1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* SCTP kernel implementation |
3 | * (C) Copyright IBM Corp. 2002, 2004 |
4 | * Copyright (c) 2001 Nokia, Inc. |
5 | * Copyright (c) 2001 La Monte H.P. Yarroll |
6 | * Copyright (c) 2002-2003 Intel Corp. |
7 | * |
8 | * This file is part of the SCTP kernel implementation |
9 | * |
10 | * SCTP over IPv6. |
11 | * |
12 | * Please send any bug reports or fixes you make to the |
13 | * email address(es): |
14 | * lksctp developers <linux-sctp@vger.kernel.org> |
15 | * |
16 | * Written or modified by: |
17 | * Le Yanqun <yanqun.le@nokia.com> |
18 | * Hui Huang <hui.huang@nokia.com> |
19 | * La Monte H.P. Yarroll <piggy@acm.org> |
20 | * Sridhar Samudrala <sri@us.ibm.com> |
21 | * Jon Grimm <jgrimm@us.ibm.com> |
22 | * Ardelle Fan <ardelle.fan@intel.com> |
23 | * |
24 | * Based on: |
25 | * linux/net/ipv6/tcp_ipv6.c |
26 | */ |
27 | |
28 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
29 | |
30 | #include <linux/module.h> |
31 | #include <linux/errno.h> |
32 | #include <linux/types.h> |
33 | #include <linux/socket.h> |
34 | #include <linux/sockios.h> |
35 | #include <linux/net.h> |
36 | #include <linux/in.h> |
37 | #include <linux/in6.h> |
38 | #include <linux/netdevice.h> |
39 | #include <linux/init.h> |
40 | #include <linux/ipsec.h> |
41 | #include <linux/slab.h> |
42 | |
43 | #include <linux/ipv6.h> |
44 | #include <linux/icmpv6.h> |
45 | #include <linux/random.h> |
46 | #include <linux/seq_file.h> |
47 | |
48 | #include <net/protocol.h> |
49 | #include <net/ndisc.h> |
50 | #include <net/ip.h> |
51 | #include <net/ipv6.h> |
52 | #include <net/transp_v6.h> |
53 | #include <net/addrconf.h> |
54 | #include <net/ip6_route.h> |
55 | #include <net/inet_common.h> |
56 | #include <net/inet_ecn.h> |
57 | #include <net/sctp/sctp.h> |
58 | #include <net/udp_tunnel.h> |
59 | |
60 | #include <linux/uaccess.h> |
61 | |
62 | static inline int sctp_v6_addr_match_len(union sctp_addr *s1, |
63 | union sctp_addr *s2); |
64 | static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, |
65 | __be16 port); |
66 | static int sctp_v6_cmp_addr(const union sctp_addr *addr1, |
67 | const union sctp_addr *addr2); |
68 | |
69 | /* Event handler for inet6 address addition/deletion events. |
70 | * The sctp_local_addr_list needs to be protocted by a spin lock since |
71 | * multiple notifiers (say IPv4 and IPv6) may be running at the same |
72 | * time and thus corrupt the list. |
73 | * The reader side is protected with RCU. |
74 | */ |
75 | static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, |
76 | void *ptr) |
77 | { |
78 | struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; |
79 | struct sctp_sockaddr_entry *addr = NULL; |
80 | struct sctp_sockaddr_entry *temp; |
81 | struct net *net = dev_net(dev: ifa->idev->dev); |
82 | int found = 0; |
83 | |
84 | switch (ev) { |
85 | case NETDEV_UP: |
86 | addr = kzalloc(size: sizeof(*addr), GFP_ATOMIC); |
87 | if (addr) { |
88 | addr->a.v6.sin6_family = AF_INET6; |
89 | addr->a.v6.sin6_addr = ifa->addr; |
90 | addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; |
91 | addr->valid = 1; |
92 | spin_lock_bh(lock: &net->sctp.local_addr_lock); |
93 | list_add_tail_rcu(new: &addr->list, head: &net->sctp.local_addr_list); |
94 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); |
95 | spin_unlock_bh(lock: &net->sctp.local_addr_lock); |
96 | } |
97 | break; |
98 | case NETDEV_DOWN: |
99 | spin_lock_bh(lock: &net->sctp.local_addr_lock); |
100 | list_for_each_entry_safe(addr, temp, |
101 | &net->sctp.local_addr_list, list) { |
102 | if (addr->a.sa.sa_family == AF_INET6 && |
103 | ipv6_addr_equal(a1: &addr->a.v6.sin6_addr, |
104 | a2: &ifa->addr) && |
105 | addr->a.v6.sin6_scope_id == ifa->idev->dev->ifindex) { |
106 | sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); |
107 | found = 1; |
108 | addr->valid = 0; |
109 | list_del_rcu(entry: &addr->list); |
110 | break; |
111 | } |
112 | } |
113 | spin_unlock_bh(lock: &net->sctp.local_addr_lock); |
114 | if (found) |
115 | kfree_rcu(addr, rcu); |
116 | break; |
117 | } |
118 | |
119 | return NOTIFY_DONE; |
120 | } |
121 | |
122 | static struct notifier_block sctp_inet6addr_notifier = { |
123 | .notifier_call = sctp_inet6addr_event, |
124 | }; |
125 | |
126 | static void sctp_v6_err_handle(struct sctp_transport *t, struct sk_buff *skb, |
127 | __u8 type, __u8 code, __u32 info) |
128 | { |
129 | struct sctp_association *asoc = t->asoc; |
130 | struct sock *sk = asoc->base.sk; |
131 | int err = 0; |
132 | |
133 | switch (type) { |
134 | case ICMPV6_PKT_TOOBIG: |
135 | if (ip6_sk_accept_pmtu(sk)) |
136 | sctp_icmp_frag_needed(sk, asoc, t, pmtu: info); |
137 | return; |
138 | case ICMPV6_PARAMPROB: |
139 | if (ICMPV6_UNK_NEXTHDR == code) { |
140 | sctp_icmp_proto_unreachable(sk, asoc, t); |
141 | return; |
142 | } |
143 | break; |
144 | case NDISC_REDIRECT: |
145 | sctp_icmp_redirect(sk, t, skb); |
146 | return; |
147 | default: |
148 | break; |
149 | } |
150 | |
151 | icmpv6_err_convert(type, code, err: &err); |
152 | if (!sock_owned_by_user(sk) && inet6_test_bit(RECVERR6, sk)) { |
153 | sk->sk_err = err; |
154 | sk_error_report(sk); |
