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Commit | Line | Data |
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1da177e4 LT |
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 | * The User Datagram Protocol (UDP). | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> | |
113aa838 | 11 | * Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
12 | * Hirokazu Takahashi, <taka@valinux.co.jp> |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : verify_area() calls | |
16 | * Alan Cox : stopped close while in use off icmp | |
17 | * messages. Not a fix but a botch that | |
18 | * for udp at least is 'valid'. | |
19 | * Alan Cox : Fixed icmp handling properly | |
20 | * Alan Cox : Correct error for oversized datagrams | |
e905a9ed YH |
21 | * Alan Cox : Tidied select() semantics. |
22 | * Alan Cox : udp_err() fixed properly, also now | |
1da177e4 LT |
23 | * select and read wake correctly on errors |
24 | * Alan Cox : udp_send verify_area moved to avoid mem leak | |
25 | * Alan Cox : UDP can count its memory | |
26 | * Alan Cox : send to an unknown connection causes | |
27 | * an ECONNREFUSED off the icmp, but | |
28 | * does NOT close. | |
29 | * Alan Cox : Switched to new sk_buff handlers. No more backlog! | |
30 | * Alan Cox : Using generic datagram code. Even smaller and the PEEK | |
31 | * bug no longer crashes it. | |
32 | * Fred Van Kempen : Net2e support for sk->broadcast. | |
33 | * Alan Cox : Uses skb_free_datagram | |
34 | * Alan Cox : Added get/set sockopt support. | |
35 | * Alan Cox : Broadcasting without option set returns EACCES. | |
36 | * Alan Cox : No wakeup calls. Instead we now use the callbacks. | |
37 | * Alan Cox : Use ip_tos and ip_ttl | |
38 | * Alan Cox : SNMP Mibs | |
39 | * Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support. | |
40 | * Matt Dillon : UDP length checks. | |
41 | * Alan Cox : Smarter af_inet used properly. | |
42 | * Alan Cox : Use new kernel side addressing. | |
43 | * Alan Cox : Incorrect return on truncated datagram receive. | |
44 | * Arnt Gulbrandsen : New udp_send and stuff | |
45 | * Alan Cox : Cache last socket | |
46 | * Alan Cox : Route cache | |
47 | * Jon Peatfield : Minor efficiency fix to sendto(). | |
48 | * Mike Shaver : RFC1122 checks. | |
49 | * Alan Cox : Nonblocking error fix. | |
50 | * Willy Konynenberg : Transparent proxying support. | |
51 | * Mike McLagan : Routing by source | |
52 | * David S. Miller : New socket lookup architecture. | |
53 | * Last socket cache retained as it | |
54 | * does have a high hit rate. | |
55 | * Olaf Kirch : Don't linearise iovec on sendmsg. | |
56 | * Andi Kleen : Some cleanups, cache destination entry | |
e905a9ed | 57 | * for connect. |
1da177e4 LT |
58 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. |
59 | * Melvin Smith : Check msg_name not msg_namelen in sendto(), | |
60 | * return ENOTCONN for unconnected sockets (POSIX) | |
61 | * Janos Farkas : don't deliver multi/broadcasts to a different | |
62 | * bound-to-device socket | |
63 | * Hirokazu Takahashi : HW checksumming for outgoing UDP | |
64 | * datagrams. | |
65 | * Hirokazu Takahashi : sendfile() on UDP works now. | |
66 | * Arnaldo C. Melo : convert /proc/net/udp to seq_file | |
67 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
68 | * Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind | |
69 | * a single port at the same time. | |
70 | * Derek Atkins <derek@ihtfp.com>: Add Encapulation Support | |
342f0234 | 71 | * James Chapman : Add L2TP encapsulation type. |
1da177e4 LT |
72 | * |
73 | * | |
74 | * This program is free software; you can redistribute it and/or | |
75 | * modify it under the terms of the GNU General Public License | |
76 | * as published by the Free Software Foundation; either version | |
77 | * 2 of the License, or (at your option) any later version. | |
78 | */ | |
e905a9ed | 79 | |
afd46503 JP |
80 | #define pr_fmt(fmt) "UDP: " fmt |
81 | ||
1da177e4 LT |
82 | #include <asm/uaccess.h> |
83 | #include <asm/ioctls.h> | |
95766fff | 84 | #include <linux/bootmem.h> |
8203efb3 ED |
85 | #include <linux/highmem.h> |
86 | #include <linux/swap.h> | |
1da177e4 LT |
87 | #include <linux/types.h> |
88 | #include <linux/fcntl.h> | |
89 | #include <linux/module.h> | |
90 | #include <linux/socket.h> | |
91 | #include <linux/sockios.h> | |
14c85021 | 92 | #include <linux/igmp.h> |
6e540309 | 93 | #include <linux/inetdevice.h> |
1da177e4 LT |
94 | #include <linux/in.h> |
95 | #include <linux/errno.h> | |
96 | #include <linux/timer.h> | |
97 | #include <linux/mm.h> | |
1da177e4 | 98 | #include <linux/inet.h> |
1da177e4 | 99 | #include <linux/netdevice.h> |
5a0e3ad6 | 100 | #include <linux/slab.h> |
c752f073 | 101 | #include <net/tcp_states.h> |
1da177e4 LT |
102 | #include <linux/skbuff.h> |
103 | #include <linux/proc_fs.h> | |
104 | #include <linux/seq_file.h> | |
457c4cbc | 105 | #include <net/net_namespace.h> |
1da177e4 | 106 | #include <net/icmp.h> |
421b3885 | 107 | #include <net/inet_hashtables.h> |
1da177e4 | 108 | #include <net/route.h> |
1da177e4 LT |
109 | #include <net/checksum.h> |
110 | #include <net/xfrm.h> | |
296f7ea7 | 111 | #include <trace/events/udp.h> |
447167bf | 112 | #include <linux/static_key.h> |
22911fc5 | 113 | #include <trace/events/skb.h> |
076bb0c8 | 114 | #include <net/busy_poll.h> |
ba4e58ec | 115 | #include "udp_impl.h" |
e32ea7e7 | 116 | #include <net/sock_reuseport.h> |
217375a0 | 117 | #include <net/addrconf.h> |
1da177e4 | 118 | |
f86dcc5a | 119 | struct udp_table udp_table __read_mostly; |
645ca708 | 120 | EXPORT_SYMBOL(udp_table); |
1da177e4 | 121 | |
8d987e5c | 122 | long sysctl_udp_mem[3] __read_mostly; |
95766fff | 123 | EXPORT_SYMBOL(sysctl_udp_mem); |
c482c568 ED |
124 | |
125 | int sysctl_udp_rmem_min __read_mostly; | |
95766fff | 126 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
c482c568 ED |
127 | |
128 | int sysctl_udp_wmem_min __read_mostly; | |
95766fff HA |
129 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
130 | ||
8d987e5c | 131 | atomic_long_t udp_memory_allocated; |
95766fff HA |
132 | EXPORT_SYMBOL(udp_memory_allocated); |
133 | ||
f86dcc5a ED |
134 | #define MAX_UDP_PORTS 65536 |
135 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) | |
98322f22 | 136 | |
f24d43c0 | 137 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
645ca708 | 138 | const struct udp_hslot *hslot, |
98322f22 | 139 | unsigned long *bitmap, |
f24d43c0 ED |
140 | struct sock *sk, |
141 | int (*saddr_comp)(const struct sock *sk1, | |
e32ea7e7 CG |
142 | const struct sock *sk2, |
143 | bool match_wildcard), | |
f86dcc5a | 144 | unsigned int log) |
1da177e4 | 145 | { |
f24d43c0 | 146 | struct sock *sk2; |
ba418fa3 | 147 | kuid_t uid = sock_i_uid(sk); |
25030a7f | 148 | |
ca065d0c | 149 | sk_for_each(sk2, &hslot->head) { |
9d4fb27d JP |
150 | if (net_eq(sock_net(sk2), net) && |
151 | sk2 != sk && | |
d4cada4a | 152 | (bitmap || udp_sk(sk2)->udp_port_hash == num) && |
9d4fb27d JP |
153 | (!sk2->sk_reuse || !sk->sk_reuse) && |
154 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
155 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
ba418fa3 | 156 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
e32ea7e7 | 157 | rcu_access_pointer(sk->sk_reuseport_cb) || |
4243cdc2 | 158 | !uid_eq(uid, sock_i_uid(sk2))) && |
e32ea7e7 | 159 | saddr_comp(sk, sk2, true)) { |
4243cdc2 | 160 | if (!bitmap) |
98322f22 | 161 | return 1; |
4243cdc2 | 162 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, bitmap); |
98322f22 | 163 | } |
4243cdc2 | 164 | } |
25030a7f GR |
165 | return 0; |
166 | } | |
167 | ||
30fff923 ED |
168 | /* |
169 | * Note: we still hold spinlock of primary hash chain, so no other writer | |
170 | * can insert/delete a socket with local_port == num | |
171 | */ | |
172 | static int udp_lib_lport_inuse2(struct net *net, __u16 num, | |
4243cdc2 JP |
173 | struct udp_hslot *hslot2, |
174 | struct sock *sk, | |
175 | int (*saddr_comp)(const struct sock *sk1, | |
e32ea7e7 CG |
176 | const struct sock *sk2, |
177 | bool match_wildcard)) | |
30fff923 ED |
178 | { |
179 | struct sock *sk2; | |
ba418fa3 | 180 | kuid_t uid = sock_i_uid(sk); |
30fff923 ED |
181 | int res = 0; |
182 | ||
183 | spin_lock(&hslot2->lock); | |
ca065d0c | 184 | udp_portaddr_for_each_entry(sk2, &hslot2->head) { |
9d4fb27d JP |
185 | if (net_eq(sock_net(sk2), net) && |
186 | sk2 != sk && | |
187 | (udp_sk(sk2)->udp_port_hash == num) && | |
188 | (!sk2->sk_reuse || !sk->sk_reuse) && | |
189 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
190 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
ba418fa3 | 191 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
e32ea7e7 | 192 | rcu_access_pointer(sk->sk_reuseport_cb) || |
4243cdc2 | 193 | !uid_eq(uid, sock_i_uid(sk2))) && |
e32ea7e7 | 194 | saddr_comp(sk, sk2, true)) { |
30fff923 ED |
195 | res = 1; |
196 | break; | |
197 | } | |
4243cdc2 | 198 | } |
30fff923 ED |
199 | spin_unlock(&hslot2->lock); |
200 | return res; | |
201 | } | |
202 | ||
e32ea7e7 CG |
203 | static int udp_reuseport_add_sock(struct sock *sk, struct udp_hslot *hslot, |
204 | int (*saddr_same)(const struct sock *sk1, | |
205 | const struct sock *sk2, | |
206 | bool match_wildcard)) | |
207 | { | |
208 | struct net *net = sock_net(sk); | |
e32ea7e7 CG |
209 | kuid_t uid = sock_i_uid(sk); |
210 | struct sock *sk2; | |
211 | ||
ca065d0c | 212 | sk_for_each(sk2, &hslot->head) { |
e32ea7e7 CG |
213 | if (net_eq(sock_net(sk2), net) && |
214 | sk2 != sk && | |
215 | sk2->sk_family == sk->sk_family && | |
216 | ipv6_only_sock(sk2) == ipv6_only_sock(sk) && | |
217 | (udp_sk(sk2)->udp_port_hash == udp_sk(sk)->udp_port_hash) && | |
218 | (sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
219 | sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) && | |
220 | (*saddr_same)(sk, sk2, false)) { | |
221 | return reuseport_add_sock(sk, sk2); | |
222 | } | |
223 | } | |
224 | ||
225 | /* Initial allocation may have already happened via setsockopt */ | |
226 | if (!rcu_access_pointer(sk->sk_reuseport_cb)) | |
227 | return reuseport_alloc(sk); | |
228 | return 0; | |
229 | } | |
230 | ||
25030a7f | 231 | /** |
6ba5a3c5 | 232 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
25030a7f GR |
233 | * |
234 | * @sk: socket struct in question | |
235 | * @snum: port number to look up | |
df2bc459 | 236 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
25985edc | 237 | * @hash2_nulladdr: AF-dependent hash value in secondary hash chains, |
30fff923 | 238 | * with NULL address |
25030a7f | 239 | */ |
6ba5a3c5 | 240 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
4243cdc2 | 241 | int (*saddr_comp)(const struct sock *sk1, |
e32ea7e7 CG |
242 | const struct sock *sk2, |
243 | bool match_wildcard), | |
30fff923 | 244 | unsigned int hash2_nulladdr) |
25030a7f | 245 | { |
512615b6 | 246 | struct udp_hslot *hslot, *hslot2; |
645ca708 | 247 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
25030a7f | 248 | int error = 1; |
3b1e0a65 | 249 | struct net *net = sock_net(sk); |
1da177e4 | 250 | |
32c1da70 | 251 | if (!snum) { |
9088c560 | 252 | int low, high, remaining; |
95c96174 | 253 | unsigned int rand; |
98322f22 ED |
254 | unsigned short first, last; |
255 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); | |
32c1da70 | 256 | |
0bbf87d8 | 257 | inet_get_local_port_range(net, &low, &high); |
a25de534 | 258 | remaining = (high - low) + 1; |
227b60f5 | 259 | |
63862b5b | 260 | rand = prandom_u32(); |
8fc54f68 | 261 | first = reciprocal_scale(rand, remaining) + low; |
98322f22 ED |
262 | /* |
263 | * force rand to be an odd multiple of UDP_HTABLE_SIZE | |
264 | */ | |
f86dcc5a | 265 | rand = (rand | 1) * (udptable->mask + 1); |
5781b235 ED |
266 | last = first + udptable->mask + 1; |
267 | do { | |
f86dcc5a | 268 | hslot = udp_hashslot(udptable, net, first); |
98322f22 | 269 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
645ca708 | 270 | spin_lock_bh(&hslot->lock); |
98322f22 | 271 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
