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 {
 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                 if (asoc && asoc->ep->rcvbuf_policy)
 149                         amt = atomic_read(&asoc->rmem_alloc);
 150                 else
 151                         amt = sk_rmem_alloc_get(sk);
 152                 mem[SK_MEMINFO_RMEM_ALLOC] = amt;
 153                 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
 154                 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
 155                 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
 156                 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
 157                 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
 158                 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len;
 159                 mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
 160
 161                 if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
 162                         goto errout;
 163         }
 164
 165         if (ext & (1 << (INET_DIAG_INFO - 1))) {
 166                 struct nlattr *attr;
 167
 168                 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
 169                                          sizeof(struct sctp_info),
 170                                          INET_DIAG_PAD);
 171                 if (!attr)
 172                         goto errout;
 173
 174                 info = nla_data(attr);
 175         }
 176         infox.sctpinfo = (struct sctp_info *)info;
 177         infox.asoc = asoc;
 178         sctp_diag_get_info(sk, r, &infox);
 179
 180         addr_list = asoc ? &asoc->base.bind_addr.address_list
 181                          : &ep->base.bind_addr.address_list;
 182         if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
 183                 goto errout;
 184
 185         if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
 186                 if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
 187                         goto errout;
 188
 189         if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
 190                 goto errout;
 191
 192         nlmsg_end(skb, nlh);
 193         return 0;
 194
 195 errout:
 196         nlmsg_cancel(skb, nlh);
 197         return -EMSGSIZE;
 198 }
 199
 200 /* callback and param */
 201 struct sctp_comm_param {
 202         struct sk_buff *skb;
 203         struct netlink_callback *cb;
 204         const struct inet_diag_req_v2 *r;
 205         const struct nlmsghdr *nlh;
 206 };
 207
 208 static size_t inet_assoc_attr_size(struct sctp_association *asoc)
 209 {
 210         int addrlen = sizeof(struct sockaddr_storage);
 211         int addrcnt = 0;
 212         struct sctp_sockaddr_entry *laddr;
 213
 214         list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
 215                                 list)
 216                 addrcnt++;
 217
 218         return    nla_total_size(sizeof(struct sctp_info))
 219                 + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
 220                 + nla_total_size(1) /* INET_DIAG_TOS */
 221                 + nla_total_size(1) /* INET_DIAG_TCLASS */
 222                 + nla_total_size(addrlen * asoc->peer.transport_count)
 223                 + nla_total_size(addrlen * addrcnt)
 224                 + nla_total_size(sizeof(struct inet_diag_meminfo))
 225                 + nla_total_size(sizeof(struct inet_diag_msg))
 226                 + 64;
 227 }
 228
 229 static int sctp_tsp_dump_one(struct sctp_transport *tsp, void *p)
 230 {
 231         struct sctp_association *assoc = tsp->asoc;
 232         struct sock *sk = tsp->asoc->base.sk;
 233         struct sctp_comm_param *commp = p;
 234         struct sk_buff *in_skb = commp->skb;
 235         const struct inet_diag_req_v2 *req = commp->r;
 236         const struct nlmsghdr *nlh = commp->nlh;
 237         struct net *net = sock_net(in_skb->sk);
 238         struct sk_buff *rep;
 239         int err;
 240
 241         err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
 242         if (err)
 243                 goto out;
 244
 245         err = -ENOMEM;
 246         rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
 247         if (!rep)
 248                 goto out;
 249
 250         lock_sock(sk);
 251         if (sk != assoc->base.sk) {
 252                 release_sock(sk);
 253                 sk = assoc->base.sk;
 254                 lock_sock(sk);
 255         }
 256         err = inet_sctp_diag_fill(sk, assoc, rep, req,
 257                                   sk_user_ns(NETLINK_CB(in_skb).sk),
 258                                   NETLINK_CB(in_skb).portid,
 259                                   nlh->nlmsg_seq, 0, nlh);
