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
  17         laddr = list_entry(asoc->base.bind_addr.address_list.next,
  18                            struct sctp_sockaddr_entry, list)->a;
  19         paddr = asoc->peer.primary_path->ipaddr;
  20         dst = asoc->peer.primary_path->dst;
  21
  22         r->idiag_family = sk->sk_family;
  23         r->id.idiag_sport = htons(asoc->base.bind_addr.port);
  24         r->id.idiag_dport = htons(asoc->peer.port);
  25         r->id.idiag_if = dst ? dst->dev->ifindex : 0;
  26         sock_diag_save_cookie(sk, r->id.idiag_cookie);
  27
  28 #if IS_ENABLED(CONFIG_IPV6)
  29         if (sk->sk_family == AF_INET6) {
  30                 *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
  31                 *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
  32         } else
  33 #endif
  34         {
  35                 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
  36                 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
  37
  38                 r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
  39                 r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
  40         }
  41
  42         r->idiag_state = asoc->state;
  43         r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
  44         r->idiag_retrans = asoc->rtx_data_chunks;
  45         r->idiag_expires = jiffies_to_msecs(
  46                 asoc->timeouts[SCTP_EVENT_TIMEOUT_T3_RTX] - jiffies);
  47 }
  48
  49 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
  50                                          struct list_head *address_list)
  51 {
  52         struct sctp_sockaddr_entry *laddr;
  53         int addrlen = sizeof(struct sockaddr_storage);
  54         int addrcnt = 0;
  55         struct nlattr *attr;
  56         void *info = NULL;
  57
  58         list_for_each_entry_rcu(laddr, address_list, list)
  59                 addrcnt++;
  60
  61         attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
  62         if (!attr)
  63                 return -EMSGSIZE;
  64
  65         info = nla_data(attr);
  66         list_for_each_entry_rcu(laddr, address_list, list) {
  67                 memcpy(info, &laddr->a, addrlen);
  68                 info += addrlen;
  69         }
  70
  71         return 0;
  72 }
  73
  74 static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
  75                                         struct sctp_association *asoc)
  76 {
  77         int addrlen = sizeof(struct sockaddr_storage);
  78         struct sctp_transport *from;
  79         struct nlattr *attr;
  80         void *info = NULL;
  81
  82         attr = nla_reserve(skb, INET_DIAG_PEERS,
  83                            addrlen * asoc->peer.transport_count);
  84         if (!attr)
  85                 return -EMSGSIZE;
  86
  87         info = nla_data(attr);
  88         list_for_each_entry(from, &asoc->peer.transport_addr_list,
  89                             transports) {
  90                 memcpy(info, &from->ipaddr, addrlen);
  91                 info += addrlen;
  92         }
  93
  94         return 0;
  95 }
  96
  97 /* sctp asoc/ep fill*/
  98 static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
  99                                struct sk_buff *skb,
 100                                const struct inet_diag_req_v2 *req,
 101                                struct user_namespace *user_ns,
 102                                int portid, u32 seq, u16 nlmsg_flags,
 103                                const struct nlmsghdr *unlh)
 104 {
 105         struct sctp_endpoint *ep = sctp_sk(sk)->ep;
 106         struct list_head *addr_list;
 107         struct inet_diag_msg *r;
 108         struct nlmsghdr  *nlh;
 109         int ext = req->idiag_ext;
 110         struct sctp_infox infox;
 111         void *info = NULL;
 112
 113         nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
 114                         nlmsg_flags);
 115         if (!nlh)
 116                 return -EMSGSIZE;
 117
 118         r = nlmsg_data(nlh);
 119         BUG_ON(!sk_fullsock(sk));
 120
 121         if (asoc) {
 122                 inet_diag_msg_sctpasoc_fill(r, sk, asoc);
 123         } else {
 124                 inet_diag_msg_common_fill(r, sk);
 125                 r->idiag_state = sk->sk_state;
 126                 r->idiag_timer = 0;
 127                 r->idiag_retrans = 0;
 128         }
 129
 130         if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns))
 131                 goto errout;
 132
 133         if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
 134                 u32 mem[SK_MEMINFO_VARS];
 135                 int amt;
 136
