Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * INET An implementation of the TCP/IP protocol suite for the LINUX |
| 3 | * operating system. INET is implemented using the BSD Socket |
| 4 | * interface as the means of communication with the user level. |
| 5 | * |
| 6 | * "Ping" sockets |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public License |
| 10 | * as published by the Free Software Foundation; either version |
| 11 | * 2 of the License, or (at your option) any later version. |
| 12 | * |
| 13 | * Based on ipv4/udp.c code. |
| 14 | * |
| 15 | * Authors: Vasiliy Kulikov / Openwall (for Linux 2.6), |
| 16 | * Pavel Kankovsky (for Linux 2.4.32) |
| 17 | * |
| 18 | * Pavel gave all rights to bugs to Vasiliy, |
| 19 | * none of the bugs are Pavel's now. |
| 20 | * |
| 21 | */ |
| 22 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 23 | #include <linux/uaccess.h> |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 24 | #include <linux/types.h> |
| 25 | #include <linux/fcntl.h> |
| 26 | #include <linux/socket.h> |
| 27 | #include <linux/sockios.h> |
| 28 | #include <linux/in.h> |
| 29 | #include <linux/errno.h> |
| 30 | #include <linux/timer.h> |
| 31 | #include <linux/mm.h> |
| 32 | #include <linux/inet.h> |
| 33 | #include <linux/netdevice.h> |
| 34 | #include <net/snmp.h> |
| 35 | #include <net/ip.h> |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 36 | #include <net/icmp.h> |
| 37 | #include <net/protocol.h> |
| 38 | #include <linux/skbuff.h> |
| 39 | #include <linux/proc_fs.h> |
Paul Gortmaker | bc3b2d7 | 2011-07-15 11:47:34 -0400 | [diff] [blame] | 40 | #include <linux/export.h> |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 41 | #include <net/sock.h> |
| 42 | #include <net/ping.h> |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 43 | #include <net/udp.h> |
| 44 | #include <net/route.h> |
| 45 | #include <net/inet_common.h> |
| 46 | #include <net/checksum.h> |
| 47 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 48 | #if IS_ENABLED(CONFIG_IPV6) |
| 49 | #include <linux/in6.h> |
| 50 | #include <linux/icmpv6.h> |
| 51 | #include <net/addrconf.h> |
| 52 | #include <net/ipv6.h> |
| 53 | #include <net/transp_v6.h> |
| 54 | #endif |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 55 | |
Stephen Hemminger | ea074b3 | 2013-12-28 11:11:42 -0800 | [diff] [blame] | 56 | struct ping_table { |
| 57 | struct hlist_nulls_head hash[PING_HTABLE_SIZE]; |
| 58 | rwlock_t lock; |
| 59 | }; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 60 | |
Stephen Hemminger | ea074b3 | 2013-12-28 11:11:42 -0800 | [diff] [blame] | 61 | static struct ping_table ping_table; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 62 | struct pingv6_ops pingv6_ops; |
| 63 | EXPORT_SYMBOL_GPL(pingv6_ops); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 64 | |
Eric Dumazet | 1b1cb1f | 2011-05-13 22:59:19 +0000 | [diff] [blame] | 65 | static u16 ping_port_rover; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 66 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 67 | static inline u32 ping_hashfn(const struct net *net, u32 num, u32 mask) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 68 | { |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 69 | u32 res = (num + net_hash_mix(net)) & mask; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 70 | |
Eric Dumazet | 6eada01 | 2015-03-18 14:05:33 -0700 | [diff] [blame] | 71 | pr_debug("hash(%u) = %u\n", num, res); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 72 | return res; |
| 73 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 74 | EXPORT_SYMBOL_GPL(ping_hash); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 75 | |
| 76 | static inline struct hlist_nulls_head *ping_hashslot(struct ping_table *table, |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 77 | struct net *net, unsigned int num) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 78 | { |
| 79 | return &table->hash[ping_hashfn(net, num, PING_HTABLE_MASK)]; |
| 80 | } |
| 81 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 82 | int ping_get_port(struct sock *sk, unsigned short ident) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 83 | { |
| 84 | struct hlist_nulls_node *node; |
| 85 | struct hlist_nulls_head *hlist; |
| 86 | struct inet_sock *isk, *isk2; |
| 87 | struct sock *sk2 = NULL; |
| 88 | |
| 89 | isk = inet_sk(sk); |
| 90 | write_lock_bh(&ping_table.lock); |
| 91 | if (ident == 0) { |
| 92 | u32 i; |
| 93 | u16 result = ping_port_rover + 1; |
| 94 | |
| 95 | for (i = 0; i < (1L << 16); i++, result++) { |
| 96 | if (!result) |
| 97 | result++; /* avoid zero */ |
| 98 | hlist = ping_hashslot(&ping_table, sock_net(sk), |
| 99 | result); |
| 100 | ping_portaddr_for_each_entry(sk2, node, hlist) { |
| 101 | isk2 = inet_sk(sk2); |
| 102 | |
| 103 | if (isk2->inet_num == result) |
| 104 | goto next_port; |
| 105 | } |
| 106 | |
| 107 | /* found */ |
| 108 | ping_port_rover = ident = result; |
| 109 | break; |
| 110 | next_port: |
| 111 | ; |
| 112 | } |
| 113 | if (i >= (1L << 16)) |
| 114 | goto fail; |
| 115 | } else { |
| 116 | hlist = ping_hashslot(&ping_table, sock_net(sk), ident); |
| 117 | ping_portaddr_for_each_entry(sk2, node, hlist) { |
| 118 | isk2 = inet_sk(sk2); |
| 119 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 120 | /* BUG? Why is this reuse and not reuseaddr? ping.c |
| 121 | * doesn't turn off SO_REUSEADDR, and it doesn't expect |
| 122 | * that other ping processes can steal its packets. |
| 123 | */ |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 124 | if ((isk2->inet_num == ident) && |
| 125 | (sk2 != sk) && |
| 126 | (!sk2->sk_reuse || !sk->sk_reuse)) |
| 127 | goto fail; |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | pr_debug("found port/ident = %d\n", ident); |
| 132 | isk->inet_num = ident; |
| 133 | if (sk_unhashed(sk)) { |
| 134 | pr_debug("was not hashed\n"); |
| 135 | sock_hold(sk); |
| 136 | hlist_nulls_add_head(&sk->sk_nulls_node, hlist); |
| 137 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
| 138 | } |
| 139 | write_unlock_bh(&ping_table.lock); |
| 140 | return 0; |
| 141 | |
| 142 | fail: |
| 143 | write_unlock_bh(&ping_table.lock); |
| 144 | return 1; |
| 145 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 146 | EXPORT_SYMBOL_GPL(ping_get_port); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 147 | |
Craig Gallek | 086c653 | 2016-02-10 11:50:35 -0500 | [diff] [blame] | 148 | int ping_hash(struct sock *sk) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 149 | { |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 150 | pr_debug("ping_hash(sk->port=%u)\n", inet_sk(sk)->inet_num); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 151 | BUG(); /* "Please do not press this button again." */ |
Craig Gallek | 086c653 | 2016-02-10 11:50:35 -0500 | [diff] [blame] | 152 | |
| 153 | return 0; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 154 | } |
| 155 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 156 | void ping_unhash(struct sock *sk) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 157 | { |
| 158 | struct inet_sock *isk = inet_sk(sk); |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 159 | pr_debug("ping_unhash(isk=%p,isk->num=%u)\n", isk, isk->inet_num); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 160 | if (sk_hashed(sk)) { |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 161 | write_lock_bh(&ping_table.lock); |
