![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
Of this type, mostly: CHECK net/ipv6/netfilter.c net/ipv6/netfilter.c:96:12: warning: symbol 'ipv6_netfilter_init' was not declared. Should it be static? net/ipv6/netfilter.c:101:6: warning: symbol 'ipv6_netfilter_fini' was not declared. Should it be static? Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2135 lines
49 KiB
C
2135 lines
49 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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* $Id: route.c,v 1.56 2001/10/31 21:55:55 davem Exp $
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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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*/
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#include <linux/config.h>
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#include <linux/errno.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/init.h>
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#include <linux/netlink.h>
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#include <linux/if_arp.h>
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#ifdef CONFIG_PROC_FS
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#endif
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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/xfrm.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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/* Set to 3 to get tracing. */
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#define RT6_DEBUG 2
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#if RT6_DEBUG >= 3
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#define RDBG(x) printk x
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#define RT6_TRACE(x...) printk(KERN_DEBUG x)
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#else
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#define RDBG(x)
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#define RT6_TRACE(x...) do { ; } while (0)
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#endif
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static int ip6_rt_max_size = 4096;
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static int ip6_rt_gc_min_interval = HZ / 2;
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static int ip6_rt_gc_timeout = 60*HZ;
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int ip6_rt_gc_interval = 30*HZ;
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static int ip6_rt_gc_elasticity = 9;
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static int ip6_rt_mtu_expires = 10*60*HZ;
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static int ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
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static struct rt6_info * ip6_rt_copy(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 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(void);
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static int ip6_pkt_discard(struct sk_buff *skb);
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static int ip6_pkt_discard_out(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, u32 mtu);
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static struct dst_ops ip6_dst_ops = {
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.family = AF_INET6,
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.protocol = __constant_htons(ETH_P_IPV6),
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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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.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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.entry_size = sizeof(struct rt6_info),
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};
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struct rt6_info ip6_null_entry = {
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.u = {
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.dst = {
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.__refcnt = ATOMIC_INIT(1),
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.__use = 1,
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.dev = &loopback_dev,
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.obsolete = -1,
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.error = -ENETUNREACH,
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.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
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.input = ip6_pkt_discard,
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.output = ip6_pkt_discard_out,
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.ops = &ip6_dst_ops,
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.path = (struct dst_entry*)&ip6_null_entry,
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}
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},
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.rt6i_flags = (RTF_REJECT | RTF_NONEXTHOP),
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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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struct fib6_node ip6_routing_table = {
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.leaf = &ip6_null_entry,
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.fn_flags = RTN_ROOT | RTN_TL_ROOT | RTN_RTINFO,
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};
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/* Protects all the ip6 fib */
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DEFINE_RWLOCK(rt6_lock);
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/* allocate dst with ip6_dst_ops */
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static __inline__ struct rt6_info *ip6_dst_alloc(void)
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{
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return (struct rt6_info *)dst_alloc(&ip6_dst_ops);
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}
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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 inet6_dev *idev = rt->rt6i_idev;
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if (idev != NULL) {
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rt->rt6i_idev = NULL;
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in6_dev_put(idev);
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}
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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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if (dev != &loopback_dev && idev != NULL && idev->dev == dev) {
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struct inet6_dev *loopback_idev = in6_dev_get(&loopback_dev);
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if (loopback_idev != NULL) {
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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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static __inline__ int rt6_check_expired(const struct rt6_info *rt)
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{
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return (rt->rt6i_flags & RTF_EXPIRES &&
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time_after(jiffies, rt->rt6i_expires));
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}
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/*
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* Route lookup. Any rt6_lock is implied.
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*/
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static __inline__ struct rt6_info *rt6_device_match(struct rt6_info *rt,
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int oif,
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int strict)
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{
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struct rt6_info *local = NULL;
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struct rt6_info *sprt;
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if (oif) {
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for (sprt = rt; sprt; sprt = sprt->u.next) {
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struct net_device *dev = sprt->rt6i_dev;
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if (dev->ifindex == oif)
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return sprt;
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if (dev->flags & IFF_LOOPBACK) {
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if (sprt->rt6i_idev == NULL ||
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sprt->rt6i_idev->dev->ifindex != oif) {
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if (strict && oif)
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continue;
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if (local && (!oif ||
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local->rt6i_idev->dev->ifindex == oif))
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continue;
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}
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local = sprt;
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}
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}
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if (local)
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return local;
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if (strict)
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return &ip6_null_entry;
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}
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return rt;
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}
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/*
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* pointer to the last default router chosen. BH is disabled locally.
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*/
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static struct rt6_info *rt6_dflt_pointer;
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static DEFINE_SPINLOCK(rt6_dflt_lock);
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void rt6_reset_dflt_pointer(struct rt6_info *rt)
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{
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spin_lock_bh(&rt6_dflt_lock);
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if (rt == NULL || rt == rt6_dflt_pointer) {
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RT6_TRACE("reset default router: %p->NULL\n", rt6_dflt_pointer);
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rt6_dflt_pointer = NULL;
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}
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spin_unlock_bh(&rt6_dflt_lock);
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}
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/* Default Router Selection (RFC 2461 6.3.6) */
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static struct rt6_info *rt6_best_dflt(struct rt6_info *rt, int oif)
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{
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struct rt6_info *match = NULL;
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struct rt6_info *sprt;
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int mpri = 0;
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for (sprt = rt; sprt; sprt = sprt->u.next) {
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struct neighbour *neigh;
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int m = 0;
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if (!oif ||
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(sprt->rt6i_dev &&
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sprt->rt6i_dev->ifindex == oif))
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m += 8;
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if (rt6_check_expired(sprt))
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continue;
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if (sprt == rt6_dflt_pointer)
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m += 4;
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if ((neigh = sprt->rt6i_nexthop) != NULL) {
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read_lock_bh(&neigh->lock);
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switch (neigh->nud_state) {
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case NUD_REACHABLE:
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m += 3;
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break;
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case NUD_STALE:
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case NUD_DELAY:
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case NUD_PROBE:
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m += 2;
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break;
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case NUD_NOARP:
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case NUD_PERMANENT:
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m += 1;
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break;
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case NUD_INCOMPLETE:
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default:
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read_unlock_bh(&neigh->lock);
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continue;
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}
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read_unlock_bh(&neigh->lock);
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} else {
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continue;
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}
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if (m > mpri || m >= 12) {
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match = sprt;
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mpri = m;
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if (m >= 12) {
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/* we choose the last default router if it
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* is in (probably) reachable state.
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* If route changed, we should do pmtu
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* discovery. --yoshfuji
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*/
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break;
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}
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}
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}
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spin_lock(&rt6_dflt_lock);
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if (!match) {
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/*
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* No default routers are known to be reachable.
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* SHOULD round robin
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*/
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if (rt6_dflt_pointer) {
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for (sprt = rt6_dflt_pointer->u.next;
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sprt; sprt = sprt->u.next) {
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if (sprt->u.dst.obsolete <= 0 &&
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sprt->u.dst.error == 0 &&
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!rt6_check_expired(sprt)) {
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match = sprt;
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break;
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}
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}
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for (sprt = rt;
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!match && sprt;
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sprt = sprt->u.next) {
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if (sprt->u.dst.obsolete <= 0 &&
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sprt->u.dst.error == 0 &&
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!rt6_check_expired(sprt)) {
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match = sprt;
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break;
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}
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if (sprt == rt6_dflt_pointer)
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break;
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}
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}
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}
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if (match) {
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if (rt6_dflt_pointer != match)
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RT6_TRACE("changed default router: %p->%p\n",
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rt6_dflt_pointer, match);
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rt6_dflt_pointer = match;
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}
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spin_unlock(&rt6_dflt_lock);
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if (!match) {
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/*
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* Last Resort: if no default routers found,
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* use addrconf default route.
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* We don't record this route.
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*/
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for (sprt = ip6_routing_table.leaf;
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sprt; sprt = sprt->u.next) {
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if (!rt6_check_expired(sprt) &&
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(sprt->rt6i_flags & RTF_DEFAULT) &&
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(!oif ||
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(sprt->rt6i_dev &&
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sprt->rt6i_dev->ifindex == oif))) {
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match = sprt;
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break;
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}
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}
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if (!match) {
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/* no default route. give up. */
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match = &ip6_null_entry;
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}
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}
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return match;
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}
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struct rt6_info *rt6_lookup(struct in6_addr *daddr, struct in6_addr *saddr,
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int oif, int strict)
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{
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struct fib6_node *fn;
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struct rt6_info *rt;
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read_lock_bh(&rt6_lock);
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fn = fib6_lookup(&ip6_routing_table, daddr, saddr);
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rt = rt6_device_match(fn->leaf, oif, strict);
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dst_hold(&rt->u.dst);
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rt->u.dst.__use++;
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read_unlock_bh(&rt6_lock);
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rt->u.dst.lastuse = jiffies;
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if (rt->u.dst.error == 0)
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return rt;
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dst_release(&rt->u.dst);
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return NULL;
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}
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/* ip6_ins_rt is called with FREE rt6_lock.