 137                 if (asoc && asoc->ep->sndbuf_policy)
 138                         amt = asoc->sndbuf_used;
 139                 else
 140                         amt = sk_wmem_alloc_get(sk);
 141                 mem[SK_MEMINFO_WMEM_ALLOC] = amt;
 142                 if (asoc && asoc->ep->rcvbuf_policy)
 143                         amt = atomic_read(&asoc->rmem_alloc);
 144                 else
 145                         amt = sk_rmem_alloc_get(sk);
 146                 mem[SK_MEMINFO_RMEM_ALLOC] = amt;
 147                 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
 148                 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
 149                 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
 150                 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
 151                 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
 152                 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
 153                 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
 154
 155                 if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
 156                         goto errout;
 157         }
 158
 159         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 160                 struct nlattr *attr;
 161
 162                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
 163                                          sizeof(struct sctp_info),
 164                                          INET_DIAG_PAD);
 165                 if (!attr)
 166                         goto errout;
 167
 168                 info = nla_data(attr);
 169         }
 170         infox.sctpinfo = (struct sctp_info *)info;
 171         infox.asoc = asoc;
 172         sctp_diag_get_info(sk, r, &infox);
 173
 174         addr_list = asoc ? &asoc->base.bind_addr.address_list
 175                          : &ep->base.bind_addr.address_list;
 176         if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
 177                 goto errout;
 178
 179         if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
 180                 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
 181                         goto errout;
 182
 183         if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
 184                 goto errout;
 185
 186         nlmsg_end(skb, nlh);
 187         return 0;
 188
 189 errout:
 190         nlmsg_cancel(skb, nlh);
 191         return -EMSGSIZE;
 192 }
 193
 194 /* callback and param */
 195 struct sctp_comm_param {
 196         struct sk_buff *skb;
 197         struct netlink_callback *cb;
 198         const struct inet_diag_req_v2 *r;
 199         const struct nlmsghdr *nlh;
 200 };
 201
 202 static size_t inet_assoc_attr_size(struct sctp_association *asoc)
 203 {
 204         int addrlen = sizeof(struct sockaddr_storage);
 205         int addrcnt = 0;
 206         struct sctp_sockaddr_entry *laddr;
 207
 208         list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
 209                                 list)
 210                 addrcnt++;
 211
 212         return    nla_total_size(sizeof(struct sctp_info))
 213                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
 214                 + nla_total_size(1) /* INET_DIAG_TOS */
 215                 + nla_total_size(1) /* INET_DIAG_TCLASS */
 216                 + nla_total_size(addrlen * asoc->peer.transport_count)
 217                 + nla_total_size(addrlen * addrcnt)
 218                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 219                 + nla_total_size(sizeof(struct inet_diag_msg))
 220                 + 64;
 221 }
 222
 223 static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
 224 {
 225         struct sctp_association *assoc = tsp->asoc;
 226         struct sock *sk = tsp->asoc->base.sk;
 227         struct sctp_comm_param *commp = p;
 228         struct sk_buff *in_skb = commp->skb;
 229         const struct inet_diag_req_v2 *req = commp->r;
 230         const struct nlmsghdr *nlh = commp->nlh;
 231         struct net *net = sock_net(in_skb->sk);
 232         struct sk_buff *rep;
 233         int err;
 234
 235         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 236         if (err)
 237                 goto out;
 238
 239         err = -ENOMEM;
 240         rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
 241         if (!rep)
 242                 goto out;
 243
 244         lock_sock(sk);
 245         if (sk != assoc->base.sk) {
 246                 release_sock(sk);
 247                 sk = assoc->base.sk;
 248                 lock_sock(sk);
 249         }
 250         err = inet_sctp_diag_fill(sk, assoc, rep, req,
 251                                   sk_user_ns(NETLINK_CB(in_skb).sk),
