[TCP]: Move the tcp sock states to net/tcp_states.h
[linux-2.6.git] / net / sctp / ipv6.c
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/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>
78
79 #include <asm/uaccess.h>
80
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 };
85
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;
99
100         idev = in6_dev_get(skb->dev);
101
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         }
115
116         /* Warning:  The sock lock is held.  Remember to call
117          * sctp_err_finish!
118          */
119
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         }
133
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         }
142
143 out_unlock:
144         sctp_err_finish(sk, asoc);
145 out:
146         if (likely(idev != NULL))
147                 in6_dev_put(idev);
148 }
149
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;
157
158         memset(&fl, 0, sizeof(fl));
159
160         fl.proto = sk->sk_protocol;
161
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);
167
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;
176
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         }
181
182         SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
183                           "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
184                           "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
185                           __FUNCTION__, skb, skb->len,
186                           NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
187
188         SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
189
190         return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
191 }
192
193 /* Returns the dst cache entry for the given source and destination ip
194  * addresses.
195  */
196 static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
197                                          union sctp_addr *daddr,
198                                          union sctp_addr *saddr)
199 {
200         struct dst_entry *dst;
201         struct flowi fl;
202
203         memset(&fl, 0, sizeof(fl));
204         ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
205         if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
206                 fl.oif = daddr->v6.sin6_scope_id;
207         
208
209         SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
210                           __FUNCTION__, NIP6(fl.fl6_dst));
211
212         if (saddr) {
213                 ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
214                 SCTP_DEBUG_PRINTK(
215                         "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ",
216                         NIP6(fl.fl6_src));
217         }
218
219         dst = ip6_route_output(NULL, &fl);
220         if (dst) {
221                 struct rt6_info *rt;
222                 rt = (struct rt6_info *)dst;
223                 SCTP_DEBUG_PRINTK(
224                         "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
225                         "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
226                         NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
227         } else {
228                 SCTP_DEBUG_PRINTK("NO ROUTE\n");
229         }
230
231         return dst;
232 }
233
234 /* Returns the number of consecutive initial bits that match in the 2 ipv6
235  * addresses.
236  */
237 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
238                                          union sctp_addr *s2)
239 {
240         struct in6_addr *a1 = &s1->v6.sin6_addr;
241         struct in6_addr *a2 = &s2->v6.sin6_addr;
242         int i, j;
243
244         for (i = 0; i < 4 ; i++) {
245                 __u32 a1xora2;
246
247                 a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
248
249                 if ((j = fls(ntohl(a1xora2))))
250                         return (i * 32 + 32 - j);
251         }
252
253         return (i*32);
254 }
255
256 /* Fills in the source address(saddr) based on the destination address(daddr)
257  * and asoc's bind address list.
258  */
259 static void sctp_v6_get_saddr(struct sctp_association *asoc,
260                               struct dst_entry *dst,
261                               union sctp_addr *daddr,
262                               union sctp_addr *saddr)
263 {
264         struct sctp_bind_addr *bp;
265         rwlock_t *addr_lock;
266         struct sctp_sockaddr_entry *laddr;
267         struct list_head *pos;
268         sctp_scope_t scope;
269         union sctp_addr *baddr = NULL;
270         __u8 matchlen = 0;
271         __u8 bmatchlen;
272
273         SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
274                           "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
275                           __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
276
277         if (!asoc) {
278                 ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
279                 SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: "
280                                   "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
281                                   NIP6(saddr->v6.sin6_addr));
282                 return;
283         }
284
285         scope = sctp_scope(daddr);
286
287         bp = &asoc->base.bind_addr;
288         addr_lock = &asoc->base.addr_lock;
289
290         /* Go through the bind address list and find the best source address
291          * that matches the scope of the destination address.
