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[SCTP] Add support for ip_nonlocal_bind sysctl & IP_FREEBIND socket option
[linux-2.6-block.git] / net / sctp / ipv6.c
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1da177e4
LT		 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 */
49
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>
62
63#include <linux/ipv6.h>
64#include <linux/icmpv6.h>
65#include <linux/random.h>
66#include <linux/seq_file.h>
67
68#include <net/protocol.h>
69#include <net/tcp.h>
70#include <net/ndisc.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>
78
79#include <asm/uaccess.h>
80
81extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *);
82static struct notifier_block sctp_inet6addr_notifier = {
83 .notifier_call = sctp_inetaddr_event,
84};
85
86/* ICMP error handler. */
87SCTP_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_endpoint *ep;
95 struct sctp_association *asoc;
96 struct sctp_transport *transport;
97 struct ipv6_pinfo *np;
98 char *saveip, *savesctp;
99 int err;
100
101 idev = in6_dev_get(skb->dev);
102
103 /* Fix up skb to look at the embedded net header. */
104 saveip = skb->nh.raw;
105 savesctp = skb->h.raw;
106 skb->nh.ipv6h = iph;
107 skb->h.raw = (char *)sh;
108 sk = sctp_err_lookup(AF_INET6, skb, sh, &ep, &asoc, &transport);
109 /* Put back, the original pointers. */
110 skb->nh.raw = saveip;
111 skb->h.raw = savesctp;
112 if (!sk) {
113 ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
114 goto out;
115 }
116
117 /* Warning: The sock lock is held. Remember to call
118 * sctp_err_finish!
119 */
120
121 switch (type) {
122 case ICMPV6_PKT_TOOBIG:
123 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
124 goto out_unlock;
125 case ICMPV6_PARAMPROB:
126 if (ICMPV6_UNK_NEXTHDR == code) {
127 sctp_icmp_proto_unreachable(sk, ep, asoc, transport);
128 goto out_unlock;
129 }
130 break;
131 default:
132 break;
133 }
134
135 np = inet6_sk(sk);
136 icmpv6_err_convert(type, code, &err);
137 if (!sock_owned_by_user(sk) && np->recverr) {
138 sk->sk_err = err;
139 sk->sk_error_report(sk);
140 } else { /* Only an error on timeout */
141 sk->sk_err_soft = err;
142 }
143
144out_unlock:
145 sctp_err_finish(sk, ep, asoc);
146out:
147 if (likely(idev != NULL))
148 in6_dev_put(idev);
149}
150
151/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
152static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
153 int ipfragok)
154{
155 struct sock *sk = skb->sk;
156 struct ipv6_pinfo *np = inet6_sk(sk);
157 struct flowi fl;
158
159 memset(&fl, 0, sizeof(fl));
160
161 fl.proto = sk->sk_protocol;
162
163 /* Fill in the dest address from the route entry passed with the skb
164 * and the source address from the transport.
165 */
166 ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
167 ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
168
169 fl.fl6_flowlabel = np->flow_label;
170 IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
171 if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
172 fl.oif = transport->saddr.v6.sin6_scope_id;
173 else
174 fl.oif = sk->sk_bound_dev_if;
175 fl.fl_ip_sport = inet_sk(sk)->sport;
176 fl.fl_ip_dport = transport->ipaddr.v6.sin6_port;
177
178 if (np->opt && np->opt->srcrt) {
179 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
180 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
181 }
182
183 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
184 "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
185 "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
186 __FUNCTION__, skb, skb->len,
187 NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
188
189 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
190
191 return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
192}
193
194/* Returns the dst cache entry for the given source and destination ip
195 * addresses.
