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TOMOYO Linux Cross Reference
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] = 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(1) /* INET_DIAG_SHUTDOWN */
241                 + nla_total_size(1) /* INET_DIAG_TOS */
242                 + nla_total_size(1) /* INET_DIAG_TCLASS */
243                 + nla_total_size(4) /* INET_DIAG_MARK */
244                 + nla_total_size(4) /* INET_DIAG_CLASS_ID */
245                 + nla_total_size(addrlen * asoc->peer.transport_count)
246                 + nla_total_size(addrlen * addrcnt)
247                 + nla_total_size(sizeof(struct inet_diag_meminfo))
248                 + nla_total_size(sizeof(struct inet_diag_msg))
249                 + 64;
250 }
251 
252 static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
253 {
254         struct sctp_association *assoc = tsp->asoc;
255         struct sock *sk = tsp->asoc->base.sk;
256         struct sctp_comm_param *commp = p;
257         struct sk_buff *in_skb = commp->skb;
258         const struct inet_diag_req_v2 *req = commp->r;
259         const struct nlmsghdr *nlh = commp->nlh;
260         struct net *net = sock_net(in_skb->sk);
261         struct sk_buff *rep;
262         int err;
263 
264         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
265         if (err)
266                 goto out;
267 
268         err = -ENOMEM;
269         rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
270         if (!rep)
271                 goto out;
272 
273         lock_sock(sk);
274         if (sk != assoc->base.sk) {
275                 release_sock(sk);
276                 sk = assoc->base.sk;
277                 lock_sock(sk);
278         }
279         err = inet_sctp_diag_fill(sk, assoc, rep, req,
280                                   sk_user_ns(NETLINK_CB(in_skb).sk),
281                                   NETLINK_CB(in_skb).portid,
282                                   nlh->nlmsg_seq, 0, nlh,
283                                   commp->net_admin);
284         release_sock(sk);
285         if (err < 0) {
286                 WARN_ON(err == -EMSGSIZE);
287                 kfree_skb(rep);
288                 goto out;
289         }
290 
291         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
292                               MSG_DONTWAIT);
293         if (err > 0)
294                 err = 0;
295 out:
296         return err;
297 }
298 
299 static int sctp_sock_dump(struct sctp_transport *tsp, void *p)
300 {
301         struct sctp_endpoint *ep = tsp->asoc->ep;
302         struct sctp_comm_param *commp = p;
303         struct sock *sk = ep->base.sk;
304         struct sk_buff *skb = commp->skb;
305         struct netlink_callback *cb = commp->cb;
306         const struct inet_diag_req_v2 *r = commp->r;
307         struct sctp_association *assoc;
308         int err = 0;
309 
310         lock_sock(sk);
311         list_for_each_entry(assoc, &ep->asocs, asocs) {
312                 if (cb->args[4] < cb->args[1])
313                         goto next;
314 
315                 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
316                     r->id.idiag_sport)
317                         goto next;
318                 if (r->id.idiag_dport != htons(assoc->peer.port) &&
319                     r->id.idiag_dport)
320                         goto next;
321 
322                 if (!cb->args[3] &&
323                     inet_sctp_diag_fill(sk, NULL, skb, r,
324                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
325                                         NETLINK_CB(cb->skb).portid,
326                                         cb->nlh->nlmsg_seq,
327                                         NLM_F_MULTI, cb->nlh,
328                                         commp->net_admin) < 0) {
329                         err = 1;
330                         goto release;
331                 }
332                 cb->args[3] = 1;
333 
334                 if (inet_sctp_diag_fill(sk, assoc, skb, r,
335                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
336                                         NETLINK_CB(cb->skb).portid,
337                                         cb->nlh->nlmsg_seq, 0, cb->nlh,
338                                         commp->net_admin) < 0) {
339                         err = 1;
340                         goto release;
341                 }
342 next:
343                 cb->args[4]++;
344         }
345         cb->args[1] = 0;
346         cb->args[3] = 0;
347         cb->args[4] = 0;
348 release:
349         release_sock(sk);
350         return err;
351 }
352 
353 static int sctp_sock_filter(struct sctp_transport *tsp, void *p)
354 {
355         struct sctp_endpoint *ep = tsp->asoc->ep;
356         struct sctp_comm_param *commp = p;
357         struct sock *sk = ep->base.sk;
358         const struct inet_diag_req_v2 *r = commp->r;
359         struct sctp_association *assoc =
360                 list_entry(ep->asocs.next, struct sctp_association, asocs);
361 
362         /* find the ep only once through the transports by this condition */
363         if (tsp->asoc != assoc)
364                 return 0;
365 
366         if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
367                 return 0;
368 
369         return 1;
370 }
371 
372 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
373 {
374         struct sctp_comm_param *commp = p;
375         struct sock *sk = ep->base.sk;
376         struct sk_buff *skb = commp->skb;
377         struct netlink_callback *cb = commp->cb;
378         const struct inet_diag_req_v2 *r = commp->r;
379         struct net *net = sock_net(skb->sk);
380         struct inet_sock *inet = inet_sk(sk);
381         int err = 0;
382 
383         if (!net_eq(sock_net(sk), net))
384                 goto out;
385 
386         if (cb->args[4] < cb->args[1])
387                 goto next;
388 
