![Li RongQing](/assets/img/avatar_default.png)
Two places defined IPV6_TCLASS_SHIFT, so we should move it into ipv6.h, and use this macro as possible. And define ip6_tclass helper to return tclass Signed-off-by: Li RongQing <roy.qing.li@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1718 lines
40 KiB
C
1718 lines
40 KiB
C
/*
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* GRE over IPv6 protocol decoder.
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*
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* Authors: Dmitry Kozlov (xeb@mail.ru)
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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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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/capability.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/uaccess.h>
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#include <linux/skbuff.h>
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#include <linux/netdevice.h>
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#include <linux/in.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/if_arp.h>
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#include <linux/mroute.h>
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#include <linux/init.h>
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#include <linux/in6.h>
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#include <linux/inetdevice.h>
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#include <linux/igmp.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/etherdevice.h>
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#include <linux/if_ether.h>
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#include <linux/hash.h>
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#include <linux/if_tunnel.h>
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#include <linux/ip6_tunnel.h>
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#include <net/sock.h>
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#include <net/ip.h>
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#include <net/ip_tunnels.h>
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#include <net/icmp.h>
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#include <net/protocol.h>
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#include <net/addrconf.h>
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#include <net/arp.h>
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#include <net/checksum.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.h>
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#include <net/xfrm.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <net/rtnetlink.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/ip6_tunnel.h>
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static bool log_ecn_error = true;
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module_param(log_ecn_error, bool, 0644);
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MODULE_PARM_DESC(log_ecn_error, "Log packets received with corrupted ECN");
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#define HASH_SIZE_SHIFT 5
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#define HASH_SIZE (1 << HASH_SIZE_SHIFT)
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static int ip6gre_net_id __read_mostly;
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struct ip6gre_net {
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struct ip6_tnl __rcu *tunnels[4][HASH_SIZE];
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struct net_device *fb_tunnel_dev;
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};
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static struct rtnl_link_ops ip6gre_link_ops __read_mostly;
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static int ip6gre_tunnel_init(struct net_device *dev);
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static void ip6gre_tunnel_setup(struct net_device *dev);
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static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t);
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static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu);
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/* Tunnel hash table */
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/*
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4 hash tables:
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3: (remote,local)
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2: (remote,*)
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1: (*,local)
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0: (*,*)
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We require exact key match i.e. if a key is present in packet
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it will match only tunnel with the same key; if it is not present,
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it will match only keyless tunnel.
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All keysless packets, if not matched configured keyless tunnels
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will match fallback tunnel.
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*/
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#define HASH_KEY(key) (((__force u32)key^((__force u32)key>>4))&(HASH_SIZE - 1))
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static u32 HASH_ADDR(const struct in6_addr *addr)
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{
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u32 hash = ipv6_addr_hash(addr);
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return hash_32(hash, HASH_SIZE_SHIFT);
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}
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#define tunnels_r_l tunnels[3]
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#define tunnels_r tunnels[2]
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#define tunnels_l tunnels[1]
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#define tunnels_wc tunnels[0]
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/* Given src, dst and key, find appropriate for input tunnel. */
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static struct ip6_tnl *ip6gre_tunnel_lookup(struct net_device *dev,
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const struct in6_addr *remote, const struct in6_addr *local,
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__be32 key, __be16 gre_proto)
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{
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struct net *net = dev_net(dev);
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int link = dev->ifindex;
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unsigned int h0 = HASH_ADDR(remote);
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unsigned int h1 = HASH_KEY(key);
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struct ip6_tnl *t, *cand = NULL;
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struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
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int dev_type = (gre_proto == htons(ETH_P_TEB)) ?
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ARPHRD_ETHER : ARPHRD_IP6GRE;
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int score, cand_score = 4;
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for_each_ip_tunnel_rcu(t, ign->tunnels_r_l[h0 ^ h1]) {
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if (!ipv6_addr_equal(local, &t->parms.laddr) ||
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!ipv6_addr_equal(remote, &t->parms.raddr) ||
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key != t->parms.i_key ||
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!(t->dev->flags & IFF_UP))
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continue;
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if (t->dev->type != ARPHRD_IP6GRE &&
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t->dev->type != dev_type)
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continue;
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score = 0;
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if (t->parms.link != link)
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score |= 1;
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if (t->dev->type != dev_type)
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score |= 2;
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if (score == 0)
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return t;
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if (score < cand_score) {
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cand = t;
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cand_score = score;
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}
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}
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for_each_ip_tunnel_rcu(t, ign->tunnels_r[h0 ^ h1]) {
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if (!ipv6_addr_equal(remote, &t->parms.raddr) ||
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key != t->parms.i_key ||
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!(t->dev->flags & IFF_UP))
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continue;
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if (t->dev->type != ARPHRD_IP6GRE &&
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t->dev->type != dev_type)
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continue;
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score = 0;
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if (t->parms.link != link)
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score |= 1;
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if (t->dev->type != dev_type)
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score |= 2;
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if (score == 0)
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return t;
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if (score < cand_score) {
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cand = t;
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cand_score = score;
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}
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}
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for_each_ip_tunnel_rcu(t, ign->tunnels_l[h1]) {
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if ((!ipv6_addr_equal(local, &t->parms.laddr) &&
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(!ipv6_addr_equal(local, &t->parms.raddr) ||
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!ipv6_addr_is_multicast(local))) ||
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key != t->parms.i_key ||
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!(t->dev->flags & IFF_UP))
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continue;
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if (t->dev->type != ARPHRD_IP6GRE &&
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t->dev->type != dev_type)
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continue;
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score = 0;
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if (t->parms.link != link)
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score |= 1;
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if (t->dev->type != dev_type)
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score |= 2;
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if (score == 0)
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return t;
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if (score < cand_score) {
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cand = t;
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cand_score = score;
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}
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}
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for_each_ip_tunnel_rcu(t, ign->tunnels_wc[h1]) {
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if (t->parms.i_key != key ||
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!(t->dev->flags & IFF_UP))
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continue;
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if (t->dev->type != ARPHRD_IP6GRE &&
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t->dev->type != dev_type)
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continue;
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score = 0;
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if (t->parms.link != link)
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score |= 1;
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if (t->dev->type != dev_type)
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score |= 2;
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if (score == 0)
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return t;
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if (score < cand_score) {
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cand = t;
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cand_score = score;
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}
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}
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if (cand != NULL)
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return cand;
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dev = ign->fb_tunnel_dev;
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if (dev->flags & IFF_UP)
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return netdev_priv(dev);
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return NULL;
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}
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static struct ip6_tnl __rcu **__ip6gre_bucket(struct ip6gre_net *ign,
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const struct __ip6_tnl_parm *p)
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{
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const struct in6_addr *remote = &p->raddr;
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const struct in6_addr *local = &p->laddr;
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unsigned int h = HASH_KEY(p->i_key);
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int prio = 0;
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if (!ipv6_addr_any(local))
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prio |= 1;
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if (!ipv6_addr_any(remote) && !ipv6_addr_is_multicast(remote)) {
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prio |= 2;
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h ^= HASH_ADDR(remote);
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}
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return &ign->tunnels[prio][h];
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}
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static inline struct ip6_tnl __rcu **ip6gre_bucket(struct ip6gre_net *ign,
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const struct ip6_tnl *t)
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{
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return __ip6gre_bucket(ign, &t->parms);
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}
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static void ip6gre_tunnel_link(struct ip6gre_net *ign, struct ip6_tnl *t)
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{
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struct ip6_tnl __rcu **tp = ip6gre_bucket(ign, t);
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rcu_assign_pointer(t->next, rtnl_dereference(*tp));
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rcu_assign_pointer(*tp, t);
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}
