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         }
  49 }
  50
  51 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
  52                                          struct list_head *address_list)
  53 {
  54         struct sctp_sockaddr_entry *laddr;
  55         int addrlen = sizeof(struct sockaddr_storage);
  56         int addrcnt = 0;
  57         struct nlattr *attr;
  58         void *info = NULL;
  59
  60         list_for_each_entry_rcu(laddr, address_list, list)
  61                 addrcnt++;
  62
  63         attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
  64         if (!attr)
  65                 return -EMSGSIZE;
  66
  67         info = nla_data(attr);
  68         list_for_each_entry_rcu(laddr, address_list, list) {
  69                 memcpy(info, &laddr->a, sizeof(laddr->a));
  70                 memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
  71                 info += addrlen;
  72         }
  73
  74         return 0;
  75 }
  76
  77 static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
  78                                         struct sctp_association *asoc)
  79 {
  80         int addrlen = sizeof(struct sockaddr_storage);
  81         struct sctp_transport *from;
  82         struct nlattr *attr;
  83         void *info = NULL;
  84
  85         attr = nla_reserve(skb, INET_DIAG_PEERS,
  86                            addrlen * asoc->peer.transport_count);
  87         if (!attr)
  88                 return -EMSGSIZE;
  89
  90         info = nla_data(attr);
  91         list_for_each_entry(from, &asoc->peer.transport_addr_list,
  92                             transports) {
  93                 memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
  94                 memset(info + sizeof(from->ipaddr), 0,
  95                        addrlen - sizeof(from->ipaddr));
  96                 info += addrlen;
  97         }
  98
  99         return 0;
 100 }
 101
 102 /* sctp asoc/ep fill*/
 103 static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
 104                                struct sk_buff *skb,
 105                                const struct inet_diag_req_v2 *req,
 106                                struct user_namespace *user_ns,
 107                                int portid, u32 seq, u16 nlmsg_flags,
 108                                const struct nlmsghdr *unlh,
 109                                bool net_admin)
 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         r->idiag_timer = 0;
 128         r->idiag_retrans = 0;
 129         r->idiag_expires = 0;
 130         if (asoc) {
 131                 inet_diag_msg_sctpasoc_fill(r, sk, asoc);
 132         } else {
 133                 inet_diag_msg_common_fill(r, sk);
 134                 r->idiag_state = sk->sk_state;
 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(addrlen * asoc->peer.transport_count)
 222                 + nla_total_size(addrlen * addrcnt)
 223                 + nla_total_size(sizeof(struct inet_diag_msg))
 224                 + inet_diag_msg_attrs_size()
 225                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 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                                   commp->net_admin);
 261         release_sock(sk);
 262         if (err < 0) {
 263                 WARN_ON(err == -EMSGSIZE);
 264                 kfree_skb(rep);
 265                 goto out;
 266         }
 267
 268         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 269                               MSG_DONTWAIT);
 270         if (err > 0)
 271                 err = 0;
 272 out:
 273         return err;
 274 }
 275
 276 static int sctp_sock_dump(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
 277 {
 278         struct sctp_comm_param *commp = p;
 279         struct sock *sk = ep->base.sk;
 280         struct sk_buff *skb = commp->skb;
 281         struct netlink_callback *cb = commp->cb;
 282         const struct inet_diag_req_v2 *r = commp->r;
 283         struct sctp_association *assoc;
 284         int err = 0;
 285
 286         lock_sock(sk);
 287         if (ep != tsp->asoc->ep)
 288                 goto release;
 289         list_for_each_entry(assoc, &ep->asocs, asocs) {
 290                 if (cb->args[4] < cb->args[1])
 291                         goto next;
 292
 293                 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
 294                     r->id.idiag_sport)
 295                         goto next;
 296                 if (r->id.idiag_dport != htons(assoc->peer.port) &&
 297                     r->id.idiag_dport)
 298                         goto next;
 299
 300                 if (!cb->args[3] &&
 301                     inet_sctp_diag_fill(sk, NULL, skb, r,
 302                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 303                                         NETLINK_CB(cb->skb).portid,
 304                                         cb->nlh->nlmsg_seq,
 305                                         NLM_F_MULTI, cb->nlh,
 306                                         commp->net_admin) < 0) {
 307                         err = 1;
 308                         goto release;
 309                 }
 310                 cb->args[3] = 1;
 311
 312                 if (inet_sctp_diag_fill(sk, assoc, skb, r,
 313                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 314                                         NETLINK_CB(cb->skb).portid,
 315                                         cb->nlh->nlmsg_seq, 0, cb->nlh,
 316                                         commp->net_admin) < 0) {
 317                         err = 1;
 318                         goto release;
 319                 }
 320 next:
 321                 cb->args[4]++;
 322         }
 323         cb->args[1] = 0;
 324         cb->args[3] = 0;
 325         cb->args[4] = 0;
 326 release:
 327         release_sock(sk);
 328         return err;
 329 }
 330
 331 static int sctp_sock_filter(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
 332 {
 333         struct sctp_comm_param *commp = p;
 334         struct sock *sk = ep->base.sk;
 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                 return 0;
 342
 343         if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
 344                 return 0;
 345
 346         return 1;
 347 }
 348
 349 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
 350 {
 351         struct sctp_comm_param *commp = p;
 352         struct sock *sk = ep->base.sk;
