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1 | /* |
2 | * xfrm_output.c - Common IPsec encapsulation code. |
3 | * |
4 | * Copyright (c) 2007 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 | |
12 | #include <linux/errno.h> |
13 | #include <linux/module.h> |
14 | #include <linux/netdevice.h> |
15 | #include <linux/netfilter.h> |
16 | #include <linux/skbuff.h> |
17 | #include <linux/spinlock.h> |
18 | #include <net/dst.h> |
19 | #include <net/xfrm.h> |
20 | |
21 | static int xfrm_output2(struct sk_buff *skb); |
22 | |
23 | static int xfrm_state_check_space(struct xfrm_state *x, struct sk_buff *skb) |
24 | { |
25 | struct dst_entry *dst = skb_dst(skb); |
26 | int nhead = dst->header_len + LL_RESERVED_SPACE(dst->dev) |
27 | - skb_headroom(skb); |
28 | int ntail = dst->dev->needed_tailroom - skb_tailroom(skb); |
29 | |
30 | if (nhead <= 0) { |
31 | if (ntail <= 0) |
32 | return 0; |
33 | nhead = 0; |
34 | } else if (ntail < 0) |
35 | ntail = 0; |
36 | |
37 | return pskb_expand_head(skb, nhead, ntail, GFP_ATOMIC); |
38 | } |
39 | |
40 | static int xfrm_output_one(struct sk_buff *skb, int err) |
41 | { |
42 | struct dst_entry *dst = skb_dst(skb); |
43 | struct xfrm_state *x = dst->xfrm; |
44 | struct net *net = xs_net(x); |
45 | |
46 | if (err <= 0) |
47 | goto resume; |
48 | |
49 | do { |
50 | err = xfrm_state_check_space(x, skb); |
51 | if (err) { |
52 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); |
53 | goto error_nolock; |
54 | } |
55 | |
56 | err = x->outer_mode->output(x, skb); |
57 | if (err) { |
58 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEMODEERROR); |
59 | goto error_nolock; |
60 | } |
61 | |
62 | spin_lock_bh(&x->lock); |
63 | err = xfrm_state_check_expire(x); |
64 | if (err) { |
65 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEEXPIRED); |
66 | goto error; |
67 | } |
68 | |
69 | if (x->type->flags & XFRM_TYPE_REPLAY_PROT) { |
70 | XFRM_SKB_CB(skb)->seq.output = ++x->replay.oseq; |
71 | if (unlikely(x->replay.oseq == 0)) { |
72 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATESEQERROR); |
73 | x->replay.oseq--; |
74 | xfrm_audit_state_replay_overflow(x, skb); |
75 | err = -EOVERFLOW; |
76 | goto error; |
77 | } |
78 | if (xfrm_aevent_is_on(net)) |
79 | xfrm_replay_notify(x, XFRM_REPLAY_UPDATE); |
80 | } |
81 | |
82 | x->curlft.bytes += skb->len; |
83 | x->curlft.packets++; |
84 | |
85 | spin_unlock_bh(&x->lock); |
86 | |
87 | err = x->type->output(x, skb); |
88 | if (err == -EINPROGRESS) |
89 | goto out_exit; |
90 | |
91 | resume: |
92 | if (err) { |
93 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTSTATEPROTOERROR); |
94 | goto error_nolock; |
95 | } |
96 | |
97 | dst = dst_pop(dst); |
98 | if (!dst) { |
99 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); |
100 | err = -EHOSTUNREACH; |
101 | goto error_nolock; |
102 | } |
103 | skb_dst_set(skb, dst); |
104 | x = dst->xfrm; |
105 | } while (x && !(x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL)); |
106 | |
107 | err = 0; |
108 | |
109 | out_exit: |
110 | return err; |
111 | error: |
112 | spin_unlock_bh(&x->lock); |
113 | error_nolock: |
114 | kfree_skb(skb); |
115 | goto out_exit; |
116 | } |
117 | |
118 | int xfrm_output_resume(struct sk_buff *skb, int err) |
119 | { |
120 | while (likely((err = xfrm_output_one(skb, err)) == 0)) { |
121 | nf_reset(skb); |
122 | |
123 | err = skb_dst(skb)->ops->local_out(skb); |
124 | if (unlikely(err != 1)) |
125 | goto out; |
126 | |
127 | if (!skb_dst(skb)->xfrm) |
128 | return dst_output(skb); |
129 | |
130 | err = nf_hook(skb_dst(skb)->ops->family, |
131 | NF_INET_POST_ROUTING, skb, |
132 | NULL, skb_dst(skb)->dev, xfrm_output2); |
133 | if (unlikely(err != 1)) |
134 | goto out; |
135 | } |
136 | |
137 | if (err == -EINPROGRESS) |
138 | err = 0; |
139 | |
140 | out: |
141 | return err; |
142 | } |
143 | EXPORT_SYMBOL_GPL(xfrm_output_resume); |
144 | |
145 | static int xfrm_output2(struct sk_buff *skb) |
146 | { |
147 | return xfrm_output_resume(skb, 1); |
148 | } |
149 | |
150 | static int xfrm_output_gso(struct sk_buff *skb) |
151 | { |
152 | struct sk_buff *segs; |
153 | |
154 | segs = skb_gso_segment(skb, 0); |
155 | kfree_skb(skb); |
156 | if (IS_ERR(segs)) |
157 | return PTR_ERR(segs); |
158 | |
159 | do { |
160 | struct sk_buff *nskb = segs->next; |
161 | int err; |
162 | |
163 | segs->next = NULL; |
164 | err = xfrm_output2(segs); |
165 | |
166 | if (unlikely(err)) { |
167 | while ((segs = nskb)) { |
168 | nskb = segs->next; |
169 | segs->next = NULL; |
170 | kfree_skb(segs); |
171 | } |
172 | return err; |
173 | } |
174 | |
175 | segs = nskb; |
176 | } while (segs); |
177 | |
178 | return 0; |
179 | } |
180 | |
181 | int xfrm_output(struct sk_buff *skb) |
182 | { |
183 | struct net *net = dev_net(skb_dst(skb)->dev); |
184 | int err; |
185 | |
186 | if (skb_is_gso(skb)) |
187 | return xfrm_output_gso(skb); |
188 | |
189 | if (skb->ip_summed == CHECKSUM_PARTIAL) { |
190 | err = skb_checksum_help(skb); |
191 | if (err) { |
192 | XFRM_INC_STATS(net, LINUX_MIB_XFRMOUTERROR); |
193 | kfree_skb(skb); |
194 | return err; |
195 | } |
196 | } |
197 | |
198 | return xfrm_output2(skb); |
199 | } |
200 | |
201 | int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb) |
202 | { |
203 | struct xfrm_mode *inner_mode; |
204 | if (x->sel.family == AF_UNSPEC) |
205 | inner_mode = xfrm_ip2inner_mode(x, |
206 | xfrm_af2proto(skb_dst(skb)->ops->family)); |
207 | else |
208 | inner_mode = x->inner_mode; |
209 | |
210 | if (inner_mode == NULL) |
211 | return -EAFNOSUPPORT; |
212 | return inner_mode->afinfo->extract_output(x, skb); |
213 | } |
214 | |
215 | EXPORT_SYMBOL_GPL(xfrm_output); |
216 | EXPORT_SYMBOL_GPL(xfrm_inner_extract_output); |
217 |
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