![Arnd Bergmann](/assets/img/avatar_default.png)
The SIOCGSTAMP/SIOCGSTAMPNS ioctl commands are implemented by many socket protocol handlers, and all of those end up calling the same sock_get_timestamp()/sock_get_timestampns() helper functions, which results in a lot of duplicate code. With the introduction of 64-bit time_t on 32-bit architectures, this gets worse, as we then need four different ioctl commands in each socket protocol implementation. To simplify that, let's add a new .gettstamp() operation in struct proto_ops, and move ioctl implementation into the common sock_ioctl()/compat_sock_ioctl_trans() functions that these all go through. We can reuse the sock_get_timestamp() implementation, but generalize it so it can deal with both native and compat mode, as well as timeval and timespec structures. Acked-by: Stefan Schmidt <stefan@datenfreihafen.org> Acked-by: Neil Horman <nhorman@tuxdriver.com> Acked-by: Marc Kleine-Budde <mkl@pengutronix.de> Link: https://lore.kernel.org/lkml/CAK8P3a038aDQQotzua_QtKGhq8O9n+rdiz2=WDCp82ys8eUT+A@mail.gmail.com/ Signed-off-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Willem de Bruijn <willemb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2074 lines
51 KiB
C
2074 lines
51 KiB
C
/*
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
* operating system. INET is implemented using the BSD Socket
|
|
* interface as the means of communication with the user level.
|
|
*
|
|
* PF_INET protocol family socket handler.
|
|
*
|
|
* Authors: Ross Biro
|
|
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
|
|
* Florian La Roche, <flla@stud.uni-sb.de>
|
|
* Alan Cox, <A.Cox@swansea.ac.uk>
|
|
*
|
|
* Changes (see also sock.c)
|
|
*
|
|
* piggy,
|
|
* Karl Knutson : Socket protocol table
|
|
* A.N.Kuznetsov : Socket death error in accept().
|
|
* John Richardson : Fix non blocking error in connect()
|
|
* so sockets that fail to connect
|
|
* don't return -EINPROGRESS.
|
|
* Alan Cox : Asynchronous I/O support
|
|
* Alan Cox : Keep correct socket pointer on sock
|
|
* structures
|
|
* when accept() ed
|
|
* Alan Cox : Semantics of SO_LINGER aren't state
|
|
* moved to close when you look carefully.
|
|
* With this fixed and the accept bug fixed
|
|
* some RPC stuff seems happier.
|
|
* Niibe Yutaka : 4.4BSD style write async I/O
|
|
* Alan Cox,
|
|
* Tony Gale : Fixed reuse semantics.
|
|
* Alan Cox : bind() shouldn't abort existing but dead
|
|
* sockets. Stops FTP netin:.. I hope.
|
|
* Alan Cox : bind() works correctly for RAW sockets.
|
|
* Note that FreeBSD at least was broken
|
|
* in this respect so be careful with
|
|
* compatibility tests...
|
|
* Alan Cox : routing cache support
|
|
* Alan Cox : memzero the socket structure for
|
|
* compactness.
|
|
* Matt Day : nonblock connect error handler
|
|
* Alan Cox : Allow large numbers of pending sockets
|
|
* (eg for big web sites), but only if
|
|
* specifically application requested.
|
|
* Alan Cox : New buffering throughout IP. Used
|
|
* dumbly.
|
|
* Alan Cox : New buffering now used smartly.
|
|
* Alan Cox : BSD rather than common sense
|
|
* interpretation of listen.
|
|
* Germano Caronni : Assorted small races.
|
|
* Alan Cox : sendmsg/recvmsg basic support.
|
|
* Alan Cox : Only sendmsg/recvmsg now supported.
|
|
* Alan Cox : Locked down bind (see security list).
|
|
* Alan Cox : Loosened bind a little.
|
|
* Mike McLagan : ADD/DEL DLCI Ioctls
|
|
* Willy Konynenberg : Transparent proxying support.
|
|
* David S. Miller : New socket lookup architecture.
|
|
* Some other random speedups.
|
|
* Cyrus Durgin : Cleaned up file for kmod hacks.
|
|
* Andi Kleen : Fix inet_stream_connect TCP race.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "IPv4: " fmt
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/types.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/in.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/kmod.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/string.h>
|
|
#include <linux/sockios.h>
|
|
#include <linux/net.h>
|
|
#include <linux/capability.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/stat.h>
|
|
#include <linux/init.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/netfilter_ipv4.h>
|
|
#include <linux/random.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include <linux/uaccess.h>
|
|
|
|
#include <linux/inet.h>
|
|
#include <linux/igmp.h>
|
|
#include <linux/inetdevice.h>
|
|
#include <linux/netdevice.h>
|
|
#include <net/checksum.h>
|
|
#include <net/ip.h>
|
|
#include <net/protocol.h>
|
|
#include <net/arp.h>
|
|
#include <net/route.h>
|
|
#include <net/ip_fib.h>
|
|
#include <net/inet_connection_sock.h>
|
|
#include <net/tcp.h>
|
|
#include <net/udp.h>
|
|
#include <net/udplite.h>
|
|
#include <net/ping.h>
|
|
#include <linux/skbuff.h>
|
|
#include <net/sock.h>
|
|
#include <net/raw.h>
|
|
#include <net/icmp.h>
|
|
#include <net/inet_common.h>
|
|
#include <net/ip_tunnels.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/net_namespace.h>
|
|
#include <net/secure_seq.h>
|
|
#ifdef CONFIG_IP_MROUTE
|
|
#include <linux/mroute.h>
|
|
#endif
|
|
#include <net/l3mdev.h>
|
|
|
|
#include <trace/events/sock.h>
|
|
|
|
/* The inetsw table contains everything that inet_create needs to
|
|
* build a new socket.