155 | } else { |
156 | WRITE_ONCE(sk->sk_err_soft, err); |
157 | } |
158 | } |
159 | |
160 | /* ICMP error handler. */ |
161 | static int sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
162 | u8 type, u8 code, int offset, __be32 info) |
163 | { |
164 | struct net *net = dev_net(dev: skb->dev); |
165 | struct sctp_transport *transport; |
166 | struct sctp_association *asoc; |
167 | __u16 saveip, savesctp; |
168 | struct sock *sk; |
169 | |
170 | /* Fix up skb to look at the embedded net header. */ |
171 | saveip = skb->network_header; |
172 | savesctp = skb->transport_header; |
173 | skb_reset_network_header(skb); |
174 | skb_set_transport_header(skb, offset); |
175 | sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); |
176 | /* Put back, the original pointers. */ |
177 | skb->network_header = saveip; |
178 | skb->transport_header = savesctp; |
179 | if (!sk) { |
180 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
181 | return -ENOENT; |
182 | } |
183 | |
184 | sctp_v6_err_handle(t: transport, skb, type, code, ntohl(info)); |
185 | sctp_err_finish(sk, transport); |
186 | |
187 | return 0; |
188 | } |
189 | |
190 | int sctp_udp_v6_err(struct sock *sk, struct sk_buff *skb) |
191 | { |
192 | struct net *net = dev_net(dev: skb->dev); |
193 | struct sctp_association *asoc; |
194 | struct sctp_transport *t; |
195 | struct icmp6hdr *hdr; |
196 | __u32 info = 0; |
197 | |
198 | skb->transport_header += sizeof(struct udphdr); |
199 | sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &t); |
200 | if (!sk) { |
201 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS); |
202 | return -ENOENT; |
203 | } |
204 | |
205 | skb->transport_header -= sizeof(struct udphdr); |
206 | hdr = (struct icmp6hdr *)(skb_network_header(skb) - sizeof(struct icmp6hdr)); |
207 | if (hdr->icmp6_type == NDISC_REDIRECT) { |
208 | /* can't be handled without outer ip6hdr known, leave it to udpv6_err */ |
209 | sctp_err_finish(sk, t); |
210 | return 0; |
211 | } |
212 | if (hdr->icmp6_type == ICMPV6_PKT_TOOBIG) |
213 | info = ntohl(hdr->icmp6_mtu); |
214 | sctp_v6_err_handle(t, skb, type: hdr->icmp6_type, code: hdr->icmp6_code, info); |
215 | |
216 | sctp_err_finish(sk, t); |
217 | return 1; |
218 | } |
219 | |
220 | static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t) |
221 | { |
222 | struct dst_entry *dst = dst_clone(dst: t->dst); |
223 | struct flowi6 *fl6 = &t->fl.u.ip6; |
224 | struct sock *sk = skb->sk; |
225 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
226 | __u8 tclass = np->tclass; |
227 | __be32 label; |
228 | |
229 | pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n" , __func__, skb, |
230 | skb->len, &fl6->saddr, &fl6->daddr); |
231 | |
232 | if (t->dscp & SCTP_DSCP_SET_MASK) |
233 | tclass = t->dscp & SCTP_DSCP_VAL_MASK; |
234 | |
235 | if (INET_ECN_is_capable(dsfield: tclass)) |
236 | IP6_ECN_flow_xmit(sk, fl6->flowlabel); |
237 | |
238 | if (!(t->param_flags & SPP_PMTUD_ENABLE)) |
239 | skb->ignore_df = 1; |
240 | |
241 | SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS); |
242 | |
243 | if (!t->encap_port || !sctp_sk(sk)->udp_port) { |
244 | int res; |
245 | |
246 | skb_dst_set(skb, dst); |
247 | rcu_read_lock(); |
248 | res = ip6_xmit(sk, skb, fl6, mark: sk->sk_mark, |
249 | rcu_dereference(np->opt), |
250 | tclass, READ_ONCE(sk->sk_priority)); |
251 | rcu_read_unlock(); |
252 | return res; |
253 | } |
254 | |
255 | if (skb_is_gso(skb)) |
256 | skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM; |
257 | |
258 | skb->encapsulation = 1; |
259 | skb_reset_inner_mac_header(skb); |
260 | skb_reset_inner_transport_header(skb); |
261 | skb_set_inner_ipproto(skb, IPPROTO_SCTP); |
262 | label = ip6_make_flowlabel(net: sock_net(sk), skb, flowlabel: fl6->flowlabel, autolabel: true, fl6); |
263 | |
264 | return udp_tunnel6_xmit_skb(dst, sk, skb, NULL, saddr: &fl6->saddr, |
265 | daddr: &fl6->daddr, prio: tclass, ttl: ip6_dst_hoplimit(dst), |
266 | label, src_port: sctp_sk(sk)->udp_port, dst_port: t->encap_port, nocheck: false); |
267 | } |
268 | |
269 | /* Returns the dst cache entry for the given source and destination ip |
270 | * addresses. |
271 | */ |
272 | static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr, |
273 | struct flowi *fl, struct sock *sk) |
274 | { |
275 | struct sctp_association *asoc = t->asoc; |
276 | struct dst_entry *dst = NULL; |
277 | struct flowi _fl; |
278 | struct flowi6 *fl6 = &_fl.u.ip6; |
279 | struct sctp_bind_addr *bp; |
280 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
281 | struct sctp_sockaddr_entry *laddr; |
282 | union sctp_addr *daddr = &t->ipaddr; |
283 | union sctp_addr dst_saddr; |
284 | struct in6_addr *final_p, final; |
285 | enum sctp_scope scope; |
286 | __u8 matchlen = 0; |
287 | |
288 | memset(&_fl, 0, sizeof(_fl)); |
289 | fl6->daddr = daddr->v6.sin6_addr; |
290 | fl6->fl6_dport = daddr->v6.sin6_port; |
291 | fl6->flowi6_proto = IPPROTO_SCTP; |
292 | if (ipv6_addr_type(addr: &daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
293 | fl6->flowi6_oif = daddr->v6.sin6_scope_id; |
294 | else if (asoc) |
295 | fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if; |
