
}
|
|
nrt6 = ip6_rt_cache_alloc(rt6, daddr, saddr);
|
|
if (nrt6) {
|
|
rt6_do_update_pmtu(nrt6, mtu);
|
|
|
|
/* ip6_ins_rt(nrt6) will bump the
|
|
* rt6->rt6i_node->fn_sernum
|
|
* which will fail the next rt6_check() and
|
|
* invalidate the sk->sk_dst_cache.
|
|
*/
|
|
ip6_ins_rt(nrt6);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void ip6_rt_update_pmtu(struct dst_entry *dst, struct sock *sk,
|
|
struct sk_buff *skb, u32 mtu)
|
|
{
|
|
__ip6_rt_update_pmtu(dst, sk, skb ? ipv6_hdr(skb) : NULL, mtu);
|
|
}
|
|
|
|
void ip6_update_pmtu(struct sk_buff *skb, struct net *net, __be32 mtu,
|
|
int oif, u32 mark)
|
|
{
|
|
const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
|
|
struct dst_entry *dst;
|
|
struct flowi6 fl6;
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
fl6.flowi6_oif = oif;
|
|
fl6.flowi6_mark = mark ? mark : IP6_REPLY_MARK(net, skb->mark);
|
|
fl6.daddr = iph->daddr;
|
|
fl6.saddr = iph->saddr;
|
|
fl6.flowlabel = ip6_flowinfo(iph);
|
|
|
|
dst = ip6_route_output(net, NULL, &fl6);
|
|
if (!dst->error)
|
|
__ip6_rt_update_pmtu(dst, NULL, iph, ntohl(mtu));
|
|
dst_release(dst);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_update_pmtu);
|
|
|
|
void ip6_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, __be32 mtu)
|
|
{
|
|
struct dst_entry *dst;
|
|
|
|
ip6_update_pmtu(skb, sock_net(sk), mtu,
|
|
sk->sk_bound_dev_if, sk->sk_mark);
|
|
|
|
dst = __sk_dst_get(sk);
|
|
if (!dst || !dst->obsolete ||
|
|
dst->ops->check(dst, inet6_sk(sk)->dst_cookie))
|
|
return;
|
|
|
|
bh_lock_sock(sk);
|
|
if (!sock_owned_by_user(sk) && !ipv6_addr_v4mapped(&sk->sk_v6_daddr))
|
|
ip6_datagram_dst_update(sk, false);
|
|
bh_unlock_sock(sk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_sk_update_pmtu);
|
|
|
|
/* Handle redirects */
|
|
struct ip6rd_flowi {
|
|
struct flowi6 fl6;
|
|
struct in6_addr gateway;
|
|
};
|
|
|
|
static struct rt6_info *__ip6_route_redirect(struct net *net,
|
|
struct fib6_table *table,
|
|
struct flowi6 *fl6,
|
|
int flags)
|
|
{
|
|
struct ip6rd_flowi *rdfl = (struct ip6rd_flowi *)fl6;
|
|
struct rt6_info *rt;
|
|
struct fib6_node *fn;
|
|
|
|
/* Get the "current" route for this destination and
|
|
* check if the redirect has come from approriate router.
|
|
*
|
|
* RFC 4861 specifies that redirects should only be
|
|
* accepted if they come from the nexthop to the target.
|
|
* Due to the way the routes are chosen, this notion
|
|
* is a bit fuzzy and one might need to check all possible
|
|
* routes.
|
|
*/
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
fn = fib6_lookup(&table->tb6_root, &fl6->daddr, &fl6->saddr);
|
|
restart:
|
|
for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
|
|
if (rt6_check_expired(rt))
|
|
continue;
|
|
if (rt->dst.error)
|
|
break;
|
|
if (!(rt->rt6i_flags & RTF_GATEWAY))
|
|
continue;
|
|
if (fl6->flowi6_oif != rt->dst.dev->ifindex)
|
|
continue;
|
|
if (!ipv6_addr_equal(&rdfl->gateway, &rt->rt6i_gateway))
|
|
continue;
|
|
break;
|
|
}
|
|
|
|
if (!rt)
|
|
rt = net->ipv6.ip6_null_entry;
|
|
else if (rt->dst.error) {
|
|
rt = net->ipv6.ip6_null_entry;
|
|
goto out;
|
|
}
|
|
|
|
if (rt == net->ipv6.ip6_null_entry) {
|
|
fn = fib6_backtrack(fn, &fl6->saddr);
|
|
if (fn)
|
|
goto restart;
|
|
}
|
|
|
|
out:
|
|
dst_hold(&rt->dst);
|
|
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
trace_fib6_table_lookup(net, rt, table->tb6_id, fl6);
|
|
return rt;
|
|
};
|
|
|
|
static struct dst_entry *ip6_route_redirect(struct net *net,
|
|
const struct flowi6 *fl6,
|
|
const struct in6_addr *gateway)
|
|
{
|
|
int flags = RT6_LOOKUP_F_HAS_SADDR;
|
|
struct ip6rd_flowi rdfl;
|
|
|
|
rdfl.fl6 = *fl6;
|
|
rdfl.gateway = *gateway;
|
|
|
|
return fib6_rule_lookup(net, &rdfl.fl6,
|
|
flags, __ip6_route_redirect);
|
|
}
|
|
|
|
void ip6_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark)
|
|
{
|
|
const struct ipv6hdr *iph = (struct ipv6hdr *) skb->data;
|
|
struct dst_entry *dst;
|
|
struct flowi6 fl6;
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
fl6.flowi6_iif = LOOPBACK_IFINDEX;
|
|
fl6.flowi6_oif = oif;
|
|
fl6.flowi6_mark = mark;
|
|
fl6.daddr = iph->daddr;
|
|
fl6.saddr = iph->saddr;
|
|
fl6.flowlabel = ip6_flowinfo(iph);
|
|
|
|
dst = ip6_route_redirect(net, &fl6, &ipv6_hdr(skb)->saddr);
|
|
rt6_do_redirect(dst, NULL, skb);
|
|
dst_release(dst);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_redirect);
|
|
|
|
void ip6_redirect_no_header(struct sk_buff *skb, struct net *net, int oif,
|
|
u32 mark)
|
|
{
|
|
const struct ipv6hdr *iph = ipv6_hdr(skb);
|
|
const struct rd_msg *msg = (struct rd_msg *)icmp6_hdr(skb);
|
|
struct dst_entry *dst;
|
|
struct flowi6 fl6;
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
fl6.flowi6_iif = LOOPBACK_IFINDEX;
|
|
fl6.flowi6_oif = oif;
|
|
fl6.flowi6_mark = mark;
|
|
fl6.daddr = msg->dest;
|
|
fl6.saddr = iph->daddr;
|
|
|
|
dst = ip6_route_redirect(net, &fl6, &iph->saddr);
|
|
rt6_do_redirect(dst, NULL, skb);
|
|
dst_release(dst);
|
|
}
|
|
|
|
void ip6_sk_redirect(struct sk_buff *skb, struct sock *sk)
|
|
{
|
|
ip6_redirect(skb, sock_net(sk), sk->sk_bound_dev_if, sk->sk_mark);
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_sk_redirect);
|
|
|
|
static unsigned int ip6_default_advmss(const struct dst_entry *dst)
|
|
{
|
|
struct net_device *dev = dst->dev;
|
|
unsigned int mtu = dst_mtu(dst);
|
|
struct net *net = dev_net(dev);
|
|
|
|
mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
|
|
|
|
if (mtu < net->ipv6.sysctl.ip6_rt_min_advmss)
|
|
mtu = net->ipv6.sysctl.ip6_rt_min_advmss;
|
|
|
|
/*
|
|
* Maximal non-jumbo IPv6 payload is IPV6_MAXPLEN and
|
|
* corresponding MSS is IPV6_MAXPLEN - tcp_header_size.
|
|
* IPV6_MAXPLEN is also valid and means: "any MSS,
|
|
* rely only on pmtu discovery"
|
|
*/
|
|
if (mtu > IPV6_MAXPLEN - sizeof(struct tcphdr))
|
|
mtu = IPV6_MAXPLEN;
|
|
return mtu;
|
|
}
|
|
|
|
static unsigned int ip6_mtu(const struct dst_entry *dst)
|
|
{
|
|
const struct rt6_info *rt = (const struct rt6_info *)dst;
|
|
unsigned int mtu = rt->rt6i_pmtu;
|
|
struct inet6_dev *idev;
|
|
|
|
if (mtu)
|
|
goto out;
|
|
|
|
mtu = dst_metric_raw(dst, RTAX_MTU);
|
|
if (mtu)
|
|
goto out;
|
|
|
|
mtu = IPV6_MIN_MTU;
|
|
|
|
rcu_read_lock();
|
|
idev = __in6_dev_get(dst->dev);
|
|
if (idev)
|
|
mtu = idev->cnf.mtu6;
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
|
|
|
|
return mtu - lwtunnel_headroom(dst->lwtstate, mtu);
|
|
}
|
|
|
|
static struct dst_entry *icmp6_dst_gc_list;
|
|
static DEFINE_SPINLOCK(icmp6_dst_lock);
|
|
|
|
struct dst_entry *icmp6_dst_alloc(struct net_device *dev,
|
|
struct flowi6 *fl6)
|
|
{
|
|
struct dst_entry *dst;
|
|
struct rt6_info *rt;
|
|
struct inet6_dev *idev = in6_dev_get(dev);
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (unlikely(!idev))
|
|
return ERR_PTR(-ENODEV);
|
|
|
|
rt = ip6_dst_alloc(net, dev, 0);
|
|
if (unlikely(!rt)) {
|
|
in6_dev_put(idev);
|
|
dst = ERR_PTR(-ENOMEM);
|
|
goto out;
|
|
}
|
|
|
|
rt->dst.flags |= DST_HOST;
|
|
rt->dst.output = ip6_output;
|
|
atomic_set(&rt->dst.__refcnt, 1);
|
|
rt->rt6i_gateway = fl6->daddr;
|
|
rt->rt6i_dst.addr = fl6->daddr;
|
|
rt->rt6i_dst.plen = 128;
|
|
rt->rt6i_idev = idev;
|
|
dst_metric_set(&rt->dst, RTAX_HOPLIMIT, 0);
|
|
|
|
spin_lock_bh(&icmp6_dst_lock);
|
|
rt->dst.next = icmp6_dst_gc_list;
|
|
icmp6_dst_gc_list = &rt->dst;
|
|
spin_unlock_bh(&icmp6_dst_lock);
|
|
|
|
fib6_force_start_gc(net);
|
|
|
|
dst = xfrm_lookup(net, &rt->dst, flowi6_to_flowi(fl6), NULL, 0);
|
|
|
|
out:
|
|
return dst;
|
|
}
|
|
|
|
int icmp6_dst_gc(void)
|
|
{
|
|
struct dst_entry *dst, **pprev;
|
|
int more = 0;
|
|
|
|
spin_lock_bh(&icmp6_dst_lock);
|
|
pprev = &icmp6_dst_gc_list;
|
|
|
|
while ((dst = *pprev) != NULL) {
|
|
if (!atomic_read(&dst->__refcnt)) {
|
|
*pprev = dst->next;
|
|
dst_free(dst);
|
|
} else {
|
|
pprev = &dst->next;
|
|
++more;
|
|
}
|
|
}
|
|
|
|
spin_unlock_bh(&icmp6_dst_lock);
|
|
|
|
return more;
|
|
}
|
|
|
|
static void icmp6_clean_all(int (*func)(struct rt6_info *rt, void *arg),
