2 * INET An implementation of the TCP/IP protocol suite for the LINUX
3 * operating system. INET is implemented using the BSD Socket
4 * interface as the means of communication with the user level.
6 * The User Datagram Protocol (UDP).
9 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
10 * Arnt Gulbrandsen, <agulbra@nvg.unit.no>
11 * Alan Cox, <Alan.Cox@linux.org>
12 * Hirokazu Takahashi, <taka@valinux.co.jp>
15 * Alan Cox : verify_area() calls
16 * Alan Cox : stopped close while in use off icmp
17 * messages. Not a fix but a botch that
18 * for udp at least is 'valid'.
19 * Alan Cox : Fixed icmp handling properly
20 * Alan Cox : Correct error for oversized datagrams
21 * Alan Cox : Tidied select() semantics.
22 * Alan Cox : udp_err() fixed properly, also now
23 * select and read wake correctly on errors
24 * Alan Cox : udp_send verify_area moved to avoid mem leak
25 * Alan Cox : UDP can count its memory
26 * Alan Cox : send to an unknown connection causes
27 * an ECONNREFUSED off the icmp, but
29 * Alan Cox : Switched to new sk_buff handlers. No more backlog!
30 * Alan Cox : Using generic datagram code. Even smaller and the PEEK
31 * bug no longer crashes it.
32 * Fred Van Kempen : Net2e support for sk->broadcast.
33 * Alan Cox : Uses skb_free_datagram
34 * Alan Cox : Added get/set sockopt support.
35 * Alan Cox : Broadcasting without option set returns EACCES.
36 * Alan Cox : No wakeup calls. Instead we now use the callbacks.
37 * Alan Cox : Use ip_tos and ip_ttl
38 * Alan Cox : SNMP Mibs
39 * Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support.
40 * Matt Dillon : UDP length checks.
41 * Alan Cox : Smarter af_inet used properly.
42 * Alan Cox : Use new kernel side addressing.
43 * Alan Cox : Incorrect return on truncated datagram receive.
44 * Arnt Gulbrandsen : New udp_send and stuff
45 * Alan Cox : Cache last socket
46 * Alan Cox : Route cache
47 * Jon Peatfield : Minor efficiency fix to sendto().
48 * Mike Shaver : RFC1122 checks.
49 * Alan Cox : Nonblocking error fix.
50 * Willy Konynenberg : Transparent proxying support.
51 * Mike McLagan : Routing by source
52 * David S. Miller : New socket lookup architecture.
53 * Last socket cache retained as it
54 * does have a high hit rate.
55 * Olaf Kirch : Don't linearise iovec on sendmsg.
56 * Andi Kleen : Some cleanups, cache destination entry
58 * Vitaly E. Lavrov : Transparent proxy revived after year coma.
59 * Melvin Smith : Check msg_name not msg_namelen in sendto(),
60 * return ENOTCONN for unconnected sockets (POSIX)
61 * Janos Farkas : don't deliver multi/broadcasts to a different
62 * bound-to-device socket
63 * Hirokazu Takahashi : HW checksumming for outgoing UDP
65 * Hirokazu Takahashi : sendfile() on UDP works now.
66 * Arnaldo C. Melo : convert /proc/net/udp to seq_file
67 * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
68 * Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind
69 * a single port at the same time.
70 * Derek Atkins <derek@ihtfp.com>: Add Encapulation Support
71 * James Chapman : Add L2TP encapsulation type.
74 * This program is free software; you can redistribute it and/or
75 * modify it under the terms of the GNU General Public License
76 * as published by the Free Software Foundation; either version
77 * 2 of the License, or (at your option) any later version.
80 #include <asm/system.h>
81 #include <asm/uaccess.h>
82 #include <asm/ioctls.h>
83 #include <linux/bootmem.h>
84 #include <linux/types.h>
85 #include <linux/fcntl.h>
86 #include <linux/module.h>
87 #include <linux/socket.h>
88 #include <linux/sockios.h>
89 #include <linux/igmp.h>
91 #include <linux/errno.h>
92 #include <linux/timer.h>
94 #include <linux/inet.h>
95 #include <linux/netdevice.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/route.h>
103 #include <net/checksum.h>
104 #include <net/xfrm.h>
105 #include "udp_impl.h"
108 * Snmp MIB for the UDP layer
111 DEFINE_SNMP_STAT(struct udp_mib
, udp_stats_in6
) __read_mostly
;
112 EXPORT_SYMBOL(udp_stats_in6
);
114 struct hlist_head udp_hash
[UDP_HTABLE_SIZE
];
115 DEFINE_RWLOCK(udp_hash_lock
);
117 int sysctl_udp_mem
[3] __read_mostly
;
118 int sysctl_udp_rmem_min __read_mostly
;
119 int sysctl_udp_wmem_min __read_mostly
;
121 EXPORT_SYMBOL(sysctl_udp_mem
);
122 EXPORT_SYMBOL(sysctl_udp_rmem_min
);
123 EXPORT_SYMBOL(sysctl_udp_wmem_min
);
125 atomic_t udp_memory_allocated
;
126 EXPORT_SYMBOL(udp_memory_allocated
);
128 static inline int __udp_lib_lport_inuse(struct net
*net
, __u16 num
,
129 const struct hlist_head udptable
[])
132 struct hlist_node
*node
;
134 sk_for_each(sk
, node
, &udptable
[udp_hashfn(net
, num
)])
135 if (net_eq(sock_net(sk
), net
) && sk
->sk_hash
== num
)
141 * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6
143 * @sk: socket struct in question
144 * @snum: port number to look up
145 * @saddr_comp: AF-dependent comparison of bound local IP addresses
147 int udp_lib_get_port(struct sock
*sk
, unsigned short snum
,
148 int (*saddr_comp
)(const struct sock
*sk1
,
149 const struct sock
*sk2
) )
151 struct hlist_head
*udptable
= sk
->sk_prot
->h
.udp_hash
;
152 struct hlist_node
*node
;
153 struct hlist_head
*head
;
156 struct net
*net
= sock_net(sk
);
158 write_lock_bh(&udp_hash_lock
);
161 int i
, low
, high
, remaining
;
162 unsigned rover
, best
