| // SPDX-License-Identifier: GPL-2.0-or-later |
| /* SCTP kernel implementation |
| * (C) Copyright Red Hat Inc. 2017 |
| * |
| * This file is part of the SCTP kernel implementation |
| * |
| * These functions implement sctp diag support. |
| * |
| * Please send any bug reports or fixes you make to the |
| * email addresched(es): |
| * lksctp developers <linux-sctp@vger.kernel.org> |
| * |
| * Written or modified by: |
| * Xin Long <lucien.xin@gmail.com> |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/inet_diag.h> |
| #include <linux/sock_diag.h> |
| #include <net/sctp/sctp.h> |
| |
| static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, |
| void *info); |
| |
| /* define some functions to make asoc/ep fill look clean */ |
| static void inet_diag_msg_sctpasoc_fill(struct inet_diag_msg *r, |
| struct sock *sk, |
| struct sctp_association *asoc) |
| { |
| union sctp_addr laddr, paddr; |
| struct dst_entry *dst; |
| struct timer_list *t3_rtx = &asoc->peer.primary_path->T3_rtx_timer; |
| |
| laddr = list_entry(asoc->base.bind_addr.address_list.next, |
| struct sctp_sockaddr_entry, list)->a; |
| paddr = asoc->peer.primary_path->ipaddr; |
| dst = asoc->peer.primary_path->dst; |
| |
| r->idiag_family = sk->sk_family; |
| r->id.idiag_sport = htons(asoc->base.bind_addr.port); |
| r->id.idiag_dport = htons(asoc->peer.port); |
| r->id.idiag_if = dst ? dst->dev->ifindex : 0; |
| sock_diag_save_cookie(sk, r->id.idiag_cookie); |
| |
| #if IS_ENABLED(CONFIG_IPV6) |
| if (sk->sk_family == AF_INET6) { |
| *(struct in6_addr *)r->id.idiag_src = laddr.v6.sin6_addr; |
| *(struct in6_addr *)r->id.idiag_dst = paddr.v6.sin6_addr; |
| } else |
| #endif |
| { |
| memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src)); |
| memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst)); |
| |
| r->id.idiag_src[0] = laddr.v4.sin_addr.s_addr; |
| r->id.idiag_dst[0] = paddr.v4.sin_addr.s_addr; |
| } |
| |
| r->idiag_state = asoc->state; |
| if (timer_pending(t3_rtx)) { |
| r->idiag_timer = SCTP_EVENT_TIMEOUT_T3_RTX; |
| r->idiag_retrans = asoc->rtx_data_chunks; |
| r->idiag_expires = jiffies_to_msecs(t3_rtx->expires - jiffies); |
| } |
| } |
| |
| static int inet_diag_msg_sctpladdrs_fill(struct sk_buff *skb, |
| struct list_head *address_list) |
| { |
| struct sctp_sockaddr_entry *laddr; |
| int addrlen = sizeof(struct sockaddr_storage); |
| int addrcnt = 0; |
| struct nlattr *attr; |
| void *info = NULL; |
| |
| list_for_each_entry_rcu(laddr, address_list, list) |
| addrcnt++; |
| |
| attr = nla_reserve(skb, INET_DIAG_LOCALS, addrlen * addrcnt); |
| if (!attr) |
| return -EMSGSIZE; |
| |
| info = nla_data(attr); |
| list_for_each_entry_rcu(laddr, address_list, list) { |
| memcpy(info, &laddr->a, sizeof(laddr->a)); |
| memset(info + sizeof(laddr->a), 0, addrlen - sizeof(laddr->a)); |
| info += addrlen; |
| } |
| |
| return 0; |
| } |
| |
| static int inet_diag_msg_sctpaddrs_fill(struct sk_buff *skb, |
| struct sctp_association *asoc) |
| { |
| int addrlen = sizeof(struct sockaddr_storage); |