|
|
void *arg)
|
|
{
|
|
struct dst_entry *dst, **pprev;
|
|
|
|
spin_lock_bh(&icmp6_dst_lock);
|
|
pprev = &icmp6_dst_gc_list;
|
|
while ((dst = *pprev) != NULL) {
|
|
struct rt6_info *rt = (struct rt6_info *) dst;
|
|
if (func(rt, arg)) {
|
|
*pprev = dst->next;
|
|
dst_free(dst);
|
|
} else {
|
|
pprev = &dst->next;
|
|
}
|
|
}
|
|
spin_unlock_bh(&icmp6_dst_lock);
|
|
}
|
|
|
|
static int ip6_dst_gc(struct dst_ops *ops)
|
|
{
|
|
struct net *net = container_of(ops, struct net, ipv6.ip6_dst_ops);
|
|
int rt_min_interval = net->ipv6.sysctl.ip6_rt_gc_min_interval;
|
|
int rt_max_size = net->ipv6.sysctl.ip6_rt_max_size;
|
|
int rt_elasticity = net->ipv6.sysctl.ip6_rt_gc_elasticity;
|
|
int rt_gc_timeout = net->ipv6.sysctl.ip6_rt_gc_timeout;
|
|
unsigned long rt_last_gc = net->ipv6.ip6_rt_last_gc;
|
|
int entries;
|
|
|
|
entries = dst_entries_get_fast(ops);
|
|
if (time_after(rt_last_gc + rt_min_interval, jiffies) &&
|
|
entries <= rt_max_size)
|
|
goto out;
|
|
|
|
net->ipv6.ip6_rt_gc_expire++;
|
|
fib6_run_gc(net->ipv6.ip6_rt_gc_expire, net, true);
|
|
entries = dst_entries_get_slow(ops);
|
|
if (entries < ops->gc_thresh)
|
|
net->ipv6.ip6_rt_gc_expire = rt_gc_timeout>>1;
|
|
out:
|
|
net->ipv6.ip6_rt_gc_expire -= net->ipv6.ip6_rt_gc_expire>>rt_elasticity;
|
|
return entries > rt_max_size;
|
|
}
|
|
|
|
static int ip6_convert_metrics(struct mx6_config *mxc,
|
|
const struct fib6_config *cfg)
|
|
{
|
|
bool ecn_ca = false;
|
|
struct nlattr *nla;
|
|
int remaining;
|
|
u32 *mp;
|
|
|
|
if (!cfg->fc_mx)
|
|
return 0;
|
|
|
|
mp = kzalloc(sizeof(u32) * RTAX_MAX, GFP_KERNEL);
|
|
if (unlikely(!mp))
|
|
return -ENOMEM;
|
|
|
|
nla_for_each_attr(nla, cfg->fc_mx, cfg->fc_mx_len, remaining) {
|
|
int type = nla_type(nla);
|
|
u32 val;
|
|
|
|
if (!type)
|
|
continue;
|
|
if (unlikely(type > RTAX_MAX))
|
|
goto err;
|
|
|
|
if (type == RTAX_CC_ALGO) {
|
|
char tmp[TCP_CA_NAME_MAX];
|
|
|
|
nla_strlcpy(tmp, nla, sizeof(tmp));
|
|
val = tcp_ca_get_key_by_name(tmp, &ecn_ca);
|
|
if (val == TCP_CA_UNSPEC)
|
|
goto err;
|
|
} else {
|
|
val = nla_get_u32(nla);
|
|
}
|
|
if (type == RTAX_HOPLIMIT && val > 255)
|
|
val = 255;
|
|
if (type == RTAX_FEATURES && (val & ~RTAX_FEATURE_MASK))
|
|
goto err;
|
|
|
|
mp[type - 1] = val;
|
|
__set_bit(type - 1, mxc->mx_valid);
|
|
}
|
|
|
|
if (ecn_ca) {
|
|
__set_bit(RTAX_FEATURES - 1, mxc->mx_valid);
|
|
mp[RTAX_FEATURES - 1] |= DST_FEATURE_ECN_CA;
|
|
}
|
|
|
|
mxc->mx = mp;
|
|
return 0;
|
|
err:
|
|
kfree(mp);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct rt6_info *ip6_nh_lookup_table(struct net *net,
|
|
struct fib6_config *cfg,
|
|
const struct in6_addr *gw_addr)
|
|
{
|
|
struct flowi6 fl6 = {
|
|
.flowi6_oif = cfg->fc_ifindex,
|
|
.daddr = *gw_addr,
|
|
.saddr = cfg->fc_prefsrc,
|
|
};
|
|
struct fib6_table *table;
|
|
struct rt6_info *rt;
|
|
int flags = RT6_LOOKUP_F_IFACE | RT6_LOOKUP_F_IGNORE_LINKSTATE;
|
|
|
|
table = fib6_get_table(net, cfg->fc_table);
|
|
if (!table)
|
|
return NULL;
|
|
|
|
if (!ipv6_addr_any(&cfg->fc_prefsrc))
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
|
|
rt = ip6_pol_route(net, table, cfg->fc_ifindex, &fl6, flags);
|
|
|
|
/* if table lookup failed, fall back to full lookup */
|
|
if (rt == net->ipv6.ip6_null_entry) {
|
|
ip6_rt_put(rt);
|
|
rt = NULL;
|
|
}
|
|
|
|
return rt;
|
|
}
|
|
|
|
static struct rt6_info *ip6_route_info_create(struct fib6_config *cfg)
|
|
{
|
|
struct net *net = cfg->fc_nlinfo.nl_net;
|
|
struct rt6_info *rt = NULL;
|
|
struct net_device *dev = NULL;
|
|
struct inet6_dev *idev = NULL;
|
|
struct fib6_table *table;
|
|
int addr_type;
|
|
int err = -EINVAL;
|
|
|
|
if (cfg->fc_dst_len > 128 || cfg->fc_src_len > 128)
|
|
goto out;
|
|
#ifndef CONFIG_IPV6_SUBTREES
|
|
if (cfg->fc_src_len)
|
|
goto out;
|
|
#endif
|
|
if (cfg->fc_ifindex) {
|
|
err = -ENODEV;
|
|
dev = dev_get_by_index(net, cfg->fc_ifindex);
|
|
if (!dev)
|
|
goto out;
|
|
idev = in6_dev_get(dev);
|
|
if (!idev)
|
|
goto out;
|
|
}
|
|
|
|
if (cfg->fc_metric == 0)
|
|
cfg->fc_metric = IP6_RT_PRIO_USER;
|
|
|
|
err = -ENOBUFS;
|
|
if (cfg->fc_nlinfo.nlh &&
|
|
!(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_CREATE)) {
|
|
table = fib6_get_table(net, cfg->fc_table);
|
|
if (!table) {
|
|
pr_warn("NLM_F_CREATE should be specified when creating new route\n");
|
|
table = fib6_new_table(net, cfg->fc_table);
|
|
}
|
|
} else {
|
|
table = fib6_new_table(net, cfg->fc_table);
|
|
}
|
|
|
|
if (!table)
|
|
goto out;
|
|
|
|
rt = ip6_dst_alloc(net, NULL,
|
|
(cfg->fc_flags & RTF_ADDRCONF) ? 0 : DST_NOCOUNT);
|
|
|
|
if (!rt) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
if (cfg->fc_flags & RTF_EXPIRES)
|
|
rt6_set_expires(rt, jiffies +
|
|
clock_t_to_jiffies(cfg->fc_expires));
|
|
else
|
|
rt6_clean_expires(rt);
|
|
|
|
if (cfg->fc_protocol == RTPROT_UNSPEC)
|
|
cfg->fc_protocol = RTPROT_BOOT;
|
|
rt->rt6i_protocol = cfg->fc_protocol;
|
|
|
|
addr_type = ipv6_addr_type(&cfg->fc_dst);
|
|
|
|
if (addr_type & IPV6_ADDR_MULTICAST)
|
|
rt->dst.input = ip6_mc_input;
|
|
else if (cfg->fc_flags & RTF_LOCAL)
|
|
rt->dst.input = ip6_input;
|
|
else
|
|
rt->dst.input = ip6_forward;
|
|
|
|
rt->dst.output = ip6_output;
|
|
|
|
if (cfg->fc_encap) {
|
|
struct lwtunnel_state *lwtstate;
|
|
|
|
err = lwtunnel_build_state(dev, cfg->fc_encap_type,
|
|
cfg->fc_encap, AF_INET6, cfg,
|
|
&lwtstate);
|
|
if (err)
|
|
goto out;
|
|
rt->dst.lwtstate = lwtstate_get(lwtstate);
|
|
if (lwtunnel_output_redirect(rt->dst.lwtstate)) {
|
|
rt->dst.lwtstate->orig_output = rt->dst.output;
|
|
rt->dst.output = lwtunnel_output;
|
|
}
|
|
if (lwtunnel_input_redirect(rt->dst.lwtstate)) {
|
|
rt->dst.lwtstate->orig_input = rt->dst.input;
|
|
rt->dst.input = lwtunnel_input;
|
|
}
|
|
}
|
|
|
|
ipv6_addr_prefix(&rt->rt6i_dst.addr, &cfg->fc_dst, cfg->fc_dst_len);
|
|
rt->rt6i_dst.plen = cfg->fc_dst_len;
|
|
if (rt->rt6i_dst.plen == 128)
|
|
rt->dst.flags |= DST_HOST;
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
ipv6_addr_prefix(&rt->rt6i_src.addr, &cfg->fc_src, cfg->fc_src_len);
|
|
rt->rt6i_src.plen = cfg->fc_src_len;
|
|
#endif
|
|
|
|
rt->rt6i_metric = cfg->fc_metric;
|
|
|
|
/* We cannot add true routes via loopback here,
|
|
they would result in kernel looping; promote them to reject routes
|
|
*/
|
|
if ((cfg->fc_flags & RTF_REJECT) ||
|
|
(dev && (dev->flags & IFF_LOOPBACK) &&
|
|
!(addr_type & IPV6_ADDR_LOOPBACK) &&
|
|
!(cfg->fc_flags & RTF_LOCAL))) {
|
|
/* hold loopback dev/idev if we haven't done so. */
|
|
if (dev != net->loopback_dev) {
|
|
if (dev) {
|
|
dev_put(dev);
|
|
in6_dev_put(idev);
|
|
}
|
|
dev = net->loopback_dev;
|
|
dev_hold(dev);
|
|
idev = in6_dev_get(dev);
|
|
if (!idev) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
}
|
|
rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
|
|
switch (cfg->fc_type) {
|
|
case RTN_BLACKHOLE:
|
|
rt->dst.error = -EINVAL;
|
|
rt->dst.output = dst_discard_out;
|
|
rt->dst.input = dst_discard;
|
|
break;
|
|
case RTN_PROHIBIT:
|
|
rt->dst.error = -EACCES;
|
|
rt->dst.output = ip6_pkt_prohibit_out;
|
|
rt->dst.input = ip6_pkt_prohibit;
|
|
break;
|
|
case RTN_THROW:
|
|
case RTN_UNREACHABLE:
|
|
default:
|
|
rt->dst.error = (cfg->fc_type == RTN_THROW) ? -EAGAIN
|
|
: (cfg->fc_type == RTN_UNREACHABLE)
|
|
? -EHOSTUNREACH : -ENETUNREACH;
|
|
rt->dst.output = ip6_pkt_discard_out;
|
|
rt->dst.input = ip6_pkt_discard;
|
|
break;
|
|
}
|
|
goto install_route;
|
|
}
|
|
|
|
if (cfg->fc_flags & RTF_GATEWAY) {
|
|
const struct in6_addr *gw_addr;
|
|
int gwa_type;
|
|
|
|
gw_addr = &cfg->fc_gateway;
|
|
gwa_type = ipv6_addr_type(gw_addr);
|
|
|
|
/* if gw_addr is local we will fail to detect this in case
|
|
* address is still TENTATIVE (DAD in progress). rt6_lookup()
|
|
* will return already-added prefix route via interface that
|
|
* prefix route was assigned to, which might be non-loopback.
|
|
*/
|
|
err = -EINVAL;
|
|
if (ipv6_chk_addr_and_flags(net, gw_addr,
|
|
gwa_type & IPV6_ADDR_LINKLOCAL ?
