ia64/linux-2.6.18-xen.hg

view net/sctp/ipv6.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. 2002, 2004
3 * Copyright (c) 2001 Nokia, Inc.
4 * Copyright (c) 2001 La Monte H.P. Yarroll
5 * Copyright (c) 2002-2003 Intel Corp.
6 *
7 * This file is part of the SCTP kernel reference Implementation
8 *
9 * SCTP over IPv6.
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 * Le Yanqun <yanqun.le@nokia.com>
37 * Hui Huang <hui.huang@nokia.com>
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Ardelle Fan <ardelle.fan@intel.com>
42 *
43 * Based on:
44 * linux/net/ipv6/tcp_ipv6.c
45 *
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
48 */
50 #include <linux/module.h>
51 #include <linux/errno.h>
52 #include <linux/types.h>
53 #include <linux/socket.h>
54 #include <linux/sockios.h>
55 #include <linux/net.h>
56 #include <linux/sched.h>
57 #include <linux/in.h>
58 #include <linux/in6.h>
59 #include <linux/netdevice.h>
60 #include <linux/init.h>
61 #include <linux/ipsec.h>
63 #include <linux/ipv6.h>
64 #include <linux/icmpv6.h>
65 #include <linux/random.h>
66 #include <linux/seq_file.h>
68 #include <net/protocol.h>
69 #include <net/ndisc.h>
70 #include <net/ip.h>
71 #include <net/ipv6.h>
72 #include <net/transp_v6.h>
73 #include <net/addrconf.h>
74 #include <net/ip6_route.h>
75 #include <net/inet_common.h>
76 #include <net/inet_ecn.h>
77 #include <net/sctp/sctp.h>
79 #include <asm/uaccess.h>
81 extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *);
82 static struct notifier_block sctp_inet6addr_notifier = {
83 .notifier_call = sctp_inetaddr_event,
84 };
86 /* ICMP error handler. */
87 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
88 int type, int code, int offset, __u32 info)
89 {
90 struct inet6_dev *idev;
91 struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
92 struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
93 struct sock *sk;
94 struct sctp_association *asoc;
95 struct sctp_transport *transport;
96 struct ipv6_pinfo *np;
97 char *saveip, *savesctp;
98 int err;
100 idev = in6_dev_get(skb->dev);
102 /* Fix up skb to look at the embedded net header. */
103 saveip = skb->nh.raw;
104 savesctp = skb->h.raw;
105 skb->nh.ipv6h = iph;
106 skb->h.raw = (char *)sh;
107 sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport);
108 /* Put back, the original pointers. */
109 skb->nh.raw = saveip;
110 skb->h.raw = savesctp;
111 if (!sk) {
112 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
113 goto out;
114 }
116 /* Warning: The sock lock is held. Remember to call
117 * sctp_err_finish!
118 */
120 switch (type) {
121 case ICMPV6_PKT_TOOBIG:
122 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
123 goto out_unlock;
124 case ICMPV6_PARAMPROB:
125 if (ICMPV6_UNK_NEXTHDR == code) {
126 sctp_icmp_proto_unreachable(sk, asoc, transport);
127 goto out_unlock;
128 }
129 break;
130 default:
131 break;
132 }
134 np = inet6_sk(sk);
135 icmpv6_err_convert(type, code, &err);
136 if (!sock_owned_by_user(sk) && np->recverr) {
137 sk->sk_err = err;
138 sk->sk_error_report(sk);
139 } else { /* Only an error on timeout */
140 sk->sk_err_soft = err;
141 }
143 out_unlock:
144 sctp_err_finish(sk, asoc);
145 out:
146 if (likely(idev != NULL))
147 in6_dev_put(idev);
148 }
150 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
151 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
152 int ipfragok)
153 {
154 struct sock *sk = skb->sk;
155 struct ipv6_pinfo *np = inet6_sk(sk);
156 struct flowi fl;
158 memset(&fl, 0, sizeof(fl));
160 fl.proto = sk->sk_protocol;
162 /* Fill in the dest address from the route entry passed with the skb
163 * and the source address from the transport.