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It takes new route entry, the addition fails by any reason the
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route is freed. In any case, if caller does not hold it, it may
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be destroyed.
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*/
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int ip6_ins_rt(struct rt6_info *rt, struct nlmsghdr *nlh,
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void *_rtattr, struct netlink_skb_parms *req)
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{
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int err;
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write_lock_bh(&rt6_lock);
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err = fib6_add(&ip6_routing_table, rt, nlh, _rtattr, req);
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write_unlock_bh(&rt6_lock);
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return err;
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}
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|
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/* No rt6_lock! If COW failed, the function returns dead route entry
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with dst->error set to errno value.
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*/
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static struct rt6_info *rt6_cow(struct rt6_info *ort, struct in6_addr *daddr,
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struct in6_addr *saddr, struct netlink_skb_parms *req)
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{
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int err;
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struct rt6_info *rt;
|
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|
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/*
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* Clone the route.
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*/
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rt = ip6_rt_copy(ort);
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if (rt) {
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ipv6_addr_copy(&rt->rt6i_dst.addr, daddr);
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if (!(rt->rt6i_flags&RTF_GATEWAY))
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ipv6_addr_copy(&rt->rt6i_gateway, daddr);
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|
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rt->rt6i_dst.plen = 128;
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rt->rt6i_flags |= RTF_CACHE;
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rt->u.dst.flags |= DST_HOST;
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|
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#ifdef CONFIG_IPV6_SUBTREES
|
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if (rt->rt6i_src.plen && saddr) {
|
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ipv6_addr_copy(&rt->rt6i_src.addr, saddr);
|
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rt->rt6i_src.plen = 128;
|
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}
|
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#endif
|
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|
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rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
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|
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dst_hold(&rt->u.dst);
|
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|
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err = ip6_ins_rt(rt, NULL, NULL, req);
|
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if (err == 0)
|
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return rt;
|
|
|
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rt->u.dst.error = err;
|
|
|
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return rt;
|
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}
|
|
dst_hold(&ip6_null_entry.u.dst);
|
|
return &ip6_null_entry;
|
|
}
|
|
|
|
#define BACKTRACK() \
|
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if (rt == &ip6_null_entry && strict) { \
|
|
while ((fn = fn->parent) != NULL) { \
|
|
if (fn->fn_flags & RTN_ROOT) { \
|
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dst_hold(&rt->u.dst); \
|
|
goto out; \
|
|
} \
|
|
if (fn->fn_flags & RTN_RTINFO) \
|
|
goto restart; \
|
|
} \
|
|
}
|
|
|
|
|
|
void ip6_route_input(struct sk_buff *skb)
|
|
{
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt;
|
|
int strict;
|
|
int attempts = 3;
|
|
|
|
strict = ipv6_addr_type(&skb->nh.ipv6h->daddr) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL);
|
|
|
|
relookup:
|
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read_lock_bh(&rt6_lock);
|
|
|
|
fn = fib6_lookup(&ip6_routing_table, &skb->nh.ipv6h->daddr,
|
|
&skb->nh.ipv6h->saddr);
|
|
|
|
restart:
|
|
rt = fn->leaf;
|
|
|
|
if ((rt->rt6i_flags & RTF_CACHE)) {
|
|
rt = rt6_device_match(rt, skb->dev->ifindex, strict);
|
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BACKTRACK();
|
|
dst_hold(&rt->u.dst);
|
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goto out;
|
|
}
|
|
|
|
rt = rt6_device_match(rt, skb->dev->ifindex, 0);
|
|
BACKTRACK();
|
|
|
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if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
|
|
struct rt6_info *nrt;
|
|
dst_hold(&rt->u.dst);
|
|
read_unlock_bh(&rt6_lock);
|
|
|
|
nrt = rt6_cow(rt, &skb->nh.ipv6h->daddr,
|
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&skb->nh.ipv6h->saddr,
|
|
&NETLINK_CB(skb));
|
|
|
|
dst_release(&rt->u.dst);
|
|
rt = nrt;
|
|
|
|
if (rt->u.dst.error != -EEXIST || --attempts <= 0)
|
|
goto out2;
|
|
|
|
/* Race condition! In the gap, when rt6_lock was
|
|
released someone could insert this route. Relookup.
|
|
*/
|
|
dst_release(&rt->u.dst);
|
|
goto relookup;
|
|
}
|
|
dst_hold(&rt->u.dst);
|
|
|
|
out:
|
|
read_unlock_bh(&rt6_lock);
|
|
out2:
|
|
rt->u.dst.lastuse = jiffies;
|
|
rt->u.dst.__use++;
|
|
skb->dst = (struct dst_entry *) rt;
|
|
}
|
|
|
|
struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
|
|
{
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt;
|
|
int strict;
|
|
int attempts = 3;
|
|
|
|
strict = ipv6_addr_type(&fl->fl6_dst) & (IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL);
|
|
|
|
relookup:
|
|
read_lock_bh(&rt6_lock);
|
|
|
|
fn = fib6_lookup(&ip6_routing_table, &fl->fl6_dst, &fl->fl6_src);
|
|
|
|
restart:
|
|
rt = fn->leaf;
|
|
|
|
if ((rt->rt6i_flags & RTF_CACHE)) {
|
|
rt = rt6_device_match(rt, fl->oif, strict);
|
|
BACKTRACK();
|
|
dst_hold(&rt->u.dst);
|
|
goto out;
|
|
}
|
|
if (rt->rt6i_flags & RTF_DEFAULT) {
|
|
if (rt->rt6i_metric >= IP6_RT_PRIO_ADDRCONF)
|
|
rt = rt6_best_dflt(rt, fl->oif);
|
|
} else {
|
|
rt = rt6_device_match(rt, fl->oif, strict);
|
|
BACKTRACK();
|
|
}
|
|
|
|
if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
|
|
struct rt6_info *nrt;
|
|
dst_hold(&rt->u.dst);
|
|
read_unlock_bh(&rt6_lock);
|
|
|
|
nrt = rt6_cow(rt, &fl->fl6_dst, &fl->fl6_src, NULL);
|
|
|
|
dst_release(&rt->u.dst);
|
|
rt = nrt;
|
|
|
|
if (rt->u.dst.error != -EEXIST || --attempts <= 0)
|
|
goto out2;
|
|
|
|
/* Race condition! In the gap, when rt6_lock was
|
|
released someone could insert this route. Relookup.
