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[DCCP]: Fix Oops in DCCPv6
[linux-2.6-block.git] / net / dccp / ipv6.c
CommitLineData
3df80d93
ACM		 1/*
2 * DCCP over IPv6
45329e71 3 * Linux INET6 implementation
3df80d93
ACM		 4 *
5 * Based on net/dccp6/ipv6.c
6 *
7 * Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version
12 * 2 of the License, or (at your option) any later version.
13 */
14
3df80d93
ACM		 15#include <linux/module.h>
16#include <linux/random.h>
17#include <linux/xfrm.h>
18
19#include <net/addrconf.h>
20#include <net/inet_common.h>
21#include <net/inet_hashtables.h>
14c85021 22#include <net/inet_sock.h>
3df80d93
ACM		 23#include <net/inet6_connection_sock.h>
24#include <net/inet6_hashtables.h>
25#include <net/ip6_route.h>
26#include <net/ipv6.h>
27#include <net/protocol.h>
28#include <net/transp_v6.h>
aa0e4e4a 29#include <net/ip6_checksum.h>
3df80d93
ACM		 30#include <net/xfrm.h>
31
32#include "dccp.h"
33#include "ipv6.h"
4b79f0af 34#include "feat.h"
3df80d93 35
72478873
ACM		 36/* Socket used for sending RSTs and ACKs */
37static struct socket *dccp_v6_ctl_socket;
38
3df80d93
ACM		 39static void dccp_v6_ctl_send_reset(struct sk_buff *skb);
40static void dccp_v6_reqsk_send_ack(struct sk_buff *skb,
41 struct request_sock *req);
42static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb);
43
44static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb);
45
46static struct inet_connection_sock_af_ops dccp_ipv6_mapped;
47static struct inet_connection_sock_af_ops dccp_ipv6_af_ops;
48
49static int dccp_v6_get_port(struct sock *sk, unsigned short snum)
50{
51 return inet_csk_get_port(&dccp_hashinfo, sk, snum,
52 inet6_csk_bind_conflict);
53}
54
55static void dccp_v6_hash(struct sock *sk)
56{
57 if (sk->sk_state != DCCP_CLOSED) {
58 if (inet_csk(sk)->icsk_af_ops == &dccp_ipv6_mapped) {
c985ed70 59 dccp_hash(sk);
3df80d93
ACM		 60 return;
61 }
62 local_bh_disable();
63 __inet6_hash(&dccp_hashinfo, sk);
64 local_bh_enable();
65 }
66}
67
68static inline u16 dccp_v6_check(struct dccp_hdr *dh, int len,
45329e71
ACM		 69 struct in6_addr *saddr,
70 struct in6_addr *daddr,
3df80d93
ACM		 71 unsigned long base)
72{
73 return csum_ipv6_magic(saddr, daddr, len, IPPROTO_DCCP, base);
74}
75
76static __u32 dccp_v6_init_sequence(struct sock *sk, struct sk_buff *skb)
77{
78 const struct dccp_hdr *dh = dccp_hdr(skb);
79
80 if (skb->protocol == htons(ETH_P_IPV6))
81 return secure_tcpv6_sequence_number(skb->nh.ipv6h->daddr.s6_addr32,
82 skb->nh.ipv6h->saddr.s6_addr32,
83 dh->dccph_dport,
84 dh->dccph_sport);
45329e71
ACM		 85
86 return secure_dccp_sequence_number(skb->nh.iph->daddr,
87 skb->nh.iph->saddr,
88 dh->dccph_dport,
89 dh->dccph_sport);
3df80d93
ACM		 90}
91
45329e71 92static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr,
3df80d93
ACM		 93 int addr_len)
94{
45329e71 95 struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr;
d83d8461 96 struct inet_connection_sock *icsk = inet_csk(sk);
3df80d93
ACM		 97 struct inet_sock *inet = inet_sk(sk);
98 struct ipv6_pinfo *np = inet6_sk(sk);
99 struct dccp_sock *dp = dccp_sk(sk);
100 struct in6_addr *saddr = NULL, *final_p = NULL, final;
101 struct flowi fl;
102 struct dst_entry *dst;
103 int addr_type;
104 int err;
105
106 dp->dccps_role = DCCP_ROLE_CLIENT;
107
45329e71 108 if (addr_len < SIN6_LEN_RFC2133)
3df80d93
ACM		 109 return -EINVAL;
110
45329e71 111 if (usin->sin6_family != AF_INET6)
3df80d93
ACM		 112 return -EAFNOSUPPORT;
113
114 memset(&fl, 0, sizeof(fl));
115
116 if (np->sndflow) {
117 fl.fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK;
118 IP6_ECN_flow_init(fl.fl6_flowlabel);
119 if (fl.fl6_flowlabel & IPV6_FLOWLABEL_MASK) {
120 struct ip6_flowlabel *flowlabel;
121 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
122 if (flowlabel == NULL)
123 return -EINVAL;
124 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
125 fl6_sock_release(flowlabel);
126 }
127 }
3df80d93 128 /*
45329e71
ACM		 129 * connect() to INADDR_ANY means loopback (BSD'ism).
130 */
131 if (ipv6_addr_any(&usin->sin6_addr))
132 usin->sin6_addr.s6_addr[15] = 1;
3df80d93
ACM		 133
134 addr_type = ipv6_addr_type(&usin->sin6_addr);
135
45329e71 136 if (addr_type & IPV6_ADDR_MULTICAST)
3df80d93
ACM		 137 return -ENETUNREACH;
138
139 if (addr_type & IPV6_ADDR_LINKLOCAL) {
140 if (addr_len >= sizeof(struct sockaddr_in6) &&
141 usin->sin6_scope_id) {
142 /* If interface is set while binding, indices
143 * must coincide.
