diff options
author | Jeff Garzik <jeff@garzik.org> | 2006-03-29 17:18:49 -0500 |
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committer | Jeff Garzik <jeff@garzik.org> | 2006-03-29 17:18:49 -0500 |
commit | e02a4cabfcb9a999b74a2e2e6f13ffcb7ff2d606 (patch) | |
tree | 2f3db60be4c57eca2a4c3ab3f3122dcf1ec0c624 /net/ipv4/tunnel4.c | |
parent | 600511e86babe3727264a0883a3a264f6fb6caf5 (diff) | |
parent | f3cab8a0b1a772dc8b055b7affa567a366627c9e (diff) |
Merge branch 'master'
Diffstat (limited to 'net/ipv4/tunnel4.c')
-rw-r--r-- | net/ipv4/tunnel4.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c new file mode 100644 index 00000000000..0d7d386dac2 --- /dev/null +++ b/net/ipv4/tunnel4.c @@ -0,0 +1,113 @@ +/* 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/protocol.h> +#include <net/xfrm.h> + +static struct xfrm_tunnel *tunnel4_handlers; +static DEFINE_MUTEX(tunnel4_mutex); + +int xfrm4_tunnel_register(struct xfrm_tunnel *handler) +{ + struct xfrm_tunnel **pprev; + int ret = -EEXIST; + int priority = handler->priority; + + mutex_lock(&tunnel4_mutex); + + for (pprev = &tunnel4_handlers; *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) +{ + struct xfrm_tunnel **pprev; + int ret = -ENOENT; + + mutex_lock(&tunnel4_mutex); + + for (pprev = &tunnel4_handlers; *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; + + for (handler = tunnel4_handlers; handler; handler = handler->next) + if (!handler->handler(skb)) + return 0; + + kfree_skb(skb); + return 0; +} + +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; +} + +static struct net_protocol tunnel4_protocol = { + .handler = tunnel4_rcv, + .err_handler = tunnel4_err, + .no_policy = 1, +}; + +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; + } + return 0; +} + +static void __exit tunnel4_fini(void) +{ + 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"); |