|
|
*/
|
|
dst_release(&rt->u.dst);
|
|
goto relookup;
|
|
}
|
|
dst_hold(&rt->u.dst);
|
|
|
|
out:
|
|
read_unlock_bh(&rt6_lock);
|
|
out2:
|
|
rt->u.dst.lastuse = jiffies;
|
|
rt->u.dst.__use++;
|
|
return &rt->u.dst;
|
|
}
|
|
|
|
|
|
/*
|
|
* Destination cache support functions
|
|
*/
|
|
|
|
static struct dst_entry *ip6_dst_check(struct dst_entry *dst, u32 cookie)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
rt = (struct rt6_info *) dst;
|
|
|
|
if (rt && rt->rt6i_node && (rt->rt6i_node->fn_sernum == cookie))
|
|
return dst;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
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)
|
|
ip6_del_rt(rt, NULL, NULL, NULL);
|
|
else
|
|
dst_release(dst);
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static void ip6_link_failure(struct sk_buff *skb)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_ADDR_UNREACH, 0, skb->dev);
|
|
|
|
rt = (struct rt6_info *) skb->dst;
|
|
if (rt) {
|
|
if (rt->rt6i_flags&RTF_CACHE) {
|
|
dst_set_expires(&rt->u.dst, 0);
|
|
rt->rt6i_flags |= RTF_EXPIRES;
|
|
} else if (rt->rt6i_node && (rt->rt6i_flags & RTF_DEFAULT))
|
|
rt->rt6i_node->fn_sernum = -1;
|
|
}
|
|
}
|
|
|
|
static void ip6_rt_update_pmtu(struct dst_entry *dst, u32 mtu)
|
|
{
|
|
struct rt6_info *rt6 = (struct rt6_info*)dst;
|
|
|
|
if (mtu < dst_mtu(dst) && rt6->rt6i_dst.plen == 128) {
|
|
rt6->rt6i_flags |= RTF_MODIFIED;
|
|
if (mtu < IPV6_MIN_MTU) {
|
|
mtu = IPV6_MIN_MTU;
|
|
dst->metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
|
|
}
|
|
dst->metrics[RTAX_MTU-1] = mtu;
|
|
}
|
|
}
|
|
|
|
/* Protected by rt6_lock. */
|
|
static struct dst_entry *ndisc_dst_gc_list;
|
|
static int ipv6_get_mtu(struct net_device *dev);
|
|
|
|
static inline unsigned int ipv6_advmss(unsigned int mtu)
|
|
{
|
|
mtu -= sizeof(struct ipv6hdr) + sizeof(struct tcphdr);
|
|
|
|
if (mtu < ip6_rt_min_advmss)
|
|
mtu = 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;
|
|
}
|
|
|
|
struct dst_entry *ndisc_dst_alloc(struct net_device *dev,
|
|
struct neighbour *neigh,
|
|
struct in6_addr *addr,
|
|
int (*output)(struct sk_buff *))
|
|
{
|
|
struct rt6_info *rt;
|
|
struct inet6_dev *idev = in6_dev_get(dev);
|
|
|
|
if (unlikely(idev == NULL))
|
|
return NULL;
|
|
|
|
rt = ip6_dst_alloc();
|
|
if (unlikely(rt == NULL)) {
|
|
in6_dev_put(idev);
|
|
goto out;
|
|
}
|
|
|
|
dev_hold(dev);
|
|
if (neigh)
|
|
neigh_hold(neigh);
|
|
else
|
|
neigh = ndisc_get_neigh(dev, addr);
|
|
|
|
rt->rt6i_dev = dev;
|
|
rt->rt6i_idev = idev;
|
|
rt->rt6i_nexthop = neigh;
|
|
atomic_set(&rt->u.dst.__refcnt, 1);
|
|
rt->u.dst.metrics[RTAX_HOPLIMIT-1] = 255;
|
|
rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
|
|
rt->u.dst.output = output;
|
|
|
|
#if 0 /* there's no chance to use these for ndisc */
|
|
rt->u.dst.flags = ipv6_addr_type(addr) & IPV6_ADDR_UNICAST
|
|
? DST_HOST
|
|
: 0;
|
|
ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
|
|
rt->rt6i_dst.plen = 128;
|
|
#endif
|
|
|
|
write_lock_bh(&rt6_lock);
|
|
rt->u.dst.next = ndisc_dst_gc_list;
|
|
ndisc_dst_gc_list = &rt->u.dst;
|
|
write_unlock_bh(&rt6_lock);
|
|
|
|
fib6_force_start_gc();
|
|
|
|
out:
|
|
return (struct dst_entry *)rt;
|
|
}
|
|
|
|
int ndisc_dst_gc(int *more)
|
|
{
|
|
struct dst_entry *dst, *next, **pprev;
|
|
int freed;
|
|
|
|
next = NULL;
|
|
pprev = &ndisc_dst_gc_list;
|
|
freed = 0;
|
|
while ((dst = *pprev) != NULL) {
|
|
if (!atomic_read(&dst->__refcnt)) {
|
|
*pprev = dst->next;
|
|
dst_free(dst);
|
|
freed++;
|
|
} else {
|
|
pprev = &dst->next;
|
|
(*more)++;
|
|
}
|
|
}
|
|
|
|
return freed;
|
|
}
|
|
|
|
static int ip6_dst_gc(void)
|
|
{
|
|
static unsigned expire = 30*HZ;
|
|
static unsigned long last_gc;
|
|
unsigned long now = jiffies;
|
|
|
|
if (time_after(last_gc + ip6_rt_gc_min_interval, now) &&
|
|
atomic_read(&ip6_dst_ops.entries) <= ip6_rt_max_size)
|
|
goto out;
|
|
|
|
expire++;
|
|
fib6_run_gc(expire);
|
|
last_gc = now;
|
|
if (atomic_read(&ip6_dst_ops.entries) < ip6_dst_ops.gc_thresh)
|
|
expire = ip6_rt_gc_timeout>>1;
|
|
|
|
out:
|
|
expire -= expire>>ip6_rt_gc_elasticity;
|
|
return (atomic_read(&ip6_dst_ops.entries) > ip6_rt_max_size);
|
|
}
|
|
|
|
/* Clean host part of a prefix. Not necessary in radix tree,
|
|
but results in cleaner routing tables.
|
|
|
|
Remove it only when all the things will work!
|
|
*/
|
|
|
|
static int ipv6_get_mtu(struct net_device *dev)
|
|
{
|
|
int mtu = IPV6_MIN_MTU;
|
|
struct inet6_dev *idev;
|
|
|
|
idev = in6_dev_get(dev);
|
|
if (idev) {
|
|
mtu = idev->cnf.mtu6;
|
|
in6_dev_put(idev);
|
|
}
|
|
return mtu;
|
|
}
|
|
|
|
int ipv6_get_hoplimit(struct net_device *dev)
|
|
{
|
|
int hoplimit = ipv6_devconf.hop_limit;
|
|
struct inet6_dev *idev;
|
|
|
|
idev = in6_dev_get(dev);
|
|
if (idev) {
|
|
hoplimit = idev->cnf.hop_limit;
|
|
in6_dev_put(idev);
|
|
}
|
|
return hoplimit;
|
|
}
|
|
|
|
/*
|
|
*
|
|
*/
|
|
|
|
int ip6_route_add(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh,
|
|
void *_rtattr, struct netlink_skb_parms *req)
|
|
{
|
|
int err;
|
|
struct rtmsg *r;
|
|
struct rtattr **rta;
|
|
struct rt6_info *rt = NULL;
|
|
struct net_device *dev = NULL;
|
|
struct inet6_dev *idev = NULL;
|
|
int addr_type;
|
|
|
|
rta = (struct rtattr **) _rtattr;
|
|
|
|
if (rtmsg->rtmsg_dst_len > 128 || rtmsg->rtmsg_src_len > 128)
|
|
return -EINVAL;
|
|
#ifndef CONFIG_IPV6_SUBTREES
|
|
if (rtmsg->rtmsg_src_len)
|
|
return -EINVAL;
|
|
#endif
|
|
if (rtmsg->rtmsg_ifindex) {
|
|
err = -ENODEV;
|
|
dev = dev_get_by_index(rtmsg->rtmsg_ifindex);
|
|
if (!dev)
|
|
goto out;
|
|
idev = in6_dev_get(dev);
|
|
if (!idev)
|
|
goto out;
|
|
}
|
|
|
|
if (rtmsg->rtmsg_metric == 0)
|
|
rtmsg->rtmsg_metric = IP6_RT_PRIO_USER;
|
|
|
|
rt = ip6_dst_alloc();
|
|
|
|
if (rt == NULL) {
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
rt->u.dst.obsolete = -1;
|
|
rt->rt6i_expires = clock_t_to_jiffies(rtmsg->rtmsg_info);
|
|
if (nlh && (r = NLMSG_DATA(nlh))) {
|
|
rt->rt6i_protocol = r->rtm_protocol;
|
|
} else {
|
|
rt->rt6i_protocol = RTPROT_BOOT;
|
|
}
|
|
|
|
addr_type = ipv6_addr_type(&rtmsg->rtmsg_dst);
|
|
|
|
if (addr_type & IPV6_ADDR_MULTICAST)
|
|
rt->u.dst.input = ip6_mc_input;
|
|
else
|
|
rt->u.dst.input = ip6_forward;
|
|
|
|
rt->u.dst.output = ip6_output;
|
|
|
|
ipv6_addr_prefix(&rt->rt6i_dst.addr,
|
|
&rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len);
|
|
rt->rt6i_dst.plen = rtmsg->rtmsg_dst_len;
|
|
if (rt->rt6i_dst.plen == 128)