292          */
293         sctp_read_lock(addr_lock);
294         list_for_each(pos, &bp->address_list) {
295                 laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
296                 if ((laddr->a.sa.sa_family == AF_INET6) &&
297                     (scope <= sctp_scope(&laddr->a))) {
298                         bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
299                         if (!baddr || (matchlen < bmatchlen)) {
300                                 baddr = &laddr->a;
301                                 matchlen = bmatchlen;
302                         }
303                 }
304         }
305
306         if (baddr) {
307                 memcpy(saddr, baddr, sizeof(union sctp_addr));
308                 SCTP_DEBUG_PRINTK("saddr: "
309                                   "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
310                                   NIP6(saddr->v6.sin6_addr));
311         } else {
312                 printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
313                        "address for the "
314                        "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
315                        __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
316         }
317
318         sctp_read_unlock(addr_lock);
319 }
320
321 /* Make a copy of all potential local addresses. */
322 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
323                                   struct net_device *dev)
324 {
325         struct inet6_dev *in6_dev;
326         struct inet6_ifaddr *ifp;
327         struct sctp_sockaddr_entry *addr;
328
329         read_lock(&addrconf_lock);
330         if ((in6_dev = __in6_dev_get(dev)) == NULL) {
331                 read_unlock(&addrconf_lock);
332                 return;
333         }
334
335         read_lock(&in6_dev->lock);
336         for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
337                 /* Add the address to the local list.  */
338                 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
339                 if (addr) {
340                         addr->a.v6.sin6_family = AF_INET6;
341                         addr->a.v6.sin6_port = 0;
342                         addr->a.v6.sin6_addr = ifp->addr;
343                         addr->a.v6.sin6_scope_id = dev->ifindex;
344                         INIT_LIST_HEAD(&addr->list);
345                         list_add_tail(&addr->list, addrlist);
346                 }
347         }
348
349         read_unlock(&in6_dev->lock);
350         read_unlock(&addrconf_lock);
351 }
352
353 /* Initialize a sockaddr_storage from in incoming skb. */
354 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
355                              int is_saddr)
356 {
357         void *from;
358         __u16 *port;
359         struct sctphdr *sh;
360
361         port = &addr->v6.sin6_port;
362         addr->v6.sin6_family = AF_INET6;
363         addr->v6.sin6_flowinfo = 0; /* FIXME */
364         addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
365
366         sh = (struct sctphdr *) skb->h.raw;
367         if (is_saddr) {
368                 *port  = ntohs(sh->source);
369                 from = &skb->nh.ipv6h->saddr;
370         } else {
371                 *port = ntohs(sh->dest);
372                 from = &skb->nh.ipv6h->daddr;
373         }
374         ipv6_addr_copy(&addr->v6.sin6_addr, from);
375 }
376
377 /* Initialize an sctp_addr from a socket. */
378 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
379 {
380         addr->v6.sin6_family = AF_INET6;
381         addr->v6.sin6_port = inet_sk(sk)->num;
382         addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
383 }
384
385 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
386 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
387 {
388         if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
389                 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
390                 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
391                 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
392                 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
393                         addr->v4.sin_addr.s_addr;
394         } else {
395                 inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
396         }
397 }
398
399 /* Initialize sk->sk_daddr from sctp_addr. */
400 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
401 {
402         if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
403                 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
404                 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
405                 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
406                 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
407         } else {
408                 inet6_sk(sk)->daddr = addr->v6.sin6_addr;
409         }
410 }
411
412 /* Initialize a sctp_addr from an address parameter. */
413 static void sctp_v6_from_addr_param(union sctp_addr *addr,
414                                     union sctp_addr_param *param,
415                                     __u16 port, int iif)
416 {
417         addr->v6.sin6_family = AF_INET6;
418         addr->v6.sin6_port = port;
419         addr->v6.sin6_flowinfo = 0; /* BUG */
420         ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
421         addr->v6.sin6_scope_id = iif;
422 }
423
424 /* Initialize an address parameter from a sctp_addr and return the length
425  * of the address parameter.
