forked from Minki/linux
6026e043d0
Three cases of simple overlapping changes. Signed-off-by: David S. Miller <davem@davemloft.net>
2856 lines
72 KiB
C
2856 lines
72 KiB
C
/*
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* INET An implementation of the TCP/IP protocol suite for the LINUX
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* operating system. INET is implemented using the BSD Socket
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* interface as the means of communication with the user level.
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*
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* The User Datagram Protocol (UDP).
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*
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* Authors: Ross Biro
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* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
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* Arnt Gulbrandsen, <agulbra@nvg.unit.no>
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* Alan Cox, <alan@lxorguk.ukuu.org.uk>
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* Hirokazu Takahashi, <taka@valinux.co.jp>
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*
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* Fixes:
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* Alan Cox : verify_area() calls
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* Alan Cox : stopped close while in use off icmp
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* messages. Not a fix but a botch that
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* for udp at least is 'valid'.
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* Alan Cox : Fixed icmp handling properly
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* Alan Cox : Correct error for oversized datagrams
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* Alan Cox : Tidied select() semantics.
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* Alan Cox : udp_err() fixed properly, also now
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* select and read wake correctly on errors
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* Alan Cox : udp_send verify_area moved to avoid mem leak
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* Alan Cox : UDP can count its memory
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* Alan Cox : send to an unknown connection causes
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* an ECONNREFUSED off the icmp, but
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* does NOT close.
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* Alan Cox : Switched to new sk_buff handlers. No more backlog!
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* Alan Cox : Using generic datagram code. Even smaller and the PEEK
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* bug no longer crashes it.
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* Fred Van Kempen : Net2e support for sk->broadcast.
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* Alan Cox : Uses skb_free_datagram
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* Alan Cox : Added get/set sockopt support.
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* Alan Cox : Broadcasting without option set returns EACCES.
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* Alan Cox : No wakeup calls. Instead we now use the callbacks.
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* Alan Cox : Use ip_tos and ip_ttl
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* Alan Cox : SNMP Mibs
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* Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support.
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* Matt Dillon : UDP length checks.
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* Alan Cox : Smarter af_inet used properly.
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* Alan Cox : Use new kernel side addressing.
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* Alan Cox : Incorrect return on truncated datagram receive.
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* Arnt Gulbrandsen : New udp_send and stuff
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* Alan Cox : Cache last socket
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* Alan Cox : Route cache
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* Jon Peatfield : Minor efficiency fix to sendto().
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* Mike Shaver : RFC1122 checks.
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* Alan Cox : Nonblocking error fix.
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* Willy Konynenberg : Transparent proxying support.
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* Mike McLagan : Routing by source
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* David S. Miller : New socket lookup architecture.
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* Last socket cache retained as it
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* does have a high hit rate.
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* Olaf Kirch : Don't linearise iovec on sendmsg.
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* Andi Kleen : Some cleanups, cache destination entry
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* for connect.
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* Vitaly E. Lavrov : Transparent proxy revived after year coma.
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* Melvin Smith : Check msg_name not msg_namelen in sendto(),
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* return ENOTCONN for unconnected sockets (POSIX)
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* Janos Farkas : don't deliver multi/broadcasts to a different
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* bound-to-device socket
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* Hirokazu Takahashi : HW checksumming for outgoing UDP
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* datagrams.
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* Hirokazu Takahashi : sendfile() on UDP works now.
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* Arnaldo C. Melo : convert /proc/net/udp to seq_file
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* YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which
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* Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind
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* a single port at the same time.
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* Derek Atkins <derek@ihtfp.com>: Add Encapulation Support
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* James Chapman : Add L2TP encapsulation type.
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*
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "UDP: " fmt
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#include <linux/uaccess.h>
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#include <asm/ioctls.h>
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#include <linux/bootmem.h>
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#include <linux/highmem.h>
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#include <linux/swap.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/module.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/igmp.h>
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#include <linux/inetdevice.h>
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#include <linux/in.h>
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#include <linux/errno.h>
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#include <linux/timer.h>
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#include <linux/mm.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/slab.h>
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#include <net/tcp_states.h>
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#include <linux/skbuff.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <net/net_namespace.h>
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#include <net/icmp.h>
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#include <net/inet_hashtables.h>
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#include <net/route.h>
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#include <net/checksum.h>
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#include <net/xfrm.h>
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#include <trace/events/udp.h>
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#include <linux/static_key.h>
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#include <trace/events/skb.h>
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#include <net/busy_poll.h>
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#include "udp_impl.h"
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#include <net/sock_reuseport.h>
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#include <net/addrconf.h>
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struct udp_table udp_table __read_mostly;
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EXPORT_SYMBOL(udp_table);
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long sysctl_udp_mem[3] __read_mostly;
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EXPORT_SYMBOL(sysctl_udp_mem);
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int sysctl_udp_rmem_min __read_mostly;
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EXPORT_SYMBOL(sysctl_udp_rmem_min);
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int sysctl_udp_wmem_min __read_mostly;
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EXPORT_SYMBOL(sysctl_udp_wmem_min);
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atomic_long_t udp_memory_allocated;
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EXPORT_SYMBOL(udp_memory_allocated);
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#define MAX_UDP_PORTS 65536
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#define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN)
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/* IPCB reference means this can not be used from early demux */
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static bool udp_lib_exact_dif_match(struct net *net, struct sk_buff *skb)
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{
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#if IS_ENABLED(CONFIG_NET_L3_MASTER_DEV)
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if (!net->ipv4.sysctl_udp_l3mdev_accept &&
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skb && ipv4_l3mdev_skb(IPCB(skb)->flags))
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return true;
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#endif
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return false;
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}
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static int udp_lib_lport_inuse(struct net *net, __u16 num,
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const struct udp_hslot *hslot,
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unsigned long *bitmap,
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struct sock *sk, unsigned int log)
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{
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struct sock *sk2;
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kuid_t uid = sock_i_uid(sk);
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sk_for_each(sk2, &hslot->head) {
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if (net_eq(sock_net(sk2), net) &&
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sk2 != sk &&
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(bitmap || udp_sk(sk2)->udp_port_hash == num) &&
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(!sk2->sk_reuse || !sk->sk_reuse) &&
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(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
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sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
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inet_rcv_saddr_equal(sk, sk2, true)) {
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if (sk2->sk_reuseport && sk->sk_reuseport &&
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!rcu_access_pointer(sk->sk_reuseport_cb) &&
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uid_eq(uid, sock_i_uid(sk2))) {
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if (!bitmap)
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return 0;
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} else {
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if (!bitmap)
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return 1;
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__set_bit(udp_sk(sk2)->udp_port_hash >> log,
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bitmap);
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}
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}
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}
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return 0;
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}
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/*
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* Note: we still hold spinlock of primary hash chain, so no other writer
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* can insert/delete a socket with local_port == num
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*/
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static int udp_lib_lport_inuse2(struct net *net, __u16 num,
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struct udp_hslot *hslot2,
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struct sock *sk)
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{
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struct sock *sk2;
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kuid_t uid = sock_i_uid(sk);
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int res = 0;
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spin_lock(&hslot2->lock);
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udp_portaddr_for_each_entry(sk2, &hslot2->head) {
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if (net_eq(sock_net(sk2), net) &&
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sk2 != sk &&
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(udp_sk(sk2)->udp_port_hash == num) &&
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(!sk2->sk_reuse || !sk->sk_reuse) &&
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(!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if ||
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sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
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inet_rcv_saddr_equal(sk, sk2, true)) {
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if (sk2->sk_reuseport && sk->sk_reuseport &&
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!rcu_access_pointer(sk->sk_reuseport_cb) &&
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uid_eq(uid, sock_i_uid(sk2))) {
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res = 0;
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} else {
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res = 1;
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}
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break;
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}
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}
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spin_unlock(&hslot2->lock);
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return res;
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}
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static int udp_reuseport_add_sock(struct sock *sk, struct udp_hslot *hslot)
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{
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struct net *net = sock_net(sk);
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kuid_t uid = sock_i_uid(sk);
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struct sock *sk2;
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sk_for_each(sk2, &hslot->head) {
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if (net_eq(sock_net(sk2), net) &&
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sk2 != sk &&
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sk2->sk_family == sk->sk_family &&
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ipv6_only_sock(sk2) == ipv6_only_sock(sk) &&
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(udp_sk(sk2)->udp_port_hash == udp_sk(sk)->udp_port_hash) &&
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(sk2->sk_bound_dev_if == sk->sk_bound_dev_if) &&
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sk2->sk_reuseport && uid_eq(uid, sock_i_uid(sk2)) &&
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inet_rcv_saddr_equal(sk, sk2, false)) {
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return reuseport_add_sock(sk, sk2);
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}
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}
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/* Initial allocation may have already happened via setsockopt */
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if (!rcu_access_pointer(sk->sk_reuseport_cb))
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return reuseport_alloc(sk);
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return 0;
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}
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/**
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* udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6
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*
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* @sk: socket struct in question
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* @snum: port number to look up
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* @hash2_nulladdr: AF-dependent hash value in secondary hash chains,
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* with NULL address
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*/
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int udp_lib_get_port(struct sock *sk, unsigned short snum,
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unsigned int hash2_nulladdr)
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{
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struct udp_hslot *hslot, *hslot2;
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struct udp_table *udptable = sk->sk_prot->h.udp_table;
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int error = 1;
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struct net *net = sock_net(sk);
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if (!snum) {
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int low, high, remaining;
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unsigned int rand;
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unsigned short first, last;
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DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN);
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inet_get_local_port_range(net, &low, &high);
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remaining = (high - low) + 1;
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rand = prandom_u32();
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first = reciprocal_scale(rand, remaining) + low;
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/*
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* force rand to be an odd multiple of UDP_HTABLE_SIZE
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*/
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rand = (rand | 1) * (udptable->mask + 1);
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last = first + udptable->mask + 1;
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do {
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hslot = udp_hashslot(udptable, net, first);
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bitmap_zero(bitmap, PORTS_PER_CHAIN);
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spin_lock_bh(&hslot->lock);
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udp_lib_lport_inuse(net, snum, hslot, bitmap, sk,
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udptable->log);
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snum = first;
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/*
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* Iterate on all possible values of snum for this hash.
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* Using steps of an odd multiple of UDP_HTABLE_SIZE
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* give us randomization and full range coverage.
