/* * udp_diag.c Module for monitoring UDP transport protocols sockets. * * Authors: Pavel Emelyanov, <xemul@parallels.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #include <linux/module.h> #include <linux/inet_diag.h> #include <linux/udp.h> #include <net/udp.h> #include <net/udplite.h> #include <linux/sock_diag.h> static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, struct netlink_callback *cb, struct inet_diag_req_v2 *req, struct nlattr *bc) { if (!inet_diag_bc_sk(bc, sk)) return 0; return inet_sk_diag_fill(sk, NULL, skb, req, sk_user_ns(NETLINK_CB(cb->skb).sk), NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); } static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb, const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) { int err = -EINVAL; struct sock *sk; struct sk_buff *rep; struct net *net = sock_net(in_skb->sk); if (req->sdiag_family == AF_INET) sk = __udp4_lib_lookup(net, req->id.idiag_src[0], req->id.idiag_sport, req->id.idiag_dst[0], req->id.idiag_dport, req->id.idiag_if, tbl); #if IS_ENABLED(CONFIG_IPV6) else if (req->sdiag_family == AF_INET6) sk = __udp6_lib_lookup(net, (struct in6_addr *)req->id.idiag_src, req->id.idiag_sport, (struct in6_addr *)req->id.idiag_dst, req->id.idiag_dport, req->id.idiag_if, tbl); #endif else goto out_nosk; err = -ENOENT; if (sk == NULL) goto out_nosk; err = sock_diag_check_cookie(sk, req->id.idiag_cookie); if (err) goto out; err = -ENOMEM; rep = nlmsg_new(sizeof(struct inet_diag_msg) + sizeof(struct inet_diag_meminfo) + 64, GFP_KERNEL); if (!rep) goto out; err = inet_sk_diag_fill(sk, NULL, rep, req, sk_user_ns(NETLINK_CB(in_skb).sk), NETLINK_CB(in_skb).portid, nlh->nlmsg_seq, 0, nlh); if (err < 0) { WARN_ON(err == -EMSGSIZE); kfree_skb(rep); goto out; } err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid, MSG_DONTWAIT); if (err > 0) err = 0; out: if (sk) sock_put(sk); out_nosk: return err; } static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) { int num, s_num, slot, s_slot; struct net *net = sock_net(skb->sk); s_slot = cb->args[0]; num = s_num = cb->args[1]; for (slot = s_slot; slot <= table->mask; num = s_num = 0, slot++) { struct sock *sk; struct hlist_nulls_node *node; struct udp_hslot *hslot = &table->hash[slot]; if (hlist_nulls_empty(&hslot->head)) continue; spin_lock_bh(&hslot->lock); sk_nulls_for_each(sk, node, &hslot->head) { struct inet_sock *inet = inet_sk(sk); if (!net_eq(sock_net(sk), net)) continue; if (num < s_num) goto next; if (!(r->idiag_states & (1 << sk->sk_state))) 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 (sk_diag_dump(sk, skb, cb, r, bc) < 0) { spin_unlock_bh(&hslot->lock); goto done; } next: num++; } spin_unlock_bh(&hslot->lock); } done: cb->args[0] = slot; cb->args[1] = num; } static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) { udp_dump(&udp_table, skb, cb, r, bc); } static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) { return udp_dump_one(&udp_table, in_skb, nlh, req); } static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, void *info) { r->idiag_rqueue = sk_rmem_alloc_get(sk); r->idiag_wqueue = sk_wmem_alloc_get(sk); } static const struct inet_diag_handler udp_diag_handler = { .dump = udp_diag_dump, .dump_one = udp_diag_dump_one, .idiag_get_info = udp_diag_get_info, .idiag_type = IPPROTO_UDP, }; static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, struct inet_diag_req_v2 *r, struct nlattr *bc) { udp_dump(&udplite_table, skb, cb, r, bc); } static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) { return udp_dump_one(&udplite_table, in_skb, nlh, req); } static const struct inet_diag_handler udplite_diag_handler = { .dump = udplite_diag_dump, .dump_one = udplite_diag_dump_one, .idiag_get_info = udp_diag_get_info, .idiag_type = IPPROTO_UDPLITE, }; static int __init udp_diag_init(void) { int err; err = inet_diag_register(&udp_diag_handler); if (err) goto out; err = inet_diag_register(&udplite_diag_handler); if (err) goto out_lite; out: return err; out_lite: inet_diag_unregister(&udp_diag_handler); goto out; } static void __exit udp_diag_exit(void) { inet_diag_unregister(&udplite_diag_handler); inet_diag_unregister(&udp_diag_handler); } module_init(udp_diag_init); module_exit(udp_diag_exit); MODULE_LICENSE("GPL"); MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */); MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);