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1 /* SCTP kernel implementation 1 /* SCTP kernel implementation
2 * Copyright (c) 1999-2000 Cisco, Inc. 2 * Copyright (c) 1999-2000 Cisco, Inc.
3 * Copyright (c) 1999-2001 Motorola, Inc. 3 * Copyright (c) 1999-2001 Motorola, Inc.
4 * Copyright (c) 2001-2003 International Busin 4 * Copyright (c) 2001-2003 International Business Machines, Corp.
5 * Copyright (c) 2001 Intel Corp. 5 * Copyright (c) 2001 Intel Corp.
6 * Copyright (c) 2001 Nokia, Inc. 6 * Copyright (c) 2001 Nokia, Inc.
7 * Copyright (c) 2001 La Monte H.P. Yarroll 7 * Copyright (c) 2001 La Monte H.P. Yarroll
8 * 8 *
9 * This file is part of the SCTP kernel implem 9 * This file is part of the SCTP kernel implementation
10 * 10 *
11 * These functions handle all input from the I 11 * These functions handle all input from the IP layer into SCTP.
12 * 12 *
13 * This SCTP implementation is free software; 13 * This SCTP implementation is free software;
14 * you can redistribute it and/or modify it un 14 * you can redistribute it and/or modify it under the terms of
15 * the GNU General Public License as published 15 * the GNU General Public License as published by
16 * the Free Software Foundation; either versio 16 * the Free Software Foundation; either version 2, or (at your option)
17 * any later version. 17 * any later version.
18 * 18 *
19 * This SCTP implementation is distributed in 19 * This SCTP implementation is distributed in the hope that it
20 * will be useful, but WITHOUT ANY WARRANTY; w 20 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
21 * ************************ 21 * ************************
22 * warranty of MERCHANTABILITY or FITNESS FOR 22 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
23 * See the GNU General Public License for more 23 * See the GNU General Public License for more details.
24 * 24 *
25 * You should have received a copy of the GNU 25 * You should have received a copy of the GNU General Public License
26 * along with GNU CC; see the file COPYING. I 26 * along with GNU CC; see the file COPYING. If not, write to
27 * the Free Software Foundation, 59 Temple Pla 27 * the Free Software Foundation, 59 Temple Place - Suite 330,
28 * Boston, MA 02111-1307, USA. 28 * Boston, MA 02111-1307, USA.
29 * 29 *
30 * Please send any bug reports or fixes you ma 30 * Please send any bug reports or fixes you make to the
31 * email address(es): 31 * email address(es):
32 * lksctp developers <lksctp-developers@lis 32 * lksctp developers <lksctp-developers@lists.sourceforge.net>
33 * 33 *
34 * Or submit a bug report through the followin 34 * Or submit a bug report through the following website:
35 * http://www.sf.net/projects/lksctp 35 * http://www.sf.net/projects/lksctp
36 * 36 *
37 * Written or modified by: 37 * Written or modified by:
38 * La Monte H.P. Yarroll <piggy@acm.org> 38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Karl Knutson <karl@athena.chicago.il.us> 39 * Karl Knutson <karl@athena.chicago.il.us>
40 * Xingang Guo <xingang.guo@intel.com> 40 * Xingang Guo <xingang.guo@intel.com>
41 * Jon Grimm <jgrimm@us.ibm.com> 41 * Jon Grimm <jgrimm@us.ibm.com>
42 * Hui Huang <hui.huang@nokia.com> 42 * Hui Huang <hui.huang@nokia.com>
43 * Daisy Chang <daisyc@us.ibm.com> 43 * Daisy Chang <daisyc@us.ibm.com>
44 * Sridhar Samudrala <sri@us.ibm.com> 44 * Sridhar Samudrala <sri@us.ibm.com>
45 * Ardelle Fan <ardelle.fan@intel.com> 45 * Ardelle Fan <ardelle.fan@intel.com>
46 * 46 *
47 * Any bugs reported given to us we will try t 47 * Any bugs reported given to us we will try to fix... any fixes shared will
48 * be incorporated into the next SCTP release. 48 * be incorporated into the next SCTP release.
49 */ 49 */
50 50
51 #include <linux/types.h> 51 #include <linux/types.h>
52 #include <linux/list.h> /* For struct list_hea 52 #include <linux/list.h> /* For struct list_head */
53 #include <linux/socket.h> 53 #include <linux/socket.h>
54 #include <linux/ip.h> 54 #include <linux/ip.h>
55 #include <linux/time.h> /* For struct timeval 55 #include <linux/time.h> /* For struct timeval */
56 #include <net/ip.h> 56 #include <net/ip.h>
57 #include <net/icmp.h> 57 #include <net/icmp.h>
58 #include <net/snmp.h> 58 #include <net/snmp.h>
59 #include <net/sock.h> 59 #include <net/sock.h>
60 #include <net/xfrm.h> 60 #include <net/xfrm.h>
61 #include <net/sctp/sctp.h> 61 #include <net/sctp/sctp.h>
62 #include <net/sctp/sm.h> 62 #include <net/sctp/sm.h>
63 #include <net/sctp/checksum.h> 63 #include <net/sctp/checksum.h>
>> 64 #include <net/net_namespace.h>
64 65
65 /* Forward declarations for internal helpers. 66 /* Forward declarations for internal helpers. */
66 static int sctp_rcv_ootb(struct sk_buff *); 67 static int sctp_rcv_ootb(struct sk_buff *);
67 static struct sctp_association *__sctp_rcv_loo 68 static struct sctp_association *__sctp_rcv_lookup(struct sk_buff *skb,
68 const un 69 const union sctp_addr *laddr,
69 const un 70 const union sctp_addr *paddr,
70 struct s 71 struct sctp_transport **transportp);
71 static struct sctp_endpoint *__sctp_rcv_lookup 72 static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(const union sctp_addr *laddr);
72 static struct sctp_association *__sctp_lookup_ 73 static struct sctp_association *__sctp_lookup_association(
73 const 74 const union sctp_addr *local,
74 const 75 const union sctp_addr *peer,
75 struct 76 struct sctp_transport **pt);
76 77
77 static void sctp_add_backlog(struct sock *sk, 78 static void sctp_add_backlog(struct sock *sk, struct sk_buff *skb);
78 79
79 80
80 /* Calculate the SCTP checksum of an SCTP pack 81 /* Calculate the SCTP checksum of an SCTP packet. */
81 static inline int sctp_rcv_checksum(struct sk_ 82 static inline int sctp_rcv_checksum(struct sk_buff *skb)
82 { 83 {
83 struct sk_buff *list = skb_shinfo(skb) <<
84 struct sctphdr *sh = sctp_hdr(skb); 84 struct sctphdr *sh = sctp_hdr(skb);
85 __u32 cmp = ntohl(sh->checksum); !! 85 __le32 cmp = sh->checksum;
86 __u32 val = sctp_start_cksum((__u8 *)s !! 86 struct sk_buff *list;
>> 87 __le32 val;
>> 88 __u32 tmp = sctp_start_cksum((__u8 *)sh, skb_headlen(skb));
>> 89
>> 90 skb_walk_frags(skb, list)
>> 91 tmp = sctp_update_cksum((__u8 *)list->data, skb_headlen(list),
>> 92 tmp);
87 93
88 for (; list; list = list->next) !! 94 val = sctp_end_cksum(tmp);
89 val = sctp_update_cksum((__u8 <<
90 val); <<
91 <<
92 val = sctp_end_cksum(val); <<
93 95
94 if (val != cmp) { 96 if (val != cmp) {
95 /* CRC failure, dump it. */ 97 /* CRC failure, dump it. */
96 SCTP_INC_STATS_BH(SCTP_MIB_CHE 98 SCTP_INC_STATS_BH(SCTP_MIB_CHECKSUMERRORS);
97 return -1; 99 return -1;
98 } 100 }
99 return 0; 101 return 0;
100 } 102 }
101 103
102 struct sctp_input_cb { 104 struct sctp_input_cb {
103 union { 105 union {
104 struct inet_skb_parm h4; 106 struct inet_skb_parm h4;
105 #if defined(CONFIG_IPV6) || defined (CONFIG_IP 107 #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
106 struct inet6_skb_parm h6; 108 struct inet6_skb_parm h6;
107 #endif 109 #endif
108 } header; 110 } header;
109 struct sctp_chunk *chunk; 111 struct sctp_chunk *chunk;
110 }; 112 };
111 #define SCTP_INPUT_CB(__skb) ((struct sctp_ 113 #define SCTP_INPUT_CB(__skb) ((struct sctp_input_cb *)&((__skb)->cb[0]))
112 114
113 /* 115 /*
114 * This is the routine which IP calls when rec 116 * This is the routine which IP calls when receiving an SCTP packet.
