1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * DCCP over IPv6 |
4 | * Linux INET6 implementation |
5 | * |
6 | * Based on net/dccp6/ipv6.c |
7 | * |
8 | * Arnaldo Carvalho de Melo <acme@ghostprotocols.net> |
9 | */ |
10 | |
11 | #include <linux/module.h> |
12 | #include <linux/random.h> |
13 | #include <linux/slab.h> |
14 | #include <linux/xfrm.h> |
15 | #include <linux/string.h> |
16 | |
17 | #include <net/addrconf.h> |
18 | #include <net/inet_common.h> |
19 | #include <net/inet_hashtables.h> |
20 | #include <net/inet_sock.h> |
21 | #include <net/inet6_connection_sock.h> |
22 | #include <net/inet6_hashtables.h> |
23 | #include <net/ip6_route.h> |
24 | #include <net/ipv6.h> |
25 | #include <net/protocol.h> |
26 | #include <net/transp_v6.h> |
27 | #include <net/ip6_checksum.h> |
28 | #include <net/xfrm.h> |
29 | #include <net/secure_seq.h> |
30 | #include <net/netns/generic.h> |
31 | #include <net/sock.h> |
32 | |
33 | #include "dccp.h" |
34 | #include "ipv6.h" |
35 | #include "feat.h" |
36 | |
37 | struct dccp_v6_pernet { |
38 | struct sock *v6_ctl_sk; |
39 | }; |
40 | |
41 | static unsigned int dccp_v6_pernet_id __read_mostly; |
42 | |
43 | /* The per-net v6_ctl_sk is used for sending RSTs and ACKs */ |
44 | |
45 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped; |
46 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops; |
47 | |
48 | /* add pseudo-header to DCCP checksum stored in skb->csum */ |
49 | static inline __sum16 dccp_v6_csum_finish(struct sk_buff *skb, |
50 | const struct in6_addr *saddr, |
51 | const struct in6_addr *daddr) |
52 | { |
53 | return csum_ipv6_magic(saddr, daddr, len: skb->len, IPPROTO_DCCP, sum: skb->csum); |
54 | } |
55 | |
56 | static inline void dccp_v6_send_check(struct sock *sk, struct sk_buff *skb) |
57 | { |
58 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
59 | struct dccp_hdr *dh = dccp_hdr(skb); |
60 | |
61 | dccp_csum_outgoing(skb); |
62 | dh->dccph_checksum = dccp_v6_csum_finish(skb, saddr: &np->saddr, daddr: &sk->sk_v6_daddr); |
63 | } |
64 | |
65 | static inline __u64 dccp_v6_init_sequence(struct sk_buff *skb) |
66 | { |
67 | return secure_dccpv6_sequence_number(saddr: ipv6_hdr(skb)->daddr.s6_addr32, |
68 | daddr: ipv6_hdr(skb)->saddr.s6_addr32, |
69 | sport: dccp_hdr(skb)->dccph_dport, |
70 | dport: dccp_hdr(skb)->dccph_sport ); |
71 | |
72 | } |
73 | |
74 | static int dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
75 | u8 type, u8 code, int offset, __be32 info) |
76 | { |
77 | const struct ipv6hdr *hdr; |
78 | const struct dccp_hdr *dh; |
79 | struct dccp_sock *dp; |
80 | struct ipv6_pinfo *np; |
81 | struct sock *sk; |
82 | int err; |
83 | __u64 seq; |
84 | struct net *net = dev_net(dev: skb->dev); |
85 | |
86 | if (!pskb_may_pull(skb, len: offset + sizeof(*dh))) |
87 | return -EINVAL; |
88 | dh = (struct dccp_hdr *)(skb->data + offset); |
89 | if (!pskb_may_pull(skb, len: offset + __dccp_basic_hdr_len(dh))) |
90 | return -EINVAL; |
91 | hdr = (const struct ipv6hdr *)skb->data; |
92 | dh = (struct dccp_hdr *)(skb->data + offset); |
93 | |
94 | sk = __inet6_lookup_established(net, hashinfo: &dccp_hashinfo, |
95 | saddr: &hdr->daddr, sport: dh->dccph_dport, |
96 | daddr: &hdr->saddr, ntohs(dh->dccph_sport), |
97 | dif: inet6_iif(skb), sdif: 0); |
98 | |
99 | if (!sk) { |
100 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
101 | ICMP6_MIB_INERRORS); |
102 | return -ENOENT; |
103 | } |
104 | |
105 | if (sk->sk_state == DCCP_TIME_WAIT) { |
106 | inet_twsk_put(tw: inet_twsk(sk)); |
107 | return 0; |
108 | } |
109 | seq = dccp_hdr_seq(dh); |
110 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
111 | dccp_req_err(sk, seq); |
112 | return 0; |
113 | } |
114 | |
115 | bh_lock_sock(sk); |
116 | if (sock_owned_by_user(sk)) |
117 | __NET_INC_STATS(net, LINUX_MIB_LOCKDROPPEDICMPS); |
118 | |
119 | if (sk->sk_state == DCCP_CLOSED) |
120 | goto out; |
121 | |
122 | dp = dccp_sk(sk); |
123 | if ((1 << sk->sk_state) & ~(DCCPF_REQUESTING | DCCPF_LISTEN) && |
124 | !between48(seq1: seq, seq2: dp->dccps_awl, seq3: dp->dccps_awh)) { |
125 | __NET_INC_STATS(net, LINUX_MIB_OUTOFWINDOWICMPS); |
126 | goto out; |
127 | } |
128 | |
129 | np = inet6_sk(sk: sk); |
130 | |
131 | if (type == NDISC_REDIRECT) { |
132 | if (!sock_owned_by_user(sk)) { |
133 | struct dst_entry *dst = __sk_dst_check(sk, cookie: np->dst_cookie); |
134 | |
135 | if (dst) |
136 | dst->ops->redirect(dst, sk, skb); |
137 | } |
138 | goto out; |
139 | } |
140 | |
141 | if (type == ICMPV6_PKT_TOOBIG) { |
142 | struct dst_entry *dst = NULL; |
143 | |
144 | if (!ip6_sk_accept_pmtu(sk)) |
145 | goto out; |
146 | |
147 | if (sock_owned_by_user(sk)) |
148 | goto out; |
149 | if ((1 << sk->sk_state) & (DCCPF_LISTEN | DCCPF_CLOSED)) |
150 | goto out; |
151 | |
152 | dst = inet6_csk_update_pmtu(sk, ntohl(info)); |
153 | if (!dst) |
154 | goto out; |
155 | |
156 | if (inet_csk(sk)->icsk_pmtu_cookie > dst_mtu(dst)) |
157 | dccp_sync_mss(sk, pmtu: dst_mtu(dst)); |