| 162 | hlist_nulls_del(&sk->sk_nulls_node); |
David S. Miller | a134f08 | 2015-05-01 22:02:47 -0400 | [diff] [blame] | 163 | sk_nulls_node_init(&sk->sk_nulls_node); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 164 | sock_put(sk); |
Eric Dumazet | 747465e | 2012-01-16 19:27:39 +0000 | [diff] [blame] | 165 | isk->inet_num = 0; |
| 166 | isk->inet_sport = 0; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 167 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
| 168 | write_unlock_bh(&ping_table.lock); |
| 169 | } |
| 170 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 171 | EXPORT_SYMBOL_GPL(ping_unhash); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 172 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 173 | static struct sock *ping_lookup(struct net *net, struct sk_buff *skb, u16 ident) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 174 | { |
| 175 | struct hlist_nulls_head *hslot = ping_hashslot(&ping_table, net, ident); |
| 176 | struct sock *sk = NULL; |
| 177 | struct inet_sock *isk; |
| 178 | struct hlist_nulls_node *hnode; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 179 | int dif = skb->dev->ifindex; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 180 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 181 | if (skb->protocol == htons(ETH_P_IP)) { |
| 182 | pr_debug("try to find: num = %d, daddr = %pI4, dif = %d\n", |
| 183 | (int)ident, &ip_hdr(skb)->daddr, dif); |
| 184 | #if IS_ENABLED(CONFIG_IPV6) |
| 185 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 186 | pr_debug("try to find: num = %d, daddr = %pI6c, dif = %d\n", |
| 187 | (int)ident, &ipv6_hdr(skb)->daddr, dif); |
| 188 | #endif |
| 189 | } |
| 190 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 191 | read_lock_bh(&ping_table.lock); |
| 192 | |
| 193 | ping_portaddr_for_each_entry(sk, hnode, hslot) { |
| 194 | isk = inet_sk(sk); |
| 195 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 196 | pr_debug("iterate\n"); |
| 197 | if (isk->inet_num != ident) |
| 198 | continue; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 199 | |
| 200 | if (skb->protocol == htons(ETH_P_IP) && |
| 201 | sk->sk_family == AF_INET) { |
| 202 | pr_debug("found: %p: num=%d, daddr=%pI4, dif=%d\n", sk, |
| 203 | (int) isk->inet_num, &isk->inet_rcv_saddr, |
| 204 | sk->sk_bound_dev_if); |
| 205 | |
| 206 | if (isk->inet_rcv_saddr && |
| 207 | isk->inet_rcv_saddr != ip_hdr(skb)->daddr) |
| 208 | continue; |
| 209 | #if IS_ENABLED(CONFIG_IPV6) |
| 210 | } else if (skb->protocol == htons(ETH_P_IPV6) && |
| 211 | sk->sk_family == AF_INET6) { |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 212 | |
| 213 | pr_debug("found: %p: num=%d, daddr=%pI6c, dif=%d\n", sk, |
| 214 | (int) isk->inet_num, |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 215 | &sk->sk_v6_rcv_saddr, |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 216 | sk->sk_bound_dev_if); |
| 217 | |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 218 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
| 219 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 220 | &ipv6_hdr(skb)->daddr)) |
| 221 | continue; |
| 222 | #endif |
Jane Zhou | 91a0b60 | 2014-11-24 11:44:08 -0800 | [diff] [blame] | 223 | } else { |
| 224 | continue; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 225 | } |
| 226 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 227 | if (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) |
| 228 | continue; |
| 229 | |
| 230 | sock_hold(sk); |
| 231 | goto exit; |
| 232 | } |
| 233 | |
| 234 | sk = NULL; |
| 235 | exit: |
| 236 | read_unlock_bh(&ping_table.lock); |
| 237 | |
| 238 | return sk; |
| 239 | } |
| 240 | |
Eric W. Biederman | 7064d16 | 2012-05-24 10:34:21 -0600 | [diff] [blame] | 241 | static void inet_get_ping_group_range_net(struct net *net, kgid_t *low, |
| 242 | kgid_t *high) |
Vasiliy Kulikov | f56e03e | 2011-05-17 00:16:56 +0000 | [diff] [blame] | 243 | { |
Cong Wang | ba6b918 | 2014-05-06 11:02:50 -0700 | [diff] [blame] | 244 | kgid_t *data = net->ipv4.ping_group_range.range; |
Eric Dumazet | 95c9617 | 2012-04-15 05:58:06 +0000 | [diff] [blame] | 245 | unsigned int seq; |
| 246 | |
Vasiliy Kulikov | f56e03e | 2011-05-17 00:16:56 +0000 | [diff] [blame] | 247 | do { |
Cong Wang | ba6b918 | 2014-05-06 11:02:50 -0700 | [diff] [blame] | 248 | seq = read_seqbegin(&net->ipv4.ping_group_range.lock); |
Vasiliy Kulikov | f56e03e | 2011-05-17 00:16:56 +0000 | [diff] [blame] | 249 | |
| 250 | *low = data[0]; |
| 251 | *high = data[1]; |
Cong Wang | ba6b918 | 2014-05-06 11:02:50 -0700 | [diff] [blame] | 252 | } while (read_seqretry(&net->ipv4.ping_group_range.lock, seq)); |
Vasiliy Kulikov | f56e03e | 2011-05-17 00:16:56 +0000 | [diff] [blame] | 253 | } |
| 254 | |
| 255 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 256 | int ping_init_sock(struct sock *sk) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 257 | { |
| 258 | struct net *net = sock_net(sk); |
Eric W. Biederman | 7064d16 | 2012-05-24 10:34:21 -0600 | [diff] [blame] | 259 | kgid_t group = current_egid(); |
Wang, Xiaoming | b04c461 | 2014-04-14 12:30:45 -0400 | [diff] [blame] | 260 | struct group_info *group_info; |
| 261 | int i, j, count; |
Eric W. Biederman | ae2975b | 2011-11-14 15:56:38 -0800 | [diff] [blame] | 262 | kgid_t low, high; |
Wang, Xiaoming | b04c461 | 2014-04-14 12:30:45 -0400 | [diff] [blame] | 263 | int ret = 0; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 264 | |
Lorenzo Colitti | 9145736 | 2015-03-03 23:16:16 +0900 | [diff] [blame] | 265 | if (sk->sk_family == AF_INET6) |
| 266 | sk->sk_ipv6only = 1; |
| 267 | |
Eric W. Biederman | 7064d16 | 2012-05-24 10:34:21 -0600 | [diff] [blame] | 268 | inet_get_ping_group_range_net(net, &low, &high); |
| 269 | if (gid_lte(low, group) && gid_lte(group, high)) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 270 | return 0; |
| 271 | |
Wang, Xiaoming | b04c461 | 2014-04-14 12:30:45 -0400 | [diff] [blame] | 272 | group_info = get_current_groups(); |
| 273 | count = group_info->ngroups; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 274 | for (i = 0; i < group_info->nblocks; i++) { |
| 275 | int cp_count = min_t(int, NGROUPS_PER_BLOCK, count); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 276 | for (j = 0; j < cp_count; j++) { |
Eric W. Biederman | ae2975b | 2011-11-14 15:56:38 -0800 | [diff] [blame] | 277 | kgid_t gid = group_info->blocks[i][j]; |
| 278 | if (gid_lte(low, gid) && gid_lte(gid, high)) |
Wang, Xiaoming | b04c461 | 2014-04-14 12:30:45 -0400 | [diff] [blame] | 279 | goto out_release_group; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 280 | } |
| 281 | |
| 282 | count -= cp_count; |
| 283 | } |
| 284 | |
Wang, Xiaoming | b04c461 | 2014-04-14 12:30:45 -0400 | [diff] [blame] | 285 | ret = -EACCES; |
| 286 | |
| 287 | out_release_group: |
| 288 | put_group_info(group_info); |
| 289 | return ret; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 290 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 291 | EXPORT_SYMBOL_GPL(ping_init_sock); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 292 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 293 | void ping_close(struct sock *sk, long timeout) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 294 | { |
| 295 | pr_debug("ping_close(sk=%p,sk->num=%u)\n", |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 296 | inet_sk(sk), inet_sk(sk)->inet_num); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 297 | pr_debug("isk->refcnt = %d\n", sk->sk_refcnt.counter); |
