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0001 // SPDX-License-Identifier: GPL-2.0-or-later
0002 /* SCTP kernel implementation
0003  * (C) Copyright Red Hat Inc. 2017
0004  *
0005  * This file is part of the SCTP kernel implementation
0006  *
0007  * These functions implement sctp diag support.
0008  *
0009  * Please send any bug reports or fixes you make to the
0010  * email addresched(es):
0011  *    lksctp developers <linux-sctp@vger.kernel.org>
0012  *
0013  * Written or modified by:
0014  *    Xin Long <lucien.xin@gmail.com>
0015  */
0016 
0017 #include <linux/module.h>
0018 #include <linux/inet_diag.h>
0019 #include <linux/sock_diag.h>
0020 #include <net/sctp/sctp.h>
0021 
0022 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
0023                    void *info);
0024 
0025 /* define some functions to make asoc/ep fill look clean */
0026 static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r,
0027                     struct sock *sk,
0028                     struct sctp_association *asoc)
0029 {
0030     union sctp_addr laddr, paddr;
0031     struct dst_entry *dst;
0032     struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer;
0033 
0034     laddr = list_entry(asoc->base.bind_addr.address_list.next,
0035                struct sctp_sockaddr_entry, list)->a;
0036     paddr = asoc->peer.primary_path->ipaddr;
0037     dst = asoc->peer.primary_path->dst;
0038 
0039     r->idiag_family = sk->sk_family;
0040     r->id.idiag_sport = htons(asoc->base.bind_addr.port);
0041     r->id.idiag_dport = htons(asoc->peer.port);
0042     r->id.idiag_if = dst ? dst->dev->ifindex : 0;
0043     sock_diag_save_cookie(sk, r->id.idiag_cookie);
0044 
0045 #if IS_ENABLED(CONFIG_IPV6)
0046     if (sk->sk_family == AF_INET6) {
0047         *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr;
0048         *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr;
0049     } else
0050 #endif
0051     {
0052         memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
0053         memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
0054 
0055         r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr;
0056         r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr;
0057     }
0058 
0059     r->idiag_state = asoc->state;
0060     if (timer_pending(t3_rtx)) {
0061         r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX;
0062         r->idiag_retrans = asoc->rtx_data_chunks;
0063         r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies);
0064     }
0065 }
0066 
0067 static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb,
0068                      struct list_head *address_list)
0069 {
0070     struct sctp_sockaddr_entry *laddr;
0071     int addrlen = sizeof(struct sockaddr_storage);
0072     int addrcnt = 0;
0073     struct nlattr *attr;
0074     void *info = NULL;
0075 
0076     list_for_each_entry_rcu(laddr, address_list, list)
0077         addrcnt++;
0078 
0079     attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt);
0080     if (!attr)
0081         return -EMSGSIZE;
0082 
0083     info = nla_data(attr);
0084     list_for_each_entry_rcu(laddr, address_list, list) {
0085         memcpy(info, &laddr->a, sizeof(laddr->a));
0086         memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a));
0087         info += addrlen;
0088     }
0089 
0090     return 0;
0091 }
0092 
0093 static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb,
0094                     struct sctp_association *asoc)
0095 {
0096     int addrlen = sizeof(struct sockaddr_storage);
0097     struct sctp_transport *from;
0098     struct nlattr *attr;
0099     void *info = NULL;
0100 
0101     attr = nla_reserve(skb, INET_DIAG_PEERS,
0102                addrlen * asoc->peer.transport_count);
0103     if (!attr)
0104         return -EMSGSIZE;
0105 
0106     info = nla_data(attr);
0107     list_for_each_entry(from, &asoc->peer.transport_addr_list,
0108                 transports) {
0109         memcpy(info, &from->ipaddr, sizeof(from->ipaddr));
0110         memset(info + sizeof(from->ipaddr), 0,
0111                addrlen - sizeof(from->ipaddr));
0112         info += addrlen;
0113     }
0114 
0115     return 0;
0116 }
0117 
0118 /* sctp asoc/ep fill*/
0119 static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc,
0120                    struct sk_buff *skb,
0121                    const struct inet_diag_req_v2 *req,
0122                    struct user_namespace *user_ns,
0123                    int portid, u32 seq, u16 nlmsg_flags,
0124                    const struct nlmsghdr *unlh,
0125                    bool net_admin)
0126 {
0127     struct sctp_endpoint *ep = sctp_sk(sk)->ep;
