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2396 lines
58 KiB
2396 lines
58 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
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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 <[email protected]> |
|
* Yasuyuki Kozakai <[email protected]> |
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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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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return hash_32(hash, IP6_TUNNEL_HASH_SIZE_SHIFT); |
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} |
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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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|
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static inline int ip6_tnl_mpls_supported(void) |
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{ |
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return IS_ENABLED(CONFIG_MPLS); |
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} |
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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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|
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/** |
|
* ip6_tnl_lookup - fetch tunnel matching the end-point addresses |
|
* @net: network namespace |
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* @link: ifindex of underlying interface |
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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: |
|
* 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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static struct ip6_tnl * |
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ip6_tnl_lookup(struct net *net, int link, |
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const struct in6_addr *remote, const struct in6_addr *local) |
|
{ |
|
unsigned int hash = HASH(remote, local); |
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struct ip6_tnl *t, *cand = NULL; |
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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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continue; |
|
|
|
if (link == t->parms.link) |
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return t; |
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else |
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cand = t; |
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} |
|
|
|
memset(&any, 0, sizeof(any)); |
|
hash = HASH(&any, local); |
|
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) || |
|
!(t->dev->flags & IFF_UP)) |
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continue; |
|
|
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if (link == t->parms.link) |
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return t; |
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else if (!cand) |
|
cand = t; |
|
} |
|
|
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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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continue; |
|
|
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if (link == t->parms.link) |
|
return t; |
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else if (!cand) |
|
cand = t; |
|
} |
|
|
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if (cand) |
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return cand; |
|
|
|
t = rcu_dereference(ip6n->collect_md_tun); |
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if (t && t->dev->flags & IFF_UP) |
|
return t; |
|
|
|
t = rcu_dereference(ip6n->tnls_wc[0]); |
|
if (t && (t->dev->flags & IFF_UP)) |
|
return t; |
|
|
|
return NULL; |
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} |
|
|
|
/** |
|
* ip6_tnl_bucket - get head of list matching given tunnel parameters |
|
* @ip6n: the private data for ip6_vti in the netns |
|
* @p: parameters containing tunnel end-points |
|
* |
|
* Description: |
|
* ip6_tnl_bucket() returns the head of the list matching the |
|
* &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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static struct ip6_tnl __rcu ** |
|
ip6_tnl_bucket(struct ip6_tnl_net *ip6n, const struct __ip6_tnl_parm *p) |
|
{ |
|
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; |
|
int prio = 0; |
|
|
|
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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return &ip6n->tnls[prio][h]; |