426  */
427 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
428                                  union sctp_addr_param *param)
429 {
430         int length = sizeof(sctp_ipv6addr_param_t);
431
432         param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
433         param->v6.param_hdr.length = ntohs(length);
434         ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
435
436         return length;
437 }
438
439 /* Initialize a sctp_addr from a dst_entry. */
440 static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
441                               unsigned short port)
442 {
443         struct rt6_info *rt = (struct rt6_info *)dst;
444         addr->sa.sa_family = AF_INET6;
445         addr->v6.sin6_port = port;
446         ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
447 }
448
449 /* Compare addresses exactly.
450  * v4-mapped-v6 is also in consideration.
451  */
452 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
453                             const union sctp_addr *addr2)
454 {
455         if (addr1->sa.sa_family != addr2->sa.sa_family) {
456                 if (addr1->sa.sa_family == AF_INET &&
457                     addr2->sa.sa_family == AF_INET6 &&
458                     IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) {
459                         if (addr2->v6.sin6_port == addr1->v4.sin_port &&
460                             addr2->v6.sin6_addr.s6_addr32[3] ==
461                             addr1->v4.sin_addr.s_addr)
462                                 return 1;
463                 }
464                 if (addr2->sa.sa_family == AF_INET &&
465                     addr1->sa.sa_family == AF_INET6 &&
466                     IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) {
467                         if (addr1->v6.sin6_port == addr2->v4.sin_port &&
468                             addr1->v6.sin6_addr.s6_addr32[3] ==
469                             addr2->v4.sin_addr.s_addr)
470                                 return 1;
471                 }
472                 return 0;
473         }
474         if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
475                 return 0;
476         /* If this is a linklocal address, compare the scope_id. */
477         if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
478                 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
479                     (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
480                         return 0;
481                 }
482         }
483
484         return 1;
485 }
486
487 /* Initialize addr struct to INADDR_ANY. */
488 static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port)
489 {
490         memset(addr, 0x00, sizeof(union sctp_addr));
491         addr->v6.sin6_family = AF_INET6;
492         addr->v6.sin6_port = port;
493 }
494
495 /* Is this a wildcard address? */
496 static int sctp_v6_is_any(const union sctp_addr *addr)
497 {
498         return ipv6_addr_any(&addr->v6.sin6_addr);
499 }
500
501 /* Should this be available for binding?   */
502 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
503 {
504         int type;
505         struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr;
506
507         type = ipv6_addr_type(in6);
508         if (IPV6_ADDR_ANY == type)
509                 return 1;
510         if (type == IPV6_ADDR_MAPPED) {
511                 if (sp && !sp->v4mapped)
512                         return 0;
513                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
514                         return 0;
515                 sctp_v6_map_v4(addr);
516                 return sctp_get_af_specific(AF_INET)->available(addr, sp);
517         }
518         if (!(type & IPV6_ADDR_UNICAST))
519                 return 0;
520
521         return ipv6_chk_addr(in6, NULL, 0);
522 }
523
524 /* This function checks if the address is a valid address to be used for
525  * SCTP.
526  *
527  * Output:
528  * Return 0 - If the address is a non-unicast or an illegal address.
529  * Return 1 - If the address is a unicast.
530  */
531 static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp)
532 {
533         int ret = ipv6_addr_type(&addr->v6.sin6_addr);
534
535         /* Support v4-mapped-v6 address. */
536         if (ret == IPV6_ADDR_MAPPED) {
537                 /* Note: This routine is used in input, so v4-mapped-v6
538                  * are disallowed here when there is no sctp_sock.
539                  */
540                 if (!sp || !sp->v4mapped)
541                         return 0;
542                 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
543                         return 0;
544                 sctp_v6_map_v4(addr);
545                 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp);
546         }
547
548         /* Is this a non-unicast address */
549         if (!(ret & IPV6_ADDR_UNICAST))
550                 return 0;
551
552         return 1;
553 }
554
555 /* What is the scope of 'addr'?  */
556 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
557 {
558         int v6scope;
559         sctp_scope_t retval;
560
561         /* The IPv6 scope is really a set of bit fields.
