5811662b15
Use the macros defined for the members of flowi to clean the code up. Signed-off-by: Changli Gao <xiaosuo@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1763 lines
42 KiB
C
1763 lines
42 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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* PF_INET protocol family socket handler.
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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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* Florian La Roche, <flla@stud.uni-sb.de>
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* Alan Cox, <A.Cox@swansea.ac.uk>
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*
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* Changes (see also sock.c)
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*
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* piggy,
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* Karl Knutson : Socket protocol table
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* A.N.Kuznetsov : Socket death error in accept().
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* John Richardson : Fix non blocking error in connect()
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* so sockets that fail to connect
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* don't return -EINPROGRESS.
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* Alan Cox : Asynchronous I/O support
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* Alan Cox : Keep correct socket pointer on sock
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* structures
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* when accept() ed
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* Alan Cox : Semantics of SO_LINGER aren't state
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* moved to close when you look carefully.
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* With this fixed and the accept bug fixed
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* some RPC stuff seems happier.
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* Niibe Yutaka : 4.4BSD style write async I/O
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* Alan Cox,
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* Tony Gale : Fixed reuse semantics.
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* Alan Cox : bind() shouldn't abort existing but dead
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* sockets. Stops FTP netin:.. I hope.
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* Alan Cox : bind() works correctly for RAW sockets.
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* Note that FreeBSD at least was broken
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* in this respect so be careful with
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* compatibility tests...
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* Alan Cox : routing cache support
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* Alan Cox : memzero the socket structure for
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* compactness.
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* Matt Day : nonblock connect error handler
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* Alan Cox : Allow large numbers of pending sockets
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* (eg for big web sites), but only if
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* specifically application requested.
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* Alan Cox : New buffering throughout IP. Used
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* dumbly.
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* Alan Cox : New buffering now used smartly.
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* Alan Cox : BSD rather than common sense
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* interpretation of listen.
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* Germano Caronni : Assorted small races.
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* Alan Cox : sendmsg/recvmsg basic support.
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* Alan Cox : Only sendmsg/recvmsg now supported.
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* Alan Cox : Locked down bind (see security list).
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* Alan Cox : Loosened bind a little.
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* Mike McLagan : ADD/DEL DLCI Ioctls
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* Willy Konynenberg : Transparent proxying support.
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* David S. Miller : New socket lookup architecture.
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* Some other random speedups.
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* Cyrus Durgin : Cleaned up file for kmod hacks.
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* Andi Kleen : Fix inet_stream_connect TCP race.
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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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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/string.h>
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#include <linux/sockios.h>
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#include <linux/net.h>
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#include <linux/capability.h>
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#include <linux/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/stat.h>
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#include <linux/init.h>
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#include <linux/poll.h>
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#include <linux/netfilter_ipv4.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <asm/uaccess.h>
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#include <asm/system.h>
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#include <linux/inet.h>
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#include <linux/igmp.h>
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#include <linux/inetdevice.h>
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#include <linux/netdevice.h>
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#include <net/checksum.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <net/arp.h>
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#include <net/route.h>
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#include <net/ip_fib.h>
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#include <net/inet_connection_sock.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/udplite.h>
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#include <linux/skbuff.h>
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#include <net/sock.h>
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#include <net/raw.h>
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#include <net/icmp.h>
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#include <net/ipip.h>
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#include <net/inet_common.h>
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#include <net/xfrm.h>
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#include <net/net_namespace.h>
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#ifdef CONFIG_IP_MROUTE
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#include <linux/mroute.h>
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#endif
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|
|
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/* The inetsw table contains everything that inet_create needs to
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* build a new socket.
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*/
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static struct list_head inetsw[SOCK_MAX];
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static DEFINE_SPINLOCK(inetsw_lock);
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struct ipv4_config ipv4_config;
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EXPORT_SYMBOL(ipv4_config);
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/* New destruction routine */
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void inet_sock_destruct(struct sock *sk)
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{
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struct inet_sock *inet = inet_sk(sk);
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__skb_queue_purge(&sk->sk_receive_queue);
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__skb_queue_purge(&sk->sk_error_queue);
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sk_mem_reclaim(sk);
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if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
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pr_err("Attempt to release TCP socket in state %d %p\n",
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sk->sk_state, sk);
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return;
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}
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if (!sock_flag(sk, SOCK_DEAD)) {
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pr_err("Attempt to release alive inet socket %p\n", sk);
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return;
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}
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WARN_ON(atomic_read(&sk->sk_rmem_alloc));
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WARN_ON(atomic_read(&sk->sk_wmem_alloc));
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WARN_ON(sk->sk_wmem_queued);
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WARN_ON(sk->sk_forward_alloc);
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kfree(inet->opt);
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dst_release(rcu_dereference_check(sk->sk_dst_cache, 1));
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sk_refcnt_debug_dec(sk);
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}
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EXPORT_SYMBOL(inet_sock_destruct);
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/*
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* The routines beyond this point handle the behaviour of an AF_INET
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* socket object. Mostly it punts to the subprotocols of IP to do
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* the work.
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*/
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/*
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* Automatically bind an unbound socket.
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*/
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static int inet_autobind(struct sock *sk)
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{
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struct inet_sock *inet;
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/* We may need to bind the socket. */
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lock_sock(sk);
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inet = inet_sk(sk);
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if (!inet->inet_num) {
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if (sk->sk_prot->get_port(sk, 0)) {
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release_sock(sk);
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return -EAGAIN;
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}
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inet->inet_sport = htons(inet->inet_num);
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}
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release_sock(sk);
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return 0;
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}
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/*
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* Move a socket into listening state.
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*/
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int inet_listen(struct socket *sock, int backlog)
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{
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struct sock *sk = sock->sk;
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unsigned char old_state;
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int err;
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lock_sock(sk);
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err = -EINVAL;
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if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
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goto out;
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old_state = sk->sk_state;
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if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
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goto out;
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/* Really, if the socket is already in listen state
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* we can only allow the backlog to be adjusted.
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*/
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if (old_state != TCP_LISTEN) {
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err = inet_csk_listen_start(sk, backlog);
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if (err)
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goto out;
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}
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sk->sk_max_ack_backlog = backlog;
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err = 0;
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out:
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release_sock(sk);
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return err;
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}
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EXPORT_SYMBOL(inet_listen);
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u32 inet_ehash_secret __read_mostly;
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EXPORT_SYMBOL(inet_ehash_secret);
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/*
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* inet_ehash_secret must be set exactly once
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*/
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void build_ehash_secret(void)
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{
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u32 rnd;
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do {
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get_random_bytes(&rnd, sizeof(rnd));
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} while (rnd == 0);
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cmpxchg(&inet_ehash_secret, 0, rnd);
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}
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EXPORT_SYMBOL(build_ehash_secret);
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static inline int inet_netns_ok(struct net *net, int protocol)
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{
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int hash;
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const struct net_protocol *ipprot;
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if (net_eq(net, &init_net))
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return 1;
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hash = protocol & (MAX_INET_PROTOS - 1);
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ipprot = rcu_dereference(inet_protos[hash]);
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if (ipprot == NULL)
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/* raw IP is OK */
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return 1;
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return ipprot->netns_ok;
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}
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/*
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* Create an inet socket.