|
|
dev : NULL, 0, 0))
|
|
goto out;
|
|
|
|
rt->rt6i_gateway = *gw_addr;
|
|
|
|
if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
|
|
struct rt6_info *grt = NULL;
|
|
|
|
/* IPv6 strictly inhibits using not link-local
|
|
addresses as nexthop address.
|
|
Otherwise, router will not able to send redirects.
|
|
It is very good, but in some (rare!) circumstances
|
|
(SIT, PtP, NBMA NOARP links) it is handy to allow
|
|
some exceptions. --ANK
|
|
*/
|
|
if (!(gwa_type & IPV6_ADDR_UNICAST))
|
|
goto out;
|
|
|
|
if (cfg->fc_table) {
|
|
grt = ip6_nh_lookup_table(net, cfg, gw_addr);
|
|
|
|
if (grt) {
|
|
if (grt->rt6i_flags & RTF_GATEWAY ||
|
|
(dev && dev != grt->dst.dev)) {
|
|
ip6_rt_put(grt);
|
|
grt = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!grt)
|
|
grt = rt6_lookup(net, gw_addr, NULL,
|
|
cfg->fc_ifindex, 1);
|
|
|
|
err = -EHOSTUNREACH;
|
|
if (!grt)
|
|
goto out;
|
|
if (dev) {
|
|
if (dev != grt->dst.dev) {
|
|
ip6_rt_put(grt);
|
|
goto out;
|
|
}
|
|
} else {
|
|
dev = grt->dst.dev;
|
|
idev = grt->rt6i_idev;
|
|
dev_hold(dev);
|
|
in6_dev_hold(grt->rt6i_idev);
|
|
}
|
|
if (!(grt->rt6i_flags & RTF_GATEWAY))
|
|
err = 0;
|
|
ip6_rt_put(grt);
|
|
|
|
if (err)
|
|
goto out;
|
|
}
|
|
err = -EINVAL;
|
|
if (!dev || (dev->flags & IFF_LOOPBACK))
|
|
goto out;
|
|
}
|
|
|
|
err = -ENODEV;
|
|
if (!dev)
|
|
goto out;
|
|
|
|
if (!ipv6_addr_any(&cfg->fc_prefsrc)) {
|
|
if (!ipv6_chk_addr(net, &cfg->fc_prefsrc, dev, 0)) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
rt->rt6i_prefsrc.addr = cfg->fc_prefsrc;
|
|
rt->rt6i_prefsrc.plen = 128;
|
|
} else
|
|
rt->rt6i_prefsrc.plen = 0;
|
|
|
|
rt->rt6i_flags = cfg->fc_flags;
|
|
|
|
install_route:
|
|
rt->dst.dev = dev;
|
|
rt->rt6i_idev = idev;
|
|
rt->rt6i_table = table;
|
|
|
|
cfg->fc_nlinfo.nl_net = dev_net(dev);
|
|
|
|
return rt;
|
|
out:
|
|
if (dev)
|
|
dev_put(dev);
|
|
if (idev)
|
|
in6_dev_put(idev);
|
|
if (rt)
|
|
dst_free(&rt->dst);
|
|
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
int ip6_route_add(struct fib6_config *cfg)
|
|
{
|
|
struct mx6_config mxc = { .mx = NULL, };
|
|
struct rt6_info *rt;
|
|
int err;
|
|
|
|
rt = ip6_route_info_create(cfg);
|
|
if (IS_ERR(rt)) {
|
|
err = PTR_ERR(rt);
|
|
rt = NULL;
|
|
goto out;
|
|
}
|
|
|
|
err = ip6_convert_metrics(&mxc, cfg);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = __ip6_ins_rt(rt, &cfg->fc_nlinfo, &mxc);
|
|
|
|
kfree(mxc.mx);
|
|
|
|
return err;
|
|
out:
|
|
if (rt)
|
|
dst_free(&rt->dst);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __ip6_del_rt(struct rt6_info *rt, struct nl_info *info)
|
|
{
|
|
int err;
|
|
struct fib6_table *table;
|
|
struct net *net = dev_net(rt->dst.dev);
|
|
|
|
if (rt == net->ipv6.ip6_null_entry ||
|
|
rt->dst.flags & DST_NOCACHE) {
|
|
err = -ENOENT;
|
|
goto out;
|
|
}
|
|
|
|
table = rt->rt6i_table;
|
|
write_lock_bh(&table->tb6_lock);
|
|
err = fib6_del(rt, info);
|
|
write_unlock_bh(&table->tb6_lock);
|
|
|
|
out:
|
|
ip6_rt_put(rt);
|
|
return err;
|
|
}
|
|
|
|
int ip6_del_rt(struct rt6_info *rt)
|
|
{
|
|
struct nl_info info = {
|
|
.nl_net = dev_net(rt->dst.dev),
|
|
};
|
|
return __ip6_del_rt(rt, &info);
|
|
}
|
|
|
|
static int ip6_route_del(struct fib6_config *cfg)
|
|
{
|
|
struct fib6_table *table;
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt;
|
|
int err = -ESRCH;
|
|
|
|
table = fib6_get_table(cfg->fc_nlinfo.nl_net, cfg->fc_table);
|
|
if (!table)
|
|
return err;
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
|
|
fn = fib6_locate(&table->tb6_root,
|
|
&cfg->fc_dst, cfg->fc_dst_len,
|
|
&cfg->fc_src, cfg->fc_src_len);
|
|
|
|
if (fn) {
|
|
for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
|
|
if ((rt->rt6i_flags & RTF_CACHE) &&
|
|
!(cfg->fc_flags & RTF_CACHE))
|
|
continue;
|
|
if (cfg->fc_ifindex &&
|
|
(!rt->dst.dev ||
|
|
rt->dst.dev->ifindex != cfg->fc_ifindex))
|
|
continue;
|
|
if (cfg->fc_flags & RTF_GATEWAY &&
|
|
!ipv6_addr_equal(&cfg->fc_gateway, &rt->rt6i_gateway))
|
|
continue;
|
|
if (cfg->fc_metric && cfg->fc_metric != rt->rt6i_metric)
|
|
continue;
|
|
dst_hold(&rt->dst);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
return __ip6_del_rt(rt, &cfg->fc_nlinfo);
|
|
}
|
|
}
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static void rt6_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct netevent_redirect netevent;
|
|
struct rt6_info *rt, *nrt = NULL;
|
|
struct ndisc_options ndopts;
|
|
struct inet6_dev *in6_dev;
|
|
struct neighbour *neigh;
|
|
struct rd_msg *msg;
|
|
int optlen, on_link;
|
|
u8 *lladdr;
|
|
|
|
optlen = skb_tail_pointer(skb) - skb_transport_header(skb);
|
|
optlen -= sizeof(*msg);
|
|
|
|
if (optlen < 0) {
|
|
net_dbg_ratelimited("rt6_do_redirect: packet too short\n");
|
|
return;
|
|
}
|
|
|
|
msg = (struct rd_msg *)icmp6_hdr(skb);
|
|
|
|
if (ipv6_addr_is_multicast(&msg->dest)) {
|
|
net_dbg_ratelimited("rt6_do_redirect: destination address is multicast\n");
|
|
return;
|
|
}
|
|
|
|
on_link = 0;
|
|
if (ipv6_addr_equal(&msg->dest, &msg->target)) {
|
|
on_link = 1;
|
|
} else if (ipv6_addr_type(&msg->target) !=
|
|
(IPV6_ADDR_UNICAST|IPV6_ADDR_LINKLOCAL)) {
|
|
net_dbg_ratelimited("rt6_do_redirect: target address is not link-local unicast\n");
|
|
return;
|
|
}
|
|
|
|
in6_dev = __in6_dev_get(skb->dev);
|
|
if (!in6_dev)
|
|
return;
|
|
if (in6_dev->cnf.forwarding || !in6_dev->cnf.accept_redirects)
|
|
return;
|
|
|
|
/* RFC2461 8.1:
|
|
* The IP source address of the Redirect MUST be the same as the current
|
|
* first-hop router for the specified ICMP Destination Address.
|
|
*/
|
|
|
|
if (!ndisc_parse_options(skb->dev, msg->opt, optlen, &ndopts)) {
|
|
net_dbg_ratelimited("rt6_redirect: invalid ND options\n");
|
|
return;
|
|
}
|
|
|
|
lladdr = NULL;
|
|
if (ndopts.nd_opts_tgt_lladdr) {
|
|
lladdr = ndisc_opt_addr_data(ndopts.nd_opts_tgt_lladdr,
|
|
skb->dev);
|
|
if (!lladdr) {
|
|
net_dbg_ratelimited("rt6_redirect: invalid link-layer address length\n");
|
|
return;
|
|
}
|
|
}
|
|
|
|
rt = (struct rt6_info *) dst;
|
|
if (rt->rt6i_flags & RTF_REJECT) {
|
|
net_dbg_ratelimited("rt6_redirect: source isn't a valid nexthop for redirect target\n");
|
|
return;
|
|
}
|
|
|
|
/* Redirect received -> path was valid.
|
|
* Look, redirects are sent only in response to data packets,
|
|
* so that this nexthop apparently is reachable. --ANK
|
|
*/
|
|
dst_confirm(&rt->dst);
|
|
|
|
neigh = __neigh_lookup(&nd_tbl, &msg->target, skb->dev, 1);
|
|
if (!neigh)
|
|
return;
|
|
|
|
/*
|
|
* We have finally decided to accept it.
