Commit | Line | Data |
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2874c5fd | 1 | /* SPDX-License-Identifier: GPL-2.0-or-later */ |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * Definitions for the UDP module. | |
8 | * | |
9 | * Version: @(#)udp.h 1.0.2 05/07/93 | |
10 | * | |
02c30a84 | 11 | * Authors: Ross Biro |
1da177e4 LT |
12 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : Turned on udp checksums. I don't want to | |
16 | * chase 'memory corruption' bugs that aren't! | |
1da177e4 LT |
17 | */ |
18 | #ifndef _UDP_H | |
19 | #define _UDP_H | |
20 | ||
1da177e4 | 21 | #include <linux/list.h> |
187f1882 | 22 | #include <linux/bug.h> |
14c85021 | 23 | #include <net/inet_sock.h> |
1da177e4 LT |
24 | #include <net/sock.h> |
25 | #include <net/snmp.h> | |
ba4e58ec GR |
26 | #include <net/ip.h> |
27 | #include <linux/ipv6.h> | |
1da177e4 | 28 | #include <linux/seq_file.h> |
bd01f843 | 29 | #include <linux/poll.h> |
6db69328 | 30 | #include <linux/indirect_call_wrapper.h> |
1da177e4 | 31 | |
ba4e58ec GR |
32 | /** |
33 | * struct udp_skb_cb - UDP(-Lite) private variables | |
34 | * | |
35 | * @header: private variables used by IPv4/IPv6 | |
36 | * @cscov: checksum coverage length (UDP-Lite only) | |
37 | * @partial_cov: if set indicates partial csum coverage | |
38 | */ | |
39 | struct udp_skb_cb { | |
40 | union { | |
41 | struct inet_skb_parm h4; | |
dfd56b8b | 42 | #if IS_ENABLED(CONFIG_IPV6) |
ba4e58ec GR |
43 | struct inet6_skb_parm h6; |
44 | #endif | |
45 | } header; | |
46 | __u16 cscov; | |
47 | __u8 partial_cov; | |
48 | }; | |
49 | #define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb)) | |
1da177e4 | 50 | |
fdcc8aa9 ED |
51 | /** |
52 | * struct udp_hslot - UDP hash slot | |
53 | * | |
54 | * @head: head of list of sockets | |
55 | * @count: number of sockets in 'head' list | |
56 | * @lock: spinlock protecting changes to head/count | |
57 | */ | |
645ca708 | 58 | struct udp_hslot { |
ca065d0c | 59 | struct hlist_head head; |
fdcc8aa9 | 60 | int count; |
645ca708 ED |
61 | spinlock_t lock; |
62 | } __attribute__((aligned(2 * sizeof(long)))); | |
f86dcc5a | 63 | |
512615b6 ED |
64 | /** |
65 | * struct udp_table - UDP table | |
66 | * | |
67 | * @hash: hash table, sockets are hashed on (local port) | |
68 | * @hash2: hash table, sockets are hashed on (local port, local address) | |
69 | * @mask: number of slots in hash tables, minus 1 | |
70 | * @log: log2(number of slots in hash table) | |
71 | */ | |
645ca708 | 72 | struct udp_table { |
f86dcc5a | 73 | struct udp_hslot *hash; |
512615b6 ED |
74 | struct udp_hslot *hash2; |
75 | unsigned int mask; | |
76 | unsigned int log; | |
645ca708 ED |
77 | }; |
78 | extern struct udp_table udp_table; | |
1a50bd06 | 79 | void udp_table_init(struct udp_table *, const char *); |
f86dcc5a | 80 | static inline struct udp_hslot *udp_hashslot(struct udp_table *table, |
95c96174 | 81 | struct net *net, unsigned int num) |
f86dcc5a ED |
82 | { |
83 | return &table->hash[udp_hashfn(net, num, table->mask)]; | |
84 | } | |
512615b6 ED |
85 | /* |
86 | * For secondary hash, net_hash_mix() is performed before calling | |
87 | * udp_hashslot2(), this explains difference with udp_hashslot() | |
88 | */ | |
89 | static inline struct udp_hslot *udp_hashslot2(struct udp_table *table, | |
90 | unsigned int hash) | |
91 | { | |
92 | return &table->hash2[hash & table->mask]; | |
93 | } | |
1da177e4 | 94 | |
1da177e4 LT |
95 | extern struct proto udp_prot; |
96 | ||
8d987e5c | 97 | extern atomic_long_t udp_memory_allocated; |
0defbb0a | 98 | DECLARE_PER_CPU(int, udp_memory_per_cpu_fw_alloc); |
95766fff HA |
99 | |
100 | /* sysctl variables for udp */ | |