 353         struct sk_buff *skb = commp->skb;
 354         struct netlink_callback *cb = commp->cb;
 355         const struct inet_diag_req_v2 *r = commp->r;
 356         struct net *net = sock_net(skb->sk);
 357         struct inet_sock *inet = inet_sk(sk);
 358         int err = 0;
 359
 360         if (!net_eq(sock_net(sk), net))
 361                 goto out;
 362
 363         if (cb->args[4] < cb->args[1])
 364                 goto next;
 365
 366         if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
 367                 goto next;
 368
 369         if (r->sdiag_family != AF_UNSPEC &&
 370             sk->sk_family != r->sdiag_family)
 371                 goto next;
 372
 373         if (r->id.idiag_sport != inet->inet_sport &&
 374             r->id.idiag_sport)
 375                 goto next;
 376
 377         if (r->id.idiag_dport != inet->inet_dport &&
 378             r->id.idiag_dport)
 379                 goto next;
 380
 381         if (inet_sctp_diag_fill(sk, NULL, skb, r,
 382                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
 383                                 NETLINK_CB(cb->skb).portid,
 384                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 385                                 cb->nlh, commp->net_admin) < 0) {
 386                 err = 2;
 387                 goto out;
 388         }
 389 next:
 390         cb->args[4]++;
 391 out:
 392         return err;
 393 }
 394
 395 /* define the functions for sctp_diag_handler*/
 396 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 397                                void *info)
 398 {
 399         struct sctp_infox *infox = (struct sctp_infox *)info;
 400
 401         if (infox->asoc) {
 402                 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
 403                 r->idiag_wqueue = infox->asoc->sndbuf_used;
 404         } else {
 405                 r->idiag_rqueue = sk->sk_ack_backlog;
 406                 r->idiag_wqueue = sk->sk_max_ack_backlog;
 407         }
 408         if (infox->sctpinfo)
 409                 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
 410 }
 411
 412 static int sctp_diag_dump_one(struct sk_buff *in_skb,
 413                               const struct nlmsghdr *nlh,
 414                               const struct inet_diag_req_v2 *req)
 415 {
 416         struct net *net = sock_net(in_skb->sk);
 417         union sctp_addr laddr, paddr;
 418         struct sctp_comm_param commp = {
 419                 .skb = in_skb,
 420                 .r = req,
 421                 .nlh = nlh,
 422                 .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
 423         };
 424
 425         if (req->sdiag_family == AF_INET) {
 426                 laddr.v4.sin_port = req->id.idiag_sport;
 427                 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
 428                 laddr.v4.sin_family = AF_INET;
 429
 430                 paddr.v4.sin_port = req->id.idiag_dport;
 431                 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
 432                 paddr.v4.sin_family = AF_INET;
 433         } else {
 434                 laddr.v6.sin6_port = req->id.idiag_sport;
 435                 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
 436                        sizeof(laddr.v6.sin6_addr));
 437                 laddr.v6.sin6_family = AF_INET6;
 438
 439                 paddr.v6.sin6_port = req->id.idiag_dport;
 440                 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
 441                        sizeof(paddr.v6.sin6_addr));
 442                 paddr.v6.sin6_family = AF_INET6;
 443         }
 444
 445         return sctp_transport_lookup_process(sctp_tsp_dump_one,
 446                                              net, &laddr, &paddr, &commp);
 447 }
 448
 449 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 450                            const struct inet_diag_req_v2 *r, struct nlattr *bc)
 451 {
 452         u32 idiag_states = r->idiag_states;
 453         struct net *net = sock_net(skb->sk);
 454         struct sctp_comm_param commp = {
 455                 .skb = skb,
 456                 .cb = cb,
 457                 .r = r,
 458                 .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
 459         };
 460         int pos = cb->args[2];
 461
 462         /* eps hashtable dumps
 463          * args:
 464          * 0 : if it will traversal listen sock
 465          * 1 : to record the sock pos of this time's traversal
 466          * 4 : to work as a temporary variable to traversal list
 467          */
 468         if (cb->args[0] == 0) {
 469                 if (!(idiag_states & TCPF_LISTEN))
 470                         goto skip;
 471                 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
 472                         goto done;
 473 skip:
 474                 cb->args[0] = 1;
 475                 cb->args[1] = 0;
 476                 cb->args[4] = 0;
 477         }
 478
 479         /* asocs by transport hashtable dump
 480          * args:
 481          * 1 : to record the assoc pos of this time's traversal
 482          * 2 : to record the transport pos of this time's traversal
 483          * 3 : to mark if we have dumped the ep info of the current asoc
 484          * 4 : to work as a temporary variable to traversal list
 485          * 5 : to save the sk we get from travelsing the tsp list.
 486          */
 487         if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
 488                 goto done;
 489
 490         sctp_transport_traverse_process(sctp_sock_filter, sctp_sock_dump,
 491                                         net, &pos, &commp);
 492         cb->args[2] = pos;
 493
 494 done:
 495         cb->args[1] = cb->args[4];
 496         cb->args[4] = 0;
 497 }
 498
 499 static const struct inet_diag_handler sctp_diag_handler = {
 500         .dump            = sctp_diag_dump,
 501         .dump_one        = sctp_diag_dump_one,
 502         .idiag_get_info  = sctp_diag_get_info,
 503         .idiag_type      = IPPROTO_SCTP,
 504         .idiag_info_size = sizeof(struct sctp_info),
 505 };
 506
 507 static int __init sctp_diag_init(void)
 508 {
 509         return inet_diag_register(&sctp_diag_handler);
 510 }
 511
 512 static void __exit sctp_diag_exit(void)
 513 {
 514         inet_diag_unregister(&sctp_diag_handler);
 515 }
 516
 517 module_init(sctp_diag_init);
 518 module_exit(sctp_diag_exit);
 519 MODULE_LICENSE("GPL");
 520 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);