 260         release_sock(sk);
 261         if (err < 0) {
 262                 WARN_ON(err == -EMSGSIZE);
 263                 kfree_skb(rep);
 264                 goto out;
 265         }
 266
 267         err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
 268                               MSG_DONTWAIT);
 269         if (err > 0)
 270                 err = 0;
 271 out:
 272         return err;
 273 }
 274
 275 static int sctp_tsp_dump(struct sctp_transport *tsp, void *p)
 276 {
 277         struct sctp_endpoint *ep = tsp->asoc->ep;
 278         struct sctp_comm_param *commp = p;
 279         struct sock *sk = ep->base.sk;
 280         struct sk_buff *skb = commp->skb;
 281         struct netlink_callback *cb = commp->cb;
 282         const struct inet_diag_req_v2 *r = commp->r;
 283         struct sctp_association *assoc =
 284                 list_entry(ep->asocs.next, struct sctp_association, asocs);
 285         int err = 0;
 286
 287         /* find the ep only once through the transports by this condition */
 288         if (tsp->asoc != assoc)
 289                 goto out;
 290
 291         if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
 292                 goto out;
 293
 294         lock_sock(sk);
 295         if (sk != assoc->base.sk)
 296                 goto release;
 297         list_for_each_entry(assoc, &ep->asocs, asocs) {
 298                 if (cb->args[4] < cb->args[1])
 299                         goto next;
 300
 301                 if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
 302                     r->id.idiag_sport)
 303                         goto next;
 304                 if (r->id.idiag_dport != htons(assoc->peer.port) &&
 305                     r->id.idiag_dport)
 306                         goto next;
 307
 308                 if (!cb->args[3] &&
 309                     inet_sctp_diag_fill(sk, NULL, skb, r,
 310                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 311                                         NETLINK_CB(cb->skb).portid,
 312                                         cb->nlh->nlmsg_seq,
 313                                         NLM_F_MULTI, cb->nlh) < 0) {
 314                         cb->args[3] = 1;
 315                         err = 2;
 316                         goto release;
 317                 }
 318                 cb->args[3] = 1;
 319
 320                 if (inet_sctp_diag_fill(sk, assoc, skb, r,
 321                                         sk_user_ns(NETLINK_CB(cb->skb).sk),
 322                                         NETLINK_CB(cb->skb).portid,
 323                                         cb->nlh->nlmsg_seq, 0, cb->nlh) < 0) {
 324                         err = 2;
 325                         goto release;
 326                 }
 327 next:
 328                 cb->args[4]++;
 329         }
 330         cb->args[1] = 0;
 331         cb->args[2]++;
 332         cb->args[3] = 0;
 333         cb->args[4] = 0;
 334 release:
 335         release_sock(sk);
 336         return err;
 337 out:
 338         cb->args[2]++;
 339         return err;
 340 }
 341
 342 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
 343 {
 344         struct sctp_comm_param *commp = p;
 345         struct sock *sk = ep->base.sk;
 346         struct sk_buff *skb = commp->skb;
 347         struct netlink_callback *cb = commp->cb;
 348         const struct inet_diag_req_v2 *r = commp->r;
 349         struct net *net = sock_net(skb->sk);
 350         struct inet_sock *inet = inet_sk(sk);
 351         int err = 0;
 352
 353         if (!net_eq(sock_net(sk), net))
 354                 goto out;
 355
 356         if (cb->args[4] < cb->args[1])
 357                 goto next;
 358
 359         if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
 360                 goto next;
 361
 362         if (r->sdiag_family != AF_UNSPEC &&
 363             sk->sk_family != r->sdiag_family)
 364                 goto next;
 365
 366         if (r->id.idiag_sport != inet->inet_sport &&
 367             r->id.idiag_sport)
 368                 goto next;
 369
 370         if (r->id.idiag_dport != inet->inet_dport &&
 371             r->id.idiag_dport)
 372                 goto next;
 373
 374         if (inet_sctp_diag_fill(sk, NULL, skb, r,
 375                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
 376                                 NETLINK_CB(cb->skb).portid,
 377                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 378                                 cb->nlh) < 0) {
 379                 err = 2;
 380                 goto out;
 381         }
 382 next:
 383         cb->args[4]++;
 384 out:
 385         return err;
 386 }
 387