, best_size_so_far
;
164 inet_get_local_port_range(&low
, &high
);
165 remaining
= (high
- low
) + 1;
167 best_size_so_far
= UINT_MAX
;
168 best
= rover
= net_random() % remaining
+ low
;
170 /* 1st pass: look for empty (or shortest) hash chain */
171 for (i
= 0; i
< UDP_HTABLE_SIZE
; i
++) {
174 head
= &udptable
[udp_hashfn(net
, rover
)];
175 if (hlist_empty(head
))
178 sk_for_each(sk2
, node
, head
) {
179 if (++size
>= best_size_so_far
)
182 best_size_so_far
= size
;
185 /* fold back if end of range */
187 rover
= low
+ ((rover
- low
)
188 & (UDP_HTABLE_SIZE
- 1));
193 /* 2nd pass: find hole in shortest hash chain */
195 for (i
= 0; i
< (1 << 16) / UDP_HTABLE_SIZE
; i
++) {
196 if (! __udp_lib_lport_inuse(net
, rover
, udptable
))
198 rover
+= UDP_HTABLE_SIZE
;
200 rover
= low
+ ((rover
- low
)
201 & (UDP_HTABLE_SIZE
- 1));
205 /* All ports in use! */
211 head
= &udptable
[udp_hashfn(net
, snum
)];
213 sk_for_each(sk2
, node
, head
)
214 if (sk2
->sk_hash
== snum
&&
216 net_eq(sock_net(sk2
), net
) &&
217 (!sk2
->sk_reuse
|| !sk
->sk_reuse
) &&
218 (!sk2
->sk_bound_dev_if
|| !sk
->sk_bound_dev_if
219 || sk2
->sk_bound_dev_if
== sk
->sk_bound_dev_if
) &&
220 (*saddr_comp
)(sk
, sk2
) )
224 inet_sk(sk
)->num
= snum
;
226 if (sk_unhashed(sk
)) {
227 head
= &udptable
[udp_hashfn(net
, snum
)];
228 sk_add_node(sk
, head
);
229 sock_prot_inuse_add(sock_net(sk
), sk
->sk_prot
, 1);
233 write_unlock_bh(&udp_hash_lock
);
237 static int ipv4_rcv_saddr_equal(const struct sock
*sk1
, const struct sock
*sk2
)
239 struct inet_sock
*inet1
= inet_sk(sk1
), *inet2
= inet_sk(sk2
);
241 return ( !ipv6_only_sock(sk2
) &&
242 (!inet1
->rcv_saddr
|| !inet2
->rcv_saddr
||
243 inet1
->rcv_saddr
== inet2
->rcv_saddr
));
246 int udp_v4_get_port(struct sock
*sk
, unsigned short snum
)
248 return udp_lib_get_port(sk
, snum
, ipv4_rcv_saddr_equal
);
251 /* UDP is nearly always wildcards out the wazoo, it makes no sense to try
252 * harder than this. -DaveM
254 static struct sock
*__udp4_lib_lookup(struct net
*net
, __be32 saddr
,
255 __be16 sport
, __be32 daddr
, __be16 dport
,
256 int dif
, struct hlist_head udptable
[])
258 struct sock
*sk
, *result
= NULL
;
259 struct hlist_node
*node
;
260 unsigned short hnum
= ntohs(dport
);
263 read_lock(&udp_hash_lock
);
264 sk_for_each(sk
, node
, &udptable
[udp_hashfn(net
, hnum
)]) {
265 struct inet_sock
*inet
= inet_sk(sk
);
267 if (net_eq(sock_net(sk
), net
) && sk
->sk_hash
== hnum
&&
268 !ipv6_only_sock(sk
)) {
269 int score
= (sk
->sk_family
== PF_INET
? 1 : 0);
270 if (inet
->rcv_saddr
) {
271 if (inet
->rcv_saddr
!= daddr
)
276 if (inet
->daddr
!= saddr
)
281 if (inet
->dport
!= sport
)
285 if (sk
->sk_bound_dev_if
) {
286 if (sk
->sk_bound_dev_if
!= dif
)
293 } else if (score
> badness
) {
301 read_unlock(&udp_hash_lock
);
305 static inline struct sock
*udp_v4_mcast_next(struct net
*net
, struct sock
*sk
,
306 __be16 loc_port
, __be32 loc_addr
,
307 __be16 rmt_port
, __be32 rmt_addr
,
310 struct hlist_node
*node
;
312 unsigned short hnum
= ntohs(loc_port
);
314 sk_for_each_from(s
, node
) {
315 struct inet_sock
*inet
= inet_sk(s
);
317 if (!net_eq(sock_net(s
), net
) ||
318 s
->sk_hash
!= hnum
||
319 (inet
->daddr
&& inet
->daddr
!= rmt_addr
) ||
320 (inet
->dport
!= rmt_port
&& inet
->dport
) ||
321 (inet
->rcv_saddr
&& inet
->rcv_saddr
!= loc_addr
) ||
323 (s
->sk_bound_dev_if
&& s
->sk_bound_dev_if
!= dif
))
325 if (!ip_mc_sf_allow(s
, loc_addr
, rmt_addr
, dif
))
335 * This routine is called by the ICMP module when it gets some
336 * sort of error condition. If err < 0 then the socket should
337 * be closed and the error returned to the user. If err > 0
338 * it's just the icmp type << 8 | icmp code.
339 * Header points to the ip header of the error packet. We move
340 * on past this. Then (as it used to claim before adjustment)
341 * header points to the first 8 bytes of the udp header. We need
342 * to find the appropriate port.
345 void __udp4_lib_err(struct sk_buff
*skb
, u32 info
, struct hlist_head udptable
[])
347 struct inet_sock
*inet
;
348 struct iphdr
*iph
= (struct iphdr
*)skb
->data
;
349 struct udphdr
*uh
= (struct udphdr
*)(skb
->data
+(iph
->ihl
<<2));
350 const int type
= icmp_hdr(skb
)->type
;
351 const int code
= icmp_hdr(skb
)->code
;
355 struct net
*net
= dev_net(skb
->dev
);
357 sk
= __udp4_lib_lookup(net
, iph
->daddr
, uh
->dest
,
358 iph
->saddr
, uh
->source
, skb
->dev
->ifindex
, udptable
);
360 ICMP_INC_STATS_BH(net
, ICMP_MIB_INERRORS
);
361 return; /* No socket for error */
370 case ICMP_TIME_EXCEEDED
:
373 case ICMP_SOURCE_QUENCH
:
375 case ICMP_PARAMETERPROB
:
379 case ICMP_DEST_UNREACH
:
380 if (code
== ICMP_FRAG_NEEDED
) { /* Path MTU discovery */
381 if (inet
->pmtudisc
!= IP_PMTUDISC_DONT
) {
389 if (code
<= NR_ICMP_UNREACH
) {
390 harderr
= icmp_err_convert
[code
].fatal
;
391 err
= icmp_err_convert
[code
].errno
;
397 * RFC1122: OK. Passes ICMP errors back to application, as per
400 if (!inet
->recverr
) {
401 if (!harderr
|| sk
->sk_state
!= TCP_ESTABLISHED
)
404 ip_icmp_error(sk
, skb
, err
, uh
->dest
, info
, (u8
*)(uh
+1));
407 sk
->sk_error_report(sk
);
412 void udp_err(struct sk_buff
*skb
, u32 info
)
414 __udp4_lib_err(skb
, info
, udp_hash
);
418 * Throw away all pending data and cancel the corking. Socket is locked.
