Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * The User Datagram Protocol (UDP). | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> | |
113aa838 | 11 | * Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
12 | * Hirokazu Takahashi, <taka@valinux.co.jp> |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : verify_area() calls | |
16 | * Alan Cox : stopped close while in use off icmp | |
17 | * messages. Not a fix but a botch that | |
18 | * for udp at least is 'valid'. | |
19 | * Alan Cox : Fixed icmp handling properly | |
20 | * Alan Cox : Correct error for oversized datagrams | |
e905a9ed YH |
21 | * Alan Cox : Tidied select() semantics. |
22 | * Alan Cox : udp_err() fixed properly, also now | |
1da177e4 LT |
23 | * select and read wake correctly on errors |
24 | * Alan Cox : udp_send verify_area moved to avoid mem leak | |
25 | * Alan Cox : UDP can count its memory | |
26 | * Alan Cox : send to an unknown connection causes | |
27 | * an ECONNREFUSED off the icmp, but | |
28 | * does NOT close. | |
29 | * Alan Cox : Switched to new sk_buff handlers. No more backlog! | |
30 | * Alan Cox : Using generic datagram code. Even smaller and the PEEK | |
31 | * bug no longer crashes it. | |
32 | * Fred Van Kempen : Net2e support for sk->broadcast. | |
33 | * Alan Cox : Uses skb_free_datagram | |
34 | * Alan Cox : Added get/set sockopt support. | |
35 | * Alan Cox : Broadcasting without option set returns EACCES. | |
36 | * Alan Cox : No wakeup calls. Instead we now use the callbacks. | |
37 | * Alan Cox : Use ip_tos and ip_ttl | |
38 | * Alan Cox : SNMP Mibs | |
39 | * Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support. | |
40 | * Matt Dillon : UDP length checks. | |
41 | * Alan Cox : Smarter af_inet used properly. | |
42 | * Alan Cox : Use new kernel side addressing. | |
43 | * Alan Cox : Incorrect return on truncated datagram receive. | |
44 | * Arnt Gulbrandsen : New udp_send and stuff | |
45 | * Alan Cox : Cache last socket | |
46 | * Alan Cox : Route cache | |
47 | * Jon Peatfield : Minor efficiency fix to sendto(). | |
48 | * Mike Shaver : RFC1122 checks. | |
49 | * Alan Cox : Nonblocking error fix. | |
50 | * Willy Konynenberg : Transparent proxying support. | |
51 | * Mike McLagan : Routing by source | |
52 | * David S. Miller : New socket lookup architecture. | |
53 | * Last socket cache retained as it | |
54 | * does have a high hit rate. | |
55 | * Olaf Kirch : Don't linearise iovec on sendmsg. | |
56 | * Andi Kleen : Some cleanups, cache destination entry | |
e905a9ed | 57 | * for connect. |
1da177e4 LT |
58 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. |
59 | * Melvin Smith : Check msg_name not msg_namelen in sendto(), | |
60 | * return ENOTCONN for unconnected sockets (POSIX) | |
61 | * Janos Farkas : don't deliver multi/broadcasts to a different | |
62 | * bound-to-device socket | |
63 | * Hirokazu Takahashi : HW checksumming for outgoing UDP | |
64 | * datagrams. | |
65 | * Hirokazu Takahashi : sendfile() on UDP works now. | |
66 | * Arnaldo C. Melo : convert /proc/net/udp to seq_file | |
67 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
68 | * Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind | |
69 | * a single port at the same time. | |
70 | * Derek Atkins <derek@ihtfp.com>: Add Encapulation Support | |
342f0234 | 71 | * James Chapman : Add L2TP encapsulation type. |
1da177e4 LT |
72 | * |
73 | * | |
74 | * This program is free software; you can redistribute it and/or | |
75 | * modify it under the terms of the GNU General Public License | |
76 | * as published by the Free Software Foundation; either version | |
77 | * 2 of the License, or (at your option) any later version. | |
78 | */ | |
e905a9ed | 79 | |
afd46503 JP |
80 | #define pr_fmt(fmt) "UDP: " fmt |
81 | ||
1da177e4 LT |
82 | #include <asm/uaccess.h> |
83 | #include <asm/ioctls.h> | |
95766fff | 84 | #include <linux/bootmem.h> |
8203efb3 ED |
85 | #include <linux/highmem.h> |
86 | #include <linux/swap.h> | |
1da177e4 LT |
87 | #include <linux/types.h> |
88 | #include <linux/fcntl.h> | |
89 | #include <linux/module.h> | |
90 | #include <linux/socket.h> | |
91 | #include <linux/sockios.h> | |
14c85021 | 92 | #include <linux/igmp.h> |
1da177e4 LT |
93 | #include <linux/in.h> |
94 | #include <linux/errno.h> | |
95 | #include <linux/timer.h> | |
96 | #include <linux/mm.h> | |
1da177e4 | 97 | #include <linux/inet.h> |
1da177e4 | 98 | #include <linux/netdevice.h> |
5a0e3ad6 | 99 | #include <linux/slab.h> |
c752f073 | 100 | #include <net/tcp_states.h> |
1da177e4 LT |
101 | #include <linux/skbuff.h> |
102 | #include <linux/proc_fs.h> | |
103 | #include <linux/seq_file.h> | |
457c4cbc | 104 | #include <net/net_namespace.h> |
1da177e4 LT |
105 | #include <net/icmp.h> |
106 | #include <net/route.h> | |
1da177e4 LT |
107 | #include <net/checksum.h> |
108 | #include <net/xfrm.h> | |
296f7ea7 | 109 | #include <trace/events/udp.h> |
447167bf | 110 | #include <linux/static_key.h> |
22911fc5 | 111 | #include <trace/events/skb.h> |
ba4e58ec | 112 | #include "udp_impl.h" |
1da177e4 | 113 | |
f86dcc5a | 114 | struct udp_table udp_table __read_mostly; |
645ca708 | 115 | EXPORT_SYMBOL(udp_table); |
1da177e4 | 116 | |
8d987e5c | 117 | long sysctl_udp_mem[3] __read_mostly; |
95766fff | 118 | EXPORT_SYMBOL(sysctl_udp_mem); |
c482c568 ED |
119 | |
120 | int sysctl_udp_rmem_min __read_mostly; | |
95766fff | 121 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
c482c568 ED |
122 | |
123 | int sysctl_udp_wmem_min __read_mostly; | |
95766fff HA |
124 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
125 | ||
6fa3eb70 S |
126 | #ifdef UDP_SKT_WIFI |
127 | #include <linux/kallsyms.h> | |
128 | #include <linux/ftrace_event.h> | |
129 | int sysctl_udp_met_port __read_mostly = -1; | |
130 | EXPORT_SYMBOL(sysctl_udp_met_port); | |
131 | int sysctl_met_is_enable __read_mostly = -1; | |
132 | EXPORT_SYMBOL(sysctl_met_is_enable); | |
133 | #ifdef CONFIG_TRACING | |
134 | unsigned long __read_mostly udp_tracing_mark_write_addr = 0; | |
135 | #endif | |
136 | #endif | |
137 | ||
8d987e5c | 138 | atomic_long_t udp_memory_allocated; |
95766fff HA |
139 | EXPORT_SYMBOL(udp_memory_allocated); |
140 | ||
f86dcc5a ED |
141 | #define MAX_UDP_PORTS 65536 |
142 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) | |
98322f22 | 143 | |
f24d43c0 | 144 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
645ca708 | 145 | const struct udp_hslot *hslot, |
98322f22 | 146 | unsigned long *bitmap, |
f24d43c0 ED |
147 | struct sock *sk, |
148 | int (*saddr_comp)(const struct sock *sk1, | |
f86dcc5a ED |
149 | const struct sock *sk2), |
150 | unsigned int log) | |
1da177e4 | 151 | { |
f24d43c0 | 152 | struct sock *sk2; |
88ab1932 | 153 | struct hlist_nulls_node *node; |
ba418fa3 | 154 | kuid_t uid = sock_i_uid(sk); |
25030a7f | 155 | |
88ab1932 | 156 | sk_nulls_for_each(sk2, node, &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) && | |
ba418fa3 TH |
163 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
164 | !uid_eq(uid, sock_i_uid(sk2))) && | |
98322f22 ED |
165 | (*saddr_comp)(sk, sk2)) { |
166 | if (bitmap) | |
d4cada4a ED |
167 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, |
168 | bitmap); | |
98322f22 ED |
169 | else |
170 | return 1; | |
171 | } | |
25030a7f GR |
172 | return 0; |
173 | } | |
174 | ||
30fff923 ED |
175 | /* |
176 | * Note: we still hold spinlock of primary hash chain, so no other writer | |
177 | * can insert/delete a socket with local_port == num | |
178 | */ | |
179 | static int udp_lib_lport_inuse2(struct net *net, __u16 num, | |
180 | struct udp_hslot *hslot2, | |
181 | struct sock *sk, | |
182 | int (*saddr_comp)(const struct sock *sk1, | |
183 | const struct sock *sk2)) | |
184 | { | |
185 | struct sock *sk2; | |
186 | struct hlist_nulls_node *node; | |
ba418fa3 | 187 | kuid_t uid = sock_i_uid(sk); |
30fff923 ED |
188 | int res = 0; |
189 | ||
190 | spin_lock(&hslot2->lock); | |
191 | udp_portaddr_for_each_entry(sk2, node, &hslot2->head) | |
9d4fb27d JP |
192 | if (net_eq(sock_net(sk2), net) && |
193 | sk2 != sk && | |
194 | (udp_sk(sk2)->udp_port_hash == num) && | |
195 | (!sk2->sk_reuse || !sk->sk_reuse) && | |
196 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
197 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
ba418fa3 TH |
198 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
199 | !uid_eq(uid, sock_i_uid(sk2))) && | |
30fff923 ED |
200 | (*saddr_comp)(sk, sk2)) { |
201 | res = 1; | |
202 | break; | |
203 | } | |
204 | spin_unlock(&hslot2->lock); | |
205 | return res; | |
206 | } | |
207 | ||
25030a7f | 208 | /** |
6ba5a3c5 | 209 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
25030a7f GR |
210 | * |
211 | * @sk: socket struct in question | |
212 | * @snum: port number to look up | |
df2bc459 | 213 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
25985edc | 214 | * @hash2_nulladdr: AF-dependent hash value in secondary hash chains, |
30fff923 | 215 | * with NULL address |
25030a7f | 216 | */ |
6ba5a3c5 | 217 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
df2bc459 | 218 | int (*saddr_comp)(const struct sock *sk1, |
30fff923 ED |
219 | const struct sock *sk2), |
220 | unsigned int hash2_nulladdr) | |
25030a7f | 221 | { |
512615b6 | 222 | struct udp_hslot *hslot, *hslot2; |
645ca708 | 223 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
25030a7f | 224 | int error = 1; |
3b1e0a65 | 225 | struct net *net = sock_net(sk); |
1da177e4 | 226 | |
32c1da70 | 227 | if (!snum) { |
9088c560 | 228 | int low, high, remaining; |
95c96174 | 229 | unsigned int rand; |
98322f22 ED |
230 | unsigned short first, last; |
231 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); | |
32c1da70 | 232 | |
227b60f5 | 233 | inet_get_local_port_range(&low, &high); |
a25de534 | 234 | remaining = (high - low) + 1; |
227b60f5 | 235 | |
9088c560 | 236 | rand = net_random(); |
98322f22 ED |
237 | first = (((u64)rand * remaining) >> 32) + low; |
238 | /* | |
239 | * force rand to be an odd multiple of UDP_HTABLE_SIZE | |
240 | */ | |
f86dcc5a | 241 | rand = (rand | 1) * (udptable->mask + 1); |
5781b235 ED |
242 | last = first + udptable->mask + 1; |
243 | do { | |
f86dcc5a | 244 | hslot = udp_hashslot(udptable, net, first); |
98322f22 | 245 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
645ca708 | 246 | spin_lock_bh(&hslot->lock); |
98322f22 | 247 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
f86dcc5a | 248 | saddr_comp, udptable->log); |
98322f22 ED |
249 | |
250 | snum = first; | |
251 | /* | |
252 | * Iterate on all possible values of snum for this hash. | |
253 | * Using steps of an odd multiple of UDP_HTABLE_SIZE | |
254 | * give us randomization and full range coverage. | |
255 | */ | |
9088c560 | 256 | do { |
98322f22 | 257 | if (low <= snum && snum <= high && |
e3826f1e AW |
258 | !test_bit(snum >> udptable->log, bitmap) && |
259 | !inet_is_reserved_local_port(snum)) | |
98322f22 ED |
260 | goto found; |
261 | snum += rand; | |
262 | } while (snum != first); | |
263 | spin_unlock_bh(&hslot->lock); | |
5781b235 | 264 | } while (++first != last); |
98322f22 | 265 | goto fail; |
645ca708 | 266 | } else { |
f86dcc5a | 267 | hslot = udp_hashslot(udptable, net, snum); |
645ca708 | 268 | spin_lock_bh(&hslot->lock); |
30fff923 ED |
269 | if (hslot->count > 10) { |
270 | int exist; | |
271 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; | |
272 | ||
273 | slot2 &= udptable->mask; | |
274 | hash2_nulladdr &= udptable->mask; | |
