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80#define pr_fmt(fmt) "UDP: " fmt
81
82#include <asm/uaccess.h>
83#include <asm/ioctls.h>
84#include <linux/bootmem.h>
85#include <linux/highmem.h>
86#include <linux/swap.h>
87#include <linux/types.h>
88#include <linux/fcntl.h>
89#include <linux/module.h>
90#include <linux/socket.h>
91#include <linux/sockios.h>
92#include <linux/igmp.h>
93#include <linux/in.h>
94#include <linux/errno.h>
95#include <linux/timer.h>
96#include <linux/mm.h>
97#include <linux/inet.h>
98#include <linux/netdevice.h>
99#include <linux/slab.h>
100#include <net/tcp_states.h>
101#include <linux/skbuff.h>
102#include <linux/proc_fs.h>
103#include <linux/seq_file.h>
104#include <net/net_namespace.h>
105#include <net/icmp.h>
106#include <net/inet_hashtables.h>
107#include <net/route.h>
108#include <net/checksum.h>
109#include <net/xfrm.h>
110#include <trace/events/udp.h>
111#include <linux/static_key.h>
112#include <trace/events/skb.h>
113#include <net/busy_poll.h>
114#include "udp_impl.h"
115
116struct udp_table udp_table __read_mostly;
117EXPORT_SYMBOL(udp_table);
118
119long sysctl_udp_mem[3] __read_mostly;
120EXPORT_SYMBOL(sysctl_udp_mem);
121
122int sysctl_udp_rmem_min __read_mostly;
123EXPORT_SYMBOL(sysctl_udp_rmem_min);
124
125int sysctl_udp_wmem_min __read_mostly;
126EXPORT_SYMBOL(sysctl_udp_wmem_min);
127
128atomic_long_t udp_memory_allocated;
129EXPORT_SYMBOL(udp_memory_allocated);
130
131#define MAX_UDP_PORTS 65536
132#define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN)
133
134static int udp_lib_lport_inuse(struct net *net, __u16 num,
135 const struct udp_hslot *hslot,
136 unsigned long *bitmap,
137 struct sock *sk,
138 int (*saddr_comp)(const struct sock *sk1,
139 const struct sock *sk2),
140 unsigned int log)
141{
142 struct sock *sk2;
143 struct hlist_nulls_node *node;
144 kuid_t uid = sock_i_uid(sk);
145
146 sk_nulls_for_each(sk2, node, &hslot->head)
147 if (net_eq(sock_net(sk2), net) &&
148 sk2 != sk &&
149 (bitmap || udp_sk(sk2)->udp_port_hash == num) &&
150 (!sk2->sk_reuse || !sk->sk_reuse) &&
151 (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
152 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
153 (!sk2->sk_reuseport || !sk->sk_reuseport ||
154 !uid_eq(uid, sock_i_uid(sk2))) &&
155 (*saddr_comp)(sk, sk2)) {
156 if (bitmap)
157 __set_bit(udp_sk(sk2)->udp_port_hash >> log,
158 bitmap);
159 else
160 return 1;
161 }
162 return 0;
163}
164
165
166
167
168
169static int udp_lib_lport_inuse2(struct net *net, __u16 num,
170 struct udp_hslot *hslot2,
171 struct sock *sk,
172 int (*saddr_comp)(const struct sock *sk1,
173 const struct sock *sk2))
174{
175 struct sock *sk2;
176 struct hlist_nulls_node *node;
177 kuid_t uid = sock_i_uid(sk);
178 int res = 0;
179
180 spin_lock(&hslot2->lock);
181 udp_portaddr_for_each_entry(sk2, node, &hslot2->head)
182 if (net_eq(sock_net(sk2), net) &&
183 sk2 != sk &&
184 (udp_sk(sk2)->udp_port_hash == num) &&
185 (!sk2->sk_reuse || !sk->sk_reuse) &&
186 (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
187 sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
188 (!sk2->sk_reuseport || !sk->sk_reuseport ||
189 !uid_eq(uid, sock_i_uid(sk2))) &&
190 (*saddr_comp)(sk, sk2)) {
191 res = 1;
192 break;
193 }
194 spin_unlock(&hslot2->lock);
195 return res;
196}
197
198
199
200
201
202
203
204
205
206
207int udp_lib_get_port(struct sock *sk, unsigned short snum,
208 int (*saddr_comp)(const struct sock *sk1,
209 const struct sock *sk2),
210 unsigned int hash2_nulladdr)
211{
212 struct udp_hslot *hslot, *hslot2;
213 struct udp_table *udptable = sk->sk_prot->h.udp_table;
214 int error = 1;
215 struct net *net = sock_net(sk);
216
217 if (!snum) {
218 int low, high, remaining;
219 unsigned int rand;
220 unsigned short first, last;
221 DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN);
222
223 inet_get_local_port_range(net, &low, &high);
224 remaining = (high - low) + 1;
225
226 rand = prandom_u32();
227 first = (((u64)rand * remaining) >> 32) + low;
228
229
230
231 rand = (rand | 1) * (udptable->mask + 1);
232 last = first + udptable->mask + 1;
233 do {
234 hslot = udp_hashslot(udptable, net, first);
235 bitmap_zero(bitmap, PORTS_PER_CHAIN);
236 spin_lock_bh(&hslot->lock);
237 udp_lib_lport_inuse(net, snum, hslot, bitmap, sk,
238 saddr_comp, udptable->log);
239
240 snum = first;
241
242
243
244
245
246 do {
247 if (low <= snum && snum <= high &&
248 !test_bit(snum >> udptable->log, bitmap) &&
249 !inet_is_local_reserved_port(net, snum))
250 goto found;
251 snum += rand;
252 } while (snum != first);
253 spin_unlock_bh(&hslot->lock);
254 } while (++first != last);
255 goto fail;
256 } else {
257 hslot = udp_hashslot(udptable, net, snum);
258 spin_lock_bh(&hslot->lock);
259 if (hslot->count > 10) {
260 int exist;
261 unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum;
262
263 slot2 &= udptable->mask;
264 hash2_nulladdr &= udptable->mask;
265
266 hslot2 = udp_hashslot2(udptable, slot2);
267 if (hslot->count < hslot2->count)
268 goto scan_primary_hash;
269
270 exist = udp_lib_lport_inuse2(net, snum, hslot2,
271 sk, saddr_comp);
272 if (!exist && (hash2_nulladdr != slot2)) {
273 hslot2 = udp_hashslot2(udptable, hash2_nulladdr);
274 exist = udp_lib_lport_inuse2(net, snum, hslot2,
275 sk, saddr_comp);
276 }
277 if (exist)
278 goto fail_unlock;
279 else
280 goto found;
281 }
282scan_primary_hash:
283 if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk,
284 saddr_comp, 0))
285 goto fail_unlock;
286 }
287found:
288 inet_sk(sk)->inet_num = snum;
289 udp_sk(sk)->udp_port_hash = snum;
290 udp_sk(sk)->udp_portaddr_hash ^= snum;
291 if (sk_unhashed(sk)) {
292 sk_nulls_add_node_rcu(sk, &hslot->head);
293 hslot->count++;
294 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
295
296 hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
297 spin_lock(&hslot2->lock);
298 hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
299 &hslot2->head);
300 hslot2->count++;
301 spin_unlock(&hslot2->lock);
302 }
303 error = 0;
304fail_unlock:
305 spin_unlock_bh(&hslot->lock);
306fail:
307 return error;
308}
309EXPORT_SYMBOL(udp_lib_get_port);
310
311static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2)
312{
313 struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2);
314
315 return (!ipv6_only_sock(sk2) &&
316 (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr ||
317 inet1->inet_rcv_saddr == inet2->inet_rcv_saddr));
318}
319
320static unsigned int udp4_portaddr_hash(struct net *net, __be32 saddr,
321 unsigned int port)
322{
323 return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
324}
325
326int udp_v4_get_port(struct sock *sk, unsigned short snum)
327{
328 unsigned int hash2_nulladdr =
329 udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum);
330 unsigned int hash2_partial =
331 udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0);
332
333
334 udp_sk(sk)->udp_portaddr_hash = hash2_partial;
335 return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr);
336}
337
338static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr,
339 unsigned short hnum,
340 __be16 sport, __be32 daddr, __be16 dport, int dif)
341{
342 int score = -1;
343
344 if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum &&
345 !ipv6_only_sock(sk)) {
346 struct inet_sock *inet = inet_sk(sk);
347
348 score = (sk->sk_family == PF_INET ? 2 : 1);
349 if (inet->inet_rcv_saddr) {
350 if (inet->inet_rcv_saddr != daddr)
351 return -1;
352 score += 4;
353 }
354 if (inet->inet_daddr) {
