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Linux/net/sctp/diag.c

Version: ~ [ linux-5.12-rc7 ] ~ [ linux-5.11.13 ] ~ [ linux-5.10.29 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.111 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.186 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.230 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.266 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.266 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 /* SCTP kernel implementation
  2  * (C) Copyright Red Hat Inc. 2017
  3  *
  4  * This file is part of the SCTP kernel implementation
  5  *
  6  * These functions implement sctp diag support.
  7  *
  8  * This SCTP implementation is free software;
  9  * you can redistribute it and/or modify it under the terms of
 10  * the GNU General Public License as published by
 11  * the Free Software Foundation; either version 2, or (at your option)
 12  * any later version.
 13  *
 14  * This SCTP implementation is distributed in the hope that it
 15  * will be useful, but WITHOUT ANY WARRANTY; without even the implied
 16  *                 ************************
 17  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 18  * See the GNU General Public License for more details.
 19  *
 20  * You should have received a copy of the GNU General Public License
 21  * along with GNU CC; see the file COPYING.  If not, see
 22  * <http://www.gnu.org/licenses/>.
 23  *
 24  * Please send any bug reports or fixes you make to the
 25  * email addresched(es):
 26  *    lksctp developers <linux-sctp@vger.kernel.org>
 27  *
 28  * Written or modified by:
 29  *    Xin Long <lucien.xin@gmail.com>
 30  */
 31 
 32 #include <linux/module.h>
 33 #include <linux/inet_diag.h>
 34 #include <linux/sock_diag.h>
 35 #include <net/sctp/sctp.h>
 36 
 37 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 38                                void *info);
 39 
 40 /* define some functions to make asoc/ep fill look clean */
 41 static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
 42                                         struct sock *sk,
 43                                         struct sctp_association *asoc)
 44 {
 45         union sctp_addr laddr, paddr;
 46         struct dst_entry *dst;
 47         struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
 48 
 49         laddr = list_entry(asoc->base.bind_addr.address_list.next,
 50                            struct sctp_sockaddr_entry, list)->a;
 51         paddr = asoc->peer.primary_path->ipaddr;
 52         dst = asoc->peer.primary_path->dst;
 53 
 54         r->idiag_family = sk->sk_family;
 55         r->id.idiag_sport = htons(asoc->base.bind_addr.port);
 56         r->id.idiag_dport = htons(asoc->peer.port);
 57         r->id.idiag_if = dst ? dst->dev->ifindex : 0;
 58         sock_diag_save_cookie(sk, r->id.idiag_cookie);
 59 
 60 #if IS_ENABLED(CONFIG_IPV6)
 61         if (sk->sk_family == AF_INET6) {
 62                 *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
 63                 *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
 64         } else
 65 #endif
 66         {
 67                 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 68                 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 69 
 70                 r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
 71                 r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
 72         }
 73 
 74         r->idiag_state = asoc->state;
 75         if (timer_pending(t3_rtx)) {
 76                 r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
 77                 r->idiag_retrans = asoc->rtx_data_chunks;
 78                 r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
 79         } else {
 80                 r->idiag_timer = 0;
 81                 r->idiag_retrans = 0;
 82                 r->idiag_expires = 0;
 83         }
 84 }
 85 
 86 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
 87                                          struct list_head *address_list)
 88 {
 89         struct sctp_sockaddr_entry *laddr;
 90         int addrlen = sizeof(struct sockaddr_storage);
 91         int addrcnt = 0;
 92         struct nlattr *attr;
 93         void *info = NULL;
 94 
 95         list_for_each_entry_rcu(laddr, address_list, list)
 96                 addrcnt++;
 97 
 98         attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
 99         if (!attr)
100                 return -EMSGSIZE;
101 
102         info = nla_data(attr);
103         list_for_each_entry_rcu(laddr, address_list, list) {
104                 memcpy(info, &laddr->a, sizeof(laddr->a));
105                 memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
106                 info += addrlen;
107         }
108 
109         return 0;
110 }
111 
112 static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
113                                         struct sctp_association *asoc)
114 {
115         int addrlen = sizeof(struct sockaddr_storage);
116         struct sctp_transport *from;
117         struct nlattr *attr;
118         void *info = NULL;
119 
120         attr = nla_reserve(skb, INET_DIAG_PEERS,
121                            addrlen * asoc->peer.transport_count);
122         if (!attr)
123                 return -EMSGSIZE;
124 
125         info = nla_data(attr);
126         list_for_each_entry(from, &asoc->peer.transport_addr_list,
127                             transports) {
128                 memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