164 */
165 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
166 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
168 fl.fl6_flowlabel = np->flow_label;
169 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
170 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
171 fl.oif = transport->saddr.v6.sin6_scope_id;
172 else
173 fl.oif = sk->sk_bound_dev_if;
174 fl.fl_ip_sport = inet_sk(sk)->sport;
175 fl.fl_ip_dport = transport->ipaddr.v6.sin6_port;
177 if (np->opt && np->opt->srcrt) {
178 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
179 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
180 }
182 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
183 "src:" NIP6_FMT " dst:" NIP6_FMT "\n",
184 __FUNCTION__, skb, skb->len,
185 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
187 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
189 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
190 }
192 /* Returns the dst cache entry for the given source and destination ip
193 * addresses.
194 */
195 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
196 union sctp_addr *daddr,
197 union sctp_addr *saddr)
198 {
199 struct dst_entry *dst;
200 struct flowi fl;
202 memset(&fl, 0, sizeof(fl));
203 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
204 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
205 fl.oif = daddr->v6.sin6_scope_id;
208 SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ",
209 __FUNCTION__, NIP6(fl.fl6_dst));
211 if (saddr) {
212 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
213 SCTP_DEBUG_PRINTK(
214 "SRC=" NIP6_FMT " - ",
215 NIP6(fl.fl6_src));
216 }
218 dst = ip6_route_output(NULL, &fl);
219 if (dst) {
220 struct rt6_info *rt;
221 rt = (struct rt6_info *)dst;
222 SCTP_DEBUG_PRINTK(
223 "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n",
224 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
225 } else {
226 SCTP_DEBUG_PRINTK("NO ROUTE\n");
227 }
229 return dst;
230 }
232 /* Returns the number of consecutive initial bits that match in the 2 ipv6
233 * addresses.
234 */
235 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
236 union sctp_addr *s2)
237 {
238 struct in6_addr *a1 = &s1->v6.sin6_addr;
239 struct in6_addr *a2 = &s2->v6.sin6_addr;
240 int i, j;
242 for (i = 0; i < 4 ; i++) {
243 __u32 a1xora2;
245 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
247 if ((j = fls(ntohl(a1xora2))))
248 return (i * 32 + 32 - j);
249 }
251 return (i*32);
252 }
254 /* Fills in the source address(saddr) based on the destination address(daddr)
255 * and asoc's bind address list.
256 */
257 static void sctp_v6_get_saddr(struct sctp_association *asoc,
258 struct dst_entry *dst,
259 union sctp_addr *daddr,
260 union sctp_addr *saddr)
261 {
262 struct sctp_bind_addr *bp;
263 rwlock_t *addr_lock;
264 struct sctp_sockaddr_entry *laddr;
265 struct list_head *pos;
266 sctp_scope_t scope;
267 union sctp_addr *baddr = NULL;
268 __u8 matchlen = 0;
269 __u8 bmatchlen;
271 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
272 "daddr:" NIP6_FMT " ",
273 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
275 if (!asoc) {
276 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
277 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n",
278 NIP6(saddr->v6.sin6_addr));
279 return;
280 }
282 scope = sctp_scope(daddr);
284 bp = &asoc->base.bind_addr;
285 addr_lock = &asoc->base.addr_lock;
287 /* Go through the bind address list and find the best source address
288 * that matches the scope of the destination address.