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} |
|
|
|
/** |
|
* ip6_tnl_link - add tunnel to hash table |
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* @ip6n: the private data for ip6_vti in the netns |
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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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* ip6_tnl_unlink - remove tunnel from hash table |
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* @ip6n: the private data for ip6_vti in the netns |
|
* @t: tunnel to be removed |
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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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{ |
|
struct ip6_tnl __rcu **tp; |
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struct ip6_tnl *iter; |
|
|
|
if (t->parms.collect_md) |
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rcu_assign_pointer(ip6n->collect_md_tun, NULL); |
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|
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for (tp = ip6_tnl_bucket(ip6n, &t->parms); |
|
(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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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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|
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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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|
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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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|
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strcpy(t->parms.name, dev->name); |
|
|
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ip6_tnl_link(ip6n, t); |
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return 0; |
|
|
|
out: |
|
return err; |
|
} |
|
|
|
/** |
|
* ip6_tnl_create - create a new tunnel |
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* @net: network namespace |
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* @p: tunnel parameters |
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* |
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* Description: |
|
* 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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|
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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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|
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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); |
|
} 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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|
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dev_net_set(dev, net); |
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|
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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; |
|
|
|
failed_free: |
|
free_netdev(dev); |
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failed: |
|
return ERR_PTR(err); |
|
} |
|
|
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/** |
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* ip6_tnl_locate - find or create tunnel matching given parameters |
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* @net: network namespace |
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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: |
|
* matching tunnel or error pointer |
|
**/ |
|
|
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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; |
|
struct ip6_tnl __rcu **tp; |
|
struct ip6_tnl *t; |
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
|
|
|
for (tp = ip6_tnl_bucket(ip6n, p); |
|
(t = rtnl_dereference(*tp)) != NULL; |
|
tp = &t->next) { |
|
if (ipv6_addr_equal(local, &t->parms.laddr) && |
|
ipv6_addr_equal(remote, &t->parms.raddr) && |
|
p->link == t->parms.link) { |
|
if (create) |
|
return ERR_PTR(-EEXIST); |
|
|
|
return t; |
|
} |
|
} |
|
if (!create) |
|
return ERR_PTR(-ENODEV); |
|
return ip6_tnl_create(net, p); |
|
} |
|
|
|
/** |
|
* ip6_tnl_dev_uninit - tunnel device uninitializer |
|
* @dev: the device to be destroyed |
|
* |
|
* Description: |
|
* ip6_tnl_dev_uninit() removes tunnel from its list |
|
**/ |
|
|
|
static void |
|
ip6_tnl_dev_uninit(struct net_device *dev) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct net *net = t->net; |