355 if (inet->inet_daddr != saddr)
356 return -1;
357 score += 4;
358 }
359 if (inet->inet_dport) {
360 if (inet->inet_dport != sport)
361 return -1;
362 score += 4;
363 }
364 if (sk->sk_bound_dev_if) {
365 if (sk->sk_bound_dev_if != dif)
366 return -1;
367 score += 4;
368 }
369 }
370 return score;
371}
372
373
374
375
376static inline int compute_score2(struct sock *sk, struct net *net,
377 __be32 saddr, __be16 sport,
378 __be32 daddr, unsigned int hnum, int dif)
379{
380 int score = -1;
381
382 if (net_eq(sock_net(sk), net) && !ipv6_only_sock(sk)) {
383 struct inet_sock *inet = inet_sk(sk);
384
385 if (inet->inet_rcv_saddr != daddr)
386 return -1;
387 if (inet->inet_num != hnum)
388 return -1;
389
390 score = (sk->sk_family == PF_INET ? 2 : 1);
391 if (inet->inet_daddr) {
392 if (inet->inet_daddr != saddr)
393 return -1;
394 score += 4;
395 }
396 if (inet->inet_dport) {
397 if (inet->inet_dport != sport)
398 return -1;
399 score += 4;
400 }
401 if (sk->sk_bound_dev_if) {
402 if (sk->sk_bound_dev_if != dif)
403 return -1;
404 score += 4;
405 }
406 }
407 return score;
408}
409
410static unsigned int udp_ehashfn(struct net *net, const __be32 laddr,
411 const __u16 lport, const __be32 faddr,
412 const __be16 fport)
413{
414 static u32 udp_ehash_secret __read_mostly;
415
416 net_get_random_once(&udp_ehash_secret, sizeof(udp_ehash_secret));
417
418 return __inet_ehashfn(laddr, lport, faddr, fport,
419 udp_ehash_secret + net_hash_mix(net));
420}
421
422
423
424static struct sock *udp4_lib_lookup2(struct net *net,
425 __be32 saddr, __be16 sport,
426 __be32 daddr, unsigned int hnum, int dif,
427 struct udp_hslot *hslot2, unsigned int slot2)
428{
429 struct sock *sk, *result;
430 struct hlist_nulls_node *node;
431 int score, badness, matches = 0, reuseport = 0;
432 u32 hash = 0;
433
434begin:
435 result = NULL;
436 badness = 0;
437 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
438 score = compute_score2(sk, net, saddr, sport,
439 daddr, hnum, dif);
440 if (score > badness) {
441 result = sk;
442 badness = score;
443 reuseport = sk->sk_reuseport;
444 if (reuseport) {
445 hash = udp_ehashfn(net, daddr, hnum,
446 saddr, sport);
447 matches = 1;
448 }
449 } else if (score == badness && reuseport) {
450 matches++;
451 if (((u64)hash * matches) >> 32 == 0)
452 result = sk;
453 hash = next_pseudo_random32(hash);
454 }
455 }
456
457
458
459
460
461 if (get_nulls_value(node) != slot2)
462 goto begin;
463 if (result) {
464 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
465 result = NULL;
466 else if (unlikely(compute_score2(result, net, saddr, sport,
467 daddr, hnum, dif) < badness)) {
468 sock_put(result);
469 goto begin;
470 }
471 }
472 return result;
473}
474
475
476
477
478struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
479 __be16 sport, __be32 daddr, __be16 dport,
480 int dif, struct udp_table *udptable)
481{
482 struct sock *sk, *result;
483 struct hlist_nulls_node *node;
484 unsigned short hnum = ntohs(dport);
485 unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
486 struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
487 int score, badness, matches = 0, reuseport = 0;
488 u32 hash = 0;
489
490 rcu_read_lock();
491 if (hslot->count > 10) {
492 hash2 = udp4_portaddr_hash(net, daddr, hnum);
493 slot2 = hash2 & udptable->mask;
494 hslot2 = &udptable->hash2[slot2];
495 if (hslot->count < hslot2->count)
496 goto begin;
497
498 result = udp4_lib_lookup2(net, saddr, sport,
499 daddr, hnum, dif,
500 hslot2, slot2);
501 if (!result) {
502 hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
503 slot2 = hash2 & udptable->mask;
504 hslot2 = &udptable->hash2[slot2];
505 if (hslot->count < hslot2->count)
506 goto begin;
507
508 result = udp4_lib_lookup2(net, saddr, sport,
509 htonl(INADDR_ANY), hnum, dif,
510 hslot2, slot2);
511 }
512 rcu_read_unlock();
513 return result;
514 }
515begin:
516 result = NULL;
517 badness = 0;
518 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
519 score = compute_score(sk, net, saddr, hnum, sport,
520 daddr, dport, dif);
521 if (score > badness) {
522 result = sk;
523 badness = score;
524 reuseport = sk->sk_reuseport;
525 if (reuseport) {
526 hash = udp_ehashfn(net, daddr, hnum,
527 saddr, sport);
528 matches = 1;
529 }
530 } else if (score == badness && reuseport) {
531 matches++;
532 if (((u64)hash * matches) >> 32 == 0)
533 result = sk;
534 hash = next_pseudo_random32(hash);
535 }
536 }
537
538
539
540
541
542 if (get_nulls_value(node) != slot)
543 goto begin;
544
545 if (result) {
546 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
547 result = NULL;
548 else if (unlikely(compute_score(result, net, saddr, hnum, sport,
549 daddr, dport, dif) < badness)) {
550 sock_put(result);
551 goto begin;
552 }
553 }
554 rcu_read_unlock();
555 return result;
556}
557EXPORT_SYMBOL_GPL(__udp4_lib_lookup);
558
559static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb,
560 __be16 sport, __be16 dport,
561 struct udp_table *udptable)
562{
563 const struct iphdr *iph = ip_hdr(skb);
564
565 return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport,
566 iph->daddr, dport, inet_iif(skb),
567 udptable);
568}
569
570struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
571 __be32 daddr, __be16 dport, int dif)
572{
573 return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table);
574}
575EXPORT_SYMBOL_GPL(udp4_lib_lookup);
576
577static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk,
578 __be16 loc_port, __be32 loc_addr,
579 __be16 rmt_port, __be32 rmt_addr,
580 int dif, unsigned short hnum)
581{
582 struct inet_sock *inet = inet_sk(sk);
583
584 if (!net_eq(sock_net(sk), net) ||
585 udp_sk(sk)->udp_port_hash != hnum ||
586 (inet->inet_daddr && inet->inet_daddr != rmt_addr) ||
587 (inet->inet_dport != rmt_port && inet->inet_dport) ||
588 (inet->inet_rcv_saddr && inet->inet_rcv_saddr != loc_addr) ||
589 ipv6_only_sock(sk) ||
590 (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif))
591 return false;
592 if (!ip_mc_sf_allow(sk, loc_addr, rmt_addr, dif))
593 return false;
594 return true;
595}
596
597static inline struct sock *udp_v4_mcast_next(struct net *net, struct sock *sk,
598 __be16 loc_port, __be32 loc_addr,
599 __be16 rmt_port, __be32 rmt_addr,
600 int dif)
601{
602 struct hlist_nulls_node *node;
603 struct sock *s = sk;
604 unsigned short hnum = ntohs(loc_port);
605
606 sk_nulls_for_each_from(s, node) {
607 if (__udp_is_mcast_sock(net, s,
608 loc_port, loc_addr,
609 rmt_port, rmt_addr,
610 dif, hnum))
611 goto found;
612 }
613 s = NULL;
614found:
615 return s;
616}
617
618
619
620
621
622
623
624
625
626
627
628
629void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable)
630{
631 struct inet_sock *inet;
632 const struct iphdr *iph = (const struct iphdr *)skb->data;
633 struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2));
634 const int type = icmp_hdr(skb)->type;
635 const int code = icmp_hdr(skb)->code;
636 struct sock *sk;
637 int harderr;
638 int err;
639 struct net *net = dev_net(skb->dev);
640
641 sk = __udp4_lib_lookup(net, iph->daddr, uh->dest,
642 iph->saddr, uh->source, skb->dev->ifindex, udptable);
643 if (sk == NULL) {
644 ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS);
645 return;
646 }
647
648 err = 0;
649 harderr = 0;
650 inet = inet_sk(sk);
651
652 switch (type) {
653 default:
654 case ICMP_TIME_EXCEEDED:
655 err = EHOSTUNREACH;
656 break;
657 case ICMP_SOURCE_QUENCH:
658 goto out;
659 case ICMP_PARAMETERPROB:
660 err = EPROTO;
661 harderr = 1;
662 break;