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*/
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static int inet_create(struct net *net, struct socket *sock, int protocol,
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int kern)
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{
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struct sock *sk;
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struct inet_protosw *answer;
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struct inet_sock *inet;
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struct proto *answer_prot;
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unsigned char answer_flags;
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char answer_no_check;
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int try_loading_module = 0;
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int err;
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if (unlikely(!inet_ehash_secret))
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if (sock->type != SOCK_RAW && sock->type != SOCK_DGRAM)
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build_ehash_secret();
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sock->state = SS_UNCONNECTED;
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/* Look for the requested type/protocol pair. */
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lookup_protocol:
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err = -ESOCKTNOSUPPORT;
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rcu_read_lock();
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list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
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err = 0;
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/* Check the non-wild match. */
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if (protocol == answer->protocol) {
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if (protocol != IPPROTO_IP)
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break;
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} else {
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/* Check for the two wild cases. */
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if (IPPROTO_IP == protocol) {
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protocol = answer->protocol;
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break;
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}
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if (IPPROTO_IP == answer->protocol)
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break;
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}
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err = -EPROTONOSUPPORT;
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}
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if (unlikely(err)) {
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if (try_loading_module < 2) {
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rcu_read_unlock();
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/*
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* Be more specific, e.g. net-pf-2-proto-132-type-1
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* (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
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*/
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if (++try_loading_module == 1)
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request_module("net-pf-%d-proto-%d-type-%d",
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PF_INET, protocol, sock->type);
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/*
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* Fall back to generic, e.g. net-pf-2-proto-132
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* (net-pf-PF_INET-proto-IPPROTO_SCTP)
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*/
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else
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request_module("net-pf-%d-proto-%d",
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PF_INET, protocol);
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goto lookup_protocol;
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} else
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goto out_rcu_unlock;
|
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}
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|
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err = -EPERM;
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if (sock->type == SOCK_RAW && !kern && !capable(CAP_NET_RAW))
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goto out_rcu_unlock;
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|
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err = -EAFNOSUPPORT;
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if (!inet_netns_ok(net, protocol))
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goto out_rcu_unlock;
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|
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sock->ops = answer->ops;
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answer_prot = answer->prot;
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answer_no_check = answer->no_check;
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answer_flags = answer->flags;
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rcu_read_unlock();
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|
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WARN_ON(answer_prot->slab == NULL);
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err = -ENOBUFS;
|
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sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot);
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if (sk == NULL)
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goto out;
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err = 0;
|
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sk->sk_no_check = answer_no_check;
|
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if (INET_PROTOSW_REUSE & answer_flags)
|
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sk->sk_reuse = 1;
|
|
|
|
inet = inet_sk(sk);
|
|
inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
|
|
|
|
inet->nodefrag = 0;
|
|
|
|
if (SOCK_RAW == sock->type) {
|
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inet->inet_num = protocol;
|
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if (IPPROTO_RAW == protocol)
|
|
inet->hdrincl = 1;
|
|
}
|
|
|
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if (ipv4_config.no_pmtu_disc)
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inet->pmtudisc = IP_PMTUDISC_DONT;
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else
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inet->pmtudisc = IP_PMTUDISC_WANT;
|
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|
|
inet->inet_id = 0;
|
|
|
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sock_init_data(sock, sk);
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|
|
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sk->sk_destruct = inet_sock_destruct;
|
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sk->sk_protocol = protocol;
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sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
|
|
|
|
inet->uc_ttl = -1;
|
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inet->mc_loop = 1;
|
|
inet->mc_ttl = 1;
|
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inet->mc_all = 1;
|
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inet->mc_index = 0;
|
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inet->mc_list = NULL;
|
|
|
|
sk_refcnt_debug_inc(sk);
|
|
|
|
if (inet->inet_num) {
|
|
/* It assumes that any protocol which allows
|
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* the user to assign a number at socket
|
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* creation time automatically
|
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* shares.
|
|
*/
|
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inet->inet_sport = htons(inet->inet_num);
|
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/* Add to protocol hash chains. */
|
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sk->sk_prot->hash(sk);
|
|
}
|
|
|
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if (sk->sk_prot->init) {
|
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err = sk->sk_prot->init(sk);
|
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if (err)
|
|
sk_common_release(sk);
|
|
}
|
|
out:
|
|
return err;
|
|
out_rcu_unlock:
|
|
rcu_read_unlock();
|
|
goto out;
|
|
}
|
|
|
|
|
|
/*
|
|
* The peer socket should always be NULL (or else). When we call this
|
|
* function we are destroying the object and from then on nobody
|
|
* should refer to it.
|
|
*/
|
|
int inet_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (sk) {
|
|
long timeout;
|
|
|
|
sock_rps_reset_flow(sk);
|
|
|
|
/* Applications forget to leave groups before exiting */
|
|
ip_mc_drop_socket(sk);
|
|
|
|
/* If linger is set, we don't return until the close
|
|
* is complete. Otherwise we return immediately. The
|
|
* actually closing is done the same either way.
|
|
*
|
|
* If the close is due to the process exiting, we never
|
|
* linger..
|
|
*/
|
|
timeout = 0;
|
|
if (sock_flag(sk, SOCK_LINGER) &&
|
|
!(current->flags & PF_EXITING))
|
|
timeout = sk->sk_lingertime;
|
|
sock->sk = NULL;
|
|
sk->sk_prot->close(sk, timeout);
|
|
}
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(inet_release);
|
|
|
|
/* It is off by default, see below. */
|
|
int sysctl_ip_nonlocal_bind __read_mostly;
|
|
EXPORT_SYMBOL(sysctl_ip_nonlocal_bind);
|
|
|
|
int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
|
|
{
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
unsigned short snum;
|
|
int chk_addr_ret;
|
|
int err;
|
|
|
|
/* If the socket has its own bind function then use it. (RAW) */
|
|
if (sk->sk_prot->bind) {
|
|
err = sk->sk_prot->bind(sk, uaddr, addr_len);
|
|
goto out;
|
|
}
|
|
err = -EINVAL;
|
|
if (addr_len < sizeof(struct sockaddr_in))
|
|
goto out;
|
|
|
|
chk_addr_ret = inet_addr_type(sock_net(sk), addr->sin_addr.s_addr);
|
|
|
|
/* Not specified by any standard per-se, however it breaks too
|
|
* many applications when removed. It is unfortunate since
|
|
* allowing applications to make a non-local bind solves
|
|
* several problems with systems using dynamic addressing.
|
|
* (ie. your servers still start up even if your ISDN link
|
|
* is temporarily down)
|
|
*/
|
|
err = -EADDRNOTAVAIL;
|
|
if (!sysctl_ip_nonlocal_bind &&
|
|
!(inet->freebind || inet->transparent) &&
|
|
addr->sin_addr.s_addr != htonl(INADDR_ANY) &&
|
|
chk_addr_ret != RTN_LOCAL &&
|
|
chk_addr_ret != RTN_MULTICAST &&
|
|
chk_addr_ret != RTN_BROADCAST)
|
|
goto out;
|
|
|
|
snum = ntohs(addr->sin_port);
|
|
err = -EACCES;
|
|
if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
|
|
goto out;
|
|
|
|
/* We keep a pair of addresses. rcv_saddr is the one
|
|
* used by hash lookups, and saddr is used for transmit.
|
|
*
|
|
* In the BSD API these are the same except where it
|
|
* would be illegal to use them (multicast/broadcast) in
|
|
* which case the sending device address is used.
