This source file includes following definitions.
- udp_lib_lport_inuse
- udp_lib_lport_inuse2
- udp_reuseport_add_sock
- udp_lib_get_port
- udp_v4_get_port
- compute_score
- udp_ehashfn
- udp4_lib_lookup2
- __udp4_lib_lookup
- __udp4_lib_lookup_skb
- udp4_lib_lookup_skb
- udp4_lib_lookup
- __udp_is_mcast_sock
- udp_encap_enable
- __udp4_lib_err_encap_no_sk
- __udp4_lib_err_encap
- __udp4_lib_err
- udp_err
- udp_flush_pending_frames
- udp4_hwcsum
- udp_set_csum
- udp_send_skb
- udp_push_pending_frames
- __udp_cmsg_send
- udp_cmsg_send
- udp_sendmsg
- udp_sendpage
- udp_try_make_stateless
- udp_set_dev_scratch
- udp_skb_csum_unnecessary_set
- udp_skb_truesize
- udp_skb_has_head_state
- udp_rmem_release
- udp_skb_destructor
- udp_skb_dtor_locked
- busylock_acquire
- busylock_release
- __udp_enqueue_schedule_skb
- udp_destruct_sock
- udp_init_sock
- skb_consume_udp
- __first_packet_length
- first_packet_length
- udp_ioctl
- __skb_recv_udp
- udp_recvmsg
- udp_pre_connect
- __udp_disconnect
- udp_disconnect
- udp_lib_unhash
- udp_lib_rehash
- udp_v4_rehash
- __udp_queue_rcv_skb
- udp_queue_rcv_one_skb
- udp_queue_rcv_skb
- udp_sk_rx_dst_set
- __udp4_lib_mcast_deliver
- udp4_csum_init
- udp_unicast_rcv_skb
- __udp4_lib_rcv
- __udp4_lib_mcast_demux_lookup
- __udp4_lib_demux_lookup
- udp_v4_early_demux
- udp_rcv
- udp_destroy_sock
- udp_lib_setsockopt
- udp_setsockopt
- compat_udp_setsockopt
- udp_lib_getsockopt
- udp_getsockopt
- compat_udp_getsockopt
- udp_poll
- udp_abort
- udp_get_first
- udp_get_next
- udp_get_idx
- udp_seq_start
- udp_seq_next
- udp_seq_stop
- udp4_format_sock
- udp4_seq_show
- udp4_proc_init_net
- udp4_proc_exit_net
- udp4_proc_init
- udp4_proc_exit
- set_uhash_entries
- udp_table_init
- udp_flow_hashrnd
- __udp_sysctl_init
- udp_sysctl_init
- udp_init
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75 #define pr_fmt(fmt) "UDP: " fmt
76
77 #include <linux/uaccess.h>
78 #include <asm/ioctls.h>
79 #include <linux/memblock.h>
80 #include <linux/highmem.h>
81 #include <linux/swap.h>
82 #include <linux/types.h>
83 #include <linux/fcntl.h>
84 #include <linux/module.h>
85 #include <linux/socket.h>
86 #include <linux/sockios.h>
87 #include <linux/igmp.h>
88 #include <linux/inetdevice.h>
89 #include <linux/in.h>
90 #include <linux/errno.h>
91 #include <linux/timer.h>
92 #include <linux/mm.h>
93 #include <linux/inet.h>
94 #include <linux/netdevice.h>
95 #include <linux/slab.h>
96 #include <net/tcp_states.h>
97 #include <linux/skbuff.h>
98 #include <linux/proc_fs.h>
99 #include <linux/seq_file.h>
100 #include <net/net_namespace.h>
101 #include <net/icmp.h>
102 #include <net/inet_hashtables.h>
103 #include <net/ip_tunnels.h>
104 #include <net/route.h>
105 #include <net/checksum.h>
106 #include <net/xfrm.h>
107 #include <trace/events/udp.h>
108 #include <linux/static_key.h>
109 #include <trace/events/skb.h>
110 #include <net/busy_poll.h>
111 #include "udp_impl.h"
112 #include <net/sock_reuseport.h>
113 #include <net/addrconf.h>
114 #include <net/udp_tunnel.h>
115
116 struct udp_table udp_table __read_mostly;
117 EXPORT_SYMBOL(udp_table);
118
119 long sysctl_udp_mem[3] __read_mostly;
120 EXPORT_SYMBOL(sysctl_udp_mem);
121
122 atomic_long_t udp_memory_allocated;
123 EXPORT_SYMBOL(udp_memory_allocated);
124
125 #define MAX_UDP_PORTS 65536
126 #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN)
127
128 static int udp_lib_lport_inuse(struct net *net, __u16 num,
129 const struct udp_hslot *hslot,
130 unsigned long *bitmap,
131 struct sock *sk, unsigned int log)
132 {
133 struct sock *sk2;
134 kuid_t uid = sock_i_uid(sk);
135
136 sk_for_each(sk2, &hslot->head) {
137 if (net_eq(sock_net(sk2), net) &&
138 sk2 != sk &&
139 (bitmap || udp_sk(sk2)->udp_port_hash == num) &&
140 (!sk2->sk_reuse || !sk->sk_reuse) &&
141 (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
142 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
143 inet_rcv_saddr_equal(sk, sk2, true)) {
144 if (sk2->sk_reuseport && sk->sk_reuseport &&
145 !rcu_access_pointer(sk->sk_reuseport_cb) &&
146 uid_eq(uid, sock_i_uid(sk2))) {
147 if (!bitmap)
148 return 0;
149 } else {
150 if (!bitmap)
151 return 1;
152 __set_bit(udp_sk(sk2)->udp_port_hash >> log,
153 bitmap);
154 }
155 }
156 }
157 return 0;
158 }
159
160
161
162
163
164 static int udp_lib_lport_inuse2(struct net *net, __u16 num,
165 struct udp_hslot *hslot2,
166 struct sock *sk)
167 {
168 struct sock *sk2;
169 kuid_t uid = sock_i_uid(sk);
170 int res = 0;
171
172 spin_lock(&hslot2->lock);
173 udp_portaddr_for_each_entry(sk2, &hslot2->head) {
174 if (net_eq(sock_net(sk2), net) &&
175 sk2 != sk &&
176 (udp_sk(sk2)->udp_port_hash == num) &&
177 (!sk2->sk_reuse || !sk->sk_reuse) &&
178 (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
179 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
180 inet_rcv_saddr_equal(sk, sk2, true)) {
181 if (sk2->sk_reuseport && sk->sk_reuseport &&
182 !rcu_access_pointer(sk->sk_reuseport_cb) &&
183 uid_eq(uid, sock_i_uid(sk2))) {
184 res = 0;
185 } else {
186 res = 1;
187 }
188 break;
189 }
190 }
191 spin_unlock(&hslot2->lock);
192 return res;
193 }
194
195 static int udp_reuseport_add_sock(struct sock *sk, struct udp_hslot *hslot)
196 {
197 struct net *net = sock_net(sk);
198 kuid_t uid = sock_i_uid(sk);
199 struct sock *sk2;
200
201 sk_for_each(sk2, &hslot->head) {
202 if (net_eq(sock_net(sk2), net) &&
203 sk2 != sk &&
204 sk2->sk_family == sk->sk_family &&
205 ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
206 (udp_sk(sk2)->udp_port_hash == udp_sk(sk)->udp_port_hash) &&
207 (sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
208 sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
209 inet_rcv_saddr_equal(sk, sk2, false)) {
210 return reuseport_add_sock(sk, sk2,
211 inet_rcv_saddr_any(sk));
212 }
213 }
214
215 return reuseport_alloc(sk, inet_rcv_saddr_any(sk));
216 }
217
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225
226 int udp_lib_get_port(struct sock *sk, unsigned short snum,
227 unsigned int hash2_nulladdr)
228 {
229 struct udp_hslot *hslot, *hslot2;
230 struct udp_table *udptable = sk->sk_prot->h.udp_table;
231 int error = 1;
232 struct net *net = sock_net(sk);
233
234 if (!snum) {
235 int low, high, remaining;
236 unsigned int rand;
237 unsigned short first, last;
238 DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN);
239
240 inet_get_local_port_range(net, &low, &high);
241 remaining = (high - low) + 1;
242
243 rand = prandom_u32();
244 first = reciprocal_scale(rand, remaining) + low;
245
246
247
248 rand = (rand | 1) * (udptable->mask + 1);
249 last = first + udptable->mask + 1;
250 do {
251 hslot = udp_hashslot(udptable, net, first);
252 bitmap_zero(bitmap, PORTS_PER_CHAIN);
253 spin_lock_bh(&hslot->lock);
254 udp_lib_lport_inuse(net, snum, hslot, bitmap, sk,
255 udptable->log);
256
257 snum = first;
258
259
260
261
262
263 do {
264 if (low <= snum && snum <= high &&
265 !test_bit(snum >> udptable->log, bitmap) &&
266 !inet_is_local_reserved_port(net, snum))
267 goto found;
268 snum += rand;
269 } while (snum != first);
270 spin_unlock_bh(&hslot->lock);
271 cond_resched();
272 } while (++first != last);
273 goto fail;
274 } else {
275 hslot = udp_hashslot(udptable, net, snum);
276 spin_lock_bh(&hslot->lock);
277 if (hslot->count > 10) {
278 int exist;
279 unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum;
280
281 slot2 &= udptable->mask;
282 hash2_nulladdr &= udptable->mask;
283
284 hslot2 = udp_hashslot2(udptable, slot2);
285 if (hslot->count < hslot2->count)
286 goto scan_primary_hash;
287
288 exist = udp_lib_lport_inuse2(net, snum, hslot2, sk);
289 if (!exist && (hash2_nulladdr != slot2)) {
290 hslot2 = udp_hashslot2(udptable, hash2_nulladdr);
291 exist = udp_lib_lport_inuse2(net, snum, hslot2,
292 sk);
293 }
294 if (exist)
295 goto fail_unlock;
296 else
297 goto found;
298 }
299 scan_primary_hash:
300 if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, 0))
301 goto fail_unlock;
302 }
303 found:
304 inet_sk(sk)->inet_num = snum;
305 udp_sk(sk)->udp_port_hash = snum;
306 udp_sk(sk)->udp_portaddr_hash ^= snum;
307 if (sk_unhashed(sk)) {
308 if (sk->sk_reuseport &&
309 udp_reuseport_add_sock(sk, hslot)) {
310 inet_sk(sk)->inet_num = 0;
311 udp_sk(sk)->udp_port_hash = 0;
312 udp_sk(sk)->udp_portaddr_hash ^= snum;
313 goto fail_unlock;
314 }
315
316 sk_add_node_rcu(sk, &hslot->head);
317 hslot->count++;
318 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
319
320 hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
321 spin_lock(&hslot2->lock);
322 if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
323 sk->sk_family == AF_INET6)
324 hlist_add_tail_rcu(&udp_sk(sk)->udp_portaddr_node,
325 &hslot2->head);
326 else
327 hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
328 &hslot2->head);
329 hslot2->count++;
330 spin_unlock(&hslot2->lock);
331 }
332 sock_set_flag(sk, SOCK_RCU_FREE);
333 error = 0;
334 fail_unlock:
335 spin_unlock_bh(&hslot->lock);
336 fail:
337 return error;
338 }
339 EXPORT_SYMBOL(udp_lib_get_port);
340
341 int udp_v4_get_port(struct sock *sk, unsigned short snum)
342 {
343 unsigned int hash2_nulladdr =
344 ipv4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum);