275 | ||
276 | hslot2 = udp_hashslot2(udptable, slot2); | |
277 | if (hslot->count < hslot2->count) | |
278 | goto scan_primary_hash; | |
279 | ||
280 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
281 | sk, saddr_comp); | |
282 | if (!exist && (hash2_nulladdr != slot2)) { | |
283 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); | |
284 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
285 | sk, saddr_comp); | |
286 | } | |
287 | if (exist) | |
288 | goto fail_unlock; | |
289 | else | |
290 | goto found; | |
291 | } | |
292 | scan_primary_hash: | |
f86dcc5a ED |
293 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
294 | saddr_comp, 0)) | |
645ca708 ED |
295 | goto fail_unlock; |
296 | } | |
98322f22 | 297 | found: |
c720c7e8 | 298 | inet_sk(sk)->inet_num = snum; |
d4cada4a ED |
299 | udp_sk(sk)->udp_port_hash = snum; |
300 | udp_sk(sk)->udp_portaddr_hash ^= snum; | |
1da177e4 | 301 | if (sk_unhashed(sk)) { |
88ab1932 | 302 | sk_nulls_add_node_rcu(sk, &hslot->head); |
fdcc8aa9 | 303 | hslot->count++; |
c29a0bc4 | 304 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
512615b6 ED |
305 | |
306 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
307 | spin_lock(&hslot2->lock); | |
308 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, | |
309 | &hslot2->head); | |
310 | hslot2->count++; | |
311 | spin_unlock(&hslot2->lock); | |
1da177e4 | 312 | } |
25030a7f | 313 | error = 0; |
645ca708 ED |
314 | fail_unlock: |
315 | spin_unlock_bh(&hslot->lock); | |
1da177e4 | 316 | fail: |
25030a7f GR |
317 | return error; |
318 | } | |
c482c568 | 319 | EXPORT_SYMBOL(udp_lib_get_port); |
25030a7f | 320 | |
499923c7 | 321 | static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) |
db8dac20 DM |
322 | { |
323 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); | |
324 | ||
c482c568 | 325 | return (!ipv6_only_sock(sk2) && |
c720c7e8 ED |
326 | (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr || |
327 | inet1->inet_rcv_saddr == inet2->inet_rcv_saddr)); | |
db8dac20 DM |
328 | } |
329 | ||
d4cada4a ED |
330 | static unsigned int udp4_portaddr_hash(struct net *net, __be32 saddr, |
331 | unsigned int port) | |
332 | { | |
0eae88f3 | 333 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
d4cada4a ED |
334 | } |
335 | ||
6ba5a3c5 | 336 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
db8dac20 | 337 | { |
30fff923 | 338 | unsigned int hash2_nulladdr = |
0eae88f3 | 339 | udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum); |
30fff923 ED |
340 | unsigned int hash2_partial = |
341 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); | |
342 | ||
d4cada4a | 343 | /* precompute partial secondary hash */ |
30fff923 ED |
344 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
345 | return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr); | |
db8dac20 DM |
346 | } |
347 | ||
645ca708 ED |
348 | static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr, |
349 | unsigned short hnum, | |
350 | __be16 sport, __be32 daddr, __be16 dport, int dif) | |
351 | { | |
352 | int score = -1; | |
353 | ||
d4cada4a | 354 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
645ca708 ED |
355 | !ipv6_only_sock(sk)) { |
356 | struct inet_sock *inet = inet_sk(sk); | |
357 | ||
ba418fa3 | 358 | score = (sk->sk_family == PF_INET ? 2 : 1); |
c720c7e8 ED |
359 | if (inet->inet_rcv_saddr) { |
360 | if (inet->inet_rcv_saddr != daddr) | |
645ca708 | 361 | return -1; |
ba418fa3 | 362 | score += 4; |
645ca708 | 363 | } |
c720c7e8 ED |
364 | if (inet->inet_daddr) { |
365 | if (inet->inet_daddr != saddr) | |
645ca708 | 366 | return -1; |
ba418fa3 | 367 | score += 4; |
645ca708 | 368 | } |
c720c7e8 ED |
369 | if (inet->inet_dport) { |
370 | if (inet->inet_dport != sport) | |
645ca708 | 371 | return -1; |
ba418fa3 | 372 | score += 4; |
645ca708 ED |
373 | } |
374 | if (sk->sk_bound_dev_if) { | |
375 | if (sk->sk_bound_dev_if != dif) | |
376 | return -1; | |
ba418fa3 | 377 | score += 4; |
645ca708 ED |
378 | } |
379 | } | |
380 | return score; | |
381 | } | |
382 | ||
5051ebd2 ED |
383 | /* |
384 | * In this second variant, we check (daddr, dport) matches (inet_rcv_sadd, inet_num) | |
385 | */ | |
5051ebd2 ED |
386 | static inline int compute_score2(struct sock *sk, struct net *net, |
387 | __be32 saddr, __be16 sport, | |
388 | __be32 daddr, unsigned int hnum, int dif) | |
389 | { | |
390 | int score = -1; | |
391 | ||
392 | if (net_eq(sock_net(sk), net) && !ipv6_only_sock(sk)) { | |
393 | struct inet_sock *inet = inet_sk(sk); | |
394 | ||
395 | if (inet->inet_rcv_saddr != daddr) | |
396 | return -1; | |
397 | if (inet->inet_num != hnum) | |
398 | return -1; | |
399 | ||
ba418fa3 | 400 | score = (sk->sk_family == PF_INET ? 2 : 1); |
5051ebd2 ED |
401 | if (inet->inet_daddr) { |
402 | if (inet->inet_daddr != saddr) | |
403 | return -1; | |
ba418fa3 | 404 | score += 4; |
5051ebd2 ED |
405 | } |
406 | if (inet->inet_dport) { | |
407 | if (inet->inet_dport != sport) | |
408 | return -1; | |
ba418fa3 | 409 | score += 4; |
5051ebd2 ED |
410 | } |
411 | if (sk->sk_bound_dev_if) { | |
412 | if (sk->sk_bound_dev_if != dif) | |
413 | return -1; | |
ba418fa3 | 414 | score += 4; |
5051ebd2 ED |
415 | } |
416 | } | |
417 | return score; | |
418 | } | |
419 | ||
5051ebd2 ED |
420 | |
421 | /* called with read_rcu_lock() */ | |
422 | static struct sock *udp4_lib_lookup2(struct net *net, | |
423 | __be32 saddr, __be16 sport, | |
424 | __be32 daddr, unsigned int hnum, int dif, | |
425 | struct udp_hslot *hslot2, unsigned int slot2) | |
426 | { | |
427 | struct sock *sk, *result; | |
428 | struct hlist_nulls_node *node; | |
ba418fa3 TH |
429 | int score, badness, matches = 0, reuseport = 0; |
430 | u32 hash = 0; | |
5051ebd2 ED |
431 | |
432 | begin: | |
433 | result = NULL; | |
ba418fa3 | 434 | badness = 0; |
5051ebd2 ED |
435 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { |
436 | score = compute_score2(sk, net, saddr, sport, | |
437 | daddr, hnum, dif); | |
438 | if (score > badness) { | |
439 | result = sk; | |
440 | badness = score; | |
ba418fa3 TH |
441 | reuseport = sk->sk_reuseport; |
442 | if (reuseport) { | |
443 | hash = inet_ehashfn(net, daddr, hnum, | |
444 | saddr, htons(sport)); | |
445 | matches = 1; | |
446 | } | |
447 | } else if (score == badness && reuseport) { | |
448 | matches++; | |
449 | if (((u64)hash * matches) >> 32 == 0) | |
450 | result = sk; | |
451 | hash = next_pseudo_random32(hash); | |
5051ebd2 ED |
452 | } |
453 | } | |
454 | /* | |
455 | * if the nulls value we got at the end of this lookup is | |
456 | * not the expected one, we must restart lookup. | |
457 | * We probably met an item that was moved to another chain. | |
458 | */ | |
459 | if (get_nulls_value(node) != slot2) | |
460 | goto begin; | |
5051ebd2 | 461 | if (result) { |
c31504dc | 462 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
5051ebd2 ED |
463 | result = NULL; |
464 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
465 | daddr, hnum, dif) < badness)) { | |
466 | sock_put(result); | |
467 | goto begin; | |
468 | } | |
469 | } | |
470 | return result; | |
471 | } | |
472 | ||
db8dac20 DM |
473 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
474 | * harder than this. -DaveM | |
475 | */ | |
fce82338 | 476 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, |
db8dac20 | 477 | __be16 sport, __be32 daddr, __be16 dport, |
645ca708 | 478 | int dif, struct udp_table *udptable) |
db8dac20 | 479 | { |
271b72c7 | 480 | struct sock *sk, *result; |
88ab1932 | 481 | struct hlist_nulls_node *node; |
db8dac20 | 482 | unsigned short hnum = ntohs(dport); |
5051ebd2 ED |
483 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
484 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
ba418fa3 TH |
485 | int score, badness, matches = 0, reuseport = 0; |
486 | u32 hash = 0; | |
645ca708 | 487 | |
271b72c7 | 488 | rcu_read_lock(); |
5051ebd2 ED |
489 | if (hslot->count > 10) { |
490 | hash2 = udp4_portaddr_hash(net, daddr, hnum); | |
491 | slot2 = hash2 & udptable->mask; | |
492 | hslot2 = &udptable->hash2[slot2]; | |
493 | if (hslot->count < hslot2->count) | |
494 | goto begin; | |
495 | ||
496 | result = udp4_lib_lookup2(net, saddr, sport, | |
497 | daddr, hnum, dif, | |
498 | hslot2, slot2); | |
499 | if (!result) { | |
0eae88f3 | 500 | hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
5051ebd2 ED |
501 | slot2 = hash2 & udptable->mask; |
502 | hslot2 = &udptable->hash2[slot2]; | |
503 | if (hslot->count < hslot2->count) | |
504 | goto begin; | |
505 | ||
1223c67c | 506 | result = udp4_lib_lookup2(net, saddr, sport, |
0eae88f3 | 507 | htonl(INADDR_ANY), hnum, dif, |
5051ebd2 ED |
508 | hslot2, slot2); |
509 | } | |
510 | rcu_read_unlock(); | |
511 | return result; | |
512 | } | |
271b72c7 ED |
513 | begin: |
514 | result = NULL; | |
ba418fa3 | 515 | badness = 0; |
88ab1932 | 516 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
517 | score = compute_score(sk, net, saddr, hnum, sport, |
518 | daddr, dport, dif); | |
519 | if (score > badness) { | |
520 | result = sk; | |
521 | badness = score; | |
ba418fa3 TH |
522 | reuseport = sk->sk_reuseport; |
523 | if (reuseport) { | |
524 | hash = inet_ehashfn(net, daddr, hnum, | |
525 | saddr, htons(sport)); | |
526 | matches = 1; | |
527 | } | |
528 | } else if (score == badness && reuseport) { | |
529 | matches++; | |
530 | if (((u64)hash * matches) >> 32 == 0) | |
531 | result = sk; | |
532 | hash = next_pseudo_random32(hash); | |
db8dac20 DM |
533 | } |
534 | } | |
88ab1932 ED |
535 | /* |
536 | * if the nulls value we got at the end of this lookup is | |
537 | * not the expected one, we must restart lookup. | |
538 | * We probably met an item that was moved to another chain. | |
539 | */ | |
5051ebd2 | 540 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
541 | goto begin; |
542 | ||
271b72c7 | 543 | if (result) { |
c31504dc | 544 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
545 | result = NULL; |
546 | else if (unlikely(compute_score(result, net, saddr, hnum, sport, | |
547 | daddr, dport, dif) < badness)) { | |
548 | sock_put(result); | |
549 | goto begin; | |
550 | } | |
551 | } | |
552 | rcu_read_unlock(); | |
db8dac20 DM |
553 | return result; |
554 | } | |
fce82338 | 555 | EXPORT_SYMBOL_GPL(__udp4_lib_lookup); |
db8dac20 | 556 | |
607c4aaf KK |
557 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
558 | __be16 sport, __be16 dport, | |
645ca708 | 559 | struct udp_table *udptable) |
607c4aaf | 560 | { |
23542618 | 561 | struct sock *sk; |
607c4aaf KK |
562 | const struct iphdr *iph = ip_hdr(skb); |
563 | ||
23542618 KK |
564 | if (unlikely(sk = skb_steal_sock(skb))) |
565 | return sk; | |
566 | else | |
adf30907 | 567 | return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport, |
23542618 KK |
568 | iph->daddr, dport, inet_iif(skb), |
569 | udptable); | |
607c4aaf KK |
570 | } |
571 | ||
bcd41303 KK |
572 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
573 | __be32 daddr, __be16 dport, int dif) | |
574 | { | |
645ca708 | 575 | return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); |
bcd41303 KK |
576 | } |
577 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); | |
578 | ||
920a4611 | 579 | static inline struct sock *udp_v4_mcast_next(struct net *net, struct sock *sk, |
db8dac20 DM |
580 | __be16 loc_port, __be32 loc_addr, |
581 | __be16 rmt_port, __be32 rmt_addr, | |
582 | int dif) | |
583 | { | |
88ab1932 | 584 | struct hlist_nulls_node *node; |