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static void ip6gre_tunnel_unlink(struct ip6gre_net *ign, struct ip6_tnl *t)
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{
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struct ip6_tnl __rcu **tp;
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struct ip6_tnl *iter;
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for (tp = ip6gre_bucket(ign, t);
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(iter = rtnl_dereference(*tp)) != NULL;
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tp = &iter->next) {
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if (t == iter) {
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rcu_assign_pointer(*tp, t->next);
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break;
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}
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}
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}
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static struct ip6_tnl *ip6gre_tunnel_find(struct net *net,
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const struct __ip6_tnl_parm *parms,
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int type)
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{
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const struct in6_addr *remote = &parms->raddr;
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const struct in6_addr *local = &parms->laddr;
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__be32 key = parms->i_key;
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int link = parms->link;
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struct ip6_tnl *t;
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struct ip6_tnl __rcu **tp;
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struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
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for (tp = __ip6gre_bucket(ign, parms);
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(t = rtnl_dereference(*tp)) != NULL;
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tp = &t->next)
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if (ipv6_addr_equal(local, &t->parms.laddr) &&
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ipv6_addr_equal(remote, &t->parms.raddr) &&
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key == t->parms.i_key &&
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link == t->parms.link &&
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type == t->dev->type)
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break;
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return t;
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}
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static struct ip6_tnl *ip6gre_tunnel_locate(struct net *net,
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const struct __ip6_tnl_parm *parms, int create)
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{
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struct ip6_tnl *t, *nt;
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struct net_device *dev;
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char name[IFNAMSIZ];
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struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
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t = ip6gre_tunnel_find(net, parms, ARPHRD_IP6GRE);
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if (t || !create)
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return t;
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if (parms->name[0])
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strlcpy(name, parms->name, IFNAMSIZ);
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else
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strcpy(name, "ip6gre%d");
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dev = alloc_netdev(sizeof(*t), name, ip6gre_tunnel_setup);
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if (!dev)
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return NULL;
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dev_net_set(dev, net);
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nt = netdev_priv(dev);
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nt->parms = *parms;
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dev->rtnl_link_ops = &ip6gre_link_ops;
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nt->dev = dev;
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nt->net = dev_net(dev);
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ip6gre_tnl_link_config(nt, 1);
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if (register_netdevice(dev) < 0)
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goto failed_free;
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/* Can use a lockless transmit, unless we generate output sequences */
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if (!(nt->parms.o_flags & GRE_SEQ))
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dev->features |= NETIF_F_LLTX;
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dev_hold(dev);
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ip6gre_tunnel_link(ign, nt);
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return nt;
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failed_free:
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free_netdev(dev);
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return NULL;
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}
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static void ip6gre_tunnel_uninit(struct net_device *dev)
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{
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struct net *net = dev_net(dev);
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struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
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ip6gre_tunnel_unlink(ign, netdev_priv(dev));
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dev_put(dev);
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}
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static void ip6gre_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
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u8 type, u8 code, int offset, __be32 info)
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{
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const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
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__be16 *p = (__be16 *)(skb->data + offset);
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int grehlen = offset + 4;
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struct ip6_tnl *t;
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__be16 flags;
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flags = p[0];
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if (flags&(GRE_CSUM|GRE_KEY|GRE_SEQ|GRE_ROUTING|GRE_VERSION)) {
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if (flags&(GRE_VERSION|GRE_ROUTING))
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return;
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if (flags&GRE_KEY) {
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grehlen += 4;
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if (flags&GRE_CSUM)
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grehlen += 4;
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}
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}
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/* If only 8 bytes returned, keyed message will be dropped here */
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if (!pskb_may_pull(skb, grehlen))
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return;
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ipv6h = (const struct ipv6hdr *)skb->data;
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p = (__be16 *)(skb->data + offset);
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t = ip6gre_tunnel_lookup(skb->dev, &ipv6h->daddr, &ipv6h->saddr,
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flags & GRE_KEY ?
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*(((__be32 *)p) + (grehlen / 4) - 1) : 0,
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p[1]);
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if (t == NULL)
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return;
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switch (type) {
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__u32 teli;
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struct ipv6_tlv_tnl_enc_lim *tel;
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__u32 mtu;
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case ICMPV6_DEST_UNREACH:
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net_warn_ratelimited("%s: Path to destination invalid or inactive!\n",
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t->parms.name);
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break;
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case ICMPV6_TIME_EXCEED:
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if (code == ICMPV6_EXC_HOPLIMIT) {
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net_warn_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
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t->parms.name);
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}
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break;
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case ICMPV6_PARAMPROB:
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teli = 0;
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if (code == ICMPV6_HDR_FIELD)
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teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
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|
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if (teli && teli == info - 2) {
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tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
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if (tel->encap_limit == 0) {
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net_warn_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
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t->parms.name);
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}
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} else {
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net_warn_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
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t->parms.name);
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}
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break;
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case ICMPV6_PKT_TOOBIG:
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mtu = info - offset;
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if (mtu < IPV6_MIN_MTU)
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mtu = IPV6_MIN_MTU;
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t->dev->mtu = mtu;
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break;
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}
|
|
|
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if (time_before(jiffies, t->err_time + IP6TUNNEL_ERR_TIMEO))
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t->err_count++;
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else
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t->err_count = 1;
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t->err_time = jiffies;
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}
|
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|
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static int ip6gre_rcv(struct sk_buff *skb)
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{
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const struct ipv6hdr *ipv6h;
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u8 *h;
|
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__be16 flags;
|
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__sum16 csum = 0;
|
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__be32 key = 0;
|
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u32 seqno = 0;
|
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struct ip6_tnl *tunnel;
|
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int offset = 4;
|
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__be16 gre_proto;
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int err;
|
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|
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if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
|
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goto drop;
|
|
|
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ipv6h = ipv6_hdr(skb);
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h = skb->data;
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flags = *(__be16 *)h;
|
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|
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if (flags&(GRE_CSUM|GRE_KEY|GRE_ROUTING|GRE_SEQ|GRE_VERSION)) {
|
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/* - Version must be 0.
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- We do not support routing headers.
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*/
|
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if (flags&(GRE_VERSION|GRE_ROUTING))
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goto drop;
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|
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if (flags&GRE_CSUM) {
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switch (skb->ip_summed) {
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case CHECKSUM_COMPLETE:
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csum = csum_fold(skb->csum);
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if (!csum)
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break;
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/* fall through */
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case CHECKSUM_NONE:
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skb->csum = 0;
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csum = __skb_checksum_complete(skb);
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skb->ip_summed = CHECKSUM_COMPLETE;
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}
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offset += 4;
|
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}
|
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if (flags&GRE_KEY) {
|
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key = *(__be32 *)(h + offset);
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offset += 4;
|
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}
|
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if (flags&GRE_SEQ) {
|
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seqno = ntohl(*(__be32 *)(h + offset));
|
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offset += 4;
|
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}
|
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}
|
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|
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gre_proto = *(__be16 *)(h + 2);
|
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|
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tunnel = ip6gre_tunnel_lookup(skb->dev,
|
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&ipv6h->saddr, &ipv6h->daddr, key,
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gre_proto);
|
|
if (tunnel) {
|
|
struct pcpu_sw_netstats *tstats;
|
|
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto drop;
|
|
|
|
if (!ip6_tnl_rcv_ctl(tunnel, &ipv6h->daddr, &ipv6h->saddr)) {
|
|
tunnel->dev->stats.rx_dropped++;
|
|
goto drop;
|
|
}
|
|
|
|
skb->protocol = gre_proto;
|
|
/* WCCP version 1 and 2 protocol decoding.
