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![Stephen Hemminger](/assets/img/avatar_default.png)
Ran simple script to find/remove trailing whitespace and blank lines at EOF because that kind of stuff git whines about and editors leave behind. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: David S. Miller <davem@davemloft.net>
250 lines
5.4 KiB
C
250 lines
5.4 KiB
C
/* tunnel4.c: Generic IP tunnel transformer.
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*
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* Copyright (C) 2003 David S. Miller (davem@redhat.com)
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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_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 void 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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break;
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}
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#if IS_ENABLED(CONFIG_IPV6)
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static void 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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break;
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}
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#endif
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#if IS_ENABLED(CONFIG_MPLS)
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static void 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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break;
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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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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_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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