db8dac20 DM |
585 | struct sock *s = sk; |
586 | unsigned short hnum = ntohs(loc_port); | |
587 | ||
88ab1932 | 588 | sk_nulls_for_each_from(s, node) { |
db8dac20 DM |
589 | struct inet_sock *inet = inet_sk(s); |
590 | ||
9d4fb27d JP |
591 | if (!net_eq(sock_net(s), net) || |
592 | udp_sk(s)->udp_port_hash != hnum || | |
593 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || | |
594 | (inet->inet_dport != rmt_port && inet->inet_dport) || | |
595 | (inet->inet_rcv_saddr && | |
596 | inet->inet_rcv_saddr != loc_addr) || | |
597 | ipv6_only_sock(s) || | |
db8dac20 DM |
598 | (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)) |
599 | continue; | |
600 | if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif)) | |
601 | continue; | |
602 | goto found; | |
603 | } | |
604 | s = NULL; | |
605 | found: | |
606 | return s; | |
607 | } | |
608 | ||
609 | /* | |
610 | * This routine is called by the ICMP module when it gets some | |
611 | * sort of error condition. If err < 0 then the socket should | |
612 | * be closed and the error returned to the user. If err > 0 | |
613 | * it's just the icmp type << 8 | icmp code. | |
614 | * Header points to the ip header of the error packet. We move | |
615 | * on past this. Then (as it used to claim before adjustment) | |
616 | * header points to the first 8 bytes of the udp header. We need | |
617 | * to find the appropriate port. | |
618 | */ | |
619 | ||
645ca708 | 620 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) |
db8dac20 DM |
621 | { |
622 | struct inet_sock *inet; | |
b71d1d42 | 623 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
c482c568 | 624 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); |
db8dac20 DM |
625 | const int type = icmp_hdr(skb)->type; |
626 | const int code = icmp_hdr(skb)->code; | |
627 | struct sock *sk; | |
628 | int harderr; | |
629 | int err; | |
fd54d716 | 630 | struct net *net = dev_net(skb->dev); |
db8dac20 | 631 | |
fd54d716 | 632 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
db8dac20 DM |
633 | iph->saddr, uh->source, skb->dev->ifindex, udptable); |
634 | if (sk == NULL) { | |
dcfc23ca | 635 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
db8dac20 DM |
636 | return; /* No socket for error */ |
637 | } | |
638 | ||
639 | err = 0; | |
640 | harderr = 0; | |
641 | inet = inet_sk(sk); | |
642 | ||
643 | switch (type) { | |
644 | default: | |
645 | case ICMP_TIME_EXCEEDED: | |
646 | err = EHOSTUNREACH; | |
647 | break; | |
648 | case ICMP_SOURCE_QUENCH: | |
649 | goto out; | |
650 | case ICMP_PARAMETERPROB: | |
651 | err = EPROTO; | |
652 | harderr = 1; | |
653 | break; | |
654 | case ICMP_DEST_UNREACH: | |
655 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
36393395 | 656 | ipv4_sk_update_pmtu(skb, sk, info); |
db8dac20 DM |
657 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { |
658 | err = EMSGSIZE; | |
659 | harderr = 1; | |
660 | break; | |
661 | } | |
662 | goto out; | |
663 | } | |
664 | err = EHOSTUNREACH; | |
665 | if (code <= NR_ICMP_UNREACH) { | |
666 | harderr = icmp_err_convert[code].fatal; | |
667 | err = icmp_err_convert[code].errno; | |
668 | } | |
669 | break; | |
55be7a9c DM |
670 | case ICMP_REDIRECT: |
671 | ipv4_sk_redirect(skb, sk); | |
672 | break; | |
db8dac20 DM |
673 | } |
674 | ||
675 | /* | |
676 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
677 | * 4.1.3.3. | |
678 | */ | |
679 | if (!inet->recverr) { | |
680 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
681 | goto out; | |
b1faf566 | 682 | } else |
c482c568 | 683 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
b1faf566 | 684 | |
db8dac20 DM |
685 | sk->sk_err = err; |
686 | sk->sk_error_report(sk); | |
687 | out: | |
688 | sock_put(sk); | |
689 | } | |
690 | ||
691 | void udp_err(struct sk_buff *skb, u32 info) | |
692 | { | |
645ca708 | 693 | __udp4_lib_err(skb, info, &udp_table); |
db8dac20 DM |
694 | } |
695 | ||
696 | /* | |
697 | * Throw away all pending data and cancel the corking. Socket is locked. | |
698 | */ | |
36d926b9 | 699 | void udp_flush_pending_frames(struct sock *sk) |
db8dac20 DM |
700 | { |
701 | struct udp_sock *up = udp_sk(sk); | |
702 | ||
703 | if (up->pending) { | |
704 | up->len = 0; | |
705 | up->pending = 0; | |
706 | ip_flush_pending_frames(sk); | |
707 | } | |
708 | } | |
36d926b9 | 709 | EXPORT_SYMBOL(udp_flush_pending_frames); |
db8dac20 DM |
710 | |
711 | /** | |
f6b9664f | 712 | * udp4_hwcsum - handle outgoing HW checksumming |
db8dac20 DM |
713 | * @skb: sk_buff containing the filled-in UDP header |
714 | * (checksum field must be zeroed out) | |
f6b9664f HX |
715 | * @src: source IP address |
716 | * @dst: destination IP address | |
db8dac20 | 717 | */ |
f6b9664f | 718 | static void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst) |
db8dac20 | 719 | { |
db8dac20 | 720 | struct udphdr *uh = udp_hdr(skb); |
f6b9664f HX |
721 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
722 | int offset = skb_transport_offset(skb); | |
723 | int len = skb->len - offset; | |
724 | int hlen = len; | |
db8dac20 DM |
725 | __wsum csum = 0; |
726 | ||
f6b9664f | 727 | if (!frags) { |
db8dac20 DM |
728 | /* |
729 | * Only one fragment on the socket. | |
730 | */ | |
731 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
732 | skb->csum_offset = offsetof(struct udphdr, check); | |
f6b9664f HX |
733 | uh->check = ~csum_tcpudp_magic(src, dst, len, |
734 | IPPROTO_UDP, 0); | |
db8dac20 DM |
735 | } else { |
736 | /* | |
737 | * HW-checksum won't work as there are two or more | |
738 | * fragments on the socket so that all csums of sk_buffs | |
739 | * should be together | |
740 | */ | |
f6b9664f HX |
741 | do { |
742 | csum = csum_add(csum, frags->csum); | |
743 | hlen -= frags->len; | |
744 | } while ((frags = frags->next)); | |
db8dac20 | 745 | |
f6b9664f | 746 | csum = skb_checksum(skb, offset, hlen, csum); |
db8dac20 DM |
747 | skb->ip_summed = CHECKSUM_NONE; |
748 | ||
db8dac20 DM |
749 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); |
750 | if (uh->check == 0) | |
751 | uh->check = CSUM_MANGLED_0; | |
752 | } | |
753 | } | |
754 | ||
79ab0531 | 755 | static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4) |
db8dac20 | 756 | { |
f6b9664f | 757 | struct sock *sk = skb->sk; |
db8dac20 | 758 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
759 | struct udphdr *uh; |
760 | int err = 0; | |
761 | int is_udplite = IS_UDPLITE(sk); | |
f6b9664f HX |
762 | int offset = skb_transport_offset(skb); |
763 | int len = skb->len - offset; | |
db8dac20 DM |
764 | __wsum csum = 0; |
765 | ||
db8dac20 DM |
766 | /* |
767 | * Create a UDP header | |
768 | */ | |
769 | uh = udp_hdr(skb); | |
f6b9664f | 770 | uh->source = inet->inet_sport; |
79ab0531 | 771 | uh->dest = fl4->fl4_dport; |
f6b9664f | 772 | uh->len = htons(len); |
db8dac20 DM |
773 | uh->check = 0; |
774 | ||
775 | if (is_udplite) /* UDP-Lite */ | |
f6b9664f | 776 | csum = udplite_csum(skb); |
db8dac20 | 777 | |
69ddef7b | 778 | else if (sk->sk_no_check == UDP_CSUM_NOXMIT && !skb_has_frags(skb)) { /* UDP csum off */ |
db8dac20 DM |
779 | |
780 | skb->ip_summed = CHECKSUM_NONE; | |
781 | goto send; | |
782 | ||
783 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
784 | ||
79ab0531 | 785 | udp4_hwcsum(skb, fl4->saddr, fl4->daddr); |
db8dac20 DM |
786 | goto send; |
787 | ||
f6b9664f HX |
788 | } else |
789 | csum = udp_csum(skb); | |
db8dac20 DM |
790 | |
791 | /* add protocol-dependent pseudo-header */ | |
79ab0531 | 792 | uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len, |
c482c568 | 793 | sk->sk_protocol, csum); |
db8dac20 DM |
794 | if (uh->check == 0) |
795 | uh->check = CSUM_MANGLED_0; | |
796 | ||
797 | send: | |
b5ec8eea | 798 | err = ip_send_skb(sock_net(sk), skb); |
6ce9e7b5 ED |
799 | if (err) { |
800 | if (err == -ENOBUFS && !inet->recverr) { | |
801 | UDP_INC_STATS_USER(sock_net(sk), | |
802 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
803 | err = 0; | |
804 | } | |
805 | } else | |
806 | UDP_INC_STATS_USER(sock_net(sk), | |
807 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
f6b9664f HX |
808 | return err; |
809 | } | |
810 | ||
811 | /* | |
812 | * Push out all pending data as one UDP datagram. Socket is locked. | |
813 | */ | |
07243c3d | 814 | int udp_push_pending_frames(struct sock *sk) |
f6b9664f HX |
815 | { |
816 | struct udp_sock *up = udp_sk(sk); | |
817 | struct inet_sock *inet = inet_sk(sk); | |
b6f21b26 | 818 | struct flowi4 *fl4 = &inet->cork.fl.u.ip4; |
f6b9664f HX |
819 | struct sk_buff *skb; |
820 | int err = 0; | |
821 | ||
77968b78 | 822 | skb = ip_finish_skb(sk, fl4); |
f6b9664f HX |
823 | if (!skb) |
824 | goto out; | |
825 | ||
79ab0531 | 826 | err = udp_send_skb(skb, fl4); |
f6b9664f | 827 | |
db8dac20 DM |
828 | out: |
829 | up->len = 0; | |
830 | up->pending = 0; | |
db8dac20 DM |
831 | return err; |
832 | } | |
07243c3d | 833 | EXPORT_SYMBOL(udp_push_pending_frames); |
db8dac20 | 834 | |
6fa3eb70 S |
835 | #ifdef UDP_SKT_WIFI |
836 | void udp_event_trace_printk(const char * fmt, int pid, __u16 port) | |
837 | { | |
838 | ||
839 | #ifdef CONFIG_TRACING | |
840 | if(unlikely(0 == udp_tracing_mark_write_addr)) { | |
841 | udp_tracing_mark_write_addr = kallsyms_lookup_name("tracing_mark_write"); | |
842 | } | |
843 | event_trace_printk(udp_tracing_mark_write_addr, fmt, pid, MET_SOCKET_LATENCY_NAME, ntohs(port)); | |
844 | #endif | |
845 | } | |
846 | EXPORT_SYMBOL(udp_event_trace_printk); | |
847 | #endif | |
848 | ||
db8dac20 DM |
849 | int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, |
850 | size_t len) | |
851 | { | |
852 | struct inet_sock *inet = inet_sk(sk); | |
853 | struct udp_sock *up = udp_sk(sk); | |
e474995f | 854 | struct flowi4 fl4_stack; |
b6f21b26 | 855 | struct flowi4 *fl4; |
db8dac20 DM |
856 | int ulen = len; |
857 | struct ipcm_cookie ipc; | |
858 | struct rtable *rt = NULL; | |
859 | int free = 0; | |
860 | int connected = 0; | |
861 | __be32 daddr, faddr, saddr; | |
862 | __be16 dport; | |
863 | u8 tos; | |
864 | int err, is_udplite = IS_UDPLITE(sk); | |
865 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; | |
866 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); | |
903ab86d | 867 | struct sk_buff *skb; |
f6d8bd05 | 868 | struct ip_options_data opt_copy; |
db8dac20 DM |
869 | |
870 | if (len > 0xFFFF) | |
871 | return -EMSGSIZE; | |
872 | ||
873 | /* | |
874 | * Check the flags. | |
875 | */ | |
876 | ||
c482c568 | 877 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
db8dac20 DM |
878 | return -EOPNOTSUPP; |
879 | ||
880 | ipc.opt = NULL; | |
2244d07b | 881 | ipc.tx_flags = 0; |
db8dac20 | 882 | |
903ab86d HX |
883 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
884 | ||
f5fca608 | 885 | fl4 = &inet->cork.fl.u.ip4; |
db8dac20 DM |
886 | if (up->pending) { |
887 | /* | |
888 | * There are pending frames. | |
889 | * The socket lock must be held while it's corked. | |
890 | */ | |
891 | lock_sock(sk); | |
892 | if (likely(up->pending)) { | |
893 | if (unlikely(up->pending != AF_INET)) { | |
894 | release_sock(sk); | |
895 | return -EINVAL; | |
896 | } | |
897 | goto do_append_data; | |
898 | } | |
899 | release_sock(sk); | |
900 | } | |
901 | ulen += sizeof(struct udphdr); | |
902 | ||
903 | /* | |
904 | * Get and verify the address. | |
905 | */ | |
906 | if (msg->msg_name) { | |
5e73ea1a | 907 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; |
db8dac20 DM |
908 | if (msg->msg_namelen < sizeof(*usin)) |
909 | return -EINVAL; | |
