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300 lines
6.5 KiB
300 lines
6.5 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* tunnel4.c: Generic IP tunnel transformer. |
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* |
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* Copyright (C) 2003 David S. Miller ([email protected]) |
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*/ |
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#include <linux/init.h> |
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#include <linux/module.h> |
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#include <linux/mutex.h> |
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#include <linux/mpls.h> |
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#include <linux/netdevice.h> |
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#include <linux/skbuff.h> |
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#include <linux/slab.h> |
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#include <net/icmp.h> |
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#include <net/ip.h> |
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#include <net/protocol.h> |
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#include <net/xfrm.h> |
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static struct xfrm_tunnel __rcu *tunnel4_handlers __read_mostly; |
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static struct xfrm_tunnel __rcu *tunnel64_handlers __read_mostly; |
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static struct xfrm_tunnel __rcu *tunnelmpls4_handlers __read_mostly; |
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static DEFINE_MUTEX(tunnel4_mutex); |
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static inline struct xfrm_tunnel __rcu **fam_handlers(unsigned short family) |
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{ |
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return (family == AF_INET) ? &tunnel4_handlers : |
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(family == AF_INET6) ? &tunnel64_handlers : |
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&tunnelmpls4_handlers; |
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} |
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int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family) |
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{ |
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struct xfrm_tunnel __rcu **pprev; |
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struct xfrm_tunnel *t; |
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int ret = -EEXIST; |
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int priority = handler->priority; |
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mutex_lock(&tunnel4_mutex); |
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for (pprev = fam_handlers(family); |
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(t = rcu_dereference_protected(*pprev, |
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lockdep_is_held(&tunnel4_mutex))) != NULL; |
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pprev = &t->next) { |
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if (t->priority > priority) |
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break; |
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if (t->priority == priority) |
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goto err; |
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} |
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handler->next = *pprev; |
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rcu_assign_pointer(*pprev, handler); |
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ret = 0; |
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err: |
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mutex_unlock(&tunnel4_mutex); |
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return ret; |
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} |
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EXPORT_SYMBOL(xfrm4_tunnel_register); |
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int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family) |
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{ |
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struct xfrm_tunnel __rcu **pprev; |
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struct xfrm_tunnel *t; |
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int ret = -ENOENT; |
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mutex_lock(&tunnel4_mutex); |
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for (pprev = fam_handlers(family); |
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(t = rcu_dereference_protected(*pprev, |
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lockdep_is_held(&tunnel4_mutex))) != NULL; |
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pprev = &t->next) { |
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if (t == handler) { |
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*pprev = handler->next; |
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ret = 0; |
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break; |
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} |
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} |
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mutex_unlock(&tunnel4_mutex); |
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synchronize_net(); |
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return ret; |
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} |
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EXPORT_SYMBOL(xfrm4_tunnel_deregister); |
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#define for_each_tunnel_rcu(head, handler) \ |
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for (handler = rcu_dereference(head); \ |
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handler != NULL; \ |
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handler = rcu_dereference(handler->next)) \ |
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static int tunnel4_rcv(struct sk_buff *skb) |
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{ |
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struct xfrm_tunnel *handler; |
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if (!pskb_may_pull(skb, sizeof(struct iphdr))) |
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goto drop; |
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for_each_tunnel_rcu(tunnel4_handlers, handler) |
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if (!handler->handler(skb)) |
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return 0; |
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icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
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drop: |
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kfree_skb(skb); |
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return 0; |
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} |
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#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) |
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static int tunnel4_rcv_cb(struct sk_buff *skb, u8 proto, int err) |
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{ |
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struct xfrm_tunnel __rcu *head; |
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struct xfrm_tunnel *handler; |
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int ret; |
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head = (proto == IPPROTO_IPIP) ? tunnel4_handlers : tunnel64_handlers; |
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for_each_tunnel_rcu(head, handler) { |
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if (handler->cb_handler) { |
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ret = handler->cb_handler(skb, err); |
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if (ret <= 0) |
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return ret; |
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} |
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} |
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return 0; |
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} |
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static const struct xfrm_input_afinfo tunnel4_input_afinfo = { |
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.family = AF_INET, |
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.is_ipip = true, |
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.callback = tunnel4_rcv_cb, |
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}; |
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#endif |
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#if IS_ENABLED(CONFIG_IPV6) |
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static int tunnel64_rcv(struct sk_buff *skb) |
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{ |
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struct xfrm_tunnel *handler; |
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if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) |
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goto drop; |
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for_each_tunnel_rcu(tunnel64_handlers, handler) |
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if (!handler->handler(skb)) |
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return 0; |
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icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
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drop: |
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kfree_skb(skb); |
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return 0; |
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} |