|
|
*/
|
|
static struct list_head inetsw[SOCK_MAX];
|
|
static DEFINE_SPINLOCK(inetsw_lock);
|
|
|
|
/* New destruction routine */
|
|
|
|
void inet_sock_destruct(struct sock *sk)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
__skb_queue_purge(&sk->sk_receive_queue);
|
|
if (sk->sk_rx_skb_cache) {
|
|
__kfree_skb(sk->sk_rx_skb_cache);
|
|
sk->sk_rx_skb_cache = NULL;
|
|
}
|
|
__skb_queue_purge(&sk->sk_error_queue);
|
|
|
|
sk_mem_reclaim(sk);
|
|
|
|
if (sk->sk_type == SOCK_STREAM && sk->sk_state != TCP_CLOSE) {
|
|
pr_err("Attempt to release TCP socket in state %d %p\n",
|
|
sk->sk_state, sk);
|
|
return;
|
|
}
|
|
if (!sock_flag(sk, SOCK_DEAD)) {
|
|
pr_err("Attempt to release alive inet socket %p\n", sk);
|
|
return;
|
|
}
|
|
|
|
WARN_ON(atomic_read(&sk->sk_rmem_alloc));
|
|
WARN_ON(refcount_read(&sk->sk_wmem_alloc));
|
|
WARN_ON(sk->sk_wmem_queued);
|
|
WARN_ON(sk->sk_forward_alloc);
|
|
|
|
kfree(rcu_dereference_protected(inet->inet_opt, 1));
|
|
dst_release(rcu_dereference_protected(sk->sk_dst_cache, 1));
|
|
dst_release(sk->sk_rx_dst);
|
|
sk_refcnt_debug_dec(sk);
|
|
}
|
|
EXPORT_SYMBOL(inet_sock_destruct);
|
|
|
|
/*
|
|
* The routines beyond this point handle the behaviour of an AF_INET
|
|
* socket object. Mostly it punts to the subprotocols of IP to do
|
|
* the work.
|
|
*/
|
|
|
|
/*
|
|
* Automatically bind an unbound socket.
|
|
*/
|
|
|
|
static int inet_autobind(struct sock *sk)
|
|
{
|
|
struct inet_sock *inet;
|
|
/* We may need to bind the socket. */
|
|
lock_sock(sk);
|
|
inet = inet_sk(sk);
|
|
if (!inet->inet_num) {
|
|
if (sk->sk_prot->get_port(sk, 0)) {
|
|
release_sock(sk);
|
|
return -EAGAIN;
|
|
}
|
|
inet->inet_sport = htons(inet->inet_num);
|
|
}
|
|
release_sock(sk);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Move a socket into listening state.
|
|
*/
|
|
int inet_listen(struct socket *sock, int backlog)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
unsigned char old_state;
|
|
int err, tcp_fastopen;
|
|
|
|
lock_sock(sk);
|
|
|
|
err = -EINVAL;
|
|
if (sock->state != SS_UNCONNECTED || sock->type != SOCK_STREAM)
|
|
goto out;
|
|
|
|
old_state = sk->sk_state;
|
|
if (!((1 << old_state) & (TCPF_CLOSE | TCPF_LISTEN)))
|
|
goto out;
|
|
|
|
sk->sk_max_ack_backlog = backlog;
|
|
/* Really, if the socket is already in listen state
|
|
* we can only allow the backlog to be adjusted.
|
|
*/
|
|
if (old_state != TCP_LISTEN) {
|
|
/* Enable TFO w/o requiring TCP_FASTOPEN socket option.
|
|
* Note that only TCP sockets (SOCK_STREAM) will reach here.
|
|
* Also fastopen backlog may already been set via the option
|
|
* because the socket was in TCP_LISTEN state previously but
|
|
* was shutdown() rather than close().
|
|
*/
|
|
tcp_fastopen = sock_net(sk)->ipv4.sysctl_tcp_fastopen;
|
|
if ((tcp_fastopen & TFO_SERVER_WO_SOCKOPT1) &&
|
|
(tcp_fastopen & TFO_SERVER_ENABLE) &&
|
|
!inet_csk(sk)->icsk_accept_queue.fastopenq.max_qlen) {
|
|
fastopen_queue_tune(sk, backlog);
|
|
tcp_fastopen_init_key_once(sock_net(sk));
|
|
}
|
|
|
|
err = inet_csk_listen_start(sk, backlog);
|
|
if (err)
|
|
goto out;
|
|
tcp_call_bpf(sk, BPF_SOCK_OPS_TCP_LISTEN_CB, 0, NULL);
|
|
}
|
|
err = 0;
|
|
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(inet_listen);
|
|
|
|
/*
|
|
* Create an inet socket.
|
|
*/
|
|
|
|
static int inet_create(struct net *net, struct socket *sock, int protocol,
|
|
int kern)
|
|
{
|
|
struct sock *sk;
|
|
struct inet_protosw *answer;
|
|
struct inet_sock *inet;
|
|
struct proto *answer_prot;
|
|
unsigned char answer_flags;
|
|
int try_loading_module = 0;
|
|
int err;
|
|
|
|
if (protocol < 0 || protocol >= IPPROTO_MAX)
|
|
return -EINVAL;
|
|
|
|
sock->state = SS_UNCONNECTED;
|
|
|
|
/* Look for the requested type/protocol pair. */
|
|
lookup_protocol:
|
|
err = -ESOCKTNOSUPPORT;
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(answer, &inetsw[sock->type], list) {
|
|
|
|
err = 0;
|
|
/* Check the non-wild match. */
|
|
if (protocol == answer->protocol) {
|
|
if (protocol != IPPROTO_IP)
|
|
break;
|
|
} else {
|
|
/* Check for the two wild cases. */
|
|
if (IPPROTO_IP == protocol) {
|
|
protocol = answer->protocol;
|
|
break;
|
|
}
|
|
if (IPPROTO_IP == answer->protocol)
|
|
break;
|
|
}
|
|
err = -EPROTONOSUPPORT;
|
|
}
|
|
|
|
if (unlikely(err)) {
|
|
if (try_loading_module < 2) {
|
|
rcu_read_unlock();
|
|
/*
|
|
* Be more specific, e.g. net-pf-2-proto-132-type-1
|
|
* (net-pf-PF_INET-proto-IPPROTO_SCTP-type-SOCK_STREAM)
|
|
*/
|
|
if (++try_loading_module == 1)
|
|
request_module("net-pf-%d-proto-%d-type-%d",
|
|
PF_INET, protocol, sock->type);
|
|
/*
|
|
* Fall back to generic, e.g. net-pf-2-proto-132
|
|
* (net-pf-PF_INET-proto-IPPROTO_SCTP)
|
|
*/
|
|
else
|
|
request_module("net-pf-%d-proto-%d",
|
|
PF_INET, protocol);
|
|
goto lookup_protocol;
|
|
} else
|
|
goto out_rcu_unlock;
|
|
}
|
|
|
|
err = -EPERM;
|
|
if (sock->type == SOCK_RAW && !kern &&
|
|
!ns_capable(net->user_ns, CAP_NET_RAW))
|
|
goto out_rcu_unlock;
|
|
|
|
sock->ops = answer->ops;
|
|
answer_prot = answer->prot;
|
|
answer_flags = answer->flags;
|
|
rcu_read_unlock();
|
|
|
|
WARN_ON(!answer_prot->slab);
|
|
|
|
err = -ENOBUFS;
|
|
sk = sk_alloc(net, PF_INET, GFP_KERNEL, answer_prot, kern);
|
|
if (!sk)
|
|
goto out;
|
|
|
|
err = 0;
|
|