|
|
* - Change protocol to IP
|
|
* - When dealing with WCCPv2, Skip extra 4 bytes in GRE header
|
|
*/
|
|
if (flags == 0 && gre_proto == htons(ETH_P_WCCP)) {
|
|
skb->protocol = htons(ETH_P_IP);
|
|
if ((*(h + offset) & 0xF0) != 0x40)
|
|
offset += 4;
|
|
}
|
|
|
|
skb->mac_header = skb->network_header;
|
|
__pskb_pull(skb, offset);
|
|
skb_postpull_rcsum(skb, skb_transport_header(skb), offset);
|
|
|
|
if (((flags&GRE_CSUM) && csum) ||
|
|
(!(flags&GRE_CSUM) && tunnel->parms.i_flags&GRE_CSUM)) {
|
|
tunnel->dev->stats.rx_crc_errors++;
|
|
tunnel->dev->stats.rx_errors++;
|
|
goto drop;
|
|
}
|
|
if (tunnel->parms.i_flags&GRE_SEQ) {
|
|
if (!(flags&GRE_SEQ) ||
|
|
(tunnel->i_seqno &&
|
|
(s32)(seqno - tunnel->i_seqno) < 0)) {
|
|
tunnel->dev->stats.rx_fifo_errors++;
|
|
tunnel->dev->stats.rx_errors++;
|
|
goto drop;
|
|
}
|
|
tunnel->i_seqno = seqno + 1;
|
|
}
|
|
|
|
/* Warning: All skb pointers will be invalidated! */
|
|
if (tunnel->dev->type == ARPHRD_ETHER) {
|
|
if (!pskb_may_pull(skb, ETH_HLEN)) {
|
|
tunnel->dev->stats.rx_length_errors++;
|
|
tunnel->dev->stats.rx_errors++;
|
|
goto drop;
|
|
}
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
skb->protocol = eth_type_trans(skb, tunnel->dev);
|
|
skb_postpull_rcsum(skb, eth_hdr(skb), ETH_HLEN);
|
|
}
|
|
|
|
__skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
|
|
|
|
skb_reset_network_header(skb);
|
|
|
|
err = IP6_ECN_decapsulate(ipv6h, skb);
|
|
if (unlikely(err)) {
|
|
if (log_ecn_error)
|
|
net_info_ratelimited("non-ECT from %pI6 with dsfield=%#x\n",
|
|
&ipv6h->saddr,
|
|
ipv6_get_dsfield(ipv6h));
|
|
if (err > 1) {
|
|
++tunnel->dev->stats.rx_frame_errors;
|
|
++tunnel->dev->stats.rx_errors;
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
tstats = this_cpu_ptr(tunnel->dev->tstats);
|
|
u64_stats_update_begin(&tstats->syncp);
|
|
tstats->rx_packets++;
|
|
tstats->rx_bytes += skb->len;
|
|
u64_stats_update_end(&tstats->syncp);
|
|
|
|
netif_rx(skb);
|
|
|
|
return 0;
|
|
}
|
|
icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
struct ipv6_tel_txoption {
|
|
struct ipv6_txoptions ops;
|
|
__u8 dst_opt[8];
|
|
};
|
|
|
|
static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
|
|
{
|
|
memset(opt, 0, sizeof(struct ipv6_tel_txoption));
|
|
|
|
opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
|
|
opt->dst_opt[3] = 1;
|
|
opt->dst_opt[4] = encap_limit;
|
|
opt->dst_opt[5] = IPV6_TLV_PADN;
|
|
opt->dst_opt[6] = 1;
|
|
|
|
opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
|
|
opt->ops.opt_nflen = 8;
|
|
}
|
|
|
|
static netdev_tx_t ip6gre_xmit2(struct sk_buff *skb,
|
|
struct net_device *dev,
|
|
__u8 dsfield,
|
|
struct flowi6 *fl6,
|
|
int encap_limit,
|
|
__u32 *pmtu)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct ip6_tnl *tunnel = netdev_priv(dev);
|
|
struct net_device *tdev; /* Device to other host */
|
|
struct ipv6hdr *ipv6h; /* Our new IP header */
|
|
unsigned int max_headroom = 0; /* The extra header space needed */
|
|
int gre_hlen;
|
|
struct ipv6_tel_txoption opt;
|
|
int mtu;
|
|
struct dst_entry *dst = NULL, *ndst = NULL;
|
|
struct net_device_stats *stats = &tunnel->dev->stats;
|
|
int err = -1;
|
|
u8 proto;
|
|
struct sk_buff *new_skb;
|
|
|
|
if (dev->type == ARPHRD_ETHER)
|
|
IPCB(skb)->flags = 0;
|
|
|
|
if (dev->header_ops && dev->type == ARPHRD_IP6GRE) {
|
|
gre_hlen = 0;
|
|
ipv6h = (struct ipv6hdr *)skb->data;
|
|
fl6->daddr = ipv6h->daddr;
|
|
} else {
|
|
gre_hlen = tunnel->hlen;
|
|
fl6->daddr = tunnel->parms.raddr;
|
|
}
|
|
|
|
if (!fl6->flowi6_mark)
|
|
dst = ip6_tnl_dst_check(tunnel);
|
|
|
|
if (!dst) {
|
|
ndst = ip6_route_output(net, NULL, fl6);
|
|
|
|
if (ndst->error)
|
|
goto tx_err_link_failure;
|
|
ndst = xfrm_lookup(net, ndst, flowi6_to_flowi(fl6), NULL, 0);
|
|
if (IS_ERR(ndst)) {
|
|
err = PTR_ERR(ndst);
|
|
ndst = NULL;
|
|
goto tx_err_link_failure;
|
|
}
|
|
dst = ndst;
|
|
}
|
|
|
|
tdev = dst->dev;
|
|
|
|
if (tdev == dev) {
|
|
stats->collisions++;
|
|
net_warn_ratelimited("%s: Local routing loop detected!\n",
|
|
tunnel->parms.name);
|
|
goto tx_err_dst_release;
|
|
}
|
|
|
|
mtu = dst_mtu(dst) - sizeof(*ipv6h);
|
|
if (encap_limit >= 0) {
|
|
max_headroom += 8;
|
|
mtu -= 8;
|
|
}
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
if (skb_dst(skb))
|
|
skb_dst(skb)->ops->update_pmtu(skb_dst(skb), NULL, skb, mtu);
|
|
if (skb->len > mtu) {
|
|
*pmtu = mtu;
|
|
err = -EMSGSIZE;
|
|
goto tx_err_dst_release;
|
|
}
|
|
|
|
if (tunnel->err_count > 0) {
|
|
if (time_before(jiffies,
|
|
tunnel->err_time + IP6TUNNEL_ERR_TIMEO)) {
|
|
tunnel->err_count--;
|
|
|
|
dst_link_failure(skb);
|
|
} else
|
|
tunnel->err_count = 0;
|
|
}
|
|
|
|
skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(dev)));
|
|
|
|
max_headroom += LL_RESERVED_SPACE(tdev) + gre_hlen + dst->header_len;
|
|
|
|
if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
|
|
(skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
|
|
new_skb = skb_realloc_headroom(skb, max_headroom);
|
|
if (max_headroom > dev->needed_headroom)
|
|
dev->needed_headroom = max_headroom;
|
|
if (!new_skb)
|
|
goto tx_err_dst_release;
|
|
|
|
if (skb->sk)
|
|
skb_set_owner_w(new_skb, skb->sk);
|
|
consume_skb(skb);
|
|
skb = new_skb;
|
|
}
|
|
|
|
if (fl6->flowi6_mark) {
|
|
skb_dst_set(skb, dst);
|
|
ndst = NULL;
|
|
} else {
|
|
skb_dst_set_noref(skb, dst);
|
|
}
|
|
|
|
proto = NEXTHDR_GRE;
|
|
if (encap_limit >= 0) {
|
|
init_tel_txopt(&opt, encap_limit);
|
|
ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
|
|
}
|
|
|
|
if (likely(!skb->encapsulation)) {
|
|
skb_reset_inner_headers(skb);
|
|
skb->encapsulation = 1;
|
|
}
|
|
|
|
skb_push(skb, gre_hlen);
|
|
skb_reset_network_header(skb);
|
|
skb_set_transport_header(skb, sizeof(*ipv6h));
|
|
|
|
/*
|
|
* Push down and install the IP header.
