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 extern void inet_diag_msg_common_fill(struct inet_diag_msg *r,
   7                                       struct sock *sk);
   8 extern int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
   9                                     struct inet_diag_msg *r, int ext,
  10                                     struct user_namespace *user_ns);
  11
  12 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
  13                                void *info);
  14
  15 /* define some functions to make asoc/ep fill look clean */
  16 static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
  17                                         struct sock *sk,
  18                                         struct sctp_association *asoc)
  19 {
  20         union sctp_addr laddr, paddr;
  21         struct dst_entry *dst;
  22
  23         laddr = list_entry(asoc->base.bind_addr.address_list.next,
  24                            struct sctp_sockaddr_entry, list)->a;
  25         paddr = asoc->peer.primary_path->ipaddr;
  26         dst = asoc->peer.primary_path->dst;
  27
  28         r->idiag_family = sk->sk_family;
  29         r->id.idiag_sport = htons(asoc->base.bind_addr.port);
  30         r->id.idiag_dport = htons(asoc->peer.port);
  31         r->id.idiag_if = dst ? dst->dev->ifindex : 0;
  32         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  33
  34 #if IS_ENABLED(CONFIG_IPV6)
  35         if (sk->sk_family == AF_INET6) {
  36                 *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
  37                 *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
  38         } else
  39 #endif
  40         {
  41                 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  42                 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  43
  44                 r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
  45                 r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
  46         }
  47
  48         r->idiag_state = asoc->state;
  49         r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
  50         r->idiag_retrans = asoc->rtx_data_chunks;
  51         r->idiag_expires = jiffies_to_msecs(
  52                 asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] - jiffies);
  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                 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk);
 149                 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
 150                 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
 151                 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
 152                 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
 153                 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
 154                 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
 155                 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
 156
 157                 if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
 158                         goto errout;
 159         }
 160
 161         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 162                 struct nlattr *attr;
 163
 164                 attr = nla_reserve(skb, INET_DIAG_INFO,
 165                                    sizeof(struct sctp_info));
 166                 if (!attr)
 167                         goto errout;
 168
 169                 info = nla_data(attr);
 170         }
 171         infox.sctpinfo = (struct sctp_info *)info;
 172         infox.asoc = asoc;
 173         sctp_diag_get_info(sk, r, &infox);
 174
 175         addr_list = asoc ? &asoc->base.bind_addr.address_list
 176                          : &ep->base.bind_addr.address_list;
 177         if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
 178                 goto errout;
 179
 180         if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
 181                 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
 182                         goto errout;
 183
 184         if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
 185                 goto errout;
 186
 187         nlmsg_end(skb, nlh);
 188         return 0;
 189
 190 errout:
 191         nlmsg_cancel(skb, nlh);
 192         return -EMSGSIZE;
 193 }
 194
 195 /* callback and param */
 196 struct sctp_comm_param {
 197         struct sk_buff *skb;
 198         struct netlink_callback *cb;
 199         const struct inet_diag_req_v2 *r;
 200         const struct nlmsghdr *nlh;
 201 };
 202
 203 static size_t inet_assoc_attr_size(struct sctp_association *asoc)
 204 {
 205         int addrlen = sizeof(struct sockaddr_storage);
 206         int addrcnt = 0;
 207         struct sctp_sockaddr_entry *laddr;
 208
 209         list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
