linux/net/ipv4/udp_diag.c
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   1/*
   2 * udp_diag.c   Module for monitoring UDP transport protocols sockets.
   3 *
   4 * Authors:     Pavel Emelyanov, <xemul@parallels.com>
   5 *
   6 *      This program is free software; you can redistribute it and/or
   7 *      modify it under the terms of the GNU General Public License
   8 *      as published by the Free Software Foundation; either version
   9 *      2 of the License, or (at your option) any later version.
  10 */
  11
  12
  13#include <linux/module.h>
  14#include <linux/inet_diag.h>
  15#include <linux/udp.h>
  16#include <net/udp.h>
  17#include <net/udplite.h>
  18#include <linux/sock_diag.h>
  19
  20static int sk_diag_dump(struct sock *sk, struct sk_buff *skb,
  21                struct netlink_callback *cb, struct inet_diag_req_v2 *req,
  22                struct nlattr *bc)
  23{
  24        if (!inet_diag_bc_sk(bc, sk))
  25                return 0;
  26
  27        return inet_sk_diag_fill(sk, NULL, skb, req,
  28                        sk_user_ns(NETLINK_CB(cb->skb).ssk),
  29                        NETLINK_CB(cb->skb).portid,
  30                        cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
  31}
  32
  33static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb,
  34                const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req)
  35{
  36        int err = -EINVAL;
  37        struct sock *sk;
  38        struct sk_buff *rep;
  39        struct net *net = sock_net(in_skb->sk);
  40
  41        if (req->sdiag_family == AF_INET)
  42                sk = __udp4_lib_lookup(net,
  43                                req->id.idiag_src[0], req->id.idiag_sport,
  44                                req->id.idiag_dst[0], req->id.idiag_dport,
  45                                req->id.idiag_if, tbl);
  46#if IS_ENABLED(CONFIG_IPV6)
  47        else if (req->sdiag_family == AF_INET6)
  48                sk = __udp6_lib_lookup(net,
  49                                (struct in6_addr *)req->id.idiag_src,
  50                                req->id.idiag_sport,
  51                                (struct in6_addr *)req->id.idiag_dst,
  52                                req->id.idiag_dport,
  53                                req->id.idiag_if, tbl);
  54#endif
  55        else
  56                goto out_nosk;
  57
  58        err = -ENOENT;
  59        if (sk == NULL)
  60                goto out_nosk;
  61
  62        err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
  63        if (err)
  64                goto out;
  65
  66        err = -ENOMEM;
  67        rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
  68                                     sizeof(struct inet_diag_meminfo) +
  69                                     64)), GFP_KERNEL);
  70        if (!rep)
  71                goto out;
  72
  73        err = inet_sk_diag_fill(sk, NULL, rep, req,
  74                           sk_user_ns(NETLINK_CB(in_skb).ssk),
  75                           NETLINK_CB(in_skb).portid,
  76                           nlh->nlmsg_seq, 0, nlh);
  77        if (err < 0) {
  78                WARN_ON(err == -EMSGSIZE);
  79                kfree_skb(rep);
  80                goto out;
  81        }
  82        err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
  83                              MSG_DONTWAIT);
  84        if (err > 0)
  85                err = 0;
  86out:
  87        if (sk)
  88                sock_put(sk);
  89out_nosk:
  90        return err;
  91}
  92
  93static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlink_callback *cb,
  94                struct inet_diag_req_v2 *r, struct nlattr *bc)
  95{
  96        int num, s_num, slot, s_slot;
  97        struct net *net = sock_net(skb->sk);
  98
  99        s_slot = cb->args[0];
 100        num = s_num = cb->args[1];
 101
 102        for (slot = s_slot; slot <= table->mask; num = s_num = 0, slot++) {
 103                struct sock *sk;
 104                struct hlist_nulls_node *node;
 105                struct udp_hslot *hslot = &table->hash[slot];
 106
 107                if (hlist_nulls_empty(&hslot->head))
 108                        continue;
 109
 110                spin_lock_bh(&hslot->lock);
 111                sk_nulls_for_each(sk, node, &hslot->head) {
 112                        struct inet_sock *inet = inet_sk(sk);
 113
 114                        if (!net_eq(sock_net(sk), net))
 115                                continue;
 116                        if (num < s_num)
 117                                goto next;
 118                        if (!(r->idiag_states & (1 << sk->sk_state)))
 119                                goto next;
 120                        if (r->sdiag_family != AF_UNSPEC &&
 121                                        sk->sk_family != r->sdiag_family)
 122                                goto next;
 123                        if (r->id.idiag_sport != inet->inet_sport &&
 124                            r->id.idiag_sport)
 125                                goto next;
 126                        if (r->id.idiag_dport != inet->inet_dport &&
 127                            r->id.idiag_dport)
 128                                goto next;
 129
 130                        if (sk_diag_dump(sk, skb, cb, r, bc) < 0) {
 131                                spin_unlock_bh(&hslot->lock);
 132                                goto done;
 133                        }
 134next:
 135                        num++;
 136                }
 137                spin_unlock_bh(&hslot->lock);
 138        }
 139done:
 140        cb->args[0] = slot;
 141        cb->args[1] = num;
 142}
 143
 144static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 145                struct inet_diag_req_v2 *r, struct nlattr *bc)
 146{
 147        udp_dump(&udp_table, skb, cb, r, bc);
 148}
 149
 150static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
 151                struct inet_diag_req_v2 *req)
 152{
 153        return udp_dump_one(&udp_table, in_skb, nlh, req);
 154}
 155
 156static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,
 157                void *info)
 158{
 159        r->idiag_rqueue = sk_rmem_alloc_get(sk);
 160        r->idiag_wqueue = sk_wmem_alloc_get(sk);
 161}
 162
 163static const struct inet_diag_handler udp_diag_handler = {
 164        .dump            = udp_diag_dump,
 165        .dump_one        = udp_diag_dump_one,
 166        .idiag_get_info  = udp_diag_get_info,
 167        .idiag_type      = IPPROTO_UDP,
 168};
 169
 170static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
 171                struct inet_diag_req_v2 *r, struct nlattr *bc)
 172{
 173        udp_dump(&udplite_table, skb, cb, r, bc);
 174}
 175
 176static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh,
 177                struct inet_diag_req_v2 *req)
 178{
 179        return udp_dump_one(&udplite_table, in_skb, nlh, req);
 180}
 181
 182static const struct inet_diag_handler udplite_diag_handler = {
 183        .dump            = udplite_diag_dump,
 184        .dump_one        = udplite_diag_dump_one,
 185        .idiag_get_info  = udp_diag_get_info,
 186        .idiag_type      = IPPROTO_UDPLITE,
 187};
 188
 189static int __init udp_diag_init(void)
 190{
 191        int err;
 192
 193        err = inet_diag_register(&udp_diag_handler);
 194        if (err)
 195                goto out;
 196        err = inet_diag_register(&udplite_diag_handler);
 197        if (err)
 198                goto out_lite;
 199out:
 200        return err;
 201out_lite:
 202        inet_diag_unregister(&udp_diag_handler);
 203        goto out;
 204}
 205
 206static void __exit udp_diag_exit(void)
 207{
 208        inet_diag_unregister(&udplite_diag_handler);
 209        inet_diag_unregister(&udp_diag_handler);
 210}
 211
 212module_init(udp_diag_init);
 213module_exit(udp_diag_exit);
 214MODULE_LICENSE("GPL");
 215MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */);
 216MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */);
 217
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