144 */
145 if (sk->sk_bound_dev_if &&
146 sk->sk_bound_dev_if != usin->sin6_scope_id)
147 return -EINVAL;
148
149 sk->sk_bound_dev_if = usin->sin6_scope_id;
150 }
151
152 /* Connect to link-local address requires an interface */
153 if (!sk->sk_bound_dev_if)
154 return -EINVAL;
155 }
156
157 ipv6_addr_copy(&np->daddr, &usin->sin6_addr);
158 np->flow_label = fl.fl6_flowlabel;
159
160 /*
45329e71 161 * DCCP over IPv4
3df80d93 162 */
3df80d93 163 if (addr_type == IPV6_ADDR_MAPPED) {
d83d8461 164 u32 exthdrlen = icsk->icsk_ext_hdr_len;
3df80d93
ACM		 165 struct sockaddr_in sin;
166
167 SOCK_DEBUG(sk, "connect: ipv4 mapped\n");
168
169 if (__ipv6_only_sock(sk))
170 return -ENETUNREACH;
171
172 sin.sin_family = AF_INET;
173 sin.sin_port = usin->sin6_port;
174 sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3];
175
d83d8461 176 icsk->icsk_af_ops = &dccp_ipv6_mapped;
3df80d93
ACM		 177 sk->sk_backlog_rcv = dccp_v4_do_rcv;
178
179 err = dccp_v4_connect(sk, (struct sockaddr *)&sin, sizeof(sin));
3df80d93 180 if (err) {
d83d8461
ACM		 181 icsk->icsk_ext_hdr_len = exthdrlen;
182 icsk->icsk_af_ops = &dccp_ipv6_af_ops;
3df80d93
ACM		 183 sk->sk_backlog_rcv = dccp_v6_do_rcv;
184 goto failure;
185 } else {
186 ipv6_addr_set(&np->saddr, 0, 0, htonl(0x0000FFFF),
187 inet->saddr);
188 ipv6_addr_set(&np->rcv_saddr, 0, 0, htonl(0x0000FFFF),
189 inet->rcv_saddr);
190 }
191
192 return err;
193 }
194
195 if (!ipv6_addr_any(&np->rcv_saddr))
196 saddr = &np->rcv_saddr;
197
198 fl.proto = IPPROTO_DCCP;
199 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
200 ipv6_addr_copy(&fl.fl6_src, saddr ? saddr : &np->saddr);
201 fl.oif = sk->sk_bound_dev_if;
202 fl.fl_ip_dport = usin->sin6_port;
203 fl.fl_ip_sport = inet->sport;
beb8d13b 204 security_sk_classify_flow(sk, &fl);
3df80d93 205
45329e71
ACM		 206 if (np->opt != NULL && np->opt->srcrt != NULL) {
207 const struct rt0_hdr *rt0 = (struct rt0_hdr *)np->opt->srcrt;
208
3df80d93
ACM		 209 ipv6_addr_copy(&final, &fl.fl6_dst);
210 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
211 final_p = &final;
212 }
213
214 err = ip6_dst_lookup(sk, &dst, &fl);
215 if (err)
216 goto failure;
45329e71 217
3df80d93
ACM		 218 if (final_p)
219 ipv6_addr_copy(&fl.fl6_dst, final_p);
220
45329e71
ACM		 221 err = xfrm_lookup(&dst, &fl, sk, 0);
222 if (err < 0)
3df80d93
ACM		 223 goto failure;
224
225 if (saddr == NULL) {
226 saddr = &fl.fl6_src;
227 ipv6_addr_copy(&np->rcv_saddr, saddr);
228 }
229
230 /* set the source address */
231 ipv6_addr_copy(&np->saddr, saddr);
232 inet->rcv_saddr = LOOPBACK4_IPV6;
233
8e1ef0a9 234 __ip6_dst_store(sk, dst, NULL, NULL);
3df80d93 235
d83d8461 236 icsk->icsk_ext_hdr_len = 0;
45329e71 237 if (np->opt != NULL)
d83d8461
ACM		 238 icsk->icsk_ext_hdr_len = (np->opt->opt_flen +
239 np->opt->opt_nflen);
3df80d93
ACM		 240
241 inet->dport = usin->sin6_port;
242
243 dccp_set_state(sk, DCCP_REQUESTING);
d8313f5c 244 err = inet6_hash_connect(&dccp_death_row, sk);
3df80d93
ACM		 245 if (err)
246 goto late_failure;
247 /* FIXME */
248#if 0
249 dp->dccps_gar = secure_dccp_v6_sequence_number(np->saddr.s6_addr32,
250 np->daddr.s6_addr32,
251 inet->sport,
252 inet->dport);
253#endif
254 err = dccp_connect(sk);
255 if (err)
256 goto late_failure;
257
258 return 0;
259
260late_failure:
261 dccp_set_state(sk, DCCP_CLOSED);
262 __sk_dst_reset(sk);
263failure:
264 inet->dport = 0;
265 sk->sk_route_caps = 0;
266 return err;
267}
268
269static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
60fe62e7 270 int type, int code, int offset, __be32 info)
3df80d93
ACM		 271{
272 struct ipv6hdr *hdr = (struct ipv6hdr *)skb->data;
273 const struct dccp_hdr *dh = (struct dccp_hdr *)(skb->data + offset);
274 struct ipv6_pinfo *np;
275 struct sock *sk;
276 int err;
277 __u64 seq;
278
279 sk = inet6_lookup(&dccp_hashinfo, &hdr->daddr, dh->dccph_dport,
280 &hdr->saddr, dh->dccph_sport, skb->dev->ifindex);
281
282 if (sk == NULL) {
283 ICMP6_INC_STATS_BH(__in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
284 return;
285 }
286
287 if (sk->sk_state == DCCP_TIME_WAIT) {
9469c7b4 288 inet_twsk_put(inet_twsk(sk));
3df80d93
ACM		 289 return;
290 }
291
292 bh_lock_sock(sk);
293 if (sock_owned_by_user(sk))
294 NET_INC_STATS_BH(LINUX_MIB_LOCKDROPPEDICMPS);
295
296 if (sk->sk_state == DCCP_CLOSED)
297 goto out;
298
299 np = inet6_sk(sk);
300
301 if (type == ICMPV6_PKT_TOOBIG) {
3df80d93
ACM		 302 struct dst_entry *dst = NULL;
303
304 if (sock_owned_by_user(sk))
305 goto out;
306 if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED))
307 goto out;
308
309 /* icmp should have updated the destination cache entry */
310 dst = __sk_dst_check(sk, np->dst_cookie);
3df80d93
ACM		 311 if (dst == NULL) {
312 struct inet_sock *inet = inet_sk(sk);
313 struct flowi fl;
314
315 /* BUGGG_FUTURE: Again, it is not clear how
316 to handle rthdr case. Ignore this complexity
317 for now.