196 */
197static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
198 union sctp_addr *daddr,
199 union sctp_addr *saddr)
200{
201 struct dst_entry *dst;
202 struct flowi fl;
203
204 memset(&fl, 0, sizeof(fl));
205 ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
206 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
207 fl.oif = daddr->v6.sin6_scope_id;
208
209
210 SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
211 __FUNCTION__, NIP6(fl.fl6_dst));
212
213 if (saddr) {
214 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
215 SCTP_DEBUG_PRINTK(
216 "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ",
217 NIP6(fl.fl6_src));
218 }
219
220 dst = ip6_route_output(NULL, &fl);
221 if (dst) {
222 struct rt6_info *rt;
223 rt = (struct rt6_info *)dst;
224 SCTP_DEBUG_PRINTK(
225 "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
226 "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
227 NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
228 } else {
229 SCTP_DEBUG_PRINTK("NO ROUTE\n");
230 }
231
232 return dst;
233}
234
235/* Returns the number of consecutive initial bits that match in the 2 ipv6
236 * addresses.
237 */
238static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
239 union sctp_addr *s2)
240{
241 struct in6_addr *a1 = &s1->v6.sin6_addr;
242 struct in6_addr *a2 = &s2->v6.sin6_addr;
243 int i, j;
244
245 for (i = 0; i < 4 ; i++) {
246 __u32 a1xora2;
247
248 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
249
250 if ((j = fls(ntohl(a1xora2))))
251 return (i * 32 + 32 - j);
252 }
253
254 return (i*32);
255}
256
257/* Fills in the source address(saddr) based on the destination address(daddr)
258 * and asoc's bind address list.
259 */
260static void sctp_v6_get_saddr(struct sctp_association *asoc,
261 struct dst_entry *dst,
262 union sctp_addr *daddr,
263 union sctp_addr *saddr)
264{
265 struct sctp_bind_addr *bp;
266 rwlock_t *addr_lock;
267 struct sctp_sockaddr_entry *laddr;
268 struct list_head *pos;
269 sctp_scope_t scope;
270 union sctp_addr *baddr = NULL;
271 __u8 matchlen = 0;
272 __u8 bmatchlen;
273
274 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
275 "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
276 __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
277
278 if (!asoc) {
279 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
280 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: "
281 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
282 NIP6(saddr->v6.sin6_addr));
283 return;
284 }
285
286 scope = sctp_scope(daddr);
287
288 bp = &asoc->base.bind_addr;
289 addr_lock = &asoc->base.addr_lock;
290
291 /* Go through the bind address list and find the best source address
292 * that matches the scope of the destination address.
293 */
294 sctp_read_lock(addr_lock);
295 list_for_each(pos, &bp->address_list) {
296 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
297 if ((laddr->a.sa.sa_family == AF_INET6) &&
298 (scope <= sctp_scope(&laddr->a))) {
299 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
300 if (!baddr || (matchlen < bmatchlen)) {
301 baddr = &laddr->a;
302 matchlen = bmatchlen;
303 }
304 }
305 }
306
307 if (baddr) {
308 memcpy(saddr, baddr, sizeof(union sctp_addr));
309 SCTP_DEBUG_PRINTK("saddr: "
310 "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
311 NIP6(saddr->v6.sin6_addr));
312 } else {
313 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
314 "address for the "
315 "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
316 __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
317 }
318
319 sctp_read_unlock(addr_lock);
320}
321
322/* Make a copy of all potential local addresses. */
323static void sctp_v6_copy_addrlist(struct list_head *addrlist,
324 struct net_device *dev)
325{
326 struct inet6_dev *in6_dev;
327 struct inet6_ifaddr *ifp;
328 struct sctp_sockaddr_entry *addr;
329
330 read_lock(&addrconf_lock);
331 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
332 read_unlock(&addrconf_lock);
333 return;
334 }
335
336 read_lock(&in6_dev->lock);
337 for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
338 /* Add the address to the local list. */
339 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
340 if (addr) {
341 addr->a.v6.sin6_family = AF_INET6;
342 addr->a.v6.sin6_port = 0;
343 addr->a.v6.sin6_addr = ifp->addr;
344 addr->a.v6.sin6_scope_id = dev->ifindex;
345 INIT_LIST_HEAD(&addr->list);
346 list_add_tail(&addr->list, addrlist);
347 }
348 }
349
350 read_unlock(&in6_dev->lock);
351 read_unlock(&addrconf_lock);
352}
353
354/* Initialize a sockaddr_storage from in incoming skb. */
355static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
356 int is_saddr)
357{
358 void *from;
359 __u16 *port;
360 struct sctphdr *sh;
361
362 port = &addr->v6.sin6_port;
363 addr->v6.sin6_family = AF_INET6;
364 addr->v6.sin6_flowinfo = 0; /* FIXME */
365 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
366
367 sh = (struct sctphdr *) skb->h.raw;
368 if (is_saddr) {
