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 20 static 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 33 static 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; 86 out: 87 if (sk) 88 sock_put(sk); 89 out_nosk: 90 return err; 91 } 92 93 static 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 } 134 next: 135 num++; 136 } 137 spin_unlock_bh(&hslot->lock); 138 } 139 done: 140 cb->args[0] = slot; 141 cb->args[1] = num; 142 } 143 144 static 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 } 149 150 static 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 } 155 156 static 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 } 162 163 static 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 }; 169 170 static 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 } 175 176 static 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 } 181 182 static 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 }; 188 189 static 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; 199 out: 200 return err; 201 out_lite: 202 inet_diag_unregister(&udp_diag_handler); 203 goto out; 204 } 205 206 static void __exit udp_diag_exit(void) 207 { 208 inet_diag_unregister(&udplite_diag_handler); 209 inet_diag_unregister(&udp_diag_handler); 210 } 211 212 module_init(udp_diag_init); 213 module_exit(udp_diag_exit); 214 MODULE_LICENSE("GPL"); 215 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */); 216 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */); 217