| 298 | |
| 299 | sk_common_release(sk); |
| 300 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 301 | EXPORT_SYMBOL_GPL(ping_close); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 302 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 303 | /* Checks the bind address and possibly modifies sk->sk_bound_dev_if. */ |
Wu Fengguang | a06a2d3 | 2013-06-12 21:04:16 +0800 | [diff] [blame] | 304 | static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk, |
| 305 | struct sockaddr *uaddr, int addr_len) { |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 306 | struct net *net = sock_net(sk); |
| 307 | if (sk->sk_family == AF_INET) { |
| 308 | struct sockaddr_in *addr = (struct sockaddr_in *) uaddr; |
| 309 | int chk_addr_ret; |
| 310 | |
| 311 | if (addr_len < sizeof(*addr)) |
| 312 | return -EINVAL; |
| 313 | |
Lorenzo Colitti | 9145736 | 2015-03-03 23:16:16 +0900 | [diff] [blame] | 314 | if (addr->sin_family != AF_INET && |
| 315 | !(addr->sin_family == AF_UNSPEC && |
| 316 | addr->sin_addr.s_addr == htonl(INADDR_ANY))) |
| 317 | return -EAFNOSUPPORT; |
| 318 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 319 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n", |
| 320 | sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port)); |
| 321 | |
| 322 | chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr); |
| 323 | |
| 324 | if (addr->sin_addr.s_addr == htonl(INADDR_ANY)) |
| 325 | chk_addr_ret = RTN_LOCAL; |
| 326 | |
Vincent Bernat | 49a6015 | 2014-09-05 15:09:03 +0200 | [diff] [blame] | 327 | if ((net->ipv4.sysctl_ip_nonlocal_bind == 0 && |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 328 | isk->freebind == 0 && isk->transparent == 0 && |
| 329 | chk_addr_ret != RTN_LOCAL) || |
| 330 | chk_addr_ret == RTN_MULTICAST || |
| 331 | chk_addr_ret == RTN_BROADCAST) |
| 332 | return -EADDRNOTAVAIL; |
| 333 | |
| 334 | #if IS_ENABLED(CONFIG_IPV6) |
| 335 | } else if (sk->sk_family == AF_INET6) { |
| 336 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr; |
| 337 | int addr_type, scoped, has_addr; |
| 338 | struct net_device *dev = NULL; |
| 339 | |
| 340 | if (addr_len < sizeof(*addr)) |
| 341 | return -EINVAL; |
| 342 | |
Hannes Frederic Sowa | 82b276c | 2014-01-20 05:16:39 +0100 | [diff] [blame] | 343 | if (addr->sin6_family != AF_INET6) |
Lorenzo Colitti | 9145736 | 2015-03-03 23:16:16 +0900 | [diff] [blame] | 344 | return -EAFNOSUPPORT; |
Hannes Frederic Sowa | 82b276c | 2014-01-20 05:16:39 +0100 | [diff] [blame] | 345 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 346 | pr_debug("ping_check_bind_addr(sk=%p,addr=%pI6c,port=%d)\n", |
| 347 | sk, addr->sin6_addr.s6_addr, ntohs(addr->sin6_port)); |
| 348 | |
| 349 | addr_type = ipv6_addr_type(&addr->sin6_addr); |
| 350 | scoped = __ipv6_addr_needs_scope_id(addr_type); |
| 351 | if ((addr_type != IPV6_ADDR_ANY && |
| 352 | !(addr_type & IPV6_ADDR_UNICAST)) || |
| 353 | (scoped && !addr->sin6_scope_id)) |
| 354 | return -EINVAL; |
| 355 | |
| 356 | rcu_read_lock(); |
| 357 | if (addr->sin6_scope_id) { |
| 358 | dev = dev_get_by_index_rcu(net, addr->sin6_scope_id); |
| 359 | if (!dev) { |
| 360 | rcu_read_unlock(); |
| 361 | return -ENODEV; |
| 362 | } |
| 363 | } |
| 364 | has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev, |
| 365 | scoped); |
| 366 | rcu_read_unlock(); |
| 367 | |
Tom Herbert | 35a256f | 2015-07-08 16:58:22 -0700 | [diff] [blame] | 368 | if (!(net->ipv6.sysctl.ip_nonlocal_bind || |
| 369 | isk->freebind || isk->transparent || has_addr || |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 370 | addr_type == IPV6_ADDR_ANY)) |
| 371 | return -EADDRNOTAVAIL; |
| 372 | |
| 373 | if (scoped) |
| 374 | sk->sk_bound_dev_if = addr->sin6_scope_id; |
| 375 | #endif |
| 376 | } else { |
| 377 | return -EAFNOSUPPORT; |
| 378 | } |
| 379 | return 0; |
| 380 | } |
| 381 | |
Wu Fengguang | a06a2d3 | 2013-06-12 21:04:16 +0800 | [diff] [blame] | 382 | static void ping_set_saddr(struct sock *sk, struct sockaddr *saddr) |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 383 | { |
| 384 | if (saddr->sa_family == AF_INET) { |
| 385 | struct inet_sock *isk = inet_sk(sk); |
| 386 | struct sockaddr_in *addr = (struct sockaddr_in *) saddr; |
| 387 | isk->inet_rcv_saddr = isk->inet_saddr = addr->sin_addr.s_addr; |
| 388 | #if IS_ENABLED(CONFIG_IPV6) |
| 389 | } else if (saddr->sa_family == AF_INET6) { |
| 390 | struct sockaddr_in6 *addr = (struct sockaddr_in6 *) saddr; |
| 391 | struct ipv6_pinfo *np = inet6_sk(sk); |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 392 | sk->sk_v6_rcv_saddr = np->saddr = addr->sin6_addr; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 393 | #endif |
| 394 | } |
| 395 | } |
| 396 | |
Wu Fengguang | a06a2d3 | 2013-06-12 21:04:16 +0800 | [diff] [blame] | 397 | static void ping_clear_saddr(struct sock *sk, int dif) |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 398 | { |
| 399 | sk->sk_bound_dev_if = dif; |
| 400 | if (sk->sk_family == AF_INET) { |
| 401 | struct inet_sock *isk = inet_sk(sk); |
| 402 | isk->inet_rcv_saddr = isk->inet_saddr = 0; |
| 403 | #if IS_ENABLED(CONFIG_IPV6) |
| 404 | } else if (sk->sk_family == AF_INET6) { |
| 405 | struct ipv6_pinfo *np = inet6_sk(sk); |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 406 | memset(&sk->sk_v6_rcv_saddr, 0, sizeof(sk->sk_v6_rcv_saddr)); |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 407 | memset(&np->saddr, 0, sizeof(np->saddr)); |
| 408 | #endif |
| 409 | } |
| 410 | } |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 411 | /* |
| 412 | * We need our own bind because there are no privileged id's == local ports. |
| 413 | * Moreover, we don't allow binding to multi- and broadcast addresses. |
| 414 | */ |
| 415 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 416 | int ping_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 417 | { |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 418 | struct inet_sock *isk = inet_sk(sk); |
| 419 | unsigned short snum; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 420 | int err; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 421 | int dif = sk->sk_bound_dev_if; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 422 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 423 | err = ping_check_bind_addr(sk, isk, uaddr, addr_len); |
| 424 | if (err) |
| 425 | return err; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 426 | |
| 427 | lock_sock(sk); |
| 428 | |
| 429 | err = -EINVAL; |
| 430 | if (isk->inet_num != 0) |
| 431 | goto out; |
| 432 | |
| 433 | err = -EADDRINUSE; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 434 | ping_set_saddr(sk, uaddr); |
| 435 | snum = ntohs(((struct sockaddr_in *)uaddr)->sin_port); |
| 436 | if (ping_get_port(sk, snum) != 0) { |
| 437 | ping_clear_saddr(sk, dif); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 438 | goto out; |
| 439 | } |
| 440 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 441 | pr_debug("after bind(): num = %d, dif = %d\n", |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 442 | (int)isk->inet_num, |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 443 | (int)sk->sk_bound_dev_if); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 444 | |
| 445 | err = 0; |