420 void udp_flush_pending_frames(struct sock
*sk
)
422 struct udp_sock
*up
= udp_sk(sk
);
427 ip_flush_pending_frames(sk
);
430 EXPORT_SYMBOL(udp_flush_pending_frames
);
433 * udp4_hwcsum_outgoing - handle outgoing HW checksumming
434 * @sk: socket we are sending on
435 * @skb: sk_buff containing the filled-in UDP header
436 * (checksum field must be zeroed out)
438 static void udp4_hwcsum_outgoing(struct sock
*sk
, struct sk_buff
*skb
,
439 __be32 src
, __be32 dst
, int len
)
442 struct udphdr
*uh
= udp_hdr(skb
);
445 if (skb_queue_len(&sk
->sk_write_queue
) == 1) {
447 * Only one fragment on the socket.
449 skb
->csum_start
= skb_transport_header(skb
) - skb
->head
;
450 skb
->csum_offset
= offsetof(struct udphdr
, check
);
451 uh
->check
= ~csum_tcpudp_magic(src
, dst
, len
, IPPROTO_UDP
, 0);
454 * HW-checksum won't work as there are two or more
455 * fragments on the socket so that all csums of sk_buffs
458 offset
= skb_transport_offset(skb
);
459 skb
->csum
= skb_checksum(skb
, offset
, skb
->len
- offset
, 0);
461 skb
->ip_summed
= CHECKSUM_NONE
;
463 skb_queue_walk(&sk
->sk_write_queue
, skb
) {
464 csum
= csum_add(csum
, skb
->csum
);
467 uh
->check
= csum_tcpudp_magic(src
, dst
, len
, IPPROTO_UDP
, csum
);
469 uh
->check
= CSUM_MANGLED_0
;
474 * Push out all pending data as one UDP datagram. Socket is locked.
476 static int udp_push_pending_frames(struct sock
*sk
)
478 struct udp_sock
*up
= udp_sk(sk
);
479 struct inet_sock
*inet
= inet_sk(sk
);
480 struct flowi
*fl
= &inet
->cork
.fl
;
484 int is_udplite
= IS_UDPLITE(sk
);
487 /* Grab the skbuff where UDP header space exists. */
488 if ((skb
= skb_peek(&sk
->sk_write_queue
)) == NULL
)
492 * Create a UDP header
495 uh
->source
= fl
->fl_ip_sport
;
496 uh
->dest
= fl
->fl_ip_dport
;
497 uh
->len
= htons(up
->len
);
500 if (is_udplite
) /* UDP-Lite */
501 csum
= udplite_csum_outgoing(sk
, skb
);
503 else if (sk
->sk_no_check
== UDP_CSUM_NOXMIT
) { /* UDP csum disabled */
505 skb
->ip_summed
= CHECKSUM_NONE
;
508 } else if (skb
->ip_summed
== CHECKSUM_PARTIAL
) { /* UDP hardware csum */
510 udp4_hwcsum_outgoing(sk
, skb
, fl
->fl4_src
,fl
->fl4_dst
, up
->len
);
513 } else /* `normal' UDP */
514 csum
= udp_csum_outgoing(sk
, skb
);
516 /* add protocol-dependent pseudo-header */
517 uh
->check
= csum_tcpudp_magic(fl
->fl4_src
, fl
->fl4_dst
, up
->len
,
518 sk
->sk_protocol
, csum
);
520 uh
->check
= CSUM_MANGLED_0
;
523 err
= ip_push_pending_frames(sk
);
528 UDP_INC_STATS_USER(sock_net(sk
),
529 UDP_MIB_OUTDATAGRAMS
, is_udplite
);
533 int udp_sendmsg(struct kiocb
*iocb
, struct sock
*sk
, struct msghdr
*msg
,
536 struct inet_sock
*inet
= inet_sk(sk
);
537 struct udp_sock
*up
= udp_sk(sk
);
539 struct ipcm_cookie ipc
;
540 struct rtable
*rt
= NULL
;
543 __be32 daddr
, faddr
, saddr
;
546 int err
, is_udplite
= IS_UDPLITE(sk
);
547 int corkreq
= up
->corkflag
|| msg
->msg_flags
&MSG_MORE
;
548 int (*getfrag
)(void *, char *, int, int, int, struct sk_buff
*);
557 if (msg
->msg_flags
&MSG_OOB
) /* Mirror BSD error message compatibility */
564 * There are pending frames.
565 * The socket lock must be held while it's corked.
568 if (likely(up
->pending
)) {
569 if (unlikely(up
->pending
!= AF_INET
)) {
577 ulen
+= sizeof(struct udphdr
);
580 * Get and verify the address.
583 struct sockaddr_in
* usin
= (struct sockaddr_in
*)msg
->msg_name
;
584 if (msg
->msg_namelen
< sizeof(*usin
))
586 if (usin
->sin_family
!= AF_INET
) {
587 if (usin
->sin_family
!= AF_UNSPEC
)
588 return -EAFNOSUPPORT
;
591 daddr
= usin
->sin_addr
.s_addr
;
592 dport
= usin
->sin_port
;
596 if (sk
->sk_state
!= TCP_ESTABLISHED
)
597 return -EDESTADDRREQ
;
600 /* Open fast path for connected socket.