663 case ICMP_DEST_UNREACH:
664 if (code == ICMP_FRAG_NEEDED) {
665 ipv4_sk_update_pmtu(skb, sk, info);
666 if (inet->pmtudisc != IP_PMTUDISC_DONT) {
667 err = EMSGSIZE;
668 harderr = 1;
669 break;
670 }
671 goto out;
672 }
673 err = EHOSTUNREACH;
674 if (code <= NR_ICMP_UNREACH) {
675 harderr = icmp_err_convert[code].fatal;
676 err = icmp_err_convert[code].errno;
677 }
678 break;
679 case ICMP_REDIRECT:
680 ipv4_sk_redirect(skb, sk);
681 goto out;
682 }
683
684
685
686
687
688 if (!inet->recverr) {
689 if (!harderr || sk->sk_state != TCP_ESTABLISHED)
690 goto out;
691 } else
692 ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1));
693
694 sk->sk_err = err;
695 sk->sk_error_report(sk);
696out:
697 sock_put(sk);
698}
699
700void udp_err(struct sk_buff *skb, u32 info)
701{
702 __udp4_lib_err(skb, info, &udp_table);
703}
704
705
706
707
708void udp_flush_pending_frames(struct sock *sk)
709{
710 struct udp_sock *up = udp_sk(sk);
711
712 if (up->pending) {
713 up->len = 0;
714 up->pending = 0;
715 ip_flush_pending_frames(sk);
716 }
717}
718EXPORT_SYMBOL(udp_flush_pending_frames);
719
720
721
722
723
724
725
726
727void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst)
728{
729 struct udphdr *uh = udp_hdr(skb);
730 int offset = skb_transport_offset(skb);
731 int len = skb->len - offset;
732 int hlen = len;
733 __wsum csum = 0;
734
735 if (!skb_has_frag_list(skb)) {
736
737
738
739 skb->csum_start = skb_transport_header(skb) - skb->head;
740 skb->csum_offset = offsetof(struct udphdr, check);
741 uh->check = ~csum_tcpudp_magic(src, dst, len,
742 IPPROTO_UDP, 0);
743 } else {
744 struct sk_buff *frags;
745
746
747
748
749
750
751 skb_walk_frags(skb, frags) {
752 csum = csum_add(csum, frags->csum);
753 hlen -= frags->len;
754 }
755
756 csum = skb_checksum(skb, offset, hlen, csum);
757 skb->ip_summed = CHECKSUM_NONE;
758
759 uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
760 if (uh->check == 0)
761 uh->check = CSUM_MANGLED_0;
762 }
763}
764EXPORT_SYMBOL_GPL(udp4_hwcsum);
765
766
767
768
769void udp_set_csum(bool nocheck, struct sk_buff *skb,
770 __be32 saddr, __be32 daddr, int len)
771{
772 struct udphdr *uh = udp_hdr(skb);
773
774 if (nocheck)
775 uh->check = 0;
776 else if (skb_is_gso(skb))
777 uh->check = ~udp_v4_check(len, saddr, daddr, 0);
778 else if (skb_dst(skb) && skb_dst(skb)->dev &&
779 (skb_dst(skb)->dev->features & NETIF_F_V4_CSUM)) {
780
781 BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
782
783 skb->ip_summed = CHECKSUM_PARTIAL;
784 skb->csum_start = skb_transport_header(skb) - skb->head;
785 skb->csum_offset = offsetof(struct udphdr, check);
786 uh->check = ~udp_v4_check(len, saddr, daddr, 0);
787 } else {
788 __wsum csum;
789
790 BUG_ON(skb->ip_summed == CHECKSUM_PARTIAL);
791
792 uh->check = 0;
793 csum = skb_checksum(skb, 0, len, 0);
794 uh->check = udp_v4_check(len, saddr, daddr, csum);
795 if (uh->check == 0)
796 uh->check = CSUM_MANGLED_0;
797
798 skb->ip_summed = CHECKSUM_UNNECESSARY;
799 }
800}
801EXPORT_SYMBOL(udp_set_csum);
802
803static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4)
804{
805 struct sock *sk = skb->sk;
806 struct inet_sock *inet = inet_sk(sk);
807 struct udphdr *uh;
808 int err = 0;
809 int is_udplite = IS_UDPLITE(sk);
810 int offset = skb_transport_offset(skb);
811 int len = skb->len - offset;
812 __wsum csum = 0;
813
814
815
816
817 uh = udp_hdr(skb);
818 uh->source = inet->inet_sport;
819 uh->dest = fl4->fl4_dport;
820 uh->len = htons(len);
821 uh->check = 0;
822
823 if (is_udplite)
824 csum = udplite_csum(skb);
825
826 else if (sk->sk_no_check_tx) {
827
828 skb->ip_summed = CHECKSUM_NONE;
829 goto send;
830
831 } else if (skb->ip_summed == CHECKSUM_PARTIAL) {
832
833 udp4_hwcsum(skb, fl4->saddr, fl4->daddr);
834 goto send;
835
836 } else
837 csum = udp_csum(skb);
838
839
840 uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len,
841 sk->sk_protocol, csum);
842 if (uh->check == 0)
843 uh->check = CSUM_MANGLED_0;
844
845send:
846 err = ip_send_skb(sock_net(sk), skb);
847 if (err) {
848 if (err == -ENOBUFS && !inet->recverr) {
849 UDP_INC_STATS_USER(sock_net(sk),
850 UDP_MIB_SNDBUFERRORS, is_udplite);
851 err = 0;
852 }
853 } else
854 UDP_INC_STATS_USER(sock_net(sk),
855 UDP_MIB_OUTDATAGRAMS, is_udplite);
856 return err;
857}
858
859
860
861
862int udp_push_pending_frames(struct sock *sk)
863{
864 struct udp_sock *up = udp_sk(sk);
865 struct inet_sock *inet = inet_sk(sk);
866 struct flowi4 *fl4 = &inet->cork.fl.u.ip4;
867 struct sk_buff *skb;
868 int err = 0;
869
870 skb = ip_finish_skb(sk, fl4);
871 if (!skb)
872 goto out;
873
874 err = udp_send_skb(skb, fl4);
875
876out:
877 up->len = 0;
878 up->pending = 0;
879 return err;
880}
881EXPORT_SYMBOL(udp_push_pending_frames);
882
883int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
884 size_t len)
885{
886 struct inet_sock *inet = inet_sk(sk);
887 struct udp_sock *up = udp_sk(sk);
888 struct flowi4 fl4_stack;
889 struct flowi4 *fl4;
890 int ulen = len;
891 struct ipcm_cookie ipc;
892 struct rtable *rt = NULL;
893 int free = 0;
894 int connected = 0;
895 __be32 daddr, faddr, saddr;
896 __be16 dport;
897 u8 tos;
898 int err, is_udplite = IS_UDPLITE(sk);
899 int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
900 int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
901 struct sk_buff *skb;
902 struct ip_options_data opt_copy;
903
904 if (len > 0xFFFF)
905 return -EMSGSIZE;
906
907
908
909
910
911 if (msg->msg_flags & MSG_OOB)
912 return -EOPNOTSUPP;
913
914 ipc.opt = NULL;
915 ipc.tx_flags = 0;
916 ipc.ttl = 0;
917 ipc.tos = -1;
918
919 getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
920
921 fl4 = &inet->cork.fl.u.ip4;
922 if (up->pending) {
923
924
925
926
927 lock_sock(sk);
928 if (likely(up->pending)) {
929 if (unlikely(up->pending != AF_INET)) {
930 release_sock(sk);
931 return -EINVAL;
932 }
933 goto do_append_data;
934 }
935 release_sock(sk);
936 }
937 ulen += sizeof(struct udphdr);
938
939
940
941
942 if (msg->msg_name) {
943 DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
944 if (msg->msg_namelen < sizeof(*usin))
945 return -EINVAL;
946 if (usin->sin_family != AF_INET) {
947 if (usin->sin_family != AF_UNSPEC)
948 return -EAFNOSUPPORT;
949 }
950
951 daddr = usin->sin_addr.s_addr;
952 dport = usin->sin_port;
953 if (dport == 0)
954 return -EINVAL;
955 } else {
956 if (sk->sk_state != TCP_ESTABLISHED)
957 return -EDESTADDRREQ;
958 daddr = inet->inet_daddr;
959 dport = inet->inet_dport;
960
961
962
963 connected = 1;
964 }
965 ipc.addr = inet->inet_saddr;
966
967 ipc.oif = sk->sk_bound_dev_if;
968
969 sock_tx_timestamp(sk, &ipc.tx_flags);
970
971 if (msg->msg_controllen) {
972 err = ip_cmsg_send(sock_net(sk), msg, &ipc,
973 sk->sk_family == AF_INET6);
974 if (err)
975 return err;
976 if (ipc.opt)
977 free = 1;
978 connected = 0;
979 }
980 if (!ipc.opt) {
981 struct ip_options_rcu *inet_opt;
982
983 rcu_read_lock();
984 inet_opt = rcu_dereference(inet->inet_opt);
985 if (inet_opt) {
986 memcpy(&opt_copy, inet_opt,
987 sizeof(*inet_opt) + inet_opt->opt.optlen);
988 ipc.opt = &opt_copy.opt;
989 }
990 rcu_read_unlock();
991 }
992
993 saddr = ipc.addr;
994 ipc.addr = faddr = daddr;
995
996 if (ipc.opt && ipc.opt->opt.srr) {
997 if (!daddr)
998 return -EINVAL;
999 faddr = ipc.opt->opt.faddr;
1000 connected = 0;
1001 }
1002 tos = get_rttos(&ipc, inet);
1003 if (sock_flag(sk, SOCK_LOCALROUTE) ||
1004 (msg->msg_flags & MSG_DONTROUTE) ||
1005 (ipc.opt && ipc.opt->opt.is_strictroute)) {
1006 tos |= RTO_ONLINK;
1007 connected = 0;