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*/
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do {
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if (low <= snum && snum <= high &&
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!test_bit(snum >> udptable->log, bitmap) &&
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!inet_is_local_reserved_port(net, snum))
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goto found;
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snum += rand;
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} while (snum != first);
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spin_unlock_bh(&hslot->lock);
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cond_resched();
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} while (++first != last);
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goto fail;
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} else {
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hslot = udp_hashslot(udptable, net, snum);
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spin_lock_bh(&hslot->lock);
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if (hslot->count > 10) {
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int exist;
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unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum;
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slot2 &= udptable->mask;
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hash2_nulladdr &= udptable->mask;
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|
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hslot2 = udp_hashslot2(udptable, slot2);
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if (hslot->count < hslot2->count)
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goto scan_primary_hash;
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exist = udp_lib_lport_inuse2(net, snum, hslot2, sk);
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if (!exist && (hash2_nulladdr != slot2)) {
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hslot2 = udp_hashslot2(udptable, hash2_nulladdr);
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exist = udp_lib_lport_inuse2(net, snum, hslot2,
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sk);
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}
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if (exist)
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goto fail_unlock;
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else
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goto found;
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}
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scan_primary_hash:
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if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, 0))
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goto fail_unlock;
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}
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found:
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inet_sk(sk)->inet_num = snum;
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udp_sk(sk)->udp_port_hash = snum;
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udp_sk(sk)->udp_portaddr_hash ^= snum;
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if (sk_unhashed(sk)) {
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if (sk->sk_reuseport &&
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udp_reuseport_add_sock(sk, hslot)) {
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inet_sk(sk)->inet_num = 0;
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udp_sk(sk)->udp_port_hash = 0;
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udp_sk(sk)->udp_portaddr_hash ^= snum;
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goto fail_unlock;
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}
|
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|
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sk_add_node_rcu(sk, &hslot->head);
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hslot->count++;
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sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1);
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|
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hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
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spin_lock(&hslot2->lock);
|
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if (IS_ENABLED(CONFIG_IPV6) && sk->sk_reuseport &&
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sk->sk_family == AF_INET6)
|
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hlist_add_tail_rcu(&udp_sk(sk)->udp_portaddr_node,
|
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&hslot2->head);
|
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else
|
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hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
|
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&hslot2->head);
|
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hslot2->count++;
|
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spin_unlock(&hslot2->lock);
|
|
}
|
|
sock_set_flag(sk, SOCK_RCU_FREE);
|
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error = 0;
|
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fail_unlock:
|
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spin_unlock_bh(&hslot->lock);
|
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fail:
|
|
return error;
|
|
}
|
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EXPORT_SYMBOL(udp_lib_get_port);
|
|
|
|
static u32 udp4_portaddr_hash(const struct net *net, __be32 saddr,
|
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unsigned int port)
|
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{
|
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return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port;
|
|
}
|
|
|
|
int udp_v4_get_port(struct sock *sk, unsigned short snum)
|
|
{
|
|
unsigned int hash2_nulladdr =
|
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udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum);
|
|
unsigned int hash2_partial =
|
|
udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0);
|
|
|
|
/* precompute partial secondary hash */
|
|
udp_sk(sk)->udp_portaddr_hash = hash2_partial;
|
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return udp_lib_get_port(sk, snum, hash2_nulladdr);
|
|
}
|
|
|
|
static int compute_score(struct sock *sk, struct net *net,
|
|
__be32 saddr, __be16 sport,
|
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__be32 daddr, unsigned short hnum,
|
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int dif, int sdif, bool exact_dif)
|
|
{
|
|
int score;
|
|
struct inet_sock *inet;
|
|
|
|
if (!net_eq(sock_net(sk), net) ||
|
|
udp_sk(sk)->udp_port_hash != hnum ||
|
|
ipv6_only_sock(sk))
|
|
return -1;
|
|
|
|
score = (sk->sk_family == PF_INET) ? 2 : 1;
|
|
inet = inet_sk(sk);
|
|
|
|
if (inet->inet_rcv_saddr) {
|
|
if (inet->inet_rcv_saddr != daddr)
|
|
return -1;
|
|
score += 4;
|
|
}
|
|
|
|
if (inet->inet_daddr) {
|
|
if (inet->inet_daddr != saddr)
|
|
return -1;
|
|
score += 4;
|
|
}
|
|
|
|
if (inet->inet_dport) {
|
|
if (inet->inet_dport != sport)
|
|
return -1;
|
|
score += 4;
|
|
}
|
|
|
|
if (sk->sk_bound_dev_if || exact_dif) {
|
|
bool dev_match = (sk->sk_bound_dev_if == dif ||
|
|
sk->sk_bound_dev_if == sdif);
|
|
|
|
if (exact_dif && !dev_match)
|
|
return -1;
|
|
if (sk->sk_bound_dev_if && dev_match)
|
|
score += 4;
|
|
}
|
|
|
|
if (sk->sk_incoming_cpu == raw_smp_processor_id())
|
|
score++;
|
|
return score;
|
|
}
|
|
|
|
static u32 udp_ehashfn(const struct net *net, const __be32 laddr,
|
|
const __u16 lport, const __be32 faddr,
|
|
const __be16 fport)
|
|
{
|
|
static u32 udp_ehash_secret __read_mostly;
|
|
|
|
net_get_random_once(&udp_ehash_secret, sizeof(udp_ehash_secret));
|
|
|
|
return __inet_ehashfn(laddr, lport, faddr, fport,
|
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udp_ehash_secret + net_hash_mix(net));
|
|
}
|
|
|
|
/* called with rcu_read_lock() */
|
|
static struct sock *udp4_lib_lookup2(struct net *net,
|
|
__be32 saddr, __be16 sport,
|
|
__be32 daddr, unsigned int hnum,
|
|
int dif, int sdif, bool exact_dif,
|
|
struct udp_hslot *hslot2,
|
|
struct sk_buff *skb)
|
|
{
|
|
struct sock *sk, *result;
|
|
int score, badness, matches = 0, reuseport = 0;
|
|
u32 hash = 0;
|
|
|
|
result = NULL;
|
|
badness = 0;
|
|
udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
|
|
score = compute_score(sk, net, saddr, sport,
|
|
daddr, hnum, dif, sdif, exact_dif);
|
|
if (score > badness) {
|
|
reuseport = sk->sk_reuseport;
|
|
if (reuseport) {
|
|
hash = udp_ehashfn(net, daddr, hnum,
|
|
saddr, sport);
|
|
result = reuseport_select_sock(sk, hash, skb,
|
|
sizeof(struct udphdr));
|
|
if (result)
|
|
return result;
|
|
matches = 1;
|
|
}
|
|
badness = score;
|
|
result = sk;
|
|
} else if (score == badness && reuseport) {
|
|
matches++;
|
|
if (reciprocal_scale(hash, matches) == 0)
|
|
result = sk;
|
|
hash = next_pseudo_random32(hash);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
|
|
/* UDP is nearly always wildcards out the wazoo, it makes no sense to try
|
|
* harder than this. -DaveM
|
|
*/
|
|
struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr,
|
|
__be16 sport, __be32 daddr, __be16 dport, int dif,
|
|
int sdif, struct udp_table *udptable, struct sk_buff *skb)
|
|
{
|
|
struct sock *sk, *result;
|
|
unsigned short hnum = ntohs(dport);
|
|
unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask);
|
|
struct udp_hslot *hslot2, *hslot = &udptable->hash[slot];
|
|
bool exact_dif = udp_lib_exact_dif_match(net, skb);
|
|
int score, badness, matches = 0, reuseport = 0;
|
|
u32 hash = 0;
|
|
|
|
if (hslot->count > 10) {
|
|
hash2 = udp4_portaddr_hash(net, daddr, hnum);
|
|
slot2 = hash2 & udptable->mask;
|
|
hslot2 = &udptable->hash2[slot2];
|
|
if (hslot->count < hslot2->count)
|
|
goto begin;
|
|
|
|
result = udp4_lib_lookup2(net, saddr, sport,
|
|
daddr, hnum, dif, sdif,
|
|
exact_dif, hslot2, skb);
|
|
if (!result) {
|
|
unsigned int old_slot2 = slot2;
|
|
hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum);
|
|
slot2 = hash2 & udptable->mask;
|
|
/* avoid searching the same slot again. */
|
|
if (unlikely(slot2 == old_slot2))
|
|
return result;
|
|
|
|
hslot2 = &udptable->hash2[slot2];
|
|
if (hslot->count < hslot2->count)
|
|
goto begin;
|
|
|
|
result = udp4_lib_lookup2(net, saddr, sport,
|
|
daddr, hnum, dif, sdif,
|
|
exact_dif, hslot2, skb);
|
|
}
|
|
return result;
|
|
}
|
|
begin:
|
|
result = NULL;
|
|
badness = 0;
|
|
sk_for_each_rcu(sk, &hslot->head) {
|
|
score = compute_score(sk, net, saddr, sport,
|
|
daddr, hnum, dif, sdif, exact_dif);
|
|
if (score > badness) {
|
|
reuseport = sk->sk_reuseport;
|
|
if (reuseport) {
|
|
hash = udp_ehashfn(net, daddr, hnum,
|
|
saddr, sport);
|
|
result = reuseport_select_sock(sk, hash, skb,
|
|
sizeof(struct udphdr));
|
|
if (result)
|
|
return result;
|
|
matches = 1;
|
|
}
|
|
result = sk;
|
|
badness = score;
|
|
} else if (score == badness && reuseport) {
|
|
matches++;
|
|
if (reciprocal_scale(hash, matches) == 0)
|
|
result = sk;
|
|
hash = next_pseudo_random32(hash);
|
|
}
|
|
}
|
|
return result;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__udp4_lib_lookup);
|
|
|
|
static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb,
|
|
__be16 sport, __be16 dport,
|
|
struct udp_table *udptable)
|
|
{
|
|
const struct iphdr *iph = ip_hdr(skb);
|
|
|
|
return __udp4_lib_lookup(dev_net(skb->dev), iph->saddr, sport,
|
|
iph->daddr, dport, inet_iif(skb),
|
|
inet_sdif(skb), udptable, skb);
|
|
}
|
|
|
|
struct sock *udp4_lib_lookup_skb(struct sk_buff *skb,
|
|
__be16 sport, __be16 dport)
|
|
{
|
|
return __udp4_lib_lookup_skb(skb, sport, dport, &udp_table);
|
|
}
|
|
EXPORT_SYMBOL_GPL(udp4_lib_lookup_skb);
|
|
|
|
/* Must be called under rcu_read_lock().
|
|
* Does increment socket refcount.
|
|
*/
|
|
#if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \
|
|
IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \
|
|
IS_ENABLED(CONFIG_NF_SOCKET_IPV4)
|
|
struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport,
|
|
__be32 daddr, __be16 dport, int dif)
|
|
{
|
|
struct sock *sk;
|
|
|
|
sk = __udp4_lib_lookup(net, saddr, sport, daddr, dport,
|
|
dif, 0, &udp_table, NULL);
|
|
if (sk && !refcount_inc_not_zero(&sk->sk_refcnt))
|
|
sk = NULL;
|
|
return sk;
|
|
}
|
|
EXPORT_SYMBOL_GPL(udp4_lib_lookup);
|
|
#endif
|
|
|
|
static inline bool __udp_is_mcast_sock(struct net *net, struct sock *sk,
|
|
__be16 loc_port, __be32 loc_addr,
|
|
__be16 rmt_port, __be32 rmt_addr,
|
|
int dif, int sdif, unsigned short hnum)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
if (!net_eq(sock_net(sk), net) ||
|
|
udp_sk(sk)->udp_port_hash != hnum ||
|
|
(inet->inet_daddr && inet->inet_daddr != rmt_addr) ||
|
|
(inet->inet_dport != rmt_port && inet->inet_dport) ||
|
|
(inet->inet_rcv_saddr && inet->inet_rcv_saddr != loc_addr) ||
|
|
ipv6_only_sock(sk) ||
|
|
(sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif &&
|
|
sk->sk_bound_dev_if != sdif))
|
|
return false;
|
|
if (!ip_mc_sf_allow(sk, loc_addr, rmt_addr, dif, sdif))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* This routine is called by the ICMP module when it gets some
|
|
* sort of error condition. If err < 0 then the socket should
|
|
* be closed and the error returned to the user. If err > 0
|
|
* it's just the icmp type << 8 | icmp code.
|
|
* Header points to the ip header of the error packet. We move
|
|
* on past this. Then (as it used to claim before adjustment)
|
|
* header points to the first 8 bytes of the udp header. We need
|
|
* to find the appropriate port.
|
|
*/
|
|
|
|
void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable)
|
|
{
|
|
struct inet_sock *inet;
|
|
const struct iphdr *iph = (const struct iphdr *)skb->data;
|
|
struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2));
|
|
const int type = icmp_hdr(skb)->type;
|
|
const int code = icmp_hdr(skb)->code;
|
|
struct sock *sk;
|
|
int harderr;
|
|
int err;
|
|
struct net *net = dev_net(skb->dev);
|
|
|
|
sk = __udp4_lib_lookup(net, iph->daddr, uh->dest,
|
|
iph->saddr, uh->source, skb->dev->ifindex, 0,
|
|
udptable, NULL);
|
|
if (!sk) {
|
|
__ICMP_INC_STATS(net, ICMP_MIB_INERRORS);
|
|
return; /* No socket for error */
|
|
}
|
|
|
|
err = 0;
|
|
harderr = 0;
|
|
inet = inet_sk(sk);
|
|
|
|
switch (type) {
|
|
default:
|
|
case ICMP_TIME_EXCEEDED:
|
|
err = EHOSTUNREACH;
|
|
break;
|
|
case ICMP_SOURCE_QUENCH:
|
|
goto out;
|
|
case ICMP_PARAMETERPROB:
|
|
err = EPROTO;
|
|
harderr = 1;
|
|
break;
|
|
case ICMP_DEST_UNREACH:
|
|
if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */
|
|
ipv4_sk_update_pmtu(skb, sk, info);
|
|
if (inet->pmtudisc != IP_PMTUDISC_DONT) {
|
|
err = EMSGSIZE;
|
|
harderr = 1;
|
|
break;
|
|
}
|
|
goto out;
|
|
}
|
|
err = EHOSTUNREACH;
|
|
if (code <= NR_ICMP_UNREACH) {
|
|
harderr = icmp_err_convert[code].fatal;
|
|
err = icmp_err_convert[code].errno;
|
|
}
|
|
break;
|
|
case ICMP_REDIRECT:
|
|
ipv4_sk_redirect(skb, sk);
|
|
goto out;
|
|
}
|
|
|
|
/*
|
|
* RFC1122: OK. Passes ICMP errors back to application, as per
|
|
* 4.1.3.3.