601 Route will not be used, if at least one option is set.
605 ipc
.addr
= inet
->saddr
;
607 ipc
.oif
= sk
->sk_bound_dev_if
;
608 if (msg
->msg_controllen
) {
609 err
= ip_cmsg_send(sock_net(sk
), msg
, &ipc
);
620 ipc
.addr
= faddr
= daddr
;
622 if (ipc
.opt
&& ipc
.opt
->srr
) {
625 faddr
= ipc
.opt
->faddr
;
628 tos
= RT_TOS(inet
->tos
);
629 if (sock_flag(sk
, SOCK_LOCALROUTE
) ||
630 (msg
->msg_flags
& MSG_DONTROUTE
) ||
631 (ipc
.opt
&& ipc
.opt
->is_strictroute
)) {
636 if (ipv4_is_multicast(daddr
)) {
638 ipc
.oif
= inet
->mc_index
;
640 saddr
= inet
->mc_addr
;
645 rt
= (struct rtable
*)sk_dst_check(sk
, 0);
648 struct flowi fl
= { .oif
= ipc
.oif
,
653 .proto
= sk
->sk_protocol
,
655 { .sport
= inet
->sport
,
656 .dport
= dport
} } };
657 struct net
*net
= sock_net(sk
);
659 security_sk_classify_flow(sk
, &fl
);
660 err
= ip_route_output_flow(net
, &rt
, &fl
, sk
, 1);
662 if (err
== -ENETUNREACH
)
663 IP_INC_STATS_BH(net
, IPSTATS_MIB_OUTNOROUTES
);
668 if ((rt
->rt_flags
& RTCF_BROADCAST
) &&
669 !sock_flag(sk
, SOCK_BROADCAST
))
672 sk_dst_set(sk
, dst_clone(&rt
->u
.dst
));
675 if (msg
->msg_flags
&MSG_CONFIRM
)
681 daddr
= ipc
.addr
= rt
->rt_dst
;
684 if (unlikely(up
->pending
)) {
685 /* The socket is already corked while preparing it. */
686 /* ... which is an evident application bug. --ANK */
689 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 2\n");
694 * Now cork the socket to pend data.
696 inet
->cork
.fl
.fl4_dst
= daddr
;
697 inet
->cork
.fl
.fl_ip_dport
= dport
;
698 inet
->cork
.fl
.fl4_src
= saddr
;
699 inet
->cork
.fl
.fl_ip_sport
= inet
->sport
;
700 up
->pending
= AF_INET
;
704 getfrag
= is_udplite
? udplite_getfrag
: ip_generic_getfrag
;
705 err
= ip_append_data(sk
, getfrag
, msg
->msg_iov
, ulen
,
706 sizeof(struct udphdr
), &ipc
, rt
,
707 corkreq
? msg
->msg_flags
|MSG_MORE
: msg
->msg_flags
);
709 udp_flush_pending_frames(sk
);
711 err
= udp_push_pending_frames(sk
);
712 else if (unlikely(skb_queue_empty(&sk
->sk_write_queue
)))
723 * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
724 * ENOBUFS might not be good (it's not tunable per se), but otherwise
725 * we don't have a good statistic (IpOutDiscards but it can be too many
726 * things). We could add another new stat but at least for now that
727 * seems like overkill.
729 if (err
== -ENOBUFS
|| test_bit(SOCK_NOSPACE
, &sk
->sk_socket
->flags
)) {
730 UDP_INC_STATS_USER(sock_net(sk
),
731 UDP_MIB_SNDBUFERRORS
, is_udplite
);
736 dst_confirm(&rt
->u
.dst
);
737 if (!(msg
->msg_flags
&MSG_PROBE
) || len
)
738 goto back_from_confirm
;
743 int udp_sendpage(struct sock
*sk
, struct page
*page
, int offset
,
744 size_t size
, int flags
)
746 struct udp_sock
*up
= udp_sk(sk
);
750 struct msghdr msg
= { .msg_flags
= flags
|MSG_MORE
};
752 /* Call udp_sendmsg to specify destination address which
753 * sendpage interface can't pass.
754 * This will succeed only when the socket is connected.
756 ret
= udp_sendmsg(NULL
, sk
, &msg
, 0);
763 if (unlikely(!up
->pending
)) {
766 LIMIT_NETDEBUG(KERN_DEBUG
"udp cork app bug 3\n");
770 ret
= ip_append_page(sk
, page
, offset
, size
, flags
);
771 if (ret
== -EOPNOTSUPP
) {
773 return sock_no_sendpage(sk
->sk_socket
, page
, offset
,
777 udp_flush_pending_frames(sk
);
782 if (!(up
->corkflag
|| (flags
&MSG_MORE
)))
783 ret
= udp_push_pending_frames(sk
);
792 * IOCTL requests applicable to the UDP protocol
795 int udp_ioctl(struct sock
*sk
, int cmd
, unsigned long arg
)
800 int amount
= atomic_read(&sk
->sk_wmem_alloc
);
801 return put_user(amount
, (int __user
*)arg
);
807 unsigned long amount
;
810 spin_lock_bh(&sk
->sk_receive_queue
.lock
);
811 skb
= skb_peek(&sk
->sk_receive_queue
);
814 * We will only return the amount
815 * of this packet since that is all
818 amount
= skb
->len
- sizeof(struct udphdr
);
820 spin_unlock_bh(&sk
->sk_receive_queue
.lock
);
821 return put_user(amount
, (int __user
*)arg
);
832 * This should be easy, if there is something there we
833 * return it, otherwise we block.
836 int udp_recvmsg(struct kiocb
*iocb
, struct sock
*sk
, struct msghdr
*msg
,
837 size_t len
, int noblock
, int flags
, int *addr_len
)
839 struct inet_sock
*inet
= inet_sk(sk
);
840 struct sockaddr_in
*sin
= (struct sockaddr_in
*)msg
->msg_name
;
842 unsigned int ulen
, copied
;
845 int is_udplite
= IS_UDPLITE(sk
);
848 * Check any passed addresses
851 *addr_len
=sizeof(*sin
);
853 if (flags
& MSG_ERRQUEUE
)
854 return ip_recv_error(sk
, msg
, len
);
857 skb
= __skb_recv_datagram(sk
, flags
| (noblock
? MSG_DONTWAIT
: 0),
862 ulen
= skb
->len
- sizeof(struct udphdr
);
866 else if (copied
< ulen
)
867 msg
->msg_flags
|= MSG_TRUNC
;
870 * If checksum is needed at all, try to do it while copying the
871 * data. If the data is truncated, or if we only want a partial
872 * coverage checksum (UDP-Lite), do it before the copy.