|
|
*/
|
|
ipv6h = ipv6_hdr(skb);
|
|
ip6_flow_hdr(ipv6h, INET_ECN_encapsulate(0, dsfield), fl6->flowlabel);
|
|
ipv6h->hop_limit = tunnel->parms.hop_limit;
|
|
ipv6h->nexthdr = proto;
|
|
ipv6h->saddr = fl6->saddr;
|
|
ipv6h->daddr = fl6->daddr;
|
|
|
|
((__be16 *)(ipv6h + 1))[0] = tunnel->parms.o_flags;
|
|
((__be16 *)(ipv6h + 1))[1] = (dev->type == ARPHRD_ETHER) ?
|
|
htons(ETH_P_TEB) : skb->protocol;
|
|
|
|
if (tunnel->parms.o_flags&(GRE_KEY|GRE_CSUM|GRE_SEQ)) {
|
|
__be32 *ptr = (__be32 *)(((u8 *)ipv6h) + tunnel->hlen - 4);
|
|
|
|
if (tunnel->parms.o_flags&GRE_SEQ) {
|
|
++tunnel->o_seqno;
|
|
*ptr = htonl(tunnel->o_seqno);
|
|
ptr--;
|
|
}
|
|
if (tunnel->parms.o_flags&GRE_KEY) {
|
|
*ptr = tunnel->parms.o_key;
|
|
ptr--;
|
|
}
|
|
if (tunnel->parms.o_flags&GRE_CSUM) {
|
|
*ptr = 0;
|
|
*(__sum16 *)ptr = ip_compute_csum((void *)(ipv6h+1),
|
|
skb->len - sizeof(struct ipv6hdr));
|
|
}
|
|
}
|
|
|
|
ip6tunnel_xmit(skb, dev);
|
|
if (ndst)
|
|
ip6_tnl_dst_store(tunnel, ndst);
|
|
return 0;
|
|
tx_err_link_failure:
|
|
stats->tx_carrier_errors++;
|
|
dst_link_failure(skb);
|
|
tx_err_dst_release:
|
|
dst_release(ndst);
|
|
return err;
|
|
}
|
|
|
|
static inline int ip6gre_xmit_ipv4(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
int encap_limit = -1;
|
|
struct flowi6 fl6;
|
|
__u8 dsfield;
|
|
__u32 mtu;
|
|
int err;
|
|
|
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
|
|
encap_limit = t->parms.encap_limit;
|
|
|
|
memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
|
|
fl6.flowi6_proto = IPPROTO_IPIP;
|
|
|
|
dsfield = ipv4_get_dsfield(iph);
|
|
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
|
|
fl6.flowlabel |= htonl((__u32)iph->tos << IPV6_TCLASS_SHIFT)
|
|
& IPV6_TCLASS_MASK;
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
|
|
fl6.flowi6_mark = skb->mark;
|
|
|
|
err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
|
|
if (err != 0) {
|
|
/* XXX: send ICMP error even if DF is not set. */
|
|
if (err == -EMSGSIZE)
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED,
|
|
htonl(mtu));
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int ip6gre_xmit_ipv6(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
|
int encap_limit = -1;
|
|
__u16 offset;
|
|
struct flowi6 fl6;
|
|
__u8 dsfield;
|
|
__u32 mtu;
|
|
int err;
|
|
|
|
if (ipv6_addr_equal(&t->parms.raddr, &ipv6h->saddr))
|
|
return -1;
|
|
|
|
offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
|
|
if (offset > 0) {
|
|
struct ipv6_tlv_tnl_enc_lim *tel;
|
|
tel = (struct ipv6_tlv_tnl_enc_lim *)&skb_network_header(skb)[offset];
|
|
if (tel->encap_limit == 0) {
|
|
icmpv6_send(skb, ICMPV6_PARAMPROB,
|
|
ICMPV6_HDR_FIELD, offset + 2);
|
|
return -1;
|
|
}
|
|
encap_limit = tel->encap_limit - 1;
|
|
} else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
|
|
encap_limit = t->parms.encap_limit;
|
|
|
|
memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
|
|
fl6.flowi6_proto = IPPROTO_IPV6;
|
|
|
|
dsfield = ipv6_get_dsfield(ipv6h);
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
|
|
fl6.flowlabel |= (*(__be32 *) ipv6h & IPV6_TCLASS_MASK);
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL)
|
|
fl6.flowlabel |= ip6_flowlabel(ipv6h);
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
|
|
fl6.flowi6_mark = skb->mark;
|
|
|
|
err = ip6gre_xmit2(skb, dev, dsfield, &fl6, encap_limit, &mtu);
|
|
if (err != 0) {
|
|
if (err == -EMSGSIZE)
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_addr_conflict - compare packet addresses to tunnel's own
|
|
* @t: the outgoing tunnel device
|
|
* @hdr: IPv6 header from the incoming packet
|
|
*
|
|
* Description:
|
|
* Avoid trivial tunneling loop by checking that tunnel exit-point
|
|
* doesn't match source of incoming packet.
