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Linux/net/sctp/diag.c

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /* SCTP kernel implementation
  3  * (C) Copyright Red Hat Inc. 2017
  4  *
  5  * This file is part of the SCTP kernel implementation
  6  *
  7  * These functions implement sctp diag support.
  8  *
  9  * Please send any bug reports or fixes you make to the
 10  * email addresched(es):
 11  *    lksctp developers <linux-sctp@vger.kernel.org>
 12  *
 13  * Written or modified by:
 14  *    Xin Long <lucien.xin@gmail.com>
 15  */
 16 
 17 #include <linux/module.h>
 18 #include <linux/inet_diag.h>
 19 #include <linux/sock_diag.h>
 20 #include <net/sctp/sctp.h>
 21 
 22 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 23                                void *info);
 24 
 25 /* define some functions to make asoc/ep fill look clean */
 26 static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
 27                                         struct sock *sk,
 28                                         struct sctp_association *asoc)
 29 {
 30         union sctp_addr laddr, paddr;
 31         struct dst_entry *dst;
 32         struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
 33 
 34         laddr = list_entry(asoc->base.bind_addr.address_list.next,
 35                            struct sctp_sockaddr_entry, list)->a;
 36         paddr = asoc->peer.primary_path->ipaddr;
 37         dst = asoc->peer.primary_path->dst;
 38 
 39         r->idiag_family = sk->sk_family;
 40         r->id.idiag_sport = htons(asoc->base.bind_addr.port);
 41         r->id.idiag_dport = htons(asoc->peer.port);
 42         r->id.idiag_if = dst ? dst->dev->ifindex : 0;
 43         sock_diag_save_cookie(sk, r->id.idiag_cookie);
 44 
 45 #if IS_ENABLED(CONFIG_IPV6)
 46         if (sk->sk_family == AF_INET6) {
 47                 *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
 48                 *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
 49         } else
 50 #endif
 51         {
 52                 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
 53                 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
 54 
 55                 r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
 56                 r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
 57         }
 58 
 59         r->idiag_state = asoc->state;
 60         if (timer_pending(t3_rtx)) {
 61                 r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
 62                 r->idiag_retrans = asoc->rtx_data_chunks;
 63                 r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
 64         } else {
 65                 r->idiag_timer = 0;
 66                 r->idiag_retrans = 0;
 67                 r->idiag_expires = 0;
 68         }
 69 }
 70 
 71 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
 72                                          struct list_head *address_list)
 73 {
 74         struct sctp_sockaddr_entry *laddr;
 75         int addrlen = sizeof(struct sockaddr_storage);
 76         int addrcnt = 0;
 77         struct nlattr *attr;
 78         void *info = NULL;
 79 
 80         list_for_each_entry_rcu(laddr, address_list, list)
 81                 addrcnt++;
 82 
 83         attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
 84         if (!attr)
 85                 return -EMSGSIZE;
 86 
 87         info = nla_data(attr);
 88         list_for_each_entry_rcu(laddr, address_list, list) {
 89                 memcpy(info, &laddr->a, sizeof(laddr->a));
 90                 memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
 91                 info += addrlen;
 92         }
 93 
 94         return 0;
 95 }
 96 
 97 static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
 98                                         struct sctp_association *asoc)
 99 {
100         int addrlen = sizeof(struct sockaddr_storage);
101         struct sctp_transport *from;
102         struct nlattr *attr;
103         void *info = NULL;
104 
105         attr = nla_reserve(skb, INET_DIAG_PEERS,
106                            addrlen * asoc->peer.transport_count);
107         if (!attr)
108                 return -EMSGSIZE;
109 
110         info = nla_data(attr);
111         list_for_each_entry(from, &asoc->peer.transport_addr_list,
112                             transports) {
113                 memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
114                 memset(info + sizeof(from->ipaddr), 0,
115                        addrlen - sizeof(from->ipaddr));
116                 info += addrlen;
117         }
118 
119         return 0;
120 }
121 
122 /* sctp asoc/ep fill*/
123 static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
124                                struct sk_buff *skb,
125                                const struct inet_diag_req_v2 *req,
126                                struct user_namespace *user_ns,
127                                int portid, u32 seq, u16 nlmsg_flags,
128                                const struct nlmsghdr *unlh,
129                                bool net_admin)
130 {
131         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
