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_64bit(skb, INET_DIAG_INFO,
 165                                          sizeof(struct sctp_info),
 166                                          INET_DIAG_PAD);
 167                 if (!attr)
 168                         goto errout;
 169
 170                 info = nla_data(attr);
 171         }
 172         infox.sctpinfo = (struct sctp_info *)info;
 173         infox.asoc = asoc;
 174         sctp_diag_get_info(sk, r, &infox);
 175
 176         addr_list = asoc ? &asoc->base.bind_addr.address_list
 177                          : &ep->base.bind_addr.address_list;
 178         if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
 179                 goto errout;
 180
 181         if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
 182                 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
 183                         goto errout;
 184
 185         if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
 186                 goto errout;
 187
 188         nlmsg_end(skb, nlh);
 189         return 0;
 190
 191 errout:
 192         nlmsg_cancel(skb, nlh);
 193         return -EMSGSIZE;
 194 }
 195
 196 /* callback and param */
 197 struct sctp_comm_param {
 198         struct sk_buff *skb;
 199         struct netlink_callback *cb;
 200         const struct inet_diag_req_v2 *r;
 201         const struct nlmsghdr *nlh;
 202 };
 203
 204 static size_t inet_assoc_attr_size(struct sctp_association *asoc)
 205 {
 206         int addrlen = sizeof(struct sockaddr_storage);
 207         int addrcnt = 0;
 208         struct sctp_sockaddr_entry *laddr;
 209
 210         list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
 211                                 list)
 212                 addrcnt++;
 213
 214         return    nla_total_size(sizeof(struct sctp_info))
 215                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
 216                 + nla_total_size(1) /* INET_DIAG_TOS */
 217                 + nla_total_size(1) /* INET_DIAG_TCLASS */
 218                 + nla_total_size(addrlen * asoc->peer.transport_count)
 219                 + nla_total_size(addrlen * addrcnt)
 220                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 221                 + nla_total_size(sizeof(struct inet_diag_msg))
 222                 + 64;
 223 }
 224
 225 static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
 226 {
 227         struct sctp_association *assoc = tsp->asoc;
 228         struct sock *sk = tsp->asoc->base.sk;
 229         struct sctp_comm_param *commp = p;
 230         struct sk_buff *in_skb = commp->skb;
 231         const struct inet_diag_req_v2 *req = commp->r;
 232         const struct nlmsghdr *nlh = commp->nlh;
 233         struct net *net = sock_net(in_skb->sk);
 234         struct sk_buff *rep;
 235         int err;
 236
 237         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 238         if (err)
 239                 goto out;
 240
 241         err = -ENOMEM;
 242         rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
 243         if (!rep)
 244                 goto out;
 245
 246         lock_sock(sk);
 247         if (sk != assoc->base.sk) {
 248                 release_sock(sk);
 249                 sk = assoc->base.sk;
 250                 lock_sock(sk);
 251         }
 252         err = inet_sctp_diag_fill(sk, assoc, rep, req,
 253                                   sk_user_ns(NETLINK_CB(in_skb).sk),
 254                                   NETLINK_CB(in_skb).portid,
 255                                   nlh->nlmsg_seq, 0, nlh);
 256         release_sock(sk);
 257         if (err < 0) {
 258                 WARN_ON(err == -EMSGSIZE);
 259                 kfree_skb(rep);
 260                 goto out;
 261         }
 262
 263         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 264                               MSG_DONTWAIT);
 265         if (err > 0)
 266                 err = 0;
 267 out:
 268         return err;
 269 }
 270
 271 static int sctp_tsp_dump(struct sctp_transport *tsp, void *p)
 272 {
 273         struct sctp_endpoint *ep = tsp->asoc->ep;
 274         struct sctp_comm_param *commp = p;
 275         struct sock *sk = ep->base.sk;
