1/* SPDX-License-Identifier: GPL-2.0-or-later */
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 *
11 * Authors: Ross Biro
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!
17 */
18#ifndef _UDP_H
19#define _UDP_H
20
21#include <linux/list.h>
22#include <linux/bug.h>
23#include <net/inet_sock.h>
24#include <net/gso.h>
25#include <net/sock.h>
26#include <net/snmp.h>
27#include <net/ip.h>
28#include <linux/ipv6.h>
29#include <linux/seq_file.h>
30#include <linux/poll.h>
31#include <linux/indirect_call_wrapper.h>
32
33/**
34 * struct udp_skb_cb - UDP(-Lite) private variables
35 *
36 * @header: private variables used by IPv4/IPv6
37 * @cscov: checksum coverage length (UDP-Lite only)
38 * @partial_cov: if set indicates partial csum coverage
39 */
40struct udp_skb_cb {
41 union {
42 struct inet_skb_parm h4;
43#if IS_ENABLED(CONFIG_IPV6)
44 struct inet6_skb_parm h6;
45#endif
46 } header;
47 __u16 cscov;
48 __u8 partial_cov;
49};
50#define UDP_SKB_CB(__skb) ((struct udp_skb_cb *)((__skb)->cb))
51
52/**
53 * struct udp_hslot - UDP hash slot used by udp_table.hash/hash4
54 *
55 * @head: head of list of sockets
56 * @nulls_head: head of list of sockets, only used by hash4
57 * @count: number of sockets in 'head' list
58 * @lock: spinlock protecting changes to head/count
59 */
60struct udp_hslot {
61 union {
62 struct hlist_head head;
63 /* hash4 uses hlist_nulls to avoid moving wrongly onto another
64 * hlist, because rehash() can happen with lookup().
65 */
66 struct hlist_nulls_head nulls_head;
67 };
68 int count;
69 spinlock_t lock;
70} __aligned(2 * sizeof(long));
71
72/**
73 * struct udp_hslot_main - UDP hash slot used by udp_table.hash2
74 *
75 * @hslot: basic hash slot
76 * @hash4_cnt: number of sockets in hslot4 of the same
77 * (local port, local address)
78 */
79struct udp_hslot_main {
80 struct udp_hslot hslot; /* must be the first member */
81#if !IS_ENABLED(CONFIG_BASE_SMALL)
82 u32 hash4_cnt;
83#endif
84} __aligned(2 * sizeof(long));
85#define UDP_HSLOT_MAIN(__hslot) ((struct udp_hslot_main *)(__hslot))
86
87/**
88 * struct udp_table - UDP table
89 *
90 * @hash: hash table, sockets are hashed on (local port)
91 * @hash2: hash table, sockets are hashed on (local port, local address)
92 * @hash4: hash table, connected sockets are hashed on
93 * (local port, local address, remote port, remote address)
94 * @mask: number of slots in hash tables, minus 1
95 * @log: log2(number of slots in hash table)
96 */
97struct udp_table {
98 struct udp_hslot *hash;
99 struct udp_hslot_main *hash2;
100#if !IS_ENABLED(CONFIG_BASE_SMALL)
101 struct udp_hslot *hash4;
102#endif
103 unsigned int mask;
104 unsigned int log;
105};
106extern struct udp_table udp_table;
107void udp_table_init(struct udp_table *, const char *);
108static inline struct udp_hslot *udp_hashslot(struct udp_table *table,
109 const struct net *net,
