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![Willem de Bruijn](/assets/img/avatar_default.png)
KMSAN detected read beyond end of buffer in vti and sit devices when passing truncated packets with PF_PACKET. The issue affects additional ip tunnel devices. Extend commit76c0ddd8c3
("ip6_tunnel: be careful when accessing the inner header") and commitccfec9e5cb
("ip_tunnel: be careful when accessing the inner header"). Move the check to a separate helper and call at the start of each ndo_start_xmit function in net/ipv4 and net/ipv6. Minor changes: - convert dev_kfree_skb to kfree_skb on error path, as dev_kfree_skb calls consume_skb which is not for error paths. - use pskb_network_may_pull even though that is pedantic here, as the same as pskb_may_pull for devices without llheaders. - do not cache ipv6 hdrs if used only once (unsafe across pskb_may_pull, was more relevant to earlier patch) Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2346 lines
57 KiB
C
2346 lines
57 KiB
C
/*
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* IPv6 tunneling device
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* Linux INET6 implementation
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*
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* Authors:
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* Ville Nuorvala <vnuorval@tcs.hut.fi>
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* Yasuyuki Kozakai <kozakai@linux-ipv6.org>
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*
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* Based on:
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* linux/net/ipv6/sit.c and linux/net/ipv4/ipip.c
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*
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* RFC 2473
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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/module.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/sockios.h>
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#include <linux/icmp.h>
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#include <linux/if.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/net.h>
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#include <linux/in6.h>
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#include <linux/netdevice.h>
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#include <linux/if_arp.h>
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#include <linux/icmpv6.h>
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#include <linux/init.h>
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#include <linux/route.h>
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#include <linux/rtnetlink.h>
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#include <linux/netfilter_ipv6.h>
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#include <linux/slab.h>
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#include <linux/hash.h>
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#include <linux/etherdevice.h>
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#include <linux/uaccess.h>
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#include <linux/atomic.h>
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#include <net/icmp.h>
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#include <net/ip.h>
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#include <net/ip_tunnels.h>
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#include <net/ipv6.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <net/ip6_tunnel.h>
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#include <net/xfrm.h>
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#include <net/dsfield.h>
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#include <net/inet_ecn.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/dst_metadata.h>
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MODULE_AUTHOR("Ville Nuorvala");
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MODULE_DESCRIPTION("IPv6 tunneling device");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_RTNL_LINK("ip6tnl");
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MODULE_ALIAS_NETDEV("ip6tnl0");
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#define IP6_TUNNEL_HASH_SIZE_SHIFT 5
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#define IP6_TUNNEL_HASH_SIZE (1 << IP6_TUNNEL_HASH_SIZE_SHIFT)
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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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static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
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{
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u32 hash = ipv6_addr_hash(addr1) ^ ipv6_addr_hash(addr2);
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return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT);
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}
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static int ip6_tnl_dev_init(struct net_device *dev);
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static void ip6_tnl_dev_setup(struct net_device *dev);
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static struct rtnl_link_ops ip6_link_ops __read_mostly;
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static unsigned int ip6_tnl_net_id __read_mostly;
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struct ip6_tnl_net {
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/* the IPv6 tunnel fallback device */
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struct net_device *fb_tnl_dev;
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/* lists for storing tunnels in use */
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struct ip6_tnl __rcu *tnls_r_l[IP6_TUNNEL_HASH_SIZE];
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struct ip6_tnl __rcu *tnls_wc[1];
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struct ip6_tnl __rcu **tnls[2];
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struct ip6_tnl __rcu *collect_md_tun;
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};
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static struct net_device_stats *ip6_get_stats(struct net_device *dev)
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{
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struct pcpu_sw_netstats tmp, sum = { 0 };
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int i;
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for_each_possible_cpu(i) {
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unsigned int start;
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const struct pcpu_sw_netstats *tstats =
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per_cpu_ptr(dev->tstats, i);
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do {
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start = u64_stats_fetch_begin_irq(&tstats->syncp);
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tmp.rx_packets = tstats->rx_packets;
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tmp.rx_bytes = tstats->rx_bytes;
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tmp.tx_packets = tstats->tx_packets;
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tmp.tx_bytes = tstats->tx_bytes;
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} while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
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sum.rx_packets += tmp.rx_packets;
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sum.rx_bytes += tmp.rx_bytes;
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sum.tx_packets += tmp.tx_packets;
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sum.tx_bytes += tmp.tx_bytes;
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}
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dev->stats.rx_packets = sum.rx_packets;
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dev->stats.rx_bytes = sum.rx_bytes;
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dev->stats.tx_packets = sum.tx_packets;
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dev->stats.tx_bytes = sum.tx_bytes;
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return &dev->stats;
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}
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/**
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* ip6_tnl_lookup - fetch tunnel matching the end-point addresses
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* @remote: the address of the tunnel exit-point
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* @local: the address of the tunnel entry-point
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*
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* Return:
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* tunnel matching given end-points if found,
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* else fallback tunnel if its device is up,
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* else %NULL
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**/
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#define for_each_ip6_tunnel_rcu(start) \
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for (t = rcu_dereference(start); t; t = rcu_dereference(t->next))
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static struct ip6_tnl *
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ip6_tnl_lookup(struct net *net, const struct in6_addr *remote, const struct in6_addr *local)
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{
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unsigned int hash = HASH(remote, local);
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struct ip6_tnl *t;
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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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struct in6_addr any;
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for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
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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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(t->dev->flags & IFF_UP))
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return t;
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}
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memset(&any, 0, sizeof(any));
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hash = HASH(&any, local);
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for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
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if (ipv6_addr_equal(local, &t->parms.laddr) &&
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ipv6_addr_any(&t->parms.raddr) &&
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(t->dev->flags & IFF_UP))
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return t;
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}
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hash = HASH(remote, &any);
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for_each_ip6_tunnel_rcu(ip6n->tnls_r_l[hash]) {
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if (ipv6_addr_equal(remote, &t->parms.raddr) &&
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ipv6_addr_any(&t->parms.laddr) &&
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(t->dev->flags & IFF_UP))
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return t;
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}
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t = rcu_dereference(ip6n->collect_md_tun);
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if (t && t->dev->flags & IFF_UP)
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return t;
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t = rcu_dereference(ip6n->tnls_wc[0]);
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if (t && (t->dev->flags & IFF_UP))
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return t;
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return NULL;
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}
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/**
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* ip6_tnl_bucket - get head of list matching given tunnel parameters
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* @p: parameters containing tunnel end-points
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*
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* Description:
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* ip6_tnl_bucket() returns the head of the list matching the
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* &struct in6_addr entries laddr and raddr in @p.
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*
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* Return: head of IPv6 tunnel list
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**/
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static struct ip6_tnl __rcu **
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ip6_tnl_bucket(struct ip6_tnl_net *ip6n, 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 = 0;
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int prio = 0;
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if (!ipv6_addr_any(remote) || !ipv6_addr_any(local)) {
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prio = 1;
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h = HASH(remote, local);
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}
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return &ip6n->tnls[prio][h];
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}
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/**
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* ip6_tnl_link - add tunnel to hash table
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* @t: tunnel to be added
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**/
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static void
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ip6_tnl_link(struct ip6_tnl_net *ip6n, struct ip6_tnl *t)
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{
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struct ip6_tnl __rcu **tp = ip6_tnl_bucket(ip6n, &t->parms);
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if (t->parms.collect_md)
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rcu_assign_pointer(ip6n->collect_md_tun, 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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/**
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* ip6_tnl_unlink - remove tunnel from hash table
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* @t: tunnel to be removed
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**/
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static void
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ip6_tnl_unlink(struct ip6_tnl_net *ip6n, 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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if (t->parms.collect_md)
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rcu_assign_pointer(ip6n->collect_md_tun, NULL);
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for (tp = ip6_tnl_bucket(ip6n, &t->parms);
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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 void ip6_dev_free(struct net_device *dev)
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{
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struct ip6_tnl *t = netdev_priv(dev);
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gro_cells_destroy(&t->gro_cells);
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dst_cache_destroy(&t->dst_cache);
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free_percpu(dev->tstats);
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}
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static int ip6_tnl_create2(struct net_device *dev)
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{
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struct ip6_tnl *t = netdev_priv(dev);
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struct net *net = dev_net(dev);
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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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int err;
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t = netdev_priv(dev);
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dev->rtnl_link_ops = &ip6_link_ops;
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err = register_netdevice(dev);
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if (err < 0)
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goto out;
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strcpy(t->parms.name, dev->name);
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dev_hold(dev);
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ip6_tnl_link(ip6n, t);
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return 0;
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out:
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return err;
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}
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/**
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* ip6_tnl_create - create a new tunnel
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* @p: tunnel parameters
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* @pt: pointer to new tunnel
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*
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* Description:
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* Create tunnel matching given parameters.
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*
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* Return:
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* created tunnel or error pointer
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**/
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static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
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{
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struct net_device *dev;
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struct ip6_tnl *t;
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char name[IFNAMSIZ];
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int err = -E2BIG;
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if (p->name[0]) {
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if (!dev_valid_name(p->name))
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goto failed;
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strlcpy(name, p->name, IFNAMSIZ);
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} else {
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sprintf(name, "ip6tnl%%d");
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}
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err = -ENOMEM;
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dev = alloc_netdev(sizeof(*t), name, NET_NAME_UNKNOWN,
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ip6_tnl_dev_setup);
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if (!dev)
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goto failed;
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dev_net_set(dev, net);
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t = netdev_priv(dev);
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t->parms = *p;
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t->net = dev_net(dev);
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err = ip6_tnl_create2(dev);
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if (err < 0)
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goto failed_free;
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return t;
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failed_free:
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free_netdev(dev);
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failed:
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return ERR_PTR(err);
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}
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/**
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* ip6_tnl_locate - find or create tunnel matching given parameters
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* @p: tunnel parameters
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* @create: != 0 if allowed to create new tunnel if no match found
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*
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* Description:
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* ip6_tnl_locate() first tries to locate an existing tunnel
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* based on @parms. If this is unsuccessful, but @create is set a new
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* tunnel device is created and registered for use.