 210                                 list)
 211                 addrcnt++;
 212
 213         return    nla_total_size(sizeof(struct sctp_info))
 214                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
 215                 + nla_total_size(1) /* INET_DIAG_TOS */
 216                 + nla_total_size(1) /* INET_DIAG_TCLASS */
 217                 + nla_total_size(addrlen * asoc->peer.transport_count)
 218                 + nla_total_size(addrlen * addrcnt)
 219                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 220                 + nla_total_size(sizeof(struct inet_diag_msg))
 221                 + 64;
 222 }
 223
 224 static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
 225 {
 226         struct sctp_association *assoc = tsp->asoc;
 227         struct sock *sk = tsp->asoc->base.sk;
 228         struct sctp_comm_param *commp = p;
 229         struct sk_buff *in_skb = commp->skb;
 230         const struct inet_diag_req_v2 *req = commp->r;
 231         const struct nlmsghdr *nlh = commp->nlh;
 232         struct net *net = sock_net(in_skb->sk);
 233         struct sk_buff *rep;
 234         int err;
 235
 236         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 237         if (err)
 238                 goto out;
 239
 240         err = -ENOMEM;
 241         rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
 242         if (!rep)
 243                 goto out;
 244
 245         lock_sock(sk);
 246         if (sk != assoc->base.sk) {
 247                 release_sock(sk);
 248                 sk = assoc->base.sk;
 249                 lock_sock(sk);
 250         }
 251         err = inet_sctp_diag_fill(sk, assoc, rep, req,
 252                                   sk_user_ns(NETLINK_CB(in_skb).sk),
 253                                   NETLINK_CB(in_skb).portid,
 254                                   nlh->nlmsg_seq, 0, nlh);
 255         release_sock(sk);
 256         if (err < 0) {
 257                 WARN_ON(err == -EMSGSIZE);
 258                 kfree_skb(rep);
 259                 goto out;
 260         }
 261
 262         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 263                               MSG_DONTWAIT);
 264         if (err > 0)
 265                 err = 0;
 266 out:
 267         return err;
 268 }
 269
 270 static int sctp_tsp_dump(struct sctp_transport *tsp, void *p)
 271 {
 272         struct sctp_endpoint *ep = tsp->asoc->ep;
 273         struct sctp_comm_param *commp = p;
 274         struct sock *sk = ep->base.sk;
 275         struct sk_buff *skb = commp->skb;
 276         struct netlink_callback *cb = commp->cb;
 277         const struct inet_diag_req_v2 *r = commp->r;
 278         struct sctp_association *assoc =
 279                 list_entry(ep->asocs.next, struct sctp_association, asocs);
 280         int err = 0;
 281
 282         /* find the ep only once through the transports by this condition */
 283         if (tsp->asoc != assoc)
 284                 goto out;
 285
 286         if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
 287                 goto out;
 288
 289         lock_sock(sk);
 290         if (sk != assoc->base.sk)
 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) < 0) {
 309                         cb->args[3] = 1;
 310                         err = 2;
 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) < 0) {
 319                         err = 2;
 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         return err;
 332 out:
 333         cb->args[2]++;
 334         return err;
 335 }
 336
 337 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
 338 {
 339         struct sctp_comm_param *commp = p;
 340         struct sock *sk = ep->base.sk;
 341         struct sk_buff *skb = commp->skb;
 342         struct netlink_callback *cb = commp->cb;
 343         const struct inet_diag_req_v2 *r = commp->r;
 344         struct net *net = sock_net(skb->sk);
 345         struct inet_sock *inet = inet_sk(sk);
 346         int err = 0;
 347
 348         if (!net_eq(sock_net(sk), net))
 349                 goto out;
 350
 351         if (cb->args[4] < cb->args[1])
 352                 goto next;
 353
 354         if (r->sdiag_family != AF_UNSPEC &&
 355             sk->sk_family != r->sdiag_family)
 356                 goto next;
 357
 358         if (r->id.idiag_sport != inet->inet_sport &&
 359             r->id.idiag_sport)
 360                 goto next;
 361
 362         if (r->id.idiag_dport != inet->inet_dport &&
 363             r->id.idiag_dport)
 364                 goto next;
 365
 366         if (inet_sctp_diag_fill(sk, NULL, skb, r,
 367                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
 368                                 NETLINK_CB(cb->skb).portid,
