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 | |
1da177e4 LT |
80 | #include <asm/system.h> |
81 | #include <asm/uaccess.h> | |
82 | #include <asm/ioctls.h> | |
95766fff | 83 | #include <linux/bootmem.h> |
8203efb3 ED |
84 | #include <linux/highmem.h> |
85 | #include <linux/swap.h> | |
1da177e4 LT |
86 | #include <linux/types.h> |
87 | #include <linux/fcntl.h> | |
88 | #include <linux/module.h> | |
89 | #include <linux/socket.h> | |
90 | #include <linux/sockios.h> | |
14c85021 | 91 | #include <linux/igmp.h> |
1da177e4 LT |
92 | #include <linux/in.h> |
93 | #include <linux/errno.h> | |
94 | #include <linux/timer.h> | |
95 | #include <linux/mm.h> | |
1da177e4 | 96 | #include <linux/inet.h> |
1da177e4 | 97 | #include <linux/netdevice.h> |
c752f073 | 98 | #include <net/tcp_states.h> |
1da177e4 LT |
99 | #include <linux/skbuff.h> |
100 | #include <linux/proc_fs.h> | |
101 | #include <linux/seq_file.h> | |
457c4cbc | 102 | #include <net/net_namespace.h> |
1da177e4 LT |
103 | #include <net/icmp.h> |
104 | #include <net/route.h> | |
1da177e4 LT |
105 | #include <net/checksum.h> |
106 | #include <net/xfrm.h> | |
ba4e58ec | 107 | #include "udp_impl.h" |
1da177e4 | 108 | |
f86dcc5a | 109 | struct udp_table udp_table __read_mostly; |
645ca708 | 110 | EXPORT_SYMBOL(udp_table); |
1da177e4 | 111 | |
95766fff | 112 | int sysctl_udp_mem[3] __read_mostly; |
95766fff | 113 | EXPORT_SYMBOL(sysctl_udp_mem); |
c482c568 ED |
114 | |
115 | int sysctl_udp_rmem_min __read_mostly; | |
95766fff | 116 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
c482c568 ED |
117 | |
118 | int sysctl_udp_wmem_min __read_mostly; | |
95766fff HA |
119 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
120 | ||
121 | atomic_t udp_memory_allocated; | |
122 | EXPORT_SYMBOL(udp_memory_allocated); | |
123 | ||
f86dcc5a ED |
124 | #define MAX_UDP_PORTS 65536 |
125 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) | |
98322f22 | 126 | |
f24d43c0 | 127 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
645ca708 | 128 | const struct udp_hslot *hslot, |
98322f22 | 129 | unsigned long *bitmap, |
f24d43c0 ED |
130 | struct sock *sk, |
131 | int (*saddr_comp)(const struct sock *sk1, | |
f86dcc5a ED |
132 | const struct sock *sk2), |
133 | unsigned int log) | |
1da177e4 | 134 | { |
f24d43c0 | 135 | struct sock *sk2; |
88ab1932 | 136 | struct hlist_nulls_node *node; |
25030a7f | 137 | |
88ab1932 | 138 | sk_nulls_for_each(sk2, node, &hslot->head) |
f24d43c0 ED |
139 | if (net_eq(sock_net(sk2), net) && |
140 | sk2 != sk && | |
d4cada4a | 141 | (bitmap || udp_sk(sk2)->udp_port_hash == num) && |
f24d43c0 ED |
142 | (!sk2->sk_reuse || !sk->sk_reuse) && |
143 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if | |
144 | || sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
98322f22 ED |
145 | (*saddr_comp)(sk, sk2)) { |
146 | if (bitmap) | |
d4cada4a ED |
147 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, |
148 | bitmap); | |
98322f22 ED |
149 | else |
150 | return 1; | |
151 | } | |
25030a7f GR |
152 | return 0; |
153 | } | |
154 | ||
155 | /** | |
6ba5a3c5 | 156 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
25030a7f GR |
157 | * |
158 | * @sk: socket struct in question | |
159 | * @snum: port number to look up | |
df2bc459 | 160 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
25030a7f | 161 | */ |
6ba5a3c5 | 162 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
df2bc459 | 163 | int (*saddr_comp)(const struct sock *sk1, |
c482c568 | 164 | const struct sock *sk2)) |
25030a7f | 165 | { |
512615b6 | 166 | struct udp_hslot *hslot, *hslot2; |
645ca708 | 167 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
25030a7f | 168 | int error = 1; |
3b1e0a65 | 169 | struct net *net = sock_net(sk); |
1da177e4 | 170 | |
32c1da70 | 171 | if (!snum) { |
9088c560 ED |
172 | int low, high, remaining; |
173 | unsigned rand; | |
98322f22 ED |
174 | unsigned short first, last; |
175 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); | |
32c1da70 | 176 | |
227b60f5 | 177 | inet_get_local_port_range(&low, &high); |
a25de534 | 178 | remaining = (high - low) + 1; |
227b60f5 | 179 | |
9088c560 | 180 | rand = net_random(); |
98322f22 ED |
181 | first = (((u64)rand * remaining) >> 32) + low; |
182 | /* | |
183 | * force rand to be an odd multiple of UDP_HTABLE_SIZE | |
184 | */ | |
f86dcc5a ED |
185 | rand = (rand | 1) * (udptable->mask + 1); |
186 | for (last = first + udptable->mask + 1; | |
187 | first != last; | |
188 | first++) { | |
189 | hslot = udp_hashslot(udptable, net, first); | |
98322f22 | 190 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
645ca708 | 191 | spin_lock_bh(&hslot->lock); |
98322f22 | 192 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
f86dcc5a | 193 | saddr_comp, udptable->log); |
98322f22 ED |
194 | |
195 | snum = first; | |
196 | /* | |
197 | * Iterate on all possible values of snum for this hash. | |
198 | * Using steps of an odd multiple of UDP_HTABLE_SIZE | |
199 | * give us randomization and full range coverage. | |
200 | */ | |
9088c560 | 201 | do { |
98322f22 | 202 | if (low <= snum && snum <= high && |
f86dcc5a | 203 | !test_bit(snum >> udptable->log, bitmap)) |
98322f22 ED |
204 | goto found; |
205 | snum += rand; | |
206 | } while (snum != first); | |
207 | spin_unlock_bh(&hslot->lock); | |
1da177e4 | 208 | } |
98322f22 | 209 | goto fail; |
645ca708 | 210 | } else { |
f86dcc5a | 211 | hslot = udp_hashslot(udptable, net, snum); |
645ca708 | 212 | spin_lock_bh(&hslot->lock); |
f86dcc5a ED |
213 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
214 | saddr_comp, 0)) | |
645ca708 ED |
215 | goto fail_unlock; |
216 | } | |
98322f22 | 217 | found: |
c720c7e8 | 218 | inet_sk(sk)->inet_num = snum; |
d4cada4a ED |
219 | udp_sk(sk)->udp_port_hash = snum; |
220 | udp_sk(sk)->udp_portaddr_hash ^= snum; | |
1da177e4 | 221 | if (sk_unhashed(sk)) { |
88ab1932 | 222 | sk_nulls_add_node_rcu(sk, &hslot->head); |
fdcc8aa9 | 223 | hslot->count++; |
c29a0bc4 | 224 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
512615b6 ED |
225 | |
226 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
227 | spin_lock(&hslot2->lock); | |
228 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, | |
229 | &hslot2->head); | |
230 | hslot2->count++; | |
231 | spin_unlock(&hslot2->lock); | |
1da177e4 | 232 | } |
25030a7f | 233 | error = 0; |
645ca708 ED |
234 | fail_unlock: |
235 | spin_unlock_bh(&hslot->lock); | |
1da177e4 | 236 | fail: |
25030a7f GR |
237 | return error; |
238 | } | |
c482c568 | 239 | EXPORT_SYMBOL(udp_lib_get_port); |
25030a7f | 240 | |
499923c7 | 241 | static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) |
db8dac20 DM |
242 | { |
243 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); | |
244 | ||
c482c568 | 245 | return (!ipv6_only_sock(sk2) && |
c720c7e8 ED |
246 | (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr || |
247 | inet1->inet_rcv_saddr == inet2->inet_rcv_saddr)); | |
db8dac20 DM |
248 | } |
249 | ||
d4cada4a ED |
250 | static unsigned int udp4_portaddr_hash(struct net *net, __be32 saddr, |
251 | unsigned int port) | |
252 | { | |
253 | return jhash_1word(saddr, net_hash_mix(net)) ^ port; | |
254 | } | |
255 | ||
6ba5a3c5 | 256 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
db8dac20 | 257 | { |
d4cada4a ED |
258 | /* precompute partial secondary hash */ |
259 | udp_sk(sk)->udp_portaddr_hash = | |
260 | udp4_portaddr_hash(sock_net(sk), | |
261 | inet_sk(sk)->inet_rcv_saddr, | |
262 | 0); | |
6ba5a3c5 | 263 | return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal); |
db8dac20 DM |
264 | } |
265 | ||
645ca708 ED |
266 | static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr, |
267 | unsigned short hnum, | |
268 | __be16 sport, __be32 daddr, __be16 dport, int dif) | |
269 | { | |
270 | int score = -1; | |
271 | ||
d4cada4a | 272 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
645ca708 ED |
273 | !ipv6_only_sock(sk)) { |
274 | struct inet_sock *inet = inet_sk(sk); | |
275 | ||
276 | score = (sk->sk_family == PF_INET ? 1 : 0); | |
c720c7e8 ED |
277 | if (inet->inet_rcv_saddr) { |
278 | if (inet->inet_rcv_saddr != daddr) | |
645ca708 ED |
279 | return -1; |
280 | score += 2; | |
281 | } | |
c720c7e8 ED |
282 | if (inet->inet_daddr) { |
283 | if (inet->inet_daddr != saddr) | |
645ca708 ED |
284 | return -1; |
285 | score += 2; | |
286 | } | |
c720c7e8 ED |
287 | if (inet->inet_dport) { |
288 | if (inet->inet_dport != sport) | |
645ca708 ED |
289 | return -1; |
290 | score += 2; | |
291 | } | |
292 | if (sk->sk_bound_dev_if) { | |
293 | if (sk->sk_bound_dev_if != dif) | |