|
|
*
|
|
* Return:
|
|
* 1 if conflict,
|
|
* 0 else
|
|
**/
|
|
|
|
static inline bool ip6gre_tnl_addr_conflict(const struct ip6_tnl *t,
|
|
const struct ipv6hdr *hdr)
|
|
{
|
|
return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
|
|
}
|
|
|
|
static int ip6gre_xmit_other(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
int encap_limit = -1;
|
|
struct flowi6 fl6;
|
|
__u32 mtu;
|
|
int err;
|
|
|
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
|
|
encap_limit = t->parms.encap_limit;
|
|
|
|
memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6));
|
|
fl6.flowi6_proto = skb->protocol;
|
|
|
|
err = ip6gre_xmit2(skb, dev, 0, &fl6, encap_limit, &mtu);
|
|
|
|
return err;
|
|
}
|
|
|
|
static netdev_tx_t ip6gre_tunnel_xmit(struct sk_buff *skb,
|
|
struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct net_device_stats *stats = &t->dev->stats;
|
|
int ret;
|
|
|
|
if (!ip6_tnl_xmit_ctl(t))
|
|
goto tx_err;
|
|
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
ret = ip6gre_xmit_ipv4(skb, dev);
|
|
break;
|
|
case htons(ETH_P_IPV6):
|
|
ret = ip6gre_xmit_ipv6(skb, dev);
|
|
break;
|
|
default:
|
|
ret = ip6gre_xmit_other(skb, dev);
|
|
break;
|
|
}
|
|
|
|
if (ret < 0)
|
|
goto tx_err;
|
|
|
|
return NETDEV_TX_OK;
|
|
|
|
tx_err:
|
|
stats->tx_errors++;
|
|
stats->tx_dropped++;
|
|
kfree_skb(skb);
|
|
return NETDEV_TX_OK;
|
|
}
|
|
|
|
static void ip6gre_tnl_link_config(struct ip6_tnl *t, int set_mtu)
|
|
{
|
|
struct net_device *dev = t->dev;
|
|
struct __ip6_tnl_parm *p = &t->parms;
|
|
struct flowi6 *fl6 = &t->fl.u.ip6;
|
|
int addend = sizeof(struct ipv6hdr) + 4;
|
|
|
|
if (dev->type != ARPHRD_ETHER) {
|
|
memcpy(dev->dev_addr, &p->laddr, sizeof(struct in6_addr));
|
|
memcpy(dev->broadcast, &p->raddr, sizeof(struct in6_addr));
|
|
}
|
|
|
|
/* Set up flowi template */
|
|
fl6->saddr = p->laddr;
|
|
fl6->daddr = p->raddr;
|
|
fl6->flowi6_oif = p->link;
|
|
fl6->flowlabel = 0;
|
|
|
|
if (!(p->flags&IP6_TNL_F_USE_ORIG_TCLASS))
|
|
fl6->flowlabel |= IPV6_TCLASS_MASK & p->flowinfo;
|
|
if (!(p->flags&IP6_TNL_F_USE_ORIG_FLOWLABEL))
|
|
fl6->flowlabel |= IPV6_FLOWLABEL_MASK & p->flowinfo;
|
|
|
|
p->flags &= ~(IP6_TNL_F_CAP_XMIT|IP6_TNL_F_CAP_RCV|IP6_TNL_F_CAP_PER_PACKET);
|
|
p->flags |= ip6_tnl_get_cap(t, &p->laddr, &p->raddr);
|
|
|
|
if (p->flags&IP6_TNL_F_CAP_XMIT &&
|
|
p->flags&IP6_TNL_F_CAP_RCV && dev->type != ARPHRD_ETHER)
|
|
dev->flags |= IFF_POINTOPOINT;
|
|
else
|
|
dev->flags &= ~IFF_POINTOPOINT;
|
|
|
|
dev->iflink = p->link;
|
|
|
|
/* Precalculate GRE options length */
|
|
if (t->parms.o_flags&(GRE_CSUM|GRE_KEY|GRE_SEQ)) {
|
|
if (t->parms.o_flags&GRE_CSUM)
|
|
addend += 4;
|
|
if (t->parms.o_flags&GRE_KEY)
|
|
addend += 4;
|
|
if (t->parms.o_flags&GRE_SEQ)
|
|
addend += 4;
|
|
}
|
|
t->hlen = addend;
|
|
|
|
if (p->flags & IP6_TNL_F_CAP_XMIT) {
|
|
int strict = (ipv6_addr_type(&p->raddr) &
|
|
(IPV6_ADDR_MULTICAST|IPV6_ADDR_LINKLOCAL));
|
|
|
|
struct rt6_info *rt = rt6_lookup(dev_net(dev),
|
|
&p->raddr, &p->laddr,
|
|
p->link, strict);
|
|
|
|
if (rt == NULL)
|
|
return;
|
|
|
|
if (rt->dst.dev) {
|
|
dev->hard_header_len = rt->dst.dev->hard_header_len + addend;
|
|
|
|
if (set_mtu) {
|
|
dev->mtu = rt->dst.dev->mtu - addend;
|
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
|
|
dev->mtu -= 8;
|
|
|
|
if (dev->mtu < IPV6_MIN_MTU)
|
|
dev->mtu = IPV6_MIN_MTU;
|
|
}
|
|
}
|
|
ip6_rt_put(rt);
|
|
}
|
|
}
|
|
|
|
static int ip6gre_tnl_change(struct ip6_tnl *t,
|
|
const struct __ip6_tnl_parm *p, int set_mtu)
|
|
{
|
|
t->parms.laddr = p->laddr;
|
|
t->parms.raddr = p->raddr;
|
|
t->parms.flags = p->flags;
|
|
t->parms.hop_limit = p->hop_limit;
|
|
t->parms.encap_limit = p->encap_limit;
|
|
t->parms.flowinfo = p->flowinfo;
|
|
t->parms.link = p->link;
|
|
t->parms.proto = p->proto;
|
|
t->parms.i_key = p->i_key;
|
|
t->parms.o_key = p->o_key;
|
|
t->parms.i_flags = p->i_flags;
|
|
t->parms.o_flags = p->o_flags;
|
|
ip6_tnl_dst_reset(t);
|
|
ip6gre_tnl_link_config(t, set_mtu);
|
|
return 0;
|
|
}
|
|
|
|
static void ip6gre_tnl_parm_from_user(struct __ip6_tnl_parm *p,
|
|
const struct ip6_tnl_parm2 *u)
|
|
{
|
|
p->laddr = u->laddr;
|
|
p->raddr = u->raddr;
|
|
p->flags = u->flags;
|
|
p->hop_limit = u->hop_limit;
|
|
p->encap_limit = u->encap_limit;
|
|
p->flowinfo = u->flowinfo;
|
|
p->link = u->link;
|
|
p->i_key = u->i_key;
|
|
p->o_key = u->o_key;
|
|
p->i_flags = u->i_flags;
|
|
p->o_flags = u->o_flags;
|
|
memcpy(p->name, u->name, sizeof(u->name));
|
|
}
|
|
|
|
static void ip6gre_tnl_parm_to_user(struct ip6_tnl_parm2 *u,
|
|
const struct __ip6_tnl_parm *p)
|
|
{
|
|
u->proto = IPPROTO_GRE;
|
|
u->laddr = p->laddr;
|
|
u->raddr = p->raddr;
|
|
u->flags = p->flags;
|
|
u->hop_limit = p->hop_limit;
|
|
u->encap_limit = p->encap_limit;
|
|
u->flowinfo = p->flowinfo;
|
|
u->link = p->link;
|
|
u->i_key = p->i_key;
|
|
u->o_key = p->o_key;
|
|
u->i_flags = p->i_flags;
|
|
u->o_flags = p->o_flags;
|
|
memcpy(u->name, p->name, sizeof(u->name));
|
|
}
|
|
|
|
static int ip6gre_tunnel_ioctl(struct net_device *dev,
|
|
struct ifreq *ifr, int cmd)
|
|
{
|
|
int err = 0;
|
|
struct ip6_tnl_parm2 p;
|
|
struct __ip6_tnl_parm p1;
|
|
struct ip6_tnl *t;
|
|
struct net *net = dev_net(dev);
|
|
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
|
|
|
|
switch (cmd) {
|
|
case SIOCGETTUNNEL:
|
|
t = NULL;
|
|
if (dev == ign->fb_tunnel_dev) {
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
ip6gre_tnl_parm_from_user(&p1, &p);
|
|
t = ip6gre_tunnel_locate(net, &p1, 0);
|
|
}
|
|
if (t == NULL)
|
|
t = netdev_priv(dev);
|
|