318 */
319 memset(&fl, 0, sizeof(fl));
320 fl.proto = IPPROTO_DCCP;
321 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
322 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
323 fl.oif = sk->sk_bound_dev_if;
324 fl.fl_ip_dport = inet->dport;
325 fl.fl_ip_sport = inet->sport;
beb8d13b 326 security_sk_classify_flow(sk, &fl);
3df80d93 327
45329e71
ACM		 328 err = ip6_dst_lookup(sk, &dst, &fl);
329 if (err) {
3df80d93
ACM		 330 sk->sk_err_soft = -err;
331 goto out;
332 }
333
45329e71
ACM		 334 err = xfrm_lookup(&dst, &fl, sk, 0);
335 if (err < 0) {
3df80d93
ACM		 336 sk->sk_err_soft = -err;
337 goto out;
338 }
3df80d93
ACM		 339 } else
340 dst_hold(dst);
341
d83d8461 342 if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) {
3df80d93
ACM		 343 dccp_sync_mss(sk, dst_mtu(dst));
344 } /* else let the usual retransmit timer handle it */
345 dst_release(dst);
346 goto out;
347 }
348
349 icmpv6_err_convert(type, code, &err);
350
351 seq = DCCP_SKB_CB(skb)->dccpd_seq;
352 /* Might be for an request_sock */
353 switch (sk->sk_state) {
354 struct request_sock *req, **prev;
355 case DCCP_LISTEN:
356 if (sock_owned_by_user(sk))
357 goto out;
358
359 req = inet6_csk_search_req(sk, &prev, dh->dccph_dport,
360 &hdr->daddr, &hdr->saddr,
361 inet6_iif(skb));
45329e71 362 if (req == NULL)
3df80d93
ACM		 363 goto out;
364
45329e71
ACM		 365 /*
366 * ICMPs are not backlogged, hence we cannot get an established
367 * socket here.
3df80d93
ACM		 368 */
369 BUG_TRAP(req->sk == NULL);
370
371 if (seq != dccp_rsk(req)->dreq_iss) {
372 NET_INC_STATS_BH(LINUX_MIB_OUTOFWINDOWICMPS);
373 goto out;
374 }
375
376 inet_csk_reqsk_queue_drop(sk, req, prev);
377 goto out;
378
379 case DCCP_REQUESTING:
380 case DCCP_RESPOND: /* Cannot happen.
45329e71 381 It can, it SYNs are crossed. --ANK */
3df80d93
ACM		 382 if (!sock_owned_by_user(sk)) {
383 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
384 sk->sk_err = err;
385 /*
386 * Wake people up to see the error
387 * (see connect in sock.c)
388 */
389 sk->sk_error_report(sk);
3df80d93
ACM		 390 dccp_done(sk);
391 } else
392 sk->sk_err_soft = err;
393 goto out;
394 }
395
396 if (!sock_owned_by_user(sk) && np->recverr) {
397 sk->sk_err = err;
398 sk->sk_error_report(sk);
399 } else
400 sk->sk_err_soft = err;
401
402out:
403 bh_unlock_sock(sk);
404 sock_put(sk);
405}
406
407
408static int dccp_v6_send_response(struct sock *sk, struct request_sock *req,
409 struct dst_entry *dst)
410{
411 struct inet6_request_sock *ireq6 = inet6_rsk(req);
412 struct ipv6_pinfo *np = inet6_sk(sk);
413 struct sk_buff *skb;
414 struct ipv6_txoptions *opt = NULL;
415 struct in6_addr *final_p = NULL, final;
416 struct flowi fl;
417 int err = -1;
418
419 memset(&fl, 0, sizeof(fl));
420 fl.proto = IPPROTO_DCCP;
421 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
422 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
423 fl.fl6_flowlabel = 0;
424 fl.oif = ireq6->iif;
425 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
426 fl.fl_ip_sport = inet_sk(sk)->sport;
4237c75c 427 security_req_classify_flow(req, &fl);
3df80d93
ACM		 428
429 if (dst == NULL) {
430 opt = np->opt;
431 if (opt == NULL &&
432 np->rxopt.bits.osrcrt == 2 &&
433 ireq6->pktopts) {
434 struct sk_buff *pktopts = ireq6->pktopts;
435 struct inet6_skb_parm *rxopt = IP6CB(pktopts);
45329e71 436
3df80d93
ACM		 437 if (rxopt->srcrt)
438 opt = ipv6_invert_rthdr(sk,
439 (struct ipv6_rt_hdr *)(pktopts->nh.raw +
440 rxopt->srcrt));
441 }
442
45329e71
ACM		 443 if (opt != NULL && opt->srcrt != NULL) {
444 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
445
3df80d93
ACM		 446 ipv6_addr_copy(&final, &fl.fl6_dst);
447 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
448 final_p = &final;
449 }
450
451 err = ip6_dst_lookup(sk, &dst, &fl);
452 if (err)
453 goto done;
45329e71 454
3df80d93
ACM		 455 if (final_p)
456 ipv6_addr_copy(&fl.fl6_dst, final_p);
45329e71
ACM		 457
458 err = xfrm_lookup(&dst, &fl, sk, 0);
459 if (err < 0)
3df80d93
ACM		 460 goto done;
461 }
462
463 skb = dccp_make_response(sk, dst, req);
464 if (skb != NULL) {
465 struct dccp_hdr *dh = dccp_hdr(skb);
45329e71 466
3df80d93
ACM		 467 dh->dccph_checksum = dccp_v6_check(dh, skb->len,
468 &ireq6->loc_addr,
469 &ireq6->rmt_addr,
470 csum_partial((char *)dh,
471 skb->len,
472 skb->csum));
473 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
474 err = ip6_xmit(sk, skb, &fl, opt, 0);
475 if (err == NET_XMIT_CN)
476 err = 0;
477 }
478
479done:
45329e71 480 if (opt != NULL && opt != np->opt)
3df80d93 481 sock_kfree_s(sk, opt, opt->tot_len);
0cbd7825 482 dst_release(dst);
3df80d93
ACM		 483 return err;
484}
485
486static void dccp_v6_reqsk_destructor(struct request_sock *req)
487{
488 if (inet6_rsk(req)->pktopts != NULL)
489 kfree_skb(inet6_rsk(req)->pktopts);
490}
491
492static struct request_sock_ops dccp6_request_sock_ops = {
493 .family = AF_INET6,
494 .obj_size = sizeof(struct dccp6_request_sock),
495 .rtx_syn_ack = dccp_v6_send_response,
496 .send_ack = dccp_v6_reqsk_send_ack,
497 .destructor = dccp_v6_reqsk_destructor,
498 .send_reset = dccp_v6_ctl_send_reset,
499};
500
6d6ee43e
ACM		 501static struct timewait_sock_ops dccp6_timewait_sock_ops = {
502 .twsk_obj_size = sizeof(struct dccp6_timewait_sock),
503};
504
3df80d93
ACM		 505static void dccp_v6_send_check(struct sock *sk, int len, struct sk_buff *skb)
506{
507 struct ipv6_pinfo *np = inet6_sk(sk);
508 struct dccp_hdr *dh = dccp_hdr(skb);
509
510 dh->dccph_checksum = csum_ipv6_magic(&np->saddr, &np->daddr,
45329e71 511 len, IPPROTO_DCCP,
3df80d93
ACM		 512 csum_partial((char *)dh,
513 dh->dccph_doff << 2,
514 skb->csum));
515}
516
517static void dccp_v6_ctl_send_reset(struct sk_buff *rxskb)
518{
45329e71 519 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
118b2c95 520 const u32 dccp_hdr_reset_len = sizeof(struct dccp_hdr) +