| struct sctp_transport *from; |
| struct nlattr *attr; |
| void *info = NULL; |
| |
| attr = nla_reserve(skb, INET_DIAG_PEERS, |
| addrlen * asoc->peer.transport_count); |
| if (!attr) |
| return -EMSGSIZE; |
| |
| info = nla_data(attr); |
| list_for_each_entry(from, &asoc->peer.transport_addr_list, |
| transports) { |
| memcpy(info, &from->ipaddr, sizeof(from->ipaddr)); |
| memset(info + sizeof(from->ipaddr), 0, |
| addrlen - sizeof(from->ipaddr)); |
| info += addrlen; |
| } |
| |
| return 0; |
| } |
| |
| /* sctp asoc/ep fill*/ |
| static int inet_sctp_diag_fill(struct sock *sk, struct sctp_association *asoc, |
| struct sk_buff *skb, |
| const struct inet_diag_req_v2 *req, |
| struct user_namespace *user_ns, |
| int portid, u32 seq, u16 nlmsg_flags, |
| const struct nlmsghdr *unlh, |
| bool net_admin) |
| { |
| struct sctp_endpoint *ep = sctp_sk(sk)->ep; |
| struct list_head *addr_list; |
| struct inet_diag_msg *r; |
| struct nlmsghdr *nlh; |
| int ext = req->idiag_ext; |
| struct sctp_infox infox; |
| void *info = NULL; |
| |
| nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r), |
| nlmsg_flags); |
| if (!nlh) |
| return -EMSGSIZE; |
| |
| r = nlmsg_data(nlh); |
| BUG_ON(!sk_fullsock(sk)); |
| |
| r->idiag_timer = 0; |
| r->idiag_retrans = 0; |
| r->idiag_expires = 0; |
| if (asoc) { |
| inet_diag_msg_sctpasoc_fill(r, sk, asoc); |
| } else { |
| inet_diag_msg_common_fill(r, sk); |
| r->idiag_state = sk->sk_state; |
| } |
| |
| if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin)) |
| goto errout; |
| |
| if (ext & (1 << (INET_DIAG_SKMEMINFO - 1))) { |
| u32 mem[SK_MEMINFO_VARS]; |
| int amt; |
| |
| if (asoc && asoc->ep->sndbuf_policy) |
| amt = asoc->sndbuf_used; |
| else |
| amt = sk_wmem_alloc_get(sk); |
| mem[SK_MEMINFO_WMEM_ALLOC] = amt; |
| if (asoc && asoc->ep->rcvbuf_policy) |
| amt = atomic_read(&asoc->rmem_alloc); |
| else |
| amt = sk_rmem_alloc_get(sk); |
| mem[SK_MEMINFO_RMEM_ALLOC] = amt; |
| mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; |
| mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; |
| mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; |
| mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; |
| mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); |
| mem[SK_MEMINFO_BACKLOG] = READ_ONCE(sk->sk_backlog.len); |
| mem[SK_MEMINFO_DROPS] = atomic_read(&sk->sk_drops); |
| |
| if (nla_put(skb, INET_DIAG_SKMEMINFO, sizeof(mem), &mem) < 0) |
| goto errout; |
| } |
| |
| if (ext & (1 << (INET_DIAG_INFO - 1))) { |
| struct nlattr *attr; |
| |
| attr = nla_reserve_64bit(skb, INET_DIAG_INFO, |
| sizeof(struct sctp_info), |
| INET_DIAG_PAD); |
| if (!attr) |
| goto errout; |
| |
| info = nla_data(attr); |
| } |
| infox.sctpinfo = (struct sctp_info *)info; |
| infox.asoc = asoc; |
| sctp_diag_get_info(sk, r, &infox); |
| |
| addr_list = asoc ? &asoc->base.bind_addr.address_list |
| : &ep->base.bind_addr.address_list; |
| if (inet_diag_msg_sctpladdrs_fill(skb, addr_list)) |
| goto errout; |
| |
| if (asoc && (ext & (1 << (INET_DIAG_CONG - 1)))) |