8d987e5c | 101 | extern long sysctl_udp_mem[3]; |
95766fff HA |
102 | extern int sysctl_udp_rmem_min; |
103 | extern int sysctl_udp_wmem_min; | |
104 | ||
14c85021 | 105 | struct sk_buff; |
1da177e4 | 106 | |
ba4e58ec GR |
107 | /* |
108 | * Generic checksumming routines for UDP(-Lite) v4 and v6 | |
109 | */ | |
b51655b9 | 110 | static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec | 111 | { |
bbdff225 TH |
112 | return (UDP_SKB_CB(skb)->cscov == skb->len ? |
113 | __skb_checksum_complete(skb) : | |
114 | __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov)); | |
ba4e58ec GR |
115 | } |
116 | ||
8e5200f5 | 117 | static inline int udp_lib_checksum_complete(struct sk_buff *skb) |
ba4e58ec | 118 | { |
60476372 | 119 | return !skb_csum_unnecessary(skb) && |
ba4e58ec GR |
120 | __udp_lib_checksum_complete(skb); |
121 | } | |
122 | ||
123 | /** | |
124 | * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments | |
125 | * @sk: socket we are writing to | |
126 | * @skb: sk_buff containing the filled-in UDP header | |
127 | * (checksum field must be zeroed out) | |
128 | */ | |
868c86bc | 129 | static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb) |
ba4e58ec | 130 | { |
9c70220b ACM |
131 | __wsum csum = csum_partial(skb_transport_header(skb), |
132 | sizeof(struct udphdr), 0); | |
ba4e58ec GR |
133 | skb_queue_walk(&sk->sk_write_queue, skb) { |
134 | csum = csum_add(csum, skb->csum); | |
135 | } | |
136 | return csum; | |
137 | } | |
138 | ||
f6b9664f HX |
139 | static inline __wsum udp_csum(struct sk_buff *skb) |
140 | { | |
141 | __wsum csum = csum_partial(skb_transport_header(skb), | |
142 | sizeof(struct udphdr), skb->csum); | |
143 | ||
144 | for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) { | |
145 | csum = csum_add(csum, skb->csum); | |
146 | } | |
147 | return csum; | |
148 | } | |
149 | ||
af5fcba7 TH |
150 | static inline __sum16 udp_v4_check(int len, __be32 saddr, |
151 | __be32 daddr, __wsum base) | |
152 | { | |
153 | return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, base); | |
154 | } | |
155 | ||
156 | void udp_set_csum(bool nocheck, struct sk_buff *skb, | |
157 | __be32 saddr, __be32 daddr, int len); | |
158 | ||
e6afc8ac | 159 | static inline void udp_csum_pull_header(struct sk_buff *skb) |
160 | { | |
595d0b29 ED |
161 | if (!skb->csum_valid && skb->ip_summed == CHECKSUM_NONE) |
162 | skb->csum = csum_partial(skb->data, sizeof(struct udphdr), | |
e6afc8ac | 163 | skb->csum); |
164 | skb_pull_rcsum(skb, sizeof(struct udphdr)); | |
165 | UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr); | |
166 | } | |
167 | ||
7b58e63e | 168 | typedef struct sock *(*udp_lookup_t)(const struct sk_buff *skb, __be16 sport, |
a6024562 TH |
169 | __be16 dport); |
170 | ||
11052589 | 171 | void udp_v6_early_demux(struct sk_buff *skb); |
f9a4719c LR |
172 | INDIRECT_CALLABLE_DECLARE(int udpv6_rcv(struct sk_buff *)); |
173 | ||
ee80d1eb | 174 | struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb, |
c3df39ac | 175 | netdev_features_t features, bool is_ipv6); |
ee80d1eb | 176 | |
ba4e58ec | 177 | /* hash routines shared between UDPv4/6 and UDP-Litev4/6 */ |
086c653f | 178 | static inline int udp_lib_hash(struct sock *sk) |
ba4e58ec GR |
179 | { |
180 | BUG(); | |
086c653f | 181 | return 0; |
ba4e58ec GR |
182 | } |
183 | ||
1a50bd06 JP |
184 | void udp_lib_unhash(struct sock *sk); |
185 | void udp_lib_rehash(struct sock *sk, u16 new_hash); | |
ba4e58ec GR |
186 | |
187 | static inline void udp_lib_close(struct sock *sk, long timeout) | |
188 | { | |
189 | sk_common_release(sk); | |
190 | } | |
191 | ||
1a50bd06 | 192 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