875 if (copied
< ulen
|| UDP_SKB_CB(skb
)->partial_cov
) {
876 if (udp_lib_checksum_complete(skb
))
880 if (skb_csum_unnecessary(skb
))
881 err
= skb_copy_datagram_iovec(skb
, sizeof(struct udphdr
),
882 msg
->msg_iov
, copied
);
884 err
= skb_copy_and_csum_datagram_iovec(skb
, sizeof(struct udphdr
), msg
->msg_iov
);
894 UDP_INC_STATS_USER(sock_net(sk
),
895 UDP_MIB_INDATAGRAMS
, is_udplite
);
897 sock_recv_timestamp(msg
, sk
, skb
);
899 /* Copy the address. */
902 sin
->sin_family
= AF_INET
;
903 sin
->sin_port
= udp_hdr(skb
)->source
;
904 sin
->sin_addr
.s_addr
= ip_hdr(skb
)->saddr
;
905 memset(sin
->sin_zero
, 0, sizeof(sin
->sin_zero
));
907 if (inet
->cmsg_flags
)
908 ip_cmsg_recv(msg
, skb
);
911 if (flags
& MSG_TRUNC
)
916 skb_free_datagram(sk
, skb
);
923 if (!skb_kill_datagram(sk
, skb
, flags
))
924 UDP_INC_STATS_USER(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
933 int udp_disconnect(struct sock
*sk
, int flags
)
935 struct inet_sock
*inet
= inet_sk(sk
);
937 * 1003.1g - break association.
940 sk
->sk_state
= TCP_CLOSE
;
943 sk
->sk_bound_dev_if
= 0;
944 if (!(sk
->sk_userlocks
& SOCK_BINDADDR_LOCK
))
945 inet_reset_saddr(sk
);
947 if (!(sk
->sk_userlocks
& SOCK_BINDPORT_LOCK
)) {
948 sk
->sk_prot
->unhash(sk
);
955 static int __udp_queue_rcv_skb(struct sock
*sk
, struct sk_buff
*skb
)
957 int is_udplite
= IS_UDPLITE(sk
);
960 if ((rc
= sock_queue_rcv_skb(sk
, skb
)) < 0) {
961 /* Note that an ENOMEM error is charged twice */
963 UDP_INC_STATS_BH(sock_net(sk
), UDP_MIB_RCVBUFERRORS
,
971 UDP_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
979 * >0: "udp encap" protocol resubmission
981 * Note that in the success and error cases, the skb is assumed to
982 * have either been requeued or freed.
984 int udp_queue_rcv_skb(struct sock
* sk
, struct sk_buff
*skb
)
986 struct udp_sock
*up
= udp_sk(sk
);
988 int is_udplite
= IS_UDPLITE(sk
);
991 * Charge it to the socket, dropping if the queue is full.
993 if (!xfrm4_policy_check(sk
, XFRM_POLICY_IN
, skb
))
997 if (up
->encap_type
) {
999 * This is an encapsulation socket so pass the skb to
1000 * the socket's udp_encap_rcv() hook. Otherwise, just
1001 * fall through and pass this up the UDP socket.
1002 * up->encap_rcv() returns the following value:
1003 * =0 if skb was successfully passed to the encap
1004 * handler or was discarded by it.
1005 * >0 if skb should be passed on to UDP.
1006 * <0 if skb should be resubmitted as proto -N
1009 /* if we're overly short, let UDP handle it */
1010 if (skb
->len
> sizeof(struct udphdr
) &&
1011 up
->encap_rcv
!= NULL
) {
1014 ret
= (*up
->encap_rcv
)(sk
, skb
);
1016 UDP_INC_STATS_BH(sock_net(sk
),
1017 UDP_MIB_INDATAGRAMS
,
1023 /* FALLTHROUGH -- it's a UDP Packet */
1027 * UDP-Lite specific tests, ignored on UDP sockets
1029 if ((is_udplite
& UDPLITE_RECV_CC
) && UDP_SKB_CB(skb
)->partial_cov
) {
1032 * MIB statistics other than incrementing the error count are
1033 * disabled for the following two types of errors: these depend
1034 * on the application settings, not on the functioning of the
1035 * protocol stack as such.
1037 * RFC 3828 here recommends (sec 3.3): "There should also be a
1038 * way ... to ... at least let the receiving application block
1039 * delivery of packets with coverage values less than a value
1040 * provided by the application."
1042 if (up
->pcrlen
== 0) { /* full coverage was set */
1043 LIMIT_NETDEBUG(KERN_WARNING
"UDPLITE: partial coverage "
1044 "%d while full coverage %d requested\n",
1045 UDP_SKB_CB(skb
)->cscov
, skb
->len
);
1048 /* The next case involves violating the min. coverage requested
1049 * by the receiver. This is subtle: if receiver wants x and x is
1050 * greater than the buffersize/MTU then receiver will complain
1051 * that it wants x while sender emits packets of smaller size y.
1052 * Therefore the above ...()->partial_cov statement is essential.
1054 if (UDP_SKB_CB(skb
)->cscov
< up
->pcrlen
) {
1055 LIMIT_NETDEBUG(KERN_WARNING
1056 "UDPLITE: coverage %d too small, need min %d\n",
1057 UDP_SKB_CB(skb
)->cscov
, up
->pcrlen
);
1062 if (sk
->sk_filter
) {
1063 if (udp_lib_checksum_complete(skb
))
1070 if (!sock_owned_by_user(sk
))
1071 rc
= __udp_queue_rcv_skb(sk
, skb
);
1073 sk_add_backlog(sk
, skb
);
1079 UDP_INC_STATS_BH(sock_net(sk
), UDP_MIB_INERRORS
, is_udplite
);
1085 * Multicasts and broadcasts go to each listener.
1087 * Note: called only from the BH handler context,
1088 * so we don't need to lock the hashes.
1090 static int __udp4_lib_mcast_deliver(struct net
*net
, struct sk_buff
*skb
,
1092 __be32 saddr
, __be32 daddr
,
1093 struct hlist_head udptable
[])
1098 read_lock(&udp_hash_lock
);
1099 sk
= sk_head(&udptable
[udp_hashfn(net
, ntohs(uh
->dest
))]);
1100 dif
= skb
->dev
->ifindex
;
1101 sk
= udp_v4_mcast_next(net
, sk
, uh
->dest
, daddr
, uh
->source
, saddr
, dif
);
1103 struct sock
*sknext
= NULL
;
1106 struct sk_buff
*skb1
= skb
;
1108 sknext
= udp_v4_mcast_next(net
, sk_next(sk
), uh
->dest
,
1109 daddr
, uh
->source
, saddr
,
1112 skb1
= skb_clone(skb
, GFP_ATOMIC
);
1115 int ret
= udp_queue_rcv_skb(sk
, skb1
);
1117 /* we should probably re-process instead
1118 * of dropping packets here. */
1125 read_unlock(&udp_hash_lock
);
1129 /* Initialize UDP checksum. If exited with zero value (success),
1130 * CHECKSUM_UNNECESSARY means, that no more checks are required.
1131 * Otherwise, csum completion requires chacksumming packet body,
1132 * including udp header and folding it to skb->csum.