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*
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* Return:
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* matching tunnel or error pointer
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**/
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static struct ip6_tnl *ip6_tnl_locate(struct net *net,
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struct __ip6_tnl_parm *p, int create)
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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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struct ip6_tnl __rcu **tp;
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struct ip6_tnl *t;
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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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for (tp = ip6_tnl_bucket(ip6n, p);
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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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if (create)
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return ERR_PTR(-EEXIST);
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return t;
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}
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}
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if (!create)
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return ERR_PTR(-ENODEV);
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return ip6_tnl_create(net, p);
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}
|
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|
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/**
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* ip6_tnl_dev_uninit - tunnel device uninitializer
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* @dev: the device to be destroyed
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*
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* Description:
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* ip6_tnl_dev_uninit() removes tunnel from its list
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**/
|
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static void
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ip6_tnl_dev_uninit(struct net_device *dev)
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{
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struct ip6_tnl *t = netdev_priv(dev);
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struct net *net = t->net;
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struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
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if (dev == ip6n->fb_tnl_dev)
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RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL);
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else
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ip6_tnl_unlink(ip6n, t);
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dst_cache_reset(&t->dst_cache);
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dev_put(dev);
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}
|
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|
|
/**
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* parse_tvl_tnl_enc_lim - handle encapsulation limit option
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* @skb: received socket buffer
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*
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* Return:
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* 0 if none was found,
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* else index to encapsulation limit
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**/
|
|
|
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__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw)
|
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{
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const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw;
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unsigned int nhoff = raw - skb->data;
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unsigned int off = nhoff + sizeof(*ipv6h);
|
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u8 next, nexthdr = ipv6h->nexthdr;
|
|
|
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while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) {
|
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struct ipv6_opt_hdr *hdr;
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u16 optlen;
|
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|
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if (!pskb_may_pull(skb, off + sizeof(*hdr)))
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break;
|
|
|
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hdr = (struct ipv6_opt_hdr *)(skb->data + off);
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if (nexthdr == NEXTHDR_FRAGMENT) {
|
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struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr;
|
|
if (frag_hdr->frag_off)
|
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break;
|
|
optlen = 8;
|
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} else if (nexthdr == NEXTHDR_AUTH) {
|
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optlen = (hdr->hdrlen + 2) << 2;
|
|
} else {
|
|
optlen = ipv6_optlen(hdr);
|
|
}
|
|
/* cache hdr->nexthdr, since pskb_may_pull() might
|
|
* invalidate hdr
|
|
*/
|
|
next = hdr->nexthdr;
|
|
if (nexthdr == NEXTHDR_DEST) {
|
|
u16 i = 2;
|
|
|
|
/* Remember : hdr is no longer valid at this point. */
|
|
if (!pskb_may_pull(skb, off + optlen))
|
|
break;
|
|
|
|
while (1) {
|
|
struct ipv6_tlv_tnl_enc_lim *tel;
|
|
|
|
/* No more room for encapsulation limit */
|
|
if (i + sizeof(*tel) > optlen)
|
|
break;
|
|
|
|
tel = (struct ipv6_tlv_tnl_enc_lim *)(skb->data + off + i);
|
|
/* return index of option if found and valid */
|
|
if (tel->type == IPV6_TLV_TNL_ENCAP_LIMIT &&
|
|
tel->length == 1)
|
|
return i + off - nhoff;
|
|
/* else jump to next option */
|
|
if (tel->type)
|
|
i += tel->length + 2;
|
|
else
|
|
i++;
|
|
}
|
|
}
|
|
nexthdr = next;
|
|
off += optlen;
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ip6_tnl_parse_tlv_enc_lim);
|
|
|
|
/**
|
|
* ip6_tnl_err - tunnel error handler
|
|
*
|
|
* Description:
|
|
* ip6_tnl_err() should handle errors in the tunnel according
|
|
* to the specifications in RFC 2473.
|
|
**/
|
|
|
|
static int
|
|
ip6_tnl_err(struct sk_buff *skb, __u8 ipproto, struct inet6_skb_parm *opt,
|
|
u8 *type, u8 *code, int *msg, __u32 *info, int offset)
|
|
{
|
|
const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)skb->data;
|
|
struct net *net = dev_net(skb->dev);
|
|
u8 rel_type = ICMPV6_DEST_UNREACH;
|
|
u8 rel_code = ICMPV6_ADDR_UNREACH;
|
|
__u32 rel_info = 0;
|
|
struct ip6_tnl *t;
|
|
int err = -ENOENT;
|
|
int rel_msg = 0;
|
|
u8 tproto;
|
|
__u16 len;
|
|
|
|
/* If the packet doesn't contain the original IPv6 header we are
|
|
in trouble since we might need the source address for further
|
|
processing of the error. */
|
|
|
|
rcu_read_lock();
|
|
t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->daddr, &ipv6h->saddr);
|
|
if (!t)
|
|
goto out;
|
|
|
|
tproto = READ_ONCE(t->parms.proto);
|
|
if (tproto != ipproto && tproto != 0)
|
|
goto out;
|
|
|
|
err = 0;
|
|
|
|
switch (*type) {
|
|
struct ipv6_tlv_tnl_enc_lim *tel;
|
|
__u32 mtu, teli;
|
|
case ICMPV6_DEST_UNREACH:
|
|
net_dbg_ratelimited("%s: Path to destination invalid or inactive!\n",
|
|
t->parms.name);
|
|
rel_msg = 1;
|
|
break;
|
|
case ICMPV6_TIME_EXCEED:
|
|
if ((*code) == ICMPV6_EXC_HOPLIMIT) {
|
|
net_dbg_ratelimited("%s: Too small hop limit or routing loop in tunnel!\n",
|
|
t->parms.name);
|
|
rel_msg = 1;
|
|
}
|
|
break;
|
|
case ICMPV6_PARAMPROB:
|
|
teli = 0;
|
|
if ((*code) == ICMPV6_HDR_FIELD)
|
|