289 */
290 sctp_read_lock(addr_lock);
291 list_for_each(pos, &bp->address_list) {
292 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
293 if ((laddr->use_as_src) &&
294 (laddr->a.sa.sa_family == AF_INET6) &&
295 (scope <= sctp_scope(&laddr->a))) {
296 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
297 if (!baddr || (matchlen < bmatchlen)) {
298 baddr = &laddr->a;
299 matchlen = bmatchlen;
300 }
301 }
302 }
304 if (baddr) {
305 memcpy(saddr, baddr, sizeof(union sctp_addr));
306 SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n",
307 NIP6(saddr->v6.sin6_addr));
308 } else {
309 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
310 "address for the dest:" NIP6_FMT "\n",
311 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
312 }
314 sctp_read_unlock(addr_lock);
315 }
317 /* Make a copy of all potential local addresses. */
318 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
319 struct net_device *dev)
320 {
321 struct inet6_dev *in6_dev;
322 struct inet6_ifaddr *ifp;
323 struct sctp_sockaddr_entry *addr;
325 read_lock(&addrconf_lock);
326 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
327 read_unlock(&addrconf_lock);
328 return;
329 }
331 read_lock(&in6_dev->lock);
332 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
333 /* Add the address to the local list. */
334 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
335 if (addr) {
336 addr->a.v6.sin6_family = AF_INET6;
337 addr->a.v6.sin6_port = 0;
338 addr->a.v6.sin6_addr = ifp->addr;
339 addr->a.v6.sin6_scope_id = dev->ifindex;
340 INIT_LIST_HEAD(&addr->list);
341 list_add_tail(&addr->list, addrlist);
342 }
343 }
345 read_unlock(&in6_dev->lock);
346 read_unlock(&addrconf_lock);
347 }
349 /* Initialize a sockaddr_storage from in incoming skb. */
350 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
351 int is_saddr)
352 {
353 void *from;
354 __u16 *port;
355 struct sctphdr *sh;
357 port = &addr->v6.sin6_port;
358 addr->v6.sin6_family = AF_INET6;
359 addr->v6.sin6_flowinfo = 0; /* FIXME */
360 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
362 sh = (struct sctphdr *) skb->h.raw;
363 if (is_saddr) {
364 *port = ntohs(sh->source);
365 from = &skb->nh.ipv6h->saddr;
366 } else {
367 *port = ntohs(sh->dest);
368 from = &skb->nh.ipv6h->daddr;
369 }
370 ipv6_addr_copy(&addr->v6.sin6_addr, from);
371 }
373 /* Initialize an sctp_addr from a socket. */
374 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
375 {
376 addr->v6.sin6_family = AF_INET6;
377 addr->v6.sin6_port = inet_sk(sk)->num;
378 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
379 }
381 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
382 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
383 {
384 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
385 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
386 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
387 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
388 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
389 addr->v4.sin_addr.s_addr;
390 } else {
391 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
392 }
393 }
395 /* Initialize sk->sk_daddr from sctp_addr. */
396 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
397 {
398 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
399 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
400 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
401 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
402 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
403 } else {
404 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
405 }
406 }
408 /* Initialize a sctp_addr from an address parameter. */
409 static void sctp_v6_from_addr_param(union sctp_addr *addr,
410 union sctp_addr_param *param,
411 __u16 port, int iif)
412 {
413 addr->v6.sin6_family = AF_INET6;
414 addr->v6.sin6_port = port;
415 addr->v6.sin6_flowinfo = 0; /* BUG */
416 ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
417 addr->v6.sin6_scope_id = iif;
418 }
420 /* Initialize an address parameter from a sctp_addr and return the length
421 * of the address parameter.
422 */
423 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
424 union sctp_addr_param *param)
425 {
426 int length = sizeof(sctp_ipv6addr_param_t);
428 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
429 param->v6.param_hdr.length = ntohs(length);
430 ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
432 return length;
433 }
435 /* Initialize a sctp_addr from a dst_entry. */
436 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
437 unsigned short port)
438 {
439 struct rt6_info *rt = (struct rt6_info *)dst;
440 addr->sa.sa_family = AF_INET6;
441 addr->v6.sin6_port = port;
442 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
443 }
445 /* Compare addresses exactly.
446 * v4-mapped-v6 is also in consideration.
447 */
448 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
449 const union sctp_addr *addr2)
450 {
451 if (addr1->sa.sa_family != addr2->sa.sa_family) {
452 if (addr1->sa.sa_family == AF_INET &&
453 addr2->sa.sa_family == AF_INET6 &&
454 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
455 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
456 addr2->v6.sin6_addr.s6_addr32[3] ==
457 addr1->v4.sin_addr.s_addr)
458 return 1;
459 }
460 if (addr2->sa.sa_family == AF_INET &&
461 addr1->sa.sa_family == AF_INET6 &&
462 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
463 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
464 addr1->v6.sin6_addr.s6_addr32[3] ==
465 addr2->v4.sin_addr.s_addr)
466 return 1;
467 }
468 return 0;
469 }
470 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
471 return 0;
472 /* If this is a linklocal address, compare the scope_id. */
473 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
474 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
475 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
476 return 0;
477 }
478 }
480 return 1;
481 }
483 /* Initialize addr struct to INADDR_ANY. */
484 static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port)
485 {
486 memset(addr, 0x00, sizeof(union sctp_addr));
487 addr->v6.sin6_family = AF_INET6;
488 addr->v6.sin6_port = port;
489 }
491 /* Is this a wildcard address? */
492 static int sctp_v6_is_any(const union sctp_addr *addr)
493 {
494 return ipv6_addr_any(&addr->v6.sin6_addr);
495 }
497 /* Should this be available for binding? */
498 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
499 {
500 int type;
501 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
503 type = ipv6_addr_type(in6);
504 if (IPV6_ADDR_ANY == type)
505 return 1;
506 if (type == IPV6_ADDR_MAPPED) {
507 if (sp && !sp->v4mapped)
508 return 0;
509 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
510 return 0;
511 sctp_v6_map_v4(addr);
512 return sctp_get_af_specific(AF_INET)->available(addr, sp);
513 }
514 if (!(type & IPV6_ADDR_UNICAST))
515 return 0;
517 return ipv6_chk_addr(in6, NULL, 0);
518 }
520 /* This function checks if the address is a valid address to be used for
521 * SCTP.