|
|
*/
|
|
|
|
ndisc_update(skb->dev, neigh, lladdr, NUD_STALE,
|
|
NEIGH_UPDATE_F_WEAK_OVERRIDE|
|
|
NEIGH_UPDATE_F_OVERRIDE|
|
|
(on_link ? 0 : (NEIGH_UPDATE_F_OVERRIDE_ISROUTER|
|
|
NEIGH_UPDATE_F_ISROUTER)),
|
|
NDISC_REDIRECT, &ndopts);
|
|
|
|
nrt = ip6_rt_cache_alloc(rt, &msg->dest, NULL);
|
|
if (!nrt)
|
|
goto out;
|
|
|
|
nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
|
|
if (on_link)
|
|
nrt->rt6i_flags &= ~RTF_GATEWAY;
|
|
|
|
nrt->rt6i_gateway = *(struct in6_addr *)neigh->primary_key;
|
|
|
|
if (ip6_ins_rt(nrt))
|
|
goto out;
|
|
|
|
netevent.old = &rt->dst;
|
|
netevent.new = &nrt->dst;
|
|
netevent.daddr = &msg->dest;
|
|
netevent.neigh = neigh;
|
|
call_netevent_notifiers(NETEVENT_REDIRECT, &netevent);
|
|
|
|
if (rt->rt6i_flags & RTF_CACHE) {
|
|
rt = (struct rt6_info *) dst_clone(&rt->dst);
|
|
ip6_del_rt(rt);
|
|
}
|
|
|
|
out:
|
|
neigh_release(neigh);
|
|
}
|
|
|
|
/*
|
|
* Misc support functions
|
|
*/
|
|
|
|
static void rt6_set_from(struct rt6_info *rt, struct rt6_info *from)
|
|
{
|
|
BUG_ON(from->dst.from);
|
|
|
|
rt->rt6i_flags &= ~RTF_EXPIRES;
|
|
dst_hold(&from->dst);
|
|
rt->dst.from = &from->dst;
|
|
dst_init_metrics(&rt->dst, dst_metrics_ptr(&from->dst), true);
|
|
}
|
|
|
|
static void ip6_rt_copy_init(struct rt6_info *rt, struct rt6_info *ort)
|
|
{
|
|
rt->dst.input = ort->dst.input;
|
|
rt->dst.output = ort->dst.output;
|
|
rt->rt6i_dst = ort->rt6i_dst;
|
|
rt->dst.error = ort->dst.error;
|
|
rt->rt6i_idev = ort->rt6i_idev;
|
|
if (rt->rt6i_idev)
|
|
in6_dev_hold(rt->rt6i_idev);
|
|
rt->dst.lastuse = jiffies;
|
|
rt->rt6i_gateway = ort->rt6i_gateway;
|
|
rt->rt6i_flags = ort->rt6i_flags;
|
|
rt6_set_from(rt, ort);
|
|
rt->rt6i_metric = ort->rt6i_metric;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
rt->rt6i_src = ort->rt6i_src;
|
|
#endif
|
|
rt->rt6i_prefsrc = ort->rt6i_prefsrc;
|
|
rt->rt6i_table = ort->rt6i_table;
|
|
rt->dst.lwtstate = lwtstate_get(ort->dst.lwtstate);
|
|
}
|
|
|
|
#ifdef CONFIG_IPV6_ROUTE_INFO
|
|
static struct rt6_info *rt6_get_route_info(struct net *net,
|
|
const struct in6_addr *prefix, int prefixlen,
|
|
const struct in6_addr *gwaddr,
|
|
struct net_device *dev)
|
|
{
|
|
u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO;
|
|
int ifindex = dev->ifindex;
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt = NULL;
|
|
struct fib6_table *table;
|
|
|
|
table = fib6_get_table(net, tb_id);
|
|
if (!table)
|
|
return NULL;
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
fn = fib6_locate(&table->tb6_root, prefix, prefixlen, NULL, 0);
|
|
if (!fn)
|
|
goto out;
|
|
|
|
for (rt = fn->leaf; rt; rt = rt->dst.rt6_next) {
|
|
if (rt->dst.dev->ifindex != ifindex)
|
|
continue;
|
|
if ((rt->rt6i_flags & (RTF_ROUTEINFO|RTF_GATEWAY)) != (RTF_ROUTEINFO|RTF_GATEWAY))
|
|
continue;
|
|
if (!ipv6_addr_equal(&rt->rt6i_gateway, gwaddr))
|
|
continue;
|
|
dst_hold(&rt->dst);
|
|
break;
|
|
}
|
|
out:
|
|
read_unlock_bh(&table->tb6_lock);
|
|
return rt;
|
|
}
|
|
|
|
static struct rt6_info *rt6_add_route_info(struct net *net,
|
|
const struct in6_addr *prefix, int prefixlen,
|
|
const struct in6_addr *gwaddr,
|
|
struct net_device *dev,
|
|
unsigned int pref)
|
|
{
|
|
struct fib6_config cfg = {
|
|
.fc_metric = IP6_RT_PRIO_USER,
|
|
.fc_ifindex = dev->ifindex,
|
|
.fc_dst_len = prefixlen,
|
|
.fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_ROUTEINFO |
|
|
RTF_UP | RTF_PREF(pref),
|
|
.fc_nlinfo.portid = 0,
|
|
.fc_nlinfo.nlh = NULL,
|
|
.fc_nlinfo.nl_net = net,
|
|
};
|
|
|
|
cfg.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_INFO,
|
|
cfg.fc_dst = *prefix;
|
|
cfg.fc_gateway = *gwaddr;
|
|
|
|
/* We should treat it as a default route if prefix length is 0. */
|
|
if (!prefixlen)
|
|
cfg.fc_flags |= RTF_DEFAULT;
|
|
|
|
ip6_route_add(&cfg);
|
|
|
|
return rt6_get_route_info(net, prefix, prefixlen, gwaddr, dev);
|
|
}
|
|
#endif
|
|
|
|
struct rt6_info *rt6_get_dflt_router(const struct in6_addr *addr, struct net_device *dev)
|
|
{
|
|
u32 tb_id = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT;
|
|
struct rt6_info *rt;
|
|
struct fib6_table *table;
|
|
|
|
table = fib6_get_table(dev_net(dev), tb_id);
|
|
if (!table)
|
|
return NULL;
|
|
|
|
read_lock_bh(&table->tb6_lock);
|
|
for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
|
|
if (dev == rt->dst.dev &&
|
|
((rt->rt6i_flags & (RTF_ADDRCONF | RTF_DEFAULT)) == (RTF_ADDRCONF | RTF_DEFAULT)) &&
|
|
ipv6_addr_equal(&rt->rt6i_gateway, addr))
|
|
break;
|
|
}
|
|
if (rt)
|
|
dst_hold(&rt->dst);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
return rt;
|
|
}
|
|
|
|
struct rt6_info *rt6_add_dflt_router(const struct in6_addr *gwaddr,
|
|
struct net_device *dev,
|
|
unsigned int pref)
|
|
{
|
|
struct fib6_config cfg = {
|
|
.fc_table = l3mdev_fib_table(dev) ? : RT6_TABLE_DFLT,
|
|
.fc_metric = IP6_RT_PRIO_USER,
|
|
.fc_ifindex = dev->ifindex,
|
|
.fc_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT |
|
|
RTF_UP | RTF_EXPIRES | RTF_PREF(pref),
|
|
.fc_nlinfo.portid = 0,
|
|
.fc_nlinfo.nlh = NULL,
|
|
.fc_nlinfo.nl_net = dev_net(dev),
|
|
};
|
|
|
|
cfg.fc_gateway = *gwaddr;
|
|
|
|
if (!ip6_route_add(&cfg)) {
|
|
struct fib6_table *table;
|
|
|
|
table = fib6_get_table(dev_net(dev), cfg.fc_table);
|
|
if (table)
|
|
table->flags |= RT6_TABLE_HAS_DFLT_ROUTER;
|
|
}
|
|
|
|
return rt6_get_dflt_router(gwaddr, dev);
|
|
}
|
|
|
|
static void __rt6_purge_dflt_routers(struct fib6_table *table)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
restart:
|
|
read_lock_bh(&table->tb6_lock);
|
|
for (rt = table->tb6_root.leaf; rt; rt = rt->dst.rt6_next) {
|
|
if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF) &&
|
|
(!rt->rt6i_idev || rt->rt6i_idev->cnf.accept_ra != 2)) {
|
|
dst_hold(&rt->dst);
|
|
read_unlock_bh(&table->tb6_lock);
|
|
ip6_del_rt(rt);
|
|
goto restart;
|
|
}
|
|
}
|
|
read_unlock_bh(&table->tb6_lock);
|
|
|
|
table->flags &= ~RT6_TABLE_HAS_DFLT_ROUTER;
|
|
}
|
|
|
|
void rt6_purge_dflt_routers(struct net *net)
|
|
{
|
|
struct fib6_table *table;
|
|
struct hlist_head *head;
|
|
unsigned int h;
|
|
|
|
rcu_read_lock();
|
|
|
|
for (h = 0; h < FIB6_TABLE_HASHSZ; h++) {
|
|
head = &net->ipv6.fib_table_hash[h];
|
|
hlist_for_each_entry_rcu(table, head, tb6_hlist) {
|
|
if (table->flags & RT6_TABLE_HAS_DFLT_ROUTER)
|
|
__rt6_purge_dflt_routers(table);
|
|
}
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static void rtmsg_to_fib6_config(struct net *net,
|
|
struct in6_rtmsg *rtmsg,
|
|
struct fib6_config *cfg)
|
|
{
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
|
|
cfg->fc_table = l3mdev_fib_table_by_index(net, rtmsg->rtmsg_ifindex) ?
|
|
: RT6_TABLE_MAIN;
|
|
cfg->fc_ifindex = rtmsg->rtmsg_ifindex;
|
|
cfg->fc_metric = rtmsg->rtmsg_metric;
|
|
cfg->fc_expires = rtmsg->rtmsg_info;
|
|
cfg->fc_dst_len = rtmsg->rtmsg_dst_len;
|
|
cfg->fc_src_len = rtmsg->rtmsg_src_len;
|
|
cfg->fc_flags = rtmsg->rtmsg_flags;
|
|
|
|
cfg->fc_nlinfo.nl_net = net;
|
|
|
|
cfg->fc_dst = rtmsg->rtmsg_dst;
|
|
cfg->fc_src = rtmsg->rtmsg_src;
|
|
cfg->fc_gateway = rtmsg->rtmsg_gateway;
|
|
}
|
|
|
|
int ipv6_route_ioctl(struct net *net, unsigned int cmd, void __user *arg)
|
|
{
|
|
struct fib6_config cfg;
|
|
struct in6_rtmsg rtmsg;
|
|
int err;
|
|
|
|
switch (cmd) {
|
|
case SIOCADDRT: /* Add a route */
|
|
case SIOCDELRT: /* Delete a route */
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
err = copy_from_user(&rtmsg, arg,
|
|
sizeof(struct in6_rtmsg));
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
rtmsg_to_fib6_config(net, &rtmsg, &cfg);
|
|
|
|
rtnl_lock();
|
|
switch (cmd) {
|
|
case SIOCADDRT:
|
|
err = ip6_route_add(&cfg);
|
|
break;
|
|
case SIOCDELRT:
|
|
err = ip6_route_del(&cfg);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Drop the packet on the floor
|
|
*/
|
|
|
|
static int ip6_pkt_drop(struct sk_buff *skb, u8 code, int ipstats_mib_noroutes)
|
|
{
|
|
int type;
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
switch (ipstats_mib_noroutes) {
|
|
case IPSTATS_MIB_INNOROUTES:
|
|
type = ipv6_addr_type(&ipv6_hdr(skb)->daddr);
|
|
if (type == IPV6_ADDR_ANY) {
|
|
IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
|
|
IPSTATS_MIB_INADDRERRORS);
|
|
break;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case IPSTATS_MIB_OUTNOROUTES:
|
|
IP6_INC_STATS(dev_net(dst->dev), ip6_dst_idev(dst),
|
|
ipstats_mib_noroutes);
|
|
break;
|
|
}
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, code, 0);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_pkt_discard(struct sk_buff *skb)
|
|
{
|
|
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_INNOROUTES);
|
|
}
|
|
|
|
static int ip6_pkt_discard_out(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
skb->dev = skb_dst(skb)->dev;
|
|
return ip6_pkt_drop(skb, ICMPV6_NOROUTE, IPSTATS_MIB_OUTNOROUTES);
|
|
}
|
|
|
|
static int ip6_pkt_prohibit(struct sk_buff *skb)
|
|
{
|
|
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_INNOROUTES);
|
|
}
|
|
|
|
static int ip6_pkt_prohibit_out(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
skb->dev = skb_dst(skb)->dev;
|
|
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
|
|
}
|
|
|
|
/*
|
|
* Allocate a dst for local (unicast / anycast) address.
