Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * xfrm6_output.c - Common IPsec encapsulation code for IPv6. | |
3 | * Copyright (C) 2002 USAGI/WIDE Project | |
4 | * Copyright (c) 2004 Herbert Xu <herbert@gondor.apana.org.au> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
16a6677f | 12 | #include <linux/compiler.h> |
1da177e4 LT |
13 | #include <linux/skbuff.h> |
14 | #include <linux/spinlock.h> | |
15 | #include <linux/icmpv6.h> | |
16a6677f | 16 | #include <linux/netfilter_ipv6.h> |
1da177e4 LT |
17 | #include <net/ipv6.h> |
18 | #include <net/xfrm.h> | |
19 | ||
1da177e4 LT |
20 | static int xfrm6_tunnel_check_size(struct sk_buff *skb) |
21 | { | |
22 | int mtu, ret = 0; | |
23 | struct dst_entry *dst = skb->dst; | |
24 | ||
25 | mtu = dst_mtu(dst); | |
26 | if (mtu < IPV6_MIN_MTU) | |
27 | mtu = IPV6_MIN_MTU; | |
28 | ||
29 | if (skb->len > mtu) { | |
180e4250 | 30 | skb->dev = dst->dev; |
1da177e4 LT |
31 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); |
32 | ret = -EMSGSIZE; | |
33 | } | |
34 | ||
35 | return ret; | |
36 | } | |
37 | ||
16a6677f | 38 | static int xfrm6_output_one(struct sk_buff *skb) |
1da177e4 LT |
39 | { |
40 | struct dst_entry *dst = skb->dst; | |
41 | struct xfrm_state *x = dst->xfrm; | |
42 | int err; | |
43 | ||
84fa7933 PM |
44 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
45 | err = skb_checksum_help(skb); | |
1da177e4 LT |
46 | if (err) |
47 | goto error_nolock; | |
48 | } | |
49 | ||
7e49e6de | 50 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
51 | err = xfrm6_tunnel_check_size(skb); |
52 | if (err) | |
53 | goto error_nolock; | |
54 | } | |
55 | ||
16a6677f PM |
56 | do { |
57 | spin_lock_bh(&x->lock); | |
58 | err = xfrm_state_check(x, skb); | |
59 | if (err) | |
60 | goto error; | |
1da177e4 | 61 | |
b59f45d0 HX |
62 | err = x->mode->output(skb); |
63 | if (err) | |
64 | goto error; | |
1da177e4 | 65 | |
16a6677f PM |
66 | err = x->type->output(x, skb); |
67 | if (err) | |
68 | goto error; | |
1da177e4 | 69 | |
16a6677f PM |
70 | x->curlft.bytes += skb->len; |
71 | x->curlft.packets++; | |
1da177e4 | 72 | |
16a6677f | 73 | spin_unlock_bh(&x->lock); |
1da177e4 | 74 | |
16a6677f PM |
75 | skb->nh.raw = skb->data; |
76 | ||
77 | if (!(skb->dst = dst_pop(dst))) { | |
78 | err = -EHOSTUNREACH; | |
79 | goto error_nolock; | |
80 | } | |
81 | dst = skb->dst; | |
82 | x = dst->xfrm; | |
7e49e6de | 83 | } while (x && (x->props.mode != XFRM_MODE_TUNNEL)); |
16a6677f | 84 | |
3e3850e9 | 85 | IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; |
16a6677f | 86 | err = 0; |
1da177e4 LT |
87 | |
88 | out_exit: | |
89 | return err; | |
90 | error: | |
91 | spin_unlock_bh(&x->lock); | |
92 | error_nolock: | |
93 | kfree_skb(skb); | |
94 | goto out_exit; | |
95 | } | |
16a6677f | 96 | |
09b8f7a9 | 97 | static int xfrm6_output_finish2(struct sk_buff *skb) |
16a6677f PM |
98 | { |
99 | int err; | |
100 | ||
101 | while (likely((err = xfrm6_output_one(skb)) == 0)) { | |
102 | nf_reset(skb); | |
103 | ||
104 | err = nf_hook(PF_INET6, NF_IP6_LOCAL_OUT, &skb, NULL, | |
105 | skb->dst->dev, dst_output); | |
106 | if (unlikely(err != 1)) | |
107 | break; | |
108 | ||
109 | if (!skb->dst->xfrm) | |
110 | return dst_output(skb); | |
111 | ||
112 | err = nf_hook(PF_INET6, NF_IP6_POST_ROUTING, &skb, NULL, | |
09b8f7a9 | 113 | skb->dst->dev, xfrm6_output_finish2); |
16a6677f PM |
114 | if (unlikely(err != 1)) |
115 | break; | |
116 | } | |
117 | ||
118 | return err; | |
119 | } | |
120 | ||
09b8f7a9 HX |
121 | static int xfrm6_output_finish(struct sk_buff *skb) |
122 | { | |
123 | struct sk_buff *segs; | |
124 | ||
89114afd | 125 | if (!skb_is_gso(skb)) |
09b8f7a9 HX |
126 | return xfrm6_output_finish2(skb); |
127 | ||
679e898a | 128 | skb->protocol = htons(ETH_P_IPV6); |
09b8f7a9 HX |
129 | segs = skb_gso_segment(skb, 0); |
130 | kfree_skb(skb); | |
131 | if (unlikely(IS_ERR(segs))) | |
132 | return PTR_ERR(segs); | |
133 | ||
134 | do { | |
135 | struct sk_buff *nskb = segs->next; | |
136 | int err; | |
137 | ||
138 | segs->next = NULL; | |
139 | err = xfrm6_output_finish2(segs); | |
140 | ||
141 | if (unlikely(err)) { | |
142 | while ((segs = nskb)) { | |
143 | nskb = segs->next; | |
144 | segs->next = NULL; | |
145 | kfree_skb(segs); | |
146 | } | |
147 | return err; | |
148 | } | |
149 | ||
150 | segs = nskb; | |
151 | } while (segs); | |
152 | ||
153 | return 0; | |
154 | } | |
155 | ||
16a6677f PM |
156 | int xfrm6_output(struct sk_buff *skb) |
157 | { | |
158 | return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dst->dev, | |
159 | xfrm6_output_finish); | |
160 | } |