teli = ip6_tnl_parse_tlv_enc_lim(skb, skb->data);
|
|
|
|
if (teli && teli == *info - 2) {
|
|
tel = (struct ipv6_tlv_tnl_enc_lim *) &skb->data[teli];
|
|
if (tel->encap_limit == 0) {
|
|
net_dbg_ratelimited("%s: Too small encapsulation limit or routing loop in tunnel!\n",
|
|
t->parms.name);
|
|
rel_msg = 1;
|
|
}
|
|
} else {
|
|
net_dbg_ratelimited("%s: Recipient unable to parse tunneled packet!\n",
|
|
t->parms.name);
|
|
}
|
|
break;
|
|
case ICMPV6_PKT_TOOBIG:
|
|
ip6_update_pmtu(skb, net, htonl(*info), 0, 0,
|
|
sock_net_uid(net, NULL));
|
|
mtu = *info - offset;
|
|
if (mtu < IPV6_MIN_MTU)
|
|
mtu = IPV6_MIN_MTU;
|
|
len = sizeof(*ipv6h) + ntohs(ipv6h->payload_len);
|
|
if (len > mtu) {
|
|
rel_type = ICMPV6_PKT_TOOBIG;
|
|
rel_code = 0;
|
|
rel_info = mtu;
|
|
rel_msg = 1;
|
|
}
|
|
break;
|
|
case NDISC_REDIRECT:
|
|
ip6_redirect(skb, net, skb->dev->ifindex, 0,
|
|
sock_net_uid(net, NULL));
|
|
break;
|
|
}
|
|
|
|
*type = rel_type;
|
|
*code = rel_code;
|
|
*info = rel_info;
|
|
*msg = rel_msg;
|
|
|
|
out:
|
|
rcu_read_unlock();
|
|
return err;
|
|
}
|
|
|
|
static int
|
|
ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
u8 type, u8 code, int offset, __be32 info)
|
|
{
|
|
__u32 rel_info = ntohl(info);
|
|
const struct iphdr *eiph;
|
|
struct sk_buff *skb2;
|
|
int err, rel_msg = 0;
|
|
u8 rel_type = type;
|
|
u8 rel_code = code;
|
|
struct rtable *rt;
|
|
struct flowi4 fl4;
|
|
|
|
err = ip6_tnl_err(skb, IPPROTO_IPIP, opt, &rel_type, &rel_code,
|
|
&rel_msg, &rel_info, offset);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (rel_msg == 0)
|
|
return 0;
|
|
|
|
switch (rel_type) {
|
|
case ICMPV6_DEST_UNREACH:
|
|
if (rel_code != ICMPV6_ADDR_UNREACH)
|
|
return 0;
|
|
rel_type = ICMP_DEST_UNREACH;
|
|
rel_code = ICMP_HOST_UNREACH;
|
|
break;
|
|
case ICMPV6_PKT_TOOBIG:
|
|
if (rel_code != 0)
|
|
return 0;
|
|
rel_type = ICMP_DEST_UNREACH;
|
|
rel_code = ICMP_FRAG_NEEDED;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
if (!pskb_may_pull(skb, offset + sizeof(struct iphdr)))
|
|
return 0;
|
|
|
|
skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
if (!skb2)
|
|
return 0;
|
|
|
|
skb_dst_drop(skb2);
|
|
|
|
skb_pull(skb2, offset);
|
|
skb_reset_network_header(skb2);
|
|
eiph = ip_hdr(skb2);
|
|
|
|
/* Try to guess incoming interface */
|
|
rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL, eiph->saddr,
|
|
0, 0, 0, IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
|
|
if (IS_ERR(rt))
|
|
goto out;
|
|
|
|
skb2->dev = rt->dst.dev;
|
|
ip_rt_put(rt);
|
|
|
|
/* route "incoming" packet */
|
|
if (rt->rt_flags & RTCF_LOCAL) {
|
|
rt = ip_route_output_ports(dev_net(skb->dev), &fl4, NULL,
|
|
eiph->daddr, eiph->saddr, 0, 0,
|
|
IPPROTO_IPIP, RT_TOS(eiph->tos), 0);
|
|
if (IS_ERR(rt) || rt->dst.dev->type != ARPHRD_TUNNEL) {
|
|
if (!IS_ERR(rt))
|
|
ip_rt_put(rt);
|
|
goto out;
|
|
}
|
|
skb_dst_set(skb2, &rt->dst);
|
|
} else {
|
|
if (ip_route_input(skb2, eiph->daddr, eiph->saddr, eiph->tos,
|
|
skb2->dev) ||
|
|
skb_dst(skb2)->dev->type != ARPHRD_TUNNEL)
|
|
goto out;
|
|
}
|
|
|
|
/* change mtu on this route */
|
|
if (rel_type == ICMP_DEST_UNREACH && rel_code == ICMP_FRAG_NEEDED) {
|
|
if (rel_info > dst_mtu(skb_dst(skb2)))
|
|
goto out;
|
|
|
|
skb_dst_update_pmtu(skb2, rel_info);
|
|
}
|
|
|
|
icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
|
|
|
|
out:
|
|
kfree_skb(skb2);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
ip6ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
|
|
u8 type, u8 code, int offset, __be32 info)
|
|
{
|
|
__u32 rel_info = ntohl(info);
|
|
int err, rel_msg = 0;
|
|
u8 rel_type = type;
|
|
u8 rel_code = code;
|
|
|
|
err = ip6_tnl_err(skb, IPPROTO_IPV6, opt, &rel_type, &rel_code,
|
|
&rel_msg, &rel_info, offset);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (rel_msg && pskb_may_pull(skb, offset + sizeof(struct ipv6hdr))) {
|
|
struct rt6_info *rt;
|
|
struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (!skb2)
|
|
return 0;
|
|
|
|
skb_dst_drop(skb2);
|
|
skb_pull(skb2, offset);
|
|
skb_reset_network_header(skb2);
|
|
|
|
/* Try to guess incoming interface */
|
|
rt = rt6_lookup(dev_net(skb->dev), &ipv6_hdr(skb2)->saddr,
|
|
NULL, 0, skb2, 0);
|
|
|
|
if (rt && rt->dst.dev)
|
|
skb2->dev = rt->dst.dev;
|
|
|
|
icmpv6_send(skb2, rel_type, rel_code, rel_info);
|
|
|
|
ip6_rt_put(rt);
|
|
|
|
kfree_skb(skb2);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ip4ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
|
|
const struct ipv6hdr *ipv6h,
|
|
struct sk_buff *skb)
|
|
{
|
|
__u8 dsfield = ipv6_get_dsfield(ipv6h) & ~INET_ECN_MASK;
|
|
|
|
if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
|
|
ipv4_change_dsfield(ip_hdr(skb), INET_ECN_MASK, dsfield);
|
|
|
|
return IP6_ECN_decapsulate(ipv6h, skb);
|
|
}
|
|
|
|
static int ip6ip6_dscp_ecn_decapsulate(const struct ip6_tnl *t,
|
|
const struct ipv6hdr *ipv6h,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (t->parms.flags & IP6_TNL_F_RCV_DSCP_COPY)
|
|
ipv6_copy_dscp(ipv6_get_dsfield(ipv6h), ipv6_hdr(skb));
|
|
|
|
return IP6_ECN_decapsulate(ipv6h, skb);
|
|
}
|
|
|
|
__u32 ip6_tnl_get_cap(struct ip6_tnl *t,
|
|
const struct in6_addr *laddr,
|
|
const struct in6_addr *raddr)
|
|
{
|
|
struct __ip6_tnl_parm *p = &t->parms;
|
|
int ltype = ipv6_addr_type(laddr);
|
|
int rtype = ipv6_addr_type(raddr);
|
|
__u32 flags = 0;
|
|
|
|
if (ltype == IPV6_ADDR_ANY || rtype == IPV6_ADDR_ANY) {
|
|
flags = IP6_TNL_F_CAP_PER_PACKET;
|
|
} else if (ltype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
|
|
rtype & (IPV6_ADDR_UNICAST|IPV6_ADDR_MULTICAST) &&
|
|
!((ltype|rtype) & IPV6_ADDR_LOOPBACK) &&
|
|
(!((ltype|rtype) & IPV6_ADDR_LINKLOCAL) || p->link)) {
|
|
if (ltype&IPV6_ADDR_UNICAST)
|
|
flags |= IP6_TNL_F_CAP_XMIT;
|
|
if (rtype&IPV6_ADDR_UNICAST)
|
|
flags |= IP6_TNL_F_CAP_RCV;
|
|
}
|
|
return flags;
|
|
}
|
|
EXPORT_SYMBOL(ip6_tnl_get_cap);
|
|
|
|
/* called with rcu_read_lock() */
|
|
int ip6_tnl_rcv_ctl(struct ip6_tnl *t,
|
|
const struct in6_addr *laddr,
|
|
const struct in6_addr *raddr)
|
|
{
|
|
struct __ip6_tnl_parm *p = &t->parms;
|
|
int ret = 0;
|
|
struct net *net = t->net;
|
|
|
|
if ((p->flags & IP6_TNL_F_CAP_RCV) ||
|
|
((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
|
|
(ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_RCV))) {
|
|
struct net_device *ldev = NULL;
|
|
|
|
if (p->link)
|
|
ldev = dev_get_by_index_rcu(net, p->link);
|
|
|
|
if ((ipv6_addr_is_multicast(laddr) ||
|
|
likely(ipv6_chk_addr_and_flags(net, laddr, ldev, false,
|
|
0, IFA_F_TENTATIVE))) &&
|
|
((p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) ||
|
|
likely(!ipv6_chk_addr_and_flags(net, raddr, ldev, true,
|
|
0, IFA_F_TENTATIVE))))
|
|
ret = 1;
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_tnl_rcv_ctl);
|
|
|
|
static int __ip6_tnl_rcv(struct ip6_tnl *tunnel, struct sk_buff *skb,
|
|
const struct tnl_ptk_info *tpi,
|
|
struct metadata_dst *tun_dst,
|
|
int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
|
|
const struct ipv6hdr *ipv6h,
|
|
struct sk_buff *skb),
|
|
bool log_ecn_err)
|
|
{
|
|
struct pcpu_sw_netstats *tstats;
|
|
const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
|
int err;
|
|
|
|
if ((!(tpi->flags & TUNNEL_CSUM) &&
|
|
(tunnel->parms.i_flags & TUNNEL_CSUM)) ||
|
|
((tpi->flags & TUNNEL_CSUM) &&
|
|
!(tunnel->parms.i_flags & TUNNEL_CSUM))) {
|
|
tunnel->dev->stats.rx_crc_errors++;
|
|
tunnel->dev->stats.rx_errors++;
|
|
goto drop;
|
|
}
|
|
|
|
if (tunnel->parms.i_flags & TUNNEL_SEQ) {
|
|
if (!(tpi->flags & TUNNEL_SEQ) ||
|
|
(tunnel->i_seqno &&
|
|
(s32)(ntohl(tpi->seq) - tunnel->i_seqno) < 0)) {
|
|
tunnel->dev->stats.rx_fifo_errors++;
|
|
tunnel->dev->stats.rx_errors++;
|
|
goto drop;
|
|
}
|
|
tunnel->i_seqno = ntohl(tpi->seq) + 1;
|
|
}
|
|
|
|
skb->protocol = tpi->proto;
|
|
|
|
/* 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);
|
|
} else {
|
|
skb->dev = tunnel->dev;
|
|
}
|
|
|
|
skb_reset_network_header(skb);
|
|
memset(skb->cb, 0, sizeof(struct inet6_skb_parm));
|
|
|
|
__skb_tunnel_rx(skb, tunnel->dev, tunnel->net);
|