296 | if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK) |
297 | fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK); |
298 | |
299 | if (inet6_test_bit(SNDFLOW, sk) && |
300 | (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) { |
301 | struct ip6_flowlabel *flowlabel; |
302 | |
303 | flowlabel = fl6_sock_lookup(sk, label: fl6->flowlabel); |
304 | if (IS_ERR(ptr: flowlabel)) |
305 | goto out; |
306 | fl6_sock_release(fl: flowlabel); |
307 | } |
308 | |
309 | pr_debug("%s: dst=%pI6 " , __func__, &fl6->daddr); |
310 | |
311 | if (asoc) |
312 | fl6->fl6_sport = htons(asoc->base.bind_addr.port); |
313 | |
314 | if (saddr) { |
315 | fl6->saddr = saddr->v6.sin6_addr; |
316 | if (!fl6->fl6_sport) |
317 | fl6->fl6_sport = saddr->v6.sin6_port; |
318 | |
319 | pr_debug("src=%pI6 - " , &fl6->saddr); |
320 | } |
321 | |
322 | rcu_read_lock(); |
323 | final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), orig: &final); |
324 | rcu_read_unlock(); |
325 | |
326 | dst = ip6_dst_lookup_flow(net: sock_net(sk), sk, fl6, final_dst: final_p); |
327 | if (!asoc || saddr) { |
328 | t->dst = dst; |
329 | memcpy(fl, &_fl, sizeof(_fl)); |
330 | goto out; |
331 | } |
332 | |
333 | bp = &asoc->base.bind_addr; |
334 | scope = sctp_scope(addr: daddr); |
335 | /* ip6_dst_lookup has filled in the fl6->saddr for us. Check |
336 | * to see if we can use it. |
337 | */ |
338 | if (!IS_ERR(ptr: dst)) { |
339 | /* Walk through the bind address list and look for a bind |
340 | * address that matches the source address of the returned dst. |
341 | */ |
342 | sctp_v6_to_addr(addr: &dst_saddr, saddr: &fl6->saddr, htons(bp->port)); |
343 | rcu_read_lock(); |
344 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
345 | if (!laddr->valid || laddr->state == SCTP_ADDR_DEL || |
346 | (laddr->state != SCTP_ADDR_SRC && |
347 | !asoc->src_out_of_asoc_ok)) |
348 | continue; |
349 | |
350 | /* Do not compare against v4 addrs */ |
351 | if ((laddr->a.sa.sa_family == AF_INET6) && |
352 | (sctp_v6_cmp_addr(addr1: &dst_saddr, addr2: &laddr->a))) { |
353 | rcu_read_unlock(); |
354 | t->dst = dst; |
355 | memcpy(fl, &_fl, sizeof(_fl)); |
356 | goto out; |
357 | } |
358 | } |
359 | rcu_read_unlock(); |
360 | /* None of the bound addresses match the source address of the |
361 | * dst. So release it. |
362 | */ |
363 | dst_release(dst); |
364 | dst = NULL; |
365 | } |
366 | |
367 | /* Walk through the bind address list and try to get the |
368 | * best source address for a given destination. |
369 | */ |
370 | rcu_read_lock(); |
371 | list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
372 | struct dst_entry *bdst; |
373 | __u8 bmatchlen; |
374 | |
375 | if (!laddr->valid || |
376 | laddr->state != SCTP_ADDR_SRC || |
377 | laddr->a.sa.sa_family != AF_INET6 || |
378 | scope > sctp_scope(addr: &laddr->a)) |
379 | continue; |
380 | |
381 | fl6->saddr = laddr->a.v6.sin6_addr; |
382 | fl6->fl6_sport = laddr->a.v6.sin6_port; |
383 | final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), orig: &final); |
384 | bdst = ip6_dst_lookup_flow(net: sock_net(sk), sk, fl6, final_dst: final_p); |
385 | |
386 | if (IS_ERR(ptr: bdst)) |
387 | continue; |
388 | |
389 | if (ipv6_chk_addr(net: dev_net(dev: bdst->dev), |
390 | addr: &laddr->a.v6.sin6_addr, dev: bdst->dev, strict: 1)) { |
391 | if (!IS_ERR_OR_NULL(ptr: dst)) |
392 | dst_release(dst); |
393 | dst = bdst; |
394 | t->dst = dst; |
395 | memcpy(fl, &_fl, sizeof(_fl)); |
396 | break; |
397 | } |
398 | |
399 | bmatchlen = sctp_v6_addr_match_len(s1: daddr, s2: &laddr->a); |
400 | if (matchlen > bmatchlen) { |
401 | dst_release(dst: bdst); |
402 | continue; |
403 | } |
404 | |
405 | if (!IS_ERR_OR_NULL(ptr: dst)) |
406 | dst_release(dst); |
407 | dst = bdst; |
408 | matchlen = bmatchlen; |
409 | t->dst = dst; |
410 | memcpy(fl, &_fl, sizeof(_fl)); |
411 | } |
412 | rcu_read_unlock(); |
413 | |
414 | out: |
415 | if (!IS_ERR_OR_NULL(ptr: dst)) { |
416 | struct rt6_info *rt; |
417 | |
418 | rt = (struct rt6_info *)dst; |
419 | t->dst_cookie = rt6_get_cookie(rt); |
420 | pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n" , |
421 | &rt->rt6i_dst.addr, rt->rt6i_dst.plen, |
422 | &fl->u.ip6.saddr); |
423 | } else { |
424 | t->dst = NULL; |
425 | pr_debug("no route\n" ); |
426 | } |
427 | } |
428 | |
429 | /* Returns the number of consecutive initial bits that match in the 2 ipv6 |
430 | * addresses. |
431 | */ |
432 | static inline int sctp_v6_addr_match_len(union sctp_addr *s1, |
433 | union sctp_addr *s2) |
434 | { |
435 | return ipv6_addr_diff(a1: &s1->v6.sin6_addr, a2: &s2->v6.sin6_addr); |
436 | } |
437 | |
438 | /* Fills in the source address(saddr) based on the destination address(daddr) |
439 | * and asoc's bind address list. |
440 | */ |
441 | static void sctp_v6_get_saddr(struct sctp_sock *sk, |
442 | struct sctp_transport *t, |
443 | struct flowi *fl) |
444 | { |
445 | struct flowi6 *fl6 = &fl->u.ip6; |
446 | union sctp_addr *saddr = &t->saddr; |
447 | |
448 | pr_debug("%s: asoc:%p dst:%p\n" , __func__, t->asoc, t->dst); |
449 | |
450 | if (t->dst) { |
451 | saddr->v6.sin6_family = AF_INET6; |
452 | saddr->v6.sin6_addr = fl6->saddr; |