|
|
*/
|
|
lock_sock(sk);
|
|
|
|
/* Check these errors (active socket, double bind). */
|
|
err = -EINVAL;
|
|
if (sk->sk_state != TCP_CLOSE || inet->inet_num)
|
|
goto out_release_sock;
|
|
|
|
inet->inet_rcv_saddr = inet->inet_saddr = addr->sin_addr.s_addr;
|
|
if (chk_addr_ret == RTN_MULTICAST || chk_addr_ret == RTN_BROADCAST)
|
|
inet->inet_saddr = 0; /* Use device */
|
|
|
|
/* Make sure we are allowed to bind here. */
|
|
if (sk->sk_prot->get_port(sk, snum)) {
|
|
inet->inet_saddr = inet->inet_rcv_saddr = 0;
|
|
err = -EADDRINUSE;
|
|
goto out_release_sock;
|
|
}
|
|
|
|
if (inet->inet_rcv_saddr)
|
|
sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
|
|
if (snum)
|
|
sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
|
|
inet->inet_sport = htons(inet->inet_num);
|
|
inet->inet_daddr = 0;
|
|
inet->inet_dport = 0;
|
|
sk_dst_reset(sk);
|
|
err = 0;
|
|
out_release_sock:
|
|
release_sock(sk);
|
|
out:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(inet_bind);
|
|
|
|
int inet_dgram_connect(struct socket *sock, struct sockaddr * uaddr,
|
|
int addr_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (addr_len < sizeof(uaddr->sa_family))
|
|
return -EINVAL;
|
|
if (uaddr->sa_family == AF_UNSPEC)
|
|
return sk->sk_prot->disconnect(sk, flags);
|
|
|
|
if (!inet_sk(sk)->inet_num && inet_autobind(sk))
|
|
return -EAGAIN;
|
|
return sk->sk_prot->connect(sk, (struct sockaddr *)uaddr, addr_len);
|
|
}
|
|
EXPORT_SYMBOL(inet_dgram_connect);
|
|
|
|
static long inet_wait_for_connect(struct sock *sk, long timeo)
|
|
{
|
|
DEFINE_WAIT(wait);
|
|
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
|
|
/* Basic assumption: if someone sets sk->sk_err, he _must_
|
|
* change state of the socket from TCP_SYN_*.
|
|
* Connect() does not allow to get error notifications
|
|
* without closing the socket.
|
|
*/
|
|
while ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
|
|
release_sock(sk);
|
|
timeo = schedule_timeout(timeo);
|
|
lock_sock(sk);
|
|
if (signal_pending(current) || !timeo)
|
|
break;
|
|
prepare_to_wait(sk_sleep(sk), &wait, TASK_INTERRUPTIBLE);
|
|
}
|
|
finish_wait(sk_sleep(sk), &wait);
|
|
return timeo;
|
|
}
|
|
|
|
/*
|
|
* Connect to a remote host. There is regrettably still a little
|
|
* TCP 'magic' in here.
|
|
*/
|
|
int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
|
|
int addr_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err;
|
|
long timeo;
|
|
|
|
if (addr_len < sizeof(uaddr->sa_family))
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
|
|
if (uaddr->sa_family == AF_UNSPEC) {
|
|
err = sk->sk_prot->disconnect(sk, flags);
|
|
sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
|
|
goto out;
|
|
}
|
|
|
|
switch (sock->state) {
|
|
default:
|
|
err = -EINVAL;
|
|
goto out;
|
|
case SS_CONNECTED:
|
|
err = -EISCONN;
|
|
goto out;
|
|
case SS_CONNECTING:
|
|
err = -EALREADY;
|
|
/* Fall out of switch with err, set for this state */
|
|
break;
|
|
case SS_UNCONNECTED:
|
|
err = -EISCONN;
|
|
if (sk->sk_state != TCP_CLOSE)
|
|
goto out;
|
|
|
|
err = sk->sk_prot->connect(sk, uaddr, addr_len);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
sock->state = SS_CONNECTING;
|
|
|
|
/* Just entered SS_CONNECTING state; the only
|
|
* difference is that return value in non-blocking
|
|
* case is EINPROGRESS, rather than EALREADY.
|
|
*/
|
|
err = -EINPROGRESS;
|
|
break;
|
|
}
|
|
|
|
timeo = sock_sndtimeo(sk, flags & O_NONBLOCK);
|
|
|
|
if ((1 << sk->sk_state) & (TCPF_SYN_SENT | TCPF_SYN_RECV)) {
|
|
/* Error code is set above */
|
|
if (!timeo || !inet_wait_for_connect(sk, timeo))
|
|
goto out;
|
|
|
|
err = sock_intr_errno(timeo);
|
|
if (signal_pending(current))
|
|
goto out;
|
|
}
|
|
|
|
/* Connection was closed by RST, timeout, ICMP error
|
|
* or another process disconnected us.
|
|
*/
|
|
if (sk->sk_state == TCP_CLOSE)
|
|
goto sock_error;
|
|
|
|
/* sk->sk_err may be not zero now, if RECVERR was ordered by user
|
|
* and error was received after socket entered established state.
|
|
* Hence, it is handled normally after connect() return successfully.
|
|
*/
|
|
|
|
sock->state = SS_CONNECTED;
|
|
err = 0;
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
|
|
sock_error:
|
|
err = sock_error(sk) ? : -ECONNABORTED;
|
|
sock->state = SS_UNCONNECTED;
|
|
if (sk->sk_prot->disconnect(sk, flags))
|
|
sock->state = SS_DISCONNECTING;
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL(inet_stream_connect);
|
|
|
|
/*
|
|
* Accept a pending connection. The TCP layer now gives BSD semantics.
|
|
*/
|
|
|
|
int inet_accept(struct socket *sock, struct socket *newsock, int flags)
|
|
{
|
|
struct sock *sk1 = sock->sk;
|
|
int err = -EINVAL;
|
|
struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err);
|
|
|
|
if (!sk2)
|
|
goto do_err;
|
|
|
|
lock_sock(sk2);
|
|
|
|
WARN_ON(!((1 << sk2->sk_state) &
|
|
(TCPF_ESTABLISHED | TCPF_CLOSE_WAIT | TCPF_CLOSE)));
|
|
|
|
sock_graft(sk2, newsock);
|
|
|
|
newsock->state = SS_CONNECTED;
|
|
err = 0;
|
|
release_sock(sk2);
|
|
do_err:
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(inet_accept);
|
|
|
|
|
|
/*
|
|
* This does both peername and sockname.