1008 }
1009
1010 if (ipv4_is_multicast(daddr)) {
1011 if (!ipc.oif)
1012 ipc.oif = inet->mc_index;
1013 if (!saddr)
1014 saddr = inet->mc_addr;
1015 connected = 0;
1016 } else if (!ipc.oif)
1017 ipc.oif = inet->uc_index;
1018
1019 if (connected)
1020 rt = (struct rtable *)sk_dst_check(sk, 0);
1021
1022 if (rt == NULL) {
1023 struct net *net = sock_net(sk);
1024
1025 fl4 = &fl4_stack;
1026 flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
1027 RT_SCOPE_UNIVERSE, sk->sk_protocol,
1028 inet_sk_flowi_flags(sk),
1029 faddr, saddr, dport, inet->inet_sport);
1030
1031 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
1032 rt = ip_route_output_flow(net, fl4, sk);
1033 if (IS_ERR(rt)) {
1034 err = PTR_ERR(rt);
1035 rt = NULL;
1036 if (err == -ENETUNREACH)
1037 IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
1038 goto out;
1039 }
1040
1041 err = -EACCES;
1042 if ((rt->rt_flags & RTCF_BROADCAST) &&
1043 !sock_flag(sk, SOCK_BROADCAST))
1044 goto out;
1045 if (connected)
1046 sk_dst_set(sk, dst_clone(&rt->dst));
1047 }
1048
1049 if (msg->msg_flags&MSG_CONFIRM)
1050 goto do_confirm;
1051back_from_confirm:
1052
1053 saddr = fl4->saddr;
1054 if (!ipc.addr)
1055 daddr = ipc.addr = fl4->daddr;
1056
1057
1058 if (!corkreq) {
1059 skb = ip_make_skb(sk, fl4, getfrag, msg->msg_iov, ulen,
1060 sizeof(struct udphdr), &ipc, &rt,
1061 msg->msg_flags);
1062 err = PTR_ERR(skb);
1063 if (!IS_ERR_OR_NULL(skb))
1064 err = udp_send_skb(skb, fl4);
1065 goto out;
1066 }
1067
1068 lock_sock(sk);
1069 if (unlikely(up->pending)) {
1070
1071
1072 release_sock(sk);
1073
1074 LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("cork app bug 2\n"));
1075 err = -EINVAL;
1076 goto out;
1077 }
1078
1079
1080
1081 fl4 = &inet->cork.fl.u.ip4;
1082 fl4->daddr = daddr;
1083 fl4->saddr = saddr;
1084 fl4->fl4_dport = dport;
1085 fl4->fl4_sport = inet->inet_sport;
1086 up->pending = AF_INET;
1087
1088do_append_data:
1089 up->len += ulen;
1090 err = ip_append_data(sk, fl4, getfrag, msg->msg_iov, ulen,
1091 sizeof(struct udphdr), &ipc, &rt,
1092 corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
1093 if (err)
1094 udp_flush_pending_frames(sk);
1095 else if (!corkreq)
1096 err = udp_push_pending_frames(sk);
1097 else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
1098 up->pending = 0;
1099 release_sock(sk);
1100
1101out:
1102 ip_rt_put(rt);
1103 if (free)
1104 kfree(ipc.opt);
1105 if (!err)
1106 return len;
1107
1108
1109
1110
1111
1112
1113
1114 if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
1115 UDP_INC_STATS_USER(sock_net(sk),
1116 UDP_MIB_SNDBUFERRORS, is_udplite);
1117 }
1118 return err;
1119
1120do_confirm:
1121 dst_confirm(&rt->dst);
1122 if (!(msg->msg_flags&MSG_PROBE) || len)
1123 goto back_from_confirm;
1124 err = 0;
1125 goto out;
1126}
1127EXPORT_SYMBOL(udp_sendmsg);
1128
1129int udp_sendpage(struct sock *sk, struct page *page, int offset,
1130 size_t size, int flags)
1131{
1132 struct inet_sock *inet = inet_sk(sk);
1133 struct udp_sock *up = udp_sk(sk);
1134 int ret;
1135
1136 if (flags & MSG_SENDPAGE_NOTLAST)
1137 flags |= MSG_MORE;
1138
1139 if (!up->pending) {
1140 struct msghdr msg = { .msg_flags = flags|MSG_MORE };
1141
1142
1143
1144
1145
1146 ret = udp_sendmsg(NULL, sk, &msg, 0);
1147 if (ret < 0)
1148 return ret;
1149 }
1150
1151 lock_sock(sk);
1152
1153 if (unlikely(!up->pending)) {
1154 release_sock(sk);
1155
1156 LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("udp cork app bug 3\n"));
1157 return -EINVAL;
1158 }
1159
1160 ret = ip_append_page(sk, &inet->cork.fl.u.ip4,
1161 page, offset, size, flags);
1162 if (ret == -EOPNOTSUPP) {
1163 release_sock(sk);
1164 return sock_no_sendpage(sk->sk_socket, page, offset,
1165 size, flags);
1166 }
1167 if (ret < 0) {
1168 udp_flush_pending_frames(sk);
1169 goto out;
1170 }
1171
1172 up->len += size;
1173 if (!(up->corkflag || (flags&MSG_MORE)))
1174 ret = udp_push_pending_frames(sk);
1175 if (!ret)
1176 ret = size;
1177out:
1178 release_sock(sk);
1179 return ret;
1180}
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190static unsigned int first_packet_length(struct sock *sk)
1191{
1192 struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue;
1193 struct sk_buff *skb;
1194 unsigned int res;
1195
1196 __skb_queue_head_init(&list_kill);
1197
1198 spin_lock_bh(&rcvq->lock);
1199 while ((skb = skb_peek(rcvq)) != NULL &&
1200 udp_lib_checksum_complete(skb)) {
1201 UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS,
1202 IS_UDPLITE(sk));
1203 UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
1204 IS_UDPLITE(sk));
1205 atomic_inc(&sk->sk_drops);
1206 __skb_unlink(skb, rcvq);
1207 __skb_queue_tail(&list_kill, skb);
1208 }
1209 res = skb ? skb->len : 0;
1210 spin_unlock_bh(&rcvq->lock);
1211
1212 if (!skb_queue_empty(&list_kill)) {
1213 bool slow = lock_sock_fast(sk);
1214
1215 __skb_queue_purge(&list_kill);
1216 sk_mem_reclaim_partial(sk);
1217 unlock_sock_fast(sk, slow);
1218 }
1219 return res;
1220}
1221
1222
1223
1224
1225
1226int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
1227{
1228 switch (cmd) {
1229 case SIOCOUTQ:
1230 {
1231 int amount = sk_wmem_alloc_get(sk);
1232
1233 return put_user(amount, (int __user *)arg);
1234 }
1235
1236 case SIOCINQ:
1237 {
1238 unsigned int amount = first_packet_length(sk);
1239
1240 if (amount)
1241
1242
1243
1244
1245
1246 amount -= sizeof(struct udphdr);
1247
1248 return put_user(amount, (int __user *)arg);
1249 }
1250
1251 default:
1252 return -ENOIOCTLCMD;
1253 }
1254
1255 return 0;
1256}
1257EXPORT_SYMBOL(udp_ioctl);
1258
1259
1260
1261
1262
1263
1264int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
1265 size_t len, int noblock, int flags, int *addr_len)
1266{
1267 struct inet_sock *inet = inet_sk(sk);
1268 DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
1269 struct sk_buff *skb;
1270 unsigned int ulen, copied;
1271 int peeked, off = 0;
1272 int err;
1273 int is_udplite = IS_UDPLITE(sk);
1274 bool slow;
1275
1276 if (flags & MSG_ERRQUEUE)
1277 return ip_recv_error(sk, msg, len, addr_len);
1278
1279try_again:
1280 skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0),
1281 &peeked, &off, &err);
1282 if (!skb)
1283 goto out;
1284
1285 ulen = skb->len - sizeof(struct udphdr);
1286 copied = len;
1287 if (copied > ulen)
1288 copied = ulen;
1289 else if (copied < ulen)
1290 msg->msg_flags |= MSG_TRUNC;
1291
1292
1293
1294
1295
1296
1297
1298 if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) {
1299 if (udp_lib_checksum_complete(skb))
1300 goto csum_copy_err;
1301 }
1302
1303 if (skb_csum_unnecessary(skb))
1304 err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr),
1305 msg->msg_iov, copied);
1306 else {
1307 err = skb_copy_and_csum_datagram_iovec(skb,
1308 sizeof(struct udphdr),
1309 msg->msg_iov);
1310
1311 if (err == -EINVAL)
1312 goto csum_copy_err;
1313 }
1314
1315 if (unlikely(err)) {
1316 trace_kfree_skb(skb, udp_recvmsg);
1317 if (!peeked) {
1318 atomic_inc(&sk->sk_drops);
1319 UDP_INC_STATS_USER(sock_net(sk),
1320 UDP_MIB_INERRORS, is_udplite);
1321 }
1322 goto out_free;
1323 }
1324
1325 if (!peeked)
1326 UDP_INC_STATS_USER(sock_net(sk),
1327 UDP_MIB_INDATAGRAMS, is_udplite);
1328
1329 sock_recv_ts_and_drops(msg, sk, skb);
1330
1331
1332 if (sin) {
1333 sin->sin_family = AF_INET;
1334 sin->sin_port = udp_hdr(skb)->source;
1335 sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
1336 memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
1337 *addr_len = sizeof(*sin);
1338 }
1339 if (inet->cmsg_flags)