294 | return -1; | |
295 | score += 2; | |
296 | } | |
297 | } | |
298 | return score; | |
299 | } | |
300 | ||
db8dac20 DM |
301 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
302 | * harder than this. -DaveM | |
303 | */ | |
304 | static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, | |
305 | __be16 sport, __be32 daddr, __be16 dport, | |
645ca708 | 306 | int dif, struct udp_table *udptable) |
db8dac20 | 307 | { |
271b72c7 | 308 | struct sock *sk, *result; |
88ab1932 | 309 | struct hlist_nulls_node *node; |
db8dac20 | 310 | unsigned short hnum = ntohs(dport); |
f86dcc5a | 311 | unsigned int hash = udp_hashfn(net, hnum, udptable->mask); |
645ca708 | 312 | struct udp_hslot *hslot = &udptable->hash[hash]; |
271b72c7 | 313 | int score, badness; |
645ca708 | 314 | |
271b72c7 ED |
315 | rcu_read_lock(); |
316 | begin: | |
317 | result = NULL; | |
318 | badness = -1; | |
88ab1932 | 319 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
320 | score = compute_score(sk, net, saddr, hnum, sport, |
321 | daddr, dport, dif); | |
322 | if (score > badness) { | |
323 | result = sk; | |
324 | badness = score; | |
db8dac20 DM |
325 | } |
326 | } | |
88ab1932 ED |
327 | /* |
328 | * if the nulls value we got at the end of this lookup is | |
329 | * not the expected one, we must restart lookup. | |
330 | * We probably met an item that was moved to another chain. | |
331 | */ | |
332 | if (get_nulls_value(node) != hash) | |
333 | goto begin; | |
334 | ||
271b72c7 ED |
335 | if (result) { |
336 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) | |
337 | result = NULL; | |
338 | else if (unlikely(compute_score(result, net, saddr, hnum, sport, | |
339 | daddr, dport, dif) < badness)) { | |
340 | sock_put(result); | |
341 | goto begin; | |
342 | } | |
343 | } | |
344 | rcu_read_unlock(); | |
db8dac20 DM |
345 | return result; |
346 | } | |
347 | ||
607c4aaf KK |
348 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
349 | __be16 sport, __be16 dport, | |
645ca708 | 350 | struct udp_table *udptable) |
607c4aaf | 351 | { |
23542618 | 352 | struct sock *sk; |
607c4aaf KK |
353 | const struct iphdr *iph = ip_hdr(skb); |
354 | ||
23542618 KK |
355 | if (unlikely(sk = skb_steal_sock(skb))) |
356 | return sk; | |
357 | else | |
adf30907 | 358 | return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport, |
23542618 KK |
359 | iph->daddr, dport, inet_iif(skb), |
360 | udptable); | |
607c4aaf KK |
361 | } |
362 | ||
bcd41303 KK |
363 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
364 | __be32 daddr, __be16 dport, int dif) | |
365 | { | |
645ca708 | 366 | return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); |
bcd41303 KK |
367 | } |
368 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); | |
369 | ||
920a4611 | 370 | static inline struct sock *udp_v4_mcast_next(struct net *net, struct sock *sk, |
db8dac20 DM |
371 | __be16 loc_port, __be32 loc_addr, |
372 | __be16 rmt_port, __be32 rmt_addr, | |
373 | int dif) | |
374 | { | |
88ab1932 | 375 | struct hlist_nulls_node *node; |
db8dac20 DM |
376 | struct sock *s = sk; |
377 | unsigned short hnum = ntohs(loc_port); | |
378 | ||
88ab1932 | 379 | sk_nulls_for_each_from(s, node) { |
db8dac20 DM |
380 | struct inet_sock *inet = inet_sk(s); |
381 | ||
920a4611 | 382 | if (!net_eq(sock_net(s), net) || |
d4cada4a | 383 | udp_sk(s)->udp_port_hash != hnum || |
c720c7e8 ED |
384 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || |
385 | (inet->inet_dport != rmt_port && inet->inet_dport) || | |
386 | (inet->inet_rcv_saddr && | |
387 | inet->inet_rcv_saddr != loc_addr) || | |
db8dac20 DM |
388 | ipv6_only_sock(s) || |
389 | (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)) | |
390 | continue; | |
391 | if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif)) | |
392 | continue; | |
393 | goto found; | |
394 | } | |
395 | s = NULL; | |
396 | found: | |
397 | return s; | |
398 | } | |
399 | ||
400 | /* | |
401 | * This routine is called by the ICMP module when it gets some | |
402 | * sort of error condition. If err < 0 then the socket should | |
403 | * be closed and the error returned to the user. If err > 0 | |
404 | * it's just the icmp type << 8 | icmp code. | |
405 | * Header points to the ip header of the error packet. We move | |
406 | * on past this. Then (as it used to claim before adjustment) | |
407 | * header points to the first 8 bytes of the udp header. We need | |
408 | * to find the appropriate port. | |
409 | */ | |
410 | ||
645ca708 | 411 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) |
db8dac20 DM |
412 | { |
413 | struct inet_sock *inet; | |
c482c568 ED |
414 | struct iphdr *iph = (struct iphdr *)skb->data; |
415 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); | |
db8dac20 DM |
416 | const int type = icmp_hdr(skb)->type; |
417 | const int code = icmp_hdr(skb)->code; | |
418 | struct sock *sk; | |
419 | int harderr; | |
420 | int err; | |
fd54d716 | 421 | struct net *net = dev_net(skb->dev); |
db8dac20 | 422 | |
fd54d716 | 423 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
db8dac20 DM |
424 | iph->saddr, uh->source, skb->dev->ifindex, udptable); |
425 | if (sk == NULL) { | |
dcfc23ca | 426 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
db8dac20 DM |
427 | return; /* No socket for error */ |
428 | } | |
429 | ||
430 | err = 0; | |
431 | harderr = 0; | |
432 | inet = inet_sk(sk); | |
433 | ||
434 | switch (type) { | |
435 | default: | |
436 | case ICMP_TIME_EXCEEDED: | |
437 | err = EHOSTUNREACH; | |
438 | break; | |
439 | case ICMP_SOURCE_QUENCH: | |
440 | goto out; | |
441 | case ICMP_PARAMETERPROB: | |
442 | err = EPROTO; | |
443 | harderr = 1; | |
444 | break; | |
445 | case ICMP_DEST_UNREACH: | |
446 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
447 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { | |
448 | err = EMSGSIZE; | |
449 | harderr = 1; | |
450 | break; | |
451 | } | |
452 | goto out; | |
453 | } | |
454 | err = EHOSTUNREACH; | |
455 | if (code <= NR_ICMP_UNREACH) { | |
456 | harderr = icmp_err_convert[code].fatal; | |
457 | err = icmp_err_convert[code].errno; | |
458 | } | |
459 | break; | |
460 | } | |
461 | ||
462 | /* | |
463 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
464 | * 4.1.3.3. | |
465 | */ | |
466 | if (!inet->recverr) { | |
467 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
468 | goto out; | |
469 | } else { | |
c482c568 | 470 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
db8dac20 DM |
471 | } |
472 | sk->sk_err = err; | |
473 | sk->sk_error_report(sk); | |
474 | out: | |
475 | sock_put(sk); | |
476 | } | |
477 | ||
478 | void udp_err(struct sk_buff *skb, u32 info) | |
479 | { | |
645ca708 | 480 | __udp4_lib_err(skb, info, &udp_table); |
db8dac20 DM |
481 | } |
482 | ||
483 | /* | |
484 | * Throw away all pending data and cancel the corking. Socket is locked. | |
485 | */ | |
36d926b9 | 486 | void udp_flush_pending_frames(struct sock *sk) |
db8dac20 DM |
487 | { |
488 | struct udp_sock *up = udp_sk(sk); | |
489 | ||
490 | if (up->pending) { | |
491 | up->len = 0; | |
492 | up->pending = 0; | |
493 | ip_flush_pending_frames(sk); | |
494 | } | |
495 | } | |
36d926b9 | 496 | EXPORT_SYMBOL(udp_flush_pending_frames); |
db8dac20 DM |
497 | |
498 | /** | |
499 | * udp4_hwcsum_outgoing - handle outgoing HW checksumming | |
500 | * @sk: socket we are sending on | |
501 | * @skb: sk_buff containing the filled-in UDP header | |
502 | * (checksum field must be zeroed out) | |
503 | */ | |
504 | static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
c482c568 | 505 | __be32 src, __be32 dst, int len) |
db8dac20 DM |
506 | { |
507 | unsigned int offset; | |
508 | struct udphdr *uh = udp_hdr(skb); | |
509 | __wsum csum = 0; | |
510 | ||
511 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
512 | /* | |
513 | * Only one fragment on the socket. | |
514 | */ | |
515 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
516 | skb->csum_offset = offsetof(struct udphdr, check); | |
517 | uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0); | |
518 | } else { | |
519 | /* | |
520 | * HW-checksum won't work as there are two or more | |
521 | * fragments on the socket so that all csums of sk_buffs | |
522 | * should be together | |
523 | */ | |
524 | offset = skb_transport_offset(skb); | |
525 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
526 | ||
527 | skb->ip_summed = CHECKSUM_NONE; | |
528 | ||
529 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
530 | csum = csum_add(csum, skb->csum); | |
531 | } | |
532 | ||
533 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); | |