522 *
523 * Output:
524 * Return 0 - If the address is a non-unicast or an illegal address.
525 * Return 1 - If the address is a unicast.
526 */
527 static int sctp_v6_addr_valid(union sctp_addr *addr,
528 struct sctp_sock *sp,
529 const struct sk_buff *skb)
530 {
531 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
533 /* Support v4-mapped-v6 address. */
534 if (ret == IPV6_ADDR_MAPPED) {
535 /* Note: This routine is used in input, so v4-mapped-v6
536 * are disallowed here when there is no sctp_sock.
537 */
538 if (!sp || !sp->v4mapped)
539 return 0;
540 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
541 return 0;
542 sctp_v6_map_v4(addr);
543 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
544 }
546 /* Is this a non-unicast address */
547 if (!(ret & IPV6_ADDR_UNICAST))
548 return 0;
550 return 1;
551 }
553 /* What is the scope of 'addr'? */
554 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
555 {
556 int v6scope;
557 sctp_scope_t retval;
559 /* The IPv6 scope is really a set of bit fields.
560 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
561 */
563 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
564 switch (v6scope) {
565 case IFA_HOST:
566 retval = SCTP_SCOPE_LOOPBACK;
567 break;
568 case IFA_LINK:
569 retval = SCTP_SCOPE_LINK;
570 break;
571 case IFA_SITE:
572 retval = SCTP_SCOPE_PRIVATE;
573 break;
574 default:
575 retval = SCTP_SCOPE_GLOBAL;
576 break;
577 };
579 return retval;
580 }
582 /* Create and initialize a new sk for the socket to be returned by accept(). */
583 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
584 struct sctp_association *asoc)
585 {
586 struct inet_sock *inet = inet_sk(sk);
587 struct sock *newsk;
588 struct inet_sock *newinet;
589 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
590 struct sctp6_sock *newsctp6sk;
592 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
593 if (!newsk)
594 goto out;
596 sock_init_data(NULL, newsk);
598 newsk->sk_type = SOCK_STREAM;
600 newsk->sk_prot = sk->sk_prot;
601 newsk->sk_no_check = sk->sk_no_check;
602 newsk->sk_reuse = sk->sk_reuse;
604 newsk->sk_destruct = inet_sock_destruct;
605 newsk->sk_family = PF_INET6;
606 newsk->sk_protocol = IPPROTO_SCTP;
607 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
608 newsk->sk_shutdown = sk->sk_shutdown;
609 sock_reset_flag(sk, SOCK_ZAPPED);
611 newsctp6sk = (struct sctp6_sock *)newsk;
612 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
614 newinet = inet_sk(newsk);
615 newnp = inet6_sk(newsk);
617 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
619 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
620 * and getpeername().
621 */
622 newinet->sport = inet->sport;
623 newnp->saddr = np->saddr;
624 newnp->rcv_saddr = np->rcv_saddr;
625 newinet->dport = htons(asoc->peer.port);
626 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
628 /* Init the ipv4 part of the socket since we can have sockets
629 * using v6 API for ipv4.
