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author | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
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committer | Timothy Pearson <tpearson@raptorengineering.com> | 2017-08-23 14:45:25 -0500 |
commit | fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204 (patch) | |
tree | 22962a4387943edc841c72a4e636a068c66d58fd /net/ipv4/tunnel4.c | |
download | ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.zip ast2050-linux-kernel-fcbb27b0ec6dcbc5a5108cb8fb19eae64593d204.tar.gz |
Initial import of modified Linux 2.6.28 tree
Original upstream URL:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git | branch linux-2.6.28.y
Diffstat (limited to 'net/ipv4/tunnel4.c')
-rw-r--r-- | net/ipv4/tunnel4.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c new file mode 100644 index 0000000..cb1f0e8 --- /dev/null +++ b/net/ipv4/tunnel4.c @@ -0,0 +1,179 @@ +/* tunnel4.c: Generic IP tunnel transformer. + * + * Copyright (C) 2003 David S. Miller (davem@redhat.com) + */ + +#include <linux/init.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <linux/netdevice.h> +#include <linux/skbuff.h> +#include <net/icmp.h> +#include <net/ip.h> +#include <net/protocol.h> +#include <net/xfrm.h> + +static struct xfrm_tunnel *tunnel4_handlers; +static struct xfrm_tunnel *tunnel64_handlers; +static DEFINE_MUTEX(tunnel4_mutex); + +static inline struct xfrm_tunnel **fam_handlers(unsigned short family) +{ + return (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers; +} + +int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family) +{ + struct xfrm_tunnel **pprev; + int ret = -EEXIST; + int priority = handler->priority; + + mutex_lock(&tunnel4_mutex); + + for (pprev = fam_handlers(family); *pprev; pprev = &(*pprev)->next) { + if ((*pprev)->priority > priority) + break; + if ((*pprev)->priority == priority) + goto err; + } + + handler->next = *pprev; + *pprev = handler; + + ret = 0; + +err: + mutex_unlock(&tunnel4_mutex); + + return ret; +} + +EXPORT_SYMBOL(xfrm4_tunnel_register); + +int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family) +{ + struct xfrm_tunnel **pprev; + int ret = -ENOENT; + + mutex_lock(&tunnel4_mutex); + + for (pprev = fam_handlers(family); *pprev; pprev = &(*pprev)->next) { + if (*pprev == handler) { + *pprev = handler->next; + ret = 0; + break; + } + } + + mutex_unlock(&tunnel4_mutex); + + synchronize_net(); + + return ret; +} + +EXPORT_SYMBOL(xfrm4_tunnel_deregister); + +static int tunnel4_rcv(struct sk_buff *skb) +{ + struct xfrm_tunnel *handler; + + if (!pskb_may_pull(skb, sizeof(struct iphdr))) + goto drop; + + for (handler = tunnel4_handlers; handler; handler = handler->next) + if (!handler->handler(skb)) + return 0; + + icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); + +drop: + kfree_skb(skb); + return 0; +} + +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) +static int tunnel64_rcv(struct sk_buff *skb) +{ + struct xfrm_tunnel *handler; + + if (!pskb_may_pull(skb, sizeof(struct ipv6hdr))) + goto drop; + + for (handler = tunnel64_handlers; handler; handler = handler->next) + if (!handler->handler(skb)) + return 0; + + icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); + +drop: + kfree_skb(skb); + return 0; +} +#endif + +static void tunnel4_err(struct sk_buff *skb, u32 info) +{ + struct xfrm_tunnel *handler; + + for (handler = tunnel4_handlers; handler; handler = handler->next) + if (!handler->err_handler(skb, info)) + break; +} + +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) +static void tunnel64_err(struct sk_buff *skb, u32 info) +{ + struct xfrm_tunnel *handler; + + for (handler = tunnel64_handlers; handler; handler = handler->next) + if (!handler->err_handler(skb, info)) + break; +} +#endif + +static struct net_protocol tunnel4_protocol = { + .handler = tunnel4_rcv, + .err_handler = tunnel4_err, + .no_policy = 1, + .netns_ok = 1, +}; + +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) +static struct net_protocol tunnel64_protocol = { + .handler = tunnel64_rcv, + .err_handler = tunnel64_err, + .no_policy = 1, + .netns_ok = 1, +}; +#endif + +static int __init tunnel4_init(void) +{ + if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) { + printk(KERN_ERR "tunnel4 init: can't add protocol\n"); + return -EAGAIN; + } +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) { + printk(KERN_ERR "tunnel64 init: can't add protocol\n"); + inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP); + return -EAGAIN; + } +#endif + return 0; +} + +static void __exit tunnel4_fini(void) +{ +#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE) + if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6)) + printk(KERN_ERR "tunnel64 close: can't remove protocol\n"); +#endif + if (inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP)) + printk(KERN_ERR "tunnel4 close: can't remove protocol\n"); +} + +module_init(tunnel4_init); +module_exit(tunnel4_fini); +MODULE_LICENSE("GPL"); |