110 unsigned int num)
111{
112 return &table->hash[udp_hashfn(net, num, mask: table->mask)];
113}
114
115/*
116 * For secondary hash, net_hash_mix() is performed before calling
117 * udp_hashslot2(), this explains difference with udp_hashslot()
118 */
119static inline struct udp_hslot *udp_hashslot2(struct udp_table *table,
120 unsigned int hash)
121{
122 return &table->hash2[hash & table->mask].hslot;
123}
124
125#if IS_ENABLED(CONFIG_BASE_SMALL)
126static inline void udp_table_hash4_init(struct udp_table *table)
127{
128}
129
130static inline struct udp_hslot *udp_hashslot4(struct udp_table *table,
131 unsigned int hash)
132{
133 BUILD_BUG();
134 return NULL;
135}
136
137static inline bool udp_hashed4(const struct sock *sk)
138{
139 return false;
140}
141
142static inline unsigned int udp_hash4_slot_size(void)
143{
144 return 0;
145}
146
147static inline bool udp_has_hash4(const struct udp_hslot *hslot2)
148{
149 return false;
150}
151
152static inline void udp_hash4_inc(struct udp_hslot *hslot2)
153{
154}
155
156static inline void udp_hash4_dec(struct udp_hslot *hslot2)
157{
158}
159#else /* !CONFIG_BASE_SMALL */
160
161/* Must be called with table->hash2 initialized */
162static inline void udp_table_hash4_init(struct udp_table *table)
163{
164 table->hash4 = (void *)(table->hash2 + (table->mask + 1));
165 for (int i = 0; i <= table->mask; i++) {
166 table->hash2[i].hash4_cnt = 0;
167
168 INIT_HLIST_NULLS_HEAD(&table->hash4[i].nulls_head, i);
169 table->hash4[i].count = 0;
170 spin_lock_init(&table->hash4[i].lock);
171 }
172}
173
174static inline struct udp_hslot *udp_hashslot4(struct udp_table *table,
175 unsigned int hash)
176{
177 return &table->hash4[hash & table->mask];
178}
179
180static inline bool udp_hashed4(const struct sock *sk)
181{
182 return !hlist_nulls_unhashed(&udp_sk(sk)->udp_lrpa_node);
183}
184
185static inline unsigned int udp_hash4_slot_size(void)
186{
187 return sizeof(struct udp_hslot);
188}
189
190static inline bool udp_has_hash4(const struct udp_hslot *hslot2)
191{
192 return UDP_HSLOT_MAIN(hslot2)->hash4_cnt;
193}
194
195static inline void udp_hash4_inc(struct udp_hslot *hslot2)
196{
197 UDP_HSLOT_MAIN(hslot2)->hash4_cnt++;
198}
199
200static inline void udp_hash4_dec(struct udp_hslot *hslot2)
201{
202 UDP_HSLOT_MAIN(hslot2)->hash4_cnt--;
203}
204#endif /* CONFIG_BASE_SMALL */
205
206extern struct proto udp_prot;
207
208extern atomic_long_t udp_memory_allocated;
209DECLARE_PER_CPU(int, udp_memory_per_cpu_fw_alloc);
210
211/* sysctl variables for udp */
212extern long sysctl_udp_mem[3];
213extern int sysctl_udp_rmem_min;
214extern int sysctl_udp_wmem_min;
215
216struct sk_buff;
217
218/*
219 * Generic checksumming routines for UDP(-Lite) v4 and v6
220 */
221static inline __sum16 __udp_lib_checksum_complete(struct sk_buff *skb)
222{
223 return (UDP_SKB_CB(skb)->cscov == skb->len ?