369 *port = ntohs(sh->source);
370 from = &skb->nh.ipv6h->saddr;
371 } else {
372 *port = ntohs(sh->dest);
373 from = &skb->nh.ipv6h->daddr;
374 }
375 ipv6_addr_copy(&addr->v6.sin6_addr, from);
376}
377
378/* Initialize an sctp_addr from a socket. */
379static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
380{
381 addr->v6.sin6_family = AF_INET6;
382 addr->v6.sin6_port = inet_sk(sk)->num;
383 addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
384}
385
386/* Initialize sk->sk_rcv_saddr from sctp_addr. */
387static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
388{
389 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
390 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
391 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
392 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
393 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
394 addr->v4.sin_addr.s_addr;
395 } else {
396 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
397 }
398}
399
400/* Initialize sk->sk_daddr from sctp_addr. */
401static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
402{
403 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
404 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
405 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
406 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
407 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
408 } else {
409 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
410 }
411}
412
413/* Initialize a sctp_addr from an address parameter. */
414static void sctp_v6_from_addr_param(union sctp_addr *addr,
415 union sctp_addr_param *param,
416 __u16 port, int iif)
417{
418 addr->v6.sin6_family = AF_INET6;
419 addr->v6.sin6_port = port;
420 addr->v6.sin6_flowinfo = 0; /* BUG */
421 ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
422 addr->v6.sin6_scope_id = iif;
423}
424
425/* Initialize an address parameter from a sctp_addr and return the length
426 * of the address parameter.
427 */
428static int sctp_v6_to_addr_param(const union sctp_addr *addr,
429 union sctp_addr_param *param)
430{
431 int length = sizeof(sctp_ipv6addr_param_t);
432
433 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
434 param->v6.param_hdr.length = ntohs(length);
435 ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
436
437 return length;
438}
439
440/* Initialize a sctp_addr from a dst_entry. */
441static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
442 unsigned short port)
443{
444 struct rt6_info *rt = (struct rt6_info *)dst;
445 addr->sa.sa_family = AF_INET6;
446 addr->v6.sin6_port = port;
447 ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
448}
449
450/* Compare addresses exactly.
451 * v4-mapped-v6 is also in consideration.
452 */
453static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
454 const union sctp_addr *addr2)
455{
456 if (addr1->sa.sa_family != addr2->sa.sa_family) {
457 if (addr1->sa.sa_family == AF_INET &&
458 addr2->sa.sa_family == AF_INET6 &&
459 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
460 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
461 addr2->v6.sin6_addr.s6_addr32[3] ==
462 addr1->v4.sin_addr.s_addr)
463 return 1;
464 }
465 if (addr2->sa.sa_family == AF_INET &&
466 addr1->sa.sa_family == AF_INET6 &&
467 IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
468 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
469 addr1->v6.sin6_addr.s6_addr32[3] ==
470 addr2->v4.sin_addr.s_addr)
471 return 1;
472 }
473 return 0;
474 }
475 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
476 return 0;
477 /* If this is a linklocal address, compare the scope_id. */
478 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
479 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
480 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
481 return 0;
482 }
483 }
484
485 return 1;
486}
487
488/* Initialize addr struct to INADDR_ANY. */
489static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port)
490{
491 memset(addr, 0x00, sizeof(union sctp_addr));
492 addr->v6.sin6_family = AF_INET6;
493 addr->v6.sin6_port = port;
494}
495
496/* Is this a wildcard address? */
497static int sctp_v6_is_any(const union sctp_addr *addr)
498{
b9b9e10f 499 return ipv6_addr_any(&addr->v6.sin6_addr);
1da177e4
LT		 500}
501
502/* Should this be available for binding? */
503static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
504{
505 int type;
506 struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
507
508 type = ipv6_addr_type(in6);
509 if (IPV6_ADDR_ANY == type)
510 return 1;
511 if (type == IPV6_ADDR_MAPPED) {
512 if (sp && !sp->v4mapped)
513 return 0;
514 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
515 return 0;
516 sctp_v6_map_v4(addr);
517 return sctp_get_af_specific(AF_INET)->available(addr, sp);
518 }
519 if (!(type & IPV6_ADDR_UNICAST))
520 return 0;
521
522 return ipv6_chk_addr(in6, NULL, 0);
523}
524
525/* This function checks if the address is a valid address to be used for
526 * SCTP.