115 */ 117 */
116 int sctp_rcv(struct sk_buff *skb) 118 int sctp_rcv(struct sk_buff *skb)
117 { 119 {
118 struct sock *sk; 120 struct sock *sk;
119 struct sctp_association *asoc; 121 struct sctp_association *asoc;
120 struct sctp_endpoint *ep = NULL; 122 struct sctp_endpoint *ep = NULL;
121 struct sctp_ep_common *rcvr; 123 struct sctp_ep_common *rcvr;
122 struct sctp_transport *transport = NUL 124 struct sctp_transport *transport = NULL;
123 struct sctp_chunk *chunk; 125 struct sctp_chunk *chunk;
124 struct sctphdr *sh; 126 struct sctphdr *sh;
125 union sctp_addr src; 127 union sctp_addr src;
126 union sctp_addr dest; 128 union sctp_addr dest;
127 int family; 129 int family;
128 struct sctp_af *af; 130 struct sctp_af *af;
129 131
130 if (skb->pkt_type!=PACKET_HOST) 132 if (skb->pkt_type!=PACKET_HOST)
131 goto discard_it; 133 goto discard_it;
132 134
133 SCTP_INC_STATS_BH(SCTP_MIB_INSCTPPACKS 135 SCTP_INC_STATS_BH(SCTP_MIB_INSCTPPACKS);
134 136
135 if (skb_linearize(skb)) 137 if (skb_linearize(skb))
136 goto discard_it; 138 goto discard_it;
137 139
138 sh = sctp_hdr(skb); 140 sh = sctp_hdr(skb);
139 141
140 /* Pull up the IP and SCTP headers. */ 142 /* Pull up the IP and SCTP headers. */
141 __skb_pull(skb, skb_transport_offset(s 143 __skb_pull(skb, skb_transport_offset(skb));
142 if (skb->len < sizeof(struct sctphdr)) 144 if (skb->len < sizeof(struct sctphdr))
143 goto discard_it; 145 goto discard_it;
144 if (!skb_csum_unnecessary(skb) && sctp !! 146 if (!sctp_checksum_disable && !skb_csum_unnecessary(skb) &&
>> 147 sctp_rcv_checksum(skb) < 0)
145 goto discard_it; 148 goto discard_it;
146 149
147 skb_pull(skb, sizeof(struct sctphdr)); 150 skb_pull(skb, sizeof(struct sctphdr));
148 151
149 /* Make sure we at least have chunk he 152 /* Make sure we at least have chunk headers worth of data left. */
150 if (skb->len < sizeof(struct sctp_chun 153 if (skb->len < sizeof(struct sctp_chunkhdr))
151 goto discard_it; 154 goto discard_it;
152 155
153 family = ipver2af(ip_hdr(skb)->version 156 family = ipver2af(ip_hdr(skb)->version);
154 af = sctp_get_af_specific(family); 157 af = sctp_get_af_specific(family);
155 if (unlikely(!af)) 158 if (unlikely(!af))
156 goto discard_it; 159 goto discard_it;
157 160
158 /* Initialize local addresses for look 161 /* Initialize local addresses for lookups. */
159 af->from_skb(&src, skb, 1); 162 af->from_skb(&src, skb, 1);
160 af->from_skb(&dest, skb, 0); 163 af->from_skb(&dest, skb, 0);
161 164
162 /* If the packet is to or from a non-u 165 /* If the packet is to or from a non-unicast address,
163 * silently discard the packet. 166 * silently discard the packet.
164 * 167 *
165 * This is not clearly defined in the 168 * This is not clearly defined in the RFC except in section
166 * 8.4 - OOTB handling. However, base 169 * 8.4 - OOTB handling. However, based on the book "Stream Control
167 * Transmission Protocol" 2.1, "It is 170 * Transmission Protocol" 2.1, "It is important to note that the
168 * IP address of an SCTP transport add 171 * IP address of an SCTP transport address must be a routable
169 * unicast address. In other words, I 172 * unicast address. In other words, IP multicast addresses and
170 * IP broadcast addresses cannot be us 173 * IP broadcast addresses cannot be used in an SCTP transport
171 * address." 174 * address."
172 */ 175 */
173 if (!af->addr_valid(&src, NULL, skb) | 176 if (!af->addr_valid(&src, NULL, skb) ||
174 !af->addr_valid(&dest, NULL, skb)) 177 !af->addr_valid(&dest, NULL, skb))
175 goto discard_it; 178 goto discard_it;
176 179
177 asoc = __sctp_rcv_lookup(skb, &src, &d 180 asoc = __sctp_rcv_lookup(skb, &src, &dest, &transport);
178 181
179 if (!asoc) 182 if (!asoc)
180 ep = __sctp_rcv_lookup_endpoin 183 ep = __sctp_rcv_lookup_endpoint(&dest);
181 184
182 /* Retrieve the common input handling 185 /* Retrieve the common input handling substructure. */
183 rcvr = asoc ? &asoc->base : &ep->base; 186 rcvr = asoc ? &asoc->base : &ep->base;
184 sk = rcvr->sk; 187 sk = rcvr->sk;
185 188
186 /* 189 /*
187 * If a frame arrives on an interface 190 * If a frame arrives on an interface and the receiving socket is
188 * bound to another interface, via SO_ 191 * bound to another interface, via SO_BINDTODEVICE, treat it as OOTB
189 */ 192 */
190 if (sk->sk_bound_dev_if && (sk->sk_bou 193 if (sk->sk_bound_dev_if && (sk->sk_bound_dev_if != af->skb_iif(skb)))
191 { 194 {
192 if (asoc) { 195 if (asoc) {
193 sctp_association_put(a 196 sctp_association_put(asoc);
194 asoc = NULL; 197 asoc = NULL;
195 } else { 198 } else {
196 sctp_endpoint_put(ep); 199 sctp_endpoint_put(ep);
197 ep = NULL; 200 ep = NULL;
198 } 201 }
199 sk = sctp_get_ctl_sock(); 202 sk = sctp_get_ctl_sock();
200 ep = sctp_sk(sk)->ep; 203 ep = sctp_sk(sk)->ep;
201 sctp_endpoint_hold(ep); 204 sctp_endpoint_hold(ep);
202 rcvr = &ep->base; 205 rcvr = &ep->base;
203 } 206 }
204 207
205 /* 208 /*
206 * RFC 2960, 8.4 - Handle "Out of the 209 * RFC 2960, 8.4 - Handle "Out of the blue" Packets.
207 * An SCTP packet is called an "out of 210 * An SCTP packet is called an "out of the blue" (OOTB)
208 * packet if it is correctly formed, i 211 * packet if it is correctly formed, i.e., passed the
209 * receiver's checksum check, but the 212 * receiver's checksum check, but the receiver is not
210 * able to identify the association to 213 * able to identify the association to which this
211 * packet belongs. 214 * packet belongs.
212 */ 215 */
213 if (!asoc) { 216 if (!asoc) {
214 if (sctp_rcv_ootb(skb)) { 217 if (sctp_rcv_ootb(skb)) {
215 SCTP_INC_STATS_BH(SCTP 218 SCTP_INC_STATS_BH(SCTP_MIB_OUTOFBLUES);
216 goto discard_release; 219 goto discard_release;
217 } 220 }
218 } 221 }
219 222
220 if (!xfrm_policy_check(sk, XFRM_POLICY 223 if (!xfrm_policy_check(sk, XFRM_POLICY_IN, skb, family))
221 goto discard_release; 224 goto discard_release;
222 nf_reset(skb); 225 nf_reset(skb);
223 226
224 if (sk_filter(sk, skb)) 227 if (sk_filter(sk, skb))
225 goto discard_release; 228 goto discard_release;
226 229
227 /* Create an SCTP packet structure. */ 230 /* Create an SCTP packet structure. */
228 chunk = sctp_chunkify(skb, asoc, sk); 231 chunk = sctp_chunkify(skb, asoc, sk);
229 if (!chunk) 232 if (!chunk)
230 goto discard_release; 233 goto discard_release;
231 SCTP_INPUT_CB(skb)->chunk = chunk; 234 SCTP_INPUT_CB(skb)->chunk = chunk;
232 235
233 /* Remember what endpoint is to handle 236 /* Remember what endpoint is to handle this packet. */
234 chunk->rcvr = rcvr; 237 chunk->rcvr = rcvr;
235 238
236 /* Remember the SCTP header. */ 239 /* Remember the SCTP header. */
237 chunk->sctp_hdr = sh; 240 chunk->sctp_hdr = sh;
238 241
239 /* Set the source and destination addr 242 /* Set the source and destination addresses of the incoming chunk. */
240 sctp_init_addrs(chunk, &src, &dest); 243 sctp_init_addrs(chunk, &src, &dest);
241 244
242 /* Remember where we came from. */ 245 /* Remember where we came from. */
243 chunk->transport = transport; 246 chunk->transport = transport;
244 247
245 /* Acquire access to the sock lock. No 248 /* Acquire access to the sock lock. Note: We are safe from other
246 * bottom halves on this lock, but a u 249 * bottom halves on this lock, but a user may be in the lock too,
247 * so check if it is busy. 250 * so check if it is busy.
248 */ 251 */
249 sctp_bh_lock_sock(sk); 252 sctp_bh_lock_sock(sk);
250 253
>> 254 if (sk != rcvr->sk) {
>> 255 /* Our cached sk is different from the rcvr->sk. This is
>> 256 * because migrate()/accept() may have moved the association
>> 257 * to a new socket and released all the sockets. So now we
>> 258 * are holding a lock on the old socket while the user may
>> 259 * be doing something with the new socket. Switch our veiw
>> 260 * of the current sk.