f86dcc5a | 272 | saddr_comp, udptable->log); |
98322f22 ED |
273 | |
274 | snum = first; | |
275 | /* | |
276 | * Iterate on all possible values of snum for this hash. | |
277 | * Using steps of an odd multiple of UDP_HTABLE_SIZE | |
278 | * give us randomization and full range coverage. | |
279 | */ | |
9088c560 | 280 | do { |
98322f22 | 281 | if (low <= snum && snum <= high && |
e3826f1e | 282 | !test_bit(snum >> udptable->log, bitmap) && |
122ff243 | 283 | !inet_is_local_reserved_port(net, snum)) |
98322f22 ED |
284 | goto found; |
285 | snum += rand; | |
286 | } while (snum != first); | |
287 | spin_unlock_bh(&hslot->lock); | |
5781b235 | 288 | } while (++first != last); |
98322f22 | 289 | goto fail; |
645ca708 | 290 | } else { |
f86dcc5a | 291 | hslot = udp_hashslot(udptable, net, snum); |
645ca708 | 292 | spin_lock_bh(&hslot->lock); |
30fff923 ED |
293 | if (hslot->count > 10) { |
294 | int exist; | |
295 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; | |
296 | ||
297 | slot2 &= udptable->mask; | |
298 | hash2_nulladdr &= udptable->mask; | |
299 | ||
300 | hslot2 = udp_hashslot2(udptable, slot2); | |
301 | if (hslot->count < hslot2->count) | |
302 | goto scan_primary_hash; | |
303 | ||
304 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
305 | sk, saddr_comp); | |
306 | if (!exist && (hash2_nulladdr != slot2)) { | |
307 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); | |
308 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
309 | sk, saddr_comp); | |
310 | } | |
311 | if (exist) | |
312 | goto fail_unlock; | |
313 | else | |
314 | goto found; | |
315 | } | |
316 | scan_primary_hash: | |
f86dcc5a ED |
317 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
318 | saddr_comp, 0)) | |
645ca708 ED |
319 | goto fail_unlock; |
320 | } | |
98322f22 | 321 | found: |
c720c7e8 | 322 | inet_sk(sk)->inet_num = snum; |
d4cada4a ED |
323 | udp_sk(sk)->udp_port_hash = snum; |
324 | udp_sk(sk)->udp_portaddr_hash ^= snum; | |
1da177e4 | 325 | if (sk_unhashed(sk)) { |
e32ea7e7 CG |
326 | if (sk->sk_reuseport && |
327 | udp_reuseport_add_sock(sk, hslot, saddr_comp)) { | |
328 | inet_sk(sk)->inet_num = 0; | |
329 | udp_sk(sk)->udp_port_hash = 0; | |
330 | udp_sk(sk)->udp_portaddr_hash ^= snum; | |
331 | goto fail_unlock; | |
332 | } | |
333 | ||
ca065d0c | 334 | sk_add_node_rcu(sk, &hslot->head); |
fdcc8aa9 | 335 | hslot->count++; |
c29a0bc4 | 336 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
512615b6 ED |
337 | |
338 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
339 | spin_lock(&hslot2->lock); | |
d894ba18 | 340 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
1602f49b DM |
341 | sk->sk_family == AF_INET6) |
342 | hlist_add_tail_rcu(&udp_sk(sk)->udp_portaddr_node, | |
343 | &hslot2->head); | |
d894ba18 | 344 | else |
1602f49b DM |
345 | hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
346 | &hslot2->head); | |
512615b6 ED |
347 | hslot2->count++; |
348 | spin_unlock(&hslot2->lock); | |
1da177e4 | 349 | } |
ca065d0c | 350 | sock_set_flag(sk, SOCK_RCU_FREE); |
25030a7f | 351 | error = 0; |
645ca708 ED |
352 | fail_unlock: |
353 | spin_unlock_bh(&hslot->lock); | |
1da177e4 | 354 | fail: |
25030a7f GR |
355 | return error; |
356 | } | |
c482c568 | 357 | EXPORT_SYMBOL(udp_lib_get_port); |
25030a7f | 358 | |
e32ea7e7 CG |
359 | /* match_wildcard == true: 0.0.0.0 equals to any IPv4 addresses |
360 | * match_wildcard == false: addresses must be exactly the same, i.e. | |
361 | * 0.0.0.0 only equals to 0.0.0.0 | |
362 | */ | |
c125e80b CG |
363 | int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2, |
364 | bool match_wildcard) | |
db8dac20 DM |
365 | { |
366 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); | |
367 | ||
e32ea7e7 CG |
368 | if (!ipv6_only_sock(sk2)) { |
369 | if (inet1->inet_rcv_saddr == inet2->inet_rcv_saddr) | |
370 | return 1; | |
371 | if (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr) | |
372 | return match_wildcard; | |
373 | } | |
374 | return 0; | |
db8dac20 DM |
375 | } |
376 | ||
6eada011 ED |
377 | static u32 udp4_portaddr_hash(const struct net *net, __be32 saddr, |
378 | unsigned int port) | |
d4cada4a | 379 | { |
0eae88f3 | 380 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
d4cada4a ED |
381 | } |
382 | ||
6ba5a3c5 | 383 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
db8dac20 | 384 | { |
30fff923 | 385 | unsigned int hash2_nulladdr = |
0eae88f3 | 386 | udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum); |
30fff923 ED |
387 | unsigned int hash2_partial = |
388 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); | |
389 | ||
d4cada4a | 390 | /* precompute partial secondary hash */ |
30fff923 ED |
391 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
392 | return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr); | |
db8dac20 DM |
393 | } |
394 | ||
d1e37288 SX |
395 | static int compute_score(struct sock *sk, struct net *net, |
396 | __be32 saddr, __be16 sport, | |
397 | __be32 daddr, unsigned short hnum, int dif) | |
645ca708 | 398 | { |
60c04aec JP |
399 | int score; |
400 | struct inet_sock *inet; | |
645ca708 | 401 | |
60c04aec JP |
402 | if (!net_eq(sock_net(sk), net) || |
403 | udp_sk(sk)->udp_port_hash != hnum || | |
404 | ipv6_only_sock(sk)) | |
405 | return -1; | |
645ca708 | 406 | |
60c04aec JP |
407 | score = (sk->sk_family == PF_INET) ? 2 : 1; |
408 | inet = inet_sk(sk); | |
409 | ||
410 | if (inet->inet_rcv_saddr) { | |
411 | if (inet->inet_rcv_saddr != daddr) | |
412 | return -1; | |
413 | score += 4; | |
645ca708 | 414 | } |
60c04aec JP |
415 | |
416 | if (inet->inet_daddr) { | |
417 | if (inet->inet_daddr != saddr) | |
418 | return -1; | |
419 | score += 4; | |
420 | } | |
421 | ||
422 | if (inet->inet_dport) { | |
423 | if (inet->inet_dport != sport) | |
424 | return -1; | |
425 | score += 4; | |
426 | } | |
427 | ||
428 | if (sk->sk_bound_dev_if) { | |
429 | if (sk->sk_bound_dev_if != dif) | |
430 | return -1; | |
431 | score += 4; | |
432 | } | |
70da268b ED |
433 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
434 | score++; | |
645ca708 ED |
435 | return score; |
436 | } | |
437 | ||
6eada011 ED |
438 | static u32 udp_ehashfn(const struct net *net, const __be32 laddr, |
439 | const __u16 lport, const __be32 faddr, | |
440 | const __be16 fport) | |
65cd8033 | 441 | { |
1bbdceef HFS |
442 | static u32 udp_ehash_secret __read_mostly; |
443 | ||
444 | net_get_random_once(&udp_ehash_secret, sizeof(udp_ehash_secret)); | |
445 | ||
65cd8033 | 446 | return __inet_ehashfn(laddr, lport, faddr, fport, |
1bbdceef | 447 | udp_ehash_secret + net_hash_mix(net)); |
65cd8033 HFS |
448 | } |
449 | ||
d1e37288 | 450 | /* called with rcu_read_lock() */ |
5051ebd2 ED |
451 | static struct sock *udp4_lib_lookup2(struct net *net, |
452 | __be32 saddr, __be16 sport, | |
453 | __be32 daddr, unsigned int hnum, int dif, | |
d1e37288 | 454 | struct udp_hslot *hslot2, |
1134158b | 455 | struct sk_buff *skb) |
5051ebd2 ED |
456 | { |
457 | struct sock *sk, *result; | |
ba418fa3 TH |
458 | int score, badness, matches = 0, reuseport = 0; |
459 | u32 hash = 0; | |
5051ebd2 | 460 | |
5051ebd2 | 461 | result = NULL; |
ba418fa3 | 462 | badness = 0; |
ca065d0c | 463 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
d1e37288 | 464 | score = compute_score(sk, net, saddr, sport, |
5051ebd2 ED |
465 | daddr, hnum, dif); |
466 | if (score > badness) { | |
ba418fa3 TH |
467 | reuseport = sk->sk_reuseport; |
468 | if (reuseport) { | |
65cd8033 HFS |
469 | hash = udp_ehashfn(net, daddr, hnum, |
470 | saddr, sport); | |
ca065d0c | 471 | result = reuseport_select_sock(sk, hash, skb, |
ed0dfffd | 472 | sizeof(struct udphdr)); |
ca065d0c ED |
473 | if (result) |
474 | return result; | |
ba418fa3 TH |
475 | matches = 1; |
476 | } | |
ca065d0c ED |
477 | badness = score; |
478 | result = sk; | |
ba418fa3 TH |
479 | } else if (score == badness && reuseport) { |
480 | matches++; | |
8fc54f68 | 481 | if (reciprocal_scale(hash, matches) == 0) |
ba418fa3 TH |
482 | result = sk; |
483 | hash = next_pseudo_random32(hash); | |
5051ebd2 ED |
484 | } |
485 | } | |
5051ebd2 ED |
486 | return result; |
487 | } | |
488 | ||
db8dac20 DM |
489 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
490 | * harder than this. -DaveM | |
491 | */ | |
fce82338 | 492 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, |
db8dac20 | 493 | __be16 sport, __be32 daddr, __be16 dport, |
538950a1 | 494 | int dif, struct udp_table *udptable, struct sk_buff *skb) |
db8dac20 | 495 | { |
271b72c7 | 496 | struct sock *sk, *result; |
db8dac20 | 497 | unsigned short hnum = ntohs(dport); |
5051ebd2 ED |
498 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
499 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
ba418fa3 TH |
500 | int score, badness, matches = 0, reuseport = 0; |
501 | u32 hash = 0; | |
645ca708 | 502 | |
5051ebd2 ED |
503 | if (hslot->count > 10) { |
504 | hash2 = udp4_portaddr_hash(net, daddr, hnum); | |
505 | slot2 = hash2 & udptable->mask; | |
506 | hslot2 = &udptable->hash2[slot2]; | |
507 | if (hslot->count < hslot2->count) | |
508 | goto begin; | |
509 | ||
510 | result = udp4_lib_lookup2(net, saddr, sport, | |
511 | daddr, hnum, dif, | |
d1e37288 | 512 | hslot2, skb); |
5051ebd2 | 513 | if (!result) { |
d1e37288 | 514 | unsigned int old_slot2 = slot2; |
0eae88f3 | 515 | hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
5051ebd2 | 516 | slot2 = hash2 & udptable->mask; |
d1e37288 SX |
517 | /* avoid searching the same slot again. */ |
518 | if (unlikely(slot2 == old_slot2)) | |
519 | return result; | |
520 | ||
5051ebd2 ED |
521 | hslot2 = &udptable->hash2[slot2]; |
522 | if (hslot->count < hslot2->count) | |
523 | goto begin; | |
524 | ||
1223c67c | 525 | result = udp4_lib_lookup2(net, saddr, sport, |
d1e37288 SX |
526 | daddr, hnum, dif, |
527 | hslot2, skb); | |
5051ebd2 | 528 | } |
5051ebd2 ED |
529 | return result; |
530 | } | |
271b72c7 ED |
531 | begin: |
532 | result = NULL; | |
ba418fa3 | 533 | badness = 0; |
ca065d0c | 534 | sk_for_each_rcu(sk, &hslot->head) { |
d1e37288 SX |
535 | score = compute_score(sk, net, saddr, sport, |
536 | daddr, hnum, dif); | |
645ca708 | 537 | if (score > badness) { |
ba418fa3 TH |
538 | reuseport = sk->sk_reuseport; |
539 | if (reuseport) { | |
65cd8033 HFS |
540 | hash = udp_ehashfn(net, daddr, hnum, |
541 | saddr, sport); | |
ca065d0c | 542 | result = reuseport_select_sock(sk, hash, skb, |
538950a1 | 543 | sizeof(struct udphdr)); |
ca065d0c ED |
544 | if (result) |
545 | return result; | |
ba418fa3 TH |
546 | matches = 1; |
547 | } | |
ca065d0c ED |
548 | result = sk; |
549 | badness = score; | |
ba418fa3 TH |
550 | } else if (score == badness && reuseport) { |
551 | matches++; | |
8fc54f68 | 552 | if (reciprocal_scale(hash, matches) == 0) |
ba418fa3 TH |
553 | result = sk; |
554 | hash = next_pseudo_random32(hash); | |
db8dac20 DM |
555 | } |
556 | } | |
db8dac20 DM |
557 | return result; |
558 | } | |
fce82338 | 559 | EXPORT_SYMBOL_GPL(__udp4_lib_lookup); |
db8dac20 | 560 | |
607c4aaf KK |
561 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
562 | __be16 sport, __be16 dport, | |
645ca708 | 563 | struct udp_table *udptable) |
607c4aaf KK |
564 | { |
565 | const struct iphdr *iph = ip_hdr(skb); | |
566 | ||
ed7cbbce | 567 | return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport, |
8afdd99a | 568 | iph->daddr, dport, inet_iif(skb), |
538950a1 | 569 | udptable, skb); |
607c4aaf KK |
570 | } |
571 | ||
63058308 TH |
572 | struct sock *udp4_lib_lookup_skb(struct sk_buff *skb, |
573 | __be16 sport, __be16 dport) | |
574 | { | |
ed7cbbce | 575 | return __udp4_lib_lookup_skb(skb, sport, dport, &udp_table); |
63058308 TH |
576 | } |
577 | EXPORT_SYMBOL_GPL(udp4_lib_lookup_skb); | |
578 | ||
ca065d0c ED |
579 | /* Must be called under rcu_read_lock(). |
580 | * Does increment socket refcount. | |
581 | */ | |
582 | #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ | |
583 | IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) | |
bcd41303 KK |