|
|
|
err = dscp_ecn_decapsulate(tunnel, ipv6h, skb);
|
|
if (unlikely(err)) {
|
|
if (log_ecn_err)
|
|
net_info_ratelimited("non-ECT from %pI6 with DS=%#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);
|
|
|
|
skb_scrub_packet(skb, !net_eq(tunnel->net, dev_net(tunnel->dev)));
|
|
|
|
if (tun_dst)
|
|
skb_dst_set(skb, (struct dst_entry *)tun_dst);
|
|
|
|
gro_cells_receive(&tunnel->gro_cells, skb);
|
|
return 0;
|
|
|
|
drop:
|
|
if (tun_dst)
|
|
dst_release((struct dst_entry *)tun_dst);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
int ip6_tnl_rcv(struct ip6_tnl *t, struct sk_buff *skb,
|
|
const struct tnl_ptk_info *tpi,
|
|
struct metadata_dst *tun_dst,
|
|
bool log_ecn_err)
|
|
{
|
|
return __ip6_tnl_rcv(t, skb, tpi, tun_dst, ip6ip6_dscp_ecn_decapsulate,
|
|
log_ecn_err);
|
|
}
|
|
EXPORT_SYMBOL(ip6_tnl_rcv);
|
|
|
|
static const struct tnl_ptk_info tpi_v6 = {
|
|
/* no tunnel info required for ipxip6. */
|
|
.proto = htons(ETH_P_IPV6),
|
|
};
|
|
|
|
static const struct tnl_ptk_info tpi_v4 = {
|
|
/* no tunnel info required for ipxip6. */
|
|
.proto = htons(ETH_P_IP),
|
|
};
|
|
|
|
static int ipxip6_rcv(struct sk_buff *skb, u8 ipproto,
|
|
const struct tnl_ptk_info *tpi,
|
|
int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t,
|
|
const struct ipv6hdr *ipv6h,
|
|
struct sk_buff *skb))
|
|
{
|
|
struct ip6_tnl *t;
|
|
const struct ipv6hdr *ipv6h = ipv6_hdr(skb);
|
|
struct metadata_dst *tun_dst = NULL;
|
|
int ret = -1;
|
|
|
|
rcu_read_lock();
|
|
t = ip6_tnl_lookup(dev_net(skb->dev), &ipv6h->saddr, &ipv6h->daddr);
|
|
|
|
if (t) {
|
|
u8 tproto = READ_ONCE(t->parms.proto);
|
|
|
|
if (tproto != ipproto && tproto != 0)
|
|
goto drop;
|
|
if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto drop;
|
|
ipv6h = ipv6_hdr(skb);
|
|
if (!ip6_tnl_rcv_ctl(t, &ipv6h->daddr, &ipv6h->saddr))
|
|
goto drop;
|
|
if (iptunnel_pull_header(skb, 0, tpi->proto, false))
|
|
goto drop;
|
|
if (t->parms.collect_md) {
|
|
tun_dst = ipv6_tun_rx_dst(skb, 0, 0, 0);
|
|
if (!tun_dst)
|
|
goto drop;
|
|
}
|
|
ret = __ip6_tnl_rcv(t, skb, tpi, tun_dst, dscp_ecn_decapsulate,
|
|
log_ecn_error);
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
|
|
return ret;
|
|
|
|
drop:
|
|
rcu_read_unlock();
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static int ip4ip6_rcv(struct sk_buff *skb)
|
|
{
|
|
return ipxip6_rcv(skb, IPPROTO_IPIP, &tpi_v4,
|
|
ip4ip6_dscp_ecn_decapsulate);
|
|
}
|
|
|
|
static int ip6ip6_rcv(struct sk_buff *skb)
|
|
{
|
|
return ipxip6_rcv(skb, IPPROTO_IPV6, &tpi_v6,
|
|
ip6ip6_dscp_ecn_decapsulate);
|
|
}
|
|
|
|
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.dst1opt = (struct ipv6_opt_hdr *) opt->dst_opt;
|
|
opt->ops.opt_nflen = 8;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
ip6_tnl_addr_conflict(const struct ip6_tnl *t, const struct ipv6hdr *hdr)
|
|
{
|
|
return ipv6_addr_equal(&t->parms.raddr, &hdr->saddr);
|
|
}
|
|
|
|
int ip6_tnl_xmit_ctl(struct ip6_tnl *t,
|
|
const struct in6_addr *laddr,
|
|
const struct in6_addr *raddr)
|
|
{
|
|
struct __ip6_tnl_parm *p = &t->parms;
|
|
int ret = 0;
|
|
struct net *net = t->net;
|
|
|
|
if (t->parms.collect_md)
|
|
return 1;
|
|
|
|
if ((p->flags & IP6_TNL_F_CAP_XMIT) ||
|
|
((p->flags & IP6_TNL_F_CAP_PER_PACKET) &&
|
|
(ip6_tnl_get_cap(t, laddr, raddr) & IP6_TNL_F_CAP_XMIT))) {
|
|
struct net_device *ldev = NULL;
|
|
|
|
rcu_read_lock();
|
|
if (p->link)
|
|
ldev = dev_get_by_index_rcu(net, p->link);
|
|
|
|
if (unlikely(!ipv6_chk_addr_and_flags(net, laddr, ldev, false,
|
|
0, IFA_F_TENTATIVE)))
|
|
pr_warn("%s xmit: Local address not yet configured!\n",
|
|
p->name);
|
|
else if (!(p->flags & IP6_TNL_F_ALLOW_LOCAL_REMOTE) &&
|
|
!ipv6_addr_is_multicast(raddr) &&
|
|
unlikely(ipv6_chk_addr_and_flags(net, raddr, ldev,
|
|
true, 0, IFA_F_TENTATIVE)))
|
|
pr_warn("%s xmit: Routing loop! Remote address found on this node!\n",
|
|
p->name);
|
|
else
|
|
ret = 1;
|
|
rcu_read_unlock();
|
|
}
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_tnl_xmit_ctl);
|
|
|
|
/**
|
|
* ip6_tnl_xmit - encapsulate packet and send
|
|
* @skb: the outgoing socket buffer
|
|
* @dev: the outgoing tunnel device
|
|
* @dsfield: dscp code for outer header
|
|
* @fl6: flow of tunneled packet
|
|
* @encap_limit: encapsulation limit
|
|
* @pmtu: Path MTU is stored if packet is too big
|
|
* @proto: next header value
|
|
*
|
|
* Description:
|
|
* Build new header and do some sanity checks on the packet before sending
|
|
* it.
|
|
*
|
|
* Return:
|
|
* 0 on success
|
|
* -1 fail
|
|
* %-EMSGSIZE message too big. return mtu in this case.
|
|
**/
|
|
|
|
int ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, __u8 dsfield,
|
|
struct flowi6 *fl6, int encap_limit, __u32 *pmtu,
|
|
__u8 proto)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct net *net = t->net;
|
|
struct net_device_stats *stats = &t->dev->stats;
|
|
struct ipv6hdr *ipv6h;
|
|
struct ipv6_tel_txoption opt;
|
|
struct dst_entry *dst = NULL, *ndst = NULL;
|
|
struct net_device *tdev;
|
|
int mtu;
|
|
unsigned int eth_hlen = t->dev->type == ARPHRD_ETHER ? ETH_HLEN : 0;
|
|
unsigned int psh_hlen = sizeof(struct ipv6hdr) + t->encap_hlen;
|
|
unsigned int max_headroom = psh_hlen;
|
|
bool use_cache = false;
|
|
u8 hop_limit;
|
|
int err = -1;
|
|
|
|
if (t->parms.collect_md) {
|
|
hop_limit = skb_tunnel_info(skb)->key.ttl;
|
|
goto route_lookup;
|
|
} else {
|
|
hop_limit = t->parms.hop_limit;
|
|
}
|
|
|
|
/* NBMA tunnel */
|
|
if (ipv6_addr_any(&t->parms.raddr)) {
|
|
if (skb->protocol == htons(ETH_P_IPV6)) {
|
|
struct in6_addr *addr6;
|
|
struct neighbour *neigh;
|
|
int addr_type;
|
|
|
|
if (!skb_dst(skb))
|
|
goto tx_err_link_failure;
|
|
|
|
neigh = dst_neigh_lookup(skb_dst(skb),
|
|
&ipv6_hdr(skb)->daddr);
|
|
if (!neigh)
|
|
goto tx_err_link_failure;
|
|
|
|
addr6 = (struct in6_addr *)&neigh->primary_key;
|
|
addr_type = ipv6_addr_type(addr6);
|
|
|
|
if (addr_type == IPV6_ADDR_ANY)
|
|
addr6 = &ipv6_hdr(skb)->daddr;
|
|
|
|
memcpy(&fl6->daddr, addr6, sizeof(fl6->daddr));
|
|
neigh_release(neigh);
|
|
}
|
|
} else if (t->parms.proto != 0 && !(t->parms.flags &
|
|
(IP6_TNL_F_USE_ORIG_TCLASS |
|
|
IP6_TNL_F_USE_ORIG_FWMARK))) {
|
|
/* enable the cache only if neither the outer protocol nor the
|
|
* routing decision depends on the current inner header value
|
|
*/
|
|
use_cache = true;
|
|
}
|
|
|
|
if (use_cache)
|
|
dst = dst_cache_get(&t->dst_cache);
|
|
|
|
if (!ip6_tnl_xmit_ctl(t, &fl6->saddr, &fl6->daddr))
|
|
goto tx_err_link_failure;
|
|
|
|
if (!dst) {
|
|
route_lookup:
|
|
/* add dsfield to flowlabel for route lookup */
|
|
fl6->flowlabel = ip6_make_flowinfo(dsfield, fl6->flowlabel);
|
|
|
|
dst = ip6_route_output(net, NULL, fl6);
|
|
|
|
if (dst->error)
|
|
goto tx_err_link_failure;
|
|
dst = xfrm_lookup(net, dst, flowi6_to_flowi(fl6), NULL, 0);
|
|
if (IS_ERR(dst)) {
|
|
err = PTR_ERR(dst);
|
|
dst = NULL;
|
|
goto tx_err_link_failure;
|
|
}
|
|
if (t->parms.collect_md && ipv6_addr_any(&fl6->saddr) &&
|
|
ipv6_dev_get_saddr(net, ip6_dst_idev(dst)->dev,
|
|
&fl6->daddr, 0, &fl6->saddr))
|
|
goto tx_err_link_failure;
|
|
ndst = dst;
|
|
}
|
|
|
|
tdev = dst->dev;
|
|
|
|
if (tdev == dev) {
|
|
stats->collisions++;
|
|
net_warn_ratelimited("%s: Local routing loop detected!\n",
|
|
t->parms.name);
|
|
goto tx_err_dst_release;
|
|
}
|
|
mtu = dst_mtu(dst) - eth_hlen - psh_hlen - t->tun_hlen;
|
|
if (encap_limit >= 0) {
|
|
max_headroom += 8;
|
|
mtu -= 8;
|
|
}
|
|
mtu = max(mtu, skb->protocol == htons(ETH_P_IPV6) ?
|
|
IPV6_MIN_MTU : IPV4_MIN_MTU);
|
|
|
|
skb_dst_update_pmtu(skb, mtu);
|
|
if (skb->len - t->tun_hlen - eth_hlen > mtu && !skb_is_gso(skb)) {
|
|
*pmtu = mtu;
|
|
err = -EMSGSIZE;
|
|
goto tx_err_dst_release;
|
|
}
|
|
|
|
if (t->err_count > 0) {
|
|
if (time_before(jiffies,
|
|
t->err_time + IP6TUNNEL_ERR_TIMEO)) {
|
|
t->err_count--;
|
|
|
|
dst_link_failure(skb);
|
|
} else {
|
|
t->err_count = 0;
|
|
}
|
|
}
|
|
|
|
skb_scrub_packet(skb, !net_eq(t->net, dev_net(dev)));
|
|
|
|
/*
|
|
* Okay, now see if we can stuff it in the buffer as-is.