158 | goto out; |
159 | } |
160 | |
161 | icmpv6_err_convert(type, code, err: &err); |
162 | |
163 | /* Might be for an request_sock */ |
164 | switch (sk->sk_state) { |
165 | case DCCP_REQUESTING: |
166 | case DCCP_RESPOND: /* Cannot happen. |
167 | It can, it SYNs are crossed. --ANK */ |
168 | if (!sock_owned_by_user(sk)) { |
169 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
170 | sk->sk_err = err; |
171 | /* |
172 | * Wake people up to see the error |
173 | * (see connect in sock.c) |
174 | */ |
175 | sk_error_report(sk); |
176 | dccp_done(sk); |
177 | } else { |
178 | WRITE_ONCE(sk->sk_err_soft, err); |
179 | } |
180 | goto out; |
181 | } |
182 | |
183 | if (!sock_owned_by_user(sk) && inet6_test_bit(RECVERR6, sk)) { |
184 | sk->sk_err = err; |
185 | sk_error_report(sk); |
186 | } else { |
187 | WRITE_ONCE(sk->sk_err_soft, err); |
188 | } |
189 | out: |
190 | bh_unlock_sock(sk); |
191 | sock_put(sk); |
192 | return 0; |
193 | } |
194 | |
195 | |
196 | static int dccp_v6_send_response(const struct sock *sk, struct request_sock *req) |
197 | { |
198 | struct inet_request_sock *ireq = inet_rsk(sk: req); |
199 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
200 | struct sk_buff *skb; |
201 | struct in6_addr *final_p, final; |
202 | struct flowi6 fl6; |
203 | int err = -1; |
204 | struct dst_entry *dst; |
205 | |
206 | memset(&fl6, 0, sizeof(fl6)); |
207 | fl6.flowi6_proto = IPPROTO_DCCP; |
208 | fl6.daddr = ireq->ir_v6_rmt_addr; |
209 | fl6.saddr = ireq->ir_v6_loc_addr; |
210 | fl6.flowlabel = 0; |
211 | fl6.flowi6_oif = ireq->ir_iif; |
212 | fl6.fl6_dport = ireq->ir_rmt_port; |
213 | fl6.fl6_sport = htons(ireq->ir_num); |
214 | security_req_classify_flow(req, flic: flowi6_to_flowi_common(fl6: &fl6)); |
215 | |
216 | |
217 | rcu_read_lock(); |
218 | final_p = fl6_update_dst(fl6: &fl6, rcu_dereference(np->opt), orig: &final); |
219 | rcu_read_unlock(); |
220 | |
221 | dst = ip6_dst_lookup_flow(net: sock_net(sk), sk, fl6: &fl6, final_dst: final_p); |
222 | if (IS_ERR(ptr: dst)) { |
223 | err = PTR_ERR(ptr: dst); |
224 | dst = NULL; |
225 | goto done; |
226 | } |
227 | |
228 | skb = dccp_make_response(sk, dst, req); |
229 | if (skb != NULL) { |
230 | struct dccp_hdr *dh = dccp_hdr(skb); |
231 | struct ipv6_txoptions *opt; |
232 | |
233 | dh->dccph_checksum = dccp_v6_csum_finish(skb, |
234 | saddr: &ireq->ir_v6_loc_addr, |
235 | daddr: &ireq->ir_v6_rmt_addr); |
236 | fl6.daddr = ireq->ir_v6_rmt_addr; |
237 | rcu_read_lock(); |
238 | opt = ireq->ipv6_opt; |
239 | if (!opt) |
240 | opt = rcu_dereference(np->opt); |
241 | err = ip6_xmit(sk, skb, fl6: &fl6, READ_ONCE(sk->sk_mark), opt, |
242 | tclass: np->tclass, READ_ONCE(sk->sk_priority)); |
243 | rcu_read_unlock(); |
244 | err = net_xmit_eval(err); |
245 | } |
246 | |
247 | done: |
248 | dst_release(dst); |
249 | return err; |
250 | } |
251 | |
252 | static void dccp_v6_reqsk_destructor(struct request_sock *req) |
253 | { |
254 | dccp_feat_list_purge(fn_list: &dccp_rsk(req)->dreq_featneg); |
255 | kfree(objp: inet_rsk(sk: req)->ipv6_opt); |
256 | kfree_skb(skb: inet_rsk(sk: req)->pktopts); |
257 | } |
258 | |
259 | static void dccp_v6_ctl_send_reset(const struct sock *sk, struct sk_buff *rxskb) |
260 | { |
261 | const struct ipv6hdr *rxip6h; |
262 | struct sk_buff *skb; |
263 | struct flowi6 fl6; |
264 | struct net *net = dev_net(dev: skb_dst(skb: rxskb)->dev); |
265 | struct dccp_v6_pernet *pn; |
266 | struct sock *ctl_sk; |
267 | struct dst_entry *dst; |
268 | |
269 | if (dccp_hdr(skb: rxskb)->dccph_type == DCCP_PKT_RESET) |
270 | return; |
271 | |
272 | if (!ipv6_unicast_destination(skb: rxskb)) |
273 | return; |
274 | |
275 | pn = net_generic(net, id: dccp_v6_pernet_id); |
276 | ctl_sk = pn->v6_ctl_sk; |
277 | skb = dccp_ctl_make_reset(sk: ctl_sk, skb: rxskb); |
278 | if (skb == NULL) |
279 | return; |
280 | |
281 | rxip6h = ipv6_hdr(skb: rxskb); |
282 | dccp_hdr(skb)->dccph_checksum = dccp_v6_csum_finish(skb, saddr: &rxip6h->saddr, |
283 | daddr: &rxip6h->daddr); |
284 | |
285 | memset(&fl6, 0, sizeof(fl6)); |
286 | fl6.daddr = rxip6h->saddr; |
287 | fl6.saddr = rxip6h->daddr; |
288 | |
289 | fl6.flowi6_proto = IPPROTO_DCCP; |
290 | fl6.flowi6_oif = inet6_iif(skb: rxskb); |
291 | fl6.fl6_dport = dccp_hdr(skb)->dccph_dport; |
292 | fl6.fl6_sport = dccp_hdr(skb)->dccph_sport; |
293 | security_skb_classify_flow(skb: rxskb, flic: flowi6_to_flowi_common(fl6: &fl6)); |
294 | |
295 | /* sk = NULL, but it is safe for now. RST socket required. */ |
296 | dst = ip6_dst_lookup_flow(net: sock_net(sk: ctl_sk), sk: ctl_sk, fl6: &fl6, NULL); |
297 | if (!IS_ERR(ptr: dst)) { |
298 | skb_dst_set(skb, dst); |
299 | ip6_xmit(sk: ctl_sk, skb, fl6: &fl6, mark: 0, NULL, tclass: 0, priority: 0); |
300 | DCCP_INC_STATS(DCCP_MIB_OUTSEGS); |
301 | DCCP_INC_STATS(DCCP_MIB_OUTRSTS); |
302 | return; |
303 | } |
304 | |
305 | kfree_skb(skb); |
306 | } |
307 | |
308 | static struct request_sock_ops dccp6_request_sock_ops = { |