if (INET_PROTOSW_REUSE & answer_flags)
|
|
sk->sk_reuse = SK_CAN_REUSE;
|
|
|
|
inet = inet_sk(sk);
|
|
inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
|
|
|
|
inet->nodefrag = 0;
|
|
|
|
if (SOCK_RAW == sock->type) {
|
|
inet->inet_num = protocol;
|
|
if (IPPROTO_RAW == protocol)
|
|
inet->hdrincl = 1;
|
|
}
|
|
|
|
if (net->ipv4.sysctl_ip_no_pmtu_disc)
|
|
inet->pmtudisc = IP_PMTUDISC_DONT;
|
|
else
|
|
inet->pmtudisc = IP_PMTUDISC_WANT;
|
|
|
|
inet->inet_id = 0;
|
|
|
|
sock_init_data(sock, sk);
|
|
|
|
sk->sk_destruct = inet_sock_destruct;
|
|
sk->sk_protocol = protocol;
|
|
sk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
|
|
|
|
inet->uc_ttl = -1;
|
|
inet->mc_loop = 1;
|
|
inet->mc_ttl = 1;
|
|
inet->mc_all = 1;
|
|
inet->mc_index = 0;
|
|
inet->mc_list = NULL;
|
|
inet->rcv_tos = 0;
|
|
|
|
sk_refcnt_debug_inc(sk);
|
|
|
|
if (inet->inet_num) {
|
|
/* It assumes that any protocol which allows
|
|
* the user to assign a number at socket
|
|
* creation time automatically
|
|
* shares.
|
|
*/
|
|
inet->inet_sport = htons(inet->inet_num);
|
|
/* Add to protocol hash chains. */
|
|
err = sk->sk_prot->hash(sk);
|
|
if (err) {
|
|
sk_common_release(sk);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (sk->sk_prot->init) {
|
|
err = sk->sk_prot->init(sk);
|
|
if (err) {
|
|
sk_common_release(sk);
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
if (!kern) {
|
|
err = BPF_CGROUP_RUN_PROG_INET_SOCK(sk);
|
|
if (err) {
|
|
sk_common_release(sk);
|
|
goto out;
|
|
}
|
|
}
|
|
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;
|
|
|
|
/* 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);
|
|
|
|
int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err;
|
|
|
|
/* If the socket has its own bind function then use it. (RAW) */
|
|
if (sk->sk_prot->bind) {
|
|
return sk->sk_prot->bind(sk, uaddr, addr_len);
|
|
}
|
|
if (addr_len < sizeof(struct sockaddr_in))
|
|
return -EINVAL;
|
|
|
|
/* BPF prog is run before any checks are done so that if the prog
|
|
* changes context in a wrong way it will be caught.
|
|
*/
|
|
err = BPF_CGROUP_RUN_PROG_INET4_BIND(sk, uaddr);
|
|
if (err)
|
|
return err;
|
|
|
|
return __inet_bind(sk, uaddr, addr_len, false, true);
|
|
}
|
|
EXPORT_SYMBOL(inet_bind);
|
|
|
|
int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len,
|
|
bool force_bind_address_no_port, bool with_lock)
|
|
{
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)uaddr;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct net *net = sock_net(sk);
|
|
unsigned short snum;
|
|
int chk_addr_ret;
|
|
u32 tb_id = RT_TABLE_LOCAL;
|
|
int err;
|
|
|
|
if (addr->sin_family != AF_INET) {
|
|
/* Compatibility games : accept AF_UNSPEC (mapped to AF_INET)
|
|
* only if s_addr is INADDR_ANY.
|
|
*/
|
|
err = -EAFNOSUPPORT;
|
|
if (addr->sin_family != AF_UNSPEC ||
|
|
addr->sin_addr.s_addr != htonl(INADDR_ANY))
|
|
goto out;
|
|
}
|
|
|
|
tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
|
|
chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
|
|
|
|
/* 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 (!inet_can_nonlocal_bind(net, inet) &&
|
|
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 < inet_prot_sock(net) &&
|
|
!ns_capable(net->user_ns, 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.
|
|
*/
|
|
if (with_lock)
|
|
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 (snum || !(inet->bind_address_no_port ||
|
|
force_bind_address_no_port)) {
|
|
if (sk->sk_prot->get_port(sk, snum)) {
|
|
inet->inet_saddr = inet->inet_rcv_saddr = 0;
|
|
err = -EADDRINUSE;
|
|
goto out_release_sock;
|
|
}
|
|
err = BPF_CGROUP_RUN_PROG_INET4_POST_BIND(sk);
|
|
if (err) {
|
|
inet->inet_saddr = inet->inet_rcv_saddr = 0;
|
|
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:
|
|
if (with_lock)
|
|
release_sock(sk);
|
|
out:
|
|
return err;
|
|
}
|
|
|
|
int inet_dgram_connect(struct socket *sock, struct sockaddr *uaddr,
|
|
int addr_len, int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err;
|
|
|
|
if (addr_len < sizeof(uaddr->sa_family))
|
|
return -EINVAL;
|
|
if (uaddr->sa_family == AF_UNSPEC)
|
|
return sk->sk_prot->disconnect(sk, flags);
|
|
|
|
if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
|
|
err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (!inet_sk(sk)->inet_num && inet_autobind(sk))
|
|
return -EAGAIN;
|
|
return sk->sk_prot->connect(sk, uaddr, addr_len);
|
|
}
|
|
EXPORT_SYMBOL(inet_dgram_connect);
|
|
|
|
static long inet_wait_for_connect(struct sock *sk, long timeo, int writebias)
|
|
{
|
|
DEFINE_WAIT_FUNC(wait, woken_wake_function);
|
|
|
|
add_wait_queue(sk_sleep(sk), &wait);
|
|
sk->sk_write_pending += writebias;
|
|
|
|
/* 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 = wait_woken(&wait, TASK_INTERRUPTIBLE, timeo);
|
|
lock_sock(sk);
|
|
if (signal_pending(current) || !timeo)
|
|
break;
|
|
}
|
|
remove_wait_queue(sk_sleep(sk), &wait);
|
|
sk->sk_write_pending -= writebias;
|
|
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, int is_sendmsg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err;
|
|
long timeo;
|
|
|
|
/*
|
|
* uaddr can be NULL and addr_len can be 0 if:
|
|
* sk is a TCP fastopen active socket and
|
|
* TCP_FASTOPEN_CONNECT sockopt is set and
|
|
* we already have a valid cookie for this socket.