|
struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id); |
|
|
|
if (dev == ip6n->fb_tnl_dev) |
|
RCU_INIT_POINTER(ip6n->tnls_wc[0], NULL); |
|
else |
|
ip6_tnl_unlink(ip6n, t); |
|
dst_cache_reset(&t->dst_cache); |
|
dev_put(dev); |
|
} |
|
|
|
/** |
|
* parse_tvl_tnl_enc_lim - handle encapsulation limit option |
|
* @skb: received socket buffer |
|
* @raw: the ICMPv6 error message data |
|
* |
|
* Return: |
|
* 0 if none was found, |
|
* else index to encapsulation limit |
|
**/ |
|
|
|
__u16 ip6_tnl_parse_tlv_enc_lim(struct sk_buff *skb, __u8 *raw) |
|
{ |
|
const struct ipv6hdr *ipv6h = (const struct ipv6hdr *)raw; |
|
unsigned int nhoff = raw - skb->data; |
|
unsigned int off = nhoff + sizeof(*ipv6h); |
|
u8 next, nexthdr = ipv6h->nexthdr; |
|
|
|
while (ipv6_ext_hdr(nexthdr) && nexthdr != NEXTHDR_NONE) { |
|
struct ipv6_opt_hdr *hdr; |
|
u16 optlen; |
|
|
|
if (!pskb_may_pull(skb, off + sizeof(*hdr))) |
|
break; |
|
|
|
hdr = (struct ipv6_opt_hdr *)(skb->data + off); |
|
if (nexthdr == NEXTHDR_FRAGMENT) { |
|
struct frag_hdr *frag_hdr = (struct frag_hdr *) hdr; |
|
if (frag_hdr->frag_off) |
|
break; |
|
optlen = 8; |
|
} else if (nexthdr == NEXTHDR_AUTH) { |
|
optlen = ipv6_authlen(hdr); |
|
} 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() 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), skb->dev->ifindex, &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) { |
|
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: { |
|
struct ipv6_tlv_tnl_enc_lim *tel; |
|
__u32 teli; |
|
|
|
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: { |
|
__u32 mtu; |
|
|
|
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_TUNNEL6) { |
|
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_TUNNEL6) |
|
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_no_confirm(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 |
|
mplsip6_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_MPLS, opt, &rel_type, &rel_code, |
|
&rel_msg, &rel_info, offset); |
|
return err; |
|
} |
|
|
|
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); |
|
} |
|
|
|
static inline int mplsip6_dscp_ecn_decapsulate(const struct ip6_tnl *t, |
|
const struct ipv6hdr *ipv6h, |
|
struct sk_buff *skb) |
|
{ |
|
/* ECN is not supported in AF_MPLS */ |
|
return 0; |
|
} |
|
|
|
__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) |
|
{ |
|
int (*dscp_ecn_decapsulate)(const struct ip6_tnl *t, |
|
const struct ipv6hdr *ipv6h, |
|
struct sk_buff *skb); |
|
|
|
dscp_ecn_decapsulate = ip6ip6_dscp_ecn_decapsulate; |
|
if (tpi->proto == htons(ETH_P_IP)) |
|
dscp_ecn_decapsulate = ip4ip6_dscp_ecn_decapsulate; |
|
|
|
return __ip6_tnl_rcv(t, skb, tpi, tun_dst, 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 const struct tnl_ptk_info tpi_mpls = { |
|
/* no tunnel info required for mplsip6. */ |
|
.proto = htons(ETH_P_MPLS_UC), |
|
}; |
|
|
|
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), skb->dev->ifindex, &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); |
|
} |
|
|
|
static int mplsip6_rcv(struct sk_buff *skb) |
|
{ |
|
return ipxip6_rcv(skb, IPPROTO_MPLS, &tpi_mpls, |
|
mplsip6_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_no_confirm(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; |
|
|
|
skb_set_inner_ipproto(skb, proto); |
|
|
|
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 |
|
ipxip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev, |
|
u8 protocol) |
|
{ |
|
struct ip6_tnl *t = netdev_priv(dev); |
|
struct ipv6hdr *ipv6h; |
|
const struct iphdr *iph; |
|
int encap_limit = -1; |
|
__u16 offset; |
|
struct flowi6 fl6; |
|
__u8 dsfield, orig_dsfield; |
|
__u32 mtu; |
|
u8 tproto; |
|
int err; |
|
|
|
tproto = READ_ONCE(t->parms.proto); |
|
if (tproto != protocol && 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 = protocol; |
|
fl6.saddr = key->u.ipv6.src; |
|
fl6.daddr = key->u.ipv6.dst; |
|
fl6.flowlabel = key->label; |
|
dsfield = key->tos; |
|
switch (protocol) { |
|
case IPPROTO_IPIP: |
|
iph = ip_hdr(skb); |
|
orig_dsfield = ipv4_get_dsfield(iph); |
|
break; |
|
case IPPROTO_IPV6: |
|
ipv6h = ipv6_hdr(skb); |
|
orig_dsfield = ipv6_get_dsfield(ipv6h); |
|
break; |
|
default: |
|
orig_dsfield = dsfield; |
|
break; |
|
} |
|
} else { |
|
if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) |
|
encap_limit = t->parms.encap_limit; |
|
if (protocol == IPPROTO_IPV6) { |
|
offset = ip6_tnl_parse_tlv_enc_lim(skb, |
|
skb_network_header(skb)); |
|
/* ip6_tnl_parse_tlv_enc_lim() might have |
|