534 | if (uh->check == 0) | |
535 | uh->check = CSUM_MANGLED_0; | |
536 | } | |
537 | } | |
538 | ||
539 | /* | |
540 | * Push out all pending data as one UDP datagram. Socket is locked. | |
541 | */ | |
542 | static int udp_push_pending_frames(struct sock *sk) | |
543 | { | |
544 | struct udp_sock *up = udp_sk(sk); | |
545 | struct inet_sock *inet = inet_sk(sk); | |
546 | struct flowi *fl = &inet->cork.fl; | |
547 | struct sk_buff *skb; | |
548 | struct udphdr *uh; | |
549 | int err = 0; | |
550 | int is_udplite = IS_UDPLITE(sk); | |
551 | __wsum csum = 0; | |
552 | ||
553 | /* Grab the skbuff where UDP header space exists. */ | |
554 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) | |
555 | goto out; | |
556 | ||
557 | /* | |
558 | * Create a UDP header | |
559 | */ | |
560 | uh = udp_hdr(skb); | |
561 | uh->source = fl->fl_ip_sport; | |
562 | uh->dest = fl->fl_ip_dport; | |
563 | uh->len = htons(up->len); | |
564 | uh->check = 0; | |
565 | ||
566 | if (is_udplite) /* UDP-Lite */ | |
567 | csum = udplite_csum_outgoing(sk, skb); | |
568 | ||
569 | else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */ | |
570 | ||
571 | skb->ip_summed = CHECKSUM_NONE; | |
572 | goto send; | |
573 | ||
574 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
575 | ||
c482c568 | 576 | udp4_hwcsum_outgoing(sk, skb, fl->fl4_src, fl->fl4_dst, up->len); |
db8dac20 DM |
577 | goto send; |
578 | ||
579 | } else /* `normal' UDP */ | |
580 | csum = udp_csum_outgoing(sk, skb); | |
581 | ||
582 | /* add protocol-dependent pseudo-header */ | |
583 | uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len, | |
c482c568 | 584 | sk->sk_protocol, csum); |
db8dac20 DM |
585 | if (uh->check == 0) |
586 | uh->check = CSUM_MANGLED_0; | |
587 | ||
588 | send: | |
589 | err = ip_push_pending_frames(sk); | |
6ce9e7b5 ED |
590 | if (err) { |
591 | if (err == -ENOBUFS && !inet->recverr) { | |
592 | UDP_INC_STATS_USER(sock_net(sk), | |
593 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
594 | err = 0; | |
595 | } | |
596 | } else | |
597 | UDP_INC_STATS_USER(sock_net(sk), | |
598 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
db8dac20 DM |
599 | out: |
600 | up->len = 0; | |
601 | up->pending = 0; | |
db8dac20 DM |
602 | return err; |
603 | } | |
604 | ||
605 | int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
606 | size_t len) | |
607 | { | |
608 | struct inet_sock *inet = inet_sk(sk); | |
609 | struct udp_sock *up = udp_sk(sk); | |
610 | int ulen = len; | |
611 | struct ipcm_cookie ipc; | |
612 | struct rtable *rt = NULL; | |
613 | int free = 0; | |
614 | int connected = 0; | |
615 | __be32 daddr, faddr, saddr; | |
616 | __be16 dport; | |
617 | u8 tos; | |
618 | int err, is_udplite = IS_UDPLITE(sk); | |
619 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; | |
620 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); | |
621 | ||
622 | if (len > 0xFFFF) | |
623 | return -EMSGSIZE; | |
624 | ||
625 | /* | |
626 | * Check the flags. | |
627 | */ | |
628 | ||
c482c568 | 629 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
db8dac20 DM |
630 | return -EOPNOTSUPP; |
631 | ||
632 | ipc.opt = NULL; | |
51f31cab | 633 | ipc.shtx.flags = 0; |
db8dac20 DM |
634 | |
635 | if (up->pending) { | |
636 | /* | |
637 | * There are pending frames. | |
638 | * The socket lock must be held while it's corked. | |
639 | */ | |
640 | lock_sock(sk); | |
641 | if (likely(up->pending)) { | |
642 | if (unlikely(up->pending != AF_INET)) { | |
643 | release_sock(sk); | |
644 | return -EINVAL; | |
645 | } | |
646 | goto do_append_data; | |
647 | } | |
648 | release_sock(sk); | |
649 | } | |
650 | ulen += sizeof(struct udphdr); | |
651 | ||
652 | /* | |
653 | * Get and verify the address. | |
654 | */ | |
655 | if (msg->msg_name) { | |
c482c568 | 656 | struct sockaddr_in * usin = (struct sockaddr_in *)msg->msg_name; |
db8dac20 DM |
657 | if (msg->msg_namelen < sizeof(*usin)) |
658 | return -EINVAL; | |
659 | if (usin->sin_family != AF_INET) { | |
660 | if (usin->sin_family != AF_UNSPEC) | |
661 | return -EAFNOSUPPORT; | |
662 | } | |
663 | ||
664 | daddr = usin->sin_addr.s_addr; | |
665 | dport = usin->sin_port; | |
666 | if (dport == 0) | |
667 | return -EINVAL; | |
668 | } else { | |
669 | if (sk->sk_state != TCP_ESTABLISHED) | |
670 | return -EDESTADDRREQ; | |
c720c7e8 ED |
671 | daddr = inet->inet_daddr; |
672 | dport = inet->inet_dport; | |
db8dac20 DM |
673 | /* Open fast path for connected socket. |
674 | Route will not be used, if at least one option is set. | |
675 | */ | |
676 | connected = 1; | |
677 | } | |
c720c7e8 | 678 | ipc.addr = inet->inet_saddr; |
db8dac20 DM |
679 | |
680 | ipc.oif = sk->sk_bound_dev_if; | |
51f31cab PO |
681 | err = sock_tx_timestamp(msg, sk, &ipc.shtx); |
682 | if (err) | |
683 | return err; | |
db8dac20 | 684 | if (msg->msg_controllen) { |
3b1e0a65 | 685 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); |
db8dac20 DM |
686 | if (err) |
687 | return err; | |
688 | if (ipc.opt) | |
689 | free = 1; | |
690 | connected = 0; | |
691 | } | |
692 | if (!ipc.opt) | |
693 | ipc.opt = inet->opt; | |
694 | ||
695 | saddr = ipc.addr; | |
696 | ipc.addr = faddr = daddr; | |
697 | ||
698 | if (ipc.opt && ipc.opt->srr) { | |
699 | if (!daddr) | |
700 | return -EINVAL; | |
701 | faddr = ipc.opt->faddr; | |
702 | connected = 0; | |
703 | } | |
704 | tos = RT_TOS(inet->tos); | |
705 | if (sock_flag(sk, SOCK_LOCALROUTE) || | |
706 | (msg->msg_flags & MSG_DONTROUTE) || | |
707 | (ipc.opt && ipc.opt->is_strictroute)) { | |
708 | tos |= RTO_ONLINK; | |
709 | connected = 0; | |
710 | } | |
711 | ||
712 | if (ipv4_is_multicast(daddr)) { | |
713 | if (!ipc.oif) | |
714 | ipc.oif = inet->mc_index; | |
715 | if (!saddr) | |
716 | saddr = inet->mc_addr; | |
717 | connected = 0; | |
718 | } | |
719 | ||
720 | if (connected) | |
c482c568 | 721 | rt = (struct rtable *)sk_dst_check(sk, 0); |
db8dac20 DM |
722 | |
723 | if (rt == NULL) { | |
724 | struct flowi fl = { .oif = ipc.oif, | |
914a9ab3 | 725 | .mark = sk->sk_mark, |
db8dac20 DM |
726 | .nl_u = { .ip4_u = |
727 | { .daddr = faddr, | |
728 | .saddr = saddr, | |
729 | .tos = tos } }, | |
730 | .proto = sk->sk_protocol, | |
a134f85c | 731 | .flags = inet_sk_flowi_flags(sk), |
db8dac20 | 732 | .uli_u = { .ports = |
c720c7e8 | 733 | { .sport = inet->inet_sport, |
db8dac20 | 734 | .dport = dport } } }; |
84a3aa00 PE |
735 | struct net *net = sock_net(sk); |
736 | ||
db8dac20 | 737 | security_sk_classify_flow(sk, &fl); |
84a3aa00 | 738 | err = ip_route_output_flow(net, &rt, &fl, sk, 1); |
db8dac20 DM |
739 | if (err) { |
740 | if (err == -ENETUNREACH) | |
7c73a6fa | 741 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
db8dac20 DM |
742 | goto out; |
743 | } | |
744 | ||
745 | err = -EACCES; | |
746 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
747 | !sock_flag(sk, SOCK_BROADCAST)) | |
748 | goto out; | |
749 | if (connected) | |
750 | sk_dst_set(sk, dst_clone(&rt->u.dst)); | |
751 | } | |
752 | ||
753 | if (msg->msg_flags&MSG_CONFIRM) | |
754 | goto do_confirm; | |
755 | back_from_confirm: | |
756 | ||
757 | saddr = rt->rt_src; | |
758 | if (!ipc.addr) | |
759 | daddr = ipc.addr = rt->rt_dst; | |
760 | ||
761 | lock_sock(sk); | |
762 | if (unlikely(up->pending)) { | |
763 | /* The socket is already corked while preparing it. */ | |
764 | /* ... which is an evident application bug. --ANK */ | |
765 | release_sock(sk); | |
766 | ||
767 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); | |
768 | err = -EINVAL; | |
769 | goto out; | |
770 | } | |
771 | /* | |
772 | * Now cork the socket to pend data. | |
773 | */ | |
774 | inet->cork.fl.fl4_dst = daddr; | |
775 | inet->cork.fl.fl_ip_dport = dport; | |
776 | inet->cork.fl.fl4_src = saddr; | |
c720c7e8 | 777 | inet->cork.fl.fl_ip_sport = inet->inet_sport; |
db8dac20 DM |
778 | up->pending = AF_INET; |
779 | ||
780 | do_append_data: | |
781 | up->len += ulen; | |
782 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; | |
783 | err = ip_append_data(sk, getfrag, msg->msg_iov, ulen, | |
2e77d89b | 784 | sizeof(struct udphdr), &ipc, &rt, |
db8dac20 DM |
785 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
786 | if (err) | |
787 | udp_flush_pending_frames(sk); | |
788 | else if (!corkreq) | |
789 | err = udp_push_pending_frames(sk); | |
790 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) | |
791 | up->pending = 0; | |
792 | release_sock(sk); | |
793 | ||
794 | out: | |
795 | ip_rt_put(rt); | |
796 | if (free) | |
797 | kfree(ipc.opt); | |
798 | if (!err) | |
799 | return len; | |
800 | /* | |