562          * See IFA_* in <net/if_inet6.h>.  Map to a generic SCTP scope.
563          */
564
565         v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
566         switch (v6scope) {
567         case IFA_HOST:
568                 retval = SCTP_SCOPE_LOOPBACK;
569                 break;
570         case IFA_LINK:
571                 retval = SCTP_SCOPE_LINK;
572                 break;
573         case IFA_SITE:
574                 retval = SCTP_SCOPE_PRIVATE;
575                 break;
576         default:
577                 retval = SCTP_SCOPE_GLOBAL;
578                 break;
579         };
580
581         return retval;
582 }
583
584 /* Create and initialize a new sk for the socket to be returned by accept(). */
585 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
586                                              struct sctp_association *asoc)
587 {
588         struct inet_sock *inet = inet_sk(sk);
589         struct sock *newsk;
590         struct inet_sock *newinet;
591         struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
592         struct sctp6_sock *newsctp6sk;
593
594         newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
595         if (!newsk)
596                 goto out;
597
598         sock_init_data(NULL, newsk);
599
600         newsk->sk_type = SOCK_STREAM;
601
602         newsk->sk_prot = sk->sk_prot;
603         newsk->sk_no_check = sk->sk_no_check;
604         newsk->sk_reuse = sk->sk_reuse;
605
606         newsk->sk_destruct = inet_sock_destruct;
607         newsk->sk_family = PF_INET6;
608         newsk->sk_protocol = IPPROTO_SCTP;
609         newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
610         newsk->sk_shutdown = sk->sk_shutdown;
611         sock_reset_flag(sk, SOCK_ZAPPED);
612
613         newsctp6sk = (struct sctp6_sock *)newsk;
614         inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
615
616         newinet = inet_sk(newsk);
617         newnp = inet6_sk(newsk);
618
619         memcpy(newnp, np, sizeof(struct ipv6_pinfo));
620
621         /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
622          * and getpeername().
623          */
624         newinet->sport = inet->sport;
625         newnp->saddr = np->saddr;
626         newnp->rcv_saddr = np->rcv_saddr;
627         newinet->dport = htons(asoc->peer.port);
628         sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
629
630         /* Init the ipv4 part of the socket since we can have sockets
631          * using v6 API for ipv4.
632          */
633         newinet->uc_ttl = -1;
634         newinet->mc_loop = 1;
635         newinet->mc_ttl = 1;
636         newinet->mc_index = 0;
637         newinet->mc_list = NULL;
638
639         if (ipv4_config.no_pmtu_disc)
640                 newinet->pmtudisc = IP_PMTUDISC_DONT;
641         else
642                 newinet->pmtudisc = IP_PMTUDISC_WANT;
643
644         sk_refcnt_debug_inc(newsk);
645
646         if (newsk->sk_prot->init(newsk)) {
647                 sk_common_release(newsk);
648                 newsk = NULL;
649         }
650
651 out:
652         return newsk;
653 }
654
655 /* Map v4 address to mapped v6 address */
656 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
657 {
658         if (sp->v4mapped && AF_INET == addr->sa.sa_family)
659                 sctp_v4_map_v6(addr);
660 }
661
662 /* Where did this skb come from?  */
663 static int sctp_v6_skb_iif(const struct sk_buff *skb)
664 {
665         struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
666         return opt->iif;
667 }
668
669 /* Was this packet marked by Explicit Congestion Notification? */
670 static int sctp_v6_is_ce(const struct sk_buff *skb)
671 {
672         return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20);
673 }
674
675 /* Dump the v6 addr to the seq file. */
676 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
677 {
678         seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
679                    NIP6(addr->v6.sin6_addr));
680 }
681
682 /* Initialize a PF_INET6 socket msg_name. */
683 static void sctp_inet6_msgname(char *msgname, int *addr_len)
684 {
685         struct sockaddr_in6 *sin6;
686
687         sin6 = (struct sockaddr_in6 *)msgname;
688         sin6->sin6_family = AF_INET6;
689         sin6->sin6_flowinfo = 0;
690         sin6->sin6_scope_id = 0; /*FIXME */
691         *addr_len = sizeof(struct sockaddr_in6);
692 }
693
694 /* Initialize a PF_INET msgname from a ulpevent. */
695 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
696                                      char *msgname, int *addrlen)
697 {
698         struct sockaddr_in6 *sin6, *sin6from;
699
700         if (msgname) {
701                 union sctp_addr *addr;
702                 struct sctp_association *asoc;
703
704                 asoc = event->asoc;
705                 sctp_inet6_msgname(msgname, addrlen);
706                 sin6 = (struct sockaddr_in6 *)msgname;
707                 sin6->sin6_port = htons(asoc->peer.port);
708                 addr = &asoc->peer.primary_addr;
709
710                 /* Note: If we go to a common v6 format, this code
711                  * will change.