584 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
585 | __be32 daddr, __be16 dport, int dif) | |
586 | { | |
ca065d0c ED |
587 | struct sock *sk; |
588 | ||
589 | sk = __udp4_lib_lookup(net, saddr, sport, daddr, dport, | |
590 | dif, &udp_table, NULL); | |
591 | if (sk && !atomic_inc_not_zero(&sk->sk_refcnt)) | |
592 | sk = NULL; | |
593 | return sk; | |
bcd41303 KK |
594 | } |
595 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); | |
ca065d0c | 596 | #endif |
bcd41303 | 597 | |
421b3885 SB |
598 | static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk, |
599 | __be16 loc_port, __be32 loc_addr, | |
600 | __be16 rmt_port, __be32 rmt_addr, | |
601 | int dif, unsigned short hnum) | |
602 | { | |
603 | struct inet_sock *inet = inet_sk(sk); | |
604 | ||
605 | if (!net_eq(sock_net(sk), net) || | |
606 | udp_sk(sk)->udp_port_hash != hnum || | |
607 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || | |
608 | (inet->inet_dport != rmt_port && inet->inet_dport) || | |
609 | (inet->inet_rcv_saddr && inet->inet_rcv_saddr != loc_addr) || | |
610 | ipv6_only_sock(sk) || | |
611 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif)) | |
612 | return false; | |
613 | if (!ip_mc_sf_allow(sk, loc_addr, rmt_addr, dif)) | |
614 | return false; | |
615 | return true; | |
616 | } | |
617 | ||
db8dac20 DM |
618 | /* |
619 | * This routine is called by the ICMP module when it gets some | |
620 | * sort of error condition. If err < 0 then the socket should | |
621 | * be closed and the error returned to the user. If err > 0 | |
622 | * it's just the icmp type << 8 | icmp code. | |
623 | * Header points to the ip header of the error packet. We move | |
624 | * on past this. Then (as it used to claim before adjustment) | |
625 | * header points to the first 8 bytes of the udp header. We need | |
626 | * to find the appropriate port. | |
627 | */ | |
628 | ||
645ca708 | 629 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) |
db8dac20 DM |
630 | { |
631 | struct inet_sock *inet; | |
b71d1d42 | 632 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
c482c568 | 633 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); |
db8dac20 DM |
634 | const int type = icmp_hdr(skb)->type; |
635 | const int code = icmp_hdr(skb)->code; | |
636 | struct sock *sk; | |
637 | int harderr; | |
638 | int err; | |
fd54d716 | 639 | struct net *net = dev_net(skb->dev); |
db8dac20 | 640 | |
fd54d716 | 641 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
538950a1 CG |
642 | iph->saddr, uh->source, skb->dev->ifindex, udptable, |
643 | NULL); | |
51456b29 | 644 | if (!sk) { |
5d3848bc | 645 | __ICMP_INC_STATS(net, ICMP_MIB_INERRORS); |
db8dac20 DM |
646 | return; /* No socket for error */ |
647 | } | |
648 | ||
649 | err = 0; | |
650 | harderr = 0; | |
651 | inet = inet_sk(sk); | |
652 | ||
653 | switch (type) { | |
654 | default: | |
655 | case ICMP_TIME_EXCEEDED: | |
656 | err = EHOSTUNREACH; | |
657 | break; | |
658 | case ICMP_SOURCE_QUENCH: | |
659 | goto out; | |
660 | case ICMP_PARAMETERPROB: | |
661 | err = EPROTO; | |
662 | harderr = 1; | |
663 | break; | |
664 | case ICMP_DEST_UNREACH: | |
665 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
36393395 | 666 | ipv4_sk_update_pmtu(skb, sk, info); |
db8dac20 DM |
667 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { |
668 | err = EMSGSIZE; | |
669 | harderr = 1; | |
670 | break; | |
671 | } | |
672 | goto out; | |
673 | } | |
674 | err = EHOSTUNREACH; | |
675 | if (code <= NR_ICMP_UNREACH) { | |
676 | harderr = icmp_err_convert[code].fatal; | |
677 | err = icmp_err_convert[code].errno; | |
678 | } | |
679 | break; | |
55be7a9c DM |
680 | case ICMP_REDIRECT: |
681 | ipv4_sk_redirect(skb, sk); | |
1a462d18 | 682 | goto out; |
db8dac20 DM |
683 | } |
684 | ||
685 | /* | |
686 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
687 | * 4.1.3.3. | |
688 | */ | |
689 | if (!inet->recverr) { | |
690 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
691 | goto out; | |
b1faf566 | 692 | } else |
c482c568 | 693 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
b1faf566 | 694 | |
db8dac20 DM |
695 | sk->sk_err = err; |
696 | sk->sk_error_report(sk); | |
697 | out: | |
ca065d0c | 698 | return; |
db8dac20 DM |
699 | } |
700 | ||
701 | void udp_err(struct sk_buff *skb, u32 info) | |
702 | { | |
645ca708 | 703 | __udp4_lib_err(skb, info, &udp_table); |
db8dac20 DM |
704 | } |
705 | ||
706 | /* | |
707 | * Throw away all pending data and cancel the corking. Socket is locked. | |
708 | */ | |
36d926b9 | 709 | void udp_flush_pending_frames(struct sock *sk) |
db8dac20 DM |
710 | { |
711 | struct udp_sock *up = udp_sk(sk); | |
712 | ||
713 | if (up->pending) { | |
714 | up->len = 0; | |
715 | up->pending = 0; | |
716 | ip_flush_pending_frames(sk); | |
717 | } | |
718 | } | |
36d926b9 | 719 | EXPORT_SYMBOL(udp_flush_pending_frames); |
db8dac20 DM |
720 | |
721 | /** | |
f6b9664f | 722 | * udp4_hwcsum - handle outgoing HW checksumming |
db8dac20 DM |
723 | * @skb: sk_buff containing the filled-in UDP header |
724 | * (checksum field must be zeroed out) | |
f6b9664f HX |
725 | * @src: source IP address |
726 | * @dst: destination IP address | |
db8dac20 | 727 | */ |
c26bf4a5 | 728 | void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst) |
db8dac20 | 729 | { |
db8dac20 | 730 | struct udphdr *uh = udp_hdr(skb); |
f6b9664f HX |
731 | int offset = skb_transport_offset(skb); |
732 | int len = skb->len - offset; | |
733 | int hlen = len; | |
db8dac20 DM |
734 | __wsum csum = 0; |
735 | ||
ebbe495f | 736 | if (!skb_has_frag_list(skb)) { |
db8dac20 DM |
737 | /* |
738 | * Only one fragment on the socket. | |
739 | */ | |
740 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
741 | skb->csum_offset = offsetof(struct udphdr, check); | |
f6b9664f HX |
742 | uh->check = ~csum_tcpudp_magic(src, dst, len, |
743 | IPPROTO_UDP, 0); | |
db8dac20 | 744 | } else { |
ebbe495f WC |
745 | struct sk_buff *frags; |
746 | ||
db8dac20 DM |
747 | /* |
748 | * HW-checksum won't work as there are two or more | |
749 | * fragments on the socket so that all csums of sk_buffs | |
750 | * should be together | |
751 | */ | |
ebbe495f | 752 | skb_walk_frags(skb, frags) { |
f6b9664f HX |
753 | csum = csum_add(csum, frags->csum); |
754 | hlen -= frags->len; | |
ebbe495f | 755 | } |
db8dac20 | 756 | |
f6b9664f | 757 | csum = skb_checksum(skb, offset, hlen, csum); |
db8dac20 DM |
758 | skb->ip_summed = CHECKSUM_NONE; |
759 | ||
db8dac20 DM |
760 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); |
761 | if (uh->check == 0) | |
762 | uh->check = CSUM_MANGLED_0; | |
763 | } | |
764 | } | |
c26bf4a5 | 765 | EXPORT_SYMBOL_GPL(udp4_hwcsum); |
db8dac20 | 766 | |
af5fcba7 TH |
767 | /* Function to set UDP checksum for an IPv4 UDP packet. This is intended |
768 | * for the simple case like when setting the checksum for a UDP tunnel. | |
769 | */ | |
770 | void udp_set_csum(bool nocheck, struct sk_buff *skb, | |
771 | __be32 saddr, __be32 daddr, int len) | |
772 | { | |
773 | struct udphdr *uh = udp_hdr(skb); | |
774 | ||
179bc67f | 775 | if (nocheck) { |
af5fcba7 | 776 | uh->check = 0; |
179bc67f | 777 | } else if (skb_is_gso(skb)) { |
af5fcba7 | 778 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); |
179bc67f EC |
779 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { |
780 | uh->check = 0; | |
781 | uh->check = udp_v4_check(len, saddr, daddr, lco_csum(skb)); | |
782 | if (uh->check == 0) | |
783 | uh->check = CSUM_MANGLED_0; | |
d75f1306 | 784 | } else { |
af5fcba7 TH |
785 | skb->ip_summed = CHECKSUM_PARTIAL; |
786 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
787 | skb->csum_offset = offsetof(struct udphdr, check); | |
788 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); | |
af5fcba7 TH |
789 | } |
790 | } | |
791 | EXPORT_SYMBOL(udp_set_csum); | |
792 | ||
79ab0531 | 793 | static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4) |
db8dac20 | 794 | { |
f6b9664f | 795 | struct sock *sk = skb->sk; |
db8dac20 | 796 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
797 | struct udphdr *uh; |
798 | int err = 0; | |
799 | int is_udplite = IS_UDPLITE(sk); | |
f6b9664f HX |
800 | int offset = skb_transport_offset(skb); |
801 | int len = skb->len - offset; | |
db8dac20 DM |
802 | __wsum csum = 0; |
803 | ||
db8dac20 DM |
804 | /* |
805 | * Create a UDP header | |
806 | */ | |
807 | uh = udp_hdr(skb); | |
f6b9664f | 808 | uh->source = inet->inet_sport; |
79ab0531 | 809 | uh->dest = fl4->fl4_dport; |
f6b9664f | 810 | uh->len = htons(len); |
db8dac20 DM |
811 | uh->check = 0; |
812 | ||
813 | if (is_udplite) /* UDP-Lite */ | |
f6b9664f | 814 | csum = udplite_csum(skb); |
db8dac20 | 815 | |
28448b80 | 816 | else if (sk->sk_no_check_tx) { /* UDP csum disabled */ |
db8dac20 DM |
817 | |
818 | skb->ip_summed = CHECKSUM_NONE; | |
819 | goto send; | |
820 | ||
821 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
822 | ||
79ab0531 | 823 | udp4_hwcsum(skb, fl4->saddr, fl4->daddr); |
db8dac20 DM |
824 | goto send; |
825 | ||
f6b9664f HX |
826 | } else |
827 | csum = udp_csum(skb); | |
db8dac20 DM |
828 | |
829 | /* add protocol-dependent pseudo-header */ | |
79ab0531 | 830 | uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len, |
c482c568 | 831 | sk->sk_protocol, csum); |
db8dac20 DM |
832 | if (uh->check == 0) |
833 | uh->check = CSUM_MANGLED_0; | |
834 | ||
835 | send: | |
b5ec8eea | 836 | err = ip_send_skb(sock_net(sk), skb); |
6ce9e7b5 ED |
837 | if (err) { |
838 | if (err == -ENOBUFS && !inet->recverr) { | |
6aef70a8 ED |
839 | UDP_INC_STATS(sock_net(sk), |
840 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
841 | err = 0; |
842 | } | |
843 | } else | |
6aef70a8 ED |
844 | UDP_INC_STATS(sock_net(sk), |
845 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
f6b9664f HX |
846 | return err; |
847 | } | |
848 | ||
849 | /* | |
850 | * Push out all pending data as one UDP datagram. Socket is locked. | |
851 | */ | |
8822b64a | 852 | int udp_push_pending_frames(struct sock *sk) |
f6b9664f HX |
853 | { |
854 | struct udp_sock *up = udp_sk(sk); | |
855 | struct inet_sock *inet = inet_sk(sk); | |
b6f21b26 | 856 | struct flowi4 *fl4 = &inet->cork.fl.u.ip4; |
f6b9664f HX |
857 | struct sk_buff *skb; |
858 | int err = 0; | |
859 | ||
77968b78 | 860 | skb = ip_finish_skb(sk, fl4); |
f6b9664f HX |
861 | if (!skb) |
862 | goto out; | |
863 | ||
79ab0531 | 864 | err = udp_send_skb(skb, fl4); |
f6b9664f | 865 | |
db8dac20 DM |
866 | out: |
867 | up->len = 0; | |
868 | up->pending = 0; | |
db8dac20 DM |
869 | return err; |
870 | } | |
8822b64a | 871 | EXPORT_SYMBOL(udp_push_pending_frames); |
db8dac20 | 872 | |
1b784140 | 873 | int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
db8dac20 DM |
874 | { |
875 | struct inet_sock *inet = inet_sk(sk); | |
876 | struct udp_sock *up = udp_sk(sk); | |
e474995f | 877 | struct flowi4 fl4_stack; |
b6f21b26 | 878 | struct flowi4 *fl4; |
db8dac20 DM |
879 | int ulen = len; |
880 | struct ipcm_cookie ipc; | |
881 | struct rtable *rt = NULL; | |
882 | int free = 0; | |
883 | int connected = 0; | |
884 | __be32 daddr, faddr, saddr; | |
885 | __be16 dport; | |
886 | u8 tos; | |
887 | int err, is_udplite = IS_UDPLITE(sk); | |
888 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; | |
889 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); | |
903ab86d | 890 | struct sk_buff *skb; |
f6d8bd05 | 891 | struct ip_options_data opt_copy; |
db8dac20 DM |
892 | |
893 | if (len > 0xFFFF) | |
894 | return -EMSGSIZE; | |
895 | ||
896 | /* | |
897 | * Check the flags. | |
898 | */ | |
899 | ||
c482c568 | 900 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
db8dac20 DM |
901 | return -EOPNOTSUPP; |
902 | ||
903 | ipc.opt = NULL; | |
2244d07b | 904 | ipc.tx_flags = 0; |
aa661581 FF |
905 | ipc.ttl = 0; |
906 | ipc.tos = -1; | |
db8dac20 | 907 | |
903ab86d HX |
908 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
909 | ||
f5fca608 | 910 | fl4 = &inet->cork.fl.u.ip4; |
db8dac20 DM |
911 | if (up->pending) { |
912 | /* | |