|
|
rt->u.dst.flags = DST_HOST;
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
ipv6_addr_prefix(&rt->rt6i_src.addr,
|
|
&rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
|
|
rt->rt6i_src.plen = rtmsg->rtmsg_src_len;
|
|
#endif
|
|
|
|
rt->rt6i_metric = rtmsg->rtmsg_metric;
|
|
|
|
/* We cannot add true routes via loopback here,
|
|
they would result in kernel looping; promote them to reject routes
|
|
*/
|
|
if ((rtmsg->rtmsg_flags&RTF_REJECT) ||
|
|
(dev && (dev->flags&IFF_LOOPBACK) && !(addr_type&IPV6_ADDR_LOOPBACK))) {
|
|
/* hold loopback dev/idev if we haven't done so. */
|
|
if (dev != &loopback_dev) {
|
|
if (dev) {
|
|
dev_put(dev);
|
|
in6_dev_put(idev);
|
|
}
|
|
dev = &loopback_dev;
|
|
dev_hold(dev);
|
|
idev = in6_dev_get(dev);
|
|
if (!idev) {
|
|
err = -ENODEV;
|
|
goto out;
|
|
}
|
|
}
|
|
rt->u.dst.output = ip6_pkt_discard_out;
|
|
rt->u.dst.input = ip6_pkt_discard;
|
|
rt->u.dst.error = -ENETUNREACH;
|
|
rt->rt6i_flags = RTF_REJECT|RTF_NONEXTHOP;
|
|
goto install_route;
|
|
}
|
|
|
|
if (rtmsg->rtmsg_flags & RTF_GATEWAY) {
|
|
struct in6_addr *gw_addr;
|
|
int gwa_type;
|
|
|
|
gw_addr = &rtmsg->rtmsg_gateway;
|
|
ipv6_addr_copy(&rt->rt6i_gateway, &rtmsg->rtmsg_gateway);
|
|
gwa_type = ipv6_addr_type(gw_addr);
|
|
|
|
if (gwa_type != (IPV6_ADDR_LINKLOCAL|IPV6_ADDR_UNICAST)) {
|
|
struct rt6_info *grt;
|
|
|
|
/* 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
|
|
*/
|
|
err = -EINVAL;
|
|
if (!(gwa_type&IPV6_ADDR_UNICAST))
|
|
goto out;
|
|
|
|
grt = rt6_lookup(gw_addr, NULL, rtmsg->rtmsg_ifindex, 1);
|
|
|
|
err = -EHOSTUNREACH;
|
|
if (grt == NULL)
|
|
goto out;
|
|
if (dev) {
|
|
if (dev != grt->rt6i_dev) {
|
|
dst_release(&grt->u.dst);
|
|
goto out;
|
|
}
|
|
} else {
|
|
dev = grt->rt6i_dev;
|
|
idev = grt->rt6i_idev;
|
|
dev_hold(dev);
|
|
in6_dev_hold(grt->rt6i_idev);
|
|
}
|
|
if (!(grt->rt6i_flags&RTF_GATEWAY))
|
|
err = 0;
|
|
dst_release(&grt->u.dst);
|
|
|
|
if (err)
|
|
goto out;
|
|
}
|
|
err = -EINVAL;
|
|
if (dev == NULL || (dev->flags&IFF_LOOPBACK))
|
|
goto out;
|
|
}
|
|
|
|
err = -ENODEV;
|
|
if (dev == NULL)
|
|
goto out;
|
|
|
|
if (rtmsg->rtmsg_flags & (RTF_GATEWAY|RTF_NONEXTHOP)) {
|
|
rt->rt6i_nexthop = __neigh_lookup_errno(&nd_tbl, &rt->rt6i_gateway, dev);
|
|
if (IS_ERR(rt->rt6i_nexthop)) {
|
|
err = PTR_ERR(rt->rt6i_nexthop);
|
|
rt->rt6i_nexthop = NULL;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
rt->rt6i_flags = rtmsg->rtmsg_flags;
|
|
|
|
install_route:
|
|
if (rta && rta[RTA_METRICS-1]) {
|
|
int attrlen = RTA_PAYLOAD(rta[RTA_METRICS-1]);
|
|
struct rtattr *attr = RTA_DATA(rta[RTA_METRICS-1]);
|
|
|
|
while (RTA_OK(attr, attrlen)) {
|
|
unsigned flavor = attr->rta_type;
|
|
if (flavor) {
|
|
if (flavor > RTAX_MAX) {
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
rt->u.dst.metrics[flavor-1] =
|
|
*(u32 *)RTA_DATA(attr);
|
|
}
|
|
attr = RTA_NEXT(attr, attrlen);
|
|
}
|
|
}
|
|
|
|
if (rt->u.dst.metrics[RTAX_HOPLIMIT-1] == 0)
|
|
rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
|
|
if (!rt->u.dst.metrics[RTAX_MTU-1])
|
|
rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(dev);
|
|
if (!rt->u.dst.metrics[RTAX_ADVMSS-1])
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
|
|
rt->u.dst.dev = dev;
|
|
rt->rt6i_idev = idev;
|
|
return ip6_ins_rt(rt, nlh, _rtattr, req);
|
|
|
|
out:
|
|
if (dev)
|
|
dev_put(dev);
|
|
if (idev)
|
|
in6_dev_put(idev);
|
|
if (rt)
|
|
dst_free((struct dst_entry *) rt);
|
|
return err;
|
|
}
|
|
|
|
int ip6_del_rt(struct rt6_info *rt, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req)
|
|
{
|
|
int err;
|
|
|
|
write_lock_bh(&rt6_lock);
|
|
|
|
rt6_reset_dflt_pointer(NULL);
|
|
|
|
err = fib6_del(rt, nlh, _rtattr, req);
|
|
dst_release(&rt->u.dst);
|
|
|
|
write_unlock_bh(&rt6_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ip6_route_del(struct in6_rtmsg *rtmsg, struct nlmsghdr *nlh, void *_rtattr, struct netlink_skb_parms *req)
|
|
{
|
|
struct fib6_node *fn;
|
|
struct rt6_info *rt;
|
|
int err = -ESRCH;
|
|
|
|
read_lock_bh(&rt6_lock);
|
|
|
|
fn = fib6_locate(&ip6_routing_table,
|
|
&rtmsg->rtmsg_dst, rtmsg->rtmsg_dst_len,
|
|
&rtmsg->rtmsg_src, rtmsg->rtmsg_src_len);
|
|
|
|
if (fn) {
|
|
for (rt = fn->leaf; rt; rt = rt->u.next) {
|
|
if (rtmsg->rtmsg_ifindex &&
|
|
(rt->rt6i_dev == NULL ||
|
|
rt->rt6i_dev->ifindex != rtmsg->rtmsg_ifindex))
|
|
continue;
|
|
if (rtmsg->rtmsg_flags&RTF_GATEWAY &&
|
|
!ipv6_addr_equal(&rtmsg->rtmsg_gateway, &rt->rt6i_gateway))
|
|
continue;
|
|
if (rtmsg->rtmsg_metric &&
|
|
rtmsg->rtmsg_metric != rt->rt6i_metric)
|
|
continue;
|
|
dst_hold(&rt->u.dst);
|
|
read_unlock_bh(&rt6_lock);
|
|
|
|
return ip6_del_rt(rt, nlh, _rtattr, req);
|
|
}
|
|
}
|
|
read_unlock_bh(&rt6_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Handle redirects
|
|
*/
|
|
void rt6_redirect(struct in6_addr *dest, struct in6_addr *saddr,
|
|
struct neighbour *neigh, u8 *lladdr, int on_link)
|
|
{
|
|
struct rt6_info *rt, *nrt;
|
|
|
|
/* Locate old route to this destination. */
|
|
rt = rt6_lookup(dest, NULL, neigh->dev->ifindex, 1);
|
|
|
|
if (rt == NULL)
|
|
return;
|
|
|
|
if (neigh->dev != rt->rt6i_dev)
|
|
goto out;
|
|
|
|
/*
|
|
* Current route is on-link; redirect is always invalid.
|
|
*
|
|
* Seems, previous statement is not true. It could
|
|
* be node, which looks for us as on-link (f.e. proxy ndisc)
|
|
* But then router serving it might decide, that we should
|
|
* know truth 8)8) --ANK (980726).
|
|
*/
|
|
if (!(rt->rt6i_flags&RTF_GATEWAY))
|
|
goto out;
|
|
|
|
/*
|
|
* RFC 2461 specifies that redirects should only be
|
|
* accepted if they come from the nexthop to the target.
|
|
* Due to the way default routers are chosen, this notion
|
|
* is a bit fuzzy and one might need to check all default
|
|
* routers.
|
|
*/
|
|
if (!ipv6_addr_equal(saddr, &rt->rt6i_gateway)) {
|
|
if (rt->rt6i_flags & RTF_DEFAULT) {
|
|
struct rt6_info *rt1;
|
|
|
|
read_lock(&rt6_lock);
|
|
for (rt1 = ip6_routing_table.leaf; rt1; rt1 = rt1->u.next) {
|
|
if (ipv6_addr_equal(saddr, &rt1->rt6i_gateway)) {
|
|
dst_hold(&rt1->u.dst);
|
|
dst_release(&rt->u.dst);
|
|
read_unlock(&rt6_lock);
|
|
rt = rt1;
|
|
goto source_ok;
|
|
}
|
|
}
|
|
read_unlock(&rt6_lock);
|
|
}
|
|
if (net_ratelimit())
|
|
printk(KERN_DEBUG "rt6_redirect: source isn't a valid nexthop "
|
|
"for redirect target\n");
|
|
goto out;
|
|
}
|
|
|
|
source_ok:
|
|
|
|
/*
|
|
* We have finally decided to accept it.