132         struct list_head *addr_list;
133         struct inet_diag_msg *r;
134         struct nlmsghdr  *nlh;
135         int ext = req->idiag_ext;
136         struct sctp_infox infox;
137         void *info = NULL;
138 
139         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
140                         nlmsg_flags);
141         if (!nlh)
142                 return -EMSGSIZE;
143 
144         r = nlmsg_data(nlh);
145         BUG_ON(!sk_fullsock(sk));
146 
147         if (asoc) {
148                 inet_diag_msg_sctpasoc_fill(r, sk, asoc);
149         } else {
150                 inet_diag_msg_common_fill(r, sk);
151                 r->idiag_state = sk->sk_state;
152                 r->idiag_timer = 0;
153                 r->idiag_retrans = 0;
154         }
155 
156         if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
157                 goto errout;
158 
159         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
160                 u32 mem[SK_MEMINFO_VARS];
161                 int amt;
162 
163                 if (asoc && asoc->ep->sndbuf_policy)
164                         amt = asoc->sndbuf_used;
165                 else
166                         amt = sk_wmem_alloc_get(sk);
167                 mem[SK_MEMINFO_WMEM_ALLOC] = amt;
168                 if (asoc && asoc->ep->rcvbuf_policy)
169                         amt = atomic_read(&asoc->rmem_alloc);
170                 else
171                         amt = sk_rmem_alloc_get(sk);
172                 mem[SK_MEMINFO_RMEM_ALLOC] = amt;
173                 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
174                 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
175                 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
176                 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
177                 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
178                 mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
179                 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
180 
181                 if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
182                         goto errout;
183         }
184 
185         if (ext & (1 << (INET_DIAG_INFO - 1))) {
186                 struct nlattr *attr;
187 
188                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
189                                          sizeof(struct sctp_info),
190                                          INET_DIAG_PAD);
191                 if (!attr)
192                         goto errout;
193 
194                 info = nla_data(attr);
195         }
196         infox.sctpinfo = (struct sctp_info *)info;
197         infox.asoc = asoc;
198         sctp_diag_get_info(sk, r, &infox);
199 
200         addr_list = asoc ? &asoc->base.bind_addr.address_list
201                          : &ep->base.bind_addr.address_list;
202         if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
203                 goto errout;
204 
205         if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
206                 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
207                         goto errout;
208 
209         if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
210                 goto errout;
211 
212         nlmsg_end(skb, nlh);
213         return 0;
214 
215 errout:
216         nlmsg_cancel(skb, nlh);
217         return -EMSGSIZE;
218 }
219 
220 /* callback and param */
221 struct sctp_comm_param {
222         struct sk_buff *skb;
223         struct netlink_callback *cb;
224         const struct inet_diag_req_v2 *r;
225         const struct nlmsghdr *nlh;
226         bool net_admin;
227 };
228 
229 static size_t inet_assoc_attr_size(struct sctp_association *asoc)
230 {
231         int addrlen = sizeof(struct sockaddr_storage);
232         int addrcnt = 0;
233         struct sctp_sockaddr_entry *laddr;
234 
235         list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
236                                 list)
237                 addrcnt++;
238 
239         return    nla_total_size(sizeof(struct sctp_info))
240                 + nla_total_size(addrlen * asoc->peer.transport_count)
241                 + nla_total_size(addrlen * addrcnt)
242                 + nla_total_size(sizeof(struct inet_diag_msg))
243                 + inet_diag_msg_attrs_size()
244                 + nla_total_size(sizeof(struct inet_diag_meminfo))
245                 + 64;
246 }
247 
248 static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
249 {
250         struct sctp_association *assoc = tsp->asoc;
251         struct sock *sk = tsp->asoc->base.sk;
252         struct sctp_comm_param *commp = p;
253         struct sk_buff *in_skb = commp->skb;
254         const struct inet_diag_req_v2 *req = commp->r;
255         const struct nlmsghdr *nlh = commp->nlh;
256         struct net *net = sock_net(in_skb->sk);
257         struct sk_buff *rep;
258         int err;
259 
260         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
261         if (err)
262                 goto out;
263 
264         err = -ENOMEM;
265         rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
266         if (!rep)
267                 goto out;