>> 261 */
>> 262 sctp_bh_unlock_sock(sk);
>> 263 sk = rcvr->sk;
>> 264 sctp_bh_lock_sock(sk);
>> 265 }
>> 266
251 if (sock_owned_by_user(sk)) { 267 if (sock_owned_by_user(sk)) {
252 SCTP_INC_STATS_BH(SCTP_MIB_IN_ 268 SCTP_INC_STATS_BH(SCTP_MIB_IN_PKT_BACKLOG);
253 sctp_add_backlog(sk, skb); 269 sctp_add_backlog(sk, skb);
254 } else { 270 } else {
255 SCTP_INC_STATS_BH(SCTP_MIB_IN_ 271 SCTP_INC_STATS_BH(SCTP_MIB_IN_PKT_SOFTIRQ);
256 sctp_inq_push(&chunk->rcvr->in 272 sctp_inq_push(&chunk->rcvr->inqueue, chunk);
257 } 273 }
258 274
259 sctp_bh_unlock_sock(sk); 275 sctp_bh_unlock_sock(sk);
260 276
261 /* Release the asoc/ep ref we took in 277 /* Release the asoc/ep ref we took in the lookup calls. */
262 if (asoc) 278 if (asoc)
263 sctp_association_put(asoc); 279 sctp_association_put(asoc);
264 else 280 else
265 sctp_endpoint_put(ep); 281 sctp_endpoint_put(ep);
266 282
267 return 0; 283 return 0;
268 284
269 discard_it: 285 discard_it:
270 SCTP_INC_STATS_BH(SCTP_MIB_IN_PKT_DISC 286 SCTP_INC_STATS_BH(SCTP_MIB_IN_PKT_DISCARDS);
271 kfree_skb(skb); 287 kfree_skb(skb);
272 return 0; 288 return 0;
273 289
274 discard_release: 290 discard_release:
275 /* Release the asoc/ep ref we took in 291 /* Release the asoc/ep ref we took in the lookup calls. */
276 if (asoc) 292 if (asoc)
277 sctp_association_put(asoc); 293 sctp_association_put(asoc);
278 else 294 else
279 sctp_endpoint_put(ep); 295 sctp_endpoint_put(ep);
280 296
281 goto discard_it; 297 goto discard_it;
282 } 298 }
283 299
284 /* Process the backlog queue of the socket. E 300 /* Process the backlog queue of the socket. Every skb on
285 * the backlog holds a ref on an association o 301 * the backlog holds a ref on an association or endpoint.
286 * We hold this ref throughout the state machi 302 * We hold this ref throughout the state machine to make
287 * sure that the structure we need is still ar 303 * sure that the structure we need is still around.
288 */ 304 */
289 int sctp_backlog_rcv(struct sock *sk, struct s 305 int sctp_backlog_rcv(struct sock *sk, struct sk_buff *skb)
290 { 306 {
291 struct sctp_chunk *chunk = SCTP_INPUT_ 307 struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;
292 struct sctp_inq *inqueue = &chunk->rcv 308 struct sctp_inq *inqueue = &chunk->rcvr->inqueue;
293 struct sctp_ep_common *rcvr = NULL; 309 struct sctp_ep_common *rcvr = NULL;
294 int backloged = 0; 310 int backloged = 0;
295 311
296 rcvr = chunk->rcvr; 312 rcvr = chunk->rcvr;
297 313
298 /* If the rcvr is dead then the associ 314 /* If the rcvr is dead then the association or endpoint
299 * has been deleted and we can safely 315 * has been deleted and we can safely drop the chunk
300 * and refs that we are holding. 316 * and refs that we are holding.
301 */ 317 */
302 if (rcvr->dead) { 318 if (rcvr->dead) {
303 sctp_chunk_free(chunk); 319 sctp_chunk_free(chunk);
304 goto done; 320 goto done;
305 } 321 }
306 322
307 if (unlikely(rcvr->sk != sk)) { 323 if (unlikely(rcvr->sk != sk)) {
308 /* In this case, the associati 324 /* In this case, the association moved from one socket to
309 * another. We are currently 325 * another. We are currently sitting on the backlog of the
310 * old socket, so we need to m 326 * old socket, so we need to move.
311 * However, since we are here 327 * However, since we are here in the process context we
312 * need to take make sure that 328 * need to take make sure that the user doesn't own
313 * the new socket when we proc 329 * the new socket when we process the packet.
314 * If the new socket is user-o 330 * If the new socket is user-owned, queue the chunk to the
315 * backlog of the new socket w 331 * backlog of the new socket without dropping any refs.
316 * Otherwise, we can safely pu 332 * Otherwise, we can safely push the chunk on the inqueue.
317 */ 333 */
318 334
319 sk = rcvr->sk; 335 sk = rcvr->sk;
320 sctp_bh_lock_sock(sk); 336 sctp_bh_lock_sock(sk);
321 337
322 if (sock_owned_by_user(sk)) { 338 if (sock_owned_by_user(sk)) {
323 sk_add_backlog(sk, skb 339 sk_add_backlog(sk, skb);
324 backloged = 1; 340 backloged = 1;
325 } else 341 } else
326 sctp_inq_push(inqueue, 342 sctp_inq_push(inqueue, chunk);
327 343
328 sctp_bh_unlock_sock(sk); 344 sctp_bh_unlock_sock(sk);
329 345
330 /* If the chunk was backloged 346 /* If the chunk was backloged again, don't drop refs */
331 if (backloged) 347 if (backloged)
332 return 0; 348 return 0;
333 } else { 349 } else {
334 sctp_inq_push(inqueue, chunk); 350 sctp_inq_push(inqueue, chunk);
335 } 351 }
336 352
337 done: 353 done:
338 /* Release the refs we took in sctp_ad 354 /* Release the refs we took in sctp_add_backlog */
339 if (SCTP_EP_TYPE_ASSOCIATION == rcvr-> 355 if (SCTP_EP_TYPE_ASSOCIATION == rcvr->type)
340 sctp_association_put(sctp_asso 356 sctp_association_put(sctp_assoc(rcvr));
341 else if (SCTP_EP_TYPE_SOCKET == rcvr-> 357 else if (SCTP_EP_TYPE_SOCKET == rcvr->type)
342 sctp_endpoint_put(sctp_ep(rcvr 358 sctp_endpoint_put(sctp_ep(rcvr));
343 else 359 else
344 BUG(); 360 BUG();
345 361
346 return 0; 362 return 0;
347 } 363 }
348 364
349 static void sctp_add_backlog(struct sock *sk, 365 static void sctp_add_backlog(struct sock *sk, struct sk_buff *skb)
350 { 366 {
351 struct sctp_chunk *chunk = SCTP_INPUT_ 367 struct sctp_chunk *chunk = SCTP_INPUT_CB(skb)->chunk;
352 struct sctp_ep_common *rcvr = chunk->r 368 struct sctp_ep_common *rcvr = chunk->rcvr;
353 369
354 /* Hold the assoc/ep while hanging on 370 /* Hold the assoc/ep while hanging on the backlog queue.
355 * This way, we know structures we nee 371 * This way, we know structures we need will not disappear from us
356 */ 372 */
357 if (SCTP_EP_TYPE_ASSOCIATION == rcvr-> 373 if (SCTP_EP_TYPE_ASSOCIATION == rcvr->type)
358 sctp_association_hold(sctp_ass 374 sctp_association_hold(sctp_assoc(rcvr));
359 else if (SCTP_EP_TYPE_SOCKET == rcvr-> 375 else if (SCTP_EP_TYPE_SOCKET == rcvr->type)
360 sctp_endpoint_hold(sctp_ep(rcv 376 sctp_endpoint_hold(sctp_ep(rcvr));
361 else 377 else
362 BUG(); 378 BUG();
363 379
364 sk_add_backlog(sk, skb); 380 sk_add_backlog(sk, skb);
365 } 381 }
366 382
367 /* Handle icmp frag needed error. */ 383 /* Handle icmp frag needed error. */
368 void sctp_icmp_frag_needed(struct sock *sk, st 384 void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
369 struct sctp_transpo 385 struct sctp_transport *t, __u32 pmtu)
370 { 386 {
371 if (!t || (t->pathmtu == pmtu)) !! 387 if (!t || (t->pathmtu <= pmtu))
372 return; 388 return;
373 389
374 if (sock_owned_by_user(sk)) { 390 if (sock_owned_by_user(sk)) {
375 asoc->pmtu_pending = 1; 391 asoc->pmtu_pending = 1;
376 t->pmtu_pending = 1; 392 t->pmtu_pending = 1;
377 return; 393 return;
378 } 394 }
379 395
380 if (t->param_flags & SPP_PMTUD_ENABLE) 396 if (t->param_flags & SPP_PMTUD_ENABLE) {
381 /* Update transports view of t 397 /* Update transports view of the MTU */
382 sctp_transport_update_pmtu(t, 398 sctp_transport_update_pmtu(t, pmtu);
383 399
384 /* Update association pmtu. */ 400 /* Update association pmtu. */
385 sctp_assoc_sync_pmtu(asoc); 401 sctp_assoc_sync_pmtu(asoc);
386 } 402 }
387 403
388 /* Retransmit with the new pmtu settin 404 /* Retransmit with the new pmtu setting.
389 * Normally, if PMTU discovery is disa 405 * Normally, if PMTU discovery is disabled, an ICMP Fragmentation
390 * Needed will never be sent, but if a 406 * Needed will never be sent, but if a message was sent before
391 * PMTU discovery was disabled that wa 407 * PMTU discovery was disabled that was larger than the PMTU, it
392 * would not be fragmented, so it must 408 * would not be fragmented, so it must be re-transmitted fragmented.