1a50bd06 | 193 | unsigned int hash2_nulladdr); |
ba4e58ec | 194 | |
723b8e46 TH |
195 | u32 udp_flow_hashrnd(void); |
196 | ||
b8f1a556 TH |
197 | static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb, |
198 | int min, int max, bool use_eth) | |
199 | { | |
200 | u32 hash; | |
201 | ||
202 | if (min >= max) { | |
203 | /* Use default range */ | |
204 | inet_get_local_port_range(net, &min, &max); | |
205 | } | |
206 | ||
207 | hash = skb_get_hash(skb); | |
723b8e46 TH |
208 | if (unlikely(!hash)) { |
209 | if (use_eth) { | |
210 | /* Can't find a normal hash, caller has indicated an | |
211 | * Ethernet packet so use that to compute a hash. | |
212 | */ | |
213 | hash = jhash(skb->data, 2 * ETH_ALEN, | |
214 | (__force u32) skb->protocol); | |
215 | } else { | |
216 | /* Can't derive any sort of hash for the packet, set | |
217 | * to some consistent random value. | |
218 | */ | |
219 | hash = udp_flow_hashrnd(); | |
220 | } | |
b8f1a556 TH |
221 | } |
222 | ||
223 | /* Since this is being sent on the wire obfuscate hash a bit | |
224 | * to minimize possbility that any useful information to an | |
225 | * attacker is leaked. Only upper 16 bits are relevant in the | |
226 | * computation for 16 bit port value. | |
227 | */ | |
228 | hash ^= hash << 16; | |
229 | ||
230 | return htons((((u64) hash * (max - min)) >> 32) + min); | |
231 | } | |
232 | ||
6c206b20 PA |
233 | static inline int udp_rqueue_get(struct sock *sk) |
234 | { | |
235 | return sk_rmem_alloc_get(sk) - READ_ONCE(udp_sk(sk)->forward_deficit); | |
236 | } | |
237 | ||
6da5b0f0 MM |
238 | static inline bool udp_sk_bound_dev_eq(struct net *net, int bound_dev_if, |
239 | int dif, int sdif) | |
240 | { | |
241 | #if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV) | |
3d72bb41 | 242 | return inet_bound_dev_eq(!!READ_ONCE(net->ipv4.sysctl_udp_l3mdev_accept), |
6da5b0f0 MM |
243 | bound_dev_if, dif, sdif); |
244 | #else | |
245 | return inet_bound_dev_eq(true, bound_dev_if, dif, sdif); | |
246 | #endif | |
247 | } | |
248 | ||
ba4e58ec | 249 | /* net/ipv4/udp.c */ |
d38afeec | 250 | void udp_destruct_common(struct sock *sk); |
f970bd9e PA |
251 | void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len); |
252 | int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb); | |
7c13f97f | 253 | void udp_skb_destructor(struct sock *sk, struct sk_buff *skb); |
ec095263 OH |
254 | struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags, int *off, |
255 | int *err); | |
7c13f97f | 256 | static inline struct sk_buff *skb_recv_udp(struct sock *sk, unsigned int flags, |
ec095263 | 257 | int *err) |
7c13f97f | 258 | { |
fd69c399 | 259 | int off = 0; |
7c13f97f | 260 | |
ec095263 | 261 | return __skb_recv_udp(sk, flags, &off, err); |
7c13f97f | 262 | } |
f970bd9e | 263 | |
7487449c | 264 | int udp_v4_early_demux(struct sk_buff *skb); |
64f0f5d1 | 265 | bool udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst); |
1a50bd06 JP |
266 | int udp_get_port(struct sock *sk, unsigned short snum, |
267 | int (*saddr_cmp)(const struct sock *, | |
268 | const struct sock *)); | |
32bbd879 | 269 | int udp_err(struct sk_buff *, u32); |
5d77dca8 | 270 | int udp_abort(struct sock *sk, int err); |
1b784140 | 271 | int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len); |
1a50bd06 JP |
272 | int udp_push_pending_frames(struct sock *sk); |
273 | void udp_flush_pending_frames(struct sock *sk); | |
2e8de857 | 274 | int udp_cmsg_send(struct sock *sk, struct msghdr *msg, u16 *gso_size); |
1a50bd06 JP |
275 | void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst); |
276 | int udp_rcv(struct sk_buff *skb); | |
277 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg); | |