Eric Dumazet | c2bb06d | 2013-10-09 03:05:48 -0700 | [diff] [blame] | 446 | if (sk->sk_family == AF_INET && isk->inet_rcv_saddr) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 447 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
Eric Dumazet | c2bb06d | 2013-10-09 03:05:48 -0700 | [diff] [blame] | 448 | #if IS_ENABLED(CONFIG_IPV6) |
| 449 | if (sk->sk_family == AF_INET6 && !ipv6_addr_any(&sk->sk_v6_rcv_saddr)) |
| 450 | sk->sk_userlocks |= SOCK_BINDADDR_LOCK; |
| 451 | #endif |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 452 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 453 | if (snum) |
| 454 | sk->sk_userlocks |= SOCK_BINDPORT_LOCK; |
| 455 | isk->inet_sport = htons(isk->inet_num); |
| 456 | isk->inet_daddr = 0; |
| 457 | isk->inet_dport = 0; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 458 | |
| 459 | #if IS_ENABLED(CONFIG_IPV6) |
| 460 | if (sk->sk_family == AF_INET6) |
Eric Dumazet | efe4208 | 2013-10-03 15:42:29 -0700 | [diff] [blame] | 461 | memset(&sk->sk_v6_daddr, 0, sizeof(sk->sk_v6_daddr)); |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 462 | #endif |
| 463 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 464 | sk_dst_reset(sk); |
| 465 | out: |
| 466 | release_sock(sk); |
| 467 | pr_debug("ping_v4_bind -> %d\n", err); |
| 468 | return err; |
| 469 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 470 | EXPORT_SYMBOL_GPL(ping_bind); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 471 | |
| 472 | /* |
| 473 | * Is this a supported type of ICMP message? |
| 474 | */ |
| 475 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 476 | static inline int ping_supported(int family, int type, int code) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 477 | { |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 478 | return (family == AF_INET && type == ICMP_ECHO && code == 0) || |
| 479 | (family == AF_INET6 && type == ICMPV6_ECHO_REQUEST && code == 0); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 480 | } |
| 481 | |
| 482 | /* |
| 483 | * This routine is called by the ICMP module when it gets some |
| 484 | * sort of error condition. |
| 485 | */ |
| 486 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 487 | void ping_err(struct sk_buff *skb, int offset, u32 info) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 488 | { |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 489 | int family; |
| 490 | struct icmphdr *icmph; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 491 | struct inet_sock *inet_sock; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 492 | int type; |
| 493 | int code; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 494 | struct net *net = dev_net(skb->dev); |
| 495 | struct sock *sk; |
| 496 | int harderr; |
| 497 | int err; |
| 498 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 499 | if (skb->protocol == htons(ETH_P_IP)) { |
| 500 | family = AF_INET; |
| 501 | type = icmp_hdr(skb)->type; |
| 502 | code = icmp_hdr(skb)->code; |
| 503 | icmph = (struct icmphdr *)(skb->data + offset); |
| 504 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 505 | family = AF_INET6; |
| 506 | type = icmp6_hdr(skb)->icmp6_type; |
| 507 | code = icmp6_hdr(skb)->icmp6_code; |
| 508 | icmph = (struct icmphdr *) (skb->data + offset); |
| 509 | } else { |
| 510 | BUG(); |
| 511 | } |
| 512 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 513 | /* We assume the packet has already been checked by icmp_unreach */ |
| 514 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 515 | if (!ping_supported(family, icmph->type, icmph->code)) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 516 | return; |
| 517 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 518 | pr_debug("ping_err(proto=0x%x,type=%d,code=%d,id=%04x,seq=%04x)\n", |
| 519 | skb->protocol, type, code, ntohs(icmph->un.echo.id), |
| 520 | ntohs(icmph->un.echo.sequence)); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 521 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 522 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
Ian Morris | 51456b2 | 2015-04-03 09:17:26 +0100 | [diff] [blame] | 523 | if (!sk) { |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 524 | pr_debug("no socket, dropping\n"); |
| 525 | return; /* No socket for error */ |
| 526 | } |
| 527 | pr_debug("err on socket %p\n", sk); |
| 528 | |
| 529 | err = 0; |
| 530 | harderr = 0; |
| 531 | inet_sock = inet_sk(sk); |
| 532 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 533 | if (skb->protocol == htons(ETH_P_IP)) { |
| 534 | switch (type) { |
| 535 | default: |
| 536 | case ICMP_TIME_EXCEEDED: |
| 537 | err = EHOSTUNREACH; |
| 538 | break; |
| 539 | case ICMP_SOURCE_QUENCH: |
| 540 | /* This is not a real error but ping wants to see it. |
| 541 | * Report it with some fake errno. |
| 542 | */ |
| 543 | err = EREMOTEIO; |
| 544 | break; |
| 545 | case ICMP_PARAMETERPROB: |
| 546 | err = EPROTO; |
| 547 | harderr = 1; |
| 548 | break; |
| 549 | case ICMP_DEST_UNREACH: |
| 550 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ |
| 551 | ipv4_sk_update_pmtu(skb, sk, info); |
| 552 | if (inet_sock->pmtudisc != IP_PMTUDISC_DONT) { |
| 553 | err = EMSGSIZE; |
| 554 | harderr = 1; |
| 555 | break; |
| 556 | } |
| 557 | goto out; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 558 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 559 | err = EHOSTUNREACH; |
| 560 | if (code <= NR_ICMP_UNREACH) { |
| 561 | harderr = icmp_err_convert[code].fatal; |
| 562 | err = icmp_err_convert[code].errno; |
| 563 | } |
| 564 | break; |
| 565 | case ICMP_REDIRECT: |
| 566 | /* See ICMP_SOURCE_QUENCH */ |
| 567 | ipv4_sk_redirect(skb, sk); |
| 568 | err = EREMOTEIO; |
| 569 | break; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 570 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 571 | #if IS_ENABLED(CONFIG_IPV6) |
| 572 | } else if (skb->protocol == htons(ETH_P_IPV6)) { |
| 573 | harderr = pingv6_ops.icmpv6_err_convert(type, code, &err); |
| 574 | #endif |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 575 | } |
| 576 | |
| 577 | /* |
| 578 | * RFC1122: OK. Passes ICMP errors back to application, as per |
| 579 | * 4.1.3.3. |
| 580 | */ |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 581 | if ((family == AF_INET && !inet_sock->recverr) || |
| 582 | (family == AF_INET6 && !inet6_sk(sk)->recverr)) { |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 583 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
| 584 | goto out; |
| 585 | } else { |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 586 | if (family == AF_INET) { |
| 587 | ip_icmp_error(sk, skb, err, 0 /* no remote port */, |
| 588 | info, (u8 *)icmph); |
| 589 | #if IS_ENABLED(CONFIG_IPV6) |
| 590 | } else if (family == AF_INET6) { |
| 591 | pingv6_ops.ipv6_icmp_error(sk, skb, err, 0, |
| 592 | info, (u8 *)icmph); |
| 593 | #endif |
| 594 | } |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 595 | } |
| 596 | sk->sk_err = err; |
| 597 | sk->sk_error_report(sk); |
| 598 | out: |
| 599 | sock_put(sk); |
| 600 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 601 | EXPORT_SYMBOL_GPL(ping_err); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 602 | |
| 603 | /* |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 604 | * Copy and checksum an ICMP Echo packet from user space into a buffer |
| 605 | * starting from the payload. |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 606 | */ |