| if (nla_put_string(skb, INET_DIAG_CONG, "reno") < 0) |
| goto errout; |
| |
| if (asoc && inet_diag_msg_sctpaddrs_fill(skb, asoc)) |
| goto errout; |
| |
| nlmsg_end(skb, nlh); |
| return 0; |
| |
| errout: |
| nlmsg_cancel(skb, nlh); |
| return -EMSGSIZE; |
| } |
| |
| /* callback and param */ |
| struct sctp_comm_param { |
| struct sk_buff *skb; |
| struct netlink_callback *cb; |
| const struct inet_diag_req_v2 *r; |
| const struct nlmsghdr *nlh; |
| bool net_admin; |
| }; |
| |
| static size_t inet_assoc_attr_size(struct sctp_association *asoc) |
| { |
| int addrlen = sizeof(struct sockaddr_storage); |
| int addrcnt = 0; |
| struct sctp_sockaddr_entry *laddr; |
| |
| list_for_each_entry_rcu(laddr, &asoc->base.bind_addr.address_list, |
| list) |
| addrcnt++; |
| |
| return nla_total_size(sizeof(struct sctp_info)) |
| + nla_total_size(addrlen * asoc->peer.transport_count) |
| + nla_total_size(addrlen * addrcnt) |
| + nla_total_size(sizeof(struct inet_diag_msg)) |
| + inet_diag_msg_attrs_size() |
| + nla_total_size(sizeof(struct inet_diag_meminfo)) |
| + 64; |
| } |
| |
| static int sctp_sock_dump_one(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p) |
| { |
| struct sctp_association *assoc = tsp->asoc; |
| struct sctp_comm_param *commp = p; |
| struct sock *sk = ep->base.sk; |
| const struct inet_diag_req_v2 *req = commp->r; |
| struct sk_buff *skb = commp->skb; |
| struct sk_buff *rep; |
| int err; |
| |
| err = sock_diag_check_cookie(sk, req->id.idiag_cookie); |
| if (err) |
| return err; |
| |
| rep = nlmsg_new(inet_assoc_attr_size(assoc), GFP_KERNEL); |
| if (!rep) |
| return -ENOMEM; |
| |
| lock_sock(sk); |
| if (ep != assoc->ep) { |
| err = -EAGAIN; |
| goto out; |
| } |
| |
| err = inet_sctp_diag_fill(sk, assoc, rep, req, sk_user_ns(NETLINK_CB(skb).sk), |
| NETLINK_CB(skb).portid, commp->nlh->nlmsg_seq, 0, |
| commp->nlh, commp->net_admin); |
| if (err < 0) { |
| WARN_ON(err == -EMSGSIZE); |
| goto out; |
| } |
| release_sock(sk); |
| |
| return nlmsg_unicast(sock_net(skb->sk)->diag_nlsk, rep, NETLINK_CB(skb).portid); |
| |
| out: |
| release_sock(sk); |
| kfree_skb(rep); |
| return err; |
| } |
| |
| static int sctp_sock_dump(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p) |
| { |
| struct sctp_comm_param *commp = p; |
| struct sock *sk = ep->base.sk; |
| struct sk_buff *skb = commp->skb; |
| struct netlink_callback *cb = commp->cb; |
| const struct inet_diag_req_v2 *r = commp->r; |
| struct sctp_association *assoc; |
| int err = 0; |
| |
| lock_sock(sk); |
| if (ep != tsp->asoc->ep) |
| goto release; |
| list_for_each_entry(assoc, &ep->asocs, asocs) { |
| if (cb->args[4] < cb->args[1]) |
| goto next; |
| |
| if (r->id.idiag_sport != htons(assoc->base.bind_addr.port) && |
| r->id.idiag_sport) |
| goto next; |
| if (r->id.idiag_dport != htons(assoc->peer.port) && |
| r->id.idiag_dport) |
| goto next; |
| |
| if (!cb->args[3] && |
| inet_sctp_diag_fill(sk, NULL, skb, r, |
| sk_user_ns(NETLINK_CB(cb->skb).sk), |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, |