f970bd9e | 278 | int udp_init_sock(struct sock *sk); |
d74bad4e | 279 | int udp_pre_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len); |
286c72de | 280 | int __udp_disconnect(struct sock *sk, int flags); |
1a50bd06 | 281 | int udp_disconnect(struct sock *sk, int flags); |
a11e1d43 | 282 | __poll_t udp_poll(struct file *file, struct socket *sock, poll_table *wait); |
1a50bd06 | 283 | struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb, |
8bce6d7d TH |
284 | netdev_features_t features, |
285 | bool is_ipv6); | |
1a50bd06 JP |
286 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
287 | char __user *optval, int __user *optlen); | |
288 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, | |
91ac1cca | 289 | sockptr_t optval, unsigned int optlen, |
1a50bd06 JP |
290 | int (*push_pending_frames)(struct sock *)); |
291 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, | |
292 | __be32 daddr, __be16 dport, int dif); | |
293 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, | |
fb74c277 | 294 | __be32 daddr, __be16 dport, int dif, int sdif, |
538950a1 | 295 | struct udp_table *tbl, struct sk_buff *skb); |
7b58e63e | 296 | struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb, |
63058308 | 297 | __be16 sport, __be16 dport); |
1a50bd06 JP |
298 | struct sock *udp6_lib_lookup(struct net *net, |
299 | const struct in6_addr *saddr, __be16 sport, | |
300 | const struct in6_addr *daddr, __be16 dport, | |
301 | int dif); | |
302 | struct sock *__udp6_lib_lookup(struct net *net, | |
303 | const struct in6_addr *saddr, __be16 sport, | |
304 | const struct in6_addr *daddr, __be16 dport, | |
1801b570 | 305 | int dif, int sdif, struct udp_table *tbl, |
538950a1 | 306 | struct sk_buff *skb); |
7b58e63e | 307 | struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, |
63058308 | 308 | __be16 sport, __be16 dport); |
965b57b4 | 309 | int udp_read_skb(struct sock *sk, skb_read_actor_t recv_actor); |
bcd41303 | 310 | |
b26bbdae PA |
311 | /* UDP uses skb->dev_scratch to cache as much information as possible and avoid |
312 | * possibly multiple cache miss on dequeue() | |
313 | */ | |
b26bbdae | 314 | struct udp_dev_scratch { |
dce4551c PA |
315 | /* skb->truesize and the stateless bit are embedded in a single field; |
316 | * do not use a bitfield since the compiler emits better/smaller code | |
317 | * this way | |
318 | */ | |
319 | u32 _tsize_state; | |
320 | ||
321 | #if BITS_PER_LONG == 64 | |
322 | /* len and the bit needed to compute skb_csum_unnecessary | |
323 | * will be on cold cache lines at recvmsg time. | |
324 | * skb->len can be stored on 16 bits since the udp header has been | |
325 | * already validated and pulled. | |
326 | */ | |
b26bbdae PA |
327 | u16 len; |
328 | bool is_linear; | |
329 | bool csum_unnecessary; | |
dce4551c | 330 | #endif |
b26bbdae PA |
331 | }; |
332 | ||
dce4551c PA |
333 | static inline struct udp_dev_scratch *udp_skb_scratch(struct sk_buff *skb) |
334 | { | |
335 | return (struct udp_dev_scratch *)&skb->dev_scratch; | |
336 | } | |
337 | ||
338 | #if BITS_PER_LONG == 64 | |
b26bbdae PA |
339 | static inline unsigned int udp_skb_len(struct sk_buff *skb) |
340 | { | |
dce4551c | 341 | return udp_skb_scratch(skb)->len; |
b26bbdae PA |
342 | } |
343 | ||
344 | static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb) | |
345 | { | |
dce4551c | 346 | return udp_skb_scratch(skb)->csum_unnecessary; |
b26bbdae PA |
347 | } |
348 | ||
349 | static inline bool udp_skb_is_linear(struct sk_buff *skb) | |
350 | { | |
dce4551c | 351 | return udp_skb_scratch(skb)->is_linear; |
b26bbdae PA |
352 | } |
353 | ||
354 | #else | |
355 | static inline unsigned int udp_skb_len(struct sk_buff *skb) | |