|
|
*/
|
|
|
|
struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
|
|
const struct in6_addr *addr,
|
|
bool anycast)
|
|
{
|
|
u32 tb_id;
|
|
struct net *net = dev_net(idev->dev);
|
|
struct net_device *dev = net->loopback_dev;
|
|
struct rt6_info *rt;
|
|
|
|
/* use L3 Master device as loopback for host routes if device
|
|
* is enslaved and address is not link local or multicast
|
|
*/
|
|
if (!rt6_need_strict(addr))
|
|
dev = l3mdev_master_dev_rcu(idev->dev) ? : dev;
|
|
|
|
rt = ip6_dst_alloc(net, dev, DST_NOCOUNT);
|
|
if (!rt)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
in6_dev_hold(idev);
|
|
|
|
rt->dst.flags |= DST_HOST;
|
|
rt->dst.input = ip6_input;
|
|
rt->dst.output = ip6_output;
|
|
rt->rt6i_idev = idev;
|
|
|
|
rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
|
|
if (anycast)
|
|
rt->rt6i_flags |= RTF_ANYCAST;
|
|
else
|
|
rt->rt6i_flags |= RTF_LOCAL;
|
|
|
|
rt->rt6i_gateway = *addr;
|
|
rt->rt6i_dst.addr = *addr;
|
|
rt->rt6i_dst.plen = 128;
|
|
tb_id = l3mdev_fib_table(idev->dev) ? : RT6_TABLE_LOCAL;
|
|
rt->rt6i_table = fib6_get_table(net, tb_id);
|
|
rt->dst.flags |= DST_NOCACHE;
|
|
|
|
atomic_set(&rt->dst.__refcnt, 1);
|
|
|
|
return rt;
|
|
}
|
|
|
|
/* remove deleted ip from prefsrc entries */
|
|
struct arg_dev_net_ip {
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
struct in6_addr *addr;
|
|
};
|
|
|
|
static int fib6_remove_prefsrc(struct rt6_info *rt, void *arg)
|
|
{
|
|
struct net_device *dev = ((struct arg_dev_net_ip *)arg)->dev;
|
|
struct net *net = ((struct arg_dev_net_ip *)arg)->net;
|
|
struct in6_addr *addr = ((struct arg_dev_net_ip *)arg)->addr;
|
|
|
|
if (((void *)rt->dst.dev == dev || !dev) &&
|
|
rt != net->ipv6.ip6_null_entry &&
|
|
ipv6_addr_equal(addr, &rt->rt6i_prefsrc.addr)) {
|
|
/* remove prefsrc entry */
|
|
rt->rt6i_prefsrc.plen = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void rt6_remove_prefsrc(struct inet6_ifaddr *ifp)
|
|
{
|
|
struct net *net = dev_net(ifp->idev->dev);
|
|
struct arg_dev_net_ip adni = {
|
|
.dev = ifp->idev->dev,
|
|
.net = net,
|
|
.addr = &ifp->addr,
|
|
};
|
|
fib6_clean_all(net, fib6_remove_prefsrc, &adni);
|
|
}
|
|
|
|
#define RTF_RA_ROUTER (RTF_ADDRCONF | RTF_DEFAULT | RTF_GATEWAY)
|
|
#define RTF_CACHE_GATEWAY (RTF_GATEWAY | RTF_CACHE)
|
|
|
|
/* Remove routers and update dst entries when gateway turn into host. */
|
|
static int fib6_clean_tohost(struct rt6_info *rt, void *arg)
|
|
{
|
|
struct in6_addr *gateway = (struct in6_addr *)arg;
|
|
|
|
if ((((rt->rt6i_flags & RTF_RA_ROUTER) == RTF_RA_ROUTER) ||
|
|
((rt->rt6i_flags & RTF_CACHE_GATEWAY) == RTF_CACHE_GATEWAY)) &&
|
|
ipv6_addr_equal(gateway, &rt->rt6i_gateway)) {
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void rt6_clean_tohost(struct net *net, struct in6_addr *gateway)
|
|
{
|
|
fib6_clean_all(net, fib6_clean_tohost, gateway);
|
|
}
|
|
|
|
struct arg_dev_net {
|
|
struct net_device *dev;
|
|
struct net *net;
|
|
};
|
|
|
|
static int fib6_ifdown(struct rt6_info *rt, void *arg)
|
|
{
|
|
const struct arg_dev_net *adn = arg;
|
|
const struct net_device *dev = adn->dev;
|
|
|
|
if ((rt->dst.dev == dev || !dev) &&
|
|
rt != adn->net->ipv6.ip6_null_entry)
|
|
return -1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void rt6_ifdown(struct net *net, struct net_device *dev)
|
|
{
|
|
struct arg_dev_net adn = {
|
|
.dev = dev,
|
|
.net = net,
|
|
};
|
|
|
|
fib6_clean_all(net, fib6_ifdown, &adn);
|
|
icmp6_clean_all(fib6_ifdown, &adn);
|
|
if (dev)
|
|
rt6_uncached_list_flush_dev(net, dev);
|
|
}
|
|
|
|
struct rt6_mtu_change_arg {
|
|
struct net_device *dev;
|
|
unsigned int mtu;
|
|
};
|
|
|
|
static int rt6_mtu_change_route(struct rt6_info *rt, void *p_arg)
|
|
{
|
|
struct rt6_mtu_change_arg *arg = (struct rt6_mtu_change_arg *) p_arg;
|
|
struct inet6_dev *idev;
|
|
|
|
/* In IPv6 pmtu discovery is not optional,
|
|
so that RTAX_MTU lock cannot disable it.
|
|
We still use this lock to block changes
|
|
caused by addrconf/ndisc.
|
|
*/
|
|
|
|
idev = __in6_dev_get(arg->dev);
|
|
if (!idev)
|
|
return 0;
|
|
|
|
/* For administrative MTU increase, there is no way to discover
|
|
IPv6 PMTU increase, so PMTU increase should be updated here.
|
|
Since RFC 1981 doesn't include administrative MTU increase
|
|
update PMTU increase is a MUST. (i.e. jumbo frame)
|
|
*/
|
|
/*
|
|
If new MTU is less than route PMTU, this new MTU will be the
|
|
lowest MTU in the path, update the route PMTU to reflect PMTU
|
|
decreases; if new MTU is greater than route PMTU, and the
|
|
old MTU is the lowest MTU in the path, update the route PMTU
|
|
to reflect the increase. In this case if the other nodes' MTU
|
|
also have the lowest MTU, TOO BIG MESSAGE will be lead to
|
|
PMTU discouvery.
|
|
*/
|
|
if (rt->dst.dev == arg->dev &&
|
|
dst_metric_raw(&rt->dst, RTAX_MTU) &&
|
|
!dst_metric_locked(&rt->dst, RTAX_MTU)) {
|
|
if (rt->rt6i_flags & RTF_CACHE) {
|
|
/* For RTF_CACHE with rt6i_pmtu == 0
|
|
* (i.e. a redirected route),
|
|
* the metrics of its rt->dst.from has already
|
|
* been updated.
|
|
*/
|
|
if (rt->rt6i_pmtu && rt->rt6i_pmtu > arg->mtu)
|
|
rt->rt6i_pmtu = arg->mtu;
|
|
} else if (dst_mtu(&rt->dst) >= arg->mtu ||
|
|
(dst_mtu(&rt->dst) < arg->mtu &&
|
|
dst_mtu(&rt->dst) == idev->cnf.mtu6)) {
|
|
dst_metric_set(&rt->dst, RTAX_MTU, arg->mtu);
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void rt6_mtu_change(struct net_device *dev, unsigned int mtu)
|
|
{
|
|
struct rt6_mtu_change_arg arg = {
|
|
.dev = dev,
|
|
.mtu = mtu,
|
|
};
|
|
|
|
fib6_clean_all(dev_net(dev), rt6_mtu_change_route, &arg);
|
|
}
|
|
|
|
static const struct nla_policy rtm_ipv6_policy[RTA_MAX+1] = {
|
|
[RTA_GATEWAY] = { .len = sizeof(struct in6_addr) },
|
|
[RTA_OIF] = { .type = NLA_U32 },
|
|
[RTA_IIF] = { .type = NLA_U32 },
|
|
[RTA_PRIORITY] = { .type = NLA_U32 },
|
|
[RTA_METRICS] = { .type = NLA_NESTED },
|
|
[RTA_MULTIPATH] = { .len = sizeof(struct rtnexthop) },
|
|
[RTA_PREF] = { .type = NLA_U8 },
|
|
[RTA_ENCAP_TYPE] = { .type = NLA_U16 },
|
|
[RTA_ENCAP] = { .type = NLA_NESTED },
|
|
[RTA_EXPIRES] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int rtm_to_fib6_config(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct fib6_config *cfg)
|
|
{
|
|
struct rtmsg *rtm;
|
|
struct nlattr *tb[RTA_MAX+1];
|
|
unsigned int pref;
|
|
int err;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = -EINVAL;
|
|
rtm = nlmsg_data(nlh);
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
|
|
cfg->fc_table = rtm->rtm_table;
|
|
cfg->fc_dst_len = rtm->rtm_dst_len;
|
|
cfg->fc_src_len = rtm->rtm_src_len;
|
|
cfg->fc_flags = RTF_UP;
|
|
cfg->fc_protocol = rtm->rtm_protocol;
|
|
cfg->fc_type = rtm->rtm_type;
|
|
|
|
if (rtm->rtm_type == RTN_UNREACHABLE ||
|
|
rtm->rtm_type == RTN_BLACKHOLE ||
|
|
rtm->rtm_type == RTN_PROHIBIT ||
|
|
rtm->rtm_type == RTN_THROW)
|
|
cfg->fc_flags |= RTF_REJECT;
|
|
|
|
if (rtm->rtm_type == RTN_LOCAL)
|
|
cfg->fc_flags |= RTF_LOCAL;
|
|
|
|
if (rtm->rtm_flags & RTM_F_CLONED)
|
|
cfg->fc_flags |= RTF_CACHE;
|
|
|
|
cfg->fc_nlinfo.portid = NETLINK_CB(skb).portid;
|
|
cfg->fc_nlinfo.nlh = nlh;
|
|
cfg->fc_nlinfo.nl_net = sock_net(skb->sk);
|
|
|
|
if (tb[RTA_GATEWAY]) {
|
|
cfg->fc_gateway = nla_get_in6_addr(tb[RTA_GATEWAY]);
|
|
cfg->fc_flags |= RTF_GATEWAY;
|
|
}
|
|
|
|
if (tb[RTA_DST]) {
|
|
int plen = (rtm->rtm_dst_len + 7) >> 3;
|
|
|
|
if (nla_len(tb[RTA_DST]) < plen)
|
|
goto errout;
|
|
|
|
nla_memcpy(&cfg->fc_dst, tb[RTA_DST], plen);
|
|
}
|
|
|
|
if (tb[RTA_SRC]) {
|
|
int plen = (rtm->rtm_src_len + 7) >> 3;
|
|
|
|
if (nla_len(tb[RTA_SRC]) < plen)
|
|
goto errout;
|
|
|
|
nla_memcpy(&cfg->fc_src, tb[RTA_SRC], plen);
|
|
}
|
|
|
|
if (tb[RTA_PREFSRC])
|
|
cfg->fc_prefsrc = nla_get_in6_addr(tb[RTA_PREFSRC]);
|
|
|
|
if (tb[RTA_OIF])
|
|
cfg->fc_ifindex = nla_get_u32(tb[RTA_OIF]);
|
|
|
|
if (tb[RTA_PRIORITY])
|
|
cfg->fc_metric = nla_get_u32(tb[RTA_PRIORITY]);
|
|
|
|
if (tb[RTA_METRICS]) {
|
|
cfg->fc_mx = nla_data(tb[RTA_METRICS]);
|
|
cfg->fc_mx_len = nla_len(tb[RTA_METRICS]);
|
|
}
|
|
|
|
if (tb[RTA_TABLE])
|
|
cfg->fc_table = nla_get_u32(tb[RTA_TABLE]);
|
|
|
|
if (tb[RTA_MULTIPATH]) {
|
|
cfg->fc_mp = nla_data(tb[RTA_MULTIPATH]);
|
|
cfg->fc_mp_len = nla_len(tb[RTA_MULTIPATH]);
|
|
}
|
|
|
|
if (tb[RTA_PREF]) {
|
|
pref = nla_get_u8(tb[RTA_PREF]);
|
|
if (pref != ICMPV6_ROUTER_PREF_LOW &&
|
|
pref != ICMPV6_ROUTER_PREF_HIGH)
|
|
pref = ICMPV6_ROUTER_PREF_MEDIUM;
|
|
cfg->fc_flags |= RTF_PREF(pref);
|
|
}
|
|
|
|
if (tb[RTA_ENCAP])
|
|
cfg->fc_encap = tb[RTA_ENCAP];
|
|
|
|
if (tb[RTA_ENCAP_TYPE])
|
|
cfg->fc_encap_type = nla_get_u16(tb[RTA_ENCAP_TYPE]);
|
|
|
|
if (tb[RTA_EXPIRES]) {
|
|
unsigned long timeout = addrconf_timeout_fixup(nla_get_u32(tb[RTA_EXPIRES]), HZ);
|
|
|
|
if (addrconf_finite_timeout(timeout)) {
|
|
cfg->fc_expires = jiffies_to_clock_t(timeout * HZ);
|
|
cfg->fc_flags |= RTF_EXPIRES;