 276         struct sk_buff *skb = commp->skb;
 277         struct netlink_callback *cb = commp->cb;
 278         const struct inet_diag_req_v2 *r = commp->r;
 279         struct sctp_association *assoc =
 280                 list_entry(ep->asocs.next, struct sctp_association, asocs);
 281         int err = 0;
 282
 283         /* find the ep only once through the transports by this condition */
 284         if (tsp->asoc != assoc)
 285                 goto out;
 286
 287         if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
 288                 goto out;
 289
 290         lock_sock(sk);
 291         if (sk != assoc->base.sk)
 292                 goto release;
 293         list_for_each_entry(assoc, &ep->asocs, asocs) {
 294                 if (cb->args[4] < cb->args[1])
 295                         goto next;
 296
 297                 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
 298                     r->id.idiag_sport)
 299                         goto next;
 300                 if (r->id.idiag_dport != htons(assoc->peer.port) &&
 301                     r->id.idiag_dport)
 302                         goto next;
 303
 304                 if (!cb->args[3] &&
 305                     inet_sctp_diag_fill(sk, NULL, skb, r,
 306                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 307                                         NETLINK_CB(cb->skb).portid,
 308                                         cb->nlh->nlmsg_seq,
 309                                         NLM_F_MULTI, cb->nlh) < 0) {
 310                         cb->args[3] = 1;
 311                         err = 2;
 312                         goto release;
 313                 }
 314                 cb->args[3] = 1;
 315
 316                 if (inet_sctp_diag_fill(sk, assoc, skb, r,
 317                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 318                                         NETLINK_CB(cb->skb).portid,
 319                                         cb->nlh->nlmsg_seq, 0, cb->nlh) < 0) {
 320                         err = 2;
 321                         goto release;
 322                 }
 323 next:
 324                 cb->args[4]++;
 325         }
 326         cb->args[1] = 0;
 327         cb->args[2]++;
 328         cb->args[3] = 0;
 329         cb->args[4] = 0;
 330 release:
 331         release_sock(sk);
 332         return err;
 333 out:
 334         cb->args[2]++;
 335         return err;
 336 }
 337
 338 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
 339 {
 340         struct sctp_comm_param *commp = p;
 341         struct sock *sk = ep->base.sk;
 342         struct sk_buff *skb = commp->skb;
 343         struct netlink_callback *cb = commp->cb;
 344         const struct inet_diag_req_v2 *r = commp->r;
 345         struct net *net = sock_net(skb->sk);
 346         struct inet_sock *inet = inet_sk(sk);
 347         int err = 0;
 348
 349         if (!net_eq(sock_net(sk), net))
 350                 goto out;
 351
 352         if (cb->args[4] < cb->args[1])
 353                 goto next;
 354
 355         if (r->sdiag_family != AF_UNSPEC &&
 356             sk->sk_family != r->sdiag_family)
 357                 goto next;
 358
 359         if (r->id.idiag_sport != inet->inet_sport &&
 360             r->id.idiag_sport)
 361                 goto next;
 362
 363         if (r->id.idiag_dport != inet->inet_dport &&
 364             r->id.idiag_dport)
 365                 goto next;
 366
 367         if (inet_sctp_diag_fill(sk, NULL, skb, r,
 368                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
 369                                 NETLINK_CB(cb->skb).portid,
 370                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 371                                 cb->nlh) < 0) {
 372                 err = 2;
 373                 goto out;
 374         }
 375 next:
 376         cb->args[4]++;
 377 out:
 378         return err;
 379 }
 380
 381 /* define the functions for sctp_diag_handler*/
 382 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 383                                void *info)
 384 {
 385         struct sctp_infox *infox = (struct sctp_infox *)info;
 386
 387         if (infox->asoc) {
 388                 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