453 | } |
454 | } |
455 | |
456 | /* Make a copy of all potential local addresses. */ |
457 | static void sctp_v6_copy_addrlist(struct list_head *addrlist, |
458 | struct net_device *dev) |
459 | { |
460 | struct inet6_dev *in6_dev; |
461 | struct inet6_ifaddr *ifp; |
462 | struct sctp_sockaddr_entry *addr; |
463 | |
464 | rcu_read_lock(); |
465 | if ((in6_dev = __in6_dev_get(dev)) == NULL) { |
466 | rcu_read_unlock(); |
467 | return; |
468 | } |
469 | |
470 | read_lock_bh(&in6_dev->lock); |
471 | list_for_each_entry(ifp, &in6_dev->addr_list, if_list) { |
472 | /* Add the address to the local list. */ |
473 | addr = kzalloc(size: sizeof(*addr), GFP_ATOMIC); |
474 | if (addr) { |
475 | addr->a.v6.sin6_family = AF_INET6; |
476 | addr->a.v6.sin6_addr = ifp->addr; |
477 | addr->a.v6.sin6_scope_id = dev->ifindex; |
478 | addr->valid = 1; |
479 | INIT_LIST_HEAD(list: &addr->list); |
480 | list_add_tail(new: &addr->list, head: addrlist); |
481 | } |
482 | } |
483 | |
484 | read_unlock_bh(&in6_dev->lock); |
485 | rcu_read_unlock(); |
486 | } |
487 | |
488 | /* Copy over any ip options */ |
489 | static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk) |
490 | { |
491 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk: sk); |
492 | struct ipv6_txoptions *opt; |
493 | |
494 | newnp = inet6_sk(sk: newsk); |
495 | |
496 | rcu_read_lock(); |
497 | opt = rcu_dereference(np->opt); |
498 | if (opt) { |
499 | opt = ipv6_dup_options(sk: newsk, opt); |
500 | if (!opt) |
501 | pr_err("%s: Failed to copy ip options\n" , __func__); |
502 | } |
503 | RCU_INIT_POINTER(newnp->opt, opt); |
504 | rcu_read_unlock(); |
505 | } |
506 | |
507 | /* Account for the IP options */ |
508 | static int sctp_v6_ip_options_len(struct sock *sk) |
509 | { |
510 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
511 | struct ipv6_txoptions *opt; |
512 | int len = 0; |
513 | |
514 | rcu_read_lock(); |
515 | opt = rcu_dereference(np->opt); |
516 | if (opt) |
517 | len = opt->opt_flen + opt->opt_nflen; |
518 | |
519 | rcu_read_unlock(); |
520 | return len; |
521 | } |
522 | |
523 | /* Initialize a sockaddr_storage from in incoming skb. */ |
524 | static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb, |
525 | int is_saddr) |
526 | { |
527 | /* Always called on head skb, so this is safe */ |
528 | struct sctphdr *sh = sctp_hdr(skb); |
529 | struct sockaddr_in6 *sa = &addr->v6; |
530 | |
531 | addr->v6.sin6_family = AF_INET6; |
532 | addr->v6.sin6_flowinfo = 0; /* FIXME */ |
533 | addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; |
534 | |
535 | if (is_saddr) { |
536 | sa->sin6_port = sh->source; |
537 | sa->sin6_addr = ipv6_hdr(skb)->saddr; |
538 | } else { |
539 | sa->sin6_port = sh->dest; |
540 | sa->sin6_addr = ipv6_hdr(skb)->daddr; |
541 | } |
542 | } |
543 | |
544 | /* Initialize an sctp_addr from a socket. */ |
545 | static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) |
546 | { |
547 | addr->v6.sin6_family = AF_INET6; |
548 | addr->v6.sin6_port = 0; |
549 | addr->v6.sin6_addr = sk->sk_v6_rcv_saddr; |
550 | } |
551 | |
552 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ |
553 | static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) |
554 | { |
555 | if (addr->sa.sa_family == AF_INET) { |
556 | sk->sk_v6_rcv_saddr.s6_addr32[0] = 0; |
557 | sk->sk_v6_rcv_saddr.s6_addr32[1] = 0; |
558 | sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); |
559 | sk->sk_v6_rcv_saddr.s6_addr32[3] = |
560 | addr->v4.sin_addr.s_addr; |
561 | } else { |
562 | sk->sk_v6_rcv_saddr = addr->v6.sin6_addr; |
563 | } |
564 | } |
565 | |
566 | /* Initialize sk->sk_daddr from sctp_addr. */ |
567 | static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) |
568 | { |
569 | if (addr->sa.sa_family == AF_INET) { |
570 | sk->sk_v6_daddr.s6_addr32[0] = 0; |
571 | sk->sk_v6_daddr.s6_addr32[1] = 0; |
572 | sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff); |
573 | sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; |
574 | } else { |
575 | sk->sk_v6_daddr = addr->v6.sin6_addr; |
576 | } |
577 | } |
578 | |
579 | /* Initialize a sctp_addr from an address parameter. */ |
580 | static bool sctp_v6_from_addr_param(union sctp_addr *addr, |
581 | union sctp_addr_param *param, |
582 | __be16 port, int iif) |
583 | { |
584 | if (ntohs(param->v6.param_hdr.length) < sizeof(struct sctp_ipv6addr_param)) |
585 | return false; |
586 | |
587 | addr->v6.sin6_family = AF_INET6; |
588 | addr->v6.sin6_port = port; |
589 | addr->v6.sin6_flowinfo = 0; /* BUG */ |
590 | addr->v6.sin6_addr = param->v6.addr; |
591 | addr->v6.sin6_scope_id = iif; |
592 | |
593 | return true; |
594 | } |
595 | |
596 | /* Initialize an address parameter from a sctp_addr and return the length |
597 | * of the address parameter. |
598 | */ |
599 | static int sctp_v6_to_addr_param(const union sctp_addr *addr, |
600 | union sctp_addr_param *param) |
601 | { |
602 | int length = sizeof(struct sctp_ipv6addr_param); |
603 | |
604 | param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; |
605 | param->v6.param_hdr.length = htons(length); |
606 | param->v6.addr = addr->v6.sin6_addr; |
607 | |
608 | return length; |