| 607 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 608 | int ping_getfrag(void *from, char *to, |
| 609 | int offset, int fraglen, int odd, struct sk_buff *skb) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 610 | { |
| 611 | struct pingfakehdr *pfh = (struct pingfakehdr *)from; |
| 612 | |
| 613 | if (offset == 0) { |
Al Viro | 21226ab | 2014-11-28 15:48:29 -0500 | [diff] [blame] | 614 | fraglen -= sizeof(struct icmphdr); |
| 615 | if (fraglen < 0) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 616 | BUG(); |
Al Viro | 21226ab | 2014-11-28 15:48:29 -0500 | [diff] [blame] | 617 | if (csum_and_copy_from_iter(to + sizeof(struct icmphdr), |
| 618 | fraglen, &pfh->wcheck, |
| 619 | &pfh->msg->msg_iter) != fraglen) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 620 | return -EFAULT; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 621 | } else if (offset < sizeof(struct icmphdr)) { |
| 622 | BUG(); |
| 623 | } else { |
Al Viro | 21226ab | 2014-11-28 15:48:29 -0500 | [diff] [blame] | 624 | if (csum_and_copy_from_iter(to, fraglen, &pfh->wcheck, |
| 625 | &pfh->msg->msg_iter) != fraglen) |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 626 | return -EFAULT; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 627 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 628 | |
| 629 | #if IS_ENABLED(CONFIG_IPV6) |
| 630 | /* For IPv6, checksum each skb as we go along, as expected by |
| 631 | * icmpv6_push_pending_frames. For IPv4, accumulate the checksum in |
| 632 | * wcheck, it will be finalized in ping_v4_push_pending_frames. |
| 633 | */ |
| 634 | if (pfh->family == AF_INET6) { |
| 635 | skb->csum = pfh->wcheck; |
| 636 | skb->ip_summed = CHECKSUM_NONE; |
| 637 | pfh->wcheck = 0; |
| 638 | } |
| 639 | #endif |
| 640 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 641 | return 0; |
| 642 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 643 | EXPORT_SYMBOL_GPL(ping_getfrag); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 644 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 645 | static int ping_v4_push_pending_frames(struct sock *sk, struct pingfakehdr *pfh, |
| 646 | struct flowi4 *fl4) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 647 | { |
| 648 | struct sk_buff *skb = skb_peek(&sk->sk_write_queue); |
| 649 | |
| 650 | pfh->wcheck = csum_partial((char *)&pfh->icmph, |
| 651 | sizeof(struct icmphdr), pfh->wcheck); |
| 652 | pfh->icmph.checksum = csum_fold(pfh->wcheck); |
| 653 | memcpy(icmp_hdr(skb), &pfh->icmph, sizeof(struct icmphdr)); |
| 654 | skb->ip_summed = CHECKSUM_NONE; |
| 655 | return ip_push_pending_frames(sk, fl4); |
| 656 | } |
| 657 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 658 | int ping_common_sendmsg(int family, struct msghdr *msg, size_t len, |
| 659 | void *user_icmph, size_t icmph_len) { |
| 660 | u8 type, code; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 661 | |
| 662 | if (len > 0xFFFF) |
| 663 | return -EMSGSIZE; |
| 664 | |
| 665 | /* |
| 666 | * Check the flags. |
| 667 | */ |
| 668 | |
| 669 | /* Mirror BSD error message compatibility */ |
| 670 | if (msg->msg_flags & MSG_OOB) |
| 671 | return -EOPNOTSUPP; |
| 672 | |
| 673 | /* |
| 674 | * Fetch the ICMP header provided by the userland. |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 675 | * iovec is modified! The ICMP header is consumed. |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 676 | */ |
Al Viro | 6ce8e9c | 2014-04-06 21:25:44 -0400 | [diff] [blame] | 677 | if (memcpy_from_msg(user_icmph, msg, icmph_len)) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 678 | return -EFAULT; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 679 | |
| 680 | if (family == AF_INET) { |
| 681 | type = ((struct icmphdr *) user_icmph)->type; |
| 682 | code = ((struct icmphdr *) user_icmph)->code; |
| 683 | #if IS_ENABLED(CONFIG_IPV6) |
| 684 | } else if (family == AF_INET6) { |
| 685 | type = ((struct icmp6hdr *) user_icmph)->icmp6_type; |
| 686 | code = ((struct icmp6hdr *) user_icmph)->icmp6_code; |
| 687 | #endif |
| 688 | } else { |
| 689 | BUG(); |
| 690 | } |
| 691 | |
| 692 | if (!ping_supported(family, type, code)) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 693 | return -EINVAL; |
| 694 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 695 | return 0; |
| 696 | } |
| 697 | EXPORT_SYMBOL_GPL(ping_common_sendmsg); |
| 698 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 699 | static int ping_v4_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 700 | { |
| 701 | struct net *net = sock_net(sk); |
| 702 | struct flowi4 fl4; |
| 703 | struct inet_sock *inet = inet_sk(sk); |
| 704 | struct ipcm_cookie ipc; |
| 705 | struct icmphdr user_icmph; |
| 706 | struct pingfakehdr pfh; |
| 707 | struct rtable *rt = NULL; |
| 708 | struct ip_options_data opt_copy; |
| 709 | int free = 0; |
| 710 | __be32 saddr, daddr, faddr; |
| 711 | u8 tos; |
| 712 | int err; |
| 713 | |
| 714 | pr_debug("ping_v4_sendmsg(sk=%p,sk->num=%u)\n", inet, inet->inet_num); |
| 715 | |
| 716 | err = ping_common_sendmsg(AF_INET, msg, len, &user_icmph, |
| 717 | sizeof(user_icmph)); |
| 718 | if (err) |
| 719 | return err; |
| 720 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 721 | /* |
| 722 | * Get and verify the address. |
| 723 | */ |
| 724 | |
| 725 | if (msg->msg_name) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 726 | DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 727 | if (msg->msg_namelen < sizeof(*usin)) |
| 728 | return -EINVAL; |
| 729 | if (usin->sin_family != AF_INET) |
Lorenzo Colitti | 9145736 | 2015-03-03 23:16:16 +0900 | [diff] [blame] | 730 | return -EAFNOSUPPORT; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 731 | daddr = usin->sin_addr.s_addr; |
| 732 | /* no remote port */ |
| 733 | } else { |
| 734 | if (sk->sk_state != TCP_ESTABLISHED) |
| 735 | return -EDESTADDRREQ; |
| 736 | daddr = inet->inet_daddr; |
| 737 | /* no remote port */ |
| 738 | } |
| 739 | |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 740 | ipc.sockc.tsflags = sk->sk_tsflags; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 741 | ipc.addr = inet->inet_saddr; |
| 742 | ipc.opt = NULL; |
| 743 | ipc.oif = sk->sk_bound_dev_if; |
| 744 | ipc.tx_flags = 0; |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 745 | ipc.ttl = 0; |
| 746 | ipc.tos = -1; |
Daniel Borkmann | bf84a01 | 2013-04-14 08:08:13 +0000 | [diff] [blame] | 747 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 748 | if (msg->msg_controllen) { |
Soheil Hassas Yeganeh | 24025c4 | 2016-04-02 23:08:10 -0400 | [diff] [blame] | 749 | err = ip_cmsg_send(sk, msg, &ipc, false); |
Eric Dumazet | 9194830 | 2016-02-04 06:23:28 -0800 | [diff] [blame] | 750 | if (unlikely(err)) { |
| 751 | kfree(ipc.opt); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 752 | return err; |
Eric Dumazet | 9194830 | 2016-02-04 06:23:28 -0800 | [diff] [blame] | 753 | } |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 754 | if (ipc.opt) |
| 755 | free = 1; |
| 756 | } |
| 757 | if (!ipc.opt) { |
| 758 | struct ip_options_rcu *inet_opt; |
| 759 | |
| 760 | rcu_read_lock(); |
| 761 | inet_opt = rcu_dereference(inet->inet_opt); |
| 762 | if (inet_opt) { |
| 763 | memcpy(&opt_copy, inet_opt, |
| 764 | sizeof(*inet_opt) + inet_opt->opt.optlen); |
| 765 | ipc.opt = &opt_copy.opt; |
| 766 | } |
| 767 | rcu_read_unlock(); |
| 768 | } |
| 769 | |
Soheil Hassas Yeganeh | c14ac94 | 2016-04-02 23:08:12 -0400 | [diff] [blame] | 770 | sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags); |
