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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 | ||
7c0f6ba6 | 82 | #include <linux/uaccess.h> |
1da177e4 | 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 | |
63a6fff3 RS |
137 | /* IPCB reference means this can not be used from early demux */ |
138 | static bool udp_lib_exact_dif_match(struct net *net, struct sk_buff *skb) | |
139 | { | |
140 | #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) | |
141 | if (!net->ipv4.sysctl_udp_l3mdev_accept && | |
142 | skb && ipv4_l3mdev_skb(IPCB(skb)->flags)) | |
143 | return true; | |
144 | #endif | |
145 | return false; | |
146 | } | |
147 | ||
f24d43c0 | 148 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
645ca708 | 149 | const struct udp_hslot *hslot, |
98322f22 | 150 | unsigned long *bitmap, |
fe38d2a1 | 151 | struct sock *sk, unsigned int log) |
1da177e4 | 152 | { |
f24d43c0 | 153 | struct sock *sk2; |
ba418fa3 | 154 | kuid_t uid = sock_i_uid(sk); |
25030a7f | 155 | |
ca065d0c | 156 | sk_for_each(sk2, &hslot->head) { |
9d4fb27d JP |
157 | if (net_eq(sock_net(sk2), net) && |
158 | sk2 != sk && | |
d4cada4a | 159 | (bitmap || udp_sk(sk2)->udp_port_hash == num) && |
9d4fb27d JP |
160 | (!sk2->sk_reuse || !sk->sk_reuse) && |
161 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
162 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
fe38d2a1 | 163 | inet_rcv_saddr_equal(sk, sk2, true)) { |
df560056 EG |
164 | if (sk2->sk_reuseport && sk->sk_reuseport && |
165 | !rcu_access_pointer(sk->sk_reuseport_cb) && | |
166 | uid_eq(uid, sock_i_uid(sk2))) { | |
167 | if (!bitmap) | |
168 | return 0; | |
169 | } else { | |
170 | if (!bitmap) | |
171 | return 1; | |
172 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, | |
173 | bitmap); | |
174 | } | |
98322f22 | 175 | } |
4243cdc2 | 176 | } |
25030a7f GR |
177 | return 0; |
178 | } | |
179 | ||
30fff923 ED |
180 | /* |
181 | * Note: we still hold spinlock of primary hash chain, so no other writer | |
182 | * can insert/delete a socket with local_port == num | |
183 | */ | |
184 | static int udp_lib_lport_inuse2(struct net *net, __u16 num, | |
4243cdc2 | 185 | struct udp_hslot *hslot2, |
fe38d2a1 | 186 | struct sock *sk) |
30fff923 ED |
187 | { |
188 | struct sock *sk2; | |
ba418fa3 | 189 | kuid_t uid = sock_i_uid(sk); |
30fff923 ED |
190 | int res = 0; |
191 | ||
192 | spin_lock(&hslot2->lock); | |
ca065d0c | 193 | udp_portaddr_for_each_entry(sk2, &hslot2->head) { |
9d4fb27d JP |
194 | if (net_eq(sock_net(sk2), net) && |
195 | sk2 != sk && | |
196 | (udp_sk(sk2)->udp_port_hash == num) && | |
197 | (!sk2->sk_reuse || !sk->sk_reuse) && | |
198 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
199 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
fe38d2a1 | 200 | inet_rcv_saddr_equal(sk, sk2, true)) { |
df560056 EG |
201 | if (sk2->sk_reuseport && sk->sk_reuseport && |
202 | !rcu_access_pointer(sk->sk_reuseport_cb) && | |
203 | uid_eq(uid, sock_i_uid(sk2))) { | |
204 | res = 0; | |
205 | } else { | |
206 | res = 1; | |
207 | } | |
30fff923 ED |
208 | break; |
209 | } | |
4243cdc2 | 210 | } |
30fff923 ED |
211 | spin_unlock(&hslot2->lock); |
212 | return res; | |
213 | } | |
214 | ||
fe38d2a1 | 215 | static int udp_reuseport_add_sock(struct sock *sk, struct udp_hslot *hslot) |
e32ea7e7 CG |
216 | { |
217 | struct net *net = sock_net(sk); | |
e32ea7e7 CG |
218 | kuid_t uid = sock_i_uid(sk); |
219 | struct sock *sk2; | |
220 | ||
ca065d0c | 221 | sk_for_each(sk2, &hslot->head) { |
e32ea7e7 CG |
222 | if (net_eq(sock_net(sk2), net) && |
223 | sk2 != sk && | |
224 | sk2->sk_family == sk->sk_family && | |
225 | ipv6_only_sock(sk2) == ipv6_only_sock(sk) && | |
226 | (udp_sk(sk2)->udp_port_hash == udp_sk(sk)->udp_port_hash) && | |
227 | (sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
228 | sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) && | |
fe38d2a1 | 229 | inet_rcv_saddr_equal(sk, sk2, false)) { |
e32ea7e7 CG |
230 | return reuseport_add_sock(sk, sk2); |
231 | } | |
232 | } | |
233 | ||
1b5f962e | 234 | return reuseport_alloc(sk); |
e32ea7e7 CG |
235 | } |
236 | ||
25030a7f | 237 | /** |
6ba5a3c5 | 238 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
25030a7f GR |
239 | * |
240 | * @sk: socket struct in question | |
241 | * @snum: port number to look up | |
25985edc | 242 | * @hash2_nulladdr: AF-dependent hash value in secondary hash chains, |
30fff923 | 243 | * with NULL address |
25030a7f | 244 | */ |
6ba5a3c5 | 245 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
30fff923 | 246 | unsigned int hash2_nulladdr) |
25030a7f | 247 | { |
512615b6 | 248 | struct udp_hslot *hslot, *hslot2; |
645ca708 | 249 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
25030a7f | 250 | int error = 1; |
3b1e0a65 | 251 | struct net *net = sock_net(sk); |
1da177e4 | 252 | |
32c1da70 | 253 | if (!snum) { |
9088c560 | 254 | int low, high, remaining; |
95c96174 | 255 | unsigned int rand; |
98322f22 ED |
256 | unsigned short first, last; |
257 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); | |
32c1da70 | 258 | |
0bbf87d8 | 259 | inet_get_local_port_range(net, &low, &high); |
a25de534 | 260 | remaining = (high - low) + 1; |
227b60f5 | 261 | |
63862b5b | 262 | rand = prandom_u32(); |
8fc54f68 | 263 | first = reciprocal_scale(rand, remaining) + low; |
98322f22 ED |
264 | /* |
265 | * force rand to be an odd multiple of UDP_HTABLE_SIZE | |
266 | */ | |
f86dcc5a | 267 | rand = (rand | 1) * (udptable->mask + 1); |
5781b235 ED |
268 | last = first + udptable->mask + 1; |
269 | do { | |
f86dcc5a | 270 | hslot = udp_hashslot(udptable, net, first); |
98322f22 | 271 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
645ca708 | 272 | spin_lock_bh(&hslot->lock); |
98322f22 | 273 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
fe38d2a1 | 274 | udptable->log); |
98322f22 ED |
275 | |
276 | snum = first; | |
277 | /* | |
278 | * Iterate on all possible values of snum for this hash. | |
279 | * Using steps of an odd multiple of UDP_HTABLE_SIZE | |
280 | * give us randomization and full range coverage. | |
281 | */ | |
9088c560 | 282 | do { |
98322f22 | 283 | if (low <= snum && snum <= high && |
e3826f1e | 284 | !test_bit(snum >> udptable->log, bitmap) && |
122ff243 | 285 | !inet_is_local_reserved_port(net, snum)) |
98322f22 ED |
286 | goto found; |
287 | snum += rand; | |
288 | } while (snum != first); | |
289 | spin_unlock_bh(&hslot->lock); | |
df560056 | 290 | cond_resched(); |
5781b235 | 291 | } while (++first != last); |
98322f22 | 292 | goto fail; |
645ca708 | 293 | } else { |
f86dcc5a | 294 | hslot = udp_hashslot(udptable, net, snum); |
645ca708 | 295 | spin_lock_bh(&hslot->lock); |
30fff923 ED |
296 | if (hslot->count > 10) { |
297 | int exist; | |
298 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; | |
299 | ||
300 | slot2 &= udptable->mask; | |
301 | hash2_nulladdr &= udptable->mask; | |
302 | ||
303 | hslot2 = udp_hashslot2(udptable, slot2); | |
304 | if (hslot->count < hslot2->count) | |
305 | goto scan_primary_hash; | |
306 | ||
fe38d2a1 | 307 | exist = udp_lib_lport_inuse2(net, snum, hslot2, sk); |
30fff923 ED |
308 | if (!exist && (hash2_nulladdr != slot2)) { |
309 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); | |
310 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
fe38d2a1 | 311 | sk); |
30fff923 ED |
312 | } |
313 | if (exist) | |
314 | goto fail_unlock; | |
315 | else | |
316 | goto found; | |
317 | } | |
318 | scan_primary_hash: | |
fe38d2a1 | 319 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, 0)) |
645ca708 ED |
320 | goto fail_unlock; |
321 | } | |
98322f22 | 322 | found: |
c720c7e8 | 323 | inet_sk(sk)->inet_num = snum; |
d4cada4a ED |
324 | udp_sk(sk)->udp_port_hash = snum; |
325 | udp_sk(sk)->udp_portaddr_hash ^= snum; | |
1da177e4 | 326 | if (sk_unhashed(sk)) { |
e32ea7e7 | 327 | if (sk->sk_reuseport && |
fe38d2a1 | 328 | udp_reuseport_add_sock(sk, hslot)) { |
e32ea7e7 CG |
329 | inet_sk(sk)->inet_num = 0; |
330 | udp_sk(sk)->udp_port_hash = 0; | |
331 | udp_sk(sk)->udp_portaddr_hash ^= snum; | |
332 | goto fail_unlock; | |
333 | } | |
334 | ||
ca065d0c | 335 | sk_add_node_rcu(sk, &hslot->head); |
fdcc8aa9 | 336 | hslot->count++; |
c29a0bc4 | 337 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
512615b6 ED |
338 | |
339 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
340 | spin_lock(&hslot2->lock); | |
d894ba18 | 341 | if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport && |
1602f49b DM |
342 | sk->sk_family == AF_INET6) |
343 | hlist_add_tail_rcu(&udp_sk(sk)->udp_portaddr_node, | |
344 | &hslot2->head); | |
d894ba18 | 345 | else |
1602f49b DM |
346 | hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
347 | &hslot2->head); | |
512615b6 ED |
348 | hslot2->count++; |
349 | spin_unlock(&hslot2->lock); | |
1da177e4 | 350 | } |
ca065d0c | 351 | sock_set_flag(sk, SOCK_RCU_FREE); |
25030a7f | 352 | error = 0; |
645ca708 ED |
353 | fail_unlock: |
354 | spin_unlock_bh(&hslot->lock); | |
1da177e4 | 355 | fail: |
25030a7f GR |
356 | return error; |
357 | } | |
c482c568 | 358 | EXPORT_SYMBOL(udp_lib_get_port); |
25030a7f | 359 | |
6eada011 ED |
360 | static u32 udp4_portaddr_hash(const struct net *net, __be32 saddr, |
361 | unsigned int port) | |
d4cada4a | 362 | { |
0eae88f3 | 363 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
d4cada4a ED |
364 | } |
365 | ||
6ba5a3c5 | 366 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
db8dac20 | 367 | { |
30fff923 | 368 | unsigned int hash2_nulladdr = |
0eae88f3 | 369 | udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum); |
30fff923 ED |
370 | unsigned int hash2_partial = |
371 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); | |
372 | ||
d4cada4a | 373 | /* precompute partial secondary hash */ |
30fff923 | 374 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
fe38d2a1 | 375 | return udp_lib_get_port(sk, snum, hash2_nulladdr); |
db8dac20 DM |
376 | } |
377 | ||
d1e37288 SX |
378 | static int compute_score(struct sock *sk, struct net *net, |
379 | __be32 saddr, __be16 sport, | |
fb74c277 DA |
380 | __be32 daddr, unsigned short hnum, |
381 | int dif, int sdif, bool exact_dif) | |
645ca708 | 382 | { |
60c04aec JP |
383 | int score; |
384 | struct inet_sock *inet; | |
645ca708 | 385 | |
60c04aec JP |
386 | if (!net_eq(sock_net(sk), net) || |
387 | udp_sk(sk)->udp_port_hash != hnum || | |
388 | ipv6_only_sock(sk)) | |
389 | return -1; | |
645ca708 | 390 | |
60c04aec JP |
391 | score = (sk->sk_family == PF_INET) ? 2 : 1; |
392 | inet = inet_sk(sk); | |
393 | ||
394 | if (inet->inet_rcv_saddr) { | |
395 | if (inet->inet_rcv_saddr != daddr) | |
396 | return -1; | |
397 | score += 4; | |
645ca708 | 398 | } |
60c04aec JP |
399 | |
400 | if (inet->inet_daddr) { | |
401 | if (inet->inet_daddr != saddr) | |
402 | return -1; | |
403 | score += 4; | |
404 | } | |
405 | ||
406 | if (inet->inet_dport) { | |
407 | if (inet->inet_dport != sport) | |
408 | return -1; | |
409 | score += 4; | |
410 | } | |
411 | ||
63a6fff3 | 412 | if (sk->sk_bound_dev_if || exact_dif) { |
fb74c277 DA |
413 | bool dev_match = (sk->sk_bound_dev_if == dif || |
414 | sk->sk_bound_dev_if == sdif); | |
415 | ||
720e76c1 | 416 | if (!dev_match) |
60c04aec | 417 | return -1; |
720e76c1 | 418 | if (sk->sk_bound_dev_if) |
fb74c277 | 419 | score += 4; |
60c04aec | 420 | } |
fb74c277 | 421 | |
70da268b ED |
422 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
423 | score++; | |
645ca708 ED |
424 | return score; |
425 | } | |
426 | ||
6eada011 ED |
427 | static u32 udp_ehashfn(const struct net *net, const __be32 laddr, |
428 | const __u16 lport, const __be32 faddr, | |
429 | const __be16 fport) | |
65cd8033 | 430 | { |
1bbdceef HFS |
431 | static u32 udp_ehash_secret __read_mostly; |
432 | ||
433 | net_get_random_once(&udp_ehash_secret, sizeof(udp_ehash_secret)); | |
434 | ||
65cd8033 | 435 | return __inet_ehashfn(laddr, lport, faddr, fport, |
1bbdceef | 436 | udp_ehash_secret + net_hash_mix(net)); |
65cd8033 HFS |
437 | } |
438 | ||
d1e37288 | 439 | /* called with rcu_read_lock() */ |
5051ebd2 | 440 | static struct sock *udp4_lib_lookup2(struct net *net, |
fb74c277 DA |
441 | __be32 saddr, __be16 sport, |
442 | __be32 daddr, unsigned int hnum, | |
443 | int dif, int sdif, bool exact_dif, | |
444 | struct udp_hslot *hslot2, | |
445 | struct sk_buff *skb) | |
5051ebd2 ED |
446 | { |
447 | struct sock *sk, *result; | |
ba418fa3 TH |
448 | int score, badness, matches = 0, reuseport = 0; |
449 | u32 hash = 0; | |
5051ebd2 | 450 | |
5051ebd2 | 451 | result = NULL; |
ba418fa3 | 452 | badness = 0; |
ca065d0c | 453 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
d1e37288 | 454 | score = compute_score(sk, net, saddr, sport, |
fb74c277 | 455 | daddr, hnum, dif, sdif, exact_dif); |
5051ebd2 | 456 | if (score > badness) { |
ba418fa3 TH |
457 | reuseport = sk->sk_reuseport; |
458 | if (reuseport) { | |
65cd8033 HFS |
459 | hash = udp_ehashfn(net, daddr, hnum, |
460 | saddr, sport); | |
ca065d0c | 461 | result = reuseport_select_sock(sk, hash, skb, |
ed0dfffd | 462 | sizeof(struct udphdr)); |
ca065d0c ED |
463 | if (result) |
464 | return result; | |