|
|
*/
|
|
int inet_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int *uaddr_len, int peer)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
DECLARE_SOCKADDR(struct sockaddr_in *, sin, uaddr);
|
|
|
|
sin->sin_family = AF_INET;
|
|
if (peer) {
|
|
if (!inet->inet_dport ||
|
|
(((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
|
|
peer == 1))
|
|
return -ENOTCONN;
|
|
sin->sin_port = inet->inet_dport;
|
|
sin->sin_addr.s_addr = inet->inet_daddr;
|
|
} else {
|
|
__be32 addr = inet->inet_rcv_saddr;
|
|
if (!addr)
|
|
addr = inet->inet_saddr;
|
|
sin->sin_port = inet->inet_sport;
|
|
sin->sin_addr.s_addr = addr;
|
|
}
|
|
memset(sin->sin_zero, 0, sizeof(sin->sin_zero));
|
|
*uaddr_len = sizeof(*sin);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(inet_getname);
|
|
|
|
int inet_sendmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
|
|
size_t size)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
sock_rps_record_flow(sk);
|
|
|
|
/* We may need to bind the socket. */
|
|
if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
|
|
inet_autobind(sk))
|
|
return -EAGAIN;
|
|
|
|
return sk->sk_prot->sendmsg(iocb, sk, msg, size);
|
|
}
|
|
EXPORT_SYMBOL(inet_sendmsg);
|
|
|
|
ssize_t inet_sendpage(struct socket *sock, struct page *page, int offset,
|
|
size_t size, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
sock_rps_record_flow(sk);
|
|
|
|
/* We may need to bind the socket. */
|
|
if (!inet_sk(sk)->inet_num && !sk->sk_prot->no_autobind &&
|
|
inet_autobind(sk))
|
|
return -EAGAIN;
|
|
|
|
if (sk->sk_prot->sendpage)
|
|
return sk->sk_prot->sendpage(sk, page, offset, size, flags);
|
|
return sock_no_sendpage(sock, page, offset, size, flags);
|
|
}
|
|
EXPORT_SYMBOL(inet_sendpage);
|
|
|
|
int inet_recvmsg(struct kiocb *iocb, struct socket *sock, struct msghdr *msg,
|
|
size_t size, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int addr_len = 0;
|
|
int err;
|
|
|
|
sock_rps_record_flow(sk);
|
|
|
|
err = sk->sk_prot->recvmsg(iocb, sk, msg, size, flags & MSG_DONTWAIT,
|
|
flags & ~MSG_DONTWAIT, &addr_len);
|
|
if (err >= 0)
|
|
msg->msg_namelen = addr_len;
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(inet_recvmsg);
|
|
|
|
int inet_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err = 0;
|
|
|
|
/* This should really check to make sure
|
|
* the socket is a TCP socket. (WHY AC...)
|
|
*/
|
|
how++; /* maps 0->1 has the advantage of making bit 1 rcvs and
|
|
1->2 bit 2 snds.
|
|
2->3 */
|
|
if ((how & ~SHUTDOWN_MASK) || !how) /* MAXINT->0 */
|
|
return -EINVAL;
|
|
|
|
lock_sock(sk);
|
|
if (sock->state == SS_CONNECTING) {
|
|
if ((1 << sk->sk_state) &
|
|
(TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
|
|
sock->state = SS_DISCONNECTING;
|
|
else
|
|
sock->state = SS_CONNECTED;
|
|
}
|
|
|
|
switch (sk->sk_state) {
|
|
case TCP_CLOSE:
|
|
err = -ENOTCONN;
|
|
/* Hack to wake up other listeners, who can poll for
|
|
POLLHUP, even on eg. unconnected UDP sockets -- RR */
|
|
default:
|
|
sk->sk_shutdown |= how;
|
|
if (sk->sk_prot->shutdown)
|
|
sk->sk_prot->shutdown(sk, how);
|
|
break;
|
|
|
|
/* Remaining two branches are temporary solution for missing
|
|
* close() in multithreaded environment. It is _not_ a good idea,
|
|
* but we have no choice until close() is repaired at VFS level.
|
|
*/
|
|
case TCP_LISTEN:
|
|
if (!(how & RCV_SHUTDOWN))
|
|
break;
|
|
/* Fall through */
|
|
case TCP_SYN_SENT:
|
|
err = sk->sk_prot->disconnect(sk, O_NONBLOCK);
|
|
sock->state = err ? SS_DISCONNECTING : SS_UNCONNECTED;
|
|
break;
|
|
}
|
|
|
|
/* Wake up anyone sleeping in poll. */
|
|
sk->sk_state_change(sk);
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(inet_shutdown);
|
|
|
|
/*
|
|
* ioctl() calls you can issue on an INET socket. Most of these are
|
|
* device configuration and stuff and very rarely used. Some ioctls
|
|
* pass on to the socket itself.
|
|
*
|
|
* NOTE: I like the idea of a module for the config stuff. ie ifconfig
|
|
* loads the devconfigure module does its configuring and unloads it.
|
|
* There's a good 20K of config code hanging around the kernel.
|
|
*/
|
|
|
|
int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err = 0;
|
|
struct net *net = sock_net(sk);
|
|
|
|
switch (cmd) {
|
|
case SIOCGSTAMP:
|
|
err = sock_get_timestamp(sk, (struct timeval __user *)arg);
|
|
break;
|
|
case SIOCGSTAMPNS:
|
|
err = sock_get_timestampns(sk, (struct timespec __user *)arg);
|
|
break;
|
|
case SIOCADDRT:
|
|
case SIOCDELRT:
|
|
case SIOCRTMSG:
|
|
err = ip_rt_ioctl(net, cmd, (void __user *)arg);
|
|
break;
|
|
case SIOCDARP:
|
|
case SIOCGARP:
|
|
case SIOCSARP:
|
|
err = arp_ioctl(net, cmd, (void __user *)arg);
|
|
break;
|
|
case SIOCGIFADDR:
|
|
case SIOCSIFADDR:
|
|
case SIOCGIFBRDADDR:
|
|
case SIOCSIFBRDADDR:
|
|
case SIOCGIFNETMASK:
|
|
case SIOCSIFNETMASK:
|
|
case SIOCGIFDSTADDR:
|
|
case SIOCSIFDSTADDR:
|
|
case SIOCSIFPFLAGS:
|
|
case SIOCGIFPFLAGS:
|
|
case SIOCSIFFLAGS:
|
|
err = devinet_ioctl(net, cmd, (void __user *)arg);
|
|
break;
|
|
default:
|
|
if (sk->sk_prot->ioctl)
|
|
err = sk->sk_prot->ioctl(sk, cmd, arg);
|
|
else
|
|
err = -ENOIOCTLCMD;
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(inet_ioctl);
|
|
|
|
const struct proto_ops inet_stream_ops = {
|
|
.family = PF_INET,
|
|
.owner = THIS_MODULE,
|
|
.release = inet_release,
|
|
.bind = inet_bind,
|
|
.connect = inet_stream_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = inet_accept,
|
|
.getname = inet_getname,
|
|
.poll = tcp_poll,
|
|
.ioctl = inet_ioctl,
|
|
.listen = inet_listen,
|
|
.shutdown = inet_shutdown,
|
|
.setsockopt = sock_common_setsockopt,
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet_sendmsg,
|
|
.recvmsg = inet_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = inet_sendpage,
|
|
.splice_read = tcp_splice_read,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
EXPORT_SYMBOL(inet_stream_ops);
|
|
|
|
const struct proto_ops inet_dgram_ops = {
|
|
.family = PF_INET,
|
|
.owner = THIS_MODULE,
|
|
.release = inet_release,
|
|
.bind = inet_bind,
|
|
.connect = inet_dgram_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = inet_getname,
|
|
.poll = udp_poll,
|
|
.ioctl = inet_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = inet_shutdown,
|
|
.setsockopt = sock_common_setsockopt,
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet_sendmsg,
|
|
.recvmsg = inet_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = inet_sendpage,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
EXPORT_SYMBOL(inet_dgram_ops);
|
|
|
|
/*
|
|
* For SOCK_RAW sockets; should be the same as inet_dgram_ops but without
|
|
* udp_poll
|
|
*/
|
|
static const struct proto_ops inet_sockraw_ops = {
|
|
.family = PF_INET,
|
|
.owner = THIS_MODULE,
|
|
.release = inet_release,
|
|
.bind = inet_bind,
|
|
.connect = inet_dgram_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = sock_no_accept,
|
|
.getname = inet_getname,
|
|
.poll = datagram_poll,
|
|
.ioctl = inet_ioctl,
|
|
.listen = sock_no_listen,
|
|
.shutdown = inet_shutdown,
|
|
.setsockopt = sock_common_setsockopt,
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet_sendmsg,
|
|
.recvmsg = inet_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = inet_sendpage,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
static const struct net_proto_family inet_family_ops = {
|
|
.family = PF_INET,
|
|
.create = inet_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
/* Upon startup we insert all the elements in inetsw_array[] into
|
|
* the linked list inetsw.