268 
269         lock_sock(sk);
270         if (sk != assoc->base.sk) {
271                 release_sock(sk);
272                 sk = assoc->base.sk;
273                 lock_sock(sk);
274         }
275         err = inet_sctp_diag_fill(sk, assoc, rep, req,
276                                   sk_user_ns(NETLINK_CB(in_skb).sk),
277                                   NETLINK_CB(in_skb).portid,
278                                   nlh->nlmsg_seq, 0, nlh,
279                                   commp->net_admin);
280         release_sock(sk);
281         if (err < 0) {
282                 WARN_ON(err == -EMSGSIZE);
283                 kfree_skb(rep);
284                 goto out;
285         }
286 
287         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
288                               MSG_DONTWAIT);
289         if (err > 0)
290                 err = 0;
291 out:
292         return err;
293 }
294 
295 static int sctp_sock_dump(struct sctp_transport *tsp, void *p)
296 {
297         struct sctp_endpoint *ep = tsp->asoc->ep;
298         struct sctp_comm_param *commp = p;
299         struct sock *sk = ep->base.sk;
300         struct sk_buff *skb = commp->skb;
301         struct netlink_callback *cb = commp->cb;
302         const struct inet_diag_req_v2 *r = commp->r;
303         struct sctp_association *assoc;
304         int err = 0;
305 
306         lock_sock(sk);
307         list_for_each_entry(assoc, &ep->asocs, asocs) {
308                 if (cb->args[4] < cb->args[1])
309                         goto next;
310 
311                 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
312                     r->id.idiag_sport)
313                         goto next;
314                 if (r->id.idiag_dport != htons(assoc->peer.port) &&
315                     r->id.idiag_dport)
316                         goto next;
317 
318                 if (!cb->args[3] &&
319                     inet_sctp_diag_fill(sk, NULL, skb, r,
320                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
321                                         NETLINK_CB(cb->skb).portid,
322                                         cb->nlh->nlmsg_seq,
323                                         NLM_F_MULTI, cb->nlh,
324                                         commp->net_admin) < 0) {
325                         err = 1;
326                         goto release;
327                 }
328                 cb->args[3] = 1;
329 
330                 if (inet_sctp_diag_fill(sk, assoc, skb, r,
331                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
332                                         NETLINK_CB(cb->skb).portid,
333                                         cb->nlh->nlmsg_seq, 0, cb->nlh,
334                                         commp->net_admin) < 0) {
335                         err = 1;
336                         goto release;
337                 }
338 next:
339                 cb->args[4]++;
340         }
341         cb->args[1] = 0;
342         cb->args[3] = 0;
343         cb->args[4] = 0;
344 release:
345         release_sock(sk);
346         return err;
347 }
348 
349 static int sctp_sock_filter(struct sctp_transport *tsp, void *p)
350 {
351         struct sctp_endpoint *ep = tsp->asoc->ep;
352         struct sctp_comm_param *commp = p;
353         struct sock *sk = ep->base.sk;
354         const struct inet_diag_req_v2 *r = commp->r;
355         struct sctp_association *assoc =
356                 list_entry(ep->asocs.next, struct sctp_association, asocs);
357 
358         /* find the ep only once through the transports by this condition */
359         if (tsp->asoc != assoc)
360                 return 0;
361 
362         if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
363                 return 0;
364 
365         return 1;
366 }
367 
368 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
369 {
370         struct sctp_comm_param *commp = p;
371         struct sock *sk = ep->base.sk;
372         struct sk_buff *skb = commp->skb;
373         struct netlink_callback *cb = commp->cb;
374         const struct inet_diag_req_v2 *r = commp->r;
375         struct net *net = sock_net(skb->sk);
376         struct inet_sock *inet = inet_sk(sk);
377         int err = 0;
378 
379         if (!net_eq(sock_net(sk), net))
380                 goto out;
381 
382         if (cb->args[4] < cb->args[1])
383                 goto next;
384 
385         if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
386                 goto next;
387 
388         if (r->sdiag_family != AF_UNSPEC &&
389             sk->sk_family != r->sdiag_family)
390                 goto next;
391 
392         if (r->id.idiag_sport != inet->inet_sport &&
393             r->id.idiag_sport)
394                 goto next;
395 
396         if (r->id.idiag_dport != inet->inet_dport &&
397             r->id.idiag_dport)
398                 goto next;
399 
400         if (inet_sctp_diag_fill(sk, NULL, skb, r,
401                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
402                                 NETLINK_CB(cb->skb).portid,
403                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
404                                 cb->nlh, commp->net_admin) < 0) {