|
|
*/
|
|
if (!inet->recverr) {
|
|
if (!harderr || sk->sk_state != TCP_ESTABLISHED)
|
|
goto out;
|
|
} else
|
|
ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1));
|
|
|
|
sk->sk_err = err;
|
|
sk->sk_error_report(sk);
|
|
out:
|
|
return;
|
|
}
|
|
|
|
void udp_err(struct sk_buff *skb, u32 info)
|
|
{
|
|
__udp4_lib_err(skb, info, &udp_table);
|
|
}
|
|
|
|
/*
|
|
* Throw away all pending data and cancel the corking. Socket is locked.
|
|
*/
|
|
void udp_flush_pending_frames(struct sock *sk)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
|
|
if (up->pending) {
|
|
up->len = 0;
|
|
up->pending = 0;
|
|
ip_flush_pending_frames(sk);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(udp_flush_pending_frames);
|
|
|
|
/**
|
|
* udp4_hwcsum - handle outgoing HW checksumming
|
|
* @skb: sk_buff containing the filled-in UDP header
|
|
* (checksum field must be zeroed out)
|
|
* @src: source IP address
|
|
* @dst: destination IP address
|
|
*/
|
|
void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst)
|
|
{
|
|
struct udphdr *uh = udp_hdr(skb);
|
|
int offset = skb_transport_offset(skb);
|
|
int len = skb->len - offset;
|
|
int hlen = len;
|
|
__wsum csum = 0;
|
|
|
|
if (!skb_has_frag_list(skb)) {
|
|
/*
|
|
* Only one fragment on the socket.
|
|
*/
|
|
skb->csum_start = skb_transport_header(skb) - skb->head;
|
|
skb->csum_offset = offsetof(struct udphdr, check);
|
|
uh->check = ~csum_tcpudp_magic(src, dst, len,
|
|
IPPROTO_UDP, 0);
|
|
} else {
|
|
struct sk_buff *frags;
|
|
|
|
/*
|
|
* HW-checksum won't work as there are two or more
|
|
* fragments on the socket so that all csums of sk_buffs
|
|
* should be together
|
|
*/
|
|
skb_walk_frags(skb, frags) {
|
|
csum = csum_add(csum, frags->csum);
|
|
hlen -= frags->len;
|
|
}
|
|
|
|
csum = skb_checksum(skb, offset, hlen, csum);
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
|
|
uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum);
|
|
if (uh->check == 0)
|
|
uh->check = CSUM_MANGLED_0;
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(udp4_hwcsum);
|
|
|
|
/* Function to set UDP checksum for an IPv4 UDP packet. This is intended
|
|
* for the simple case like when setting the checksum for a UDP tunnel.
|
|
*/
|
|
void udp_set_csum(bool nocheck, struct sk_buff *skb,
|
|
__be32 saddr, __be32 daddr, int len)
|
|
{
|
|
struct udphdr *uh = udp_hdr(skb);
|
|
|
|
if (nocheck) {
|
|
uh->check = 0;
|
|
} else if (skb_is_gso(skb)) {
|
|
uh->check = ~udp_v4_check(len, saddr, daddr, 0);
|
|
} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
uh->check = 0;
|
|
uh->check = udp_v4_check(len, saddr, daddr, lco_csum(skb));
|
|
if (uh->check == 0)
|
|
uh->check = CSUM_MANGLED_0;
|
|
} else {
|
|
skb->ip_summed = CHECKSUM_PARTIAL;
|
|
skb->csum_start = skb_transport_header(skb) - skb->head;
|
|
skb->csum_offset = offsetof(struct udphdr, check);
|
|
uh->check = ~udp_v4_check(len, saddr, daddr, 0);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(udp_set_csum);
|
|
|
|
static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4)
|
|
{
|
|
struct sock *sk = skb->sk;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct udphdr *uh;
|
|
int err = 0;
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
int offset = skb_transport_offset(skb);
|
|
int len = skb->len - offset;
|
|
__wsum csum = 0;
|
|
|
|
/*
|
|
* Create a UDP header
|
|
*/
|
|
uh = udp_hdr(skb);
|
|
uh->source = inet->inet_sport;
|
|
uh->dest = fl4->fl4_dport;
|
|
uh->len = htons(len);
|
|
uh->check = 0;
|
|
|
|
if (is_udplite) /* UDP-Lite */
|
|
csum = udplite_csum(skb);
|
|
|
|
else if (sk->sk_no_check_tx) { /* UDP csum off */
|
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
|
goto send;
|
|
|
|
} else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */
|
|
|
|
udp4_hwcsum(skb, fl4->saddr, fl4->daddr);
|
|
goto send;
|
|
|
|
} else
|
|
csum = udp_csum(skb);
|
|
|
|
/* add protocol-dependent pseudo-header */
|
|
uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len,
|
|
sk->sk_protocol, csum);
|
|
if (uh->check == 0)
|
|
uh->check = CSUM_MANGLED_0;
|
|
|
|
send:
|
|
err = ip_send_skb(sock_net(sk), skb);
|
|
if (err) {
|
|
if (err == -ENOBUFS && !inet->recverr) {
|
|
UDP_INC_STATS(sock_net(sk),
|
|
UDP_MIB_SNDBUFERRORS, is_udplite);
|
|
err = 0;
|
|
}
|
|
} else
|
|
UDP_INC_STATS(sock_net(sk),
|
|
UDP_MIB_OUTDATAGRAMS, is_udplite);
|
|
return err;
|
|
}
|
|
|
|
/*
|
|
* Push out all pending data as one UDP datagram. Socket is locked.
|
|
*/
|
|
int udp_push_pending_frames(struct sock *sk)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct flowi4 *fl4 = &inet->cork.fl.u.ip4;
|
|
struct sk_buff *skb;
|
|
int err = 0;
|
|
|
|
skb = ip_finish_skb(sk, fl4);
|
|
if (!skb)
|
|
goto out;
|
|
|
|
err = udp_send_skb(skb, fl4);
|
|
|
|
out:
|
|
up->len = 0;
|
|
up->pending = 0;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(udp_push_pending_frames);
|
|
|
|
int udp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct udp_sock *up = udp_sk(sk);
|
|
struct flowi4 fl4_stack;
|
|
struct flowi4 *fl4;
|
|
int ulen = len;
|
|
struct ipcm_cookie ipc;
|
|
struct rtable *rt = NULL;
|
|
int free = 0;
|
|
int connected = 0;
|
|
__be32 daddr, faddr, saddr;
|
|
__be16 dport;
|
|
u8 tos;
|
|
int err, is_udplite = IS_UDPLITE(sk);
|
|
int corkreq = up->corkflag || msg->msg_flags&MSG_MORE;
|
|
int (*getfrag)(void *, char *, int, int, int, struct sk_buff *);
|
|
struct sk_buff *skb;
|
|
struct ip_options_data opt_copy;
|
|
|
|
if (len > 0xFFFF)
|
|
return -EMSGSIZE;
|
|
|
|
/*
|
|
* Check the flags.
|
|
*/
|
|
|
|
if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */
|
|
return -EOPNOTSUPP;
|
|
|
|
ipc.opt = NULL;
|
|
ipc.tx_flags = 0;
|
|
ipc.ttl = 0;
|
|
ipc.tos = -1;
|
|
|
|
getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag;
|
|
|
|
fl4 = &inet->cork.fl.u.ip4;
|
|
if (up->pending) {
|
|
/*
|
|
* There are pending frames.
|
|
* The socket lock must be held while it's corked.
|
|
*/
|
|
lock_sock(sk);
|
|
if (likely(up->pending)) {
|
|
if (unlikely(up->pending != AF_INET)) {
|
|
release_sock(sk);
|
|
return -EINVAL;
|
|
}
|
|
goto do_append_data;
|
|
}
|
|
release_sock(sk);
|
|
}
|
|
ulen += sizeof(struct udphdr);
|
|
|
|
/*
|
|
* Get and verify the address.
|
|
*/
|
|
if (msg->msg_name) {
|
|
DECLARE_SOCKADDR(struct sockaddr_in *, usin, msg->msg_name);
|
|
if (msg->msg_namelen < sizeof(*usin))
|
|
return -EINVAL;
|
|
if (usin->sin_family != AF_INET) {
|
|
if (usin->sin_family != AF_UNSPEC)
|
|
return -EAFNOSUPPORT;
|
|
}
|
|
|
|
daddr = usin->sin_addr.s_addr;
|
|
dport = usin->sin_port;
|
|
if (dport == 0)
|
|
return -EINVAL;
|
|
} else {
|
|
if (sk->sk_state != TCP_ESTABLISHED)
|
|
return -EDESTADDRREQ;
|
|
daddr = inet->inet_daddr;
|
|
dport = inet->inet_dport;
|
|
/* Open fast path for connected socket.
|
|
Route will not be used, if at least one option is set.
|
|
*/
|
|
connected = 1;
|
|
}
|
|
|
|
ipc.sockc.tsflags = sk->sk_tsflags;
|
|
ipc.addr = inet->inet_saddr;
|
|
ipc.oif = sk->sk_bound_dev_if;
|
|
|
|
if (msg->msg_controllen) {
|
|
err = ip_cmsg_send(sk, msg, &ipc, sk->sk_family == AF_INET6);
|
|
if (unlikely(err)) {
|
|
kfree(ipc.opt);
|
|
return err;
|
|
}
|
|
if (ipc.opt)
|
|
free = 1;
|
|
connected = 0;
|
|
}
|
|
if (!ipc.opt) {
|
|
struct ip_options_rcu *inet_opt;
|
|
|
|
rcu_read_lock();
|
|
inet_opt = rcu_dereference(inet->inet_opt);
|
|
if (inet_opt) {
|
|
memcpy(&opt_copy, inet_opt,
|
|
sizeof(*inet_opt) + inet_opt->opt.optlen);
|
|
ipc.opt = &opt_copy.opt;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
saddr = ipc.addr;
|
|
ipc.addr = faddr = daddr;
|
|
|
|
sock_tx_timestamp(sk, ipc.sockc.tsflags, &ipc.tx_flags);
|
|
|
|
if (ipc.opt && ipc.opt->opt.srr) {
|
|
if (!daddr)
|
|
return -EINVAL;
|
|
faddr = ipc.opt->opt.faddr;
|
|
connected = 0;
|
|
}
|
|
tos = get_rttos(&ipc, inet);
|
|
if (sock_flag(sk, SOCK_LOCALROUTE) ||
|
|
(msg->msg_flags & MSG_DONTROUTE) ||
|
|
(ipc.opt && ipc.opt->opt.is_strictroute)) {
|
|
tos |= RTO_ONLINK;
|
|
connected = 0;
|
|
}
|
|
|
|
if (ipv4_is_multicast(daddr)) {
|
|
if (!ipc.oif)
|
|
ipc.oif = inet->mc_index;
|
|
if (!saddr)
|
|
saddr = inet->mc_addr;
|
|
connected = 0;
|
|
} else if (!ipc.oif)
|
|
ipc.oif = inet->uc_index;
|
|
|
|
if (connected)
|
|
rt = (struct rtable *)sk_dst_check(sk, 0);
|
|
|
|
if (!rt) {
|
|
struct net *net = sock_net(sk);
|
|
__u8 flow_flags = inet_sk_flowi_flags(sk);
|
|
|
|
fl4 = &fl4_stack;
|
|
|
|
flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos,
|
|
RT_SCOPE_UNIVERSE, sk->sk_protocol,
|
|
flow_flags,
|
|
faddr, saddr, dport, inet->inet_sport,
|
|
sk->sk_uid);
|
|
|
|
security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
|
|
rt = ip_route_output_flow(net, fl4, sk);
|
|
if (IS_ERR(rt)) {
|
|
err = PTR_ERR(rt);
|
|
rt = NULL;
|
|
if (err == -ENETUNREACH)
|
|
IP_INC_STATS(net, IPSTATS_MIB_OUTNOROUTES);
|
|
goto out;
|
|
}
|
|
|
|
err = -EACCES;
|
|
if ((rt->rt_flags & RTCF_BROADCAST) &&
|
|
!sock_flag(sk, SOCK_BROADCAST))
|
|
goto out;
|
|
if (connected)
|
|
sk_dst_set(sk, dst_clone(&rt->dst));
|
|
}
|
|
|
|
if (msg->msg_flags&MSG_CONFIRM)
|
|
goto do_confirm;
|
|
back_from_confirm:
|
|
|
|
saddr = fl4->saddr;
|
|
if (!ipc.addr)
|
|
daddr = ipc.addr = fl4->daddr;
|
|
|
|
/* Lockless fast path for the non-corking case. */
|
|
if (!corkreq) {
|
|
skb = ip_make_skb(sk, fl4, getfrag, msg, ulen,
|
|
sizeof(struct udphdr), &ipc, &rt,
|
|
msg->msg_flags);
|
|
err = PTR_ERR(skb);
|
|
if (!IS_ERR_OR_NULL(skb))
|
|
err = udp_send_skb(skb, fl4);
|
|
goto out;
|
|
}
|
|
|
|
lock_sock(sk);
|
|
if (unlikely(up->pending)) {
|
|
/* The socket is already corked while preparing it. */
|
|
/* ... which is an evident application bug. --ANK */
|
|
release_sock(sk);
|
|
|
|
net_dbg_ratelimited("cork app bug 2\n");
|
|
err = -EINVAL;
|
|
goto out;
|
|
}
|
|
/*
|
|
* Now cork the socket to pend data.