ba418fa3 TH |
465 | matches = 1; |
466 | } | |
ca065d0c ED |
467 | badness = score; |
468 | result = sk; | |
ba418fa3 TH |
469 | } else if (score == badness && reuseport) { |
470 | matches++; | |
8fc54f68 | 471 | if (reciprocal_scale(hash, matches) == 0) |
ba418fa3 TH |
472 | result = sk; |
473 | hash = next_pseudo_random32(hash); | |
5051ebd2 ED |
474 | } |
475 | } | |
5051ebd2 ED |
476 | return result; |
477 | } | |
478 | ||
db8dac20 DM |
479 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
480 | * harder than this. -DaveM | |
481 | */ | |
fce82338 | 482 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, |
fb74c277 DA |
483 | __be16 sport, __be32 daddr, __be16 dport, int dif, |
484 | int sdif, struct udp_table *udptable, struct sk_buff *skb) | |
db8dac20 | 485 | { |
271b72c7 | 486 | struct sock *sk, *result; |
db8dac20 | 487 | unsigned short hnum = ntohs(dport); |
5051ebd2 ED |
488 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
489 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
63a6fff3 | 490 | bool exact_dif = udp_lib_exact_dif_match(net, skb); |
ba418fa3 TH |
491 | int score, badness, matches = 0, reuseport = 0; |
492 | u32 hash = 0; | |
645ca708 | 493 | |
5051ebd2 ED |
494 | if (hslot->count > 10) { |
495 | hash2 = udp4_portaddr_hash(net, daddr, hnum); | |
496 | slot2 = hash2 & udptable->mask; | |
497 | hslot2 = &udptable->hash2[slot2]; | |
498 | if (hslot->count < hslot2->count) | |
499 | goto begin; | |
500 | ||
501 | result = udp4_lib_lookup2(net, saddr, sport, | |
fb74c277 | 502 | daddr, hnum, dif, sdif, |
63a6fff3 | 503 | exact_dif, hslot2, skb); |
5051ebd2 | 504 | if (!result) { |
d1e37288 | 505 | unsigned int old_slot2 = slot2; |
0eae88f3 | 506 | hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
5051ebd2 | 507 | slot2 = hash2 & udptable->mask; |
d1e37288 SX |
508 | /* avoid searching the same slot again. */ |
509 | if (unlikely(slot2 == old_slot2)) | |
510 | return result; | |
511 | ||
5051ebd2 ED |
512 | hslot2 = &udptable->hash2[slot2]; |
513 | if (hslot->count < hslot2->count) | |
514 | goto begin; | |
515 | ||
1223c67c | 516 | result = udp4_lib_lookup2(net, saddr, sport, |
fb74c277 | 517 | daddr, hnum, dif, sdif, |
63a6fff3 | 518 | exact_dif, hslot2, skb); |
5051ebd2 | 519 | } |
5051ebd2 ED |
520 | return result; |
521 | } | |
271b72c7 ED |
522 | begin: |
523 | result = NULL; | |
ba418fa3 | 524 | badness = 0; |
ca065d0c | 525 | sk_for_each_rcu(sk, &hslot->head) { |
d1e37288 | 526 | score = compute_score(sk, net, saddr, sport, |
fb74c277 | 527 | daddr, hnum, dif, sdif, exact_dif); |
645ca708 | 528 | if (score > badness) { |
ba418fa3 TH |
529 | reuseport = sk->sk_reuseport; |
530 | if (reuseport) { | |
65cd8033 HFS |
531 | hash = udp_ehashfn(net, daddr, hnum, |
532 | saddr, sport); | |
ca065d0c | 533 | result = reuseport_select_sock(sk, hash, skb, |
538950a1 | 534 | sizeof(struct udphdr)); |
ca065d0c ED |
535 | if (result) |
536 | return result; | |
ba418fa3 TH |
537 | matches = 1; |
538 | } | |
ca065d0c ED |
539 | result = sk; |
540 | badness = score; | |
ba418fa3 TH |
541 | } else if (score == badness && reuseport) { |
542 | matches++; | |
8fc54f68 | 543 | if (reciprocal_scale(hash, matches) == 0) |
ba418fa3 TH |
544 | result = sk; |
545 | hash = next_pseudo_random32(hash); | |
db8dac20 DM |
546 | } |
547 | } | |
db8dac20 DM |
548 | return result; |
549 | } | |
fce82338 | 550 | EXPORT_SYMBOL_GPL(__udp4_lib_lookup); |
db8dac20 | 551 | |
607c4aaf KK |
552 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
553 | __be16 sport, __be16 dport, | |
645ca708 | 554 | struct udp_table *udptable) |
607c4aaf KK |
555 | { |
556 | const struct iphdr *iph = ip_hdr(skb); | |
557 | ||
ed7cbbce | 558 | return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport, |
8afdd99a | 559 | iph->daddr, dport, inet_iif(skb), |
fb74c277 | 560 | inet_sdif(skb), udptable, skb); |
607c4aaf KK |
561 | } |
562 | ||
63058308 TH |
563 | struct sock *udp4_lib_lookup_skb(struct sk_buff *skb, |
564 | __be16 sport, __be16 dport) | |
565 | { | |
b06ba4f1 MKL |
566 | const struct iphdr *iph = ip_hdr(skb); |
567 | ||
568 | return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport, | |
569 | iph->daddr, dport, inet_iif(skb), | |
570 | inet_sdif(skb), &udp_table, NULL); | |
63058308 TH |
571 | } |
572 | EXPORT_SYMBOL_GPL(udp4_lib_lookup_skb); | |
573 | ||
ca065d0c ED |
574 | /* Must be called under rcu_read_lock(). |
575 | * Does increment socket refcount. | |
576 | */ | |
577 | #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ | |
30f58158 AB |
578 | IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \ |
579 | IS_ENABLED(CONFIG_NF_SOCKET_IPV4) | |
bcd41303 KK |
580 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
581 | __be32 daddr, __be16 dport, int dif) | |
582 | { | |
ca065d0c ED |
583 | struct sock *sk; |
584 | ||
585 | sk = __udp4_lib_lookup(net, saddr, sport, daddr, dport, | |
fb74c277 | 586 | dif, 0, &udp_table, NULL); |
41c6d650 | 587 | if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) |
ca065d0c ED |
588 | sk = NULL; |
589 | return sk; | |
bcd41303 KK |
590 | } |
591 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); | |
ca065d0c | 592 | #endif |
bcd41303 | 593 | |
421b3885 SB |
594 | static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk, |
595 | __be16 loc_port, __be32 loc_addr, | |
596 | __be16 rmt_port, __be32 rmt_addr, | |
fb74c277 | 597 | int dif, int sdif, unsigned short hnum) |
421b3885 SB |
598 | { |
599 | struct inet_sock *inet = inet_sk(sk); | |
600 | ||
601 | if (!net_eq(sock_net(sk), net) || | |
602 | udp_sk(sk)->udp_port_hash != hnum || | |
603 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || | |
604 | (inet->inet_dport != rmt_port && inet->inet_dport) || | |
605 | (inet->inet_rcv_saddr && inet->inet_rcv_saddr != loc_addr) || | |
606 | ipv6_only_sock(sk) || | |
fb74c277 DA |
607 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif && |
608 | sk->sk_bound_dev_if != sdif)) | |
421b3885 | 609 | return false; |
60d9b031 | 610 | if (!ip_mc_sf_allow(sk, loc_addr, rmt_addr, dif, sdif)) |
421b3885 SB |
611 | return false; |
612 | return true; | |
613 | } | |
614 | ||
db8dac20 DM |
615 | /* |
616 | * This routine is called by the ICMP module when it gets some | |
617 | * sort of error condition. If err < 0 then the socket should | |
618 | * be closed and the error returned to the user. If err > 0 | |
619 | * it's just the icmp type << 8 | icmp code. | |
620 | * Header points to the ip header of the error packet. We move | |
621 | * on past this. Then (as it used to claim before adjustment) | |
622 | * header points to the first 8 bytes of the udp header. We need | |
623 | * to find the appropriate port. | |
624 | */ | |
625 | ||
645ca708 | 626 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) |
db8dac20 DM |
627 | { |
628 | struct inet_sock *inet; | |
b71d1d42 | 629 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
c482c568 | 630 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); |
db8dac20 DM |
631 | const int type = icmp_hdr(skb)->type; |
632 | const int code = icmp_hdr(skb)->code; | |
633 | struct sock *sk; | |
634 | int harderr; | |
635 | int err; | |
fd54d716 | 636 | struct net *net = dev_net(skb->dev); |
db8dac20 | 637 | |
fd54d716 | 638 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
fb74c277 DA |
639 | iph->saddr, uh->source, skb->dev->ifindex, 0, |
640 | udptable, NULL); | |
51456b29 | 641 | if (!sk) { |
5d3848bc | 642 | __ICMP_INC_STATS(net, ICMP_MIB_INERRORS); |
db8dac20 DM |
643 | return; /* No socket for error */ |
644 | } | |
645 | ||
646 | err = 0; | |
647 | harderr = 0; | |
648 | inet = inet_sk(sk); | |
649 | ||
650 | switch (type) { | |
651 | default: | |
652 | case ICMP_TIME_EXCEEDED: | |
653 | err = EHOSTUNREACH; | |
654 | break; | |
655 | case ICMP_SOURCE_QUENCH: | |
656 | goto out; | |
657 | case ICMP_PARAMETERPROB: | |
658 | err = EPROTO; | |
659 | harderr = 1; | |
660 | break; | |
661 | case ICMP_DEST_UNREACH: | |
662 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
36393395 | 663 | ipv4_sk_update_pmtu(skb, sk, info); |
db8dac20 DM |
664 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { |
665 | err = EMSGSIZE; | |
666 | harderr = 1; | |
667 | break; | |
668 | } | |
669 | goto out; | |
670 | } | |
671 | err = EHOSTUNREACH; | |
672 | if (code <= NR_ICMP_UNREACH) { | |
673 | harderr = icmp_err_convert[code].fatal; | |
674 | err = icmp_err_convert[code].errno; | |
675 | } | |
676 | break; | |
55be7a9c DM |
677 | case ICMP_REDIRECT: |
678 | ipv4_sk_redirect(skb, sk); | |
1a462d18 | 679 | goto out; |
db8dac20 DM |
680 | } |
681 | ||
682 | /* | |
683 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
684 | * 4.1.3.3. | |
685 | */ | |
686 | if (!inet->recverr) { | |
687 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
688 | goto out; | |
b1faf566 | 689 | } else |
c482c568 | 690 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
b1faf566 | 691 | |
db8dac20 DM |
692 | sk->sk_err = err; |
693 | sk->sk_error_report(sk); | |
694 | out: | |
ca065d0c | 695 | return; |
db8dac20 DM |
696 | } |
697 | ||
698 | void udp_err(struct sk_buff *skb, u32 info) | |
699 | { | |
645ca708 | 700 | __udp4_lib_err(skb, info, &udp_table); |
db8dac20 DM |
701 | } |
702 | ||
703 | /* | |
704 | * Throw away all pending data and cancel the corking. Socket is locked. | |
705 | */ | |
36d926b9 | 706 | void udp_flush_pending_frames(struct sock *sk) |
db8dac20 DM |
707 | { |
708 | struct udp_sock *up = udp_sk(sk); | |
709 | ||
710 | if (up->pending) { | |
711 | up->len = 0; | |
712 | up->pending = 0; | |
713 | ip_flush_pending_frames(sk); | |
714 | } | |
715 | } | |
36d926b9 | 716 | EXPORT_SYMBOL(udp_flush_pending_frames); |
db8dac20 DM |
717 | |
718 | /** | |
f6b9664f | 719 | * udp4_hwcsum - handle outgoing HW checksumming |
db8dac20 DM |
720 | * @skb: sk_buff containing the filled-in UDP header |
721 | * (checksum field must be zeroed out) | |
f6b9664f HX |
722 | * @src: source IP address |
723 | * @dst: destination IP address | |
db8dac20 | 724 | */ |
c26bf4a5 | 725 | void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst) |
db8dac20 | 726 | { |
db8dac20 | 727 | struct udphdr *uh = udp_hdr(skb); |
f6b9664f HX |
728 | int offset = skb_transport_offset(skb); |
729 | int len = skb->len - offset; | |
730 | int hlen = len; | |
db8dac20 DM |
731 | __wsum csum = 0; |
732 | ||
ebbe495f | 733 | if (!skb_has_frag_list(skb)) { |
db8dac20 DM |
734 | /* |
735 | * Only one fragment on the socket. | |
736 | */ | |
737 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
738 | skb->csum_offset = offsetof(struct udphdr, check); | |
f6b9664f HX |
739 | uh->check = ~csum_tcpudp_magic(src, dst, len, |
740 | IPPROTO_UDP, 0); | |
db8dac20 | 741 | } else { |
ebbe495f WC |
742 | struct sk_buff *frags; |
743 | ||
db8dac20 DM |
744 | /* |
745 | * HW-checksum won't work as there are two or more | |
746 | * fragments on the socket so that all csums of sk_buffs | |
747 | * should be together | |
748 | */ | |
ebbe495f | 749 | skb_walk_frags(skb, frags) { |
f6b9664f HX |
750 | csum = csum_add(csum, frags->csum); |
751 | hlen -= frags->len; | |
ebbe495f | 752 | } |
db8dac20 | 753 | |
f6b9664f | 754 | csum = skb_checksum(skb, offset, hlen, csum); |
db8dac20 DM |
755 | skb->ip_summed = CHECKSUM_NONE; |
756 | ||
db8dac20 DM |
757 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); |
758 | if (uh->check == 0) | |
759 | uh->check = CSUM_MANGLED_0; | |
760 | } | |
761 | } | |
c26bf4a5 | 762 | EXPORT_SYMBOL_GPL(udp4_hwcsum); |
db8dac20 | 763 | |
af5fcba7 TH |
764 | /* Function to set UDP checksum for an IPv4 UDP packet. This is intended |
765 | * for the simple case like when setting the checksum for a UDP tunnel. | |
766 | */ | |
767 | void udp_set_csum(bool nocheck, struct sk_buff *skb, | |
768 | __be32 saddr, __be32 daddr, int len) | |
769 | { | |
770 | struct udphdr *uh = udp_hdr(skb); | |
771 | ||
179bc67f | 772 | if (nocheck) { |
af5fcba7 | 773 | uh->check = 0; |
179bc67f | 774 | } else if (skb_is_gso(skb)) { |
af5fcba7 | 775 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); |
179bc67f EC |
776 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { |
777 | uh->check = 0; | |
778 | uh->check = udp_v4_check(len, saddr, daddr, lco_csum(skb)); | |
779 | if (uh->check == 0) | |
780 | uh->check = CSUM_MANGLED_0; | |
d75f1306 | 781 | } else { |
af5fcba7 TH |
782 | skb->ip_summed = CHECKSUM_PARTIAL; |
783 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
784 | skb->csum_offset = offsetof(struct udphdr, check); | |
785 | uh->check = ~udp_v4_check(len, saddr, daddr, 0); | |
af5fcba7 TH |
786 | } |
787 | } | |
788 | EXPORT_SYMBOL(udp_set_csum); | |
789 | ||
79ab0531 | 790 | static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4) |
db8dac20 | 791 | { |
f6b9664f | 792 | struct sock *sk = skb->sk; |
db8dac20 | 793 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
794 | struct udphdr *uh; |
795 | int err = 0; | |
796 | int is_udplite = IS_UDPLITE(sk); | |
f6b9664f HX |
797 | int offset = skb_transport_offset(skb); |
798 | int len = skb->len - offset; | |
db8dac20 DM |
799 | __wsum csum = 0; |
800 | ||
db8dac20 DM |