309 | .family = AF_INET6, |
310 | .obj_size = sizeof(struct dccp6_request_sock), |
311 | .rtx_syn_ack = dccp_v6_send_response, |
312 | .send_ack = dccp_reqsk_send_ack, |
313 | .destructor = dccp_v6_reqsk_destructor, |
314 | .send_reset = dccp_v6_ctl_send_reset, |
315 | .syn_ack_timeout = dccp_syn_ack_timeout, |
316 | }; |
317 | |
318 | static int dccp_v6_conn_request(struct sock *sk, struct sk_buff *skb) |
319 | { |
320 | struct request_sock *req; |
321 | struct dccp_request_sock *dreq; |
322 | struct inet_request_sock *ireq; |
323 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
324 | const __be32 service = dccp_hdr_request(skb)->dccph_req_service; |
325 | struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); |
326 | |
327 | if (skb->protocol == htons(ETH_P_IP)) |
328 | return dccp_v4_conn_request(sk, skb); |
329 | |
330 | if (!ipv6_unicast_destination(skb)) |
331 | return 0; /* discard, don't send a reset here */ |
332 | |
333 | if (ipv6_addr_v4mapped(a: &ipv6_hdr(skb)->saddr)) { |
334 | __IP6_INC_STATS(sock_net(sk), NULL, IPSTATS_MIB_INHDRERRORS); |
335 | return 0; |
336 | } |
337 | |
338 | if (dccp_bad_service_code(sk, service)) { |
339 | dcb->dccpd_reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; |
340 | goto drop; |
341 | } |
342 | /* |
343 | * There are no SYN attacks on IPv6, yet... |
344 | */ |
345 | dcb->dccpd_reset_code = DCCP_RESET_CODE_TOO_BUSY; |
346 | if (inet_csk_reqsk_queue_is_full(sk)) |
347 | goto drop; |
348 | |
349 | if (sk_acceptq_is_full(sk)) |
350 | goto drop; |
351 | |
352 | req = inet_reqsk_alloc(ops: &dccp6_request_sock_ops, sk_listener: sk, attach_listener: true); |
353 | if (req == NULL) |
354 | goto drop; |
355 | |
356 | if (dccp_reqsk_init(rq: req, dccp_sk(sk), skb)) |
357 | goto drop_and_free; |
358 | |
359 | dreq = dccp_rsk(req); |
360 | if (dccp_parse_options(sk, dreq, skb)) |
361 | goto drop_and_free; |
362 | |
363 | if (security_inet_conn_request(sk, skb, req)) |
364 | goto drop_and_free; |
365 | |
366 | ireq = inet_rsk(sk: req); |
367 | ireq->ir_v6_rmt_addr = ipv6_hdr(skb)->saddr; |
368 | ireq->ir_v6_loc_addr = ipv6_hdr(skb)->daddr; |
369 | ireq->ireq_family = AF_INET6; |
370 | ireq->ir_mark = inet_request_mark(sk, skb); |
371 | |
372 | if (ipv6_opt_accepted(sk, skb, IP6CB(skb)) || |
373 | np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo || |
374 | np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) { |
375 | refcount_inc(r: &skb->users); |
376 | ireq->pktopts = skb; |
377 | } |
378 | ireq->ir_iif = READ_ONCE(sk->sk_bound_dev_if); |
379 | |
380 | /* So that link locals have meaning */ |
381 | if (!ireq->ir_iif && |
382 | ipv6_addr_type(addr: &ireq->ir_v6_rmt_addr) & IPV6_ADDR_LINKLOCAL) |
383 | ireq->ir_iif = inet6_iif(skb); |
384 | |
385 | /* |
386 | * Step 3: Process LISTEN state |
387 | * |
388 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie |
389 | * |
390 | * Setting S.SWL/S.SWH to is deferred to dccp_create_openreq_child(). |
391 | */ |
392 | dreq->dreq_isr = dcb->dccpd_seq; |
393 | dreq->dreq_gsr = dreq->dreq_isr; |
394 | dreq->dreq_iss = dccp_v6_init_sequence(skb); |
395 | dreq->dreq_gss = dreq->dreq_iss; |
396 | dreq->dreq_service = service; |
397 | |
398 | if (dccp_v6_send_response(sk, req)) |
399 | goto drop_and_free; |
400 | |
401 | inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); |
402 | reqsk_put(req); |
403 | return 0; |
404 | |
405 | drop_and_free: |
406 | reqsk_free(req); |
407 | drop: |
408 | __DCCP_INC_STATS(DCCP_MIB_ATTEMPTFAILS); |
409 | return -1; |
410 | } |
411 | |
412 | static struct sock *dccp_v6_request_recv_sock(const struct sock *sk, |
413 | struct sk_buff *skb, |
414 | struct request_sock *req, |
415 | struct dst_entry *dst, |
416 | struct request_sock *req_unhash, |
417 | bool *own_req) |
418 | { |
419 | struct inet_request_sock *ireq = inet_rsk(sk: req); |
420 | struct ipv6_pinfo *newnp; |
421 | const struct ipv6_pinfo *np = inet6_sk(sk: sk); |
422 | struct ipv6_txoptions *opt; |
423 | struct inet_sock *newinet; |
424 | struct dccp6_sock *newdp6; |
425 | struct sock *newsk; |
426 | |
427 | if (skb->protocol == htons(ETH_P_IP)) { |
428 | /* |
429 | * v6 mapped |
430 | */ |
431 | newsk = dccp_v4_request_recv_sock(sk, skb, req, dst, |
432 | req_unhash, own_req); |
433 | if (newsk == NULL) |
434 | return NULL; |
435 | |
436 | newdp6 = (struct dccp6_sock *)newsk; |
437 | newinet = inet_sk(newsk); |
438 | newinet->pinet6 = &newdp6->inet6; |
439 | newnp = inet6_sk(sk: newsk); |
440 | |
441 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
442 | |
443 | newnp->saddr = newsk->sk_v6_rcv_saddr; |
444 | |
445 | inet_csk(sk: newsk)->icsk_af_ops = &dccp_ipv6_mapped; |
446 | newsk->sk_backlog_rcv = dccp_v4_do_rcv; |
447 | newnp->pktoptions = NULL; |
448 | newnp->opt = NULL; |
449 | newnp->ipv6_mc_list = NULL; |
450 | newnp->ipv6_ac_list = NULL; |
451 | newnp->ipv6_fl_list = NULL; |
452 | newnp->mcast_oif = inet_iif(skb); |
453 | newnp->mcast_hops = ip_hdr(skb)->ttl; |
454 | |
455 | /* |