|
|
*/
|
|
fl4 = &inet->cork.fl.u.ip4;
|
|
fl4->daddr = daddr;
|
|
fl4->saddr = saddr;
|
|
fl4->fl4_dport = dport;
|
|
fl4->fl4_sport = inet->inet_sport;
|
|
up->pending = AF_INET;
|
|
|
|
do_append_data:
|
|
up->len += ulen;
|
|
err = ip_append_data(sk, fl4, getfrag, msg, ulen,
|
|
sizeof(struct udphdr), &ipc, &rt,
|
|
corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags);
|
|
if (err)
|
|
udp_flush_pending_frames(sk);
|
|
else if (!corkreq)
|
|
err = udp_push_pending_frames(sk);
|
|
else if (unlikely(skb_queue_empty(&sk->sk_write_queue)))
|
|
up->pending = 0;
|
|
release_sock(sk);
|
|
|
|
out:
|
|
ip_rt_put(rt);
|
|
if (free)
|
|
kfree(ipc.opt);
|
|
if (!err)
|
|
return len;
|
|
/*
|
|
* ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting
|
|
* ENOBUFS might not be good (it's not tunable per se), but otherwise
|
|
* we don't have a good statistic (IpOutDiscards but it can be too many
|
|
* things). We could add another new stat but at least for now that
|
|
* seems like overkill.
|
|
*/
|
|
if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) {
|
|
UDP_INC_STATS(sock_net(sk),
|
|
UDP_MIB_SNDBUFERRORS, is_udplite);
|
|
}
|
|
return err;
|
|
|
|
do_confirm:
|
|
if (msg->msg_flags & MSG_PROBE)
|
|
dst_confirm_neigh(&rt->dst, &fl4->daddr);
|
|
if (!(msg->msg_flags&MSG_PROBE) || len)
|
|
goto back_from_confirm;
|
|
err = 0;
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL(udp_sendmsg);
|
|
|
|
int udp_sendpage(struct sock *sk, struct page *page, int offset,
|
|
size_t size, int flags)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct udp_sock *up = udp_sk(sk);
|
|
int ret;
|
|
|
|
if (flags & MSG_SENDPAGE_NOTLAST)
|
|
flags |= MSG_MORE;
|
|
|
|
if (!up->pending) {
|
|
struct msghdr msg = { .msg_flags = flags|MSG_MORE };
|
|
|
|
/* Call udp_sendmsg to specify destination address which
|
|
* sendpage interface can't pass.
|
|
* This will succeed only when the socket is connected.
|
|
*/
|
|
ret = udp_sendmsg(sk, &msg, 0);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
lock_sock(sk);
|
|
|
|
if (unlikely(!up->pending)) {
|
|
release_sock(sk);
|
|
|
|
net_dbg_ratelimited("udp cork app bug 3\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = ip_append_page(sk, &inet->cork.fl.u.ip4,
|
|
page, offset, size, flags);
|
|
if (ret == -EOPNOTSUPP) {
|
|
release_sock(sk);
|
|
return sock_no_sendpage(sk->sk_socket, page, offset,
|
|
size, flags);
|
|
}
|
|
if (ret < 0) {
|
|
udp_flush_pending_frames(sk);
|
|
goto out;
|
|
}
|
|
|
|
up->len += size;
|
|
if (!(up->corkflag || (flags&MSG_MORE)))
|
|
ret = udp_push_pending_frames(sk);
|
|
if (!ret)
|
|
ret = size;
|
|
out:
|
|
release_sock(sk);
|
|
return ret;
|
|
}
|
|
|
|
#define UDP_SKB_IS_STATELESS 0x80000000
|
|
|
|
static void udp_set_dev_scratch(struct sk_buff *skb)
|
|
{
|
|
struct udp_dev_scratch *scratch = udp_skb_scratch(skb);
|
|
|
|
BUILD_BUG_ON(sizeof(struct udp_dev_scratch) > sizeof(long));
|
|
scratch->_tsize_state = skb->truesize;
|
|
#if BITS_PER_LONG == 64
|
|
scratch->len = skb->len;
|
|
scratch->csum_unnecessary = !!skb_csum_unnecessary(skb);
|
|
scratch->is_linear = !skb_is_nonlinear(skb);
|
|
#endif
|
|
/* all head states execept sp (dst, sk, nf) are always cleared by
|
|
* udp_rcv() and we need to preserve secpath, if present, to eventually
|
|
* process IP_CMSG_PASSSEC at recvmsg() time
|
|
*/
|
|
if (likely(!skb_sec_path(skb)))
|
|
scratch->_tsize_state |= UDP_SKB_IS_STATELESS;
|
|
}
|
|
|
|
static int udp_skb_truesize(struct sk_buff *skb)
|
|
{
|
|
return udp_skb_scratch(skb)->_tsize_state & ~UDP_SKB_IS_STATELESS;
|
|
}
|
|
|
|
static bool udp_skb_has_head_state(struct sk_buff *skb)
|
|
{
|
|
return !(udp_skb_scratch(skb)->_tsize_state & UDP_SKB_IS_STATELESS);
|
|
}
|
|
|
|
/* fully reclaim rmem/fwd memory allocated for skb */
|
|
static void udp_rmem_release(struct sock *sk, int size, int partial,
|
|
bool rx_queue_lock_held)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
struct sk_buff_head *sk_queue;
|
|
int amt;
|
|
|
|
if (likely(partial)) {
|
|
up->forward_deficit += size;
|
|
size = up->forward_deficit;
|
|
if (size < (sk->sk_rcvbuf >> 2) &&
|
|
!skb_queue_empty(&up->reader_queue))
|
|
return;
|
|
} else {
|
|
size += up->forward_deficit;
|
|
}
|
|
up->forward_deficit = 0;
|
|
|
|
/* acquire the sk_receive_queue for fwd allocated memory scheduling,
|
|
* if the called don't held it already
|
|
*/
|
|
sk_queue = &sk->sk_receive_queue;
|
|
if (!rx_queue_lock_held)
|
|
spin_lock(&sk_queue->lock);
|
|
|
|
|
|
sk->sk_forward_alloc += size;
|
|
amt = (sk->sk_forward_alloc - partial) & ~(SK_MEM_QUANTUM - 1);
|
|
sk->sk_forward_alloc -= amt;
|
|
|
|
if (amt)
|
|
__sk_mem_reduce_allocated(sk, amt >> SK_MEM_QUANTUM_SHIFT);
|
|
|
|
atomic_sub(size, &sk->sk_rmem_alloc);
|
|
|
|
/* this can save us from acquiring the rx queue lock on next receive */
|
|
skb_queue_splice_tail_init(sk_queue, &up->reader_queue);
|
|
|
|
if (!rx_queue_lock_held)
|
|
spin_unlock(&sk_queue->lock);
|
|
}
|
|
|
|
/* Note: called with reader_queue.lock held.
|
|
* Instead of using skb->truesize here, find a copy of it in skb->dev_scratch
|
|
* This avoids a cache line miss while receive_queue lock is held.
|
|
* Look at __udp_enqueue_schedule_skb() to find where this copy is done.
|
|
*/
|
|
void udp_skb_destructor(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
prefetch(&skb->data);
|
|
udp_rmem_release(sk, udp_skb_truesize(skb), 1, false);
|
|
}
|
|
EXPORT_SYMBOL(udp_skb_destructor);
|
|
|
|
/* as above, but the caller held the rx queue lock, too */
|
|
static void udp_skb_dtor_locked(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
prefetch(&skb->data);
|
|
udp_rmem_release(sk, udp_skb_truesize(skb), 1, true);
|
|
}
|
|
|
|
/* Idea of busylocks is to let producers grab an extra spinlock
|
|
* to relieve pressure on the receive_queue spinlock shared by consumer.
|
|
* Under flood, this means that only one producer can be in line
|
|
* trying to acquire the receive_queue spinlock.
|
|
* These busylock can be allocated on a per cpu manner, instead of a
|
|
* per socket one (that would consume a cache line per socket)
|
|
*/
|
|
static int udp_busylocks_log __read_mostly;
|
|
static spinlock_t *udp_busylocks __read_mostly;
|
|
|
|
static spinlock_t *busylock_acquire(void *ptr)
|
|
{
|
|
spinlock_t *busy;
|
|
|
|
busy = udp_busylocks + hash_ptr(ptr, udp_busylocks_log);
|
|
spin_lock(busy);
|
|
return busy;
|
|
}
|
|
|
|
static void busylock_release(spinlock_t *busy)
|
|
{
|
|
if (busy)
|
|
spin_unlock(busy);
|
|
}
|
|
|
|
int __udp_enqueue_schedule_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct sk_buff_head *list = &sk->sk_receive_queue;
|
|
int rmem, delta, amt, err = -ENOMEM;
|
|
spinlock_t *busy = NULL;
|
|
int size;
|
|
|
|
/* try to avoid the costly atomic add/sub pair when the receive
|
|
* queue is full; always allow at least a packet
|
|
*/
|
|
rmem = atomic_read(&sk->sk_rmem_alloc);
|
|
if (rmem > sk->sk_rcvbuf)
|
|
goto drop;
|
|
|
|
/* Under mem pressure, it might be helpful to help udp_recvmsg()
|
|
* having linear skbs :
|
|
* - Reduce memory overhead and thus increase receive queue capacity
|
|
* - Less cache line misses at copyout() time
|
|
* - Less work at consume_skb() (less alien page frag freeing)
|
|
*/
|
|
if (rmem > (sk->sk_rcvbuf >> 1)) {
|
|
skb_condense(skb);
|
|
|
|
busy = busylock_acquire(sk);
|
|
}
|
|
size = skb->truesize;
|
|
udp_set_dev_scratch(skb);
|
|
|
|
/* we drop only if the receive buf is full and the receive
|
|
* queue contains some other skb
|
|
*/
|
|
rmem = atomic_add_return(size, &sk->sk_rmem_alloc);
|
|
if (rmem > (size + sk->sk_rcvbuf))
|
|
goto uncharge_drop;
|
|
|
|
spin_lock(&list->lock);
|
|
if (size >= sk->sk_forward_alloc) {
|
|
amt = sk_mem_pages(size);
|
|
delta = amt << SK_MEM_QUANTUM_SHIFT;
|
|
if (!__sk_mem_raise_allocated(sk, delta, amt, SK_MEM_RECV)) {
|
|
err = -ENOBUFS;
|
|
spin_unlock(&list->lock);
|
|
goto uncharge_drop;
|
|
}
|
|
|
|
sk->sk_forward_alloc += delta;
|
|
}
|
|
|
|
sk->sk_forward_alloc -= size;
|
|
|
|
/* no need to setup a destructor, we will explicitly release the
|
|
* forward allocated memory on dequeue
|
|
*/
|
|
sock_skb_set_dropcount(sk, skb);
|
|
|
|
__skb_queue_tail(list, skb);
|
|
spin_unlock(&list->lock);
|
|
|
|
if (!sock_flag(sk, SOCK_DEAD))
|
|
sk->sk_data_ready(sk);
|
|
|
|
busylock_release(busy);
|
|
return 0;
|
|
|
|
uncharge_drop:
|
|
atomic_sub(skb->truesize, &sk->sk_rmem_alloc);
|
|
|
|
drop:
|
|
atomic_inc(&sk->sk_drops);
|
|
busylock_release(busy);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__udp_enqueue_schedule_skb);
|
|
|
|
void udp_destruct_sock(struct sock *sk)
|
|
{
|
|
/* reclaim completely the forward allocated memory */
|
|
struct udp_sock *up = udp_sk(sk);
|
|
unsigned int total = 0;
|
|
struct sk_buff *skb;
|
|
|
|
skb_queue_splice_tail_init(&sk->sk_receive_queue, &up->reader_queue);
|
|
while ((skb = __skb_dequeue(&up->reader_queue)) != NULL) {
|
|
total += skb->truesize;
|
|
kfree_skb(skb);
|
|
}
|
|
udp_rmem_release(sk, total, 0, true);
|
|
|
|
inet_sock_destruct(sk);
|
|
}
|
|
EXPORT_SYMBOL_GPL(udp_destruct_sock);
|
|
|
|
int udp_init_sock(struct sock *sk)
|
|
{
|
|
skb_queue_head_init(&udp_sk(sk)->reader_queue);
|
|
sk->sk_destruct = udp_destruct_sock;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(udp_init_sock);
|
|
|
|
void skb_consume_udp(struct sock *sk, struct sk_buff *skb, int len)
|
|
{
|
|
if (unlikely(READ_ONCE(sk->sk_peek_off) >= 0)) {
|
|
bool slow = lock_sock_fast(sk);
|
|
|
|
sk_peek_offset_bwd(sk, len);
|
|
unlock_sock_fast(sk, slow);
|
|
}
|
|
|
|
/* In the more common cases we cleared the head states previously,
|
|
* see __udp_queue_rcv_skb().