1340 ip_cmsg_recv(msg, skb);
1341
1342 err = copied;
1343 if (flags & MSG_TRUNC)
1344 err = ulen;
1345
1346out_free:
1347 skb_free_datagram_locked(sk, skb);
1348out:
1349 return err;
1350
1351csum_copy_err:
1352 slow = lock_sock_fast(sk);
1353 if (!skb_kill_datagram(sk, skb, flags)) {
1354 UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
1355 UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
1356 }
1357 unlock_sock_fast(sk, slow);
1358
1359 if (noblock)
1360 return -EAGAIN;
1361
1362
1363 msg->msg_flags &= ~MSG_TRUNC;
1364 goto try_again;
1365}
1366
1367
1368int udp_disconnect(struct sock *sk, int flags)
1369{
1370 struct inet_sock *inet = inet_sk(sk);
1371
1372
1373
1374
1375 sk->sk_state = TCP_CLOSE;
1376 inet->inet_daddr = 0;
1377 inet->inet_dport = 0;
1378 sock_rps_reset_rxhash(sk);
1379 sk->sk_bound_dev_if = 0;
1380 if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
1381 inet_reset_saddr(sk);
1382
1383 if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) {
1384 sk->sk_prot->unhash(sk);
1385 inet->inet_sport = 0;
1386 }
1387 sk_dst_reset(sk);
1388 return 0;
1389}
1390EXPORT_SYMBOL(udp_disconnect);
1391
1392void udp_lib_unhash(struct sock *sk)
1393{
1394 if (sk_hashed(sk)) {
1395 struct udp_table *udptable = sk->sk_prot->h.udp_table;
1396 struct udp_hslot *hslot, *hslot2;
1397
1398 hslot = udp_hashslot(udptable, sock_net(sk),
1399 udp_sk(sk)->udp_port_hash);
1400 hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
1401
1402 spin_lock_bh(&hslot->lock);
1403 if (sk_nulls_del_node_init_rcu(sk)) {
1404 hslot->count--;
1405 inet_sk(sk)->inet_num = 0;
1406 sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
1407
1408 spin_lock(&hslot2->lock);
1409 hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
1410 hslot2->count--;
1411 spin_unlock(&hslot2->lock);
1412 }
1413 spin_unlock_bh(&hslot->lock);
1414 }
1415}
1416EXPORT_SYMBOL(udp_lib_unhash);
1417
1418
1419
1420
1421void udp_lib_rehash(struct sock *sk, u16 newhash)
1422{
1423 if (sk_hashed(sk)) {
1424 struct udp_table *udptable = sk->sk_prot->h.udp_table;
1425 struct udp_hslot *hslot, *hslot2, *nhslot2;
1426
1427 hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
1428 nhslot2 = udp_hashslot2(udptable, newhash);
1429 udp_sk(sk)->udp_portaddr_hash = newhash;
1430 if (hslot2 != nhslot2) {
1431 hslot = udp_hashslot(udptable, sock_net(sk),
1432 udp_sk(sk)->udp_port_hash);
1433
1434 spin_lock_bh(&hslot->lock);
1435
1436 spin_lock(&hslot2->lock);
1437 hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
1438 hslot2->count--;
1439 spin_unlock(&hslot2->lock);
1440
1441 spin_lock(&nhslot2->lock);
1442 hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
1443 &nhslot2->head);
1444 nhslot2->count++;
1445 spin_unlock(&nhslot2->lock);
1446
1447 spin_unlock_bh(&hslot->lock);
1448 }
1449 }
1450}
1451EXPORT_SYMBOL(udp_lib_rehash);
1452
1453static void udp_v4_rehash(struct sock *sk)
1454{
1455 u16 new_hash = udp4_portaddr_hash(sock_net(sk),
1456 inet_sk(sk)->inet_rcv_saddr,
1457 inet_sk(sk)->inet_num);
1458 udp_lib_rehash(sk, new_hash);
1459}
1460
1461static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
1462{
1463 int rc;
1464
1465 if (inet_sk(sk)->inet_daddr) {
1466 sock_rps_save_rxhash(sk, skb);
1467 sk_mark_napi_id(sk, skb);
1468 }
1469
1470 rc = sock_queue_rcv_skb(sk, skb);
1471 if (rc < 0) {
1472 int is_udplite = IS_UDPLITE(sk);
1473
1474
1475 if (rc == -ENOMEM)
1476 UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
1477 is_udplite);
1478 UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
1479 kfree_skb(skb);
1480 trace_udp_fail_queue_rcv_skb(rc, sk);
1481 return -1;
1482 }
1483
1484 return 0;
1485
1486}
1487
1488static struct static_key udp_encap_needed __read_mostly;
1489void udp_encap_enable(void)
1490{
1491 if (!static_key_enabled(&udp_encap_needed))
1492 static_key_slow_inc(&udp_encap_needed);
1493}
1494EXPORT_SYMBOL(udp_encap_enable);
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
1505{
1506 struct udp_sock *up = udp_sk(sk);
1507 int rc;
1508 int is_udplite = IS_UDPLITE(sk);
1509
1510
1511
1512
1513 if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
1514 goto drop;
1515 nf_reset(skb);
1516
1517 if (static_key_false(&udp_encap_needed) && up->encap_type) {
1518 int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532 encap_rcv = ACCESS_ONCE(up->encap_rcv);
1533 if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) {
1534 int ret;
1535
1536
1537 if (udp_lib_checksum_complete(skb))
1538 goto csum_error;
1539
1540 ret = encap_rcv(sk, skb);
1541 if (ret <= 0) {
1542 UDP_INC_STATS_BH(sock_net(sk),
1543 UDP_MIB_INDATAGRAMS,
1544 is_udplite);
1545 return -ret;
1546 }
1547 }
1548
1549
1550 }
1551
1552
1553
1554
1555 if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568 if (up->pcrlen == 0) {
1569 LIMIT_NETDEBUG(KERN_WARNING "UDPLite: partial coverage %d while full coverage %d requested\n",
1570 UDP_SKB_CB(skb)->cscov, skb->len);
1571 goto drop;
1572 }
1573
1574
1575
1576
1577
1578
1579 if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
1580 LIMIT_NETDEBUG(KERN_WARNING "UDPLite: coverage %d too small, need min %d\n",
1581 UDP_SKB_CB(skb)->cscov, up->pcrlen);
1582 goto drop;
1583 }
1584 }
1585
1586 if (rcu_access_pointer(sk->sk_filter) &&
1587 udp_lib_checksum_complete(skb))
1588 goto csum_error;
1589
1590
1591 if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) {
1592 UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
1593 is_udplite);
1594 goto drop;
1595 }
1596
1597 rc = 0;
1598
1599 ipv4_pktinfo_prepare(sk, skb);
1600 bh_lock_sock(sk);
1601 if (!sock_owned_by_user(sk))
1602 rc = __udp_queue_rcv_skb(sk, skb);
1603 else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) {
1604 bh_unlock_sock(sk);
1605 goto drop;
1606 }
1607 bh_unlock_sock(sk);
1608
1609 return rc;
1610
1611csum_error:
1612 UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
1613drop:
1614 UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
1615 atomic_inc(&sk->sk_drops);
1616 kfree_skb(skb);
1617 return -1;
1618}
1619
1620
1621static void flush_stack(struct sock **stack, unsigned int count,
1622 struct sk_buff *skb, unsigned int final)
1623{
1624 unsigned int i;
1625 struct sk_buff *skb1 = NULL;
1626 struct sock *sk;
1627
1628 for (i = 0; i < count; i++) {
1629 sk = stack[i];
1630 if (likely(skb1 == NULL))
1631 skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC);
1632
1633 if (!skb1) {
1634 atomic_inc(&sk->sk_drops);
1635 UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS,
1636 IS_UDPLITE(sk));
1637 UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS,
1638 IS_UDPLITE(sk));
1639 }
1640
1641 if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0)
1642 skb1 = NULL;
1643 }
1644 if (unlikely(skb1))
1645 kfree_skb(skb1);
1646}
1647
1648
1649
1650
1651static void udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
1652{
1653 struct dst_entry *old;
1654
1655 dst_hold(dst);
1656 old = xchg(&sk->sk_rx_dst, dst);
1657 dst_release(old);
1658}
1659
1660
1661
1662
1663
1664
1665static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
1666 struct udphdr *uh,
1667 __be32 saddr, __be32 daddr,
1668 struct udp_table *udptable)
1669{
1670 struct sock *sk, *stack[256 / sizeof(struct sock *)];
1671 struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest));
1672 int dif;
1673 unsigned int i, count = 0;
1674
1675 spin_lock(&hslot->lock);
1676 sk = sk_nulls_head(&hslot->head);
1677 dif = skb->dev->ifindex;
1678 sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif);