393 */ 409 */
394 sctp_retransmit(&asoc->outqueue, t, SC 410 sctp_retransmit(&asoc->outqueue, t, SCTP_RTXR_PMTUD);
395 } 411 }
396 412
397 /* 413 /*
398 * SCTP Implementer's Guide, 2.37 ICMP handlin 414 * SCTP Implementer's Guide, 2.37 ICMP handling procedures
399 * 415 *
400 * ICMP8) If the ICMP code is a "Unrecognized 416 * ICMP8) If the ICMP code is a "Unrecognized next header type encountered"
401 * or a "Protocol Unreachable" treat th 417 * or a "Protocol Unreachable" treat this message as an abort
402 * with the T bit set. 418 * with the T bit set.
403 * 419 *
404 * This function sends an event to the state m 420 * This function sends an event to the state machine, which will abort the
405 * association. 421 * association.
406 * 422 *
407 */ 423 */
408 void sctp_icmp_proto_unreachable(struct sock * 424 void sctp_icmp_proto_unreachable(struct sock *sk,
409 struct sctp_associa 425 struct sctp_association *asoc,
410 struct sctp_transpo 426 struct sctp_transport *t)
411 { 427 {
412 SCTP_DEBUG_PRINTK("%s\n", __FUNCTION_ !! 428 SCTP_DEBUG_PRINTK("%s\n", __func__);
413 429
414 sctp_do_sm(SCTP_EVENT_T_OTHER, 430 sctp_do_sm(SCTP_EVENT_T_OTHER,
415 SCTP_ST_OTHER(SCTP_EVENT_IC 431 SCTP_ST_OTHER(SCTP_EVENT_ICMP_PROTO_UNREACH),
416 asoc->state, asoc->ep, asoc 432 asoc->state, asoc->ep, asoc, t,
417 GFP_ATOMIC); 433 GFP_ATOMIC);
418 434
419 } 435 }
420 436
421 /* Common lookup code for icmp/icmpv6 error ha 437 /* Common lookup code for icmp/icmpv6 error handler. */
422 struct sock *sctp_err_lookup(int family, struc 438 struct sock *sctp_err_lookup(int family, struct sk_buff *skb,
423 struct sctphdr *s 439 struct sctphdr *sctphdr,
424 struct sctp_assoc 440 struct sctp_association **app,
425 struct sctp_trans 441 struct sctp_transport **tpp)
426 { 442 {
427 union sctp_addr saddr; 443 union sctp_addr saddr;
428 union sctp_addr daddr; 444 union sctp_addr daddr;
429 struct sctp_af *af; 445 struct sctp_af *af;
430 struct sock *sk = NULL; 446 struct sock *sk = NULL;
431 struct sctp_association *asoc; 447 struct sctp_association *asoc;
432 struct sctp_transport *transport = NUL 448 struct sctp_transport *transport = NULL;
>> 449 struct sctp_init_chunk *chunkhdr;
>> 450 __u32 vtag = ntohl(sctphdr->vtag);
>> 451 int len = skb->len - ((void *)sctphdr - (void *)skb->data);
433 452
434 *app = NULL; *tpp = NULL; 453 *app = NULL; *tpp = NULL;
435 454
436 af = sctp_get_af_specific(family); 455 af = sctp_get_af_specific(family);
437 if (unlikely(!af)) { 456 if (unlikely(!af)) {
438 return NULL; 457 return NULL;
439 } 458 }
440 459
441 /* Initialize local addresses for look 460 /* Initialize local addresses for lookups. */
442 af->from_skb(&saddr, skb, 1); 461 af->from_skb(&saddr, skb, 1);
443 af->from_skb(&daddr, skb, 0); 462 af->from_skb(&daddr, skb, 0);
444 463
445 /* Look for an association that matche 464 /* Look for an association that matches the incoming ICMP error
446 * packet. 465 * packet.
447 */ 466 */
448 asoc = __sctp_lookup_association(&sadd 467 asoc = __sctp_lookup_association(&saddr, &daddr, &transport);
449 if (!asoc) 468 if (!asoc)
450 return NULL; 469 return NULL;
451 470
452 sk = asoc->base.sk; 471 sk = asoc->base.sk;
453 472
454 if (ntohl(sctphdr->vtag) != asoc->c.pe !! 473 /* RFC 4960, Appendix C. ICMP Handling
455 ICMP_INC_STATS_BH(ICMP_MIB_INE !! 474 *
>> 475 * ICMP6) An implementation MUST validate that the Verification Tag
>> 476 * contained in the ICMP message matches the Verification Tag of
>> 477 * the peer. If the Verification Tag is not 0 and does NOT
>> 478 * match, discard the ICMP message. If it is 0 and the ICMP
>> 479 * message contains enough bytes to verify that the chunk type is
>> 480 * an INIT chunk and that the Initiate Tag matches the tag of the
>> 481 * peer, continue with ICMP7. If the ICMP message is too short
>> 482 * or the chunk type or the Initiate Tag does not match, silently
>> 483 * discard the packet.
>> 484 */
>> 485 if (vtag == 0) {
>> 486 chunkhdr = (struct sctp_init_chunk *)((void *)sctphdr
>> 487 + sizeof(struct sctphdr));
>> 488 if (len < sizeof(struct sctphdr) + sizeof(sctp_chunkhdr_t)
>> 489 + sizeof(__be32) ||
>> 490 chunkhdr->chunk_hdr.type != SCTP_CID_INIT ||
>> 491 ntohl(chunkhdr->init_hdr.init_tag) != asoc->c.my_vtag) {
>> 492 goto out;
>> 493 }
>> 494 } else if (vtag != asoc->c.peer_vtag) {
456 goto out; 495 goto out;
457 } 496 }
458 497
459 sctp_bh_lock_sock(sk); 498 sctp_bh_lock_sock(sk);
460 499
461 /* If too many ICMPs get dropped on bu 500 /* If too many ICMPs get dropped on busy
462 * servers this needs to be solved dif 501 * servers this needs to be solved differently.
463 */ 502 */
464 if (sock_owned_by_user(sk)) 503 if (sock_owned_by_user(sk))
465 NET_INC_STATS_BH(LINUX_MIB_LOC !! 504 NET_INC_STATS_BH(&init_net, LINUX_MIB_LOCKDROPPEDICMPS);
466 505
467 *app = asoc; 506 *app = asoc;
468 *tpp = transport; 507 *tpp = transport;
469 return sk; 508 return sk;
470 509
471 out: 510 out:
472 if (asoc) 511 if (asoc)
473 sctp_association_put(asoc); 512 sctp_association_put(asoc);
474 return NULL; 513 return NULL;
475 } 514 }
476 515
477 /* Common cleanup code for icmp/icmpv6 error h 516 /* Common cleanup code for icmp/icmpv6 error handler. */
478 void sctp_err_finish(struct sock *sk, struct s 517 void sctp_err_finish(struct sock *sk, struct sctp_association *asoc)
479 { 518 {
480 sctp_bh_unlock_sock(sk); 519 sctp_bh_unlock_sock(sk);
481 if (asoc) 520 if (asoc)
482 sctp_association_put(asoc); 521 sctp_association_put(asoc);
483 } 522 }
484 523
485 /* 524 /*
486 * This routine is called by the ICMP module w 525 * This routine is called by the ICMP module when it gets some
487 * sort of error condition. If err < 0 then t 526 * sort of error condition. If err < 0 then the socket should
488 * be closed and the error returned to the use 527 * be closed and the error returned to the user. If err > 0
489 * it's just the icmp type << 8 | icmp code. 528 * it's just the icmp type << 8 | icmp code. After adjustment
490 * header points to the first 8 bytes of the s 529 * header points to the first 8 bytes of the sctp header. We need
491 * to find the appropriate port. 530 * to find the appropriate port.
492 * 531 *
493 * The locking strategy used here is very "opt 532 * The locking strategy used here is very "optimistic". When
494 * someone else accesses the socket the ICMP i 533 * someone else accesses the socket the ICMP is just dropped
495 * and for some paths there is no check at all 534 * and for some paths there is no check at all.
496 * A more general error queue to queue errors 535 * A more general error queue to queue errors for later handling
497 * is probably better. 536 * is probably better.