|
|
*/
|
|
max_headroom += LL_RESERVED_SPACE(tdev);
|
|
|
|
if (skb_headroom(skb) < max_headroom || skb_shared(skb) ||
|
|
(skb_cloned(skb) && !skb_clone_writable(skb, 0))) {
|
|
struct sk_buff *new_skb;
|
|
|
|
new_skb = skb_realloc_headroom(skb, 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 (t->parms.collect_md) {
|
|
if (t->encap.type != TUNNEL_ENCAP_NONE)
|
|
goto tx_err_dst_release;
|
|
} else {
|
|
if (use_cache && ndst)
|
|
dst_cache_set_ip6(&t->dst_cache, ndst, &fl6->saddr);
|
|
}
|
|
skb_dst_set(skb, dst);
|
|
|
|
if (hop_limit == 0) {
|
|
if (skb->protocol == htons(ETH_P_IP))
|
|
hop_limit = ip_hdr(skb)->ttl;
|
|
else if (skb->protocol == htons(ETH_P_IPV6))
|
|
hop_limit = ipv6_hdr(skb)->hop_limit;
|
|
else
|
|
hop_limit = ip6_dst_hoplimit(dst);
|
|
}
|
|
|
|
/* Calculate max headroom for all the headers and adjust
|
|
* needed_headroom if necessary.
|
|
*/
|
|
max_headroom = LL_RESERVED_SPACE(dst->dev) + sizeof(struct ipv6hdr)
|
|
+ dst->header_len + t->hlen;
|
|
if (max_headroom > dev->needed_headroom)
|
|
dev->needed_headroom = max_headroom;
|
|
|
|
err = ip6_tnl_encap(skb, t, &proto, fl6);
|
|
if (err)
|
|
return err;
|
|
|
|
if (encap_limit >= 0) {
|
|
init_tel_txopt(&opt, encap_limit);
|
|
ipv6_push_frag_opts(skb, &opt.ops, &proto);
|
|
}
|
|
|
|
skb_push(skb, sizeof(struct ipv6hdr));
|
|
skb_reset_network_header(skb);
|
|
ipv6h = ipv6_hdr(skb);
|
|
ip6_flow_hdr(ipv6h, dsfield,
|
|
ip6_make_flowlabel(net, skb, fl6->flowlabel, true, fl6));
|
|
ipv6h->hop_limit = hop_limit;
|
|
ipv6h->nexthdr = proto;
|
|
ipv6h->saddr = fl6->saddr;
|
|
ipv6h->daddr = fl6->daddr;
|
|
ip6tunnel_xmit(NULL, skb, dev);
|
|
return 0;
|
|
tx_err_link_failure:
|
|
stats->tx_carrier_errors++;
|
|
dst_link_failure(skb);
|
|
tx_err_dst_release:
|
|
dst_release(dst);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(ip6_tnl_xmit);
|
|
|
|
static inline int
|
|
ip4ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
const struct iphdr *iph;
|
|
int encap_limit = -1;
|
|
struct flowi6 fl6;
|
|
__u8 dsfield;
|
|
__u32 mtu;
|
|
u8 tproto;
|
|
int err;
|
|
|
|
iph = ip_hdr(skb);
|
|
memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
|
|
|
|
tproto = READ_ONCE(t->parms.proto);
|
|
if (tproto != IPPROTO_IPIP && tproto != 0)
|
|
return -1;
|
|
|
|
if (t->parms.collect_md) {
|
|
struct ip_tunnel_info *tun_info;
|
|
const struct ip_tunnel_key *key;
|
|
|
|
tun_info = skb_tunnel_info(skb);
|
|
if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
|
|
ip_tunnel_info_af(tun_info) != AF_INET6))
|
|
return -1;
|
|
key = &tun_info->key;
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
fl6.flowi6_proto = IPPROTO_IPIP;
|
|
fl6.saddr = key->u.ipv6.src;
|
|
fl6.daddr = key->u.ipv6.dst;
|
|
fl6.flowlabel = key->label;
|
|
dsfield = key->tos;
|
|
} 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_IPIP;
|
|
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
|
|
dsfield = ipv4_get_dsfield(iph);
|
|
else
|
|
dsfield = ip6_tclass(t->parms.flowinfo);
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK)
|
|
fl6.flowi6_mark = skb->mark;
|
|
else
|
|
fl6.flowi6_mark = t->parms.fwmark;
|
|
}
|
|
|
|
fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
|
|
|
|
if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
|
|
return -1;
|
|
|
|
dsfield = INET_ECN_encapsulate(dsfield, ipv4_get_dsfield(iph));
|
|
|
|
skb_set_inner_ipproto(skb, IPPROTO_IPIP);
|
|
|
|
err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
|
|
IPPROTO_IPIP);
|
|
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
|
|
ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct ipv6hdr *ipv6h;
|
|
int encap_limit = -1;
|
|
__u16 offset;
|
|
struct flowi6 fl6;
|
|
__u8 dsfield;
|
|
__u32 mtu;
|
|
u8 tproto;
|
|
int err;
|
|
|
|
ipv6h = ipv6_hdr(skb);
|
|
tproto = READ_ONCE(t->parms.proto);
|
|
if ((tproto != IPPROTO_IPV6 && tproto != 0) ||
|
|
ip6_tnl_addr_conflict(t, ipv6h))
|
|
return -1;
|
|
|
|
if (t->parms.collect_md) {
|
|
struct ip_tunnel_info *tun_info;
|
|
const struct ip_tunnel_key *key;
|
|
|
|
tun_info = skb_tunnel_info(skb);
|
|
if (unlikely(!tun_info || !(tun_info->mode & IP_TUNNEL_INFO_TX) ||
|
|
ip_tunnel_info_af(tun_info) != AF_INET6))
|
|
return -1;
|
|
key = &tun_info->key;
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
fl6.flowi6_proto = IPPROTO_IPV6;
|
|
fl6.saddr = key->u.ipv6.src;
|
|
fl6.daddr = key->u.ipv6.dst;
|
|
fl6.flowlabel = key->label;
|
|
dsfield = key->tos;
|
|
} else {
|
|
offset = ip6_tnl_parse_tlv_enc_lim(skb, skb_network_header(skb));
|
|
/* ip6_tnl_parse_tlv_enc_lim() might have reallocated skb->head */
|
|
ipv6h = ipv6_hdr(skb);
|
|
if (offset > 0) {
|
|
struct ipv6_tlv_tnl_enc_lim *tel;
|
|
|
|
tel = (void *)&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;
|
|
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS)
|
|
dsfield = ipv6_get_dsfield(ipv6h);
|
|
else
|
|
dsfield = ip6_tclass(t->parms.flowinfo);
|
|
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;
|
|
else
|
|
fl6.flowi6_mark = t->parms.fwmark;
|
|
}
|
|
|
|
fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL);
|
|
|
|
if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6))
|
|
return -1;
|
|
|
|
dsfield = INET_ECN_encapsulate(dsfield, ipv6_get_dsfield(ipv6h));
|
|
|
|
skb_set_inner_ipproto(skb, IPPROTO_IPV6);
|
|
|
|
err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu,
|
|
IPPROTO_IPV6);
|
|
if (err != 0) {
|
|
if (err == -EMSGSIZE)
|
|
icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static netdev_tx_t
|
|
ip6_tnl_start_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 (!pskb_inet_may_pull(skb))
|
|
goto tx_err;
|
|
|
|
switch (skb->protocol) {
|
|
case htons(ETH_P_IP):
|
|
ret = ip4ip6_tnl_xmit(skb, dev);
|
|
break;
|
|
case htons(ETH_P_IPV6):
|
|
ret = ip6ip6_tnl_xmit(skb, dev);
|
|
break;
|
|
default:
|
|
goto tx_err;
|
|
}
|
|
|
|
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 ip6_tnl_link_config(struct ip6_tnl *t)
|
|
{
|
|
struct net_device *dev = t->dev;
|
|
struct __ip6_tnl_parm *p = &t->parms;
|
|
struct flowi6 *fl6 = &t->fl.u.ip6;
|
|
int t_hlen;
|
|
|
|
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->flags |= IFF_POINTOPOINT;
|
|
else
|
|
dev->flags &= ~IFF_POINTOPOINT;
|
|
|
|
t->tun_hlen = 0;
|
|
t->hlen = t->encap_hlen + t->tun_hlen;
|
|
t_hlen = t->hlen + sizeof(struct ipv6hdr);
|
|
|
|
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(t->net,
|
|
&p->raddr, &p->laddr,
|
|
p->link, NULL, strict);
|
|
|
|
if (!rt)
|
|
return;
|
|
|
|
if (rt->dst.dev) {
|
|
dev->hard_header_len = rt->dst.dev->hard_header_len +
|
|
t_hlen;
|
|
|
|
dev->mtu = rt->dst.dev->mtu - t_hlen;
|
|
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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_change - update the tunnel parameters
|
|
* @t: tunnel to be changed
|
|
* @p: tunnel configuration parameters
|
|
*
|
|
* Description:
|
|
* ip6_tnl_change() updates the tunnel parameters
|
|
**/
|
|
|
|
static int
|
|
ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p)
|
|
{
|
|
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.fwmark = p->fwmark;
|
|
dst_cache_reset(&t->dst_cache);
|
|
ip6_tnl_link_config(t);
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
|
|
{
|
|
struct net *net = t->net;
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
int err;
|
|
|
|
ip6_tnl_unlink(ip6n, t);
|
|
synchronize_net();
|
|
err = ip6_tnl_change(t, p);
|
|
ip6_tnl_link(ip6n, t);
|
|
netdev_state_change(t->dev);
|
|
return err;
|
|
}
|
|
|
|
static int ip6_tnl0_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)
|
|
{
|
|
/* for default tnl0 device allow to change only the proto */
|
|
t->parms.proto = p->proto;
|
|
netdev_state_change(t->dev);
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *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->proto = u->proto;
|
|
memcpy(p->name, u->name, sizeof(u->name));
|
|
}
|
|
|
|
static void
|
|
ip6_tnl_parm_to_user(struct ip6_tnl_parm *u, const struct __ip6_tnl_parm *p)
|
|
{
|
|
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->proto = p->proto;
|
|
memcpy(u->name, p->name, sizeof(u->name));
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_ioctl - configure ipv6 tunnels from userspace
|
|
* @dev: virtual device associated with tunnel
|
|
* @ifr: parameters passed from userspace
|
|
* @cmd: command to be performed
|
|
*
|
|
* Description:
|
|
* ip6_tnl_ioctl() is used for managing IPv6 tunnels
|
|
* from userspace.