356 | { | |
357 | return skb->len; | |
358 | } | |
359 | ||
360 | static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb) | |
361 | { | |
362 | return skb_csum_unnecessary(skb); | |
363 | } | |
364 | ||
365 | static inline bool udp_skb_is_linear(struct sk_buff *skb) | |
366 | { | |
367 | return !skb_is_nonlinear(skb); | |
368 | } | |
369 | #endif | |
370 | ||
371 | static inline int copy_linear_skb(struct sk_buff *skb, int len, int off, | |
372 | struct iov_iter *to) | |
373 | { | |
42b73059 | 374 | int n; |
b26bbdae | 375 | |
42b73059 AV |
376 | n = copy_to_iter(skb->data + off, len, to); |
377 | if (n == len) | |
b26bbdae PA |
378 | return 0; |
379 | ||
42b73059 | 380 | iov_iter_revert(to, n); |
b26bbdae PA |
381 | return -EFAULT; |
382 | } | |
383 | ||
ba4e58ec GR |
384 | /* |
385 | * SNMP statistics for UDP and UDP-Lite | |
386 | */ | |
6aef70a8 ED |
387 | #define UDP_INC_STATS(net, field, is_udplite) do { \ |
388 | if (is_udplite) SNMP_INC_STATS((net)->mib.udplite_statistics, field); \ | |
389 | else SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0) | |
02c22347 | 390 | #define __UDP_INC_STATS(net, field, is_udplite) do { \ |
13415e46 ED |
391 | if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_statistics, field); \ |
392 | else __SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0) | |
1da177e4 | 393 | |
02c22347 | 394 | #define __UDP6_INC_STATS(net, field, is_udplite) do { \ |
13415e46 ED |
395 | if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_stats_in6, field);\ |
396 | else __SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \ | |
0c7ed677 | 397 | } while(0) |
6aef70a8 ED |
398 | #define UDP6_INC_STATS(net, field, __lite) do { \ |
399 | if (__lite) SNMP_INC_STATS((net)->mib.udplite_stats_in6, field); \ | |
400 | else SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \ | |
0c7ed677 | 401 | } while(0) |
1781f7f5 | 402 | |
dfd56b8b | 403 | #if IS_ENABLED(CONFIG_IPV6) |
cf329aa4 PA |
404 | #define __UDPX_MIB(sk, ipv4) \ |
405 | ({ \ | |
406 | ipv4 ? (IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_statistics : \ | |
407 | sock_net(sk)->mib.udp_statistics) : \ | |
408 | (IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_stats_in6 : \ | |
409 | sock_net(sk)->mib.udp_stats_in6); \ | |
410 | }) | |
1781f7f5 | 411 | #else |
cf329aa4 PA |
412 | #define __UDPX_MIB(sk, ipv4) \ |
413 | ({ \ | |
414 | IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_statistics : \ | |
415 | sock_net(sk)->mib.udp_statistics; \ | |
416 | }) | |
1781f7f5 HX |
417 | #endif |
418 | ||
cf329aa4 PA |
419 | #define __UDPX_INC_STATS(sk, field) \ |
420 | __SNMP_INC_STATS(__UDPX_MIB(sk, (sk)->sk_family == AF_INET), field) | |
421 | ||
a3d2599b | 422 | #ifdef CONFIG_PROC_FS |
1da177e4 | 423 | struct udp_seq_afinfo { |
73cb88ec AV |
424 | sa_family_t family; |
425 | struct udp_table *udp_table; | |
1da177e4 LT |
426 | }; |
427 | ||
428 | struct udp_iter_state { | |
6f191efe | 429 | struct seq_net_private p; |
1da177e4 | 430 | int bucket; |
9e8ca27a | 431 | struct udp_seq_afinfo *bpf_seq_afinfo; |
1da177e4 LT |
432 | }; |
433 | ||
a3d2599b CH |
434 | void *udp_seq_start(struct seq_file *seq, loff_t *pos); |
435 | void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos); | |
436 | void udp_seq_stop(struct seq_file *seq, void *v); | |
437 | ||
c3506372 CH |
438 | extern const struct seq_operations udp_seq_ops; |
439 | extern const struct seq_operations udp6_seq_ops; | |
20380731 | 440 | |
1a50bd06 JP |
441 | int udp4_proc_init(void); |
442 | void udp4_proc_exit(void); | |
a3d2599b | 443 | #endif /* CONFIG_PROC_FS */ |
95766fff | 444 | |
1a50bd06 | 445 | int udpv4_offload_init(void); |