3df80d93
ACM		 521 sizeof(struct dccp_hdr_ext) +
522 sizeof(struct dccp_hdr_reset);
523 struct sk_buff *skb;
524 struct flowi fl;
525 u64 seqno;
526
527 if (rxdh->dccph_type == DCCP_PKT_RESET)
528 return;
529
530 if (!ipv6_unicast_destination(rxskb))
45329e71 531 return;
3df80d93 532
118b2c95
ACM		 533 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
534 GFP_ATOMIC);
45329e71 535 if (skb == NULL)
3df80d93
ACM		 536 return;
537
118b2c95 538 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
3df80d93
ACM		 539
540 skb->h.raw = skb_push(skb, dccp_hdr_reset_len);
541 dh = dccp_hdr(skb);
542 memset(dh, 0, dccp_hdr_reset_len);
543
544 /* Swap the send and the receive. */
545 dh->dccph_type = DCCP_PKT_RESET;
546 dh->dccph_sport = rxdh->dccph_dport;
547 dh->dccph_dport = rxdh->dccph_sport;
548 dh->dccph_doff = dccp_hdr_reset_len / 4;
549 dh->dccph_x = 1;
550 dccp_hdr_reset(skb)->dccph_reset_code =
551 DCCP_SKB_CB(rxskb)->dccpd_reset_code;
552
553 /* See "8.3.1. Abnormal Termination" in draft-ietf-dccp-spec-11 */
554 seqno = 0;
555 if (DCCP_SKB_CB(rxskb)->dccpd_ack_seq != DCCP_PKT_WITHOUT_ACK_SEQ)
556 dccp_set_seqno(&seqno, DCCP_SKB_CB(rxskb)->dccpd_ack_seq + 1);
557
558 dccp_hdr_set_seq(dh, seqno);
559 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
560 DCCP_SKB_CB(rxskb)->dccpd_seq);
561
562 memset(&fl, 0, sizeof(fl));
563 ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
564 ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
565 dh->dccph_checksum = csum_ipv6_magic(&fl.fl6_src, &fl.fl6_dst,
566 sizeof(*dh), IPPROTO_DCCP,
567 skb->csum);
568 fl.proto = IPPROTO_DCCP;
569 fl.oif = inet6_iif(rxskb);
570 fl.fl_ip_dport = dh->dccph_dport;
571 fl.fl_ip_sport = dh->dccph_sport;
beb8d13b 572 security_skb_classify_flow(rxskb, &fl);
3df80d93
ACM		 573
574 /* sk = NULL, but it is safe for now. RST socket required. */
575 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
576 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
72478873 577 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
3df80d93
ACM		 578 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
579 DCCP_INC_STATS_BH(DCCP_MIB_OUTRSTS);
580 return;
581 }
582 }
583
584 kfree_skb(skb);
585}
586
c5fed159
ACM		 587static void dccp_v6_reqsk_send_ack(struct sk_buff *rxskb,
588 struct request_sock *req)
3df80d93
ACM		 589{
590 struct flowi fl;
591 struct dccp_hdr *rxdh = dccp_hdr(rxskb), *dh;
118b2c95 592 const u32 dccp_hdr_ack_len = sizeof(struct dccp_hdr) +
3df80d93
ACM		 593 sizeof(struct dccp_hdr_ext) +
594 sizeof(struct dccp_hdr_ack_bits);
595 struct sk_buff *skb;
596
118b2c95
ACM		 597 skb = alloc_skb(dccp_v6_ctl_socket->sk->sk_prot->max_header,
598 GFP_ATOMIC);
3df80d93
ACM		 599 if (skb == NULL)
600 return;
601
118b2c95 602 skb_reserve(skb, dccp_v6_ctl_socket->sk->sk_prot->max_header);
3df80d93
ACM		 603
604 skb->h.raw = skb_push(skb, dccp_hdr_ack_len);
605 dh = dccp_hdr(skb);
606 memset(dh, 0, dccp_hdr_ack_len);
607
608 /* Build DCCP header and checksum it. */
609 dh->dccph_type = DCCP_PKT_ACK;
610 dh->dccph_sport = rxdh->dccph_dport;
611 dh->dccph_dport = rxdh->dccph_sport;
612 dh->dccph_doff = dccp_hdr_ack_len / 4;
613 dh->dccph_x = 1;
45329e71 614
3df80d93
ACM		 615 dccp_hdr_set_seq(dh, DCCP_SKB_CB(rxskb)->dccpd_ack_seq);
616 dccp_hdr_set_ack(dccp_hdr_ack_bits(skb),
617 DCCP_SKB_CB(rxskb)->dccpd_seq);
618
619 memset(&fl, 0, sizeof(fl));
620 ipv6_addr_copy(&fl.fl6_dst, &rxskb->nh.ipv6h->saddr);
621 ipv6_addr_copy(&fl.fl6_src, &rxskb->nh.ipv6h->daddr);
622
623 /* FIXME: calculate checksum, IPv4 also should... */
624
625 fl.proto = IPPROTO_DCCP;
626 fl.oif = inet6_iif(rxskb);
627 fl.fl_ip_dport = dh->dccph_dport;
628 fl.fl_ip_sport = dh->dccph_sport;
4237c75c 629 security_req_classify_flow(req, &fl);
3df80d93
ACM		 630
631 if (!ip6_dst_lookup(NULL, &skb->dst, &fl)) {
632 if (xfrm_lookup(&skb->dst, &fl, NULL, 0) >= 0) {
72478873 633 ip6_xmit(dccp_v6_ctl_socket->sk, skb, &fl, NULL, 0);
3df80d93
ACM		 634 DCCP_INC_STATS_BH(DCCP_MIB_OUTSEGS);
635 return;
636 }
637 }
638
639 kfree_skb(skb);
640}
641
3df80d93
ACM		 642static struct sock *dccp_v6_hnd_req(struct sock *sk,struct sk_buff *skb)
643{
644 const struct dccp_hdr *dh = dccp_hdr(skb);
645 const struct ipv6hdr *iph = skb->nh.ipv6h;
646 struct sock *nsk;
647 struct request_sock **prev;
648 /* Find possible connection requests. */
649 struct request_sock *req = inet6_csk_search_req(sk, &prev,
650 dh->dccph_sport,
651 &iph->saddr,
652 &iph->daddr,
653 inet6_iif(skb));
654 if (req != NULL)
655 return dccp_check_req(sk, skb, req, prev);
656
657 nsk = __inet6_lookup_established(&dccp_hashinfo,
658 &iph->saddr, dh->dccph_sport,
659 &iph->daddr, ntohs(dh->dccph_dport),
660 inet6_iif(skb));
3df80d93
ACM		 661 if (nsk != NULL) {
662 if (nsk->sk_state != DCCP_TIME_WAIT) {
663 bh_lock_sock(nsk);
664 return nsk;
665 }
9469c7b4 666 inet_twsk_put(inet_twsk(nsk));
3df80d93
ACM		 667 return NULL;
668 }
669
670 return sk;
671}
672
673static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
674{
3df80d93
ACM		 675 struct dccp_sock dp;
676 struct request_sock *req;
677 struct dccp_request_sock *dreq;
678 struct inet6_request_sock *ireq6;
679 struct ipv6_pinfo *np = inet6_sk(sk);
60fe62e7 680 const __be32 service = dccp_hdr_request(skb)->dccph_req_service;
3df80d93
ACM		 681 struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb);
682 __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY;
683
684 if (skb->protocol == htons(ETH_P_IP))
685 return dccp_v4_conn_request(sk, skb);
686
687 if (!ipv6_unicast_destination(skb))
45329e71 688 goto drop;
3df80d93
ACM		 689
690 if (dccp_bad_service_code(sk, service)) {
691 reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE;
692 goto drop;
693 }
694 /*
45329e71 695 * There are no SYN attacks on IPv6, yet...