527 *
528 * Output:
529 * Return 0 - If the address is a non-unicast or an illegal address.
530 * Return 1 - If the address is a unicast.
531 */
532static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
533{
534 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
535
536 /* Support v4-mapped-v6 address. */
537 if (ret == IPV6_ADDR_MAPPED) {
538 /* Note: This routine is used in input, so v4-mapped-v6
539 * are disallowed here when there is no sctp_sock.
540 */
541 if (!sp || !sp->v4mapped)
542 return 0;
543 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
544 return 0;
545 sctp_v6_map_v4(addr);
546 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp);
547 }
548
549 /* Is this a non-unicast address */
550 if (!(ret & IPV6_ADDR_UNICAST))
551 return 0;
552
553 return 1;
554}
555
556/* What is the scope of 'addr'? */
557static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
558{
559 int v6scope;
560 sctp_scope_t retval;
561
562 /* The IPv6 scope is really a set of bit fields.
563 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
564 */
565
566 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
567 switch (v6scope) {
568 case IFA_HOST:
569 retval = SCTP_SCOPE_LOOPBACK;
570 break;
571 case IFA_LINK:
572 retval = SCTP_SCOPE_LINK;
573 break;
574 case IFA_SITE:
575 retval = SCTP_SCOPE_PRIVATE;
576 break;
577 default:
578 retval = SCTP_SCOPE_GLOBAL;
579 break;
580 };
581
582 return retval;
583}
584
585/* Create and initialize a new sk for the socket to be returned by accept(). */
586static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
587 struct sctp_association *asoc)
588{
589 struct inet_sock *inet = inet_sk(sk);
590 struct sock *newsk;
591 struct inet_sock *newinet;
592 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
593 struct sctp6_sock *newsctp6sk;
594
595 newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
596 if (!newsk)
597 goto out;
598
599 sock_init_data(NULL, newsk);
600
601 newsk->sk_type = SOCK_STREAM;
602
603 newsk->sk_prot = sk->sk_prot;
604 newsk->sk_no_check = sk->sk_no_check;
605 newsk->sk_reuse = sk->sk_reuse;
606
607 newsk->sk_destruct = inet_sock_destruct;
608 newsk->sk_family = PF_INET6;
609 newsk->sk_protocol = IPPROTO_SCTP;
610 newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
611 newsk->sk_shutdown = sk->sk_shutdown;
612 sock_reset_flag(sk, SOCK_ZAPPED);
613
614 newsctp6sk = (struct sctp6_sock *)newsk;
615 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
616
617 newinet = inet_sk(newsk);
618 newnp = inet6_sk(newsk);
619
620 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
621
622 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
623 * and getpeername().
624 */
625 newinet->sport = inet->sport;
626 newnp->saddr = np->saddr;
627 newnp->rcv_saddr = np->rcv_saddr;
628 newinet->dport = htons(asoc->peer.port);
629 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
630
631 /* Init the ipv4 part of the socket since we can have sockets
632 * using v6 API for ipv4.
