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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv4/xfrm4_tunnel.c | |
download | kernel_samsung_tuna-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip kernel_samsung_tuna-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz kernel_samsung_tuna-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'net/ipv4/xfrm4_tunnel.c')
-rw-r--r-- | net/ipv4/xfrm4_tunnel.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/net/ipv4/xfrm4_tunnel.c b/net/ipv4/xfrm4_tunnel.c new file mode 100644 index 0000000..413191f --- /dev/null +++ b/net/ipv4/xfrm4_tunnel.c @@ -0,0 +1,144 @@ +/* xfrm4_tunnel.c: Generic IP tunnel transformer. + * + * Copyright (C) 2003 David S. Miller (davem@redhat.com) + */ + +#include <linux/skbuff.h> +#include <linux/module.h> +#include <net/xfrm.h> +#include <net/ip.h> +#include <net/protocol.h> + +static int ipip_output(struct xfrm_state *x, struct sk_buff *skb) +{ + struct iphdr *iph; + + iph = skb->nh.iph; + iph->tot_len = htons(skb->len); + ip_send_check(iph); + + return 0; +} + +static int ipip_xfrm_rcv(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb) +{ + return 0; +} + +static struct xfrm_tunnel *ipip_handler; +static DECLARE_MUTEX(xfrm4_tunnel_sem); + +int xfrm4_tunnel_register(struct xfrm_tunnel *handler) +{ + int ret; + + down(&xfrm4_tunnel_sem); + ret = 0; + if (ipip_handler != NULL) + ret = -EINVAL; + if (!ret) + ipip_handler = handler; + up(&xfrm4_tunnel_sem); + + return ret; +} + +EXPORT_SYMBOL(xfrm4_tunnel_register); + +int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler) +{ + int ret; + + down(&xfrm4_tunnel_sem); + ret = 0; + if (ipip_handler != handler) + ret = -EINVAL; + if (!ret) + ipip_handler = NULL; + up(&xfrm4_tunnel_sem); + + synchronize_net(); + + return ret; +} + +EXPORT_SYMBOL(xfrm4_tunnel_deregister); + +static int ipip_rcv(struct sk_buff *skb) +{ + struct xfrm_tunnel *handler = ipip_handler; + + /* Tunnel devices take precedence. */ + if (handler && handler->handler(skb) == 0) + return 0; + + return xfrm4_rcv(skb); +} + +static void ipip_err(struct sk_buff *skb, u32 info) +{ + struct xfrm_tunnel *handler = ipip_handler; + u32 arg = info; + + if (handler) + handler->err_handler(skb, &arg); +} + +static int ipip_init_state(struct xfrm_state *x, void *args) +{ + if (!x->props.mode) + return -EINVAL; + + if (x->encap) + return -EINVAL; + + x->props.header_len = sizeof(struct iphdr); + + return 0; +} + +static void ipip_destroy(struct xfrm_state *x) +{ +} + +static struct xfrm_type ipip_type = { + .description = "IPIP", + .owner = THIS_MODULE, + .proto = IPPROTO_IPIP, + .init_state = ipip_init_state, + .destructor = ipip_destroy, + .input = ipip_xfrm_rcv, + .output = ipip_output +}; + +static struct net_protocol ipip_protocol = { + .handler = ipip_rcv, + .err_handler = ipip_err, + .no_policy = 1, +}; + +static int __init ipip_init(void) +{ + if (xfrm_register_type(&ipip_type, AF_INET) < 0) { + printk(KERN_INFO "ipip init: can't add xfrm type\n"); + return -EAGAIN; + } + if (inet_add_protocol(&ipip_protocol, IPPROTO_IPIP) < 0) { + printk(KERN_INFO "ipip init: can't add protocol\n"); + xfrm_unregister_type(&ipip_type, AF_INET); + return -EAGAIN; + } + return 0; +} + +static void __exit ipip_fini(void) +{ + if (inet_del_protocol(&ipip_protocol, IPPROTO_IPIP) < 0) + printk(KERN_INFO "ipip close: can't remove protocol\n"); + if (xfrm_unregister_type(&ipip_type, AF_INET) < 0) + printk(KERN_INFO "ipip close: can't remove xfrm type\n"); +} + +module_init(ipip_init); +module_exit(ipip_fini); +MODULE_LICENSE("GPL"); |