910 | if (usin->sin_family != AF_INET) { | |
911 | if (usin->sin_family != AF_UNSPEC) | |
912 | return -EAFNOSUPPORT; | |
913 | } | |
914 | ||
915 | daddr = usin->sin_addr.s_addr; | |
916 | dport = usin->sin_port; | |
917 | if (dport == 0) | |
918 | return -EINVAL; | |
919 | } else { | |
920 | if (sk->sk_state != TCP_ESTABLISHED) | |
921 | return -EDESTADDRREQ; | |
c720c7e8 ED |
922 | daddr = inet->inet_daddr; |
923 | dport = inet->inet_dport; | |
db8dac20 DM |
924 | /* Open fast path for connected socket. |
925 | Route will not be used, if at least one option is set. | |
926 | */ | |
927 | connected = 1; | |
928 | } | |
c720c7e8 | 929 | ipc.addr = inet->inet_saddr; |
db8dac20 DM |
930 | |
931 | ipc.oif = sk->sk_bound_dev_if; | |
bf84a010 | 932 | |
6fa3eb70 S |
933 | #ifdef UDP_SKT_WIFI |
934 | ||
935 | if (unlikely((sysctl_met_is_enable == 1) && (sysctl_udp_met_port > 0))) { | |
936 | ||
937 | if ((ntohs(inet->inet_sport) == sysctl_udp_met_port) && (len >= 4)) { | |
938 | __u16 * seq_id = (__u16 *)((char *)msg->msg_iov->iov_base + 2); | |
939 | udp_event_trace_printk("S|%d|%s|%d\n", current->pid, *seq_id); | |
940 | ||
941 | } | |
942 | } | |
943 | #endif | |
944 | ||
945 | ||
bf84a010 DB |
946 | sock_tx_timestamp(sk, &ipc.tx_flags); |
947 | ||
db8dac20 | 948 | if (msg->msg_controllen) { |
3b1e0a65 | 949 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); |
db8dac20 DM |
950 | if (err) |
951 | return err; | |
952 | if (ipc.opt) | |
953 | free = 1; | |
954 | connected = 0; | |
955 | } | |
f6d8bd05 ED |
956 | if (!ipc.opt) { |
957 | struct ip_options_rcu *inet_opt; | |
958 | ||
959 | rcu_read_lock(); | |
960 | inet_opt = rcu_dereference(inet->inet_opt); | |
961 | if (inet_opt) { | |
962 | memcpy(&opt_copy, inet_opt, | |
963 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
964 | ipc.opt = &opt_copy.opt; | |
965 | } | |
966 | rcu_read_unlock(); | |
967 | } | |
db8dac20 DM |
968 | |
969 | saddr = ipc.addr; | |
970 | ipc.addr = faddr = daddr; | |
971 | ||
f6d8bd05 | 972 | if (ipc.opt && ipc.opt->opt.srr) { |
db8dac20 DM |
973 | if (!daddr) |
974 | return -EINVAL; | |
f6d8bd05 | 975 | faddr = ipc.opt->opt.faddr; |
db8dac20 DM |
976 | connected = 0; |
977 | } | |
978 | tos = RT_TOS(inet->tos); | |
979 | if (sock_flag(sk, SOCK_LOCALROUTE) || | |
980 | (msg->msg_flags & MSG_DONTROUTE) || | |
f6d8bd05 | 981 | (ipc.opt && ipc.opt->opt.is_strictroute)) { |
db8dac20 DM |
982 | tos |= RTO_ONLINK; |
983 | connected = 0; | |
984 | } | |
985 | ||
986 | if (ipv4_is_multicast(daddr)) { | |
987 | if (!ipc.oif) | |
988 | ipc.oif = inet->mc_index; | |
989 | if (!saddr) | |
990 | saddr = inet->mc_addr; | |
991 | connected = 0; | |
76e21053 EH |
992 | } else if (!ipc.oif) |
993 | ipc.oif = inet->uc_index; | |
db8dac20 DM |
994 | |
995 | if (connected) | |
c482c568 | 996 | rt = (struct rtable *)sk_dst_check(sk, 0); |
db8dac20 DM |
997 | |
998 | if (rt == NULL) { | |
84a3aa00 PE |
999 | struct net *net = sock_net(sk); |
1000 | ||
e474995f DM |
1001 | fl4 = &fl4_stack; |
1002 | flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos, | |
c0951cbc DM |
1003 | RT_SCOPE_UNIVERSE, sk->sk_protocol, |
1004 | inet_sk_flowi_flags(sk)|FLOWI_FLAG_CAN_SLEEP, | |
6fa3eb70 S |
1005 | faddr, saddr, dport, inet->inet_sport, |
1006 | sock_i_uid(sk)); | |
c0951cbc | 1007 | |
e474995f DM |
1008 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
1009 | rt = ip_route_output_flow(net, fl4, sk); | |
b23dd4fe DM |
1010 | if (IS_ERR(rt)) { |
1011 | err = PTR_ERR(rt); | |
06dc94b1 | 1012 | rt = NULL; |
db8dac20 | 1013 | if (err == -ENETUNREACH) |
7be560d6 | 1014 | IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES); |
db8dac20 DM |
1015 | goto out; |
1016 | } | |
1017 | ||
1018 | err = -EACCES; | |
1019 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
1020 | !sock_flag(sk, SOCK_BROADCAST)) | |
1021 | goto out; | |
1022 | if (connected) | |
d8d1f30b | 1023 | sk_dst_set(sk, dst_clone(&rt->dst)); |
db8dac20 DM |
1024 | } |
1025 | ||
1026 | if (msg->msg_flags&MSG_CONFIRM) | |
1027 | goto do_confirm; | |
1028 | back_from_confirm: | |
1029 | ||
e474995f | 1030 | saddr = fl4->saddr; |
db8dac20 | 1031 | if (!ipc.addr) |
e474995f | 1032 | daddr = ipc.addr = fl4->daddr; |
db8dac20 | 1033 | |
903ab86d HX |
1034 | /* Lockless fast path for the non-corking case. */ |
1035 | if (!corkreq) { | |
77968b78 | 1036 | skb = ip_make_skb(sk, fl4, getfrag, msg->msg_iov, ulen, |
903ab86d HX |
1037 | sizeof(struct udphdr), &ipc, &rt, |
1038 | msg->msg_flags); | |
1039 | err = PTR_ERR(skb); | |
50c3a487 | 1040 | if (!IS_ERR_OR_NULL(skb)) |
79ab0531 | 1041 | err = udp_send_skb(skb, fl4); |
903ab86d HX |
1042 | goto out; |
1043 | } | |
1044 | ||
db8dac20 DM |
1045 | lock_sock(sk); |
1046 | if (unlikely(up->pending)) { | |
1047 | /* The socket is already corked while preparing it. */ | |
1048 | /* ... which is an evident application bug. --ANK */ | |
1049 | release_sock(sk); | |
1050 | ||
afd46503 | 1051 | LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("cork app bug 2\n")); |
db8dac20 DM |
1052 | err = -EINVAL; |
1053 | goto out; | |
1054 | } | |
1055 | /* | |
1056 | * Now cork the socket to pend data. | |
1057 | */ | |
b6f21b26 DM |
1058 | fl4 = &inet->cork.fl.u.ip4; |
1059 | fl4->daddr = daddr; | |
1060 | fl4->saddr = saddr; | |
9cce96df DM |
1061 | fl4->fl4_dport = dport; |
1062 | fl4->fl4_sport = inet->inet_sport; | |
db8dac20 DM |
1063 | up->pending = AF_INET; |
1064 | ||
1065 | do_append_data: | |
1066 | up->len += ulen; | |
f5fca608 DM |
1067 | err = ip_append_data(sk, fl4, getfrag, msg->msg_iov, ulen, |
1068 | sizeof(struct udphdr), &ipc, &rt, | |
1069 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); | |
db8dac20 DM |
1070 | if (err) |
1071 | udp_flush_pending_frames(sk); | |
1072 | else if (!corkreq) | |
1073 | err = udp_push_pending_frames(sk); | |
1074 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) | |
1075 | up->pending = 0; | |
1076 | release_sock(sk); | |
1077 | ||
1078 | out: | |
1079 | ip_rt_put(rt); | |
1080 | if (free) | |
1081 | kfree(ipc.opt); | |
1082 | if (!err) | |
1083 | return len; | |
1084 | /* | |
1085 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1086 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1087 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1088 | * things). We could add another new stat but at least for now that | |
1089 | * seems like overkill. | |
1090 | */ | |
6fa3eb70 S |
1091 | /* MTK_NET */ |
1092 | if (err == -ENOBUFS || (sk->sk_socket && test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) ) { | |
629ca23c PE |
1093 | UDP_INC_STATS_USER(sock_net(sk), |
1094 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
db8dac20 DM |
1095 | } |
1096 | return err; | |
1097 | ||
1098 | do_confirm: | |
d8d1f30b | 1099 | dst_confirm(&rt->dst); |
db8dac20 DM |
1100 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1101 | goto back_from_confirm; | |
1102 | err = 0; | |
1103 | goto out; | |
1104 | } | |
c482c568 | 1105 | EXPORT_SYMBOL(udp_sendmsg); |
db8dac20 DM |
1106 | |
1107 | int udp_sendpage(struct sock *sk, struct page *page, int offset, | |
1108 | size_t size, int flags) | |
1109 | { | |
f5fca608 | 1110 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
1111 | struct udp_sock *up = udp_sk(sk); |
1112 | int ret; | |
1113 | ||
86a24344 SL |
1114 | if (flags & MSG_SENDPAGE_NOTLAST) |
1115 | flags |= MSG_MORE; | |
1116 | ||
db8dac20 DM |
1117 | if (!up->pending) { |
1118 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; | |
1119 | ||
1120 | /* Call udp_sendmsg to specify destination address which | |
1121 | * sendpage interface can't pass. | |
1122 | * This will succeed only when the socket is connected. | |
1123 | */ | |
1124 | ret = udp_sendmsg(NULL, sk, &msg, 0); | |
1125 | if (ret < 0) | |
1126 | return ret; | |
1127 | } | |
1128 | ||
1129 | lock_sock(sk); | |
1130 | ||
1131 | if (unlikely(!up->pending)) { | |
1132 | release_sock(sk); | |
1133 | ||
afd46503 | 1134 | LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("udp cork app bug 3\n")); |
db8dac20 DM |
1135 | return -EINVAL; |
1136 | } | |
1137 | ||
f5fca608 DM |
1138 | ret = ip_append_page(sk, &inet->cork.fl.u.ip4, |
1139 | page, offset, size, flags); | |
db8dac20 DM |
1140 | if (ret == -EOPNOTSUPP) { |
1141 | release_sock(sk); | |
1142 | return sock_no_sendpage(sk->sk_socket, page, offset, | |
1143 | size, flags); | |
1144 | } | |
1145 | if (ret < 0) { | |
1146 | udp_flush_pending_frames(sk); | |
1147 | goto out; | |
1148 | } | |
1149 | ||
1150 | up->len += size; | |
1151 | if (!(up->corkflag || (flags&MSG_MORE))) | |
1152 | ret = udp_push_pending_frames(sk); | |
1153 | if (!ret) | |
1154 | ret = size; | |
1155 | out: | |
1156 | release_sock(sk); | |
1157 | return ret; | |
1158 | } | |
1159 | ||
85584672 ED |
1160 | |
1161 | /** | |
1162 | * first_packet_length - return length of first packet in receive queue | |
1163 | * @sk: socket | |
1164 | * | |
1165 | * Drops all bad checksum frames, until a valid one is found. | |
1166 | * Returns the length of found skb, or 0 if none is found. | |
1167 | */ | |
1168 | static unsigned int first_packet_length(struct sock *sk) | |
1169 | { | |
1170 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; | |
1171 | struct sk_buff *skb; | |
1172 | unsigned int res; | |
1173 | ||
1174 | __skb_queue_head_init(&list_kill); | |
1175 | ||
1176 | spin_lock_bh(&rcvq->lock); | |
1177 | while ((skb = skb_peek(rcvq)) != NULL && | |
1178 | udp_lib_checksum_complete(skb)) { | |
6a5dc9e5 ED |
1179 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, |
1180 | IS_UDPLITE(sk)); | |
85584672 ED |
1181 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, |
1182 | IS_UDPLITE(sk)); | |
8edf19c2 | 1183 | atomic_inc(&sk->sk_drops); |
85584672 ED |
1184 | __skb_unlink(skb, rcvq); |
1185 | __skb_queue_tail(&list_kill, skb); | |
1186 | } | |
1187 | res = skb ? skb->len : 0; | |
1188 | spin_unlock_bh(&rcvq->lock); | |
1189 | ||
1190 | if (!skb_queue_empty(&list_kill)) { | |
8a74ad60 ED |
1191 | bool slow = lock_sock_fast(sk); |
1192 | ||
85584672 ED |
1193 | __skb_queue_purge(&list_kill); |
1194 | sk_mem_reclaim_partial(sk); | |
8a74ad60 | 1195 | unlock_sock_fast(sk, slow); |
85584672 ED |
1196 | } |
1197 | return res; | |
1198 | } | |
1199 | ||
1da177e4 LT |
1200 | /* |
1201 | * IOCTL requests applicable to the UDP protocol | |
1202 | */ | |
e905a9ed | 1203 | |
1da177e4 LT |
1204 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1205 | { | |
6516c655 SH |
1206 | switch (cmd) { |
1207 | case SIOCOUTQ: | |
1da177e4 | 1208 | { |
31e6d363 ED |
1209 | int amount = sk_wmem_alloc_get(sk); |
1210 | ||
6516c655 SH |
1211 | return put_user(amount, (int __user *)arg); |
1212 | } | |
1da177e4 | 1213 | |
6516c655 SH |
1214 | case SIOCINQ: |
1215 | { | |
85584672 | 1216 | unsigned int amount = first_packet_length(sk); |
6516c655 | 1217 | |
85584672 | 1218 | if (amount) |
6516c655 SH |
1219 | /* |
1220 | * We will only return the amount | |
1221 | * of this packet since that is all | |
1222 | * that will be read. | |
1223 | */ | |
85584672 ED |
1224 | amount -= sizeof(struct udphdr); |
1225 | ||
6516c655 SH |
1226 | return put_user(amount, (int __user *)arg); |
1227 | } | |
1da177e4 | 1228 | |
6516c655 SH |
1229 | default: |
1230 | return -ENOIOCTLCMD; | |
1da177e4 | 1231 | } |
6516c655 SH |
1232 | |
1233 | return 0; | |
1da177e4 | 1234 | } |
c482c568 | 1235 | EXPORT_SYMBOL(udp_ioctl); |
1da177e4 | 1236 | |
db8dac20 DM |
1237 | /* |