129                 memset(info + sizeof(from->ipaddr), 0,
130                        addrlen - sizeof(from->ipaddr));
131                 info += addrlen;
132         }
133 
134         return 0;
135 }
136 
137 /* sctp asoc/ep fill*/
138 static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
139                                struct sk_buff *skb,
140                                const struct inet_diag_req_v2 *req,
141                                struct user_namespace *user_ns,
142                                int portid, u32 seq, u16 nlmsg_flags,
143                                const struct nlmsghdr *unlh,
144                                bool net_admin)
145 {
146         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
147         struct list_head *addr_list;
148         struct inet_diag_msg *r;
149         struct nlmsghdr  *nlh;
150         int ext = req->idiag_ext;
151         struct sctp_infox infox;
152         void *info = NULL;
153 
154         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
155                         nlmsg_flags);
156         if (!nlh)
157                 return -EMSGSIZE;
158 
159         r = nlmsg_data(nlh);
160         BUG_ON(!sk_fullsock(sk));
161 
162         if (asoc) {
163                 inet_diag_msg_sctpasoc_fill(r, sk, asoc);
164         } else {
165                 inet_diag_msg_common_fill(r, sk);
166                 r->idiag_state = sk->sk_state;
167                 r->idiag_timer = 0;
168                 r->idiag_retrans = 0;
169         }
170 
171         if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
172                 goto errout;
173 
174         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
175                 u32 mem[SK_MEMINFO_VARS];
176                 int amt;
177 
178                 if (asoc && asoc->ep->sndbuf_policy)
179                         amt = asoc->sndbuf_used;
180                 else
181                         amt = sk_wmem_alloc_get(sk);
182                 mem[SK_MEMINFO_WMEM_ALLOC] = amt;
183                 if (asoc && asoc->ep->rcvbuf_policy)
184                         amt = atomic_read(&asoc->rmem_alloc);
185                 else
186                         amt = sk_rmem_alloc_get(sk);
187                 mem[SK_MEMINFO_RMEM_ALLOC] = amt;
188                 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
189                 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
190                 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
191                 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
192                 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
193                 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
194                 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
195 
196                 if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
197                         goto errout;
198         }
199 
200         if (ext & (1 << (INET_DIAG_INFO - 1))) {
201                 struct nlattr *attr;
202 
203                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
204                                          sizeof(struct sctp_info),
205                                          INET_DIAG_PAD);
206                 if (!attr)
207                         goto errout;
208 
209                 info = nla_data(attr);
210         }
211         infox.sctpinfo = (struct sctp_info *)info;
212         infox.asoc = asoc;
213         sctp_diag_get_info(sk, r, &infox);
214 
215         addr_list = asoc ? &asoc->base.bind_addr.address_list
216                          : &ep->base.bind_addr.address_list;
217         if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
218                 goto errout;
219 
220         if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
221                 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
222                         goto errout;
223 
224         if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
225                 goto errout;
226 
227         nlmsg_end(skb, nlh);
228         return 0;
229 
230 errout:
231         nlmsg_cancel(skb, nlh);
232         return -EMSGSIZE;
233 }
234 
235 /* callback and param */
236 struct sctp_comm_param {
237         struct sk_buff *skb;
238         struct netlink_callback *cb;
239         const struct inet_diag_req_v2 *r;
240         const struct nlmsghdr *nlh;
241         bool net_admin;
242 };
243 
244 static size_t inet_assoc_attr_size(struct sctp_association *asoc)
245 {
246         int addrlen = sizeof(struct sockaddr_storage);
247         int addrcnt = 0;
248         struct sctp_sockaddr_entry *laddr;
249 
250         list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
251                                 list)
252                 addrcnt++;
253 
254         return    nla_total_size(sizeof(struct sctp_info))
255                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
256                 + nla_total_size(1) /* INET_DIAG_TOS */
257                 + nla_total_size(1) /* INET_DIAG_TCLASS */
258                 + nla_total_size(4) /* INET_DIAG_MARK */
259                 + nla_total_size(addrlen * asoc->peer.transport_count)
260                 + nla_total_size(addrlen * addrcnt)
261                 + nla_total_size(sizeof(struct inet_diag_meminfo))
262                 + nla_total_size(sizeof(struct inet_diag_msg))
263                 + 64;
264 }
265 
266 static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
267 {