345 unsigned int hash2_partial =
346 ipv4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0);
347
348
349 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
350 return udp_lib_get_port(sk, snum, hash2_nulladdr);
351 }
352
353 static int compute_score(struct sock *sk, struct net *net,
354 __be32 saddr, __be16 sport,
355 __be32 daddr, unsigned short hnum,
356 int dif, int sdif)
357 {
358 int score;
359 struct inet_sock *inet;
360 bool dev_match;
361
362 if (!net_eq(sock_net(sk), net) ||
363 udp_sk(sk)->udp_port_hash != hnum ||
364 ipv6_only_sock(sk))
365 return -1;
366
367 if (sk->sk_rcv_saddr != daddr)
368 return -1;
369
370 score = (sk->sk_family == PF_INET) ? 2 : 1;
371
372 inet = inet_sk(sk);
373 if (inet->inet_daddr) {
374 if (inet->inet_daddr != saddr)
375 return -1;
376 score += 4;
377 }
378
379 if (inet->inet_dport) {
380 if (inet->inet_dport != sport)
381 return -1;
382 score += 4;
383 }
384
385 dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
386 dif, sdif);
387 if (!dev_match)
388 return -1;
389 score += 4;
390
391 if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id())
392 score++;
393 return score;
394 }
395
396 static u32 udp_ehashfn(const struct net *net, const __be32 laddr,
397 const __u16 lport, const __be32 faddr,
398 const __be16 fport)
399 {
400 static u32 udp_ehash_secret __read_mostly;
401
402 net_get_random_once(&udp_ehash_secret, sizeof(udp_ehash_secret));
403
404 return __inet_ehashfn(laddr, lport, faddr, fport,
405 udp_ehash_secret + net_hash_mix(net));
406 }
407
408
409 static struct sock *udp4_lib_lookup2(struct net *net,
410 __be32 saddr, __be16 sport,
411 __be32 daddr, unsigned int hnum,
412 int dif, int sdif,
413 struct udp_hslot *hslot2,
414 struct sk_buff *skb)
415 {
416 struct sock *sk, *result;
417 int score, badness;
418 u32 hash = 0;
419
420 result = NULL;
421 badness = 0;
422 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
423 score = compute_score(sk, net, saddr, sport,
424 daddr, hnum, dif, sdif);
425 if (score > badness) {
426 if (sk->sk_reuseport &&
427 sk->sk_state != TCP_ESTABLISHED) {
428 hash = udp_ehashfn(net, daddr, hnum,
429 saddr, sport);
430 result = reuseport_select_sock(sk, hash, skb,
431 sizeof(struct udphdr));
432 if (result && !reuseport_has_conns(sk, false))
433 return result;
434 }
435 badness = score;
436 result = sk;
437 }
438 }
439 return result;
440 }
441
442
443
444
445 struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
446 __be16 sport, __be32 daddr, __be16 dport, int dif,
447 int sdif, struct udp_table *udptable, struct sk_buff *skb)
448 {
449 struct sock *result;
450 unsigned short hnum = ntohs(dport);
451 unsigned int hash2, slot2;
452 struct udp_hslot *hslot2;
453
454 hash2 = ipv4_portaddr_hash(net, daddr, hnum);
455 slot2 = hash2 & udptable->mask;
456 hslot2 = &udptable->hash2[slot2];
457
458 result = udp4_lib_lookup2(net, saddr, sport,
459 daddr, hnum, dif, sdif,
460 hslot2, skb);
461 if (!result) {
462 hash2 = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
463 slot2 = hash2 & udptable->mask;
464 hslot2 = &udptable->hash2[slot2];
465
466 result = udp4_lib_lookup2(net, saddr, sport,
467 htonl(INADDR_ANY), hnum, dif, sdif,
468 hslot2, skb);
469 }
470 if (IS_ERR(result))
471 return NULL;
472 return result;
473 }
474 EXPORT_SYMBOL_GPL(__udp4_lib_lookup);
475
476 static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb,
477 __be16 sport, __be16 dport,
478 struct udp_table *udptable)
479 {
480 const struct iphdr *iph = ip_hdr(skb);
481
482 return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport,
483 iph->daddr, dport, inet_iif(skb),
484 inet_sdif(skb), udptable, skb);
485 }
486
487 struct sock *udp4_lib_lookup_skb(struct sk_buff *skb,
488 __be16 sport, __be16 dport)
489 {
490 const struct iphdr *iph = ip_hdr(skb);
491
492 return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport,
493 iph->daddr, dport, inet_iif(skb),
494 inet_sdif(skb), &udp_table, NULL);
495 }
496 EXPORT_SYMBOL_GPL(udp4_lib_lookup_skb);
497
498
499
500
501 #if IS_ENABLED(CONFIG_NF_TPROXY_IPV4) || IS_ENABLED(CONFIG_NF_SOCKET_IPV4)
502 struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
503 __be32 daddr, __be16 dport, int dif)
504 {
505 struct sock *sk;
506
507 sk = __udp4_lib_lookup(net, saddr, sport, daddr, dport,
508 dif, 0, &udp_table, NULL);
509 if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
510 sk = NULL;
511 return sk;
512 }
513 EXPORT_SYMBOL_GPL(udp4_lib_lookup);
514 #endif
515
516 static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk,
517 __be16 loc_port, __be32 loc_addr,
518 __be16 rmt_port, __be32 rmt_addr,
519 int dif, int sdif, unsigned short hnum)
520 {
521 struct inet_sock *inet = inet_sk(sk);
522
523 if (!net_eq(sock_net(sk), net) ||
524 udp_sk(sk)->udp_port_hash != hnum ||
525 (inet->inet_daddr && inet->inet_daddr != rmt_addr) ||
526 (inet->inet_dport != rmt_port && inet->inet_dport) ||
527 (inet->inet_rcv_saddr && inet->inet_rcv_saddr != loc_addr) ||
528 ipv6_only_sock(sk) ||
529 !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif))
530 return false;
531 if (!ip_mc_sf_allow(sk, loc_addr, rmt_addr, dif, sdif))
532 return false;
533 return true;
534 }
535
536 DEFINE_STATIC_KEY_FALSE(udp_encap_needed_key);
537 void udp_encap_enable(void)
538 {
539 static_branch_inc(&udp_encap_needed_key);
540 }
541 EXPORT_SYMBOL(udp_encap_enable);
542
543
544
545
546 static int __udp4_lib_err_encap_no_sk(struct sk_buff *skb, u32 info)
547 {
548 int i;
549
550 for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) {
551 int (*handler)(struct sk_buff *skb, u32 info);
552 const struct ip_tunnel_encap_ops *encap;
553
554 encap = rcu_dereference(iptun_encaps[i]);
555 if (!encap)
556 continue;
557 handler = encap->err_handler;
558 if (handler && !handler(skb, info))
559 return 0;
560 }
561
562 return -ENOENT;
563 }
564
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581
582 static struct sock *__udp4_lib_err_encap(struct net *net,
583 const struct iphdr *iph,
584 struct udphdr *uh,
585 struct udp_table *udptable,
586 struct sk_buff *skb, u32 info)
587 {
588 int network_offset, transport_offset;
589 struct sock *sk;
590
591 network_offset = skb_network_offset(skb);
592 transport_offset = skb_transport_offset(skb);
593
594
595 skb_reset_network_header(skb);
596
597
598 skb_set_transport_header(skb, iph->ihl << 2);
599
600 sk = __udp4_lib_lookup(net, iph->daddr, uh->source,
601 iph->saddr, uh->dest, skb->dev->ifindex, 0,
602 udptable, NULL);
603 if (sk) {
604 int (*lookup)(struct sock *sk, struct sk_buff *skb);
605 struct udp_sock *up = udp_sk(sk);
606
607 lookup = READ_ONCE(up->encap_err_lookup);
608 if (!lookup || lookup(sk, skb))
609 sk = NULL;
610 }
611
612 if (!sk)
613 sk = ERR_PTR(__udp4_lib_err_encap_no_sk(skb, info));
614
615 skb_set_transport_header(skb, transport_offset);
616 skb_set_network_header(skb, network_offset);
617
618 return sk;
619 }
620
621
622
623
624
625
626
627
628
629
630
631
632 int __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable)
633 {
634 struct inet_sock *inet;
635 const struct iphdr *iph = (const struct iphdr *)skb->data;
636 struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2));
637 const int type = icmp_hdr(skb)->type;
638 const int code = icmp_hdr(skb)->code;
639 bool tunnel = false;
640 struct sock *sk;
641 int harderr;
642 int err;
643 struct net *net = dev_net(skb->dev);
644
645 sk = __udp4_lib_lookup(net, iph->daddr, uh->dest,
646 iph->saddr, uh->source, skb->dev->ifindex,
647 inet_sdif(skb), udptable, NULL);
648 if (!sk) {
649
650 sk = ERR_PTR(-ENOENT);
651 if (static_branch_unlikely(&udp_encap_needed_key)) {
652 sk = __udp4_lib_err_encap(net, iph, uh, udptable, skb,
653 info);
654 if (!sk)
655 return 0;
656 }
657
658 if (IS_ERR(sk)) {
659 __ICMP_INC_STATS(net, ICMP_MIB_INERRORS);
660 return PTR_ERR(sk);
661 }
662
663 tunnel = true;
664 }
665
666 err = 0;
667 harderr = 0;
668 inet = inet_sk(sk);
669
670 switch (type) {
671 default:
672 case ICMP_TIME_EXCEEDED:
673 err = EHOSTUNREACH;
674 break;
675 case ICMP_SOURCE_QUENCH:
676 goto out;
677 case ICMP_PARAMETERPROB:
678 err = EPROTO;
679 harderr = 1;
680 break;
681 case ICMP_DEST_UNREACH:
682 if (code == ICMP_FRAG_NEEDED) {
683 ipv4_sk_update_pmtu(skb, sk, info);
684 if (inet->pmtudisc != IP_PMTUDISC_DONT) {
685 err = EMSGSIZE;
686 harderr = 1;
687 break;
688 }
689 goto out;
690 }
691 err = EHOSTUNREACH;
692 if (code <= NR_ICMP_UNREACH) {
693 harderr = icmp_err_convert[code].fatal;
694 err = icmp_err_convert[code].errno;
695 }
696 break;
697 case ICMP_REDIRECT:
698 ipv4_sk_redirect(skb, sk);
699 goto out;
700 }
701
702
703
704
705
706 if (tunnel) {
707
708 goto out;
709 }
710 if (!inet->recverr) {
711 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
712 goto out;
713 } else
714 ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1));
715
716 sk->sk_err = err;
717 sk->sk_error_report(sk);
718 out:
719 return 0;
720 }
721
722 int udp_err(struct sk_buff *skb, u32 info)
723 {
724 return __udp4_lib_err(skb, info, &udp_table);
725 }
726
727
728
729
730 void udp_flush_pending_frames(struct sock *sk)
731 {
732 struct udp_sock *up = udp_sk(sk);
733
734 if (up->pending) {
735 up->len = 0;
736 up->pending = 0;
737 ip_flush_pending_frames(sk);