801 | /* |
802 | * Create a UDP header | |
803 | */ | |
804 | uh = udp_hdr(skb); | |
f6b9664f | 805 | uh->source = inet->inet_sport; |
79ab0531 | 806 | uh->dest = fl4->fl4_dport; |
f6b9664f | 807 | uh->len = htons(len); |
db8dac20 DM |
808 | uh->check = 0; |
809 | ||
810 | if (is_udplite) /* UDP-Lite */ | |
f6b9664f | 811 | csum = udplite_csum(skb); |
db8dac20 | 812 | |
ab2fb7e3 | 813 | else if (sk->sk_no_check_tx) { /* UDP csum off */ |
db8dac20 DM |
814 | |
815 | skb->ip_summed = CHECKSUM_NONE; | |
816 | goto send; | |
817 | ||
818 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
819 | ||
79ab0531 | 820 | udp4_hwcsum(skb, fl4->saddr, fl4->daddr); |
db8dac20 DM |
821 | goto send; |
822 | ||
f6b9664f HX |
823 | } else |
824 | csum = udp_csum(skb); | |
db8dac20 DM |
825 | |
826 | /* add protocol-dependent pseudo-header */ | |
79ab0531 | 827 | uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len, |
c482c568 | 828 | sk->sk_protocol, csum); |
db8dac20 DM |
829 | if (uh->check == 0) |
830 | uh->check = CSUM_MANGLED_0; | |
831 | ||
832 | send: | |
b5ec8eea | 833 | err = ip_send_skb(sock_net(sk), skb); |
6ce9e7b5 ED |
834 | if (err) { |
835 | if (err == -ENOBUFS && !inet->recverr) { | |
6aef70a8 ED |
836 | UDP_INC_STATS(sock_net(sk), |
837 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
838 | err = 0; |
839 | } | |
840 | } else | |
6aef70a8 ED |
841 | UDP_INC_STATS(sock_net(sk), |
842 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
f6b9664f HX |
843 | return err; |
844 | } | |
845 | ||
846 | /* | |
847 | * Push out all pending data as one UDP datagram. Socket is locked. | |
848 | */ | |
8822b64a | 849 | int udp_push_pending_frames(struct sock *sk) |
f6b9664f HX |
850 | { |
851 | struct udp_sock *up = udp_sk(sk); | |
852 | struct inet_sock *inet = inet_sk(sk); | |
b6f21b26 | 853 | struct flowi4 *fl4 = &inet->cork.fl.u.ip4; |
f6b9664f HX |
854 | struct sk_buff *skb; |
855 | int err = 0; | |
856 | ||
77968b78 | 857 | skb = ip_finish_skb(sk, fl4); |
f6b9664f HX |
858 | if (!skb) |
859 | goto out; | |
860 | ||
79ab0531 | 861 | err = udp_send_skb(skb, fl4); |
f6b9664f | 862 | |
db8dac20 DM |
863 | out: |
864 | up->len = 0; | |
865 | up->pending = 0; | |
db8dac20 DM |
866 | return err; |
867 | } | |
8822b64a | 868 | EXPORT_SYMBOL(udp_push_pending_frames); |
db8dac20 | 869 | |
1b784140 | 870 | int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
db8dac20 DM |
871 | { |
872 | struct inet_sock *inet = inet_sk(sk); | |
873 | struct udp_sock *up = udp_sk(sk); | |
e474995f | 874 | struct flowi4 fl4_stack; |
b6f21b26 | 875 | struct flowi4 *fl4; |
db8dac20 DM |
876 | int ulen = len; |
877 | struct ipcm_cookie ipc; | |
878 | struct rtable *rt = NULL; | |
879 | int free = 0; | |
880 | int connected = 0; | |
881 | __be32 daddr, faddr, saddr; | |
882 | __be16 dport; | |
883 | u8 tos; | |
884 | int err, is_udplite = IS_UDPLITE(sk); | |
885 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; | |
886 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); | |
903ab86d | 887 | struct sk_buff *skb; |
f6d8bd05 | 888 | struct ip_options_data opt_copy; |
db8dac20 DM |
889 | |
890 | if (len > 0xFFFF) | |
891 | return -EMSGSIZE; | |
892 | ||
893 | /* | |
894 | * Check the flags. | |
895 | */ | |
896 | ||
c482c568 | 897 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
db8dac20 DM |
898 | return -EOPNOTSUPP; |
899 | ||
900 | ipc.opt = NULL; | |
2244d07b | 901 | ipc.tx_flags = 0; |
aa661581 FF |
902 | ipc.ttl = 0; |
903 | ipc.tos = -1; | |
db8dac20 | 904 | |
903ab86d HX |
905 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
906 | ||
f5fca608 | 907 | fl4 = &inet->cork.fl.u.ip4; |
db8dac20 DM |
908 | if (up->pending) { |
909 | /* | |
910 | * There are pending frames. | |
911 | * The socket lock must be held while it's corked. | |
912 | */ | |
913 | lock_sock(sk); | |
914 | if (likely(up->pending)) { | |
915 | if (unlikely(up->pending != AF_INET)) { | |
916 | release_sock(sk); | |
917 | return -EINVAL; | |
918 | } | |
919 | goto do_append_data; | |
920 | } | |
921 | release_sock(sk); | |
922 | } | |
923 | ulen += sizeof(struct udphdr); | |
924 | ||
925 | /* | |
926 | * Get and verify the address. | |
927 | */ | |
928 | if (msg->msg_name) { | |
342dfc30 | 929 | DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name); |
db8dac20 DM |
930 | if (msg->msg_namelen < sizeof(*usin)) |
931 | return -EINVAL; | |
932 | if (usin->sin_family != AF_INET) { | |
933 | if (usin->sin_family != AF_UNSPEC) | |
934 | return -EAFNOSUPPORT; | |
935 | } | |
936 | ||
937 | daddr = usin->sin_addr.s_addr; | |
938 | dport = usin->sin_port; | |
939 | if (dport == 0) | |
940 | return -EINVAL; | |
941 | } else { | |
942 | if (sk->sk_state != TCP_ESTABLISHED) | |
943 | return -EDESTADDRREQ; | |
c720c7e8 ED |
944 | daddr = inet->inet_daddr; |
945 | dport = inet->inet_dport; | |
db8dac20 DM |
946 | /* Open fast path for connected socket. |
947 | Route will not be used, if at least one option is set. | |
948 | */ | |
949 | connected = 1; | |
950 | } | |
db8dac20 | 951 | |
c14ac945 SHY |
952 | ipc.sockc.tsflags = sk->sk_tsflags; |
953 | ipc.addr = inet->inet_saddr; | |
db8dac20 | 954 | ipc.oif = sk->sk_bound_dev_if; |
bf84a010 | 955 | |
db8dac20 | 956 | if (msg->msg_controllen) { |
24025c46 | 957 | err = ip_cmsg_send(sk, msg, &ipc, sk->sk_family == AF_INET6); |
91948309 ED |
958 | if (unlikely(err)) { |
959 | kfree(ipc.opt); | |
db8dac20 | 960 | return err; |
91948309 | 961 | } |
db8dac20 DM |
962 | if (ipc.opt) |
963 | free = 1; | |
964 | connected = 0; | |
965 | } | |
f6d8bd05 ED |
966 | if (!ipc.opt) { |
967 | struct ip_options_rcu *inet_opt; | |
968 | ||
969 | rcu_read_lock(); | |
970 | inet_opt = rcu_dereference(inet->inet_opt); | |
971 | if (inet_opt) { | |
972 | memcpy(&opt_copy, inet_opt, | |
973 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
974 | ipc.opt = &opt_copy.opt; | |
975 | } | |
976 | rcu_read_unlock(); | |
977 | } | |
db8dac20 DM |
978 | |
979 | saddr = ipc.addr; | |
980 | ipc.addr = faddr = daddr; | |
981 | ||
c14ac945 SHY |
982 | sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags); |
983 | ||
f6d8bd05 | 984 | if (ipc.opt && ipc.opt->opt.srr) { |
6c4db23a AI |
985 | if (!daddr) { |
986 | err = -EINVAL; | |
987 | goto out_free; | |
988 | } | |
f6d8bd05 | 989 | faddr = ipc.opt->opt.faddr; |
db8dac20 DM |
990 | connected = 0; |
991 | } | |
aa661581 | 992 | tos = get_rttos(&ipc, inet); |
db8dac20 DM |
993 | if (sock_flag(sk, SOCK_LOCALROUTE) || |
994 | (msg->msg_flags & MSG_DONTROUTE) || | |
f6d8bd05 | 995 | (ipc.opt && ipc.opt->opt.is_strictroute)) { |
db8dac20 DM |
996 | tos |= RTO_ONLINK; |
997 | connected = 0; | |
998 | } | |
999 | ||
1000 | if (ipv4_is_multicast(daddr)) { | |
1001 | if (!ipc.oif) | |
1002 | ipc.oif = inet->mc_index; | |
1003 | if (!saddr) | |
1004 | saddr = inet->mc_addr; | |
1005 | connected = 0; | |
76e21053 EH |
1006 | } else if (!ipc.oif) |
1007 | ipc.oif = inet->uc_index; | |
db8dac20 DM |
1008 | |
1009 | if (connected) | |
c482c568 | 1010 | rt = (struct rtable *)sk_dst_check(sk, 0); |
db8dac20 | 1011 | |
51456b29 | 1012 | if (!rt) { |
84a3aa00 | 1013 | struct net *net = sock_net(sk); |
9a24abfa | 1014 | __u8 flow_flags = inet_sk_flowi_flags(sk); |
84a3aa00 | 1015 | |
e474995f | 1016 | fl4 = &fl4_stack; |
9a24abfa | 1017 | |
e474995f | 1018 | flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos, |
c0951cbc | 1019 | RT_SCOPE_UNIVERSE, sk->sk_protocol, |
9a24abfa | 1020 | flow_flags, |
e2d118a1 LC |
1021 | faddr, saddr, dport, inet->inet_sport, |
1022 | sk->sk_uid); | |
c0951cbc | 1023 | |
e474995f DM |
1024 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
1025 | rt = ip_route_output_flow(net, fl4, sk); | |
b23dd4fe DM |
1026 | if (IS_ERR(rt)) { |
1027 | err = PTR_ERR(rt); | |
06dc94b1 | 1028 | rt = NULL; |
db8dac20 | 1029 | if (err == -ENETUNREACH) |
f1d8cba6 | 1030 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
db8dac20 DM |
1031 | goto out; |
1032 | } | |
1033 | ||
1034 | err = -EACCES; | |
1035 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
1036 | !sock_flag(sk, SOCK_BROADCAST)) | |
1037 | goto out; | |
1038 | if (connected) | |
d8d1f30b | 1039 | sk_dst_set(sk, dst_clone(&rt->dst)); |
db8dac20 DM |
1040 | } |
1041 | ||
1042 | if (msg->msg_flags&MSG_CONFIRM) | |
1043 | goto do_confirm; | |
1044 | back_from_confirm: | |
1045 | ||
e474995f | 1046 | saddr = fl4->saddr; |
db8dac20 | 1047 | if (!ipc.addr) |
e474995f | 1048 | daddr = ipc.addr = fl4->daddr; |
db8dac20 | 1049 | |
903ab86d HX |
1050 | /* Lockless fast path for the non-corking case. */ |
1051 | if (!corkreq) { | |
f69e6d13 | 1052 | skb = ip_make_skb(sk, fl4, getfrag, msg, ulen, |
903ab86d HX |
1053 | sizeof(struct udphdr), &ipc, &rt, |
1054 | msg->msg_flags); | |
1055 | err = PTR_ERR(skb); | |
50c3a487 | 1056 | if (!IS_ERR_OR_NULL(skb)) |
79ab0531 | 1057 | err = udp_send_skb(skb, fl4); |
903ab86d HX |
1058 | goto out; |
1059 | } | |
1060 | ||
db8dac20 DM |
1061 | lock_sock(sk); |
1062 | if (unlikely(up->pending)) { | |
1063 | /* The socket is already corked while preparing it. */ | |
1064 | /* ... which is an evident application bug. --ANK */ | |
1065 | release_sock(sk); | |
1066 | ||
197df02c | 1067 | net_dbg_ratelimited("socket already corked\n"); |
db8dac20 DM |
1068 | err = -EINVAL; |
1069 | goto out; | |
1070 | } | |
1071 | /* | |
1072 | * Now cork the socket to pend data. | |
1073 | */ | |
b6f21b26 DM |
1074 | fl4 = &inet->cork.fl.u.ip4; |
1075 | fl4->daddr = daddr; | |
1076 | fl4->saddr = saddr; | |
9cce96df DM |
1077 | fl4->fl4_dport = dport; |
1078 | fl4->fl4_sport = inet->inet_sport; | |
db8dac20 DM |
1079 | up->pending = AF_INET; |
1080 | ||
1081 | do_append_data: | |
1082 | up->len += ulen; | |
f69e6d13 | 1083 | err = ip_append_data(sk, fl4, getfrag, msg, ulen, |
f5fca608 DM |
1084 | sizeof(struct udphdr), &ipc, &rt, |
1085 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); | |
db8dac20 DM |
1086 | if (err) |
1087 | udp_flush_pending_frames(sk); | |
1088 | else if (!corkreq) | |
1089 | err = udp_push_pending_frames(sk); | |
1090 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) | |
1091 | up->pending = 0; | |
1092 | release_sock(sk); | |
1093 | ||
1094 | out: | |
1095 | ip_rt_put(rt); | |
6c4db23a | 1096 | out_free: |
db8dac20 DM |
1097 | if (free) |
1098 | kfree(ipc.opt); | |
1099 | if (!err) | |
1100 | return len; | |
1101 | /* | |
1102 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1103 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1104 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1105 | * things). We could add another new stat but at least for now that | |
1106 | * seems like overkill. | |
1107 | */ | |
1108 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1109 | UDP_INC_STATS(sock_net(sk), |
1110 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
db8dac20 DM |
1111 | } |
1112 | return err; | |
1113 | ||
1114 | do_confirm: | |
0dec879f JA |
1115 | if (msg->msg_flags & MSG_PROBE) |
1116 | dst_confirm_neigh(&rt->dst, &fl4->daddr); | |
db8dac20 DM |
1117 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1118 | goto back_from_confirm; | |
1119 | err = 0; | |
1120 | goto out; | |
1121 | } | |
c482c568 | 1122 | EXPORT_SYMBOL(udp_sendmsg); |
db8dac20 DM |
1123 | |
1124 | int udp_sendpage(struct sock *sk, struct page *page, int offset, | |
1125 | size_t size, int flags) | |
1126 | { | |
f5fca608 | 1127 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
1128 | struct udp_sock *up = udp_sk(sk); |
1129 | int ret; | |
1130 | ||
d3f7d56a SL |
1131 | if (flags & MSG_SENDPAGE_NOTLAST) |
1132 | flags |= MSG_MORE; | |
1133 | ||
db8dac20 DM |
1134 | if (!up->pending) { |
1135 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; | |
1136 | ||
1137 | /* Call udp_sendmsg to specify destination address which | |
1138 | * sendpage interface can't pass. | |
1139 | * This will succeed only when the socket is connected. | |
1140 | */ | |
1b784140 | 1141 | ret = udp_sendmsg(sk, &msg, 0); |
db8dac20 DM |
1142 | if (ret < 0) |
1143 | return ret; | |
1144 | } | |
1145 | ||
1146 | lock_sock(sk); | |
1147 | ||
1148 | if (unlikely(!up->pending)) { | |
1149 | release_sock(sk); | |
1150 | ||
197df02c | 1151 | net_dbg_ratelimited("cork failed\n"); |
db8dac20 DM |
1152 | return -EINVAL; |
1153 | } | |
1154 | ||
f5fca608 DM |
1155 | ret = ip_append_page(sk, &inet->cork.fl.u.ip4, |
1156 | page, offset, size, flags); | |
db8dac20 DM |
1157 | if (ret == -EOPNOTSUPP) { |
1158 | release_sock(sk); | |
1159 | return sock_no_sendpage(sk->sk_socket, page, offset, | |
1160 | size, flags); | |
1161 | } | |
1162 | if (ret < 0) { | |
1163 | udp_flush_pending_frames(sk); | |
1164 | goto out; | |
1165 | } | |
1166 | ||
1167 | up->len += size; | |
1168 | if (!(up->corkflag || (flags&MSG_MORE))) | |
1169 | ret = udp_push_pending_frames(sk); | |
1170 | if (!ret) | |
1171 | ret = size; | |
1172 | out: | |
1173 | release_sock(sk); | |
1174 | return ret; | |
1175 | } | |
1176 | ||
dce4551c PA |
1177 | #define UDP_SKB_IS_STATELESS 0x80000000 |
1178 | ||
b65ac446 PA |
1179 | static void udp_set_dev_scratch(struct sk_buff *skb) |
1180 | { | |
dce4551c | 1181 | struct udp_dev_scratch *scratch = udp_skb_scratch(skb); |