268         struct sctp_association *assoc = tsp->asoc;
269         struct sock *sk = tsp->asoc->base.sk;
270         struct sctp_comm_param *commp = p;
271         struct sk_buff *in_skb = commp->skb;
272         const struct inet_diag_req_v2 *req = commp->r;
273         const struct nlmsghdr *nlh = commp->nlh;
274         struct net *net = sock_net(in_skb->sk);
275         struct sk_buff *rep;
276         int err;
277 
278         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
279         if (err)
280                 goto out;
281 
282         err = -ENOMEM;
283         rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
284         if (!rep)
285                 goto out;
286 
287         lock_sock(sk);
288         if (sk != assoc->base.sk) {
289                 release_sock(sk);
290                 sk = assoc->base.sk;
291                 lock_sock(sk);
292         }
293         err = inet_sctp_diag_fill(sk, assoc, rep, req,
294                                   sk_user_ns(NETLINK_CB(in_skb).sk),
295                                   NETLINK_CB(in_skb).portid,
296                                   nlh->nlmsg_seq, 0, nlh,
297                                   commp->net_admin);
298         release_sock(sk);
299         if (err < 0) {
300                 WARN_ON(err == -EMSGSIZE);
301                 kfree_skb(rep);
302                 goto out;
303         }
304 
305         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
306                               MSG_DONTWAIT);
307         if (err > 0)
308                 err = 0;
309 out:
310         return err;
311 }
312 
313 static int sctp_sock_dump(struct sctp_transport *tsp, void *p)
314 {
315         struct sctp_endpoint *ep = tsp->asoc->ep;
316         struct sctp_comm_param *commp = p;
317         struct sock *sk = ep->base.sk;
318         struct sk_buff *skb = commp->skb;
319         struct netlink_callback *cb = commp->cb;
320         const struct inet_diag_req_v2 *r = commp->r;
321         struct sctp_association *assoc;
322         int err = 0;
323 
324         lock_sock(sk);
325         list_for_each_entry(assoc, &ep->asocs, asocs) {
326                 if (cb->args[4] < cb->args[1])
327                         goto next;
328 
329                 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
330                     r->id.idiag_sport)
331                         goto next;
332                 if (r->id.idiag_dport != htons(assoc->peer.port) &&
333                     r->id.idiag_dport)
334                         goto next;
335 
336                 if (!cb->args[3] &&
337                     inet_sctp_diag_fill(sk, NULL, skb, r,
338                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
339                                         NETLINK_CB(cb->skb).portid,
340                                         cb->nlh->nlmsg_seq,
341                                         NLM_F_MULTI, cb->nlh,
342                                         commp->net_admin) < 0) {
343                         err = 1;
344                         goto release;
345                 }
346                 cb->args[3] = 1;
347 
348                 if (inet_sctp_diag_fill(sk, assoc, skb, r,
349                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
350                                         NETLINK_CB(cb->skb).portid,
351                                         cb->nlh->nlmsg_seq, 0, cb->nlh,
352                                         commp->net_admin) < 0) {
353                         err = 1;
354                         goto release;
355                 }
356 next:
357                 cb->args[4]++;
358         }
359         cb->args[1] = 0;
360         cb->args[3] = 0;
361         cb->args[4] = 0;
362 release:
363         release_sock(sk);
364         return err;
365 }
366 
367 static int sctp_sock_filter(struct sctp_transport *tsp, void *p)
368 {
369         struct sctp_endpoint *ep = tsp->asoc->ep;
370         struct sctp_comm_param *commp = p;
371         struct sock *sk = ep->base.sk;
372         const struct inet_diag_req_v2 *r = commp->r;
373         struct sctp_association *assoc =
374                 list_entry(ep->asocs.next, struct sctp_association, asocs);
375 
376         /* find the ep only once through the transports by this condition */
377         if (tsp->asoc != assoc)
378                 return 0;
379 
380         if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
381                 return 0;
382 
383         return 1;
384 }
385 
386 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
387 {
388         struct sctp_comm_param *commp = p;
389         struct sock *sk = ep->base.sk;
390         struct sk_buff *skb = commp->skb;
391         struct netlink_callback *cb = commp->cb;
392         const struct inet_diag_req_v2 *r = commp->r;
393         struct net *net = sock_net(skb->sk);
394         struct inet_sock *inet = inet_sk(sk);
395         int err = 0;
396 
397         if (!net_eq(sock_net(sk), net))
398                 goto out;
399 
400         if (cb->args[4] < cb->args[1])
401                 goto next;
402 
403         if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
404                 goto next;
405 
406         if (r->sdiag_family != AF_UNSPEC &&
407             sk->sk_family != r->sdiag_family)
408                 goto next;
409 
410         if (r->id.idiag_sport != inet->inet_sport &&
411             r->id.idiag_sport)
412                 goto next;
413 
414         if (r->id.idiag_dport != inet->inet_dport &&
415             r->id.idiag_dport)