0128     struct list_head *addr_list;
0129     struct inet_diag_msg *r;
0130     struct nlmsghdr  *nlh;
0131     int ext = req->idiag_ext;
0132     struct sctp_infox infox;
0133     void *info = NULL;
0134 
0135     nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
0136             nlmsg_flags);
0137     if (!nlh)
0138         return -EMSGSIZE;
0139 
0140     r = nlmsg_data(nlh);
0141     BUG_ON(!sk_fullsock(sk));
0142 
0143     r->idiag_timer = 0;
0144     r->idiag_retrans = 0;
0145     r->idiag_expires = 0;
0146     if (asoc) {
0147         inet_diag_msg_sctpasoc_fill(r, sk, asoc);
0148     } else {
0149         inet_diag_msg_common_fill(r, sk);
0150         r->idiag_state = sk->sk_state;
0151     }
0152 
0153     if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
0154         goto errout;
0155 
0156     if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) {
0157         u32 mem[SK_MEMINFO_VARS];
0158         int amt;
0159 
0160         if (asoc && asoc->ep->sndbuf_policy)
0161             amt = asoc->sndbuf_used;
0162         else
0163             amt = sk_wmem_alloc_get(sk);
0164         mem[SK_MEMINFO_WMEM_ALLOC] = amt;
0165         if (asoc && asoc->ep->rcvbuf_policy)
0166             amt = atomic_read(&asoc->rmem_alloc);
0167         else
0168             amt = sk_rmem_alloc_get(sk);
0169         mem[SK_MEMINFO_RMEM_ALLOC] = amt;
0170         mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf;
0171         mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf;
0172         mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc;
0173         mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued;
0174         mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc);
0175         mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len);
0176         mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops);
0177 
0178         if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0)
0179             goto errout;
0180     }
0181 
0182     if (ext & (1 << (INET_DIAG_INFO - 1))) {
0183         struct nlattr *attr;
0184 
0185         attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
0186                      sizeof(struct sctp_info),
0187                      INET_DIAG_PAD);
0188         if (!attr)
0189             goto errout;
0190 
0191         info = nla_data(attr);
0192     }
0193     infox.sctpinfo = (struct sctp_info *)info;
0194     infox.asoc = asoc;
0195     sctp_diag_get_info(sk, r, &infox);
0196 
0197     addr_list = asoc ? &asoc->base.bind_addr.address_list
0198              : &ep->base.bind_addr.address_list;
0199     if (inet_diag_msg_sctpladdrs_fill(skb, addr_list))
0200         goto errout;
0201 
0202     if (asoc && (ext & (1 << (INET_DIAG_CONG - 1))))
0203         if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0)
0204             goto errout;
0205 
0206     if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc))
0207         goto errout;
0208 
0209     nlmsg_end(skb, nlh);
0210     return 0;
0211 
0212 errout:
0213     nlmsg_cancel(skb, nlh);
0214     return -EMSGSIZE;
0215 }
0216 
0217 /* callback and param */
0218 struct sctp_comm_param {
0219     struct sk_buff *skb;
0220     struct netlink_callback *cb;
0221     const struct inet_diag_req_v2 *r;
0222     const struct nlmsghdr *nlh;
0223     bool net_admin;
0224 };
0225 
0226 static size_t inet_assoc_attr_size(struct sctp_association *asoc)
0227 {
0228     int addrlen = sizeof(struct sockaddr_storage);
0229     int addrcnt = 0;
0230     struct sctp_sockaddr_entry *laddr;
0231 
0232     list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list,
0233                 list)
0234         addrcnt++;
0235 
0236     return    nla_total_size(sizeof(struct sctp_info))
0237         + nla_total_size(addrlen * asoc->peer.transport_count)
0238         + nla_total_size(addrlen * addrcnt)
0239         + nla_total_size(sizeof(struct inet_diag_msg))
0240         + inet_diag_msg_attrs_size()
0241         + nla_total_size(sizeof(struct inet_diag_meminfo))
0242         + 64;
0243 }
0244 
0245 static int sctp_sock_dump_one(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
0246 {
0247     struct sctp_association *assoc = tsp->asoc;
0248     struct sctp_comm_param *commp = p;
0249     struct sock *sk = ep->base.sk;
0250     const struct inet_diag_req_v2 *req = commp->r;
0251     struct sk_buff *skb = commp->skb;
0252     struct sk_buff *rep;
0253     int err;
0254 
0255     err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
0256     if (err)
0257         return err;
0258 
0259     rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL);
0260     if (!rep)