b65ac446 PA |
1182 | |
1183 | BUILD_BUG_ON(sizeof(struct udp_dev_scratch) > sizeof(long)); | |
dce4551c PA |
1184 | scratch->_tsize_state = skb->truesize; |
1185 | #if BITS_PER_LONG == 64 | |
b65ac446 PA |
1186 | scratch->len = skb->len; |
1187 | scratch->csum_unnecessary = !!skb_csum_unnecessary(skb); | |
1188 | scratch->is_linear = !skb_is_nonlinear(skb); | |
dce4551c | 1189 | #endif |
3bdefdf9 PA |
1190 | /* all head states execept sp (dst, sk, nf) are always cleared by |
1191 | * udp_rcv() and we need to preserve secpath, if present, to eventually | |
1192 | * process IP_CMSG_PASSSEC at recvmsg() time | |
1193 | */ | |
1194 | if (likely(!skb_sec_path(skb))) | |
dce4551c | 1195 | scratch->_tsize_state |= UDP_SKB_IS_STATELESS; |
b65ac446 PA |
1196 | } |
1197 | ||
1198 | static int udp_skb_truesize(struct sk_buff *skb) | |
1199 | { | |
dce4551c | 1200 | return udp_skb_scratch(skb)->_tsize_state & ~UDP_SKB_IS_STATELESS; |
b65ac446 PA |
1201 | } |
1202 | ||
dce4551c | 1203 | static bool udp_skb_has_head_state(struct sk_buff *skb) |
b65ac446 | 1204 | { |
dce4551c | 1205 | return !(udp_skb_scratch(skb)->_tsize_state & UDP_SKB_IS_STATELESS); |
b65ac446 | 1206 | } |
b65ac446 | 1207 | |
7c13f97f | 1208 | /* fully reclaim rmem/fwd memory allocated for skb */ |
6dfb4367 PA |
1209 | static void udp_rmem_release(struct sock *sk, int size, int partial, |
1210 | bool rx_queue_lock_held) | |
f970bd9e | 1211 | { |
6b229cf7 | 1212 | struct udp_sock *up = udp_sk(sk); |
2276f58a | 1213 | struct sk_buff_head *sk_queue; |
f970bd9e PA |
1214 | int amt; |
1215 | ||
6b229cf7 ED |
1216 | if (likely(partial)) { |
1217 | up->forward_deficit += size; | |
1218 | size = up->forward_deficit; | |
0d4a6608 | 1219 | if (size < (sk->sk_rcvbuf >> 2)) |
6b229cf7 ED |
1220 | return; |
1221 | } else { | |
1222 | size += up->forward_deficit; | |
1223 | } | |
1224 | up->forward_deficit = 0; | |
1225 | ||
6dfb4367 PA |
1226 | /* acquire the sk_receive_queue for fwd allocated memory scheduling, |
1227 | * if the called don't held it already | |
1228 | */ | |
2276f58a | 1229 | sk_queue = &sk->sk_receive_queue; |
6dfb4367 PA |
1230 | if (!rx_queue_lock_held) |
1231 | spin_lock(&sk_queue->lock); | |
1232 | ||
2276f58a | 1233 | |
f970bd9e PA |
1234 | sk->sk_forward_alloc += size; |
1235 | amt = (sk->sk_forward_alloc - partial) & ~(SK_MEM_QUANTUM - 1); | |
1236 | sk->sk_forward_alloc -= amt; | |
f970bd9e PA |
1237 | |
1238 | if (amt) | |
1239 | __sk_mem_reduce_allocated(sk, amt >> SK_MEM_QUANTUM_SHIFT); | |
02ab0d13 ED |
1240 | |
1241 | atomic_sub(size, &sk->sk_rmem_alloc); | |
2276f58a PA |
1242 | |
1243 | /* this can save us from acquiring the rx queue lock on next receive */ | |
1244 | skb_queue_splice_tail_init(sk_queue, &up->reader_queue); | |
1245 | ||
6dfb4367 PA |
1246 | if (!rx_queue_lock_held) |
1247 | spin_unlock(&sk_queue->lock); | |
f970bd9e PA |
1248 | } |
1249 | ||
2276f58a | 1250 | /* Note: called with reader_queue.lock held. |
c84d9490 ED |
1251 | * Instead of using skb->truesize here, find a copy of it in skb->dev_scratch |
1252 | * This avoids a cache line miss while receive_queue lock is held. | |
1253 | * Look at __udp_enqueue_schedule_skb() to find where this copy is done. | |
1254 | */ | |
7c13f97f | 1255 | void udp_skb_destructor(struct sock *sk, struct sk_buff *skb) |
f970bd9e | 1256 | { |
b65ac446 PA |
1257 | prefetch(&skb->data); |
1258 | udp_rmem_release(sk, udp_skb_truesize(skb), 1, false); | |
f970bd9e | 1259 | } |
7c13f97f | 1260 | EXPORT_SYMBOL(udp_skb_destructor); |
f970bd9e | 1261 | |
6dfb4367 | 1262 | /* as above, but the caller held the rx queue lock, too */ |
64f5102d | 1263 | static void udp_skb_dtor_locked(struct sock *sk, struct sk_buff *skb) |
6dfb4367 | 1264 | { |
b65ac446 PA |
1265 | prefetch(&skb->data); |
1266 | udp_rmem_release(sk, udp_skb_truesize(skb), 1, true); | |
6dfb4367 PA |
1267 | } |
1268 | ||
4b272750 ED |
1269 | /* Idea of busylocks is to let producers grab an extra spinlock |
1270 | * to relieve pressure on the receive_queue spinlock shared by consumer. | |
1271 | * Under flood, this means that only one producer can be in line | |
1272 | * trying to acquire the receive_queue spinlock. | |
1273 | * These busylock can be allocated on a per cpu manner, instead of a | |
1274 | * per socket one (that would consume a cache line per socket) | |
1275 | */ | |
1276 | static int udp_busylocks_log __read_mostly; | |
1277 | static spinlock_t *udp_busylocks __read_mostly; | |
1278 | ||
1279 | static spinlock_t *busylock_acquire(void *ptr) | |
1280 | { | |
1281 | spinlock_t *busy; | |
1282 | ||
1283 | busy = udp_busylocks + hash_ptr(ptr, udp_busylocks_log); | |
1284 | spin_lock(busy); | |
1285 | return busy; | |
1286 | } | |
1287 | ||
1288 | static void busylock_release(spinlock_t *busy) | |
1289 | { | |
1290 | if (busy) | |
1291 | spin_unlock(busy); | |
1292 | } | |
1293 | ||
f970bd9e PA |
1294 | int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb) |
1295 | { | |
1296 | struct sk_buff_head *list = &sk->sk_receive_queue; | |
1297 | int rmem, delta, amt, err = -ENOMEM; | |
4b272750 | 1298 | spinlock_t *busy = NULL; |
c8c8b127 | 1299 | int size; |
f970bd9e PA |
1300 | |
1301 | /* try to avoid the costly atomic add/sub pair when the receive | |
1302 | * queue is full; always allow at least a packet | |
1303 | */ | |
1304 | rmem = atomic_read(&sk->sk_rmem_alloc); | |
363dc73a | 1305 | if (rmem > sk->sk_rcvbuf) |
f970bd9e PA |
1306 | goto drop; |
1307 | ||
c8c8b127 ED |
1308 | /* Under mem pressure, it might be helpful to help udp_recvmsg() |
1309 | * having linear skbs : | |
1310 | * - Reduce memory overhead and thus increase receive queue capacity | |
1311 | * - Less cache line misses at copyout() time | |
1312 | * - Less work at consume_skb() (less alien page frag freeing) | |
1313 | */ | |
4b272750 | 1314 | if (rmem > (sk->sk_rcvbuf >> 1)) { |
c8c8b127 | 1315 | skb_condense(skb); |
4b272750 ED |
1316 | |
1317 | busy = busylock_acquire(sk); | |
1318 | } | |
c8c8b127 | 1319 | size = skb->truesize; |
b65ac446 | 1320 | udp_set_dev_scratch(skb); |
c8c8b127 | 1321 | |
f970bd9e PA |
1322 | /* we drop only if the receive buf is full and the receive |
1323 | * queue contains some other skb | |
1324 | */ | |
1325 | rmem = atomic_add_return(size, &sk->sk_rmem_alloc); | |
363dc73a | 1326 | if (rmem > (size + sk->sk_rcvbuf)) |
f970bd9e PA |
1327 | goto uncharge_drop; |
1328 | ||
1329 | spin_lock(&list->lock); | |
1330 | if (size >= sk->sk_forward_alloc) { | |
1331 | amt = sk_mem_pages(size); | |
1332 | delta = amt << SK_MEM_QUANTUM_SHIFT; | |
1333 | if (!__sk_mem_raise_allocated(sk, delta, amt, SK_MEM_RECV)) { | |
1334 | err = -ENOBUFS; | |
1335 | spin_unlock(&list->lock); | |
1336 | goto uncharge_drop; | |
1337 | } | |
1338 | ||
1339 | sk->sk_forward_alloc += delta; | |
1340 | } | |
1341 | ||
1342 | sk->sk_forward_alloc -= size; | |
1343 | ||
7c13f97f PA |
1344 | /* no need to setup a destructor, we will explicitly release the |
1345 | * forward allocated memory on dequeue | |
1346 | */ | |
f970bd9e PA |
1347 | sock_skb_set_dropcount(sk, skb); |
1348 | ||
1349 | __skb_queue_tail(list, skb); | |
1350 | spin_unlock(&list->lock); | |
1351 | ||
1352 | if (!sock_flag(sk, SOCK_DEAD)) | |
1353 | sk->sk_data_ready(sk); | |
1354 | ||
4b272750 | 1355 | busylock_release(busy); |
f970bd9e PA |
1356 | return 0; |
1357 | ||
1358 | uncharge_drop: | |
1359 | atomic_sub(skb->truesize, &sk->sk_rmem_alloc); | |
1360 | ||
1361 | drop: | |
1362 | atomic_inc(&sk->sk_drops); | |
4b272750 | 1363 | busylock_release(busy); |
f970bd9e PA |
1364 | return err; |
1365 | } | |
1366 | EXPORT_SYMBOL_GPL(__udp_enqueue_schedule_skb); | |
1367 | ||
c915fe13 | 1368 | void udp_destruct_sock(struct sock *sk) |
f970bd9e PA |
1369 | { |
1370 | /* reclaim completely the forward allocated memory */ | |
2276f58a | 1371 | struct udp_sock *up = udp_sk(sk); |
7c13f97f PA |
1372 | unsigned int total = 0; |
1373 | struct sk_buff *skb; | |
1374 | ||
2276f58a PA |
1375 | skb_queue_splice_tail_init(&sk->sk_receive_queue, &up->reader_queue); |
1376 | while ((skb = __skb_dequeue(&up->reader_queue)) != NULL) { | |
7c13f97f PA |
1377 | total += skb->truesize; |
1378 | kfree_skb(skb); | |
1379 | } | |
6dfb4367 | 1380 | udp_rmem_release(sk, total, 0, true); |
7c13f97f | 1381 | |
f970bd9e PA |
1382 | inet_sock_destruct(sk); |
1383 | } | |
c915fe13 | 1384 | EXPORT_SYMBOL_GPL(udp_destruct_sock); |
f970bd9e PA |
1385 | |
1386 | int udp_init_sock(struct sock *sk) | |
1387 | { | |
2276f58a | 1388 | skb_queue_head_init(&udp_sk(sk)->reader_queue); |
f970bd9e PA |
1389 | sk->sk_destruct = udp_destruct_sock; |
1390 | return 0; | |
1391 | } | |
1392 | EXPORT_SYMBOL_GPL(udp_init_sock); | |
1393 | ||
1394 | void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len) | |
1395 | { | |
1396 | if (unlikely(READ_ONCE(sk->sk_peek_off) >= 0)) { | |
1397 | bool slow = lock_sock_fast(sk); | |
1398 | ||
1399 | sk_peek_offset_bwd(sk, len); | |
1400 | unlock_sock_fast(sk, slow); | |
1401 | } | |
0a463c78 | 1402 | |
ca2c1418 PA |
1403 | if (!skb_unref(skb)) |
1404 | return; | |
1405 | ||
dce4551c PA |
1406 | /* In the more common cases we cleared the head states previously, |
1407 | * see __udp_queue_rcv_skb(). | |
0ddf3fb2 | 1408 | */ |
dce4551c | 1409 | if (unlikely(udp_skb_has_head_state(skb))) |
0ddf3fb2 | 1410 | skb_release_head_state(skb); |
ca2c1418 | 1411 | __consume_stateless_skb(skb); |
f970bd9e PA |
1412 | } |
1413 | EXPORT_SYMBOL_GPL(skb_consume_udp); | |
1414 | ||
2276f58a PA |
1415 | static struct sk_buff *__first_packet_length(struct sock *sk, |
1416 | struct sk_buff_head *rcvq, | |
1417 | int *total) | |
1418 | { | |
1419 | struct sk_buff *skb; | |
1420 | ||
9bd780f5 PA |
1421 | while ((skb = skb_peek(rcvq)) != NULL) { |
1422 | if (udp_lib_checksum_complete(skb)) { | |
1423 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, | |
1424 | IS_UDPLITE(sk)); | |
1425 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, | |
1426 | IS_UDPLITE(sk)); | |
1427 | atomic_inc(&sk->sk_drops); | |
1428 | __skb_unlink(skb, rcvq); | |
1429 | *total += skb->truesize; | |
1430 | kfree_skb(skb); | |
1431 | } else { | |
1432 | /* the csum related bits could be changed, refresh | |
1433 | * the scratch area | |
1434 | */ | |
1435 | udp_set_dev_scratch(skb); | |
1436 | break; | |
1437 | } | |
2276f58a PA |
1438 | } |
1439 | return skb; | |
1440 | } | |
1441 | ||
85584672 ED |
1442 | /** |
1443 | * first_packet_length - return length of first packet in receive queue | |
1444 | * @sk: socket | |
1445 | * | |
1446 | * Drops all bad checksum frames, until a valid one is found. | |
e83c6744 | 1447 | * Returns the length of found skb, or -1 if none is found. |
85584672 | 1448 | */ |
e83c6744 | 1449 | static int first_packet_length(struct sock *sk) |
85584672 | 1450 | { |
2276f58a PA |
1451 | struct sk_buff_head *rcvq = &udp_sk(sk)->reader_queue; |
1452 | struct sk_buff_head *sk_queue = &sk->sk_receive_queue; | |
85584672 | 1453 | struct sk_buff *skb; |
7c13f97f | 1454 | int total = 0; |
e83c6744 | 1455 | int res; |
85584672 | 1456 | |
85584672 | 1457 | spin_lock_bh(&rcvq->lock); |
2276f58a PA |
1458 | skb = __first_packet_length(sk, rcvq, &total); |
1459 | if (!skb && !skb_queue_empty(sk_queue)) { | |
1460 | spin_lock(&sk_queue->lock); | |
1461 | skb_queue_splice_tail_init(sk_queue, rcvq); | |
1462 | spin_unlock(&sk_queue->lock); | |
1463 | ||
1464 | skb = __first_packet_length(sk, rcvq, &total); | |
85584672 | 1465 | } |
e83c6744 | 1466 | res = skb ? skb->len : -1; |
7c13f97f | 1467 | if (total) |
6dfb4367 | 1468 | udp_rmem_release(sk, total, 1, false); |
85584672 | 1469 | spin_unlock_bh(&rcvq->lock); |
85584672 ED |
1470 | return res; |
1471 | } | |
1472 | ||
1da177e4 LT |
1473 | /* |
1474 | * IOCTL requests applicable to the UDP protocol | |
1475 | */ | |
e905a9ed | 1476 | |
1da177e4 LT |
1477 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1478 | { | |
6516c655 SH |
1479 | switch (cmd) { |
1480 | case SIOCOUTQ: | |
1da177e4 | 1481 | { |
31e6d363 ED |
1482 | int amount = sk_wmem_alloc_get(sk); |
1483 | ||
6516c655 SH |
1484 | return put_user(amount, (int __user *)arg); |
1485 | } | |
1da177e4 | 1486 | |
6516c655 SH |
1487 | case SIOCINQ: |
1488 | { | |
e83c6744 | 1489 | int amount = max_t(int, 0, first_packet_length(sk)); |
6516c655 | 1490 | |
6516c655 SH |
1491 | return put_user(amount, (int __user *)arg); |
1492 | } | |
1da177e4 | 1493 | |
6516c655 SH |
1494 | default: |
1495 | return -ENOIOCTLCMD; | |
1da177e4 | 1496 | } |
6516c655 SH |
1497 | |
1498 | return 0; | |
1da177e4 | 1499 | } |
c482c568 | 1500 | EXPORT_SYMBOL(udp_ioctl); |
1da177e4 | 1501 | |
2276f58a PA |
1502 | struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags, |
1503 | int noblock, int *peeked, int *off, int *err) | |
1504 | { | |
1505 | struct sk_buff_head *sk_queue = &sk->sk_receive_queue; | |
1506 | struct sk_buff_head *queue; | |
1507 | struct sk_buff *last; | |
1508 | long timeo; | |
1509 | int error; | |
1510 | ||
1511 | queue = &udp_sk(sk)->reader_queue; | |
1512 | flags |= noblock ? MSG_DONTWAIT : 0; | |
1513 | timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT); | |