* reallocated skb->head |
|
*/ |
|
if (offset > 0) { |
|
struct ipv6_tlv_tnl_enc_lim *tel; |
|
|
|
tel = (void *)&skb_network_header(skb)[offset]; |
|
if (tel->encap_limit == 0) { |
|
icmpv6_ndo_send(skb, ICMPV6_PARAMPROB, |
|
ICMPV6_HDR_FIELD, offset + 2); |
|
return -1; |
|
} |
|
encap_limit = tel->encap_limit - 1; |
|
} |
|
} |
|
|
|
memcpy(&fl6, &t->fl.u.ip6, sizeof(fl6)); |
|
fl6.flowi6_proto = protocol; |
|
|
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FWMARK) |
|
fl6.flowi6_mark = skb->mark; |
|
else |
|
fl6.flowi6_mark = t->parms.fwmark; |
|
switch (protocol) { |
|
case IPPROTO_IPIP: |
|
iph = ip_hdr(skb); |
|
orig_dsfield = ipv4_get_dsfield(iph); |
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
|
dsfield = orig_dsfield; |
|
else |
|
dsfield = ip6_tclass(t->parms.flowinfo); |
|
break; |
|
case IPPROTO_IPV6: |
|
ipv6h = ipv6_hdr(skb); |
|
orig_dsfield = ipv6_get_dsfield(ipv6h); |
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_TCLASS) |
|
dsfield = orig_dsfield; |
|
else |
|
dsfield = ip6_tclass(t->parms.flowinfo); |
|
if (t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL) |
|
fl6.flowlabel |= ip6_flowlabel(ipv6h); |
|
break; |
|
default: |
|
orig_dsfield = dsfield = ip6_tclass(t->parms.flowinfo); |
|
break; |
|
} |
|
} |
|
|
|
fl6.flowi6_uid = sock_net_uid(dev_net(dev), NULL); |
|
dsfield = INET_ECN_encapsulate(dsfield, orig_dsfield); |
|
|
|
if (iptunnel_handle_offloads(skb, SKB_GSO_IPXIP6)) |
|
return -1; |
|
|
|
err = ip6_tnl_xmit(skb, dev, dsfield, &fl6, encap_limit, &mtu, |
|
protocol); |
|
if (err != 0) { |
|
/* XXX: send ICMP error even if DF is not set. */ |
|
if (err == -EMSGSIZE) |
|
switch (protocol) { |
|
case IPPROTO_IPIP: |
|
icmp_ndo_send(skb, ICMP_DEST_UNREACH, |
|
ICMP_FRAG_NEEDED, htonl(mtu)); |
|
break; |
|
case IPPROTO_IPV6: |
|
icmpv6_ndo_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu); |
|
break; |
|
default: |
|
break; |
|
} |
|
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; |
|
u8 ipproto; |
|
int ret; |
|
|
|
if (!pskb_inet_may_pull(skb)) |
|
goto tx_err; |
|
|
|
switch (skb->protocol) { |
|
case htons(ETH_P_IP): |
|
ipproto = IPPROTO_IPIP; |
|
break; |
|
case htons(ETH_P_IPV6): |
|
if (ip6_tnl_addr_conflict(t, ipv6_hdr(skb))) |
|
goto tx_err; |
|
ipproto = IPPROTO_IPV6; |
|
break; |
|
case htons(ETH_P_MPLS_UC): |
|
ipproto = IPPROTO_MPLS; |
|
break; |
|
default: |
|
goto tx_err; |
|
} |
|
|
|
ret = ipxip6_tnl_xmit(skb, dev, ipproto); |
|
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 net_device *tdev = NULL; |
|
struct __ip6_tnl_parm *p = &t->parms; |
|
struct flowi6 *fl6 = &t->fl.u.ip6; |
|
unsigned int mtu; |
|
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) { |
|
tdev = rt->dst.dev; |
|
ip6_rt_put(rt); |
|
} |
|
|
|
if (!tdev && p->link) |
|
tdev = __dev_get_by_index(t->net, p->link); |
|
|
|
if (tdev) { |
|
dev->hard_header_len = tdev->hard_header_len + t_hlen; |
|
mtu = min_t(unsigned int, tdev->mtu, IP6_MAX_MTU); |
|
|
|
dev->mtu = 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_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_stats64 = dev_get_tstats64, |
|
.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->header_ops = &ip_tunnel_header_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; |
|
|
|
dev_hold(dev); |
|
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) |
|
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; |
|
|
|
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 struct xfrm6_tunnel mplsip6_handler __read_mostly = { |
|
.handler = mplsip6_rcv, |
|
.err_handler = mplsip6_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); |
|
} |
|
} |
|
|
|
t = rtnl_dereference(ip6n->tnls_wc[0]); |
|
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; |
|
} |
|
|
|
if (ip6_tnl_mpls_supported()) { |
|
err = xfrm6_tunnel_register(&mplsip6_handler, AF_MPLS); |
|
if (err < 0) { |
|
pr_err("%s: can't register mplsip6\n", __func__); |
|
goto out_mplsip6; |
|
} |
|
} |
|
|
|
err = rtnl_link_register(&ip6_link_ops); |
|
if (err < 0) |
|
goto rtnl_link_failed; |
|
|
|
return 0; |
|
|
|
rtnl_link_failed: |
|
if (ip6_tnl_mpls_supported()) |
|
xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS); |
|
out_mplsip6: |
|
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__); |
|
|
|
if (ip6_tnl_mpls_supported() && |
|
xfrm6_tunnel_deregister(&mplsip6_handler, AF_MPLS)) |
|
pr_info("%s: can't deregister mplsip6\n", __func__); |
|
unregister_pernet_device(&ip6_tnl_net_ops); |
|
} |
|
|
|
module_init(ip6_tunnel_init); |
|
module_exit(ip6_tunnel_cleanup);
|
|
|