memset(&p, 0, sizeof(p));
|
|
ip6gre_tnl_parm_to_user(&p, &t->parms);
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case SIOCADDTUNNEL:
|
|
case SIOCCHGTUNNEL:
|
|
err = -EPERM;
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
goto done;
|
|
|
|
err = -EFAULT;
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
|
goto done;
|
|
|
|
err = -EINVAL;
|
|
if ((p.i_flags|p.o_flags)&(GRE_VERSION|GRE_ROUTING))
|
|
goto done;
|
|
|
|
if (!(p.i_flags&GRE_KEY))
|
|
p.i_key = 0;
|
|
if (!(p.o_flags&GRE_KEY))
|
|
p.o_key = 0;
|
|
|
|
ip6gre_tnl_parm_from_user(&p1, &p);
|
|
t = ip6gre_tunnel_locate(net, &p1, cmd == SIOCADDTUNNEL);
|
|
|
|
if (dev != ign->fb_tunnel_dev && cmd == SIOCCHGTUNNEL) {
|
|
if (t != NULL) {
|
|
if (t->dev != dev) {
|
|
err = -EEXIST;
|
|
break;
|
|
}
|
|
} else {
|
|
t = netdev_priv(dev);
|
|
|
|
ip6gre_tunnel_unlink(ign, t);
|
|
synchronize_net();
|
|
ip6gre_tnl_change(t, &p1, 1);
|
|
ip6gre_tunnel_link(ign, t);
|
|
netdev_state_change(dev);
|
|
}
|
|
}
|
|
|
|
if (t) {
|
|
err = 0;
|
|
|
|
memset(&p, 0, sizeof(p));
|
|
ip6gre_tnl_parm_to_user(&p, &t->parms);
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
|
|
err = -EFAULT;
|
|
} else
|
|
err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
|
|
break;
|
|
|
|
case SIOCDELTUNNEL:
|
|
err = -EPERM;
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
goto done;
|
|
|
|
if (dev == ign->fb_tunnel_dev) {
|
|
err = -EFAULT;
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
|
goto done;
|
|
err = -ENOENT;
|
|
ip6gre_tnl_parm_from_user(&p1, &p);
|
|
t = ip6gre_tunnel_locate(net, &p1, 0);
|
|
if (t == NULL)
|
|
goto done;
|
|
err = -EPERM;
|
|
if (t == netdev_priv(ign->fb_tunnel_dev))
|
|
goto done;
|
|
dev = t->dev;
|
|
}
|
|
unregister_netdevice(dev);
|
|
err = 0;
|
|
break;
|
|
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
|
|
done:
|
|
return err;
|
|
}
|
|
|
|
static int ip6gre_tunnel_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if (new_mtu < 68 ||
|
|
new_mtu > 0xFFF8 - dev->hard_header_len)
|
|
return -EINVAL;
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
|
|
static int ip6gre_header(struct sk_buff *skb, struct net_device *dev,
|
|
unsigned short type,
|
|
const void *daddr, const void *saddr, unsigned int len)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct ipv6hdr *ipv6h = (struct ipv6hdr *)skb_push(skb, t->hlen);
|
|
__be16 *p = (__be16 *)(ipv6h+1);
|
|
|
|
ip6_flow_hdr(ipv6h, 0, t->fl.u.ip6.flowlabel);
|
|
ipv6h->hop_limit = t->parms.hop_limit;
|
|
ipv6h->nexthdr = NEXTHDR_GRE;
|
|
ipv6h->saddr = t->parms.laddr;
|
|
ipv6h->daddr = t->parms.raddr;
|
|
|
|
p[0] = t->parms.o_flags;
|
|
p[1] = htons(type);
|
|
|
|
/*
|
|
* Set the source hardware address.
|
|
*/
|
|
|
|
if (saddr)
|
|
memcpy(&ipv6h->saddr, saddr, sizeof(struct in6_addr));
|
|
if (daddr)
|
|
memcpy(&ipv6h->daddr, daddr, sizeof(struct in6_addr));
|
|
if (!ipv6_addr_any(&ipv6h->daddr))
|
|
return t->hlen;
|
|
|
|
return -t->hlen;
|
|
}
|
|
|
|
static const struct header_ops ip6gre_header_ops = {
|
|
.create = ip6gre_header,
|
|
};
|
|
|
|
static const struct net_device_ops ip6gre_netdev_ops = {
|
|
.ndo_init = ip6gre_tunnel_init,
|
|
.ndo_uninit = ip6gre_tunnel_uninit,
|
|
.ndo_start_xmit = ip6gre_tunnel_xmit,
|
|
.ndo_do_ioctl = ip6gre_tunnel_ioctl,
|
|
.ndo_change_mtu = ip6gre_tunnel_change_mtu,
|
|
.ndo_get_stats64 = ip_tunnel_get_stats64,
|
|
};
|
|
|
|
static void ip6gre_dev_free(struct net_device *dev)
|
|
{
|
|
free_percpu(dev->tstats);
|
|
free_netdev(dev);
|
|
}
|
|
|
|
static void ip6gre_tunnel_setup(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t;
|
|
|
|
dev->netdev_ops = &ip6gre_netdev_ops;
|
|
dev->destructor = ip6gre_dev_free;
|
|
|
|
dev->type = ARPHRD_IP6GRE;
|
|
dev->hard_header_len = LL_MAX_HEADER + sizeof(struct ipv6hdr) + 4;
|
|
dev->mtu = ETH_DATA_LEN - sizeof(struct ipv6hdr) - 4;
|
|
t = netdev_priv(dev);
|
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
|
|
dev->mtu -= 8;
|
|
dev->flags |= IFF_NOARP;
|
|
dev->iflink = 0;
|
|
dev->addr_len = sizeof(struct in6_addr);
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
dev->priv_flags &= ~IFF_XMIT_DST_RELEASE;
|
|
}
|
|
|
|
static int ip6gre_tunnel_init(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *tunnel;
|
|
int i;
|
|
|
|
tunnel = netdev_priv(dev);
|
|
|
|
tunnel->dev = dev;
|
|
tunnel->net = dev_net(dev);
|
|
strcpy(tunnel->parms.name, dev->name);
|
|
|
|
memcpy(dev->dev_addr, &tunnel->parms.laddr, sizeof(struct in6_addr));
|
|
memcpy(dev->broadcast, &tunnel->parms.raddr, sizeof(struct in6_addr));
|
|
|
|
if (ipv6_addr_any(&tunnel->parms.raddr))
|
|
dev->header_ops = &ip6gre_header_ops;
|
|
|
|
dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
|
|
if (!dev->tstats)
|
|
return -ENOMEM;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct pcpu_sw_netstats *ip6gre_tunnel_stats;
|
|
ip6gre_tunnel_stats = per_cpu_ptr(dev->tstats, i);
|
|
u64_stats_init(&ip6gre_tunnel_stats->syncp);
|
|
}
|
|
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ip6gre_fb_tunnel_init(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *tunnel = netdev_priv(dev);
|
|
|
|
tunnel->dev = dev;
|
|
tunnel->net = dev_net(dev);
|
|
strcpy(tunnel->parms.name, dev->name);
|
|
|
|
tunnel->hlen = sizeof(struct ipv6hdr) + 4;
|
|
|
|
dev_hold(dev);
|
|
}
|
|
|
|
|
|
static struct inet6_protocol ip6gre_protocol __read_mostly = {
|
|
.handler = ip6gre_rcv,
|
|
.err_handler = ip6gre_err,
|
|
.flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL,
|
|
};
|
|
|
|
static void ip6gre_destroy_tunnels(struct ip6gre_net *ign,