456 | * No need to charge this sock to the relevant IPv6 refcnt debug socks count |
457 | * here, dccp_create_openreq_child now does this for us, see the comment in |
458 | * that function for the gory details. -acme |
459 | */ |
460 | |
461 | /* It is tricky place. Until this moment IPv4 tcp |
462 | worked with IPv6 icsk.icsk_af_ops. |
463 | Sync it now. |
464 | */ |
465 | dccp_sync_mss(sk: newsk, pmtu: inet_csk(sk: newsk)->icsk_pmtu_cookie); |
466 | |
467 | return newsk; |
468 | } |
469 | |
470 | |
471 | if (sk_acceptq_is_full(sk)) |
472 | goto out_overflow; |
473 | |
474 | if (!dst) { |
475 | struct flowi6 fl6; |
476 | |
477 | dst = inet6_csk_route_req(sk, fl6: &fl6, req, IPPROTO_DCCP); |
478 | if (!dst) |
479 | goto out; |
480 | } |
481 | |
482 | newsk = dccp_create_openreq_child(sk, req, skb); |
483 | if (newsk == NULL) |
484 | goto out_nonewsk; |
485 | |
486 | /* |
487 | * No need to charge this sock to the relevant IPv6 refcnt debug socks |
488 | * count here, dccp_create_openreq_child now does this for us, see the |
489 | * comment in that function for the gory details. -acme |
490 | */ |
491 | |
492 | ip6_dst_store(sk: newsk, dst, NULL, NULL); |
493 | newsk->sk_route_caps = dst->dev->features & ~(NETIF_F_IP_CSUM | |
494 | NETIF_F_TSO); |
495 | newdp6 = (struct dccp6_sock *)newsk; |
496 | newinet = inet_sk(newsk); |
497 | newinet->pinet6 = &newdp6->inet6; |
498 | newnp = inet6_sk(sk: newsk); |
499 | |
500 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
501 | |
502 | newsk->sk_v6_daddr = ireq->ir_v6_rmt_addr; |
503 | newnp->saddr = ireq->ir_v6_loc_addr; |
504 | newsk->sk_v6_rcv_saddr = ireq->ir_v6_loc_addr; |
505 | newsk->sk_bound_dev_if = ireq->ir_iif; |
506 | |
507 | /* Now IPv6 options... |
508 | |
509 | First: no IPv4 options. |
510 | */ |
511 | newinet->inet_opt = NULL; |
512 | |
513 | /* Clone RX bits */ |
514 | newnp->rxopt.all = np->rxopt.all; |
515 | |
516 | newnp->ipv6_mc_list = NULL; |
517 | newnp->ipv6_ac_list = NULL; |
518 | newnp->ipv6_fl_list = NULL; |
519 | newnp->pktoptions = NULL; |
520 | newnp->opt = NULL; |
521 | newnp->mcast_oif = inet6_iif(skb); |
522 | newnp->mcast_hops = ipv6_hdr(skb)->hop_limit; |
523 | |
524 | /* |
525 | * Clone native IPv6 options from listening socket (if any) |
526 | * |
527 | * Yes, keeping reference count would be much more clever, but we make |
528 | * one more one thing there: reattach optmem to newsk. |
529 | */ |
530 | opt = ireq->ipv6_opt; |
531 | if (!opt) |
532 | opt = rcu_dereference(np->opt); |
533 | if (opt) { |
534 | opt = ipv6_dup_options(sk: newsk, opt); |
535 | RCU_INIT_POINTER(newnp->opt, opt); |
536 | } |
537 | inet_csk(sk: newsk)->icsk_ext_hdr_len = 0; |
538 | if (opt) |
539 | inet_csk(sk: newsk)->icsk_ext_hdr_len = opt->opt_nflen + |
540 | opt->opt_flen; |
541 | |
542 | dccp_sync_mss(sk: newsk, pmtu: dst_mtu(dst)); |
543 | |
544 | newinet->inet_daddr = newinet->inet_saddr = LOOPBACK4_IPV6; |
545 | newinet->inet_rcv_saddr = LOOPBACK4_IPV6; |
546 | |
547 | if (__inet_inherit_port(sk, child: newsk) < 0) { |
548 | inet_csk_prepare_forced_close(sk: newsk); |
549 | dccp_done(sk: newsk); |
550 | goto out; |
551 | } |
552 | *own_req = inet_ehash_nolisten(sk: newsk, osk: req_to_sk(req: req_unhash), NULL); |
553 | /* Clone pktoptions received with SYN, if we own the req */ |
554 | if (*own_req && ireq->pktopts) { |
555 | newnp->pktoptions = skb_clone_and_charge_r(skb: ireq->pktopts, sk: newsk); |
556 | consume_skb(skb: ireq->pktopts); |
557 | ireq->pktopts = NULL; |
558 | } |
559 | |
560 | return newsk; |
561 | |
562 | out_overflow: |
563 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENOVERFLOWS); |
564 | out_nonewsk: |
565 | dst_release(dst); |
566 | out: |
567 | __NET_INC_STATS(sock_net(sk), LINUX_MIB_LISTENDROPS); |
568 | return NULL; |
569 | } |
570 | |
571 | /* The socket must have it's spinlock held when we get |
572 | * here. |
573 | * |
574 | * We have a potential double-lock case here, so even when |
575 | * doing backlog processing we use the BH locking scheme. |
576 | * This is because we cannot sleep with the original spinlock |
577 | * held. |
578 | */ |
579 | static int dccp_v6_do_rcv(struct sock *sk, struct sk_buff *skb) |
580 | { |
581 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
582 | struct sk_buff *opt_skb = NULL; |
583 | |
584 | /* Imagine: socket is IPv6. IPv4 packet arrives, |
585 | goes to IPv4 receive handler and backlogged. |
586 | From backlog it always goes here. Kerboom... |
587 | Fortunately, dccp_rcv_established and rcv_established |
588 | handle them correctly, but it is not case with |
589 | dccp_v6_hnd_req and dccp_v6_ctl_send_reset(). --ANK |
590 | */ |
591 | |
592 | if (skb->protocol == htons(ETH_P_IP)) |
593 | return dccp_v4_do_rcv(sk, skb); |
594 | |
595 | if (sk_filter(sk, skb)) |
596 | goto discard; |
597 | |
598 | /* |
599 | * socket locking is here for SMP purposes as backlog rcv is currently |
600 | * called with bh processing disabled. |
601 | */ |