1514 | do { | |
1515 | struct sk_buff *skb; | |
1516 | ||
1517 | error = sock_error(sk); | |
1518 | if (error) | |
1519 | break; | |
1520 | ||
1521 | error = -EAGAIN; | |
1522 | *peeked = 0; | |
1523 | do { | |
2276f58a PA |
1524 | spin_lock_bh(&queue->lock); |
1525 | skb = __skb_try_recv_from_queue(sk, queue, flags, | |
1526 | udp_skb_destructor, | |
de321ed3 | 1527 | peeked, off, err, |
2276f58a PA |
1528 | &last); |
1529 | if (skb) { | |
1530 | spin_unlock_bh(&queue->lock); | |
2276f58a PA |
1531 | return skb; |
1532 | } | |
1533 | ||
1534 | if (skb_queue_empty(sk_queue)) { | |
1535 | spin_unlock_bh(&queue->lock); | |
1536 | goto busy_check; | |
1537 | } | |
1538 | ||
6dfb4367 PA |
1539 | /* refill the reader queue and walk it again |
1540 | * keep both queues locked to avoid re-acquiring | |
1541 | * the sk_receive_queue lock if fwd memory scheduling | |
1542 | * is needed. | |
1543 | */ | |
2276f58a PA |
1544 | spin_lock(&sk_queue->lock); |
1545 | skb_queue_splice_tail_init(sk_queue, queue); | |
2276f58a PA |
1546 | |
1547 | skb = __skb_try_recv_from_queue(sk, queue, flags, | |
6dfb4367 | 1548 | udp_skb_dtor_locked, |
de321ed3 | 1549 | peeked, off, err, |
2276f58a | 1550 | &last); |
6dfb4367 | 1551 | spin_unlock(&sk_queue->lock); |
2276f58a | 1552 | spin_unlock_bh(&queue->lock); |
de321ed3 | 1553 | if (skb) |
2276f58a | 1554 | return skb; |
2276f58a PA |
1555 | |
1556 | busy_check: | |
1557 | if (!sk_can_busy_loop(sk)) | |
1558 | break; | |
1559 | ||
1560 | sk_busy_loop(sk, flags & MSG_DONTWAIT); | |
1561 | } while (!skb_queue_empty(sk_queue)); | |
1562 | ||
1563 | /* sk_queue is empty, reader_queue may contain peeked packets */ | |
1564 | } while (timeo && | |
1565 | !__skb_wait_for_more_packets(sk, &error, &timeo, | |
1566 | (struct sk_buff *)sk_queue)); | |
1567 | ||
1568 | *err = error; | |
1569 | return NULL; | |
1570 | } | |
23660274 | 1571 | EXPORT_SYMBOL(__skb_recv_udp); |
2276f58a | 1572 | |
db8dac20 DM |
1573 | /* |
1574 | * This should be easy, if there is something there we | |
1575 | * return it, otherwise we block. | |
1576 | */ | |
1577 | ||
1b784140 YX |
1578 | int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock, |
1579 | int flags, int *addr_len) | |
db8dac20 DM |
1580 | { |
1581 | struct inet_sock *inet = inet_sk(sk); | |
342dfc30 | 1582 | DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name); |
db8dac20 | 1583 | struct sk_buff *skb; |
59c2cdae | 1584 | unsigned int ulen, copied; |
627d2d6b | 1585 | int peeked, peeking, off; |
db8dac20 DM |
1586 | int err; |
1587 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 1588 | bool checksum_valid = false; |
db8dac20 | 1589 | |
db8dac20 | 1590 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 1591 | return ip_recv_error(sk, msg, len, addr_len); |
db8dac20 DM |
1592 | |
1593 | try_again: | |
a0917e0b MD |
1594 | peeking = flags & MSG_PEEK; |
1595 | off = sk_peek_offset(sk, flags); | |
7c13f97f | 1596 | skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err); |
db8dac20 | 1597 | if (!skb) |
627d2d6b | 1598 | return err; |
db8dac20 | 1599 | |
b65ac446 | 1600 | ulen = udp_skb_len(skb); |
59c2cdae | 1601 | copied = len; |
627d2d6b | 1602 | if (copied > ulen - off) |
1603 | copied = ulen - off; | |
59c2cdae | 1604 | else if (copied < ulen) |
db8dac20 DM |
1605 | msg->msg_flags |= MSG_TRUNC; |
1606 | ||
1607 | /* | |
1608 | * If checksum is needed at all, try to do it while copying the | |
1609 | * data. If the data is truncated, or if we only want a partial | |
1610 | * coverage checksum (UDP-Lite), do it before the copy. | |
1611 | */ | |
1612 | ||
d21dbdfe ED |
1613 | if (copied < ulen || peeking || |
1614 | (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { | |
b65ac446 PA |
1615 | checksum_valid = udp_skb_csum_unnecessary(skb) || |
1616 | !__udp_lib_checksum_complete(skb); | |
197c949e | 1617 | if (!checksum_valid) |
db8dac20 DM |
1618 | goto csum_copy_err; |
1619 | } | |
1620 | ||
b65ac446 PA |
1621 | if (checksum_valid || udp_skb_csum_unnecessary(skb)) { |
1622 | if (udp_skb_is_linear(skb)) | |
1623 | err = copy_linear_skb(skb, copied, off, &msg->msg_iter); | |
1624 | else | |
1625 | err = skb_copy_datagram_msg(skb, off, msg, copied); | |
1626 | } else { | |
627d2d6b | 1627 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
db8dac20 DM |
1628 | |
1629 | if (err == -EINVAL) | |
1630 | goto csum_copy_err; | |
1631 | } | |
1632 | ||
22911fc5 | 1633 | if (unlikely(err)) { |
979402b1 ED |
1634 | if (!peeked) { |
1635 | atomic_inc(&sk->sk_drops); | |
6aef70a8 ED |
1636 | UDP_INC_STATS(sock_net(sk), |
1637 | UDP_MIB_INERRORS, is_udplite); | |
979402b1 | 1638 | } |
850cbadd | 1639 | kfree_skb(skb); |
627d2d6b | 1640 | return err; |
22911fc5 | 1641 | } |
db8dac20 DM |
1642 | |
1643 | if (!peeked) | |
6aef70a8 ED |
1644 | UDP_INC_STATS(sock_net(sk), |
1645 | UDP_MIB_INDATAGRAMS, is_udplite); | |
db8dac20 | 1646 | |
3b885787 | 1647 | sock_recv_ts_and_drops(msg, sk, skb); |
db8dac20 DM |
1648 | |
1649 | /* Copy the address. */ | |
c482c568 | 1650 | if (sin) { |
db8dac20 DM |
1651 | sin->sin_family = AF_INET; |
1652 | sin->sin_port = udp_hdr(skb)->source; | |
1653 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
1654 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
bceaa902 | 1655 | *addr_len = sizeof(*sin); |
db8dac20 DM |
1656 | } |
1657 | if (inet->cmsg_flags) | |
ad959036 | 1658 | ip_cmsg_recv_offset(msg, sk, skb, sizeof(struct udphdr), off); |
db8dac20 | 1659 | |
59c2cdae | 1660 | err = copied; |
db8dac20 DM |
1661 | if (flags & MSG_TRUNC) |
1662 | err = ulen; | |
1663 | ||
850cbadd | 1664 | skb_consume_udp(sk, skb, peeking ? -err : err); |
db8dac20 DM |
1665 | return err; |
1666 | ||
1667 | csum_copy_err: | |
2276f58a PA |
1668 | if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, |
1669 | udp_skb_destructor)) { | |
6aef70a8 ED |
1670 | UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
1671 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 1672 | } |
850cbadd | 1673 | kfree_skb(skb); |
db8dac20 | 1674 | |
beb39db5 ED |
1675 | /* starting over for a new packet, but check if we need to yield */ |
1676 | cond_resched(); | |
9cfaa8de | 1677 | msg->msg_flags &= ~MSG_TRUNC; |
db8dac20 DM |
1678 | goto try_again; |
1679 | } | |
1680 | ||
286c72de | 1681 | int __udp_disconnect(struct sock *sk, int flags) |
1da177e4 LT |
1682 | { |
1683 | struct inet_sock *inet = inet_sk(sk); | |
1684 | /* | |
1685 | * 1003.1g - break association. | |
1686 | */ | |
e905a9ed | 1687 | |
1da177e4 | 1688 | sk->sk_state = TCP_CLOSE; |
c720c7e8 ED |
1689 | inet->inet_daddr = 0; |
1690 | inet->inet_dport = 0; | |
bdeab991 | 1691 | sock_rps_reset_rxhash(sk); |
1da177e4 LT |
1692 | sk->sk_bound_dev_if = 0; |
1693 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
1694 | inet_reset_saddr(sk); | |
1695 | ||
1696 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { | |
1697 | sk->sk_prot->unhash(sk); | |
c720c7e8 | 1698 | inet->inet_sport = 0; |
1da177e4 LT |
1699 | } |
1700 | sk_dst_reset(sk); | |
1701 | return 0; | |
1702 | } | |
286c72de ED |
1703 | EXPORT_SYMBOL(__udp_disconnect); |
1704 | ||
1705 | int udp_disconnect(struct sock *sk, int flags) | |
1706 | { | |
1707 | lock_sock(sk); | |
1708 | __udp_disconnect(sk, flags); | |
1709 | release_sock(sk); | |
1710 | return 0; | |
1711 | } | |
c482c568 | 1712 | EXPORT_SYMBOL(udp_disconnect); |
1da177e4 | 1713 | |
645ca708 ED |
1714 | void udp_lib_unhash(struct sock *sk) |
1715 | { | |
723b4610 ED |
1716 | if (sk_hashed(sk)) { |
1717 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
512615b6 ED |
1718 | struct udp_hslot *hslot, *hslot2; |
1719 | ||
1720 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1721 | udp_sk(sk)->udp_port_hash); | |
1722 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
645ca708 | 1723 | |
723b4610 | 1724 | spin_lock_bh(&hslot->lock); |
e32ea7e7 CG |
1725 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1726 | reuseport_detach_sock(sk); | |
ca065d0c | 1727 | if (sk_del_node_init_rcu(sk)) { |
fdcc8aa9 | 1728 | hslot->count--; |
c720c7e8 | 1729 | inet_sk(sk)->inet_num = 0; |
723b4610 | 1730 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
512615b6 ED |
1731 | |
1732 | spin_lock(&hslot2->lock); | |
ca065d0c | 1733 | hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
512615b6 ED |
1734 | hslot2->count--; |
1735 | spin_unlock(&hslot2->lock); | |
723b4610 ED |
1736 | } |
1737 | spin_unlock_bh(&hslot->lock); | |
645ca708 | 1738 | } |
645ca708 ED |
1739 | } |
1740 | EXPORT_SYMBOL(udp_lib_unhash); | |
1741 | ||
719f8358 ED |
1742 | /* |
1743 | * inet_rcv_saddr was changed, we must rehash secondary hash | |
1744 | */ | |
1745 | void udp_lib_rehash(struct sock *sk, u16 newhash) | |
1746 | { | |
1747 | if (sk_hashed(sk)) { | |
1748 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
1749 | struct udp_hslot *hslot, *hslot2, *nhslot2; | |
1750 | ||
1751 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
1752 | nhslot2 = udp_hashslot2(udptable, newhash); | |
1753 | udp_sk(sk)->udp_portaddr_hash = newhash; | |
e32ea7e7 CG |
1754 | |
1755 | if (hslot2 != nhslot2 || | |
1756 | rcu_access_pointer(sk->sk_reuseport_cb)) { | |
719f8358 ED |
1757 | hslot = udp_hashslot(udptable, sock_net(sk), |
1758 | udp_sk(sk)->udp_port_hash); | |
1759 | /* we must lock primary chain too */ | |
1760 | spin_lock_bh(&hslot->lock); | |
e32ea7e7 CG |
1761 | if (rcu_access_pointer(sk->sk_reuseport_cb)) |
1762 | reuseport_detach_sock(sk); | |
1763 | ||
1764 | if (hslot2 != nhslot2) { | |
1765 | spin_lock(&hslot2->lock); | |
ca065d0c | 1766 | hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); |
e32ea7e7 CG |
1767 | hslot2->count--; |
1768 | spin_unlock(&hslot2->lock); | |
1769 | ||
1770 | spin_lock(&nhslot2->lock); | |
ca065d0c | 1771 | hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, |
e32ea7e7 CG |
1772 | &nhslot2->head); |
1773 | nhslot2->count++; | |
1774 | spin_unlock(&nhslot2->lock); | |
1775 | } | |
719f8358 ED |
1776 | |
1777 | spin_unlock_bh(&hslot->lock); | |
1778 | } | |
1779 | } | |
1780 | } | |
1781 | EXPORT_SYMBOL(udp_lib_rehash); | |
1782 | ||
1783 | static void udp_v4_rehash(struct sock *sk) | |
1784 | { | |
1785 | u16 new_hash = udp4_portaddr_hash(sock_net(sk), | |
1786 | inet_sk(sk)->inet_rcv_saddr, | |
1787 | inet_sk(sk)->inet_num); | |
1788 | udp_lib_rehash(sk, new_hash); | |
1789 | } | |
1790 | ||
a3f96c47 | 1791 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
93821778 | 1792 | { |
fec5e652 | 1793 | int rc; |
766e9037 | 1794 | |
005ec974 | 1795 | if (inet_sk(sk)->inet_daddr) { |
bdeab991 | 1796 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 1797 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 1798 | sk_incoming_cpu_update(sk); |
e68b6e50 ED |
1799 | } else { |
1800 | sk_mark_napi_id_once(sk, skb); | |
005ec974 | 1801 | } |
fec5e652 | 1802 | |
850cbadd | 1803 | rc = __udp_enqueue_schedule_skb(sk, skb); |
766e9037 ED |
1804 | if (rc < 0) { |
1805 | int is_udplite = IS_UDPLITE(sk); | |
93821778 | 1806 | |
93821778 | 1807 | /* Note that an ENOMEM error is charged twice */ |
766e9037 | 1808 | if (rc == -ENOMEM) |
e61da9e2 | 1809 | UDP_INC_STATS(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
02c22347 | 1810 | is_udplite); |
e61da9e2 | 1811 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
766e9037 | 1812 | kfree_skb(skb); |
296f7ea7 | 1813 | trace_udp_fail_queue_rcv_skb(rc, sk); |
766e9037 | 1814 | return -1; |
93821778 HX |
1815 | } |
1816 | ||
1817 | return 0; | |
93821778 HX |
1818 | } |
1819 | ||
447167bf ED |
1820 | static struct static_key udp_encap_needed __read_mostly; |
1821 | void udp_encap_enable(void) | |
1822 | { | |
7a34bcb8 | 1823 | static_key_enable(&udp_encap_needed); |
447167bf ED |
1824 | } |
1825 | EXPORT_SYMBOL(udp_encap_enable); | |
1826 | ||
db8dac20 DM |
1827 | /* returns: |
1828 | * -1: error | |
1829 | * 0: success | |
1830 | * >0: "udp encap" protocol resubmission | |
1831 | * | |
1832 | * Note that in the success and error cases, the skb is assumed to | |
1833 | * have either been requeued or freed. | |
1834 | */ | |
a3f96c47 | 1835 | static int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
db8dac20 DM |
1836 | { |
1837 | struct udp_sock *up = udp_sk(sk); | |
db8dac20 DM |
1838 | int is_udplite = IS_UDPLITE(sk); |
1839 | ||
1840 | /* | |
1841 | * Charge it to the socket, dropping if the queue is full. | |
1842 | */ | |
1843 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1844 | goto drop; | |
1845 | nf_reset(skb); | |
1846 | ||
447167bf | 1847 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
0ad92ad0 ED |
1848 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
1849 | ||
db8dac20 DM |
1850 | /* |
1851 | * This is an encapsulation socket so pass the skb to | |
1852 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
1853 | * fall through and pass this up the UDP socket. | |
1854 | * up->encap_rcv() returns the following value: | |
1855 | * =0 if skb was successfully passed to the encap | |
1856 | * handler or was discarded by it. | |
1857 | * >0 if skb should be passed on to UDP. | |
1858 | * <0 if skb should be resubmitted as proto -N | |
1859 | */ | |
1860 | ||