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#endif |
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#if IS_ENABLED(CONFIG_MPLS) |
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static int tunnelmpls4_rcv(struct sk_buff *skb) |
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{ |
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struct xfrm_tunnel *handler; |
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if (!pskb_may_pull(skb, sizeof(struct mpls_label))) |
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goto drop; |
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for_each_tunnel_rcu(tunnelmpls4_handlers, handler) |
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if (!handler->handler(skb)) |
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return 0; |
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icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
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drop: |
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kfree_skb(skb); |
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return 0; |
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} |
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#endif |
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static int tunnel4_err(struct sk_buff *skb, u32 info) |
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{ |
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struct xfrm_tunnel *handler; |
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for_each_tunnel_rcu(tunnel4_handlers, handler) |
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if (!handler->err_handler(skb, info)) |
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return 0; |
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return -ENOENT; |
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} |
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#if IS_ENABLED(CONFIG_IPV6) |
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static int tunnel64_err(struct sk_buff *skb, u32 info) |
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{ |
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struct xfrm_tunnel *handler; |
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for_each_tunnel_rcu(tunnel64_handlers, handler) |
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if (!handler->err_handler(skb, info)) |
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return 0; |
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return -ENOENT; |
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} |
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#endif |
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#if IS_ENABLED(CONFIG_MPLS) |
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static int tunnelmpls4_err(struct sk_buff *skb, u32 info) |
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{ |
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struct xfrm_tunnel *handler; |
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for_each_tunnel_rcu(tunnelmpls4_handlers, handler) |
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if (!handler->err_handler(skb, info)) |
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return 0; |
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return -ENOENT; |
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} |
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#endif |
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static const struct net_protocol tunnel4_protocol = { |
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.handler = tunnel4_rcv, |
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.err_handler = tunnel4_err, |
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.no_policy = 1, |
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.netns_ok = 1, |
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}; |
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#if IS_ENABLED(CONFIG_IPV6) |
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static const struct net_protocol tunnel64_protocol = { |
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.handler = tunnel64_rcv, |
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.err_handler = tunnel64_err, |
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.no_policy = 1, |
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.netns_ok = 1, |
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}; |
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#endif |
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#if IS_ENABLED(CONFIG_MPLS) |
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static const struct net_protocol tunnelmpls4_protocol = { |
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.handler = tunnelmpls4_rcv, |
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.err_handler = tunnelmpls4_err, |
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.no_policy = 1, |
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.netns_ok = 1, |
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}; |
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#endif |
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static int __init tunnel4_init(void) |
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{ |
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if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) |
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goto err; |
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#if IS_ENABLED(CONFIG_IPV6) |
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if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) { |
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inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP); |
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goto err; |
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} |
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#endif |
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#if IS_ENABLED(CONFIG_MPLS) |
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if (inet_add_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS)) { |
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inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP); |
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#if IS_ENABLED(CONFIG_IPV6) |
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inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6); |
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#endif |
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goto err; |
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} |
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#endif |
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#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) |
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if (xfrm_input_register_afinfo(&tunnel4_input_afinfo)) { |
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inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP); |
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#if IS_ENABLED(CONFIG_IPV6) |
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inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6); |
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#endif |
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#if IS_ENABLED(CONFIG_MPLS) |
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inet_del_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS); |
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#endif |
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goto err; |
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} |
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#endif |
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return 0; |
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err: |
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pr_err("%s: can't add protocol\n", __func__); |
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return -EAGAIN; |
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} |
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static void __exit tunnel4_fini(void) |
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{ |
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#if IS_ENABLED(CONFIG_INET_XFRM_TUNNEL) |
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if (xfrm_input_unregister_afinfo(&tunnel4_input_afinfo)) |
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pr_err("tunnel4 close: can't remove input afinfo\n"); |
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#endif |
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#if IS_ENABLED(CONFIG_MPLS) |
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if (inet_del_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS)) |
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pr_err("tunnelmpls4 close: can't remove protocol\n"); |
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#endif |
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#if IS_ENABLED(CONFIG_IPV6) |
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if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6)) |
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pr_err("tunnel64 close: can't remove protocol\n"); |
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#endif |
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if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP)) |
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pr_err("tunnel4 close: can't remove protocol\n"); |
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} |
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module_init(tunnel4_init); |
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module_exit(tunnel4_fini); |
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MODULE_LICENSE("GPL");
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