|
|
}
|
|
}
|
|
|
|
err = 0;
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
struct rt6_nh {
|
|
struct rt6_info *rt6_info;
|
|
struct fib6_config r_cfg;
|
|
struct mx6_config mxc;
|
|
struct list_head next;
|
|
};
|
|
|
|
static void ip6_print_replace_route_err(struct list_head *rt6_nh_list)
|
|
{
|
|
struct rt6_nh *nh;
|
|
|
|
list_for_each_entry(nh, rt6_nh_list, next) {
|
|
pr_warn("IPV6: multipath route replace failed (check consistency of installed routes): %pI6 nexthop %pI6 ifi %d\n",
|
|
&nh->r_cfg.fc_dst, &nh->r_cfg.fc_gateway,
|
|
nh->r_cfg.fc_ifindex);
|
|
}
|
|
}
|
|
|
|
static int ip6_route_info_append(struct list_head *rt6_nh_list,
|
|
struct rt6_info *rt, struct fib6_config *r_cfg)
|
|
{
|
|
struct rt6_nh *nh;
|
|
struct rt6_info *rtnh;
|
|
int err = -EEXIST;
|
|
|
|
list_for_each_entry(nh, rt6_nh_list, next) {
|
|
/* check if rt6_info already exists */
|
|
rtnh = nh->rt6_info;
|
|
|
|
if (rtnh->dst.dev == rt->dst.dev &&
|
|
rtnh->rt6i_idev == rt->rt6i_idev &&
|
|
ipv6_addr_equal(&rtnh->rt6i_gateway,
|
|
&rt->rt6i_gateway))
|
|
return err;
|
|
}
|
|
|
|
nh = kzalloc(sizeof(*nh), GFP_KERNEL);
|
|
if (!nh)
|
|
return -ENOMEM;
|
|
nh->rt6_info = rt;
|
|
err = ip6_convert_metrics(&nh->mxc, r_cfg);
|
|
if (err) {
|
|
kfree(nh);
|
|
return err;
|
|
}
|
|
memcpy(&nh->r_cfg, r_cfg, sizeof(*r_cfg));
|
|
list_add_tail(&nh->next, rt6_nh_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_route_multipath_add(struct fib6_config *cfg)
|
|
{
|
|
struct fib6_config r_cfg;
|
|
struct rtnexthop *rtnh;
|
|
struct rt6_info *rt;
|
|
struct rt6_nh *err_nh;
|
|
struct rt6_nh *nh, *nh_safe;
|
|
int remaining;
|
|
int attrlen;
|
|
int err = 1;
|
|
int nhn = 0;
|
|
int replace = (cfg->fc_nlinfo.nlh &&
|
|
(cfg->fc_nlinfo.nlh->nlmsg_flags & NLM_F_REPLACE));
|
|
LIST_HEAD(rt6_nh_list);
|
|
|
|
remaining = cfg->fc_mp_len;
|
|
rtnh = (struct rtnexthop *)cfg->fc_mp;
|
|
|
|
/* Parse a Multipath Entry and build a list (rt6_nh_list) of
|
|
* rt6_info structs per nexthop
|
|
*/
|
|
while (rtnh_ok(rtnh, remaining)) {
|
|
memcpy(&r_cfg, cfg, sizeof(*cfg));
|
|
if (rtnh->rtnh_ifindex)
|
|
r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
|
|
|
|
attrlen = rtnh_attrlen(rtnh);
|
|
if (attrlen > 0) {
|
|
struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
|
|
|
|
nla = nla_find(attrs, attrlen, RTA_GATEWAY);
|
|
if (nla) {
|
|
r_cfg.fc_gateway = nla_get_in6_addr(nla);
|
|
r_cfg.fc_flags |= RTF_GATEWAY;
|
|
}
|
|
r_cfg.fc_encap = nla_find(attrs, attrlen, RTA_ENCAP);
|
|
nla = nla_find(attrs, attrlen, RTA_ENCAP_TYPE);
|
|
if (nla)
|
|
r_cfg.fc_encap_type = nla_get_u16(nla);
|
|
}
|
|
|
|
rt = ip6_route_info_create(&r_cfg);
|
|
if (IS_ERR(rt)) {
|
|
err = PTR_ERR(rt);
|
|
rt = NULL;
|
|
goto cleanup;
|
|
}
|
|
|
|
err = ip6_route_info_append(&rt6_nh_list, rt, &r_cfg);
|
|
if (err) {
|
|
dst_free(&rt->dst);
|
|
goto cleanup;
|
|
}
|
|
|
|
rtnh = rtnh_next(rtnh, &remaining);
|
|
}
|
|
|
|
err_nh = NULL;
|
|
list_for_each_entry(nh, &rt6_nh_list, next) {
|
|
err = __ip6_ins_rt(nh->rt6_info, &cfg->fc_nlinfo, &nh->mxc);
|
|
/* nh->rt6_info is used or freed at this point, reset to NULL*/
|
|
nh->rt6_info = NULL;
|
|
if (err) {
|
|
if (replace && nhn)
|
|
ip6_print_replace_route_err(&rt6_nh_list);
|
|
err_nh = nh;
|
|
goto add_errout;
|
|
}
|
|
|
|
/* Because each route is added like a single route we remove
|
|
* these flags after the first nexthop: if there is a collision,
|
|
* we have already failed to add the first nexthop:
|
|
* fib6_add_rt2node() has rejected it; when replacing, old
|
|
* nexthops have been replaced by first new, the rest should
|
|
* be added to it.
|
|
*/
|
|
cfg->fc_nlinfo.nlh->nlmsg_flags &= ~(NLM_F_EXCL |
|
|
NLM_F_REPLACE);
|
|
nhn++;
|
|
}
|
|
|
|
goto cleanup;
|
|
|
|
add_errout:
|
|
/* Delete routes that were already added */
|
|
list_for_each_entry(nh, &rt6_nh_list, next) {
|
|
if (err_nh == nh)
|
|
break;
|
|
ip6_route_del(&nh->r_cfg);
|
|
}
|
|
|
|
cleanup:
|
|
list_for_each_entry_safe(nh, nh_safe, &rt6_nh_list, next) {
|
|
if (nh->rt6_info)
|
|
dst_free(&nh->rt6_info->dst);
|
|
kfree(nh->mxc.mx);
|
|
list_del(&nh->next);
|
|
kfree(nh);
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ip6_route_multipath_del(struct fib6_config *cfg)
|
|
{
|
|
struct fib6_config r_cfg;
|
|
struct rtnexthop *rtnh;
|
|
int remaining;
|
|
int attrlen;
|
|
int err = 1, last_err = 0;
|
|
|
|
remaining = cfg->fc_mp_len;
|
|
rtnh = (struct rtnexthop *)cfg->fc_mp;
|
|
|
|
/* Parse a Multipath Entry */
|
|
while (rtnh_ok(rtnh, remaining)) {
|
|
memcpy(&r_cfg, cfg, sizeof(*cfg));
|
|
if (rtnh->rtnh_ifindex)
|
|
r_cfg.fc_ifindex = rtnh->rtnh_ifindex;
|
|
|
|
attrlen = rtnh_attrlen(rtnh);
|
|
if (attrlen > 0) {
|
|
struct nlattr *nla, *attrs = rtnh_attrs(rtnh);
|
|
|
|
nla = nla_find(attrs, attrlen, RTA_GATEWAY);
|
|
if (nla) {
|
|
nla_memcpy(&r_cfg.fc_gateway, nla, 16);
|
|
r_cfg.fc_flags |= RTF_GATEWAY;
|
|
}
|
|
}
|
|
err = ip6_route_del(&r_cfg);
|
|
if (err)
|
|
last_err = err;
|
|
|
|
rtnh = rtnh_next(rtnh, &remaining);
|
|
}
|
|
|
|
return last_err;
|
|
}
|
|
|
|
static int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct fib6_config cfg;
|
|
int err;
|
|
|
|
err = rtm_to_fib6_config(skb, nlh, &cfg);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cfg.fc_mp)
|
|
return ip6_route_multipath_del(&cfg);
|
|
else
|
|
return ip6_route_del(&cfg);
|
|
}
|
|
|
|
static int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct fib6_config cfg;
|
|
int err;
|
|
|
|
err = rtm_to_fib6_config(skb, nlh, &cfg);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (cfg.fc_mp)
|
|
return ip6_route_multipath_add(&cfg);
|
|
else
|
|
return ip6_route_add(&cfg);
|
|
}
|
|
|
|
static inline size_t rt6_nlmsg_size(struct rt6_info *rt)
|
|
{
|
|
return NLMSG_ALIGN(sizeof(struct rtmsg))
|
|
+ nla_total_size(16) /* RTA_SRC */
|
|
+ nla_total_size(16) /* RTA_DST */
|
|
+ nla_total_size(16) /* RTA_GATEWAY */
|
|
+ nla_total_size(16) /* RTA_PREFSRC */
|
|
+ nla_total_size(4) /* RTA_TABLE */
|
|
+ nla_total_size(4) /* RTA_IIF */
|
|
+ nla_total_size(4) /* RTA_OIF */
|
|
+ nla_total_size(4) /* RTA_PRIORITY */
|
|
+ RTAX_MAX * nla_total_size(4) /* RTA_METRICS */
|
|
+ nla_total_size(sizeof(struct rta_cacheinfo))
|
|
+ nla_total_size(TCP_CA_NAME_MAX) /* RTAX_CC_ALGO */
|
|
+ nla_total_size(1) /* RTA_PREF */
|
|
+ lwtunnel_get_encap_size(rt->dst.lwtstate);
|
|
}
|
|
|
|
static int rt6_fill_node(struct net *net,
|
|
struct sk_buff *skb, struct rt6_info *rt,
|
|
struct in6_addr *dst, struct in6_addr *src,
|
|
int iif, int type, u32 portid, u32 seq,
|
|
int prefix, int nowait, unsigned int flags)
|
|
{
|
|
u32 metrics[RTAX_MAX];
|
|
struct rtmsg *rtm;
|
|
struct nlmsghdr *nlh;
|
|
long expires;
|
|
u32 table;
|
|
|
|
if (prefix) { /* user wants prefix routes only */
|
|
if (!(rt->rt6i_flags & RTF_PREFIX_RT)) {
|
|
/* success since this is not a prefix route */
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, type, sizeof(*rtm), flags);
|
|
if (!nlh)
|
|
return -EMSGSIZE;
|
|
|
|
rtm = nlmsg_data(nlh);
|
|
rtm->rtm_family = AF_INET6;
|
|
rtm->rtm_dst_len = rt->rt6i_dst.plen;
|
|
rtm->rtm_src_len = rt->rt6i_src.plen;
|
|
rtm->rtm_tos = 0;
|
|
if (rt->rt6i_table)
|
|
table = rt->rt6i_table->tb6_id;
|
|
else
|
|
table = RT6_TABLE_UNSPEC;
|
|
rtm->rtm_table = table;
|
|
if (nla_put_u32(skb, RTA_TABLE, table))
|
|
goto nla_put_failure;
|
|
if (rt->rt6i_flags & RTF_REJECT) {
|
|
switch (rt->dst.error) {
|
|
case -EINVAL:
|
|
rtm->rtm_type = RTN_BLACKHOLE;
|
|
break;
|
|
case -EACCES:
|
|
rtm->rtm_type = RTN_PROHIBIT;
|
|
break;
|
|
case -EAGAIN:
|
|
rtm->rtm_type = RTN_THROW;
|
|
break;
|
|
default:
|
|
rtm->rtm_type = RTN_UNREACHABLE;
|
|
break;
|
|
}
|
|
}
|
|
else if (rt->rt6i_flags & RTF_LOCAL)
|
|
rtm->rtm_type = RTN_LOCAL;
|
|
else if (rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
|
|
rtm->rtm_type = RTN_LOCAL;
|
|
else
|
|
rtm->rtm_type = RTN_UNICAST;
|
|
rtm->rtm_flags = 0;
|
|
if (!netif_carrier_ok(rt->dst.dev)) {
|
|
rtm->rtm_flags |= RTNH_F_LINKDOWN;
|
|
if (rt->rt6i_idev->cnf.ignore_routes_with_linkdown)
|
|
rtm->rtm_flags |= RTNH_F_DEAD;
|
|
}
|
|
rtm->rtm_scope = RT_SCOPE_UNIVERSE;
|
|
rtm->rtm_protocol = rt->rt6i_protocol;
|
|
if (rt->rt6i_flags & RTF_DYNAMIC)
|
|
rtm->rtm_protocol = RTPROT_REDIRECT;
|
|
else if (rt->rt6i_flags & RTF_ADDRCONF) {
|
|
if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ROUTEINFO))
|
|
rtm->rtm_protocol = RTPROT_RA;
|
|
else
|
|
rtm->rtm_protocol = RTPROT_KERNEL;
|
|
}
|
|
|
|
if (rt->rt6i_flags & RTF_CACHE)
|
|
rtm->rtm_flags |= RTM_F_CLONED;
|
|
|
|
if (dst) {
|
|
if (nla_put_in6_addr(skb, RTA_DST, dst))
|
|
goto nla_put_failure;
|
|
rtm->rtm_dst_len = 128;
|
|
} else if (rtm->rtm_dst_len)
|
|
if (nla_put_in6_addr(skb, RTA_DST, &rt->rt6i_dst.addr))
|
|
goto nla_put_failure;
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (src) {
|
|
