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, NETLINK_CB(cb->skb).pid, 28 cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh); 29 } 30 31 static int udp_dump_one(struct udp_table *tbl, struct sk_buff *in_skb, 32 const struct nlmsghdr *nlh, struct inet_diag_req_v2 *req) 33 { 34 int err = -EINVAL; 35 struct sock *sk; 36 struct sk_buff *rep; 37 38 if (req->sdiag_family == AF_INET) 39 sk = __udp4_lib_lookup(&init_net, 40 req->id.idiag_src[0], req->id.idiag_sport, 41 req->id.idiag_dst[0], req->id.idiag_dport, 42 req->id.idiag_if, tbl); 43 #if IS_ENABLED(CONFIG_IPV6) 44 else if (req->sdiag_family == AF_INET6) 45 sk = __udp6_lib_lookup(&init_net, 46 (struct in6_addr *)req->id.idiag_src, 47 req->id.idiag_sport, 48 (struct in6_addr *)req->id.idiag_dst, 49 req->id.idiag_dport, 50 req->id.idiag_if, tbl); 51 #endif 52 else 53 goto out_nosk; 54 55 err = -ENOENT; 56 if (sk == NULL) 57 goto out_nosk; 58 59 err = sock_diag_check_cookie(sk, req->id.idiag_cookie); 60 if (err) 61 goto out; 62 63 err = -ENOMEM; 64 rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) + 65 sizeof(struct inet_diag_meminfo) + 66 64)), GFP_KERNEL); 67 if (!rep) 68 goto out; 69 70 err = inet_sk_diag_fill(sk, NULL, rep, req, 71 NETLINK_CB(in_skb).pid, 72 nlh->nlmsg_seq, 0, nlh); 73 if (err < 0) { 74 WARN_ON(err == -EMSGSIZE); 75 kfree_skb(rep); 76 goto out; 77 } 78 err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid, 79 MSG_DONTWAIT); 80 if (err > 0) 81 err = 0; 82 out: 83 if (sk) 84 sock_put(sk); 85 out_nosk: 86 return err; 87 } 88 89 static void udp_dump(struct udp_table *table, struct sk_buff *skb, struct netlink_callback *cb, 90 struct inet_diag_req_v2 *r, struct nlattr *bc) 91 { 92 int num, s_num, slot, s_slot; 93 94 s_slot = cb->args[0]; 95 num = s_num = cb->args[1]; 96 97 for (slot = s_slot; slot <= table->mask; num = s_num = 0, slot++) { 98 struct sock *sk; 99 struct hlist_nulls_node *node; 100 struct udp_hslot *hslot = &table->hash[slot]; 101 102 if (hlist_nulls_empty(&hslot->head)) 103 continue; 104 105 spin_lock_bh(&hslot->lock); 106 sk_nulls_for_each(sk, node, &hslot->head) { 107 struct inet_sock *inet = inet_sk(sk); 108 109 if (num < s_num) 110 goto next; 111 if (!(r->idiag_states & (1 << sk->sk_state))) 112 goto next; 113 if (r->sdiag_family != AF_UNSPEC && 114 sk->sk_family != r->sdiag_family) 115 goto next; 116 if (r->id.idiag_sport != inet->inet_sport && 117 r->id.idiag_sport) 118 goto next; 119 if (r->id.idiag_dport != inet->inet_dport && 120 r->id.idiag_dport) 121 goto next; 122 123 if (sk_diag_dump(sk, skb, cb, r, bc) < 0) { 124 spin_unlock_bh(&hslot->lock); 125 goto done; 126 } 127 next: 128 num++; 129 } 130 spin_unlock_bh(&hslot->lock); 131 } 132 done: 133 cb->args[0] = slot; 134 cb->args[1] = num; 135 } 136 137 static void udp_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 138 struct inet_diag_req_v2 *r, struct nlattr *bc) 139 { 140 udp_dump(&udp_table, skb, cb, r, bc); 141 } 142 143 static int udp_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, 144 struct inet_diag_req_v2 *req) 145 { 146 return udp_dump_one(&udp_table, in_skb, nlh, req); 147 } 148 149 static void udp_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 150 void *info) 151 { 152 r->idiag_rqueue = sk_rmem_alloc_get(sk); 153 r->idiag_wqueue = sk_wmem_alloc_get(sk); 154 } 155 156 static const struct inet_diag_handler udp_diag_handler = { 157 .dump = udp_diag_dump, 158 .dump_one = udp_diag_dump_one, 159 .idiag_get_info = udp_diag_get_info, 160 .idiag_type = IPPROTO_UDP, 161 }; 162 163 static void udplite_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 164 struct inet_diag_req_v2 *r, struct nlattr *bc) 165 { 166 udp_dump(&udplite_table, skb, cb, r, bc); 167 } 168 169 static int udplite_diag_dump_one(struct sk_buff *in_skb, const struct nlmsghdr *nlh, 170 struct inet_diag_req_v2 *req) 171 { 172 return udp_dump_one(&udplite_table, in_skb, nlh, req); 173 } 174 175 static const struct inet_diag_handler udplite_diag_handler = { 176 .dump = udplite_diag_dump, 177 .dump_one = udplite_diag_dump_one, 178 .idiag_get_info = udp_diag_get_info, 179 .idiag_type = IPPROTO_UDPLITE, 180 }; 181 182 static int __init udp_diag_init(void) 183 { 184 int err; 185 186 err = inet_diag_register(&udp_diag_handler); 187 if (err) 188 goto out; 189 err = inet_diag_register(&udplite_diag_handler); 190 if (err) 191 goto out_lite; 192 out: 193 return err; 194 out_lite: 195 inet_diag_unregister(&udp_diag_handler); 196 goto out; 197 } 198 199 static void __exit udp_diag_exit(void) 200 { 201 inet_diag_unregister(&udplite_diag_handler); 202 inet_diag_unregister(&udp_diag_handler); 203 } 204 205 module_init(udp_diag_init); 206 module_exit(udp_diag_exit); 207 MODULE_LICENSE("GPL"); 208 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-17 /* AF_INET - IPPROTO_UDP */); 209 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-136 /* AF_INET - IPPROTO_UDPLITE */); 210