|
|
*/
|
|
if (unlikely(udp_skb_has_head_state(skb)))
|
|
skb_release_head_state(skb);
|
|
consume_stateless_skb(skb);
|
|
}
|
|
EXPORT_SYMBOL_GPL(skb_consume_udp);
|
|
|
|
static struct sk_buff *__first_packet_length(struct sock *sk,
|
|
struct sk_buff_head *rcvq,
|
|
int *total)
|
|
{
|
|
struct sk_buff *skb;
|
|
|
|
while ((skb = skb_peek(rcvq)) != NULL) {
|
|
if (udp_lib_checksum_complete(skb)) {
|
|
__UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS,
|
|
IS_UDPLITE(sk));
|
|
__UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS,
|
|
IS_UDPLITE(sk));
|
|
atomic_inc(&sk->sk_drops);
|
|
__skb_unlink(skb, rcvq);
|
|
*total += skb->truesize;
|
|
kfree_skb(skb);
|
|
} else {
|
|
/* the csum related bits could be changed, refresh
|
|
* the scratch area
|
|
*/
|
|
udp_set_dev_scratch(skb);
|
|
break;
|
|
}
|
|
}
|
|
return skb;
|
|
}
|
|
|
|
/**
|
|
* first_packet_length - return length of first packet in receive queue
|
|
* @sk: socket
|
|
*
|
|
* Drops all bad checksum frames, until a valid one is found.
|
|
* Returns the length of found skb, or -1 if none is found.
|
|
*/
|
|
static int first_packet_length(struct sock *sk)
|
|
{
|
|
struct sk_buff_head *rcvq = &udp_sk(sk)->reader_queue;
|
|
struct sk_buff_head *sk_queue = &sk->sk_receive_queue;
|
|
struct sk_buff *skb;
|
|
int total = 0;
|
|
int res;
|
|
|
|
spin_lock_bh(&rcvq->lock);
|
|
skb = __first_packet_length(sk, rcvq, &total);
|
|
if (!skb && !skb_queue_empty(sk_queue)) {
|
|
spin_lock(&sk_queue->lock);
|
|
skb_queue_splice_tail_init(sk_queue, rcvq);
|
|
spin_unlock(&sk_queue->lock);
|
|
|
|
skb = __first_packet_length(sk, rcvq, &total);
|
|
}
|
|
res = skb ? skb->len : -1;
|
|
if (total)
|
|
udp_rmem_release(sk, total, 1, false);
|
|
spin_unlock_bh(&rcvq->lock);
|
|
return res;
|
|
}
|
|
|
|
/*
|
|
* IOCTL requests applicable to the UDP protocol
|
|
*/
|
|
|
|
int udp_ioctl(struct sock *sk, int cmd, unsigned long arg)
|
|
{
|
|
switch (cmd) {
|
|
case SIOCOUTQ:
|
|
{
|
|
int amount = sk_wmem_alloc_get(sk);
|
|
|
|
return put_user(amount, (int __user *)arg);
|
|
}
|
|
|
|
case SIOCINQ:
|
|
{
|
|
int amount = max_t(int, 0, first_packet_length(sk));
|
|
|
|
return put_user(amount, (int __user *)arg);
|
|
}
|
|
|
|
default:
|
|
return -ENOIOCTLCMD;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(udp_ioctl);
|
|
|
|
struct sk_buff *__skb_recv_udp(struct sock *sk, unsigned int flags,
|
|
int noblock, int *peeked, int *off, int *err)
|
|
{
|
|
struct sk_buff_head *sk_queue = &sk->sk_receive_queue;
|
|
struct sk_buff_head *queue;
|
|
struct sk_buff *last;
|
|
long timeo;
|
|
int error;
|
|
|
|
queue = &udp_sk(sk)->reader_queue;
|
|
flags |= noblock ? MSG_DONTWAIT : 0;
|
|
timeo = sock_rcvtimeo(sk, flags & MSG_DONTWAIT);
|
|
do {
|
|
struct sk_buff *skb;
|
|
|
|
error = sock_error(sk);
|
|
if (error)
|
|
break;
|
|
|
|
error = -EAGAIN;
|
|
*peeked = 0;
|
|
do {
|
|
spin_lock_bh(&queue->lock);
|
|
skb = __skb_try_recv_from_queue(sk, queue, flags,
|
|
udp_skb_destructor,
|
|
peeked, off, err,
|
|
&last);
|
|
if (skb) {
|
|
spin_unlock_bh(&queue->lock);
|
|
return skb;
|
|
}
|
|
|
|
if (skb_queue_empty(sk_queue)) {
|
|
spin_unlock_bh(&queue->lock);
|
|
goto busy_check;
|
|
}
|
|
|
|
/* refill the reader queue and walk it again
|
|
* keep both queues locked to avoid re-acquiring
|
|
* the sk_receive_queue lock if fwd memory scheduling
|
|
* is needed.
|
|
*/
|
|
spin_lock(&sk_queue->lock);
|
|
skb_queue_splice_tail_init(sk_queue, queue);
|
|
|
|
skb = __skb_try_recv_from_queue(sk, queue, flags,
|
|
udp_skb_dtor_locked,
|
|
peeked, off, err,
|
|
&last);
|
|
spin_unlock(&sk_queue->lock);
|
|
spin_unlock_bh(&queue->lock);
|
|
if (skb)
|
|
return skb;
|
|
|
|
busy_check:
|
|
if (!sk_can_busy_loop(sk))
|
|
break;
|
|
|
|
sk_busy_loop(sk, flags & MSG_DONTWAIT);
|
|
} while (!skb_queue_empty(sk_queue));
|
|
|
|
/* sk_queue is empty, reader_queue may contain peeked packets */
|
|
} while (timeo &&
|
|
!__skb_wait_for_more_packets(sk, &error, &timeo,
|
|
(struct sk_buff *)sk_queue));
|
|
|
|
*err = error;
|
|
return NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__skb_recv_udp);
|
|
|
|
/*
|
|
* This should be easy, if there is something there we
|
|
* return it, otherwise we block.
|
|
*/
|
|
|
|
int udp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, int noblock,
|
|
int flags, int *addr_len)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_in *, sin, msg->msg_name);
|
|
struct sk_buff *skb;
|
|
unsigned int ulen, copied;
|
|
int peeked, peeking, off;
|
|
int err;
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
bool checksum_valid = false;
|
|
|
|
if (flags & MSG_ERRQUEUE)
|
|
return ip_recv_error(sk, msg, len, addr_len);
|
|
|
|
try_again:
|
|
peeking = flags & MSG_PEEK;
|
|
off = sk_peek_offset(sk, flags);
|
|
skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err);
|
|
if (!skb)
|
|
return err;
|
|
|
|
ulen = udp_skb_len(skb);
|
|
copied = len;
|
|
if (copied > ulen - off)
|
|
copied = ulen - off;
|
|
else if (copied < ulen)
|
|
msg->msg_flags |= MSG_TRUNC;
|
|
|
|
/*
|
|
* If checksum is needed at all, try to do it while copying the
|
|
* data. If the data is truncated, or if we only want a partial
|
|
* coverage checksum (UDP-Lite), do it before the copy.
|
|
*/
|
|
|
|
if (copied < ulen || peeking ||
|
|
(is_udplite && UDP_SKB_CB(skb)->partial_cov)) {
|
|
checksum_valid = udp_skb_csum_unnecessary(skb) ||
|
|
!__udp_lib_checksum_complete(skb);
|
|
if (!checksum_valid)
|
|
goto csum_copy_err;
|
|
}
|
|
|
|
if (checksum_valid || udp_skb_csum_unnecessary(skb)) {
|
|
if (udp_skb_is_linear(skb))
|
|
err = copy_linear_skb(skb, copied, off, &msg->msg_iter);
|
|
else
|
|
err = skb_copy_datagram_msg(skb, off, msg, copied);
|
|
} else {
|
|
err = skb_copy_and_csum_datagram_msg(skb, off, msg);
|
|
|
|
if (err == -EINVAL)
|
|
goto csum_copy_err;
|
|
}
|
|
|
|
if (unlikely(err)) {
|
|
if (!peeked) {
|
|
atomic_inc(&sk->sk_drops);
|
|
UDP_INC_STATS(sock_net(sk),
|
|
UDP_MIB_INERRORS, is_udplite);
|
|
}
|
|
kfree_skb(skb);
|
|
return err;
|
|
}
|
|
|
|
if (!peeked)
|
|
UDP_INC_STATS(sock_net(sk),
|
|
UDP_MIB_INDATAGRAMS, is_udplite);
|
|
|
|
sock_recv_ts_and_drops(msg, sk, skb);
|
|
|
|
/* Copy the address. */
|
|
if (sin) {
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_port = udp_hdr(skb)->source;
|
|
sin->sin_addr.s_addr = ip_hdr(skb)->saddr;
|
|
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
*addr_len = sizeof(*sin);
|
|
}
|
|
if (inet->cmsg_flags)
|
|
ip_cmsg_recv_offset(msg, sk, skb, sizeof(struct udphdr), off);
|
|
|
|
err = copied;
|
|
if (flags & MSG_TRUNC)
|
|
err = ulen;
|
|
|
|
skb_consume_udp(sk, skb, peeking ? -err : err);
|
|
return err;
|
|
|
|
csum_copy_err:
|
|
if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags,
|
|
udp_skb_destructor)) {
|
|
UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
|
|
UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
|
|
}
|
|
kfree_skb(skb);
|
|
|
|
/* starting over for a new packet, but check if we need to yield */
|
|
cond_resched();
|
|
msg->msg_flags &= ~MSG_TRUNC;
|
|
goto try_again;
|
|
}
|
|
|
|
int __udp_disconnect(struct sock *sk, int flags)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
/*
|
|
* 1003.1g - break association.
