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_tsp_dump(struct sctp_transport *tsp, void *p)
 280 {
 281         struct sctp_endpoint *ep = tsp->asoc->ep;
 282         struct sctp_comm_param *commp = p;
 283         struct sock *sk = ep->base.sk;
 284         struct sk_buff *skb = commp->skb;
 285         struct netlink_callback *cb = commp->cb;
 286         const struct inet_diag_req_v2 *r = commp->r;
 287         struct sctp_association *assoc =
 288                 list_entry(ep->asocs.next, struct sctp_association, asocs);
 289         int err = 0;
 290
 291         /* find the ep only once through the transports by this condition */
 292         if (tsp->asoc != assoc)
 293                 goto out;
 294
 295         if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
 296                 goto out;
 297
 298         lock_sock(sk);
 299         if (sk != assoc->base.sk)
 300                 goto release;
 301         list_for_each_entry(assoc, &ep->asocs, asocs) {
 302                 if (cb->args[4] < cb->args[1])
 303                         goto next;
 304
 305                 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
 306                     r->id.idiag_sport)
 307                         goto next;
 308                 if (r->id.idiag_dport != htons(assoc->peer.port) &&
 309                     r->id.idiag_dport)
 310                         goto next;
 311
 312                 if (!cb->args[3] &&
 313                     inet_sctp_diag_fill(sk, NULL, skb, r,
 314                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 315                                         NETLINK_CB(cb->skb).portid,
 316                                         cb->nlh->nlmsg_seq,
 317                                         NLM_F_MULTI, cb->nlh,
 318                                         commp->net_admin) < 0) {
 319                         cb->args[3] = 1;
 320                         err = 2;
 321                         goto release;
 322                 }
 323                 cb->args[3] = 1;
 324
 325                 if (inet_sctp_diag_fill(sk, assoc, skb, r,
 326                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 327                                         NETLINK_CB(cb->skb).portid,
 328                                         cb->nlh->nlmsg_seq, 0, cb->nlh,
 329                                         commp->net_admin) < 0) {
 330                         err = 2;
 331                         goto release;
 332                 }
 333 next:
 334                 cb->args[4]++;
 335         }
 336         cb->args[1] = 0;
 337         cb->args[2]++;
 338         cb->args[3] = 0;
 339         cb->args[4] = 0;
 340 release:
 341         release_sock(sk);
 342         return err;
 343 out:
 344         cb->args[2]++;
 345         return err;
 346 }
 347
 348 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
 349 {
 350         struct sctp_comm_param *commp = p;
 351         struct sock *sk = ep->base.sk;
 352         struct sk_buff *skb = commp->skb;
 353         struct netlink_callback *cb = commp->cb;
 354         const struct inet_diag_req_v2 *r = commp->r;
 355         struct net *net = sock_net(skb->sk);
 356         struct inet_sock *inet = inet_sk(sk);
 357         int err = 0;
 358
 359         if (!net_eq(sock_net(sk), net))
 360                 goto out;
 361
 362         if (cb->args[4] < cb->args[1])
 363                 goto next;
 364
 365         if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
 366                 goto next;
 367
 368         if (r->sdiag_family != AF_UNSPEC &&
 369             sk->sk_family != r->sdiag_family)
 370                 goto next;
 371
 372         if (r->id.idiag_sport != inet->inet_sport &&
 373             r->id.idiag_sport)
 374                 goto next;
 375
 376         if (r->id.idiag_dport != inet->inet_dport &&
 377             r->id.idiag_dport)
 378                 goto next;
 379
 380         if (inet_sctp_diag_fill(sk, NULL, skb, r,
 381                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
 382                                 NETLINK_CB(cb->skb).portid,
 383                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 384                                 cb->nlh, commp->net_admin) < 0) {
 385                 err = 2;
 386                 goto out;
 387         }
 388 next:
 389         cb->args[4]++;
 390 out:
 391         return err;
 392 }
 393
 394 /* define the functions for sctp_diag_handler*/
 395 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 396                                void *info)
 397 {
 398         struct sctp_infox *infox = (struct sctp_infox *)info;