|
|
*/
|
|
static struct inet_protosw inetsw_array[] =
|
|
{
|
|
{
|
|
.type = SOCK_STREAM,
|
|
.protocol = IPPROTO_TCP,
|
|
.prot = &tcp_prot,
|
|
.ops = &inet_stream_ops,
|
|
.no_check = 0,
|
|
.flags = INET_PROTOSW_PERMANENT |
|
|
INET_PROTOSW_ICSK,
|
|
},
|
|
|
|
{
|
|
.type = SOCK_DGRAM,
|
|
.protocol = IPPROTO_UDP,
|
|
.prot = &udp_prot,
|
|
.ops = &inet_dgram_ops,
|
|
.no_check = UDP_CSUM_DEFAULT,
|
|
.flags = INET_PROTOSW_PERMANENT,
|
|
},
|
|
|
|
|
|
{
|
|
.type = SOCK_RAW,
|
|
.protocol = IPPROTO_IP, /* wild card */
|
|
.prot = &raw_prot,
|
|
.ops = &inet_sockraw_ops,
|
|
.no_check = UDP_CSUM_DEFAULT,
|
|
.flags = INET_PROTOSW_REUSE,
|
|
}
|
|
};
|
|
|
|
#define INETSW_ARRAY_LEN ARRAY_SIZE(inetsw_array)
|
|
|
|
void inet_register_protosw(struct inet_protosw *p)
|
|
{
|
|
struct list_head *lh;
|
|
struct inet_protosw *answer;
|
|
int protocol = p->protocol;
|
|
struct list_head *last_perm;
|
|
|
|
spin_lock_bh(&inetsw_lock);
|
|
|
|
if (p->type >= SOCK_MAX)
|
|
goto out_illegal;
|
|
|
|
/* If we are trying to override a permanent protocol, bail. */
|
|
answer = NULL;
|
|
last_perm = &inetsw[p->type];
|
|
list_for_each(lh, &inetsw[p->type]) {
|
|
answer = list_entry(lh, struct inet_protosw, list);
|
|
|
|
/* Check only the non-wild match. */
|
|
if (INET_PROTOSW_PERMANENT & answer->flags) {
|
|
if (protocol == answer->protocol)
|
|
break;
|
|
last_perm = lh;
|
|
}
|
|
|
|
answer = NULL;
|
|
}
|
|
if (answer)
|
|
goto out_permanent;
|
|
|
|
/* Add the new entry after the last permanent entry if any, so that
|
|
* the new entry does not override a permanent entry when matched with
|
|
* a wild-card protocol. But it is allowed to override any existing
|
|
* non-permanent entry. This means that when we remove this entry, the
|
|
* system automatically returns to the old behavior.
|
|
*/
|
|
list_add_rcu(&p->list, last_perm);
|
|
out:
|
|
spin_unlock_bh(&inetsw_lock);
|
|
|
|
return;
|
|
|
|
out_permanent:
|
|
printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
|
|
protocol);
|
|
goto out;
|
|
|
|
out_illegal:
|
|
printk(KERN_ERR
|
|
"Ignoring attempt to register invalid socket type %d.\n",
|
|
p->type);
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL(inet_register_protosw);
|
|
|
|
void inet_unregister_protosw(struct inet_protosw *p)
|
|
{
|
|
if (INET_PROTOSW_PERMANENT & p->flags) {
|
|
printk(KERN_ERR
|
|
"Attempt to unregister permanent protocol %d.\n",
|
|
p->protocol);
|
|
} else {
|
|
spin_lock_bh(&inetsw_lock);
|
|
list_del_rcu(&p->list);
|
|
spin_unlock_bh(&inetsw_lock);
|
|
|
|
synchronize_net();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(inet_unregister_protosw);
|
|
|
|
/*
|
|
* Shall we try to damage output packets if routing dev changes?
|
|
*/
|
|
|
|
int sysctl_ip_dynaddr __read_mostly;
|
|
|
|
static int inet_sk_reselect_saddr(struct sock *sk)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
int err;
|
|
struct rtable *rt;
|
|
__be32 old_saddr = inet->inet_saddr;
|
|
__be32 new_saddr;
|
|
__be32 daddr = inet->inet_daddr;
|
|
|
|
if (inet->opt && inet->opt->srr)
|
|
daddr = inet->opt->faddr;
|
|
|
|
/* Query new route. */
|
|
err = ip_route_connect(&rt, daddr, 0,
|
|
RT_CONN_FLAGS(sk),
|
|
sk->sk_bound_dev_if,
|
|
sk->sk_protocol,
|
|
inet->inet_sport, inet->inet_dport, sk, 0);
|
|
if (err)
|
|
return err;
|
|
|
|
sk_setup_caps(sk, &rt->dst);
|
|
|
|
new_saddr = rt->rt_src;
|
|
|
|
if (new_saddr == old_saddr)
|
|
return 0;
|
|
|
|
if (sysctl_ip_dynaddr > 1) {
|
|
printk(KERN_INFO "%s(): shifting inet->saddr from %pI4 to %pI4\n",
|
|
__func__, &old_saddr, &new_saddr);
|
|
}
|
|
|
|
inet->inet_saddr = inet->inet_rcv_saddr = new_saddr;
|
|
|
|
/*
|
|
* XXX The only one ugly spot where we need to
|
|
* XXX really change the sockets identity after
|
|
* XXX it has entered the hashes. -DaveM
|
|
*
|
|
* Besides that, it does not check for connection
|
|
* uniqueness. Wait for troubles.
|
|
*/
|
|
__sk_prot_rehash(sk);
|
|
return 0;
|
|
}
|
|
|
|
int inet_sk_rebuild_header(struct sock *sk)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct rtable *rt = (struct rtable *)__sk_dst_check(sk, 0);
|
|
__be32 daddr;
|
|
int err;
|
|
|
|
/* Route is OK, nothing to do. */
|
|
if (rt)
|
|
return 0;
|
|
|
|
/* Reroute. */
|
|
daddr = inet->inet_daddr;
|
|
if (inet->opt && inet->opt->srr)
|
|
daddr = inet->opt->faddr;
|
|
{
|
|
struct flowi fl = {
|
|
.oif = sk->sk_bound_dev_if,
|
|
.mark = sk->sk_mark,
|
|
.fl4_dst = daddr,
|
|
.fl4_src = inet->inet_saddr,
|
|
.fl4_tos = RT_CONN_FLAGS(sk),
|
|
.proto = sk->sk_protocol,
|
|
.flags = inet_sk_flowi_flags(sk),
|
|
.fl_ip_sport = inet->inet_sport,
|
|
.fl_ip_dport = inet->inet_dport,
|
|
};
|
|
|
|
security_sk_classify_flow(sk, &fl);
|
|
err = ip_route_output_flow(sock_net(sk), &rt, &fl, sk, 0);
|
|
}
|
|
if (!err)
|
|
sk_setup_caps(sk, &rt->dst);
|
|
else {
|
|
/* Routing failed... */
|
|
sk->sk_route_caps = 0;
|
|
/*
|
|
* Other protocols have to map its equivalent state to TCP_SYN_SENT.