|
|
*/
|
|
|
|
sk->sk_state = TCP_CLOSE;
|
|
inet->inet_daddr = 0;
|
|
inet->inet_dport = 0;
|
|
sock_rps_reset_rxhash(sk);
|
|
sk->sk_bound_dev_if = 0;
|
|
if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK))
|
|
inet_reset_saddr(sk);
|
|
|
|
if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) {
|
|
sk->sk_prot->unhash(sk);
|
|
inet->inet_sport = 0;
|
|
}
|
|
sk_dst_reset(sk);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(__udp_disconnect);
|
|
|
|
int udp_disconnect(struct sock *sk, int flags)
|
|
{
|
|
lock_sock(sk);
|
|
__udp_disconnect(sk, flags);
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(udp_disconnect);
|
|
|
|
void udp_lib_unhash(struct sock *sk)
|
|
{
|
|
if (sk_hashed(sk)) {
|
|
struct udp_table *udptable = sk->sk_prot->h.udp_table;
|
|
struct udp_hslot *hslot, *hslot2;
|
|
|
|
hslot = udp_hashslot(udptable, sock_net(sk),
|
|
udp_sk(sk)->udp_port_hash);
|
|
hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
|
|
|
|
spin_lock_bh(&hslot->lock);
|
|
if (rcu_access_pointer(sk->sk_reuseport_cb))
|
|
reuseport_detach_sock(sk);
|
|
if (sk_del_node_init_rcu(sk)) {
|
|
hslot->count--;
|
|
inet_sk(sk)->inet_num = 0;
|
|
sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1);
|
|
|
|
spin_lock(&hslot2->lock);
|
|
hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
|
|
hslot2->count--;
|
|
spin_unlock(&hslot2->lock);
|
|
}
|
|
spin_unlock_bh(&hslot->lock);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(udp_lib_unhash);
|
|
|
|
/*
|
|
* inet_rcv_saddr was changed, we must rehash secondary hash
|
|
*/
|
|
void udp_lib_rehash(struct sock *sk, u16 newhash)
|
|
{
|
|
if (sk_hashed(sk)) {
|
|
struct udp_table *udptable = sk->sk_prot->h.udp_table;
|
|
struct udp_hslot *hslot, *hslot2, *nhslot2;
|
|
|
|
hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash);
|
|
nhslot2 = udp_hashslot2(udptable, newhash);
|
|
udp_sk(sk)->udp_portaddr_hash = newhash;
|
|
|
|
if (hslot2 != nhslot2 ||
|
|
rcu_access_pointer(sk->sk_reuseport_cb)) {
|
|
hslot = udp_hashslot(udptable, sock_net(sk),
|
|
udp_sk(sk)->udp_port_hash);
|
|
/* we must lock primary chain too */
|
|
spin_lock_bh(&hslot->lock);
|
|
if (rcu_access_pointer(sk->sk_reuseport_cb))
|
|
reuseport_detach_sock(sk);
|
|
|
|
if (hslot2 != nhslot2) {
|
|
spin_lock(&hslot2->lock);
|
|
hlist_del_init_rcu(&udp_sk(sk)->udp_portaddr_node);
|
|
hslot2->count--;
|
|
spin_unlock(&hslot2->lock);
|
|
|
|
spin_lock(&nhslot2->lock);
|
|
hlist_add_head_rcu(&udp_sk(sk)->udp_portaddr_node,
|
|
&nhslot2->head);
|
|
nhslot2->count++;
|
|
spin_unlock(&nhslot2->lock);
|
|
}
|
|
|
|
spin_unlock_bh(&hslot->lock);
|
|
}
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(udp_lib_rehash);
|
|
|
|
static void udp_v4_rehash(struct sock *sk)
|
|
{
|
|
u16 new_hash = udp4_portaddr_hash(sock_net(sk),
|
|
inet_sk(sk)->inet_rcv_saddr,
|
|
inet_sk(sk)->inet_num);
|
|
udp_lib_rehash(sk, new_hash);
|
|
}
|
|
|
|
static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
int rc;
|
|
|
|
if (inet_sk(sk)->inet_daddr) {
|
|
sock_rps_save_rxhash(sk, skb);
|
|
sk_mark_napi_id(sk, skb);
|
|
sk_incoming_cpu_update(sk);
|
|
} else {
|
|
sk_mark_napi_id_once(sk, skb);
|
|
}
|
|
|
|
rc = __udp_enqueue_schedule_skb(sk, skb);
|
|
if (rc < 0) {
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
|
|
/* Note that an ENOMEM error is charged twice */
|
|
if (rc == -ENOMEM)
|
|
UDP_INC_STATS(sock_net(sk), UDP_MIB_RCVBUFERRORS,
|
|
is_udplite);
|
|
UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
|
|
kfree_skb(skb);
|
|
trace_udp_fail_queue_rcv_skb(rc, sk);
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct static_key udp_encap_needed __read_mostly;
|
|
void udp_encap_enable(void)
|
|
{
|
|
if (!static_key_enabled(&udp_encap_needed))
|
|
static_key_slow_inc(&udp_encap_needed);
|
|
}
|
|
EXPORT_SYMBOL(udp_encap_enable);
|
|
|
|
/* returns:
|
|
* -1: error
|
|
* 0: success
|
|
* >0: "udp encap" protocol resubmission
|
|
*
|
|
* Note that in the success and error cases, the skb is assumed to
|
|
* have either been requeued or freed.
|
|
*/
|
|
static int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
|
|
/*
|
|
* Charge it to the socket, dropping if the queue is full.
|
|
*/
|
|
if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb))
|
|
goto drop;
|
|
nf_reset(skb);
|
|
|
|
if (static_key_false(&udp_encap_needed) && up->encap_type) {
|
|
int (*encap_rcv)(struct sock *sk, struct sk_buff *skb);
|
|
|
|
/*
|
|
* This is an encapsulation socket so pass the skb to
|
|
* the socket's udp_encap_rcv() hook. Otherwise, just
|
|
* fall through and pass this up the UDP socket.
|
|
* up->encap_rcv() returns the following value:
|
|
* =0 if skb was successfully passed to the encap
|
|
* handler or was discarded by it.
|
|
* >0 if skb should be passed on to UDP.
|
|
* <0 if skb should be resubmitted as proto -N
|
|
*/
|
|
|
|
/* if we're overly short, let UDP handle it */
|
|
encap_rcv = ACCESS_ONCE(up->encap_rcv);
|
|
if (encap_rcv) {
|
|
int ret;
|
|
|
|
/* Verify checksum before giving to encap */
|
|
if (udp_lib_checksum_complete(skb))
|
|
goto csum_error;
|
|
|
|
ret = encap_rcv(sk, skb);
|
|
if (ret <= 0) {
|
|
__UDP_INC_STATS(sock_net(sk),
|
|
UDP_MIB_INDATAGRAMS,
|
|
is_udplite);
|
|
return -ret;
|
|
}
|
|
}
|
|
|
|
/* FALLTHROUGH -- it's a UDP Packet */
|
|
}
|
|
|
|
/*
|
|
* UDP-Lite specific tests, ignored on UDP sockets
|
|
*/
|
|
if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) {
|
|
|
|
/*
|
|
* MIB statistics other than incrementing the error count are
|
|
* disabled for the following two types of errors: these depend
|
|
* on the application settings, not on the functioning of the
|
|
* protocol stack as such.
|
|
*
|
|
* RFC 3828 here recommends (sec 3.3): "There should also be a
|
|
* way ... to ... at least let the receiving application block
|
|
* delivery of packets with coverage values less than a value
|
|
* provided by the application."
|
|
*/
|
|
if (up->pcrlen == 0) { /* full coverage was set */
|
|
net_dbg_ratelimited("UDPLite: partial coverage %d while full coverage %d requested\n",
|
|
UDP_SKB_CB(skb)->cscov, skb->len);
|
|
goto drop;
|
|
}
|
|
/* The next case involves violating the min. coverage requested
|
|
* by the receiver. This is subtle: if receiver wants x and x is
|
|
* greater than the buffersize/MTU then receiver will complain
|
|
* that it wants x while sender emits packets of smaller size y.
|
|
* Therefore the above ...()->partial_cov statement is essential.
|
|
*/
|
|
if (UDP_SKB_CB(skb)->cscov < up->pcrlen) {
|
|
net_dbg_ratelimited("UDPLite: coverage %d too small, need min %d\n",
|
|
UDP_SKB_CB(skb)->cscov, up->pcrlen);
|
|
goto drop;
|
|
}
|
|
}
|
|
|
|
prefetch(&sk->sk_rmem_alloc);
|
|
if (rcu_access_pointer(sk->sk_filter) &&
|
|
udp_lib_checksum_complete(skb))
|
|
goto csum_error;
|
|
|
|
if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr)))
|
|
goto drop;
|
|
|
|
udp_csum_pull_header(skb);
|
|
|
|
ipv4_pktinfo_prepare(sk, skb);
|
|
return __udp_queue_rcv_skb(sk, skb);
|
|
|
|
csum_error:
|
|
__UDP_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite);
|
|
drop:
|
|
__UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite);
|
|
atomic_inc(&sk->sk_drops);
|
|
kfree_skb(skb);
|
|
return -1;
|
|
}
|
|
|
|
/* For TCP sockets, sk_rx_dst is protected by socket lock
|
|
* For UDP, we use xchg() to guard against concurrent changes.
|
|
*/
|
|
bool udp_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst)
|
|
{
|
|
struct dst_entry *old;
|
|
|
|
if (dst_hold_safe(dst)) {
|
|
old = xchg(&sk->sk_rx_dst, dst);
|
|
dst_release(old);
|
|
return old != dst;
|
|
}
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL(udp_sk_rx_dst_set);
|
|
|
|
/*
|
|
* Multicasts and broadcasts go to each listener.
|
|
*
|
|
* Note: called only from the BH handler context.
|
|
*/
|
|
static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb,
|
|
struct udphdr *uh,
|
|
__be32 saddr, __be32 daddr,
|
|
struct udp_table *udptable,
|
|
int proto)
|
|
{
|
|
struct sock *sk, *first = NULL;
|
|
unsigned short hnum = ntohs(uh->dest);
|
|
struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum);
|
|
unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10);
|
|
unsigned int offset = offsetof(typeof(*sk), sk_node);
|
|
int dif = skb->dev->ifindex;
|
|
int sdif = inet_sdif(skb);
|
|
struct hlist_node *node;
|
|
struct sk_buff *nskb;
|
|
|
|
if (use_hash2) {
|
|
hash2_any = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum) &
|
|
udptable->mask;
|
|
hash2 = udp4_portaddr_hash(net, daddr, hnum) & udptable->mask;
|
|
start_lookup:
|
|
hslot = &udptable->hash2[hash2];
|
|
offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node);
|
|
}
|
|
|
|
sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) {
|
|
if (!__udp_is_mcast_sock(net, sk, uh->dest, daddr,
|
|
uh->source, saddr, dif, sdif, hnum))
|
|
continue;
|
|
|
|
if (!first) {
|
|
first = sk;
|
|
continue;
|
|
}
|
|
nskb = skb_clone(skb, GFP_ATOMIC);
|
|
|
|
if (unlikely(!nskb)) {
|
|
atomic_inc(&sk->sk_drops);
|
|
__UDP_INC_STATS(net, UDP_MIB_RCVBUFERRORS,
|
|
IS_UDPLITE(sk));
|
|
__UDP_INC_STATS(net, UDP_MIB_INERRORS,
|
|
IS_UDPLITE(sk));
|
|
continue;
|
|
}
|
|
if (udp_queue_rcv_skb(sk, nskb) > 0)
|
|
consume_skb(nskb);
|
|
}
|
|
|
|
/* Also lookup *:port if we are using hash2 and haven't done so yet. */
|
|
if (use_hash2 && hash2 != hash2_any) {
|
|
hash2 = hash2_any;
|
|
goto start_lookup;
|
|
}
|
|
|
|
if (first) {
|
|
if (udp_queue_rcv_skb(first, skb) > 0)
|
|
consume_skb(skb);
|
|
} else {
|
|
kfree_skb(skb);
|
|
__UDP_INC_STATS(net, UDP_MIB_IGNOREDMULTI,
|
|
proto == IPPROTO_UDPLITE);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Initialize UDP checksum. If exited with zero value (success),
|
|
* CHECKSUM_UNNECESSARY means, that no more checks are required.
|
|
* Otherwise, csum completion requires chacksumming packet body,
|
|
* including udp header and folding it to skb->csum.
|
|
*/
|
|
static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh,
|
|
int proto)
|
|
{
|
|
int err;
|
|
|
|
UDP_SKB_CB(skb)->partial_cov = 0;
|
|
UDP_SKB_CB(skb)->cscov = skb->len;
|
|
|
|
if (proto == IPPROTO_UDPLITE) {
|
|
err = udplite_checksum_init(skb, uh);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
/* Note, we are only interested in != 0 or == 0, thus the
|
|
* force to int.
|
|
*/
|
|
return (__force int)skb_checksum_init_zero_check(skb, proto, uh->check,
|
|
inet_compute_pseudo);
|
|
}
|
|
|
|
/*
|
|
* All we need to do is get the socket, and then do a checksum.
|
|
*/
|
|
|
|
int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable,
|
|
int proto)
|
|
{
|
|
struct sock *sk;
|
|
struct udphdr *uh;
|
|
unsigned short ulen;
|
|
struct rtable *rt = skb_rtable(skb);
|
|
__be32 saddr, daddr;
|
|
struct net *net = dev_net(skb->dev);
|
|
|
|
/*
|
|
* Validate the packet.
|
|
*/
|
|
if (!pskb_may_pull(skb, sizeof(struct udphdr)))
|
|
goto drop; /* No space for header. */
|
|
|
|
uh = udp_hdr(skb);
|
|
ulen = ntohs(uh->len);
|
|
saddr = ip_hdr(skb)->saddr;
|
|
daddr = ip_hdr(skb)->daddr;
|
|
|
|
if (ulen > skb->len)
|
|
goto short_packet;
|
|
|
|
if (proto == IPPROTO_UDP) {
|
|
/* UDP validates ulen. */
|
|
if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen))
|
|
goto short_packet;
|
|
uh = udp_hdr(skb);
|
|
}
|
|
|
|
if (udp4_csum_init(skb, uh, proto))
|
|
goto csum_error;
|
|
|
|
sk = skb_steal_sock(skb);
|
|
if (sk) {
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
int ret;
|
|
|
|
if (unlikely(sk->sk_rx_dst != dst))
|
|
udp_sk_rx_dst_set(sk, dst);
|
|
|
|
ret = udp_queue_rcv_skb(sk, skb);
|
|
sock_put(sk);
|
|
/* a return value > 0 means to resubmit the input, but
|
|
* it wants the return to be -protocol, or 0
|
|
*/
|
|
if (ret > 0)
|
|
return -ret;
|
|
return 0;
|
|
}
|
|
|
|
if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST))
|
|
return __udp4_lib_mcast_deliver(net, skb, uh,
|
|
saddr, daddr, udptable, proto);
|
|
|
|
sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable);
|
|
if (sk) {
|
|
int ret;
|
|
|
|
if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk))
|
|
skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check,
|
|
inet_compute_pseudo);
|
|
|
|
ret = udp_queue_rcv_skb(sk, skb);
|
|
|
|
/* a return value > 0 means to resubmit the input, but
|
|
* it wants the return to be -protocol, or 0
|
|
*/
|
|
if (ret > 0)
|
|
return -ret;
|
|
return 0;
|
|
}
|
|
|
|
if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb))
|
|
goto drop;
|
|
nf_reset(skb);
|
|
|
|
/* No socket. Drop packet silently, if checksum is wrong */
|
|
if (udp_lib_checksum_complete(skb))
|
|
goto csum_error;
|
|
|
|
__UDP_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE);
|
|
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
|
|
|
|
/*
|
|
* Hmm. We got an UDP packet to a port to which we
|
|
* don't wanna listen. Ignore it.