|
|
* In this case, user can call write() after connect().
|
|
* write() will invoke tcp_sendmsg_fastopen() which calls
|
|
* __inet_stream_connect().
|
|
*/
|
|
if (uaddr) {
|
|
if (addr_len < sizeof(uaddr->sa_family))
|
|
return -EINVAL;
|
|
|
|
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:
|
|
if (inet_sk(sk)->defer_connect)
|
|
err = is_sendmsg ? -EINPROGRESS : -EISCONN;
|
|
else
|
|
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;
|
|
|
|
if (BPF_CGROUP_PRE_CONNECT_ENABLED(sk)) {
|
|
err = sk->sk_prot->pre_connect(sk, uaddr, addr_len);
|
|
if (err)
|
|
goto out;
|
|
}
|
|
|
|
err = sk->sk_prot->connect(sk, uaddr, addr_len);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
sock->state = SS_CONNECTING;
|
|
|
|
if (!err && inet_sk(sk)->defer_connect)
|
|
goto out;
|
|
|
|
/* 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)) {
|
|
int writebias = (sk->sk_protocol == IPPROTO_TCP) &&
|
|
tcp_sk(sk)->fastopen_req &&
|
|
tcp_sk(sk)->fastopen_req->data ? 1 : 0;
|
|
|
|
/* Error code is set above */
|
|
if (!timeo || !inet_wait_for_connect(sk, timeo, writebias))
|
|
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:
|
|
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);
|
|
|
|
int inet_stream_connect(struct socket *sock, struct sockaddr *uaddr,
|
|
int addr_len, int flags)
|
|
{
|
|
int err;
|
|
|
|
lock_sock(sock->sk);
|
|
err = __inet_stream_connect(sock, uaddr, addr_len, flags, 0);
|
|
release_sock(sock->sk);
|
|
return err;
|
|
}
|
|
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,
|
|
bool kern)
|
|
{
|
|
struct sock *sk1 = sock->sk;
|
|
int err = -EINVAL;
|
|
struct sock *sk2 = sk1->sk_prot->accept(sk1, flags, &err, kern);
|
|
|
|
if (!sk2)
|
|
goto do_err;
|
|
|
|
lock_sock(sk2);
|
|
|
|
sock_rps_record_flow(sk2);
|
|
WARN_ON(!((1 << sk2->sk_state) &
|
|
(TCPF_ESTABLISHED | TCPF_SYN_RECV |
|
|
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 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));
|
|
return sizeof(*sin);
|
|
}
|
|
EXPORT_SYMBOL(inet_getname);
|
|
|
|
int inet_sendmsg(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(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 socket *sock, struct msghdr *msg, size_t size,
|
|
int flags)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int addr_len = 0;
|
|
int err;
|
|
|
|
if (likely(!(flags & MSG_ERRQUEUE)))
|
|
sock_rps_record_flow(sk);
|
|
|
|
err = sk->sk_prot->recvmsg(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
|
|
EPOLLHUP, even on eg. unconnected UDP sockets -- RR */
|
|
/* fall through */
|
|
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);
|
|
void __user *p = (void __user *)arg;
|
|
struct ifreq ifr;
|
|
struct rtentry rt;
|
|
|
|
switch (cmd) {
|
|
case SIOCADDRT:
|
|
case SIOCDELRT:
|
|
if (copy_from_user(&rt, p, sizeof(struct rtentry)))
|
|
return -EFAULT;
|
|
err = ip_rt_ioctl(net, cmd, &rt);
|
|
break;
|
|
case SIOCRTMSG:
|
|
err = -EINVAL;
|
|
break;
|
|
case SIOCDARP:
|
|
case SIOCGARP:
|
|
case SIOCSARP:
|
|
err = arp_ioctl(net, cmd, (void __user *)arg);
|
|
break;
|
|
case SIOCGIFADDR:
|
|
case SIOCGIFBRDADDR:
|
|
case SIOCGIFNETMASK:
|
|
case SIOCGIFDSTADDR:
|
|
case SIOCGIFPFLAGS:
|
|
if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
err = devinet_ioctl(net, cmd, &ifr);
|
|
if (!err && copy_to_user(p, &ifr, sizeof(struct ifreq)))
|
|
err = -EFAULT;
|
|
break;
|
|
|
|
case SIOCSIFADDR:
|
|
case SIOCSIFBRDADDR:
|
|
case SIOCSIFNETMASK:
|
|
case SIOCSIFDSTADDR:
|
|
case SIOCSIFPFLAGS:
|
|
case SIOCSIFFLAGS:
|
|
if (copy_from_user(&ifr, p, sizeof(struct ifreq)))
|
|
return -EFAULT;
|
|
err = devinet_ioctl(net, cmd, &ifr);
|
|
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);
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
int err = -ENOIOCTLCMD;
|
|
|
|
if (sk->sk_prot->compat_ioctl)
|
|
err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
|
|
|
|
return err;
|
|
}
|
|
#endif
|
|
|
|
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,
|
|
.gettstamp = sock_gettstamp,
|
|
.listen = inet_listen,
|
|
.shutdown = inet_shutdown,
|
|
.setsockopt = sock_common_setsockopt,
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet_sendmsg,
|
|
.recvmsg = inet_recvmsg,
|
|
#ifdef CONFIG_MMU
|
|
.mmap = tcp_mmap,
|
|
#endif
|
|
.sendpage = inet_sendpage,
|
|
.splice_read = tcp_splice_read,
|
|
.read_sock = tcp_read_sock,
|
|
.sendmsg_locked = tcp_sendmsg_locked,
|
|
.sendpage_locked = tcp_sendpage_locked,
|
|
.peek_len = tcp_peek_len,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
.compat_ioctl = inet_compat_ioctl,
|
|
#endif
|
|
.set_rcvlowat = tcp_set_rcvlowat,
|
|
};
|
|
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,
|
|