| 771 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 772 | saddr = ipc.addr; |
| 773 | ipc.addr = faddr = daddr; |
| 774 | |
| 775 | if (ipc.opt && ipc.opt->opt.srr) { |
| 776 | if (!daddr) |
| 777 | return -EINVAL; |
| 778 | faddr = ipc.opt->opt.faddr; |
| 779 | } |
Francesco Fusco | aa66158 | 2013-09-24 15:43:09 +0200 | [diff] [blame] | 780 | tos = get_rttos(&ipc, inet); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 781 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
| 782 | (msg->msg_flags & MSG_DONTROUTE) || |
| 783 | (ipc.opt && ipc.opt->opt.is_strictroute)) { |
| 784 | tos |= RTO_ONLINK; |
| 785 | } |
| 786 | |
| 787 | if (ipv4_is_multicast(daddr)) { |
| 788 | if (!ipc.oif) |
| 789 | ipc.oif = inet->mc_index; |
| 790 | if (!saddr) |
| 791 | saddr = inet->mc_addr; |
Erich E. Hoover | 76e2105 | 2012-02-08 09:11:07 +0000 | [diff] [blame] | 792 | } else if (!ipc.oif) |
| 793 | ipc.oif = inet->uc_index; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 794 | |
| 795 | flowi4_init_output(&fl4, ipc.oif, sk->sk_mark, tos, |
| 796 | RT_SCOPE_UNIVERSE, sk->sk_protocol, |
| 797 | inet_sk_flowi_flags(sk), faddr, saddr, 0, 0); |
| 798 | |
| 799 | security_sk_classify_flow(sk, flowi4_to_flowi(&fl4)); |
| 800 | rt = ip_route_output_flow(net, &fl4, sk); |
| 801 | if (IS_ERR(rt)) { |
| 802 | err = PTR_ERR(rt); |
| 803 | rt = NULL; |
| 804 | if (err == -ENETUNREACH) |
Eric Dumazet | f1d8cba | 2013-11-28 09:51:22 -0800 | [diff] [blame] | 805 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 806 | goto out; |
| 807 | } |
| 808 | |
| 809 | err = -EACCES; |
| 810 | if ((rt->rt_flags & RTCF_BROADCAST) && |
| 811 | !sock_flag(sk, SOCK_BROADCAST)) |
| 812 | goto out; |
| 813 | |
| 814 | if (msg->msg_flags & MSG_CONFIRM) |
| 815 | goto do_confirm; |
| 816 | back_from_confirm: |
| 817 | |
| 818 | if (!ipc.addr) |
| 819 | ipc.addr = fl4.daddr; |
| 820 | |
| 821 | lock_sock(sk); |
| 822 | |
| 823 | pfh.icmph.type = user_icmph.type; /* already checked */ |
| 824 | pfh.icmph.code = user_icmph.code; /* ditto */ |
| 825 | pfh.icmph.checksum = 0; |
| 826 | pfh.icmph.un.echo.id = inet->inet_sport; |
| 827 | pfh.icmph.un.echo.sequence = user_icmph.un.echo.sequence; |
Al Viro | cacdc7d | 2014-11-27 20:34:16 -0500 | [diff] [blame] | 828 | pfh.msg = msg; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 829 | pfh.wcheck = 0; |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 830 | pfh.family = AF_INET; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 831 | |
| 832 | err = ip_append_data(sk, &fl4, ping_getfrag, &pfh, len, |
| 833 | 0, &ipc, &rt, msg->msg_flags); |
| 834 | if (err) |
| 835 | ip_flush_pending_frames(sk); |
| 836 | else |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 837 | err = ping_v4_push_pending_frames(sk, &pfh, &fl4); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 838 | release_sock(sk); |
| 839 | |
| 840 | out: |
| 841 | ip_rt_put(rt); |
| 842 | if (free) |
| 843 | kfree(ipc.opt); |
| 844 | if (!err) { |
| 845 | icmp_out_count(sock_net(sk), user_icmph.type); |
| 846 | return len; |
| 847 | } |
| 848 | return err; |
| 849 | |
| 850 | do_confirm: |
| 851 | dst_confirm(&rt->dst); |
| 852 | if (!(msg->msg_flags & MSG_PROBE) || len) |
| 853 | goto back_from_confirm; |
| 854 | err = 0; |
| 855 | goto out; |
| 856 | } |
| 857 | |
Ying Xue | 1b78414 | 2015-03-02 15:37:48 +0800 | [diff] [blame] | 858 | int ping_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
| 859 | int flags, int *addr_len) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 860 | { |
| 861 | struct inet_sock *isk = inet_sk(sk); |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 862 | int family = sk->sk_family; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 863 | struct sk_buff *skb; |
| 864 | int copied, err; |
| 865 | |
| 866 | pr_debug("ping_recvmsg(sk=%p,sk->num=%u)\n", isk, isk->inet_num); |
| 867 | |
David S. Miller | a5e7424 | 2012-02-21 17:59:19 -0500 | [diff] [blame] | 868 | err = -EOPNOTSUPP; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 869 | if (flags & MSG_OOB) |
| 870 | goto out; |
| 871 | |
Willem de Bruijn | f4713a3 | 2014-11-26 14:53:02 -0500 | [diff] [blame] | 872 | if (flags & MSG_ERRQUEUE) |
| 873 | return inet_recv_error(sk, msg, len, addr_len); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 874 | |
| 875 | skb = skb_recv_datagram(sk, flags, noblock, &err); |
| 876 | if (!skb) |
| 877 | goto out; |
| 878 | |
| 879 | copied = skb->len; |
| 880 | if (copied > len) { |
| 881 | msg->msg_flags |= MSG_TRUNC; |
| 882 | copied = len; |
| 883 | } |
| 884 | |
| 885 | /* Don't bother checking the checksum */ |
David S. Miller | 51f3d02 | 2014-11-05 16:46:40 -0500 | [diff] [blame] | 886 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 887 | if (err) |
| 888 | goto done; |
| 889 | |
| 890 | sock_recv_timestamp(msg, sk, skb); |
| 891 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 892 | /* Copy the address and add cmsg data. */ |
| 893 | if (family == AF_INET) { |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 894 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
Hannes Frederic Sowa | bceaa90 | 2013-11-18 04:20:45 +0100 | [diff] [blame] | 895 | |
Hannes Frederic Sowa | cf970c0 | 2013-11-18 07:07:45 +0100 | [diff] [blame] | 896 | if (sin) { |
| 897 | sin->sin_family = AF_INET; |
| 898 | sin->sin_port = 0 /* skb->h.uh->source */; |
| 899 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; |
| 900 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
| 901 | *addr_len = sizeof(*sin); |
| 902 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 903 | |
| 904 | if (isk->cmsg_flags) |
| 905 | ip_cmsg_recv(msg, skb); |
| 906 | |
| 907 | #if IS_ENABLED(CONFIG_IPV6) |
| 908 | } else if (family == AF_INET6) { |
| 909 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 910 | struct ipv6hdr *ip6 = ipv6_hdr(skb); |
Steffen Hurrle | 342dfc3 | 2014-01-17 22:53:15 +0100 | [diff] [blame] | 911 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 912 | |
Hannes Frederic Sowa | cf970c0 | 2013-11-18 07:07:45 +0100 | [diff] [blame] | 913 | if (sin6) { |
| 914 | sin6->sin6_family = AF_INET6; |
| 915 | sin6->sin6_port = 0; |
| 916 | sin6->sin6_addr = ip6->saddr; |
| 917 | sin6->sin6_flowinfo = 0; |
| 918 | if (np->sndflow) |
| 919 | sin6->sin6_flowinfo = ip6_flowinfo(ip6); |
| 920 | sin6->sin6_scope_id = |
| 921 | ipv6_iface_scope_id(&sin6->sin6_addr, |
Duan Jiong | 4330487 | 2014-08-01 09:52:58 +0800 | [diff] [blame] | 922 | inet6_iif(skb)); |
Hannes Frederic Sowa | cf970c0 | 2013-11-18 07:07:45 +0100 | [diff] [blame] | 923 | *addr_len = sizeof(*sin6); |
| 924 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 925 | |
| 926 | if (inet6_sk(sk)->rxopt.all) |
Hannes Frederic Sowa | 4b261c7 | 2014-01-20 03:43:08 +0100 | [diff] [blame] | 927 | pingv6_ops.ip6_datagram_recv_common_ctl(sk, msg, skb); |
| 928 | if (skb->protocol == htons(ETH_P_IPV6) && |
| 929 | inet6_sk(sk)->rxopt.all) |
| 930 | pingv6_ops.ip6_datagram_recv_specific_ctl(sk, msg, skb); |
| 931 | else if (skb->protocol == htons(ETH_P_IP) && isk->cmsg_flags) |
| 932 | ip_cmsg_recv(msg, skb); |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 933 | #endif |
| 934 | } else { |
| 935 | BUG(); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 936 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 937 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 938 | err = copied; |