913 | * There are pending frames. | |
914 | * The socket lock must be held while it's corked. | |
915 | */ | |
916 | lock_sock(sk); | |
917 | if (likely(up->pending)) { | |
918 | if (unlikely(up->pending != AF_INET)) { | |
919 | release_sock(sk); | |
920 | return -EINVAL; | |
921 | } | |
922 | goto do_append_data; | |
923 | } | |
924 | release_sock(sk); | |
925 | } | |
926 | ulen += sizeof(struct udphdr); | |
927 | ||
928 | /* | |
929 | * Get and verify the address. | |
930 | */ | |
931 | if (msg->msg_name) { | |
342dfc30 | 932 | DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
db8dac20 DM |
933 | if (msg->msg_namelen < sizeof(*usin)) |
934 | return -EINVAL; | |
935 | if (usin->sin_family != AF_INET) { | |
936 | if (usin->sin_family != AF_UNSPEC) | |
937 | return -EAFNOSUPPORT; | |
938 | } | |
939 | ||
940 | daddr = usin->sin_addr.s_addr; | |
941 | dport = usin->sin_port; | |
942 | if (dport == 0) | |
943 | return -EINVAL; | |
944 | } else { | |
945 | if (sk->sk_state != TCP_ESTABLISHED) | |
946 | return -EDESTADDRREQ; | |
c720c7e8 ED |
947 | daddr = inet->inet_daddr; |
948 | dport = inet->inet_dport; | |
db8dac20 DM |
949 | /* Open fast path for connected socket. |
950 | Route will not be used, if at least one option is set. | |
951 | */ | |
952 | connected = 1; | |
953 | } | |
db8dac20 | 954 | |
c14ac945 SHY |
955 | ipc.sockc.tsflags = sk->sk_tsflags; |
956 | ipc.addr = inet->inet_saddr; | |
db8dac20 | 957 | ipc.oif = sk->sk_bound_dev_if; |
bf84a010 | 958 | |
db8dac20 | 959 | if (msg->msg_controllen) { |
24025c46 | 960 | err = ip_cmsg_send(sk, msg, &ipc, sk->sk_family == AF_INET6); |
91948309 ED |
961 | if (unlikely(err)) { |
962 | kfree(ipc.opt); | |
db8dac20 | 963 | return err; |
91948309 | 964 | } |
db8dac20 DM |
965 | if (ipc.opt) |
966 | free = 1; | |
967 | connected = 0; | |
968 | } | |
f6d8bd05 ED |
969 | if (!ipc.opt) { |
970 | struct ip_options_rcu *inet_opt; | |
971 | ||
972 | rcu_read_lock(); | |
973 | inet_opt = rcu_dereference(inet->inet_opt); | |
974 | if (inet_opt) { | |
975 | memcpy(&opt_copy, inet_opt, | |
976 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
977 | ipc.opt = &opt_copy.opt; | |
978 | } | |
979 | rcu_read_unlock(); | |
980 | } | |
db8dac20 DM |
981 | |
982 | saddr = ipc.addr; | |
983 | ipc.addr = faddr = daddr; | |
984 | ||
c14ac945 SHY |
985 | sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags); |
986 | ||
f6d8bd05 | 987 | if (ipc.opt && ipc.opt->opt.srr) { |
db8dac20 DM |
988 | if (!daddr) |
989 | return -EINVAL; | |
f6d8bd05 | 990 | faddr = ipc.opt->opt.faddr; |
db8dac20 DM |
991 | connected = 0; |
992 | } | |
aa661581 | 993 | tos = get_rttos(&ipc, inet); |
db8dac20 DM |
994 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
995 | (msg->msg_flags & MSG_DONTROUTE) || | |
f6d8bd05 | 996 | (ipc.opt && ipc.opt->opt.is_strictroute)) { |
db8dac20 DM |
997 | tos |= RTO_ONLINK; |
998 | connected = 0; | |
999 | } | |
1000 | ||
1001 | if (ipv4_is_multicast(daddr)) { | |
1002 | if (!ipc.oif) | |
1003 | ipc.oif = inet->mc_index; | |
1004 | if (!saddr) | |
1005 | saddr = inet->mc_addr; | |
1006 | connected = 0; | |
76e21053 EH |
1007 | } else if (!ipc.oif) |
1008 | ipc.oif = inet->uc_index; | |
db8dac20 DM |
1009 | |
1010 | if (connected) | |
c482c568 | 1011 | rt = (struct rtable *)sk_dst_check(sk, 0); |
db8dac20 | 1012 | |
51456b29 | 1013 | if (!rt) { |
84a3aa00 | 1014 | struct net *net = sock_net(sk); |
9a24abfa | 1015 | __u8 flow_flags = inet_sk_flowi_flags(sk); |
84a3aa00 | 1016 | |
e474995f | 1017 | fl4 = &fl4_stack; |
9a24abfa | 1018 | |
e474995f | 1019 | flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos, |
c0951cbc | 1020 | RT_SCOPE_UNIVERSE, sk->sk_protocol, |
9a24abfa | 1021 | flow_flags, |
c0951cbc DM |
1022 | faddr, saddr, dport, inet->inet_sport); |
1023 | ||
b5bdacf3 DA |
1024 | if (!saddr && ipc.oif) { |
1025 | err = l3mdev_get_saddr(net, ipc.oif, fl4); | |
1026 | if (err < 0) | |
1027 | goto out; | |
1028 | } | |
8cbb512c | 1029 | |
e474995f DM |
1030 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
1031 | rt = ip_route_output_flow(net, fl4, sk); | |
b23dd4fe DM |
1032 | if (IS_ERR(rt)) { |
1033 | err = PTR_ERR(rt); | |
06dc94b1 | 1034 | rt = NULL; |
db8dac20 | 1035 | if (err == -ENETUNREACH) |
f1d8cba6 | 1036 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
db8dac20 DM |
1037 | goto out; |
1038 | } | |
1039 | ||
1040 | err = -EACCES; | |
1041 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
1042 | !sock_flag(sk, SOCK_BROADCAST)) | |
1043 | goto out; | |
1044 | if (connected) | |
d8d1f30b | 1045 | sk_dst_set(sk, dst_clone(&rt->dst)); |
db8dac20 DM |
1046 | } |
1047 | ||
1048 | if (msg->msg_flags&MSG_CONFIRM) | |
1049 | goto do_confirm; | |
1050 | back_from_confirm: | |
1051 | ||
e474995f | 1052 | saddr = fl4->saddr; |
db8dac20 | 1053 | if (!ipc.addr) |
e474995f | 1054 | daddr = ipc.addr = fl4->daddr; |
db8dac20 | 1055 | |
903ab86d HX |
1056 | /* Lockless fast path for the non-corking case. */ |
1057 | if (!corkreq) { | |
f69e6d13 | 1058 | skb = ip_make_skb(sk, fl4, getfrag, msg, ulen, |
903ab86d HX |
1059 | sizeof(struct udphdr), &ipc, &rt, |
1060 | msg->msg_flags); | |
1061 | err = PTR_ERR(skb); | |
50c3a487 | 1062 | if (!IS_ERR_OR_NULL(skb)) |
79ab0531 | 1063 | err = udp_send_skb(skb, fl4); |
903ab86d HX |
1064 | goto out; |
1065 | } | |
1066 | ||
db8dac20 DM |
1067 | lock_sock(sk); |
1068 | if (unlikely(up->pending)) { | |
1069 | /* The socket is already corked while preparing it. */ | |
1070 | /* ... which is an evident application bug. --ANK */ | |
1071 | release_sock(sk); | |
1072 | ||
ba7a46f1 | 1073 | net_dbg_ratelimited("cork app bug 2\n"); |
db8dac20 DM |
1074 | err = -EINVAL; |
1075 | goto out; | |
1076 | } | |
1077 | /* | |
1078 | * Now cork the socket to pend data. | |
1079 | */ | |
b6f21b26 DM |
1080 | fl4 = &inet->cork.fl.u.ip4; |
1081 | fl4->daddr = daddr; | |
1082 | fl4->saddr = saddr; | |
9cce96df DM |
1083 | fl4->fl4_dport = dport; |
1084 | fl4->fl4_sport = inet->inet_sport; | |
db8dac20 DM |
1085 | up->pending = AF_INET; |
1086 | ||
1087 | do_append_data: | |
1088 | up->len += ulen; | |
f69e6d13 | 1089 | err = ip_append_data(sk, fl4, getfrag, msg, ulen, |
f5fca608 DM |
1090 | sizeof(struct udphdr), &ipc, &rt, |
1091 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); | |
db8dac20 DM |
1092 | if (err) |
1093 | udp_flush_pending_frames(sk); | |
1094 | else if (!corkreq) | |
1095 | err = udp_push_pending_frames(sk); | |
1096 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) | |
1097 | up->pending = 0; | |
1098 | release_sock(sk); | |
1099 | ||
1100 | out: | |
1101 | ip_rt_put(rt); | |
1102 | if (free) | |
1103 | kfree(ipc.opt); | |
1104 | if (!err) | |
1105 | return len; | |
1106 | /* | |
1107 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1108 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1109 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1110 | * things). We could add another new stat but at least for now that | |
1111 | * seems like overkill. | |
1112 | */ | |
1113 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1114 | UDP_INC_STATS(sock_net(sk), |
1115 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
db8dac20 DM |
1116 | } |
1117 | return err; | |
1118 | ||
1119 | do_confirm: | |
d8d1f30b | 1120 | dst_confirm(&rt->dst); |
db8dac20 DM |
1121 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1122 | goto back_from_confirm; | |
1123 | err = 0; | |
1124 | goto out; | |
1125 | } | |
c482c568 | 1126 | EXPORT_SYMBOL(udp_sendmsg); |
db8dac20 DM |
1127 | |
1128 | int udp_sendpage(struct sock *sk, struct page *page, int offset, | |
1129 | size_t size, int flags) | |
1130 | { | |
f5fca608 | 1131 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
1132 | struct udp_sock *up = udp_sk(sk); |
1133 | int ret; | |
1134 | ||
d3f7d56a SL |
1135 | if (flags & MSG_SENDPAGE_NOTLAST) |
1136 | flags |= MSG_MORE; | |
1137 | ||
db8dac20 DM |
1138 | if (!up->pending) { |
1139 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; | |
1140 | ||
1141 | /* Call udp_sendmsg to specify destination address which | |
1142 | * sendpage interface can't pass. | |
1143 | * This will succeed only when the socket is connected. | |
1144 | */ | |
1b784140 | 1145 | ret = udp_sendmsg(sk, &msg, 0); |
db8dac20 DM |
1146 | if (ret < 0) |
1147 | return ret; | |
1148 | } | |
1149 | ||
1150 | lock_sock(sk); | |
1151 | ||
1152 | if (unlikely(!up->pending)) { | |
1153 | release_sock(sk); | |
1154 | ||
ba7a46f1 | 1155 | net_dbg_ratelimited("udp cork app bug 3\n"); |
db8dac20 DM |
1156 | return -EINVAL; |
1157 | } | |
1158 | ||
f5fca608 DM |
1159 | ret = ip_append_page(sk, &inet->cork.fl.u.ip4, |
1160 | page, offset, size, flags); | |
db8dac20 DM |
1161 | if (ret == -EOPNOTSUPP) { |
1162 | release_sock(sk); | |
1163 | return sock_no_sendpage(sk->sk_socket, page, offset, | |
1164 | size, flags); | |
1165 | } | |
1166 | if (ret < 0) { | |
1167 | udp_flush_pending_frames(sk); | |
1168 | goto out; | |
1169 | } | |
1170 | ||
1171 | up->len += size; | |
1172 | if (!(up->corkflag || (flags&MSG_MORE))) | |
1173 | ret = udp_push_pending_frames(sk); | |
1174 | if (!ret) | |
1175 | ret = size; | |
1176 | out: | |
1177 | release_sock(sk); | |
1178 | return ret; | |
1179 | } | |
1180 | ||
85584672 ED |
1181 | /** |
1182 | * first_packet_length - return length of first packet in receive queue | |
1183 | * @sk: socket | |
1184 | * | |
1185 | * Drops all bad checksum frames, until a valid one is found. | |
1186 | * Returns the length of found skb, or 0 if none is found. | |
1187 | */ | |
1188 | static unsigned int first_packet_length(struct sock *sk) | |
1189 | { | |
1190 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; | |
1191 | struct sk_buff *skb; | |
1192 | unsigned int res; | |
1193 | ||
1194 | __skb_queue_head_init(&list_kill); | |
1195 | ||
1196 | spin_lock_bh(&rcvq->lock); | |
1197 | while ((skb = skb_peek(rcvq)) != NULL && | |
1198 | udp_lib_checksum_complete(skb)) { | |
02c22347 ED |
1199 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, |
1200 | IS_UDPLITE(sk)); | |
1201 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, | |
1202 | IS_UDPLITE(sk)); | |
8edf19c2 | 1203 | atomic_inc(&sk->sk_drops); |
85584672 ED |
1204 | __skb_unlink(skb, rcvq); |
1205 | __skb_queue_tail(&list_kill, skb); | |
1206 | } | |
1207 | res = skb ? skb->len : 0; | |
1208 | spin_unlock_bh(&rcvq->lock); | |
1209 | ||
1210 | if (!skb_queue_empty(&list_kill)) { | |
8a74ad60 ED |
1211 | bool slow = lock_sock_fast(sk); |
1212 | ||
85584672 ED |
1213 | __skb_queue_purge(&list_kill); |
1214 | sk_mem_reclaim_partial(sk); | |
8a74ad60 | 1215 | unlock_sock_fast(sk, slow); |
85584672 ED |
1216 | } |
1217 | return res; | |
1218 | } | |
1219 | ||
1da177e4 LT |
1220 | /* |
1221 | * IOCTL requests applicable to the UDP protocol | |
1222 | */ | |
e905a9ed | 1223 | |
1da177e4 LT |
1224 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1225 | { | |
6516c655 SH |
1226 | switch (cmd) { |
1227 | case SIOCOUTQ: | |
1da177e4 | 1228 | { |
31e6d363 ED |
1229 | int amount = sk_wmem_alloc_get(sk); |
1230 | ||
6516c655 SH |
1231 | return put_user(amount, (int __user *)arg); |
1232 | } | |
1da177e4 | 1233 | |
6516c655 SH |
1234 | case SIOCINQ: |
1235 | { | |
85584672 | 1236 | unsigned int amount = first_packet_length(sk); |
6516c655 | 1237 | |
6516c655 SH |
1238 | return put_user(amount, (int __user *)arg); |
1239 | } | |
1da177e4 | 1240 | |
6516c655 SH |
1241 | default: |
1242 | return -ENOIOCTLCMD; | |
1da177e4 | 1243 | } |
6516c655 SH |
1244 | |
1245 | return 0; | |
1da177e4 | 1246 | } |
c482c568 | 1247 | EXPORT_SYMBOL(udp_ioctl); |
1da177e4 | 1248 | |
db8dac20 DM |
1249 | /* |
1250 | * This should be easy, if there is something there we | |
1251 | * return it, otherwise we block. | |
1252 | */ | |
1253 | ||
1b784140 YX |
1254 | int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
1255 | int flags, int *addr_len) | |
db8dac20 DM |
1256 | { |
1257 | struct inet_sock *inet = inet_sk(sk); | |
342dfc30 | 1258 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