|
|
* DCCP maps its DCCP_REQUESTING state to TCP_SYN_SENT. -acme
|
|
*/
|
|
if (!sysctl_ip_dynaddr ||
|
|
sk->sk_state != TCP_SYN_SENT ||
|
|
(sk->sk_userlocks & SOCK_BINDADDR_LOCK) ||
|
|
(err = inet_sk_reselect_saddr(sk)) != 0)
|
|
sk->sk_err_soft = -err;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(inet_sk_rebuild_header);
|
|
|
|
static int inet_gso_send_check(struct sk_buff *skb)
|
|
{
|
|
struct iphdr *iph;
|
|
const struct net_protocol *ops;
|
|
int proto;
|
|
int ihl;
|
|
int err = -EINVAL;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
|
|
goto out;
|
|
|
|
iph = ip_hdr(skb);
|
|
ihl = iph->ihl * 4;
|
|
if (ihl < sizeof(*iph))
|
|
goto out;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, ihl)))
|
|
goto out;
|
|
|
|
__skb_pull(skb, ihl);
|
|
skb_reset_transport_header(skb);
|
|
iph = ip_hdr(skb);
|
|
proto = iph->protocol & (MAX_INET_PROTOS - 1);
|
|
err = -EPROTONOSUPPORT;
|
|
|
|
rcu_read_lock();
|
|
ops = rcu_dereference(inet_protos[proto]);
|
|
if (likely(ops && ops->gso_send_check))
|
|
err = ops->gso_send_check(skb);
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
static struct sk_buff *inet_gso_segment(struct sk_buff *skb, int features)
|
|
{
|
|
struct sk_buff *segs = ERR_PTR(-EINVAL);
|
|
struct iphdr *iph;
|
|
const struct net_protocol *ops;
|
|
int proto;
|
|
int ihl;
|
|
int id;
|
|
unsigned int offset = 0;
|
|
|
|
if (!(features & NETIF_F_V4_CSUM))
|
|
features &= ~NETIF_F_SG;
|
|
|
|
if (unlikely(skb_shinfo(skb)->gso_type &
|
|
~(SKB_GSO_TCPV4 |
|
|
SKB_GSO_UDP |
|
|
SKB_GSO_DODGY |
|
|
SKB_GSO_TCP_ECN |
|
|
0)))
|
|
goto out;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
|
|
goto out;
|
|
|
|
iph = ip_hdr(skb);
|
|
ihl = iph->ihl * 4;
|
|
if (ihl < sizeof(*iph))
|
|
goto out;
|
|
|
|
if (unlikely(!pskb_may_pull(skb, ihl)))
|
|
goto out;
|
|
|
|
__skb_pull(skb, ihl);
|
|
skb_reset_transport_header(skb);
|
|
iph = ip_hdr(skb);
|
|
id = ntohs(iph->id);
|
|
proto = iph->protocol & (MAX_INET_PROTOS - 1);
|
|
segs = ERR_PTR(-EPROTONOSUPPORT);
|
|
|
|
rcu_read_lock();
|
|
ops = rcu_dereference(inet_protos[proto]);
|
|
if (likely(ops && ops->gso_segment))
|
|
segs = ops->gso_segment(skb, features);
|
|
rcu_read_unlock();
|
|
|
|
if (!segs || IS_ERR(segs))
|
|
goto out;
|
|
|
|
skb = segs;
|
|
do {
|
|
iph = ip_hdr(skb);
|
|
if (proto == IPPROTO_UDP) {
|
|
iph->id = htons(id);
|
|
iph->frag_off = htons(offset >> 3);
|
|
if (skb->next != NULL)
|
|
iph->frag_off |= htons(IP_MF);
|
|
offset += (skb->len - skb->mac_len - iph->ihl * 4);
|
|
} else
|
|
iph->id = htons(id++);
|
|
iph->tot_len = htons(skb->len - skb->mac_len);
|
|
iph->check = 0;
|
|
iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
|
|
} while ((skb = skb->next));
|
|
|
|
out:
|
|
return segs;
|
|
}
|
|
|
|
static struct sk_buff **inet_gro_receive(struct sk_buff **head,
|
|
struct sk_buff *skb)
|
|
{
|
|
const struct net_protocol *ops;
|
|
struct sk_buff **pp = NULL;
|
|
struct sk_buff *p;
|
|
struct iphdr *iph;
|
|
unsigned int hlen;
|
|
unsigned int off;
|
|
unsigned int id;
|
|
int flush = 1;
|
|
int proto;
|
|
|
|
off = skb_gro_offset(skb);
|
|
hlen = off + sizeof(*iph);
|
|
iph = skb_gro_header_fast(skb, off);
|
|
if (skb_gro_header_hard(skb, hlen)) {
|
|
iph = skb_gro_header_slow(skb, hlen, off);
|
|
if (unlikely(!iph))
|
|
goto out;
|
|
}
|
|
|
|
proto = iph->protocol & (MAX_INET_PROTOS - 1);
|
|
|
|
rcu_read_lock();
|
|
ops = rcu_dereference(inet_protos[proto]);
|
|
if (!ops || !ops->gro_receive)
|
|
goto out_unlock;
|
|
|
|
if (*(u8 *)iph != 0x45)
|
|
goto out_unlock;
|
|
|
|
if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
|
|
goto out_unlock;
|
|
|
|
id = ntohl(*(__be32 *)&iph->id);
|
|
flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id ^ IP_DF));
|
|
id >>= 16;
|
|
|
|
for (p = *head; p; p = p->next) {
|
|
struct iphdr *iph2;
|
|
|
|
if (!NAPI_GRO_CB(p)->same_flow)
|
|
continue;
|
|
|
|
iph2 = ip_hdr(p);
|
|
|
|
if ((iph->protocol ^ iph2->protocol) |
|
|
(iph->tos ^ iph2->tos) |
|
|
((__force u32)iph->saddr ^ (__force u32)iph2->saddr) |
|
|
((__force u32)iph->daddr ^ (__force u32)iph2->daddr)) {
|
|
NAPI_GRO_CB(p)->same_flow = 0;
|
|
continue;
|
|
}
|
|
|
|
/* All fields must match except length and checksum. */
|
|
NAPI_GRO_CB(p)->flush |=
|
|
(iph->ttl ^ iph2->ttl) |
|
|
((u16)(ntohs(iph2->id) + NAPI_GRO_CB(p)->count) ^ id);
|
|
|
|
NAPI_GRO_CB(p)->flush |= flush;
|
|
}
|
|
|
|
NAPI_GRO_CB(skb)->flush |= flush;
|
|
skb_gro_pull(skb, sizeof(*iph));
|
|
skb_set_transport_header(skb, skb_gro_offset(skb));
|
|
|
|
pp = ops->gro_receive(head, skb);
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
NAPI_GRO_CB(skb)->flush |= flush;
|
|
|
|
return pp;
|
|
}
|
|
|
|
static int inet_gro_complete(struct sk_buff *skb)
|
|
{
|
|
const struct net_protocol *ops;
|
|
struct iphdr *iph = ip_hdr(skb);
|
|
int proto = iph->protocol & (MAX_INET_PROTOS - 1);
|
|
int err = -ENOSYS;
|
|
__be16 newlen = htons(skb->len - skb_network_offset(skb));
|
|
|
|
csum_replace2(&iph->check, iph->tot_len, newlen);
|
|
iph->tot_len = newlen;
|
|
|
|
rcu_read_lock();
|
|
ops = rcu_dereference(inet_protos[proto]);
|
|
if (WARN_ON(!ops || !ops->gro_complete))
|
|
goto out_unlock;
|
|
|
|
err = ops->gro_complete(skb);
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
int inet_ctl_sock_create(struct sock **sk, unsigned short family,
|
|
unsigned short type, unsigned char protocol,
|
|
struct net *net)
|
|
{
|
|
struct socket *sock;
|
|
int rc = sock_create_kern(family, type, protocol, &sock);
|
|
|
|
if (rc == 0) {
|
|
*sk = sock->sk;
|
|
(*sk)->sk_allocation = GFP_ATOMIC;
|
|
/*
|
|
* Unhash it so that IP input processing does not even see it,
|
|
* we do not wish this socket to see incoming packets.