| 939 | |
| 940 | done: |
| 941 | skb_free_datagram(sk, skb); |
| 942 | out: |
| 943 | pr_debug("ping_recvmsg -> %d\n", err); |
| 944 | return err; |
| 945 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 946 | EXPORT_SYMBOL_GPL(ping_recvmsg); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 947 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 948 | int ping_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 949 | { |
| 950 | pr_debug("ping_queue_rcv_skb(sk=%p,sk->num=%d,skb=%p)\n", |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 951 | inet_sk(sk), inet_sk(sk)->inet_num, skb); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 952 | if (sock_queue_rcv_skb(sk, skb) < 0) { |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 953 | kfree_skb(skb); |
| 954 | pr_debug("ping_queue_rcv_skb -> failed\n"); |
| 955 | return -1; |
| 956 | } |
| 957 | return 0; |
| 958 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 959 | EXPORT_SYMBOL_GPL(ping_queue_rcv_skb); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 960 | |
| 961 | |
| 962 | /* |
| 963 | * All we need to do is get the socket. |
| 964 | */ |
| 965 | |
Rick Jones | e3e3217 | 2014-11-17 14:04:29 -0800 | [diff] [blame] | 966 | bool ping_rcv(struct sk_buff *skb) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 967 | { |
| 968 | struct sock *sk; |
| 969 | struct net *net = dev_net(skb->dev); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 970 | struct icmphdr *icmph = icmp_hdr(skb); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 971 | |
| 972 | /* We assume the packet has already been checked by icmp_rcv */ |
| 973 | |
| 974 | pr_debug("ping_rcv(skb=%p,id=%04x,seq=%04x)\n", |
Joe Perches | 058bd4d | 2012-03-11 18:36:11 +0000 | [diff] [blame] | 975 | skb, ntohs(icmph->un.echo.id), ntohs(icmph->un.echo.sequence)); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 976 | |
| 977 | /* Push ICMP header back */ |
| 978 | skb_push(skb, skb->data - (u8 *)icmph); |
| 979 | |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 980 | sk = ping_lookup(net, skb, ntohs(icmph->un.echo.id)); |
Ian Morris | 00db412 | 2015-04-03 09:17:27 +0100 | [diff] [blame] | 981 | if (sk) { |
subashab@codeaurora.org | fc752f1 | 2015-01-23 22:26:02 +0000 | [diff] [blame] | 982 | struct sk_buff *skb2 = skb_clone(skb, GFP_ATOMIC); |
| 983 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 984 | pr_debug("rcv on socket %p\n", sk); |
subashab@codeaurora.org | fc752f1 | 2015-01-23 22:26:02 +0000 | [diff] [blame] | 985 | if (skb2) |
| 986 | ping_queue_rcv_skb(sk, skb2); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 987 | sock_put(sk); |
Rick Jones | e3e3217 | 2014-11-17 14:04:29 -0800 | [diff] [blame] | 988 | return true; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 989 | } |
| 990 | pr_debug("no socket, dropping\n"); |
| 991 | |
Rick Jones | e3e3217 | 2014-11-17 14:04:29 -0800 | [diff] [blame] | 992 | return false; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 993 | } |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 994 | EXPORT_SYMBOL_GPL(ping_rcv); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 995 | |
| 996 | struct proto ping_prot = { |
| 997 | .name = "PING", |
| 998 | .owner = THIS_MODULE, |
| 999 | .init = ping_init_sock, |
| 1000 | .close = ping_close, |
| 1001 | .connect = ip4_datagram_connect, |
| 1002 | .disconnect = udp_disconnect, |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1003 | .setsockopt = ip_setsockopt, |
| 1004 | .getsockopt = ip_getsockopt, |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 1005 | .sendmsg = ping_v4_sendmsg, |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1006 | .recvmsg = ping_recvmsg, |
| 1007 | .bind = ping_bind, |
| 1008 | .backlog_rcv = ping_queue_rcv_skb, |
Steffen Klassert | 8141ed9 | 2013-01-21 02:00:03 +0000 | [diff] [blame] | 1009 | .release_cb = ip4_datagram_release_cb, |
Lorenzo Colitti | 6d0bfe2 | 2013-05-22 20:17:31 +0000 | [diff] [blame] | 1010 | .hash = ping_hash, |
| 1011 | .unhash = ping_unhash, |
| 1012 | .get_port = ping_get_port, |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1013 | .obj_size = sizeof(struct inet_sock), |
| 1014 | }; |
| 1015 | EXPORT_SYMBOL(ping_prot); |
| 1016 | |
| 1017 | #ifdef CONFIG_PROC_FS |
| 1018 | |
| 1019 | static struct sock *ping_get_first(struct seq_file *seq, int start) |
| 1020 | { |
| 1021 | struct sock *sk; |
| 1022 | struct ping_iter_state *state = seq->private; |
| 1023 | struct net *net = seq_file_net(seq); |
| 1024 | |
| 1025 | for (state->bucket = start; state->bucket < PING_HTABLE_SIZE; |
| 1026 | ++state->bucket) { |
| 1027 | struct hlist_nulls_node *node; |
Changli Gao | 75e308c | 2011-05-18 21:16:01 +0000 | [diff] [blame] | 1028 | struct hlist_nulls_head *hslot; |
| 1029 | |
| 1030 | hslot = &ping_table.hash[state->bucket]; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1031 | |
| 1032 | if (hlist_nulls_empty(hslot)) |
| 1033 | continue; |
| 1034 | |
| 1035 | sk_nulls_for_each(sk, node, hslot) { |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1036 | if (net_eq(sock_net(sk), net) && |
| 1037 | sk->sk_family == state->family) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1038 | goto found; |
| 1039 | } |
| 1040 | } |
| 1041 | sk = NULL; |
| 1042 | found: |
| 1043 | return sk; |
| 1044 | } |
| 1045 | |
| 1046 | static struct sock *ping_get_next(struct seq_file *seq, struct sock *sk) |
| 1047 | { |
| 1048 | struct ping_iter_state *state = seq->private; |
| 1049 | struct net *net = seq_file_net(seq); |
| 1050 | |
| 1051 | do { |
| 1052 | sk = sk_nulls_next(sk); |
| 1053 | } while (sk && (!net_eq(sock_net(sk), net))); |
| 1054 | |
| 1055 | if (!sk) |
| 1056 | return ping_get_first(seq, state->bucket + 1); |
| 1057 | return sk; |
| 1058 | } |
| 1059 | |
| 1060 | static struct sock *ping_get_idx(struct seq_file *seq, loff_t pos) |
| 1061 | { |
| 1062 | struct sock *sk = ping_get_first(seq, 0); |
| 1063 | |
| 1064 | if (sk) |
| 1065 | while (pos && (sk = ping_get_next(seq, sk)) != NULL) |
| 1066 | --pos; |
| 1067 | return pos ? NULL : sk; |
| 1068 | } |
| 1069 | |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1070 | void *ping_seq_start(struct seq_file *seq, loff_t *pos, sa_family_t family) |
Lance Richardson | ad64b8b | 2016-01-06 17:22:47 -0500 | [diff] [blame] | 1071 | __acquires(ping_table.lock) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1072 | { |
| 1073 | struct ping_iter_state *state = seq->private; |
| 1074 | state->bucket = 0; |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1075 | state->family = family; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1076 | |
| 1077 | read_lock_bh(&ping_table.lock); |
| 1078 | |
| 1079 | return *pos ? ping_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
| 1080 | } |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1081 | EXPORT_SYMBOL_GPL(ping_seq_start); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1082 | |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1083 | static void *ping_v4_seq_start(struct seq_file *seq, loff_t *pos) |
| 1084 | { |
| 1085 | return ping_seq_start(seq, pos, AF_INET); |
| 1086 | } |
| 1087 | |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1088 | void *ping_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1089 | { |
| 1090 | struct sock *sk; |
| 1091 | |
| 1092 | if (v == SEQ_START_TOKEN) |
| 1093 | sk = ping_get_idx(seq, 0); |
| 1094 | else |