|
|
*/
|
|
|
|
neigh_update(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))
|
|
);
|
|
|
|
/*
|
|
* 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->u.dst);
|
|
|
|
/* Duplicate redirect: silently ignore. */
|
|
if (neigh == rt->u.dst.neighbour)
|
|
goto out;
|
|
|
|
nrt = ip6_rt_copy(rt);
|
|
if (nrt == NULL)
|
|
goto out;
|
|
|
|
nrt->rt6i_flags = RTF_GATEWAY|RTF_UP|RTF_DYNAMIC|RTF_CACHE;
|
|
if (on_link)
|
|
nrt->rt6i_flags &= ~RTF_GATEWAY;
|
|
|
|
ipv6_addr_copy(&nrt->rt6i_dst.addr, dest);
|
|
nrt->rt6i_dst.plen = 128;
|
|
nrt->u.dst.flags |= DST_HOST;
|
|
|
|
ipv6_addr_copy(&nrt->rt6i_gateway, (struct in6_addr*)neigh->primary_key);
|
|
nrt->rt6i_nexthop = neigh_clone(neigh);
|
|
/* Reset pmtu, it may be better */
|
|
nrt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(neigh->dev);
|
|
nrt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&nrt->u.dst));
|
|
|
|
if (ip6_ins_rt(nrt, NULL, NULL, NULL))
|
|
goto out;
|
|
|
|
if (rt->rt6i_flags&RTF_CACHE) {
|
|
ip6_del_rt(rt, NULL, NULL, NULL);
|
|
return;
|
|
}
|
|
|
|
out:
|
|
dst_release(&rt->u.dst);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Handle ICMP "packet too big" messages
|
|
* i.e. Path MTU discovery
|
|
*/
|
|
|
|
void rt6_pmtu_discovery(struct in6_addr *daddr, struct in6_addr *saddr,
|
|
struct net_device *dev, u32 pmtu)
|
|
{
|
|
struct rt6_info *rt, *nrt;
|
|
int allfrag = 0;
|
|
|
|
rt = rt6_lookup(daddr, saddr, dev->ifindex, 0);
|
|
if (rt == NULL)
|
|
return;
|
|
|
|
if (pmtu >= dst_mtu(&rt->u.dst))
|
|
goto out;
|
|
|
|
if (pmtu < IPV6_MIN_MTU) {
|
|
/*
|
|
* According to RFC2460, PMTU is set to the IPv6 Minimum Link
|
|
* MTU (1280) and a fragment header should always be included
|
|
* after a node receiving Too Big message reporting PMTU is
|
|
* less than the IPv6 Minimum Link MTU.
|
|
*/
|
|
pmtu = IPV6_MIN_MTU;
|
|
allfrag = 1;
|
|
}
|
|
|
|
/* New mtu received -> path was valid.
|
|
They are sent only in response to data packets,
|
|
so that this nexthop apparently is reachable. --ANK
|
|
*/
|
|
dst_confirm(&rt->u.dst);
|
|
|
|
/* Host route. If it is static, it would be better
|
|
not to override it, but add new one, so that
|
|
when cache entry will expire old pmtu
|
|
would return automatically.
|
|
*/
|
|
if (rt->rt6i_flags & RTF_CACHE) {
|
|
rt->u.dst.metrics[RTAX_MTU-1] = pmtu;
|
|
if (allfrag)
|
|
rt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
|
|
dst_set_expires(&rt->u.dst, ip6_rt_mtu_expires);
|
|
rt->rt6i_flags |= RTF_MODIFIED|RTF_EXPIRES;
|
|
goto out;
|
|
}
|
|
|
|
/* Network route.
|
|
Two cases are possible:
|
|
1. It is connected route. Action: COW
|
|
2. It is gatewayed route or NONEXTHOP route. Action: clone it.
|
|
*/
|
|
if (!rt->rt6i_nexthop && !(rt->rt6i_flags & RTF_NONEXTHOP)) {
|
|
nrt = rt6_cow(rt, daddr, saddr, NULL);
|
|
if (!nrt->u.dst.error) {
|
|
nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
|
|
if (allfrag)
|
|
nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
|
|
/* According to RFC 1981, detecting PMTU increase shouldn't be
|
|
happened within 5 mins, the recommended timer is 10 mins.
|
|
Here this route expiration time is set to ip6_rt_mtu_expires
|
|
which is 10 mins. After 10 mins the decreased pmtu is expired
|
|
and detecting PMTU increase will be automatically happened.
|
|
*/
|
|
dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
|
|
nrt->rt6i_flags |= RTF_DYNAMIC|RTF_EXPIRES;
|
|
}
|
|
dst_release(&nrt->u.dst);
|
|
} else {
|
|
nrt = ip6_rt_copy(rt);
|
|
if (nrt == NULL)
|
|
goto out;
|
|
ipv6_addr_copy(&nrt->rt6i_dst.addr, daddr);
|
|
nrt->rt6i_dst.plen = 128;
|
|
nrt->u.dst.flags |= DST_HOST;
|
|
nrt->rt6i_nexthop = neigh_clone(rt->rt6i_nexthop);
|
|
dst_set_expires(&nrt->u.dst, ip6_rt_mtu_expires);
|
|
nrt->rt6i_flags |= RTF_DYNAMIC|RTF_CACHE|RTF_EXPIRES;
|
|
nrt->u.dst.metrics[RTAX_MTU-1] = pmtu;
|
|
if (allfrag)
|
|
nrt->u.dst.metrics[RTAX_FEATURES-1] |= RTAX_FEATURE_ALLFRAG;
|
|
ip6_ins_rt(nrt, NULL, NULL, NULL);
|
|
}
|
|
|
|
out:
|
|
dst_release(&rt->u.dst);
|
|
}
|
|
|
|
/*
|
|
* Misc support functions
|
|
*/
|
|
|
|
static struct rt6_info * ip6_rt_copy(struct rt6_info *ort)
|
|
{
|
|
struct rt6_info *rt = ip6_dst_alloc();
|
|
|
|
if (rt) {
|
|
rt->u.dst.input = ort->u.dst.input;
|
|
rt->u.dst.output = ort->u.dst.output;
|
|
|
|
memcpy(rt->u.dst.metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
|
|
rt->u.dst.dev = ort->u.dst.dev;
|
|
if (rt->u.dst.dev)
|
|
dev_hold(rt->u.dst.dev);
|
|
rt->rt6i_idev = ort->rt6i_idev;
|
|
if (rt->rt6i_idev)
|
|
in6_dev_hold(rt->rt6i_idev);
|
|
rt->u.dst.lastuse = jiffies;
|
|
rt->rt6i_expires = 0;
|
|
|
|
ipv6_addr_copy(&rt->rt6i_gateway, &ort->rt6i_gateway);
|
|
rt->rt6i_flags = ort->rt6i_flags & ~RTF_EXPIRES;
|
|
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
|
|
}
|
|
return rt;
|
|
}
|
|
|
|
struct rt6_info *rt6_get_dflt_router(struct in6_addr *addr, struct net_device *dev)
|
|
{
|
|
struct rt6_info *rt;
|
|
struct fib6_node *fn;
|
|
|
|
fn = &ip6_routing_table;
|
|
|
|
write_lock_bh(&rt6_lock);
|
|
for (rt = fn->leaf; rt; rt=rt->u.next) {
|
|
if (dev == rt->rt6i_dev &&
|
|
ipv6_addr_equal(&rt->rt6i_gateway, addr))
|
|
break;
|
|
}
|
|
if (rt)
|
|
dst_hold(&rt->u.dst);
|
|
write_unlock_bh(&rt6_lock);
|
|
return rt;
|
|
}
|
|
|
|
struct rt6_info *rt6_add_dflt_router(struct in6_addr *gwaddr,
|
|
struct net_device *dev)
|
|
{
|
|
struct in6_rtmsg rtmsg;
|
|
|
|
memset(&rtmsg, 0, sizeof(struct in6_rtmsg));
|
|
rtmsg.rtmsg_type = RTMSG_NEWROUTE;
|
|
ipv6_addr_copy(&rtmsg.rtmsg_gateway, gwaddr);
|
|
rtmsg.rtmsg_metric = 1024;
|
|
rtmsg.rtmsg_flags = RTF_GATEWAY | RTF_ADDRCONF | RTF_DEFAULT | RTF_UP | RTF_EXPIRES;
|
|
|
|
rtmsg.rtmsg_ifindex = dev->ifindex;
|
|
|
|
ip6_route_add(&rtmsg, NULL, NULL, NULL);
|
|
return rt6_get_dflt_router(gwaddr, dev);
|
|
}
|
|
|
|
void rt6_purge_dflt_routers(void)
|
|
{
|
|
struct rt6_info *rt;
|
|
|
|
restart:
|
|
read_lock_bh(&rt6_lock);
|
|
for (rt = ip6_routing_table.leaf; rt; rt = rt->u.next) {
|
|
if (rt->rt6i_flags & (RTF_DEFAULT | RTF_ADDRCONF)) {
|
|
dst_hold(&rt->u.dst);
|
|
|
|
rt6_reset_dflt_pointer(NULL);
|
|
|
|
read_unlock_bh(&rt6_lock);
|
|
|
|
ip6_del_rt(rt, NULL, NULL, NULL);
|
|
|
|
goto restart;
|
|
}
|
|
}
|
|
read_unlock_bh(&rt6_lock);
|
|
}
|
|
|
|
int ipv6_route_ioctl(unsigned int cmd, void __user *arg)
|
|
{
|
|
struct in6_rtmsg rtmsg;
|
|
int err;
|
|
|
|
switch(cmd) {
|
|
case SIOCADDRT: /* Add a route */
|
|
case SIOCDELRT: /* Delete a route */
|
|
if (!capable(CAP_NET_ADMIN))
|
|
return -EPERM;
|
|
err = copy_from_user(&rtmsg, arg,
|
|
sizeof(struct in6_rtmsg));
|
|
if (err)
|
|
return -EFAULT;
|
|
|
|
rtnl_lock();
|
|
switch (cmd) {
|
|
case SIOCADDRT:
|
|
err = ip6_route_add(&rtmsg, NULL, NULL, NULL);
|
|
break;
|
|
case SIOCDELRT:
|
|
err = ip6_route_del(&rtmsg, NULL, NULL, NULL);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
rtnl_unlock();
|
|
|
|
return err;
|
|
};
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
/*
|
|
* Drop the packet on the floor
|
|
*/
|
|
|
|
static int ip6_pkt_discard(struct sk_buff *skb)
|
|
{
|
|
IP6_INC_STATS(IPSTATS_MIB_OUTNOROUTES);
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_NOROUTE, 0, skb->dev);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_pkt_discard_out(struct sk_buff *skb)
|
|
{
|
|
skb->dev = skb->dst->dev;
|
|
return ip6_pkt_discard(skb);
|
|
}
|
|
|
|
/*
|
|
* Allocate a dst for local (unicast / anycast) address.