db8dac20 | 1259 | struct sk_buff *skb; |
59c2cdae | 1260 | unsigned int ulen, copied; |
627d2d6b | 1261 | int peeked, peeking, off; |
db8dac20 DM |
1262 | int err; |
1263 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 1264 | bool checksum_valid = false; |
8a74ad60 | 1265 | bool slow; |
db8dac20 | 1266 | |
db8dac20 | 1267 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 1268 | return ip_recv_error(sk, msg, len, addr_len); |
db8dac20 DM |
1269 | |
1270 | try_again: | |
627d2d6b | 1271 | peeking = off = sk_peek_offset(sk, flags); |
db8dac20 | 1272 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 1273 | &peeked, &off, &err); |
db8dac20 | 1274 | if (!skb) |
627d2d6b | 1275 | return err; |
db8dac20 | 1276 | |
e6afc8ac | 1277 | ulen = skb->len; |
59c2cdae | 1278 | copied = len; |
627d2d6b | 1279 | if (copied > ulen - off) |
1280 | copied = ulen - off; | |
59c2cdae | 1281 | else if (copied < ulen) |
db8dac20 DM |
1282 | msg->msg_flags |= MSG_TRUNC; |
1283 | ||
1284 | /* | |
1285 | * If checksum is needed at all, try to do it while copying the | |
1286 | * data. If the data is truncated, or if we only want a partial | |
1287 | * coverage checksum (UDP-Lite), do it before the copy. | |
1288 | */ | |
1289 | ||
627d2d6b | 1290 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov || peeking) { |
197c949e ED |
1291 | checksum_valid = !udp_lib_checksum_complete(skb); |
1292 | if (!checksum_valid) | |
db8dac20 DM |
1293 | goto csum_copy_err; |
1294 | } | |
1295 | ||
197c949e | 1296 | if (checksum_valid || skb_csum_unnecessary(skb)) |
627d2d6b | 1297 | err = skb_copy_datagram_msg(skb, off, msg, copied); |
db8dac20 | 1298 | else { |
627d2d6b | 1299 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
db8dac20 DM |
1300 | |
1301 | if (err == -EINVAL) | |
1302 | goto csum_copy_err; | |
1303 | } | |
1304 | ||
22911fc5 ED |
1305 | if (unlikely(err)) { |
1306 | trace_kfree_skb(skb, udp_recvmsg); | |
979402b1 ED |
1307 | if (!peeked) { |
1308 | atomic_inc(&sk->sk_drops); | |
6aef70a8 ED |
1309 | UDP_INC_STATS(sock_net(sk), |
1310 | UDP_MIB_INERRORS, is_udplite); | |
979402b1 | 1311 | } |
627d2d6b | 1312 | skb_free_datagram_locked(sk, skb); |
1313 | return err; | |
22911fc5 | 1314 | } |
db8dac20 DM |
1315 | |
1316 | if (!peeked) | |
6aef70a8 ED |
1317 | UDP_INC_STATS(sock_net(sk), |
1318 | UDP_MIB_INDATAGRAMS, is_udplite); | |
db8dac20 | 1319 | |
3b885787 | 1320 | sock_recv_ts_and_drops(msg, sk, skb); |
db8dac20 DM |
1321 | |
1322 | /* Copy the address. */ | |
c482c568 | 1323 | if (sin) { |
db8dac20 DM |
1324 | sin->sin_family = AF_INET; |
1325 | sin->sin_port = udp_hdr(skb)->source; | |
1326 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
1327 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
bceaa902 | 1328 | *addr_len = sizeof(*sin); |
db8dac20 DM |
1329 | } |
1330 | if (inet->cmsg_flags) | |
31c2e492 | 1331 | ip_cmsg_recv_offset(msg, skb, sizeof(struct udphdr) + off); |
db8dac20 | 1332 | |
59c2cdae | 1333 | err = copied; |
db8dac20 DM |
1334 | if (flags & MSG_TRUNC) |
1335 | err = ulen; | |
1336 | ||
627d2d6b | 1337 | __skb_free_datagram_locked(sk, skb, peeking ? -err : err); |
db8dac20 DM |
1338 | return err; |
1339 | ||
1340 | csum_copy_err: | |
8a74ad60 | 1341 | slow = lock_sock_fast(sk); |
6a5dc9e5 | 1342 | if (!skb_kill_datagram(sk, skb, flags)) { |
6aef70a8 ED |
1343 | UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
1344 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 1345 | } |
8a74ad60 | 1346 | unlock_sock_fast(sk, slow); |
db8dac20 | 1347 | |
beb39db5 ED |
1348 | /* starting over for a new packet, but check if we need to yield */ |
1349 | cond_resched(); | |
9cfaa8de | 1350 | msg->msg_flags &= ~MSG_TRUNC; |
db8dac20 DM |
1351 | goto try_again; |
1352 | } | |
1353 | ||
1da177e4 LT |
1354 | int udp_disconnect(struct sock *sk, int flags) |
1355 | { | |
1356 | struct inet_sock *inet = inet_sk(sk); | |
1357 | /* | |
1358 | * 1003.1g - break association. | |
1359 | */ | |
e905a9ed | 1360 | |
1da177e4 | 1361 | sk->sk_state = TCP_CLOSE; |
c720c7e8 ED |
1362 | inet->inet_daddr = 0; |
1363 | inet->inet_dport = 0; | |
bdeab991 | 1364 | sock_rps_reset_rxhash(sk); |
1da177e4 LT |
1365 | sk->sk_bound_dev_if = 0; |
1366 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
1367 | inet_reset_saddr(sk); | |
1368 | ||
1369 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { | |
1370 | sk->sk_prot->unhash(sk); | |
c720c7e8 | 1371 | inet->inet_sport = 0; |
1da177e4 LT |
1372 | } |
1373 | sk_dst_reset(sk); | |
1374 | return 0; | |
1375 | } | |
c482c568 | 1376 | EXPORT_SYMBOL(udp_disconnect); |
1da177e4 | 1377 | |
645ca708 ED |
1378 | void udp_lib_unhash(struct sock *sk) |
1379 | { | |
723b4610 ED |
1380 | if (sk_hashed(sk)) { |
1381 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
512615b6 ED |
1382 | struct udp_hslot *hslot, *hslot2; |
1383 | ||
1384 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1385 | udp_sk(sk)->udp_port_hash); | |
1386 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
645ca708 | 1387 | |
723b4610 | 1388 | spin_lock_bh(&hslot->lock); |
e32ea7e7 CG |
1389 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1390 | reuseport_detach_sock(sk); | |
ca065d0c | 1391 | if (sk_del_node_init_rcu(sk)) { |
fdcc8aa9 | 1392 | hslot->count--; |
c720c7e8 | 1393 | inet_sk(sk)->inet_num = 0; |
723b4610 | 1394 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
512615b6 ED |
1395 | |
1396 | spin_lock(&hslot2->lock); | |
ca065d0c | 1397 | hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
512615b6 ED |
1398 | hslot2->count--; |
1399 | spin_unlock(&hslot2->lock); | |
723b4610 ED |
1400 | } |
1401 | spin_unlock_bh(&hslot->lock); | |
645ca708 | 1402 | } |
645ca708 ED |
1403 | } |
1404 | EXPORT_SYMBOL(udp_lib_unhash); | |
1405 | ||
719f8358 ED |
1406 | /* |
1407 | * inet_rcv_saddr was changed, we must rehash secondary hash | |
1408 | */ | |
1409 | void udp_lib_rehash(struct sock *sk, u16 newhash) | |
1410 | { | |
1411 | if (sk_hashed(sk)) { | |
1412 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
1413 | struct udp_hslot *hslot, *hslot2, *nhslot2; | |
1414 | ||
1415 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
1416 | nhslot2 = udp_hashslot2(udptable, newhash); | |
1417 | udp_sk(sk)->udp_portaddr_hash = newhash; | |
e32ea7e7 CG |
1418 | |
1419 | if (hslot2 != nhslot2 || | |
1420 | rcu_access_pointer(sk->sk_reuseport_cb)) { | |
719f8358 ED |
1421 | hslot = udp_hashslot(udptable, sock_net(sk), |
1422 | udp_sk(sk)->udp_port_hash); | |
1423 | /* we must lock primary chain too */ | |
1424 | spin_lock_bh(&hslot->lock); | |
e32ea7e7 CG |
1425 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1426 | reuseport_detach_sock(sk); | |
1427 | ||
1428 | if (hslot2 != nhslot2) { | |
1429 | spin_lock(&hslot2->lock); | |
ca065d0c | 1430 | hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
e32ea7e7 CG |
1431 | hslot2->count--; |
1432 | spin_unlock(&hslot2->lock); | |
1433 | ||
1434 | spin_lock(&nhslot2->lock); | |
ca065d0c | 1435 | hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
e32ea7e7 CG |
1436 | &nhslot2->head); |
1437 | nhslot2->count++; | |
1438 | spin_unlock(&nhslot2->lock); | |
1439 | } | |
719f8358 ED |
1440 | |
1441 | spin_unlock_bh(&hslot->lock); | |
1442 | } | |
1443 | } | |
1444 | } | |
1445 | EXPORT_SYMBOL(udp_lib_rehash); | |
1446 | ||
1447 | static void udp_v4_rehash(struct sock *sk) | |
1448 | { | |
1449 | u16 new_hash = udp4_portaddr_hash(sock_net(sk), | |
1450 | inet_sk(sk)->inet_rcv_saddr, | |
1451 | inet_sk(sk)->inet_num); | |
1452 | udp_lib_rehash(sk, new_hash); | |
1453 | } | |
1454 | ||
93821778 HX |
1455 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1456 | { | |
fec5e652 | 1457 | int rc; |
766e9037 | 1458 | |
005ec974 | 1459 | if (inet_sk(sk)->inet_daddr) { |
bdeab991 | 1460 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 1461 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 1462 | sk_incoming_cpu_update(sk); |
005ec974 | 1463 | } |
fec5e652 | 1464 | |
e6afc8ac | 1465 | rc = __sock_queue_rcv_skb(sk, skb); |
766e9037 ED |
1466 | if (rc < 0) { |
1467 | int is_udplite = IS_UDPLITE(sk); | |
93821778 | 1468 | |
93821778 | 1469 | /* Note that an ENOMEM error is charged twice */ |
766e9037 | 1470 | if (rc == -ENOMEM) |
e61da9e2 | 1471 | UDP_INC_STATS(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
02c22347 | 1472 | is_udplite); |
e61da9e2 | 1473 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
766e9037 | 1474 | kfree_skb(skb); |
296f7ea7 | 1475 | trace_udp_fail_queue_rcv_skb(rc, sk); |
766e9037 | 1476 | return -1; |
93821778 HX |
1477 | } |
1478 | ||
1479 | return 0; | |
1480 | ||
93821778 HX |
1481 | } |
1482 | ||
447167bf ED |
1483 | static struct static_key udp_encap_needed __read_mostly; |
1484 | void udp_encap_enable(void) | |
1485 | { | |
1486 | if (!static_key_enabled(&udp_encap_needed)) | |
1487 | static_key_slow_inc(&udp_encap_needed); | |
1488 | } | |
1489 | EXPORT_SYMBOL(udp_encap_enable); | |
1490 | ||
db8dac20 DM |
1491 | /* returns: |
1492 | * -1: error | |
1493 | * 0: success | |
1494 | * >0: "udp encap" protocol resubmission | |
1495 | * | |
1496 | * Note that in the success and error cases, the skb is assumed to | |
1497 | * have either been requeued or freed. | |
1498 | */ | |
c482c568 | 1499 | int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
db8dac20 DM |
1500 | { |
1501 | struct udp_sock *up = udp_sk(sk); | |
1502 | int rc; | |
1503 | int is_udplite = IS_UDPLITE(sk); | |
1504 | ||
1505 | /* | |
1506 | * Charge it to the socket, dropping if the queue is full. | |
1507 | */ | |
1508 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1509 | goto drop; | |
1510 | nf_reset(skb); | |
1511 | ||
447167bf | 1512 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
0ad92ad0 ED |
1513 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
1514 | ||
db8dac20 DM |
1515 | /* |
1516 | * This is an encapsulation socket so pass the skb to | |
1517 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
1518 | * fall through and pass this up the UDP socket. | |
1519 | * up->encap_rcv() returns the following value: | |
1520 | * =0 if skb was successfully passed to the encap | |
1521 | * handler or was discarded by it. | |
1522 | * >0 if skb should be passed on to UDP. | |
1523 | * <0 if skb should be resubmitted as proto -N | |
1524 | */ | |
1525 | ||
1526 | /* if we're overly short, let UDP handle it */ | |
0ad92ad0 | 1527 | encap_rcv = ACCESS_ONCE(up->encap_rcv); |
e5aed006 | 1528 | if (encap_rcv) { |
db8dac20 DM |
1529 | int ret; |
1530 | ||
0a80966b TH |
1531 | /* Verify checksum before giving to encap */ |
1532 | if (udp_lib_checksum_complete(skb)) | |
1533 | goto csum_error; | |
1534 | ||
0ad92ad0 | 1535 | ret = encap_rcv(sk, skb); |
db8dac20 | 1536 | if (ret <= 0) { |
02c22347 ED |
1537 | __UDP_INC_STATS(sock_net(sk), |
1538 | UDP_MIB_INDATAGRAMS, | |
1539 | is_udplite); | |
db8dac20 DM |
1540 | return -ret; |
1541 | } | |
1542 | } | |
1543 | ||
1544 | /* FALLTHROUGH -- it's a UDP Packet */ | |
1545 | } | |
1546 | ||
1547 | /* | |
1548 | * UDP-Lite specific tests, ignored on UDP sockets | |
1549 | */ | |
1550 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { | |
1551 | ||
1552 | /* | |
1553 | * MIB statistics other than incrementing the error count are | |
1554 | * disabled for the following two types of errors: these depend | |
1555 | * on the application settings, not on the functioning of the | |
1556 | * protocol stack as such. | |
1557 | * | |
1558 | * RFC 3828 here recommends (sec 3.3): "There should also be a | |
1559 | * way ... to ... at least let the receiving application block | |
1560 | * delivery of packets with coverage values less than a value | |
1561 | * provided by the application." | |
1562 | */ | |
1563 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
1564 | net_dbg_ratelimited("UDPLite: partial coverage %d while full coverage %d requested\n", |
1565 | UDP_SKB_CB(skb)->cscov, skb->len); | |
db8dac20 DM |
1566 | goto drop; |
1567 | } | |