801 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
802 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
803 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
804 | * things). We could add another new stat but at least for now that | |
805 | * seems like overkill. | |
806 | */ | |
807 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
629ca23c PE |
808 | UDP_INC_STATS_USER(sock_net(sk), |
809 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
db8dac20 DM |
810 | } |
811 | return err; | |
812 | ||
813 | do_confirm: | |
814 | dst_confirm(&rt->u.dst); | |
815 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
816 | goto back_from_confirm; | |
817 | err = 0; | |
818 | goto out; | |
819 | } | |
c482c568 | 820 | EXPORT_SYMBOL(udp_sendmsg); |
db8dac20 DM |
821 | |
822 | int udp_sendpage(struct sock *sk, struct page *page, int offset, | |
823 | size_t size, int flags) | |
824 | { | |
825 | struct udp_sock *up = udp_sk(sk); | |
826 | int ret; | |
827 | ||
828 | if (!up->pending) { | |
829 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; | |
830 | ||
831 | /* Call udp_sendmsg to specify destination address which | |
832 | * sendpage interface can't pass. | |
833 | * This will succeed only when the socket is connected. | |
834 | */ | |
835 | ret = udp_sendmsg(NULL, sk, &msg, 0); | |
836 | if (ret < 0) | |
837 | return ret; | |
838 | } | |
839 | ||
840 | lock_sock(sk); | |
841 | ||
842 | if (unlikely(!up->pending)) { | |
843 | release_sock(sk); | |
844 | ||
845 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n"); | |
846 | return -EINVAL; | |
847 | } | |
848 | ||
849 | ret = ip_append_page(sk, page, offset, size, flags); | |
850 | if (ret == -EOPNOTSUPP) { | |
851 | release_sock(sk); | |
852 | return sock_no_sendpage(sk->sk_socket, page, offset, | |
853 | size, flags); | |
854 | } | |
855 | if (ret < 0) { | |
856 | udp_flush_pending_frames(sk); | |
857 | goto out; | |
858 | } | |
859 | ||
860 | up->len += size; | |
861 | if (!(up->corkflag || (flags&MSG_MORE))) | |
862 | ret = udp_push_pending_frames(sk); | |
863 | if (!ret) | |
864 | ret = size; | |
865 | out: | |
866 | release_sock(sk); | |
867 | return ret; | |
868 | } | |
869 | ||
85584672 ED |
870 | |
871 | /** | |
872 | * first_packet_length - return length of first packet in receive queue | |
873 | * @sk: socket | |
874 | * | |
875 | * Drops all bad checksum frames, until a valid one is found. | |
876 | * Returns the length of found skb, or 0 if none is found. | |
877 | */ | |
878 | static unsigned int first_packet_length(struct sock *sk) | |
879 | { | |
880 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; | |
881 | struct sk_buff *skb; | |
882 | unsigned int res; | |
883 | ||
884 | __skb_queue_head_init(&list_kill); | |
885 | ||
886 | spin_lock_bh(&rcvq->lock); | |
887 | while ((skb = skb_peek(rcvq)) != NULL && | |
888 | udp_lib_checksum_complete(skb)) { | |
889 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
890 | IS_UDPLITE(sk)); | |
8edf19c2 | 891 | atomic_inc(&sk->sk_drops); |
85584672 ED |
892 | __skb_unlink(skb, rcvq); |
893 | __skb_queue_tail(&list_kill, skb); | |
894 | } | |
895 | res = skb ? skb->len : 0; | |
896 | spin_unlock_bh(&rcvq->lock); | |
897 | ||
898 | if (!skb_queue_empty(&list_kill)) { | |
899 | lock_sock(sk); | |
900 | __skb_queue_purge(&list_kill); | |
901 | sk_mem_reclaim_partial(sk); | |
902 | release_sock(sk); | |
903 | } | |
904 | return res; | |
905 | } | |
906 | ||
1da177e4 LT |
907 | /* |
908 | * IOCTL requests applicable to the UDP protocol | |
909 | */ | |
e905a9ed | 910 | |
1da177e4 LT |
911 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
912 | { | |
6516c655 SH |
913 | switch (cmd) { |
914 | case SIOCOUTQ: | |
1da177e4 | 915 | { |
31e6d363 ED |
916 | int amount = sk_wmem_alloc_get(sk); |
917 | ||
6516c655 SH |
918 | return put_user(amount, (int __user *)arg); |
919 | } | |
1da177e4 | 920 | |
6516c655 SH |
921 | case SIOCINQ: |
922 | { | |
85584672 | 923 | unsigned int amount = first_packet_length(sk); |
6516c655 | 924 | |
85584672 | 925 | if (amount) |
6516c655 SH |
926 | /* |
927 | * We will only return the amount | |
928 | * of this packet since that is all | |
929 | * that will be read. | |
930 | */ | |
85584672 ED |
931 | amount -= sizeof(struct udphdr); |
932 | ||
6516c655 SH |
933 | return put_user(amount, (int __user *)arg); |
934 | } | |
1da177e4 | 935 | |
6516c655 SH |
936 | default: |
937 | return -ENOIOCTLCMD; | |
1da177e4 | 938 | } |
6516c655 SH |
939 | |
940 | return 0; | |
1da177e4 | 941 | } |
c482c568 | 942 | EXPORT_SYMBOL(udp_ioctl); |
1da177e4 | 943 | |
db8dac20 DM |
944 | /* |
945 | * This should be easy, if there is something there we | |
946 | * return it, otherwise we block. | |
947 | */ | |
948 | ||
949 | int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
950 | size_t len, int noblock, int flags, int *addr_len) | |
951 | { | |
952 | struct inet_sock *inet = inet_sk(sk); | |
953 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
954 | struct sk_buff *skb; | |
955 | unsigned int ulen, copied; | |
956 | int peeked; | |
957 | int err; | |
958 | int is_udplite = IS_UDPLITE(sk); | |
959 | ||
960 | /* | |
961 | * Check any passed addresses | |
962 | */ | |
963 | if (addr_len) | |
c482c568 | 964 | *addr_len = sizeof(*sin); |
db8dac20 DM |
965 | |
966 | if (flags & MSG_ERRQUEUE) | |
967 | return ip_recv_error(sk, msg, len); | |
968 | ||
969 | try_again: | |
970 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), | |
971 | &peeked, &err); | |
972 | if (!skb) | |
973 | goto out; | |
974 | ||
975 | ulen = skb->len - sizeof(struct udphdr); | |
976 | copied = len; | |
977 | if (copied > ulen) | |
978 | copied = ulen; | |
979 | else if (copied < ulen) | |
980 | msg->msg_flags |= MSG_TRUNC; | |
981 | ||
982 | /* | |
983 | * If checksum is needed at all, try to do it while copying the | |
984 | * data. If the data is truncated, or if we only want a partial | |
985 | * coverage checksum (UDP-Lite), do it before the copy. | |
986 | */ | |
987 | ||
988 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { | |
989 | if (udp_lib_checksum_complete(skb)) | |
990 | goto csum_copy_err; | |
991 | } | |
992 | ||
993 | if (skb_csum_unnecessary(skb)) | |
994 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), | |
c482c568 | 995 | msg->msg_iov, copied); |
db8dac20 | 996 | else { |
c482c568 ED |
997 | err = skb_copy_and_csum_datagram_iovec(skb, |
998 | sizeof(struct udphdr), | |
999 | msg->msg_iov); | |
db8dac20 DM |
1000 | |
1001 | if (err == -EINVAL) | |
1002 | goto csum_copy_err; | |
1003 | } | |
1004 | ||
1005 | if (err) | |
1006 | goto out_free; | |
1007 | ||
1008 | if (!peeked) | |
629ca23c PE |
1009 | UDP_INC_STATS_USER(sock_net(sk), |
1010 | UDP_MIB_INDATAGRAMS, is_udplite); | |
db8dac20 | 1011 | |
3b885787 | 1012 | sock_recv_ts_and_drops(msg, sk, skb); |
db8dac20 DM |
1013 | |
1014 | /* Copy the address. */ | |
c482c568 | 1015 | if (sin) { |
db8dac20 DM |
1016 | sin->sin_family = AF_INET; |
1017 | sin->sin_port = udp_hdr(skb)->source; | |
1018 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
1019 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
1020 | } | |
1021 | if (inet->cmsg_flags) | |
1022 | ip_cmsg_recv(msg, skb); | |
1023 | ||
1024 | err = copied; | |
1025 | if (flags & MSG_TRUNC) | |
1026 | err = ulen; | |
1027 | ||
1028 | out_free: | |
9d410c79 | 1029 | skb_free_datagram_locked(sk, skb); |
db8dac20 DM |
1030 | out: |
1031 | return err; | |
1032 | ||
1033 | csum_copy_err: | |
1034 | lock_sock(sk); | |
1035 | if (!skb_kill_datagram(sk, skb, flags)) | |
629ca23c | 1036 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
db8dac20 DM |
1037 | release_sock(sk); |
1038 | ||
1039 | if (noblock) | |
1040 | return -EAGAIN; | |
1041 | goto try_again; | |
1042 | } | |
1043 | ||
1044 | ||
1da177e4 LT |
1045 | int udp_disconnect(struct sock *sk, int flags) |
1046 | { | |
1047 | struct inet_sock *inet = inet_sk(sk); | |
1048 | /* | |
1049 | * 1003.1g - break association. | |
1050 | */ | |
e905a9ed | 1051 | |
1da177e4 | 1052 | sk->sk_state = TCP_CLOSE; |
c720c7e8 ED |
1053 | inet->inet_daddr = 0; |
1054 | inet->inet_dport = 0; | |
1da177e4 LT |
1055 | sk->sk_bound_dev_if = 0; |
1056 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
1057 | inet_reset_saddr(sk); | |
1058 | ||
1059 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { | |
1060 | sk->sk_prot->unhash(sk); | |
c720c7e8 | 1061 | inet->inet_sport = 0; |
1da177e4 LT |
1062 | } |
1063 | sk_dst_reset(sk); | |
1064 | return 0; | |
1065 | } | |
c482c568 | 1066 | EXPORT_SYMBOL(udp_disconnect); |
1da177e4 | 1067 | |
645ca708 ED |