3df80d93
ACM		 696 */
697 if (inet_csk_reqsk_queue_is_full(sk))
45329e71 698 goto drop;
3df80d93
ACM		 699
700 if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1)
701 goto drop;
702
82709531 703 req = inet6_reqsk_alloc(&dccp6_request_sock_ops);
3df80d93
ACM		 704 if (req == NULL)
705 goto drop;
706
707 /* FIXME: process options */
708
709 dccp_openreq_init(req, &dp, skb);
710
4237c75c
VY		 711 if (security_inet_conn_request(sk, skb, req))
712 goto drop_and_free;
713
3df80d93 714 ireq6 = inet6_rsk(req);
3df80d93
ACM		 715 ipv6_addr_copy(&ireq6->rmt_addr, &skb->nh.ipv6h->saddr);
716 ipv6_addr_copy(&ireq6->loc_addr, &skb->nh.ipv6h->daddr);
4b79f0af 717 req->rcv_wnd = dccp_feat_default_sequence_window;
3df80d93
ACM		 718 ireq6->pktopts = NULL;
719
720 if (ipv6_opt_accepted(sk, skb) ||
721 np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo ||
722 np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) {
723 atomic_inc(&skb->users);
724 ireq6->pktopts = skb;
725 }
726 ireq6->iif = sk->sk_bound_dev_if;
727
728 /* So that link locals have meaning */
729 if (!sk->sk_bound_dev_if &&
730 ipv6_addr_type(&ireq6->rmt_addr) & IPV6_ADDR_LINKLOCAL)
731 ireq6->iif = inet6_iif(skb);
732
45329e71 733 /*
3df80d93
ACM		 734 * Step 3: Process LISTEN state
735 *
736 * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie
737 *
738 * In fact we defer setting S.GSR, S.SWL, S.SWH to
739 * dccp_create_openreq_child.
740 */
741 dreq = dccp_rsk(req);
742 dreq->dreq_isr = dcb->dccpd_seq;
743 dreq->dreq_iss = dccp_v6_init_sequence(sk, skb);
744 dreq->dreq_service = service;
745
746 if (dccp_v6_send_response(sk, req, NULL))
747 goto drop_and_free;
748
749 inet6_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT);
750 return 0;
751
752drop_and_free:
753 reqsk_free(req);
754drop:
755 DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS);
756 dcb->dccpd_reset_code = reset_code;
757 return -1;
758}
759
760static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
761 struct sk_buff *skb,
762 struct request_sock *req,
763 struct dst_entry *dst)
764{
765 struct inet6_request_sock *ireq6 = inet6_rsk(req);
766 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
767 struct inet_sock *newinet;
768 struct dccp_sock *newdp;
769 struct dccp6_sock *newdp6;
770 struct sock *newsk;
771 struct ipv6_txoptions *opt;
772
773 if (skb->protocol == htons(ETH_P_IP)) {
774 /*
775 * v6 mapped
776 */
3df80d93 777 newsk = dccp_v4_request_recv_sock(sk, skb, req, dst);
45329e71 778 if (newsk == NULL)
3df80d93
ACM		 779 return NULL;
780
781 newdp6 = (struct dccp6_sock *)newsk;
782 newdp = dccp_sk(newsk);
783 newinet = inet_sk(newsk);
784 newinet->pinet6 = &newdp6->inet6;
785 newnp = inet6_sk(newsk);
786
787 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
788
789 ipv6_addr_set(&newnp->daddr, 0, 0, htonl(0x0000FFFF),
790 newinet->daddr);
791
792 ipv6_addr_set(&newnp->saddr, 0, 0, htonl(0x0000FFFF),
793 newinet->saddr);
794
795 ipv6_addr_copy(&newnp->rcv_saddr, &newnp->saddr);
796
797 inet_csk(newsk)->icsk_af_ops = &dccp_ipv6_mapped;
798 newsk->sk_backlog_rcv = dccp_v4_do_rcv;
799 newnp->pktoptions = NULL;
800 newnp->opt = NULL;
801 newnp->mcast_oif = inet6_iif(skb);
802 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
803
804 /*
805 * No need to charge this sock to the relevant IPv6 refcnt debug socks count
806 * here, dccp_create_openreq_child now does this for us, see the comment in
807 * that function for the gory details. -acme
808 */
809
810 /* It is tricky place. Until this moment IPv4 tcp
811 worked with IPv6 icsk.icsk_af_ops.