1568 | /* The next case involves violating the min. coverage requested | |
1569 | * by the receiver. This is subtle: if receiver wants x and x is | |
1570 | * greater than the buffersize/MTU then receiver will complain | |
1571 | * that it wants x while sender emits packets of smaller size y. | |
1572 | * Therefore the above ...()->partial_cov statement is essential. | |
1573 | */ | |
1574 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
1575 | net_dbg_ratelimited("UDPLite: coverage %d too small, need min %d\n", |
1576 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
db8dac20 DM |
1577 | goto drop; |
1578 | } | |
1579 | } | |
1580 | ||
ce25d66a ED |
1581 | if (rcu_access_pointer(sk->sk_filter) && |
1582 | udp_lib_checksum_complete(skb)) | |
e6afc8ac | 1583 | goto csum_error; |
ce25d66a | 1584 | |
ba66bbe5 | 1585 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) |
a6127697 | 1586 | goto drop; |
db8dac20 | 1587 | |
e6afc8ac | 1588 | udp_csum_pull_header(skb); |
274f482d | 1589 | if (sk_rcvqueues_full(sk, sk->sk_rcvbuf)) { |
02c22347 ED |
1590 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
1591 | is_udplite); | |
c377411f | 1592 | goto drop; |
3e215c8d | 1593 | } |
c377411f | 1594 | |
93821778 | 1595 | rc = 0; |
db8dac20 | 1596 | |
fbf8866d | 1597 | ipv4_pktinfo_prepare(sk, skb); |
93821778 HX |
1598 | bh_lock_sock(sk); |
1599 | if (!sock_owned_by_user(sk)) | |
1600 | rc = __udp_queue_rcv_skb(sk, skb); | |
f545a38f | 1601 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
55349790 ZY |
1602 | bh_unlock_sock(sk); |
1603 | goto drop; | |
1604 | } | |
93821778 HX |
1605 | bh_unlock_sock(sk); |
1606 | ||
1607 | return rc; | |
db8dac20 | 1608 | |
6a5dc9e5 | 1609 | csum_error: |
02c22347 | 1610 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
db8dac20 | 1611 | drop: |
02c22347 | 1612 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
8edf19c2 | 1613 | atomic_inc(&sk->sk_drops); |
db8dac20 DM |
1614 | kfree_skb(skb); |
1615 | return -1; | |
1616 | } | |
1617 | ||
97502231 | 1618 | /* For TCP sockets, sk_rx_dst is protected by socket lock |
e47eb5df | 1619 | * For UDP, we use xchg() to guard against concurrent changes. |
97502231 ED |
1620 | */ |
1621 | static void udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) | |
421b3885 | 1622 | { |
97502231 ED |
1623 | struct dst_entry *old; |
1624 | ||
e47eb5df ED |
1625 | dst_hold(dst); |
1626 | old = xchg(&sk->sk_rx_dst, dst); | |
1627 | dst_release(old); | |
421b3885 SB |
1628 | } |
1629 | ||
db8dac20 DM |
1630 | /* |
1631 | * Multicasts and broadcasts go to each listener. | |
1632 | * | |
1240d137 | 1633 | * Note: called only from the BH handler context. |
db8dac20 | 1634 | */ |
e3163493 | 1635 | static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
db8dac20 DM |
1636 | struct udphdr *uh, |
1637 | __be32 saddr, __be32 daddr, | |
36cbb245 RJ |
1638 | struct udp_table *udptable, |
1639 | int proto) | |
db8dac20 | 1640 | { |
ca065d0c | 1641 | struct sock *sk, *first = NULL; |
5cf3d461 DH |
1642 | unsigned short hnum = ntohs(uh->dest); |
1643 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
2dc41cff | 1644 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c ED |
1645 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
1646 | int dif = skb->dev->ifindex; | |
1647 | struct hlist_node *node; | |
1648 | struct sk_buff *nskb; | |
2dc41cff DH |
1649 | |
1650 | if (use_hash2) { | |
1651 | hash2_any = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum) & | |
1652 | udp_table.mask; | |
1653 | hash2 = udp4_portaddr_hash(net, daddr, hnum) & udp_table.mask; | |
1654 | start_lookup: | |
1655 | hslot = &udp_table.hash2[hash2]; | |
1656 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); | |
1657 | } | |
db8dac20 | 1658 | |
ca065d0c ED |
1659 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
1660 | if (!__udp_is_mcast_sock(net, sk, uh->dest, daddr, | |
1661 | uh->source, saddr, dif, hnum)) | |
1662 | continue; | |
1663 | ||
1664 | if (!first) { | |
1665 | first = sk; | |
1666 | continue; | |
1240d137 | 1667 | } |
ca065d0c | 1668 | nskb = skb_clone(skb, GFP_ATOMIC); |
1240d137 | 1669 | |
ca065d0c ED |
1670 | if (unlikely(!nskb)) { |
1671 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
1672 | __UDP_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
1673 | IS_UDPLITE(sk)); | |
1674 | __UDP_INC_STATS(net, UDP_MIB_INERRORS, | |
1675 | IS_UDPLITE(sk)); | |
ca065d0c ED |
1676 | continue; |
1677 | } | |
1678 | if (udp_queue_rcv_skb(sk, nskb) > 0) | |
1679 | consume_skb(nskb); | |
1680 | } | |
1240d137 | 1681 | |
2dc41cff DH |
1682 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
1683 | if (use_hash2 && hash2 != hash2_any) { | |
1684 | hash2 = hash2_any; | |
1685 | goto start_lookup; | |
1686 | } | |
1687 | ||
ca065d0c ED |
1688 | if (first) { |
1689 | if (udp_queue_rcv_skb(first, skb) > 0) | |
1690 | consume_skb(skb); | |
1240d137 | 1691 | } else { |
ca065d0c | 1692 | kfree_skb(skb); |
02c22347 ED |
1693 | __UDP_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
1694 | proto == IPPROTO_UDPLITE); | |
1240d137 | 1695 | } |
db8dac20 DM |
1696 | return 0; |
1697 | } | |
1698 | ||
1699 | /* Initialize UDP checksum. If exited with zero value (success), | |
1700 | * CHECKSUM_UNNECESSARY means, that no more checks are required. | |
1701 | * Otherwise, csum completion requires chacksumming packet body, | |
1702 | * including udp header and folding it to skb->csum. | |
1703 | */ | |
1704 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, | |
1705 | int proto) | |
1706 | { | |
db8dac20 DM |
1707 | int err; |
1708 | ||
1709 | UDP_SKB_CB(skb)->partial_cov = 0; | |
1710 | UDP_SKB_CB(skb)->cscov = skb->len; | |
1711 | ||
1712 | if (proto == IPPROTO_UDPLITE) { | |
1713 | err = udplite_checksum_init(skb, uh); | |
1714 | if (err) | |
1715 | return err; | |
1716 | } | |
1717 | ||
b46d9f62 HFS |
1718 | /* Note, we are only interested in != 0 or == 0, thus the |
1719 | * force to int. | |
1720 | */ | |
1721 | return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check, | |
1722 | inet_compute_pseudo); | |
db8dac20 DM |
1723 | } |
1724 | ||
1725 | /* | |
1726 | * All we need to do is get the socket, and then do a checksum. | |
1727 | */ | |
1728 | ||
645ca708 | 1729 | int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
db8dac20 DM |
1730 | int proto) |
1731 | { | |
1732 | struct sock *sk; | |
7b5e56f9 | 1733 | struct udphdr *uh; |
db8dac20 | 1734 | unsigned short ulen; |
adf30907 | 1735 | struct rtable *rt = skb_rtable(skb); |
2783ef23 | 1736 | __be32 saddr, daddr; |
0283328e | 1737 | struct net *net = dev_net(skb->dev); |
db8dac20 DM |
1738 | |
1739 | /* | |
1740 | * Validate the packet. | |
1741 | */ | |
1742 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
1743 | goto drop; /* No space for header. */ | |
1744 | ||
7b5e56f9 | 1745 | uh = udp_hdr(skb); |
db8dac20 | 1746 | ulen = ntohs(uh->len); |
ccc2d97c BM |
1747 | saddr = ip_hdr(skb)->saddr; |
1748 | daddr = ip_hdr(skb)->daddr; | |
1749 | ||
db8dac20 DM |
1750 | if (ulen > skb->len) |
1751 | goto short_packet; | |
1752 | ||
1753 | if (proto == IPPROTO_UDP) { | |
1754 | /* UDP validates ulen. */ | |
1755 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) | |
1756 | goto short_packet; | |
1757 | uh = udp_hdr(skb); | |
1758 | } | |
1759 | ||
1760 | if (udp4_csum_init(skb, uh, proto)) | |
1761 | goto csum_error; | |
1762 | ||
8afdd99a ED |
1763 | sk = skb_steal_sock(skb); |
1764 | if (sk) { | |
97502231 | 1765 | struct dst_entry *dst = skb_dst(skb); |
421b3885 | 1766 | int ret; |
421b3885 | 1767 | |
97502231 ED |
1768 | if (unlikely(sk->sk_rx_dst != dst)) |
1769 | udp_sk_rx_dst_set(sk, dst); | |
db8dac20 | 1770 | |
421b3885 | 1771 | ret = udp_queue_rcv_skb(sk, skb); |
8afdd99a | 1772 | sock_put(sk); |
421b3885 SB |
1773 | /* a return value > 0 means to resubmit the input, but |
1774 | * it wants the return to be -protocol, or 0 | |
1775 | */ | |
1776 | if (ret > 0) | |
1777 | return -ret; | |
1778 | return 0; | |
421b3885 | 1779 | } |
db8dac20 | 1780 | |
c18450a5 FF |
1781 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
1782 | return __udp4_lib_mcast_deliver(net, skb, uh, | |
36cbb245 | 1783 | saddr, daddr, udptable, proto); |
c18450a5 FF |
1784 | |
1785 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); | |
00db4124 | 1786 | if (sk) { |
a5b50476 ET |
1787 | int ret; |
1788 | ||
224d019c | 1789 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
2abb7cdc TH |
1790 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
1791 | inet_compute_pseudo); | |
1792 | ||
a5b50476 | 1793 | ret = udp_queue_rcv_skb(sk, skb); |
db8dac20 DM |
1794 | |
1795 | /* a return value > 0 means to resubmit the input, but | |
1796 | * it wants the return to be -protocol, or 0 | |
1797 | */ | |
1798 | if (ret > 0) | |
1799 | return -ret; | |
1800 | return 0; | |
1801 | } | |
1802 | ||
1803 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1804 | goto drop; | |
1805 | nf_reset(skb); | |
1806 | ||
1807 | /* No socket. Drop packet silently, if checksum is wrong */ | |
1808 | if (udp_lib_checksum_complete(skb)) | |
1809 | goto csum_error; | |
1810 | ||
02c22347 | 1811 | __UDP_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1812 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1813 | ||
1814 | /* | |
1815 | * Hmm. We got an UDP packet to a port to which we | |
1816 | * don't wanna listen. Ignore it. | |
1817 | */ | |
1818 | kfree_skb(skb); | |
1819 | return 0; | |
1820 | ||
1821 | short_packet: | |
ba7a46f1 JP |
1822 | net_dbg_ratelimited("UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
1823 | proto == IPPROTO_UDPLITE ? "Lite" : "", | |
1824 | &saddr, ntohs(uh->source), | |
1825 | ulen, skb->len, | |
1826 | &daddr, ntohs(uh->dest)); | |
db8dac20 DM |
1827 | goto drop; |
1828 | ||
1829 | csum_error: | |
1830 | /* | |
1831 | * RFC1122: OK. Discards the bad packet silently (as far as | |
1832 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). | |
1833 | */ | |
ba7a46f1 JP |
1834 | net_dbg_ratelimited("UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
1835 | proto == IPPROTO_UDPLITE ? "Lite" : "", | |
1836 | &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest), | |
1837 | ulen); | |
02c22347 | 1838 | __UDP_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 | 1839 | drop: |
02c22347 | 1840 | __UDP_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1841 | kfree_skb(skb); |
1842 | return 0; | |
1843 | } | |
1844 | ||
421b3885 SB |
1845 | /* We can only early demux multicast if there is a single matching socket. |
1846 | * If more than one socket found returns NULL | |
1847 | */ | |
1848 | static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net, | |
1849 | __be16 loc_port, __be32 loc_addr, | |
1850 | __be16 rmt_port, __be32 rmt_addr, | |
1851 | int dif) | |
1852 | { | |
1853 | struct sock *sk, *result; | |
421b3885 | 1854 | unsigned short hnum = ntohs(loc_port); |
ca065d0c | 1855 | unsigned int slot = udp_hashfn(net, hnum, udp_table.mask); |
421b3885 SB |
1856 | struct udp_hslot *hslot = &udp_table.hash[slot]; |
1857 | ||
63c6f81c ED |
1858 | /* Do not bother scanning a too big list */ |
1859 | if (hslot->count > 10) | |
1860 | return NULL; | |
1861 | ||
421b3885 | 1862 | result = NULL; |
ca065d0c ED |
1863 | sk_for_each_rcu(sk, &hslot->head) { |
1864 | if (__udp_is_mcast_sock(net, sk, loc_port, loc_addr, | |
1865 | rmt_port, rmt_addr, dif, hnum)) { | |
1866 | if (result) | |
1867 | return NULL; | |
421b3885 | 1868 | result = sk; |
421b3885 SB |
1869 | } |
1870 | } | |
ca065d0c | 1871 | |
421b3885 SB |
1872 | return result; |
1873 | } | |
1874 | ||
1875 | /* For unicast we should only early demux connected sockets or we can | |
1876 | * break forwarding setups. The chains here can be long so only check | |
1877 | * if the first socket is an exact match and if not move on. | |
1878 | */ | |
1879 | static struct sock *__udp4_lib_demux_lookup(struct net *net, | |
1880 | __be16 loc_port, __be32 loc_addr, | |
1881 | __be16 rmt_port, __be32 rmt_addr, | |