738 }
739 }
740 EXPORT_SYMBOL(udp_flush_pending_frames);
741
742
743
744
745
746
747
748
749 void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst)
750 {
751 struct udphdr *uh = udp_hdr(skb);
752 int offset = skb_transport_offset(skb);
753 int len = skb->len - offset;
754 int hlen = len;
755 __wsum csum = 0;
756
757 if (!skb_has_frag_list(skb)) {
758
759
760
761 skb->csum_start = skb_transport_header(skb) - skb->head;
762 skb->csum_offset = offsetof(struct udphdr, check);
763 uh->check = ~csum_tcpudp_magic(src, dst, len,
764 IPPROTO_UDP, 0);
765 } else {
766 struct sk_buff *frags;
767
768
769
770
771
772
773 skb_walk_frags(skb, frags) {
774 csum = csum_add(csum, frags->csum);
775 hlen -= frags->len;
776 }
777
778 csum = skb_checksum(skb, offset, hlen, csum);
779 skb->ip_summed = CHECKSUM_NONE;
780
781 uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
782 if (uh->check == 0)
783 uh->check = CSUM_MANGLED_0;
784 }
785 }
786 EXPORT_SYMBOL_GPL(udp4_hwcsum);
787
788
789
790
791 void udp_set_csum(bool nocheck, struct sk_buff *skb,
792 __be32 saddr, __be32 daddr, int len)
793 {
794 struct udphdr *uh = udp_hdr(skb);
795
796 if (nocheck) {
797 uh->check = 0;
798 } else if (skb_is_gso(skb)) {
799 uh->check = ~udp_v4_check(len, saddr, daddr, 0);
800 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
801 uh->check = 0;
802 uh->check = udp_v4_check(len, saddr, daddr, lco_csum(skb));
803 if (uh->check == 0)
804 uh->check = CSUM_MANGLED_0;
805 } else {
806 skb->ip_summed = CHECKSUM_PARTIAL;
807 skb->csum_start = skb_transport_header(skb) - skb->head;
808 skb->csum_offset = offsetof(struct udphdr, check);
809 uh->check = ~udp_v4_check(len, saddr, daddr, 0);
810 }
811 }
812 EXPORT_SYMBOL(udp_set_csum);
813
814 static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4,
815 struct inet_cork *cork)
816 {
817 struct sock *sk = skb->sk;
818 struct inet_sock *inet = inet_sk(sk);
819 struct udphdr *uh;
820 int err = 0;
821 int is_udplite = IS_UDPLITE(sk);
822 int offset = skb_transport_offset(skb);
823 int len = skb->len - offset;
824 int datalen = len - sizeof(*uh);
825 __wsum csum = 0;
826
827
828
829
830 uh = udp_hdr(skb);
831 uh->source = inet->inet_sport;
832 uh->dest = fl4->fl4_dport;
833 uh->len = htons(len);
834 uh->check = 0;
835
836 if (cork->gso_size) {
837 const int hlen = skb_network_header_len(skb) +
838 sizeof(struct udphdr);
839
840 if (hlen + cork->gso_size > cork->fragsize) {
841 kfree_skb(skb);
842 return -EINVAL;
843 }
844 if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) {
845 kfree_skb(skb);
846 return -EINVAL;
847 }
848 if (sk->sk_no_check_tx) {
849 kfree_skb(skb);
850 return -EINVAL;
851 }
852 if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite ||
853 dst_xfrm(skb_dst(skb))) {
854 kfree_skb(skb);
855 return -EIO;
856 }
857
858 if (datalen > cork->gso_size) {
859 skb_shinfo(skb)->gso_size = cork->gso_size;
860 skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4;
861 skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen,
862 cork->gso_size);
863 }
864 goto csum_partial;
865 }
866
867 if (is_udplite)
868 csum = udplite_csum(skb);
869
870 else if (sk->sk_no_check_tx) {
871
872 skb->ip_summed = CHECKSUM_NONE;
873 goto send;
874
875 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
876 csum_partial:
877
878 udp4_hwcsum(skb, fl4->saddr, fl4->daddr);
879 goto send;
880
881 } else
882 csum = udp_csum(skb);
883
884
885 uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len,
886 sk->sk_protocol, csum);
887 if (uh->check == 0)
888 uh->check = CSUM_MANGLED_0;
889
890 send:
891 err = ip_send_skb(sock_net(sk), skb);
892 if (err) {
893 if (err == -ENOBUFS && !inet->recverr) {
894 UDP_INC_STATS(sock_net(sk),
895 UDP_MIB_SNDBUFERRORS, is_udplite);
896 err = 0;
897 }
898 } else
899 UDP_INC_STATS(sock_net(sk),
900 UDP_MIB_OUTDATAGRAMS, is_udplite);
901 return err;
902 }
903
904
905
906
907 int udp_push_pending_frames(struct sock *sk)
908 {
909 struct udp_sock *up = udp_sk(sk);
910 struct inet_sock *inet = inet_sk(sk);
911 struct flowi4 *fl4 = &inet->cork.fl.u.ip4;
912 struct sk_buff *skb;
913 int err = 0;
914
915 skb = ip_finish_skb(sk, fl4);
916 if (!skb)
917 goto out;
918
919 err = udp_send_skb(skb, fl4, &inet->cork.base);
920
921 out:
922 up->len = 0;
923 up->pending = 0;
924 return err;
925 }
926 EXPORT_SYMBOL(udp_push_pending_frames);
927
928 static int __udp_cmsg_send(struct cmsghdr *cmsg, u16 *gso_size)
929 {
930 switch (cmsg->cmsg_type) {
931 case UDP_SEGMENT:
932 if (cmsg->cmsg_len != CMSG_LEN(sizeof(__u16)))
933 return -EINVAL;
934 *gso_size = *(__u16 *)CMSG_DATA(cmsg);
935 return 0;
936 default:
937 return -EINVAL;
938 }
939 }
940
941 int udp_cmsg_send(struct sock *sk, struct msghdr *msg, u16 *gso_size)
942 {
943 struct cmsghdr *cmsg;
944 bool need_ip = false;
945 int err;
946
947 for_each_cmsghdr(cmsg, msg) {
948 if (!CMSG_OK(msg, cmsg))
949 return -EINVAL;
950
951 if (cmsg->cmsg_level != SOL_UDP) {
952 need_ip = true;
953 continue;
954 }
955
956 err = __udp_cmsg_send(cmsg, gso_size);
957 if (err)
958 return err;
959 }
960
961 return need_ip;
962 }
963 EXPORT_SYMBOL_GPL(udp_cmsg_send);
964
965 int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
966 {
967 struct inet_sock *inet = inet_sk(sk);
968 struct udp_sock *up = udp_sk(sk);
969 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
970 struct flowi4 fl4_stack;
971 struct flowi4 *fl4;
972 int ulen = len;
973 struct ipcm_cookie ipc;
974 struct rtable *rt = NULL;
975 int free = 0;
976 int connected = 0;
977 __be32 daddr, faddr, saddr;
978 __be16 dport;
979 u8 tos;
980 int err, is_udplite = IS_UDPLITE(sk);
981 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
982 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
983 struct sk_buff *skb;
984 struct ip_options_data opt_copy;
985
986 if (len > 0xFFFF)
987 return -EMSGSIZE;
988
989
990
991
992
993 if (msg->msg_flags & MSG_OOB)
994 return -EOPNOTSUPP;
995
996 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
997
998 fl4 = &inet->cork.fl.u.ip4;
999 if (up->pending) {
1000
1001
1002
1003
1004 lock_sock(sk);
1005 if (likely(up->pending)) {
1006 if (unlikely(up->pending != AF_INET)) {
1007 release_sock(sk);
1008 return -EINVAL;
1009 }
1010 goto do_append_data;
1011 }
1012 release_sock(sk);
1013 }
1014 ulen += sizeof(struct udphdr);
1015
1016
1017
1018
1019 if (usin) {
1020 if (msg->msg_namelen < sizeof(*usin))
1021 return -EINVAL;
1022 if (usin->sin_family != AF_INET) {
1023 if (usin->sin_family != AF_UNSPEC)
1024 return -EAFNOSUPPORT;
1025 }
1026
1027 daddr = usin->sin_addr.s_addr;
1028 dport = usin->sin_port;
1029 if (dport == 0)
1030 return -EINVAL;
1031 } else {
1032 if (sk->sk_state != TCP_ESTABLISHED)
1033 return -EDESTADDRREQ;
1034 daddr = inet->inet_daddr;
1035 dport = inet->inet_dport;
1036
1037
1038
1039 connected = 1;
1040 }
1041
1042 ipcm_init_sk(&ipc, inet);
1043 ipc.gso_size = up->gso_size;
1044
1045 if (msg->msg_controllen) {
1046 err = udp_cmsg_send(sk, msg, &ipc.gso_size);
1047 if (err > 0)
1048 err = ip_cmsg_send(sk, msg, &ipc,
1049 sk->sk_family == AF_INET6);
1050 if (unlikely(err < 0)) {
1051 kfree(ipc.opt);
1052 return err;
1053 }
1054 if (ipc.opt)
1055 free = 1;
1056 connected = 0;
1057 }
1058 if (!ipc.opt) {
1059 struct ip_options_rcu *inet_opt;
1060
1061 rcu_read_lock();
1062 inet_opt = rcu_dereference(inet->inet_opt);
1063 if (inet_opt) {
1064 memcpy(&opt_copy, inet_opt,
1065 sizeof(*inet_opt) + inet_opt->opt.optlen);
1066 ipc.opt = &opt_copy.opt;
1067 }
1068 rcu_read_unlock();
1069 }
1070
1071 if (cgroup_bpf_enabled && !connected) {
1072 err = BPF_CGROUP_RUN_PROG_UDP4_SENDMSG_LOCK(sk,
1073 (struct sockaddr *)usin, &ipc.addr);
1074 if (err)
1075 goto out_free;
1076 if (usin) {
1077 if (usin->sin_port == 0) {
1078
1079 err = -EINVAL;
1080 goto out_free;
1081 }
1082 daddr = usin->sin_addr.s_addr;
1083 dport = usin->sin_port;
1084 }
1085 }
1086
1087 saddr = ipc.addr;
1088 ipc.addr = faddr = daddr;
1089
1090 if (ipc.opt && ipc.opt->opt.srr) {
1091 if (!daddr) {
1092 err = -EINVAL;
1093 goto out_free;
1094 }
1095 faddr = ipc.opt->opt.faddr;
1096 connected = 0;
1097 }
1098 tos = get_rttos(&ipc, inet);
1099 if (sock_flag(sk, SOCK_LOCALROUTE) ||
1100 (msg->msg_flags & MSG_DONTROUTE) ||
1101 (ipc.opt && ipc.opt->opt.is_strictroute)) {
1102 tos |= RTO_ONLINK;
1103 connected = 0;
1104 }
1105
1106 if (ipv4_is_multicast(daddr)) {
1107 if (!ipc.oif || netif_index_is_l3_master(sock_net(sk), ipc.oif))
1108 ipc.oif = inet->mc_index;
1109 if (!saddr)
1110 saddr = inet->mc_addr;
1111 connected = 0;
1112 } else if (!ipc.oif) {
1113 ipc.oif = inet->uc_index;
1114 } else if (ipv4_is_lbcast(daddr) && inet->uc_index) {
1115
1116
1117
1118
1119
1120
1121 if (ipc.oif != inet->uc_index &&
1122 ipc.oif == l3mdev_master_ifindex_by_index(sock_net(sk),
1123 inet->uc_index)) {
1124 ipc.oif = inet->uc_index;
1125 }
1126 }
1127
1128 if (connected)
1129 rt = (struct rtable *)sk_dst_check(sk, 0);
1130
1131 if (!rt) {
1132 struct net *net = sock_net(sk);
1133 __u8 flow_flags = inet_sk_flowi_flags(sk);
1134
1135 fl4 = &fl4_stack;
1136
1137 flowi4_init_output(fl4, ipc.oif, ipc.sockc.mark, tos,
1138 RT_SCOPE_UNIVERSE, sk->sk_protocol,
1139 flow_flags,
1140 faddr, saddr, dport, inet->inet_sport,