712                  */
713
714                 /* Map ipv4 address into v4-mapped-on-v6 address.  */
715                 if (sctp_sk(asoc->base.sk)->v4mapped &&
716                     AF_INET == addr->sa.sa_family) {
717                         sctp_v4_map_v6((union sctp_addr *)sin6);
718                         sin6->sin6_addr.s6_addr32[3] =
719                                 addr->v4.sin_addr.s_addr;
720                         return;
721                 }
722
723                 sin6from = &asoc->peer.primary_addr.v6;
724                 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
725                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
726                         sin6->sin6_scope_id = sin6from->sin6_scope_id;
727         }
728 }
729
730 /* Initialize a msg_name from an inbound skb. */
731 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
732                                    int *addr_len)
733 {
734         struct sctphdr *sh;
735         struct sockaddr_in6 *sin6;
736
737         if (msgname) {
738                 sctp_inet6_msgname(msgname, addr_len);
739                 sin6 = (struct sockaddr_in6 *)msgname;
740                 sh = (struct sctphdr *)skb->h.raw;
741                 sin6->sin6_port = sh->source;
742
743                 /* Map ipv4 address into v4-mapped-on-v6 address. */
744                 if (sctp_sk(skb->sk)->v4mapped &&
745                     skb->nh.iph->version == 4) {
746                         sctp_v4_map_v6((union sctp_addr *)sin6);
747                         sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
748                         return;
749                 }
750
751                 /* Otherwise, just copy the v6 address. */
752                 ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
753                 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
754                         struct sctp_ulpevent *ev = sctp_skb2event(skb);
755                         sin6->sin6_scope_id = ev->iif;
756                 }
757         }
758 }
759
760 /* Do we support this AF? */
761 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
762 {
763         switch (family) {
764         case AF_INET6:
765                 return 1;
766         /* v4-mapped-v6 addresses */
767         case AF_INET:
768                 if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped)
769                         return 1;
770         default:
771                 return 0;
772         }
773 }
774
775 /* Address matching with wildcards allowed.  This extra level
776  * of indirection lets us choose whether a PF_INET6 should
777  * disallow any v4 addresses if we so choose.
778  */
779 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
780                                const union sctp_addr *addr2,
781                                struct sctp_sock *opt)
782 {
783         struct sctp_af *af1, *af2;
784
785         af1 = sctp_get_af_specific(addr1->sa.sa_family);
786         af2 = sctp_get_af_specific(addr2->sa.sa_family);
787
788         if (!af1 || !af2)
789                 return 0;
790         /* Today, wildcard AF_INET/AF_INET6. */
791         if (sctp_is_any(addr1) || sctp_is_any(addr2))
792                 return 1;
793
794         if (addr1->sa.sa_family != addr2->sa.sa_family)
795                 return 0;
796
797         return af1->cmp_addr(addr1, addr2);
798 }
799
800 /* Verify that the provided sockaddr looks bindable.   Common verification,
801  * has already been taken care of.