224 __skb_checksum_complete(skb) :
225 __skb_checksum_complete_head(skb, UDP_SKB_CB(skb)->cscov));
226}
227
228static inline int udp_lib_checksum_complete(struct sk_buff *skb)
229{
230 return !skb_csum_unnecessary(skb) &&
231 __udp_lib_checksum_complete(skb);
232}
233
234/**
235 * udp_csum_outgoing - compute UDPv4/v6 checksum over fragments
236 * @sk: socket we are writing to
237 * @skb: sk_buff containing the filled-in UDP header
238 * (checksum field must be zeroed out)
239 */
240static inline __wsum udp_csum_outgoing(struct sock *sk, struct sk_buff *skb)
241{
242 __wsum csum = csum_partial(buff: skb_transport_header(skb),
243 len: sizeof(struct udphdr), sum: 0);
244 skb_queue_walk(&sk->sk_write_queue, skb) {
245 csum = csum_add(csum, addend: skb->csum);
246 }
247 return csum;
248}
249
250static inline __wsum udp_csum(struct sk_buff *skb)
251{
252 __wsum csum = csum_partial(buff: skb_transport_header(skb),
253 len: sizeof(struct udphdr), sum: skb->csum);
254
255 for (skb = skb_shinfo(skb)->frag_list; skb; skb = skb->next) {
256 csum = csum_add(csum, addend: skb->csum);
257 }
258 return csum;
259}
260
261static inline __sum16 udp_v4_check(int len, __be32 saddr,
262 __be32 daddr, __wsum base)
263{
264 return csum_tcpudp_magic(saddr, daddr, len, IPPROTO_UDP, sum: base);
265}
266
267void udp_set_csum(bool nocheck, struct sk_buff *skb,
268 __be32 saddr, __be32 daddr, int len);
269
270static inline void udp_csum_pull_header(struct sk_buff *skb)
271{
272 if (!skb->csum_valid && skb->ip_summed == CHECKSUM_NONE)
273 skb->csum = csum_partial(buff: skb->data, len: sizeof(struct udphdr),
274 sum: skb->csum);
275 skb_pull_rcsum(skb, len: sizeof(struct udphdr));
276 UDP_SKB_CB(skb)->cscov -= sizeof(struct udphdr);
277}
278
279typedef struct sock *(*udp_lookup_t)(const struct sk_buff *skb, __be16 sport,
280 __be16 dport);
281
282void udp_v6_early_demux(struct sk_buff *skb);
283INDIRECT_CALLABLE_DECLARE(int udpv6_rcv(struct sk_buff *));
284
285struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
286 netdev_features_t features, bool is_ipv6);
287
288static inline void udp_lib_init_sock(struct sock *sk)
289{
290 struct udp_sock *up = udp_sk(sk);
291
292 skb_queue_head_init(list: &up->reader_queue);
293 INIT_HLIST_NODE(h: &up->tunnel_list);
294 up->forward_threshold = sk->sk_rcvbuf >> 2;
295 set_bit(nr: SOCK_CUSTOM_SOCKOPT, addr: &sk->sk_socket->flags);
296}
297
298/* hash routines shared between UDPv4/6 and UDP-Litev4/6 */
299static inline int udp_lib_hash(struct sock *sk)
300{
301 BUG();
302 return 0;
303}
304
305void udp_lib_unhash(struct sock *sk);
306void udp_lib_rehash(struct sock *sk, u16 new_hash, u16 new_hash4);
307u32 udp_ehashfn(const struct net *net, const __be32 laddr, const __u16 lport,
308 const __be32 faddr, const __be16 fport);
309
310static inline void udp_lib_close(struct sock *sk, long timeout)
311{
312 sk_common_release(sk);
313}
314
315/* hash4 routines shared between UDPv4/6 */
316#if IS_ENABLED(CONFIG_BASE_SMALL)
317static inline void udp_lib_hash4(struct sock *sk, u16 hash)
318{
319}
320
321static inline void udp4_hash4(struct sock *sk)
322{
323}
324#else /* !CONFIG_BASE_SMALL */
325void udp_lib_hash4(struct sock *sk, u16 hash);
326void udp4_hash4(struct sock *sk);
327#endif /* CONFIG_BASE_SMALL */
328
329int udp_lib_get_port(struct sock *sk, unsigned short snum,
330 unsigned int hash2_nulladdr);
331
332u32 udp_flow_hashrnd(void);
333
334static inline __be16 udp_flow_src_port(struct net *net, struct sk_buff *skb,
335 int min, int max, bool use_eth)
336{
337 u32 hash;
338
339 if (min >= max) {
340 /* Use default range */
341 inet_get_local_port_range(net, low: &min, high: &max);
342 }
343
344 hash = skb_get_hash(skb);
345 if (unlikely(!hash)) {
346 if (use_eth) {
347 /* Can't find a normal hash, caller has indicated an
348 * Ethernet packet so use that to compute a hash.