1141 sk->sk_uid);
1142
1143 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
1144 rt = ip_route_output_flow(net, fl4, sk);
1145 if (IS_ERR(rt)) {
1146 err = PTR_ERR(rt);
1147 rt = NULL;
1148 if (err == -ENETUNREACH)
1149 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
1150 goto out;
1151 }
1152
1153 err = -EACCES;
1154 if ((rt->rt_flags & RTCF_BROADCAST) &&
1155 !sock_flag(sk, SOCK_BROADCAST))
1156 goto out;
1157 if (connected)
1158 sk_dst_set(sk, dst_clone(&rt->dst));
1159 }
1160
1161 if (msg->msg_flags&MSG_CONFIRM)
1162 goto do_confirm;
1163 back_from_confirm:
1164
1165 saddr = fl4->saddr;
1166 if (!ipc.addr)
1167 daddr = ipc.addr = fl4->daddr;
1168
1169
1170 if (!corkreq) {
1171 struct inet_cork cork;
1172
1173 skb = ip_make_skb(sk, fl4, getfrag, msg, ulen,
1174 sizeof(struct udphdr), &ipc, &rt,
1175 &cork, msg->msg_flags);
1176 err = PTR_ERR(skb);
1177 if (!IS_ERR_OR_NULL(skb))
1178 err = udp_send_skb(skb, fl4, &cork);
1179 goto out;
1180 }
1181
1182 lock_sock(sk);
1183 if (unlikely(up->pending)) {
1184
1185
1186 release_sock(sk);
1187
1188 net_dbg_ratelimited("socket already corked\n");
1189 err = -EINVAL;
1190 goto out;
1191 }
1192
1193
1194
1195 fl4 = &inet->cork.fl.u.ip4;
1196 fl4->daddr = daddr;
1197 fl4->saddr = saddr;
1198 fl4->fl4_dport = dport;
1199 fl4->fl4_sport = inet->inet_sport;
1200 up->pending = AF_INET;
1201
1202 do_append_data:
1203 up->len += ulen;
1204 err = ip_append_data(sk, fl4, getfrag, msg, ulen,
1205 sizeof(struct udphdr), &ipc, &rt,
1206 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1207 if (err)
1208 udp_flush_pending_frames(sk);
1209 else if (!corkreq)
1210 err = udp_push_pending_frames(sk);
1211 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1212 up->pending = 0;
1213 release_sock(sk);
1214
1215 out:
1216 ip_rt_put(rt);
1217 out_free:
1218 if (free)
1219 kfree(ipc.opt);
1220 if (!err)
1221 return len;
1222
1223
1224
1225
1226
1227
1228
1229 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1230 UDP_INC_STATS(sock_net(sk),
1231 UDP_MIB_SNDBUFERRORS, is_udplite);
1232 }
1233 return err;
1234
1235 do_confirm:
1236 if (msg->msg_flags & MSG_PROBE)
1237 dst_confirm_neigh(&rt->dst, &fl4->daddr);
1238 if (!(msg->msg_flags&MSG_PROBE) || len)
1239 goto back_from_confirm;
1240 err = 0;
1241 goto out;
1242 }
1243 EXPORT_SYMBOL(udp_sendmsg);
1244
1245 int udp_sendpage(struct sock *sk, struct page *page, int offset,
1246 size_t size, int flags)
1247 {
1248 struct inet_sock *inet = inet_sk(sk);
1249 struct udp_sock *up = udp_sk(sk);
1250 int ret;
1251
1252 if (flags & MSG_SENDPAGE_NOTLAST)
1253 flags |= MSG_MORE;
1254
1255 if (!up->pending) {
1256 struct msghdr msg = { .msg_flags = flags|MSG_MORE };
1257
1258
1259
1260
1261
1262 ret = udp_sendmsg(sk, &msg, 0);
1263 if (ret < 0)
1264 return ret;
1265 }
1266
1267 lock_sock(sk);
1268
1269 if (unlikely(!up->pending)) {
1270 release_sock(sk);
1271
1272 net_dbg_ratelimited("cork failed\n");
1273 return -EINVAL;
1274 }
1275
1276 ret = ip_append_page(sk, &inet->cork.fl.u.ip4,
1277 page, offset, size, flags);
1278 if (ret == -EOPNOTSUPP) {
1279 release_sock(sk);
1280 return sock_no_sendpage(sk->sk_socket, page, offset,
1281 size, flags);
1282 }
1283 if (ret < 0) {
1284 udp_flush_pending_frames(sk);
1285 goto out;
1286 }
1287
1288 up->len += size;
1289 if (!(up->corkflag || (flags&MSG_MORE)))
1290 ret = udp_push_pending_frames(sk);
1291 if (!ret)
1292 ret = size;
1293 out:
1294 release_sock(sk);
1295 return ret;
1296 }
1297
1298 #define UDP_SKB_IS_STATELESS 0x80000000
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308 static bool udp_try_make_stateless(struct sk_buff *skb)
1309 {
1310 if (!skb_has_extensions(skb))
1311 return true;
1312
1313 if (!secpath_exists(skb)) {
1314 skb_ext_reset(skb);
1315 return true;
1316 }
1317
1318 return false;
1319 }
1320
1321 static void udp_set_dev_scratch(struct sk_buff *skb)
1322 {
1323 struct udp_dev_scratch *scratch = udp_skb_scratch(skb);
1324
1325 BUILD_BUG_ON(sizeof(struct udp_dev_scratch) > sizeof(long));
1326 scratch->_tsize_state = skb->truesize;
1327 #if BITS_PER_LONG == 64
1328 scratch->len = skb->len;
1329 scratch->csum_unnecessary = !!skb_csum_unnecessary(skb);
1330 scratch->is_linear = !skb_is_nonlinear(skb);
1331 #endif
1332 if (udp_try_make_stateless(skb))
1333 scratch->_tsize_state |= UDP_SKB_IS_STATELESS;
1334 }
1335
1336 static void udp_skb_csum_unnecessary_set(struct sk_buff *skb)
1337 {
1338
1339
1340
1341
1342
1343
1344 #if BITS_PER_LONG == 64
1345 if (!skb_shared(skb))
1346 udp_skb_scratch(skb)->csum_unnecessary = true;
1347 #endif
1348 }
1349
1350 static int udp_skb_truesize(struct sk_buff *skb)
1351 {
1352 return udp_skb_scratch(skb)->_tsize_state & ~UDP_SKB_IS_STATELESS;
1353 }
1354
1355 static bool udp_skb_has_head_state(struct sk_buff *skb)
1356 {
1357 return !(udp_skb_scratch(skb)->_tsize_state & UDP_SKB_IS_STATELESS);
1358 }
1359
1360
1361 static void udp_rmem_release(struct sock *sk, int size, int partial,
1362 bool rx_queue_lock_held)
1363 {
1364 struct udp_sock *up = udp_sk(sk);
1365 struct sk_buff_head *sk_queue;
1366 int amt;
1367
1368 if (likely(partial)) {
1369 up->forward_deficit += size;
1370 size = up->forward_deficit;
1371 if (size < (sk->sk_rcvbuf >> 2) &&
1372 !skb_queue_empty(&up->reader_queue))
1373 return;
1374 } else {
1375 size += up->forward_deficit;
1376 }
1377 up->forward_deficit = 0;
1378
1379
1380
1381
1382 sk_queue = &sk->sk_receive_queue;
1383 if (!rx_queue_lock_held)
1384 spin_lock(&sk_queue->lock);
1385
1386
1387 sk->sk_forward_alloc += size;
1388 amt = (sk->sk_forward_alloc - partial) & ~(SK_MEM_QUANTUM - 1);
1389 sk->sk_forward_alloc -= amt;
1390
1391 if (amt)
1392 __sk_mem_reduce_allocated(sk, amt >> SK_MEM_QUANTUM_SHIFT);
1393
1394 atomic_sub(size, &sk->sk_rmem_alloc);
1395
1396
1397 skb_queue_splice_tail_init(sk_queue, &up->reader_queue);
1398
1399 if (!rx_queue_lock_held)
1400 spin_unlock(&sk_queue->lock);
1401 }
1402
1403
1404
1405
1406
1407
1408 void udp_skb_destructor(struct sock *sk, struct sk_buff *skb)
1409 {
1410 prefetch(&skb->data);
1411 udp_rmem_release(sk, udp_skb_truesize(skb), 1, false);
1412 }
1413 EXPORT_SYMBOL(udp_skb_destructor);
1414
1415
1416 static void udp_skb_dtor_locked(struct sock *sk, struct sk_buff *skb)
1417 {
1418 prefetch(&skb->data);
1419 udp_rmem_release(sk, udp_skb_truesize(skb), 1, true);
1420 }
1421
1422
1423
1424
1425
1426
1427
1428
1429 static int udp_busylocks_log __read_mostly;
1430 static spinlock_t *udp_busylocks __read_mostly;
1431
1432 static spinlock_t *busylock_acquire(void *ptr)
1433 {
1434 spinlock_t *busy;
1435
1436 busy = udp_busylocks + hash_ptr(ptr, udp_busylocks_log);
1437 spin_lock(busy);
1438 return busy;
1439 }
1440
1441 static void busylock_release(spinlock_t *busy)
1442 {
1443 if (busy)
1444 spin_unlock(busy);
1445 }
1446
1447 int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb)
1448 {
1449 struct sk_buff_head *list = &sk->sk_receive_queue;
1450 int rmem, delta, amt, err = -ENOMEM;
1451 spinlock_t *busy = NULL;
1452 int size;
1453
1454
1455
1456
1457 rmem = atomic_read(&sk->sk_rmem_alloc);
1458 if (rmem > sk->sk_rcvbuf)
1459 goto drop;
1460
1461
1462
1463
1464
1465
1466
1467 if (rmem > (sk->sk_rcvbuf >> 1)) {
1468 skb_condense(skb);
1469
1470 busy = busylock_acquire(sk);
1471 }
1472 size = skb->truesize;
1473 udp_set_dev_scratch(skb);
1474
1475
1476
1477
1478 rmem = atomic_add_return(size, &sk->sk_rmem_alloc);
1479 if (rmem > (size + (unsigned int)sk->sk_rcvbuf))
1480 goto uncharge_drop;
1481
1482 spin_lock(&list->lock);
1483 if (size >= sk->sk_forward_alloc) {
1484 amt = sk_mem_pages(size);
1485 delta = amt << SK_MEM_QUANTUM_SHIFT;
1486 if (!__sk_mem_raise_allocated(sk, delta, amt, SK_MEM_RECV)) {
1487 err = -ENOBUFS;
1488 spin_unlock(&list->lock);
1489 goto uncharge_drop;
1490 }
1491
1492 sk->sk_forward_alloc += delta;
1493 }
1494
1495 sk->sk_forward_alloc -= size;
1496
1497
1498
1499
1500 sock_skb_set_dropcount(sk, skb);
1501
1502 __skb_queue_tail(list, skb);
1503 spin_unlock(&list->lock);
1504
1505 if (!sock_flag(sk, SOCK_DEAD))
1506 sk->sk_data_ready(sk);
1507
1508 busylock_release(busy);
1509 return 0;
1510
1511 uncharge_drop:
1512 atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
1513
1514 drop:
1515 atomic_inc(&sk->sk_drops);
1516 busylock_release(busy);
1517 return err;
1518 }
1519 EXPORT_SYMBOL_GPL(__udp_enqueue_schedule_skb);
1520
1521 void udp_destruct_sock(struct sock *sk)
1522 {
1523
1524 struct udp_sock *up = udp_sk(sk);
1525 unsigned int total = 0;
1526 struct sk_buff *skb;
1527
1528 skb_queue_splice_tail_init(&sk->sk_receive_queue, &up->reader_queue);
1529 while ((skb = __skb_dequeue(&up->reader_queue)) != NULL) {
1530 total += skb->truesize;
1531 kfree_skb(skb);
1532 }
1533 udp_rmem_release(sk, total, 0, true);
1534
1535 inet_sock_destruct(sk);
1536 }
1537 EXPORT_SYMBOL_GPL(udp_destruct_sock);
1538
1539 int udp_init_sock(struct sock *sk)
1540 {
1541 skb_queue_head_init(&udp_sk(sk)->reader_queue);
1542 sk->sk_destruct = udp_destruct_sock;
1543 return 0;
1544 }
1545 EXPORT_SYMBOL_GPL(udp_init_sock);
1546
1547 void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len)
1548 {
1549 if (unlikely(READ_ONCE(sk->sk_peek_off) >= 0)) {