 389                 r->idiag_wqueue = infox->asoc->sndbuf_used;
 390         } else {
 391                 r->idiag_rqueue = sk->sk_ack_backlog;
 392                 r->idiag_wqueue = sk->sk_max_ack_backlog;
 393         }
 394         if (infox->sctpinfo)
 395                 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
 396 }
 397
 398 static int sctp_diag_dump_one(struct sk_buff *in_skb,
 399                               const struct nlmsghdr *nlh,
 400                               const struct inet_diag_req_v2 *req)
 401 {
 402         struct net *net = sock_net(in_skb->sk);
 403         union sctp_addr laddr, paddr;
 404         struct sctp_comm_param commp = {
 405                 .skb = in_skb,
 406                 .r = req,
 407                 .nlh = nlh,
 408         };
 409
 410         if (req->sdiag_family == AF_INET) {
 411                 laddr.v4.sin_port = req->id.idiag_sport;
 412                 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
 413                 laddr.v4.sin_family = AF_INET;
 414
 415                 paddr.v4.sin_port = req->id.idiag_dport;
 416                 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
 417                 paddr.v4.sin_family = AF_INET;
 418         } else {
 419                 laddr.v6.sin6_port = req->id.idiag_sport;
 420                 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src, 64);
 421                 laddr.v6.sin6_family = AF_INET6;
 422
 423                 paddr.v6.sin6_port = req->id.idiag_dport;
 424                 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, 64);
 425                 paddr.v6.sin6_family = AF_INET6;
 426         }
 427
 428         return sctp_transport_lookup_process(sctp_tsp_dump_one,
 429                                              net, &laddr, &paddr, &commp);
 430 }
 431
 432 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 433                            const struct inet_diag_req_v2 *r, struct nlattr *bc)
 434 {
 435         u32 idiag_states = r->idiag_states;
 436         struct net *net = sock_net(skb->sk);
 437         struct sctp_comm_param commp = {
 438                 .skb = skb,
 439                 .cb = cb,
 440                 .r = r,
 441         };
 442
 443         /* eps hashtable dumps
 444          * args:
 445          * 0 : if it will traversal listen sock
 446          * 1 : to record the sock pos of this time's traversal
 447          * 4 : to work as a temporary variable to traversal list
 448          */
 449         if (cb->args[0] == 0) {
 450                 if (!(idiag_states & TCPF_LISTEN))
 451                         goto skip;
 452                 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
 453                         goto done;
 454 skip:
 455                 cb->args[0] = 1;
 456                 cb->args[1] = 0;
 457                 cb->args[4] = 0;
 458         }
 459
 460         /* asocs by transport hashtable dump
 461          * args:
 462          * 1 : to record the assoc pos of this time's traversal
 463          * 2 : to record the transport pos of this time's traversal
 464          * 3 : to mark if we have dumped the ep info of the current asoc
 465          * 4 : to work as a temporary variable to traversal list
 466          */
 467         if (!(idiag_states & ~TCPF_LISTEN))
 468                 goto done;
 469         sctp_for_each_transport(sctp_tsp_dump, net, cb->args[2], &commp);
 470 done:
 471         cb->args[1] = cb->args[4];
 472         cb->args[4] = 0;
 473 }
 474
 475 static const struct inet_diag_handler sctp_diag_handler = {
 476         .dump            = sctp_diag_dump,
 477         .dump_one        = sctp_diag_dump_one,
 478         .idiag_get_info  = sctp_diag_get_info,
 479         .idiag_type      = IPPROTO_SCTP,
 480         .idiag_info_size = sizeof(struct sctp_info),
 481 };
 482
 483 static int __init sctp_diag_init(void)
 484 {
 485         return inet_diag_register(&sctp_diag_handler);
 486 }
 487
 488 static void __exit sctp_diag_exit(void)
 489 {
 490         inet_diag_unregister(&sctp_diag_handler);
 491 }
 492
 493 module_init(sctp_diag_init);
 494 module_exit(sctp_diag_exit);
 495 MODULE_LICENSE("GPL");
 496 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);