|
|
*/
|
|
kfree_skb(skb);
|
|
return 0;
|
|
|
|
short_packet:
|
|
net_dbg_ratelimited("UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n",
|
|
proto == IPPROTO_UDPLITE ? "Lite" : "",
|
|
&saddr, ntohs(uh->source),
|
|
ulen, skb->len,
|
|
&daddr, ntohs(uh->dest));
|
|
goto drop;
|
|
|
|
csum_error:
|
|
/*
|
|
* RFC1122: OK. Discards the bad packet silently (as far as
|
|
* the network is concerned, anyway) as per 4.1.3.4 (MUST).
|
|
*/
|
|
net_dbg_ratelimited("UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n",
|
|
proto == IPPROTO_UDPLITE ? "Lite" : "",
|
|
&saddr, ntohs(uh->source), &daddr, ntohs(uh->dest),
|
|
ulen);
|
|
__UDP_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE);
|
|
drop:
|
|
__UDP_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE);
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
/* We can only early demux multicast if there is a single matching socket.
|
|
* If more than one socket found returns NULL
|
|
*/
|
|
static struct sock *__udp4_lib_mcast_demux_lookup(struct net *net,
|
|
__be16 loc_port, __be32 loc_addr,
|
|
__be16 rmt_port, __be32 rmt_addr,
|
|
int dif, int sdif)
|
|
{
|
|
struct sock *sk, *result;
|
|
unsigned short hnum = ntohs(loc_port);
|
|
unsigned int slot = udp_hashfn(net, hnum, udp_table.mask);
|
|
struct udp_hslot *hslot = &udp_table.hash[slot];
|
|
|
|
/* Do not bother scanning a too big list */
|
|
if (hslot->count > 10)
|
|
return NULL;
|
|
|
|
result = NULL;
|
|
sk_for_each_rcu(sk, &hslot->head) {
|
|
if (__udp_is_mcast_sock(net, sk, loc_port, loc_addr,
|
|
rmt_port, rmt_addr, dif, sdif, hnum)) {
|
|
if (result)
|
|
return NULL;
|
|
result = sk;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/* For unicast we should only early demux connected sockets or we can
|
|
* break forwarding setups. The chains here can be long so only check
|
|
* if the first socket is an exact match and if not move on.
|
|
*/
|
|
static struct sock *__udp4_lib_demux_lookup(struct net *net,
|
|
__be16 loc_port, __be32 loc_addr,
|
|
__be16 rmt_port, __be32 rmt_addr,
|
|
int dif, int sdif)
|
|
{
|
|
unsigned short hnum = ntohs(loc_port);
|
|
unsigned int hash2 = udp4_portaddr_hash(net, loc_addr, hnum);
|
|
unsigned int slot2 = hash2 & udp_table.mask;
|
|
struct udp_hslot *hslot2 = &udp_table.hash2[slot2];
|
|
INET_ADDR_COOKIE(acookie, rmt_addr, loc_addr);
|
|
const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum);
|
|
struct sock *sk;
|
|
|
|
udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) {
|
|
if (INET_MATCH(sk, net, acookie, rmt_addr,
|
|
loc_addr, ports, dif, sdif))
|
|
return sk;
|
|
/* Only check first socket in chain */
|
|
break;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
void udp_v4_early_demux(struct sk_buff *skb)
|
|
{
|
|
struct net *net = dev_net(skb->dev);
|
|
const struct iphdr *iph;
|
|
const struct udphdr *uh;
|
|
struct sock *sk = NULL;
|
|
struct dst_entry *dst;
|
|
int dif = skb->dev->ifindex;
|
|
int sdif = inet_sdif(skb);
|
|
int ours;
|
|
|
|
/* validate the packet */
|
|
if (!pskb_may_pull(skb, skb_transport_offset(skb) + sizeof(struct udphdr)))
|
|
return;
|
|
|
|
iph = ip_hdr(skb);
|
|
uh = udp_hdr(skb);
|
|
|
|
if (skb->pkt_type == PACKET_BROADCAST ||
|
|
skb->pkt_type == PACKET_MULTICAST) {
|
|
struct in_device *in_dev = __in_dev_get_rcu(skb->dev);
|
|
|
|
if (!in_dev)
|
|
return;
|
|
|
|
/* we are supposed to accept bcast packets */
|
|
if (skb->pkt_type == PACKET_MULTICAST) {
|
|
ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr,
|
|
iph->protocol);
|
|
if (!ours)
|
|
return;
|
|
}
|
|
|
|
sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr,
|
|
uh->source, iph->saddr,
|
|
dif, sdif);
|
|
} else if (skb->pkt_type == PACKET_HOST) {
|
|
sk = __udp4_lib_demux_lookup(net, uh->dest, iph->daddr,
|
|
uh->source, iph->saddr, dif, sdif);
|
|
}
|
|
|
|
if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt))
|
|
return;
|
|
|
|
skb->sk = sk;
|
|
skb->destructor = sock_efree;
|
|
dst = READ_ONCE(sk->sk_rx_dst);
|
|
|
|
if (dst)
|
|
dst = dst_check(dst, 0);
|
|
if (dst) {
|
|
/* set noref for now.
|
|
* any place which wants to hold dst has to call
|
|
* dst_hold_safe()
|
|
*/
|
|
skb_dst_set_noref(skb, dst);
|
|
}
|
|
}
|
|
|
|
int udp_rcv(struct sk_buff *skb)
|
|
{
|
|
return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP);
|
|
}
|
|
|
|
void udp_destroy_sock(struct sock *sk)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
bool slow = lock_sock_fast(sk);
|
|
udp_flush_pending_frames(sk);
|
|
unlock_sock_fast(sk, slow);
|
|
if (static_key_false(&udp_encap_needed) && up->encap_type) {
|
|
void (*encap_destroy)(struct sock *sk);
|
|
encap_destroy = ACCESS_ONCE(up->encap_destroy);
|
|
if (encap_destroy)
|
|
encap_destroy(sk);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Socket option code for UDP
|
|
*/
|
|
int udp_lib_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen,
|
|
int (*push_pending_frames)(struct sock *))
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
int val, valbool;
|
|
int err = 0;
|
|
int is_udplite = IS_UDPLITE(sk);
|
|
|
|
if (optlen < sizeof(int))
|
|
return -EINVAL;
|
|
|
|
if (get_user(val, (int __user *)optval))
|
|
return -EFAULT;
|
|
|
|
valbool = val ? 1 : 0;
|
|
|
|
switch (optname) {
|
|
case UDP_CORK:
|
|
if (val != 0) {
|
|
up->corkflag = 1;
|
|
} else {
|
|
up->corkflag = 0;
|
|
lock_sock(sk);
|
|
push_pending_frames(sk);
|
|
release_sock(sk);
|
|
}
|
|
break;
|
|
|
|
case UDP_ENCAP:
|
|
switch (val) {
|
|
case 0:
|
|
case UDP_ENCAP_ESPINUDP:
|
|
case UDP_ENCAP_ESPINUDP_NON_IKE:
|
|
up->encap_rcv = xfrm4_udp_encap_rcv;
|
|
/* FALLTHROUGH */
|
|
case UDP_ENCAP_L2TPINUDP:
|
|
up->encap_type = val;
|
|
udp_encap_enable();
|
|
break;
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case UDP_NO_CHECK6_TX:
|
|
up->no_check6_tx = valbool;
|
|
break;
|
|
|
|
case UDP_NO_CHECK6_RX:
|
|
up->no_check6_rx = valbool;
|
|
break;
|
|
|
|
/*
|
|
* UDP-Lite's partial checksum coverage (RFC 3828).
|
|
*/
|
|
/* The sender sets actual checksum coverage length via this option.
|
|
* The case coverage > packet length is handled by send module. */
|
|
case UDPLITE_SEND_CSCOV:
|
|
if (!is_udplite) /* Disable the option on UDP sockets */
|
|
return -ENOPROTOOPT;
|
|
if (val != 0 && val < 8) /* Illegal coverage: use default (8) */
|
|
val = 8;
|
|
else if (val > USHRT_MAX)
|
|
val = USHRT_MAX;
|
|
up->pcslen = val;
|
|
up->pcflag |= UDPLITE_SEND_CC;
|
|
break;
|
|
|
|
/* The receiver specifies a minimum checksum coverage value. To make
|
|
* sense, this should be set to at least 8 (as done below). If zero is
|
|
* used, this again means full checksum coverage. */
|
|
case UDPLITE_RECV_CSCOV:
|
|
if (!is_udplite) /* Disable the option on UDP sockets */
|
|
return -ENOPROTOOPT;
|
|
if (val != 0 && val < 8) /* Avoid silly minimal values. */
|
|
val = 8;
|
|
else if (val > USHRT_MAX)
|
|
val = USHRT_MAX;
|
|
up->pcrlen = val;
|
|
up->pcflag |= UDPLITE_RECV_CC;
|
|
break;
|
|
|
|
default:
|
|
err = -ENOPROTOOPT;
|
|
break;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(udp_lib_setsockopt);
|
|
|
|
int udp_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
if (level == SOL_UDP || level == SOL_UDPLITE)
|
|
return udp_lib_setsockopt(sk, level, optname, optval, optlen,
|
|
udp_push_pending_frames);
|
|
return ip_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_udp_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
if (level == SOL_UDP || level == SOL_UDPLITE)
|
|
return udp_lib_setsockopt(sk, level, optname, optval, optlen,
|
|
udp_push_pending_frames);
|
|
return compat_ip_setsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
#endif
|
|
|
|
int udp_lib_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
struct udp_sock *up = udp_sk(sk);
|
|
int val, len;
|
|
|
|
if (get_user(len, optlen))
|
|
return -EFAULT;
|
|
|
|
len = min_t(unsigned int, len, sizeof(int));
|
|
|
|
if (len < 0)
|
|
return -EINVAL;
|
|
|
|
switch (optname) {
|
|
case UDP_CORK:
|
|
val = up->corkflag;
|
|
break;
|
|
|
|
case UDP_ENCAP:
|
|
val = up->encap_type;
|
|
break;
|
|
|
|
case UDP_NO_CHECK6_TX:
|
|
val = up->no_check6_tx;
|
|
break;
|
|
|
|
case UDP_NO_CHECK6_RX:
|
|
val = up->no_check6_rx;
|
|
break;
|
|
|
|
/* The following two cannot be changed on UDP sockets, the return is
|
|
* always 0 (which corresponds to the full checksum coverage of UDP). */
|
|
case UDPLITE_SEND_CSCOV:
|
|
val = up->pcslen;
|
|
break;
|
|
|
|
case UDPLITE_RECV_CSCOV:
|
|
val = up->pcrlen;
|
|
break;
|
|
|
|
default:
|
|
return -ENOPROTOOPT;
|
|
}
|
|
|
|
if (put_user(len, optlen))
|
|
return -EFAULT;
|
|
if (copy_to_user(optval, &val, len))
|
|
return -EFAULT;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(udp_lib_getsockopt);
|
|
|
|
int udp_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
if (level == SOL_UDP || level == SOL_UDPLITE)
|
|
return udp_lib_getsockopt(sk, level, optname, optval, optlen);
|
|
return ip_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
int compat_udp_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *optlen)
|
|
{
|
|
if (level == SOL_UDP || level == SOL_UDPLITE)
|
|
return udp_lib_getsockopt(sk, level, optname, optval, optlen);
|
|
return compat_ip_getsockopt(sk, level, optname, optval, optlen);
|
|
}
|
|
#endif
|
|
/**
|
|
* udp_poll - wait for a UDP event.