498 * 537 *
499 */ 538 */
500 void sctp_v4_err(struct sk_buff *skb, __u32 in 539 void sctp_v4_err(struct sk_buff *skb, __u32 info)
501 { 540 {
502 struct iphdr *iph = (struct iphdr *)sk 541 struct iphdr *iph = (struct iphdr *)skb->data;
503 const int ihlen = iph->ihl * 4; 542 const int ihlen = iph->ihl * 4;
504 const int type = icmp_hdr(skb)->type; 543 const int type = icmp_hdr(skb)->type;
505 const int code = icmp_hdr(skb)->code; 544 const int code = icmp_hdr(skb)->code;
506 struct sock *sk; 545 struct sock *sk;
507 struct sctp_association *asoc = NULL; 546 struct sctp_association *asoc = NULL;
508 struct sctp_transport *transport; 547 struct sctp_transport *transport;
509 struct inet_sock *inet; 548 struct inet_sock *inet;
510 sk_buff_data_t saveip, savesctp; 549 sk_buff_data_t saveip, savesctp;
511 int err; 550 int err;
512 551
513 if (skb->len < ihlen + 8) { 552 if (skb->len < ihlen + 8) {
514 ICMP_INC_STATS_BH(ICMP_MIB_INE !! 553 ICMP_INC_STATS_BH(&init_net, ICMP_MIB_INERRORS);
515 return; 554 return;
516 } 555 }
517 556
518 /* Fix up skb to look at the embedded 557 /* Fix up skb to look at the embedded net header. */
519 saveip = skb->network_header; 558 saveip = skb->network_header;
520 savesctp = skb->transport_header; 559 savesctp = skb->transport_header;
521 skb_reset_network_header(skb); 560 skb_reset_network_header(skb);
522 skb_set_transport_header(skb, ihlen); 561 skb_set_transport_header(skb, ihlen);
523 sk = sctp_err_lookup(AF_INET, skb, sct 562 sk = sctp_err_lookup(AF_INET, skb, sctp_hdr(skb), &asoc, &transport);
524 /* Put back, the original values. */ 563 /* Put back, the original values. */
525 skb->network_header = saveip; 564 skb->network_header = saveip;
526 skb->transport_header = savesctp; 565 skb->transport_header = savesctp;
527 if (!sk) { 566 if (!sk) {
528 ICMP_INC_STATS_BH(ICMP_MIB_INE !! 567 ICMP_INC_STATS_BH(&init_net, ICMP_MIB_INERRORS);
529 return; 568 return;
530 } 569 }
531 /* Warning: The sock lock is held. R 570 /* Warning: The sock lock is held. Remember to call
532 * sctp_err_finish! 571 * sctp_err_finish!
533 */ 572 */
534 573
535 switch (type) { 574 switch (type) {
536 case ICMP_PARAMETERPROB: 575 case ICMP_PARAMETERPROB:
537 err = EPROTO; 576 err = EPROTO;
538 break; 577 break;
539 case ICMP_DEST_UNREACH: 578 case ICMP_DEST_UNREACH:
540 if (code > NR_ICMP_UNREACH) 579 if (code > NR_ICMP_UNREACH)
541 goto out_unlock; 580 goto out_unlock;
542 581
543 /* PMTU discovery (RFC1191) */ 582 /* PMTU discovery (RFC1191) */
544 if (ICMP_FRAG_NEEDED == code) 583 if (ICMP_FRAG_NEEDED == code) {
545 sctp_icmp_frag_needed( 584 sctp_icmp_frag_needed(sk, asoc, transport, info);
546 goto out_unlock; 585 goto out_unlock;
547 } 586 }
548 else { 587 else {
549 if (ICMP_PROT_UNREACH 588 if (ICMP_PROT_UNREACH == code) {
550 sctp_icmp_prot 589 sctp_icmp_proto_unreachable(sk, asoc,
551 590 transport);
552 goto out_unloc 591 goto out_unlock;
553 } 592 }
554 } 593 }
555 err = icmp_err_convert[code].e 594 err = icmp_err_convert[code].errno;
556 break; 595 break;
557 case ICMP_TIME_EXCEEDED: 596 case ICMP_TIME_EXCEEDED:
558 /* Ignore any time exceeded er 597 /* Ignore any time exceeded errors due to fragment reassembly
559 * timeouts. 598 * timeouts.
560 */ 599 */
561 if (ICMP_EXC_FRAGTIME == code) 600 if (ICMP_EXC_FRAGTIME == code)
562 goto out_unlock; 601 goto out_unlock;
563 602
564 err = EHOSTUNREACH; 603 err = EHOSTUNREACH;
565 break; 604 break;
566 default: 605 default:
567 goto out_unlock; 606 goto out_unlock;
568 } 607 }
569 608
570 inet = inet_sk(sk); 609 inet = inet_sk(sk);
571 if (!sock_owned_by_user(sk) && inet->r 610 if (!sock_owned_by_user(sk) && inet->recverr) {
572 sk->sk_err = err; 611 sk->sk_err = err;
573 sk->sk_error_report(sk); 612 sk->sk_error_report(sk);
574 } else { /* Only an error on timeout 613 } else { /* Only an error on timeout */
575 sk->sk_err_soft = err; 614 sk->sk_err_soft = err;
576 } 615 }
577 616
578 out_unlock: 617 out_unlock:
579 sctp_err_finish(sk, asoc); 618 sctp_err_finish(sk, asoc);
580 } 619 }
581 620
582 /* 621 /*
583 * RFC 2960, 8.4 - Handle "Out of the blue" Pa 622 * RFC 2960, 8.4 - Handle "Out of the blue" Packets.
584 * 623 *
585 * This function scans all the chunks in the O 624 * This function scans all the chunks in the OOTB packet to determine if
586 * the packet should be discarded right away. 625 * the packet should be discarded right away. If a response might be needed
587 * for this packet, or, if further processing 626 * for this packet, or, if further processing is possible, the packet will
588 * be queued to a proper inqueue for the next 627 * be queued to a proper inqueue for the next phase of handling.
589 * 628 *
590 * Output: 629 * Output:
591 * Return 0 - If further processing is needed. 630 * Return 0 - If further processing is needed.
592 * Return 1 - If the packet can be discarded r 631 * Return 1 - If the packet can be discarded right away.
593 */ 632 */
594 static int sctp_rcv_ootb(struct sk_buff *skb) 633 static int sctp_rcv_ootb(struct sk_buff *skb)
595 { 634 {
596 sctp_chunkhdr_t *ch; 635 sctp_chunkhdr_t *ch;
597 __u8 *ch_end; 636 __u8 *ch_end;
598 sctp_errhdr_t *err; 637 sctp_errhdr_t *err;
599 638
600 ch = (sctp_chunkhdr_t *) skb->data; 639 ch = (sctp_chunkhdr_t *) skb->data;
601 640
602 /* Scan through all the chunks in the 641 /* Scan through all the chunks in the packet. */
603 do { 642 do {
604 /* Break out if chunk length i 643 /* Break out if chunk length is less then minimal. */
605 if (ntohs(ch->length) < sizeof 644 if (ntohs(ch->length) < sizeof(sctp_chunkhdr_t))
606 break; 645 break;
607 646
608 ch_end = ((__u8 *)ch) + WORD_R 647 ch_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
609 if (ch_end > skb_tail_pointer( 648 if (ch_end > skb_tail_pointer(skb))
610 break; 649 break;
611 650
612 /* RFC 8.4, 2) If the OOTB pac 651 /* RFC 8.4, 2) If the OOTB packet contains an ABORT chunk, the
613 * receiver MUST silently disc 652 * receiver MUST silently discard the OOTB packet and take no
614 * further action. 653 * further action.
615 */ 654 */
616 if (SCTP_CID_ABORT == ch->type 655 if (SCTP_CID_ABORT == ch->type)
617 goto discard; 656 goto discard;
618 657
619 /* RFC 8.4, 6) If the packet c 658 /* RFC 8.4, 6) If the packet contains a SHUTDOWN COMPLETE
620 * chunk, the receiver should 659 * chunk, the receiver should silently discard the packet
621 * and take no further action. 660 * and take no further action.
622 */ 661 */
623 if (SCTP_CID_SHUTDOWN_COMPLETE 662 if (SCTP_CID_SHUTDOWN_COMPLETE == ch->type)
624 goto discard; 663 goto discard;
625 664
626 /* RFC 4460, 2.11.2 665 /* RFC 4460, 2.11.2
627 * This will discard packets w 666 * This will discard packets with INIT chunk bundled as
628 * subsequent chunks in the pa 667 * subsequent chunks in the packet. When INIT is first,
629 * the normal INIT processing 668 * the normal INIT processing will discard the chunk.
630 */ 669 */
631 if (SCTP_CID_INIT == ch->type 670 if (SCTP_CID_INIT == ch->type && (void *)ch != skb->data)
632 goto discard; 671 goto discard;
633 672
634 /* RFC 8.4, 7) If the packet c 673 /* RFC 8.4, 7) If the packet contains a "Stale cookie" ERROR
635 * or a COOKIE ACK the SCTP Pa 674 * or a COOKIE ACK the SCTP Packet should be silently
636 * discarded. 675 * discarded.