0261         return -ENOMEM;
0262 
0263     lock_sock(sk);
0264     if (ep != assoc->ep) {
0265         err = -EAGAIN;
0266         goto out;
0267     }
0268 
0269     err = inet_sctp_diag_fill(sk, assoc, rep, req, sk_user_ns(NETLINK_CB(skb).sk),
0270                   NETLINK_CB(skb).portid, commp->nlh->nlmsg_seq, 0,
0271                   commp->nlh, commp->net_admin);
0272     if (err < 0) {
0273         WARN_ON(err == -EMSGSIZE);
0274         goto out;
0275     }
0276     release_sock(sk);
0277 
0278     return nlmsg_unicast(sock_net(skb->sk)->diag_nlsk, rep, NETLINK_CB(skb).portid);
0279 
0280 out:
0281     release_sock(sk);
0282     kfree_skb(rep);
0283     return err;
0284 }
0285 
0286 static int sctp_sock_dump(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
0287 {
0288     struct sctp_comm_param *commp = p;
0289     struct sock *sk = ep->base.sk;
0290     struct sk_buff *skb = commp->skb;
0291     struct netlink_callback *cb = commp->cb;
0292     const struct inet_diag_req_v2 *r = commp->r;
0293     struct sctp_association *assoc;
0294     int err = 0;
0295 
0296     lock_sock(sk);
0297     if (ep != tsp->asoc->ep)
0298         goto release;
0299     list_for_each_entry(assoc, &ep->asocs, asocs) {
0300         if (cb->args[4] < cb->args[1])
0301             goto next;
0302 
0303         if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) &&
0304             r->id.idiag_sport)
0305             goto next;
0306         if (r->id.idiag_dport != htons(assoc->peer.port) &&
0307             r->id.idiag_dport)
0308             goto next;
0309 
0310         if (!cb->args[3] &&
0311             inet_sctp_diag_fill(sk, NULL, skb, r,
0312                     sk_user_ns(NETLINK_CB(cb->skb).sk),
0313                     NETLINK_CB(cb->skb).portid,
0314                     cb->nlh->nlmsg_seq,
0315                     NLM_F_MULTI, cb->nlh,
0316                     commp->net_admin) < 0) {
0317             err = 1;
0318             goto release;
0319         }
0320         cb->args[3] = 1;
0321 
0322         if (inet_sctp_diag_fill(sk, assoc, skb, r,
0323                     sk_user_ns(NETLINK_CB(cb->skb).sk),
0324                     NETLINK_CB(cb->skb).portid,
0325                     cb->nlh->nlmsg_seq, 0, cb->nlh,
0326                     commp->net_admin) < 0) {
0327             err = 1;
0328             goto release;
0329         }
0330 next:
0331         cb->args[4]++;
0332     }
0333     cb->args[1] = 0;
0334     cb->args[3] = 0;
0335     cb->args[4] = 0;
0336 release:
0337     release_sock(sk);
0338     return err;
0339 }
0340 
0341 static int sctp_sock_filter(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p)
0342 {
0343     struct sctp_comm_param *commp = p;
0344     struct sock *sk = ep->base.sk;
0345     const struct inet_diag_req_v2 *r = commp->r;
0346     struct sctp_association *assoc =
0347         list_entry(ep->asocs.next, struct sctp_association, asocs);
0348 
0349     /* find the ep only once through the transports by this condition */
0350     if (tsp->asoc != assoc)
0351         return 0;
0352 
0353     if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family)
0354         return 0;
0355 
0356     return 1;
0357 }
0358 
0359 static int sctp_ep_dump(struct sctp_endpoint *ep, void *p)
0360 {
0361     struct sctp_comm_param *commp = p;
0362     struct sock *sk = ep->base.sk;
0363     struct sk_buff *skb = commp->skb;
0364     struct netlink_callback *cb = commp->cb;
0365     const struct inet_diag_req_v2 *r = commp->r;
0366     struct net *net = sock_net(skb->sk);
0367     struct inet_sock *inet = inet_sk(sk);
0368     int err = 0;
0369 
0370     if (!net_eq(sock_net(sk), net))
0371         goto out;
0372 
0373     if (cb->args[4] < cb->args[1])
0374         goto next;
0375 
0376     if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs))
0377         goto next;
0378 
0379     if (r->sdiag_family != AF_UNSPEC &&
0380         sk->sk_family != r->sdiag_family)
0381         goto next;
0382 
0383     if (r->id.idiag_sport != inet->inet_sport &&
0384         r->id.idiag_sport)
0385         goto next;
0386 
0387     if (r->id.idiag_dport != inet->inet_dport &&
0388         r->id.idiag_dport)
0389         goto next;
0390 
0391     if (inet_sctp_diag_fill(sk, NULL, skb, r,
0392                 sk_user_ns(NETLINK_CB(cb->skb).sk),
0393                 NETLINK_CB(cb->skb).portid,
0394                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
0395                 cb->nlh, commp->net_admin) < 0) {
0396         err = 2;
0397         goto out;
0398     }
0399 next:
0400     cb->args[4]++;
0401 out:
0402     return err;
0403 }
0404 