|
|
*/
|
|
(*sk)->sk_prot->unhash(*sk);
|
|
|
|
sk_change_net(*sk, net);
|
|
}
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
|
|
|
|
unsigned long snmp_fold_field(void __percpu *mib[], int offt)
|
|
{
|
|
unsigned long res = 0;
|
|
int i;
|
|
|
|
for_each_possible_cpu(i) {
|
|
res += *(((unsigned long *) per_cpu_ptr(mib[0], i)) + offt);
|
|
res += *(((unsigned long *) per_cpu_ptr(mib[1], i)) + offt);
|
|
}
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snmp_fold_field);
|
|
|
|
#if BITS_PER_LONG==32
|
|
|
|
u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp_offset)
|
|
{
|
|
u64 res = 0;
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
void *bhptr, *userptr;
|
|
struct u64_stats_sync *syncp;
|
|
u64 v_bh, v_user;
|
|
unsigned int start;
|
|
|
|
/* first mib used by softirq context, we must use _bh() accessors */
|
|
bhptr = per_cpu_ptr(SNMP_STAT_BHPTR(mib), cpu);
|
|
syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
|
|
do {
|
|
start = u64_stats_fetch_begin_bh(syncp);
|
|
v_bh = *(((u64 *) bhptr) + offt);
|
|
} while (u64_stats_fetch_retry_bh(syncp, start));
|
|
|
|
/* second mib used in USER context */
|
|
userptr = per_cpu_ptr(SNMP_STAT_USRPTR(mib), cpu);
|
|
syncp = (struct u64_stats_sync *)(userptr + syncp_offset);
|
|
do {
|
|
start = u64_stats_fetch_begin(syncp);
|
|
v_user = *(((u64 *) userptr) + offt);
|
|
} while (u64_stats_fetch_retry(syncp, start));
|
|
|
|
res += v_bh + v_user;
|
|
}
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snmp_fold_field64);
|
|
#endif
|
|
|
|
int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align)
|
|
{
|
|
BUG_ON(ptr == NULL);
|
|
ptr[0] = __alloc_percpu(mibsize, align);
|
|
if (!ptr[0])
|
|
goto err0;
|
|
ptr[1] = __alloc_percpu(mibsize, align);
|
|
if (!ptr[1])
|
|
goto err1;
|
|
return 0;
|
|
err1:
|
|
free_percpu(ptr[0]);
|
|
ptr[0] = NULL;
|
|
err0:
|
|
return -ENOMEM;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snmp_mib_init);
|
|
|
|
void snmp_mib_free(void __percpu *ptr[2])
|
|
{
|
|
BUG_ON(ptr == NULL);
|
|
free_percpu(ptr[0]);
|
|
free_percpu(ptr[1]);
|
|
ptr[0] = ptr[1] = NULL;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snmp_mib_free);
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
static const struct net_protocol igmp_protocol = {
|
|
.handler = igmp_rcv,
|
|
.netns_ok = 1,
|
|
};
|
|
#endif
|
|
|
|
static const struct net_protocol tcp_protocol = {
|
|
.handler = tcp_v4_rcv,
|
|
.err_handler = tcp_v4_err,
|
|
.gso_send_check = tcp_v4_gso_send_check,
|
|
.gso_segment = tcp_tso_segment,
|
|
.gro_receive = tcp4_gro_receive,
|
|
.gro_complete = tcp4_gro_complete,
|
|
.no_policy = 1,
|
|
.netns_ok = 1,
|
|
};
|
|
|
|
static const struct net_protocol udp_protocol = {
|
|
.handler = udp_rcv,
|
|
.err_handler = udp_err,
|
|
.gso_send_check = udp4_ufo_send_check,
|
|
.gso_segment = udp4_ufo_fragment,
|
|
.no_policy = 1,
|
|
.netns_ok = 1,
|
|
};
|
|
|
|
static const struct net_protocol icmp_protocol = {
|
|
.handler = icmp_rcv,
|
|
.no_policy = 1,
|
|
.netns_ok = 1,
|
|
};
|
|
|
|
static __net_init int ipv4_mib_init_net(struct net *net)
|
|
{
|
|
if (snmp_mib_init((void __percpu **)net->mib.tcp_statistics,
|
|
sizeof(struct tcp_mib),
|
|
__alignof__(struct tcp_mib)) < 0)
|
|
goto err_tcp_mib;
|
|
if (snmp_mib_init((void __percpu **)net->mib.ip_statistics,
|
|
sizeof(struct ipstats_mib),
|
|
__alignof__(struct ipstats_mib)) < 0)
|
|
goto err_ip_mib;
|
|
if (snmp_mib_init((void __percpu **)net->mib.net_statistics,
|
|
sizeof(struct linux_mib),
|
|
__alignof__(struct linux_mib)) < 0)
|
|
goto err_net_mib;
|
|
if (snmp_mib_init((void __percpu **)net->mib.udp_statistics,
|
|
sizeof(struct udp_mib),
|
|
__alignof__(struct udp_mib)) < 0)
|
|
goto err_udp_mib;
|
|
if (snmp_mib_init((void __percpu **)net->mib.udplite_statistics,
|
|
sizeof(struct udp_mib),
|
|
__alignof__(struct udp_mib)) < 0)
|
|
goto err_udplite_mib;
|
|
if (snmp_mib_init((void __percpu **)net->mib.icmp_statistics,
|
|
sizeof(struct icmp_mib),
|
|
__alignof__(struct icmp_mib)) < 0)
|
|
goto err_icmp_mib;
|
|
if (snmp_mib_init((void __percpu **)net->mib.icmpmsg_statistics,
|
|
sizeof(struct icmpmsg_mib),
|
|
__alignof__(struct icmpmsg_mib)) < 0)
|
|
goto err_icmpmsg_mib;
|
|
|
|
tcp_mib_init(net);
|
|
return 0;
|
|
|
|
err_icmpmsg_mib:
|
|
snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
|
|
err_icmp_mib:
|
|
snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
|
|
err_udplite_mib:
|
|
snmp_mib_free((void __percpu **)net->mib.udp_statistics);
|
|
err_udp_mib:
|
|
snmp_mib_free((void __percpu **)net->mib.net_statistics);
|
|
err_net_mib:
|
|
snmp_mib_free((void __percpu **)net->mib.ip_statistics);
|
|
err_ip_mib:
|
|
snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
|
|