637 */ 676 */
638 if (SCTP_CID_COOKIE_ACK == ch- 677 if (SCTP_CID_COOKIE_ACK == ch->type)
639 goto discard; 678 goto discard;
640 679
641 if (SCTP_CID_ERROR == ch->type 680 if (SCTP_CID_ERROR == ch->type) {
642 sctp_walk_errors(err, 681 sctp_walk_errors(err, ch) {
643 if (SCTP_ERROR 682 if (SCTP_ERROR_STALE_COOKIE == err->cause)
644 goto d 683 goto discard;
645 } 684 }
646 } 685 }
647 686
648 ch = (sctp_chunkhdr_t *) ch_en 687 ch = (sctp_chunkhdr_t *) ch_end;
649 } while (ch_end < skb_tail_pointer(skb 688 } while (ch_end < skb_tail_pointer(skb));
650 689
651 return 0; 690 return 0;
652 691
653 discard: 692 discard:
654 return 1; 693 return 1;
655 } 694 }
656 695
657 /* Insert endpoint into the hash table. */ 696 /* Insert endpoint into the hash table. */
658 static void __sctp_hash_endpoint(struct sctp_e 697 static void __sctp_hash_endpoint(struct sctp_endpoint *ep)
659 { 698 {
660 struct sctp_ep_common *epb; 699 struct sctp_ep_common *epb;
661 struct sctp_hashbucket *head; 700 struct sctp_hashbucket *head;
662 701
663 epb = &ep->base; 702 epb = &ep->base;
664 703
665 epb->hashent = sctp_ep_hashfn(epb->bin 704 epb->hashent = sctp_ep_hashfn(epb->bind_addr.port);
666 head = &sctp_ep_hashtable[epb->hashent 705 head = &sctp_ep_hashtable[epb->hashent];
667 706
668 sctp_write_lock(&head->lock); 707 sctp_write_lock(&head->lock);
669 hlist_add_head(&epb->node, &head->chai 708 hlist_add_head(&epb->node, &head->chain);
670 sctp_write_unlock(&head->lock); 709 sctp_write_unlock(&head->lock);
671 } 710 }
672 711
673 /* Add an endpoint to the hash. Local BH-safe. 712 /* Add an endpoint to the hash. Local BH-safe. */
674 void sctp_hash_endpoint(struct sctp_endpoint * 713 void sctp_hash_endpoint(struct sctp_endpoint *ep)
675 { 714 {
676 sctp_local_bh_disable(); 715 sctp_local_bh_disable();
677 __sctp_hash_endpoint(ep); 716 __sctp_hash_endpoint(ep);
678 sctp_local_bh_enable(); 717 sctp_local_bh_enable();
679 } 718 }
680 719
681 /* Remove endpoint from the hash table. */ 720 /* Remove endpoint from the hash table. */
682 static void __sctp_unhash_endpoint(struct sctp 721 static void __sctp_unhash_endpoint(struct sctp_endpoint *ep)
683 { 722 {
684 struct sctp_hashbucket *head; 723 struct sctp_hashbucket *head;
685 struct sctp_ep_common *epb; 724 struct sctp_ep_common *epb;
686 725
687 epb = &ep->base; 726 epb = &ep->base;
688 727
689 if (hlist_unhashed(&epb->node)) 728 if (hlist_unhashed(&epb->node))
690 return; 729 return;
691 730
692 epb->hashent = sctp_ep_hashfn(epb->bin 731 epb->hashent = sctp_ep_hashfn(epb->bind_addr.port);
693 732
694 head = &sctp_ep_hashtable[epb->hashent 733 head = &sctp_ep_hashtable[epb->hashent];
695 734
696 sctp_write_lock(&head->lock); 735 sctp_write_lock(&head->lock);
697 __hlist_del(&epb->node); 736 __hlist_del(&epb->node);
698 sctp_write_unlock(&head->lock); 737 sctp_write_unlock(&head->lock);
699 } 738 }
700 739
701 /* Remove endpoint from the hash. Local BH-sa 740 /* Remove endpoint from the hash. Local BH-safe. */
702 void sctp_unhash_endpoint(struct sctp_endpoint 741 void sctp_unhash_endpoint(struct sctp_endpoint *ep)
703 { 742 {
704 sctp_local_bh_disable(); 743 sctp_local_bh_disable();
705 __sctp_unhash_endpoint(ep); 744 __sctp_unhash_endpoint(ep);
706 sctp_local_bh_enable(); 745 sctp_local_bh_enable();
707 } 746 }
708 747
709 /* Look up an endpoint. */ 748 /* Look up an endpoint. */
710 static struct sctp_endpoint *__sctp_rcv_lookup 749 static struct sctp_endpoint *__sctp_rcv_lookup_endpoint(const union sctp_addr *laddr)
711 { 750 {
712 struct sctp_hashbucket *head; 751 struct sctp_hashbucket *head;
713 struct sctp_ep_common *epb; 752 struct sctp_ep_common *epb;
714 struct sctp_endpoint *ep; 753 struct sctp_endpoint *ep;
715 struct hlist_node *node; 754 struct hlist_node *node;
716 int hash; 755 int hash;
717 756
718 hash = sctp_ep_hashfn(ntohs(laddr->v4. 757 hash = sctp_ep_hashfn(ntohs(laddr->v4.sin_port));
719 head = &sctp_ep_hashtable[hash]; 758 head = &sctp_ep_hashtable[hash];
720 read_lock(&head->lock); 759 read_lock(&head->lock);
721 sctp_for_each_hentry(epb, node, &head- 760 sctp_for_each_hentry(epb, node, &head->chain) {
722 ep = sctp_ep(epb); 761 ep = sctp_ep(epb);
723 if (sctp_endpoint_is_match(ep, 762 if (sctp_endpoint_is_match(ep, laddr))
724 goto hit; 763 goto hit;
725 } 764 }
726 765
727 ep = sctp_sk((sctp_get_ctl_sock()))->e 766 ep = sctp_sk((sctp_get_ctl_sock()))->ep;
728 epb = &ep->base; <<
729 767
730 hit: 768 hit:
731 sctp_endpoint_hold(ep); 769 sctp_endpoint_hold(ep);
732 read_unlock(&head->lock); 770 read_unlock(&head->lock);
733 return ep; 771 return ep;
734 } 772 }
735 773
736 /* Insert association into the hash table. */ 774 /* Insert association into the hash table. */
737 static void __sctp_hash_established(struct sct 775 static void __sctp_hash_established(struct sctp_association *asoc)
738 { 776 {
739 struct sctp_ep_common *epb; 777 struct sctp_ep_common *epb;
740 struct sctp_hashbucket *head; 778 struct sctp_hashbucket *head;
741 779
742 epb = &asoc->base; 780 epb = &asoc->base;
743 781
744 /* Calculate which chain this entry wi 782 /* Calculate which chain this entry will belong to. */
745 epb->hashent = sctp_assoc_hashfn(epb-> 783 epb->hashent = sctp_assoc_hashfn(epb->bind_addr.port, asoc->peer.port);
746 784
747 head = &sctp_assoc_hashtable[epb->hash 785 head = &sctp_assoc_hashtable[epb->hashent];
748 786
749 sctp_write_lock(&head->lock); 787 sctp_write_lock(&head->lock);
750 hlist_add_head(&epb->node, &head->chai 788 hlist_add_head(&epb->node, &head->chain);
751 sctp_write_unlock(&head->lock); 789 sctp_write_unlock(&head->lock);
752 } 790 }
753 791
754 /* Add an association to the hash. Local BH-sa 792 /* Add an association to the hash. Local BH-safe. */
755 void sctp_hash_established(struct sctp_associa 793 void sctp_hash_established(struct sctp_association *asoc)
756 { 794 {
757 if (asoc->temp) 795 if (asoc->temp)
758 return; 796 return;
759 797
760 sctp_local_bh_disable(); 798 sctp_local_bh_disable();
761 __sctp_hash_established(asoc); 799 __sctp_hash_established(asoc);
762 sctp_local_bh_enable(); 800 sctp_local_bh_enable();
763 } 801 }
764 802
765 /* Remove association from the hash table. */ 803 /* Remove association from the hash table. */
766 static void __sctp_unhash_established(struct s 804 static void __sctp_unhash_established(struct sctp_association *asoc)
767 { 805 {
768 struct sctp_hashbucket *head; 806 struct sctp_hashbucket *head;
769 struct sctp_ep_common *epb; 807 struct sctp_ep_common *epb;
770 808
771 epb = &asoc->base; 809 epb = &asoc->base;
772 810
773 epb->hashent = sctp_assoc_hashfn(epb-> 811 epb->hashent = sctp_assoc_hashfn(epb->bind_addr.port,
774 asoc- 812 asoc->peer.port);
775 813
776 head = &sctp_assoc_hashtable[epb->hash 814 head = &sctp_assoc_hashtable[epb->hashent];
777 815
778 sctp_write_lock(&head->lock); 816 sctp_write_lock(&head->lock);
779 __hlist_del(&epb->node); 817 __hlist_del(&epb->node);
780 sctp_write_unlock(&head->lock); 818 sctp_write_unlock(&head->lock);
781 } 819 }
782 820
783 /* Remove association from the hash table. Lo 821 /* Remove association from the hash table. Local BH-safe. */
784 void sctp_unhash_established(struct sctp_assoc 822 void sctp_unhash_established(struct sctp_association *asoc)
785 { 823 {
786 if (asoc->temp) 824 if (asoc->temp)
787 return; 825 return;
788 826
789 sctp_local_bh_disable(); 827 sctp_local_bh_disable();
790 __sctp_unhash_established(asoc); 828 __sctp_unhash_established(asoc);
791 sctp_local_bh_enable(); 829 sctp_local_bh_enable();
792 } 830 }
793 831
794 /* Look up an association. */ 832 /* Look up an association. */
795 static struct sctp_association *__sctp_lookup_ 833 static struct sctp_association *__sctp_lookup_association(
796 const 834 const union sctp_addr *local,
797 const 835 const union sctp_addr *peer,
798 struct 836 struct sctp_transport **pt)
799 { 837 {
800 struct sctp_hashbucket *head; 838 struct sctp_hashbucket *head;
801 struct sctp_ep_common *epb; 839 struct sctp_ep_common *epb;
802 struct sctp_association *asoc; 840 struct sctp_association *asoc;
803 struct sctp_transport *transport; 841 struct sctp_transport *transport;
804 struct hlist_node *node; 842 struct hlist_node *node;
805 int hash; 843 int hash;
806 844
807 /* Optimize here for direct hit, only 845 /* Optimize here for direct hit, only listening connections can
808 * have wildcards anyways. 846 * have wildcards anyways.