802  */
803 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
804 {
805         struct sctp_af *af;
806
807         /* ASSERT: address family has already been verified. */
808         if (addr->sa.sa_family != AF_INET6)
809                 af = sctp_get_af_specific(addr->sa.sa_family);
810         else {
811                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
812                 struct net_device *dev;
813
814                 if (type & IPV6_ADDR_LINKLOCAL) {
815                         if (!addr->v6.sin6_scope_id)
816                                 return 0;
817                         dev = dev_get_by_index(addr->v6.sin6_scope_id);
818                         if (!dev)
819                                 return 0;
820                         dev_put(dev);
821                 }
822                 af = opt->pf->af;
823         }
824         return af->available(addr, opt);
825 }
826
827 /* Verify that the provided sockaddr looks sendable.   Common verification,
828  * has already been taken care of.
829  */
830 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
831 {
832         struct sctp_af *af = NULL;
833
834         /* ASSERT: address family has already been verified. */
835         if (addr->sa.sa_family != AF_INET6)
836                 af = sctp_get_af_specific(addr->sa.sa_family);
837         else {
838                 int type = ipv6_addr_type(&addr->v6.sin6_addr);
839                 struct net_device *dev;
840
841                 if (type & IPV6_ADDR_LINKLOCAL) {
842                         if (!addr->v6.sin6_scope_id)
843                                 return 0;
844                         dev = dev_get_by_index(addr->v6.sin6_scope_id);
845                         if (!dev)
846                                 return 0;
847                         dev_put(dev);
848                 }
849                 af = opt->pf->af;
850         }
851
852         return af != NULL;
853 }
854
855 /* Fill in Supported Address Type information for INIT and INIT-ACK
856  * chunks.   Note: In the future, we may want to look at sock options
857  * to determine whether a PF_INET6 socket really wants to have IPV4
858  * addresses.
859  * Returns number of addresses supported.
860  */
861 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
862                                       __u16 *types)
863 {
864         types[0] = SCTP_PARAM_IPV4_ADDRESS;
865         types[1] = SCTP_PARAM_IPV6_ADDRESS;
866         return 2;
867 }
868
869 static struct proto_ops inet6_seqpacket_ops = {
870         .family     = PF_INET6,
871         .owner      = THIS_MODULE,
872         .release    = inet6_release,
873         .bind       = inet6_bind,
874         .connect    = inet_dgram_connect,
875         .socketpair = sock_no_socketpair,
876         .accept     = inet_accept,
877         .getname    = inet6_getname,
878         .poll       = sctp_poll,
879         .ioctl      = inet6_ioctl,
880         .listen     = sctp_inet_listen,
881         .shutdown   = inet_shutdown,
882         .setsockopt = sock_common_setsockopt,
883         .getsockopt = sock_common_getsockopt,
884         .sendmsg    = inet_sendmsg,
885         .recvmsg    = sock_common_recvmsg,
886         .mmap       = sock_no_mmap,
887 };
888
889 static struct inet_protosw sctpv6_seqpacket_protosw = {
890         .type          = SOCK_SEQPACKET,
891         .protocol      = IPPROTO_SCTP,
892         .prot          = &sctpv6_prot,
893         .ops           = &inet6_seqpacket_ops,
894         .capability    = -1,
895         .no_check      = 0,
896         .flags         = SCTP_PROTOSW_FLAG
897 };
898 static struct inet_protosw sctpv6_stream_protosw = {
899         .type          = SOCK_STREAM,
900         .protocol      = IPPROTO_SCTP,
901         .prot          = &sctpv6_prot,
902         .ops           = &inet6_seqpacket_ops,
903         .capability    = -1,
904         .no_check      = 0,