1861 | /* if we're overly short, let UDP handle it */ | |
6aa7de05 | 1862 | encap_rcv = READ_ONCE(up->encap_rcv); |
e5aed006 | 1863 | if (encap_rcv) { |
db8dac20 DM |
1864 | int ret; |
1865 | ||
0a80966b TH |
1866 | /* Verify checksum before giving to encap */ |
1867 | if (udp_lib_checksum_complete(skb)) | |
1868 | goto csum_error; | |
1869 | ||
0ad92ad0 | 1870 | ret = encap_rcv(sk, skb); |
db8dac20 | 1871 | if (ret <= 0) { |
02c22347 ED |
1872 | __UDP_INC_STATS(sock_net(sk), |
1873 | UDP_MIB_INDATAGRAMS, | |
1874 | is_udplite); | |
db8dac20 DM |
1875 | return -ret; |
1876 | } | |
1877 | } | |
1878 | ||
1879 | /* FALLTHROUGH -- it's a UDP Packet */ | |
1880 | } | |
1881 | ||
1882 | /* | |
1883 | * UDP-Lite specific tests, ignored on UDP sockets | |
1884 | */ | |
1885 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { | |
1886 | ||
1887 | /* | |
1888 | * MIB statistics other than incrementing the error count are | |
1889 | * disabled for the following two types of errors: these depend | |
1890 | * on the application settings, not on the functioning of the | |
1891 | * protocol stack as such. | |
1892 | * | |
1893 | * RFC 3828 here recommends (sec 3.3): "There should also be a | |
1894 | * way ... to ... at least let the receiving application block | |
1895 | * delivery of packets with coverage values less than a value | |
1896 | * provided by the application." | |
1897 | */ | |
1898 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
1899 | net_dbg_ratelimited("UDPLite: partial coverage %d while full coverage %d requested\n", |
1900 | UDP_SKB_CB(skb)->cscov, skb->len); | |
db8dac20 DM |
1901 | goto drop; |
1902 | } | |
1903 | /* The next case involves violating the min. coverage requested | |
1904 | * by the receiver. This is subtle: if receiver wants x and x is | |
1905 | * greater than the buffersize/MTU then receiver will complain | |
1906 | * that it wants x while sender emits packets of smaller size y. | |
1907 | * Therefore the above ...()->partial_cov statement is essential. | |
1908 | */ | |
1909 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
1910 | net_dbg_ratelimited("UDPLite: coverage %d too small, need min %d\n", |
1911 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
db8dac20 DM |
1912 | goto drop; |
1913 | } | |
1914 | } | |
1915 | ||
dd99e425 | 1916 | prefetch(&sk->sk_rmem_alloc); |
ce25d66a ED |
1917 | if (rcu_access_pointer(sk->sk_filter) && |
1918 | udp_lib_checksum_complete(skb)) | |
e6afc8ac | 1919 | goto csum_error; |
ce25d66a | 1920 | |
ba66bbe5 | 1921 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) |
a6127697 | 1922 | goto drop; |
db8dac20 | 1923 | |
e6afc8ac | 1924 | udp_csum_pull_header(skb); |
db8dac20 | 1925 | |
fbf8866d | 1926 | ipv4_pktinfo_prepare(sk, skb); |
850cbadd | 1927 | return __udp_queue_rcv_skb(sk, skb); |
db8dac20 | 1928 | |
6a5dc9e5 | 1929 | csum_error: |
02c22347 | 1930 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
db8dac20 | 1931 | drop: |
02c22347 | 1932 | __UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
8edf19c2 | 1933 | atomic_inc(&sk->sk_drops); |
db8dac20 DM |
1934 | kfree_skb(skb); |
1935 | return -1; | |
1936 | } | |
1937 | ||
97502231 | 1938 | /* For TCP sockets, sk_rx_dst is protected by socket lock |
e47eb5df | 1939 | * For UDP, we use xchg() to guard against concurrent changes. |
97502231 | 1940 | */ |
64f0f5d1 | 1941 | bool udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) |
421b3885 | 1942 | { |
97502231 ED |
1943 | struct dst_entry *old; |
1944 | ||
d24406c8 WW |
1945 | if (dst_hold_safe(dst)) { |
1946 | old = xchg(&sk->sk_rx_dst, dst); | |
1947 | dst_release(old); | |
64f0f5d1 | 1948 | return old != dst; |
d24406c8 | 1949 | } |
64f0f5d1 | 1950 | return false; |
421b3885 | 1951 | } |
c9f2c1ae | 1952 | EXPORT_SYMBOL(udp_sk_rx_dst_set); |
421b3885 | 1953 | |
db8dac20 DM |
1954 | /* |
1955 | * Multicasts and broadcasts go to each listener. | |
1956 | * | |
1240d137 | 1957 | * Note: called only from the BH handler context. |
db8dac20 | 1958 | */ |
e3163493 | 1959 | static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
db8dac20 DM |
1960 | struct udphdr *uh, |
1961 | __be32 saddr, __be32 daddr, | |
36cbb245 RJ |
1962 | struct udp_table *udptable, |
1963 | int proto) | |
db8dac20 | 1964 | { |
ca065d0c | 1965 | struct sock *sk, *first = NULL; |
5cf3d461 DH |
1966 | unsigned short hnum = ntohs(uh->dest); |
1967 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
2dc41cff | 1968 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c ED |
1969 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
1970 | int dif = skb->dev->ifindex; | |
fb74c277 | 1971 | int sdif = inet_sdif(skb); |
ca065d0c ED |
1972 | struct hlist_node *node; |
1973 | struct sk_buff *nskb; | |
2dc41cff DH |
1974 | |
1975 | if (use_hash2) { | |
1976 | hash2_any = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum) & | |
73e2d5e3 PN |
1977 | udptable->mask; |
1978 | hash2 = udp4_portaddr_hash(net, daddr, hnum) & udptable->mask; | |
2dc41cff | 1979 | start_lookup: |
73e2d5e3 | 1980 | hslot = &udptable->hash2[hash2]; |
2dc41cff DH |
1981 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
1982 | } | |
db8dac20 | 1983 | |
ca065d0c ED |
1984 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
1985 | if (!__udp_is_mcast_sock(net, sk, uh->dest, daddr, | |
fb74c277 | 1986 | uh->source, saddr, dif, sdif, hnum)) |
ca065d0c ED |
1987 | continue; |
1988 | ||
1989 | if (!first) { | |
1990 | first = sk; | |
1991 | continue; | |
1240d137 | 1992 | } |
ca065d0c | 1993 | nskb = skb_clone(skb, GFP_ATOMIC); |
1240d137 | 1994 | |
ca065d0c ED |
1995 | if (unlikely(!nskb)) { |
1996 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
1997 | __UDP_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
1998 | IS_UDPLITE(sk)); | |
1999 | __UDP_INC_STATS(net, UDP_MIB_INERRORS, | |
2000 | IS_UDPLITE(sk)); | |
ca065d0c ED |
2001 | continue; |
2002 | } | |
2003 | if (udp_queue_rcv_skb(sk, nskb) > 0) | |
2004 | consume_skb(nskb); | |
2005 | } | |
1240d137 | 2006 | |
2dc41cff DH |
2007 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
2008 | if (use_hash2 && hash2 != hash2_any) { | |
2009 | hash2 = hash2_any; | |
2010 | goto start_lookup; | |
2011 | } | |
2012 | ||
ca065d0c ED |
2013 | if (first) { |
2014 | if (udp_queue_rcv_skb(first, skb) > 0) | |
2015 | consume_skb(skb); | |
1240d137 | 2016 | } else { |
ca065d0c | 2017 | kfree_skb(skb); |
02c22347 ED |
2018 | __UDP_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
2019 | proto == IPPROTO_UDPLITE); | |
1240d137 | 2020 | } |
db8dac20 DM |
2021 | return 0; |
2022 | } | |
2023 | ||
2024 | /* Initialize UDP checksum. If exited with zero value (success), | |
2025 | * CHECKSUM_UNNECESSARY means, that no more checks are required. | |
2026 | * Otherwise, csum completion requires chacksumming packet body, | |
2027 | * including udp header and folding it to skb->csum. | |
2028 | */ | |
2029 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, | |
2030 | int proto) | |
2031 | { | |
db8dac20 DM |
2032 | int err; |
2033 | ||
2034 | UDP_SKB_CB(skb)->partial_cov = 0; | |
2035 | UDP_SKB_CB(skb)->cscov = skb->len; | |
2036 | ||
2037 | if (proto == IPPROTO_UDPLITE) { | |
2038 | err = udplite_checksum_init(skb, uh); | |
2039 | if (err) | |
2040 | return err; | |
21cb125b AK |
2041 | |
2042 | if (UDP_SKB_CB(skb)->partial_cov) { | |
2043 | skb->csum = inet_compute_pseudo(skb, proto); | |
2044 | return 0; | |
2045 | } | |
db8dac20 DM |
2046 | } |
2047 | ||
b46d9f62 HFS |
2048 | /* Note, we are only interested in != 0 or == 0, thus the |
2049 | * force to int. | |
2050 | */ | |
1c30e3a3 ST |
2051 | err = (__force int)skb_checksum_init_zero_check(skb, proto, uh->check, |
2052 | inet_compute_pseudo); | |
2053 | if (err) | |
2054 | return err; | |
2055 | ||
2056 | if (skb->ip_summed == CHECKSUM_COMPLETE && !skb->csum_valid) { | |
2057 | /* If SW calculated the value, we know it's bad */ | |
2058 | if (skb->csum_complete_sw) | |
2059 | return 1; | |
2060 | ||
2061 | /* HW says the value is bad. Let's validate that. | |
2062 | * skb->csum is no longer the full packet checksum, | |
2063 | * so don't treat it as such. | |
2064 | */ | |
2065 | skb_checksum_complete_unset(skb); | |
2066 | } | |
2067 | ||
2068 | return 0; | |
db8dac20 DM |
2069 | } |
2070 | ||
27dcee8f PA |
2071 | /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and |
2072 | * return code conversion for ip layer consumption | |
2073 | */ | |
2074 | static int udp_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, | |
2075 | struct udphdr *uh) | |
2076 | { | |
2077 | int ret; | |
2078 | ||
2079 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) | |
2080 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, | |
2081 | inet_compute_pseudo); | |
2082 | ||
2083 | ret = udp_queue_rcv_skb(sk, skb); | |
2084 | ||
2085 | /* a return value > 0 means to resubmit the input, but | |
2086 | * it wants the return to be -protocol, or 0 | |
2087 | */ | |
2088 | if (ret > 0) | |
2089 | return -ret; | |
2090 | return 0; | |
2091 | } | |
2092 | ||
db8dac20 DM |
2093 | /* |
2094 | * All we need to do is get the socket, and then do a checksum. | |
2095 | */ | |
2096 | ||
645ca708 | 2097 | int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
db8dac20 DM |
2098 | int proto) |
2099 | { | |
2100 | struct sock *sk; | |
7b5e56f9 | 2101 | struct udphdr *uh; |
db8dac20 | 2102 | unsigned short ulen; |
adf30907 | 2103 | struct rtable *rt = skb_rtable(skb); |
2783ef23 | 2104 | __be32 saddr, daddr; |
0283328e | 2105 | struct net *net = dev_net(skb->dev); |
db8dac20 DM |
2106 | |
2107 | /* | |
2108 | * Validate the packet. | |
2109 | */ | |
2110 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
2111 | goto drop; /* No space for header. */ | |
2112 | ||
7b5e56f9 | 2113 | uh = udp_hdr(skb); |
db8dac20 | 2114 | ulen = ntohs(uh->len); |
ccc2d97c BM |
2115 | saddr = ip_hdr(skb)->saddr; |
2116 | daddr = ip_hdr(skb)->daddr; | |
2117 | ||
db8dac20 DM |
2118 | if (ulen > skb->len) |
2119 | goto short_packet; | |
2120 | ||
2121 | if (proto == IPPROTO_UDP) { | |
2122 | /* UDP validates ulen. */ | |
2123 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) | |
2124 | goto short_packet; | |
2125 | uh = udp_hdr(skb); | |
2126 | } | |
2127 | ||
2128 | if (udp4_csum_init(skb, uh, proto)) | |
2129 | goto csum_error; | |
2130 | ||
8afdd99a ED |
2131 | sk = skb_steal_sock(skb); |
2132 | if (sk) { | |
97502231 | 2133 | struct dst_entry *dst = skb_dst(skb); |
421b3885 | 2134 | int ret; |
421b3885 | 2135 | |
97502231 ED |
2136 | if (unlikely(sk->sk_rx_dst != dst)) |
2137 | udp_sk_rx_dst_set(sk, dst); | |
db8dac20 | 2138 | |
27dcee8f | 2139 | ret = udp_unicast_rcv_skb(sk, skb, uh); |
8afdd99a | 2140 | sock_put(sk); |
27dcee8f | 2141 | return ret; |
421b3885 | 2142 | } |
db8dac20 | 2143 | |
c18450a5 FF |
2144 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
2145 | return __udp4_lib_mcast_deliver(net, skb, uh, | |
36cbb245 | 2146 | saddr, daddr, udptable, proto); |
c18450a5 FF |
2147 | |
2148 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); | |
27dcee8f PA |
2149 | if (sk) |
2150 | return udp_unicast_rcv_skb(sk, skb, uh); | |
db8dac20 DM |
2151 | |
2152 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
2153 | goto drop; | |
2154 | nf_reset(skb); | |
2155 | ||
2156 | /* No socket. Drop packet silently, if checksum is wrong */ | |
2157 | if (udp_lib_checksum_complete(skb)) | |
2158 | goto csum_error; | |
2159 | ||
02c22347 | 2160 | __UDP_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
2161 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
2162 | ||
2163 | /* | |
2164 | * Hmm. We got an UDP packet to a port to which we | |
2165 | * don't wanna listen. Ignore it. | |
2166 | */ | |
2167 | kfree_skb(skb); | |
2168 | return 0; | |
2169 | ||
2170 | short_packet: | |
ba7a46f1 JP |
2171 | net_dbg_ratelimited("UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
2172 | proto == IPPROTO_UDPLITE ? "Lite" : "", | |
2173 | &saddr, ntohs(uh->source), | |
2174 | ulen, skb->len, | |
2175 | &daddr, ntohs(uh->dest)); | |
db8dac20 DM |
2176 | goto drop; |
2177 | ||
2178 | csum_error: | |
2179 | /* | |
2180 | * RFC1122: OK. Discards the bad packet silently (as far as | |
2181 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). | |
2182 | */ | |
ba7a46f1 JP |
2183 | net_dbg_ratelimited("UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
2184 | proto == IPPROTO_UDPLITE ? "Lite" : "", | |
2185 | &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest), | |
2186 | ulen); | |
02c22347 | 2187 | __UDP_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 | 2188 | drop: |
02c22347 | 2189 | __UDP_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
2190 | kfree_skb(skb); |
2191 | return 0; | |
2192 | } | |
2193 | ||
421b3885 SB |
2194 | /* We can only early demux multicast if there is a single matching socket. |
2195 | * If more than one socket found returns NULL | |
2196 | */ | |
2197 | static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net, | |
2198 | __be16 loc_port, __be32 loc_addr, | |
2199 | __be16 rmt_port, __be32 rmt_addr, | |
fb74c277 | 2200 | int dif, int sdif) |