if (nla_put_in6_addr(skb, RTA_SRC, src))
|
|
goto nla_put_failure;
|
|
rtm->rtm_src_len = 128;
|
|
} else if (rtm->rtm_src_len &&
|
|
nla_put_in6_addr(skb, RTA_SRC, &rt->rt6i_src.addr))
|
|
goto nla_put_failure;
|
|
#endif
|
|
if (iif) {
|
|
#ifdef CONFIG_IPV6_MROUTE
|
|
if (ipv6_addr_is_multicast(&rt->rt6i_dst.addr)) {
|
|
int err = ip6mr_get_route(net, skb, rtm, nowait,
|
|
portid);
|
|
|
|
if (err <= 0) {
|
|
if (!nowait) {
|
|
if (err == 0)
|
|
return 0;
|
|
goto nla_put_failure;
|
|
} else {
|
|
if (err == -EMSGSIZE)
|
|
goto nla_put_failure;
|
|
}
|
|
}
|
|
} else
|
|
#endif
|
|
if (nla_put_u32(skb, RTA_IIF, iif))
|
|
goto nla_put_failure;
|
|
} else if (dst) {
|
|
struct in6_addr saddr_buf;
|
|
if (ip6_route_get_saddr(net, rt, dst, 0, &saddr_buf) == 0 &&
|
|
nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (rt->rt6i_prefsrc.plen) {
|
|
struct in6_addr saddr_buf;
|
|
saddr_buf = rt->rt6i_prefsrc.addr;
|
|
if (nla_put_in6_addr(skb, RTA_PREFSRC, &saddr_buf))
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics));
|
|
if (rt->rt6i_pmtu)
|
|
metrics[RTAX_MTU - 1] = rt->rt6i_pmtu;
|
|
if (rtnetlink_put_metrics(skb, metrics) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (rt->rt6i_flags & RTF_GATEWAY) {
|
|
if (nla_put_in6_addr(skb, RTA_GATEWAY, &rt->rt6i_gateway) < 0)
|
|
goto nla_put_failure;
|
|
}
|
|
|
|
if (rt->dst.dev &&
|
|
nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex))
|
|
goto nla_put_failure;
|
|
if (nla_put_u32(skb, RTA_PRIORITY, rt->rt6i_metric))
|
|
goto nla_put_failure;
|
|
|
|
expires = (rt->rt6i_flags & RTF_EXPIRES) ? rt->dst.expires - jiffies : 0;
|
|
|
|
if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, rt->dst.error) < 0)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u8(skb, RTA_PREF, IPV6_EXTRACT_PREF(rt->rt6i_flags)))
|
|
goto nla_put_failure;
|
|
|
|
lwtunnel_fill_encap(skb, rt->dst.lwtstate);
|
|
|
|
nlmsg_end(skb, nlh);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
int rt6_dump_route(struct rt6_info *rt, void *p_arg)
|
|
{
|
|
struct rt6_rtnl_dump_arg *arg = (struct rt6_rtnl_dump_arg *) p_arg;
|
|
int prefix;
|
|
|
|
if (nlmsg_len(arg->cb->nlh) >= sizeof(struct rtmsg)) {
|
|
struct rtmsg *rtm = nlmsg_data(arg->cb->nlh);
|
|
prefix = (rtm->rtm_flags & RTM_F_PREFIX) != 0;
|
|
} else
|
|
prefix = 0;
|
|
|
|
return rt6_fill_node(arg->net,
|
|
arg->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
|
|
NETLINK_CB(arg->cb->skb).portid, arg->cb->nlh->nlmsg_seq,
|
|
prefix, 0, NLM_F_MULTI);
|
|
}
|
|
|
|
static int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh)
|
|
{
|
|
struct net *net = sock_net(in_skb->sk);
|
|
struct nlattr *tb[RTA_MAX+1];
|
|
struct rt6_info *rt;
|
|
struct sk_buff *skb;
|
|
struct rtmsg *rtm;
|
|
struct flowi6 fl6;
|
|
int err, iif = 0, oif = 0;
|
|
|
|
err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, rtm_ipv6_policy);
|
|
if (err < 0)
|
|
goto errout;
|
|
|
|
err = -EINVAL;
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
rtm = nlmsg_data(nlh);
|
|
fl6.flowlabel = ip6_make_flowinfo(rtm->rtm_tos, 0);
|
|
|
|
if (tb[RTA_SRC]) {
|
|
if (nla_len(tb[RTA_SRC]) < sizeof(struct in6_addr))
|
|
goto errout;
|
|
|
|
fl6.saddr = *(struct in6_addr *)nla_data(tb[RTA_SRC]);
|
|
}
|
|
|
|
if (tb[RTA_DST]) {
|
|
if (nla_len(tb[RTA_DST]) < sizeof(struct in6_addr))
|
|
goto errout;
|
|
|
|
fl6.daddr = *(struct in6_addr *)nla_data(tb[RTA_DST]);
|
|
}
|
|
|
|
if (tb[RTA_IIF])
|
|
iif = nla_get_u32(tb[RTA_IIF]);
|
|
|
|
if (tb[RTA_OIF])
|
|
oif = nla_get_u32(tb[RTA_OIF]);
|
|
|
|
if (tb[RTA_MARK])
|
|
fl6.flowi6_mark = nla_get_u32(tb[RTA_MARK]);
|
|
|
|
if (iif) {
|
|
struct net_device *dev;
|
|
int flags = 0;
|
|
|
|
dev = __dev_get_by_index(net, iif);
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto errout;
|
|
}
|
|
|
|
fl6.flowi6_iif = iif;
|
|
|
|
if (!ipv6_addr_any(&fl6.saddr))
|
|
flags |= RT6_LOOKUP_F_HAS_SADDR;
|
|
|
|
rt = (struct rt6_info *)ip6_route_input_lookup(net, dev, &fl6,
|
|
flags);
|
|
} else {
|
|
fl6.flowi6_oif = oif;
|
|
|
|
rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
|
|
}
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!skb) {
|
|
ip6_rt_put(rt);
|
|
err = -ENOBUFS;
|
|
goto errout;
|
|
}
|
|
|
|
/* Reserve room for dummy headers, this skb can pass
|
|
through good chunk of routing engine.
|
|
*/
|
|
skb_reset_mac_header(skb);
|
|
skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
|
|
|
|
skb_dst_set(skb, &rt->dst);
|
|
|
|
err = rt6_fill_node(net, skb, rt, &fl6.daddr, &fl6.saddr, iif,
|
|
RTM_NEWROUTE, NETLINK_CB(in_skb).portid,
|
|
nlh->nlmsg_seq, 0, 0, 0);
|
|
if (err < 0) {
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
|
|
err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
|
|
errout:
|
|
return err;
|
|
}
|
|
|
|
void inet6_rt_notify(int event, struct rt6_info *rt, struct nl_info *info,
|
|
unsigned int nlm_flags)
|
|
{
|
|
struct sk_buff *skb;
|
|
struct net *net = info->nl_net;
|
|
u32 seq;
|
|
int err;
|
|
|
|
err = -ENOBUFS;
|
|
seq = info->nlh ? info->nlh->nlmsg_seq : 0;
|
|
|
|
skb = nlmsg_new(rt6_nlmsg_size(rt), gfp_any());
|
|
if (!skb)
|
|
goto errout;
|
|
|
|
err = rt6_fill_node(net, skb, rt, NULL, NULL, 0,
|
|
event, info->portid, seq, 0, 0, nlm_flags);
|
|
if (err < 0) {
|
|
/* -EMSGSIZE implies BUG in rt6_nlmsg_size() */
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(skb);
|
|
goto errout;
|
|
}
|
|
rtnl_notify(skb, net, info->portid, RTNLGRP_IPV6_ROUTE,
|
|
info->nlh, gfp_any());
|
|
return;
|
|
errout:
|
|
if (err < 0)
|
|
rtnl_set_sk_err(net, RTNLGRP_IPV6_ROUTE, err);
|
|
}
|
|
|
|
static int ip6_route_dev_notify(struct notifier_block *this,
|
|
unsigned long event, void *ptr)
|
|
{
|
|
struct net_device *dev = netdev_notifier_info_to_dev(ptr);
|
|
struct net *net = dev_net(dev);
|
|
|
|
if (event == NETDEV_REGISTER && (dev->flags & IFF_LOOPBACK)) {
|
|
net->ipv6.ip6_null_entry->dst.dev = dev;
|
|
net->ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(dev);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
net->ipv6.ip6_prohibit_entry->dst.dev = dev;
|
|
net->ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(dev);
|
|
net->ipv6.ip6_blk_hole_entry->dst.dev = dev;
|
|
net->ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(dev);
|
|
#endif
|
|
}
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/*
|
|
* /proc
|
|
*/
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static const struct file_operations ipv6_route_proc_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = ipv6_route_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net,
|
|
};
|
|
|
|
static int rt6_stats_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
struct net *net = (struct net *)seq->private;
|
|
seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
|
|
net->ipv6.rt6_stats->fib_nodes,
|
|
net->ipv6.rt6_stats->fib_route_nodes,
|
|
net->ipv6.rt6_stats->fib_rt_alloc,
|
|
net->ipv6.rt6_stats->fib_rt_entries,
|
|
net->ipv6.rt6_stats->fib_rt_cache,
|
|
dst_entries_get_slow(&net->ipv6.ip6_dst_ops),
|
|
net->ipv6.rt6_stats->fib_discarded_routes);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rt6_stats_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open_net(inode, file, rt6_stats_seq_show);
|
|
}
|
|
|
|
static const struct file_operations rt6_stats_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rt6_stats_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release_net,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
static
|
|
int ipv6_sysctl_rtcache_flush(struct ctl_table *ctl, int write,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
struct net *net;
|
|
int delay;
|
|
if (!write)
|
|
return -EINVAL;
|
|
|
|
net = (struct net *)ctl->extra1;
|
|
delay = net->ipv6.sysctl.flush_delay;
|
|
proc_dointvec(ctl, write, buffer, lenp, ppos);
|
|
fib6_run_gc(delay <= 0 ? 0 : (unsigned long)delay, net, delay > 0);
|
|
return 0;
|
|
}
|
|
|
|
struct ctl_table ipv6_route_table_template[] = {
|
|
{
|
|
.procname = "flush",
|
|
.data = &init_net.ipv6.sysctl.flush_delay,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0200,
|
|
.proc_handler = ipv6_sysctl_rtcache_flush
|
|
},
|
|
{
|
|
.procname = "gc_thresh",
|
|
.data = &ip6_dst_ops_template.gc_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "max_size",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_max_size,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "gc_min_interval",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "gc_timeout",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "gc_interval",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "gc_elasticity",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_elasticity,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "mtu_expires",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_mtu_expires,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "min_adv_mss",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_min_advmss,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{