1882 | int dif) | |
1883 | { | |
421b3885 SB |
1884 | unsigned short hnum = ntohs(loc_port); |
1885 | unsigned int hash2 = udp4_portaddr_hash(net, loc_addr, hnum); | |
1886 | unsigned int slot2 = hash2 & udp_table.mask; | |
1887 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; | |
c7228317 | 1888 | INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr); |
421b3885 | 1889 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); |
ca065d0c | 1890 | struct sock *sk; |
421b3885 | 1891 | |
ca065d0c ED |
1892 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
1893 | if (INET_MATCH(sk, net, acookie, rmt_addr, | |
1894 | loc_addr, ports, dif)) | |
1895 | return sk; | |
421b3885 SB |
1896 | /* Only check first socket in chain */ |
1897 | break; | |
1898 | } | |
ca065d0c | 1899 | return NULL; |
421b3885 SB |
1900 | } |
1901 | ||
1902 | void udp_v4_early_demux(struct sk_buff *skb) | |
1903 | { | |
610438b7 ED |
1904 | struct net *net = dev_net(skb->dev); |
1905 | const struct iphdr *iph; | |
1906 | const struct udphdr *uh; | |
ca065d0c | 1907 | struct sock *sk = NULL; |
421b3885 | 1908 | struct dst_entry *dst; |
421b3885 | 1909 | int dif = skb->dev->ifindex; |
6e540309 | 1910 | int ours; |
421b3885 SB |
1911 | |
1912 | /* validate the packet */ | |
1913 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct udphdr))) | |
1914 | return; | |
1915 | ||
610438b7 ED |
1916 | iph = ip_hdr(skb); |
1917 | uh = udp_hdr(skb); | |
1918 | ||
421b3885 | 1919 | if (skb->pkt_type == PACKET_BROADCAST || |
6e540309 SB |
1920 | skb->pkt_type == PACKET_MULTICAST) { |
1921 | struct in_device *in_dev = __in_dev_get_rcu(skb->dev); | |
1922 | ||
1923 | if (!in_dev) | |
1924 | return; | |
1925 | ||
ad0ea198 PA |
1926 | /* we are supposed to accept bcast packets */ |
1927 | if (skb->pkt_type == PACKET_MULTICAST) { | |
1928 | ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr, | |
1929 | iph->protocol); | |
1930 | if (!ours) | |
1931 | return; | |
1932 | } | |
1933 | ||
421b3885 SB |
1934 | sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr, |
1935 | uh->source, iph->saddr, dif); | |
6e540309 | 1936 | } else if (skb->pkt_type == PACKET_HOST) { |
421b3885 SB |
1937 | sk = __udp4_lib_demux_lookup(net, uh->dest, iph->daddr, |
1938 | uh->source, iph->saddr, dif); | |
6e540309 | 1939 | } |
421b3885 | 1940 | |
ca065d0c | 1941 | if (!sk || !atomic_inc_not_zero_hint(&sk->sk_refcnt, 2)) |
421b3885 SB |
1942 | return; |
1943 | ||
1944 | skb->sk = sk; | |
82eabd9e | 1945 | skb->destructor = sock_efree; |
10e2eb87 | 1946 | dst = READ_ONCE(sk->sk_rx_dst); |
421b3885 SB |
1947 | |
1948 | if (dst) | |
1949 | dst = dst_check(dst, 0); | |
10e2eb87 ED |
1950 | if (dst) { |
1951 | /* DST_NOCACHE can not be used without taking a reference */ | |
1952 | if (dst->flags & DST_NOCACHE) { | |
1953 | if (likely(atomic_inc_not_zero(&dst->__refcnt))) | |
1954 | skb_dst_set(skb, dst); | |
1955 | } else { | |
1956 | skb_dst_set_noref(skb, dst); | |
1957 | } | |
1958 | } | |
421b3885 SB |
1959 | } |
1960 | ||
db8dac20 DM |
1961 | int udp_rcv(struct sk_buff *skb) |
1962 | { | |
645ca708 | 1963 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
db8dac20 DM |
1964 | } |
1965 | ||
7d06b2e0 | 1966 | void udp_destroy_sock(struct sock *sk) |
db8dac20 | 1967 | { |
44046a59 | 1968 | struct udp_sock *up = udp_sk(sk); |
8a74ad60 | 1969 | bool slow = lock_sock_fast(sk); |
db8dac20 | 1970 | udp_flush_pending_frames(sk); |
8a74ad60 | 1971 | unlock_sock_fast(sk, slow); |
44046a59 TP |
1972 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
1973 | void (*encap_destroy)(struct sock *sk); | |
1974 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1975 | if (encap_destroy) | |
1976 | encap_destroy(sk); | |
1977 | } | |
db8dac20 DM |
1978 | } |
1979 | ||
1da177e4 LT |
1980 | /* |
1981 | * Socket option code for UDP | |
1982 | */ | |
4c0a6cb0 | 1983 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1984 | char __user *optval, unsigned int optlen, |
4c0a6cb0 | 1985 | int (*push_pending_frames)(struct sock *)) |
1da177e4 LT |
1986 | { |
1987 | struct udp_sock *up = udp_sk(sk); | |
1c19448c | 1988 | int val, valbool; |
1da177e4 | 1989 | int err = 0; |
b2bf1e26 | 1990 | int is_udplite = IS_UDPLITE(sk); |
1da177e4 | 1991 | |
c482c568 | 1992 | if (optlen < sizeof(int)) |
1da177e4 LT |
1993 | return -EINVAL; |
1994 | ||
1995 | if (get_user(val, (int __user *)optval)) | |
1996 | return -EFAULT; | |
1997 | ||
1c19448c TH |
1998 | valbool = val ? 1 : 0; |
1999 | ||
6516c655 | 2000 | switch (optname) { |
1da177e4 LT |
2001 | case UDP_CORK: |
2002 | if (val != 0) { | |
2003 | up->corkflag = 1; | |
2004 | } else { | |
2005 | up->corkflag = 0; | |
2006 | lock_sock(sk); | |
4243cdc2 | 2007 | push_pending_frames(sk); |
1da177e4 LT |
2008 | release_sock(sk); |
2009 | } | |
2010 | break; | |
e905a9ed | 2011 | |
1da177e4 LT |
2012 | case UDP_ENCAP: |
2013 | switch (val) { | |
2014 | case 0: | |
2015 | case UDP_ENCAP_ESPINUDP: | |
2016 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
067b207b JC |
2017 | up->encap_rcv = xfrm4_udp_encap_rcv; |
2018 | /* FALLTHROUGH */ | |
342f0234 | 2019 | case UDP_ENCAP_L2TPINUDP: |
1da177e4 | 2020 | up->encap_type = val; |
447167bf | 2021 | udp_encap_enable(); |
1da177e4 LT |
2022 | break; |
2023 | default: | |
2024 | err = -ENOPROTOOPT; | |
2025 | break; | |
2026 | } | |
2027 | break; | |
2028 | ||
1c19448c TH |
2029 | case UDP_NO_CHECK6_TX: |
2030 | up->no_check6_tx = valbool; | |
2031 | break; | |
2032 | ||
2033 | case UDP_NO_CHECK6_RX: | |
2034 | up->no_check6_rx = valbool; | |
2035 | break; | |
2036 | ||
ba4e58ec GR |
2037 | /* |
2038 | * UDP-Lite's partial checksum coverage (RFC 3828). | |
2039 | */ | |
2040 | /* The sender sets actual checksum coverage length via this option. | |
2041 | * The case coverage > packet length is handled by send module. */ | |
2042 | case UDPLITE_SEND_CSCOV: | |
b2bf1e26 | 2043 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
2044 | return -ENOPROTOOPT; |
2045 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ | |
2046 | val = 8; | |
4be929be AD |
2047 | else if (val > USHRT_MAX) |
2048 | val = USHRT_MAX; | |
ba4e58ec GR |
2049 | up->pcslen = val; |
2050 | up->pcflag |= UDPLITE_SEND_CC; | |
2051 | break; | |
2052 | ||
e905a9ed YH |
2053 | /* The receiver specifies a minimum checksum coverage value. To make |
2054 | * sense, this should be set to at least 8 (as done below). If zero is | |
ba4e58ec GR |
2055 | * used, this again means full checksum coverage. */ |
2056 | case UDPLITE_RECV_CSCOV: | |
b2bf1e26 | 2057 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
2058 | return -ENOPROTOOPT; |
2059 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ | |
2060 | val = 8; | |
4be929be AD |
2061 | else if (val > USHRT_MAX) |
2062 | val = USHRT_MAX; | |
ba4e58ec GR |
2063 | up->pcrlen = val; |
2064 | up->pcflag |= UDPLITE_RECV_CC; | |
2065 | break; | |
2066 | ||
1da177e4 LT |
2067 | default: |
2068 | err = -ENOPROTOOPT; | |
2069 | break; | |
6516c655 | 2070 | } |
1da177e4 LT |
2071 | |
2072 | return err; | |
2073 | } | |
c482c568 | 2074 | EXPORT_SYMBOL(udp_lib_setsockopt); |
1da177e4 | 2075 | |
db8dac20 | 2076 | int udp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 2077 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
2078 | { |
2079 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
2080 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
2081 | udp_push_pending_frames); | |
2082 | return ip_setsockopt(sk, level, optname, optval, optlen); | |
2083 | } | |
2084 | ||
2085 | #ifdef CONFIG_COMPAT | |
2086 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 2087 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
2088 | { |
2089 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
2090 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
2091 | udp_push_pending_frames); | |
2092 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); | |
2093 | } | |
2094 | #endif | |
2095 | ||
4c0a6cb0 GR |
2096 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
2097 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
2098 | { |
2099 | struct udp_sock *up = udp_sk(sk); | |
2100 | int val, len; | |
2101 | ||
c482c568 | 2102 | if (get_user(len, optlen)) |
1da177e4 LT |
2103 | return -EFAULT; |
2104 | ||
2105 | len = min_t(unsigned int, len, sizeof(int)); | |
e905a9ed | 2106 | |
6516c655 | 2107 | if (len < 0) |
1da177e4 LT |
2108 | return -EINVAL; |
2109 | ||
6516c655 | 2110 | switch (optname) { |
1da177e4 LT |
2111 | case UDP_CORK: |
2112 | val = up->corkflag; | |
2113 | break; | |
2114 | ||
2115 | case UDP_ENCAP: | |
2116 | val = up->encap_type; | |
2117 | break; | |
2118 | ||
1c19448c TH |
2119 | case UDP_NO_CHECK6_TX: |
2120 | val = up->no_check6_tx; | |
2121 | break; | |
2122 | ||
2123 | case UDP_NO_CHECK6_RX: | |
2124 | val = up->no_check6_rx; | |
2125 | break; | |
2126 | ||
ba4e58ec GR |
2127 | /* The following two cannot be changed on UDP sockets, the return is |
2128 | * always 0 (which corresponds to the full checksum coverage of UDP). */ | |
2129 | case UDPLITE_SEND_CSCOV: | |
2130 | val = up->pcslen; | |
2131 | break; | |
2132 | ||
2133 | case UDPLITE_RECV_CSCOV: | |
2134 | val = up->pcrlen; | |
2135 | break; | |
2136 | ||
1da177e4 LT |
2137 | default: |
2138 | return -ENOPROTOOPT; | |
6516c655 | 2139 | } |
1da177e4 | 2140 | |
6516c655 | 2141 | if (put_user(len, optlen)) |
e905a9ed | 2142 | return -EFAULT; |
c482c568 | 2143 | if (copy_to_user(optval, &val, len)) |
1da177e4 | 2144 | return -EFAULT; |
e905a9ed | 2145 | return 0; |
1da177e4 | 2146 | } |
c482c568 | 2147 | EXPORT_SYMBOL(udp_lib_getsockopt); |
1da177e4 | 2148 | |
db8dac20 DM |
2149 | int udp_getsockopt(struct sock *sk, int level, int optname, |
2150 | char __user *optval, int __user *optlen) | |
2151 | { | |
2152 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
2153 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
2154 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
2155 | } | |
2156 | ||
2157 | #ifdef CONFIG_COMPAT | |
2158 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, | |
2159 | char __user *optval, int __user *optlen) | |
2160 | { | |
2161 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
2162 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
2163 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); | |
2164 | } | |
2165 | #endif | |
1da177e4 LT |
2166 | /** |
2167 | * udp_poll - wait for a UDP event. | |
2168 | * @file - file struct | |
2169 | * @sock - socket | |
2170 | * @wait - poll table | |
2171 | * | |
e905a9ed | 2172 | * This is same as datagram poll, except for the special case of |
1da177e4 LT |
2173 | * blocking sockets. If application is using a blocking fd |
2174 | * and a packet with checksum error is in the queue; | |
2175 | * then it could get return from select indicating data available | |
2176 | * but then block when reading it. Add special case code | |
2177 | * to work around these arguably broken applications. | |
2178 | */ | |
2179 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) | |
2180 | { | |
2181 | unsigned int mask = datagram_poll(file, sock, wait); | |
2182 | struct sock *sk = sock->sk; | |
ba4e58ec | 2183 | |
c3f1dbaf DM |
2184 | sock_rps_record_flow(sk); |
2185 | ||
1da177e4 | 2186 | /* Check for false positives due to checksum errors */ |
85584672 ED |
2187 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
2188 | !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk)) | |
2189 | mask &= ~(POLLIN | POLLRDNORM); | |
1da177e4 LT |
2190 | |
2191 | return mask; | |
e905a9ed | 2192 | |
1da177e4 | 2193 | } |
c482c568 | 2194 | EXPORT_SYMBOL(udp_poll); |
1da177e4 | 2195 | |
5d77dca8 DA |
2196 | int udp_abort(struct sock *sk, int err) |
2197 | { | |
2198 | lock_sock(sk); | |
2199 | ||
2200 | sk->sk_err = err; | |
2201 | sk->sk_error_report(sk); | |
2202 | udp_disconnect(sk, 0); | |
2203 | ||
2204 | release_sock(sk); | |
2205 | ||
2206 | return 0; | |
2207 | } | |
2208 | EXPORT_SYMBOL_GPL(udp_abort); | |
2209 | ||