1238 | * This should be easy, if there is something there we | |
1239 | * return it, otherwise we block. | |
1240 | */ | |
1241 | ||
1242 | int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
1243 | size_t len, int noblock, int flags, int *addr_len) | |
1244 | { | |
1245 | struct inet_sock *inet = inet_sk(sk); | |
1246 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
1247 | struct sk_buff *skb; | |
59c2cdae | 1248 | unsigned int ulen, copied; |
3f518bf7 | 1249 | int peeked, off = 0; |
db8dac20 DM |
1250 | int err; |
1251 | int is_udplite = IS_UDPLITE(sk); | |
4b9e9796 | 1252 | bool checksum_valid = false; |
8a74ad60 | 1253 | bool slow; |
db8dac20 | 1254 | |
db8dac20 | 1255 | if (flags & MSG_ERRQUEUE) |
08c62a10 | 1256 | return ip_recv_error(sk, msg, len, addr_len); |
db8dac20 DM |
1257 | |
1258 | try_again: | |
1259 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), | |
3f518bf7 | 1260 | &peeked, &off, &err); |
db8dac20 DM |
1261 | if (!skb) |
1262 | goto out; | |
1263 | ||
1264 | ulen = skb->len - sizeof(struct udphdr); | |
59c2cdae DM |
1265 | copied = len; |
1266 | if (copied > ulen) | |
1267 | copied = ulen; | |
1268 | else if (copied < ulen) | |
db8dac20 DM |
1269 | msg->msg_flags |= MSG_TRUNC; |
1270 | ||
1271 | /* | |
1272 | * If checksum is needed at all, try to do it while copying the | |
1273 | * data. If the data is truncated, or if we only want a partial | |
1274 | * coverage checksum (UDP-Lite), do it before the copy. | |
1275 | */ | |
1276 | ||
59c2cdae | 1277 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
4b9e9796 S |
1278 | checksum_valid = !udp_lib_checksum_complete(skb); |
1279 | if (!checksum_valid) | |
db8dac20 DM |
1280 | goto csum_copy_err; |
1281 | } | |
1282 | ||
4b9e9796 | 1283 | if (checksum_valid || skb_csum_unnecessary(skb)) |
db8dac20 | 1284 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
59c2cdae | 1285 | msg->msg_iov, copied); |
db8dac20 | 1286 | else { |
c482c568 ED |
1287 | err = skb_copy_and_csum_datagram_iovec(skb, |
1288 | sizeof(struct udphdr), | |
1289 | msg->msg_iov); | |
db8dac20 DM |
1290 | |
1291 | if (err == -EINVAL) | |
1292 | goto csum_copy_err; | |
1293 | } | |
1294 | ||
22911fc5 ED |
1295 | if (unlikely(err)) { |
1296 | trace_kfree_skb(skb, udp_recvmsg); | |
979402b1 ED |
1297 | if (!peeked) { |
1298 | atomic_inc(&sk->sk_drops); | |
1299 | UDP_INC_STATS_USER(sock_net(sk), | |
1300 | UDP_MIB_INERRORS, is_udplite); | |
1301 | } | |
db8dac20 | 1302 | goto out_free; |
22911fc5 | 1303 | } |
db8dac20 DM |
1304 | |
1305 | if (!peeked) | |
629ca23c PE |
1306 | UDP_INC_STATS_USER(sock_net(sk), |
1307 | UDP_MIB_INDATAGRAMS, is_udplite); | |
db8dac20 | 1308 | |
3b885787 | 1309 | sock_recv_ts_and_drops(msg, sk, skb); |
db8dac20 DM |
1310 | |
1311 | /* Copy the address. */ | |
c482c568 | 1312 | if (sin) { |
db8dac20 DM |
1313 | sin->sin_family = AF_INET; |
1314 | sin->sin_port = udp_hdr(skb)->source; | |
1315 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
1316 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
a2214488 | 1317 | *addr_len = sizeof(*sin); |
db8dac20 DM |
1318 | } |
1319 | if (inet->cmsg_flags) | |
1320 | ip_cmsg_recv(msg, skb); | |
1321 | ||
59c2cdae | 1322 | err = copied; |
db8dac20 DM |
1323 | if (flags & MSG_TRUNC) |
1324 | err = ulen; | |
1325 | ||
1326 | out_free: | |
9d410c79 | 1327 | skb_free_datagram_locked(sk, skb); |
db8dac20 DM |
1328 | out: |
1329 | return err; | |
1330 | ||
1331 | csum_copy_err: | |
8a74ad60 | 1332 | slow = lock_sock_fast(sk); |
6a5dc9e5 ED |
1333 | if (!skb_kill_datagram(sk, skb, flags)) { |
1334 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
629ca23c | 1335 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
6a5dc9e5 | 1336 | } |
8a74ad60 | 1337 | unlock_sock_fast(sk, slow); |
db8dac20 | 1338 | |
4b9e9796 S |
1339 | /* starting over for a new packet, but check if we need to yield */ |
1340 | cond_resched(); | |
9cfaa8de | 1341 | msg->msg_flags &= ~MSG_TRUNC; |
db8dac20 DM |
1342 | goto try_again; |
1343 | } | |
1344 | ||
1345 | ||
1da177e4 LT |
1346 | int udp_disconnect(struct sock *sk, int flags) |
1347 | { | |
1348 | struct inet_sock *inet = inet_sk(sk); | |
1349 | /* | |
1350 | * 1003.1g - break association. | |
1351 | */ | |
e905a9ed | 1352 | |
1da177e4 | 1353 | sk->sk_state = TCP_CLOSE; |
c720c7e8 ED |
1354 | inet->inet_daddr = 0; |
1355 | inet->inet_dport = 0; | |
bdeab991 | 1356 | sock_rps_reset_rxhash(sk); |
1da177e4 LT |
1357 | sk->sk_bound_dev_if = 0; |
1358 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
1359 | inet_reset_saddr(sk); | |
1360 | ||
1361 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { | |
1362 | sk->sk_prot->unhash(sk); | |
c720c7e8 | 1363 | inet->inet_sport = 0; |
1da177e4 LT |
1364 | } |
1365 | sk_dst_reset(sk); | |
1366 | return 0; | |
1367 | } | |
c482c568 | 1368 | EXPORT_SYMBOL(udp_disconnect); |
1da177e4 | 1369 | |
645ca708 ED |
1370 | void udp_lib_unhash(struct sock *sk) |
1371 | { | |
723b4610 ED |
1372 | if (sk_hashed(sk)) { |
1373 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
512615b6 ED |
1374 | struct udp_hslot *hslot, *hslot2; |
1375 | ||
1376 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1377 | udp_sk(sk)->udp_port_hash); | |
1378 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
645ca708 | 1379 | |
723b4610 ED |
1380 | spin_lock_bh(&hslot->lock); |
1381 | if (sk_nulls_del_node_init_rcu(sk)) { | |
fdcc8aa9 | 1382 | hslot->count--; |
c720c7e8 | 1383 | inet_sk(sk)->inet_num = 0; |
723b4610 | 1384 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
512615b6 ED |
1385 | |
1386 | spin_lock(&hslot2->lock); | |
1387 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); | |
1388 | hslot2->count--; | |
1389 | spin_unlock(&hslot2->lock); | |
723b4610 ED |
1390 | } |
1391 | spin_unlock_bh(&hslot->lock); | |
645ca708 | 1392 | } |
645ca708 ED |
1393 | } |
1394 | EXPORT_SYMBOL(udp_lib_unhash); | |
1395 | ||
719f8358 ED |
1396 | /* |
1397 | * inet_rcv_saddr was changed, we must rehash secondary hash | |
1398 | */ | |
1399 | void udp_lib_rehash(struct sock *sk, u16 newhash) | |
1400 | { | |
1401 | if (sk_hashed(sk)) { | |
1402 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
1403 | struct udp_hslot *hslot, *hslot2, *nhslot2; | |
1404 | ||
1405 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
1406 | nhslot2 = udp_hashslot2(udptable, newhash); | |
1407 | udp_sk(sk)->udp_portaddr_hash = newhash; | |
1408 | if (hslot2 != nhslot2) { | |
1409 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1410 | udp_sk(sk)->udp_port_hash); | |
1411 | /* we must lock primary chain too */ | |
1412 | spin_lock_bh(&hslot->lock); | |
1413 | ||
1414 | spin_lock(&hslot2->lock); | |
1415 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); | |
1416 | hslot2->count--; | |
1417 | spin_unlock(&hslot2->lock); | |
1418 | ||
1419 | spin_lock(&nhslot2->lock); | |
1420 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, | |
1421 | &nhslot2->head); | |
1422 | nhslot2->count++; | |
1423 | spin_unlock(&nhslot2->lock); | |
1424 | ||
1425 | spin_unlock_bh(&hslot->lock); | |
1426 | } | |
1427 | } | |
1428 | } | |
1429 | EXPORT_SYMBOL(udp_lib_rehash); | |
1430 | ||
1431 | static void udp_v4_rehash(struct sock *sk) | |
1432 | { | |
1433 | u16 new_hash = udp4_portaddr_hash(sock_net(sk), | |
1434 | inet_sk(sk)->inet_rcv_saddr, | |
1435 | inet_sk(sk)->inet_num); | |
1436 | udp_lib_rehash(sk, new_hash); | |
1437 | } | |
1438 | ||
93821778 HX |
1439 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1440 | { | |
fec5e652 | 1441 | int rc; |
766e9037 | 1442 | |
fec5e652 | 1443 | if (inet_sk(sk)->inet_daddr) |
bdeab991 | 1444 | sock_rps_save_rxhash(sk, skb); |
fec5e652 | 1445 | |
d826eb14 | 1446 | rc = sock_queue_rcv_skb(sk, skb); |
766e9037 ED |
1447 | if (rc < 0) { |
1448 | int is_udplite = IS_UDPLITE(sk); | |
93821778 | 1449 | |
93821778 | 1450 | /* Note that an ENOMEM error is charged twice */ |
766e9037 | 1451 | if (rc == -ENOMEM) |
93821778 HX |
1452 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
1453 | is_udplite); | |
766e9037 ED |
1454 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
1455 | kfree_skb(skb); | |
296f7ea7 | 1456 | trace_udp_fail_queue_rcv_skb(rc, sk); |
766e9037 | 1457 | return -1; |
93821778 HX |
1458 | } |
1459 | ||
1460 | return 0; | |
1461 | ||
93821778 HX |
1462 | } |
1463 | ||
447167bf ED |
1464 | static struct static_key udp_encap_needed __read_mostly; |
1465 | void udp_encap_enable(void) | |
1466 | { | |
1467 | if (!static_key_enabled(&udp_encap_needed)) | |
1468 | static_key_slow_inc(&udp_encap_needed); | |
1469 | } | |
1470 | EXPORT_SYMBOL(udp_encap_enable); | |
1471 | ||
db8dac20 DM |
1472 | /* returns: |
1473 | * -1: error | |
1474 | * 0: success | |
1475 | * >0: "udp encap" protocol resubmission | |
1476 | * | |
1477 | * Note that in the success and error cases, the skb is assumed to | |
1478 | * have either been requeued or freed. | |
1479 | */ | |
c482c568 | 1480 | int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
db8dac20 DM |
1481 | { |
1482 | struct udp_sock *up = udp_sk(sk); | |
1483 | int rc; | |
1484 | int is_udplite = IS_UDPLITE(sk); | |
1485 | ||
1486 | /* | |
1487 | * Charge it to the socket, dropping if the queue is full. | |
1488 | */ | |
1489 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1490 | goto drop; | |
1491 | nf_reset(skb); | |
1492 | ||
447167bf | 1493 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
0ad92ad0 ED |
1494 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
1495 | ||
db8dac20 DM |
1496 | /* |
1497 | * This is an encapsulation socket so pass the skb to | |
1498 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
1499 | * fall through and pass this up the UDP socket. | |
1500 | * up->encap_rcv() returns the following value: | |
1501 | * =0 if skb was successfully passed to the encap | |
1502 | * handler or was discarded by it. | |
1503 | * >0 if skb should be passed on to UDP. | |
1504 | * <0 if skb should be resubmitted as proto -N | |
1505 | */ | |
1506 | ||
1507 | /* if we're overly short, let UDP handle it */ | |
0ad92ad0 ED |
1508 | encap_rcv = ACCESS_ONCE(up->encap_rcv); |
1509 | if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { | |
db8dac20 DM |
1510 | int ret; |
1511 | ||
0ad92ad0 | 1512 | ret = encap_rcv(sk, skb); |
db8dac20 | 1513 | if (ret <= 0) { |
0283328e PE |
1514 | UDP_INC_STATS_BH(sock_net(sk), |
1515 | UDP_MIB_INDATAGRAMS, | |
db8dac20 DM |
1516 | is_udplite); |
1517 | return -ret; | |
1518 | } | |
1519 | } | |
1520 | ||
1521 | /* FALLTHROUGH -- it's a UDP Packet */ | |
1522 | } | |
1523 | ||
1524 | /* | |
1525 | * UDP-Lite specific tests, ignored on UDP sockets | |
1526 | */ | |
1527 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { | |
1528 | ||
1529 | /* | |
1530 | * MIB statistics other than incrementing the error count are | |
1531 | * disabled for the following two types of errors: these depend | |
1532 | * on the application settings, not on the functioning of the | |
1533 | * protocol stack as such. | |
1534 | * | |
1535 | * RFC 3828 here recommends (sec 3.3): "There should also be a | |
1536 | * way ... to ... at least let the receiving application block | |
1537 | * delivery of packets with coverage values less than a value | |
1538 | * provided by the application." | |
1539 | */ | |
1540 | if (up->pcrlen == 0) { /* full coverage was set */ | |
afd46503 JP |
1541 | LIMIT_NETDEBUG(KERN_WARNING "UDPLite: partial coverage %d while full coverage %d requested\n", |
1542 | UDP_SKB_CB(skb)->cscov, skb->len); | |