da5bab07 | 446 | |
1a50bd06 | 447 | void udp_init(void); |
d7ca4cc0 | 448 | |
f2e9de21 | 449 | DECLARE_STATIC_KEY_FALSE(udp_encap_needed_key); |
1a50bd06 | 450 | void udp_encap_enable(void); |
a4a600dd | 451 | void udp_encap_disable(void); |
d7f3f621 | 452 | #if IS_ENABLED(CONFIG_IPV6) |
f2e9de21 | 453 | DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key); |
1a50bd06 | 454 | void udpv6_encap_enable(void); |
d7f3f621 | 455 | #endif |
dddb64bc | 456 | |
cf329aa4 PA |
457 | static inline struct sk_buff *udp_rcv_segment(struct sock *sk, |
458 | struct sk_buff *skb, bool ipv4) | |
459 | { | |
f2696099 | 460 | netdev_features_t features = NETIF_F_SG; |
cf329aa4 PA |
461 | struct sk_buff *segs; |
462 | ||
f2696099 ST |
463 | /* Avoid csum recalculation by skb_segment unless userspace explicitly |
464 | * asks for the final checksum values | |
465 | */ | |
466 | if (!inet_get_convert_csum(sk)) | |
467 | features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM; | |
468 | ||
d0208bf4 WB |
469 | /* UDP segmentation expects packets of type CHECKSUM_PARTIAL or |
470 | * CHECKSUM_NONE in __udp_gso_segment. UDP GRO indeed builds partial | |
471 | * packets in udp_gro_complete_segment. As does UDP GSO, verified by | |
472 | * udp_send_skb. But when those packets are looped in dev_loopback_xmit | |
9122a70a CS |
473 | * their ip_summed CHECKSUM_NONE is changed to CHECKSUM_UNNECESSARY. |
474 | * Reset in this specific case, where PARTIAL is both correct and | |
475 | * required. | |
d0208bf4 | 476 | */ |
6cd021a5 WB |
477 | if (skb->pkt_type == PACKET_LOOPBACK) |
478 | skb->ip_summed = CHECKSUM_PARTIAL; | |
479 | ||
cf329aa4 PA |
480 | /* the GSO CB lays after the UDP one, no need to save and restore any |
481 | * CB fragment | |
482 | */ | |
f2696099 | 483 | segs = __skb_gso_segment(skb, features, false); |
974ceb21 | 484 | if (IS_ERR_OR_NULL(segs)) { |
cf329aa4 PA |
485 | int segs_nr = skb_shinfo(skb)->gso_segs; |
486 | ||
487 | atomic_add(segs_nr, &sk->sk_drops); | |
488 | SNMP_ADD_STATS(__UDPX_MIB(sk, ipv4), UDP_MIB_INERRORS, segs_nr); | |
489 | kfree_skb(skb); | |
490 | return NULL; | |
491 | } | |
492 | ||
493 | consume_skb(skb); | |
494 | return segs; | |
495 | } | |
496 | ||
000ac44d PA |
497 | static inline void udp_post_segment_fix_csum(struct sk_buff *skb) |
498 | { | |
499 | /* UDP-lite can't land here - no GRO */ | |
500 | WARN_ON_ONCE(UDP_SKB_CB(skb)->partial_cov); | |
501 | ||
502 | /* UDP packets generated with UDP_SEGMENT and traversing: | |
503 | * | |
504 | * UDP tunnel(xmit) -> veth (segmentation) -> veth (gro) -> UDP tunnel (rx) | |
505 | * | |
506 | * can reach an UDP socket with CHECKSUM_NONE, because | |
507 | * __iptunnel_pull_header() converts CHECKSUM_PARTIAL into NONE. | |
508 | * SKB_GSO_UDP_L4 or SKB_GSO_FRAGLIST packets with no UDP tunnel will | |
509 | * have a valid checksum, as the GRO engine validates the UDP csum | |
510 | * before the aggregation and nobody strips such info in between. | |
511 | * Instead of adding another check in the tunnel fastpath, we can force | |
512 | * a valid csum after the segmentation. | |
513 | * Additionally fixup the UDP CB. | |
514 | */ | |
515 | UDP_SKB_CB(skb)->cscov = skb->len; | |
516 | if (skb->ip_summed == CHECKSUM_NONE && !skb->csum_valid) | |
517 | skb->csum_valid = 1; | |
518 | } | |
519 | ||
88759609 | 520 | #ifdef CONFIG_BPF_SYSCALL |
edc6741c LB |
521 | struct sk_psock; |
522 | struct proto *udp_bpf_get_proto(struct sock *sk, struct sk_psock *psock); | |
51e0158a | 523 | int udp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore); |
88759609 | 524 | #endif |
edc6741c | 525 | |
1da177e4 | 526 | #endif /* _UDP_H */ |