| NLM_F_MULTI, cb->nlh, |
| commp->net_admin) < 0) { |
| err = 1; |
| goto release; |
| } |
| cb->args[3] = 1; |
| |
| if (inet_sctp_diag_fill(sk, assoc, skb, r, |
| sk_user_ns(NETLINK_CB(cb->skb).sk), |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, 0, cb->nlh, |
| commp->net_admin) < 0) { |
| err = 1; |
| goto release; |
| } |
| next: |
| cb->args[4]++; |
| } |
| cb->args[1] = 0; |
| cb->args[3] = 0; |
| cb->args[4] = 0; |
| release: |
| release_sock(sk); |
| return err; |
| } |
| |
| static int sctp_sock_filter(struct sctp_endpoint *ep, struct sctp_transport *tsp, void *p) |
| { |
| struct sctp_comm_param *commp = p; |
| struct sock *sk = ep->base.sk; |
| const struct inet_diag_req_v2 *r = commp->r; |
| struct sctp_association *assoc = |
| list_entry(ep->asocs.next, struct sctp_association, asocs); |
| |
| /* find the ep only once through the transports by this condition */ |
| if (tsp->asoc != assoc) |
| return 0; |
| |
| if (r->sdiag_family != AF_UNSPEC && sk->sk_family != r->sdiag_family) |
| return 0; |
| |
| return 1; |
| } |
| |
| static int sctp_ep_dump(struct sctp_endpoint *ep, void *p) |
| { |
| struct sctp_comm_param *commp = p; |
| struct sock *sk = ep->base.sk; |
| struct sk_buff *skb = commp->skb; |
| struct netlink_callback *cb = commp->cb; |
| const struct inet_diag_req_v2 *r = commp->r; |
| struct net *net = sock_net(skb->sk); |
| struct inet_sock *inet = inet_sk(sk); |
| int err = 0; |
| |
| if (!net_eq(sock_net(sk), net)) |
| goto out; |
| |
| if (cb->args[4] < cb->args[1]) |
| goto next; |
| |
| if (!(r->idiag_states & TCPF_LISTEN) && !list_empty(&ep->asocs)) |
| goto next; |
| |
| if (r->sdiag_family != AF_UNSPEC && |
| sk->sk_family != r->sdiag_family) |
| goto next; |
| |
| if (r->id.idiag_sport != inet->inet_sport && |
| r->id.idiag_sport) |
| goto next; |
| |
| if (r->id.idiag_dport != inet->inet_dport && |
| r->id.idiag_dport) |
| goto next; |
| |
| if (inet_sctp_diag_fill(sk, NULL, skb, r, |
| sk_user_ns(NETLINK_CB(cb->skb).sk), |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| cb->nlh, commp->net_admin) < 0) { |
| err = 2; |
| goto out; |
| } |
| next: |
| cb->args[4]++; |
| out: |
| return err; |
| } |
| |
| /* define the functions for sctp_diag_handler*/ |
| static void sctp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, |
| void *info) |
| { |
| struct sctp_infox *infox = (struct sctp_infox *)info; |
| |
| if (infox->asoc) { |
| r->idiag_rqueue = atomic_read(&infox->asoc->rmem_alloc); |
| r->idiag_wqueue = infox->asoc->sndbuf_used; |
| } else { |
| r->idiag_rqueue = READ_ONCE(sk->sk_ack_backlog); |
| r->idiag_wqueue = READ_ONCE(sk->sk_max_ack_backlog); |
| } |
| if (infox->sctpinfo) |
| sctp_get_sctp_info(sk, infox->asoc, infox->sctpinfo); |
| } |
| |
| static int sctp_diag_dump_one(struct netlink_callback *cb, |
| const struct inet_diag_req_v2 *req) |
| { |
| struct sk_buff *skb = cb->skb; |
| struct net *net = sock_net(skb->sk); |
| const struct nlmsghdr *nlh = cb->nlh; |
| union sctp_addr laddr, paddr; |