db8dac20 DM |
1543 | goto drop; |
1544 | } | |
1545 | /* The next case involves violating the min. coverage requested | |
1546 | * by the receiver. This is subtle: if receiver wants x and x is | |
1547 | * greater than the buffersize/MTU then receiver will complain | |
1548 | * that it wants x while sender emits packets of smaller size y. | |
1549 | * Therefore the above ...()->partial_cov statement is essential. | |
1550 | */ | |
1551 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
afd46503 JP |
1552 | LIMIT_NETDEBUG(KERN_WARNING "UDPLite: coverage %d too small, need min %d\n", |
1553 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
db8dac20 DM |
1554 | goto drop; |
1555 | } | |
1556 | } | |
1557 | ||
33d480ce ED |
1558 | if (rcu_access_pointer(sk->sk_filter) && |
1559 | udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 1560 | goto csum_error; |
db8dac20 | 1561 | |
c377411f | 1562 | |
f545a38f | 1563 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) |
c377411f ED |
1564 | goto drop; |
1565 | ||
93821778 | 1566 | rc = 0; |
db8dac20 | 1567 | |
d826eb14 | 1568 | ipv4_pktinfo_prepare(skb); |
93821778 HX |
1569 | bh_lock_sock(sk); |
1570 | if (!sock_owned_by_user(sk)) | |
1571 | rc = __udp_queue_rcv_skb(sk, skb); | |
f545a38f | 1572 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
55349790 ZY |
1573 | bh_unlock_sock(sk); |
1574 | goto drop; | |
1575 | } | |
93821778 HX |
1576 | bh_unlock_sock(sk); |
1577 | ||
1578 | return rc; | |
db8dac20 | 1579 | |
6a5dc9e5 ED |
1580 | csum_error: |
1581 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
db8dac20 | 1582 | drop: |
0283328e | 1583 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
8edf19c2 | 1584 | atomic_inc(&sk->sk_drops); |
db8dac20 DM |
1585 | kfree_skb(skb); |
1586 | return -1; | |
1587 | } | |
1588 | ||
1240d137 ED |
1589 | |
1590 | static void flush_stack(struct sock **stack, unsigned int count, | |
1591 | struct sk_buff *skb, unsigned int final) | |
1592 | { | |
1593 | unsigned int i; | |
1594 | struct sk_buff *skb1 = NULL; | |
f6b8f32c | 1595 | struct sock *sk; |
1240d137 ED |
1596 | |
1597 | for (i = 0; i < count; i++) { | |
f6b8f32c | 1598 | sk = stack[i]; |
1240d137 ED |
1599 | if (likely(skb1 == NULL)) |
1600 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); | |
1601 | ||
f6b8f32c ED |
1602 | if (!skb1) { |
1603 | atomic_inc(&sk->sk_drops); | |
1604 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
1605 | IS_UDPLITE(sk)); | |
1606 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
1607 | IS_UDPLITE(sk)); | |
1608 | } | |
1609 | ||
1610 | if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0) | |
1240d137 ED |
1611 | skb1 = NULL; |
1612 | } | |
1613 | if (unlikely(skb1)) | |
1614 | kfree_skb(skb1); | |
1615 | } | |
1616 | ||
db8dac20 DM |
1617 | /* |
1618 | * Multicasts and broadcasts go to each listener. | |
1619 | * | |
1240d137 | 1620 | * Note: called only from the BH handler context. |
db8dac20 | 1621 | */ |
e3163493 | 1622 | static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
db8dac20 DM |
1623 | struct udphdr *uh, |
1624 | __be32 saddr, __be32 daddr, | |
645ca708 | 1625 | struct udp_table *udptable) |
db8dac20 | 1626 | { |
1240d137 | 1627 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
f86dcc5a | 1628 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
db8dac20 | 1629 | int dif; |
1240d137 | 1630 | unsigned int i, count = 0; |
db8dac20 | 1631 | |
645ca708 | 1632 | spin_lock(&hslot->lock); |
88ab1932 | 1633 | sk = sk_nulls_head(&hslot->head); |
db8dac20 | 1634 | dif = skb->dev->ifindex; |
920a4611 | 1635 | sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
1240d137 ED |
1636 | while (sk) { |
1637 | stack[count++] = sk; | |
1638 | sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest, | |
1639 | daddr, uh->source, saddr, dif); | |
1640 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
1641 | if (!sk) | |
1642 | break; | |
1643 | flush_stack(stack, count, skb, ~0); | |
1644 | count = 0; | |
1645 | } | |
1646 | } | |
1647 | /* | |
1648 | * before releasing chain lock, we must take a reference on sockets | |
1649 | */ | |
1650 | for (i = 0; i < count; i++) | |
1651 | sock_hold(stack[i]); | |
1652 | ||
645ca708 | 1653 | spin_unlock(&hslot->lock); |
1240d137 ED |
1654 | |
1655 | /* | |
1656 | * do the slow work with no lock held | |
1657 | */ | |
1658 | if (count) { | |
1659 | flush_stack(stack, count, skb, count - 1); | |
1660 | ||
1661 | for (i = 0; i < count; i++) | |
1662 | sock_put(stack[i]); | |
1663 | } else { | |
1664 | kfree_skb(skb); | |
1665 | } | |
db8dac20 DM |
1666 | return 0; |
1667 | } | |
1668 | ||
1669 | /* Initialize UDP checksum. If exited with zero value (success), | |
1670 | * CHECKSUM_UNNECESSARY means, that no more checks are required. | |
1671 | * Otherwise, csum completion requires chacksumming packet body, | |
1672 | * including udp header and folding it to skb->csum. | |
1673 | */ | |
1674 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, | |
1675 | int proto) | |
1676 | { | |
1677 | const struct iphdr *iph; | |
1678 | int err; | |
1679 | ||
1680 | UDP_SKB_CB(skb)->partial_cov = 0; | |
1681 | UDP_SKB_CB(skb)->cscov = skb->len; | |
1682 | ||
1683 | if (proto == IPPROTO_UDPLITE) { | |
1684 | err = udplite_checksum_init(skb, uh); | |
1685 | if (err) | |
1686 | return err; | |
1687 | } | |
1688 | ||
1689 | iph = ip_hdr(skb); | |
1690 | if (uh->check == 0) { | |
1691 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1692 | } else if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
c482c568 | 1693 | if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, |
db8dac20 DM |
1694 | proto, skb->csum)) |
1695 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1696 | } | |
1697 | if (!skb_csum_unnecessary(skb)) | |
1698 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, | |
1699 | skb->len, proto, 0); | |
1700 | /* Probably, we should checksum udp header (it should be in cache | |
1701 | * in any case) and data in tiny packets (< rx copybreak). | |
1702 | */ | |
1703 | ||
1704 | return 0; | |
1705 | } | |
1706 | ||
1707 | /* | |
1708 | * All we need to do is get the socket, and then do a checksum. | |
1709 | */ | |
1710 | ||
645ca708 | 1711 | int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
db8dac20 DM |
1712 | int proto) |
1713 | { | |
1714 | struct sock *sk; | |
7b5e56f9 | 1715 | struct udphdr *uh; |
db8dac20 | 1716 | unsigned short ulen; |
adf30907 | 1717 | struct rtable *rt = skb_rtable(skb); |
2783ef23 | 1718 | __be32 saddr, daddr; |
0283328e | 1719 | struct net *net = dev_net(skb->dev); |
db8dac20 DM |
1720 | |
1721 | /* | |
1722 | * Validate the packet. | |
1723 | */ | |
1724 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
1725 | goto drop; /* No space for header. */ | |
1726 | ||
7b5e56f9 | 1727 | uh = udp_hdr(skb); |
db8dac20 | 1728 | ulen = ntohs(uh->len); |
ccc2d97c BM |
1729 | saddr = ip_hdr(skb)->saddr; |
1730 | daddr = ip_hdr(skb)->daddr; | |
1731 | ||
db8dac20 DM |
1732 | if (ulen > skb->len) |
1733 | goto short_packet; | |
1734 | ||
1735 | if (proto == IPPROTO_UDP) { | |
1736 | /* UDP validates ulen. */ | |
1737 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) | |
1738 | goto short_packet; | |
1739 | uh = udp_hdr(skb); | |
1740 | } | |
1741 | ||
1742 | if (udp4_csum_init(skb, uh, proto)) | |
1743 | goto csum_error; | |
1744 | ||
1745 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) | |
e3163493 PE |
1746 | return __udp4_lib_mcast_deliver(net, skb, uh, |
1747 | saddr, daddr, udptable); | |
db8dac20 | 1748 | |
607c4aaf | 1749 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
db8dac20 DM |
1750 | |
1751 | if (sk != NULL) { | |
93821778 | 1752 | int ret = udp_queue_rcv_skb(sk, skb); |
db8dac20 DM |
1753 | sock_put(sk); |
1754 | ||
1755 | /* a return value > 0 means to resubmit the input, but | |
1756 | * it wants the return to be -protocol, or 0 | |
1757 | */ | |
1758 | if (ret > 0) | |
1759 | return -ret; | |
1760 | return 0; | |
1761 | } | |
1762 | ||
1763 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1764 | goto drop; | |
1765 | nf_reset(skb); | |
1766 | ||
1767 | /* No socket. Drop packet silently, if checksum is wrong */ | |
1768 | if (udp_lib_checksum_complete(skb)) | |
1769 | goto csum_error; | |
1770 | ||
0283328e | 1771 | UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1772 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1773 | ||
1774 | /* | |
1775 | * Hmm. We got an UDP packet to a port to which we | |
1776 | * don't wanna listen. Ignore it. | |
1777 | */ | |
1778 | kfree_skb(skb); | |
1779 | return 0; | |
1780 | ||
1781 | short_packet: | |
673d57e7 | 1782 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
afd46503 JP |
1783 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
1784 | &saddr, ntohs(uh->source), | |
1785 | ulen, skb->len, | |
1786 | &daddr, ntohs(uh->dest)); | |
db8dac20 DM |
1787 | goto drop; |
1788 | ||
1789 | csum_error: | |
1790 | /* | |
1791 | * RFC1122: OK. Discards the bad packet silently (as far as | |
1792 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). | |
1793 | */ | |
673d57e7 | 1794 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
afd46503 JP |
1795 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
1796 | &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest), | |
db8dac20 | 1797 | ulen); |
6a5dc9e5 | 1798 | UDP_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 | 1799 | drop: |
0283328e | 1800 | UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1801 | kfree_skb(skb); |
1802 | return 0; | |
1803 | } | |
1804 | ||
1805 | int udp_rcv(struct sk_buff *skb) | |
1806 | { | |
645ca708 | 1807 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
db8dac20 DM |
1808 | } |
1809 | ||
7d06b2e0 | 1810 | void udp_destroy_sock(struct sock *sk) |
db8dac20 | 1811 | { |
44046a59 | 1812 | struct udp_sock *up = udp_sk(sk); |
8a74ad60 | 1813 | bool slow = lock_sock_fast(sk); |
db8dac20 | 1814 | udp_flush_pending_frames(sk); |
8a74ad60 | 1815 | unlock_sock_fast(sk, slow); |
44046a59 TP |
1816 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
1817 | void (*encap_destroy)(struct sock *sk); | |
1818 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1819 | if (encap_destroy) | |
1820 | encap_destroy(sk); | |
1821 | } | |
db8dac20 DM |
1822 | } |
1823 | ||
1da177e4 LT |
1824 | /* |
1825 | * Socket option code for UDP | |
1826 | */ | |
4c0a6cb0 | 1827 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1828 | char __user *optval, unsigned int optlen, |
4c0a6cb0 | 1829 | int (*push_pending_frames)(struct sock *)) |
1da177e4 LT |
1830 | { |
1831 | struct udp_sock *up = udp_sk(sk); | |
1832 | int val; | |
1833 | int err = 0; | |
b2bf1e26 | 1834 | int is_udplite = IS_UDPLITE(sk); |
1da177e4 | 1835 | |
c482c568 | 1836 | if (optlen < sizeof(int)) |
1da177e4 LT |
1837 | return -EINVAL; |
1838 | ||
1839 | if (get_user(val, (int __user *)optval)) | |
1840 | return -EFAULT; | |
1841 | ||
6516c655 | 1842 | switch (optname) { |
1da177e4 LT |
1843 | case UDP_CORK: |
1844 | if (val != 0) { | |
1845 | up->corkflag = 1; | |
1846 | } else { | |
1847 | up->corkflag = 0; | |
1848 | lock_sock(sk); | |
4c0a6cb0 | 1849 | (*push_pending_frames)(sk); |
1da177e4 LT |
1850 | release_sock(sk); |
1851 | } | |
1852 | break; | |
e905a9ed | 1853 | |
1da177e4 LT |
1854 | case UDP_ENCAP: |
1855 | switch (val) { | |
1856 | case 0: | |
1857 | case UDP_ENCAP_ESPINUDP: | |
1858 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