|
|
.procname = "gc_min_interval_ms",
|
|
.data = &init_net.ipv6.sysctl.ip6_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_ms_jiffies,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
struct ctl_table * __net_init ipv6_route_sysctl_init(struct net *net)
|
|
{
|
|
struct ctl_table *table;
|
|
|
|
table = kmemdup(ipv6_route_table_template,
|
|
sizeof(ipv6_route_table_template),
|
|
GFP_KERNEL);
|
|
|
|
if (table) {
|
|
table[0].data = &net->ipv6.sysctl.flush_delay;
|
|
table[0].extra1 = net;
|
|
table[1].data = &net->ipv6.ip6_dst_ops.gc_thresh;
|
|
table[2].data = &net->ipv6.sysctl.ip6_rt_max_size;
|
|
table[3].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
|
|
table[4].data = &net->ipv6.sysctl.ip6_rt_gc_timeout;
|
|
table[5].data = &net->ipv6.sysctl.ip6_rt_gc_interval;
|
|
table[6].data = &net->ipv6.sysctl.ip6_rt_gc_elasticity;
|
|
table[7].data = &net->ipv6.sysctl.ip6_rt_mtu_expires;
|
|
table[8].data = &net->ipv6.sysctl.ip6_rt_min_advmss;
|
|
table[9].data = &net->ipv6.sysctl.ip6_rt_gc_min_interval;
|
|
|
|
/* Don't export sysctls to unprivileged users */
|
|
if (net->user_ns != &init_user_ns)
|
|
table[0].procname = NULL;
|
|
}
|
|
|
|
return table;
|
|
}
|
|
#endif
|
|
|
|
static int __net_init ip6_route_net_init(struct net *net)
|
|
{
|
|
int ret = -ENOMEM;
|
|
|
|
memcpy(&net->ipv6.ip6_dst_ops, &ip6_dst_ops_template,
|
|
sizeof(net->ipv6.ip6_dst_ops));
|
|
|
|
if (dst_entries_init(&net->ipv6.ip6_dst_ops) < 0)
|
|
goto out_ip6_dst_ops;
|
|
|
|
net->ipv6.ip6_null_entry = kmemdup(&ip6_null_entry_template,
|
|
sizeof(*net->ipv6.ip6_null_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_null_entry)
|
|
goto out_ip6_dst_entries;
|
|
net->ipv6.ip6_null_entry->dst.path =
|
|
(struct dst_entry *)net->ipv6.ip6_null_entry;
|
|
net->ipv6.ip6_null_entry->dst.ops = &net->ipv6.ip6_dst_ops;
|
|
dst_init_metrics(&net->ipv6.ip6_null_entry->dst,
|
|
ip6_template_metrics, true);
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
net->ipv6.ip6_prohibit_entry = kmemdup(&ip6_prohibit_entry_template,
|
|
sizeof(*net->ipv6.ip6_prohibit_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_prohibit_entry)
|
|
goto out_ip6_null_entry;
|
|
net->ipv6.ip6_prohibit_entry->dst.path =
|
|
(struct dst_entry *)net->ipv6.ip6_prohibit_entry;
|
|
net->ipv6.ip6_prohibit_entry->dst.ops = &net->ipv6.ip6_dst_ops;
|
|
dst_init_metrics(&net->ipv6.ip6_prohibit_entry->dst,
|
|
ip6_template_metrics, true);
|
|
|
|
net->ipv6.ip6_blk_hole_entry = kmemdup(&ip6_blk_hole_entry_template,
|
|
sizeof(*net->ipv6.ip6_blk_hole_entry),
|
|
GFP_KERNEL);
|
|
if (!net->ipv6.ip6_blk_hole_entry)
|
|
goto out_ip6_prohibit_entry;
|
|
net->ipv6.ip6_blk_hole_entry->dst.path =
|
|
(struct dst_entry *)net->ipv6.ip6_blk_hole_entry;
|
|
net->ipv6.ip6_blk_hole_entry->dst.ops = &net->ipv6.ip6_dst_ops;
|
|
dst_init_metrics(&net->ipv6.ip6_blk_hole_entry->dst,
|
|
ip6_template_metrics, true);
|
|
#endif
|
|
|
|
net->ipv6.sysctl.flush_delay = 0;
|
|
net->ipv6.sysctl.ip6_rt_max_size = 4096;
|
|
net->ipv6.sysctl.ip6_rt_gc_min_interval = HZ / 2;
|
|
net->ipv6.sysctl.ip6_rt_gc_timeout = 60*HZ;
|
|
net->ipv6.sysctl.ip6_rt_gc_interval = 30*HZ;
|
|
net->ipv6.sysctl.ip6_rt_gc_elasticity = 9;
|
|
net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
|
|
net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
|
|
|
|
net->ipv6.ip6_rt_gc_expire = 30*HZ;
|
|
|
|
ret = 0;
|
|
out:
|
|
return ret;
|
|
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
out_ip6_prohibit_entry:
|
|
kfree(net->ipv6.ip6_prohibit_entry);
|
|
out_ip6_null_entry:
|
|
kfree(net->ipv6.ip6_null_entry);
|
|
#endif
|
|
out_ip6_dst_entries:
|
|
dst_entries_destroy(&net->ipv6.ip6_dst_ops);
|
|
out_ip6_dst_ops:
|
|
goto out;
|
|
}
|
|
|
|
static void __net_exit ip6_route_net_exit(struct net *net)
|
|
{
|
|
kfree(net->ipv6.ip6_null_entry);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
kfree(net->ipv6.ip6_prohibit_entry);
|
|
kfree(net->ipv6.ip6_blk_hole_entry);
|
|
#endif
|
|
dst_entries_destroy(&net->ipv6.ip6_dst_ops);
|
|
}
|
|
|
|
static int __net_init ip6_route_net_init_late(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_create("ipv6_route", 0, net->proc_net, &ipv6_route_proc_fops);
|
|
proc_create("rt6_stats", S_IRUGO, net->proc_net, &rt6_stats_seq_fops);
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit ip6_route_net_exit_late(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
remove_proc_entry("ipv6_route", net->proc_net);
|
|
remove_proc_entry("rt6_stats", net->proc_net);
|
|
#endif
|
|
}
|
|
|
|
static struct pernet_operations ip6_route_net_ops = {
|
|
.init = ip6_route_net_init,
|
|
.exit = ip6_route_net_exit,
|
|
};
|
|
|
|
static int __net_init ipv6_inetpeer_init(struct net *net)
|
|
{
|
|
struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL);
|
|
|
|
if (!bp)
|
|
return -ENOMEM;
|
|
inet_peer_base_init(bp);
|
|
net->ipv6.peers = bp;
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit ipv6_inetpeer_exit(struct net *net)
|
|
{
|
|
struct inet_peer_base *bp = net->ipv6.peers;
|
|
|
|
net->ipv6.peers = NULL;
|
|
inetpeer_invalidate_tree(bp);
|
|
kfree(bp);
|
|
}
|
|
|
|
static struct pernet_operations ipv6_inetpeer_ops = {
|
|
.init = ipv6_inetpeer_init,
|
|
.exit = ipv6_inetpeer_exit,
|
|
};
|
|
|
|
static struct pernet_operations ip6_route_net_late_ops = {
|
|
.init = ip6_route_net_init_late,
|
|
.exit = ip6_route_net_exit_late,
|
|
};
|
|
|
|
static struct notifier_block ip6_route_dev_notifier = {
|
|
.notifier_call = ip6_route_dev_notify,
|
|
.priority = 0,
|
|
};
|
|
|
|
int __init ip6_route_init(void)
|
|
{
|
|
int ret;
|
|
int cpu;
|
|
|
|
ret = -ENOMEM;
|
|
ip6_dst_ops_template.kmem_cachep =
|
|
kmem_cache_create("ip6_dst_cache", sizeof(struct rt6_info), 0,
|
|
SLAB_HWCACHE_ALIGN, NULL);
|
|
if (!ip6_dst_ops_template.kmem_cachep)
|
|
goto out;
|
|
|
|
ret = dst_entries_init(&ip6_dst_blackhole_ops);
|
|
if (ret)
|
|
goto out_kmem_cache;
|
|
|
|
ret = register_pernet_subsys(&ipv6_inetpeer_ops);
|
|
if (ret)
|
|
goto out_dst_entries;
|
|
|
|
ret = register_pernet_subsys(&ip6_route_net_ops);
|
|
if (ret)
|
|
goto out_register_inetpeer;
|
|
|
|
ip6_dst_blackhole_ops.kmem_cachep = ip6_dst_ops_template.kmem_cachep;
|
|
|
|
/* Registering of the loopback is done before this portion of code,
|
|
* the loopback reference in rt6_info will not be taken, do it
|
|
* manually for init_net */
|
|
init_net.ipv6.ip6_null_entry->dst.dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_null_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
|
|
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
|
|
init_net.ipv6.ip6_prohibit_entry->dst.dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_prohibit_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
|
|
init_net.ipv6.ip6_blk_hole_entry->dst.dev = init_net.loopback_dev;
|
|
init_net.ipv6.ip6_blk_hole_entry->rt6i_idev = in6_dev_get(init_net.loopback_dev);
|
|
#endif
|
|
ret = fib6_init();
|
|
if (ret)
|
|
goto out_register_subsys;
|
|
|
|
ret = xfrm6_init();
|
|
if (ret)
|
|
goto out_fib6_init;
|
|
|
|
ret = fib6_rules_init();
|
|
if (ret)
|
|
goto xfrm6_init;
|
|
|
|
ret = register_pernet_subsys(&ip6_route_net_late_ops);
|
|
if (ret)
|
|
goto fib6_rules_init;
|
|
|
|
ret = -ENOBUFS;
|
|
if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
|
|
__rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
|
|
__rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
|
|
goto out_register_late_subsys;
|
|
|
|
ret = register_netdevice_notifier(&ip6_route_dev_notifier);
|
|
if (ret)
|
|
goto out_register_late_subsys;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
struct uncached_list *ul = per_cpu_ptr(&rt6_uncached_list, cpu);
|
|
|
|
INIT_LIST_HEAD(&ul->head);
|
|
spin_lock_init(&ul->lock);
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
|
|
out_register_late_subsys:
|
|
unregister_pernet_subsys(&ip6_route_net_late_ops);
|
|
fib6_rules_init:
|
|
fib6_rules_cleanup();
|
|
xfrm6_init:
|
|
xfrm6_fini();
|
|
out_fib6_init:
|
|
fib6_gc_cleanup();
|
|
out_register_subsys:
|
|
unregister_pernet_subsys(&ip6_route_net_ops);
|
|
out_register_inetpeer:
|
|
unregister_pernet_subsys(&ipv6_inetpeer_ops);
|
|
out_dst_entries:
|
|
dst_entries_destroy(&ip6_dst_blackhole_ops);
|
|
out_kmem_cache:
|
|
kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
|
|
goto out;
|
|
}
|
|
|
|
void ip6_route_cleanup(void)
|
|
{
|
|
unregister_netdevice_notifier(&ip6_route_dev_notifier);
|
|
unregister_pernet_subsys(&ip6_route_net_late_ops);
|
|
fib6_rules_cleanup();
|
|
xfrm6_fini();
|
|
fib6_gc_cleanup();
|
|
unregister_pernet_subsys(&ipv6_inetpeer_ops);
|
|
unregister_pernet_subsys(&ip6_route_net_ops);
|
|
dst_entries_destroy(&ip6_dst_blackhole_ops);
|
|
kmem_cache_destroy(ip6_dst_ops_template.kmem_cachep);
|
|
}
|