 252                                   NETLINK_CB(in_skb).portid,
 253                                   nlh->nlmsg_seq, 0, nlh);
 254         release_sock(sk);
 255         if (err < 0) {
 256                 WARN_ON(err == -EMSGSIZE);
 257                 kfree_skb(rep);
 258                 goto out;
 259         }
 260
 261         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 262                               MSG_DONTWAIT);
 263         if (err > 0)
 264                 err = 0;
 265 out:
 266         return err;
 267 }
 268
 269 static int sctp_tsp_dump(struct sctp_transport *tsp, void *p)
 270 {
 271         struct sctp_endpoint *ep = tsp->asoc->ep;
 272         struct sctp_comm_param *commp = p;
 273         struct sock *sk = ep->base.sk;
 274         struct sk_buff *skb = commp->skb;
 275         struct netlink_callback *cb = commp->cb;
 276         const struct inet_diag_req_v2 *r = commp->r;
 277         struct sctp_association *assoc =
 278                 list_entry(ep->asocs.next, struct sctp_association, asocs);
 279         int err = 0;
 280
 281         /* find the ep only once through the transports by this condition */
 282         if (tsp->asoc != assoc)
 283                 goto out;
 284
 285         if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
 286                 goto out;
 287
 288         lock_sock(sk);
 289         if (sk != assoc->base.sk)
 290                 goto release;
 291         list_for_each_entry(assoc, &ep->asocs, asocs) {
 292                 if (cb->args[4] < cb->args[1])
 293                         goto next;
 294
 295                 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
 296                     r->id.idiag_sport)
 297                         goto next;
 298                 if (r->id.idiag_dport != htons(assoc->peer.port) &&
 299                     r->id.idiag_dport)
 300                         goto next;
 301
 302                 if (!cb->args[3] &&
 303                     inet_sctp_diag_fill(sk, NULL, skb, r,
 304                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 305                                         NETLINK_CB(cb->skb).portid,
 306                                         cb->nlh->nlmsg_seq,
 307                                         NLM_F_MULTI, cb->nlh) < 0) {
 308                         cb->args[3] = 1;
 309                         err = 2;
 310                         goto release;
 311                 }
 312                 cb->args[3] = 1;
 313
 314                 if (inet_sctp_diag_fill(sk, assoc, skb, r,
 315                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 316                                         NETLINK_CB(cb->skb).portid,
 317                                         cb->nlh->nlmsg_seq, 0, cb->nlh) < 0) {
 318                         err = 2;
 319                         goto release;
 320                 }
 321 next:
 322                 cb->args[4]++;
 323         }
 324         cb->args[1] = 0;
 325         cb->args[2]++;
 326         cb->args[3] = 0;
 327         cb->args[4] = 0;
 328 release:
 329         release_sock(sk);
 330         return err;
 331 out:
 332         cb->args[2]++;
 333         return err;
 334 }
 335
 336 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
 337 {
 338         struct sctp_comm_param *commp = p;
 339         struct sock *sk = ep->base.sk;
 340         struct sk_buff *skb = commp->skb;
 341         struct netlink_callback *cb = commp->cb;
 342         const struct inet_diag_req_v2 *r = commp->r;
 343         struct net *net = sock_net(skb->sk);
 344         struct inet_sock *inet = inet_sk(sk);
 345         int err = 0;
 346
 347         if (!net_eq(sock_net(sk), net))
 348                 goto out;
 349
 350         if (cb->args[4] < cb->args[1])
 351                 goto next;
 352
 353         if ((r->idiag_states & ~TCPF_LISTEN) && !list_empty(&ep->asocs))
 354                 goto next;
 355
 356         if (r->sdiag_family != AF_UNSPEC &&
 357             sk->sk_family != r->sdiag_family)
 358                 goto next;
 359
 360         if (r->id.idiag_sport != inet->inet_sport &&
 361             r->id.idiag_sport)
 362                 goto next;
 363
 364         if (r->id.idiag_dport != inet->inet_dport &&
 365             r->id.idiag_dport)
 366                 goto next;
 367
 368         if (inet_sctp_diag_fill(sk, NULL, skb, r,
 369                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
 370                                 NETLINK_CB(cb->skb).portid,
 371                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 372                                 cb->nlh) < 0) {
 373                 err = 2;