633 */
634 newinet->uc_ttl = -1;
635 newinet->mc_loop = 1;
636 newinet->mc_ttl = 1;
637 newinet->mc_index = 0;
638 newinet->mc_list = NULL;
639
640 if (ipv4_config.no_pmtu_disc)
641 newinet->pmtudisc = IP_PMTUDISC_DONT;
642 else
643 newinet->pmtudisc = IP_PMTUDISC_WANT;
644
645#ifdef INET_REFCNT_DEBUG
646 atomic_inc(&inet6_sock_nr);
647 atomic_inc(&inet_sock_nr);
648#endif
649
650 if (newsk->sk_prot->init(newsk)) {
651 sk_common_release(newsk);
652 newsk = NULL;
653 }
654
655out:
656 return newsk;
657}
658
659/* Map v4 address to mapped v6 address */
660static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
661{
662 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
663 sctp_v4_map_v6(addr);
664}
665
666/* Where did this skb come from? */
667static int sctp_v6_skb_iif(const struct sk_buff *skb)
668{
669 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
670 return opt->iif;
671}
672
673/* Was this packet marked by Explicit Congestion Notification? */
674static int sctp_v6_is_ce(const struct sk_buff *skb)
675{
676 return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
677}
678
679/* Dump the v6 addr to the seq file. */
680static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
681{
682 seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
683 NIP6(addr->v6.sin6_addr));
684}
685
686/* Initialize a PF_INET6 socket msg_name. */
687static void sctp_inet6_msgname(char *msgname, int *addr_len)
688{
689 struct sockaddr_in6 *sin6;
690
691 sin6 = (struct sockaddr_in6 *)msgname;
692 sin6->sin6_family = AF_INET6;
693 sin6->sin6_flowinfo = 0;
694 sin6->sin6_scope_id = 0; /*FIXME */
695 *addr_len = sizeof(struct sockaddr_in6);
696}
697
698/* Initialize a PF_INET msgname from a ulpevent. */
699static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
700 char *msgname, int *addrlen)
701{
702 struct sockaddr_in6 *sin6, *sin6from;
703
704 if (msgname) {
705 union sctp_addr *addr;
706 struct sctp_association *asoc;
707
708 asoc = event->asoc;
709 sctp_inet6_msgname(msgname, addrlen);
710 sin6 = (struct sockaddr_in6 *)msgname;
711 sin6->sin6_port = htons(asoc->peer.port);
712 addr = &asoc->peer.primary_addr;
713
714 /* Note: If we go to a common v6 format, this code
715 * will change.
716 */
717
718 /* Map ipv4 address into v4-mapped-on-v6 address. */
719 if (sctp_sk(asoc->base.sk)->v4mapped &&
720 AF_INET == addr->sa.sa_family) {
721 sctp_v4_map_v6((union sctp_addr *)sin6);
722 sin6->sin6_addr.s6_addr32[3] =
723 addr->v4.sin_addr.s_addr;
724 return;
725 }
726
727 sin6from = &asoc->peer.primary_addr.v6;
728 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
729 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
730 sin6->sin6_scope_id = sin6from->sin6_scope_id;
731 }
732}
733
734/* Initialize a msg_name from an inbound skb. */
735static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
736 int *addr_len)
737{
738 struct sctphdr *sh;
739 struct sockaddr_in6 *sin6;
740
741 if (msgname) {
742 sctp_inet6_msgname(msgname, addr_len);
743 sin6 = (struct sockaddr_in6 *)msgname;
744 sh = (struct sctphdr *)skb->h.raw;
745 sin6->sin6_port = sh->source;
746
747 /* Map ipv4 address into v4-mapped-on-v6 address. */
748 if (sctp_sk(skb->sk)->v4mapped &&
749 skb->nh.iph->version == 4) {
750 sctp_v4_map_v6((union sctp_addr *)sin6);
751 sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
752 return;
753 }
754
755 /* Otherwise, just copy the v6 address. */
756 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
757 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
758 struct sctp_ulpevent *ev = sctp_skb2event(skb);
759 sin6->sin6_scope_id = ev->iif;
760 }
761 }
762}
763
764/* Do we support this AF? */
765static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
766{
767 switch (family) {
768 case AF_INET6:
769 return 1;
770 /* v4-mapped-v6 addresses */
771 case AF_INET:
772 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
773 return 1;
774 default:
775 return 0;
776 }
777}
778
779/* Address matching with wildcards allowed. This extra level
780 * of indirection lets us choose whether a PF_INET6 should
781 * disallow any v4 addresses if we so choose.