 369                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 370                                 cb->nlh) < 0) {
 371                 err = 2;
 372                 goto out;
 373         }
 374 next:
 375         cb->args[4]++;
 376 out:
 377         return err;
 378 }
 379
 380 /* define the functions for sctp_diag_handler*/
 381 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 382                                void *info)
 383 {
 384         struct sctp_infox *infox = (struct sctp_infox *)info;
 385
 386         if (infox->asoc) {
 387                 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
 388                 r->idiag_wqueue = infox->asoc->sndbuf_used;
 389         } else {
 390                 r->idiag_rqueue = sk->sk_ack_backlog;
 391                 r->idiag_wqueue = sk->sk_max_ack_backlog;
 392         }
 393         if (infox->sctpinfo)
 394                 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
 395 }
 396
 397 static int sctp_diag_dump_one(struct sk_buff *in_skb,
 398                               const struct nlmsghdr *nlh,
 399                               const struct inet_diag_req_v2 *req)
 400 {
 401         struct net *net = sock_net(in_skb->sk);
 402         union sctp_addr laddr, paddr;
 403         struct sctp_comm_param commp = {
 404                 .skb = in_skb,
 405                 .r = req,
 406                 .nlh = nlh,
 407         };
 408
 409         if (req->sdiag_family == AF_INET) {
 410                 laddr.v4.sin_port = req->id.idiag_sport;
 411                 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
 412                 laddr.v4.sin_family = AF_INET;
 413
 414                 paddr.v4.sin_port = req->id.idiag_dport;
 415                 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
 416                 paddr.v4.sin_family = AF_INET;
 417         } else {
 418                 laddr.v6.sin6_port = req->id.idiag_sport;
 419                 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src, 64);
 420                 laddr.v6.sin6_family = AF_INET6;
 421
 422                 paddr.v6.sin6_port = req->id.idiag_dport;
 423                 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, 64);
 424                 paddr.v6.sin6_family = AF_INET6;
 425         }
 426
 427         return sctp_transport_lookup_process(sctp_tsp_dump_one,
 428                                              net, &laddr, &paddr, &commp);
 429 }
 430
 431 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 432                            const struct inet_diag_req_v2 *r, struct nlattr *bc)
 433 {
 434         u32 idiag_states = r->idiag_states;
 435         struct net *net = sock_net(skb->sk);
 436         struct sctp_comm_param commp = {
 437                 .skb = skb,
 438                 .cb = cb,
 439                 .r = r,
 440         };
 441
 442         /* eps hashtable dumps
 443          * args:
 444          * 0 : if it will traversal listen sock
 445          * 1 : to record the sock pos of this time's traversal
 446          * 4 : to work as a temporary variable to traversal list
 447          */
 448         if (cb->args[0] == 0) {
 449                 if (!(idiag_states & TCPF_LISTEN))
 450                         goto skip;
 451                 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
 452                         goto done;
 453 skip:
 454                 cb->args[0] = 1;
 455                 cb->args[1] = 0;
 456                 cb->args[4] = 0;
 457         }
 458
 459         /* asocs by transport hashtable dump
 460          * args:
 461          * 1 : to record the assoc pos of this time's traversal
 462          * 2 : to record the transport pos of this time's traversal
 463          * 3 : to mark if we have dumped the ep info of the current asoc
 464          * 4 : to work as a temporary variable to traversal list
 465          */
 466         if (!(idiag_states & ~TCPF_LISTEN))
 467                 goto done;
 468         sctp_for_each_transport(sctp_tsp_dump, net, cb->args[2], &commp);
 469 done:
 470         cb->args[1] = cb->args[4];
 471         cb->args[4] = 0;
 472 }
 473
 474 static const struct inet_diag_handler sctp_diag_handler = {
 475         .dump            = sctp_diag_dump,
 476         .dump_one        = sctp_diag_dump_one,
 477         .idiag_get_info  = sctp_diag_get_info,
 478         .idiag_type      = IPPROTO_SCTP,
 479         .idiag_info_size = sizeof(struct sctp_info),
 480 };
 481
 482 static int __init sctp_diag_init(void)
 483 {
 484         return inet_diag_register(&sctp_diag_handler);
 485 }
 486
 487 static void __exit sctp_diag_exit(void)
 488 {
 489         inet_diag_unregister(&sctp_diag_handler);
 490 }
 491
 492 module_init(sctp_diag_init);
 493 module_exit(sctp_diag_exit);
 494 MODULE_LICENSE("GPL");
 495 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);