416                 goto next;
417 
418         if (inet_sctp_diag_fill(sk, NULL, skb, r,
419                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
420                                 NETLINK_CB(cb->skb).portid,
421                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
422                                 cb->nlh, commp->net_admin) < 0) {
423                 err = 2;
424                 goto out;
425         }
426 next:
427         cb->args[4]++;
428 out:
429         return err;
430 }
431 
432 /* define the functions for sctp_diag_handler*/
433 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
434                                void *info)
435 {
436         struct sctp_infox *infox = (struct sctp_infox *)info;
437 
438         if (infox->asoc) {
439                 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
440                 r->idiag_wqueue = infox->asoc->sndbuf_used;
441         } else {
442                 r->idiag_rqueue = sk->sk_ack_backlog;
443                 r->idiag_wqueue = sk->sk_max_ack_backlog;
444         }
445         if (infox->sctpinfo)
446                 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
447 }
448 
449 static int sctp_diag_dump_one(struct sk_buff *in_skb,
450                               const struct nlmsghdr *nlh,
451                               const struct inet_diag_req_v2 *req)
452 {
453         struct net *net = sock_net(in_skb->sk);
454         union sctp_addr laddr, paddr;
455         struct sctp_comm_param commp = {
456                 .skb = in_skb,
457                 .r = req,
458                 .nlh = nlh,
459                 .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
460         };
461 
462         if (req->sdiag_family == AF_INET) {
463                 laddr.v4.sin_port = req->id.idiag_sport;
464                 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
465                 laddr.v4.sin_family = AF_INET;
466 
467                 paddr.v4.sin_port = req->id.idiag_dport;
468                 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
469                 paddr.v4.sin_family = AF_INET;
470         } else {
471                 laddr.v6.sin6_port = req->id.idiag_sport;
472                 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
473                        sizeof(laddr.v6.sin6_addr));
474                 laddr.v6.sin6_family = AF_INET6;
475 
476                 paddr.v6.sin6_port = req->id.idiag_dport;
477                 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
478                        sizeof(paddr.v6.sin6_addr));
479                 paddr.v6.sin6_family = AF_INET6;
480         }
481 
482         return sctp_transport_lookup_process(sctp_tsp_dump_one,
483                                              net, &laddr, &paddr, &commp);
484 }
485 
486 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
487                            const struct inet_diag_req_v2 *r, struct nlattr *bc)
488 {
489         u32 idiag_states = r->idiag_states;
490         struct net *net = sock_net(skb->sk);
491         struct sctp_comm_param commp = {
492                 .skb = skb,
493                 .cb = cb,
494                 .r = r,
495                 .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
496         };
497         int pos = cb->args[2];
498 
499         /* eps hashtable dumps
500          * args:
501          * 0 : if it will traversal listen sock
502          * 1 : to record the sock pos of this time's traversal
503          * 4 : to work as a temporary variable to traversal list
504          */
505         if (cb->args[0] == 0) {
506                 if (!(idiag_states & TCPF_LISTEN))
507                         goto skip;
508                 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
509                         goto done;
510 skip:
511                 cb->args[0] = 1;
512                 cb->args[1] = 0;
513                 cb->args[4] = 0;
514         }
515 
516         /* asocs by transport hashtable dump
517          * args:
518          * 1 : to record the assoc pos of this time's traversal
519          * 2 : to record the transport pos of this time's traversal
520          * 3 : to mark if we have dumped the ep info of the current asoc
521          * 4 : to work as a temporary variable to traversal list
522          * 5 : to save the sk we get from travelsing the tsp list.
523          */
524         if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
525                 goto done;
526 
527         sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
528                                 net, &pos, &commp);
529         cb->args[2] = pos;
530 
531 done:
532         cb->args[1] = cb->args[4];
533         cb->args[4] = 0;
534 }
535 
536 static const struct inet_diag_handler sctp_diag_handler = {
537         .dump            = sctp_diag_dump,
538         .dump_one        = sctp_diag_dump_one,
539         .idiag_get_info  = sctp_diag_get_info,
540         .idiag_type      = IPPROTO_SCTP,
541         .idiag_info_size = sizeof(struct sctp_info),
542 };
543 
544 static int __init sctp_diag_init(void)
545 {
546         return inet_diag_register(&sctp_diag_handler);
547 }
548 
549 static void __exit sctp_diag_exit(void)
550 {
551         inet_diag_unregister(&sctp_diag_handler);
552 }
553 
554 module_init(sctp_diag_init);
555 module_exit(sctp_diag_exit);
556 MODULE_LICENSE("GPL");
557 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
558 

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