630 */
631 newinet->uc_ttl = -1;
632 newinet->mc_loop = 1;
633 newinet->mc_ttl = 1;
634 newinet->mc_index = 0;
635 newinet->mc_list = NULL;
637 if (ipv4_config.no_pmtu_disc)
638 newinet->pmtudisc = IP_PMTUDISC_DONT;
639 else
640 newinet->pmtudisc = IP_PMTUDISC_WANT;
642 sk_refcnt_debug_inc(newsk);
644 if (newsk->sk_prot->init(newsk)) {
645 sk_common_release(newsk);
646 newsk = NULL;
647 }
649 out:
650 return newsk;
651 }
653 /* Map v4 address to mapped v6 address */
654 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
655 {
656 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
657 sctp_v4_map_v6(addr);
658 }
660 /* Where did this skb come from? */
661 static int sctp_v6_skb_iif(const struct sk_buff *skb)
662 {
663 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
664 return opt->iif;
665 }
667 /* Was this packet marked by Explicit Congestion Notification? */
668 static int sctp_v6_is_ce(const struct sk_buff *skb)
669 {
670 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
671 }
673 /* Dump the v6 addr to the seq file. */
674 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
675 {
676 seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr));
677 }
679 /* Initialize a PF_INET6 socket msg_name. */
680 static void sctp_inet6_msgname(char *msgname, int *addr_len)
681 {
682 struct sockaddr_in6 *sin6;
684 sin6 = (struct sockaddr_in6 *)msgname;
685 sin6->sin6_family = AF_INET6;
686 sin6->sin6_flowinfo = 0;
687 sin6->sin6_scope_id = 0; /*FIXME */
688 *addr_len = sizeof(struct sockaddr_in6);
689 }
691 /* Initialize a PF_INET msgname from a ulpevent. */
692 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
693 char *msgname, int *addrlen)
694 {
695 struct sockaddr_in6 *sin6, *sin6from;
697 if (msgname) {
698 union sctp_addr *addr;
699 struct sctp_association *asoc;
701 asoc = event->asoc;
702 sctp_inet6_msgname(msgname, addrlen);
703 sin6 = (struct sockaddr_in6 *)msgname;
704 sin6->sin6_port = htons(asoc->peer.port);
705 addr = &asoc->peer.primary_addr;
707 /* Note: If we go to a common v6 format, this code
708 * will change.
709 */
711 /* Map ipv4 address into v4-mapped-on-v6 address. */
712 if (sctp_sk(asoc->base.sk)->v4mapped &&
713 AF_INET == addr->sa.sa_family) {
714 sctp_v4_map_v6((union sctp_addr *)sin6);
715 sin6->sin6_addr.s6_addr32[3] =
716 addr->v4.sin_addr.s_addr;
717 return;
718 }
720 sin6from = &asoc->peer.primary_addr.v6;
721 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
722 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
723 sin6->sin6_scope_id = sin6from->sin6_scope_id;
724 }
725 }
727 /* Initialize a msg_name from an inbound skb. */
728 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
729 int *addr_len)
730 {
731 struct sctphdr *sh;
732 struct sockaddr_in6 *sin6;
734 if (msgname) {
735 sctp_inet6_msgname(msgname, addr_len);
736 sin6 = (struct sockaddr_in6 *)msgname;
737 sh = (struct sctphdr *)skb->h.raw;
738 sin6->sin6_port = sh->source;
740 /* Map ipv4 address into v4-mapped-on-v6 address. */
741 if (sctp_sk(skb->sk)->v4mapped &&
742 skb->nh.iph->version == 4) {
743 sctp_v4_map_v6((union sctp_addr *)sin6);
744 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
745 return;
746 }
748 /* Otherwise, just copy the v6 address. */
749 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
750 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
751 struct sctp_ulpevent *ev = sctp_skb2event(skb);
752 sin6->sin6_scope_id = ev->iif;
753 }
754 }
755 }
757 /* Do we support this AF? */
758 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
759 {
760 switch (family) {
761 case AF_INET6:
762 return 1;
763 /* v4-mapped-v6 addresses */
764 case AF_INET:
765 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
766 return 1;
767 default:
768 return 0;
769 }
770 }
772 /* Address matching with wildcards allowed. This extra level
773 * of indirection lets us choose whether a PF_INET6 should
774 * disallow any v4 addresses if we so choose.