349 */
350 hash = jhash(key: skb->data, length: 2 * ETH_ALEN,
351 initval: (__force u32) skb->protocol);
352 } else {
353 /* Can't derive any sort of hash for the packet, set
354 * to some consistent random value.
355 */
356 hash = udp_flow_hashrnd();
357 }
358 }
359
360 /* Since this is being sent on the wire obfuscate hash a bit
361 * to minimize possibility that any useful information to an
362 * attacker is leaked. Only upper 16 bits are relevant in the
363 * computation for 16 bit port value.
364 */
365 hash ^= hash << 16;
366
367 return htons((((u64) hash * (max - min)) >> 32) + min);
368}
369
370static inline int udp_rqueue_get(struct sock *sk)
371{
372 return sk_rmem_alloc_get(sk) - READ_ONCE(udp_sk(sk)->forward_deficit);
373}
374
375static inline bool udp_sk_bound_dev_eq(const struct net *net, int bound_dev_if,
376 int dif, int sdif)
377{
378#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
379 return inet_bound_dev_eq(l3mdev_accept: !!READ_ONCE(net->ipv4.sysctl_udp_l3mdev_accept),
380 bound_dev_if, dif, sdif);
381#else
382 return inet_bound_dev_eq(true, bound_dev_if, dif, sdif);
383#endif
384}
385
386/* net/ipv4/udp.c */
387void udp_destruct_common(struct sock *sk);
388void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len);
389int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb);
390void udp_skb_destructor(struct sock *sk, struct sk_buff *skb);
391struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags, int *off,
392 int *err);
393static inline struct sk_buff *skb_recv_udp(struct sock *sk, unsigned int flags,
394 int *err)
395{
396 int off = 0;
397
398 return __skb_recv_udp(sk, flags, off: &off, err);
399}
400
401int udp_v4_early_demux(struct sk_buff *skb);
402bool udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst);
403int udp_err(struct sk_buff *, u32);
404int udp_abort(struct sock *sk, int err);
405int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len);
406void udp_splice_eof(struct socket *sock);
407int udp_push_pending_frames(struct sock *sk);
408void udp_flush_pending_frames(struct sock *sk);
409int udp_cmsg_send(struct sock *sk, struct msghdr *msg, u16 *gso_size);
410void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst);
411int udp_rcv(struct sk_buff *skb);
412int udp_ioctl(struct sock *sk, int cmd, int *karg);
413int udp_init_sock(struct sock *sk);
414int udp_pre_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len);
415int __udp_disconnect(struct sock *sk, int flags);
416int udp_disconnect(struct sock *sk, int flags);
417__poll_t udp_poll(struct file *file, struct socket *sock, poll_table *wait);
418struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
419 netdev_features_t features,
420 bool is_ipv6);
421int udp_lib_getsockopt(struct sock *sk, int level, int optname,
422 char __user *optval, int __user *optlen);
423int udp_lib_setsockopt(struct sock *sk, int level, int optname,
424 sockptr_t optval, unsigned int optlen,
425 int (*push_pending_frames)(struct sock *));
426struct sock *udp4_lib_lookup(const struct net *net, __be32 saddr, __be16 sport,
427 __be32 daddr, __be16 dport, int dif);
428struct sock *__udp4_lib_lookup(const struct net *net, __be32 saddr,
429 __be16 sport,
430 __be32 daddr, __be16 dport, int dif, int sdif,
431 struct udp_table *tbl, struct sk_buff *skb);
432struct sock *udp4_lib_lookup_skb(const struct sk_buff *skb,
433 __be16 sport, __be16 dport);
434struct sock *udp6_lib_lookup(const struct net *net,
435 const struct in6_addr *saddr, __be16 sport,
436 const struct in6_addr *daddr, __be16 dport,
437 int dif);
438struct sock *__udp6_lib_lookup(const struct net *net,
439 const struct in6_addr *saddr, __be16 sport,
440 const struct in6_addr *daddr, __be16 dport,
441 int dif, int sdif, struct udp_table *tbl,
442 struct sk_buff *skb);
443struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb,
444 __be16 sport, __be16 dport);
445int udp_read_skb(struct sock *sk, skb_read_actor_t recv_actor);
446
447/* UDP uses skb->dev_scratch to cache as much information as possible and avoid
448 * possibly multiple cache miss on dequeue()
449 */
450struct udp_dev_scratch {
451 /* skb->truesize and the stateless bit are embedded in a single field;
452 * do not use a bitfield since the compiler emits better/smaller code
453 * this way
454 */
455 u32 _tsize_state;
456
457#if BITS_PER_LONG == 64
458 /* len and the bit needed to compute skb_csum_unnecessary
459 * will be on cold cache lines at recvmsg time.