812 Sync it now.
813 */
d83d8461 814 dccp_sync_mss(newsk, inet_csk(newsk)->icsk_pmtu_cookie);
3df80d93
ACM		 815
816 return newsk;
817 }
818
819 opt = np->opt;
820
821 if (sk_acceptq_is_full(sk))
822 goto out_overflow;
823
45329e71
ACM		 824 if (np->rxopt.bits.osrcrt == 2 && opt == NULL && ireq6->pktopts) {
825 const struct inet6_skb_parm *rxopt = IP6CB(ireq6->pktopts);
826
3df80d93
ACM		 827 if (rxopt->srcrt)
828 opt = ipv6_invert_rthdr(sk,
829 (struct ipv6_rt_hdr *)(ireq6->pktopts->nh.raw +
830 rxopt->srcrt));
831 }
832
833 if (dst == NULL) {
834 struct in6_addr *final_p = NULL, final;
835 struct flowi fl;
836
837 memset(&fl, 0, sizeof(fl));
838 fl.proto = IPPROTO_DCCP;
839 ipv6_addr_copy(&fl.fl6_dst, &ireq6->rmt_addr);
45329e71
ACM		 840 if (opt != NULL && opt->srcrt != NULL) {
841 const struct rt0_hdr *rt0 = (struct rt0_hdr *)opt->srcrt;
842
3df80d93
ACM		 843 ipv6_addr_copy(&final, &fl.fl6_dst);
844 ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
845 final_p = &final;
846 }
847 ipv6_addr_copy(&fl.fl6_src, &ireq6->loc_addr);
848 fl.oif = sk->sk_bound_dev_if;
849 fl.fl_ip_dport = inet_rsk(req)->rmt_port;
850 fl.fl_ip_sport = inet_sk(sk)->sport;
beb8d13b 851 security_sk_classify_flow(sk, &fl);
3df80d93
ACM		 852
853 if (ip6_dst_lookup(sk, &dst, &fl))
854 goto out;
855
856 if (final_p)
857 ipv6_addr_copy(&fl.fl6_dst, final_p);
858
859 if ((xfrm_lookup(&dst, &fl, sk, 0)) < 0)
860 goto out;
45329e71 861 }
3df80d93
ACM		 862
863 newsk = dccp_create_openreq_child(sk, req, skb);
864 if (newsk == NULL)
865 goto out;
866
867 /*
868 * No need to charge this sock to the relevant IPv6 refcnt debug socks
869 * count here, dccp_create_openreq_child now does this for us, see the
870 * comment in that function for the gory details. -acme
871 */
872
8e1ef0a9 873 __ip6_dst_store(newsk, dst, NULL, NULL);
45329e71
ACM		 874 newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM |
875 NETIF_F_TSO);
3df80d93
ACM		 876 newdp6 = (struct dccp6_sock *)newsk;
877 newinet = inet_sk(newsk);
878 newinet->pinet6 = &newdp6->inet6;
879 newdp = dccp_sk(newsk);
880 newnp = inet6_sk(newsk);
881
882 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
883
884 ipv6_addr_copy(&newnp->daddr, &ireq6->rmt_addr);
885 ipv6_addr_copy(&newnp->saddr, &ireq6->loc_addr);
886 ipv6_addr_copy(&newnp->rcv_saddr, &ireq6->loc_addr);
887 newsk->sk_bound_dev_if = ireq6->iif;
888
45329e71 889 /* Now IPv6 options...
3df80d93
ACM		 890
891 First: no IPv4 options.
892 */
893 newinet->opt = NULL;
894
895 /* Clone RX bits */
896 newnp->rxopt.all = np->rxopt.all;
897
898 /* Clone pktoptions received with SYN */
899 newnp->pktoptions = NULL;
900 if (ireq6->pktopts != NULL) {
901 newnp->pktoptions = skb_clone(ireq6->pktopts, GFP_ATOMIC);
902 kfree_skb(ireq6->pktopts);
903 ireq6->pktopts = NULL;
904 if (newnp->pktoptions)
905 skb_set_owner_r(newnp->pktoptions, newsk);
906 }
907 newnp->opt = NULL;
908 newnp->mcast_oif = inet6_iif(skb);
909 newnp->mcast_hops = skb->nh.ipv6h->hop_limit;
910
45329e71
ACM		 911 /*
912 * Clone native IPv6 options from listening socket (if any)
913 *
914 * Yes, keeping reference count would be much more clever, but we make
915 * one more one thing there: reattach optmem to newsk.
3df80d93 916 */
45329e71 917 if (opt != NULL) {
3df80d93
ACM		 918 newnp->opt = ipv6_dup_options(newsk, opt);
919 if (opt != np->opt)
920 sock_kfree_s(sk, opt, opt->tot_len);
921 }
922
d83d8461 923 inet_csk(newsk)->icsk_ext_hdr_len = 0;
45329e71 924 if (newnp->opt != NULL)
d83d8461
ACM		 925 inet_csk(newsk)->icsk_ext_hdr_len = (newnp->opt->opt_nflen +
926 newnp->opt->opt_flen);
3df80d93
ACM		 927
928 dccp_sync_mss(newsk, dst_mtu(dst));
929
930 newinet->daddr = newinet->saddr = newinet->rcv_saddr = LOOPBACK4_IPV6;
931
932 __inet6_hash(&dccp_hashinfo, newsk);
933 inet_inherit_port(&dccp_hashinfo, sk, newsk);
934
935 return newsk;
936
937out_overflow:
938 NET_INC_STATS_BH(LINUX_MIB_LISTENOVERFLOWS);
939out:
940 NET_INC_STATS_BH(LINUX_MIB_LISTENDROPS);
45329e71 941 if (opt != NULL && opt != np->opt)
3df80d93
ACM		 942 sock_kfree_s(sk, opt, opt->tot_len);
943 dst_release(dst);
944 return NULL;
945}
946
947/* The socket must have it's spinlock held when we get
948 * here.
949 *
950 * We have a potential double-lock case here, so even when
951 * doing backlog processing we use the BH locking scheme.
952 * This is because we cannot sleep with the original spinlock
953 * held.
954 */
955static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb)
956{
957 struct ipv6_pinfo *np = inet6_sk(sk);
958 struct sk_buff *opt_skb = NULL;
959
960 /* Imagine: socket is IPv6. IPv4 packet arrives,
961 goes to IPv4 receive handler and backlogged.
962 From backlog it always goes here. Kerboom...
963 Fortunately, dccp_rcv_established and rcv_established
964 handle them correctly, but it is not case with
965 dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK
966 */
967
968 if (skb->protocol == htons(ETH_P_IP))
969 return dccp_v4_do_rcv(sk, skb);
970
fda9ef5d 971 if (sk_filter(sk, skb))
3df80d93
ACM		 972 goto discard;
973
974 /*
45329e71
ACM		 975 * socket locking is here for SMP purposes as backlog rcv is currently
976 * called with bh processing disabled.