809 */ 847 */
810 hash = sctp_assoc_hashfn(ntohs(local-> 848 hash = sctp_assoc_hashfn(ntohs(local->v4.sin_port), ntohs(peer->v4.sin_port));
811 head = &sctp_assoc_hashtable[hash]; 849 head = &sctp_assoc_hashtable[hash];
812 read_lock(&head->lock); 850 read_lock(&head->lock);
813 sctp_for_each_hentry(epb, node, &head- 851 sctp_for_each_hentry(epb, node, &head->chain) {
814 asoc = sctp_assoc(epb); 852 asoc = sctp_assoc(epb);
815 transport = sctp_assoc_is_matc 853 transport = sctp_assoc_is_match(asoc, local, peer);
816 if (transport) 854 if (transport)
817 goto hit; 855 goto hit;
818 } 856 }
819 857
820 read_unlock(&head->lock); 858 read_unlock(&head->lock);
821 859
822 return NULL; 860 return NULL;
823 861
824 hit: 862 hit:
825 *pt = transport; 863 *pt = transport;
826 sctp_association_hold(asoc); 864 sctp_association_hold(asoc);
827 read_unlock(&head->lock); 865 read_unlock(&head->lock);
828 return asoc; 866 return asoc;
829 } 867 }
830 868
831 /* Look up an association. BH-safe. */ 869 /* Look up an association. BH-safe. */
832 SCTP_STATIC 870 SCTP_STATIC
833 struct sctp_association *sctp_lookup_associati 871 struct sctp_association *sctp_lookup_association(const union sctp_addr *laddr,
834 872 const union sctp_addr *paddr,
835 st 873 struct sctp_transport **transportp)
836 { 874 {
837 struct sctp_association *asoc; 875 struct sctp_association *asoc;
838 876
839 sctp_local_bh_disable(); 877 sctp_local_bh_disable();
840 asoc = __sctp_lookup_association(laddr 878 asoc = __sctp_lookup_association(laddr, paddr, transportp);
841 sctp_local_bh_enable(); 879 sctp_local_bh_enable();
842 880
843 return asoc; 881 return asoc;
844 } 882 }
845 883
846 /* Is there an association matching the given 884 /* Is there an association matching the given local and peer addresses? */
847 int sctp_has_association(const union sctp_addr 885 int sctp_has_association(const union sctp_addr *laddr,
848 const union sctp_addr 886 const union sctp_addr *paddr)
849 { 887 {
850 struct sctp_association *asoc; 888 struct sctp_association *asoc;
851 struct sctp_transport *transport; 889 struct sctp_transport *transport;
852 890
853 if ((asoc = sctp_lookup_association(la 891 if ((asoc = sctp_lookup_association(laddr, paddr, &transport))) {
854 sctp_association_put(asoc); 892 sctp_association_put(asoc);
855 return 1; 893 return 1;
856 } 894 }
857 895
858 return 0; 896 return 0;
859 } 897 }
860 898
861 /* 899 /*
862 * SCTP Implementors Guide, 2.18 Handling of a 900 * SCTP Implementors Guide, 2.18 Handling of address
863 * parameters within the INIT or INIT-ACK. 901 * parameters within the INIT or INIT-ACK.
864 * 902 *
865 * D) When searching for a matching TCB upon r 903 * D) When searching for a matching TCB upon reception of an INIT
866 * or INIT-ACK chunk the receiver SHOULD us 904 * or INIT-ACK chunk the receiver SHOULD use not only the
867 * source address of the packet (containing 905 * source address of the packet (containing the INIT or
868 * INIT-ACK) but the receiver SHOULD also u 906 * INIT-ACK) but the receiver SHOULD also use all valid
869 * address parameters contained within the 907 * address parameters contained within the chunk.
870 * 908 *
871 * 2.18.3 Solution description 909 * 2.18.3 Solution description
872 * 910 *
873 * This new text clearly specifies to an imple 911 * This new text clearly specifies to an implementor the need
874 * to look within the INIT or INIT-ACK. Any im 912 * to look within the INIT or INIT-ACK. Any implementation that
875 * does not do this, may not be able to establ 913 * does not do this, may not be able to establish associations
876 * in certain circumstances. 914 * in certain circumstances.
877 * 915 *
878 */ 916 */
879 static struct sctp_association *__sctp_rcv_ini 917 static struct sctp_association *__sctp_rcv_init_lookup(struct sk_buff *skb,
880 const union sctp_addr *laddr, struct s 918 const union sctp_addr *laddr, struct sctp_transport **transportp)
881 { 919 {
882 struct sctp_association *asoc; 920 struct sctp_association *asoc;
883 union sctp_addr addr; 921 union sctp_addr addr;
884 union sctp_addr *paddr = &addr; 922 union sctp_addr *paddr = &addr;
885 struct sctphdr *sh = sctp_hdr(skb); 923 struct sctphdr *sh = sctp_hdr(skb);
886 sctp_chunkhdr_t *ch; 924 sctp_chunkhdr_t *ch;
887 union sctp_params params; 925 union sctp_params params;
888 sctp_init_chunk_t *init; 926 sctp_init_chunk_t *init;
889 struct sctp_transport *transport; 927 struct sctp_transport *transport;
890 struct sctp_af *af; 928 struct sctp_af *af;
891 929
892 ch = (sctp_chunkhdr_t *) skb->data; 930 ch = (sctp_chunkhdr_t *) skb->data;
893 931
894 /* 932 /*
895 * This code will NOT touch anything i 933 * This code will NOT touch anything inside the chunk--it is
896 * strictly READ-ONLY. 934 * strictly READ-ONLY.
897 * 935 *
898 * RFC 2960 3 SCTP packet Format 936 * RFC 2960 3 SCTP packet Format
899 * 937 *
900 * Multiple chunks can be bundled into 938 * Multiple chunks can be bundled into one SCTP packet up to
901 * the MTU size, except for the INIT, 939 * the MTU size, except for the INIT, INIT ACK, and SHUTDOWN
902 * COMPLETE chunks. These chunks MUST 940 * COMPLETE chunks. These chunks MUST NOT be bundled with any
903 * other chunk in a packet. See Secti 941 * other chunk in a packet. See Section 6.10 for more details
904 * on chunk bundling. 942 * on chunk bundling.
905 */ 943 */
906 944
907 /* Find the start of the TLVs and the 945 /* Find the start of the TLVs and the end of the chunk. This is
908 * the region we search for address pa 946 * the region we search for address parameters.
909 */ 947 */
910 init = (sctp_init_chunk_t *)skb->data; 948 init = (sctp_init_chunk_t *)skb->data;
911 949
912 /* Walk the parameters looking for emb 950 /* Walk the parameters looking for embedded addresses. */
913 sctp_walk_params(params, init, init_hd 951 sctp_walk_params(params, init, init_hdr.params) {
914 952
915 /* Note: Ignoring hostname add 953 /* Note: Ignoring hostname addresses. */
916 af = sctp_get_af_specific(para 954 af = sctp_get_af_specific(param_type2af(params.p->type));
917 if (!af) 955 if (!af)
918 continue; 956 continue;
919 957
920 af->from_addr_param(paddr, par 958 af->from_addr_param(paddr, params.addr, sh->source, 0);
921 959
922 asoc = __sctp_lookup_associati 960 asoc = __sctp_lookup_association(laddr, paddr, &transport);
923 if (asoc) 961 if (asoc)
924 return asoc; 962 return asoc;
925 } 963 }
926 964
927 return NULL; 965 return NULL;
928 } 966 }
929 967
930 /* ADD-IP, Section 5.2 968 /* ADD-IP, Section 5.2
931 * When an endpoint receives an ASCONF Chunk f 969 * When an endpoint receives an ASCONF Chunk from the remote peer
932 * special procedures may be needed to identif 970 * special procedures may be needed to identify the association the
933 * ASCONF Chunk is associated with. To properl 971 * ASCONF Chunk is associated with. To properly find the association
934 * the following procedures SHOULD be followed 972 * the following procedures SHOULD be followed:
935 * 973 *
936 * D2) If the association is not found, use th 974 * D2) If the association is not found, use the address found in the
937 * Address Parameter TLV combined with the por 975 * Address Parameter TLV combined with the port number found in the
938 * SCTP common header. If found proceed to rul 976 * SCTP common header. If found proceed to rule D4.
939 * 977 *
940 * D2-ext) If more than one ASCONF Chunks are 978 * D2-ext) If more than one ASCONF Chunks are packed together, use the
941 * address found in the ASCONF Address Paramet 979 * address found in the ASCONF Address Parameter TLV of each of the
942 * subsequent ASCONF Chunks. If found, proceed 980 * subsequent ASCONF Chunks. If found, proceed to rule D4.
