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1 | /* |
2 | * xfrm_input.c |
3 | * |
4 | * Changes: |
5 | * YOSHIFUJI Hideaki @USAGI |
6 | * Split up af-specific portion |
7 | * |
8 | */ |
9 | |
10 | #include <linux/slab.h> |
11 | #include <linux/module.h> |
12 | #include <linux/netdevice.h> |
13 | #include <net/dst.h> |
14 | #include <net/ip.h> |
15 | #include <net/xfrm.h> |
16 | |
17 | static struct kmem_cache *secpath_cachep __read_mostly; |
18 | |
19 | void __secpath_destroy(struct sec_path *sp) |
20 | { |
21 | int i; |
22 | for (i = 0; i < sp->len; i++) |
23 | xfrm_state_put(sp->xvec[i]); |
24 | kmem_cache_free(secpath_cachep, sp); |
25 | } |
26 | EXPORT_SYMBOL(__secpath_destroy); |
27 | |
28 | struct sec_path *secpath_dup(struct sec_path *src) |
29 | { |
30 | struct sec_path *sp; |
31 | |
32 | sp = kmem_cache_alloc(secpath_cachep, GFP_ATOMIC); |
33 | if (!sp) |
34 | return NULL; |
35 | |
36 | sp->len = 0; |
37 | if (src) { |
38 | int i; |
39 | |
40 | memcpy(sp, src, sizeof(*sp)); |
41 | for (i = 0; i < sp->len; i++) |
42 | xfrm_state_hold(sp->xvec[i]); |
43 | } |
44 | atomic_set(&sp->refcnt, 1); |
45 | return sp; |
46 | } |
47 | EXPORT_SYMBOL(secpath_dup); |
48 | |
49 | /* Fetch spi and seq from ipsec header */ |
50 | |
51 | int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq) |
52 | { |
53 | int offset, offset_seq; |
54 | int hlen; |
55 | |
56 | switch (nexthdr) { |
57 | case IPPROTO_AH: |
58 | hlen = sizeof(struct ip_auth_hdr); |
59 | offset = offsetof(struct ip_auth_hdr, spi); |
60 | offset_seq = offsetof(struct ip_auth_hdr, seq_no); |
61 | break; |
62 | case IPPROTO_ESP: |
63 | hlen = sizeof(struct ip_esp_hdr); |
64 | offset = offsetof(struct ip_esp_hdr, spi); |
65 | offset_seq = offsetof(struct ip_esp_hdr, seq_no); |
66 | break; |
67 | case IPPROTO_COMP: |
68 | if (!pskb_may_pull(skb, sizeof(struct ip_comp_hdr))) |
69 | return -EINVAL; |
70 | *spi = htonl(ntohs(*(__be16*)(skb_transport_header(skb) + 2))); |
71 | *seq = 0; |
72 | return 0; |
73 | default: |
74 | return 1; |
75 | } |
76 | |
77 | if (!pskb_may_pull(skb, hlen)) |
78 | return -EINVAL; |
79 | |
80 | *spi = *(__be32*)(skb_transport_header(skb) + offset); |
81 | *seq = *(__be32*)(skb_transport_header(skb) + offset_seq); |
82 | return 0; |
83 | } |
84 | |
85 | int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb) |
86 | { |
87 | struct xfrm_mode *inner_mode = x->inner_mode; |
88 | int err; |
89 | |
90 | err = x->outer_mode->afinfo->extract_input(x, skb); |
91 | if (err) |
92 | return err; |
93 | |
94 | if (x->sel.family == AF_UNSPEC) { |
95 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); |
96 | if (inner_mode == NULL) |
97 | return -EAFNOSUPPORT; |
98 | } |
99 | |
100 | skb->protocol = inner_mode->afinfo->eth_proto; |
101 | return inner_mode->input2(x, skb); |
102 | } |
103 | EXPORT_SYMBOL(xfrm_prepare_input); |
104 | |
105 | int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi, int encap_type) |
106 | { |
107 | struct net *net = dev_net(skb->dev); |
108 | int err; |
109 | __be32 seq; |
110 | struct xfrm_state *x; |
111 | xfrm_address_t *daddr; |
112 | struct xfrm_mode *inner_mode; |
113 | unsigned int family; |
114 | int decaps = 0; |
115 | int async = 0; |
116 | |
117 | /* A negative encap_type indicates async resumption. */ |
118 | if (encap_type < 0) { |
119 | async = 1; |
120 | x = xfrm_input_state(skb); |
121 | seq = XFRM_SKB_CB(skb)->seq.input; |
122 | goto resume; |
123 | } |
124 | |
125 | /* Allocate new secpath or COW existing one. */ |
126 | if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) { |
127 | struct sec_path *sp; |
128 | |
129 | sp = secpath_dup(skb->sp); |
130 | if (!sp) { |
131 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR); |
132 | goto drop; |
133 | } |
134 | if (skb->sp) |
135 | secpath_put(skb->sp); |
136 | skb->sp = sp; |
137 | } |
138 | |
139 | daddr = (xfrm_address_t *)(skb_network_header(skb) + |
140 | XFRM_SPI_SKB_CB(skb)->daddroff); |
141 | family = XFRM_SPI_SKB_CB(skb)->family; |