775 */
776 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
777 const union sctp_addr *addr2,
778 struct sctp_sock *opt)
779 {
780 struct sctp_af *af1, *af2;
782 af1 = sctp_get_af_specific(addr1->sa.sa_family);
783 af2 = sctp_get_af_specific(addr2->sa.sa_family);
785 if (!af1 || !af2)
786 return 0;
787 /* Today, wildcard AF_INET/AF_INET6. */
788 if (sctp_is_any(addr1) || sctp_is_any(addr2))
789 return 1;
791 if (addr1->sa.sa_family != addr2->sa.sa_family)
792 return 0;
794 return af1->cmp_addr(addr1, addr2);
795 }
797 /* Verify that the provided sockaddr looks bindable. Common verification,
798 * has already been taken care of.
799 */
800 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
801 {
802 struct sctp_af *af;
804 /* ASSERT: address family has already been verified. */
805 if (addr->sa.sa_family != AF_INET6)
806 af = sctp_get_af_specific(addr->sa.sa_family);
807 else {
808 int type = ipv6_addr_type(&addr->v6.sin6_addr);
809 struct net_device *dev;
811 if (type & IPV6_ADDR_LINKLOCAL) {
812 if (!addr->v6.sin6_scope_id)
813 return 0;
814 dev = dev_get_by_index(addr->v6.sin6_scope_id);
815 if (!dev)
816 return 0;
817 dev_put(dev);
818 }
819 af = opt->pf->af;
820 }
821 return af->available(addr, opt);
822 }
824 /* Verify that the provided sockaddr looks sendable. Common verification,
825 * has already been taken care of.
826 */
827 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
828 {
829 struct sctp_af *af = NULL;
831 /* ASSERT: address family has already been verified. */
832 if (addr->sa.sa_family != AF_INET6)
833 af = sctp_get_af_specific(addr->sa.sa_family);
834 else {
835 int type = ipv6_addr_type(&addr->v6.sin6_addr);
836 struct net_device *dev;
838 if (type & IPV6_ADDR_LINKLOCAL) {
839 if (!addr->v6.sin6_scope_id)
840 return 0;
841 dev = dev_get_by_index(addr->v6.sin6_scope_id);
842 if (!dev)
843 return 0;
844 dev_put(dev);
845 }
846 af = opt->pf->af;
847 }
849 return af != NULL;
850 }
852 /* Fill in Supported Address Type information for INIT and INIT-ACK
853 * chunks. Note: In the future, we may want to look at sock options
854 * to determine whether a PF_INET6 socket really wants to have IPV4
855 * addresses.
856 * Returns number of addresses supported.
857 */
858 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
859 __u16 *types)
860 {
861 types[0] = SCTP_PARAM_IPV4_ADDRESS;
862 types[1] = SCTP_PARAM_IPV6_ADDRESS;
863 return 2;
864 }
866 static const struct proto_ops inet6_seqpacket_ops = {
867 .family = PF_INET6,
868 .owner = THIS_MODULE,
869 .release = inet6_release,
870 .bind = inet6_bind,
871 .connect = inet_dgram_connect,
872 .socketpair = sock_no_socketpair,
873 .accept = inet_accept,
874 .getname = inet6_getname,
875 .poll = sctp_poll,
876 .ioctl = inet6_ioctl,
877 .listen = sctp_inet_listen,
878 .shutdown = inet_shutdown,
879 .setsockopt = sock_common_setsockopt,
880 .getsockopt = sock_common_getsockopt,
881 .sendmsg = inet_sendmsg,
882 .recvmsg = sock_common_recvmsg,
883 .mmap = sock_no_mmap,
884 #ifdef CONFIG_COMPAT
885 .compat_setsockopt = compat_sock_common_setsockopt,
886 .compat_getsockopt = compat_sock_common_getsockopt,
887 #endif
888 };
890 static struct inet_protosw sctpv6_seqpacket_protosw = {
891 .type = SOCK_SEQPACKET,
892 .protocol = IPPROTO_SCTP,
893 .prot = &sctpv6_prot,
894 .ops = &inet6_seqpacket_ops,
895 .capability = -1,
896 .no_check = 0,
897 .flags = SCTP_PROTOSW_FLAG
898 };