 388 /* define the functions for sctp_diag_handler*/
 389 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 390                                void *info)
 391 {
 392         struct sctp_infox *infox = (struct sctp_infox *)info;
 393
 394         if (infox->asoc) {
 395                 r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
 396                 r->idiag_wqueue = infox->asoc->sndbuf_used;
 397         } else {
 398                 r->idiag_rqueue = sk->sk_ack_backlog;
 399                 r->idiag_wqueue = sk->sk_max_ack_backlog;
 400         }
 401         if (infox->sctpinfo)
 402                 sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
 403 }
 404
 405 static int sctp_diag_dump_one(struct sk_buff *in_skb,
 406                               const struct nlmsghdr *nlh,
 407                               const struct inet_diag_req_v2 *req)
 408 {
 409         struct net *net = sock_net(in_skb->sk);
 410         union sctp_addr laddr, paddr;
 411         struct sctp_comm_param commp = {
 412                 .skb = in_skb,
 413                 .r = req,
 414                 .nlh = nlh,
 415         };
 416
 417         if (req->sdiag_family == AF_INET) {
 418                 laddr.v4.sin_port = req->id.idiag_sport;
 419                 laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
 420                 laddr.v4.sin_family = AF_INET;
 421
 422                 paddr.v4.sin_port = req->id.idiag_dport;
 423                 paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
 424                 paddr.v4.sin_family = AF_INET;
 425         } else {
 426                 laddr.v6.sin6_port = req->id.idiag_sport;
 427                 memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
 428                        sizeof(laddr.v6.sin6_addr));
 429                 laddr.v6.sin6_family = AF_INET6;
 430
 431                 paddr.v6.sin6_port = req->id.idiag_dport;
 432                 memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
 433                        sizeof(paddr.v6.sin6_addr));
 434                 paddr.v6.sin6_family = AF_INET6;
 435         }
 436
 437         return sctp_transport_lookup_process(sctp_tsp_dump_one,
 438                                              net, &laddr, &paddr, &commp);
 439 }
 440
 441 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 442                            const struct inet_diag_req_v2 *r, struct nlattr *bc)
 443 {
 444         u32 idiag_states = r->idiag_states;
 445         struct net *net = sock_net(skb->sk);
 446         struct sctp_comm_param commp = {
 447                 .skb = skb,
 448                 .cb = cb,
 449                 .r = r,
 450         };
 451
 452         /* eps hashtable dumps
 453          * args:
 454          * 0 : if it will traversal listen sock
 455          * 1 : to record the sock pos of this time's traversal
 456          * 4 : to work as a temporary variable to traversal list
 457          */
 458         if (cb->args[0] == 0) {
 459                 if (!(idiag_states & TCPF_LISTEN))
 460                         goto skip;
 461                 if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
 462                         goto done;
 463 skip:
 464                 cb->args[0] = 1;
 465                 cb->args[1] = 0;
 466                 cb->args[4] = 0;
 467         }
 468
 469         /* asocs by transport hashtable dump
 470          * args:
 471          * 1 : to record the assoc pos of this time's traversal
 472          * 2 : to record the transport pos of this time's traversal
 473          * 3 : to mark if we have dumped the ep info of the current asoc
 474          * 4 : to work as a temporary variable to traversal list
 475          */
 476         if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
 477                 goto done;
 478         sctp_for_each_transport(sctp_tsp_dump, net, cb->args[2], &commp);
 479 done:
 480         cb->args[1] = cb->args[4];
 481         cb->args[4] = 0;
 482 }
 483
 484 static const struct inet_diag_handler sctp_diag_handler = {
 485         .dump            = sctp_diag_dump,
 486         .dump_one        = sctp_diag_dump_one,
 487         .idiag_get_info  = sctp_diag_get_info,
 488         .idiag_type      = IPPROTO_SCTP,
 489         .idiag_info_size = sizeof(struct sctp_info),
 490 };
 491
 492 static int __init sctp_diag_init(void)
 493 {
 494         return inet_diag_register(&sctp_diag_handler);
 495 }
 496
 497 static void __exit sctp_diag_exit(void)
 498 {
 499         inet_diag_unregister(&sctp_diag_handler);
 500 }
 501
 502 module_init(sctp_diag_init);
 503 module_exit(sctp_diag_exit);
 504 MODULE_LICENSE("GPL");
 505 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);