1679 while (sk) {
1680 stack[count++] = sk;
1681 sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest,
1682 daddr, uh->source, saddr, dif);
1683 if (unlikely(count == ARRAY_SIZE(stack))) {
1684 if (!sk)
1685 break;
1686 flush_stack(stack, count, skb, ~0);
1687 count = 0;
1688 }
1689 }
1690
1691
1692
1693 for (i = 0; i < count; i++)
1694 sock_hold(stack[i]);
1695
1696 spin_unlock(&hslot->lock);
1697
1698
1699
1700
1701 if (count) {
1702 flush_stack(stack, count, skb, count - 1);
1703
1704 for (i = 0; i < count; i++)
1705 sock_put(stack[i]);
1706 } else {
1707 kfree_skb(skb);
1708 }
1709 return 0;
1710}
1711
1712
1713
1714
1715
1716
1717static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
1718 int proto)
1719{
1720 int err;
1721
1722 UDP_SKB_CB(skb)->partial_cov = 0;
1723 UDP_SKB_CB(skb)->cscov = skb->len;
1724
1725 if (proto == IPPROTO_UDPLITE) {
1726 err = udplite_checksum_init(skb, uh);
1727 if (err)
1728 return err;
1729 }
1730
1731 return skb_checksum_init_zero_check(skb, proto, uh->check,
1732 inet_compute_pseudo);
1733}
1734
1735
1736
1737
1738
1739int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
1740 int proto)
1741{
1742 struct sock *sk;
1743 struct udphdr *uh;
1744 unsigned short ulen;
1745 struct rtable *rt = skb_rtable(skb);
1746 __be32 saddr, daddr;
1747 struct net *net = dev_net(skb->dev);
1748
1749
1750
1751
1752 if (!pskb_may_pull(skb, sizeof(struct udphdr)))
1753 goto drop;
1754
1755 uh = udp_hdr(skb);
1756 ulen = ntohs(uh->len);
1757 saddr = ip_hdr(skb)->saddr;
1758 daddr = ip_hdr(skb)->daddr;
1759
1760 if (ulen > skb->len)
1761 goto short_packet;
1762
1763 if (proto == IPPROTO_UDP) {
1764
1765 if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
1766 goto short_packet;
1767 uh = udp_hdr(skb);
1768 }
1769
1770 if (udp4_csum_init(skb, uh, proto))
1771 goto csum_error;
1772
1773 sk = skb_steal_sock(skb);
1774 if (sk) {
1775 struct dst_entry *dst = skb_dst(skb);
1776 int ret;
1777
1778 if (unlikely(sk->sk_rx_dst != dst))
1779 udp_sk_rx_dst_set(sk, dst);
1780
1781 ret = udp_queue_rcv_skb(sk, skb);
1782 sock_put(sk);
1783
1784
1785
1786 if (ret > 0)
1787 return -ret;
1788 return 0;
1789 } else {
1790 if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
1791 return __udp4_lib_mcast_deliver(net, skb, uh,
1792 saddr, daddr, udptable);
1793
1794 sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
1795 }
1796
1797 if (sk != NULL) {
1798 int ret;
1799
1800 ret = udp_queue_rcv_skb(sk, skb);
1801 sock_put(sk);
1802
1803
1804
1805
1806 if (ret > 0)
1807 return -ret;
1808 return 0;
1809 }
1810
1811 if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
1812 goto drop;
1813 nf_reset(skb);
1814
1815
1816 if (udp_lib_checksum_complete(skb))
1817 goto csum_error;
1818
1819 UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
1820 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
1821
1822
1823
1824
1825
1826 kfree_skb(skb);
1827 return 0;
1828
1829short_packet:
1830 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n",
1831 proto == IPPROTO_UDPLITE ? "Lite" : "",
1832 &saddr, ntohs(uh->source),
1833 ulen, skb->len,
1834 &daddr, ntohs(uh->dest));
1835 goto drop;
1836
1837csum_error:
1838
1839
1840
1841
1842 LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n",
1843 proto == IPPROTO_UDPLITE ? "Lite" : "",
1844 &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest),
1845 ulen);
1846 UDP_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
1847drop:
1848 UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
1849 kfree_skb(skb);
1850 return 0;
1851}
1852
1853
1854
1855
1856static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net,
1857 __be16 loc_port, __be32 loc_addr,
1858 __be16 rmt_port, __be32 rmt_addr,
1859 int dif)
1860{
1861 struct sock *sk, *result;
1862 struct hlist_nulls_node *node;
1863 unsigned short hnum = ntohs(loc_port);
1864 unsigned int count, slot = udp_hashfn(net, hnum, udp_table.mask);
1865 struct udp_hslot *hslot = &udp_table.hash[slot];
1866
1867
1868 if (hslot->count > 10)
1869 return NULL;
1870
1871 rcu_read_lock();
1872begin:
1873 count = 0;
1874 result = NULL;
1875 sk_nulls_for_each_rcu(sk, node, &hslot->head) {
1876 if (__udp_is_mcast_sock(net, sk,
1877 loc_port, loc_addr,
1878 rmt_port, rmt_addr,
1879 dif, hnum)) {
1880 result = sk;
1881 ++count;
1882 }
1883 }
1884
1885
1886
1887
1888
1889 if (get_nulls_value(node) != slot)
1890 goto begin;
1891
1892 if (result) {
1893 if (count != 1 ||
1894 unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
1895 result = NULL;
1896 else if (unlikely(!__udp_is_mcast_sock(net, result,
1897 loc_port, loc_addr,
1898 rmt_port, rmt_addr,
1899 dif, hnum))) {
1900 sock_put(result);
1901 result = NULL;
1902 }
1903 }
1904 rcu_read_unlock();
1905 return result;
1906}
1907
1908
1909
1910
1911
1912static struct sock *__udp4_lib_demux_lookup(struct net *net,
1913 __be16 loc_port, __be32 loc_addr,
1914 __be16 rmt_port, __be32 rmt_addr,
1915 int dif)
1916{
1917 struct sock *sk, *result;
1918 struct hlist_nulls_node *node;
1919 unsigned short hnum = ntohs(loc_port);
1920 unsigned int hash2 = udp4_portaddr_hash(net, loc_addr, hnum);
1921 unsigned int slot2 = hash2 & udp_table.mask;
1922 struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
1923 INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr);
1924 const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
1925
1926 rcu_read_lock();
1927 result = NULL;
1928 udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) {
1929 if (INET_MATCH(sk, net, acookie,
1930 rmt_addr, loc_addr, ports, dif))
1931 result = sk;
1932
1933 break;
1934 }
1935
1936 if (result) {
1937 if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2)))
1938 result = NULL;
1939 else if (unlikely(!INET_MATCH(sk, net, acookie,
1940 rmt_addr, loc_addr,
1941 ports, dif))) {
1942 sock_put(result);
1943 result = NULL;
1944 }
1945 }
1946 rcu_read_unlock();
1947 return result;
1948}
1949
1950void udp_v4_early_demux(struct sk_buff *skb)
1951{
1952 struct net *net = dev_net(skb->dev);
1953 const struct iphdr *iph;
1954 const struct udphdr *uh;
1955 struct sock *sk;
1956 struct dst_entry *dst;
1957 int dif = skb->dev->ifindex;
1958
1959
1960 if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct udphdr)))
1961 return;
1962
1963 iph = ip_hdr(skb);
1964 uh = udp_hdr(skb);
1965
1966 if (skb->pkt_type == PACKET_BROADCAST ||
1967 skb->pkt_type == PACKET_MULTICAST)
1968 sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr,
1969 uh->source, iph->saddr, dif);
1970 else if (skb->pkt_type == PACKET_HOST)
1971 sk = __udp4_lib_demux_lookup(net, uh->dest, iph->daddr,
1972 uh->source, iph->saddr, dif);
1973 else
1974 return;
1975
1976 if (!sk)
1977 return;
1978
1979 skb->sk = sk;
1980 skb->destructor = sock_edemux;
1981 dst = sk->sk_rx_dst;
1982
1983 if (dst)
1984 dst = dst_check(dst, 0);
1985 if (dst)
1986 skb_dst_set_noref(skb, dst);
1987}
1988
1989int udp_rcv(struct sk_buff *skb)
1990{
1991 return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP);
1992}
1993
1994void udp_destroy_sock(struct sock *sk)
1995{
1996 struct udp_sock *up = udp_sk(sk);
1997 bool slow = lock_sock_fast(sk);
1998 udp_flush_pending_frames(sk);
1999 unlock_sock_fast(sk, slow);
2000 if (static_key_false(&udp_encap_needed) && up->encap_type) {
2001 void (*encap_destroy)(struct sock *sk);
2002 encap_destroy = ACCESS_ONCE(up->encap_destroy);
2003 if (encap_destroy)
2004 encap_destroy(sk);
2005 }
2006}
2007
2008
2009
2010
2011int udp_lib_setsockopt(struct sock *sk, int level, int optname,