1550 bool slow = lock_sock_fast(sk);
1551
1552 sk_peek_offset_bwd(sk, len);
1553 unlock_sock_fast(sk, slow);
1554 }
1555
1556 if (!skb_unref(skb))
1557 return;
1558
1559
1560
1561
1562 if (unlikely(udp_skb_has_head_state(skb)))
1563 skb_release_head_state(skb);
1564 __consume_stateless_skb(skb);
1565 }
1566 EXPORT_SYMBOL_GPL(skb_consume_udp);
1567
1568 static struct sk_buff *__first_packet_length(struct sock *sk,
1569 struct sk_buff_head *rcvq,
1570 int *total)
1571 {
1572 struct sk_buff *skb;
1573
1574 while ((skb = skb_peek(rcvq)) != NULL) {
1575 if (udp_lib_checksum_complete(skb)) {
1576 __UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS,
1577 IS_UDPLITE(sk));
1578 __UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
1579 IS_UDPLITE(sk));
1580 atomic_inc(&sk->sk_drops);
1581 __skb_unlink(skb, rcvq);
1582 *total += skb->truesize;
1583 kfree_skb(skb);
1584 } else {
1585 udp_skb_csum_unnecessary_set(skb);
1586 break;
1587 }
1588 }
1589 return skb;
1590 }
1591
1592
1593
1594
1595
1596
1597
1598
1599 static int first_packet_length(struct sock *sk)
1600 {
1601 struct sk_buff_head *rcvq = &udp_sk(sk)->reader_queue;
1602 struct sk_buff_head *sk_queue = &sk->sk_receive_queue;
1603 struct sk_buff *skb;
1604 int total = 0;
1605 int res;
1606
1607 spin_lock_bh(&rcvq->lock);
1608 skb = __first_packet_length(sk, rcvq, &total);
1609 if (!skb && !skb_queue_empty_lockless(sk_queue)) {
1610 spin_lock(&sk_queue->lock);
1611 skb_queue_splice_tail_init(sk_queue, rcvq);
1612 spin_unlock(&sk_queue->lock);
1613
1614 skb = __first_packet_length(sk, rcvq, &total);
1615 }
1616 res = skb ? skb->len : -1;
1617 if (total)
1618 udp_rmem_release(sk, total, 1, false);
1619 spin_unlock_bh(&rcvq->lock);
1620 return res;
1621 }
1622
1623
1624
1625
1626
1627 int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
1628 {
1629 switch (cmd) {
1630 case SIOCOUTQ:
1631 {
1632 int amount = sk_wmem_alloc_get(sk);
1633
1634 return put_user(amount, (int __user *)arg);
1635 }
1636
1637 case SIOCINQ:
1638 {
1639 int amount = max_t(int, 0, first_packet_length(sk));
1640
1641 return put_user(amount, (int __user *)arg);
1642 }
1643
1644 default:
1645 return -ENOIOCTLCMD;
1646 }
1647
1648 return 0;
1649 }
1650 EXPORT_SYMBOL(udp_ioctl);
1651
1652 struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags,
1653 int noblock, int *off, int *err)
1654 {
1655 struct sk_buff_head *sk_queue = &sk->sk_receive_queue;
1656 struct sk_buff_head *queue;
1657 struct sk_buff *last;
1658 long timeo;
1659 int error;
1660
1661 queue = &udp_sk(sk)->reader_queue;
1662 flags |= noblock ? MSG_DONTWAIT : 0;
1663 timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
1664 do {
1665 struct sk_buff *skb;
1666
1667 error = sock_error(sk);
1668 if (error)
1669 break;
1670
1671 error = -EAGAIN;
1672 do {
1673 spin_lock_bh(&queue->lock);
1674 skb = __skb_try_recv_from_queue(sk, queue, flags,
1675 udp_skb_destructor,
1676 off, err, &last);
1677 if (skb) {
1678 spin_unlock_bh(&queue->lock);
1679 return skb;
1680 }
1681
1682 if (skb_queue_empty_lockless(sk_queue)) {
1683 spin_unlock_bh(&queue->lock);
1684 goto busy_check;
1685 }
1686
1687
1688
1689
1690
1691
1692 spin_lock(&sk_queue->lock);
1693 skb_queue_splice_tail_init(sk_queue, queue);
1694
1695 skb = __skb_try_recv_from_queue(sk, queue, flags,
1696 udp_skb_dtor_locked,
1697 off, err, &last);
1698 spin_unlock(&sk_queue->lock);
1699 spin_unlock_bh(&queue->lock);
1700 if (skb)
1701 return skb;
1702
1703 busy_check:
1704 if (!sk_can_busy_loop(sk))
1705 break;
1706
1707 sk_busy_loop(sk, flags & MSG_DONTWAIT);
1708 } while (!skb_queue_empty_lockless(sk_queue));
1709
1710
1711 } while (timeo &&
1712 !__skb_wait_for_more_packets(sk, &error, &timeo,
1713 (struct sk_buff *)sk_queue));
1714
1715 *err = error;
1716 return NULL;
1717 }
1718 EXPORT_SYMBOL(__skb_recv_udp);
1719
1720
1721
1722
1723
1724
1725 int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
1726 int flags, int *addr_len)
1727 {
1728 struct inet_sock *inet = inet_sk(sk);
1729 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
1730 struct sk_buff *skb;
1731 unsigned int ulen, copied;
1732 int off, err, peeking = flags & MSG_PEEK;
1733 int is_udplite = IS_UDPLITE(sk);
1734 bool checksum_valid = false;
1735
1736 if (flags & MSG_ERRQUEUE)
1737 return ip_recv_error(sk, msg, len, addr_len);
1738
1739 try_again:
1740 off = sk_peek_offset(sk, flags);
1741 skb = __skb_recv_udp(sk, flags, noblock, &off, &err);
1742 if (!skb)
1743 return err;
1744
1745 ulen = udp_skb_len(skb);
1746 copied = len;
1747 if (copied > ulen - off)
1748 copied = ulen - off;
1749 else if (copied < ulen)
1750 msg->msg_flags |= MSG_TRUNC;
1751
1752
1753
1754
1755
1756
1757
1758 if (copied < ulen || peeking ||
1759 (is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
1760 checksum_valid = udp_skb_csum_unnecessary(skb) ||
1761 !__udp_lib_checksum_complete(skb);
1762 if (!checksum_valid)
1763 goto csum_copy_err;
1764 }
1765
1766 if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
1767 if (udp_skb_is_linear(skb))
1768 err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
1769 else
1770 err = skb_copy_datagram_msg(skb, off, msg, copied);
1771 } else {
1772 err = skb_copy_and_csum_datagram_msg(skb, off, msg);
1773
1774 if (err == -EINVAL)
1775 goto csum_copy_err;
1776 }
1777
1778 if (unlikely(err)) {
1779 if (!peeking) {
1780 atomic_inc(&sk->sk_drops);
1781 UDP_INC_STATS(sock_net(sk),
1782 UDP_MIB_INERRORS, is_udplite);
1783 }
1784 kfree_skb(skb);
1785 return err;
1786 }
1787
1788 if (!peeking)
1789 UDP_INC_STATS(sock_net(sk),
1790 UDP_MIB_INDATAGRAMS, is_udplite);
1791
1792 sock_recv_ts_and_drops(msg, sk, skb);
1793
1794
1795 if (sin) {
1796 sin->sin_family = AF_INET;
1797 sin->sin_port = udp_hdr(skb)->source;
1798 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1799 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1800 *addr_len = sizeof(*sin);
1801
1802 if (cgroup_bpf_enabled)
1803 BPF_CGROUP_RUN_PROG_UDP4_RECVMSG_LOCK(sk,
1804 (struct sockaddr *)sin);
1805 }
1806
1807 if (udp_sk(sk)->gro_enabled)
1808 udp_cmsg_recv(msg, sk, skb);
1809
1810 if (inet->cmsg_flags)
1811 ip_cmsg_recv_offset(msg, sk, skb, sizeof(struct udphdr), off);
1812
1813 err = copied;
1814 if (flags & MSG_TRUNC)
1815 err = ulen;
1816
1817 skb_consume_udp(sk, skb, peeking ? -err : err);
1818 return err;
1819
1820 csum_copy_err:
1821 if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
1822 udp_skb_destructor)) {
1823 UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
1824 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
1825 }
1826 kfree_skb(skb);
1827
1828
1829 cond_resched();
1830 msg->msg_flags &= ~MSG_TRUNC;
1831 goto try_again;
1832 }
1833
1834 int udp_pre_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
1835 {
1836
1837
1838
1839
1840 if (addr_len < sizeof(struct sockaddr_in))
1841 return -EINVAL;
1842
1843 return BPF_CGROUP_RUN_PROG_INET4_CONNECT_LOCK(sk, uaddr);
1844 }
1845 EXPORT_SYMBOL(udp_pre_connect);
1846
1847 int __udp_disconnect(struct sock *sk, int flags)
1848 {
1849 struct inet_sock *inet = inet_sk(sk);
1850
1851
1852
1853
1854 sk->sk_state = TCP_CLOSE;
1855 inet->inet_daddr = 0;
1856 inet->inet_dport = 0;
1857 sock_rps_reset_rxhash(sk);
1858 sk->sk_bound_dev_if = 0;
1859 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) {
1860 inet_reset_saddr(sk);
1861 if (sk->sk_prot->rehash &&
1862 (sk->sk_userlocks & SOCK_BINDPORT_LOCK))
1863 sk->sk_prot->rehash(sk);
1864 }
1865
1866 if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) {
1867 sk->sk_prot->unhash(sk);
1868 inet->inet_sport = 0;
1869 }
1870 sk_dst_reset(sk);
1871 return 0;
1872 }
1873 EXPORT_SYMBOL(__udp_disconnect);
1874
1875 int udp_disconnect(struct sock *sk, int flags)
1876 {
1877 lock_sock(sk);
1878 __udp_disconnect(sk, flags);
1879 release_sock(sk);
1880 return 0;
1881 }
1882 EXPORT_SYMBOL(udp_disconnect);
1883
1884 void udp_lib_unhash(struct sock *sk)
1885 {
1886 if (sk_hashed(sk)) {
1887 struct udp_table *udptable = sk->sk_prot->h.udp_table;
1888 struct udp_hslot *hslot, *hslot2;
1889
1890 hslot = udp_hashslot(udptable, sock_net(sk),
1891 udp_sk(sk)->udp_port_hash);
1892 hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
1893
1894 spin_lock_bh(&hslot->lock);
1895 if (rcu_access_pointer(sk->sk_reuseport_cb))
1896 reuseport_detach_sock(sk);
1897 if (sk_del_node_init_rcu(sk)) {
1898 hslot->count--;
1899 inet_sk(sk)->inet_num = 0;
1900 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
1901
1902 spin_lock(&hslot2->lock);
1903 hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
1904 hslot2->count--;
1905 spin_unlock(&hslot2->lock);
1906 }
1907 spin_unlock_bh(&hslot->lock);
1908 }
1909 }
1910 EXPORT_SYMBOL(udp_lib_unhash);
1911
1912
1913
1914
1915 void udp_lib_rehash(struct sock *sk, u16 newhash)
1916 {
1917 if (sk_hashed(sk)) {
1918 struct udp_table *udptable = sk->sk_prot->h.udp_table;
1919 struct udp_hslot *hslot, *hslot2, *nhslot2;
1920
1921 hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
1922 nhslot2 = udp_hashslot2(udptable, newhash);
1923 udp_sk(sk)->udp_portaddr_hash = newhash;
1924
1925 if (hslot2 != nhslot2 ||
1926 rcu_access_pointer(sk->sk_reuseport_cb)) {
1927 hslot = udp_hashslot(udptable, sock_net(sk),
