1 /* SCTP kernel implementation
2 * (C) Copyright Red Hat Inc. 2017
4 * This file is part of the SCTP kernel implementation
6 * These functions implement sctp diag support.
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)
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.
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/>.
24 * Please send any bug reports or fixes you make to the
25 * email addresched(es):
26 * lksctp developers <linux-sctp@vger.kernel.org>
28 * Written or modified by:
29 * Xin Long <lucien.xin@gmail.com>
32 #include <linux/module.h>
33 #include <linux/inet_diag.h>
34 #include <linux/sock_diag.h>
35 #include <net/sctp/sctp.h>
37 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
40 /* define some functions to make asoc/ep fill look clean */
41 static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
43 struct sctp_association *asoc)
45 union sctp_addr laddr, paddr;
46 struct dst_entry *dst;
47 struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
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;
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);
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;
67 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
68 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
70 r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
71 r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
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);
82 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
83 struct list_head *address_list)
85 struct sctp_sockaddr_entry *laddr;
86 int addrlen = sizeof(struct sockaddr_storage);
91 list_for_each_entry_rcu(laddr, address_list, list)
94 attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
98 info = nla_data(attr);
99 list_for_each_entry_rcu(laddr, address_list, list) {
100 memcpy(info, &laddr->a, sizeof(laddr->a));
101 memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
108 static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
109 struct sctp_association *asoc)
111 int addrlen = sizeof(struct sockaddr_storage);
112 struct sctp_transport *from;
116 attr = nla_reserve(skb, INET_DIAG_PEERS,
117 addrlen * asoc->peer.transport_count);
121 info = nla_data(attr);
122 list_for_each_entry(from, &asoc->peer.transport_addr_list,
124 memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
125 memset(info + sizeof(from->ipaddr), 0,
126 addrlen - sizeof(from->ipaddr));
133 /* sctp asoc/ep fill*/
134 static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
136 const struct inet_diag_req_v2 *req,
137 struct user_namespace *user_ns,
138 int portid, u32 seq, u16 nlmsg_flags,
139 const struct nlmsghdr *unlh,
142 struct sctp_endpoint *ep = sctp_sk(sk)->ep;
143 struct list_head *addr_list;
144 struct inet_diag_msg *r;
145 struct nlmsghdr *nlh;
146 int ext = req->idiag_ext;
147 struct sctp_infox infox;
150 nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
156 BUG_ON(!sk_fullsock(sk));
159 r->idiag_retrans = 0;
160 r->idiag_expires = 0;
162 inet_diag_msg_sctpasoc_fill(r, sk, asoc);
164 inet_diag_msg_common_fill(r, sk);
165 r->idiag_state = sk->sk_state;
168 if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
171 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
172 u32 mem[SK_MEMINFO_VARS];
175 if (asoc && asoc->ep->sndbuf_policy)
176 amt = asoc->sndbuf_used;
178 amt = sk_wmem_alloc_get(sk);
179 mem[SK_MEMINFO_WMEM_ALLOC] = amt;
180 if (asoc && asoc->ep->rcvbuf_policy)
181 amt = atomic_read(&asoc->rmem_alloc);
183 amt = sk_rmem_alloc_get(sk);
184 mem[SK_MEMINFO_RMEM_ALLOC] = amt;
185 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
186 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
187 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
188 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
189 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
190 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
191 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
193 if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
197 if (ext & (1 << (INET_DIAG_INFO - 1))) {
200 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
201 sizeof(struct sctp_info),
206 info = nla_data(attr);
208 infox.sctpinfo = (struct sctp_info *)info;
210 sctp_diag_get_info(sk, r, &infox);
212 addr_list = asoc ? &asoc->base.bind_addr.address_list
213 : &ep->base.bind_addr.address_list;
214 if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
217 if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
218 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
221 if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
228 nlmsg_cancel(skb, nlh);
232 /* callback and param */
233 struct sctp_comm_param {
235 struct netlink_callback *cb;
236 const struct inet_diag_req_v2 *r;
237 const struct nlmsghdr *nlh;
241 static size_t inet_assoc_attr_size(struct sctp_association *asoc)
243 int addrlen = sizeof(struct sockaddr_storage);
245 struct sctp_sockaddr_entry *laddr;
247 list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
251 return nla_total_size(sizeof(struct sctp_info))
252 + nla_total_size(addrlen * asoc->peer.transport_count)
253 + nla_total_size(addrlen * addrcnt)
254 + nla_total_size(sizeof(struct inet_diag_msg))
255 + inet_diag_msg_attrs_size()
256 + nla_total_size(sizeof(struct inet_diag_meminfo))
260 static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
262 struct sctp_association *assoc = tsp->asoc;
263 struct sock *sk = tsp->asoc->base.sk;
264 struct sctp_comm_param *commp = p;
265 struct sk_buff *in_skb = commp->skb;
266 const struct inet_diag_req_v2 *req = commp->r;
267 const struct nlmsghdr *nlh = commp->nlh;
268 struct net *net = sock_net(in_skb->sk);
272 err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