1134 static inline int udp4_csum_init(struct sk_buff
*skb
, struct udphdr
*uh
,
1137 const struct iphdr
*iph
;
1140 UDP_SKB_CB(skb
)->partial_cov
= 0;
1141 UDP_SKB_CB(skb
)->cscov
= skb
->len
;
1143 if (proto
== IPPROTO_UDPLITE
) {
1144 err
= udplite_checksum_init(skb
, uh
);
1150 if (uh
->check
== 0) {
1151 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1152 } else if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
1153 if (!csum_tcpudp_magic(iph
->saddr
, iph
->daddr
, skb
->len
,
1155 skb
->ip_summed
= CHECKSUM_UNNECESSARY
;
1157 if (!skb_csum_unnecessary(skb
))
1158 skb
->csum
= csum_tcpudp_nofold(iph
->saddr
, iph
->daddr
,
1159 skb
->len
, proto
, 0);
1160 /* Probably, we should checksum udp header (it should be in cache
1161 * in any case) and data in tiny packets (< rx copybreak).
1168 * All we need to do is get the socket, and then do a checksum.
1171 int __udp4_lib_rcv(struct sk_buff
*skb
, struct hlist_head udptable
[],
1175 struct udphdr
*uh
= udp_hdr(skb
);
1176 unsigned short ulen
;
1177 struct rtable
*rt
= (struct rtable
*)skb
->dst
;
1178 __be32 saddr
= ip_hdr(skb
)->saddr
;
1179 __be32 daddr
= ip_hdr(skb
)->daddr
;
1180 struct net
*net
= dev_net(skb
->dev
);
1183 * Validate the packet.
1185 if (!pskb_may_pull(skb
, sizeof(struct udphdr
)))
1186 goto drop
; /* No space for header. */
1188 ulen
= ntohs(uh
->len
);
1189 if (ulen
> skb
->len
)
1192 if (proto
== IPPROTO_UDP
) {
1193 /* UDP validates ulen. */
1194 if (ulen
< sizeof(*uh
) || pskb_trim_rcsum(skb
, ulen
))
1199 if (udp4_csum_init(skb
, uh
, proto
))
1202 if (rt
->rt_flags
& (RTCF_BROADCAST
|RTCF_MULTICAST
))
1203 return __udp4_lib_mcast_deliver(net
, skb
, uh
,
1204 saddr
, daddr
, udptable
);
1206 sk
= __udp4_lib_lookup(net
, saddr
, uh
->source
, daddr
,
1207 uh
->dest
, inet_iif(skb
), udptable
);
1210 int ret
= udp_queue_rcv_skb(sk
, skb
);
1213 /* a return value > 0 means to resubmit the input, but
1214 * it wants the return to be -protocol, or 0
1221 if (!xfrm4_policy_check(NULL
, XFRM_POLICY_IN
, skb
))
1225 /* No socket. Drop packet silently, if checksum is wrong */
1226 if (udp_lib_checksum_complete(skb
))
1229 UDP_INC_STATS_BH(net
, UDP_MIB_NOPORTS
, proto
== IPPROTO_UDPLITE
);
1230 icmp_send(skb
, ICMP_DEST_UNREACH
, ICMP_PORT_UNREACH
, 0);
1233 * Hmm. We got an UDP packet to a port to which we
1234 * don't wanna listen. Ignore it.
1240 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%s: short packet: From " NIPQUAD_FMT
":%u %d/%d to " NIPQUAD_FMT
":%u\n",
1241 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
1252 * RFC1122: OK. Discards the bad packet silently (as far as
1253 * the network is concerned, anyway) as per 4.1.3.4 (MUST).
1255 LIMIT_NETDEBUG(KERN_DEBUG
"UDP%s: bad checksum. From " NIPQUAD_FMT
":%u to " NIPQUAD_FMT
":%u ulen %d\n",
1256 proto
== IPPROTO_UDPLITE
? "-Lite" : "",
1263 UDP_INC_STATS_BH(net
, UDP_MIB_INERRORS
, proto
== IPPROTO_UDPLITE
);
1268 int udp_rcv(struct sk_buff
*skb
)
1270 return __udp4_lib_rcv(skb
, udp_hash
, IPPROTO_UDP
);
1273 void udp_destroy_sock(struct sock
*sk
)
1276 udp_flush_pending_frames(sk
);
1281 * Socket option code for UDP
1283 int udp_lib_setsockopt(struct sock
*sk
, int level
, int optname
,
1284 char __user
*optval
, int optlen
,
1285 int (*push_pending_frames
)(struct sock
*))
1287 struct udp_sock
*up
= udp_sk(sk
);
1290 int is_udplite
= IS_UDPLITE(sk
);
1292 if (optlen
<sizeof(int))
1295 if (get_user(val
, (int __user
*)optval
))
1305 (*push_pending_frames
)(sk
);
1313 case UDP_ENCAP_ESPINUDP
:
1314 case UDP_ENCAP_ESPINUDP_NON_IKE
:
1315 up
->encap_rcv
= xfrm4_udp_encap_rcv
;
1317 case UDP_ENCAP_L2TPINUDP
:
1318 up
->encap_type
= val
;
1327 * UDP-Lite's partial checksum coverage (RFC 3828).
1329 /* The sender sets actual checksum coverage length via this option.