|
|
struct list_head *head)
|
|
{
|
|
int prio;
|
|
|
|
for (prio = 0; prio < 4; prio++) {
|
|
int h;
|
|
for (h = 0; h < HASH_SIZE; h++) {
|
|
struct ip6_tnl *t;
|
|
|
|
t = rtnl_dereference(ign->tunnels[prio][h]);
|
|
|
|
while (t != NULL) {
|
|
unregister_netdevice_queue(t->dev, head);
|
|
t = rtnl_dereference(t->next);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __net_init ip6gre_init_net(struct net *net)
|
|
{
|
|
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
|
|
int err;
|
|
|
|
ign->fb_tunnel_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6gre0",
|
|
ip6gre_tunnel_setup);
|
|
if (!ign->fb_tunnel_dev) {
|
|
err = -ENOMEM;
|
|
goto err_alloc_dev;
|
|
}
|
|
dev_net_set(ign->fb_tunnel_dev, net);
|
|
|
|
ip6gre_fb_tunnel_init(ign->fb_tunnel_dev);
|
|
ign->fb_tunnel_dev->rtnl_link_ops = &ip6gre_link_ops;
|
|
|
|
err = register_netdev(ign->fb_tunnel_dev);
|
|
if (err)
|
|
goto err_reg_dev;
|
|
|
|
rcu_assign_pointer(ign->tunnels_wc[0],
|
|
netdev_priv(ign->fb_tunnel_dev));
|
|
return 0;
|
|
|
|
err_reg_dev:
|
|
ip6gre_dev_free(ign->fb_tunnel_dev);
|
|
err_alloc_dev:
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit ip6gre_exit_net(struct net *net)
|
|
{
|
|
struct ip6gre_net *ign;
|
|
LIST_HEAD(list);
|
|
|
|
ign = net_generic(net, ip6gre_net_id);
|
|
rtnl_lock();
|
|
ip6gre_destroy_tunnels(ign, &list);
|
|
unregister_netdevice_many(&list);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations ip6gre_net_ops = {
|
|
.init = ip6gre_init_net,
|
|
.exit = ip6gre_exit_net,
|
|
.id = &ip6gre_net_id,
|
|
.size = sizeof(struct ip6gre_net),
|
|
};
|
|
|
|
static int ip6gre_tunnel_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
__be16 flags;
|
|
|
|
if (!data)
|
|
return 0;
|
|
|
|
flags = 0;
|
|
if (data[IFLA_GRE_IFLAGS])
|
|
flags |= nla_get_be16(data[IFLA_GRE_IFLAGS]);
|
|
if (data[IFLA_GRE_OFLAGS])
|
|
flags |= nla_get_be16(data[IFLA_GRE_OFLAGS]);
|
|
if (flags & (GRE_VERSION|GRE_ROUTING))
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ip6gre_tap_validate(struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct in6_addr daddr;
|
|
|
|
if (tb[IFLA_ADDRESS]) {
|
|
if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN)
|
|
return -EINVAL;
|
|
if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS])))
|
|
return -EADDRNOTAVAIL;
|
|
}
|
|
|
|
if (!data)
|
|
goto out;
|
|
|
|
if (data[IFLA_GRE_REMOTE]) {
|
|
nla_memcpy(&daddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
|
|
if (ipv6_addr_any(&daddr))
|
|
return -EINVAL;
|
|
}
|
|
|
|
out:
|
|
return ip6gre_tunnel_validate(tb, data);
|
|
}
|
|
|
|
|
|
static void ip6gre_netlink_parms(struct nlattr *data[],
|
|
struct __ip6_tnl_parm *parms)
|
|
{
|
|
memset(parms, 0, sizeof(*parms));
|
|
|
|
if (!data)
|
|
return;
|
|
|
|
if (data[IFLA_GRE_LINK])
|
|
parms->link = nla_get_u32(data[IFLA_GRE_LINK]);
|
|
|
|
if (data[IFLA_GRE_IFLAGS])
|
|
parms->i_flags = nla_get_be16(data[IFLA_GRE_IFLAGS]);
|
|
|
|
if (data[IFLA_GRE_OFLAGS])
|
|
parms->o_flags = nla_get_be16(data[IFLA_GRE_OFLAGS]);
|
|
|
|
if (data[IFLA_GRE_IKEY])
|
|
parms->i_key = nla_get_be32(data[IFLA_GRE_IKEY]);
|
|
|
|
if (data[IFLA_GRE_OKEY])
|
|
parms->o_key = nla_get_be32(data[IFLA_GRE_OKEY]);
|
|
|
|
if (data[IFLA_GRE_LOCAL])
|
|
nla_memcpy(&parms->laddr, data[IFLA_GRE_LOCAL], sizeof(struct in6_addr));
|
|
|
|
if (data[IFLA_GRE_REMOTE])
|
|
nla_memcpy(&parms->raddr, data[IFLA_GRE_REMOTE], sizeof(struct in6_addr));
|
|
|
|
if (data[IFLA_GRE_TTL])
|
|
parms->hop_limit = nla_get_u8(data[IFLA_GRE_TTL]);
|
|
|
|
if (data[IFLA_GRE_ENCAP_LIMIT])
|
|
parms->encap_limit = nla_get_u8(data[IFLA_GRE_ENCAP_LIMIT]);
|
|
|
|
if (data[IFLA_GRE_FLOWINFO])
|
|
parms->flowinfo = nla_get_u32(data[IFLA_GRE_FLOWINFO]);
|
|
|
|
if (data[IFLA_GRE_FLAGS])
|
|
parms->flags = nla_get_u32(data[IFLA_GRE_FLAGS]);
|
|
}
|
|
|
|
static int ip6gre_tap_init(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *tunnel;
|
|
int i;
|
|
|
|
tunnel = netdev_priv(dev);
|
|
|
|
tunnel->dev = dev;
|
|
tunnel->net = dev_net(dev);
|
|
strcpy(tunnel->parms.name, dev->name);
|
|
|
|
ip6gre_tnl_link_config(tunnel, 1);
|
|
|
|
dev->tstats = alloc_percpu(struct pcpu_sw_netstats);
|
|
if (!dev->tstats)
|
|
return -ENOMEM;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct pcpu_sw_netstats *ip6gre_tap_stats;
|
|
ip6gre_tap_stats = per_cpu_ptr(dev->tstats, i);
|
|
u64_stats_init(&ip6gre_tap_stats->syncp);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct net_device_ops ip6gre_tap_netdev_ops = {
|
|
.ndo_init = ip6gre_tap_init,
|
|
.ndo_uninit = ip6gre_tunnel_uninit,
|
|
.ndo_start_xmit = ip6gre_tunnel_xmit,
|
|
.ndo_set_mac_address = eth_mac_addr,
|
|
.ndo_validate_addr = eth_validate_addr,
|
|
.ndo_change_mtu = ip6gre_tunnel_change_mtu,
|
|
.ndo_get_stats64 = ip_tunnel_get_stats64,
|
|
};
|
|
|
|
static void ip6gre_tap_setup(struct net_device *dev)
|
|
{
|
|
|
|
ether_setup(dev);
|
|
|
|
dev->netdev_ops = &ip6gre_tap_netdev_ops;
|
|
dev->destructor = ip6gre_dev_free;
|
|
|
|
dev->iflink = 0;
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
}
|
|
|
|
static int ip6gre_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[])
|
|
{
|
|
struct ip6_tnl *nt;
|
|
struct net *net = dev_net(dev);
|
|
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
|
|
int err;
|
|
|
|
nt = netdev_priv(dev);
|
|
ip6gre_netlink_parms(data, &nt->parms);
|
|
|
|
if (ip6gre_tunnel_find(net, &nt->parms, dev->type))
|
|
return -EEXIST;
|
|
|
|
if (dev->type == ARPHRD_ETHER && !tb[IFLA_ADDRESS])
|
|
eth_hw_addr_random(dev);
|
|
|
|
nt->dev = dev;
|
|
nt->net = dev_net(dev);
