ia64/linux-2.6.18-xen.hg

view net/sctp/bind_addr.c @ 871:9cbcc9008446

xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in
drivers/xen/core/smpboot.c, but actually results - at least for
secondary CPUs - in the Xen-specific value written to be later
overwritten with whatever the generic code determines (with no
guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 14 10:09:15 2009 +0100 (2009-05-14)
parents 831230e53067
children
line source
1 /* SCTP kernel reference Implementation
2 * (C) Copyright IBM Corp. 2001, 2003
3 * Copyright (c) Cisco 1999,2000
4 * Copyright (c) Motorola 1999,2000,2001
5 * Copyright (c) La Monte H.P. Yarroll 2001
6 *
7 * This file is part of the SCTP kernel reference implementation.
8 *
9 * A collection class to handle the storage of transport addresses.
10 *
11 * The SCTP reference implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
16 *
17 * The SCTP reference implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
22 *
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, write to
25 * the Free Software Foundation, 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
27 *
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
31 *
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
34 *
35 * Written or modified by:
36 * La Monte H.P. Yarroll <piggy@acm.org>
37 * Karl Knutson <karl@athena.chicago.il.us>
38 * Jon Grimm <jgrimm@us.ibm.com>
39 * Daisy Chang <daisyc@us.ibm.com>
40 *
41 * Any bugs reported given to us we will try to fix... any fixes shared will
42 * be incorporated into the next SCTP release.
43 */
45 #include <linux/types.h>
46 #include <linux/sched.h>
47 #include <linux/in.h>
48 #include <net/sock.h>
49 #include <net/ipv6.h>
50 #include <net/if_inet6.h>
51 #include <net/sctp/sctp.h>
52 #include <net/sctp/sm.h>
54 /* Forward declarations for internal helpers. */
55 static int sctp_copy_one_addr(struct sctp_bind_addr *, union sctp_addr *,
56 sctp_scope_t scope, gfp_t gfp,
57 int flags);
58 static void sctp_bind_addr_clean(struct sctp_bind_addr *);
60 /* First Level Abstractions. */
62 /* Copy 'src' to 'dest' taking 'scope' into account. Omit addresses
63 * in 'src' which have a broader scope than 'scope'.
64 */
65 int sctp_bind_addr_copy(struct sctp_bind_addr *dest,
66 const struct sctp_bind_addr *src,
67 sctp_scope_t scope, gfp_t gfp,
68 int flags)
69 {
70 struct sctp_sockaddr_entry *addr;
71 struct list_head *pos;
72 int error = 0;
74 /* All addresses share the same port. */
75 dest->port = src->port;
77 /* Extract the addresses which are relevant for this scope. */
78 list_for_each(pos, &src->address_list) {
79 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
80 error = sctp_copy_one_addr(dest, &addr->a, scope,
81 gfp, flags);
82 if (error < 0)
83 goto out;
84 }
86 /* If there are no addresses matching the scope and
87 * this is global scope, try to get a link scope address, with
88 * the assumption that we must be sitting behind a NAT.
89 */
90 if (list_empty(&dest->address_list) && (SCTP_SCOPE_GLOBAL == scope)) {
91 list_for_each(pos, &src->address_list) {
92 addr = list_entry(pos, struct sctp_sockaddr_entry,
93 list);
94 error = sctp_copy_one_addr(dest, &addr->a,
95 SCTP_SCOPE_LINK, gfp,
96 flags);
97 if (error < 0)
98 goto out;
99 }
100 }
102 out:
103 if (error)
104 sctp_bind_addr_clean(dest);
106 return error;
107 }
109 /* Initialize the SCTP_bind_addr structure for either an endpoint or
110 * an association.
111 */
112 void sctp_bind_addr_init(struct sctp_bind_addr *bp, __u16 port)
113 {
114 bp->malloced = 0;
116 INIT_LIST_HEAD(&bp->address_list);
117 bp->port = port;
118 }
120 /* Dispose of the address list. */
121 static void sctp_bind_addr_clean(struct sctp_bind_addr *bp)
122 {
123 struct sctp_sockaddr_entry *addr;
124 struct list_head *pos, *temp;
126 /* Empty the bind address list. */
127 list_for_each_safe(pos, temp, &bp->address_list) {
128 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
129 list_del(pos);
130 kfree(addr);
131 SCTP_DBG_OBJCNT_DEC(addr);
132 }
133 }
135 /* Dispose of an SCTP_bind_addr structure */
136 void sctp_bind_addr_free(struct sctp_bind_addr *bp)
137 {
138 /* Empty the bind address list. */
139 sctp_bind_addr_clean(bp);
141 if (bp->malloced) {
142 kfree(bp);
143 SCTP_DBG_OBJCNT_DEC(bind_addr);
144 }
145 }
147 /* Add an address to the bind address list in the SCTP_bind_addr structure. */
148 int sctp_add_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *new,
149 __u8 use_as_src, gfp_t gfp)
150 {
151 struct sctp_sockaddr_entry *addr;
153 /* Add the address to the bind address list. */
154 addr = t_new(struct sctp_sockaddr_entry, gfp);
155 if (!addr)
156 return -ENOMEM;
158 memcpy(&addr->a, new, sizeof(*new));
160 /* Fix up the port if it has not yet been set.