err_tcp_mib:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static __net_exit void ipv4_mib_exit_net(struct net *net)
|
|
{
|
|
snmp_mib_free((void __percpu **)net->mib.icmpmsg_statistics);
|
|
snmp_mib_free((void __percpu **)net->mib.icmp_statistics);
|
|
snmp_mib_free((void __percpu **)net->mib.udplite_statistics);
|
|
snmp_mib_free((void __percpu **)net->mib.udp_statistics);
|
|
snmp_mib_free((void __percpu **)net->mib.net_statistics);
|
|
snmp_mib_free((void __percpu **)net->mib.ip_statistics);
|
|
snmp_mib_free((void __percpu **)net->mib.tcp_statistics);
|
|
}
|
|
|
|
static __net_initdata struct pernet_operations ipv4_mib_ops = {
|
|
.init = ipv4_mib_init_net,
|
|
.exit = ipv4_mib_exit_net,
|
|
};
|
|
|
|
static int __init init_ipv4_mibs(void)
|
|
{
|
|
return register_pernet_subsys(&ipv4_mib_ops);
|
|
}
|
|
|
|
static int ipv4_proc_init(void);
|
|
|
|
/*
|
|
* IP protocol layer initialiser
|
|
*/
|
|
|
|
static struct packet_type ip_packet_type __read_mostly = {
|
|
.type = cpu_to_be16(ETH_P_IP),
|
|
.func = ip_rcv,
|
|
.gso_send_check = inet_gso_send_check,
|
|
.gso_segment = inet_gso_segment,
|
|
.gro_receive = inet_gro_receive,
|
|
.gro_complete = inet_gro_complete,
|
|
};
|
|
|
|
static int __init inet_init(void)
|
|
{
|
|
struct sk_buff *dummy_skb;
|
|
struct inet_protosw *q;
|
|
struct list_head *r;
|
|
int rc = -EINVAL;
|
|
|
|
BUILD_BUG_ON(sizeof(struct inet_skb_parm) > sizeof(dummy_skb->cb));
|
|
|
|
sysctl_local_reserved_ports = kzalloc(65536 / 8, GFP_KERNEL);
|
|
if (!sysctl_local_reserved_ports)
|
|
goto out;
|
|
|
|
rc = proto_register(&tcp_prot, 1);
|
|
if (rc)
|
|
goto out_free_reserved_ports;
|
|
|
|
rc = proto_register(&udp_prot, 1);
|
|
if (rc)
|
|
goto out_unregister_tcp_proto;
|
|
|
|
rc = proto_register(&raw_prot, 1);
|
|
if (rc)
|
|
goto out_unregister_udp_proto;
|
|
|
|
/*
|
|
* Tell SOCKET that we are alive...
|
|
*/
|
|
|
|
(void)sock_register(&inet_family_ops);
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
ip_static_sysctl_init();
|
|
#endif
|
|
|
|
/*
|
|
* Add all the base protocols.
|
|
*/
|
|
|
|
if (inet_add_protocol(&icmp_protocol, IPPROTO_ICMP) < 0)
|
|
printk(KERN_CRIT "inet_init: Cannot add ICMP protocol\n");
|
|
if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
|
|
printk(KERN_CRIT "inet_init: Cannot add UDP protocol\n");
|
|
if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
|
|
printk(KERN_CRIT "inet_init: Cannot add TCP protocol\n");
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
|
|
printk(KERN_CRIT "inet_init: Cannot add IGMP protocol\n");
|
|
#endif
|
|
|
|
/* Register the socket-side information for inet_create. */
|
|
for (r = &inetsw[0]; r < &inetsw[SOCK_MAX]; ++r)
|
|
INIT_LIST_HEAD(r);
|
|
|
|
for (q = inetsw_array; q < &inetsw_array[INETSW_ARRAY_LEN]; ++q)
|
|
inet_register_protosw(q);
|
|
|
|
/*
|
|
* Set the ARP module up
|
|
*/
|
|
|
|
arp_init();
|
|
|
|
/*
|
|
* Set the IP module up
|
|
*/
|
|
|
|
ip_init();
|
|
|
|
tcp_v4_init();
|
|
|
|
/* Setup TCP slab cache for open requests. */
|
|
tcp_init();
|
|
|
|
/* Setup UDP memory threshold */
|
|
udp_init();
|
|
|
|
/* Add UDP-Lite (RFC 3828) */
|
|
udplite4_register();
|
|
|
|
/*
|
|
* Set the ICMP layer up
|
|
*/
|
|
|
|
if (icmp_init() < 0)
|
|
panic("Failed to create the ICMP control socket.\n");
|
|
|
|
/*
|
|
* Initialise the multicast router
|
|
*/
|
|
#if defined(CONFIG_IP_MROUTE)
|
|
if (ip_mr_init())
|
|
printk(KERN_CRIT "inet_init: Cannot init ipv4 mroute\n");
|
|
#endif
|
|
/*
|
|
* Initialise per-cpu ipv4 mibs
|
|
*/
|
|
|
|
if (init_ipv4_mibs())
|
|
printk(KERN_CRIT "inet_init: Cannot init ipv4 mibs\n");
|
|
|
|
ipv4_proc_init();
|
|
|
|
ipfrag_init();
|
|
|
|
dev_add_pack(&ip_packet_type);
|
|
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
out_unregister_udp_proto:
|
|
proto_unregister(&udp_prot);
|
|
out_unregister_tcp_proto:
|
|
proto_unregister(&tcp_prot);
|
|
out_free_reserved_ports:
|
|
kfree(sysctl_local_reserved_ports);
|
|
goto out;
|
|
}
|
|
|
|
fs_initcall(inet_init);
|
|
|
|
/* ------------------------------------------------------------------------ */
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
static int __init ipv4_proc_init(void)
|
|
{
|
|
int rc = 0;
|
|
|
|
if (raw_proc_init())
|
|
goto out_raw;
|
|
if (tcp4_proc_init())
|
|
goto out_tcp;
|
|
if (udp4_proc_init())
|
|
goto out_udp;
|
|
if (ip_misc_proc_init())
|
|
goto out_misc;
|
|
out:
|
|
return rc;
|
|
out_misc:
|
|
udp4_proc_exit();
|
|
out_udp:
|
|
tcp4_proc_exit();
|
|
out_tcp:
|
|
raw_proc_exit();
|
|
out_raw:
|
|
rc = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
#else /* CONFIG_PROC_FS */
|
|
static int __init ipv4_proc_init(void)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif /* CONFIG_PROC_FS */
|
|
|
|
MODULE_ALIAS_NETPROTO(PF_INET);
|
|
|