1068 | void udp_lib_unhash(struct sock *sk) |
1069 | { | |
723b4610 ED |
1070 | if (sk_hashed(sk)) { |
1071 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
512615b6 ED |
1072 | struct udp_hslot *hslot, *hslot2; |
1073 | ||
1074 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1075 | udp_sk(sk)->udp_port_hash); | |
1076 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
645ca708 | 1077 | |
723b4610 ED |
1078 | spin_lock_bh(&hslot->lock); |
1079 | if (sk_nulls_del_node_init_rcu(sk)) { | |
fdcc8aa9 | 1080 | hslot->count--; |
c720c7e8 | 1081 | inet_sk(sk)->inet_num = 0; |
723b4610 | 1082 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
512615b6 ED |
1083 | |
1084 | spin_lock(&hslot2->lock); | |
1085 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); | |
1086 | hslot2->count--; | |
1087 | spin_unlock(&hslot2->lock); | |
723b4610 ED |
1088 | } |
1089 | spin_unlock_bh(&hslot->lock); | |
645ca708 | 1090 | } |
645ca708 ED |
1091 | } |
1092 | EXPORT_SYMBOL(udp_lib_unhash); | |
1093 | ||
93821778 HX |
1094 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1095 | { | |
766e9037 ED |
1096 | int rc = sock_queue_rcv_skb(sk, skb); |
1097 | ||
1098 | if (rc < 0) { | |
1099 | int is_udplite = IS_UDPLITE(sk); | |
93821778 | 1100 | |
93821778 | 1101 | /* Note that an ENOMEM error is charged twice */ |
766e9037 | 1102 | if (rc == -ENOMEM) |
93821778 HX |
1103 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
1104 | is_udplite); | |
766e9037 ED |
1105 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
1106 | kfree_skb(skb); | |
1107 | return -1; | |
93821778 HX |
1108 | } |
1109 | ||
1110 | return 0; | |
1111 | ||
93821778 HX |
1112 | } |
1113 | ||
db8dac20 DM |
1114 | /* returns: |
1115 | * -1: error | |
1116 | * 0: success | |
1117 | * >0: "udp encap" protocol resubmission | |
1118 | * | |
1119 | * Note that in the success and error cases, the skb is assumed to | |
1120 | * have either been requeued or freed. | |
1121 | */ | |
c482c568 | 1122 | int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
db8dac20 DM |
1123 | { |
1124 | struct udp_sock *up = udp_sk(sk); | |
1125 | int rc; | |
1126 | int is_udplite = IS_UDPLITE(sk); | |
1127 | ||
1128 | /* | |
1129 | * Charge it to the socket, dropping if the queue is full. | |
1130 | */ | |
1131 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1132 | goto drop; | |
1133 | nf_reset(skb); | |
1134 | ||
1135 | if (up->encap_type) { | |
1136 | /* | |
1137 | * This is an encapsulation socket so pass the skb to | |
1138 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
1139 | * fall through and pass this up the UDP socket. | |
1140 | * up->encap_rcv() returns the following value: | |
1141 | * =0 if skb was successfully passed to the encap | |
1142 | * handler or was discarded by it. | |
1143 | * >0 if skb should be passed on to UDP. | |
1144 | * <0 if skb should be resubmitted as proto -N | |
1145 | */ | |
1146 | ||
1147 | /* if we're overly short, let UDP handle it */ | |
1148 | if (skb->len > sizeof(struct udphdr) && | |
1149 | up->encap_rcv != NULL) { | |
1150 | int ret; | |
1151 | ||
1152 | ret = (*up->encap_rcv)(sk, skb); | |
1153 | if (ret <= 0) { | |
0283328e PE |
1154 | UDP_INC_STATS_BH(sock_net(sk), |
1155 | UDP_MIB_INDATAGRAMS, | |
db8dac20 DM |
1156 | is_udplite); |
1157 | return -ret; | |
1158 | } | |
1159 | } | |
1160 | ||
1161 | /* FALLTHROUGH -- it's a UDP Packet */ | |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * UDP-Lite specific tests, ignored on UDP sockets | |
1166 | */ | |
1167 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { | |
1168 | ||
1169 | /* | |
1170 | * MIB statistics other than incrementing the error count are | |
1171 | * disabled for the following two types of errors: these depend | |
1172 | * on the application settings, not on the functioning of the | |
1173 | * protocol stack as such. | |
1174 | * | |
1175 | * RFC 3828 here recommends (sec 3.3): "There should also be a | |
1176 | * way ... to ... at least let the receiving application block | |
1177 | * delivery of packets with coverage values less than a value | |
1178 | * provided by the application." | |
1179 | */ | |
1180 | if (up->pcrlen == 0) { /* full coverage was set */ | |
1181 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage " | |
1182 | "%d while full coverage %d requested\n", | |
1183 | UDP_SKB_CB(skb)->cscov, skb->len); | |
1184 | goto drop; | |
1185 | } | |
1186 | /* The next case involves violating the min. coverage requested | |
1187 | * by the receiver. This is subtle: if receiver wants x and x is | |
1188 | * greater than the buffersize/MTU then receiver will complain | |
1189 | * that it wants x while sender emits packets of smaller size y. | |
1190 | * Therefore the above ...()->partial_cov statement is essential. | |
1191 | */ | |
1192 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
1193 | LIMIT_NETDEBUG(KERN_WARNING | |
1194 | "UDPLITE: coverage %d too small, need min %d\n", | |
1195 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
1196 | goto drop; | |
1197 | } | |
1198 | } | |
1199 | ||
1200 | if (sk->sk_filter) { | |
1201 | if (udp_lib_checksum_complete(skb)) | |
1202 | goto drop; | |
1203 | } | |
1204 | ||
93821778 | 1205 | rc = 0; |
db8dac20 | 1206 | |
93821778 HX |
1207 | bh_lock_sock(sk); |
1208 | if (!sock_owned_by_user(sk)) | |
1209 | rc = __udp_queue_rcv_skb(sk, skb); | |
1210 | else | |
1211 | sk_add_backlog(sk, skb); | |
1212 | bh_unlock_sock(sk); | |
1213 | ||
1214 | return rc; | |
db8dac20 DM |
1215 | |
1216 | drop: | |
0283328e | 1217 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
8edf19c2 | 1218 | atomic_inc(&sk->sk_drops); |
db8dac20 DM |
1219 | kfree_skb(skb); |
1220 | return -1; | |
1221 | } | |
1222 | ||
1223 | /* | |
1224 | * Multicasts and broadcasts go to each listener. | |
1225 | * | |
1226 | * Note: called only from the BH handler context, | |
1227 | * so we don't need to lock the hashes. | |
1228 | */ | |
e3163493 | 1229 | static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
db8dac20 DM |
1230 | struct udphdr *uh, |
1231 | __be32 saddr, __be32 daddr, | |
645ca708 | 1232 | struct udp_table *udptable) |
db8dac20 DM |
1233 | { |
1234 | struct sock *sk; | |
f86dcc5a | 1235 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
db8dac20 DM |
1236 | int dif; |
1237 | ||
645ca708 | 1238 | spin_lock(&hslot->lock); |
88ab1932 | 1239 | sk = sk_nulls_head(&hslot->head); |
db8dac20 | 1240 | dif = skb->dev->ifindex; |
920a4611 | 1241 | sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
db8dac20 DM |
1242 | if (sk) { |
1243 | struct sock *sknext = NULL; | |
1244 | ||
1245 | do { | |
1246 | struct sk_buff *skb1 = skb; | |
1247 | ||
88ab1932 | 1248 | sknext = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest, |
920a4611 ED |
1249 | daddr, uh->source, saddr, |
1250 | dif); | |
db8dac20 DM |
1251 | if (sknext) |
1252 | skb1 = skb_clone(skb, GFP_ATOMIC); | |
1253 | ||
1254 | if (skb1) { | |
93821778 | 1255 | int ret = udp_queue_rcv_skb(sk, skb1); |
db8dac20 DM |
1256 | if (ret > 0) |
1257 | /* we should probably re-process instead | |
1258 | * of dropping packets here. */ | |
1259 | kfree_skb(skb1); | |
1260 | } | |
1261 | sk = sknext; | |
1262 | } while (sknext); | |
1263 | } else | |
ead2ceb0 | 1264 | consume_skb(skb); |
645ca708 | 1265 | spin_unlock(&hslot->lock); |
db8dac20 DM |
1266 | return 0; |
1267 | } | |
1268 | ||
1269 | /* Initialize UDP checksum. If exited with zero value (success), | |
1270 | * CHECKSUM_UNNECESSARY means, that no more checks are required. | |
1271 | * Otherwise, csum completion requires chacksumming packet body, | |
1272 | * including udp header and folding it to skb->csum. | |
1273 | */ | |
1274 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, | |
1275 | int proto) | |
1276 | { | |
1277 | const struct iphdr *iph; | |
1278 | int err; | |
1279 | ||
1280 | UDP_SKB_CB(skb)->partial_cov = 0; | |
1281 | UDP_SKB_CB(skb)->cscov = skb->len; | |
1282 | ||
1283 | if (proto == IPPROTO_UDPLITE) { | |
1284 | err = udplite_checksum_init(skb, uh); | |
1285 | if (err) | |
1286 | return err; | |
1287 | } | |
1288 | ||
1289 | iph = ip_hdr(skb); | |
1290 | if (uh->check == 0) { | |
1291 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1292 | } else if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
c482c568 | 1293 | if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, |
db8dac20 DM |
1294 | proto, skb->csum)) |
1295 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1296 | } | |
1297 | if (!skb_csum_unnecessary(skb)) | |
1298 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, | |