1330 * The case coverage > packet length is handled by send module. */
1331 case UDPLITE_SEND_CSCOV
:
1332 if (!is_udplite
) /* Disable the option on UDP sockets */
1333 return -ENOPROTOOPT
;
1334 if (val
!= 0 && val
< 8) /* Illegal coverage: use default (8) */
1336 else if (val
> USHORT_MAX
)
1339 up
->pcflag
|= UDPLITE_SEND_CC
;
1342 /* The receiver specifies a minimum checksum coverage value. To make
1343 * sense, this should be set to at least 8 (as done below). If zero is
1344 * used, this again means full checksum coverage. */
1345 case UDPLITE_RECV_CSCOV
:
1346 if (!is_udplite
) /* Disable the option on UDP sockets */
1347 return -ENOPROTOOPT
;
1348 if (val
!= 0 && val
< 8) /* Avoid silly minimal values. */
1350 else if (val
> USHORT_MAX
)
1353 up
->pcflag
|= UDPLITE_RECV_CC
;
1364 int udp_setsockopt(struct sock
*sk
, int level
, int optname
,
1365 char __user
*optval
, int optlen
)
1367 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1368 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1369 udp_push_pending_frames
);
1370 return ip_setsockopt(sk
, level
, optname
, optval
, optlen
);
1373 #ifdef CONFIG_COMPAT
1374 int compat_udp_setsockopt(struct sock
*sk
, int level
, int optname
,
1375 char __user
*optval
, int optlen
)
1377 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1378 return udp_lib_setsockopt(sk
, level
, optname
, optval
, optlen
,
1379 udp_push_pending_frames
);
1380 return compat_ip_setsockopt(sk
, level
, optname
, optval
, optlen
);
1384 int udp_lib_getsockopt(struct sock
*sk
, int level
, int optname
,
1385 char __user
*optval
, int __user
*optlen
)
1387 struct udp_sock
*up
= udp_sk(sk
);
1390 if (get_user(len
,optlen
))
1393 len
= min_t(unsigned int, len
, sizeof(int));
1404 val
= up
->encap_type
;
1407 /* The following two cannot be changed on UDP sockets, the return is
1408 * always 0 (which corresponds to the full checksum coverage of UDP). */
1409 case UDPLITE_SEND_CSCOV
:
1413 case UDPLITE_RECV_CSCOV
:
1418 return -ENOPROTOOPT
;
1421 if (put_user(len
, optlen
))
1423 if (copy_to_user(optval
, &val
,len
))
1428 int udp_getsockopt(struct sock
*sk
, int level
, int optname
,
1429 char __user
*optval
, int __user
*optlen
)
1431 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1432 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1433 return ip_getsockopt(sk
, level
, optname
, optval
, optlen
);
1436 #ifdef CONFIG_COMPAT
1437 int compat_udp_getsockopt(struct sock
*sk
, int level
, int optname
,
1438 char __user
*optval
, int __user
*optlen
)
1440 if (level
== SOL_UDP
|| level
== SOL_UDPLITE
)
1441 return udp_lib_getsockopt(sk
, level
, optname
, optval
, optlen
);
1442 return compat_ip_getsockopt(sk
, level
, optname
, optval
, optlen
);
1446 * udp_poll - wait for a UDP event.
1447 * @file - file struct
1449 * @wait - poll table
1451 * This is same as datagram poll, except for the special case of
1452 * blocking sockets. If application is using a blocking fd
1453 * and a packet with checksum error is in the queue;
1454 * then it could get return from select indicating data available
1455 * but then block when reading it. Add special case code
1456 * to work around these arguably broken applications.
1458 unsigned int udp_poll(struct file
*file
, struct socket
*sock
, poll_table
*wait
)
1460 unsigned int mask
= datagram_poll(file
, sock
, wait
);
1461 struct sock
*sk
= sock
->sk
;
1462 int is_lite
= IS_UDPLITE(sk
);
1464 /* Check for false positives due to checksum errors */
1465 if ( (mask
& POLLRDNORM
) &&
1466 !(file
->f_flags
& O_NONBLOCK
) &&
1467 !(sk
->sk_shutdown
& RCV_SHUTDOWN
)){
1468 struct sk_buff_head
*rcvq
= &sk
->sk_receive_queue
;
1469 struct sk_buff
*skb
;
1471 spin_lock_bh(&rcvq
->lock
);
1472 while ((skb
= skb_peek(rcvq
)) != NULL
&&
1473 udp_lib_checksum_complete(skb
)) {
1474 UDP_INC_STATS_BH(sock_net(sk
),
1475 UDP_MIB_INERRORS
, is_lite
);
1476 __skb_unlink(skb
, rcvq
);
1479 spin_unlock_bh(&rcvq
->lock
);
1481 /* nothing to see, move along */
1483 mask
&= ~(POLLIN
| POLLRDNORM
);
1490 struct proto udp_prot
= {
1492 .owner
= THIS_MODULE
,
1493 .close
= udp_lib_close
,
1494 .connect
= ip4_datagram_connect
,
1495 .disconnect
= udp_disconnect
,
1497 .destroy
= udp_destroy_sock
,
1498 .setsockopt
= udp_setsockopt
,
1499 .getsockopt
= udp_getsockopt
,
1500 .sendmsg
= udp_sendmsg
,
1501 .recvmsg
= udp_recvmsg
,
1502 .sendpage
= udp_sendpage
,
1503 .backlog_rcv
= __udp_queue_rcv_skb
,
1504 .hash
= udp_lib_hash
,
1505 .unhash
= udp_lib_unhash
,
1506 .get_port
= udp_v4_get_port
,
1507 .memory_allocated
= &udp_memory_allocated
,
1508 .sysctl_mem
= sysctl_udp_mem
,
1509 .sysctl_wmem
= &sysctl_udp_wmem_min
,
1510 .sysctl_rmem
= &sysctl_udp_rmem_min
,
1511 .obj_size
= sizeof(struct udp_sock
),
1512 .h
.udp_hash
= udp_hash
,
1513 #ifdef CONFIG_COMPAT
1514 .compat_setsockopt
= compat_udp_setsockopt
,
1515 .compat_getsockopt
= compat_udp_getsockopt
,
1519 /* ------------------------------------------------------------------------ */
1520 #ifdef CONFIG_PROC_FS
1522 static struct sock
*udp_get_first(struct seq_file
*seq
)
1525 struct udp_iter_state
*state
= seq
->private;
1526 struct net
*net
= seq_file_net(seq
);
1528 for (state
->bucket
= 0; state
->bucket
< UDP_HTABLE_SIZE
; ++state
->bucket
) {
1529 struct hlist_node
*node
;
1530 sk_for_each(sk
, node
, state
->hashtable
+ state
->bucket
) {
1531 if (!net_eq(sock_net(sk