899 static struct inet_protosw sctpv6_stream_protosw = {
900 .type = SOCK_STREAM,
901 .protocol = IPPROTO_SCTP,
902 .prot = &sctpv6_prot,
903 .ops = &inet6_seqpacket_ops,
904 .capability = -1,
905 .no_check = 0,
906 .flags = SCTP_PROTOSW_FLAG,
907 };
909 static int sctp6_rcv(struct sk_buff **pskb)
910 {
911 return sctp_rcv(*pskb) ? -1 : 0;
912 }
914 static struct inet6_protocol sctpv6_protocol = {
915 .handler = sctp6_rcv,
916 .err_handler = sctp_v6_err,
917 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
918 };
920 static struct sctp_af sctp_ipv6_specific = {
921 .sa_family = AF_INET6,
922 .sctp_xmit = sctp_v6_xmit,
923 .setsockopt = ipv6_setsockopt,
924 .getsockopt = ipv6_getsockopt,
925 .get_dst = sctp_v6_get_dst,
926 .get_saddr = sctp_v6_get_saddr,
927 .copy_addrlist = sctp_v6_copy_addrlist,
928 .from_skb = sctp_v6_from_skb,
929 .from_sk = sctp_v6_from_sk,
930 .to_sk_saddr = sctp_v6_to_sk_saddr,
931 .to_sk_daddr = sctp_v6_to_sk_daddr,
932 .from_addr_param = sctp_v6_from_addr_param,
933 .to_addr_param = sctp_v6_to_addr_param,
934 .dst_saddr = sctp_v6_dst_saddr,
935 .cmp_addr = sctp_v6_cmp_addr,
936 .scope = sctp_v6_scope,
937 .addr_valid = sctp_v6_addr_valid,
938 .inaddr_any = sctp_v6_inaddr_any,
939 .is_any = sctp_v6_is_any,
940 .available = sctp_v6_available,
941 .skb_iif = sctp_v6_skb_iif,
942 .is_ce = sctp_v6_is_ce,
943 .seq_dump_addr = sctp_v6_seq_dump_addr,
944 .net_header_len = sizeof(struct ipv6hdr),
945 .sockaddr_len = sizeof(struct sockaddr_in6),
946 #ifdef CONFIG_COMPAT
947 .compat_setsockopt = compat_ipv6_setsockopt,
948 .compat_getsockopt = compat_ipv6_getsockopt,
949 #endif
950 };
952 static struct sctp_pf sctp_pf_inet6_specific = {
953 .event_msgname = sctp_inet6_event_msgname,
954 .skb_msgname = sctp_inet6_skb_msgname,
955 .af_supported = sctp_inet6_af_supported,
956 .cmp_addr = sctp_inet6_cmp_addr,
957 .bind_verify = sctp_inet6_bind_verify,
958 .send_verify = sctp_inet6_send_verify,
959 .supported_addrs = sctp_inet6_supported_addrs,
960 .create_accept_sk = sctp_v6_create_accept_sk,
961 .addr_v4map = sctp_v6_addr_v4map,
962 .af = &sctp_ipv6_specific,
963 };
965 /* Initialize IPv6 support and register with inet6 stack. */
966 int sctp_v6_init(void)
967 {
968 int rc = proto_register(&sctpv6_prot, 1);
970 if (rc)
971 goto out;
972 /* Register inet6 protocol. */
973 rc = -EAGAIN;
974 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
975 goto out_unregister_sctp_proto;
977 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
978 inet6_register_protosw(&sctpv6_seqpacket_protosw);
979 inet6_register_protosw(&sctpv6_stream_protosw);
981 /* Register the SCTP specific PF_INET6 functions. */
982 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
984 /* Register the SCTP specific AF_INET6 functions. */
985 sctp_register_af(&sctp_ipv6_specific);
987 /* Register notifier for inet6 address additions/deletions. */
988 register_inet6addr_notifier(&sctp_inet6addr_notifier);
989 rc = 0;
990 out:
991 return rc;
992 out_unregister_sctp_proto:
993 proto_unregister(&sctpv6_prot);
994 goto out;
995 }
997 /* IPv6 specific exit support. */
998 void sctp_v6_exit(void)
999 {
1000 list_del(&sctp_ipv6_specific.list);
1001 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1002 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1003 inet6_unregister_protosw(&sctpv6_stream_protosw);
1004 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1005 proto_unregister(&sctpv6_prot);