142 | |
143 | seq = 0; |
144 | if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) { |
145 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
146 | goto drop; |
147 | } |
148 | |
149 | do { |
150 | if (skb->sp->len == XFRM_MAX_DEPTH) { |
151 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR); |
152 | goto drop; |
153 | } |
154 | |
155 | x = xfrm_state_lookup(net, skb->mark, daddr, spi, nexthdr, family); |
156 | if (x == NULL) { |
157 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES); |
158 | xfrm_audit_state_notfound(skb, family, spi, seq); |
159 | goto drop; |
160 | } |
161 | |
162 | skb->sp->xvec[skb->sp->len++] = x; |
163 | |
164 | spin_lock(&x->lock); |
165 | if (unlikely(x->km.state != XFRM_STATE_VALID)) { |
166 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEINVALID); |
167 | goto drop_unlock; |
168 | } |
169 | |
170 | if ((x->encap ? x->encap->encap_type : 0) != encap_type) { |
171 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH); |
172 | goto drop_unlock; |
173 | } |
174 | |
175 | if (x->props.replay_window && xfrm_replay_check(x, skb, seq)) { |
176 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR); |
177 | goto drop_unlock; |
178 | } |
179 | |
180 | if (xfrm_state_check_expire(x)) { |
181 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED); |
182 | goto drop_unlock; |
183 | } |
184 | |
185 | spin_unlock(&x->lock); |
186 | |
187 | XFRM_SKB_CB(skb)->seq.input = seq; |
188 | |
189 | nexthdr = x->type->input(x, skb); |
190 | |
191 | if (nexthdr == -EINPROGRESS) |
192 | return 0; |
193 | |
194 | resume: |
195 | spin_lock(&x->lock); |
196 | if (nexthdr <= 0) { |
197 | if (nexthdr == -EBADMSG) { |
198 | xfrm_audit_state_icvfail(x, skb, |
199 | x->type->proto); |
200 | x->stats.integrity_failed++; |
201 | } |
202 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR); |
203 | goto drop_unlock; |
204 | } |
205 | |
206 | /* only the first xfrm gets the encap type */ |
207 | encap_type = 0; |
208 | |
209 | if (x->props.replay_window) |
210 | xfrm_replay_advance(x, seq); |
211 | |
212 | x->curlft.bytes += skb->len; |
213 | x->curlft.packets++; |
214 | |
215 | spin_unlock(&x->lock); |
216 | |
217 | XFRM_MODE_SKB_CB(skb)->protocol = nexthdr; |
218 | |
219 | inner_mode = x->inner_mode; |
220 | |
221 | if (x->sel.family == AF_UNSPEC) { |
222 | inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol); |
223 | if (inner_mode == NULL) |
224 | goto drop; |
225 | } |
226 | |
227 | if (inner_mode->input(x, skb)) { |
228 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR); |
229 | goto drop; |
230 | } |
231 | |
232 | if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) { |
233 | decaps = 1; |
234 | break; |
235 | } |
236 | |
237 | /* |
238 | * We need the inner address. However, we only get here for |
239 | * transport mode so the outer address is identical. |
240 | */ |
241 | daddr = &x->id.daddr; |
242 | family = x->outer_mode->afinfo->family; |
243 | |
244 | err = xfrm_parse_spi(skb, nexthdr, &spi, &seq); |
245 | if (err < 0) { |
246 | XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR); |
247 | goto drop; |
248 | } |
249 | } while (!err); |
250 | |
251 | nf_reset(skb); |
252 | |
253 | if (decaps) { |
254 | skb_dst_drop(skb); |
255 | netif_rx(skb); |
256 | return 0; |
257 | } else { |
258 | return x->inner_mode->afinfo->transport_finish(skb, async); |
259 | } |
260 | |
261 | drop_unlock: |
262 | spin_unlock(&x->lock); |
263 | drop: |
264 | kfree_skb(skb); |
265 | return 0; |
266 | } |
267 | EXPORT_SYMBOL(xfrm_input); |
268 | |
269 | int xfrm_input_resume(struct sk_buff *skb, int nexthdr) |
270 | { |
271 | return xfrm_input(skb, nexthdr, 0, -1); |
272 | } |
273 | EXPORT_SYMBOL(xfrm_input_resume); |
274 | |
275 | void __init xfrm_input_init(void) |
276 | { |
277 | secpath_cachep = kmem_cache_create("secpath_cache", |
278 | sizeof(struct sec_path), |
279 | 0, SLAB_HWCACHE_ALIGN|SLAB_PANIC, |
280 | NULL); |
281 | } |
282 |
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