0405 /* define the functions for sctp_diag_handler*/
0406 static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
0407                    void *info)
0408 {
0409     struct sctp_infox *infox = (struct sctp_infox *)info;
0410 
0411     if (infox->asoc) {
0412         r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc);
0413         r->idiag_wqueue = infox->asoc->sndbuf_used;
0414     } else {
0415         r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog);
0416         r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog);
0417     }
0418     if (infox->sctpinfo)
0419         sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo);
0420 }
0421 
0422 static int sctp_diag_dump_one(struct netlink_callback *cb,
0423                   const struct inet_diag_req_v2 *req)
0424 {
0425     struct sk_buff *skb = cb->skb;
0426     struct net *net = sock_net(skb->sk);
0427     const struct nlmsghdr *nlh = cb->nlh;
0428     union sctp_addr laddr, paddr;
0429     struct sctp_comm_param commp = {
0430         .skb = skb,
0431         .r = req,
0432         .nlh = nlh,
0433         .net_admin = netlink_net_capable(skb, CAP_NET_ADMIN),
0434     };
0435 
0436     if (req->sdiag_family == AF_INET) {
0437         laddr.v4.sin_port = req->id.idiag_sport;
0438         laddr.v4.sin_addr.s_addr = req->id.idiag_src[0];
0439         laddr.v4.sin_family = AF_INET;
0440 
0441         paddr.v4.sin_port = req->id.idiag_dport;
0442         paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0];
0443         paddr.v4.sin_family = AF_INET;
0444     } else {
0445         laddr.v6.sin6_port = req->id.idiag_sport;
0446         memcpy(&laddr.v6.sin6_addr, req->id.idiag_src,
0447                sizeof(laddr.v6.sin6_addr));
0448         laddr.v6.sin6_family = AF_INET6;
0449 
0450         paddr.v6.sin6_port = req->id.idiag_dport;
0451         memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst,
0452                sizeof(paddr.v6.sin6_addr));
0453         paddr.v6.sin6_family = AF_INET6;
0454     }
0455 
0456     return sctp_transport_lookup_process(sctp_sock_dump_one,
0457                          net, &laddr, &paddr, &commp);
0458 }
0459 
0460 static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
0461                const struct inet_diag_req_v2 *r)
0462 {
0463     u32 idiag_states = r->idiag_states;
0464     struct net *net = sock_net(skb->sk);
0465     struct sctp_comm_param commp = {
0466         .skb = skb,
0467         .cb = cb,
0468         .r = r,
0469         .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN),
0470     };
0471     int pos = cb->args[2];
0472 
0473     /* eps hashtable dumps
0474      * args:
0475      * 0 : if it will traversal listen sock
0476      * 1 : to record the sock pos of this time's traversal
0477      * 4 : to work as a temporary variable to traversal list
0478      */
0479     if (cb->args[0] == 0) {
0480         if (!(idiag_states & TCPF_LISTEN))
0481             goto skip;
0482         if (sctp_for_each_endpoint(sctp_ep_dump, &commp))
0483             goto done;
0484 skip:
0485         cb->args[0] = 1;
0486         cb->args[1] = 0;
0487         cb->args[4] = 0;
0488     }
0489 
0490     /* asocs by transport hashtable dump
0491      * args:
0492      * 1 : to record the assoc pos of this time's traversal
0493      * 2 : to record the transport pos of this time's traversal
0494      * 3 : to mark if we have dumped the ep info of the current asoc
0495      * 4 : to work as a temporary variable to traversal list
0496      * 5 : to save the sk we get from travelsing the tsp list.
0497      */
0498     if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE)))
0499         goto done;
0500 
0501     sctp_transport_traverse_process(sctp_sock_filter, sctp_sock_dump,
0502                     net, &pos, &commp);
0503     cb->args[2] = pos;
0504 
0505 done:
0506     cb->args[1] = cb->args[4];
0507     cb->args[4] = 0;
0508 }
0509 
0510 static const struct inet_diag_handler sctp_diag_handler = {
0511     .dump        = sctp_diag_dump,
0512     .dump_one    = sctp_diag_dump_one,
0513     .idiag_get_info  = sctp_diag_get_info,
0514     .idiag_type  = IPPROTO_SCTP,
0515     .idiag_info_size = sizeof(struct sctp_info),
0516 };
0517 
0518 static int __init sctp_diag_init(void)
0519 {
0520     return inet_diag_register(&sctp_diag_handler);
0521 }
0522 
0523 static void __exit sctp_diag_exit(void)
0524 {
0525     inet_diag_unregister(&sctp_diag_handler);
0526 }
0527 
0528 module_init(sctp_diag_init);
0529 module_exit(sctp_diag_exit);
0530 MODULE_LICENSE("GPL");
0531 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132);
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