405                 err = 2;
406                 goto out;
407         }
408 next:
409         cb->args[4]++;
410 out:
411         return err;
412 }
413 
414 /* define the functions for sctp_diag_handler*/
415 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
416                                void *info)
417 {
418         struct sctp_infox *infox = (struct sctp_infox *)info;
419 
420         if (infox->asoc) {
421                 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
422                 r->idiag_wqueue = infox->asoc->sndbuf_used;
423         } else {
424                 r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
425                 r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog);
426         }
427         if (infox->sctpinfo)
428                 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
429 }
430 
431 static int sctp_diag_dump_one(struct sk_buff *in_skb,
432                               const struct nlmsghdr *nlh,
433                               const struct inet_diag_req_v2 *req)
434 {
435         struct net *net = sock_net(in_skb->sk);
436         union sctp_addr laddr, paddr;
437         struct sctp_comm_param commp = {
438                 .skb = in_skb,
439                 .r = req,
440                 .nlh = nlh,
441                 .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
442         };
443 
444         if (req->sdiag_family == AF_INET) {
445                 laddr.v4.sin_port = req->id.idiag_sport;
446                 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
447                 laddr.v4.sin_family = AF_INET;
448 
449                 paddr.v4.sin_port = req->id.idiag_dport;
450                 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
451                 paddr.v4.sin_family = AF_INET;
452         } else {
453                 laddr.v6.sin6_port = req->id.idiag_sport;
454                 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
455                        sizeof(laddr.v6.sin6_addr));
456                 laddr.v6.sin6_family = AF_INET6;
457 
458                 paddr.v6.sin6_port = req->id.idiag_dport;
459                 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
460                        sizeof(paddr.v6.sin6_addr));
461                 paddr.v6.sin6_family = AF_INET6;
462         }
463 
464         return sctp_transport_lookup_process(sctp_tsp_dump_one,
465                                              net, &laddr, &paddr, &commp);
466 }
467 
468 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
469                            const struct inet_diag_req_v2 *r, struct nlattr *bc)
470 {
471         u32 idiag_states = r->idiag_states;
472         struct net *net = sock_net(skb->sk);
473         struct sctp_comm_param commp = {
474                 .skb = skb,
475                 .cb = cb,
476                 .r = r,
477                 .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
478         };
479         int pos = cb->args[2];
480 
481         /* eps hashtable dumps
482          * args:
483          * 0 : if it will traversal listen sock
484          * 1 : to record the sock pos of this time's traversal
485          * 4 : to work as a temporary variable to traversal list
486          */
487         if (cb->args[0] == 0) {
488                 if (!(idiag_states & TCPF_LISTEN))
489                         goto skip;
490                 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
491                         goto done;
492 skip:
493                 cb->args[0] = 1;
494                 cb->args[1] = 0;
495                 cb->args[4] = 0;
496         }
497 
498         /* asocs by transport hashtable dump
499          * args:
500          * 1 : to record the assoc pos of this time's traversal
501          * 2 : to record the transport pos of this time's traversal
502          * 3 : to mark if we have dumped the ep info of the current asoc
503          * 4 : to work as a temporary variable to traversal list
504          * 5 : to save the sk we get from travelsing the tsp list.
505          */
506         if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
507                 goto done;
508 
509         sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
510                                 net, &pos, &commp);
511         cb->args[2] = pos;
512 
513 done:
514         cb->args[1] = cb->args[4];
515         cb->args[4] = 0;
516 }
517 
518 static const struct inet_diag_handler sctp_diag_handler = {
519         .dump            = sctp_diag_dump,
520         .dump_one        = sctp_diag_dump_one,
521         .idiag_get_info  = sctp_diag_get_info,
522         .idiag_type      = IPPROTO_SCTP,
523         .idiag_info_size = sizeof(struct sctp_info),
524 };
525 
526 static int __init sctp_diag_init(void)
527 {
528         return inet_diag_register(&sctp_diag_handler);
529 }
530 
531 static void __exit sctp_diag_exit(void)
532 {
533         inet_diag_unregister(&sctp_diag_handler);
534 }
535 
536 module_init(sctp_diag_init);
537 module_exit(sctp_diag_exit);
538 MODULE_LICENSE("GPL");
539 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
540 

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