|
|
*
|
|
* The possible commands are the following:
|
|
* %SIOCGETTUNNEL: get tunnel parameters for device
|
|
* %SIOCADDTUNNEL: add tunnel matching given tunnel parameters
|
|
* %SIOCCHGTUNNEL: change tunnel parameters to those given
|
|
* %SIOCDELTUNNEL: delete tunnel
|
|
*
|
|
* The fallback device "ip6tnl0", created during module
|
|
* initialization, can be used for creating other tunnel devices.
|
|
*
|
|
* Return:
|
|
* 0 on success,
|
|
* %-EFAULT if unable to copy data to or from userspace,
|
|
* %-EPERM if current process hasn't %CAP_NET_ADMIN set
|
|
* %-EINVAL if passed tunnel parameters are invalid,
|
|
* %-EEXIST if changing a tunnel's parameters would cause a conflict
|
|
* %-ENODEV if attempting to change or delete a nonexisting device
|
|
**/
|
|
|
|
static int
|
|
ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
|
|
{
|
|
int err = 0;
|
|
struct ip6_tnl_parm p;
|
|
struct __ip6_tnl_parm p1;
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct net *net = t->net;
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
|
|
memset(&p1, 0, sizeof(p1));
|
|
|
|
switch (cmd) {
|
|
case SIOCGETTUNNEL:
|
|
if (dev == ip6n->fb_tnl_dev) {
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
|
|
err = -EFAULT;
|
|
break;
|
|
}
|
|
ip6_tnl_parm_from_user(&p1, &p);
|
|
t = ip6_tnl_locate(net, &p1, 0);
|
|
if (IS_ERR(t))
|
|
t = netdev_priv(dev);
|
|
} else {
|
|
memset(&p, 0, sizeof(p));
|
|
}
|
|
ip6_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))
|
|
break;
|
|
err = -EFAULT;
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
|
break;
|
|
err = -EINVAL;
|
|
if (p.proto != IPPROTO_IPV6 && p.proto != IPPROTO_IPIP &&
|
|
p.proto != 0)
|
|
break;
|
|
ip6_tnl_parm_from_user(&p1, &p);
|
|
t = ip6_tnl_locate(net, &p1, cmd == SIOCADDTUNNEL);
|
|
if (cmd == SIOCCHGTUNNEL) {
|
|
if (!IS_ERR(t)) {
|
|
if (t->dev != dev) {
|
|
err = -EEXIST;
|
|
break;
|
|
}
|
|
} else
|
|
t = netdev_priv(dev);
|
|
if (dev == ip6n->fb_tnl_dev)
|
|
err = ip6_tnl0_update(t, &p1);
|
|
else
|
|
err = ip6_tnl_update(t, &p1);
|
|
}
|
|
if (!IS_ERR(t)) {
|
|
err = 0;
|
|
ip6_tnl_parm_to_user(&p, &t->parms);
|
|
if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
|
|
err = -EFAULT;
|
|
|
|
} else {
|
|
err = PTR_ERR(t);
|
|
}
|
|
break;
|
|
case SIOCDELTUNNEL:
|
|
err = -EPERM;
|
|
if (!ns_capable(net->user_ns, CAP_NET_ADMIN))
|
|
break;
|
|
|
|
if (dev == ip6n->fb_tnl_dev) {
|
|
err = -EFAULT;
|
|
if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
|
|
break;
|
|
err = -ENOENT;
|
|
ip6_tnl_parm_from_user(&p1, &p);
|
|
t = ip6_tnl_locate(net, &p1, 0);
|
|
if (IS_ERR(t))
|
|
break;
|
|
err = -EPERM;
|
|
if (t->dev == ip6n->fb_tnl_dev)
|
|
break;
|
|
dev = t->dev;
|
|
}
|
|
err = 0;
|
|
unregister_netdevice(dev);
|
|
break;
|
|
default:
|
|
err = -EINVAL;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_change_mtu - change mtu manually for tunnel device
|
|
* @dev: virtual device associated with tunnel
|
|
* @new_mtu: the new mtu
|
|
*
|
|
* Return:
|
|
* 0 on success,
|
|
* %-EINVAL if mtu too small
|
|
**/
|
|
|
|
int ip6_tnl_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
struct ip6_tnl *tnl = netdev_priv(dev);
|
|
|
|
if (tnl->parms.proto == IPPROTO_IPV6) {
|
|
if (new_mtu < IPV6_MIN_MTU)
|
|
return -EINVAL;
|
|
} else {
|
|
if (new_mtu < ETH_MIN_MTU)
|
|
return -EINVAL;
|
|
}
|
|
if (tnl->parms.proto == IPPROTO_IPV6 || tnl->parms.proto == 0) {
|
|
if (new_mtu > IP6_MAX_MTU - dev->hard_header_len)
|
|
return -EINVAL;
|
|
} else {
|
|
if (new_mtu > IP_MAX_MTU - dev->hard_header_len)
|
|
return -EINVAL;
|
|
}
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ip6_tnl_change_mtu);
|
|
|
|
int ip6_tnl_get_iflink(const struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
|
|
return t->parms.link;
|
|
}
|
|
EXPORT_SYMBOL(ip6_tnl_get_iflink);
|
|
|
|
int ip6_tnl_encap_add_ops(const struct ip6_tnl_encap_ops *ops,
|
|
unsigned int num)
|
|
{
|
|
if (num >= MAX_IPTUN_ENCAP_OPS)
|
|
return -ERANGE;
|
|
|
|
return !cmpxchg((const struct ip6_tnl_encap_ops **)
|
|
&ip6tun_encaps[num],
|
|
NULL, ops) ? 0 : -1;
|
|
}
|
|
EXPORT_SYMBOL(ip6_tnl_encap_add_ops);
|
|
|
|
int ip6_tnl_encap_del_ops(const struct ip6_tnl_encap_ops *ops,
|
|
unsigned int num)
|
|
{
|
|
int ret;
|
|
|
|
if (num >= MAX_IPTUN_ENCAP_OPS)
|
|
return -ERANGE;
|
|
|
|
ret = (cmpxchg((const struct ip6_tnl_encap_ops **)
|
|
&ip6tun_encaps[num],
|
|
ops, NULL) == ops) ? 0 : -1;
|
|
|
|
synchronize_net();
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL(ip6_tnl_encap_del_ops);
|
|
|
|
int ip6_tnl_encap_setup(struct ip6_tnl *t,
|
|
struct ip_tunnel_encap *ipencap)
|
|
{
|
|
int hlen;
|
|
|
|
memset(&t->encap, 0, sizeof(t->encap));
|
|
|
|
hlen = ip6_encap_hlen(ipencap);
|
|
if (hlen < 0)
|
|
return hlen;
|
|
|
|
t->encap.type = ipencap->type;
|
|
t->encap.sport = ipencap->sport;
|
|
t->encap.dport = ipencap->dport;
|
|
t->encap.flags = ipencap->flags;
|
|
|
|
t->encap_hlen = hlen;
|
|
t->hlen = t->encap_hlen + t->tun_hlen;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ip6_tnl_encap_setup);
|
|
|
|
static const struct net_device_ops ip6_tnl_netdev_ops = {
|
|
.ndo_init = ip6_tnl_dev_init,
|
|
.ndo_uninit = ip6_tnl_dev_uninit,
|
|
.ndo_start_xmit = ip6_tnl_start_xmit,
|
|
.ndo_do_ioctl = ip6_tnl_ioctl,
|
|
.ndo_change_mtu = ip6_tnl_change_mtu,
|
|
.ndo_get_stats = ip6_get_stats,
|
|
.ndo_get_iflink = ip6_tnl_get_iflink,
|
|
};
|
|
|
|
#define IPXIPX_FEATURES (NETIF_F_SG | \
|
|
NETIF_F_FRAGLIST | \
|
|
NETIF_F_HIGHDMA | \
|
|
NETIF_F_GSO_SOFTWARE | \
|
|
NETIF_F_HW_CSUM)
|
|
|
|
/**
|
|
* ip6_tnl_dev_setup - setup virtual tunnel device
|
|
* @dev: virtual device associated with tunnel
|
|
*
|
|
* Description:
|
|
* Initialize function pointers and device parameters
|
|
**/
|
|
|
|
static void ip6_tnl_dev_setup(struct net_device *dev)
|
|
{
|
|
dev->netdev_ops = &ip6_tnl_netdev_ops;
|
|
dev->needs_free_netdev = true;
|
|
dev->priv_destructor = ip6_dev_free;
|
|
|
|
dev->type = ARPHRD_TUNNEL6;
|
|
dev->flags |= IFF_NOARP;
|
|
dev->addr_len = sizeof(struct in6_addr);
|
|
dev->features |= NETIF_F_LLTX;
|
|
netif_keep_dst(dev);
|
|
|
|
dev->features |= IPXIPX_FEATURES;
|
|
dev->hw_features |= IPXIPX_FEATURES;
|
|
|
|
/* This perm addr will be used as interface identifier by IPv6 */
|
|
dev->addr_assign_type = NET_ADDR_RANDOM;
|
|
eth_random_addr(dev->perm_addr);
|
|
}
|
|
|
|
|
|
/**
|
|
* ip6_tnl_dev_init_gen - general initializer for all tunnel devices
|
|
* @dev: virtual device associated with tunnel
|
|
**/
|
|
|
|
static inline int
|
|
ip6_tnl_dev_init_gen(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
int ret;
|
|
int t_hlen;
|
|
|
|
t->dev = dev;
|
|
t->net = dev_net(dev);
|
|
dev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
|
|
if (!dev->tstats)
|
|
return -ENOMEM;
|
|
|
|