.gettstamp = sock_gettstamp,
|
|
.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,
|
|
.set_peek_off = sk_set_peek_off,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
.compat_ioctl = inet_compat_ioctl,
|
|
#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,
|
|
.gettstamp = sock_gettstamp,
|
|
.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,
|
|
.compat_ioctl = inet_compat_ioctl,
|
|
#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,
|
|
.flags = INET_PROTOSW_PERMANENT |
|
|
INET_PROTOSW_ICSK,
|
|
},
|
|
|
|
{
|
|
.type = SOCK_DGRAM,
|
|
.protocol = IPPROTO_UDP,
|
|
.prot = &udp_prot,
|
|
.ops = &inet_dgram_ops,
|
|
.flags = INET_PROTOSW_PERMANENT,
|
|
},
|
|
|
|
{
|
|
.type = SOCK_DGRAM,
|
|
.protocol = IPPROTO_ICMP,
|
|
.prot = &ping_prot,
|
|
.ops = &inet_sockraw_ops,
|
|
.flags = INET_PROTOSW_REUSE,
|
|
},
|
|
|
|
{
|
|
.type = SOCK_RAW,
|
|
.protocol = IPPROTO_IP, /* wild card */
|
|
.prot = &raw_prot,
|
|
.ops = &inet_sockraw_ops,
|
|
.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. */
|
|
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) == 0)
|
|
break;
|
|
if (protocol == answer->protocol)
|
|
goto out_permanent;
|
|
last_perm = lh;
|
|
}
|
|
|
|
/* 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:
|
|
pr_err("Attempt to override permanent protocol %d\n", protocol);
|
|
goto out;
|
|
|
|
out_illegal:
|
|
pr_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) {
|
|
pr_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);
|
|
|
|
static int inet_sk_reselect_saddr(struct sock *sk)
|
|
{
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
__be32 old_saddr = inet->inet_saddr;
|
|
__be32 daddr = inet->inet_daddr;
|
|
struct flowi4 *fl4;
|
|
struct rtable *rt;
|
|
__be32 new_saddr;
|
|
struct ip_options_rcu *inet_opt;
|
|
|
|
inet_opt = rcu_dereference_protected(inet->inet_opt,
|
|
lockdep_sock_is_held(sk));
|
|
if (inet_opt && inet_opt->opt.srr)
|
|
daddr = inet_opt->opt.faddr;
|
|
|
|
/* Query new route. */
|
|
fl4 = &inet->cork.fl.u.ip4;
|
|
rt = ip_route_connect(fl4, daddr, 0, RT_CONN_FLAGS(sk),
|
|
sk->sk_bound_dev_if, sk->sk_protocol,
|
|
inet->inet_sport, inet->inet_dport, sk);
|
|
if (IS_ERR(rt))
|
|
return PTR_ERR(rt);
|
|
|
|
sk_setup_caps(sk, &rt->dst);
|
|
|
|
new_saddr = fl4->saddr;
|
|
|
|
if (new_saddr == old_saddr)
|
|
return 0;
|
|
|
|
if (sock_net(sk)->ipv4.sysctl_ip_dynaddr > 1) {
|
|
pr_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.
|
|
*/
|
|
return __sk_prot_rehash(sk);
|
|
}
|
|
|
|
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;
|
|
struct ip_options_rcu *inet_opt;
|
|
struct flowi4 *fl4;
|
|
int err;
|
|
|
|
/* Route is OK, nothing to do. */
|
|
if (rt)
|
|
return 0;
|
|
|
|
/* Reroute. */
|
|
rcu_read_lock();
|
|
inet_opt = rcu_dereference(inet->inet_opt);
|
|
daddr = inet->inet_daddr;
|
|
if (inet_opt && inet_opt->opt.srr)
|
|
daddr = inet_opt->opt.faddr;
|
|
rcu_read_unlock();
|
|
fl4 = &inet->cork.fl.u.ip4;
|
|
rt = ip_route_output_ports(sock_net(sk), fl4, sk, daddr, inet->inet_saddr,
|
|
inet->inet_dport, inet->inet_sport,
|
|
sk->sk_protocol, RT_CONN_FLAGS(sk),
|
|
sk->sk_bound_dev_if);
|
|
if (!IS_ERR(rt)) {
|
|
err = 0;
|
|
sk_setup_caps(sk, &rt->dst);
|
|
} else {
|
|
err = PTR_ERR(rt);
|
|
|
|
/* 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 (!sock_net(sk)->ipv4.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);
|
|
|
|
void inet_sk_set_state(struct sock *sk, int state)
|
|
{
|
|
trace_inet_sock_set_state(sk, sk->sk_state, state);
|
|
sk->sk_state = state;
|
|
}
|
|
EXPORT_SYMBOL(inet_sk_set_state);
|
|
|
|
void inet_sk_state_store(struct sock *sk, int newstate)
|
|
{
|
|
trace_inet_sock_set_state(sk, sk->sk_state, newstate);
|
|
smp_store_release(&sk->sk_state, newstate);
|
|
}
|
|
|
|
struct sk_buff *inet_gso_segment(struct sk_buff *skb,
|
|
netdev_features_t features)
|
|
{
|
|
bool udpfrag = false, fixedid = false, gso_partial, encap;
|
|
struct sk_buff *segs = ERR_PTR(-EINVAL);
|
|
const struct net_offload *ops;
|
|
unsigned int offset = 0;
|
|
struct iphdr *iph;
|
|
int proto, tot_len;
|
|
int nhoff;
|
|
int ihl;
|
|
int id;
|
|
|
|
skb_reset_network_header(skb);
|
|
nhoff = skb_network_header(skb) - skb_mac_header(skb);
|
|
if (unlikely(!pskb_may_pull(skb, sizeof(*iph))))
|
|
goto out;
|
|
|
|
iph = ip_hdr(skb);
|
|
ihl = iph->ihl * 4;
|
|
if (ihl < sizeof(*iph))
|
|
goto out;
|
|
|
|
id = ntohs(iph->id);
|
|
proto = iph->protocol;
|
|
|
|
/* Warning: after this point, iph might be no longer valid */
|
|
if (unlikely(!pskb_may_pull(skb, ihl)))
|
|
goto out;
|
|
__skb_pull(skb, ihl);
|
|
|
|
encap = SKB_GSO_CB(skb)->encap_level > 0;
|
|
if (encap)
|
|
features &= skb->dev->hw_enc_features;