389         if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
390                 goto next;
391 
392         if (r->sdiag_family != AF_UNSPEC &&
393             sk->sk_family != r->sdiag_family)
394                 goto next;
395 
396         if (r->id.idiag_sport != inet->inet_sport &&
397             r->id.idiag_sport)
398                 goto next;
399 
400         if (r->id.idiag_dport != inet->inet_dport &&
401             r->id.idiag_dport)
402                 goto next;
403 
404         if (inet_sctp_diag_fill(sk, NULL, skb, r,
405                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
406                                 NETLINK_CB(cb->skb).portid,
407                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
408                                 cb->nlh, commp->net_admin) < 0) {
409                 err = 2;
410                 goto out;
411         }
412 next:
413         cb->args[4]++;
414 out:
415         return err;
416 }
417 
418 /* define the functions for sctp_diag_handler*/
419 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
420                                void *info)
421 {
422         struct sctp_infox *infox = (struct sctp_infox *)info;
423 
424         if (infox->asoc) {
425                 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
426                 r->idiag_wqueue = infox->asoc->sndbuf_used;
427         } else {
428                 r->idiag_rqueue = sk->sk_ack_backlog;
429                 r->idiag_wqueue = sk->sk_max_ack_backlog;
430         }
431         if (infox->sctpinfo)
432                 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
433 }
434 
435 static int sctp_diag_dump_one(struct sk_buff *in_skb,
436                               const struct nlmsghdr *nlh,
437                               const struct inet_diag_req_v2 *req)
438 {
439         struct net *net = sock_net(in_skb->sk);
440         union sctp_addr laddr, paddr;
441         struct sctp_comm_param commp = {
442                 .skb = in_skb,
443                 .r = req,
444                 .nlh = nlh,
445                 .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
446         };
447 
448         if (req->sdiag_family == AF_INET) {
449                 laddr.v4.sin_port = req->id.idiag_sport;
450                 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
451                 laddr.v4.sin_family = AF_INET;
452 
453                 paddr.v4.sin_port = req->id.idiag_dport;
454                 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
455                 paddr.v4.sin_family = AF_INET;
456         } else {
457                 laddr.v6.sin6_port = req->id.idiag_sport;
458                 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
459                        sizeof(laddr.v6.sin6_addr));
460                 laddr.v6.sin6_family = AF_INET6;
461 
462                 paddr.v6.sin6_port = req->id.idiag_dport;
463                 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
464                        sizeof(paddr.v6.sin6_addr));
465                 paddr.v6.sin6_family = AF_INET6;
466         }
467 
468         return sctp_transport_lookup_process(sctp_tsp_dump_one,
469                                              net, &laddr, &paddr, &commp);
470 }
471 
472 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
473                            const struct inet_diag_req_v2 *r, struct nlattr *bc)
474 {
475         u32 idiag_states = r->idiag_states;
476         struct net *net = sock_net(skb->sk);
477         struct sctp_comm_param commp = {
478                 .skb = skb,
479                 .cb = cb,
480                 .r = r,
481                 .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
482         };
483         int pos = cb->args[2];
484 
485         /* eps hashtable dumps
486          * args:
487          * 0 : if it will traversal listen sock
488          * 1 : to record the sock pos of this time's traversal
489          * 4 : to work as a temporary variable to traversal list
490          */
491         if (cb->args[0] == 0) {
492                 if (!(idiag_states & TCPF_LISTEN))
493                         goto skip;
494                 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
495                         goto done;
496 skip:
497                 cb->args[0] = 1;
498                 cb->args[1] = 0;
499                 cb->args[4] = 0;
500         }
501 
502         /* asocs by transport hashtable dump
503          * args:
504          * 1 : to record the assoc pos of this time's traversal
505          * 2 : to record the transport pos of this time's traversal
506          * 3 : to mark if we have dumped the ep info of the current asoc
507          * 4 : to work as a temporary variable to traversal list
508          * 5 : to save the sk we get from travelsing the tsp list.
509          */
510         if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
511                 goto done;
512 
513         sctp_for_each_transport(sctp_sock_filter, sctp_sock_dump,
514                                 net, &pos, &commp);
515         cb->args[2] = pos;
516 
517 done:
518         cb->args[1] = cb->args[4];
519         cb->args[4] = 0;
520 }
521 
522 static const struct inet_diag_handler sctp_diag_handler = {
523         .dump            = sctp_diag_dump,
524         .dump_one        = sctp_diag_dump_one,
525         .idiag_get_info  = sctp_diag_get_info,
526         .idiag_type      = IPPROTO_SCTP,
527         .idiag_info_size = sizeof(struct sctp_info),
528 };
529 
530 static int __init sctp_diag_init(void)
531 {
532         return inet_diag_register(&sctp_diag_handler);
533 }
534 
535 static void __exit sctp_diag_exit(void)
536 {
537         inet_diag_unregister(&sctp_diag_handler);
538 }
539 
540 module_init(sctp_diag_init);
541 module_exit(sctp_diag_exit);
542 MODULE_LICENSE("GPL");
543 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
544 

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