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Linux/net/xfrm/xfrm_input.c

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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         __be32 seq_hi;
111         struct xfrm_state *x;
112         xfrm_address_t *daddr;
113         struct xfrm_mode *inner_mode;
114         unsigned int family;
115         int decaps = 0;
116         int async = 0;
117 
118         /* A negative encap_type indicates async resumption. */
119         if (encap_type < 0) {
120                 async = 1;
121                 x = xfrm_input_state(skb);
122                 seq = XFRM_SKB_CB(skb)->seq.input.low;
123                 goto resume;
124         }
125 
126         /* Allocate new secpath or COW existing one. */
127         if (!skb->sp || atomic_read(&skb->sp->refcnt) != 1) {
128                 struct sec_path *sp;
129 
130                 sp = secpath_dup(skb->sp);
131                 if (!sp) {
132                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINERROR);
133                         goto drop;
134                 }
135                 if (skb->sp)
136                         secpath_put(skb->sp);
137                 skb->sp = sp;
138         }
139 
140         daddr = (xfrm_address_t *)(skb_network_header(skb) +
141                                    XFRM_SPI_SKB_CB(skb)->daddroff);
142         family = XFRM_SPI_SKB_CB(skb)->family;
143 
144         seq = 0;
145         if (!spi && (err = xfrm_parse_spi(skb, nexthdr, &spi, &seq)) != 0) {
146                 XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
147                 goto drop;
148         }
149 
150         do {
151                 if (skb->sp->len == XFRM_MAX_DEPTH) {
152                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINBUFFERERROR);
153                         goto drop;
154                 }
155 
156                 x = xfrm_state_lookup(net, skb->mark, daddr, spi, nexthdr, family);
157                 if (x == NULL) {
158                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINNOSTATES);
159                         xfrm_audit_state_notfound(skb, family, spi, seq);
160                         goto drop;
161                 }
162 
163                 skb->sp->xvec[skb->sp->len++] = x;
164 
165                 spin_lock(&x->lock);
166                 if (unlikely(x->km.state != XFRM_STATE_VALID)) {
167                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEINVALID);
168                         goto drop_unlock;
169                 }
170 
171                 if ((x->encap ? x->encap->encap_type : 0) != encap_type) {
172                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMISMATCH);
173                         goto drop_unlock;
174                 }
175 
176                 if (x->repl->check(x, skb, seq)) {
177                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
178                         goto drop_unlock;
179                 }
180 
181                 if (xfrm_state_check_expire(x)) {
182                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEEXPIRED);
183                         goto drop_unlock;
184                 }
185 
186                 spin_unlock(&x->lock);
187 
188                 seq_hi = htonl(xfrm_replay_seqhi(x, seq));
189 
190                 XFRM_SKB_CB(skb)->seq.input.low = seq;
191                 XFRM_SKB_CB(skb)->seq.input.hi = seq_hi;
192 
193                 skb_dst_force(skb);
194 
195                 nexthdr = x->type->input(x, skb);
196 
197                 if (nexthdr == -EINPROGRESS)
198                         return 0;
199 
200 resume:
201                 spin_lock(&x->lock);
202                 if (nexthdr <= 0) {
203                         if (nexthdr == -EBADMSG) {
204                                 xfrm_audit_state_icvfail(x, skb,
205                                                          x->type->proto);
206                                 x->stats.integrity_failed++;
207                         }
208                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEPROTOERROR);
209                         goto drop_unlock;
210                 }
211 
212                 /* only the first xfrm gets the encap type */
213                 encap_type = 0;
214 
215                 if (async && x->repl->recheck(x, skb, seq)) {
216                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATESEQERROR);
217                         goto drop_unlock;
218                 }
219 
220                 x->repl->advance(x, seq);
221 
222                 x->curlft.bytes += skb->len;
223                 x->curlft.packets++;
224 
225                 spin_unlock(&x->lock);
226 
227                 XFRM_MODE_SKB_CB(skb)->protocol = nexthdr;
228 
229                 inner_mode = x->inner_mode;
230 
231                 if (x->sel.family == AF_UNSPEC) {
232                         inner_mode = xfrm_ip2inner_mode(x, XFRM_MODE_SKB_CB(skb)->protocol);
233                         if (inner_mode == NULL)
234                                 goto drop;
235                 }
236 
237                 if (inner_mode->input(x, skb)) {
238                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINSTATEMODEERROR);
239                         goto drop;
240                 }
241 
242                 if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
243                         decaps = 1;
244                         break;
245                 }
246 
247                 /*
248                  * We need the inner address.  However, we only get here for
249                  * transport mode so the outer address is identical.
250                  */
251                 daddr = &x->id.daddr;
252                 family = x->outer_mode->afinfo->family;
253 
254                 err = xfrm_parse_spi(skb, nexthdr, &spi, &seq);
255                 if (err < 0) {
256                         XFRM_INC_STATS(net, LINUX_MIB_XFRMINHDRERROR);
257                         goto drop;
258                 }
259         } while (!err);
260 
261         nf_reset(skb);
262 
263         if (decaps) {
264                 skb_dst_drop(skb);
265                 netif_rx(skb);
266                 return 0;
267         } else {
268                 return x->inner_mode->afinfo->transport_finish(skb, async);
269         }
270 
271 drop_unlock:
272         spin_unlock(&x->lock);
273 drop:
274         kfree_skb(skb);
275         return 0;
276 }
277 EXPORT_SYMBOL(xfrm_input);
278 
279 int xfrm_input_resume(struct sk_buff *skb, int nexthdr)
280 {
281         return xfrm_input(skb, nexthdr, 0, -1);
282 }
283 EXPORT_SYMBOL(xfrm_input_resume);
284 
285 void __init xfrm_input_init(void)
286 {
287         secpath_cachep = kmem_cache_create("secpath_cache",
288                                            sizeof(struct sec_path),
289                                            0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,
290                                            NULL);
291 }
292 

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