ret = dst_cache_init(&t->dst_cache, GFP_KERNEL);
|
|
if (ret)
|
|
goto free_stats;
|
|
|
|
ret = gro_cells_init(&t->gro_cells, dev);
|
|
if (ret)
|
|
goto destroy_dst;
|
|
|
|
t->tun_hlen = 0;
|
|
t->hlen = t->encap_hlen + t->tun_hlen;
|
|
t_hlen = t->hlen + sizeof(struct ipv6hdr);
|
|
|
|
dev->type = ARPHRD_TUNNEL6;
|
|
dev->hard_header_len = LL_MAX_HEADER + t_hlen;
|
|
dev->mtu = ETH_DATA_LEN - t_hlen;
|
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
|
|
dev->mtu -= 8;
|
|
dev->min_mtu = ETH_MIN_MTU;
|
|
dev->max_mtu = IP6_MAX_MTU - dev->hard_header_len;
|
|
|
|
return 0;
|
|
|
|
destroy_dst:
|
|
dst_cache_destroy(&t->dst_cache);
|
|
free_stats:
|
|
free_percpu(dev->tstats);
|
|
dev->tstats = NULL;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* ip6_tnl_dev_init - initializer for all non fallback tunnel devices
|
|
* @dev: virtual device associated with tunnel
|
|
**/
|
|
|
|
static int ip6_tnl_dev_init(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
int err = ip6_tnl_dev_init_gen(dev);
|
|
|
|
if (err)
|
|
return err;
|
|
ip6_tnl_link_config(t);
|
|
if (t->parms.collect_md) {
|
|
dev->features |= NETIF_F_NETNS_LOCAL;
|
|
netif_keep_dst(dev);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* ip6_fb_tnl_dev_init - initializer for fallback tunnel device
|
|
* @dev: fallback device
|
|
*
|
|
* Return: 0
|
|
**/
|
|
|
|
static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct net *net = dev_net(dev);
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
|
|
t->parms.proto = IPPROTO_IPV6;
|
|
dev_hold(dev);
|
|
|
|
rcu_assign_pointer(ip6n->tnls_wc[0], t);
|
|
return 0;
|
|
}
|
|
|
|
static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
u8 proto;
|
|
|
|
if (!data || !data[IFLA_IPTUN_PROTO])
|
|
return 0;
|
|
|
|
proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
|
|
if (proto != IPPROTO_IPV6 &&
|
|
proto != IPPROTO_IPIP &&
|
|
proto != 0)
|
|
return -EINVAL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void ip6_tnl_netlink_parms(struct nlattr *data[],
|
|
struct __ip6_tnl_parm *parms)
|
|
{
|
|
memset(parms, 0, sizeof(*parms));
|
|
|
|
if (!data)
|
|
return;
|
|
|
|
if (data[IFLA_IPTUN_LINK])
|
|
parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);
|
|
|
|
if (data[IFLA_IPTUN_LOCAL])
|
|
parms->laddr = nla_get_in6_addr(data[IFLA_IPTUN_LOCAL]);
|
|
|
|
if (data[IFLA_IPTUN_REMOTE])
|
|
parms->raddr = nla_get_in6_addr(data[IFLA_IPTUN_REMOTE]);
|
|
|
|
if (data[IFLA_IPTUN_TTL])
|
|
parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);
|
|
|
|
if (data[IFLA_IPTUN_ENCAP_LIMIT])
|
|
parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);
|
|
|
|
if (data[IFLA_IPTUN_FLOWINFO])
|
|
parms->flowinfo = nla_get_be32(data[IFLA_IPTUN_FLOWINFO]);
|
|
|
|
if (data[IFLA_IPTUN_FLAGS])
|
|
parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);
|
|
|
|
if (data[IFLA_IPTUN_PROTO])
|
|
parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);
|
|
|
|
if (data[IFLA_IPTUN_COLLECT_METADATA])
|
|
parms->collect_md = true;
|
|
|
|
if (data[IFLA_IPTUN_FWMARK])
|
|
parms->fwmark = nla_get_u32(data[IFLA_IPTUN_FWMARK]);
|
|
}
|
|
|
|
static bool ip6_tnl_netlink_encap_parms(struct nlattr *data[],
|
|
struct ip_tunnel_encap *ipencap)
|
|
{
|
|
bool ret = false;
|
|
|
|
memset(ipencap, 0, sizeof(*ipencap));
|
|
|
|
if (!data)
|
|
return ret;
|
|
|
|
if (data[IFLA_IPTUN_ENCAP_TYPE]) {
|
|
ret = true;
|
|
ipencap->type = nla_get_u16(data[IFLA_IPTUN_ENCAP_TYPE]);
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_ENCAP_FLAGS]) {
|
|
ret = true;
|
|
ipencap->flags = nla_get_u16(data[IFLA_IPTUN_ENCAP_FLAGS]);
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_ENCAP_SPORT]) {
|
|
ret = true;
|
|
ipencap->sport = nla_get_be16(data[IFLA_IPTUN_ENCAP_SPORT]);
|
|
}
|
|
|
|
if (data[IFLA_IPTUN_ENCAP_DPORT]) {
|
|
ret = true;
|
|
ipencap->dport = nla_get_be16(data[IFLA_IPTUN_ENCAP_DPORT]);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,
|
|
struct nlattr *tb[], struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
struct ip_tunnel_encap ipencap;
|
|
struct ip6_tnl *nt, *t;
|
|
int err;
|
|
|
|
nt = netdev_priv(dev);
|
|
|
|
if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
|
|
err = ip6_tnl_encap_setup(nt, &ipencap);
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
|
|
ip6_tnl_netlink_parms(data, &nt->parms);
|
|
|
|
if (nt->parms.collect_md) {
|
|
if (rtnl_dereference(ip6n->collect_md_tun))
|
|
return -EEXIST;
|
|
} else {
|
|
t = ip6_tnl_locate(net, &nt->parms, 0);
|
|
if (!IS_ERR(t))
|
|
return -EEXIST;
|
|
}
|
|
|
|
err = ip6_tnl_create2(dev);
|
|
if (!err && tb[IFLA_MTU])
|
|
ip6_tnl_change_mtu(dev, nla_get_u32(tb[IFLA_MTU]));
|
|
|
|
return err;
|
|
}
|
|
|
|
static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],
|
|
struct nlattr *data[],
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct ip6_tnl *t = netdev_priv(dev);
|
|
struct __ip6_tnl_parm p;
|
|
struct net *net = t->net;
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
struct ip_tunnel_encap ipencap;
|
|
|
|
if (dev == ip6n->fb_tnl_dev)
|
|
return -EINVAL;
|
|
|
|
if (ip6_tnl_netlink_encap_parms(data, &ipencap)) {
|
|
int err = ip6_tnl_encap_setup(t, &ipencap);
|
|
|
|
if (err < 0)
|
|
return err;
|
|
}
|
|
ip6_tnl_netlink_parms(data, &p);
|
|
if (p.collect_md)
|
|
return -EINVAL;
|
|
|
|
t = ip6_tnl_locate(net, &p, 0);
|
|
if (!IS_ERR(t)) {
|
|
if (t->dev != dev)
|
|
return -EEXIST;
|
|
} else
|
|
t = netdev_priv(dev);
|
|
|
|
return ip6_tnl_update(t, &p);
|
|
}
|
|
|
|
static void ip6_tnl_dellink(struct net_device *dev, struct list_head *head)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
|
|
if (dev != ip6n->fb_tnl_dev)
|
|
unregister_netdevice_queue(dev, head);
|
|
}
|
|
|
|
static size_t ip6_tnl_get_size(const struct net_device *dev)
|
|
{
|
|
return
|
|
/* IFLA_IPTUN_LINK */
|
|
nla_total_size(4) +
|
|
/* IFLA_IPTUN_LOCAL */
|
|
nla_total_size(sizeof(struct in6_addr)) +
|
|
/* IFLA_IPTUN_REMOTE */
|
|
nla_total_size(sizeof(struct in6_addr)) +
|
|
/* IFLA_IPTUN_TTL */
|
|
nla_total_size(1) +
|
|
/* IFLA_IPTUN_ENCAP_LIMIT */
|
|
nla_total_size(1) +
|
|
/* IFLA_IPTUN_FLOWINFO */
|
|
nla_total_size(4) +
|
|
/* IFLA_IPTUN_FLAGS */
|
|
nla_total_size(4) +
|
|
/* IFLA_IPTUN_PROTO */
|
|
nla_total_size(1) +
|
|
/* IFLA_IPTUN_ENCAP_TYPE */
|
|
nla_total_size(2) +
|
|
/* IFLA_IPTUN_ENCAP_FLAGS */
|
|
nla_total_size(2) +
|
|
/* IFLA_IPTUN_ENCAP_SPORT */
|
|
nla_total_size(2) +
|
|
/* IFLA_IPTUN_ENCAP_DPORT */
|
|
nla_total_size(2) +
|
|
/* IFLA_IPTUN_COLLECT_METADATA */
|
|
nla_total_size(0) +
|
|
/* IFLA_IPTUN_FWMARK */
|
|
nla_total_size(4) +
|
|
0;
|
|
}
|
|
|
|
static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *tunnel = netdev_priv(dev);
|
|
struct __ip6_tnl_parm *parm = &tunnel->parms;
|
|
|
|
if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
|
|