602 | |
603 | /* Do Stevens' IPV6_PKTOPTIONS. |
604 | |
605 | Yes, guys, it is the only place in our code, where we |
606 | may make it not affecting IPv4. |
607 | The rest of code is protocol independent, |
608 | and I do not like idea to uglify IPv4. |
609 | |
610 | Actually, all the idea behind IPV6_PKTOPTIONS |
611 | looks not very well thought. For now we latch |
612 | options, received in the last packet, enqueued |
613 | by tcp. Feel free to propose better solution. |
614 | --ANK (980728) |
615 | */ |
616 | if (np->rxopt.all) |
617 | opt_skb = skb_clone_and_charge_r(skb, sk); |
618 | |
619 | if (sk->sk_state == DCCP_OPEN) { /* Fast path */ |
620 | if (dccp_rcv_established(sk, skb, dh: dccp_hdr(skb), len: skb->len)) |
621 | goto reset; |
622 | if (opt_skb) |
623 | goto ipv6_pktoptions; |
624 | return 0; |
625 | } |
626 | |
627 | /* |
628 | * Step 3: Process LISTEN state |
629 | * If S.state == LISTEN, |
630 | * If P.type == Request or P contains a valid Init Cookie option, |
631 | * (* Must scan the packet's options to check for Init |
632 | * Cookies. Only Init Cookies are processed here, |
633 | * however; other options are processed in Step 8. This |
634 | * scan need only be performed if the endpoint uses Init |
635 | * Cookies *) |
636 | * (* Generate a new socket and switch to that socket *) |
637 | * Set S := new socket for this port pair |
638 | * S.state = RESPOND |
639 | * Choose S.ISS (initial seqno) or set from Init Cookies |
640 | * Initialize S.GAR := S.ISS |
641 | * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookies |
642 | * Continue with S.state == RESPOND |
643 | * (* A Response packet will be generated in Step 11 *) |
644 | * Otherwise, |
645 | * Generate Reset(No Connection) unless P.type == Reset |
646 | * Drop packet and return |
647 | * |
648 | * NOTE: the check for the packet types is done in |
649 | * dccp_rcv_state_process |
650 | */ |
651 | |
652 | if (dccp_rcv_state_process(sk, skb, dh: dccp_hdr(skb), len: skb->len)) |
653 | goto reset; |
654 | if (opt_skb) |
655 | goto ipv6_pktoptions; |
656 | return 0; |
657 | |
658 | reset: |
659 | dccp_v6_ctl_send_reset(sk, rxskb: skb); |
660 | discard: |
661 | if (opt_skb != NULL) |
662 | __kfree_skb(skb: opt_skb); |
663 | kfree_skb(skb); |
664 | return 0; |
665 | |
666 | /* Handling IPV6_PKTOPTIONS skb the similar |
667 | * way it's done for net/ipv6/tcp_ipv6.c |
668 | */ |
669 | ipv6_pktoptions: |
670 | if (!((1 << sk->sk_state) & (DCCPF_CLOSED | DCCPF_LISTEN))) { |
671 | if (np->rxopt.bits.rxinfo || np->rxopt.bits.rxoinfo) |
672 | np->mcast_oif = inet6_iif(skb: opt_skb); |
673 | if (np->rxopt.bits.rxhlim || np->rxopt.bits.rxohlim) |
674 | WRITE_ONCE(np->mcast_hops, ipv6_hdr(opt_skb)->hop_limit); |
675 | if (np->rxopt.bits.rxflow || np->rxopt.bits.rxtclass) |
676 | np->rcv_flowinfo = ip6_flowinfo(hdr: ipv6_hdr(skb: opt_skb)); |
677 | if (inet6_test_bit(REPFLOW, sk)) |
678 | np->flow_label = ip6_flowlabel(hdr: ipv6_hdr(skb: opt_skb)); |
679 | if (ipv6_opt_accepted(sk, skb: opt_skb, |
680 | opt: &DCCP_SKB_CB(opt_skb)->header.h6)) { |
681 | memmove(IP6CB(opt_skb), |
682 | &DCCP_SKB_CB(opt_skb)->header.h6, |
683 | sizeof(struct inet6_skb_parm)); |
684 | opt_skb = xchg(&np->pktoptions, opt_skb); |
685 | } else { |
686 | __kfree_skb(skb: opt_skb); |
687 | opt_skb = xchg(&np->pktoptions, NULL); |
688 | } |
689 | } |
690 | |
691 | kfree_skb(skb: opt_skb); |
692 | return 0; |
693 | } |
694 | |
695 | static int dccp_v6_rcv(struct sk_buff *skb) |
696 | { |
697 | const struct dccp_hdr *dh; |
698 | bool refcounted; |
699 | struct sock *sk; |
700 | int min_cov; |
701 | |
702 | /* Step 1: Check header basics */ |
703 | |
704 | if (dccp_invalid_packet(skb)) |
705 | goto discard_it; |
706 | |
707 | /* Step 1: If header checksum is incorrect, drop packet and return. */ |
708 | if (dccp_v6_csum_finish(skb, saddr: &ipv6_hdr(skb)->saddr, |
709 | daddr: &ipv6_hdr(skb)->daddr)) { |
710 | DCCP_WARN("dropped packet with invalid checksum\n" ); |
711 | goto discard_it; |
712 | } |
713 | |
714 | dh = dccp_hdr(skb); |
715 | |
716 | DCCP_SKB_CB(skb)->dccpd_seq = dccp_hdr_seq(dh); |
717 | DCCP_SKB_CB(skb)->dccpd_type = dh->dccph_type; |
718 | |
719 | if (dccp_packet_without_ack(skb)) |
720 | DCCP_SKB_CB(skb)->dccpd_ack_seq = DCCP_PKT_WITHOUT_ACK_SEQ; |
721 | else |
722 | DCCP_SKB_CB(skb)->dccpd_ack_seq = dccp_hdr_ack_seq(skb); |
723 | |
724 | lookup: |
725 | sk = __inet6_lookup_skb(hashinfo: &dccp_hashinfo, skb, doff: __dccp_hdr_len(dh), |
726 | sport: dh->dccph_sport, dport: dh->dccph_dport, |
727 | iif: inet6_iif(skb), sdif: 0, refcounted: &refcounted); |
728 | if (!sk) { |
729 | dccp_pr_debug("failed to look up flow ID in table and " |
730 | "get corresponding socket\n" ); |
731 | goto no_dccp_socket; |
732 | } |
733 | |
734 | /* |
735 | * Step 2: |
736 | * ... or S.state == TIMEWAIT, |
737 | * Generate Reset(No Connection) unless P.type == Reset |
738 | * Drop packet and return |
739 | */ |
740 | if (sk->sk_state == DCCP_TIME_WAIT) { |