2012 char __user *optval, unsigned int optlen,
2013 int (*push_pending_frames)(struct sock *))
2014{
2015 struct udp_sock *up = udp_sk(sk);
2016 int val, valbool;
2017 int err = 0;
2018 int is_udplite = IS_UDPLITE(sk);
2019
2020 if (optlen < sizeof(int))
2021 return -EINVAL;
2022
2023 if (get_user(val, (int __user *)optval))
2024 return -EFAULT;
2025
2026 valbool = val ? 1 : 0;
2027
2028 switch (optname) {
2029 case UDP_CORK:
2030 if (val != 0) {
2031 up->corkflag = 1;
2032 } else {
2033 up->corkflag = 0;
2034 lock_sock(sk);
2035 (*push_pending_frames)(sk);
2036 release_sock(sk);
2037 }
2038 break;
2039
2040 case UDP_ENCAP:
2041 switch (val) {
2042 case 0:
2043 case UDP_ENCAP_ESPINUDP:
2044 case UDP_ENCAP_ESPINUDP_NON_IKE:
2045 up->encap_rcv = xfrm4_udp_encap_rcv;
2046
2047 case UDP_ENCAP_L2TPINUDP:
2048 up->encap_type = val;
2049 udp_encap_enable();
2050 break;
2051 default:
2052 err = -ENOPROTOOPT;
2053 break;
2054 }
2055 break;
2056
2057 case UDP_NO_CHECK6_TX:
2058 up->no_check6_tx = valbool;
2059 break;
2060
2061 case UDP_NO_CHECK6_RX:
2062 up->no_check6_rx = valbool;
2063 break;
2064
2065
2066
2067
2068
2069
2070 case UDPLITE_SEND_CSCOV:
2071 if (!is_udplite)
2072 return -ENOPROTOOPT;
2073 if (val != 0 && val < 8)
2074 val = 8;
2075 else if (val > USHRT_MAX)
2076 val = USHRT_MAX;
2077 up->pcslen = val;
2078 up->pcflag |= UDPLITE_SEND_CC;
2079 break;
2080
2081
2082
2083
2084 case UDPLITE_RECV_CSCOV:
2085 if (!is_udplite)
2086 return -ENOPROTOOPT;
2087 if (val != 0 && val < 8)
2088 val = 8;
2089 else if (val > USHRT_MAX)
2090 val = USHRT_MAX;
2091 up->pcrlen = val;
2092 up->pcflag |= UDPLITE_RECV_CC;
2093 break;
2094
2095 default:
2096 err = -ENOPROTOOPT;
2097 break;
2098 }
2099
2100 return err;
2101}
2102EXPORT_SYMBOL(udp_lib_setsockopt);
2103
2104int udp_setsockopt(struct sock *sk, int level, int optname,
2105 char __user *optval, unsigned int optlen)
2106{
2107 if (level == SOL_UDP || level == SOL_UDPLITE)
2108 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
2109 udp_push_pending_frames);
2110 return ip_setsockopt(sk, level, optname, optval, optlen);
2111}
2112
2113#ifdef CONFIG_COMPAT
2114int compat_udp_setsockopt(struct sock *sk, int level, int optname,
2115 char __user *optval, unsigned int optlen)
2116{
2117 if (level == SOL_UDP || level == SOL_UDPLITE)
2118 return udp_lib_setsockopt(sk, level, optname, optval, optlen,
2119 udp_push_pending_frames);
2120 return compat_ip_setsockopt(sk, level, optname, optval, optlen);
2121}
2122#endif
2123
2124int udp_lib_getsockopt(struct sock *sk, int level, int optname,
2125 char __user *optval, int __user *optlen)
2126{
2127 struct udp_sock *up = udp_sk(sk);
2128 int val, len;
2129
2130 if (get_user(len, optlen))
2131 return -EFAULT;
2132
2133 len = min_t(unsigned int, len, sizeof(int));
2134
2135 if (len < 0)
2136 return -EINVAL;
2137
2138 switch (optname) {
2139 case UDP_CORK:
2140 val = up->corkflag;
2141 break;
2142
2143 case UDP_ENCAP:
2144 val = up->encap_type;
2145 break;
2146
2147 case UDP_NO_CHECK6_TX:
2148 val = up->no_check6_tx;
2149 break;
2150
2151 case UDP_NO_CHECK6_RX:
2152 val = up->no_check6_rx;
2153 break;
2154
2155
2156
2157 case UDPLITE_SEND_CSCOV:
2158 val = up->pcslen;
2159 break;
2160
2161 case UDPLITE_RECV_CSCOV:
2162 val = up->pcrlen;
2163 break;
2164
2165 default:
2166 return -ENOPROTOOPT;
2167 }
2168
2169 if (put_user(len, optlen))
2170 return -EFAULT;
2171 if (copy_to_user(optval, &val, len))
2172 return -EFAULT;
2173 return 0;
2174}
2175EXPORT_SYMBOL(udp_lib_getsockopt);
2176
2177int udp_getsockopt(struct sock *sk, int level, int optname,
2178 char __user *optval, int __user *optlen)
2179{
2180 if (level == SOL_UDP || level == SOL_UDPLITE)
2181 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
2182 return ip_getsockopt(sk, level, optname, optval, optlen);
2183}
2184
2185#ifdef CONFIG_COMPAT
2186int compat_udp_getsockopt(struct sock *sk, int level, int optname,
2187 char __user *optval, int __user *optlen)
2188{
2189 if (level == SOL_UDP || level == SOL_UDPLITE)
2190 return udp_lib_getsockopt(sk, level, optname, optval, optlen);
2191 return compat_ip_getsockopt(sk, level, optname, optval, optlen);
2192}
2193#endif
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
2208{
2209 unsigned int mask = datagram_poll(file, sock, wait);
2210 struct sock *sk = sock->sk;
2211
2212 sock_rps_record_flow(sk);
2213
2214
2215 if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) &&
2216 !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk))
2217 mask &= ~(POLLIN | POLLRDNORM);
2218
2219 return mask;
2220
2221}
2222EXPORT_SYMBOL(udp_poll);
2223
2224struct proto udp_prot = {
2225 .name = "UDP",
2226 .owner = THIS_MODULE,
2227 .close = udp_lib_close,
2228 .connect = ip4_datagram_connect,
2229 .disconnect = udp_disconnect,
2230 .ioctl = udp_ioctl,
2231 .destroy = udp_destroy_sock,
2232 .setsockopt = udp_setsockopt,
2233 .getsockopt = udp_getsockopt,
2234 .sendmsg = udp_sendmsg,
2235 .recvmsg = udp_recvmsg,
2236 .sendpage = udp_sendpage,
2237 .backlog_rcv = __udp_queue_rcv_skb,
2238 .release_cb = ip4_datagram_release_cb,
2239 .hash = udp_lib_hash,
2240 .unhash = udp_lib_unhash,
2241 .rehash = udp_v4_rehash,
2242 .get_port = udp_v4_get_port,
2243 .memory_allocated = &udp_memory_allocated,
2244 .sysctl_mem = sysctl_udp_mem,
2245 .sysctl_wmem = &sysctl_udp_wmem_min,
2246 .sysctl_rmem = &sysctl_udp_rmem_min,
2247 .obj_size = sizeof(struct udp_sock),
2248 .slab_flags = SLAB_DESTROY_BY_RCU,
2249 .h.udp_table = &udp_table,
2250#ifdef CONFIG_COMPAT
2251 .compat_setsockopt = compat_udp_setsockopt,
2252 .compat_getsockopt = compat_udp_getsockopt,
2253#endif
2254 .clear_sk = sk_prot_clear_portaddr_nulls,
2255};
2256EXPORT_SYMBOL(udp_prot);
2257
2258
2259#ifdef CONFIG_PROC_FS
2260
2261static struct sock *udp_get_first(struct seq_file *seq, int start)
2262{
2263 struct sock *sk;
2264 struct udp_iter_state *state = seq->private;
2265 struct net *net = seq_file_net(seq);
2266
2267 for (state->bucket = start; state->bucket <= state->udp_table->mask;
2268 ++state->bucket) {
2269 struct hlist_nulls_node *node;
2270 struct udp_hslot *hslot = &state->udp_table->hash[state->bucket];
2271
2272 if (hlist_nulls_empty(&hslot->head))
2273 continue;
2274
2275 spin_lock_bh(&hslot->lock);
2276 sk_nulls_for_each(sk, node, &hslot->head) {
2277 if (!net_eq(sock_net(sk), net))
2278 continue;
2279 if (sk->sk_family == state->family)
2280 goto found;
2281 }
2282 spin_unlock_bh(&hslot->lock);
2283 }
2284 sk = NULL;
2285found:
2286 return sk;
2287}
2288
2289static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
2290{
2291 struct udp_iter_state *state = seq->private;
2292 struct net *net = seq_file_net(seq);
2293
2294 do {
2295 sk = sk_nulls_next(sk);
2296 } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family));
2297
2298 if (!sk) {
2299 if (state->bucket <= state->udp_table->mask)
2300 spin_unlock_bh(&state->udp_table->hash[state->bucket].lock);
2301 return udp_get_first(seq, state->bucket + 1);
2302 }
2303 return sk;
2304}
2305
2306static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos)
2307{
2308 struct sock *sk = udp_get_first(seq, 0);
2309
2310 if (sk)
2311 while (pos && (sk = udp_get_next(seq, sk)) != NULL)
2312 --pos;
2313 return pos ? NULL : sk;
2314}
2315
2316static void *udp_seq_start(struct seq_file *seq, loff_t *pos)
2317{
2318 struct udp_iter_state *state = seq->private;
2319 state->bucket = MAX_UDP_PORTS;
2320
2321 return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
2322}
2323
