udp.c (9e9fd65d1fa51d919d54d731be0e66492b5b6c5a) udp.c (55be7a9c6074f749d617a7fc1914c9a23505438c)
1/*
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.
5 *
6 * The User Datagram Protocol (UDP).
7 *
8 * Authors: Ross Biro

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103#include <linux/seq_file.h>
104#include <net/net_namespace.h>
105#include <net/icmp.h>
106#include <net/route.h>
107#include <net/checksum.h>
108#include <net/xfrm.h>
109#include <trace/events/udp.h>
110#include <linux/static_key.h>
1/*
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.
5 *
6 * The User Datagram Protocol (UDP).
7 *
8 * Authors: Ross Biro

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103#include <linux/seq_file.h>
104#include <net/net_namespace.h>
105#include <net/icmp.h>
106#include <net/route.h>
107#include <net/checksum.h>
108#include <net/xfrm.h>
109#include <trace/events/udp.h>
110#include <linux/static_key.h>
111#include <trace/events/skb.h>
111#include "udp_impl.h"
112
113struct udp_table udp_table __read_mostly;
114EXPORT_SYMBOL(udp_table);
115
116long sysctl_udp_mem[3] __read_mostly;
117EXPORT_SYMBOL(sysctl_udp_mem);
118

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610 case ICMP_SOURCE_QUENCH:
611 goto out;
612 case ICMP_PARAMETERPROB:
613 err = EPROTO;
614 harderr = 1;
615 break;
616 case ICMP_DEST_UNREACH:
617 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
112#include "udp_impl.h"
113
114struct udp_table udp_table __read_mostly;
115EXPORT_SYMBOL(udp_table);
116
117long sysctl_udp_mem[3] __read_mostly;
118EXPORT_SYMBOL(sysctl_udp_mem);
119

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611 case ICMP_SOURCE_QUENCH:
612 goto out;
613 case ICMP_PARAMETERPROB:
614 err = EPROTO;
615 harderr = 1;
616 break;
617 case ICMP_DEST_UNREACH:
618 if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
619 ipv4_sk_update_pmtu(skb, sk, info);
618 if (inet->pmtudisc != IP_PMTUDISC_DONT) {
619 err = EMSGSIZE;
620 harderr = 1;
621 break;
622 }
623 goto out;
624 }
625 err = EHOSTUNREACH;
626 if (code <= NR_ICMP_UNREACH) {
627 harderr = icmp_err_convert[code].fatal;
628 err = icmp_err_convert[code].errno;
629 }
630 break;
620 if (inet->pmtudisc != IP_PMTUDISC_DONT) {
621 err = EMSGSIZE;
622 harderr = 1;
623 break;
624 }
625 goto out;
626 }
627 err = EHOSTUNREACH;
628 if (code <= NR_ICMP_UNREACH) {
629 harderr = icmp_err_convert[code].fatal;
630 err = icmp_err_convert[code].errno;
631 }
632 break;
633 case ICMP_REDIRECT:
634 ipv4_sk_redirect(skb, sk);
635 break;
631 }
632
633 /*
634 * RFC1122: OK. Passes ICMP errors back to application, as per
635 * 4.1.3.3.
636 */
637 if (!inet->recverr) {
638 if (!harderr || sk->sk_state != TCP_ESTABLISHED)

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1214 err = skb_copy_and_csum_datagram_iovec(skb,
1215 sizeof(struct udphdr),
1216 msg->msg_iov);
1217
1218 if (err == -EINVAL)
1219 goto csum_copy_err;
1220 }
1221
636 }
637
638 /*
639 * RFC1122: OK. Passes ICMP errors back to application, as per
640 * 4.1.3.3.
641 */
642 if (!inet->recverr) {
643 if (!harderr || sk->sk_state != TCP_ESTABLISHED)

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1219 err = skb_copy_and_csum_datagram_iovec(skb,
1220 sizeof(struct udphdr),
1221 msg->msg_iov);
1222
1223 if (err == -EINVAL)
1224 goto csum_copy_err;
1225 }
1226
1222 if (err)
1227 if (unlikely(err)) {
1228 trace_kfree_skb(skb, udp_recvmsg);
1223 goto out_free;
1229 goto out_free;
1230 }
1224
1225 if (!peeked)
1226 UDP_INC_STATS_USER(sock_net(sk),
1227 UDP_MIB_INDATAGRAMS, is_udplite);
1228
1229 sock_recv_ts_and_drops(msg, sk, skb);
1230
1231 /* Copy the address. */

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1232 if (!peeked)
1233 UDP_INC_STATS_USER(sock_net(sk),
1234 UDP_MIB_INDATAGRAMS, is_udplite);
1235
1236 sock_recv_ts_and_drops(msg, sk, skb);
1237
1238 /* Copy the address. */

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