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