2324static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
2325{
2326 struct sock *sk;
2327
2328 if (v == SEQ_START_TOKEN)
2329 sk = udp_get_idx(seq, 0);
2330 else
2331 sk = udp_get_next(seq, v);
2332
2333 ++*pos;
2334 return sk;
2335}
2336
2337static void udp_seq_stop(struct seq_file *seq, void *v)
2338{
2339 struct udp_iter_state *state = seq->private;
2340
2341 if (state->bucket <= state->udp_table->mask)
2342 spin_unlock_bh(&state->udp_table->hash[state->bucket].lock);
2343}
2344
2345int udp_seq_open(struct inode *inode, struct file *file)
2346{
2347 struct udp_seq_afinfo *afinfo = PDE_DATA(inode);
2348 struct udp_iter_state *s;
2349 int err;
2350
2351 err = seq_open_net(inode, file, &afinfo->seq_ops,
2352 sizeof(struct udp_iter_state));
2353 if (err < 0)
2354 return err;
2355
2356 s = ((struct seq_file *)file->private_data)->private;
2357 s->family = afinfo->family;
2358 s->udp_table = afinfo->udp_table;
2359 return err;
2360}
2361EXPORT_SYMBOL(udp_seq_open);
2362
2363
2364int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo)
2365{
2366 struct proc_dir_entry *p;
2367 int rc = 0;
2368
2369 afinfo->seq_ops.start = udp_seq_start;
2370 afinfo->seq_ops.next = udp_seq_next;
2371 afinfo->seq_ops.stop = udp_seq_stop;
2372
2373 p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
2374 afinfo->seq_fops, afinfo);
2375 if (!p)
2376 rc = -ENOMEM;
2377 return rc;
2378}
2379EXPORT_SYMBOL(udp_proc_register);
2380
2381void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo)
2382{
2383 remove_proc_entry(afinfo->name, net->proc_net);
2384}
2385EXPORT_SYMBOL(udp_proc_unregister);
2386
2387
2388static void udp4_format_sock(struct sock *sp, struct seq_file *f,
2389 int bucket)
2390{
2391 struct inet_sock *inet = inet_sk(sp);
2392 __be32 dest = inet->inet_daddr;
2393 __be32 src = inet->inet_rcv_saddr;
2394 __u16 destp = ntohs(inet->inet_dport);
2395 __u16 srcp = ntohs(inet->inet_sport);
2396
2397 seq_printf(f, "%5d: %08X:%04X %08X:%04X"
2398 " %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
2399 bucket, src, srcp, dest, destp, sp->sk_state,
2400 sk_wmem_alloc_get(sp),
2401 sk_rmem_alloc_get(sp),
2402 0, 0L, 0,
2403 from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
2404 0, sock_i_ino(sp),
2405 atomic_read(&sp->sk_refcnt), sp,
2406 atomic_read(&sp->sk_drops));
2407}
2408
2409int udp4_seq_show(struct seq_file *seq, void *v)
2410{
2411 seq_setwidth(seq, 127);
2412 if (v == SEQ_START_TOKEN)
2413 seq_puts(seq, " sl local_address rem_address st tx_queue "
2414 "rx_queue tr tm->when retrnsmt uid timeout "
2415 "inode ref pointer drops");
2416 else {
2417 struct udp_iter_state *state = seq->private;
2418
2419 udp4_format_sock(v, seq, state->bucket);
2420 }
2421 seq_pad(seq, '\n');
2422 return 0;
2423}
2424
2425static const struct file_operations udp_afinfo_seq_fops = {
2426 .owner = THIS_MODULE,
2427 .open = udp_seq_open,
2428 .read = seq_read,
2429 .llseek = seq_lseek,
2430 .release = seq_release_net
2431};
2432
2433
2434static struct udp_seq_afinfo udp4_seq_afinfo = {
2435 .name = "udp",
2436 .family = AF_INET,
2437 .udp_table = &udp_table,
2438 .seq_fops = &udp_afinfo_seq_fops,
2439 .seq_ops = {
2440 .show = udp4_seq_show,
2441 },
2442};
2443
2444static int __net_init udp4_proc_init_net(struct net *net)
2445{
2446 return udp_proc_register(net, &udp4_seq_afinfo);
2447}
2448
2449static void __net_exit udp4_proc_exit_net(struct net *net)
2450{
2451 udp_proc_unregister(net, &udp4_seq_afinfo);
2452}
2453
2454static struct pernet_operations udp4_net_ops = {
2455 .init = udp4_proc_init_net,
2456 .exit = udp4_proc_exit_net,
2457};
2458
2459int __init udp4_proc_init(void)
2460{
2461 return register_pernet_subsys(&udp4_net_ops);
2462}
2463
2464void udp4_proc_exit(void)
2465{
2466 unregister_pernet_subsys(&udp4_net_ops);
2467}
2468#endif
2469
2470static __initdata unsigned long uhash_entries;
2471static int __init set_uhash_entries(char *str)
2472{
2473 ssize_t ret;
2474
2475 if (!str)
2476 return 0;
2477
2478 ret = kstrtoul(str, 0, &uhash_entries);
2479 if (ret)
2480 return 0;
2481
2482 if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN)
2483 uhash_entries = UDP_HTABLE_SIZE_MIN;
2484 return 1;
2485}
2486__setup("uhash_entries=", set_uhash_entries);
2487
2488void __init udp_table_init(struct udp_table *table, const char *name)
2489{
2490 unsigned int i;
2491
2492 table->hash = alloc_large_system_hash(name,
2493 2 * sizeof(struct udp_hslot),
2494 uhash_entries,
2495 21,
2496 0,
2497 &table->log,
2498 &table->mask,
2499 UDP_HTABLE_SIZE_MIN,
2500 64 * 1024);
2501
2502 table->hash2 = table->hash + (table->mask + 1);
2503 for (i = 0; i <= table->mask; i++) {
2504 INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i);
2505 table->hash[i].count = 0;
2506 spin_lock_init(&table->hash[i].lock);
2507 }
2508 for (i = 0; i <= table->mask; i++) {
2509 INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i);
2510 table->hash2[i].count = 0;
2511 spin_lock_init(&table->hash2[i].lock);
2512 }
2513}
2514
2515void __init udp_init(void)
2516{
2517 unsigned long limit;
2518
2519 udp_table_init(&udp_table, "UDP");
2520 limit = nr_free_buffer_pages() / 8;
2521 limit = max(limit, 128UL);
2522 sysctl_udp_mem[0] = limit / 4 * 3;
2523 sysctl_udp_mem[1] = limit;
2524 sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2;
2525
2526 sysctl_udp_rmem_min = SK_MEM_QUANTUM;
2527 sysctl_udp_wmem_min = SK_MEM_QUANTUM;
2528}
2529
2530struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb,
2531 netdev_features_t features)
2532{
2533 struct sk_buff *segs = ERR_PTR(-EINVAL);
2534 u16 mac_offset = skb->mac_header;
2535 int mac_len = skb->mac_len;
2536 int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb);
2537 __be16 protocol = skb->protocol;
2538 netdev_features_t enc_features;
2539 int udp_offset, outer_hlen;
2540 unsigned int oldlen;
2541 bool need_csum;
2542
2543 oldlen = (u16)~skb->len;
2544
2545 if (unlikely(!pskb_may_pull(skb, tnl_hlen)))
2546 goto out;
2547
2548 skb->encapsulation = 0;
2549 __skb_pull(skb, tnl_hlen);
2550 skb_reset_mac_header(skb);
2551 skb_set_network_header(skb, skb_inner_network_offset(skb));
2552 skb->mac_len = skb_inner_network_offset(skb);
2553 skb->protocol = htons(ETH_P_TEB);
2554
2555 need_csum = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP_TUNNEL_CSUM);
2556 if (need_csum)
2557 skb->encap_hdr_csum = 1;
2558
2559
2560 enc_features = skb->dev->hw_enc_features & netif_skb_features(skb);
2561 segs = skb_mac_gso_segment(skb, enc_features);
2562 if (!segs || IS_ERR(segs)) {
2563 skb_gso_error_unwind(skb, protocol, tnl_hlen, mac_offset,
2564 mac_len);
2565 goto out;
2566 }
2567
2568 outer_hlen = skb_tnl_header_len(skb);
2569 udp_offset = outer_hlen - tnl_hlen;
2570 skb = segs;
2571 do {
2572 struct udphdr *uh;
2573 int len;
2574
2575 skb_reset_inner_headers(skb);
2576 skb->encapsulation = 1;
2577
2578 skb->mac_len = mac_len;
2579
2580 skb_push(skb, outer_hlen);
2581 skb_reset_mac_header(skb);
2582 skb_set_network_header(skb, mac_len);
2583 skb_set_transport_header(skb, udp_offset);
2584 len = skb->len - udp_offset;
2585 uh = udp_hdr(skb);
2586 uh->len = htons(len);
2587
2588 if (need_csum) {
2589 __be32 delta = htonl(oldlen + len);
2590
2591 uh->check = ~csum_fold((__force __wsum)
2592 ((__force u32)uh->check +
2593 (__force u32)delta));
2594 uh->check = gso_make_checksum(skb, ~uh->check);
2595
2596 if (uh->check == 0)
2597 uh->check = CSUM_MANGLED_0;
2598 }
2599
2600 skb->protocol = protocol;
2601 } while ((skb = skb->next));
2602out:
2603 return segs;
2604}
2605