161 * Both v4 and v6 have the port at the same offset.
162 */
163 if (!addr->a.v4.sin_port)
164 addr->a.v4.sin_port = bp->port;
166 addr->use_as_src = use_as_src;
168 INIT_LIST_HEAD(&addr->list);
169 list_add_tail(&addr->list, &bp->address_list);
170 SCTP_DBG_OBJCNT_INC(addr);
172 return 0;
173 }
175 /* Delete an address from the bind address list in the SCTP_bind_addr
176 * structure.
177 */
178 int sctp_del_bind_addr(struct sctp_bind_addr *bp, union sctp_addr *del_addr)
179 {
180 struct list_head *pos, *temp;
181 struct sctp_sockaddr_entry *addr;
183 list_for_each_safe(pos, temp, &bp->address_list) {
184 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
185 if (sctp_cmp_addr_exact(&addr->a, del_addr)) {
186 /* Found the exact match. */
187 list_del(pos);
188 kfree(addr);
189 SCTP_DBG_OBJCNT_DEC(addr);
191 return 0;
192 }
193 }
195 return -EINVAL;
196 }
198 /* Create a network byte-order representation of all the addresses
199 * formated as SCTP parameters.
200 *
201 * The second argument is the return value for the length.
202 */
203 union sctp_params sctp_bind_addrs_to_raw(const struct sctp_bind_addr *bp,
204 int *addrs_len,
205 gfp_t gfp)
206 {
207 union sctp_params addrparms;
208 union sctp_params retval;
209 int addrparms_len;
210 union sctp_addr_param rawaddr;
211 int len;
212 struct sctp_sockaddr_entry *addr;
213 struct list_head *pos;
214 struct sctp_af *af;
216 addrparms_len = 0;
217 len = 0;
219 /* Allocate enough memory at once. */
220 list_for_each(pos, &bp->address_list) {
221 len += sizeof(union sctp_addr_param);
222 }
224 /* Don't even bother embedding an address if there
225 * is only one.
226 */
227 if (len == sizeof(union sctp_addr_param)) {
228 retval.v = NULL;
229 goto end_raw;
230 }
232 retval.v = kmalloc(len, gfp);
233 if (!retval.v)
234 goto end_raw;
236 addrparms = retval;
238 list_for_each(pos, &bp->address_list) {
239 addr = list_entry(pos, struct sctp_sockaddr_entry, list);
240 af = sctp_get_af_specific(addr->a.v4.sin_family);
241 len = af->to_addr_param(&addr->a, &rawaddr);
242 memcpy(addrparms.v, &rawaddr, len);
243 addrparms.v += len;
244 addrparms_len += len;
245 }
247 end_raw:
248 *addrs_len = addrparms_len;
249 return retval;
250 }
252 /*
253 * Create an address list out of the raw address list format (IPv4 and IPv6
254 * address parameters).