|
|
* @file - file struct
|
|
* @sock - socket
|
|
* @wait - poll table
|
|
*
|
|
* This is same as datagram poll, except for the special case of
|
|
* blocking sockets. If application is using a blocking fd
|
|
* and a packet with checksum error is in the queue;
|
|
* then it could get return from select indicating data available
|
|
* but then block when reading it. Add special case code
|
|
* to work around these arguably broken applications.
|
|
*/
|
|
unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait)
|
|
{
|
|
unsigned int mask = datagram_poll(file, sock, wait);
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (!skb_queue_empty(&udp_sk(sk)->reader_queue))
|
|
mask |= POLLIN | POLLRDNORM;
|
|
|
|
sock_rps_record_flow(sk);
|
|
|
|
/* Check for false positives due to checksum errors */
|
|
if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) &&
|
|
!(sk->sk_shutdown & RCV_SHUTDOWN) && first_packet_length(sk) == -1)
|
|
mask &= ~(POLLIN | POLLRDNORM);
|
|
|
|
return mask;
|
|
|
|
}
|
|
EXPORT_SYMBOL(udp_poll);
|
|
|
|
int udp_abort(struct sock *sk, int err)
|
|
{
|
|
lock_sock(sk);
|
|
|
|
sk->sk_err = err;
|
|
sk->sk_error_report(sk);
|
|
__udp_disconnect(sk, 0);
|
|
|
|
release_sock(sk);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(udp_abort);
|
|
|
|
struct proto udp_prot = {
|
|
.name = "UDP",
|
|
.owner = THIS_MODULE,
|
|
.close = udp_lib_close,
|
|
.connect = ip4_datagram_connect,
|
|
.disconnect = udp_disconnect,
|
|
.ioctl = udp_ioctl,
|
|
.init = udp_init_sock,
|
|
.destroy = udp_destroy_sock,
|
|
.setsockopt = udp_setsockopt,
|
|
.getsockopt = udp_getsockopt,
|
|
.sendmsg = udp_sendmsg,
|
|
.recvmsg = udp_recvmsg,
|
|
.sendpage = udp_sendpage,
|
|
.release_cb = ip4_datagram_release_cb,
|
|
.hash = udp_lib_hash,
|
|
.unhash = udp_lib_unhash,
|
|
.rehash = udp_v4_rehash,
|
|
.get_port = udp_v4_get_port,
|
|
.memory_allocated = &udp_memory_allocated,
|
|
.sysctl_mem = sysctl_udp_mem,
|
|
.sysctl_wmem = &sysctl_udp_wmem_min,
|
|
.sysctl_rmem = &sysctl_udp_rmem_min,
|
|
.obj_size = sizeof(struct udp_sock),
|
|
.h.udp_table = &udp_table,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_udp_setsockopt,
|
|
.compat_getsockopt = compat_udp_getsockopt,
|
|
#endif
|
|
.diag_destroy = udp_abort,
|
|
};
|
|
EXPORT_SYMBOL(udp_prot);
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
#ifdef CONFIG_PROC_FS
|
|
|
|
static struct sock *udp_get_first(struct seq_file *seq, int start)
|
|
{
|
|
struct sock *sk;
|
|
struct udp_iter_state *state = seq->private;
|
|
struct net *net = seq_file_net(seq);
|
|
|
|
for (state->bucket = start; state->bucket <= state->udp_table->mask;
|
|
++state->bucket) {
|
|
struct udp_hslot *hslot = &state->udp_table->hash[state->bucket];
|
|
|
|
if (hlist_empty(&hslot->head))
|
|
continue;
|
|
|
|
spin_lock_bh(&hslot->lock);
|
|
sk_for_each(sk, &hslot->head) {
|
|
if (!net_eq(sock_net(sk), net))
|
|
continue;
|
|
if (sk->sk_family == state->family)
|
|
goto found;
|
|
}
|
|
spin_unlock_bh(&hslot->lock);
|
|
}
|
|
sk = NULL;
|
|
found:
|
|
return sk;
|
|
}
|
|
|
|
static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk)
|
|
{
|
|
struct udp_iter_state *state = seq->private;
|
|
struct net *net = seq_file_net(seq);
|
|
|
|
do {
|
|
sk = sk_next(sk);
|
|
} while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family));
|
|
|
|
if (!sk) {
|
|
if (state->bucket <= state->udp_table->mask)
|
|
spin_unlock_bh(&state->udp_table->hash[state->bucket].lock);
|
|
return udp_get_first(seq, state->bucket + 1);
|
|
}
|
|
return sk;
|
|
}
|
|
|
|
static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos)
|
|
{
|
|
struct sock *sk = udp_get_first(seq, 0);
|
|
|
|
if (sk)
|
|
while (pos && (sk = udp_get_next(seq, sk)) != NULL)
|
|
--pos;
|
|
return pos ? NULL : sk;
|
|
}
|
|
|
|
static void *udp_seq_start(struct seq_file *seq, loff_t *pos)
|
|
{
|
|
struct udp_iter_state *state = seq->private;
|
|
state->bucket = MAX_UDP_PORTS;
|
|
|
|
return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN;
|
|
}
|
|
|
|
static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
|
|
{
|
|
struct sock *sk;
|
|
|
|
if (v == SEQ_START_TOKEN)
|
|
sk = udp_get_idx(seq, 0);
|
|
else
|
|
sk = udp_get_next(seq, v);
|
|
|
|
++*pos;
|
|
return sk;
|
|
}
|
|
|
|
static void udp_seq_stop(struct seq_file *seq, void *v)
|
|
{
|
|
struct udp_iter_state *state = seq->private;
|
|
|
|
if (state->bucket <= state->udp_table->mask)
|
|
spin_unlock_bh(&state->udp_table->hash[state->bucket].lock);
|
|
}
|
|
|
|
int udp_seq_open(struct inode *inode, struct file *file)
|
|
{
|
|
struct udp_seq_afinfo *afinfo = PDE_DATA(inode);
|
|
struct udp_iter_state *s;
|
|
int err;
|
|
|
|
err = seq_open_net(inode, file, &afinfo->seq_ops,
|
|
sizeof(struct udp_iter_state));
|
|
if (err < 0)
|
|
return err;
|
|
|
|
s = ((struct seq_file *)file->private_data)->private;
|
|
s->family = afinfo->family;
|
|
s->udp_table = afinfo->udp_table;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(udp_seq_open);
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo)
|
|
{
|
|
struct proc_dir_entry *p;
|
|
int rc = 0;
|
|
|
|
afinfo->seq_ops.start = udp_seq_start;
|
|
afinfo->seq_ops.next = udp_seq_next;
|
|
afinfo->seq_ops.stop = udp_seq_stop;
|
|
|
|
p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net,
|
|
afinfo->seq_fops, afinfo);
|
|
if (!p)
|
|
rc = -ENOMEM;
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL(udp_proc_register);
|
|
|
|
void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo)
|
|
{
|
|
remove_proc_entry(afinfo->name, net->proc_net);
|
|
}
|
|
EXPORT_SYMBOL(udp_proc_unregister);
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
static void udp4_format_sock(struct sock *sp, struct seq_file *f,
|
|
int bucket)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sp);
|
|
__be32 dest = inet->inet_daddr;
|
|
__be32 src = inet->inet_rcv_saddr;
|
|
__u16 destp = ntohs(inet->inet_dport);
|
|
__u16 srcp = ntohs(inet->inet_sport);
|
|
|
|
seq_printf(f, "%5d: %08X:%04X %08X:%04X"
|
|
" %02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d",
|
|
bucket, src, srcp, dest, destp, sp->sk_state,
|
|
sk_wmem_alloc_get(sp),
|
|
sk_rmem_alloc_get(sp),
|
|
0, 0L, 0,
|
|
from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)),
|
|
0, sock_i_ino(sp),
|
|
refcount_read(&sp->sk_refcnt), sp,
|
|
atomic_read(&sp->sk_drops));
|
|
}
|
|
|
|
int udp4_seq_show(struct seq_file *seq, void *v)
|
|
{
|
|
seq_setwidth(seq, 127);
|
|
if (v == SEQ_START_TOKEN)
|
|
seq_puts(seq, " sl local_address rem_address st tx_queue "
|
|
"rx_queue tr tm->when retrnsmt uid timeout "
|
|
"inode ref pointer drops");
|
|
else {
|
|
struct udp_iter_state *state = seq->private;
|
|
|
|
udp4_format_sock(v, seq, state->bucket);
|
|
}
|
|
seq_pad(seq, '\n');
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations udp_afinfo_seq_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = udp_seq_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = seq_release_net
|
|
};
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
static struct udp_seq_afinfo udp4_seq_afinfo = {
|
|
.name = "udp",
|
|
.family = AF_INET,
|
|
.udp_table = &udp_table,
|
|
.seq_fops = &udp_afinfo_seq_fops,
|
|
.seq_ops = {
|
|
.show = udp4_seq_show,
|
|
},
|
|
};
|
|
|
|
static int __net_init udp4_proc_init_net(struct net *net)
|
|
{
|
|
return udp_proc_register(net, &udp4_seq_afinfo);
|
|
}
|
|
|
|
static void __net_exit udp4_proc_exit_net(struct net *net)
|
|
{
|
|
udp_proc_unregister(net, &udp4_seq_afinfo);
|
|
}
|
|
|
|
static struct pernet_operations udp4_net_ops = {
|
|
.init = udp4_proc_init_net,
|
|
.exit = udp4_proc_exit_net,
|
|
};
|
|
|
|
int __init udp4_proc_init(void)
|
|
{
|
|
return register_pernet_subsys(&udp4_net_ops);
|
|
}
|
|
|
|
void udp4_proc_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&udp4_net_ops);
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
static __initdata unsigned long uhash_entries;
|
|
static int __init set_uhash_entries(char *str)
|
|
{
|
|
ssize_t ret;
|
|
|
|
if (!str)
|
|
return 0;
|
|
|
|
ret = kstrtoul(str, 0, &uhash_entries);
|
|
if (ret)
|
|
return 0;
|
|
|
|
if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN)
|
|
uhash_entries = UDP_HTABLE_SIZE_MIN;
|
|
return 1;
|
|
}
|
|
__setup("uhash_entries=", set_uhash_entries);
|
|
|
|
void __init udp_table_init(struct udp_table *table, const char *name)
|
|
{
|
|
unsigned int i;
|
|
|
|
table->hash = alloc_large_system_hash(name,
|
|
2 * sizeof(struct udp_hslot),
|
|
uhash_entries,
|
|
21, /* one slot per 2 MB */
|
|
0,
|
|
&table->log,
|
|
&table->mask,
|
|
UDP_HTABLE_SIZE_MIN,
|
|
64 * 1024);
|
|
|
|
table->hash2 = table->hash + (table->mask + 1);
|
|
for (i = 0; i <= table->mask; i++) {
|
|
INIT_HLIST_HEAD(&table->hash[i].head);
|
|
table->hash[i].count = 0;
|
|
spin_lock_init(&table->hash[i].lock);
|
|
}
|
|
for (i = 0; i <= table->mask; i++) {
|
|
INIT_HLIST_HEAD(&table->hash2[i].head);
|
|
table->hash2[i].count = 0;
|
|
spin_lock_init(&table->hash2[i].lock);
|
|
}
|
|
}
|
|
|
|
u32 udp_flow_hashrnd(void)
|
|
{
|
|
static u32 hashrnd __read_mostly;
|
|
|
|
net_get_random_once(&hashrnd, sizeof(hashrnd));
|
|
|
|
return hashrnd;
|
|
}
|
|
EXPORT_SYMBOL(udp_flow_hashrnd);
|
|
|
|
void __init udp_init(void)
|
|
{
|
|
unsigned long limit;
|
|
unsigned int i;
|
|
|
|
udp_table_init(&udp_table, "UDP");
|
|
limit = nr_free_buffer_pages() / 8;
|
|
limit = max(limit, 128UL);
|
|
sysctl_udp_mem[0] = limit / 4 * 3;
|
|
sysctl_udp_mem[1] = limit;
|
|
sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2;
|
|
|
|
sysctl_udp_rmem_min = SK_MEM_QUANTUM;
|
|
sysctl_udp_wmem_min = SK_MEM_QUANTUM;
|
|
|
|
/* 16 spinlocks per cpu */
|
|
udp_busylocks_log = ilog2(nr_cpu_ids) + 4;
|
|
udp_busylocks = kmalloc(sizeof(spinlock_t) << udp_busylocks_log,
|
|
GFP_KERNEL);
|
|
if (!udp_busylocks)
|
|
panic("UDP: failed to alloc udp_busylocks\n");
|
|
for (i = 0; i < (1U << udp_busylocks_log); i++)
|
|
spin_lock_init(udp_busylocks + i);
|
|
}
|