|
|
SKB_GSO_CB(skb)->encap_level += ihl;
|
|
|
|
skb_reset_transport_header(skb);
|
|
|
|
segs = ERR_PTR(-EPROTONOSUPPORT);
|
|
|
|
if (!skb->encapsulation || encap) {
|
|
udpfrag = !!(skb_shinfo(skb)->gso_type & SKB_GSO_UDP);
|
|
fixedid = !!(skb_shinfo(skb)->gso_type & SKB_GSO_TCP_FIXEDID);
|
|
|
|
/* fixed ID is invalid if DF bit is not set */
|
|
if (fixedid && !(ip_hdr(skb)->frag_off & htons(IP_DF)))
|
|
goto out;
|
|
}
|
|
|
|
ops = rcu_dereference(inet_offloads[proto]);
|
|
if (likely(ops && ops->callbacks.gso_segment))
|
|
segs = ops->callbacks.gso_segment(skb, features);
|
|
|
|
if (IS_ERR_OR_NULL(segs))
|
|
goto out;
|
|
|
|
gso_partial = !!(skb_shinfo(segs)->gso_type & SKB_GSO_PARTIAL);
|
|
|
|
skb = segs;
|
|
do {
|
|
iph = (struct iphdr *)(skb_mac_header(skb) + nhoff);
|
|
if (udpfrag) {
|
|
iph->frag_off = htons(offset >> 3);
|
|
if (skb->next)
|
|
iph->frag_off |= htons(IP_MF);
|
|
offset += skb->len - nhoff - ihl;
|
|
tot_len = skb->len - nhoff;
|
|
} else if (skb_is_gso(skb)) {
|
|
if (!fixedid) {
|
|
iph->id = htons(id);
|
|
id += skb_shinfo(skb)->gso_segs;
|
|
}
|
|
|
|
if (gso_partial)
|
|
tot_len = skb_shinfo(skb)->gso_size +
|
|
SKB_GSO_CB(skb)->data_offset +
|
|
skb->head - (unsigned char *)iph;
|
|
else
|
|
tot_len = skb->len - nhoff;
|
|
} else {
|
|
if (!fixedid)
|
|
iph->id = htons(id++);
|
|
tot_len = skb->len - nhoff;
|
|
}
|
|
iph->tot_len = htons(tot_len);
|
|
ip_send_check(iph);
|
|
if (encap)
|
|
skb_reset_inner_headers(skb);
|
|
skb->network_header = (u8 *)iph - skb->head;
|
|
skb_reset_mac_len(skb);
|
|
} while ((skb = skb->next));
|
|
|
|
out:
|
|
return segs;
|
|
}
|
|
EXPORT_SYMBOL(inet_gso_segment);
|
|
|
|
static struct sk_buff *ipip_gso_segment(struct sk_buff *skb,
|
|
netdev_features_t features)
|
|
{
|
|
if (!(skb_shinfo(skb)->gso_type & SKB_GSO_IPXIP4))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
return inet_gso_segment(skb, features);
|
|
}
|
|
|
|
INDIRECT_CALLABLE_DECLARE(struct sk_buff *tcp4_gro_receive(struct list_head *,
|
|
struct sk_buff *));
|
|
INDIRECT_CALLABLE_DECLARE(struct sk_buff *udp4_gro_receive(struct list_head *,
|
|
struct sk_buff *));
|
|
struct sk_buff *inet_gro_receive(struct list_head *head, struct sk_buff *skb)
|
|
{
|
|
const struct net_offload *ops;
|
|
struct sk_buff *pp = NULL;
|
|
const struct iphdr *iph;
|
|
struct sk_buff *p;
|
|
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;
|
|
|
|
rcu_read_lock();
|
|
ops = rcu_dereference(inet_offloads[proto]);
|
|
if (!ops || !ops->callbacks.gro_receive)
|
|
goto out_unlock;
|
|
|
|
if (*(u8 *)iph != 0x45)
|
|
goto out_unlock;
|
|
|
|
if (ip_is_fragment(iph))
|
|
goto out_unlock;
|
|
|
|
if (unlikely(ip_fast_csum((u8 *)iph, 5)))
|
|
goto out_unlock;
|
|
|
|
id = ntohl(*(__be32 *)&iph->id);
|
|
flush = (u16)((ntohl(*(__be32 *)iph) ^ skb_gro_len(skb)) | (id & ~IP_DF));
|
|
id >>= 16;
|
|
|
|
list_for_each_entry(p, head, list) {
|
|
struct iphdr *iph2;
|
|
u16 flush_id;
|
|
|
|
if (!NAPI_GRO_CB(p)->same_flow)
|
|
continue;
|
|
|
|
iph2 = (struct iphdr *)(p->data + off);
|
|
/* The above works because, with the exception of the top
|
|
* (inner most) layer, we only aggregate pkts with the same
|
|
* hdr length so all the hdrs we'll need to verify will start
|
|
* at the same offset.
|
|
*/
|
|
if ((iph->protocol ^ iph2->protocol) |
|
|
((__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) |
|
|
(iph->tos ^ iph2->tos) |
|
|
((iph->frag_off ^ iph2->frag_off) & htons(IP_DF));
|
|
|
|
NAPI_GRO_CB(p)->flush |= flush;
|
|
|
|
/* We need to store of the IP ID check to be included later
|
|
* when we can verify that this packet does in fact belong
|
|
* to a given flow.
|
|
*/
|
|
flush_id = (u16)(id - ntohs(iph2->id));
|
|
|
|
/* This bit of code makes it much easier for us to identify
|
|
* the cases where we are doing atomic vs non-atomic IP ID
|
|
* checks. Specifically an atomic check can return IP ID
|
|
* values 0 - 0xFFFF, while a non-atomic check can only
|
|
* return 0 or 0xFFFF.
|
|
*/
|
|
if (!NAPI_GRO_CB(p)->is_atomic ||
|
|
!(iph->frag_off & htons(IP_DF))) {
|
|
flush_id ^= NAPI_GRO_CB(p)->count;
|
|
flush_id = flush_id ? 0xFFFF : 0;
|
|
}
|
|
|
|
/* If the previous IP ID value was based on an atomic
|
|
* datagram we can overwrite the value and ignore it.
|
|
*/
|
|
if (NAPI_GRO_CB(skb)->is_atomic)
|
|
NAPI_GRO_CB(p)->flush_id = flush_id;
|
|
else
|
|
NAPI_GRO_CB(p)->flush_id |= flush_id;
|
|
}
|
|
|
|
NAPI_GRO_CB(skb)->is_atomic = !!(iph->frag_off & htons(IP_DF));
|
|
NAPI_GRO_CB(skb)->flush |= flush;
|
|
skb_set_network_header(skb, off);
|
|
/* The above will be needed by the transport layer if there is one
|
|
* immediately following this IP hdr.