421b3885 SB |
2201 | { |
2202 | struct sock *sk, *result; | |
421b3885 | 2203 | unsigned short hnum = ntohs(loc_port); |
ca065d0c | 2204 | unsigned int slot = udp_hashfn(net, hnum, udp_table.mask); |
421b3885 SB |
2205 | struct udp_hslot *hslot = &udp_table.hash[slot]; |
2206 | ||
63c6f81c ED |
2207 | /* Do not bother scanning a too big list */ |
2208 | if (hslot->count > 10) | |
2209 | return NULL; | |
2210 | ||
421b3885 | 2211 | result = NULL; |
ca065d0c ED |
2212 | sk_for_each_rcu(sk, &hslot->head) { |
2213 | if (__udp_is_mcast_sock(net, sk, loc_port, loc_addr, | |
fb74c277 | 2214 | rmt_port, rmt_addr, dif, sdif, hnum)) { |
ca065d0c ED |
2215 | if (result) |
2216 | return NULL; | |
421b3885 | 2217 | result = sk; |
421b3885 SB |
2218 | } |
2219 | } | |
ca065d0c | 2220 | |
421b3885 SB |
2221 | return result; |
2222 | } | |
2223 | ||
2224 | /* For unicast we should only early demux connected sockets or we can | |
2225 | * break forwarding setups. The chains here can be long so only check | |
2226 | * if the first socket is an exact match and if not move on. | |
2227 | */ | |
2228 | static struct sock *__udp4_lib_demux_lookup(struct net *net, | |
2229 | __be16 loc_port, __be32 loc_addr, | |
2230 | __be16 rmt_port, __be32 rmt_addr, | |
3fa6f616 | 2231 | int dif, int sdif) |
421b3885 | 2232 | { |
421b3885 SB |
2233 | unsigned short hnum = ntohs(loc_port); |
2234 | unsigned int hash2 = udp4_portaddr_hash(net, loc_addr, hnum); | |
2235 | unsigned int slot2 = hash2 & udp_table.mask; | |
2236 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; | |
c7228317 | 2237 | INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr); |
421b3885 | 2238 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); |
ca065d0c | 2239 | struct sock *sk; |
421b3885 | 2240 | |
ca065d0c ED |
2241 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
2242 | if (INET_MATCH(sk, net, acookie, rmt_addr, | |
3fa6f616 | 2243 | loc_addr, ports, dif, sdif)) |
ca065d0c | 2244 | return sk; |
421b3885 SB |
2245 | /* Only check first socket in chain */ |
2246 | break; | |
2247 | } | |
ca065d0c | 2248 | return NULL; |
421b3885 SB |
2249 | } |
2250 | ||
7487449c | 2251 | int udp_v4_early_demux(struct sk_buff *skb) |
421b3885 | 2252 | { |
610438b7 | 2253 | struct net *net = dev_net(skb->dev); |
bc044e8d | 2254 | struct in_device *in_dev = NULL; |
610438b7 ED |
2255 | const struct iphdr *iph; |
2256 | const struct udphdr *uh; | |
ca065d0c | 2257 | struct sock *sk = NULL; |
421b3885 | 2258 | struct dst_entry *dst; |
421b3885 | 2259 | int dif = skb->dev->ifindex; |
fb74c277 | 2260 | int sdif = inet_sdif(skb); |
6e540309 | 2261 | int ours; |
421b3885 SB |
2262 | |
2263 | /* validate the packet */ | |
2264 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct udphdr))) | |
7487449c | 2265 | return 0; |
421b3885 | 2266 | |
610438b7 ED |
2267 | iph = ip_hdr(skb); |
2268 | uh = udp_hdr(skb); | |
2269 | ||
996b44fc | 2270 | if (skb->pkt_type == PACKET_MULTICAST) { |
bc044e8d | 2271 | in_dev = __in_dev_get_rcu(skb->dev); |
6e540309 SB |
2272 | |
2273 | if (!in_dev) | |
7487449c | 2274 | return 0; |
6e540309 | 2275 | |
996b44fc PA |
2276 | ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr, |
2277 | iph->protocol); | |
2278 | if (!ours) | |
2279 | return 0; | |
ad0ea198 | 2280 | |
421b3885 | 2281 | sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr, |
fb74c277 DA |
2282 | uh->source, iph->saddr, |
2283 | dif, sdif); | |
6e540309 | 2284 | } else if (skb->pkt_type == PACKET_HOST) { |
421b3885 | 2285 | sk = __udp4_lib_demux_lookup(net, uh->dest, iph->daddr, |
3fa6f616 | 2286 | uh->source, iph->saddr, dif, sdif); |
6e540309 | 2287 | } |
421b3885 | 2288 | |
41c6d650 | 2289 | if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) |
7487449c | 2290 | return 0; |
421b3885 SB |
2291 | |
2292 | skb->sk = sk; | |
82eabd9e | 2293 | skb->destructor = sock_efree; |
10e2eb87 | 2294 | dst = READ_ONCE(sk->sk_rx_dst); |
421b3885 SB |
2295 | |
2296 | if (dst) | |
2297 | dst = dst_check(dst, 0); | |
10e2eb87 | 2298 | if (dst) { |
bc044e8d PA |
2299 | u32 itag = 0; |
2300 | ||
d24406c8 WW |
2301 | /* set noref for now. |
2302 | * any place which wants to hold dst has to call | |
2303 | * dst_hold_safe() | |
2304 | */ | |
2305 | skb_dst_set_noref(skb, dst); | |
bc044e8d PA |
2306 | |
2307 | /* for unconnected multicast sockets we need to validate | |
2308 | * the source on each packet | |
2309 | */ | |
2310 | if (!inet_sk(sk)->inet_daddr && in_dev) | |
2311 | return ip_mc_validate_source(skb, iph->daddr, | |
2312 | iph->saddr, iph->tos, | |
2313 | skb->dev, in_dev, &itag); | |
10e2eb87 | 2314 | } |
7487449c | 2315 | return 0; |
421b3885 SB |
2316 | } |
2317 | ||
db8dac20 DM |
2318 | int udp_rcv(struct sk_buff *skb) |
2319 | { | |
645ca708 | 2320 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
db8dac20 DM |
2321 | } |
2322 | ||
7d06b2e0 | 2323 | void udp_destroy_sock(struct sock *sk) |
db8dac20 | 2324 | { |
44046a59 | 2325 | struct udp_sock *up = udp_sk(sk); |
8a74ad60 | 2326 | bool slow = lock_sock_fast(sk); |
db8dac20 | 2327 | udp_flush_pending_frames(sk); |
8a74ad60 | 2328 | unlock_sock_fast(sk, slow); |
44046a59 TP |
2329 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
2330 | void (*encap_destroy)(struct sock *sk); | |
6aa7de05 | 2331 | encap_destroy = READ_ONCE(up->encap_destroy); |
44046a59 TP |
2332 | if (encap_destroy) |
2333 | encap_destroy(sk); | |
2334 | } | |
db8dac20 DM |
2335 | } |
2336 | ||
1da177e4 LT |
2337 | /* |
2338 | * Socket option code for UDP | |
2339 | */ | |
4c0a6cb0 | 2340 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 2341 | char __user *optval, unsigned int optlen, |
4c0a6cb0 | 2342 | int (*push_pending_frames)(struct sock *)) |
1da177e4 LT |
2343 | { |
2344 | struct udp_sock *up = udp_sk(sk); | |
1c19448c | 2345 | int val, valbool; |
1da177e4 | 2346 | int err = 0; |
b2bf1e26 | 2347 | int is_udplite = IS_UDPLITE(sk); |
1da177e4 | 2348 | |
c482c568 | 2349 | if (optlen < sizeof(int)) |
1da177e4 LT |
2350 | return -EINVAL; |
2351 | ||
2352 | if (get_user(val, (int __user *)optval)) | |
2353 | return -EFAULT; | |
2354 | ||
1c19448c TH |
2355 | valbool = val ? 1 : 0; |
2356 | ||
6516c655 | 2357 | switch (optname) { |
1da177e4 LT |
2358 | case UDP_CORK: |
2359 | if (val != 0) { | |
2360 | up->corkflag = 1; | |
2361 | } else { | |
2362 | up->corkflag = 0; | |
2363 | lock_sock(sk); | |
4243cdc2 | 2364 | push_pending_frames(sk); |
1da177e4 LT |
2365 | release_sock(sk); |
2366 | } | |
2367 | break; | |
e905a9ed | 2368 | |
1da177e4 LT |
2369 | case UDP_ENCAP: |
2370 | switch (val) { | |
2371 | case 0: | |
2372 | case UDP_ENCAP_ESPINUDP: | |
2373 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
067b207b JC |
2374 | up->encap_rcv = xfrm4_udp_encap_rcv; |
2375 | /* FALLTHROUGH */ | |
342f0234 | 2376 | case UDP_ENCAP_L2TPINUDP: |
1da177e4 | 2377 | up->encap_type = val; |
447167bf | 2378 | udp_encap_enable(); |
1da177e4 LT |
2379 | break; |
2380 | default: | |
2381 | err = -ENOPROTOOPT; | |
2382 | break; | |
2383 | } | |
2384 | break; | |
2385 | ||
1c19448c TH |
2386 | case UDP_NO_CHECK6_TX: |
2387 | up->no_check6_tx = valbool; | |
2388 | break; | |
2389 | ||
2390 | case UDP_NO_CHECK6_RX: | |
2391 | up->no_check6_rx = valbool; | |
2392 | break; | |
2393 | ||
ba4e58ec GR |
2394 | /* |
2395 | * UDP-Lite's partial checksum coverage (RFC 3828). | |
2396 | */ | |
2397 | /* The sender sets actual checksum coverage length via this option. | |
2398 | * The case coverage > packet length is handled by send module. */ | |
2399 | case UDPLITE_SEND_CSCOV: | |
b2bf1e26 | 2400 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
2401 | return -ENOPROTOOPT; |
2402 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ | |
2403 | val = 8; | |
4be929be AD |
2404 | else if (val > USHRT_MAX) |
2405 | val = USHRT_MAX; | |
ba4e58ec GR |
2406 | up->pcslen = val; |
2407 | up->pcflag |= UDPLITE_SEND_CC; | |
2408 | break; | |
2409 | ||
e905a9ed YH |
2410 | /* The receiver specifies a minimum checksum coverage value. To make |
2411 | * sense, this should be set to at least 8 (as done below). If zero is | |
ba4e58ec GR |
2412 | * used, this again means full checksum coverage. */ |
2413 | case UDPLITE_RECV_CSCOV: | |
b2bf1e26 | 2414 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
2415 | return -ENOPROTOOPT; |
2416 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ | |
2417 | val = 8; | |
4be929be AD |
2418 | else if (val > USHRT_MAX) |
2419 | val = USHRT_MAX; | |
ba4e58ec GR |
2420 | up->pcrlen = val; |
2421 | up->pcflag |= UDPLITE_RECV_CC; | |
2422 | break; | |
2423 | ||
1da177e4 LT |
2424 | default: |
2425 | err = -ENOPROTOOPT; | |
2426 | break; | |
6516c655 | 2427 | } |
1da177e4 LT |
2428 | |
2429 | return err; | |
2430 | } | |
c482c568 | 2431 | EXPORT_SYMBOL(udp_lib_setsockopt); |
1da177e4 | 2432 | |
db8dac20 | 2433 | int udp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 2434 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
2435 | { |
2436 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
2437 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
2438 | udp_push_pending_frames); | |
2439 | return ip_setsockopt(sk, level, optname, optval, optlen); | |
2440 | } | |
2441 | ||
2442 | #ifdef CONFIG_COMPAT | |
2443 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 2444 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
2445 | { |
2446 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
2447 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
2448 | udp_push_pending_frames); | |
2449 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); | |
2450 | } | |
2451 | #endif | |
2452 | ||
4c0a6cb0 GR |
2453 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
2454 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
2455 | { |
2456 | struct udp_sock *up = udp_sk(sk); | |
2457 | int val, len; | |
2458 | ||
c482c568 | 2459 | if (get_user(len, optlen)) |
1da177e4 LT |
2460 | return -EFAULT; |
2461 | ||
2462 | len = min_t(unsigned int, len, sizeof(int)); | |
e905a9ed | 2463 | |
6516c655 | 2464 | if (len < 0) |
1da177e4 LT |
2465 | return -EINVAL; |
2466 | ||
6516c655 | 2467 | switch (optname) { |
1da177e4 LT |
2468 | case UDP_CORK: |
2469 | val = up->corkflag; | |
2470 | break; | |
2471 | ||
2472 | case UDP_ENCAP: | |
2473 | val = up->encap_type; | |
2474 | break; | |
2475 | ||
1c19448c TH |
2476 | case UDP_NO_CHECK6_TX: |
2477 | val = up->no_check6_tx; | |
2478 | break; | |
2479 | ||
2480 | case UDP_NO_CHECK6_RX: | |
2481 | val = up->no_check6_rx; | |
2482 | break; | |
2483 | ||
ba4e58ec GR |
2484 | /* The following two cannot be changed on UDP sockets, the return is |
2485 | * always 0 (which corresponds to the full checksum coverage of UDP). */ | |
2486 | case UDPLITE_SEND_CSCOV: | |
2487 | val = up->pcslen; | |
2488 | break; | |
2489 | ||
2490 | case UDPLITE_RECV_CSCOV: | |
2491 | val = up->pcrlen; | |
2492 | break; | |
2493 | ||
1da177e4 LT |
2494 | default: |
2495 | return -ENOPROTOOPT; | |
6516c655 | 2496 | } |
1da177e4 | 2497 | |
6516c655 | 2498 | if (put_user(len, optlen)) |
e905a9ed | 2499 | return -EFAULT; |
c482c568 | 2500 | if (copy_to_user(optval, &val, len)) |
1da177e4 | 2501 | return -EFAULT; |
e905a9ed | 2502 | return 0; |
1da177e4 | 2503 | } |
c482c568 | 2504 | EXPORT_SYMBOL(udp_lib_getsockopt); |
1da177e4 | 2505 | |
db8dac20 DM |
2506 | int udp_getsockopt(struct sock *sk, int level, int optname, |
2507 | char __user *optval, int __user *optlen) | |
2508 | { | |
2509 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
2510 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
2511 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
2512 | } | |
2513 | ||
2514 | #ifdef CONFIG_COMPAT | |
2515 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, | |
2516 | char __user *optval, int __user *optlen) | |
2517 | { | |
2518 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
2519 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
2520 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); | |
2521 | } | |
2522 | #endif | |
1da177e4 LT |
2523 | /** |
2524 | * udp_poll - wait for a UDP event. | |
2525 | * @file - file struct | |
2526 | * @sock - socket | |
2527 | * @wait - poll table | |
2528 | * | |
e905a9ed | 2529 | * This is same as datagram poll, except for the special case of |
1da177e4 LT |
2530 | * blocking sockets. If application is using a blocking fd |
2531 | * and a packet with checksum error is in the queue; | |
2532 | * then it could get return from select indicating data available | |
2533 | * but then block when reading it. Add special case code | |
2534 | * to work around these arguably broken applications. | |
2535 | */ | |
2536 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) | |
2537 | { | |
2538 | unsigned int mask = datagram_poll(file, sock, wait); | |
2539 | struct sock *sk = sock->sk; | |
ba4e58ec | 2540 | |
2276f58a PA |
2541 | if (!skb_queue_empty(&udp_sk(sk)->reader_queue)) |
2542 | mask |= POLLIN | POLLRDNORM; | |
2543 | ||
c3f1dbaf DM |
2544 | sock_rps_record_flow(sk); |
2545 | ||
1da177e4 | 2546 | /* Check for false positives due to checksum errors */ |