db8dac20 DM |
2210 | struct proto udp_prot = { |
2211 | .name = "UDP", | |
2212 | .owner = THIS_MODULE, | |
2213 | .close = udp_lib_close, | |
2214 | .connect = ip4_datagram_connect, | |
2215 | .disconnect = udp_disconnect, | |
2216 | .ioctl = udp_ioctl, | |
2217 | .destroy = udp_destroy_sock, | |
2218 | .setsockopt = udp_setsockopt, | |
2219 | .getsockopt = udp_getsockopt, | |
2220 | .sendmsg = udp_sendmsg, | |
2221 | .recvmsg = udp_recvmsg, | |
2222 | .sendpage = udp_sendpage, | |
93821778 | 2223 | .backlog_rcv = __udp_queue_rcv_skb, |
8141ed9f | 2224 | .release_cb = ip4_datagram_release_cb, |
db8dac20 DM |
2225 | .hash = udp_lib_hash, |
2226 | .unhash = udp_lib_unhash, | |
719f8358 | 2227 | .rehash = udp_v4_rehash, |
db8dac20 DM |
2228 | .get_port = udp_v4_get_port, |
2229 | .memory_allocated = &udp_memory_allocated, | |
2230 | .sysctl_mem = sysctl_udp_mem, | |
2231 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
2232 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
2233 | .obj_size = sizeof(struct udp_sock), | |
271b72c7 | 2234 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 2235 | .h.udp_table = &udp_table, |
db8dac20 DM |
2236 | #ifdef CONFIG_COMPAT |
2237 | .compat_setsockopt = compat_udp_setsockopt, | |
2238 | .compat_getsockopt = compat_udp_getsockopt, | |
2239 | #endif | |
5d77dca8 | 2240 | .diag_destroy = udp_abort, |
db8dac20 | 2241 | }; |
c482c568 | 2242 | EXPORT_SYMBOL(udp_prot); |
1da177e4 LT |
2243 | |
2244 | /* ------------------------------------------------------------------------ */ | |
2245 | #ifdef CONFIG_PROC_FS | |
2246 | ||
645ca708 | 2247 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
1da177e4 LT |
2248 | { |
2249 | struct sock *sk; | |
2250 | struct udp_iter_state *state = seq->private; | |
6f191efe | 2251 | struct net *net = seq_file_net(seq); |
1da177e4 | 2252 | |
f86dcc5a ED |
2253 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
2254 | ++state->bucket) { | |
645ca708 | 2255 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
f86dcc5a | 2256 | |
ca065d0c | 2257 | if (hlist_empty(&hslot->head)) |
f86dcc5a ED |
2258 | continue; |
2259 | ||
645ca708 | 2260 | spin_lock_bh(&hslot->lock); |
ca065d0c | 2261 | sk_for_each(sk, &hslot->head) { |
878628fb | 2262 | if (!net_eq(sock_net(sk), net)) |
a91275ef | 2263 | continue; |
1da177e4 LT |
2264 | if (sk->sk_family == state->family) |
2265 | goto found; | |
2266 | } | |
645ca708 | 2267 | spin_unlock_bh(&hslot->lock); |
1da177e4 LT |
2268 | } |
2269 | sk = NULL; | |
2270 | found: | |
2271 | return sk; | |
2272 | } | |
2273 | ||
2274 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) | |
2275 | { | |
2276 | struct udp_iter_state *state = seq->private; | |
6f191efe | 2277 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2278 | |
2279 | do { | |
ca065d0c | 2280 | sk = sk_next(sk); |
878628fb | 2281 | } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); |
1da177e4 | 2282 | |
645ca708 | 2283 | if (!sk) { |
f86dcc5a | 2284 | if (state->bucket <= state->udp_table->mask) |
30842f29 | 2285 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
645ca708 | 2286 | return udp_get_first(seq, state->bucket + 1); |
1da177e4 LT |
2287 | } |
2288 | return sk; | |
2289 | } | |
2290 | ||
2291 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) | |
2292 | { | |
645ca708 | 2293 | struct sock *sk = udp_get_first(seq, 0); |
1da177e4 LT |
2294 | |
2295 | if (sk) | |
6516c655 | 2296 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
1da177e4 LT |
2297 | --pos; |
2298 | return pos ? NULL : sk; | |
2299 | } | |
2300 | ||
2301 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) | |
2302 | { | |
30842f29 | 2303 | struct udp_iter_state *state = seq->private; |
f86dcc5a | 2304 | state->bucket = MAX_UDP_PORTS; |
30842f29 | 2305 | |
b50660f1 | 2306 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
1da177e4 LT |
2307 | } |
2308 | ||
2309 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2310 | { | |
2311 | struct sock *sk; | |
2312 | ||
b50660f1 | 2313 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2314 | sk = udp_get_idx(seq, 0); |
2315 | else | |
2316 | sk = udp_get_next(seq, v); | |
2317 | ||
2318 | ++*pos; | |
2319 | return sk; | |
2320 | } | |
2321 | ||
2322 | static void udp_seq_stop(struct seq_file *seq, void *v) | |
2323 | { | |
645ca708 ED |
2324 | struct udp_iter_state *state = seq->private; |
2325 | ||
f86dcc5a | 2326 | if (state->bucket <= state->udp_table->mask) |
645ca708 | 2327 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
1da177e4 LT |
2328 | } |
2329 | ||
73cb88ec | 2330 | int udp_seq_open(struct inode *inode, struct file *file) |
1da177e4 | 2331 | { |
d9dda78b | 2332 | struct udp_seq_afinfo *afinfo = PDE_DATA(inode); |
a2be75c1 DL |
2333 | struct udp_iter_state *s; |
2334 | int err; | |
a91275ef | 2335 | |
a2be75c1 DL |
2336 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
2337 | sizeof(struct udp_iter_state)); | |
2338 | if (err < 0) | |
2339 | return err; | |
a91275ef | 2340 | |
a2be75c1 | 2341 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 2342 | s->family = afinfo->family; |
645ca708 | 2343 | s->udp_table = afinfo->udp_table; |
a2be75c1 | 2344 | return err; |
a91275ef | 2345 | } |
73cb88ec | 2346 | EXPORT_SYMBOL(udp_seq_open); |
a91275ef | 2347 | |
1da177e4 | 2348 | /* ------------------------------------------------------------------------ */ |
0c96d8c5 | 2349 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 LT |
2350 | { |
2351 | struct proc_dir_entry *p; | |
2352 | int rc = 0; | |
2353 | ||
dda61925 DL |
2354 | afinfo->seq_ops.start = udp_seq_start; |
2355 | afinfo->seq_ops.next = udp_seq_next; | |
2356 | afinfo->seq_ops.stop = udp_seq_stop; | |
2357 | ||
84841c3c | 2358 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
73cb88ec | 2359 | afinfo->seq_fops, afinfo); |
84841c3c | 2360 | if (!p) |
1da177e4 LT |
2361 | rc = -ENOMEM; |
2362 | return rc; | |
2363 | } | |
c482c568 | 2364 | EXPORT_SYMBOL(udp_proc_register); |
1da177e4 | 2365 | |
0c96d8c5 | 2366 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 | 2367 | { |
ece31ffd | 2368 | remove_proc_entry(afinfo->name, net->proc_net); |
1da177e4 | 2369 | } |
c482c568 | 2370 | EXPORT_SYMBOL(udp_proc_unregister); |
db8dac20 DM |
2371 | |
2372 | /* ------------------------------------------------------------------------ */ | |
5e659e4c | 2373 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
652586df | 2374 | int bucket) |
db8dac20 DM |
2375 | { |
2376 | struct inet_sock *inet = inet_sk(sp); | |
c720c7e8 ED |
2377 | __be32 dest = inet->inet_daddr; |
2378 | __be32 src = inet->inet_rcv_saddr; | |
2379 | __u16 destp = ntohs(inet->inet_dport); | |
2380 | __u16 srcp = ntohs(inet->inet_sport); | |
db8dac20 | 2381 | |
f86dcc5a | 2382 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
652586df | 2383 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d", |
db8dac20 | 2384 | bucket, src, srcp, dest, destp, sp->sk_state, |
31e6d363 ED |
2385 | sk_wmem_alloc_get(sp), |
2386 | sk_rmem_alloc_get(sp), | |
a7cb5a49 EB |
2387 | 0, 0L, 0, |
2388 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
2389 | 0, sock_i_ino(sp), | |
cb61cb9b | 2390 | atomic_read(&sp->sk_refcnt), sp, |
652586df | 2391 | atomic_read(&sp->sk_drops)); |
db8dac20 DM |
2392 | } |
2393 | ||
2394 | int udp4_seq_show(struct seq_file *seq, void *v) | |
2395 | { | |
652586df | 2396 | seq_setwidth(seq, 127); |
db8dac20 | 2397 | if (v == SEQ_START_TOKEN) |
652586df | 2398 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
db8dac20 | 2399 | "rx_queue tr tm->when retrnsmt uid timeout " |
cb61cb9b | 2400 | "inode ref pointer drops"); |
db8dac20 | 2401 | else { |
db8dac20 DM |
2402 | struct udp_iter_state *state = seq->private; |
2403 | ||
652586df | 2404 | udp4_format_sock(v, seq, state->bucket); |
db8dac20 | 2405 | } |
652586df | 2406 | seq_pad(seq, '\n'); |
db8dac20 DM |
2407 | return 0; |
2408 | } | |
2409 | ||
73cb88ec AV |
2410 | static const struct file_operations udp_afinfo_seq_fops = { |
2411 | .owner = THIS_MODULE, | |
2412 | .open = udp_seq_open, | |
2413 | .read = seq_read, | |
2414 | .llseek = seq_lseek, | |
2415 | .release = seq_release_net | |
2416 | }; | |
2417 | ||
db8dac20 | 2418 | /* ------------------------------------------------------------------------ */ |
db8dac20 | 2419 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
db8dac20 DM |
2420 | .name = "udp", |
2421 | .family = AF_INET, | |
645ca708 | 2422 | .udp_table = &udp_table, |
73cb88ec | 2423 | .seq_fops = &udp_afinfo_seq_fops, |
dda61925 DL |
2424 | .seq_ops = { |
2425 | .show = udp4_seq_show, | |
2426 | }, | |
db8dac20 DM |
2427 | }; |
2428 | ||
2c8c1e72 | 2429 | static int __net_init udp4_proc_init_net(struct net *net) |
15439feb PE |
2430 | { |
2431 | return udp_proc_register(net, &udp4_seq_afinfo); | |
2432 | } | |
2433 | ||
2c8c1e72 | 2434 | static void __net_exit udp4_proc_exit_net(struct net *net) |
15439feb PE |
2435 | { |
2436 | udp_proc_unregister(net, &udp4_seq_afinfo); | |
2437 | } | |
2438 | ||
2439 | static struct pernet_operations udp4_net_ops = { | |
2440 | .init = udp4_proc_init_net, | |
2441 | .exit = udp4_proc_exit_net, | |
2442 | }; | |
2443 | ||
db8dac20 DM |
2444 | int __init udp4_proc_init(void) |
2445 | { | |
15439feb | 2446 | return register_pernet_subsys(&udp4_net_ops); |
db8dac20 DM |
2447 | } |
2448 | ||
2449 | void udp4_proc_exit(void) | |
2450 | { | |
15439feb | 2451 | unregister_pernet_subsys(&udp4_net_ops); |
db8dac20 | 2452 | } |
1da177e4 LT |
2453 | #endif /* CONFIG_PROC_FS */ |
2454 | ||
f86dcc5a ED |
2455 | static __initdata unsigned long uhash_entries; |
2456 | static int __init set_uhash_entries(char *str) | |
645ca708 | 2457 | { |
413c27d8 EZ |
2458 | ssize_t ret; |
2459 | ||
f86dcc5a ED |
2460 | if (!str) |
2461 | return 0; | |
413c27d8 EZ |
2462 | |
2463 | ret = kstrtoul(str, 0, &uhash_entries); | |
2464 | if (ret) | |
2465 | return 0; | |
2466 | ||
f86dcc5a ED |
2467 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) |
2468 | uhash_entries = UDP_HTABLE_SIZE_MIN; | |
2469 | return 1; | |
2470 | } | |
2471 | __setup("uhash_entries=", set_uhash_entries); | |
645ca708 | 2472 | |
f86dcc5a ED |
2473 | void __init udp_table_init(struct udp_table *table, const char *name) |
2474 | { | |
2475 | unsigned int i; | |
2476 | ||
31fe62b9 TB |
2477 | table->hash = alloc_large_system_hash(name, |
2478 | 2 * sizeof(struct udp_hslot), | |
2479 | uhash_entries, | |
2480 | 21, /* one slot per 2 MB */ | |
2481 | 0, | |
2482 | &table->log, | |
2483 | &table->mask, | |
2484 | UDP_HTABLE_SIZE_MIN, | |
2485 | 64 * 1024); | |
2486 | ||
512615b6 | 2487 | table->hash2 = table->hash + (table->mask + 1); |
f86dcc5a | 2488 | for (i = 0; i <= table->mask; i++) { |
ca065d0c | 2489 | INIT_HLIST_HEAD(&table->hash[i].head); |
fdcc8aa9 | 2490 | table->hash[i].count = 0; |
645ca708 ED |
2491 | spin_lock_init(&table->hash[i].lock); |
2492 | } | |
512615b6 | 2493 | for (i = 0; i <= table->mask; i++) { |
ca065d0c | 2494 | INIT_HLIST_HEAD(&table->hash2[i].head); |
512615b6 ED |
2495 | table->hash2[i].count = 0; |
2496 | spin_lock_init(&table->hash2[i].lock); | |
2497 | } | |
645ca708 ED |
2498 | } |
2499 | ||
723b8e46 TH |
2500 | u32 udp_flow_hashrnd(void) |
2501 | { | |
2502 | static u32 hashrnd __read_mostly; | |
2503 | ||
2504 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
2505 | ||
2506 | return hashrnd; | |
2507 | } | |
2508 | EXPORT_SYMBOL(udp_flow_hashrnd); | |
2509 | ||
95766fff HA |
2510 | void __init udp_init(void) |
2511 | { | |
f03d78db | 2512 | unsigned long limit; |
95766fff | 2513 | |
f86dcc5a | 2514 | udp_table_init(&udp_table, "UDP"); |
f03d78db | 2515 | limit = nr_free_buffer_pages() / 8; |
95766fff HA |
2516 | limit = max(limit, 128UL); |
2517 | sysctl_udp_mem[0] = limit / 4 * 3; | |
2518 | sysctl_udp_mem[1] = limit; | |
2519 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; | |
2520 | ||
2521 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; | |
2522 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; | |
2523 | } |