609 | } |
610 | |
611 | /* Initialize a sctp_addr from struct in6_addr. */ |
612 | static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, |
613 | __be16 port) |
614 | { |
615 | addr->sa.sa_family = AF_INET6; |
616 | addr->v6.sin6_port = port; |
617 | addr->v6.sin6_flowinfo = 0; |
618 | addr->v6.sin6_addr = *saddr; |
619 | addr->v6.sin6_scope_id = 0; |
620 | } |
621 | |
622 | static int __sctp_v6_cmp_addr(const union sctp_addr *addr1, |
623 | const union sctp_addr *addr2) |
624 | { |
625 | if (addr1->sa.sa_family != addr2->sa.sa_family) { |
626 | if (addr1->sa.sa_family == AF_INET && |
627 | addr2->sa.sa_family == AF_INET6 && |
628 | ipv6_addr_v4mapped(a: &addr2->v6.sin6_addr) && |
629 | addr2->v6.sin6_addr.s6_addr32[3] == |
630 | addr1->v4.sin_addr.s_addr) |
631 | return 1; |
632 | |
633 | if (addr2->sa.sa_family == AF_INET && |
634 | addr1->sa.sa_family == AF_INET6 && |
635 | ipv6_addr_v4mapped(a: &addr1->v6.sin6_addr) && |
636 | addr1->v6.sin6_addr.s6_addr32[3] == |
637 | addr2->v4.sin_addr.s_addr) |
638 | return 1; |
639 | |
640 | return 0; |
641 | } |
642 | |
643 | if (!ipv6_addr_equal(a1: &addr1->v6.sin6_addr, a2: &addr2->v6.sin6_addr)) |
644 | return 0; |
645 | |
646 | /* If this is a linklocal address, compare the scope_id. */ |
647 | if ((ipv6_addr_type(addr: &addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) && |
648 | addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && |
649 | addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id) |
650 | return 0; |
651 | |
652 | return 1; |
653 | } |
654 | |
655 | /* Compare addresses exactly. |
656 | * v4-mapped-v6 is also in consideration. |
657 | */ |
658 | static int sctp_v6_cmp_addr(const union sctp_addr *addr1, |
659 | const union sctp_addr *addr2) |
660 | { |
661 | return __sctp_v6_cmp_addr(addr1, addr2) && |
662 | addr1->v6.sin6_port == addr2->v6.sin6_port; |
663 | } |
664 | |
665 | /* Initialize addr struct to INADDR_ANY. */ |
666 | static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) |
667 | { |
668 | memset(addr, 0x00, sizeof(union sctp_addr)); |
669 | addr->v6.sin6_family = AF_INET6; |
670 | addr->v6.sin6_port = port; |
671 | } |
672 | |
673 | /* Is this a wildcard address? */ |
674 | static int sctp_v6_is_any(const union sctp_addr *addr) |
675 | { |
676 | return ipv6_addr_any(a: &addr->v6.sin6_addr); |
677 | } |
678 | |
679 | /* Should this be available for binding? */ |
680 | static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) |
681 | { |
682 | const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr; |
683 | struct sock *sk = &sp->inet.sk; |
684 | struct net *net = sock_net(sk); |
685 | struct net_device *dev = NULL; |
686 | int type; |
687 | |
688 | type = ipv6_addr_type(addr: in6); |
689 | if (IPV6_ADDR_ANY == type) |
690 | return 1; |
691 | if (type == IPV6_ADDR_MAPPED) { |
692 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) |
693 | return 0; |
694 | sctp_v6_map_v4(addr); |
695 | return sctp_get_af_specific(AF_INET)->available(addr, sp); |
696 | } |
697 | if (!(type & IPV6_ADDR_UNICAST)) |
698 | return 0; |
699 | |
700 | if (sk->sk_bound_dev_if) { |
701 | dev = dev_get_by_index_rcu(net, ifindex: sk->sk_bound_dev_if); |
702 | if (!dev) |
703 | return 0; |
704 | } |
705 | |
706 | return ipv6_can_nonlocal_bind(net, inet: &sp->inet) || |
707 | ipv6_chk_addr(net, addr: in6, dev, strict: 0); |
708 | } |
709 | |
710 | /* This function checks if the address is a valid address to be used for |
711 | * SCTP. |
712 | * |
713 | * Output: |
714 | * Return 0 - If the address is a non-unicast or an illegal address. |
715 | * Return 1 - If the address is a unicast. |
716 | */ |
717 | static int sctp_v6_addr_valid(union sctp_addr *addr, |
718 | struct sctp_sock *sp, |
719 | const struct sk_buff *skb) |
720 | { |
721 | int ret = ipv6_addr_type(addr: &addr->v6.sin6_addr); |
722 | |
723 | /* Support v4-mapped-v6 address. */ |
724 | if (ret == IPV6_ADDR_MAPPED) { |
725 | /* Note: This routine is used in input, so v4-mapped-v6 |
726 | * are disallowed here when there is no sctp_sock. |
727 | */ |
728 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) |
729 | return 0; |
730 | sctp_v6_map_v4(addr); |
731 | return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); |
732 | } |
733 | |
734 | /* Is this a non-unicast address */ |
735 | if (!(ret & IPV6_ADDR_UNICAST)) |
736 | return 0; |
737 | |
738 | return 1; |
739 | } |
740 | |
741 | /* What is the scope of 'addr'? */ |
742 | static enum sctp_scope sctp_v6_scope(union sctp_addr *addr) |
743 | { |
744 | enum sctp_scope retval; |
745 | int v6scope; |
746 | |
747 | /* The IPv6 scope is really a set of bit fields. |
748 | * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. |
749 | */ |
750 | |
751 | v6scope = ipv6_addr_scope(addr: &addr->v6.sin6_addr); |
752 | switch (v6scope) { |
753 | case IFA_HOST: |
754 | retval = SCTP_SCOPE_LOOPBACK; |
755 | break; |
756 | case IFA_LINK: |
757 | retval = SCTP_SCOPE_LINK; |
758 | break; |
759 | case IFA_SITE: |
760 | retval = SCTP_SCOPE_PRIVATE; |
761 | break; |
762 | default: |
763 | retval = SCTP_SCOPE_GLOBAL; |
764 | break; |
765 | } |
766 | |
767 | return retval; |