|
|
*/
|
|
|
|
struct rt6_info *addrconf_dst_alloc(struct inet6_dev *idev,
|
|
const struct in6_addr *addr,
|
|
int anycast)
|
|
{
|
|
struct rt6_info *rt = ip6_dst_alloc();
|
|
|
|
if (rt == NULL)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
dev_hold(&loopback_dev);
|
|
in6_dev_hold(idev);
|
|
|
|
rt->u.dst.flags = DST_HOST;
|
|
rt->u.dst.input = ip6_input;
|
|
rt->u.dst.output = ip6_output;
|
|
rt->rt6i_dev = &loopback_dev;
|
|
rt->rt6i_idev = idev;
|
|
rt->u.dst.metrics[RTAX_MTU-1] = ipv6_get_mtu(rt->rt6i_dev);
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(dst_mtu(&rt->u.dst));
|
|
rt->u.dst.metrics[RTAX_HOPLIMIT-1] = -1;
|
|
rt->u.dst.obsolete = -1;
|
|
|
|
rt->rt6i_flags = RTF_UP | RTF_NONEXTHOP;
|
|
if (!anycast)
|
|
rt->rt6i_flags |= RTF_LOCAL;
|
|
rt->rt6i_nexthop = ndisc_get_neigh(rt->rt6i_dev, &rt->rt6i_gateway);
|
|
if (rt->rt6i_nexthop == NULL) {
|
|
dst_free((struct dst_entry *) rt);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
ipv6_addr_copy(&rt->rt6i_dst.addr, addr);
|
|
rt->rt6i_dst.plen = 128;
|
|
|
|
atomic_set(&rt->u.dst.__refcnt, 1);
|
|
|
|
return rt;
|
|
}
|
|
|
|
static int fib6_ifdown(struct rt6_info *rt, void *arg)
|
|
{
|
|
if (((void*)rt->rt6i_dev == arg || arg == NULL) &&
|
|
rt != &ip6_null_entry) {
|
|
RT6_TRACE("deleted by ifdown %p\n", rt);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void rt6_ifdown(struct net_device *dev)
|
|
{
|
|
write_lock_bh(&rt6_lock);
|
|
fib6_clean_tree(&ip6_routing_table, fib6_ifdown, 0, dev);
|
|
write_unlock_bh(&rt6_lock);
|
|
}
|
|
|
|
struct rt6_mtu_change_arg
|
|
{
|
|
struct net_device *dev;
|
|
unsigned 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 == NULL)
|
|
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->rt6i_dev == arg->dev &&
|
|
!dst_metric_locked(&rt->u.dst, RTAX_MTU) &&
|
|
(dst_mtu(&rt->u.dst) > arg->mtu ||
|
|
(dst_mtu(&rt->u.dst) < arg->mtu &&
|
|
dst_mtu(&rt->u.dst) == idev->cnf.mtu6)))
|
|
rt->u.dst.metrics[RTAX_MTU-1] = arg->mtu;
|
|
rt->u.dst.metrics[RTAX_ADVMSS-1] = ipv6_advmss(arg->mtu);
|
|
return 0;
|
|
}
|
|
|
|
void rt6_mtu_change(struct net_device *dev, unsigned mtu)
|
|
{
|
|
struct rt6_mtu_change_arg arg;
|
|
|
|
arg.dev = dev;
|
|
arg.mtu = mtu;
|
|
read_lock_bh(&rt6_lock);
|
|
fib6_clean_tree(&ip6_routing_table, rt6_mtu_change_route, 0, &arg);
|
|
read_unlock_bh(&rt6_lock);
|
|
}
|
|
|
|
static int inet6_rtm_to_rtmsg(struct rtmsg *r, struct rtattr **rta,
|
|
struct in6_rtmsg *rtmsg)
|
|
{
|
|
memset(rtmsg, 0, sizeof(*rtmsg));
|
|
|
|
rtmsg->rtmsg_dst_len = r->rtm_dst_len;
|
|
rtmsg->rtmsg_src_len = r->rtm_src_len;
|
|
rtmsg->rtmsg_flags = RTF_UP;
|
|
if (r->rtm_type == RTN_UNREACHABLE)
|
|
rtmsg->rtmsg_flags |= RTF_REJECT;
|
|
|
|
if (rta[RTA_GATEWAY-1]) {
|
|
if (rta[RTA_GATEWAY-1]->rta_len != RTA_LENGTH(16))
|
|
return -EINVAL;
|
|
memcpy(&rtmsg->rtmsg_gateway, RTA_DATA(rta[RTA_GATEWAY-1]), 16);
|
|
rtmsg->rtmsg_flags |= RTF_GATEWAY;
|
|
}
|
|
if (rta[RTA_DST-1]) {
|
|
if (RTA_PAYLOAD(rta[RTA_DST-1]) < ((r->rtm_dst_len+7)>>3))
|
|
return -EINVAL;
|
|
memcpy(&rtmsg->rtmsg_dst, RTA_DATA(rta[RTA_DST-1]), ((r->rtm_dst_len+7)>>3));
|
|
}
|
|
if (rta[RTA_SRC-1]) {
|
|
if (RTA_PAYLOAD(rta[RTA_SRC-1]) < ((r->rtm_src_len+7)>>3))
|
|
return -EINVAL;
|
|
memcpy(&rtmsg->rtmsg_src, RTA_DATA(rta[RTA_SRC-1]), ((r->rtm_src_len+7)>>3));
|
|
}
|
|
if (rta[RTA_OIF-1]) {
|
|
if (rta[RTA_OIF-1]->rta_len != RTA_LENGTH(sizeof(int)))
|
|
return -EINVAL;
|
|
memcpy(&rtmsg->rtmsg_ifindex, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
|
|
}
|
|
if (rta[RTA_PRIORITY-1]) {
|
|
if (rta[RTA_PRIORITY-1]->rta_len != RTA_LENGTH(4))
|
|
return -EINVAL;
|
|
memcpy(&rtmsg->rtmsg_metric, RTA_DATA(rta[RTA_PRIORITY-1]), 4);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int inet6_rtm_delroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct rtmsg *r = NLMSG_DATA(nlh);
|
|
struct in6_rtmsg rtmsg;
|
|
|
|
if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
|
|
return -EINVAL;
|
|
return ip6_route_del(&rtmsg, nlh, arg, &NETLINK_CB(skb));
|
|
}
|
|
|
|
int inet6_rtm_newroute(struct sk_buff *skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct rtmsg *r = NLMSG_DATA(nlh);
|
|
struct in6_rtmsg rtmsg;
|
|
|
|
if (inet6_rtm_to_rtmsg(r, arg, &rtmsg))
|
|
return -EINVAL;
|
|
return ip6_route_add(&rtmsg, nlh, arg, &NETLINK_CB(skb));
|
|
}
|
|
|
|
struct rt6_rtnl_dump_arg
|
|
{
|
|
struct sk_buff *skb;
|
|
struct netlink_callback *cb;
|
|
};
|
|
|
|
static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt,
|
|
struct in6_addr *dst, struct in6_addr *src,
|
|
int iif, int type, u32 pid, u32 seq,
|
|
int prefix, unsigned int flags)
|
|
{
|
|
struct rtmsg *rtm;
|
|
struct nlmsghdr *nlh;
|
|
unsigned char *b = skb->tail;
|
|
struct rta_cacheinfo ci;
|
|
|
|
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_NEW(skb, pid, seq, type, sizeof(*rtm), flags);
|
|
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;