 374                 goto out;
 375         }
 376 next:
 377         cb->args[4]++;
 378 out:
 379         return err;
 380 }
 381
 382 /* define the functions for sctp_diag_handler*/
 383 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 384                                void *info)
 385 {
 386         struct sctp_infox *infox = (struct sctp_infox *)info;
 387
 388         if (infox->asoc) {
 389                 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
 390                 r->idiag_wqueue = infox->asoc->sndbuf_used;
 391         } else {
 392                 r->idiag_rqueue = sk->sk_ack_backlog;
 393                 r->idiag_wqueue = sk->sk_max_ack_backlog;
 394         }
 395         if (infox->sctpinfo)
 396                 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
 397 }
 398
 399 static int sctp_diag_dump_one(struct sk_buff *in_skb,
 400                               const struct nlmsghdr *nlh,
 401                               const struct inet_diag_req_v2 *req)
 402 {
 403         struct net *net = sock_net(in_skb->sk);
 404         union sctp_addr laddr, paddr;
 405         struct sctp_comm_param commp = {
 406                 .skb = in_skb,
 407                 .r = req,
 408                 .nlh = nlh,
 409         };
 410
 411         if (req->sdiag_family == AF_INET) {
 412                 laddr.v4.sin_port = req->id.idiag_sport;
 413                 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
 414                 laddr.v4.sin_family = AF_INET;
 415
 416                 paddr.v4.sin_port = req->id.idiag_dport;
 417                 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
 418                 paddr.v4.sin_family = AF_INET;
 419         } else {
 420                 laddr.v6.sin6_port = req->id.idiag_sport;
 421                 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src, 64);
 422                 laddr.v6.sin6_family = AF_INET6;
 423
 424                 paddr.v6.sin6_port = req->id.idiag_dport;
 425                 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, 64);
 426                 paddr.v6.sin6_family = AF_INET6;
 427         }
 428
 429         return sctp_transport_lookup_process(sctp_tsp_dump_one,
 430                                              net, &laddr, &paddr, &commp);
 431 }
 432
 433 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 434                            const struct inet_diag_req_v2 *r, struct nlattr *bc)
 435 {
 436         u32 idiag_states = r->idiag_states;
 437         struct net *net = sock_net(skb->sk);
 438         struct sctp_comm_param commp = {
 439                 .skb = skb,
 440                 .cb = cb,
 441                 .r = r,
 442         };
 443
 444         /* eps hashtable dumps
 445          * args:
 446          * 0 : if it will traversal listen sock
 447          * 1 : to record the sock pos of this time's traversal
 448          * 4 : to work as a temporary variable to traversal list
 449          */
 450         if (cb->args[0] == 0) {
 451                 if (!(idiag_states & TCPF_LISTEN))
 452                         goto skip;
 453                 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
 454                         goto done;
 455 skip:
 456                 cb->args[0] = 1;
 457                 cb->args[1] = 0;
 458                 cb->args[4] = 0;
 459         }
 460
 461         /* asocs by transport hashtable dump
 462          * args:
 463          * 1 : to record the assoc pos of this time's traversal
 464          * 2 : to record the transport pos of this time's traversal
 465          * 3 : to mark if we have dumped the ep info of the current asoc
 466          * 4 : to work as a temporary variable to traversal list
 467          */
 468         if (!(idiag_states & ~TCPF_LISTEN))
 469                 goto done;
 470         sctp_for_each_transport(sctp_tsp_dump, net, cb->args[2], &commp);
 471 done:
 472         cb->args[1] = cb->args[4];
 473         cb->args[4] = 0;
 474 }
 475
 476 static const struct inet_diag_handler sctp_diag_handler = {
 477         .dump            = sctp_diag_dump,
 478         .dump_one        = sctp_diag_dump_one,
 479         .idiag_get_info  = sctp_diag_get_info,
 480         .idiag_type      = IPPROTO_SCTP,
 481         .idiag_info_size = sizeof(struct sctp_info),
 482 };
 483
 484 static int __init sctp_diag_init(void)
 485 {
 486         return inet_diag_register(&sctp_diag_handler);
 487 }
 488
 489 static void __exit sctp_diag_exit(void)
 490 {
 491         inet_diag_unregister(&sctp_diag_handler);
 492 }
 493
 494 module_init(sctp_diag_init);
 495 module_exit(sctp_diag_exit);
 496 MODULE_LICENSE("GPL");
 497 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);