067b207b JC |
1859 | up->encap_rcv = xfrm4_udp_encap_rcv; |
1860 | /* FALLTHROUGH */ | |
342f0234 | 1861 | case UDP_ENCAP_L2TPINUDP: |
1da177e4 | 1862 | up->encap_type = val; |
447167bf | 1863 | udp_encap_enable(); |
1da177e4 LT |
1864 | break; |
1865 | default: | |
1866 | err = -ENOPROTOOPT; | |
1867 | break; | |
1868 | } | |
1869 | break; | |
1870 | ||
ba4e58ec GR |
1871 | /* |
1872 | * UDP-Lite's partial checksum coverage (RFC 3828). | |
1873 | */ | |
1874 | /* The sender sets actual checksum coverage length via this option. | |
1875 | * The case coverage > packet length is handled by send module. */ | |
1876 | case UDPLITE_SEND_CSCOV: | |
b2bf1e26 | 1877 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1878 | return -ENOPROTOOPT; |
1879 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ | |
1880 | val = 8; | |
4be929be AD |
1881 | else if (val > USHRT_MAX) |
1882 | val = USHRT_MAX; | |
ba4e58ec GR |
1883 | up->pcslen = val; |
1884 | up->pcflag |= UDPLITE_SEND_CC; | |
1885 | break; | |
1886 | ||
e905a9ed YH |
1887 | /* The receiver specifies a minimum checksum coverage value. To make |
1888 | * sense, this should be set to at least 8 (as done below). If zero is | |
ba4e58ec GR |
1889 | * used, this again means full checksum coverage. */ |
1890 | case UDPLITE_RECV_CSCOV: | |
b2bf1e26 | 1891 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1892 | return -ENOPROTOOPT; |
1893 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ | |
1894 | val = 8; | |
4be929be AD |
1895 | else if (val > USHRT_MAX) |
1896 | val = USHRT_MAX; | |
ba4e58ec GR |
1897 | up->pcrlen = val; |
1898 | up->pcflag |= UDPLITE_RECV_CC; | |
1899 | break; | |
1900 | ||
1da177e4 LT |
1901 | default: |
1902 | err = -ENOPROTOOPT; | |
1903 | break; | |
6516c655 | 1904 | } |
1da177e4 LT |
1905 | |
1906 | return err; | |
1907 | } | |
c482c568 | 1908 | EXPORT_SYMBOL(udp_lib_setsockopt); |
1da177e4 | 1909 | |
db8dac20 | 1910 | int udp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1911 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1912 | { |
1913 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1914 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1915 | udp_push_pending_frames); | |
1916 | return ip_setsockopt(sk, level, optname, optval, optlen); | |
1917 | } | |
1918 | ||
1919 | #ifdef CONFIG_COMPAT | |
1920 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 1921 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1922 | { |
1923 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1924 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1925 | udp_push_pending_frames); | |
1926 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); | |
1927 | } | |
1928 | #endif | |
1929 | ||
4c0a6cb0 GR |
1930 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
1931 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
1932 | { |
1933 | struct udp_sock *up = udp_sk(sk); | |
1934 | int val, len; | |
1935 | ||
c482c568 | 1936 | if (get_user(len, optlen)) |
1da177e4 LT |
1937 | return -EFAULT; |
1938 | ||
1939 | len = min_t(unsigned int, len, sizeof(int)); | |
e905a9ed | 1940 | |
6516c655 | 1941 | if (len < 0) |
1da177e4 LT |
1942 | return -EINVAL; |
1943 | ||
6516c655 | 1944 | switch (optname) { |
1da177e4 LT |
1945 | case UDP_CORK: |
1946 | val = up->corkflag; | |
1947 | break; | |
1948 | ||
1949 | case UDP_ENCAP: | |
1950 | val = up->encap_type; | |
1951 | break; | |
1952 | ||
ba4e58ec GR |
1953 | /* The following two cannot be changed on UDP sockets, the return is |
1954 | * always 0 (which corresponds to the full checksum coverage of UDP). */ | |
1955 | case UDPLITE_SEND_CSCOV: | |
1956 | val = up->pcslen; | |
1957 | break; | |
1958 | ||
1959 | case UDPLITE_RECV_CSCOV: | |
1960 | val = up->pcrlen; | |
1961 | break; | |
1962 | ||
1da177e4 LT |
1963 | default: |
1964 | return -ENOPROTOOPT; | |
6516c655 | 1965 | } |
1da177e4 | 1966 | |
6516c655 | 1967 | if (put_user(len, optlen)) |
e905a9ed | 1968 | return -EFAULT; |
c482c568 | 1969 | if (copy_to_user(optval, &val, len)) |
1da177e4 | 1970 | return -EFAULT; |
e905a9ed | 1971 | return 0; |
1da177e4 | 1972 | } |
c482c568 | 1973 | EXPORT_SYMBOL(udp_lib_getsockopt); |
1da177e4 | 1974 | |
db8dac20 DM |
1975 | int udp_getsockopt(struct sock *sk, int level, int optname, |
1976 | char __user *optval, int __user *optlen) | |
1977 | { | |
1978 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1979 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1980 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
1981 | } | |
1982 | ||
1983 | #ifdef CONFIG_COMPAT | |
1984 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, | |
1985 | char __user *optval, int __user *optlen) | |
1986 | { | |
1987 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1988 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1989 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); | |
1990 | } | |
1991 | #endif | |
1da177e4 LT |
1992 | /** |
1993 | * udp_poll - wait for a UDP event. | |
1994 | * @file - file struct | |
1995 | * @sock - socket | |
1996 | * @wait - poll table | |
1997 | * | |
e905a9ed | 1998 | * This is same as datagram poll, except for the special case of |
1da177e4 LT |
1999 | * blocking sockets. If application is using a blocking fd |
2000 | * and a packet with checksum error is in the queue; | |
2001 | * then it could get return from select indicating data available | |
2002 | * but then block when reading it. Add special case code | |
2003 | * to work around these arguably broken applications. | |
2004 | */ | |
2005 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) | |
2006 | { | |
2007 | unsigned int mask = datagram_poll(file, sock, wait); | |
2008 | struct sock *sk = sock->sk; | |
ba4e58ec | 2009 | |
1da177e4 | 2010 | /* Check for false positives due to checksum errors */ |
85584672 ED |
2011 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
2012 | !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk)) | |
2013 | mask &= ~(POLLIN | POLLRDNORM); | |
1da177e4 LT |
2014 | |
2015 | return mask; | |
e905a9ed | 2016 | |
1da177e4 | 2017 | } |
c482c568 | 2018 | EXPORT_SYMBOL(udp_poll); |
1da177e4 | 2019 | |
db8dac20 DM |
2020 | struct proto udp_prot = { |
2021 | .name = "UDP", | |
2022 | .owner = THIS_MODULE, | |
2023 | .close = udp_lib_close, | |
2024 | .connect = ip4_datagram_connect, | |
2025 | .disconnect = udp_disconnect, | |
2026 | .ioctl = udp_ioctl, | |
2027 | .destroy = udp_destroy_sock, | |
2028 | .setsockopt = udp_setsockopt, | |
2029 | .getsockopt = udp_getsockopt, | |
2030 | .sendmsg = udp_sendmsg, | |
2031 | .recvmsg = udp_recvmsg, | |
2032 | .sendpage = udp_sendpage, | |
93821778 | 2033 | .backlog_rcv = __udp_queue_rcv_skb, |
8141ed9f | 2034 | .release_cb = ip4_datagram_release_cb, |
db8dac20 DM |
2035 | .hash = udp_lib_hash, |
2036 | .unhash = udp_lib_unhash, | |
719f8358 | 2037 | .rehash = udp_v4_rehash, |
db8dac20 DM |
2038 | .get_port = udp_v4_get_port, |
2039 | .memory_allocated = &udp_memory_allocated, | |
2040 | .sysctl_mem = sysctl_udp_mem, | |
2041 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
2042 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
2043 | .obj_size = sizeof(struct udp_sock), | |
271b72c7 | 2044 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 2045 | .h.udp_table = &udp_table, |
db8dac20 DM |
2046 | #ifdef CONFIG_COMPAT |
2047 | .compat_setsockopt = compat_udp_setsockopt, | |
2048 | .compat_getsockopt = compat_udp_getsockopt, | |
2049 | #endif | |
fcbdf09d | 2050 | .clear_sk = sk_prot_clear_portaddr_nulls, |
db8dac20 | 2051 | }; |
c482c568 | 2052 | EXPORT_SYMBOL(udp_prot); |
1da177e4 LT |
2053 | |
2054 | /* ------------------------------------------------------------------------ */ | |
2055 | #ifdef CONFIG_PROC_FS | |
2056 | ||
645ca708 | 2057 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
1da177e4 LT |
2058 | { |
2059 | struct sock *sk; | |
2060 | struct udp_iter_state *state = seq->private; | |
6f191efe | 2061 | struct net *net = seq_file_net(seq); |
1da177e4 | 2062 | |
f86dcc5a ED |
2063 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
2064 | ++state->bucket) { | |
88ab1932 | 2065 | struct hlist_nulls_node *node; |
645ca708 | 2066 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
f86dcc5a ED |
2067 | |
2068 | if (hlist_nulls_empty(&hslot->head)) | |
2069 | continue; | |
2070 | ||
645ca708 | 2071 | spin_lock_bh(&hslot->lock); |
88ab1932 | 2072 | sk_nulls_for_each(sk, node, &hslot->head) { |
878628fb | 2073 | if (!net_eq(sock_net(sk), net)) |
a91275ef | 2074 | continue; |
1da177e4 LT |
2075 | if (sk->sk_family == state->family) |
2076 | goto found; | |
2077 | } | |
645ca708 | 2078 | spin_unlock_bh(&hslot->lock); |
1da177e4 LT |
2079 | } |
2080 | sk = NULL; | |
2081 | found: | |
2082 | return sk; | |
2083 | } | |
2084 | ||
2085 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) | |
2086 | { | |
2087 | struct udp_iter_state *state = seq->private; | |
6f191efe | 2088 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2089 | |
2090 | do { | |
88ab1932 | 2091 | sk = sk_nulls_next(sk); |
878628fb | 2092 | } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); |
1da177e4 | 2093 | |
645ca708 | 2094 | if (!sk) { |
f86dcc5a | 2095 | if (state->bucket <= state->udp_table->mask) |
30842f29 | 2096 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
645ca708 | 2097 | return udp_get_first(seq, state->bucket + 1); |
1da177e4 LT |
2098 | } |
2099 | return sk; | |
2100 | } | |
2101 | ||
2102 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) | |
2103 | { | |
645ca708 | 2104 | struct sock *sk = udp_get_first(seq, 0); |
1da177e4 LT |
2105 | |
2106 | if (sk) | |
6516c655 | 2107 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
1da177e4 LT |
2108 | --pos; |
2109 | return pos ? NULL : sk; | |
2110 | } | |
2111 | ||
2112 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) | |
2113 | { | |
30842f29 | 2114 | struct udp_iter_state *state = seq->private; |
f86dcc5a | 2115 | state->bucket = MAX_UDP_PORTS; |
30842f29 | 2116 | |
b50660f1 | 2117 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
1da177e4 LT |
2118 | } |
2119 | ||
2120 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2121 | { | |
2122 | struct sock *sk; | |
2123 | ||
b50660f1 | 2124 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2125 | sk = udp_get_idx(seq, 0); |
2126 | else | |
2127 | sk = udp_get_next(seq, v); | |
2128 | ||
2129 | ++*pos; | |
2130 | return sk; | |
2131 | } | |
2132 | ||
2133 | static void udp_seq_stop(struct seq_file *seq, void *v) | |
2134 | { | |
645ca708 ED |
2135 | struct udp_iter_state *state = seq->private; |
2136 | ||
f86dcc5a | 2137 | if (state->bucket <= state->udp_table->mask) |
645ca708 | 2138 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
1da177e4 LT |
2139 | } |
2140 | ||
73cb88ec | 2141 | int udp_seq_open(struct inode *inode, struct file *file) |
1da177e4 | 2142 | { |
d9dda78b | 2143 | struct udp_seq_afinfo *afinfo = PDE_DATA(inode); |
a2be75c1 DL |
2144 | struct udp_iter_state *s; |
2145 | int err; | |
a91275ef | 2146 | |
a2be75c1 DL |
2147 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
2148 | sizeof(struct udp_iter_state)); | |
2149 | if (err < 0) | |
2150 | return err; | |
a91275ef | 2151 | |
a2be75c1 | 2152 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 2153 | s->family = afinfo->family; |
645ca708 | 2154 | s->udp_table = afinfo->udp_table; |
a2be75c1 | 2155 | return err; |
a91275ef | 2156 | } |