255 */
256 int sctp_raw_to_bind_addrs(struct sctp_bind_addr *bp, __u8 *raw_addr_list,
257 int addrs_len, __u16 port, gfp_t gfp)
258 {
259 union sctp_addr_param *rawaddr;
260 struct sctp_paramhdr *param;
261 union sctp_addr addr;
262 int retval = 0;
263 int len;
264 struct sctp_af *af;
266 /* Convert the raw address to standard address format */
267 while (addrs_len) {
268 param = (struct sctp_paramhdr *)raw_addr_list;
269 rawaddr = (union sctp_addr_param *)raw_addr_list;
271 af = sctp_get_af_specific(param_type2af(param->type));
272 if (unlikely(!af)) {
273 retval = -EINVAL;
274 sctp_bind_addr_clean(bp);
275 break;
276 }
278 af->from_addr_param(&addr, rawaddr, port, 0);
279 retval = sctp_add_bind_addr(bp, &addr, 1, gfp);
280 if (retval) {
281 /* Can't finish building the list, clean up. */
282 sctp_bind_addr_clean(bp);
283 break;
284 }
286 len = ntohs(param->length);
287 addrs_len -= len;
288 raw_addr_list += len;
289 }
291 return retval;
292 }
294 /********************************************************************
295 * 2nd Level Abstractions
296 ********************************************************************/
298 /* Does this contain a specified address? Allow wildcarding. */
299 int sctp_bind_addr_match(struct sctp_bind_addr *bp,
300 const union sctp_addr *addr,
301 struct sctp_sock *opt)
302 {
303 struct sctp_sockaddr_entry *laddr;
304 struct list_head *pos;
306 list_for_each(pos, &bp->address_list) {
307 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
308 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
309 return 1;
310 }
312 return 0;
313 }
315 /* Find the first address in the bind address list that is not present in
316 * the addrs packed array.
317 */
318 union sctp_addr *sctp_find_unmatch_addr(struct sctp_bind_addr *bp,
319 const union sctp_addr *addrs,
320 int addrcnt,
321 struct sctp_sock *opt)
322 {
323 struct sctp_sockaddr_entry *laddr;
324 union sctp_addr *addr;
325 void *addr_buf;
326 struct sctp_af *af;
327 struct list_head *pos;
328 int i;
330 list_for_each(pos, &bp->address_list) {
331 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
333 addr_buf = (union sctp_addr *)addrs;
334 for (i = 0; i < addrcnt; i++) {
335 addr = (union sctp_addr *)addr_buf;
336 af = sctp_get_af_specific(addr->v4.sin_family);
337 if (!af)
338 return NULL;
340 if (opt->pf->cmp_addr(&laddr->a, addr, opt))
341 break;
343 addr_buf += af->sockaddr_len;
344 }
345 if (i == addrcnt)
346 return &laddr->a;
347 }
349 return NULL;
350 }
352 /* Copy out addresses from the global local address list. */
353 static int sctp_copy_one_addr(struct sctp_bind_addr *dest,
354 union sctp_addr *addr,
355 sctp_scope_t scope, gfp_t gfp,
356 int flags)
357 {
358 int error = 0;
360 if (sctp_is_any(addr)) {
361 error = sctp_copy_local_addr_list(dest, scope, gfp, flags);
362 } else if (sctp_in_scope(addr, scope)) {
363 /* Now that the address is in scope, check to see if
364 * the address type is supported by local sock as
365 * well as the remote peer.
366 */
367 if ((((AF_INET == addr->sa.sa_family) &&
368 (flags & SCTP_ADDR4_PEERSUPP))) ||
369 (((AF_INET6 == addr->sa.sa_family) &&
370 (flags & SCTP_ADDR6_ALLOWED) &&
371 (flags & SCTP_ADDR6_PEERSUPP))))
372 error = sctp_add_bind_addr(dest, addr, 1, gfp);
373 }
375 return error;
376 }
378 /* Is this a wildcard address? */
379 int sctp_is_any(const union sctp_addr *addr)
380 {
381 struct sctp_af *af = sctp_get_af_specific(addr->sa.sa_family);
382 if (!af)
383 return 0;
384 return af->is_any(addr);
385 }
387 /* Is 'addr' valid for 'scope'? */
388 int sctp_in_scope(const union sctp_addr *addr, sctp_scope_t scope)
389 {
390 sctp_scope_t addr_scope = sctp_scope(addr);
392 /* The unusable SCTP addresses will not be considered with
393 * any defined scopes.
394 */
395 if (SCTP_SCOPE_UNUSABLE == addr_scope)
396 return 0;
397 /*
398 * For INIT and INIT-ACK address list, let L be the level of
399 * of requested destination address, sender and receiver
400 * SHOULD include all of its addresses with level greater
401 * than or equal to L.
402 */
403 if (addr_scope <= scope)
404 return 1;
406 return 0;
407 }
409 /********************************************************************
410 * 3rd Level Abstractions
411 ********************************************************************/
413 /* What is the scope of 'addr'? */
414 sctp_scope_t sctp_scope(const union sctp_addr *addr)
415 {
416 struct sctp_af *af;
418 af = sctp_get_af_specific(addr->sa.sa_family);
419 if (!af)
420 return SCTP_SCOPE_UNUSABLE;
422 return af->scope((union sctp_addr *)addr);
423 }