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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> | |
1ab1457c | 5 | * |
1da177e4 LT |
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 | ||
aee5adb4 MN |
20 | int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb, |
21 | u8 **prevhdr) | |
22 | { | |
23 | return ip6_find_1stfragopt(skb, prevhdr); | |
24 | } | |
25 | ||
7159039a YH |
26 | EXPORT_SYMBOL(xfrm6_find_1stfragopt); |
27 | ||
1da177e4 LT |
28 | static int xfrm6_tunnel_check_size(struct sk_buff *skb) |
29 | { | |
30 | int mtu, ret = 0; | |
31 | struct dst_entry *dst = skb->dst; | |
32 | ||
33 | mtu = dst_mtu(dst); | |
34 | if (mtu < IPV6_MIN_MTU) | |
35 | mtu = IPV6_MIN_MTU; | |
36 | ||
37 | if (skb->len > mtu) { | |
180e4250 | 38 | skb->dev = dst->dev; |
1da177e4 LT |
39 | icmpv6_send(skb, ICMPV6_PKT_TOOBIG, 0, mtu, skb->dev); |
40 | ret = -EMSGSIZE; | |
41 | } | |
42 | ||
43 | return ret; | |
44 | } | |
45 | ||
16a6677f | 46 | static int xfrm6_output_one(struct sk_buff *skb) |
1da177e4 LT |
47 | { |
48 | struct dst_entry *dst = skb->dst; | |
49 | struct xfrm_state *x = dst->xfrm; | |
50 | int err; | |
1ab1457c | 51 | |
84fa7933 PM |
52 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
53 | err = skb_checksum_help(skb); | |
1da177e4 LT |
54 | if (err) |
55 | goto error_nolock; | |
56 | } | |
57 | ||
7e49e6de | 58 | if (x->props.mode == XFRM_MODE_TUNNEL) { |
1da177e4 LT |
59 | err = xfrm6_tunnel_check_size(skb); |
60 | if (err) | |
61 | goto error_nolock; | |
62 | } | |
63 | ||
16a6677f PM |
64 | do { |
65 | spin_lock_bh(&x->lock); | |
66 | err = xfrm_state_check(x, skb); | |
67 | if (err) | |
68 | goto error; | |
1da177e4 | 69 | |
eb878e84 | 70 | err = x->mode->output(x, skb); |
b59f45d0 HX |
71 | if (err) |
72 | goto error; | |
1da177e4 | 73 | |
16a6677f PM |
74 | err = x->type->output(x, skb); |
75 | if (err) | |
76 | goto error; | |
1da177e4 | 77 | |
16a6677f PM |
78 | x->curlft.bytes += skb->len; |
79 | x->curlft.packets++; | |
9afaca05 | 80 | if (x->props.mode == XFRM_MODE_ROUTEOPTIMIZATION) |
9d729f72 | 81 | x->lastused = get_seconds(); |
1da177e4 | 82 | |
16a6677f | 83 | spin_unlock_bh(&x->lock); |
1da177e4 | 84 | |
c1d2bbe1 | 85 | skb_reset_network_header(skb); |
1ab1457c | 86 | |
16a6677f PM |
87 | if (!(skb->dst = dst_pop(dst))) { |
88 | err = -EHOSTUNREACH; | |
89 | goto error_nolock; | |
90 | } | |
91 | dst = skb->dst; | |
92 | x = dst->xfrm; | |
7e49e6de | 93 | } while (x && (x->props.mode != XFRM_MODE_TUNNEL)); |
16a6677f | 94 | |
3e3850e9 | 95 | IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED; |
16a6677f | 96 | err = 0; |
1da177e4 LT |
97 | |
98 | out_exit: | |
99 | return err; | |
100 | error: | |
101 | spin_unlock_bh(&x->lock); | |
102 | error_nolock: | |
103 | kfree_skb(skb); | |
104 | goto out_exit; | |
105 | } | |
16a6677f | 106 | |
09b8f7a9 | 107 | static int xfrm6_output_finish2(struct sk_buff *skb) |
16a6677f PM |
108 | { |
109 | int err; | |
110 | ||
111 | while (likely((err = xfrm6_output_one(skb)) == 0)) { | |
112 | nf_reset(skb); | |
1ab1457c | 113 | |
16a6677f PM |
114 | err = nf_hook(PF_INET6, NF_IP6_LOCAL_OUT, &skb, NULL, |
115 | skb->dst->dev, dst_output); | |
116 | if (unlikely(err != 1)) | |
117 | break; | |
118 | ||
119 | if (!skb->dst->xfrm) | |
120 | return dst_output(skb); | |
121 | ||
122 | err = nf_hook(PF_INET6, NF_IP6_POST_ROUTING, &skb, NULL, | |
09b8f7a9 | 123 | skb->dst->dev, xfrm6_output_finish2); |
16a6677f PM |
124 | if (unlikely(err != 1)) |
125 | break; | |
126 | } | |
127 | ||
128 | return err; | |
129 | } | |
130 | ||
09b8f7a9 HX |
131 | static int xfrm6_output_finish(struct sk_buff *skb) |
132 | { | |
133 | struct sk_buff *segs; | |
134 | ||
89114afd | 135 | if (!skb_is_gso(skb)) |
09b8f7a9 HX |
136 | return xfrm6_output_finish2(skb); |
137 | ||
679e898a | 138 | skb->protocol = htons(ETH_P_IPV6); |
09b8f7a9 HX |
139 | segs = skb_gso_segment(skb, 0); |
140 | kfree_skb(skb); | |
141 | if (unlikely(IS_ERR(segs))) | |
142 | return PTR_ERR(segs); | |
143 | ||
144 | do { | |
145 | struct sk_buff *nskb = segs->next; | |
146 | int err; | |
147 | ||
148 | segs->next = NULL; | |
149 | err = xfrm6_output_finish2(segs); | |
150 | ||
151 | if (unlikely(err)) { | |
152 | while ((segs = nskb)) { | |
153 | nskb = segs->next; | |
154 | segs->next = NULL; | |
155 | kfree_skb(segs); | |
156 | } | |
157 | return err; | |
158 | } | |
159 | ||
160 | segs = nskb; | |
161 | } while (segs); | |
162 | ||
163 | return 0; | |
164 | } | |
165 | ||
16a6677f PM |
166 | int xfrm6_output(struct sk_buff *skb) |
167 | { | |
168 | return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dst->dev, | |
169 | xfrm6_output_finish); | |
170 | } |