73cb88ec | 2157 | EXPORT_SYMBOL(udp_seq_open); |
a91275ef | 2158 | |
1da177e4 | 2159 | /* ------------------------------------------------------------------------ */ |
0c96d8c5 | 2160 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 LT |
2161 | { |
2162 | struct proc_dir_entry *p; | |
2163 | int rc = 0; | |
2164 | ||
dda61925 DL |
2165 | afinfo->seq_ops.start = udp_seq_start; |
2166 | afinfo->seq_ops.next = udp_seq_next; | |
2167 | afinfo->seq_ops.stop = udp_seq_stop; | |
2168 | ||
84841c3c | 2169 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
73cb88ec | 2170 | afinfo->seq_fops, afinfo); |
84841c3c | 2171 | if (!p) |
1da177e4 LT |
2172 | rc = -ENOMEM; |
2173 | return rc; | |
2174 | } | |
c482c568 | 2175 | EXPORT_SYMBOL(udp_proc_register); |
1da177e4 | 2176 | |
0c96d8c5 | 2177 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 | 2178 | { |
ece31ffd | 2179 | remove_proc_entry(afinfo->name, net->proc_net); |
1da177e4 | 2180 | } |
c482c568 | 2181 | EXPORT_SYMBOL(udp_proc_unregister); |
db8dac20 DM |
2182 | |
2183 | /* ------------------------------------------------------------------------ */ | |
5e659e4c PE |
2184 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
2185 | int bucket, int *len) | |
db8dac20 DM |
2186 | { |
2187 | struct inet_sock *inet = inet_sk(sp); | |
c720c7e8 ED |
2188 | __be32 dest = inet->inet_daddr; |
2189 | __be32 src = inet->inet_rcv_saddr; | |
2190 | __u16 destp = ntohs(inet->inet_dport); | |
2191 | __u16 srcp = ntohs(inet->inet_sport); | |
db8dac20 | 2192 | |
f86dcc5a | 2193 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
71338aa7 | 2194 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n", |
db8dac20 | 2195 | bucket, src, srcp, dest, destp, sp->sk_state, |
31e6d363 ED |
2196 | sk_wmem_alloc_get(sp), |
2197 | sk_rmem_alloc_get(sp), | |
a7cb5a49 EB |
2198 | 0, 0L, 0, |
2199 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
2200 | 0, sock_i_ino(sp), | |
cb61cb9b ED |
2201 | atomic_read(&sp->sk_refcnt), sp, |
2202 | atomic_read(&sp->sk_drops), len); | |
db8dac20 DM |
2203 | } |
2204 | ||
2205 | int udp4_seq_show(struct seq_file *seq, void *v) | |
2206 | { | |
2207 | if (v == SEQ_START_TOKEN) | |
2208 | seq_printf(seq, "%-127s\n", | |
2209 | " sl local_address rem_address st tx_queue " | |
2210 | "rx_queue tr tm->when retrnsmt uid timeout " | |
cb61cb9b | 2211 | "inode ref pointer drops"); |
db8dac20 | 2212 | else { |
db8dac20 | 2213 | struct udp_iter_state *state = seq->private; |
5e659e4c | 2214 | int len; |
db8dac20 | 2215 | |
5e659e4c | 2216 | udp4_format_sock(v, seq, state->bucket, &len); |
c482c568 | 2217 | seq_printf(seq, "%*s\n", 127 - len, ""); |
db8dac20 DM |
2218 | } |
2219 | return 0; | |
2220 | } | |
2221 | ||
73cb88ec AV |
2222 | static const struct file_operations udp_afinfo_seq_fops = { |
2223 | .owner = THIS_MODULE, | |
2224 | .open = udp_seq_open, | |
2225 | .read = seq_read, | |
2226 | .llseek = seq_lseek, | |
2227 | .release = seq_release_net | |
2228 | }; | |
2229 | ||
db8dac20 | 2230 | /* ------------------------------------------------------------------------ */ |
db8dac20 | 2231 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
db8dac20 DM |
2232 | .name = "udp", |
2233 | .family = AF_INET, | |
645ca708 | 2234 | .udp_table = &udp_table, |
73cb88ec | 2235 | .seq_fops = &udp_afinfo_seq_fops, |
dda61925 DL |
2236 | .seq_ops = { |
2237 | .show = udp4_seq_show, | |
2238 | }, | |
db8dac20 DM |
2239 | }; |
2240 | ||
2c8c1e72 | 2241 | static int __net_init udp4_proc_init_net(struct net *net) |
15439feb PE |
2242 | { |
2243 | return udp_proc_register(net, &udp4_seq_afinfo); | |
2244 | } | |
2245 | ||
2c8c1e72 | 2246 | static void __net_exit udp4_proc_exit_net(struct net *net) |
15439feb PE |
2247 | { |
2248 | udp_proc_unregister(net, &udp4_seq_afinfo); | |
2249 | } | |
2250 | ||
2251 | static struct pernet_operations udp4_net_ops = { | |
2252 | .init = udp4_proc_init_net, | |
2253 | .exit = udp4_proc_exit_net, | |
2254 | }; | |
2255 | ||
db8dac20 DM |
2256 | int __init udp4_proc_init(void) |
2257 | { | |
15439feb | 2258 | return register_pernet_subsys(&udp4_net_ops); |
db8dac20 DM |
2259 | } |
2260 | ||
2261 | void udp4_proc_exit(void) | |
2262 | { | |
15439feb | 2263 | unregister_pernet_subsys(&udp4_net_ops); |
db8dac20 | 2264 | } |
1da177e4 LT |
2265 | #endif /* CONFIG_PROC_FS */ |
2266 | ||
f86dcc5a ED |
2267 | static __initdata unsigned long uhash_entries; |
2268 | static int __init set_uhash_entries(char *str) | |
645ca708 | 2269 | { |
413c27d8 EZ |
2270 | ssize_t ret; |
2271 | ||
f86dcc5a ED |
2272 | if (!str) |
2273 | return 0; | |
413c27d8 EZ |
2274 | |
2275 | ret = kstrtoul(str, 0, &uhash_entries); | |
2276 | if (ret) | |
2277 | return 0; | |
2278 | ||
f86dcc5a ED |
2279 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) |
2280 | uhash_entries = UDP_HTABLE_SIZE_MIN; | |
2281 | return 1; | |
2282 | } | |
2283 | __setup("uhash_entries=", set_uhash_entries); | |
645ca708 | 2284 | |
f86dcc5a ED |
2285 | void __init udp_table_init(struct udp_table *table, const char *name) |
2286 | { | |
2287 | unsigned int i; | |
2288 | ||
31fe62b9 TB |
2289 | table->hash = alloc_large_system_hash(name, |
2290 | 2 * sizeof(struct udp_hslot), | |
2291 | uhash_entries, | |
2292 | 21, /* one slot per 2 MB */ | |
2293 | 0, | |
2294 | &table->log, | |
2295 | &table->mask, | |
2296 | UDP_HTABLE_SIZE_MIN, | |
2297 | 64 * 1024); | |
2298 | ||
512615b6 | 2299 | table->hash2 = table->hash + (table->mask + 1); |
f86dcc5a | 2300 | for (i = 0; i <= table->mask; i++) { |
88ab1932 | 2301 | INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i); |
fdcc8aa9 | 2302 | table->hash[i].count = 0; |
645ca708 ED |
2303 | spin_lock_init(&table->hash[i].lock); |
2304 | } | |
512615b6 ED |
2305 | for (i = 0; i <= table->mask; i++) { |
2306 | INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i); | |
2307 | table->hash2[i].count = 0; | |
2308 | spin_lock_init(&table->hash2[i].lock); | |
2309 | } | |
645ca708 ED |
2310 | } |
2311 | ||
95766fff HA |
2312 | void __init udp_init(void) |
2313 | { | |
f03d78db | 2314 | unsigned long limit; |
95766fff | 2315 | |
f86dcc5a | 2316 | udp_table_init(&udp_table, "UDP"); |
f03d78db | 2317 | limit = nr_free_buffer_pages() / 8; |
95766fff HA |
2318 | limit = max(limit, 128UL); |
2319 | sysctl_udp_mem[0] = limit / 4 * 3; | |
2320 | sysctl_udp_mem[1] = limit; | |
2321 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; | |
2322 | ||
2323 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; | |
2324 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; | |
2325 | } | |
2326 | ||
d7ca4cc0 SS |
2327 | int udp4_ufo_send_check(struct sk_buff *skb) |
2328 | { | |
73136267 | 2329 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) |
d7ca4cc0 SS |
2330 | return -EINVAL; |
2331 | ||
73136267 PS |
2332 | if (likely(!skb->encapsulation)) { |
2333 | const struct iphdr *iph; | |
2334 | struct udphdr *uh; | |
d7ca4cc0 | 2335 | |
73136267 PS |
2336 | iph = ip_hdr(skb); |
2337 | uh = udp_hdr(skb); | |
2338 | ||
2339 | uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, | |
2340 | IPPROTO_UDP, 0); | |
2341 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
2342 | skb->csum_offset = offsetof(struct udphdr, check); | |
2343 | skb->ip_summed = CHECKSUM_PARTIAL; | |
2344 | } | |
d7ca4cc0 SS |
2345 | return 0; |
2346 | } | |
2347 | ||
73136267 PS |
2348 | static struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb, |
2349 | netdev_features_t features) | |
2350 | { | |
2351 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
2352 | int mac_len = skb->mac_len; | |
2353 | int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb); | |
0d05535d | 2354 | __be16 protocol = skb->protocol; |
73136267 | 2355 | netdev_features_t enc_features; |
0d05535d | 2356 | int outer_hlen; |
73136267 PS |
2357 | |
2358 | if (unlikely(!pskb_may_pull(skb, tnl_hlen))) | |
2359 | goto out; | |
2360 | ||
2361 | skb->encapsulation = 0; | |
2362 | __skb_pull(skb, tnl_hlen); | |
2363 | skb_reset_mac_header(skb); | |
2364 | skb_set_network_header(skb, skb_inner_network_offset(skb)); | |
2365 | skb->mac_len = skb_inner_network_offset(skb); | |
19acc327 | 2366 | skb->protocol = htons(ETH_P_TEB); |
73136267 PS |
2367 | |
2368 | /* segment inner packet. */ | |
2369 | enc_features = skb->dev->hw_enc_features & netif_skb_features(skb); | |
2370 | segs = skb_mac_gso_segment(skb, enc_features); | |
2371 | if (!segs || IS_ERR(segs)) | |
2372 | goto out; | |
2373 | ||
2374 | outer_hlen = skb_tnl_header_len(skb); | |
2375 | skb = segs; | |
2376 | do { | |
2377 | struct udphdr *uh; | |
2378 | int udp_offset = outer_hlen - tnl_hlen; | |
2379 | ||
2380 | skb->mac_len = mac_len; | |
2381 | ||
2382 | skb_push(skb, outer_hlen); | |
2383 | skb_reset_mac_header(skb); | |
2384 | skb_set_network_header(skb, mac_len); | |
2385 | skb_set_transport_header(skb, udp_offset); | |
2386 | uh = udp_hdr(skb); | |
2387 | uh->len = htons(skb->len - udp_offset); | |
2388 | ||
2389 | /* csum segment if tunnel sets skb with csum. */ | |
2390 | if (unlikely(uh->check)) { | |
2391 | struct iphdr *iph = ip_hdr(skb); | |
2392 | ||
2393 | uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
2394 | skb->len - udp_offset, | |
2395 | IPPROTO_UDP, 0); | |
2396 | uh->check = csum_fold(skb_checksum(skb, udp_offset, | |
2397 | skb->len - udp_offset, 0)); | |
2398 | if (uh->check == 0) | |
2399 | uh->check = CSUM_MANGLED_0; | |
2400 | ||
2401 | } | |
2402 | skb->ip_summed = CHECKSUM_NONE; | |
0d05535d | 2403 | skb->protocol = protocol; |
73136267 PS |
2404 | } while ((skb = skb->next)); |
2405 | out: | |
2406 | return segs; | |
2407 | } | |
2408 | ||
c8f44aff MM |
2409 | struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, |
2410 | netdev_features_t features) | |
d7ca4cc0 SS |
2411 | { |
2412 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
2413 | unsigned int mss; | |
d7ca4cc0 SS |
2414 | mss = skb_shinfo(skb)->gso_size; |
2415 | if (unlikely(skb->len <= mss)) | |
2416 | goto out; | |
2417 | ||
2418 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
2419 | /* Packet is from an untrusted source, reset gso_segs. */ | |
2420 | int type = skb_shinfo(skb)->gso_type; | |
2421 | ||
68c33163 | 2422 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY | |
73136267 | 2423 | SKB_GSO_UDP_TUNNEL | |
68c33163 | 2424 | SKB_GSO_GRE) || |
d7ca4cc0 SS |
2425 | !(type & (SKB_GSO_UDP)))) |
2426 | goto out; | |
2427 | ||
2428 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | |
2429 | ||
2430 | segs = NULL; | |
2431 | goto out; | |
2432 | } | |
2433 | ||
d7ca4cc0 SS |
2434 | /* Fragment the skb. IP headers of the fragments are updated in |
2435 | * inet_gso_segment() | |
2436 | */ | |
73136267 PS |
2437 | if (skb->encapsulation && skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL) |
2438 | segs = skb_udp_tunnel_segment(skb, features); | |
2439 | else { | |
2440 | int offset; | |
2441 | __wsum csum; | |
2442 | ||
2443 | /* Do software UFO. Complete and fill in the UDP checksum as | |
2444 | * HW cannot do checksum of UDP packets sent as multiple | |
2445 | * IP fragments. | |
2446 | */ | |
2447 | offset = skb_checksum_start_offset(skb); | |
2448 | csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
2449 | offset += skb->csum_offset; | |
2450 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); | |
2451 | skb->ip_summed = CHECKSUM_NONE; | |
2452 | ||
2453 | segs = skb_segment(skb, features); | |
2454 | } | |
d7ca4cc0 SS |
2455 | out: |
2456 | return segs; | |
2457 | } |