460 * skb->len can be stored on 16 bits since the udp header has been
461 * already validated and pulled.
462 */
463 u16 len;
464 bool is_linear;
465 bool csum_unnecessary;
466#endif
467};
468
469static inline struct udp_dev_scratch *udp_skb_scratch(struct sk_buff *skb)
470{
471 return (struct udp_dev_scratch *)&skb->dev_scratch;
472}
473
474#if BITS_PER_LONG == 64
475static inline unsigned int udp_skb_len(struct sk_buff *skb)
476{
477 return udp_skb_scratch(skb)->len;
478}
479
480static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb)
481{
482 return udp_skb_scratch(skb)->csum_unnecessary;
483}
484
485static inline bool udp_skb_is_linear(struct sk_buff *skb)
486{
487 return udp_skb_scratch(skb)->is_linear;
488}
489
490#else
491static inline unsigned int udp_skb_len(struct sk_buff *skb)
492{
493 return skb->len;
494}
495
496static inline bool udp_skb_csum_unnecessary(struct sk_buff *skb)
497{
498 return skb_csum_unnecessary(skb);
499}
500
501static inline bool udp_skb_is_linear(struct sk_buff *skb)
502{
503 return !skb_is_nonlinear(skb);
504}
505#endif
506
507static inline int copy_linear_skb(struct sk_buff *skb, int len, int off,
508 struct iov_iter *to)
509{
510 return copy_to_iter_full(addr: skb->data + off, bytes: len, i: to) ? 0 : -EFAULT;
511}
512
513/*
514 * SNMP statistics for UDP and UDP-Lite
515 */
516#define UDP_INC_STATS(net, field, is_udplite) do { \
517 if (is_udplite) SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
518 else SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
519#define __UDP_INC_STATS(net, field, is_udplite) do { \
520 if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_statistics, field); \
521 else __SNMP_INC_STATS((net)->mib.udp_statistics, field); } while(0)
522
523#define __UDP6_INC_STATS(net, field, is_udplite) do { \
524 if (is_udplite) __SNMP_INC_STATS((net)->mib.udplite_stats_in6, field);\
525 else __SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
526} while(0)
527#define UDP6_INC_STATS(net, field, __lite) do { \
528 if (__lite) SNMP_INC_STATS((net)->mib.udplite_stats_in6, field); \
529 else SNMP_INC_STATS((net)->mib.udp_stats_in6, field); \
530} while(0)
531
532#if IS_ENABLED(CONFIG_IPV6)
533#define __UDPX_MIB(sk, ipv4) \
534({ \
535 ipv4 ? (IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_statistics : \
536 sock_net(sk)->mib.udp_statistics) : \
537 (IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_stats_in6 : \
538 sock_net(sk)->mib.udp_stats_in6); \
539})
540#else
541#define __UDPX_MIB(sk, ipv4) \
542({ \
543 IS_UDPLITE(sk) ? sock_net(sk)->mib.udplite_statistics : \
544 sock_net(sk)->mib.udp_statistics; \
545})
546#endif
547
548#define __UDPX_INC_STATS(sk, field) \
549 __SNMP_INC_STATS(__UDPX_MIB(sk, (sk)->sk_family == AF_INET), field)
550
551#ifdef CONFIG_PROC_FS
552struct udp_seq_afinfo {
553 sa_family_t family;
554 struct udp_table *udp_table;
555};
556
557struct udp_iter_state {
558 struct seq_net_private p;
559 int bucket;
560};
561
562void *udp_seq_start(struct seq_file *seq, loff_t *pos);
563void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos);
564void udp_seq_stop(struct seq_file *seq, void *v);
565