1299 | skb->len, proto, 0); | |
1300 | /* Probably, we should checksum udp header (it should be in cache | |
1301 | * in any case) and data in tiny packets (< rx copybreak). | |
1302 | */ | |
1303 | ||
1304 | return 0; | |
1305 | } | |
1306 | ||
1307 | /* | |
1308 | * All we need to do is get the socket, and then do a checksum. | |
1309 | */ | |
1310 | ||
645ca708 | 1311 | int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
db8dac20 DM |
1312 | int proto) |
1313 | { | |
1314 | struct sock *sk; | |
7b5e56f9 | 1315 | struct udphdr *uh; |
db8dac20 | 1316 | unsigned short ulen; |
adf30907 | 1317 | struct rtable *rt = skb_rtable(skb); |
2783ef23 | 1318 | __be32 saddr, daddr; |
0283328e | 1319 | struct net *net = dev_net(skb->dev); |
db8dac20 DM |
1320 | |
1321 | /* | |
1322 | * Validate the packet. | |
1323 | */ | |
1324 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
1325 | goto drop; /* No space for header. */ | |
1326 | ||
7b5e56f9 | 1327 | uh = udp_hdr(skb); |
db8dac20 DM |
1328 | ulen = ntohs(uh->len); |
1329 | if (ulen > skb->len) | |
1330 | goto short_packet; | |
1331 | ||
1332 | if (proto == IPPROTO_UDP) { | |
1333 | /* UDP validates ulen. */ | |
1334 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) | |
1335 | goto short_packet; | |
1336 | uh = udp_hdr(skb); | |
1337 | } | |
1338 | ||
1339 | if (udp4_csum_init(skb, uh, proto)) | |
1340 | goto csum_error; | |
1341 | ||
2783ef23 JDB |
1342 | saddr = ip_hdr(skb)->saddr; |
1343 | daddr = ip_hdr(skb)->daddr; | |
1344 | ||
db8dac20 | 1345 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
e3163493 PE |
1346 | return __udp4_lib_mcast_deliver(net, skb, uh, |
1347 | saddr, daddr, udptable); | |
db8dac20 | 1348 | |
607c4aaf | 1349 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
db8dac20 DM |
1350 | |
1351 | if (sk != NULL) { | |
93821778 | 1352 | int ret = udp_queue_rcv_skb(sk, skb); |
db8dac20 DM |
1353 | sock_put(sk); |
1354 | ||
1355 | /* a return value > 0 means to resubmit the input, but | |
1356 | * it wants the return to be -protocol, or 0 | |
1357 | */ | |
1358 | if (ret > 0) | |
1359 | return -ret; | |
1360 | return 0; | |
1361 | } | |
1362 | ||
1363 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1364 | goto drop; | |
1365 | nf_reset(skb); | |
1366 | ||
1367 | /* No socket. Drop packet silently, if checksum is wrong */ | |
1368 | if (udp_lib_checksum_complete(skb)) | |
1369 | goto csum_error; | |
1370 | ||
0283328e | 1371 | UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1372 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1373 | ||
1374 | /* | |
1375 | * Hmm. We got an UDP packet to a port to which we | |
1376 | * don't wanna listen. Ignore it. | |
1377 | */ | |
1378 | kfree_skb(skb); | |
1379 | return 0; | |
1380 | ||
1381 | short_packet: | |
673d57e7 | 1382 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
db8dac20 | 1383 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
673d57e7 | 1384 | &saddr, |
db8dac20 DM |
1385 | ntohs(uh->source), |
1386 | ulen, | |
1387 | skb->len, | |
673d57e7 | 1388 | &daddr, |
db8dac20 DM |
1389 | ntohs(uh->dest)); |
1390 | goto drop; | |
1391 | ||
1392 | csum_error: | |
1393 | /* | |
1394 | * RFC1122: OK. Discards the bad packet silently (as far as | |
1395 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). | |
1396 | */ | |
673d57e7 | 1397 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
db8dac20 | 1398 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
673d57e7 | 1399 | &saddr, |
db8dac20 | 1400 | ntohs(uh->source), |
673d57e7 | 1401 | &daddr, |
db8dac20 DM |
1402 | ntohs(uh->dest), |
1403 | ulen); | |
1404 | drop: | |
0283328e | 1405 | UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1406 | kfree_skb(skb); |
1407 | return 0; | |
1408 | } | |
1409 | ||
1410 | int udp_rcv(struct sk_buff *skb) | |
1411 | { | |
645ca708 | 1412 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
db8dac20 DM |
1413 | } |
1414 | ||
7d06b2e0 | 1415 | void udp_destroy_sock(struct sock *sk) |
db8dac20 DM |
1416 | { |
1417 | lock_sock(sk); | |
1418 | udp_flush_pending_frames(sk); | |
1419 | release_sock(sk); | |
db8dac20 DM |
1420 | } |
1421 | ||
1da177e4 LT |
1422 | /* |
1423 | * Socket option code for UDP | |
1424 | */ | |
4c0a6cb0 | 1425 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1426 | char __user *optval, unsigned int optlen, |
4c0a6cb0 | 1427 | int (*push_pending_frames)(struct sock *)) |
1da177e4 LT |
1428 | { |
1429 | struct udp_sock *up = udp_sk(sk); | |
1430 | int val; | |
1431 | int err = 0; | |
b2bf1e26 | 1432 | int is_udplite = IS_UDPLITE(sk); |
1da177e4 | 1433 | |
c482c568 | 1434 | if (optlen < sizeof(int)) |
1da177e4 LT |
1435 | return -EINVAL; |
1436 | ||
1437 | if (get_user(val, (int __user *)optval)) | |
1438 | return -EFAULT; | |
1439 | ||
6516c655 | 1440 | switch (optname) { |
1da177e4 LT |
1441 | case UDP_CORK: |
1442 | if (val != 0) { | |
1443 | up->corkflag = 1; | |
1444 | } else { | |
1445 | up->corkflag = 0; | |
1446 | lock_sock(sk); | |
4c0a6cb0 | 1447 | (*push_pending_frames)(sk); |
1da177e4 LT |
1448 | release_sock(sk); |
1449 | } | |
1450 | break; | |
e905a9ed | 1451 | |
1da177e4 LT |
1452 | case UDP_ENCAP: |
1453 | switch (val) { | |
1454 | case 0: | |
1455 | case UDP_ENCAP_ESPINUDP: | |
1456 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
067b207b JC |
1457 | up->encap_rcv = xfrm4_udp_encap_rcv; |
1458 | /* FALLTHROUGH */ | |
342f0234 | 1459 | case UDP_ENCAP_L2TPINUDP: |
1da177e4 LT |
1460 | up->encap_type = val; |
1461 | break; | |
1462 | default: | |
1463 | err = -ENOPROTOOPT; | |
1464 | break; | |
1465 | } | |
1466 | break; | |
1467 | ||
ba4e58ec GR |
1468 | /* |
1469 | * UDP-Lite's partial checksum coverage (RFC 3828). | |
1470 | */ | |
1471 | /* The sender sets actual checksum coverage length via this option. | |
1472 | * The case coverage > packet length is handled by send module. */ | |
1473 | case UDPLITE_SEND_CSCOV: | |
b2bf1e26 | 1474 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1475 | return -ENOPROTOOPT; |
1476 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ | |
1477 | val = 8; | |
47112e25 GR |
1478 | else if (val > USHORT_MAX) |
1479 | val = USHORT_MAX; | |
ba4e58ec GR |
1480 | up->pcslen = val; |
1481 | up->pcflag |= UDPLITE_SEND_CC; | |
1482 | break; | |
1483 | ||
e905a9ed YH |
1484 | /* The receiver specifies a minimum checksum coverage value. To make |
1485 | * sense, this should be set to at least 8 (as done below). If zero is | |
ba4e58ec GR |
1486 | * used, this again means full checksum coverage. */ |
1487 | case UDPLITE_RECV_CSCOV: | |
b2bf1e26 | 1488 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1489 | return -ENOPROTOOPT; |
1490 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ | |
1491 | val = 8; | |
47112e25 GR |
1492 | else if (val > USHORT_MAX) |
1493 | val = USHORT_MAX; | |
ba4e58ec GR |
1494 | up->pcrlen = val; |
1495 | up->pcflag |= UDPLITE_RECV_CC; | |
1496 | break; | |
1497 | ||
1da177e4 LT |
1498 | default: |
1499 | err = -ENOPROTOOPT; | |
1500 | break; | |
6516c655 | 1501 | } |
1da177e4 LT |
1502 | |
1503 | return err; | |
1504 | } | |
c482c568 | 1505 | EXPORT_SYMBOL(udp_lib_setsockopt); |
1da177e4 | 1506 | |
db8dac20 | 1507 | int udp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1508 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1509 | { |
1510 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1511 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1512 | udp_push_pending_frames); | |
1513 | return ip_setsockopt(sk, level, optname, optval, optlen); | |
1514 | } | |
1515 | ||
1516 | #ifdef CONFIG_COMPAT | |
1517 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 1518 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1519 | { |
1520 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1521 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1522 | udp_push_pending_frames); | |
1523 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); | |
1524 | } | |
1525 | #endif | |
1526 | ||
4c0a6cb0 GR |
1527 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
1528 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
1529 | { |
1530 | struct udp_sock *up = udp_sk(sk); | |
1531 | int val, len; | |
1532 | ||
c482c568 | 1533 | if (get_user(len, optlen)) |
1da177e4 LT |
1534 | return -EFAULT; |
1535 | ||
1536 | len = min_t(unsigned int, len, sizeof(int)); | |
e905a9ed | 1537 | |
6516c655 | 1538 | if (len < 0) |
1da177e4 LT |
1539 | return -EINVAL; |
1540 | ||
6516c655 | 1541 | switch (optname) { |
1da177e4 LT |
1542 | case UDP_CORK: |
1543 | val = up->corkflag; | |
