diff options
Diffstat (limited to 'net/ipv4/udp_diag.c')
| -rw-r--r-- | net/ipv4/udp_diag.c | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/net/ipv4/udp_diag.c b/net/ipv4/udp_diag.c new file mode 100644 index 000000000000..69f8a7ca63dd --- /dev/null +++ b/net/ipv4/udp_diag.c @@ -0,0 +1,201 @@ +/* + * 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/inet_diag.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 *req, + struct nlattr *bc) +{ + if (!inet_diag_bc_sk(bc, sk)) + return 0; + + return inet_sk_diag_fill(sk, NULL, skb, req, NETLINK_CB(cb->skb).pid, + 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 *req) +{ + int err = -EINVAL; + struct sock *sk; + struct sk_buff *rep; + + if (req->sdiag_family == AF_INET) + sk = __udp4_lib_lookup(&init_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(&init_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 = alloc_skb(NLMSG_SPACE((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, + NETLINK_CB(in_skb).pid, + nlh->nlmsg_seq, 0, nlh); + if (err < 0) { + WARN_ON(err == -EMSGSIZE); + kfree_skb(rep); + goto out; + } + err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, + 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 *r, struct nlattr *bc) +{ + int num, s_num, slot, s_slot; + + 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 (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 *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 *req) +{ + return udp_dump_one(&udp_table, in_skb, nlh, req); +} + +static const struct inet_diag_handler udp_diag_handler = { + .dump = udp_diag_dump, + .dump_one = udp_diag_dump_one, + .idiag_type = IPPROTO_UDP, +}; + +static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, + struct inet_diag_req *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 *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_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 */); 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