), net
))
1533 if (sk
->sk_family
== state
->family
)
1542 static struct sock
*udp_get_next(struct seq_file
*seq
, struct sock
*sk
)
1544 struct udp_iter_state
*state
= seq
->private;
1545 struct net
*net
= seq_file_net(seq
);
1551 } while (sk
&& (!net_eq(sock_net(sk
), net
) || sk
->sk_family
!= state
->family
));
1553 if (!sk
&& ++state
->bucket
< UDP_HTABLE_SIZE
) {
1554 sk
= sk_head(state
->hashtable
+ state
->bucket
);
1560 static struct sock
*udp_get_idx(struct seq_file
*seq
, loff_t pos
)
1562 struct sock
*sk
= udp_get_first(seq
);
1565 while (pos
&& (sk
= udp_get_next(seq
, sk
)) != NULL
)
1567 return pos
? NULL
: sk
;
1570 static void *udp_seq_start(struct seq_file
*seq
, loff_t
*pos
)
1571 __acquires(udp_hash_lock
)
1573 read_lock(&udp_hash_lock
);
1574 return *pos
? udp_get_idx(seq
, *pos
-1) : SEQ_START_TOKEN
;
1577 static void *udp_seq_next(struct seq_file
*seq
, void *v
, loff_t
*pos
)
1581 if (v
== SEQ_START_TOKEN
)
1582 sk
= udp_get_idx(seq
, 0);
1584 sk
= udp_get_next(seq
, v
);
1590 static void udp_seq_stop(struct seq_file
*seq
, void *v
)
1591 __releases(udp_hash_lock
)
1593 read_unlock(&udp_hash_lock
);
1596 static int udp_seq_open(struct inode
*inode
, struct file
*file
)
1598 struct udp_seq_afinfo
*afinfo
= PDE(inode
)->data
;
1599 struct udp_iter_state
*s
;
1602 err
= seq_open_net(inode
, file
, &afinfo
->seq_ops
,
1603 sizeof(struct udp_iter_state
));
1607 s
= ((struct seq_file
*)file
->private_data
)->private;
1608 s
->family
= afinfo
->family
;
1609 s
->hashtable
= afinfo
->hashtable
;
1613 /* ------------------------------------------------------------------------ */
1614 int udp_proc_register(struct net
*net
, struct udp_seq_afinfo
*afinfo
)
1616 struct proc_dir_entry
*p
;
1619 afinfo
->seq_fops
.open
= udp_seq_open
;
1620 afinfo
->seq_fops
.read
= seq_read
;
1621 afinfo
->seq_fops
.llseek
= seq_lseek
;
1622 afinfo
->seq_fops
.release
= seq_release_net
;
1624 afinfo
->seq_ops
.start
= udp_seq_start
;
1625 afinfo
->seq_ops
.next
= udp_seq_next
;
1626 afinfo
->seq_ops
.stop
= udp_seq_stop
;
1628 p
= proc_create_data(afinfo
->name
, S_IRUGO
, net
->proc_net
,
1629 &afinfo
->seq_fops
, afinfo
);
1635 void udp_proc_unregister(struct net
*net
, struct udp_seq_afinfo
*afinfo
)
1637 proc_net_remove(net
, afinfo
->name
);
1640 /* ------------------------------------------------------------------------ */
1641 static void udp4_format_sock(struct sock
*sp
, struct seq_file
*f
,
1642 int bucket
, int *len
)
1644 struct inet_sock
*inet
= inet_sk(sp
);
1645 __be32 dest
= inet
->daddr
;
1646 __be32 src
= inet
->rcv_saddr
;
1647 __u16 destp
= ntohs(inet
->dport
);
1648 __u16 srcp
= ntohs(inet
->sport
);
1650 seq_printf(f
, "%4d: %08X:%04X %08X:%04X"
1651 " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d%n",
1652 bucket
, src
, srcp
, dest
, destp
, sp
->sk_state
,
1653 atomic_read(&sp
->sk_wmem_alloc
),
1654 atomic_read(&sp
->sk_rmem_alloc
),
1655 0, 0L, 0, sock_i_uid(sp
), 0, sock_i_ino(sp
),
1656 atomic_read(&sp
->sk_refcnt
), sp
,
1657 atomic_read(&sp
->sk_drops
), len
);
1660 int udp4_seq_show(struct seq_file
*seq
, void *v
)
1662 if (v
== SEQ_START_TOKEN
)
1663 seq_printf(seq
, "%-127s\n",
1664 " sl local_address rem_address st tx_queue "
1665 "rx_queue tr tm->when retrnsmt uid timeout "
1666 "inode ref pointer drops");
1668 struct udp_iter_state
*state
= seq
->private;
1671 udp4_format_sock(v
, seq
, state
->bucket
, &len
);
1672 seq_printf(seq
, "%*s\n", 127 - len
,"");
1677 /* ------------------------------------------------------------------------ */
1678 static struct udp_seq_afinfo udp4_seq_afinfo
= {
1681 .hashtable
= udp_hash
,
1683 .owner
= THIS_MODULE
,
1686 .show
= udp4_seq_show
,
1690 static int udp4_proc_init_net(struct net
*net
)
1692 return udp_proc_register(net
, &udp4_seq_afinfo
);
1695 static void udp4_proc_exit_net(struct net
*net
)
1697 udp_proc_unregister(net
, &udp4_seq_afinfo
);
1700 static struct pernet_operations udp4_net_ops
= {
1701 .init
= udp4_proc_init_net
,
1702 .exit
= udp4_proc_exit_net
,
1705 int __init
udp4_proc_init(void)
1707 return register_pernet_subsys(&udp4_net_ops
);
1710 void udp4_proc_exit(void)
1712 unregister_pernet_subsys(&udp4_net_ops
);
1714 #endif /* CONFIG_PROC_FS */
1716 void __init
udp_init(void)
1718 unsigned long limit
;
1720 /* Set the pressure threshold up by the same strategy of TCP. It is a
1721 * fraction of global memory that is up to 1/2 at 256 MB, decreasing
1722 * toward zero with the amount of memory, with a floor of 128 pages.
1724 limit
= min(nr_all_pages
, 1UL<<(28-PAGE_SHIFT
)) >> (20-PAGE_SHIFT
);
1725 limit
= (limit
* (nr_all_pages
>> (20-PAGE_SHIFT
))) >> (PAGE_SHIFT
-11);
1726 limit
= max(limit
, 128UL);
1727 sysctl_udp_mem
[0] = limit
/ 4 * 3;
1728 sysctl_udp_mem
[1] = limit
;
1729 sysctl_udp_mem
[2] = sysctl_udp_mem
[0] * 2;
1731 sysctl_udp_rmem_min
= SK_MEM_QUANTUM
;
1732 sysctl_udp_wmem_min
= SK_MEM_QUANTUM
;
1735 EXPORT_SYMBOL(udp_disconnect
);
1736 EXPORT_SYMBOL(udp_hash
);
1737 EXPORT_SYMBOL(udp_hash_lock
);
1738 EXPORT_SYMBOL(udp_ioctl
);
1739 EXPORT_SYMBOL(udp_prot
);
1740 EXPORT_SYMBOL(udp_sendmsg
);
1741 EXPORT_SYMBOL(udp_lib_getsockopt
);
1742 EXPORT_SYMBOL(udp_lib_setsockopt
);
1743 EXPORT_SYMBOL(udp_poll
);
1744 EXPORT_SYMBOL(udp_lib_get_port
);
1746 #ifdef CONFIG_PROC_FS
1747 EXPORT_SYMBOL(udp_proc_register
);
1748 EXPORT_SYMBOL(udp_proc_unregister
);