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

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