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