1544 | break; | |
1545 | ||
1546 | case UDP_ENCAP: | |
1547 | val = up->encap_type; | |
1548 | break; | |
1549 | ||
ba4e58ec GR |
1550 | /* The following two cannot be changed on UDP sockets, the return is |
1551 | * always 0 (which corresponds to the full checksum coverage of UDP). */ | |
1552 | case UDPLITE_SEND_CSCOV: | |
1553 | val = up->pcslen; | |
1554 | break; | |
1555 | ||
1556 | case UDPLITE_RECV_CSCOV: | |
1557 | val = up->pcrlen; | |
1558 | break; | |
1559 | ||
1da177e4 LT |
1560 | default: |
1561 | return -ENOPROTOOPT; | |
6516c655 | 1562 | } |
1da177e4 | 1563 | |
6516c655 | 1564 | if (put_user(len, optlen)) |
e905a9ed | 1565 | return -EFAULT; |
c482c568 | 1566 | if (copy_to_user(optval, &val, len)) |
1da177e4 | 1567 | return -EFAULT; |
e905a9ed | 1568 | return 0; |
1da177e4 | 1569 | } |
c482c568 | 1570 | EXPORT_SYMBOL(udp_lib_getsockopt); |
1da177e4 | 1571 | |
db8dac20 DM |
1572 | int udp_getsockopt(struct sock *sk, int level, int optname, |
1573 | char __user *optval, int __user *optlen) | |
1574 | { | |
1575 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1576 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1577 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
1578 | } | |
1579 | ||
1580 | #ifdef CONFIG_COMPAT | |
1581 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, | |
1582 | char __user *optval, int __user *optlen) | |
1583 | { | |
1584 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1585 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1586 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); | |
1587 | } | |
1588 | #endif | |
1da177e4 LT |
1589 | /** |
1590 | * udp_poll - wait for a UDP event. | |
1591 | * @file - file struct | |
1592 | * @sock - socket | |
1593 | * @wait - poll table | |
1594 | * | |
e905a9ed | 1595 | * This is same as datagram poll, except for the special case of |
1da177e4 LT |
1596 | * blocking sockets. If application is using a blocking fd |
1597 | * and a packet with checksum error is in the queue; | |
1598 | * then it could get return from select indicating data available | |
1599 | * but then block when reading it. Add special case code | |
1600 | * to work around these arguably broken applications. | |
1601 | */ | |
1602 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) | |
1603 | { | |
1604 | unsigned int mask = datagram_poll(file, sock, wait); | |
1605 | struct sock *sk = sock->sk; | |
ba4e58ec | 1606 | |
1da177e4 | 1607 | /* Check for false positives due to checksum errors */ |
85584672 ED |
1608 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
1609 | !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk)) | |
1610 | mask &= ~(POLLIN | POLLRDNORM); | |
1da177e4 LT |
1611 | |
1612 | return mask; | |
e905a9ed | 1613 | |
1da177e4 | 1614 | } |
c482c568 | 1615 | EXPORT_SYMBOL(udp_poll); |
1da177e4 | 1616 | |
db8dac20 DM |
1617 | struct proto udp_prot = { |
1618 | .name = "UDP", | |
1619 | .owner = THIS_MODULE, | |
1620 | .close = udp_lib_close, | |
1621 | .connect = ip4_datagram_connect, | |
1622 | .disconnect = udp_disconnect, | |
1623 | .ioctl = udp_ioctl, | |
1624 | .destroy = udp_destroy_sock, | |
1625 | .setsockopt = udp_setsockopt, | |
1626 | .getsockopt = udp_getsockopt, | |
1627 | .sendmsg = udp_sendmsg, | |
1628 | .recvmsg = udp_recvmsg, | |
1629 | .sendpage = udp_sendpage, | |
93821778 | 1630 | .backlog_rcv = __udp_queue_rcv_skb, |
db8dac20 DM |
1631 | .hash = udp_lib_hash, |
1632 | .unhash = udp_lib_unhash, | |
1633 | .get_port = udp_v4_get_port, | |
1634 | .memory_allocated = &udp_memory_allocated, | |
1635 | .sysctl_mem = sysctl_udp_mem, | |
1636 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1637 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
1638 | .obj_size = sizeof(struct udp_sock), | |
271b72c7 | 1639 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1640 | .h.udp_table = &udp_table, |
db8dac20 DM |
1641 | #ifdef CONFIG_COMPAT |
1642 | .compat_setsockopt = compat_udp_setsockopt, | |
1643 | .compat_getsockopt = compat_udp_getsockopt, | |
1644 | #endif | |
db8dac20 | 1645 | }; |
c482c568 | 1646 | EXPORT_SYMBOL(udp_prot); |
1da177e4 LT |
1647 | |
1648 | /* ------------------------------------------------------------------------ */ | |
1649 | #ifdef CONFIG_PROC_FS | |
1650 | ||
645ca708 | 1651 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
1da177e4 LT |
1652 | { |
1653 | struct sock *sk; | |
1654 | struct udp_iter_state *state = seq->private; | |
6f191efe | 1655 | struct net *net = seq_file_net(seq); |
1da177e4 | 1656 | |
f86dcc5a ED |
1657 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
1658 | ++state->bucket) { | |
88ab1932 | 1659 | struct hlist_nulls_node *node; |
645ca708 | 1660 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
f86dcc5a ED |
1661 | |
1662 | if (hlist_nulls_empty(&hslot->head)) | |
1663 | continue; | |
1664 | ||
645ca708 | 1665 | spin_lock_bh(&hslot->lock); |
88ab1932 | 1666 | sk_nulls_for_each(sk, node, &hslot->head) { |
878628fb | 1667 | if (!net_eq(sock_net(sk), net)) |
a91275ef | 1668 | continue; |
1da177e4 LT |
1669 | if (sk->sk_family == state->family) |
1670 | goto found; | |
1671 | } | |
645ca708 | 1672 | spin_unlock_bh(&hslot->lock); |
1da177e4 LT |
1673 | } |
1674 | sk = NULL; | |
1675 | found: | |
1676 | return sk; | |
1677 | } | |
1678 | ||
1679 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) | |
1680 | { | |
1681 | struct udp_iter_state *state = seq->private; | |
6f191efe | 1682 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1683 | |
1684 | do { | |
88ab1932 | 1685 | sk = sk_nulls_next(sk); |
878628fb | 1686 | } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); |
1da177e4 | 1687 | |
645ca708 | 1688 | if (!sk) { |
f86dcc5a | 1689 | if (state->bucket <= state->udp_table->mask) |
30842f29 | 1690 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
645ca708 | 1691 | return udp_get_first(seq, state->bucket + 1); |
1da177e4 LT |
1692 | } |
1693 | return sk; | |
1694 | } | |
1695 | ||
1696 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) | |
1697 | { | |
645ca708 | 1698 | struct sock *sk = udp_get_first(seq, 0); |
1da177e4 LT |
1699 | |
1700 | if (sk) | |
6516c655 | 1701 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
1da177e4 LT |
1702 | --pos; |
1703 | return pos ? NULL : sk; | |
1704 | } | |
1705 | ||
1706 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) | |
1707 | { | |
30842f29 | 1708 | struct udp_iter_state *state = seq->private; |
f86dcc5a | 1709 | state->bucket = MAX_UDP_PORTS; |
30842f29 | 1710 | |
b50660f1 | 1711 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
1da177e4 LT |
1712 | } |
1713 | ||
1714 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1715 | { | |
1716 | struct sock *sk; | |
1717 | ||
b50660f1 | 1718 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
1719 | sk = udp_get_idx(seq, 0); |
1720 | else | |
1721 | sk = udp_get_next(seq, v); | |
1722 | ||
1723 | ++*pos; | |
1724 | return sk; | |
1725 | } | |
1726 | ||
1727 | static void udp_seq_stop(struct seq_file *seq, void *v) | |
1728 | { | |
645ca708 ED |
1729 | struct udp_iter_state *state = seq->private; |
1730 | ||
f86dcc5a | 1731 | if (state->bucket <= state->udp_table->mask) |
645ca708 | 1732 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
1da177e4 LT |
1733 | } |
1734 | ||
1735 | static int udp_seq_open(struct inode *inode, struct file *file) | |
1736 | { | |
1737 | struct udp_seq_afinfo *afinfo = PDE(inode)->data; | |
a2be75c1 DL |
1738 | struct udp_iter_state *s; |
1739 | int err; | |
a91275ef | 1740 | |
a2be75c1 DL |
1741 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
1742 | sizeof(struct udp_iter_state)); | |
1743 | if (err < 0) | |
1744 | return err; | |
a91275ef | 1745 | |
a2be75c1 | 1746 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 1747 | s->family = afinfo->family; |
645ca708 | 1748 | s->udp_table = afinfo->udp_table; |
a2be75c1 | 1749 | return err; |
a91275ef DL |
1750 | } |
1751 | ||
1da177e4 | 1752 | /* ------------------------------------------------------------------------ */ |
0c96d8c5 | 1753 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 LT |
1754 | { |
1755 | struct proc_dir_entry *p; | |
1756 | int rc = 0; | |
1757 | ||
3ba9441b DL |
1758 | afinfo->seq_fops.open = udp_seq_open; |
1759 | afinfo->seq_fops.read = seq_read; | |
1760 | afinfo->seq_fops.llseek = seq_lseek; | |
1761 | afinfo->seq_fops.release = seq_release_net; | |
1da177e4 | 1762 | |
dda61925 DL |
1763 | afinfo->seq_ops.start = udp_seq_start; |
1764 | afinfo->seq_ops.next = udp_seq_next; | |
1765 | afinfo->seq_ops.stop = udp_seq_stop; | |
1766 | ||
