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