1928 udp_sk(sk)->udp_port_hash);
1929
1930 spin_lock_bh(&hslot->lock);
1931 if (rcu_access_pointer(sk->sk_reuseport_cb))
1932 reuseport_detach_sock(sk);
1933
1934 if (hslot2 != nhslot2) {
1935 spin_lock(&hslot2->lock);
1936 hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
1937 hslot2->count--;
1938 spin_unlock(&hslot2->lock);
1939
1940 spin_lock(&nhslot2->lock);
1941 hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
1942 &nhslot2->head);
1943 nhslot2->count++;
1944 spin_unlock(&nhslot2->lock);
1945 }
1946
1947 spin_unlock_bh(&hslot->lock);
1948 }
1949 }
1950 }
1951 EXPORT_SYMBOL(udp_lib_rehash);
1952
1953 void udp_v4_rehash(struct sock *sk)
1954 {
1955 u16 new_hash = ipv4_portaddr_hash(sock_net(sk),
1956 inet_sk(sk)->inet_rcv_saddr,
1957 inet_sk(sk)->inet_num);
1958 udp_lib_rehash(sk, new_hash);
1959 }
1960
1961 static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
1962 {
1963 int rc;
1964
1965 if (inet_sk(sk)->inet_daddr) {
1966 sock_rps_save_rxhash(sk, skb);
1967 sk_mark_napi_id(sk, skb);
1968 sk_incoming_cpu_update(sk);
1969 } else {
1970 sk_mark_napi_id_once(sk, skb);
1971 }
1972
1973 rc = __udp_enqueue_schedule_skb(sk, skb);
1974 if (rc < 0) {
1975 int is_udplite = IS_UDPLITE(sk);
1976
1977
1978 if (rc == -ENOMEM)
1979 UDP_INC_STATS(sock_net(sk), UDP_MIB_RCVBUFERRORS,
1980 is_udplite);
1981 UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
1982 kfree_skb(skb);
1983 trace_udp_fail_queue_rcv_skb(rc, sk);
1984 return -1;
1985 }
1986
1987 return 0;
1988 }
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998 static int udp_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb)
1999 {
2000 struct udp_sock *up = udp_sk(sk);
2001 int is_udplite = IS_UDPLITE(sk);
2002
2003
2004
2005
2006 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
2007 goto drop;
2008 nf_reset_ct(skb);
2009
2010 if (static_branch_unlikely(&udp_encap_needed_key) && up->encap_type) {
2011 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025 encap_rcv = READ_ONCE(up->encap_rcv);
2026 if (encap_rcv) {
2027 int ret;
2028
2029
2030 if (udp_lib_checksum_complete(skb))
2031 goto csum_error;
2032
2033 ret = encap_rcv(sk, skb);
2034 if (ret <= 0) {
2035 __UDP_INC_STATS(sock_net(sk),
2036 UDP_MIB_INDATAGRAMS,
2037 is_udplite);
2038 return -ret;
2039 }
2040 }
2041
2042
2043 }
2044
2045
2046
2047
2048 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061 if (up->pcrlen == 0) {
2062 net_dbg_ratelimited("UDPLite: partial coverage %d while full coverage %d requested\n",
2063 UDP_SKB_CB(skb)->cscov, skb->len);
2064 goto drop;
2065 }
2066
2067
2068
2069
2070
2071
2072 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
2073 net_dbg_ratelimited("UDPLite: coverage %d too small, need min %d\n",
2074 UDP_SKB_CB(skb)->cscov, up->pcrlen);
2075 goto drop;
2076 }
2077 }
2078
2079 prefetch(&sk->sk_rmem_alloc);
2080 if (rcu_access_pointer(sk->sk_filter) &&
2081 udp_lib_checksum_complete(skb))
2082 goto csum_error;
2083
2084 if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
2085 goto drop;
2086
2087 udp_csum_pull_header(skb);
2088
2089 ipv4_pktinfo_prepare(sk, skb);
2090 return __udp_queue_rcv_skb(sk, skb);
2091
2092 csum_error:
2093 __UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
2094 drop:
2095 __UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
2096 atomic_inc(&sk->sk_drops);
2097 kfree_skb(skb);
2098 return -1;
2099 }
2100
2101 static int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
2102 {
2103 struct sk_buff *next, *segs;
2104 int ret;
2105
2106 if (likely(!udp_unexpected_gso(sk, skb)))
2107 return udp_queue_rcv_one_skb(sk, skb);
2108
2109 BUILD_BUG_ON(sizeof(struct udp_skb_cb) > SKB_SGO_CB_OFFSET);
2110 __skb_push(skb, -skb_mac_offset(skb));
2111 segs = udp_rcv_segment(sk, skb, true);
2112 for (skb = segs; skb; skb = next) {
2113 next = skb->next;
2114 __skb_pull(skb, skb_transport_offset(skb));
2115 ret = udp_queue_rcv_one_skb(sk, skb);
2116 if (ret > 0)
2117 ip_protocol_deliver_rcu(dev_net(skb->dev), skb, -ret);
2118 }
2119 return 0;
2120 }
2121
2122
2123
2124
2125 bool udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
2126 {
2127 struct dst_entry *old;
2128
2129 if (dst_hold_safe(dst)) {
2130 old = xchg(&sk->sk_rx_dst, dst);
2131 dst_release(old);
2132 return old != dst;
2133 }
2134 return false;
2135 }
2136 EXPORT_SYMBOL(udp_sk_rx_dst_set);
2137
2138
2139
2140
2141
2142
2143 static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
2144 struct udphdr *uh,
2145 __be32 saddr, __be32 daddr,
2146 struct udp_table *udptable,
2147 int proto)
2148 {
2149 struct sock *sk, *first = NULL;
2150 unsigned short hnum = ntohs(uh->dest);
2151 struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
2152 unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
2153 unsigned int offset = offsetof(typeof(*sk), sk_node);
2154 int dif = skb->dev->ifindex;
2155 int sdif = inet_sdif(skb);
2156 struct hlist_node *node;
2157 struct sk_buff *nskb;
2158
2159 if (use_hash2) {
2160 hash2_any = ipv4_portaddr_hash(net, htonl(INADDR_ANY), hnum) &
2161 udptable->mask;
2162 hash2 = ipv4_portaddr_hash(net, daddr, hnum) & udptable->mask;
2163 start_lookup:
2164 hslot = &udptable->hash2[hash2];
2165 offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
2166 }
2167
2168 sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
2169 if (!__udp_is_mcast_sock(net, sk, uh->dest, daddr,
2170 uh->source, saddr, dif, sdif, hnum))
2171 continue;
2172
2173 if (!first) {
2174 first = sk;
2175 continue;
2176 }
2177 nskb = skb_clone(skb, GFP_ATOMIC);
2178
2179 if (unlikely(!nskb)) {
2180 atomic_inc(&sk->sk_drops);
2181 __UDP_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
2182 IS_UDPLITE(sk));
2183 __UDP_INC_STATS(net, UDP_MIB_INERRORS,
2184 IS_UDPLITE(sk));
2185 continue;
2186 }
2187 if (udp_queue_rcv_skb(sk, nskb) > 0)
2188 consume_skb(nskb);
2189 }
2190
2191
2192 if (use_hash2 && hash2 != hash2_any) {
2193 hash2 = hash2_any;
2194 goto start_lookup;
2195 }
2196
2197 if (first) {
2198 if (udp_queue_rcv_skb(first, skb) > 0)
2199 consume_skb(skb);
2200 } else {
2201 kfree_skb(skb);
2202 __UDP_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
2203 proto == IPPROTO_UDPLITE);
2204 }
2205 return 0;
2206 }
2207
2208
2209
2210
2211
2212
2213 static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
2214 int proto)
2215 {
2216 int err;
2217
2218 UDP_SKB_CB(skb)->partial_cov = 0;
2219 UDP_SKB_CB(skb)->cscov = skb->len;
2220
2221 if (proto == IPPROTO_UDPLITE) {
2222 err = udplite_checksum_init(skb, uh);
2223 if (err)
2224 return err;
2225
2226 if (UDP_SKB_CB(skb)->partial_cov) {
2227 skb->csum = inet_compute_pseudo(skb, proto);
2228 return 0;
2229 }
2230 }
2231
2232
2233
2234
2235 err = (__force int)skb_checksum_init_zero_check(skb, proto, uh->check,
2236 inet_compute_pseudo);
2237 if (err)
2238 return err;
2239
2240 if (skb->ip_summed == CHECKSUM_COMPLETE && !skb->csum_valid) {
2241
2242 if (skb->csum_complete_sw)
2243 return 1;
2244
2245
2246
2247
2248
2249 skb_checksum_complete_unset(skb);
2250 }
2251
2252 return 0;
2253 }
2254
2255
2256
2257
2258 static int udp_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb,
2259 struct udphdr *uh)
2260 {
2261 int ret;
2262
2263 if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
2264 skb_checksum_try_convert(skb, IPPROTO_UDP, inet_compute_pseudo);
2265
2266 ret = udp_queue_rcv_skb(sk, skb);
2267
2268
2269
2270
2271 if (ret > 0)
2272 return -ret;
2273 return 0;
2274 }
2275
2276
2277
2278
2279
2280 int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
2281 int proto)
2282 {
2283 struct sock *sk;
2284 struct udphdr *uh;
2285 unsigned short ulen;
2286 struct rtable *rt = skb_rtable(skb);
2287 __be32 saddr, daddr;
2288 struct net *net = dev_net(skb->dev);
2289
2290
2291
2292
2293 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
2294 goto drop;
2295
2296 uh = udp_hdr(skb);
2297 ulen = ntohs(uh->len);
2298 saddr = ip_hdr(skb)->saddr;
2299 daddr = ip_hdr(skb)->daddr;
2300
2301 if (ulen > skb->len)
2302 goto short_packet;
2303
2304 if (proto == IPPROTO_UDP) {
2305
2306 if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
2307 goto short_packet;
2308 uh = udp_hdr(skb);
2309 }
2310
2311 if (udp4_csum_init(skb, uh, proto))
2312 goto csum_error;
2313
2314 sk = skb_steal_sock(skb);
2315 if (sk) {
2316 struct dst_entry *dst = skb_dst(skb);
2317 int ret;
2318
2319 if (unlikely(sk->sk_rx_dst != dst))
2320 udp_sk_rx_dst_set(sk, dst);
2321
2322 ret = udp_unicast_rcv_skb(sk, skb, uh);
2323 sock_put(sk);
2324 return ret;
2325 }
2326
2327 if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
2328 return __udp4_lib_mcast_deliver(net, skb, uh,
2329 saddr, daddr, udptable, proto);
2330
2331 sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
2332 if (sk)
2333 return udp_unicast_rcv_skb(sk, skb, uh);
2334
2335 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
2336 goto drop;
2337 nf_reset_ct(skb);
2338
2339
2340 if (udp_lib_checksum_complete(skb))
2341 goto csum_error;
2342
2343 __UDP_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
2344 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
2345
2346
2347
2348
2349
2350 kfree_skb(skb);
2351 return 0;
2352
2353 short_packet:
2354 net_dbg_ratelimited("UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n",
2355 proto == IPPROTO_UDPLITE ? "Lite" : "",
2356 &saddr, ntohs(uh->source),
2357 ulen, skb->len,
2358 &daddr, ntohs(uh->dest));
2359 goto drop;
2360
2361 csum_error:
2362
2363
2364
2365
2366 net_dbg_ratelimited("UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n",
2367 proto == IPPROTO_UDPLITE ? "Lite" : "",
2368 &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest),
2369 ulen);
2370 __UDP_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
2371 drop:
2372 __UDP_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
2373 kfree_skb(skb);
2374 return 0;
2375 }
2376
2377
2378
2379
2380 static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net,
2381 __be16 loc_port, __be32 loc_addr,
2382 __be16 rmt_port, __be32 rmt_addr,
2383 int dif, int sdif)
2384 {
2385 struct sock *sk, *result;
2386 unsigned short hnum = ntohs(loc_port);
2387 unsigned int slot = udp_hashfn(net, hnum, udp_table.mask);
2388 struct udp_hslot *hslot = &udp_table.hash[slot];
2389
2390
2391 if (hslot->count > 10)
2392 return NULL;
2393
2394 result = NULL;
2395 sk_for_each_rcu(sk, &hslot->head) {
2396 if (__udp_is_mcast_sock(net, sk, loc_port, loc_addr,
2397 rmt_port, rmt_addr, dif, sdif, hnum)) {
2398 if (result)
2399 return NULL;
2400 result = sk;
2401 }
2402 }
2403
2404 return result;
2405 }
2406
2407
2408
2409
2410
2411 static struct sock *__udp4_lib_demux_lookup(struct net *net,
2412 __be16 loc_port, __be32 loc_addr,
2413 __be16 rmt_port, __be32 rmt_addr,
2414 int dif, int sdif)
2415 {
2416 unsigned short hnum = ntohs(loc_port);
2417 unsigned int hash2 = ipv4_portaddr_hash(net, loc_addr, hnum);
2418 unsigned int slot2 = hash2 & udp_table.mask;
2419 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
2420 INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr);
2421 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
2422 struct sock *sk;
2423
2424 udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
2425 if (INET_MATCH(sk, net, acookie, rmt_addr,
2426 loc_addr, ports, dif, sdif))
2427 return sk;
2428
2429 break;
2430 }
2431 return NULL;
2432 }
2433
2434 int udp_v4_early_demux(struct sk_buff *skb)
2435 {
2436 struct net *net = dev_net(skb->dev);
2437 struct in_device *in_dev = NULL;
2438 const struct iphdr *iph;
2439 const struct udphdr *uh;
2440 struct sock *sk = NULL;
2441 struct dst_entry *dst;
2442 int dif = skb->dev->ifindex;
2443 int sdif = inet_sdif(skb);
2444 int ours;
2445
2446
2447 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct udphdr)))
2448 return 0;
2449
2450 iph = ip_hdr(skb);
2451 uh = udp_hdr(skb);
2452
2453 if (skb->pkt_type == PACKET_MULTICAST) {
2454 in_dev = __in_dev_get_rcu(skb->dev);
2455
2456 if (!in_dev)
2457 return 0;
2458
2459 ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr,
2460 iph->protocol);
2461 if (!ours)
2462 return 0;
2463
2464 sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr,
2465 uh->source, iph->saddr,
2466 dif, sdif);
2467 } else if (skb->pkt_type == PACKET_HOST) {
2468 sk = __udp4_lib_demux_lookup(net, uh->dest, iph->daddr,
2469 uh->source, iph->saddr, dif, sdif);
2470 }
2471
2472 if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
2473 return 0;
2474
2475 skb->sk = sk;
2476 skb->destructor = sock_efree;
2477 dst = READ_ONCE(sk->sk_rx_dst);
2478
2479 if (dst)
2480 dst = dst_check(dst, 0);
2481 if (dst) {
2482 u32 itag = 0;
2483
2484
2485
2486
2487
2488 skb_dst_set_noref(skb, dst);
2489
2490
2491
2492
2493 if (!inet_sk(sk)->inet_daddr && in_dev)
2494 return ip_mc_validate_source(skb, iph->daddr,
2495 iph->saddr, iph->tos,
2496 skb->dev, in_dev, &itag);
2497 }
2498 return 0;
2499 }
2500
2501 int udp_rcv(struct sk_buff *skb)
2502 {
2503 return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP);
2504 }
2505
2506 void udp_destroy_sock(struct sock *sk)
2507 {
2508 struct udp_sock *up = udp_sk(sk);
2509 bool slow = lock_sock_fast(sk);
2510 udp_flush_pending_frames(sk);
2511 unlock_sock_fast(sk, slow);
2512 if (static_branch_unlikely(&udp_encap_needed_key)) {
2513 if (up->encap_type) {
2514 void (*encap_destroy)(struct sock *sk);
2515 encap_destroy = READ_ONCE(up->encap_destroy);
2516 if (encap_destroy)
2517 encap_destroy(sk);
2518 }
2519 if (up->encap_enabled)
2520 static_branch_dec(&udp_encap_needed_key);
2521 }
2522 }
2523
2524
2525
2526
2527 int udp_lib_setsockopt(struct sock *sk, int level, int optname,
2528 char __user *optval, unsigned int optlen,
2529 int (*push_pending_frames)(struct sock *))
2530 {
2531 struct udp_sock *up = udp_sk(sk);
2532 int val, valbool;
2533 int err = 0;
2534 int is_udplite = IS_UDPLITE(sk);
2535
2536 if (optlen < sizeof(int))
2537 return -EINVAL;
2538
2539 if (get_user(val, (int __user *)optval))
2540 return -EFAULT;
2541
2542 valbool = val ? 1 : 0;
2543
2544 switch (optname) {
2545 case UDP_CORK:
2546 if (val != 0) {
2547 up->corkflag = 1;
2548 } else {
2549 up->corkflag = 0;
2550 lock_sock(sk);
2551 push_pending_frames(sk);
2552 release_sock(sk);
2553 }
2554 break;
2555
2556 case UDP_ENCAP:
2557 switch (val) {
2558 case 0:
2559 case UDP_ENCAP_ESPINUDP:
2560 case UDP_ENCAP_ESPINUDP_NON_IKE:
2561 up->encap_rcv = xfrm4_udp_encap_rcv;
2562
2563 case UDP_ENCAP_L2TPINUDP:
2564 up->encap_type = val;
2565 lock_sock(sk);
2566 udp_tunnel_encap_enable(sk->sk_socket);
2567 release_sock(sk);
2568 break;
2569 default:
2570 err = -ENOPROTOOPT;
2571 break;
2572 }
2573 break;
2574
2575 case UDP_NO_CHECK6_TX:
2576 up->no_check6_tx = valbool;
2577 break;
2578
2579 case UDP_NO_CHECK6_RX:
2580 up->no_check6_rx = valbool;
2581 break;
2582
2583 case UDP_SEGMENT:
2584 if (val < 0 || val > USHRT_MAX)
2585 return -EINVAL;
2586 up->gso_size = val;
2587 break;
2588
2589 case UDP_GRO:
2590 lock_sock(sk);
2591 if (valbool)
2592 udp_tunnel_encap_enable(sk->sk_socket);
2593 up->gro_enabled = valbool;
2594 release_sock(sk);
2595 break;
2596
2597
2598
2599
2600
2601
2602 case UDPLITE_SEND_CSCOV:
2603 if (!is_udplite)
2604 return -ENOPROTOOPT;
2605 if (val != 0 && val < 8)
2606 val = 8;
2607 else if (val > USHRT_MAX)
2608 val = USHRT_MAX;
2609 up->pcslen = val;
2610 up->pcflag |= UDPLITE_SEND_CC;
2611 break;
2612
2613
2614
2615
2616 case UDPLITE_RECV_CSCOV:
2617 if (!is_udplite)
2618 return -ENOPROTOOPT;
2619 if (val != 0 && val < 8)
2620 val = 8;
2621 else if (val > USHRT_MAX)
2622 val = USHRT_MAX;
2623 up->pcrlen = val;
2624 up->pcflag |= UDPLITE_RECV_CC;
2625 break;
2626
2627 default:
2628 err = -ENOPROTOOPT;
2629 break;
2630 }
2631
2632 return err;
2633 }
2634 EXPORT_SYMBOL(udp_lib_setsockopt);
2635
2636 int udp_setsockopt(struct sock *sk, int level, int optname,
2637 char __user *optval, unsigned int optlen)
2638 {
2639 if (level == SOL_UDP || level == SOL_UDPLITE)
2640 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
2641 udp_push_pending_frames);
2642 return ip_setsockopt(sk, level, optname, optval, optlen);
2643 }
2644
2645 #ifdef CONFIG_COMPAT
2646 int compat_udp_setsockopt(struct sock *sk, int level, int optname,
2647 char __user *optval, unsigned int optlen)
2648 {
2649 if (level == SOL_UDP || level == SOL_UDPLITE)
2650 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
2651 udp_push_pending_frames);
2652 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
2653 }
2654 #endif
2655
2656 int udp_lib_getsockopt(struct sock *sk, int level, int optname,
2657 char __user *optval, int __user *optlen)
2658 {
2659 struct udp_sock *up = udp_sk(sk);
2660 int val, len;
2661
2662 if (get_user(len, optlen))
2663 return -EFAULT;
2664
2665 len = min_t(unsigned int, len, sizeof(int));
2666
2667 if (len < 0)
2668 return -EINVAL;
2669
2670 switch (optname) {
2671 case UDP_CORK:
2672 val = up->corkflag;
2673 break;
2674
2675 case UDP_ENCAP:
2676 val = up->encap_type;
2677 break;
2678
2679 case UDP_NO_CHECK6_TX:
2680 val = up->no_check6_tx;
2681 break;
2682
2683 case UDP_NO_CHECK6_RX:
2684 val = up->no_check6_rx;
2685 break;
2686
2687 case UDP_SEGMENT:
2688 val = up->gso_size;
2689 break;
2690
2691
2692
2693 case UDPLITE_SEND_CSCOV:
2694 val = up->pcslen;
2695 break;
2696
2697 case UDPLITE_RECV_CSCOV:
2698 val = up->pcrlen;
2699 break;
2700
2701 default:
2702 return -ENOPROTOOPT;
2703 }
2704
2705 if (put_user(len, optlen))
2706 return -EFAULT;
2707 if (copy_to_user(optval, &val, len))
2708 return -EFAULT;
2709 return 0;
2710 }
2711 EXPORT_SYMBOL(udp_lib_getsockopt);
2712
2713 int udp_getsockopt(struct sock *sk, int level, int optname,
2714 char __user *optval, int __user *optlen)
2715 {
2716 if (level == SOL_UDP || level == SOL_UDPLITE)
2717 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
2718 return ip_getsockopt(sk, level, optname, optval, optlen);
2719 }
2720
2721 #ifdef CONFIG_COMPAT
2722 int compat_udp_getsockopt(struct sock *sk, int level, int optname,
2723 char __user *optval, int __user *optlen)
2724 {
2725 if (level == SOL_UDP || level == SOL_UDPLITE)
2726 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
2727 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
2728 }
2729 #endif
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743 __poll_t udp_poll(struct file *file, struct socket *sock, poll_table *wait)
2744 {
2745 __poll_t mask = datagram_poll(file, sock, wait);
2746 struct sock *sk = sock->sk;