nla_put_in6_addr(skb, IFLA_IPTUN_LOCAL, &parm->laddr) ||
|
|
nla_put_in6_addr(skb, IFLA_IPTUN_REMOTE, &parm->raddr) ||
|
|
nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
|
|
nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
|
|
nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
|
|
nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags) ||
|
|
nla_put_u8(skb, IFLA_IPTUN_PROTO, parm->proto) ||
|
|
nla_put_u32(skb, IFLA_IPTUN_FWMARK, parm->fwmark))
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u16(skb, IFLA_IPTUN_ENCAP_TYPE, tunnel->encap.type) ||
|
|
nla_put_be16(skb, IFLA_IPTUN_ENCAP_SPORT, tunnel->encap.sport) ||
|
|
nla_put_be16(skb, IFLA_IPTUN_ENCAP_DPORT, tunnel->encap.dport) ||
|
|
nla_put_u16(skb, IFLA_IPTUN_ENCAP_FLAGS, tunnel->encap.flags))
|
|
goto nla_put_failure;
|
|
|
|
if (parm->collect_md)
|
|
if (nla_put_flag(skb, IFLA_IPTUN_COLLECT_METADATA))
|
|
goto nla_put_failure;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
struct net *ip6_tnl_get_link_net(const struct net_device *dev)
|
|
{
|
|
struct ip6_tnl *tunnel = netdev_priv(dev);
|
|
|
|
return tunnel->net;
|
|
}
|
|
EXPORT_SYMBOL(ip6_tnl_get_link_net);
|
|
|
|
static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {
|
|
[IFLA_IPTUN_LINK] = { .type = NLA_U32 },
|
|
[IFLA_IPTUN_LOCAL] = { .len = sizeof(struct in6_addr) },
|
|
[IFLA_IPTUN_REMOTE] = { .len = sizeof(struct in6_addr) },
|
|
[IFLA_IPTUN_TTL] = { .type = NLA_U8 },
|
|
[IFLA_IPTUN_ENCAP_LIMIT] = { .type = NLA_U8 },
|
|
[IFLA_IPTUN_FLOWINFO] = { .type = NLA_U32 },
|
|
[IFLA_IPTUN_FLAGS] = { .type = NLA_U32 },
|
|
[IFLA_IPTUN_PROTO] = { .type = NLA_U8 },
|
|
[IFLA_IPTUN_ENCAP_TYPE] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_ENCAP_FLAGS] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_ENCAP_SPORT] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_ENCAP_DPORT] = { .type = NLA_U16 },
|
|
[IFLA_IPTUN_COLLECT_METADATA] = { .type = NLA_FLAG },
|
|
[IFLA_IPTUN_FWMARK] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static struct rtnl_link_ops ip6_link_ops __read_mostly = {
|
|
.kind = "ip6tnl",
|
|
.maxtype = IFLA_IPTUN_MAX,
|
|
.policy = ip6_tnl_policy,
|
|
.priv_size = sizeof(struct ip6_tnl),
|
|
.setup = ip6_tnl_dev_setup,
|
|
.validate = ip6_tnl_validate,
|
|
.newlink = ip6_tnl_newlink,
|
|
.changelink = ip6_tnl_changelink,
|
|
.dellink = ip6_tnl_dellink,
|
|
.get_size = ip6_tnl_get_size,
|
|
.fill_info = ip6_tnl_fill_info,
|
|
.get_link_net = ip6_tnl_get_link_net,
|
|
};
|
|
|
|
static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
|
|
.handler = ip4ip6_rcv,
|
|
.err_handler = ip4ip6_err,
|
|
.priority = 1,
|
|
};
|
|
|
|
static struct xfrm6_tunnel ip6ip6_handler __read_mostly = {
|
|
.handler = ip6ip6_rcv,
|
|
.err_handler = ip6ip6_err,
|
|
.priority = 1,
|
|
};
|
|
|
|
static void __net_exit ip6_tnl_destroy_tunnels(struct net *net, struct list_head *list)
|
|
{
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
struct net_device *dev, *aux;
|
|
int h;
|
|
struct ip6_tnl *t;
|
|
|
|
for_each_netdev_safe(net, dev, aux)
|
|
if (dev->rtnl_link_ops == &ip6_link_ops)
|
|
unregister_netdevice_queue(dev, list);
|
|
|
|
for (h = 0; h < IP6_TUNNEL_HASH_SIZE; h++) {
|
|
t = rtnl_dereference(ip6n->tnls_r_l[h]);
|
|
while (t) {
|
|
/* If dev is in the same netns, it has already
|
|
* been added to the list by the previous loop.
|
|
*/
|
|
if (!net_eq(dev_net(t->dev), net))
|
|
unregister_netdevice_queue(t->dev, list);
|
|
t = rtnl_dereference(t->next);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __net_init ip6_tnl_init_net(struct net *net)
|
|
{
|
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);
|
|
struct ip6_tnl *t = NULL;
|
|
int err;
|
|
|
|
ip6n->tnls[0] = ip6n->tnls_wc;
|
|
ip6n->tnls[1] = ip6n->tnls_r_l;
|
|
|
|
if (!net_has_fallback_tunnels(net))
|
|
return 0;
|
|
err = -ENOMEM;
|
|
ip6n->fb_tnl_dev = alloc_netdev(sizeof(struct ip6_tnl), "ip6tnl0",
|
|
NET_NAME_UNKNOWN, ip6_tnl_dev_setup);
|
|
|
|
if (!ip6n->fb_tnl_dev)
|
|
goto err_alloc_dev;
|
|
dev_net_set(ip6n->fb_tnl_dev, net);
|
|
ip6n->fb_tnl_dev->rtnl_link_ops = &ip6_link_ops;
|
|
/* FB netdevice is special: we have one, and only one per netns.
|
|
* Allowing to move it to another netns is clearly unsafe.
|
|
*/
|
|
ip6n->fb_tnl_dev->features |= NETIF_F_NETNS_LOCAL;
|
|
|
|
err = ip6_fb_tnl_dev_init(ip6n->fb_tnl_dev);
|
|
if (err < 0)
|
|
goto err_register;
|
|
|
|
err = register_netdev(ip6n->fb_tnl_dev);
|
|
if (err < 0)
|
|
goto err_register;
|
|
|
|
t = netdev_priv(ip6n->fb_tnl_dev);
|
|
|
|
strcpy(t->parms.name, ip6n->fb_tnl_dev->name);
|
|
return 0;
|
|
|
|
err_register:
|
|
free_netdev(ip6n->fb_tnl_dev);
|
|
err_alloc_dev:
|
|
return err;
|
|
}
|
|
|
|
static void __net_exit ip6_tnl_exit_batch_net(struct list_head *net_list)
|
|
{
|
|
struct net *net;
|
|
LIST_HEAD(list);
|
|
|
|
rtnl_lock();
|
|
list_for_each_entry(net, net_list, exit_list)
|
|
ip6_tnl_destroy_tunnels(net, &list);
|
|
unregister_netdevice_many(&list);
|
|
rtnl_unlock();
|
|
}
|
|
|
|
static struct pernet_operations ip6_tnl_net_ops = {
|
|
.init = ip6_tnl_init_net,
|
|
.exit_batch = ip6_tnl_exit_batch_net,
|
|
.id = &ip6_tnl_net_id,
|
|
.size = sizeof(struct ip6_tnl_net),
|
|
};
|
|
|
|
/**
|
|
* ip6_tunnel_init - register protocol and reserve needed resources
|
|
*
|
|
* Return: 0 on success
|
|
**/
|
|
|
|
static int __init ip6_tunnel_init(void)
|
|
{
|
|
int err;
|
|
|
|
if (!ipv6_mod_enabled())
|
|
return -EOPNOTSUPP;
|
|
|
|
err = register_pernet_device(&ip6_tnl_net_ops);
|
|
if (err < 0)
|
|
goto out_pernet;
|
|
|
|
err = xfrm6_tunnel_register(&ip4ip6_handler, AF_INET);
|
|
if (err < 0) {
|
|
pr_err("%s: can't register ip4ip6\n", __func__);
|
|
goto out_ip4ip6;
|
|
}
|
|
|
|
err = xfrm6_tunnel_register(&ip6ip6_handler, AF_INET6);
|
|
if (err < 0) {
|
|
pr_err("%s: can't register ip6ip6\n", __func__);
|
|
goto out_ip6ip6;
|
|
}
|
|
err = rtnl_link_register(&ip6_link_ops);
|
|
if (err < 0)
|
|
goto rtnl_link_failed;
|
|
|
|
return 0;
|
|
|
|
rtnl_link_failed:
|
|
xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
|
|
out_ip6ip6:
|
|
xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
|
|
out_ip4ip6:
|
|
unregister_pernet_device(&ip6_tnl_net_ops);
|
|
out_pernet:
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ip6_tunnel_cleanup - free resources and unregister protocol
|
|
**/
|
|
|
|
static void __exit ip6_tunnel_cleanup(void)
|
|
{
|
|
rtnl_link_unregister(&ip6_link_ops);
|
|
if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
|
|
pr_info("%s: can't deregister ip4ip6\n", __func__);
|
|
|
|
if (xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6))
|
|
pr_info("%s: can't deregister ip6ip6\n", __func__);
|
|
|
|
unregister_pernet_device(&ip6_tnl_net_ops);
|
|
}
|
|
|
|
module_init(ip6_tunnel_init);
|
|
module_exit(ip6_tunnel_cleanup);
|