| struct sctp_comm_param commp = { |
| .skb = skb, |
| .r = req, |
| .nlh = nlh, |
| .net_admin = netlink_net_capable(skb, CAP_NET_ADMIN), |
| }; |
| |
| if (req->sdiag_family == AF_INET) { |
| laddr.v4.sin_port = req->id.idiag_sport; |
| laddr.v4.sin_addr.s_addr = req->id.idiag_src[0]; |
| laddr.v4.sin_family = AF_INET; |
| |
| paddr.v4.sin_port = req->id.idiag_dport; |
| paddr.v4.sin_addr.s_addr = req->id.idiag_dst[0]; |
| paddr.v4.sin_family = AF_INET; |
| } else { |
| laddr.v6.sin6_port = req->id.idiag_sport; |
| memcpy(&laddr.v6.sin6_addr, req->id.idiag_src, |
| sizeof(laddr.v6.sin6_addr)); |
| laddr.v6.sin6_family = AF_INET6; |
| |
| paddr.v6.sin6_port = req->id.idiag_dport; |
| memcpy(&paddr.v6.sin6_addr, req->id.idiag_dst, |
| sizeof(paddr.v6.sin6_addr)); |
| paddr.v6.sin6_family = AF_INET6; |
| } |
| |
| return sctp_transport_lookup_process(sctp_sock_dump_one, |
| net, &laddr, &paddr, &commp); |
| } |
| |
| static void sctp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, |
| const struct inet_diag_req_v2 *r) |
| { |
| u32 idiag_states = r->idiag_states; |
| struct net *net = sock_net(skb->sk); |
| struct sctp_comm_param commp = { |
| .skb = skb, |
| .cb = cb, |
| .r = r, |
| .net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN), |
| }; |
| int pos = cb->args[2]; |
| |
| /* eps hashtable dumps |
| * args: |
| * 0 : if it will traversal listen sock |
| * 1 : to record the sock pos of this time's traversal |
| * 4 : to work as a temporary variable to traversal list |
| */ |
| if (cb->args[0] == 0) { |
| if (!(idiag_states & TCPF_LISTEN)) |
| goto skip; |
| if (sctp_for_each_endpoint(sctp_ep_dump, &commp)) |
| goto done; |
| skip: |
| cb->args[0] = 1; |
| cb->args[1] = 0; |
| cb->args[4] = 0; |
| } |
| |
| /* asocs by transport hashtable dump |
| * args: |
| * 1 : to record the assoc pos of this time's traversal |
| * 2 : to record the transport pos of this time's traversal |
| * 3 : to mark if we have dumped the ep info of the current asoc |
| * 4 : to work as a temporary variable to traversal list |
| * 5 : to save the sk we get from travelsing the tsp list. |
| */ |
| if (!(idiag_states & ~(TCPF_LISTEN | TCPF_CLOSE))) |
| goto done; |
| |
| sctp_transport_traverse_process(sctp_sock_filter, sctp_sock_dump, |
| net, &pos, &commp); |
| cb->args[2] = pos; |
| |
| done: |
| cb->args[1] = cb->args[4]; |
| cb->args[4] = 0; |
| } |
| |
| static const struct inet_diag_handler sctp_diag_handler = { |
| .dump = sctp_diag_dump, |
| .dump_one = sctp_diag_dump_one, |
| .idiag_get_info = sctp_diag_get_info, |
| .idiag_type = IPPROTO_SCTP, |
| .idiag_info_size = sizeof(struct sctp_info), |
| }; |
| |
| static int __init sctp_diag_init(void) |
| { |
| return inet_diag_register(&sctp_diag_handler); |
| } |
| |
| static void __exit sctp_diag_exit(void) |
| { |
| inet_diag_unregister(&sctp_diag_handler); |
| } |
| |
| module_init(sctp_diag_init); |
| module_exit(sctp_diag_exit); |
| MODULE_LICENSE("GPL"); |
| MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-132); |