84841c3c DL |
1767 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
1768 | &afinfo->seq_fops, afinfo); | |
1769 | if (!p) | |
1da177e4 LT |
1770 | rc = -ENOMEM; |
1771 | return rc; | |
1772 | } | |
c482c568 | 1773 | EXPORT_SYMBOL(udp_proc_register); |
1da177e4 | 1774 | |
0c96d8c5 | 1775 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 | 1776 | { |
0c96d8c5 | 1777 | proc_net_remove(net, afinfo->name); |
1da177e4 | 1778 | } |
c482c568 | 1779 | EXPORT_SYMBOL(udp_proc_unregister); |
db8dac20 DM |
1780 | |
1781 | /* ------------------------------------------------------------------------ */ | |
5e659e4c PE |
1782 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
1783 | int bucket, int *len) | |
db8dac20 DM |
1784 | { |
1785 | struct inet_sock *inet = inet_sk(sp); | |
c720c7e8 ED |
1786 | __be32 dest = inet->inet_daddr; |
1787 | __be32 src = inet->inet_rcv_saddr; | |
1788 | __u16 destp = ntohs(inet->inet_dport); | |
1789 | __u16 srcp = ntohs(inet->inet_sport); | |
db8dac20 | 1790 | |
f86dcc5a | 1791 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
cb61cb9b | 1792 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d%n", |
db8dac20 | 1793 | bucket, src, srcp, dest, destp, sp->sk_state, |
31e6d363 ED |
1794 | sk_wmem_alloc_get(sp), |
1795 | sk_rmem_alloc_get(sp), | |
db8dac20 | 1796 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), |
cb61cb9b ED |
1797 | atomic_read(&sp->sk_refcnt), sp, |
1798 | atomic_read(&sp->sk_drops), len); | |
db8dac20 DM |
1799 | } |
1800 | ||
1801 | int udp4_seq_show(struct seq_file *seq, void *v) | |
1802 | { | |
1803 | if (v == SEQ_START_TOKEN) | |
1804 | seq_printf(seq, "%-127s\n", | |
1805 | " sl local_address rem_address st tx_queue " | |
1806 | "rx_queue tr tm->when retrnsmt uid timeout " | |
cb61cb9b | 1807 | "inode ref pointer drops"); |
db8dac20 | 1808 | else { |
db8dac20 | 1809 | struct udp_iter_state *state = seq->private; |
5e659e4c | 1810 | int len; |
db8dac20 | 1811 | |
5e659e4c | 1812 | udp4_format_sock(v, seq, state->bucket, &len); |
c482c568 | 1813 | seq_printf(seq, "%*s\n", 127 - len, ""); |
db8dac20 DM |
1814 | } |
1815 | return 0; | |
1816 | } | |
1817 | ||
1818 | /* ------------------------------------------------------------------------ */ | |
db8dac20 | 1819 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
db8dac20 DM |
1820 | .name = "udp", |
1821 | .family = AF_INET, | |
645ca708 | 1822 | .udp_table = &udp_table, |
4ad96d39 DL |
1823 | .seq_fops = { |
1824 | .owner = THIS_MODULE, | |
1825 | }, | |
dda61925 DL |
1826 | .seq_ops = { |
1827 | .show = udp4_seq_show, | |
1828 | }, | |
db8dac20 DM |
1829 | }; |
1830 | ||
15439feb PE |
1831 | static int udp4_proc_init_net(struct net *net) |
1832 | { | |
1833 | return udp_proc_register(net, &udp4_seq_afinfo); | |
1834 | } | |
1835 | ||
1836 | static void udp4_proc_exit_net(struct net *net) | |
1837 | { | |
1838 | udp_proc_unregister(net, &udp4_seq_afinfo); | |
1839 | } | |
1840 | ||
1841 | static struct pernet_operations udp4_net_ops = { | |
1842 | .init = udp4_proc_init_net, | |
1843 | .exit = udp4_proc_exit_net, | |
1844 | }; | |
1845 | ||
db8dac20 DM |
1846 | int __init udp4_proc_init(void) |
1847 | { | |
15439feb | 1848 | return register_pernet_subsys(&udp4_net_ops); |
db8dac20 DM |
1849 | } |
1850 | ||
1851 | void udp4_proc_exit(void) | |
1852 | { | |
15439feb | 1853 | unregister_pernet_subsys(&udp4_net_ops); |
db8dac20 | 1854 | } |
1da177e4 LT |
1855 | #endif /* CONFIG_PROC_FS */ |
1856 | ||
f86dcc5a ED |
1857 | static __initdata unsigned long uhash_entries; |
1858 | static int __init set_uhash_entries(char *str) | |
645ca708 | 1859 | { |
f86dcc5a ED |
1860 | if (!str) |
1861 | return 0; | |
1862 | uhash_entries = simple_strtoul(str, &str, 0); | |
1863 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) | |
1864 | uhash_entries = UDP_HTABLE_SIZE_MIN; | |
1865 | return 1; | |
1866 | } | |
1867 | __setup("uhash_entries=", set_uhash_entries); | |
645ca708 | 1868 | |
f86dcc5a ED |
1869 | void __init udp_table_init(struct udp_table *table, const char *name) |
1870 | { | |
1871 | unsigned int i; | |
1872 | ||
1873 | if (!CONFIG_BASE_SMALL) | |
1874 | table->hash = alloc_large_system_hash(name, | |
512615b6 | 1875 | 2 * sizeof(struct udp_hslot), |
f86dcc5a ED |
1876 | uhash_entries, |
1877 | 21, /* one slot per 2 MB */ | |
1878 | 0, | |
1879 | &table->log, | |
1880 | &table->mask, | |
1881 | 64 * 1024); | |
1882 | /* | |
1883 | * Make sure hash table has the minimum size | |
1884 | */ | |
1885 | if (CONFIG_BASE_SMALL || table->mask < UDP_HTABLE_SIZE_MIN - 1) { | |
1886 | table->hash = kmalloc(UDP_HTABLE_SIZE_MIN * | |
512615b6 | 1887 | 2 * sizeof(struct udp_hslot), GFP_KERNEL); |
f86dcc5a ED |
1888 | if (!table->hash) |
1889 | panic(name); | |
1890 | table->log = ilog2(UDP_HTABLE_SIZE_MIN); | |
1891 | table->mask = UDP_HTABLE_SIZE_MIN - 1; | |
1892 | } | |
512615b6 | 1893 | table->hash2 = table->hash + (table->mask + 1); |
f86dcc5a | 1894 | for (i = 0; i <= table->mask; i++) { |
88ab1932 | 1895 | INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i); |
fdcc8aa9 | 1896 | table->hash[i].count = 0; |
645ca708 ED |
1897 | spin_lock_init(&table->hash[i].lock); |
1898 | } | |
512615b6 ED |
1899 | for (i = 0; i <= table->mask; i++) { |
1900 | INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i); | |
1901 | table->hash2[i].count = 0; | |
1902 | spin_lock_init(&table->hash2[i].lock); | |
1903 | } | |
645ca708 ED |
1904 | } |
1905 | ||
95766fff HA |
1906 | void __init udp_init(void) |
1907 | { | |
8203efb3 | 1908 | unsigned long nr_pages, limit; |
95766fff | 1909 | |
f86dcc5a | 1910 | udp_table_init(&udp_table, "UDP"); |
95766fff HA |
1911 | /* Set the pressure threshold up by the same strategy of TCP. It is a |
1912 | * fraction of global memory that is up to 1/2 at 256 MB, decreasing | |
1913 | * toward zero with the amount of memory, with a floor of 128 pages. | |
1914 | */ | |
8203efb3 ED |
1915 | nr_pages = totalram_pages - totalhigh_pages; |
1916 | limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); | |
1917 | limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); | |
95766fff HA |
1918 | limit = max(limit, 128UL); |
1919 | sysctl_udp_mem[0] = limit / 4 * 3; | |
1920 | sysctl_udp_mem[1] = limit; | |
1921 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; | |
1922 | ||
1923 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; | |
1924 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; | |
1925 | } | |
1926 | ||
d7ca4cc0 SS |
1927 | int udp4_ufo_send_check(struct sk_buff *skb) |
1928 | { | |
1929 | const struct iphdr *iph; | |
1930 | struct udphdr *uh; | |
1931 | ||
1932 | if (!pskb_may_pull(skb, sizeof(*uh))) | |
1933 | return -EINVAL; | |
1934 | ||
1935 | iph = ip_hdr(skb); | |
1936 | uh = udp_hdr(skb); | |
1937 | ||
1938 | uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, | |
1939 | IPPROTO_UDP, 0); | |
1940 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1941 | skb->csum_offset = offsetof(struct udphdr, check); | |
1942 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1943 | return 0; | |
1944 | } | |
1945 | ||
1946 | struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, int features) | |
1947 | { | |
1948 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
1949 | unsigned int mss; | |
1950 | int offset; | |
1951 | __wsum csum; | |
1952 | ||
1953 | mss = skb_shinfo(skb)->gso_size; | |
1954 | if (unlikely(skb->len <= mss)) | |
1955 | goto out; | |
1956 | ||
1957 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
1958 | /* Packet is from an untrusted source, reset gso_segs. */ | |
1959 | int type = skb_shinfo(skb)->gso_type; | |
1960 | ||
1961 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || | |
1962 | !(type & (SKB_GSO_UDP)))) | |
1963 | goto out; | |
1964 | ||
1965 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | |
1966 | ||
1967 | segs = NULL; | |
1968 | goto out; | |
1969 | } | |
1970 | ||
1971 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot | |
1972 | * do checksum of UDP packets sent as multiple IP fragments. | |
1973 | */ | |
1974 | offset = skb->csum_start - skb_headroom(skb); | |
c482c568 | 1975 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
d7ca4cc0 SS |
1976 | offset += skb->csum_offset; |
1977 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); | |
1978 | skb->ip_summed = CHECKSUM_NONE; | |
1979 | ||
1980 | /* Fragment the skb. IP headers of the fragments are updated in | |
1981 | * inet_gso_segment() | |
1982 | */ | |
1983 | segs = skb_segment(skb, features); | |
1984 | out: | |
1985 | return segs; | |
1986 | } | |
1987 |