85584672 | 2547 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
e83c6744 | 2548 | !(sk->sk_shutdown & RCV_SHUTDOWN) && first_packet_length(sk) == -1) |
85584672 | 2549 | mask &= ~(POLLIN | POLLRDNORM); |
1da177e4 LT |
2550 | |
2551 | return mask; | |
e905a9ed | 2552 | |
1da177e4 | 2553 | } |
c482c568 | 2554 | EXPORT_SYMBOL(udp_poll); |
1da177e4 | 2555 | |
5d77dca8 DA |
2556 | int udp_abort(struct sock *sk, int err) |
2557 | { | |
2558 | lock_sock(sk); | |
2559 | ||
2560 | sk->sk_err = err; | |
2561 | sk->sk_error_report(sk); | |
286c72de | 2562 | __udp_disconnect(sk, 0); |
5d77dca8 DA |
2563 | |
2564 | release_sock(sk); | |
2565 | ||
2566 | return 0; | |
2567 | } | |
2568 | EXPORT_SYMBOL_GPL(udp_abort); | |
2569 | ||
db8dac20 DM |
2570 | struct proto udp_prot = { |
2571 | .name = "UDP", | |
2572 | .owner = THIS_MODULE, | |
2573 | .close = udp_lib_close, | |
2574 | .connect = ip4_datagram_connect, | |
2575 | .disconnect = udp_disconnect, | |
2576 | .ioctl = udp_ioctl, | |
850cbadd | 2577 | .init = udp_init_sock, |
db8dac20 DM |
2578 | .destroy = udp_destroy_sock, |
2579 | .setsockopt = udp_setsockopt, | |
2580 | .getsockopt = udp_getsockopt, | |
2581 | .sendmsg = udp_sendmsg, | |
2582 | .recvmsg = udp_recvmsg, | |
2583 | .sendpage = udp_sendpage, | |
8141ed9f | 2584 | .release_cb = ip4_datagram_release_cb, |
db8dac20 DM |
2585 | .hash = udp_lib_hash, |
2586 | .unhash = udp_lib_unhash, | |
719f8358 | 2587 | .rehash = udp_v4_rehash, |
db8dac20 DM |
2588 | .get_port = udp_v4_get_port, |
2589 | .memory_allocated = &udp_memory_allocated, | |
2590 | .sysctl_mem = sysctl_udp_mem, | |
2591 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
2592 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
2593 | .obj_size = sizeof(struct udp_sock), | |
645ca708 | 2594 | .h.udp_table = &udp_table, |
db8dac20 DM |
2595 | #ifdef CONFIG_COMPAT |
2596 | .compat_setsockopt = compat_udp_setsockopt, | |
2597 | .compat_getsockopt = compat_udp_getsockopt, | |
2598 | #endif | |
5d77dca8 | 2599 | .diag_destroy = udp_abort, |
db8dac20 | 2600 | }; |
c482c568 | 2601 | EXPORT_SYMBOL(udp_prot); |
1da177e4 LT |
2602 | |
2603 | /* ------------------------------------------------------------------------ */ | |
2604 | #ifdef CONFIG_PROC_FS | |
2605 | ||
645ca708 | 2606 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
1da177e4 LT |
2607 | { |
2608 | struct sock *sk; | |
2609 | struct udp_iter_state *state = seq->private; | |
6f191efe | 2610 | struct net *net = seq_file_net(seq); |
1da177e4 | 2611 | |
f86dcc5a ED |
2612 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
2613 | ++state->bucket) { | |
645ca708 | 2614 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
f86dcc5a | 2615 | |
ca065d0c | 2616 | if (hlist_empty(&hslot->head)) |
f86dcc5a ED |
2617 | continue; |
2618 | ||
645ca708 | 2619 | spin_lock_bh(&hslot->lock); |
ca065d0c | 2620 | sk_for_each(sk, &hslot->head) { |
878628fb | 2621 | if (!net_eq(sock_net(sk), net)) |
a91275ef | 2622 | continue; |
1da177e4 LT |
2623 | if (sk->sk_family == state->family) |
2624 | goto found; | |
2625 | } | |
645ca708 | 2626 | spin_unlock_bh(&hslot->lock); |
1da177e4 LT |
2627 | } |
2628 | sk = NULL; | |
2629 | found: | |
2630 | return sk; | |
2631 | } | |
2632 | ||
2633 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) | |
2634 | { | |
2635 | struct udp_iter_state *state = seq->private; | |
6f191efe | 2636 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2637 | |
2638 | do { | |
ca065d0c | 2639 | sk = sk_next(sk); |
878628fb | 2640 | } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); |
1da177e4 | 2641 | |
645ca708 | 2642 | if (!sk) { |
f86dcc5a | 2643 | if (state->bucket <= state->udp_table->mask) |
30842f29 | 2644 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
645ca708 | 2645 | return udp_get_first(seq, state->bucket + 1); |
1da177e4 LT |
2646 | } |
2647 | return sk; | |
2648 | } | |
2649 | ||
2650 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) | |
2651 | { | |
645ca708 | 2652 | struct sock *sk = udp_get_first(seq, 0); |
1da177e4 LT |
2653 | |
2654 | if (sk) | |
6516c655 | 2655 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
1da177e4 LT |
2656 | --pos; |
2657 | return pos ? NULL : sk; | |
2658 | } | |
2659 | ||
2660 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) | |
2661 | { | |
30842f29 | 2662 | struct udp_iter_state *state = seq->private; |
f86dcc5a | 2663 | state->bucket = MAX_UDP_PORTS; |
30842f29 | 2664 | |
b50660f1 | 2665 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
1da177e4 LT |
2666 | } |
2667 | ||
2668 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2669 | { | |
2670 | struct sock *sk; | |
2671 | ||
b50660f1 | 2672 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2673 | sk = udp_get_idx(seq, 0); |
2674 | else | |
2675 | sk = udp_get_next(seq, v); | |
2676 | ||
2677 | ++*pos; | |
2678 | return sk; | |
2679 | } | |
2680 | ||
2681 | static void udp_seq_stop(struct seq_file *seq, void *v) | |
2682 | { | |
645ca708 ED |
2683 | struct udp_iter_state *state = seq->private; |
2684 | ||
f86dcc5a | 2685 | if (state->bucket <= state->udp_table->mask) |
645ca708 | 2686 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
1da177e4 LT |
2687 | } |
2688 | ||
73cb88ec | 2689 | int udp_seq_open(struct inode *inode, struct file *file) |
1da177e4 | 2690 | { |
d9dda78b | 2691 | struct udp_seq_afinfo *afinfo = PDE_DATA(inode); |
a2be75c1 DL |
2692 | struct udp_iter_state *s; |
2693 | int err; | |
a91275ef | 2694 | |
a2be75c1 DL |
2695 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
2696 | sizeof(struct udp_iter_state)); | |
2697 | if (err < 0) | |
2698 | return err; | |
a91275ef | 2699 | |
a2be75c1 | 2700 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 2701 | s->family = afinfo->family; |
645ca708 | 2702 | s->udp_table = afinfo->udp_table; |
a2be75c1 | 2703 | return err; |
a91275ef | 2704 | } |
73cb88ec | 2705 | EXPORT_SYMBOL(udp_seq_open); |
a91275ef | 2706 | |
1da177e4 | 2707 | /* ------------------------------------------------------------------------ */ |
0c96d8c5 | 2708 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 LT |
2709 | { |
2710 | struct proc_dir_entry *p; | |
2711 | int rc = 0; | |
2712 | ||
dda61925 DL |
2713 | afinfo->seq_ops.start = udp_seq_start; |
2714 | afinfo->seq_ops.next = udp_seq_next; | |
2715 | afinfo->seq_ops.stop = udp_seq_stop; | |
2716 | ||
84841c3c | 2717 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
73cb88ec | 2718 | afinfo->seq_fops, afinfo); |
84841c3c | 2719 | if (!p) |
1da177e4 LT |
2720 | rc = -ENOMEM; |
2721 | return rc; | |
2722 | } | |
c482c568 | 2723 | EXPORT_SYMBOL(udp_proc_register); |
1da177e4 | 2724 | |
0c96d8c5 | 2725 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 | 2726 | { |
ece31ffd | 2727 | remove_proc_entry(afinfo->name, net->proc_net); |
1da177e4 | 2728 | } |
c482c568 | 2729 | EXPORT_SYMBOL(udp_proc_unregister); |
db8dac20 DM |
2730 | |
2731 | /* ------------------------------------------------------------------------ */ | |
5e659e4c | 2732 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
652586df | 2733 | int bucket) |
db8dac20 DM |
2734 | { |
2735 | struct inet_sock *inet = inet_sk(sp); | |
c720c7e8 ED |
2736 | __be32 dest = inet->inet_daddr; |
2737 | __be32 src = inet->inet_rcv_saddr; | |
2738 | __u16 destp = ntohs(inet->inet_dport); | |
2739 | __u16 srcp = ntohs(inet->inet_sport); | |
db8dac20 | 2740 | |
f86dcc5a | 2741 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
652586df | 2742 | " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d", |
db8dac20 | 2743 | bucket, src, srcp, dest, destp, sp->sk_state, |
31e6d363 | 2744 | sk_wmem_alloc_get(sp), |
8b4099ff | 2745 | udp_rqueue_get(sp), |
a7cb5a49 EB |
2746 | 0, 0L, 0, |
2747 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
2748 | 0, sock_i_ino(sp), | |
41c6d650 | 2749 | refcount_read(&sp->sk_refcnt), sp, |
652586df | 2750 | atomic_read(&sp->sk_drops)); |
db8dac20 DM |
2751 | } |
2752 | ||
2753 | int udp4_seq_show(struct seq_file *seq, void *v) | |
2754 | { | |
652586df | 2755 | seq_setwidth(seq, 127); |
db8dac20 | 2756 | if (v == SEQ_START_TOKEN) |
652586df | 2757 | seq_puts(seq, " sl local_address rem_address st tx_queue " |
db8dac20 | 2758 | "rx_queue tr tm->when retrnsmt uid timeout " |
cb61cb9b | 2759 | "inode ref pointer drops"); |
db8dac20 | 2760 | else { |
db8dac20 DM |
2761 | struct udp_iter_state *state = seq->private; |
2762 | ||
652586df | 2763 | udp4_format_sock(v, seq, state->bucket); |
db8dac20 | 2764 | } |
652586df | 2765 | seq_pad(seq, '\n'); |
db8dac20 DM |
2766 | return 0; |
2767 | } | |
2768 | ||
73cb88ec AV |
2769 | static const struct file_operations udp_afinfo_seq_fops = { |
2770 | .owner = THIS_MODULE, | |
2771 | .open = udp_seq_open, | |
2772 | .read = seq_read, | |
2773 | .llseek = seq_lseek, | |
2774 | .release = seq_release_net | |
2775 | }; | |
2776 | ||
db8dac20 | 2777 | /* ------------------------------------------------------------------------ */ |
db8dac20 | 2778 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
db8dac20 DM |
2779 | .name = "udp", |
2780 | .family = AF_INET, | |
645ca708 | 2781 | .udp_table = &udp_table, |
73cb88ec | 2782 | .seq_fops = &udp_afinfo_seq_fops, |
dda61925 DL |
2783 | .seq_ops = { |
2784 | .show = udp4_seq_show, | |
2785 | }, | |
db8dac20 DM |
2786 | }; |
2787 | ||
2c8c1e72 | 2788 | static int __net_init udp4_proc_init_net(struct net *net) |
15439feb PE |
2789 | { |
2790 | return udp_proc_register(net, &udp4_seq_afinfo); | |
2791 | } | |
2792 | ||
2c8c1e72 | 2793 | static void __net_exit udp4_proc_exit_net(struct net *net) |
15439feb PE |
2794 | { |
2795 | udp_proc_unregister(net, &udp4_seq_afinfo); | |
2796 | } | |
2797 | ||
2798 | static struct pernet_operations udp4_net_ops = { | |
2799 | .init = udp4_proc_init_net, | |
2800 | .exit = udp4_proc_exit_net, | |
2801 | }; | |
2802 | ||
db8dac20 DM |
2803 | int __init udp4_proc_init(void) |
2804 | { | |
15439feb | 2805 | return register_pernet_subsys(&udp4_net_ops); |
db8dac20 DM |
2806 | } |
2807 | ||
2808 | void udp4_proc_exit(void) | |
2809 | { | |
15439feb | 2810 | unregister_pernet_subsys(&udp4_net_ops); |
db8dac20 | 2811 | } |
1da177e4 LT |
2812 | #endif /* CONFIG_PROC_FS */ |
2813 | ||
f86dcc5a ED |
2814 | static __initdata unsigned long uhash_entries; |
2815 | static int __init set_uhash_entries(char *str) | |
645ca708 | 2816 | { |
413c27d8 EZ |
2817 | ssize_t ret; |
2818 | ||
f86dcc5a ED |
2819 | if (!str) |
2820 | return 0; | |
413c27d8 EZ |
2821 | |
2822 | ret = kstrtoul(str, 0, &uhash_entries); | |
2823 | if (ret) | |
2824 | return 0; | |
2825 | ||
f86dcc5a ED |
2826 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) |
2827 | uhash_entries = UDP_HTABLE_SIZE_MIN; | |
2828 | return 1; | |
2829 | } | |
2830 | __setup("uhash_entries=", set_uhash_entries); | |
645ca708 | 2831 | |
f86dcc5a ED |
2832 | void __init udp_table_init(struct udp_table *table, const char *name) |
2833 | { | |
2834 | unsigned int i; | |
2835 | ||
31fe62b9 TB |
2836 | table->hash = alloc_large_system_hash(name, |
2837 | 2 * sizeof(struct udp_hslot), | |
2838 | uhash_entries, | |
2839 | 21, /* one slot per 2 MB */ | |
2840 | 0, | |
2841 | &table->log, | |
2842 | &table->mask, | |
2843 | UDP_HTABLE_SIZE_MIN, | |
2844 | 64 * 1024); | |
2845 | ||
512615b6 | 2846 | table->hash2 = table->hash + (table->mask + 1); |
f86dcc5a | 2847 | for (i = 0; i <= table->mask; i++) { |
ca065d0c | 2848 | INIT_HLIST_HEAD(&table->hash[i].head); |
fdcc8aa9 | 2849 | table->hash[i].count = 0; |
645ca708 ED |
2850 | spin_lock_init(&table->hash[i].lock); |
2851 | } | |
512615b6 | 2852 | for (i = 0; i <= table->mask; i++) { |
ca065d0c | 2853 | INIT_HLIST_HEAD(&table->hash2[i].head); |
512615b6 ED |
2854 | table->hash2[i].count = 0; |
2855 | spin_lock_init(&table->hash2[i].lock); | |
2856 | } | |
645ca708 ED |
2857 | } |
2858 | ||
723b8e46 TH |
2859 | u32 udp_flow_hashrnd(void) |
2860 | { | |
2861 | static u32 hashrnd __read_mostly; | |
2862 | ||
2863 | net_get_random_once(&hashrnd, sizeof(hashrnd)); | |
2864 | ||
2865 | return hashrnd; | |
2866 | } | |
2867 | EXPORT_SYMBOL(udp_flow_hashrnd); | |
2868 | ||
95766fff HA |
2869 | void __init udp_init(void) |
2870 | { | |
f03d78db | 2871 | unsigned long limit; |
4b272750 | 2872 | unsigned int i; |
95766fff | 2873 | |
f86dcc5a | 2874 | udp_table_init(&udp_table, "UDP"); |
f03d78db | 2875 | limit = nr_free_buffer_pages() / 8; |
95766fff HA |
2876 | limit = max(limit, 128UL); |
2877 | sysctl_udp_mem[0] = limit / 4 * 3; | |
2878 | sysctl_udp_mem[1] = limit; | |
2879 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; | |
2880 | ||
2881 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; | |
2882 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; | |
4b272750 ED |
2883 | |
2884 | /* 16 spinlocks per cpu */ | |
2885 | udp_busylocks_log = ilog2(nr_cpu_ids) + 4; | |
2886 | udp_busylocks = kmalloc(sizeof(spinlock_t) << udp_busylocks_log, | |
2887 | GFP_KERNEL); | |
2888 | if (!udp_busylocks) | |
2889 | panic("UDP: failed to alloc udp_busylocks\n"); | |
2890 | for (i = 0; i < (1U << udp_busylocks_log); i++) | |
2891 | spin_lock_init(udp_busylocks + i); | |
95766fff | 2892 | } |