|
|
*/
|
|
|
|
/* Note : No need to call skb_gro_postpull_rcsum() here,
|
|
* as we already checked checksum over ipv4 header was 0
|
|
*/
|
|
skb_gro_pull(skb, sizeof(*iph));
|
|
skb_set_transport_header(skb, skb_gro_offset(skb));
|
|
|
|
pp = indirect_call_gro_receive(tcp4_gro_receive, udp4_gro_receive,
|
|
ops->callbacks.gro_receive, head, skb);
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
|
|
out:
|
|
skb_gro_flush_final(skb, pp, flush);
|
|
|
|
return pp;
|
|
}
|
|
EXPORT_SYMBOL(inet_gro_receive);
|
|
|
|
static struct sk_buff *ipip_gro_receive(struct list_head *head,
|
|
struct sk_buff *skb)
|
|
{
|
|
if (NAPI_GRO_CB(skb)->encap_mark) {
|
|
NAPI_GRO_CB(skb)->flush = 1;
|
|
return NULL;
|
|
}
|
|
|
|
NAPI_GRO_CB(skb)->encap_mark = 1;
|
|
|
|
return inet_gro_receive(head, skb);
|
|
}
|
|
|
|
#define SECONDS_PER_DAY 86400
|
|
|
|
/* inet_current_timestamp - Return IP network timestamp
|
|
*
|
|
* Return milliseconds since midnight in network byte order.
|
|
*/
|
|
__be32 inet_current_timestamp(void)
|
|
{
|
|
u32 secs;
|
|
u32 msecs;
|
|
struct timespec64 ts;
|
|
|
|
ktime_get_real_ts64(&ts);
|
|
|
|
/* Get secs since midnight. */
|
|
(void)div_u64_rem(ts.tv_sec, SECONDS_PER_DAY, &secs);
|
|
/* Convert to msecs. */
|
|
msecs = secs * MSEC_PER_SEC;
|
|
/* Convert nsec to msec. */
|
|
msecs += (u32)ts.tv_nsec / NSEC_PER_MSEC;
|
|
|
|
/* Convert to network byte order. */
|
|
return htonl(msecs);
|
|
}
|
|
EXPORT_SYMBOL(inet_current_timestamp);
|
|
|
|
int inet_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len)
|
|
{
|
|
if (sk->sk_family == AF_INET)
|
|
return ip_recv_error(sk, msg, len, addr_len);
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (sk->sk_family == AF_INET6)
|
|
return pingv6_ops.ipv6_recv_error(sk, msg, len, addr_len);
|
|
#endif
|
|
return -EINVAL;
|
|
}
|
|
|
|
INDIRECT_CALLABLE_DECLARE(int tcp4_gro_complete(struct sk_buff *, int));
|
|
INDIRECT_CALLABLE_DECLARE(int udp4_gro_complete(struct sk_buff *, int));
|
|
int inet_gro_complete(struct sk_buff *skb, int nhoff)
|
|
{
|
|
__be16 newlen = htons(skb->len - nhoff);
|
|
struct iphdr *iph = (struct iphdr *)(skb->data + nhoff);
|
|
const struct net_offload *ops;
|
|
int proto = iph->protocol;
|
|
int err = -ENOSYS;
|
|
|
|
if (skb->encapsulation) {
|
|
skb_set_inner_protocol(skb, cpu_to_be16(ETH_P_IP));
|
|
skb_set_inner_network_header(skb, nhoff);
|
|
}
|
|
|
|
csum_replace2(&iph->check, iph->tot_len, newlen);
|
|
iph->tot_len = newlen;
|
|
|
|
rcu_read_lock();
|
|
ops = rcu_dereference(inet_offloads[proto]);
|
|
if (WARN_ON(!ops || !ops->callbacks.gro_complete))
|
|
goto out_unlock;
|
|
|
|
/* Only need to add sizeof(*iph) to get to the next hdr below
|
|
* because any hdr with option will have been flushed in
|
|
* inet_gro_receive().
|
|
*/
|
|
err = INDIRECT_CALL_2(ops->callbacks.gro_complete,
|
|
tcp4_gro_complete, udp4_gro_complete,
|
|
skb, nhoff + sizeof(*iph));
|
|
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
EXPORT_SYMBOL(inet_gro_complete);
|
|
|
|
static int ipip_gro_complete(struct sk_buff *skb, int nhoff)
|
|
{
|
|
skb->encapsulation = 1;
|
|
skb_shinfo(skb)->gso_type |= SKB_GSO_IPXIP4;
|
|
return inet_gro_complete(skb, nhoff);
|
|
}
|
|
|
|
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(net, 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);
|
|
}
|
|
return rc;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_ctl_sock_create);
|
|
|
|
u64 snmp_get_cpu_field(void __percpu *mib, int cpu, int offt)
|
|
{
|
|
return *(((unsigned long *)per_cpu_ptr(mib, cpu)) + offt);
|
|
}
|
|
EXPORT_SYMBOL_GPL(snmp_get_cpu_field);
|
|
|
|
unsigned long snmp_fold_field(void __percpu *mib, int offt)
|
|
{
|
|
unsigned long res = 0;
|
|
int i;
|
|
|
|
for_each_possible_cpu(i)
|
|
res += snmp_get_cpu_field(mib, i, offt);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snmp_fold_field);
|
|
|
|
#if BITS_PER_LONG==32
|
|
|
|
u64 snmp_get_cpu_field64(void __percpu *mib, int cpu, int offt,
|
|
size_t syncp_offset)
|
|
{
|
|
void *bhptr;
|
|
struct u64_stats_sync *syncp;
|
|
u64 v;
|
|
unsigned int start;
|
|
|
|
bhptr = per_cpu_ptr(mib, cpu);
|
|
syncp = (struct u64_stats_sync *)(bhptr + syncp_offset);
|
|
do {
|
|
start = u64_stats_fetch_begin_irq(syncp);
|
|
v = *(((u64 *)bhptr) + offt);
|
|
} while (u64_stats_fetch_retry_irq(syncp, start));
|
|
|
|
return v;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snmp_get_cpu_field64);
|
|
|
|
u64 snmp_fold_field64(void __percpu *mib, int offt, size_t syncp_offset)
|
|
{
|
|
u64 res = 0;
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
res += snmp_get_cpu_field64(mib, cpu, offt, syncp_offset);
|
|
}
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL_GPL(snmp_fold_field64);
|
|
#endif
|
|
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
static const struct net_protocol igmp_protocol = {
|
|
.handler = igmp_rcv,
|
|
.netns_ok = 1,
|
|
};
|
|
#endif
|
|
|
|
/* thinking of making this const? Don't.