 399
 400         if (infox->asoc) {
 401                 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
 402                 r->idiag_wqueue = infox->asoc->sndbuf_used;
 403         } else {
 404                 r->idiag_rqueue = sk->sk_ack_backlog;
 405                 r->idiag_wqueue = sk->sk_max_ack_backlog;
 406         }
 407         if (infox->sctpinfo)
 408                 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
 409 }
 410
 411 static int sctp_diag_dump_one(struct sk_buff *in_skb,
 412                               const struct nlmsghdr *nlh,
 413                               const struct inet_diag_req_v2 *req)
 414 {
 415         struct net *net = sock_net(in_skb->sk);
 416         union sctp_addr laddr, paddr;
 417         struct sctp_comm_param commp = {
 418                 .skb = in_skb,
 419                 .r = req,
 420                 .nlh = nlh,
 421                 .net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN),
 422         };
 423
 424         if (req->sdiag_family == AF_INET) {
 425                 laddr.v4.sin_port = req->id.idiag_sport;
 426                 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
 427                 laddr.v4.sin_family = AF_INET;
 428
 429                 paddr.v4.sin_port = req->id.idiag_dport;
 430                 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
 431                 paddr.v4.sin_family = AF_INET;
 432         } else {
 433                 laddr.v6.sin6_port = req->id.idiag_sport;
 434                 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
 435                        sizeof(laddr.v6.sin6_addr));
 436                 laddr.v6.sin6_family = AF_INET6;
 437
 438                 paddr.v6.sin6_port = req->id.idiag_dport;
 439                 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
 440                        sizeof(paddr.v6.sin6_addr));
 441                 paddr.v6.sin6_family = AF_INET6;
 442         }
 443
 444         return sctp_transport_lookup_process(sctp_tsp_dump_one,
 445                                              net, &laddr, &paddr, &commp);
 446 }
 447
 448 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 449                            const struct inet_diag_req_v2 *r, struct nlattr *bc)
 450 {
 451         u32 idiag_states = r->idiag_states;
 452         struct net *net = sock_net(skb->sk);
 453         struct sctp_comm_param commp = {
 454                 .skb = skb,
 455                 .cb = cb,
 456                 .r = r,
 457                 .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
 458         };
 459
 460         /* eps hashtable dumps
 461          * args:
 462          * 0 : if it will traversal listen sock
 463          * 1 : to record the sock pos of this time's traversal
 464          * 4 : to work as a temporary variable to traversal list
 465          */
 466         if (cb->args[0] == 0) {
 467                 if (!(idiag_states & TCPF_LISTEN))
 468                         goto skip;
 469                 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
 470                         goto done;
 471 skip:
 472                 cb->args[0] = 1;
 473                 cb->args[1] = 0;
 474                 cb->args[4] = 0;
 475         }
 476
 477         /* asocs by transport hashtable dump
 478          * args:
 479          * 1 : to record the assoc pos of this time's traversal
 480          * 2 : to record the transport pos of this time's traversal
 481          * 3 : to mark if we have dumped the ep info of the current asoc
 482          * 4 : to work as a temporary variable to traversal list
 483          */
 484         if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
 485                 goto done;
 486         sctp_for_each_transport(sctp_tsp_dump, net, cb->args[2], &commp);
 487 done:
 488         cb->args[1] = cb->args[4];
 489         cb->args[4] = 0;
 490 }
 491
 492 static const struct inet_diag_handler sctp_diag_handler = {
 493         .dump            = sctp_diag_dump,
 494         .dump_one        = sctp_diag_dump_one,
 495         .idiag_get_info  = sctp_diag_get_info,
 496         .idiag_type      = IPPROTO_SCTP,
 497         .idiag_info_size = sizeof(struct sctp_info),
 498 };
 499
 500 static int __init sctp_diag_init(void)
 501 {
 502         return inet_diag_register(&sctp_diag_handler);
 503 }
 504
 505 static void __exit sctp_diag_exit(void)
 506 {
 507         inet_diag_unregister(&sctp_diag_handler);
 508 }
 509
 510 module_init(sctp_diag_init);
 511 module_exit(sctp_diag_exit);
 512 MODULE_LICENSE("GPL");
 513 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);