741 | dccp_pr_debug("sk->sk_state == DCCP_TIME_WAIT: do_time_wait\n" ); |
742 | inet_twsk_put(tw: inet_twsk(sk)); |
743 | goto no_dccp_socket; |
744 | } |
745 | |
746 | if (sk->sk_state == DCCP_NEW_SYN_RECV) { |
747 | struct request_sock *req = inet_reqsk(sk); |
748 | struct sock *nsk; |
749 | |
750 | sk = req->rsk_listener; |
751 | if (unlikely(sk->sk_state != DCCP_LISTEN)) { |
752 | inet_csk_reqsk_queue_drop_and_put(sk, req); |
753 | goto lookup; |
754 | } |
755 | sock_hold(sk); |
756 | refcounted = true; |
757 | nsk = dccp_check_req(sk, skb, req); |
758 | if (!nsk) { |
759 | reqsk_put(req); |
760 | goto discard_and_relse; |
761 | } |
762 | if (nsk == sk) { |
763 | reqsk_put(req); |
764 | } else if (dccp_child_process(parent: sk, child: nsk, skb)) { |
765 | dccp_v6_ctl_send_reset(sk, rxskb: skb); |
766 | goto discard_and_relse; |
767 | } else { |
768 | sock_put(sk); |
769 | return 0; |
770 | } |
771 | } |
772 | /* |
773 | * RFC 4340, sec. 9.2.1: Minimum Checksum Coverage |
774 | * o if MinCsCov = 0, only packets with CsCov = 0 are accepted |
775 | * o if MinCsCov > 0, also accept packets with CsCov >= MinCsCov |
776 | */ |
777 | min_cov = dccp_sk(sk)->dccps_pcrlen; |
778 | if (dh->dccph_cscov && (min_cov == 0 || dh->dccph_cscov < min_cov)) { |
779 | dccp_pr_debug("Packet CsCov %d does not satisfy MinCsCov %d\n" , |
780 | dh->dccph_cscov, min_cov); |
781 | /* FIXME: send Data Dropped option (see also dccp_v4_rcv) */ |
782 | goto discard_and_relse; |
783 | } |
784 | |
785 | if (!xfrm6_policy_check(sk, dir: XFRM_POLICY_IN, skb)) |
786 | goto discard_and_relse; |
787 | nf_reset_ct(skb); |
788 | |
789 | return __sk_receive_skb(sk, skb, nested: 1, trim_cap: dh->dccph_doff * 4, |
790 | refcounted) ? -1 : 0; |
791 | |
792 | no_dccp_socket: |
793 | if (!xfrm6_policy_check(NULL, dir: XFRM_POLICY_IN, skb)) |
794 | goto discard_it; |
795 | /* |
796 | * Step 2: |
797 | * If no socket ... |
798 | * Generate Reset(No Connection) unless P.type == Reset |
799 | * Drop packet and return |
800 | */ |
801 | if (dh->dccph_type != DCCP_PKT_RESET) { |
802 | DCCP_SKB_CB(skb)->dccpd_reset_code = |
803 | DCCP_RESET_CODE_NO_CONNECTION; |
804 | dccp_v6_ctl_send_reset(sk, rxskb: skb); |
805 | } |
806 | |
807 | discard_it: |
808 | kfree_skb(skb); |
809 | return 0; |
810 | |
811 | discard_and_relse: |
812 | if (refcounted) |
813 | sock_put(sk); |
814 | goto discard_it; |
815 | } |
816 | |
817 | static int dccp_v6_connect(struct sock *sk, struct sockaddr *uaddr, |
818 | int addr_len) |
819 | { |
820 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *)uaddr; |
821 | struct inet_connection_sock *icsk = inet_csk(sk); |
822 | struct inet_sock *inet = inet_sk(sk); |
823 | struct ipv6_pinfo *np = inet6_sk(sk: sk); |
824 | struct dccp_sock *dp = dccp_sk(sk); |
825 | struct in6_addr *saddr = NULL, *final_p, final; |
826 | struct ipv6_txoptions *opt; |
827 | struct flowi6 fl6; |
828 | struct dst_entry *dst; |
829 | int addr_type; |
830 | int err; |
831 | |
832 | dp->dccps_role = DCCP_ROLE_CLIENT; |
833 | |
834 | if (addr_len < SIN6_LEN_RFC2133) |
835 | return -EINVAL; |
836 | |
837 | if (usin->sin6_family != AF_INET6) |
838 | return -EAFNOSUPPORT; |
839 | |
840 | memset(&fl6, 0, sizeof(fl6)); |
841 | |
842 | if (inet6_test_bit(SNDFLOW, sk)) { |
843 | fl6.flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
844 | IP6_ECN_flow_init(fl6.flowlabel); |
845 | if (fl6.flowlabel & IPV6_FLOWLABEL_MASK) { |
846 | struct ip6_flowlabel *flowlabel; |
847 | flowlabel = fl6_sock_lookup(sk, label: fl6.flowlabel); |
848 | if (IS_ERR(ptr: flowlabel)) |
849 | return -EINVAL; |
850 | fl6_sock_release(fl: flowlabel); |
851 | } |
852 | } |
853 | /* |
854 | * connect() to INADDR_ANY means loopback (BSD'ism). |
855 | */ |
856 | if (ipv6_addr_any(a: &usin->sin6_addr)) |
857 | usin->sin6_addr.s6_addr[15] = 1; |
858 | |
859 | addr_type = ipv6_addr_type(addr: &usin->sin6_addr); |
860 | |
861 | if (addr_type & IPV6_ADDR_MULTICAST) |
862 | return -ENETUNREACH; |
863 | |
864 | if (addr_type & IPV6_ADDR_LINKLOCAL) { |
865 | if (addr_len >= sizeof(struct sockaddr_in6) && |
866 | usin->sin6_scope_id) { |
867 | /* If interface is set while binding, indices |
868 | * must coincide. |
869 | */ |
870 | if (sk->sk_bound_dev_if && |
871 | sk->sk_bound_dev_if != usin->sin6_scope_id) |
872 | return -EINVAL; |
873 | |
874 | sk->sk_bound_dev_if = usin->sin6_scope_id; |
875 | } |
876 | |
877 | /* Connect to link-local address requires an interface */ |
878 | if (!sk->sk_bound_dev_if) |
879 | return -EINVAL; |
880 | } |
881 | |
882 | sk->sk_v6_daddr = usin->sin6_addr; |
883 | np->flow_label = fl6.flowlabel; |
884 | |
885 | /* |
886 | * DCCP over IPv4 |
887 | */ |
888 | if (addr_type == IPV6_ADDR_MAPPED) { |
889 | u32 exthdrlen = icsk->icsk_ext_hdr_len; |
890 | struct sockaddr_in sin; |
891 | |
892 | SOCK_DEBUG(sk, "connect: ipv4 mapped\n" ); |
893 | |
894 | if (ipv6_only_sock(sk)) |
895 | return -ENETUNREACH; |
896 | |
897 | sin.sin_family = AF_INET; |