| 1095 | sk = ping_get_next(seq, v); |
| 1096 | |
| 1097 | ++*pos; |
| 1098 | return sk; |
| 1099 | } |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1100 | EXPORT_SYMBOL_GPL(ping_seq_next); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1101 | |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1102 | void ping_seq_stop(struct seq_file *seq, void *v) |
Lance Richardson | ad64b8b | 2016-01-06 17:22:47 -0500 | [diff] [blame] | 1103 | __releases(ping_table.lock) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1104 | { |
| 1105 | read_unlock_bh(&ping_table.lock); |
| 1106 | } |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1107 | EXPORT_SYMBOL_GPL(ping_seq_stop); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1108 | |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1109 | static void ping_v4_format_sock(struct sock *sp, struct seq_file *f, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 1110 | int bucket) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1111 | { |
| 1112 | struct inet_sock *inet = inet_sk(sp); |
| 1113 | __be32 dest = inet->inet_daddr; |
| 1114 | __be32 src = inet->inet_rcv_saddr; |
| 1115 | __u16 destp = ntohs(inet->inet_dport); |
| 1116 | __u16 srcp = ntohs(inet->inet_sport); |
| 1117 | |
| 1118 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 1119 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d", |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1120 | bucket, src, srcp, dest, destp, sp->sk_state, |
| 1121 | sk_wmem_alloc_get(sp), |
| 1122 | sk_rmem_alloc_get(sp), |
Eric W. Biederman | a7cb5a4 | 2012-05-24 01:10:10 -0600 | [diff] [blame] | 1123 | 0, 0L, 0, |
| 1124 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), |
| 1125 | 0, sock_i_ino(sp), |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1126 | atomic_read(&sp->sk_refcnt), sp, |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 1127 | atomic_read(&sp->sk_drops)); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1128 | } |
| 1129 | |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1130 | static int ping_v4_seq_show(struct seq_file *seq, void *v) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1131 | { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 1132 | seq_setwidth(seq, 127); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1133 | if (v == SEQ_START_TOKEN) |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 1134 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1135 | "rx_queue tr tm->when retrnsmt uid timeout " |
| 1136 | "inode ref pointer drops"); |
| 1137 | else { |
| 1138 | struct ping_iter_state *state = seq->private; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1139 | |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 1140 | ping_v4_format_sock(v, seq, state->bucket); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1141 | } |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 1142 | seq_pad(seq, '\n'); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1143 | return 0; |
| 1144 | } |
| 1145 | |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1146 | static int ping_seq_open(struct inode *inode, struct file *file) |
| 1147 | { |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1148 | struct ping_seq_afinfo *afinfo = PDE_DATA(inode); |
| 1149 | return seq_open_net(inode, file, &afinfo->seq_ops, |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1150 | sizeof(struct ping_iter_state)); |
| 1151 | } |
| 1152 | |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1153 | const struct file_operations ping_seq_fops = { |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1154 | .open = ping_seq_open, |
| 1155 | .read = seq_read, |
| 1156 | .llseek = seq_lseek, |
| 1157 | .release = seq_release_net, |
| 1158 | }; |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1159 | EXPORT_SYMBOL_GPL(ping_seq_fops); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1160 | |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1161 | static struct ping_seq_afinfo ping_v4_seq_afinfo = { |
| 1162 | .name = "icmp", |
| 1163 | .family = AF_INET, |
| 1164 | .seq_fops = &ping_seq_fops, |
| 1165 | .seq_ops = { |
| 1166 | .start = ping_v4_seq_start, |
| 1167 | .show = ping_v4_seq_show, |
| 1168 | .next = ping_seq_next, |
| 1169 | .stop = ping_seq_stop, |
| 1170 | }, |
| 1171 | }; |
| 1172 | |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1173 | int ping_proc_register(struct net *net, struct ping_seq_afinfo *afinfo) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1174 | { |
| 1175 | struct proc_dir_entry *p; |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1176 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
| 1177 | afinfo->seq_fops, afinfo); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1178 | if (!p) |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1179 | return -ENOMEM; |
| 1180 | return 0; |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1181 | } |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1182 | EXPORT_SYMBOL_GPL(ping_proc_register); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1183 | |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1184 | void ping_proc_unregister(struct net *net, struct ping_seq_afinfo *afinfo) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1185 | { |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1186 | remove_proc_entry(afinfo->name, net->proc_net); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1187 | } |
Lorenzo Colitti | d862e54 | 2013-05-31 15:05:50 +0000 | [diff] [blame] | 1188 | EXPORT_SYMBOL_GPL(ping_proc_unregister); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1189 | |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1190 | static int __net_init ping_v4_proc_init_net(struct net *net) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1191 | { |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1192 | return ping_proc_register(net, &ping_v4_seq_afinfo); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1193 | } |
| 1194 | |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1195 | static void __net_exit ping_v4_proc_exit_net(struct net *net) |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1196 | { |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1197 | ping_proc_unregister(net, &ping_v4_seq_afinfo); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1198 | } |
| 1199 | |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1200 | static struct pernet_operations ping_v4_net_ops = { |
| 1201 | .init = ping_v4_proc_init_net, |
| 1202 | .exit = ping_v4_proc_exit_net, |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1203 | }; |
| 1204 | |
| 1205 | int __init ping_proc_init(void) |
| 1206 | { |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1207 | return register_pernet_subsys(&ping_v4_net_ops); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1208 | } |
| 1209 | |
| 1210 | void ping_proc_exit(void) |
| 1211 | { |
Lorenzo Colitti | 8cc785f | 2013-05-31 15:05:49 +0000 | [diff] [blame] | 1212 | unregister_pernet_subsys(&ping_v4_net_ops); |
Vasiliy Kulikov | c319b4d | 2011-05-13 10:01:00 +0000 | [diff] [blame] | 1213 | } |
| 1214 | |
| 1215 | #endif |
| 1216 | |
| 1217 | void __init ping_init(void) |
| 1218 | { |
| 1219 | int i; |
| 1220 | |
| 1221 | for (i = 0; i < PING_HTABLE_SIZE; i++) |
| 1222 | INIT_HLIST_NULLS_HEAD(&ping_table.hash[i], i); |
| 1223 | rwlock_init(&ping_table.lock); |
| 1224 | } |