3df80d93
ACM		 977 */
978
979 /* Do Stevens' IPV6_PKTOPTIONS.
980
981 Yes, guys, it is the only place in our code, where we
982 may make it not affecting IPv4.
983 The rest of code is protocol independent,
984 and I do not like idea to uglify IPv4.
985
986 Actually, all the idea behind IPV6_PKTOPTIONS
987 looks not very well thought. For now we latch
988 options, received in the last packet, enqueued
989 by tcp. Feel free to propose better solution.
990 --ANK (980728)
991 */
992 if (np->rxopt.all)
993 opt_skb = skb_clone(skb, GFP_ATOMIC);
994
995 if (sk->sk_state == DCCP_OPEN) { /* Fast path */
996 if (dccp_rcv_established(sk, skb, dccp_hdr(skb), skb->len))
997 goto reset;
998 return 0;
999 }
1000
45329e71 1001 if (sk->sk_state == DCCP_LISTEN) {
3df80d93 1002 struct sock *nsk = dccp_v6_hnd_req(sk, skb);
3df80d93 1003
45329e71
ACM		 1004 if (nsk == NULL)
1005 goto discard;
3df80d93
ACM		 1006 /*
1007 * Queue it on the new socket if the new socket is active,
1008 * otherwise we just shortcircuit this and continue with
1009 * the new socket..
1010 */
45329e71 1011 if (nsk != sk) {
3df80d93
ACM		 1012 if (dccp_child_process(sk, nsk, skb))
1013 goto reset;
45329e71 1014 if (opt_skb != NULL)
3df80d93
ACM		 1015 __kfree_skb(opt_skb);
1016 return 0;
1017 }
1018 }
1019
1020 if (dccp_rcv_state_process(sk, skb, dccp_hdr(skb), skb->len))
1021 goto reset;
1022 return 0;
1023
1024reset:
1025 dccp_v6_ctl_send_reset(skb);
1026discard:
45329e71 1027 if (opt_skb != NULL)
3df80d93
ACM		 1028 __kfree_skb(opt_skb);
1029 kfree_skb(skb);
1030 return 0;
1031}
1032
951dbc8a 1033static int dccp_v6_rcv(struct sk_buff **pskb)
3df80d93
ACM		 1034{
1035 const struct dccp_hdr *dh;
1036 struct sk_buff *skb = *pskb;
1037 struct sock *sk;
3df80d93
ACM		 1038
1039 /* Step 1: Check header basics: */
1040
1041 if (dccp_invalid_packet(skb))
1042 goto discard_it;
1043
1044 dh = dccp_hdr(skb);
1045
1046 DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(skb);
1047 DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type;
1048
1049 if (dccp_packet_without_ack(skb))
1050 DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ;
1051 else
1052 DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb);
1053
1054 /* Step 2:
1055 * Look up flow ID in table and get corresponding socket */
1056 sk = __inet6_lookup(&dccp_hashinfo, &skb->nh.ipv6h->saddr,
1057 dh->dccph_sport,
1058 &skb->nh.ipv6h->daddr, ntohs(dh->dccph_dport),
1059 inet6_iif(skb));
45329e71 1060 /*
3df80d93
ACM		 1061 * Step 2:
1062 * If no socket ...
1063 * Generate Reset(No Connection) unless P.type == Reset
1064 * Drop packet and return
1065 */
1066 if (sk == NULL)
1067 goto no_dccp_socket;
1068
45329e71 1069 /*
3df80d93
ACM		 1070 * Step 2:
1071 * ... or S.state == TIMEWAIT,
1072 * Generate Reset(No Connection) unless P.type == Reset
1073 * Drop packet and return
1074 */
3df80d93 1075 if (sk->sk_state == DCCP_TIME_WAIT)
45329e71 1076 goto do_time_wait;
3df80d93
ACM		 1077
1078 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb))
1079 goto discard_and_relse;
1080
25995ff5 1081 return sk_receive_skb(sk, skb) ? -1 : 0;
3df80d93
ACM		 1082
1083no_dccp_socket:
1084 if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb))
1085 goto discard_it;
1086 /*
1087 * Step 2:
1088 * Generate Reset(No Connection) unless P.type == Reset
1089 * Drop packet and return
1090 */
1091 if (dh->dccph_type != DCCP_PKT_RESET) {
1092 DCCP_SKB_CB(skb)->dccpd_reset_code =
1093 DCCP_RESET_CODE_NO_CONNECTION;
1094 dccp_v6_ctl_send_reset(skb);
1095 }
1096discard_it:
1097
1098 /*
1099 * Discard frame
1100 */
1101
1102 kfree_skb(skb);
1103 return 0;
1104
1105discard_and_relse:
1106 sock_put(sk);
1107 goto discard_it;
1108
1109do_time_wait:
9469c7b4 1110 inet_twsk_put(inet_twsk(sk));
3df80d93
ACM		 1111 goto no_dccp_socket;
1112}
1113
1114static struct inet_connection_sock_af_ops dccp_ipv6_af_ops = {
543d9cfe
ACM		 1115 .queue_xmit = inet6_csk_xmit,
1116 .send_check = dccp_v6_send_check,
1117 .rebuild_header = inet6_sk_rebuild_header,
1118 .conn_request = dccp_v6_conn_request,
1119 .syn_recv_sock = dccp_v6_request_recv_sock,
1120 .net_header_len = sizeof(struct ipv6hdr),
1121 .setsockopt = ipv6_setsockopt,
1122 .getsockopt = ipv6_getsockopt,
1123 .addr2sockaddr = inet6_csk_addr2sockaddr,
1124 .sockaddr_len = sizeof(struct sockaddr_in6),
3fdadf7d 1125#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1126 .compat_setsockopt = compat_ipv6_setsockopt,
1127 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1128#endif
3df80d93
ACM		 1129};
1130
1131/*
1132 * DCCP over IPv4 via INET6 API
1133 */
1134static struct inet_connection_sock_af_ops dccp_ipv6_mapped = {
543d9cfe
ACM		 1135 .queue_xmit = ip_queue_xmit,
1136 .send_check = dccp_v4_send_check,
1137 .rebuild_header = inet_sk_rebuild_header,
1138 .conn_request = dccp_v6_conn_request,
1139 .syn_recv_sock = dccp_v6_request_recv_sock,
1140 .net_header_len = sizeof(struct iphdr),
1141 .setsockopt = ipv6_setsockopt,
1142 .getsockopt = ipv6_getsockopt,
1143 .addr2sockaddr = inet6_csk_addr2sockaddr,
1144 .sockaddr_len = sizeof(struct sockaddr_in6),
3fdadf7d 1145#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1146 .compat_setsockopt = compat_ipv6_setsockopt,
1147 .compat_getsockopt = compat_ipv6_getsockopt,
3fdadf7d 1148#endif
3df80d93
ACM		 1149};
1150
1151/* NOTE: A lot of things set to zero explicitly by call to
1152 * sk_alloc() so need not be done here.