782 */
783static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
784 const union sctp_addr *addr2,
785 struct sctp_sock *opt)
786{
787 struct sctp_af *af1, *af2;
788
789 af1 = sctp_get_af_specific(addr1->sa.sa_family);
790 af2 = sctp_get_af_specific(addr2->sa.sa_family);
791
792 if (!af1 || !af2)
793 return 0;
794 /* Today, wildcard AF_INET/AF_INET6. */
795 if (sctp_is_any(addr1) || sctp_is_any(addr2))
796 return 1;
797
798 if (addr1->sa.sa_family != addr2->sa.sa_family)
799 return 0;
800
801 return af1->cmp_addr(addr1, addr2);
802}
803
804/* Verify that the provided sockaddr looks bindable. Common verification,
805 * has already been taken care of.
806 */
807static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
808{
809 struct sctp_af *af;
810
811 /* ASSERT: address family has already been verified. */
812 if (addr->sa.sa_family != AF_INET6)
813 af = sctp_get_af_specific(addr->sa.sa_family);
814 else {
815 struct sock *sk;
816 int type = ipv6_addr_type(&addr->v6.sin6_addr);
817 sk = sctp_opt2sk(opt);
818 if (type & IPV6_ADDR_LINKLOCAL) {
819 /* Note: Behavior similar to af_inet6.c:
820 * 1) Overrides previous bound_dev_if
821 * 2) Destructive even if bind isn't successful.
822 */
823
824 if (addr->v6.sin6_scope_id)
825 sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
826 if (!sk->sk_bound_dev_if)
827 return 0;
828 }
829 af = opt->pf->af;
830 }
831 return af->available(addr, opt);
832}
833
834/* Verify that the provided sockaddr looks bindable. Common verification,
835 * has already been taken care of.
836 */
837static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
838{
839 struct sctp_af *af = NULL;
840
841 /* ASSERT: address family has already been verified. */
842 if (addr->sa.sa_family != AF_INET6)
843 af = sctp_get_af_specific(addr->sa.sa_family);
844 else {
845 struct sock *sk;
846 int type = ipv6_addr_type(&addr->v6.sin6_addr);
847 sk = sctp_opt2sk(opt);
848 if (type & IPV6_ADDR_LINKLOCAL) {
849 /* Note: Behavior similar to af_inet6.c:
850 * 1) Overrides previous bound_dev_if
851 * 2) Destructive even if bind isn't successful.
852 */
853
854 if (addr->v6.sin6_scope_id)
855 sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
856 if (!sk->sk_bound_dev_if)
857 return 0;
858 }
859 af = opt->pf->af;
860 }
861
862 return af != NULL;
863}
864
865/* Fill in Supported Address Type information for INIT and INIT-ACK
866 * chunks. Note: In the future, we may want to look at sock options
867 * to determine whether a PF_INET6 socket really wants to have IPV4
868 * addresses.
869 * Returns number of addresses supported.
870 */
871static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
872 __u16 *types)
873{
874 types[0] = SCTP_PARAM_IPV4_ADDRESS;
875 types[1] = SCTP_PARAM_IPV6_ADDRESS;
876 return 2;
877}
878
879static struct proto_ops inet6_seqpacket_ops = {
880 .family = PF_INET6,
881 .owner = THIS_MODULE,
882 .release = inet6_release,
883 .bind = inet6_bind,
884 .connect = inet_dgram_connect,
885 .socketpair = sock_no_socketpair,
886 .accept = inet_accept,
887 .getname = inet6_getname,
888 .poll = sctp_poll,
889 .ioctl = inet6_ioctl,
890 .listen = sctp_inet_listen,
891 .shutdown = inet_shutdown,
892 .setsockopt = sock_common_setsockopt,
893 .getsockopt = sock_common_getsockopt,
894 .sendmsg = inet_sendmsg,
895 .recvmsg = sock_common_recvmsg,
896 .mmap = sock_no_mmap,
897};
898
899static struct inet_protosw sctpv6_seqpacket_protosw = {
900 .type = SOCK_SEQPACKET,