2747
2748 if (!skb_queue_empty_lockless(&udp_sk(sk)->reader_queue))
2749 mask |= EPOLLIN | EPOLLRDNORM;
2750
2751
2752 if ((mask & EPOLLRDNORM) && !(file->f_flags & O_NONBLOCK) &&
2753 !(sk->sk_shutdown & RCV_SHUTDOWN) && first_packet_length(sk) == -1)
2754 mask &= ~(EPOLLIN | EPOLLRDNORM);
2755
2756 return mask;
2757
2758 }
2759 EXPORT_SYMBOL(udp_poll);
2760
2761 int udp_abort(struct sock *sk, int err)
2762 {
2763 lock_sock(sk);
2764
2765 sk->sk_err = err;
2766 sk->sk_error_report(sk);
2767 __udp_disconnect(sk, 0);
2768
2769 release_sock(sk);
2770
2771 return 0;
2772 }
2773 EXPORT_SYMBOL_GPL(udp_abort);
2774
2775 struct proto udp_prot = {
2776 .name = "UDP",
2777 .owner = THIS_MODULE,
2778 .close = udp_lib_close,
2779 .pre_connect = udp_pre_connect,
2780 .connect = ip4_datagram_connect,
2781 .disconnect = udp_disconnect,
2782 .ioctl = udp_ioctl,
2783 .init = udp_init_sock,
2784 .destroy = udp_destroy_sock,
2785 .setsockopt = udp_setsockopt,
2786 .getsockopt = udp_getsockopt,
2787 .sendmsg = udp_sendmsg,
2788 .recvmsg = udp_recvmsg,
2789 .sendpage = udp_sendpage,
2790 .release_cb = ip4_datagram_release_cb,
2791 .hash = udp_lib_hash,
2792 .unhash = udp_lib_unhash,
2793 .rehash = udp_v4_rehash,
2794 .get_port = udp_v4_get_port,
2795 .memory_allocated = &udp_memory_allocated,
2796 .sysctl_mem = sysctl_udp_mem,
2797 .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min),
2798 .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min),
2799 .obj_size = sizeof(struct udp_sock),
2800 .h.udp_table = &udp_table,
2801 #ifdef CONFIG_COMPAT
2802 .compat_setsockopt = compat_udp_setsockopt,
2803 .compat_getsockopt = compat_udp_getsockopt,
2804 #endif
2805 .diag_destroy = udp_abort,
2806 };
2807 EXPORT_SYMBOL(udp_prot);
2808
2809
2810 #ifdef CONFIG_PROC_FS
2811
2812 static struct sock *udp_get_first(struct seq_file *seq, int start)
2813 {
2814 struct sock *sk;
2815 struct udp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file));
2816 struct udp_iter_state *state = seq->private;
2817 struct net *net = seq_file_net(seq);
2818
2819 for (state->bucket = start; state->bucket <= afinfo->udp_table->mask;
2820 ++state->bucket) {
2821 struct udp_hslot *hslot = &afinfo->udp_table->hash[state->bucket];
2822
2823 if (hlist_empty(&hslot->head))
2824 continue;
2825
2826 spin_lock_bh(&hslot->lock);
2827 sk_for_each(sk, &hslot->head) {
2828 if (!net_eq(sock_net(sk), net))
2829 continue;
2830 if (sk->sk_family == afinfo->family)
2831 goto found;
2832 }
2833 spin_unlock_bh(&hslot->lock);
2834 }
2835 sk = NULL;
2836 found:
2837 return sk;
2838 }
2839
2840 static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
2841 {
2842 struct udp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file));
2843 struct udp_iter_state *state = seq->private;
2844 struct net *net = seq_file_net(seq);
2845
2846 do {
2847 sk = sk_next(sk);
2848 } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != afinfo->family));
2849
2850 if (!sk) {
2851 if (state->bucket <= afinfo->udp_table->mask)
2852 spin_unlock_bh(&afinfo->udp_table->hash[state->bucket].lock);
2853 return udp_get_first(seq, state->bucket + 1);
2854 }
2855 return sk;
2856 }
2857
2858 static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos)
2859 {
2860 struct sock *sk = udp_get_first(seq, 0);
2861
2862 if (sk)
2863 while (pos && (sk = udp_get_next(seq, sk)) != NULL)
2864 --pos;
2865 return pos ? NULL : sk;
2866 }
2867
2868 void *udp_seq_start(struct seq_file *seq, loff_t *pos)
2869 {
2870 struct udp_iter_state *state = seq->private;
2871 state->bucket = MAX_UDP_PORTS;
2872
2873 return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
2874 }
2875 EXPORT_SYMBOL(udp_seq_start);
2876
2877 void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2878 {
2879 struct sock *sk;
2880
2881 if (v == SEQ_START_TOKEN)
2882 sk = udp_get_idx(seq, 0);
2883 else
2884 sk = udp_get_next(seq, v);
2885
2886 ++*pos;
2887 return sk;
2888 }
2889 EXPORT_SYMBOL(udp_seq_next);
2890
2891 void udp_seq_stop(struct seq_file *seq, void *v)
2892 {
2893 struct udp_seq_afinfo *afinfo = PDE_DATA(file_inode(seq->file));
2894 struct udp_iter_state *state = seq->private;
2895
2896 if (state->bucket <= afinfo->udp_table->mask)
2897 spin_unlock_bh(&afinfo->udp_table->hash[state->bucket].lock);
2898 }
2899 EXPORT_SYMBOL(udp_seq_stop);
2900
2901
2902 static void udp4_format_sock(struct sock *sp, struct seq_file *f,
2903 int bucket)
2904 {
2905 struct inet_sock *inet = inet_sk(sp);
2906 __be32 dest = inet->inet_daddr;
2907 __be32 src = inet->inet_rcv_saddr;
2908 __u16 destp = ntohs(inet->inet_dport);
2909 __u16 srcp = ntohs(inet->inet_sport);
2910
2911 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
2912 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u",
2913 bucket, src, srcp, dest, destp, sp->sk_state,
2914 sk_wmem_alloc_get(sp),
2915 udp_rqueue_get(sp),
2916 0, 0L, 0,
2917 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
2918 0, sock_i_ino(sp),
2919 refcount_read(&sp->sk_refcnt), sp,
2920 atomic_read(&sp->sk_drops));
2921 }
2922
2923 int udp4_seq_show(struct seq_file *seq, void *v)
2924 {
2925 seq_setwidth(seq, 127);
2926 if (v == SEQ_START_TOKEN)
2927 seq_puts(seq, " sl local_address rem_address st tx_queue "
2928 "rx_queue tr tm->when retrnsmt uid timeout "
2929 "inode ref pointer drops");
2930 else {
2931 struct udp_iter_state *state = seq->private;
2932
2933 udp4_format_sock(v, seq, state->bucket);
2934 }
2935 seq_pad(seq, '\n');
2936 return 0;
2937 }
2938
2939 const struct seq_operations udp_seq_ops = {
2940 .start = udp_seq_start,
2941 .next = udp_seq_next,
2942 .stop = udp_seq_stop,
2943 .show = udp4_seq_show,
2944 };
2945 EXPORT_SYMBOL(udp_seq_ops);
2946
2947 static struct udp_seq_afinfo udp4_seq_afinfo = {
2948 .family = AF_INET,
2949 .udp_table = &udp_table,
2950 };
2951
2952 static int __net_init udp4_proc_init_net(struct net *net)
2953 {
2954 if (!proc_create_net_data("udp", 0444, net->proc_net, &udp_seq_ops,
2955 sizeof(struct udp_iter_state), &udp4_seq_afinfo))
2956 return -ENOMEM;
2957 return 0;
2958 }
2959
2960 static void __net_exit udp4_proc_exit_net(struct net *net)
2961 {
2962 remove_proc_entry("udp", net->proc_net);
2963 }
2964
2965 static struct pernet_operations udp4_net_ops = {
2966 .init = udp4_proc_init_net,
2967 .exit = udp4_proc_exit_net,
2968 };
2969
2970 int __init udp4_proc_init(void)
2971 {
2972 return register_pernet_subsys(&udp4_net_ops);
2973 }
2974
2975 void udp4_proc_exit(void)
2976 {
2977 unregister_pernet_subsys(&udp4_net_ops);
2978 }
2979 #endif
2980
2981 static __initdata unsigned long uhash_entries;
2982 static int __init set_uhash_entries(char *str)
2983 {
2984 ssize_t ret;
2985
2986 if (!str)
2987 return 0;
2988
2989 ret = kstrtoul(str, 0, &uhash_entries);
2990 if (ret)
2991 return 0;
2992
2993 if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN)
2994 uhash_entries = UDP_HTABLE_SIZE_MIN;
2995 return 1;
2996 }
2997 __setup("uhash_entries=", set_uhash_entries);
2998
2999 void __init udp_table_init(struct udp_table *table, const char *name)
3000 {
3001 unsigned int i;
3002
3003 table->hash = alloc_large_system_hash(name,
3004 2 * sizeof(struct udp_hslot),
3005 uhash_entries,
3006 21,
3007 0,
3008 &table->log,
3009 &table->mask,
3010 UDP_HTABLE_SIZE_MIN,
3011 64 * 1024);
3012
3013 table->hash2 = table->hash + (table->mask + 1);
3014 for (i = 0; i <= table->mask; i++) {
3015 INIT_HLIST_HEAD(&table->hash[i].head);
3016 table->hash[i].count = 0;
3017 spin_lock_init(&table->hash[i].lock);
3018 }
3019 for (i = 0; i <= table->mask; i++) {
3020 INIT_HLIST_HEAD(&table->hash2[i].head);
3021 table->hash2[i].count = 0;
3022 spin_lock_init(&table->hash2[i].lock);
3023 }
3024 }
3025
3026 u32 udp_flow_hashrnd(void)
3027 {
3028 static u32 hashrnd __read_mostly;
3029
3030 net_get_random_once(&hashrnd, sizeof(hashrnd));
3031
3032 return hashrnd;
3033 }
3034 EXPORT_SYMBOL(udp_flow_hashrnd);
3035
3036 static void __udp_sysctl_init(struct net *net)
3037 {
3038 net->ipv4.sysctl_udp_rmem_min = SK_MEM_QUANTUM;
3039 net->ipv4.sysctl_udp_wmem_min = SK_MEM_QUANTUM;
3040
3041 #ifdef CONFIG_NET_L3_MASTER_DEV
3042 net->ipv4.sysctl_udp_l3mdev_accept = 0;
3043 #endif
3044 }
3045
3046 static int __net_init udp_sysctl_init(struct net *net)
3047 {
3048 __udp_sysctl_init(net);
3049 return 0;
3050 }
3051
3052 static struct pernet_operations __net_initdata udp_sysctl_ops = {
3053 .init = udp_sysctl_init,
3054 };
3055
3056 void __init udp_init(void)
3057 {
3058 unsigned long limit;
3059 unsigned int i;
3060
3061 udp_table_init(&udp_table, "UDP");
3062 limit = nr_free_buffer_pages() / 8;
3063 limit = max(limit, 128UL);
3064 sysctl_udp_mem[0] = limit / 4 * 3;
3065 sysctl_udp_mem[1] = limit;
3066 sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2;
3067
3068 __udp_sysctl_init(&init_net);
3069
3070
3071 udp_busylocks_log = ilog2(nr_cpu_ids) + 4;
3072 udp_busylocks = kmalloc(sizeof(spinlock_t) << udp_busylocks_log,
3073 GFP_KERNEL);
3074 if (!udp_busylocks)
3075 panic("UDP: failed to alloc udp_busylocks\n");
3076 for (i = 0; i < (1U << udp_busylocks_log); i++)
3077 spin_lock_init(udp_busylocks + i);
3078
3079 if (register_pernet_subsys(&udp_sysctl_ops))
3080 panic("UDP: failed to init sysctl parameters.\n");
3081 }