905         .flags         = SCTP_PROTOSW_FLAG,
906 };
907
908 static int sctp6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
909 {
910         return sctp_rcv(*pskb) ? -1 : 0;
911 }
912
913 static struct inet6_protocol sctpv6_protocol = {
914         .handler      = sctp6_rcv,
915         .err_handler  = sctp_v6_err,
916         .flags        = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
917 };
918
919 static struct sctp_af sctp_ipv6_specific = {
920         .sctp_xmit       = sctp_v6_xmit,
921         .setsockopt      = ipv6_setsockopt,
922         .getsockopt      = ipv6_getsockopt,
923         .get_dst         = sctp_v6_get_dst,
924         .get_saddr       = sctp_v6_get_saddr,
925         .copy_addrlist   = sctp_v6_copy_addrlist,
926         .from_skb        = sctp_v6_from_skb,
927         .from_sk         = sctp_v6_from_sk,
928         .to_sk_saddr     = sctp_v6_to_sk_saddr,
929         .to_sk_daddr     = sctp_v6_to_sk_daddr,
930         .from_addr_param = sctp_v6_from_addr_param,
931         .to_addr_param   = sctp_v6_to_addr_param,
932         .dst_saddr       = sctp_v6_dst_saddr,
933         .cmp_addr        = sctp_v6_cmp_addr,
934         .scope           = sctp_v6_scope,
935         .addr_valid      = sctp_v6_addr_valid,
936         .inaddr_any      = sctp_v6_inaddr_any,
937         .is_any          = sctp_v6_is_any,
938         .available       = sctp_v6_available,
939         .skb_iif         = sctp_v6_skb_iif,
940         .is_ce           = sctp_v6_is_ce,
941         .seq_dump_addr   = sctp_v6_seq_dump_addr,
942         .net_header_len  = sizeof(struct ipv6hdr),
943         .sockaddr_len    = sizeof(struct sockaddr_in6),
944         .sa_family       = AF_INET6,
945 };
946
947 static struct sctp_pf sctp_pf_inet6_specific = {
948         .event_msgname = sctp_inet6_event_msgname,
949         .skb_msgname   = sctp_inet6_skb_msgname,
950         .af_supported  = sctp_inet6_af_supported,
951         .cmp_addr      = sctp_inet6_cmp_addr,
952         .bind_verify   = sctp_inet6_bind_verify,
953         .send_verify   = sctp_inet6_send_verify,
954         .supported_addrs = sctp_inet6_supported_addrs,
955         .create_accept_sk = sctp_v6_create_accept_sk,
956         .addr_v4map    = sctp_v6_addr_v4map,
957         .af            = &sctp_ipv6_specific,
958 };
959
960 /* Initialize IPv6 support and register with inet6 stack.  */
961 int sctp_v6_init(void)
962 {
963         int rc = proto_register(&sctpv6_prot, 1);
964
965         if (rc)
966                 goto out;
967         /* Register inet6 protocol. */
968         rc = -EAGAIN;
969         if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
970                 goto out_unregister_sctp_proto;
971
972         /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
973         inet6_register_protosw(&sctpv6_seqpacket_protosw);
974         inet6_register_protosw(&sctpv6_stream_protosw);
975
976         /* Register the SCTP specific PF_INET6 functions. */
977         sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
978
979         /* Register the SCTP specific AF_INET6 functions. */
980         sctp_register_af(&sctp_ipv6_specific);
981
982         /* Register notifier for inet6 address additions/deletions. */
983         register_inet6addr_notifier(&sctp_inet6addr_notifier);
984         rc = 0;
985 out:
986         return rc;
987 out_unregister_sctp_proto:
988         proto_unregister(&sctpv6_prot);
989         goto out;
990 }
991
992 /* IPv6 specific exit support. */
993 void sctp_v6_exit(void)
994 {
995         list_del(&sctp_ipv6_specific.list);
996         inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
997         inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
998         inet6_unregister_protosw(&sctpv6_stream_protosw);
999         unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
1000         proto_unregister(&sctpv6_prot);
1001 }