net/sctp/sctp_diag.c

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