768 | } |
769 | |
770 | /* Create and initialize a new sk for the socket to be returned by accept(). */ |
771 | static struct sock *sctp_v6_create_accept_sk(struct sock *sk, |
772 | struct sctp_association *asoc, |
773 | bool kern) |
774 | { |
775 | struct sock *newsk; |
776 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk: sk); |
777 | struct sctp6_sock *newsctp6sk; |
778 | |
779 | newsk = sk_alloc(net: sock_net(sk), PF_INET6, GFP_KERNEL, prot: sk->sk_prot, kern); |
780 | if (!newsk) |
781 | goto out; |
782 | |
783 | sock_init_data(NULL, sk: newsk); |
784 | |
785 | sctp_copy_sock(newsk, sk, asoc); |
786 | sock_reset_flag(sk, flag: SOCK_ZAPPED); |
787 | |
788 | newsctp6sk = (struct sctp6_sock *)newsk; |
789 | inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; |
790 | |
791 | sctp_sk(sk: newsk)->v4mapped = sctp_sk(sk)->v4mapped; |
792 | |
793 | newnp = inet6_sk(sk: newsk); |
794 | |
795 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
796 | newnp->ipv6_mc_list = NULL; |
797 | newnp->ipv6_ac_list = NULL; |
798 | newnp->ipv6_fl_list = NULL; |
799 | |
800 | sctp_v6_copy_ip_options(sk, newsk); |
801 | |
802 | /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() |
803 | * and getpeername(). |
804 | */ |
805 | sctp_v6_to_sk_daddr(addr: &asoc->peer.primary_addr, sk: newsk); |
806 | |
807 | newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr; |
808 | |
809 | if (newsk->sk_prot->init(newsk)) { |
810 | sk_common_release(sk: newsk); |
811 | newsk = NULL; |
812 | } |
813 | |
814 | out: |
815 | return newsk; |
816 | } |
817 | |
818 | /* Format a sockaddr for return to user space. This makes sure the return is |
819 | * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option. |
820 | */ |
821 | static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) |
822 | { |
823 | if (sp->v4mapped) { |
824 | if (addr->sa.sa_family == AF_INET) |
825 | sctp_v4_map_v6(addr); |
826 | } else { |
827 | if (addr->sa.sa_family == AF_INET6 && |
828 | ipv6_addr_v4mapped(a: &addr->v6.sin6_addr)) |
829 | sctp_v6_map_v4(addr); |
830 | } |
831 | |
832 | if (addr->sa.sa_family == AF_INET) { |
833 | memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero)); |
834 | return sizeof(struct sockaddr_in); |
835 | } |
836 | return sizeof(struct sockaddr_in6); |
837 | } |
838 | |
839 | /* Where did this skb come from? */ |
840 | static int sctp_v6_skb_iif(const struct sk_buff *skb) |
841 | { |
842 | return inet6_iif(skb); |
843 | } |
844 | |
845 | static int sctp_v6_skb_sdif(const struct sk_buff *skb) |
846 | { |
847 | return inet6_sdif(skb); |
848 | } |
849 | |
850 | /* Was this packet marked by Explicit Congestion Notification? */ |
851 | static int sctp_v6_is_ce(const struct sk_buff *skb) |
852 | { |
853 | return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20); |
854 | } |
855 | |
856 | /* Dump the v6 addr to the seq file. */ |
857 | static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) |
858 | { |
859 | seq_printf(m: seq, fmt: "%pI6 " , &addr->v6.sin6_addr); |
860 | } |
861 | |
862 | static void sctp_v6_ecn_capable(struct sock *sk) |
863 | { |
864 | inet6_sk(sk: sk)->tclass |= INET_ECN_ECT_0; |
865 | } |
866 | |
867 | /* Initialize a PF_INET msgname from a ulpevent. */ |
868 | static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, |
869 | char *msgname, int *addrlen) |
870 | { |
871 | union sctp_addr *addr; |
872 | struct sctp_association *asoc; |
873 | union sctp_addr *paddr; |
874 | |
875 | if (!msgname) |
876 | return; |
877 | |
878 | addr = (union sctp_addr *)msgname; |
879 | asoc = event->asoc; |
880 | paddr = &asoc->peer.primary_addr; |
881 | |
882 | if (paddr->sa.sa_family == AF_INET) { |
883 | addr->v4.sin_family = AF_INET; |
884 | addr->v4.sin_port = htons(asoc->peer.port); |
885 | addr->v4.sin_addr = paddr->v4.sin_addr; |
886 | } else { |
887 | addr->v6.sin6_family = AF_INET6; |
888 | addr->v6.sin6_flowinfo = 0; |
889 | if (ipv6_addr_type(addr: &paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
890 | addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id; |
891 | else |
892 | addr->v6.sin6_scope_id = 0; |
893 | addr->v6.sin6_port = htons(asoc->peer.port); |
894 | addr->v6.sin6_addr = paddr->v6.sin6_addr; |
895 | } |
896 | |
897 | *addrlen = sctp_v6_addr_to_user(sp: sctp_sk(sk: asoc->base.sk), addr); |
898 | } |
899 | |
900 | /* Initialize a msg_name from an inbound skb. */ |
901 | static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, |
902 | int *addr_len) |
903 | { |
904 | union sctp_addr *addr; |
905 | struct sctphdr *sh; |
906 | |
907 | if (!msgname) |
908 | return; |
909 | |
910 | addr = (union sctp_addr *)msgname; |
911 | sh = sctp_hdr(skb); |
912 | |
913 | if (ip_hdr(skb)->version == 4) { |
914 | addr->v4.sin_family = AF_INET; |
915 | addr->v4.sin_port = sh->source; |
916 | addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr; |
917 | } else { |
918 | addr->v6.sin6_family = AF_INET6; |
919 | addr->v6.sin6_flowinfo = 0; |
920 | addr->v6.sin6_port = sh->source; |
921 | addr->v6.sin6_addr = ipv6_hdr(skb)->saddr; |
922 | if (ipv6_addr_type(addr: &addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