|
|
rtm->rtm_table = RT_TABLE_MAIN;
|
|
if (rt->rt6i_flags&RTF_REJECT)
|
|
rtm->rtm_type = RTN_UNREACHABLE;
|
|
else if (rt->rt6i_dev && (rt->rt6i_dev->flags&IFF_LOOPBACK))
|
|
rtm->rtm_type = RTN_LOCAL;
|
|
else
|
|
rtm->rtm_type = RTN_UNICAST;
|
|
rtm->rtm_flags = 0;
|
|
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)
|
|
rtm->rtm_protocol = RTPROT_KERNEL;
|
|
else if (rt->rt6i_flags&RTF_DEFAULT)
|
|
rtm->rtm_protocol = RTPROT_RA;
|
|
|
|
if (rt->rt6i_flags&RTF_CACHE)
|
|
rtm->rtm_flags |= RTM_F_CLONED;
|
|
|
|
if (dst) {
|
|
RTA_PUT(skb, RTA_DST, 16, dst);
|
|
rtm->rtm_dst_len = 128;
|
|
} else if (rtm->rtm_dst_len)
|
|
RTA_PUT(skb, RTA_DST, 16, &rt->rt6i_dst.addr);
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
if (src) {
|
|
RTA_PUT(skb, RTA_SRC, 16, src);
|
|
rtm->rtm_src_len = 128;
|
|
} else if (rtm->rtm_src_len)
|
|
RTA_PUT(skb, RTA_SRC, 16, &rt->rt6i_src.addr);
|
|
#endif
|
|
if (iif)
|
|
RTA_PUT(skb, RTA_IIF, 4, &iif);
|
|
else if (dst) {
|
|
struct in6_addr saddr_buf;
|
|
if (ipv6_get_saddr(&rt->u.dst, dst, &saddr_buf) == 0)
|
|
RTA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf);
|
|
}
|
|
if (rtnetlink_put_metrics(skb, rt->u.dst.metrics) < 0)
|
|
goto rtattr_failure;
|
|
if (rt->u.dst.neighbour)
|
|
RTA_PUT(skb, RTA_GATEWAY, 16, &rt->u.dst.neighbour->primary_key);
|
|
if (rt->u.dst.dev)
|
|
RTA_PUT(skb, RTA_OIF, sizeof(int), &rt->rt6i_dev->ifindex);
|
|
RTA_PUT(skb, RTA_PRIORITY, 4, &rt->rt6i_metric);
|
|
ci.rta_lastuse = jiffies_to_clock_t(jiffies - rt->u.dst.lastuse);
|
|
if (rt->rt6i_expires)
|
|
ci.rta_expires = jiffies_to_clock_t(rt->rt6i_expires - jiffies);
|
|
else
|
|
ci.rta_expires = 0;
|
|
ci.rta_used = rt->u.dst.__use;
|
|
ci.rta_clntref = atomic_read(&rt->u.dst.__refcnt);
|
|
ci.rta_error = rt->u.dst.error;
|
|
ci.rta_id = 0;
|
|
ci.rta_ts = 0;
|
|
ci.rta_tsage = 0;
|
|
RTA_PUT(skb, RTA_CACHEINFO, sizeof(ci), &ci);
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
rtattr_failure:
|
|
skb_trim(skb, b - skb->data);
|
|
return -1;
|
|
}
|
|
|
|
static 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 (arg->cb->nlh->nlmsg_len >= NLMSG_LENGTH(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->skb, rt, NULL, NULL, 0, RTM_NEWROUTE,
|
|
NETLINK_CB(arg->cb->skb).pid, arg->cb->nlh->nlmsg_seq,
|
|
prefix, NLM_F_MULTI);
|
|
}
|
|
|
|
static int fib6_dump_node(struct fib6_walker_t *w)
|
|
{
|
|
int res;
|
|
struct rt6_info *rt;
|
|
|
|
for (rt = w->leaf; rt; rt = rt->u.next) {
|
|
res = rt6_dump_route(rt, w->args);
|
|
if (res < 0) {
|
|
/* Frame is full, suspend walking */
|
|
w->leaf = rt;
|
|
return 1;
|
|
}
|
|
BUG_TRAP(res!=0);
|
|
}
|
|
w->leaf = NULL;
|
|
return 0;
|
|
}
|
|
|
|
static void fib6_dump_end(struct netlink_callback *cb)
|
|
{
|
|
struct fib6_walker_t *w = (void*)cb->args[0];
|
|
|
|
if (w) {
|
|
cb->args[0] = 0;
|
|
fib6_walker_unlink(w);
|
|
kfree(w);
|
|
}
|
|
if (cb->args[1]) {
|
|
cb->done = (void*)cb->args[1];
|
|
cb->args[1] = 0;
|
|
}
|
|
}
|
|
|
|
static int fib6_dump_done(struct netlink_callback *cb)
|
|
{
|
|
fib6_dump_end(cb);
|
|
return cb->done(cb);
|
|
}
|
|
|
|
int inet6_dump_fib(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct rt6_rtnl_dump_arg arg;
|
|
struct fib6_walker_t *w;
|
|
int res;
|
|
|
|
arg.skb = skb;
|
|
arg.cb = cb;
|
|
|
|
w = (void*)cb->args[0];
|
|
if (w == NULL) {
|
|
/* New dump:
|
|
*
|
|
* 1. hook callback destructor.
|
|
*/
|
|
cb->args[1] = (long)cb->done;
|
|
cb->done = fib6_dump_done;
|
|
|
|
/*
|
|
* 2. allocate and initialize walker.
|
|
*/
|
|
w = kmalloc(sizeof(*w), GFP_ATOMIC);
|
|
if (w == NULL)
|
|
return -ENOMEM;
|
|
RT6_TRACE("dump<%p", w);
|
|
memset(w, 0, sizeof(*w));
|
|
w->root = &ip6_routing_table;
|
|
w->func = fib6_dump_node;
|
|
w->args = &arg;
|
|
cb->args[0] = (long)w;
|
|
read_lock_bh(&rt6_lock);
|
|
res = fib6_walk(w);
|
|
read_unlock_bh(&rt6_lock);
|
|
} else {
|
|
w->args = &arg;
|
|
read_lock_bh(&rt6_lock);
|
|
res = fib6_walk_continue(w);
|
|
read_unlock_bh(&rt6_lock);
|
|
}
|
|
#if RT6_DEBUG >= 3
|
|
if (res <= 0 && skb->len == 0)
|
|
RT6_TRACE("%p>dump end\n", w);
|
|
#endif
|
|
res = res < 0 ? res : skb->len;
|
|
/* res < 0 is an error. (really, impossible)
|
|
res == 0 means that dump is complete, but skb still can contain data.
|
|
res > 0 dump is not complete, but frame is full.
|
|
*/
|
|
/* Destroy walker, if dump of this table is complete. */
|
|
if (res <= 0)
|
|
fib6_dump_end(cb);
|
|
return res;
|
|
}
|
|
|
|
int inet6_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr* nlh, void *arg)
|
|
{
|
|
struct rtattr **rta = arg;
|
|
int iif = 0;
|
|
int err = -ENOBUFS;
|
|
struct sk_buff *skb;
|
|
struct flowi fl;
|
|
struct rt6_info *rt;
|
|
|
|
skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (skb == NULL)
|
|
goto out;
|
|
|
|
/* Reserve room for dummy headers, this skb can pass
|
|
through good chunk of routing engine.