|
|
ip6gre_tnl_link_config(nt, !tb[IFLA_MTU]);
|
|
|
|
/* Can use a lockless transmit, unless we generate output sequences */
|
|
if (!(nt->parms.o_flags & GRE_SEQ))
|
|
dev->features |= NETIF_F_LLTX;
|
|
|
|
err = register_netdevice(dev);
|
|
if (err)
|
|
goto out;
|
|
|
|
dev_hold(dev);
|
|
ip6gre_tunnel_link(ign, nt);
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static int ip6gre_changelink(struct net_device *dev, struct nlattr *tb[],
|
|
struct nlattr *data[])
|
|
{
|
|
struct ip6_tnl *t, *nt;
|
|
struct net *net = dev_net(dev);
|
|
struct ip6gre_net *ign = net_generic(net, ip6gre_net_id);
|
|
struct __ip6_tnl_parm p;
|
|
|
|
if (dev == ign->fb_tunnel_dev)
|
|
return -EINVAL;
|
|
|
|
nt = netdev_priv(dev);
|
|
ip6gre_netlink_parms(data, &p);
|
|
|
|
t = ip6gre_tunnel_locate(net, &p, 0);
|
|
|
|
if (t) {
|
|
if (t->dev != dev)
|
|
return -EEXIST;
|
|
} else {
|
|
t = nt;
|
|
|
|
ip6gre_tunnel_unlink(ign, t);
|
|
ip6gre_tnl_change(t, &p, !tb[IFLA_MTU]);
|
|
ip6gre_tunnel_link(ign, t);
|
|
netdev_state_change(dev);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static size_t ip6gre_get_size(const struct net_device *dev)
|
|
{
|
|
return
|
|
/* IFLA_GRE_LINK */
|
|
nla_total_size(4) +
|
|
/* IFLA_GRE_IFLAGS */
|
|
nla_total_size(2) +
|
|
/* IFLA_GRE_OFLAGS */
|
|
nla_total_size(2) +
|
|
/* IFLA_GRE_IKEY */
|
|
nla_total_size(4) +
|
|
/* IFLA_GRE_OKEY */
|
|
nla_total_size(4) +
|
|
/* IFLA_GRE_LOCAL */
|
|
nla_total_size(sizeof(struct in6_addr)) +
|
|
/* IFLA_GRE_REMOTE */
|
|
nla_total_size(sizeof(struct in6_addr)) +
|
|
/* IFLA_GRE_TTL */
|
|
nla_total_size(1) +
|
|
/* IFLA_GRE_TOS */
|
|
nla_total_size(1) +
|
|
/* IFLA_GRE_ENCAP_LIMIT */
|
|
nla_total_size(1) +
|
|
/* IFLA_GRE_FLOWINFO */
|
|
nla_total_size(4) +
|
|
/* IFLA_GRE_FLAGS */
|
|
nla_total_size(4) +
|
|
0;
|
|
}
|
|
|
|
static int ip6gre_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct __ip6_tnl_parm *p = &t->parms;
|
|
|
|
if (nla_put_u32(skb, IFLA_GRE_LINK, p->link) ||
|
|
nla_put_be16(skb, IFLA_GRE_IFLAGS, p->i_flags) ||
|
|
nla_put_be16(skb, IFLA_GRE_OFLAGS, p->o_flags) ||
|
|
nla_put_be32(skb, IFLA_GRE_IKEY, p->i_key) ||
|
|
nla_put_be32(skb, IFLA_GRE_OKEY, p->o_key) ||
|
|
nla_put(skb, IFLA_GRE_LOCAL, sizeof(struct in6_addr), &p->laddr) ||
|
|
nla_put(skb, IFLA_GRE_REMOTE, sizeof(struct in6_addr), &p->raddr) ||
|
|
nla_put_u8(skb, IFLA_GRE_TTL, p->hop_limit) ||
|
|
/*nla_put_u8(skb, IFLA_GRE_TOS, t->priority) ||*/
|
|
nla_put_u8(skb, IFLA_GRE_ENCAP_LIMIT, p->encap_limit) ||
|
|
nla_put_be32(skb, IFLA_GRE_FLOWINFO, p->flowinfo) ||
|
|
nla_put_u32(skb, IFLA_GRE_FLAGS, p->flags))
|
|
goto nla_put_failure;
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static const struct nla_policy ip6gre_policy[IFLA_GRE_MAX + 1] = {
|
|
[IFLA_GRE_LINK] = { .type = NLA_U32 },
|
|
[IFLA_GRE_IFLAGS] = { .type = NLA_U16 },
|
|
[IFLA_GRE_OFLAGS] = { .type = NLA_U16 },
|
|
[IFLA_GRE_IKEY] = { .type = NLA_U32 },
|
|
[IFLA_GRE_OKEY] = { .type = NLA_U32 },
|
|
[IFLA_GRE_LOCAL] = { .len = FIELD_SIZEOF(struct ipv6hdr, saddr) },
|
|
[IFLA_GRE_REMOTE] = { .len = FIELD_SIZEOF(struct ipv6hdr, daddr) },
|
|
[IFLA_GRE_TTL] = { .type = NLA_U8 },
|
|
[IFLA_GRE_ENCAP_LIMIT] = { .type = NLA_U8 },
|
|
[IFLA_GRE_FLOWINFO] = { .type = NLA_U32 },
|
|
[IFLA_GRE_FLAGS] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static struct rtnl_link_ops ip6gre_link_ops __read_mostly = {
|
|
.kind = "ip6gre",
|
|
.maxtype = IFLA_GRE_MAX,
|
|
.policy = ip6gre_policy,
|
|
.priv_size = sizeof(struct ip6_tnl),
|
|
.setup = ip6gre_tunnel_setup,
|
|
.validate = ip6gre_tunnel_validate,
|
|
.newlink = ip6gre_newlink,
|
|
.changelink = ip6gre_changelink,
|
|
.get_size = ip6gre_get_size,
|
|
.fill_info = ip6gre_fill_info,
|
|
};
|
|
|
|
static struct rtnl_link_ops ip6gre_tap_ops __read_mostly = {
|
|
.kind = "ip6gretap",
|
|
.maxtype = IFLA_GRE_MAX,
|
|
.policy = ip6gre_policy,
|
|
.priv_size = sizeof(struct ip6_tnl),
|
|
.setup = ip6gre_tap_setup,
|
|
.validate = ip6gre_tap_validate,
|
|
.newlink = ip6gre_newlink,
|
|
.changelink = ip6gre_changelink,
|
|
.get_size = ip6gre_get_size,
|
|
.fill_info = ip6gre_fill_info,
|
|
};
|
|
|
|
/*
|
|
* And now the modules code and kernel interface.
|
|
*/
|
|
|
|
static int __init ip6gre_init(void)
|
|
{
|
|
int err;
|
|
|
|
pr_info("GRE over IPv6 tunneling driver\n");
|
|
|
|
err = register_pernet_device(&ip6gre_net_ops);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
err = inet6_add_protocol(&ip6gre_protocol, IPPROTO_GRE);
|
|
if (err < 0) {
|
|
pr_info("%s: can't add protocol\n", __func__);
|
|
goto add_proto_failed;
|
|
}
|
|
|
|
err = rtnl_link_register(&ip6gre_link_ops);
|
|
if (err < 0)
|
|
goto rtnl_link_failed;
|
|
|
|
err = rtnl_link_register(&ip6gre_tap_ops);
|
|
if (err < 0)
|
|
goto tap_ops_failed;
|
|
|
|
out:
|
|
return err;
|
|
|
|
tap_ops_failed:
|
|
rtnl_link_unregister(&ip6gre_link_ops);
|
|
rtnl_link_failed:
|
|
inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
|
|
add_proto_failed:
|
|
unregister_pernet_device(&ip6gre_net_ops);
|
|
goto out;
|
|
}
|
|
|
|
static void __exit ip6gre_fini(void)
|
|
{
|
|
rtnl_link_unregister(&ip6gre_tap_ops);
|
|
rtnl_link_unregister(&ip6gre_link_ops);
|
|
inet6_del_protocol(&ip6gre_protocol, IPPROTO_GRE);
|
|
unregister_pernet_device(&ip6gre_net_ops);
|
|
}
|
|
|
|
module_init(ip6gre_init);
|
|
module_exit(ip6gre_fini);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("D. Kozlov (xeb@mail.ru)");
|
|
MODULE_DESCRIPTION("GRE over IPv6 tunneling device");
|
|
MODULE_ALIAS_RTNL_LINK("ip6gre");
|
|
MODULE_ALIAS_NETDEV("ip6gre0");
|