diff options
Diffstat (limited to '')
| -rw-r--r-- | net/sctp/diag.c | 529 |
1 files changed, 529 insertions, 0 deletions
diff --git a/net/sctp/diag.c b/net/sctp/diag.c new file mode 100644 index 000000000..b0ce10808 --- /dev/null +++ b/net/sctp/diag.c @@ -0,0 +1,529 @@ +// 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; + + /* find the ep only once through the transports by this condition */ + if (!list_is_first(&tsp->asoc->asocs, &ep->asocs)) + 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); |