943 */ 981 */
944 static struct sctp_association *__sctp_rcv_asc 982 static struct sctp_association *__sctp_rcv_asconf_lookup(
945 sctp_c 983 sctp_chunkhdr_t *ch,
946 const 984 const union sctp_addr *laddr,
947 __be16 985 __be16 peer_port,
948 struct 986 struct sctp_transport **transportp)
949 { 987 {
950 sctp_addip_chunk_t *asconf = (struct s 988 sctp_addip_chunk_t *asconf = (struct sctp_addip_chunk *)ch;
951 struct sctp_af *af; 989 struct sctp_af *af;
952 union sctp_addr_param *param; 990 union sctp_addr_param *param;
953 union sctp_addr paddr; 991 union sctp_addr paddr;
954 992
955 /* Skip over the ADDIP header and find 993 /* Skip over the ADDIP header and find the Address parameter */
956 param = (union sctp_addr_param *)(asco 994 param = (union sctp_addr_param *)(asconf + 1);
957 995
958 af = sctp_get_af_specific(param_type2a 996 af = sctp_get_af_specific(param_type2af(param->v4.param_hdr.type));
959 if (unlikely(!af)) 997 if (unlikely(!af))
960 return NULL; 998 return NULL;
961 999
962 af->from_addr_param(&paddr, param, pee 1000 af->from_addr_param(&paddr, param, peer_port, 0);
963 1001
964 return __sctp_lookup_association(laddr 1002 return __sctp_lookup_association(laddr, &paddr, transportp);
965 } 1003 }
966 1004
967 1005
968 /* SCTP-AUTH, Section 6.3: 1006 /* SCTP-AUTH, Section 6.3:
969 * If the receiver does not find a STCB for 1007 * If the receiver does not find a STCB for a packet containing an AUTH
970 * chunk as the first chunk and not a COOKIE 1008 * chunk as the first chunk and not a COOKIE-ECHO chunk as the second
971 * chunk, it MUST use the chunks after the A 1009 * chunk, it MUST use the chunks after the AUTH chunk to look up an existing
972 * association. 1010 * association.
973 * 1011 *
974 * This means that any chunks that can help us 1012 * This means that any chunks that can help us identify the association need
975 * to be looked at to find this assocation. 1013 * to be looked at to find this assocation.
976 */ 1014 */
977 static struct sctp_association *__sctp_rcv_wal 1015 static struct sctp_association *__sctp_rcv_walk_lookup(struct sk_buff *skb,
978 const un 1016 const union sctp_addr *laddr,
979 struct s 1017 struct sctp_transport **transportp)
980 { 1018 {
981 struct sctp_association *asoc = NULL; 1019 struct sctp_association *asoc = NULL;
982 sctp_chunkhdr_t *ch; 1020 sctp_chunkhdr_t *ch;
983 int have_auth = 0; 1021 int have_auth = 0;
984 unsigned int chunk_num = 1; 1022 unsigned int chunk_num = 1;
985 __u8 *ch_end; 1023 __u8 *ch_end;
986 1024
987 /* Walk through the chunks looking for 1025 /* Walk through the chunks looking for AUTH or ASCONF chunks
988 * to help us find the association. 1026 * to help us find the association.
989 */ 1027 */
990 ch = (sctp_chunkhdr_t *) skb->data; 1028 ch = (sctp_chunkhdr_t *) skb->data;
991 do { 1029 do {
992 /* Break out if chunk length i 1030 /* Break out if chunk length is less then minimal. */
993 if (ntohs(ch->length) < sizeof 1031 if (ntohs(ch->length) < sizeof(sctp_chunkhdr_t))
994 break; 1032 break;
995 1033
996 ch_end = ((__u8 *)ch) + WORD_R 1034 ch_end = ((__u8 *)ch) + WORD_ROUND(ntohs(ch->length));
997 if (ch_end > skb_tail_pointer( 1035 if (ch_end > skb_tail_pointer(skb))
998 break; 1036 break;
999 1037
1000 switch(ch->type) { 1038 switch(ch->type) {
1001 case SCTP_CID_AUTH: 1039 case SCTP_CID_AUTH:
1002 have_auth = chunk 1040 have_auth = chunk_num;
1003 break; 1041 break;
1004 1042
1005 case SCTP_CID_COOKIE_ECHO 1043 case SCTP_CID_COOKIE_ECHO:
1006 /* If a packet ar 1044 /* If a packet arrives containing an AUTH chunk as
1007 * a first chunk, 1045 * a first chunk, a COOKIE-ECHO chunk as the second
1008 * chunk, and pos 1046 * chunk, and possibly more chunks after them, and
1009 * the receiver d 1047 * the receiver does not have an STCB for that
1010 * packet, then a 1048 * packet, then authentication is based on
1011 * the contents o 1049 * the contents of the COOKIE- ECHO chunk.
1012 */ 1050 */
1013 if (have_auth == 1051 if (have_auth == 1 && chunk_num == 2)
1014 return NU 1052 return NULL;
1015 break; 1053 break;
1016 1054
1017 case SCTP_CID_ASCONF: 1055 case SCTP_CID_ASCONF:
1018 if (have_auth || 1056 if (have_auth || sctp_addip_noauth)
1019 asoc = __ 1057 asoc = __sctp_rcv_asconf_lookup(ch, laddr,
1020 1058 sctp_hdr(skb)->source,
1021 1059 transportp);
1022 default: 1060 default:
1023 break; 1061 break;
1024 } 1062 }
1025 1063
1026 if (asoc) 1064 if (asoc)
1027 break; 1065 break;
1028 1066
1029 ch = (sctp_chunkhdr_t *) ch_e 1067 ch = (sctp_chunkhdr_t *) ch_end;
1030 chunk_num++; 1068 chunk_num++;
1031 } while (ch_end < skb_tail_pointer(sk 1069 } while (ch_end < skb_tail_pointer(skb));
1032 1070
1033 return asoc; 1071 return asoc;
1034 } 1072 }
1035 1073
1036 /* 1074 /*
1037 * There are circumstances when we need to lo 1075 * There are circumstances when we need to look inside the SCTP packet
1038 * for information to help us find the associ 1076 * for information to help us find the association. Examples
1039 * include looking inside of INIT/INIT-ACK ch 1077 * include looking inside of INIT/INIT-ACK chunks or after the AUTH
1040 * chunks. 1078 * chunks.
1041 */ 1079 */
1042 static struct sctp_association *__sctp_rcv_lo 1080 static struct sctp_association *__sctp_rcv_lookup_harder(struct sk_buff *skb,
1043 const u 1081 const union sctp_addr *laddr,
1044 struct 1082 struct sctp_transport **transportp)
1045 { 1083 {
1046 sctp_chunkhdr_t *ch; 1084 sctp_chunkhdr_t *ch;
1047 1085
1048 ch = (sctp_chunkhdr_t *) skb->data; 1086 ch = (sctp_chunkhdr_t *) skb->data;
1049 1087
1050 /* The code below will attempt to wal 1088 /* The code below will attempt to walk the chunk and extract
1051 * parameter information. Before we 1089 * parameter information. Before we do that, we need to verify
1052 * that the chunk length doesn't caus 1090 * that the chunk length doesn't cause overflow. Otherwise, we'll
1053 * walk off the end. 1091 * walk off the end.
1054 */ 1092 */
1055 if (WORD_ROUND(ntohs(ch->length)) > s 1093 if (WORD_ROUND(ntohs(ch->length)) > skb->len)
1056 return NULL; 1094 return NULL;
1057 1095
1058 /* If this is INIT/INIT-ACK look insi 1096 /* If this is INIT/INIT-ACK look inside the chunk too. */
1059 switch (ch->type) { 1097 switch (ch->type) {
1060 case SCTP_CID_INIT: 1098 case SCTP_CID_INIT:
1061 case SCTP_CID_INIT_ACK: 1099 case SCTP_CID_INIT_ACK:
1062 return __sctp_rcv_init_lookup 1100 return __sctp_rcv_init_lookup(skb, laddr, transportp);
1063 break; 1101 break;
1064 1102
1065 default: 1103 default:
1066 return __sctp_rcv_walk_lookup 1104 return __sctp_rcv_walk_lookup(skb, laddr, transportp);
1067 break; 1105 break;
1068 } 1106 }
1069 1107
1070 1108
1071 return NULL; 1109 return NULL;
1072 } 1110 }
1073 1111
1074 /* Lookup an association for an inbound skb. 1112 /* Lookup an association for an inbound skb. */
1075 static struct sctp_association *__sctp_rcv_lo 1113 static struct sctp_association *__sctp_rcv_lookup(struct sk_buff *skb,
1076 const u 1114 const union sctp_addr *paddr,
1077 const u 1115 const union sctp_addr *laddr,
1078 struct 1116 struct sctp_transport **transportp)
1079 { 1117 {
1080 struct sctp_association *asoc; 1118 struct sctp_association *asoc;
1081 1119
1082 asoc = __sctp_lookup_association(ladd 1120 asoc = __sctp_lookup_association(laddr, paddr, transportp);
1083 1121
1084 /* Further lookup for INIT/INIT-ACK p 1122 /* Further lookup for INIT/INIT-ACK packets.
1085 * SCTP Implementors Guide, 2.18 Hand 1123 * SCTP Implementors Guide, 2.18 Handling of address
1086 * parameters within the INIT or INIT 1124 * parameters within the INIT or INIT-ACK.
1087 */ 1125 */
1088 if (!asoc) 1126 if (!asoc)
1089 asoc = __sctp_rcv_lookup_hard 1127 asoc = __sctp_rcv_lookup_harder(skb, laddr, transportp);
1090 1128
1091 return asoc; 1129 return asoc;
1092 } 1130 }
1093 1131
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