projects / GitHub / mt8127 / android_kernel_alcatel_ttab.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | /* |
| 2 | * xfrm4_output.c - Common IPsec encapsulation code for IPv4. | |
| 3 | * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au> | |
| e905a9ed | 4 | * |
| 1da177e4 LT |
5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License | |
| 7 | * as published by the Free Software Foundation; either version | |
| 8 | * 2 of the License, or (at your option) any later version. | |
| 9 | */ | |
| 10 | ||
| 09b8f7a9 HX |
11 | #include <linux/if_ether.h> |
| 12 | #include <linux/kernel.h> | |
| 36cf9acf | 13 | #include <linux/module.h> |
| 1da177e4 | 14 | #include <linux/skbuff.h> |
| 16a6677f | 15 | #include <linux/netfilter_ipv4.h> |
| 36cf9acf | 16 | #include <net/dst.h> |
| 1da177e4 LT |
17 | #include <net/ip.h> |
| 18 | #include <net/xfrm.h> | |
| 19 | #include <net/icmp.h> | |
| 20 | ||
| 1da177e4 LT |
21 | static int xfrm4_tunnel_check_size(struct sk_buff *skb) |
| 22 | { | |
| 23 | int mtu, ret = 0; | |
| 24 | struct dst_entry *dst; | |
| 1da177e4 LT |
25 | |
| 26 | if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE) | |
| 27 | goto out; | |
| 28 | ||
| eddc9ec5 | 29 | if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->local_df) |
| 1da177e4 LT |
30 | goto out; |
| 31 | ||
| adf30907 | 32 | dst = skb_dst(skb); |
| 1da177e4 LT |
33 | mtu = dst_mtu(dst); |
| 34 | if (skb->len > mtu) { | |
| 35 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_FRAG_NEEDED, htonl(mtu)); | |
| 36 | ret = -EMSGSIZE; | |
| 37 | } | |
| 38 | out: | |
| 39 | return ret; | |
| 40 | } | |
| 41 | ||
| 36cf9acf HX |
42 | int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb) |
| 43 | { | |
| 44 | int err; | |
| 45 | ||
| 46 | err = xfrm4_tunnel_check_size(skb); | |
| 47 | if (err) | |
| 48 | return err; | |
| 49 | ||
| 60d5fcfb HX |
50 | XFRM_MODE_SKB_CB(skb)->protocol = ip_hdr(skb)->protocol; |
| 51 | ||
| 36cf9acf HX |
52 | return xfrm4_extract_header(skb); |
| 53 | } | |
| 54 | ||
| 55 | int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb) | |
| 56 | { | |
| 57 | int err; | |
| 58 | ||
| df9dcb45 | 59 | err = xfrm_inner_extract_output(x, skb); |
| 36cf9acf HX |
60 | if (err) |
| 61 | return err; | |
| 62 | ||
| 63 | memset(IPCB(skb), 0, sizeof(*IPCB(skb))); | |
| 862b82c6 | 64 | IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED; |
| 36cf9acf HX |
65 | |
| 66 | skb->protocol = htons(ETH_P_IP); | |
| 67 | ||
| 68 | return x->outer_mode->output2(x, skb); | |
| 69 | } | |
| 70 | EXPORT_SYMBOL(xfrm4_prepare_output); | |
| 71 | ||
| 43a4dea4 | 72 | int xfrm4_output_finish(struct sk_buff *skb) |
| 09b8f7a9 | 73 | { |
| 09b8f7a9 | 74 | #ifdef CONFIG_NETFILTER |
| adf30907 | 75 | if (!skb_dst(skb)->xfrm) { |
| 09b8f7a9 HX |
76 | IPCB(skb)->flags |= IPSKB_REROUTED; |
| 77 | return dst_output(skb); | |
| 78 | } | |
| 09b8f7a9 | 79 | |
| 862b82c6 HX |
80 | IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED; |
| 81 | #endif | |
| 09b8f7a9 HX |
82 | |
| 83 | skb->protocol = htons(ETH_P_IP); | |
| 862b82c6 | 84 | return xfrm_output(skb); |
| 09b8f7a9 HX |
85 | } |
| 86 | ||
| 16a6677f PM |
87 | int xfrm4_output(struct sk_buff *skb) |
| 88 | { | |
| 43a4dea4 SK |
89 | struct dst_entry *dst = skb_dst(skb); |
| 90 | struct xfrm_state *x = dst->xfrm; | |
| 91 | ||
| 9bbc768a | 92 | return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, skb, |
| 43a4dea4 SK |
93 | NULL, dst->dev, |
| 94 | x->outer_mode->afinfo->output_finish, | |
| 48d5cad8 | 95 | !(IPCB(skb)->flags & IPSKB_REROUTED)); |
| 16a6677f | 96 | } |