923 | addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb); |
924 | else |
925 | addr->v6.sin6_scope_id = 0; |
926 | } |
927 | |
928 | *addr_len = sctp_v6_addr_to_user(sp: sctp_sk(sk: skb->sk), addr); |
929 | } |
930 | |
931 | /* Do we support this AF? */ |
932 | static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) |
933 | { |
934 | switch (family) { |
935 | case AF_INET6: |
936 | return 1; |
937 | /* v4-mapped-v6 addresses */ |
938 | case AF_INET: |
939 | if (!ipv6_only_sock(sctp_opt2sk(sp))) |
940 | return 1; |
941 | fallthrough; |
942 | default: |
943 | return 0; |
944 | } |
945 | } |
946 | |
947 | /* Address matching with wildcards allowed. This extra level |
948 | * of indirection lets us choose whether a PF_INET6 should |
949 | * disallow any v4 addresses if we so choose. |
950 | */ |
951 | static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, |
952 | const union sctp_addr *addr2, |
953 | struct sctp_sock *opt) |
954 | { |
955 | struct sock *sk = sctp_opt2sk(sp: opt); |
956 | struct sctp_af *af1, *af2; |
957 | |
958 | af1 = sctp_get_af_specific(addr1->sa.sa_family); |
959 | af2 = sctp_get_af_specific(addr2->sa.sa_family); |
960 | |
961 | if (!af1 || !af2) |
962 | return 0; |
963 | |
964 | /* If the socket is IPv6 only, v4 addrs will not match */ |
965 | if (ipv6_only_sock(sk) && af1 != af2) |
966 | return 0; |
967 | |
968 | /* Today, wildcard AF_INET/AF_INET6. */ |
969 | if (sctp_is_any(sk, addr: addr1) || sctp_is_any(sk, addr: addr2)) |
970 | return 1; |
971 | |
972 | if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET) |
973 | return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr; |
974 | |
975 | return __sctp_v6_cmp_addr(addr1, addr2); |
976 | } |
977 | |
978 | /* Verify that the provided sockaddr looks bindable. Common verification, |
979 | * has already been taken care of. |
980 | */ |
981 | static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) |
982 | { |
983 | struct sctp_af *af; |
984 | |
985 | /* ASSERT: address family has already been verified. */ |
986 | if (addr->sa.sa_family != AF_INET6) |
987 | af = sctp_get_af_specific(addr->sa.sa_family); |
988 | else { |
989 | int type = ipv6_addr_type(addr: &addr->v6.sin6_addr); |
990 | struct net_device *dev; |
991 | |
992 | if (type & IPV6_ADDR_LINKLOCAL) { |
993 | struct net *net; |
994 | if (!addr->v6.sin6_scope_id) |
995 | return 0; |
996 | net = sock_net(sk: &opt->inet.sk); |
997 | rcu_read_lock(); |
998 | dev = dev_get_by_index_rcu(net, ifindex: addr->v6.sin6_scope_id); |
999 | if (!dev || !(ipv6_can_nonlocal_bind(net, inet: &opt->inet) || |
1000 | ipv6_chk_addr(net, addr: &addr->v6.sin6_addr, |
1001 | dev, strict: 0))) { |
1002 | rcu_read_unlock(); |
1003 | return 0; |
1004 | } |
1005 | rcu_read_unlock(); |
1006 | } |
1007 | |
1008 | af = opt->pf->af; |
1009 | } |
1010 | return af->available(addr, opt); |
1011 | } |
1012 | |
1013 | /* Verify that the provided sockaddr looks sendable. Common verification, |
1014 | * has already been taken care of. |
1015 | */ |
1016 | static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) |
1017 | { |
1018 | struct sctp_af *af = NULL; |
1019 | |
1020 | /* ASSERT: address family has already been verified. */ |
1021 | if (addr->sa.sa_family != AF_INET6) |
1022 | af = sctp_get_af_specific(addr->sa.sa_family); |
1023 | else { |
1024 | int type = ipv6_addr_type(addr: &addr->v6.sin6_addr); |
1025 | struct net_device *dev; |
1026 | |
1027 | if (type & IPV6_ADDR_LINKLOCAL) { |
1028 | if (!addr->v6.sin6_scope_id) |
1029 | return 0; |
1030 | rcu_read_lock(); |
1031 | dev = dev_get_by_index_rcu(net: sock_net(sk: &opt->inet.sk), |
1032 | ifindex: addr->v6.sin6_scope_id); |
1033 | rcu_read_unlock(); |
1034 | if (!dev) |
1035 | return 0; |
1036 | } |
1037 | af = opt->pf->af; |
1038 | } |
1039 | |
1040 | return af != NULL; |
1041 | } |
1042 | |
1043 | /* Fill in Supported Address Type information for INIT and INIT-ACK |
1044 | * chunks. Note: In the future, we may want to look at sock options |
1045 | * to determine whether a PF_INET6 socket really wants to have IPV4 |
1046 | * addresses. |
1047 | * Returns number of addresses supported. |
1048 | */ |
1049 | static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, |
1050 | __be16 *types) |
1051 | { |
1052 | types[0] = SCTP_PARAM_IPV6_ADDRESS; |
1053 | if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { |
1054 | types[1] = SCTP_PARAM_IPV4_ADDRESS; |
1055 | return 2; |
1056 | } |
1057 | return 1; |
1058 | } |
1059 | |
1060 | /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */ |
1061 | static int sctp_getname(struct socket *sock, struct sockaddr *uaddr, |
1062 | int peer) |
1063 | { |
1064 | int rc; |
1065 | |
1066 | rc = inet6_getname(sock, uaddr, peer); |
1067 | |
1068 | if (rc < 0) |
1069 | return rc; |
1070 | |
1071 | rc = sctp_v6_addr_to_user(sp: sctp_sk(sk: sock->sk), |
1072 | addr: (union sctp_addr *)uaddr); |
1073 | |
1074 | return rc; |
1075 | } |
1076 | |
1077 | static const struct proto_ops inet6_seqpacket_ops = { |
1078 | .family = PF_INET6, |
1079 | .owner = THIS_MODULE, |
1080 | .release = inet6_release, |
1081 | .bind = inet6_bind, |
1082 | .connect = sctp_inet_connect, |