1153 */
1154static int dccp_v6_init_sock(struct sock *sk)
1155{
72478873
ACM		 1156 static __u8 dccp_v6_ctl_sock_initialized;
1157 int err = dccp_init_sock(sk, dccp_v6_ctl_sock_initialized);
3df80d93 1158
72478873
ACM		 1159 if (err == 0) {
1160 if (unlikely(!dccp_v6_ctl_sock_initialized))
1161 dccp_v6_ctl_sock_initialized = 1;
3df80d93 1162 inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops;
72478873 1163 }
3df80d93
ACM		 1164
1165 return err;
1166}
1167
1168static int dccp_v6_destroy_sock(struct sock *sk)
1169{
3e0fadc5 1170 dccp_destroy_sock(sk);
3df80d93
ACM		 1171 return inet6_destroy_sock(sk);
1172}
1173
1174static struct proto dccp_v6_prot = {
543d9cfe
ACM		 1175 .name = "DCCPv6",
1176 .owner = THIS_MODULE,
1177 .close = dccp_close,
1178 .connect = dccp_v6_connect,
1179 .disconnect = dccp_disconnect,
1180 .ioctl = dccp_ioctl,
1181 .init = dccp_v6_init_sock,
1182 .setsockopt = dccp_setsockopt,
1183 .getsockopt = dccp_getsockopt,
1184 .sendmsg = dccp_sendmsg,
1185 .recvmsg = dccp_recvmsg,
1186 .backlog_rcv = dccp_v6_do_rcv,
1187 .hash = dccp_v6_hash,
1188 .unhash = dccp_unhash,
1189 .accept = inet_csk_accept,
1190 .get_port = dccp_v6_get_port,
1191 .shutdown = dccp_shutdown,
1192 .destroy = dccp_v6_destroy_sock,
1193 .orphan_count = &dccp_orphan_count,
1194 .max_header = MAX_DCCP_HEADER,
1195 .obj_size = sizeof(struct dccp6_sock),
1196 .rsk_prot = &dccp6_request_sock_ops,
1197 .twsk_prot = &dccp6_timewait_sock_ops,
3fdadf7d 1198#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1199 .compat_setsockopt = compat_dccp_setsockopt,
1200 .compat_getsockopt = compat_dccp_getsockopt,
3fdadf7d 1201#endif
3df80d93
ACM		 1202};
1203
1204static struct inet6_protocol dccp_v6_protocol = {
45329e71
ACM		 1205 .handler = dccp_v6_rcv,
1206 .err_handler = dccp_v6_err,
1207 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
3df80d93
ACM		 1208};
1209
1210static struct proto_ops inet6_dccp_ops = {
543d9cfe
ACM		 1211 .family = PF_INET6,
1212 .owner = THIS_MODULE,
1213 .release = inet6_release,
1214 .bind = inet6_bind,
1215 .connect = inet_stream_connect,
1216 .socketpair = sock_no_socketpair,
1217 .accept = inet_accept,
1218 .getname = inet6_getname,
1219 .poll = dccp_poll,
1220 .ioctl = inet6_ioctl,
1221 .listen = inet_dccp_listen,
1222 .shutdown = inet_shutdown,
1223 .setsockopt = sock_common_setsockopt,
1224 .getsockopt = sock_common_getsockopt,
1225 .sendmsg = inet_sendmsg,
1226 .recvmsg = sock_common_recvmsg,
1227 .mmap = sock_no_mmap,
1228 .sendpage = sock_no_sendpage,
3fdadf7d 1229#ifdef CONFIG_COMPAT
543d9cfe
ACM		 1230 .compat_setsockopt = compat_sock_common_setsockopt,
1231 .compat_getsockopt = compat_sock_common_getsockopt,
3fdadf7d 1232#endif
3df80d93
ACM		 1233};
1234
1235static struct inet_protosw dccp_v6_protosw = {
1236 .type = SOCK_DCCP,
1237 .protocol = IPPROTO_DCCP,
1238 .prot = &dccp_v6_prot,
1239 .ops = &inet6_dccp_ops,
1240 .capability = -1,
d83d8461 1241 .flags = INET_PROTOSW_ICSK,
3df80d93
ACM		 1242};
1243
1244static int __init dccp_v6_init(void)
1245{
1246 int err = proto_register(&dccp_v6_prot, 1);
1247
1248 if (err != 0)
1249 goto out;
1250
1251 err = inet6_add_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1252 if (err != 0)
1253 goto out_unregister_proto;
1254
1255 inet6_register_protosw(&dccp_v6_protosw);
72478873 1256
c4d93909
ACM		 1257 err = inet_csk_ctl_sock_create(&dccp_v6_ctl_socket, PF_INET6,
1258 SOCK_DCCP, IPPROTO_DCCP);
1259 if (err != 0)
72478873 1260 goto out_unregister_protosw;
3df80d93
ACM		 1261out:
1262 return err;
72478873
ACM		 1263out_unregister_protosw:
1264 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1265 inet6_unregister_protosw(&dccp_v6_protosw);
3df80d93
ACM		 1266out_unregister_proto:
1267 proto_unregister(&dccp_v6_prot);
1268 goto out;
1269}
1270
1271static void __exit dccp_v6_exit(void)
1272{
1273 inet6_del_protocol(&dccp_v6_protocol, IPPROTO_DCCP);
1274 inet6_unregister_protosw(&dccp_v6_protosw);
1275 proto_unregister(&dccp_v6_prot);
1276}
1277
1278module_init(dccp_v6_init);
1279module_exit(dccp_v6_exit);
1280
1281/*
1282 * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33)
1283 * values directly, Also cover the case where the protocol is not specified,
1284 * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP
1285 */
1286MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-33-type-6");
1287MODULE_ALIAS("net-pf-" __stringify(PF_INET6) "-proto-0-type-6");
1288MODULE_LICENSE("GPL");
1289MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>");
1290MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol");
Linux 6.x block layer and io_uring tree(s)