|
|
*/
|
|
skb->mac.raw = skb->data;
|
|
skb_reserve(skb, MAX_HEADER + sizeof(struct ipv6hdr));
|
|
|
|
memset(&fl, 0, sizeof(fl));
|
|
if (rta[RTA_SRC-1])
|
|
ipv6_addr_copy(&fl.fl6_src,
|
|
(struct in6_addr*)RTA_DATA(rta[RTA_SRC-1]));
|
|
if (rta[RTA_DST-1])
|
|
ipv6_addr_copy(&fl.fl6_dst,
|
|
(struct in6_addr*)RTA_DATA(rta[RTA_DST-1]));
|
|
|
|
if (rta[RTA_IIF-1])
|
|
memcpy(&iif, RTA_DATA(rta[RTA_IIF-1]), sizeof(int));
|
|
|
|
if (iif) {
|
|
struct net_device *dev;
|
|
dev = __dev_get_by_index(iif);
|
|
if (!dev) {
|
|
err = -ENODEV;
|
|
goto out_free;
|
|
}
|
|
}
|
|
|
|
fl.oif = 0;
|
|
if (rta[RTA_OIF-1])
|
|
memcpy(&fl.oif, RTA_DATA(rta[RTA_OIF-1]), sizeof(int));
|
|
|
|
rt = (struct rt6_info*)ip6_route_output(NULL, &fl);
|
|
|
|
skb->dst = &rt->u.dst;
|
|
|
|
NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
|
|
err = rt6_fill_node(skb, rt,
|
|
&fl.fl6_dst, &fl.fl6_src,
|
|
iif,
|
|
RTM_NEWROUTE, NETLINK_CB(in_skb).pid,
|
|
nlh->nlmsg_seq, 0, 0);
|
|
if (err < 0) {
|
|
err = -EMSGSIZE;
|
|
goto out_free;
|
|
}
|
|
|
|
err = netlink_unicast(rtnl, skb, NETLINK_CB(in_skb).pid, MSG_DONTWAIT);
|
|
if (err > 0)
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
out_free:
|
|
kfree_skb(skb);
|
|
goto out;
|
|
}
|
|
|
|
void inet6_rt_notify(int event, struct rt6_info *rt, struct nlmsghdr *nlh,
|
|
struct netlink_skb_parms *req)
|
|
{
|
|
struct sk_buff *skb;
|
|
int size = NLMSG_SPACE(sizeof(struct rtmsg)+256);
|
|
u32 pid = current->pid;
|
|
u32 seq = 0;
|
|
|
|
if (req)
|
|
pid = req->pid;
|
|
if (nlh)
|
|
seq = nlh->nlmsg_seq;
|
|
|
|
skb = alloc_skb(size, gfp_any());
|
|
if (!skb) {
|
|
netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, ENOBUFS);
|
|
return;
|
|
}
|
|
if (rt6_fill_node(skb, rt, NULL, NULL, 0, event, pid, seq, 0, 0) < 0) {
|
|
kfree_skb(skb);
|
|
netlink_set_err(rtnl, 0, RTNLGRP_IPV6_ROUTE, EINVAL);
|
|
return;
|
|
}
|
|
NETLINK_CB(skb).dst_group = RTNLGRP_IPV6_ROUTE;
|
|
netlink_broadcast(rtnl, skb, 0, RTNLGRP_IPV6_ROUTE, gfp_any());
|
|
}
|
|
|
|
/*
|
|
* /proc
|
|
*/
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
#define RT6_INFO_LEN (32 + 4 + 32 + 4 + 32 + 40 + 5 + 1)
|
|
|
|
struct rt6_proc_arg
|
|
{
|
|
char *buffer;
|
|
int offset;
|
|
int length;
|
|
int skip;
|
|
int len;
|
|
};
|
|
|
|
static int rt6_info_route(struct rt6_info *rt, void *p_arg)
|
|
{
|
|
struct rt6_proc_arg *arg = (struct rt6_proc_arg *) p_arg;
|
|
int i;
|
|
|
|
if (arg->skip < arg->offset / RT6_INFO_LEN) {
|
|
arg->skip++;
|
|
return 0;
|
|
}
|
|
|
|
if (arg->len >= arg->length)
|
|
return 0;
|
|
|
|
for (i=0; i<16; i++) {
|
|
sprintf(arg->buffer + arg->len, "%02x",
|
|
rt->rt6i_dst.addr.s6_addr[i]);
|
|
arg->len += 2;
|
|
}
|
|
arg->len += sprintf(arg->buffer + arg->len, " %02x ",
|
|
rt->rt6i_dst.plen);
|
|
|
|
#ifdef CONFIG_IPV6_SUBTREES
|
|
for (i=0; i<16; i++) {
|
|
sprintf(arg->buffer + arg->len, "%02x",
|
|
rt->rt6i_src.addr.s6_addr[i]);
|
|
arg->len += 2;
|
|
}
|
|
arg->len += sprintf(arg->buffer + arg->len, " %02x ",
|
|
rt->rt6i_src.plen);
|
|
#else
|
|
sprintf(arg->buffer + arg->len,
|
|
"00000000000000000000000000000000 00 ");
|
|
arg->len += 36;
|
|
#endif
|
|
|
|
if (rt->rt6i_nexthop) {
|
|
for (i=0; i<16; i++) {
|
|
sprintf(arg->buffer + arg->len, "%02x",
|
|
rt->rt6i_nexthop->primary_key[i]);
|
|
arg->len += 2;
|
|
}
|
|
} else {
|
|
sprintf(arg->buffer + arg->len,
|
|
"00000000000000000000000000000000");
|
|
arg->len += 32;
|
|
}
|
|
arg->len += sprintf(arg->buffer + arg->len,
|
|
" %08x %08x %08x %08x %8s\n",
|
|
rt->rt6i_metric, atomic_read(&rt->u.dst.__refcnt),
|
|
rt->u.dst.__use, rt->rt6i_flags,
|
|
rt->rt6i_dev ? rt->rt6i_dev->name : "");
|
|
return 0;
|
|
}
|
|
|
|
static int rt6_proc_info(char *buffer, char **start, off_t offset, int length)
|
|
{
|
|
struct rt6_proc_arg arg;
|
|
arg.buffer = buffer;
|
|
arg.offset = offset;
|
|
arg.length = length;
|
|
arg.skip = 0;
|
|
arg.len = 0;
|
|
|
|
read_lock_bh(&rt6_lock);
|
|
fib6_clean_tree(&ip6_routing_table, rt6_info_route, 0, &arg);
|
|
read_unlock_bh(&rt6_lock);
|
|
|
|
*start = buffer;
|
|
if (offset)
|
|
*start += offset % RT6_INFO_LEN;
|
|
|
|
arg.len -= offset % RT6_INFO_LEN;
|
|
|
|
if (arg.len > length)
|
|
arg.len = length;
|
|
if (arg.len < 0)
|
|
arg.len = 0;
|
|
|
|
return arg.len;
|
|
}
|
|
|
|
static int rt6_stats_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
seq_printf(seq, "%04x %04x %04x %04x %04x %04x %04x\n",
|
|
rt6_stats.fib_nodes, rt6_stats.fib_route_nodes,
|
|
rt6_stats.fib_rt_alloc, rt6_stats.fib_rt_entries,
|
|
rt6_stats.fib_rt_cache,
|
|
atomic_read(&ip6_dst_ops.entries),
|
|
rt6_stats.fib_discarded_routes);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int rt6_stats_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, rt6_stats_seq_show, NULL);
|
|
}
|
|
|
|
static struct file_operations rt6_stats_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = rt6_stats_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
|
|
static int flush_delay;
|
|
|
|
static
|
|
int ipv6_sysctl_rtcache_flush(ctl_table *ctl, int write, struct file * filp,
|
|
void __user *buffer, size_t *lenp, loff_t *ppos)
|
|
{
|
|
if (write) {
|
|
proc_dointvec(ctl, write, filp, buffer, lenp, ppos);
|
|
fib6_run_gc(flush_delay <= 0 ? ~0UL : (unsigned long)flush_delay);
|
|
return 0;
|
|
} else
|
|
return -EINVAL;
|
|
}
|
|
|
|
ctl_table ipv6_route_table[] = {
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_FLUSH,
|
|
.procname = "flush",
|
|
.data = &flush_delay,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0200,
|
|
.proc_handler = &ipv6_sysctl_rtcache_flush
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_THRESH,
|
|
.procname = "gc_thresh",
|
|
.data = &ip6_dst_ops.gc_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_MAX_SIZE,
|
|
.procname = "max_size",
|
|
.data = &ip6_rt_max_size,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL,
|
|
.procname = "gc_min_interval",
|
|
.data = &ip6_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_TIMEOUT,
|
|
.procname = "gc_timeout",
|
|
.data = &ip6_rt_gc_timeout,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_INTERVAL,
|
|
.procname = "gc_interval",
|
|
.data = &ip6_rt_gc_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_ELASTICITY,
|
|
.procname = "gc_elasticity",
|
|
.data = &ip6_rt_gc_elasticity,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_MTU_EXPIRES,
|
|
.procname = "mtu_expires",
|
|
.data = &ip6_rt_mtu_expires,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_MIN_ADVMSS,
|
|
.procname = "min_adv_mss",
|
|
.data = &ip6_rt_min_advmss,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
.strategy = &sysctl_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV6_ROUTE_GC_MIN_INTERVAL_MS,
|
|
.procname = "gc_min_interval_ms",
|
|
.data = &ip6_rt_gc_min_interval,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_ms_jiffies,
|
|
.strategy = &sysctl_ms_jiffies,
|
|
},
|
|
{ .ctl_name = 0 }
|
|
};
|
|
|
|
#endif
|
|
|
|
void __init ip6_route_init(void)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
|
|
ip6_dst_ops.kmem_cachep = kmem_cache_create("ip6_dst_cache",
|
|
sizeof(struct rt6_info),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
NULL, NULL);
|
|
if (!ip6_dst_ops.kmem_cachep)
|
|
panic("cannot create ip6_dst_cache");
|
|
|
|
fib6_init();
|
|
#ifdef CONFIG_PROC_FS
|
|
p = proc_net_create("ipv6_route", 0, rt6_proc_info);
|
|
if (p)
|
|
p->owner = THIS_MODULE;
|
|
|
|
proc_net_fops_create("rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
|
|
#endif
|
|
#ifdef CONFIG_XFRM
|
|
xfrm6_init();
|
|
#endif
|
|
}
|
|
|
|
void ip6_route_cleanup(void)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_net_remove("ipv6_route");
|
|
proc_net_remove("rt6_stats");
|
|
#endif
|
|
#ifdef CONFIG_XFRM
|
|
xfrm6_fini();
|
|
#endif
|
|
rt6_ifdown(NULL);
|
|
fib6_gc_cleanup();
|
|
kmem_cache_destroy(ip6_dst_ops.kmem_cachep);
|
|
}
|