277 rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
282 if (sk != assoc->base.sk) {
287 err = inet_sctp_diag_fill(sk, assoc, rep, req,
288 sk_user_ns(NETLINK_CB(in_skb).sk),
289 NETLINK_CB(in_skb).portid,
290 nlh->nlmsg_seq, 0, nlh,
294 WARN_ON(err == -EMSGSIZE);
299 err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
307 static int sctp_sock_dump(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
309 struct sctp_comm_param *commp = p;
310 struct sock *sk = ep->base.sk;
311 struct sk_buff *skb = commp->skb;
312 struct netlink_callback *cb = commp->cb;
313 const struct inet_diag_req_v2 *r = commp->r;
314 struct sctp_association *assoc;
318 if (ep != tsp->asoc->ep)
320 list_for_each_entry(assoc, &ep->asocs, asocs) {
321 if (cb->args[4] < cb->args[1])
324 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
327 if (r->id.idiag_dport != htons(assoc->peer.port) &&
332 inet_sctp_diag_fill(sk, NULL, skb, r,
333 sk_user_ns(NETLINK_CB(cb->skb).sk),
334 NETLINK_CB(cb->skb).portid,
336 NLM_F_MULTI, cb->nlh,
337 commp->net_admin) < 0) {
343 if (inet_sctp_diag_fill(sk, assoc, skb, r,
344 sk_user_ns(NETLINK_CB(cb->skb).sk),
345 NETLINK_CB(cb->skb).portid,
346 cb->nlh->nlmsg_seq, 0, cb->nlh,
347 commp->net_admin) < 0) {
362 static int sctp_sock_filter(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
364 struct sctp_comm_param *commp = p;
365 struct sock *sk = ep->base.sk;
366 const struct inet_diag_req_v2 *r = commp->r;
367 struct sctp_association *assoc =
368 list_entry(ep->asocs.next, struct sctp_association, asocs);
370 /* find the ep only once through the transports by this condition */
371 if (tsp->asoc != assoc)
374 if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
380 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
382 struct sctp_comm_param *commp = p;
383 struct sock *sk = ep->base.sk;
384 struct sk_buff *skb = commp->skb;
385 struct netlink_callback *cb = commp->cb;
386 const struct inet_diag_req_v2 *r = commp->r;
387 struct net *net = sock_net(skb->sk);
388 struct inet_sock *inet = inet_sk(sk);
391 if (!net_eq(sock_net(sk), net))
394 if (cb->args[4] < cb->args[1])
397 if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
400 if (r->sdiag_family != AF_UNSPEC &&
401 sk->sk_family != r->sdiag_family)
404 if (r->id.idiag_sport != inet->inet_sport &&
408 if (r->id.idiag_dport != inet->inet_dport &&
412 if (inet_sctp_diag_fill(sk, NULL, skb, r,
413 sk_user_ns(NETLINK_CB(cb->skb).sk),
414 NETLINK_CB(cb->skb).portid,
415 cb->nlh->nlmsg_seq, NLM_F_MULTI,
416 cb->nlh, commp->net_admin) < 0) {
426 /* define the functions for sctp_diag_handler*/
427 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
430 struct sctp_infox *infox = (struct sctp_infox *)info;
433 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
434 r->idiag_wqueue = infox->asoc->sndbuf_used;
436 r->idiag_rqueue = sk->sk_ack_backlog;
437 r->idiag_wqueue = sk->sk_max_ack_backlog;
440 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
443 static int sctp_diag_dump_one(struct sk_buff *in_skb,
444 const struct nlmsghdr *nlh,
445 const struct inet_diag_req_v2 *req)
447 struct net *net = sock_net(in_skb->sk);
448 union sctp_addr laddr, paddr;
449 struct sctp_comm_param commp = {
453 .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
456 if (req->sdiag_family == AF_INET) {
457 laddr.v4.sin_port = req->id.idiag_sport;
458 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
459 laddr.v4.sin_family = AF_INET;
461 paddr.v4.sin_port = req->id.idiag_dport;
462 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
463 paddr.v4.sin_family = AF_INET;
465 laddr.v6.sin6_port = req->id.idiag_sport;
466 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
467 sizeof(laddr.v6.sin6_addr));
468 laddr.v6.sin6_family = AF_INET6;
470 paddr.v6.sin6_port = req->id.idiag_dport;
471 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
472 sizeof(paddr.v6.sin6_addr));
473 paddr.v6.sin6_family = AF_INET6;
476 return sctp_transport_lookup_process(sctp_tsp_dump_one,
477 net, &laddr, &paddr, &commp);
480 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
481 const struct inet_diag_req_v2 *r, struct nlattr *bc)
483 u32 idiag_states = r->idiag_states;
484 struct net *net = sock_net(skb->sk);
485 struct sctp_comm_param commp = {
489 .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
491 int pos = cb->args[2];
493 /* eps hashtable dumps
495 * 0 : if it will traversal listen sock
496 * 1 : to record the sock pos of this time's traversal
497 * 4 : to work as a temporary variable to traversal list
499 if (cb->args[0] == 0) {
500 if (!(idiag_states & TCPF_LISTEN))
502 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
510 /* asocs by transport hashtable dump
512 * 1 : to record the assoc pos of this time's traversal
513 * 2 : to record the transport pos of this time's traversal
514 * 3 : to mark if we have dumped the ep info of the current asoc
515 * 4 : to work as a temporary variable to traversal list
516 * 5 : to save the sk we get from travelsing the tsp list.
518 if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
521 sctp_transport_traverse_process(sctp_sock_filter, sctp_sock_dump,
526 cb->args[1] = cb->args[4];
530 static const struct inet_diag_handler sctp_diag_handler = {
531 .dump = sctp_diag_dump,
532 .dump_one = sctp_diag_dump_one,
533 .idiag_get_info = sctp_diag_get_info,
534 .idiag_type = IPPROTO_SCTP,
535 .idiag_info_size = sizeof(struct sctp_info),
538 static int __init sctp_diag_init(void)
540 return inet_diag_register(&sctp_diag_handler);
543 static void __exit sctp_diag_exit(void)
545 inet_diag_unregister(&sctp_diag_handler);
548 module_init(sctp_diag_init);
549 module_exit(sctp_diag_exit);
550 MODULE_LICENSE("GPL");
551 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);