1083 | .socketpair = sock_no_socketpair, |
1084 | .accept = inet_accept, |
1085 | .getname = sctp_getname, |
1086 | .poll = sctp_poll, |
1087 | .ioctl = inet6_ioctl, |
1088 | .gettstamp = sock_gettstamp, |
1089 | .listen = sctp_inet_listen, |
1090 | .shutdown = inet_shutdown, |
1091 | .setsockopt = sock_common_setsockopt, |
1092 | .getsockopt = sock_common_getsockopt, |
1093 | .sendmsg = inet_sendmsg, |
1094 | .recvmsg = inet_recvmsg, |
1095 | .mmap = sock_no_mmap, |
1096 | #ifdef CONFIG_COMPAT |
1097 | .compat_ioctl = inet6_compat_ioctl, |
1098 | #endif |
1099 | }; |
1100 | |
1101 | static struct inet_protosw sctpv6_seqpacket_protosw = { |
1102 | .type = SOCK_SEQPACKET, |
1103 | .protocol = IPPROTO_SCTP, |
1104 | .prot = &sctpv6_prot, |
1105 | .ops = &inet6_seqpacket_ops, |
1106 | .flags = SCTP_PROTOSW_FLAG |
1107 | }; |
1108 | static struct inet_protosw sctpv6_stream_protosw = { |
1109 | .type = SOCK_STREAM, |
1110 | .protocol = IPPROTO_SCTP, |
1111 | .prot = &sctpv6_prot, |
1112 | .ops = &inet6_seqpacket_ops, |
1113 | .flags = SCTP_PROTOSW_FLAG, |
1114 | }; |
1115 | |
1116 | static int sctp6_rcv(struct sk_buff *skb) |
1117 | { |
1118 | SCTP_INPUT_CB(skb)->encap_port = 0; |
1119 | return sctp_rcv(skb) ? -1 : 0; |
1120 | } |
1121 | |
1122 | static const struct inet6_protocol sctpv6_protocol = { |
1123 | .handler = sctp6_rcv, |
1124 | .err_handler = sctp_v6_err, |
1125 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, |
1126 | }; |
1127 | |
1128 | static struct sctp_af sctp_af_inet6 = { |
1129 | .sa_family = AF_INET6, |
1130 | .sctp_xmit = sctp_v6_xmit, |
1131 | .setsockopt = ipv6_setsockopt, |
1132 | .getsockopt = ipv6_getsockopt, |
1133 | .get_dst = sctp_v6_get_dst, |
1134 | .get_saddr = sctp_v6_get_saddr, |
1135 | .copy_addrlist = sctp_v6_copy_addrlist, |
1136 | .from_skb = sctp_v6_from_skb, |
1137 | .from_sk = sctp_v6_from_sk, |
1138 | .from_addr_param = sctp_v6_from_addr_param, |
1139 | .to_addr_param = sctp_v6_to_addr_param, |
1140 | .cmp_addr = sctp_v6_cmp_addr, |
1141 | .scope = sctp_v6_scope, |
1142 | .addr_valid = sctp_v6_addr_valid, |
1143 | .inaddr_any = sctp_v6_inaddr_any, |
1144 | .is_any = sctp_v6_is_any, |
1145 | .available = sctp_v6_available, |
1146 | .skb_iif = sctp_v6_skb_iif, |
1147 | .skb_sdif = sctp_v6_skb_sdif, |
1148 | .is_ce = sctp_v6_is_ce, |
1149 | .seq_dump_addr = sctp_v6_seq_dump_addr, |
1150 | .ecn_capable = sctp_v6_ecn_capable, |
1151 | .net_header_len = sizeof(struct ipv6hdr), |
1152 | .sockaddr_len = sizeof(struct sockaddr_in6), |
1153 | .ip_options_len = sctp_v6_ip_options_len, |
1154 | }; |
1155 | |
1156 | static struct sctp_pf sctp_pf_inet6 = { |
1157 | .event_msgname = sctp_inet6_event_msgname, |
1158 | .skb_msgname = sctp_inet6_skb_msgname, |
1159 | .af_supported = sctp_inet6_af_supported, |
1160 | .cmp_addr = sctp_inet6_cmp_addr, |
1161 | .bind_verify = sctp_inet6_bind_verify, |
1162 | .send_verify = sctp_inet6_send_verify, |
1163 | .supported_addrs = sctp_inet6_supported_addrs, |
1164 | .create_accept_sk = sctp_v6_create_accept_sk, |
1165 | .addr_to_user = sctp_v6_addr_to_user, |
1166 | .to_sk_saddr = sctp_v6_to_sk_saddr, |
1167 | .to_sk_daddr = sctp_v6_to_sk_daddr, |
1168 | .copy_ip_options = sctp_v6_copy_ip_options, |
1169 | .af = &sctp_af_inet6, |
1170 | }; |
1171 | |
1172 | /* Initialize IPv6 support and register with socket layer. */ |
1173 | void sctp_v6_pf_init(void) |
1174 | { |
1175 | /* Register the SCTP specific PF_INET6 functions. */ |
1176 | sctp_register_pf(&sctp_pf_inet6, PF_INET6); |
1177 | |
1178 | /* Register the SCTP specific AF_INET6 functions. */ |
1179 | sctp_register_af(&sctp_af_inet6); |
1180 | } |
1181 | |
1182 | void sctp_v6_pf_exit(void) |
1183 | { |
1184 | list_del(entry: &sctp_af_inet6.list); |
1185 | } |
1186 | |
1187 | /* Initialize IPv6 support and register with socket layer. */ |
1188 | int sctp_v6_protosw_init(void) |
1189 | { |
1190 | int rc; |
1191 | |
1192 | rc = proto_register(prot: &sctpv6_prot, alloc_slab: 1); |
1193 | if (rc) |
1194 | return rc; |
1195 | |
1196 | /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ |
1197 | inet6_register_protosw(p: &sctpv6_seqpacket_protosw); |
1198 | inet6_register_protosw(p: &sctpv6_stream_protosw); |
1199 | |
1200 | return 0; |
1201 | } |
1202 | |
1203 | void sctp_v6_protosw_exit(void) |
1204 | { |
1205 | inet6_unregister_protosw(p: &sctpv6_seqpacket_protosw); |
1206 | inet6_unregister_protosw(p: &sctpv6_stream_protosw); |
1207 | proto_unregister(prot: &sctpv6_prot); |
1208 | } |
1209 | |
1210 | |
1211 | /* Register with inet6 layer. */ |
1212 | int sctp_v6_add_protocol(void) |
1213 | { |
1214 | /* Register notifier for inet6 address additions/deletions. */ |
1215 | register_inet6addr_notifier(nb: &sctp_inet6addr_notifier); |
1216 | |
1217 | if (inet6_add_protocol(prot: &sctpv6_protocol, IPPROTO_SCTP) < 0) |
1218 | return -EAGAIN; |
1219 | |
1220 | return 0; |
1221 | } |
1222 | |
1223 | /* Unregister with inet6 layer. */ |
1224 | void sctp_v6_del_protocol(void) |
1225 | { |
1226 | inet6_del_protocol(prot: &sctpv6_protocol, IPPROTO_SCTP); |
1227 | unregister_inet6addr_notifier(nb: &sctp_inet6addr_notifier); |
1228 | } |
1229 | |