898 | sin.sin_port = usin->sin6_port; |
899 | sin.sin_addr.s_addr = usin->sin6_addr.s6_addr32[3]; |
900 | |
901 | icsk->icsk_af_ops = &dccp_ipv6_mapped; |
902 | sk->sk_backlog_rcv = dccp_v4_do_rcv; |
903 | |
904 | err = dccp_v4_connect(sk, uaddr: (struct sockaddr *)&sin, addr_len: sizeof(sin)); |
905 | if (err) { |
906 | icsk->icsk_ext_hdr_len = exthdrlen; |
907 | icsk->icsk_af_ops = &dccp_ipv6_af_ops; |
908 | sk->sk_backlog_rcv = dccp_v6_do_rcv; |
909 | goto failure; |
910 | } |
911 | np->saddr = sk->sk_v6_rcv_saddr; |
912 | return err; |
913 | } |
914 | |
915 | if (!ipv6_addr_any(a: &sk->sk_v6_rcv_saddr)) |
916 | saddr = &sk->sk_v6_rcv_saddr; |
917 | |
918 | fl6.flowi6_proto = IPPROTO_DCCP; |
919 | fl6.daddr = sk->sk_v6_daddr; |
920 | fl6.saddr = saddr ? *saddr : np->saddr; |
921 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
922 | fl6.fl6_dport = usin->sin6_port; |
923 | fl6.fl6_sport = inet->inet_sport; |
924 | security_sk_classify_flow(sk, flic: flowi6_to_flowi_common(fl6: &fl6)); |
925 | |
926 | opt = rcu_dereference_protected(np->opt, lockdep_sock_is_held(sk)); |
927 | final_p = fl6_update_dst(fl6: &fl6, opt, orig: &final); |
928 | |
929 | dst = ip6_dst_lookup_flow(net: sock_net(sk), sk, fl6: &fl6, final_dst: final_p); |
930 | if (IS_ERR(ptr: dst)) { |
931 | err = PTR_ERR(ptr: dst); |
932 | goto failure; |
933 | } |
934 | |
935 | if (saddr == NULL) { |
936 | saddr = &fl6.saddr; |
937 | |
938 | err = inet_bhash2_update_saddr(sk, saddr, AF_INET6); |
939 | if (err) |
940 | goto failure; |
941 | } |
942 | |
943 | /* set the source address */ |
944 | np->saddr = *saddr; |
945 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
946 | |
947 | ip6_dst_store(sk, dst, NULL, NULL); |
948 | |
949 | icsk->icsk_ext_hdr_len = 0; |
950 | if (opt) |
951 | icsk->icsk_ext_hdr_len = opt->opt_flen + opt->opt_nflen; |
952 | |
953 | inet->inet_dport = usin->sin6_port; |
954 | |
955 | dccp_set_state(sk, state: DCCP_REQUESTING); |
956 | err = inet6_hash_connect(death_row: &dccp_death_row, sk); |
957 | if (err) |
958 | goto late_failure; |
959 | |
960 | dp->dccps_iss = secure_dccpv6_sequence_number(saddr: np->saddr.s6_addr32, |
961 | daddr: sk->sk_v6_daddr.s6_addr32, |
962 | sport: inet->inet_sport, |
963 | dport: inet->inet_dport); |
964 | err = dccp_connect(sk); |
965 | if (err) |
966 | goto late_failure; |
967 | |
968 | return 0; |
969 | |
970 | late_failure: |
971 | dccp_set_state(sk, state: DCCP_CLOSED); |
972 | inet_bhash2_reset_saddr(sk); |
973 | __sk_dst_reset(sk); |
974 | failure: |
975 | inet->inet_dport = 0; |
976 | sk->sk_route_caps = 0; |
977 | return err; |
978 | } |
979 | |
980 | static const struct inet_connection_sock_af_ops dccp_ipv6_af_ops = { |
981 | .queue_xmit = inet6_csk_xmit, |
982 | .send_check = dccp_v6_send_check, |
983 | .rebuild_header = inet6_sk_rebuild_header, |
984 | .conn_request = dccp_v6_conn_request, |
985 | .syn_recv_sock = dccp_v6_request_recv_sock, |
986 | .net_header_len = sizeof(struct ipv6hdr), |
987 | .setsockopt = ipv6_setsockopt, |
988 | .getsockopt = ipv6_getsockopt, |
989 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
990 | .sockaddr_len = sizeof(struct sockaddr_in6), |
991 | }; |
992 | |
993 | /* |
994 | * DCCP over IPv4 via INET6 API |
995 | */ |
996 | static const struct inet_connection_sock_af_ops dccp_ipv6_mapped = { |
997 | .queue_xmit = ip_queue_xmit, |
998 | .send_check = dccp_v4_send_check, |
999 | .rebuild_header = inet_sk_rebuild_header, |
1000 | .conn_request = dccp_v6_conn_request, |
1001 | .syn_recv_sock = dccp_v6_request_recv_sock, |
1002 | .net_header_len = sizeof(struct iphdr), |
1003 | .setsockopt = ipv6_setsockopt, |
1004 | .getsockopt = ipv6_getsockopt, |
1005 | .addr2sockaddr = inet6_csk_addr2sockaddr, |
1006 | .sockaddr_len = sizeof(struct sockaddr_in6), |
1007 | }; |
1008 | |
1009 | static void dccp_v6_sk_destruct(struct sock *sk) |
1010 | { |
1011 | dccp_destruct_common(sk); |
1012 | inet6_sock_destruct(sk); |
1013 | } |
1014 | |
1015 | /* NOTE: A lot of things set to zero explicitly by call to |
1016 | * sk_alloc() so need not be done here. |
1017 | */ |
1018 | static int dccp_v6_init_sock(struct sock *sk) |
1019 | { |
1020 | static __u8 dccp_v6_ctl_sock_initialized; |
1021 | int err = dccp_init_sock(sk, ctl_sock_initialized: dccp_v6_ctl_sock_initialized); |
1022 | |
1023 | if (err == 0) { |
1024 | if (unlikely(!dccp_v6_ctl_sock_initialized)) |
1025 | dccp_v6_ctl_sock_initialized = 1; |
1026 | inet_csk(sk)->icsk_af_ops = &dccp_ipv6_af_ops; |
1027 | sk->sk_destruct = dccp_v6_sk_destruct; |
1028 | } |
1029 | |
1030 | return err; |
1031 | } |
1032 | |
1033 | static struct timewait_sock_ops dccp6_timewait_sock_ops = { |
1034 | .twsk_obj_size = sizeof(struct dccp6_timewait_sock), |
1035 | }; |
1036 | |
1037 | static struct proto dccp_v6_prot = { |
1038 | .name = "DCCPv6" , |
1039 | .owner = THIS_MODULE, |
1040 | .close = dccp_close, |
1041 | .connect = dccp_v6_connect, |
1042 | .disconnect = dccp_disconnect, |
