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