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};
908static struct inet_protosw sctpv6_stream_protosw = {
909 .type = SOCK_STREAM,
910 .protocol = IPPROTO_SCTP,
911 .prot = &sctpv6_prot,
912 .ops = &inet6_seqpacket_ops,
913 .capability = -1,
914 .no_check = 0,
915 .flags = SCTP_PROTOSW_FLAG,
916};
917
918static int sctp6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
919{
920 return sctp_rcv(*pskb) ? -1 : 0;
921}
922
923static struct inet6_protocol sctpv6_protocol = {
924 .handler = sctp6_rcv,
925 .err_handler = sctp_v6_err,
926 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
927};
928
929static struct sctp_af sctp_ipv6_specific = {
930 .sctp_xmit = sctp_v6_xmit,
931 .setsockopt = ipv6_setsockopt,
932 .getsockopt = ipv6_getsockopt,
933 .get_dst = sctp_v6_get_dst,
934 .get_saddr = sctp_v6_get_saddr,
935 .copy_addrlist = sctp_v6_copy_addrlist,
936 .from_skb = sctp_v6_from_skb,
937 .from_sk = sctp_v6_from_sk,
938 .to_sk_saddr = sctp_v6_to_sk_saddr,
939 .to_sk_daddr = sctp_v6_to_sk_daddr,
940 .from_addr_param = sctp_v6_from_addr_param,
941 .to_addr_param = sctp_v6_to_addr_param,
942 .dst_saddr = sctp_v6_dst_saddr,
943 .cmp_addr = sctp_v6_cmp_addr,
944 .scope = sctp_v6_scope,
945 .addr_valid = sctp_v6_addr_valid,
946 .inaddr_any = sctp_v6_inaddr_any,
947 .is_any = sctp_v6_is_any,
948 .available = sctp_v6_available,
949 .skb_iif = sctp_v6_skb_iif,
950 .is_ce = sctp_v6_is_ce,
951 .seq_dump_addr = sctp_v6_seq_dump_addr,
952 .net_header_len = sizeof(struct ipv6hdr),
953 .sockaddr_len = sizeof(struct sockaddr_in6),
954 .sa_family = AF_INET6,
955};
956
957static struct sctp_pf sctp_pf_inet6_specific = {
958 .event_msgname = sctp_inet6_event_msgname,
959 .skb_msgname = sctp_inet6_skb_msgname,
960 .af_supported = sctp_inet6_af_supported,
961 .cmp_addr = sctp_inet6_cmp_addr,
962 .bind_verify = sctp_inet6_bind_verify,
963 .send_verify = sctp_inet6_send_verify,
964 .supported_addrs = sctp_inet6_supported_addrs,
965 .create_accept_sk = sctp_v6_create_accept_sk,
966 .addr_v4map = sctp_v6_addr_v4map,
967 .af = &sctp_ipv6_specific,
968};
969
970/* Initialize IPv6 support and register with inet6 stack. */
971int sctp_v6_init(void)
972{
973 int rc = proto_register(&sctpv6_prot, 1);
974
975 if (rc)
976 goto out;
977 /* Register inet6 protocol. */
978 rc = -EAGAIN;
979 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
980 goto out_unregister_sctp_proto;
981
982 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
983 inet6_register_protosw(&sctpv6_seqpacket_protosw);
984 inet6_register_protosw(&sctpv6_stream_protosw);
985
986 /* Register the SCTP specific PF_INET6 functions. */
987 sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
988
989 /* Register the SCTP specific AF_INET6 functions. */
990 sctp_register_af(&sctp_ipv6_specific);
991
992 /* Register notifier for inet6 address additions/deletions. */
993 register_inet6addr_notifier(&sctp_inet6addr_notifier);
994 rc = 0;
995out:
996 return rc;
997out_unregister_sctp_proto:
998 proto_unregister(&sctpv6_prot);
999 goto out;
1000}
1001
1002/* IPv6 specific exit support. */
1003void sctp_v6_exit(void)
1004{
1005 list_del(&sctp_ipv6_specific.list);
1006 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1007 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1008 inet6_unregister_protosw(&sctpv6_stream_protosw);
1009 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1010 proto_unregister(&sctpv6_prot);
1011}
Linux 6.x block layer and io_uring tree(s)