1043 | .ioctl = dccp_ioctl, |
1044 | .init = dccp_v6_init_sock, |
1045 | .setsockopt = dccp_setsockopt, |
1046 | .getsockopt = dccp_getsockopt, |
1047 | .sendmsg = dccp_sendmsg, |
1048 | .recvmsg = dccp_recvmsg, |
1049 | .backlog_rcv = dccp_v6_do_rcv, |
1050 | .hash = inet6_hash, |
1051 | .unhash = inet_unhash, |
1052 | .accept = inet_csk_accept, |
1053 | .get_port = inet_csk_get_port, |
1054 | .shutdown = dccp_shutdown, |
1055 | .destroy = dccp_destroy_sock, |
1056 | .orphan_count = &dccp_orphan_count, |
1057 | .max_header = MAX_DCCP_HEADER, |
1058 | .obj_size = sizeof(struct dccp6_sock), |
1059 | .ipv6_pinfo_offset = offsetof(struct dccp6_sock, inet6), |
1060 | .slab_flags = SLAB_TYPESAFE_BY_RCU, |
1061 | .rsk_prot = &dccp6_request_sock_ops, |
1062 | .twsk_prot = &dccp6_timewait_sock_ops, |
1063 | .h.hashinfo = &dccp_hashinfo, |
1064 | }; |
1065 | |
1066 | static const struct inet6_protocol dccp_v6_protocol = { |
1067 | .handler = dccp_v6_rcv, |
1068 | .err_handler = dccp_v6_err, |
1069 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, |
1070 | }; |
1071 | |
1072 | static const struct proto_ops inet6_dccp_ops = { |
1073 | .family = PF_INET6, |
1074 | .owner = THIS_MODULE, |
1075 | .release = inet6_release, |
1076 | .bind = inet6_bind, |
1077 | .connect = inet_stream_connect, |
1078 | .socketpair = sock_no_socketpair, |
1079 | .accept = inet_accept, |
1080 | .getname = inet6_getname, |
1081 | .poll = dccp_poll, |
1082 | .ioctl = inet6_ioctl, |
1083 | .gettstamp = sock_gettstamp, |
1084 | .listen = inet_dccp_listen, |
1085 | .shutdown = inet_shutdown, |
1086 | .setsockopt = sock_common_setsockopt, |
1087 | .getsockopt = sock_common_getsockopt, |
1088 | .sendmsg = inet_sendmsg, |
1089 | .recvmsg = sock_common_recvmsg, |
1090 | .mmap = sock_no_mmap, |
1091 | #ifdef CONFIG_COMPAT |
1092 | .compat_ioctl = inet6_compat_ioctl, |
1093 | #endif |
1094 | }; |
1095 | |
1096 | static struct inet_protosw dccp_v6_protosw = { |
1097 | .type = SOCK_DCCP, |
1098 | .protocol = IPPROTO_DCCP, |
1099 | .prot = &dccp_v6_prot, |
1100 | .ops = &inet6_dccp_ops, |
1101 | .flags = INET_PROTOSW_ICSK, |
1102 | }; |
1103 | |
1104 | static int __net_init dccp_v6_init_net(struct net *net) |
1105 | { |
1106 | struct dccp_v6_pernet *pn = net_generic(net, id: dccp_v6_pernet_id); |
1107 | |
1108 | if (dccp_hashinfo.bhash == NULL) |
1109 | return -ESOCKTNOSUPPORT; |
1110 | |
1111 | return inet_ctl_sock_create(sk: &pn->v6_ctl_sk, PF_INET6, |
1112 | type: SOCK_DCCP, IPPROTO_DCCP, net); |
1113 | } |
1114 | |
1115 | static void __net_exit dccp_v6_exit_net(struct net *net) |
1116 | { |
1117 | struct dccp_v6_pernet *pn = net_generic(net, id: dccp_v6_pernet_id); |
1118 | |
1119 | inet_ctl_sock_destroy(sk: pn->v6_ctl_sk); |
1120 | } |
1121 | |
1122 | static void __net_exit dccp_v6_exit_batch(struct list_head *net_exit_list) |
1123 | { |
1124 | inet_twsk_purge(hashinfo: &dccp_hashinfo, AF_INET6); |
1125 | } |
1126 | |
1127 | static struct pernet_operations dccp_v6_ops = { |
1128 | .init = dccp_v6_init_net, |
1129 | .exit = dccp_v6_exit_net, |
1130 | .exit_batch = dccp_v6_exit_batch, |
1131 | .id = &dccp_v6_pernet_id, |
1132 | .size = sizeof(struct dccp_v6_pernet), |
1133 | }; |
1134 | |
1135 | static int __init dccp_v6_init(void) |
1136 | { |
1137 | int err = proto_register(prot: &dccp_v6_prot, alloc_slab: 1); |
1138 | |
1139 | if (err) |
1140 | goto out; |
1141 | |
1142 | inet6_register_protosw(p: &dccp_v6_protosw); |
1143 | |
1144 | err = register_pernet_subsys(&dccp_v6_ops); |
1145 | if (err) |
1146 | goto out_destroy_ctl_sock; |
1147 | |
1148 | err = inet6_add_protocol(prot: &dccp_v6_protocol, IPPROTO_DCCP); |
1149 | if (err) |
1150 | goto out_unregister_proto; |
1151 | |
1152 | out: |
1153 | return err; |
1154 | out_unregister_proto: |
1155 | unregister_pernet_subsys(&dccp_v6_ops); |
1156 | out_destroy_ctl_sock: |
1157 | inet6_unregister_protosw(p: &dccp_v6_protosw); |
1158 | proto_unregister(prot: &dccp_v6_prot); |
1159 | goto out; |
1160 | } |
1161 | |
1162 | static void __exit dccp_v6_exit(void) |
1163 | { |
1164 | inet6_del_protocol(prot: &dccp_v6_protocol, IPPROTO_DCCP); |
1165 | unregister_pernet_subsys(&dccp_v6_ops); |
1166 | inet6_unregister_protosw(p: &dccp_v6_protosw); |
1167 | proto_unregister(prot: &dccp_v6_prot); |
1168 | } |
1169 | |
1170 | module_init(dccp_v6_init); |
1171 | module_exit(dccp_v6_exit); |
1172 | |
1173 | /* |
1174 | * __stringify doesn't likes enums, so use SOCK_DCCP (6) and IPPROTO_DCCP (33) |
1175 | * values directly, Also cover the case where the protocol is not specified, |
1176 | * i.e. net-pf-PF_INET6-proto-0-type-SOCK_DCCP |
1177 | */ |
1178 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 33, 6); |
1179 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_INET6, 0, 6); |
1180 | MODULE_LICENSE("GPL" ); |
1181 | MODULE_AUTHOR("Arnaldo Carvalho de Melo <acme@mandriva.com>" ); |
1182 | MODULE_DESCRIPTION("DCCPv6 - Datagram Congestion Controlled Protocol" ); |
1183 | |