566extern const struct seq_operations udp_seq_ops;
567extern const struct seq_operations udp6_seq_ops;
568
569int udp4_proc_init(void);
570void udp4_proc_exit(void);
571#endif /* CONFIG_PROC_FS */
572
573int udpv4_offload_init(void);
574
575void udp_init(void);
576
577DECLARE_STATIC_KEY_FALSE(udp_encap_needed_key);
578void udp_encap_enable(void);
579void udp_encap_disable(void);
580#if IS_ENABLED(CONFIG_IPV6)
581DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key);
582void udpv6_encap_enable(void);
583#endif
584
585static inline struct sk_buff *udp_rcv_segment(struct sock *sk,
586 struct sk_buff *skb, bool ipv4)
587{
588 netdev_features_t features = NETIF_F_SG;
589 struct sk_buff *segs;
590
591 /* Avoid csum recalculation by skb_segment unless userspace explicitly
592 * asks for the final checksum values
593 */
594 if (!inet_get_convert_csum(sk))
595 features |= NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
596
597 /* UDP segmentation expects packets of type CHECKSUM_PARTIAL or
598 * CHECKSUM_NONE in __udp_gso_segment. UDP GRO indeed builds partial
599 * packets in udp_gro_complete_segment. As does UDP GSO, verified by
600 * udp_send_skb. But when those packets are looped in dev_loopback_xmit
601 * their ip_summed CHECKSUM_NONE is changed to CHECKSUM_UNNECESSARY.
602 * Reset in this specific case, where PARTIAL is both correct and
603 * required.
604 */
605 if (skb->pkt_type == PACKET_LOOPBACK)
606 skb->ip_summed = CHECKSUM_PARTIAL;
607
608 /* the GSO CB lays after the UDP one, no need to save and restore any
609 * CB fragment
610 */
611 segs = __skb_gso_segment(skb, features, tx_path: false);
612 if (IS_ERR_OR_NULL(ptr: segs)) {
613 int segs_nr = skb_shinfo(skb)->gso_segs;
614
615 atomic_add(i: segs_nr, v: &sk->sk_drops);
616 SNMP_ADD_STATS(__UDPX_MIB(sk, ipv4), UDP_MIB_INERRORS, segs_nr);
617 kfree_skb(skb);
618 return NULL;
619 }
620
621 consume_skb(skb);
622 return segs;
623}
624
625static inline void udp_post_segment_fix_csum(struct sk_buff *skb)
626{
627 /* UDP-lite can't land here - no GRO */
628 WARN_ON_ONCE(UDP_SKB_CB(skb)->partial_cov);
629
630 /* UDP packets generated with UDP_SEGMENT and traversing:
631 *
632 * UDP tunnel(xmit) -> veth (segmentation) -> veth (gro) -> UDP tunnel (rx)
633 *
634 * can reach an UDP socket with CHECKSUM_NONE, because
635 * __iptunnel_pull_header() converts CHECKSUM_PARTIAL into NONE.
636 * SKB_GSO_UDP_L4 or SKB_GSO_FRAGLIST packets with no UDP tunnel will
637 * have a valid checksum, as the GRO engine validates the UDP csum
638 * before the aggregation and nobody strips such info in between.
639 * Instead of adding another check in the tunnel fastpath, we can force
640 * a valid csum after the segmentation.
641 * Additionally fixup the UDP CB.
642 */
643 UDP_SKB_CB(skb)->cscov = skb->len;
644 if (skb->ip_summed == CHECKSUM_NONE && !skb->csum_valid)
645 skb->csum_valid = 1;
646}
647
648#ifdef CONFIG_BPF_SYSCALL
649struct sk_psock;
650int udp_bpf_update_proto(struct sock *sk, struct sk_psock *psock, bool restore);
651#endif
652
653#endif /* _UDP_H */
654

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source code of linux/include/net/udp.h