|
|
* early_demux can change based on sysctl.
|
|
*/
|
|
static struct net_protocol tcp_protocol = {
|
|
.early_demux = tcp_v4_early_demux,
|
|
.early_demux_handler = tcp_v4_early_demux,
|
|
.handler = tcp_v4_rcv,
|
|
.err_handler = tcp_v4_err,
|
|
.no_policy = 1,
|
|
.netns_ok = 1,
|
|
.icmp_strict_tag_validation = 1,
|
|
};
|
|
|
|
/* thinking of making this const? Don't.
|
|
* early_demux can change based on sysctl.
|
|
*/
|
|
static struct net_protocol udp_protocol = {
|
|
.early_demux = udp_v4_early_demux,
|
|
.early_demux_handler = udp_v4_early_demux,
|
|
.handler = udp_rcv,
|
|
.err_handler = udp_err,
|
|
.no_policy = 1,
|
|
.netns_ok = 1,
|
|
};
|
|
|
|
static const struct net_protocol icmp_protocol = {
|
|
.handler = icmp_rcv,
|
|
.err_handler = icmp_err,
|
|
.no_policy = 1,
|
|
.netns_ok = 1,
|
|
};
|
|
|
|
static __net_init int ipv4_mib_init_net(struct net *net)
|
|
{
|
|
int i;
|
|
|
|
net->mib.tcp_statistics = alloc_percpu(struct tcp_mib);
|
|
if (!net->mib.tcp_statistics)
|
|
goto err_tcp_mib;
|
|
net->mib.ip_statistics = alloc_percpu(struct ipstats_mib);
|
|
if (!net->mib.ip_statistics)
|
|
goto err_ip_mib;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct ipstats_mib *af_inet_stats;
|
|
af_inet_stats = per_cpu_ptr(net->mib.ip_statistics, i);
|
|
u64_stats_init(&af_inet_stats->syncp);
|
|
}
|
|
|
|
net->mib.net_statistics = alloc_percpu(struct linux_mib);
|
|
if (!net->mib.net_statistics)
|
|
goto err_net_mib;
|
|
net->mib.udp_statistics = alloc_percpu(struct udp_mib);
|
|
if (!net->mib.udp_statistics)
|
|
goto err_udp_mib;
|
|
net->mib.udplite_statistics = alloc_percpu(struct udp_mib);
|
|
if (!net->mib.udplite_statistics)
|
|
goto err_udplite_mib;
|
|
net->mib.icmp_statistics = alloc_percpu(struct icmp_mib);
|
|
if (!net->mib.icmp_statistics)
|
|
goto err_icmp_mib;
|
|
net->mib.icmpmsg_statistics = kzalloc(sizeof(struct icmpmsg_mib),
|
|
GFP_KERNEL);
|
|
if (!net->mib.icmpmsg_statistics)
|
|
goto err_icmpmsg_mib;
|
|
|
|
tcp_mib_init(net);
|
|
return 0;
|
|
|
|
err_icmpmsg_mib:
|
|
free_percpu(net->mib.icmp_statistics);
|
|
err_icmp_mib:
|
|
free_percpu(net->mib.udplite_statistics);
|
|
err_udplite_mib:
|
|
free_percpu(net->mib.udp_statistics);
|
|
err_udp_mib:
|
|
free_percpu(net->mib.net_statistics);
|
|
err_net_mib:
|
|
free_percpu(net->mib.ip_statistics);
|
|
err_ip_mib:
|
|
free_percpu(net->mib.tcp_statistics);
|
|
err_tcp_mib:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static __net_exit void ipv4_mib_exit_net(struct net *net)
|
|
{
|
|
kfree(net->mib.icmpmsg_statistics);
|
|
free_percpu(net->mib.icmp_statistics);
|
|
free_percpu(net->mib.udplite_statistics);
|
|
free_percpu(net->mib.udp_statistics);
|
|
free_percpu(net->mib.net_statistics);
|
|
free_percpu(net->mib.ip_statistics);
|
|
free_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 __net_init int inet_init_net(struct net *net)
|
|
{
|
|
/*
|
|
* Set defaults for local port range
|
|
*/
|
|
seqlock_init(&net->ipv4.ip_local_ports.lock);
|
|
net->ipv4.ip_local_ports.range[0] = 32768;
|
|
net->ipv4.ip_local_ports.range[1] = 60999;
|
|
|
|
seqlock_init(&net->ipv4.ping_group_range.lock);
|
|
/*
|
|
* Sane defaults - nobody may create ping sockets.
|
|
* Boot scripts should set this to distro-specific group.
|
|
*/
|
|
net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
|
|
net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
|
|
|
|
/* Default values for sysctl-controlled parameters.
|
|
* We set them here, in case sysctl is not compiled.
|
|
*/
|
|
net->ipv4.sysctl_ip_default_ttl = IPDEFTTL;
|
|
net->ipv4.sysctl_ip_fwd_update_priority = 1;
|
|
net->ipv4.sysctl_ip_dynaddr = 0;
|
|
net->ipv4.sysctl_ip_early_demux = 1;
|
|
net->ipv4.sysctl_udp_early_demux = 1;
|
|
net->ipv4.sysctl_tcp_early_demux = 1;
|
|
#ifdef CONFIG_SYSCTL
|
|
net->ipv4.sysctl_ip_prot_sock = PROT_SOCK;
|
|
#endif
|
|
|
|
/* Some igmp sysctl, whose values are always used */
|
|
net->ipv4.sysctl_igmp_max_memberships = 20;
|
|
net->ipv4.sysctl_igmp_max_msf = 10;
|
|
/* IGMP reports for link-local multicast groups are enabled by default */
|
|
net->ipv4.sysctl_igmp_llm_reports = 1;
|
|
net->ipv4.sysctl_igmp_qrv = 2;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __net_exit void inet_exit_net(struct net *net)
|
|
{
|
|
}
|
|
|
|
static __net_initdata struct pernet_operations af_inet_ops = {
|
|
.init = inet_init_net,
|
|
.exit = inet_exit_net,
|
|
};
|
|
|
|
static int __init init_inet_pernet_ops(void)
|
|
{
|
|
return register_pernet_subsys(&af_inet_ops);
|
|
}
|
|
|
|
static int ipv4_proc_init(void);
|
|
|
|
/*
|
|
* IP protocol layer initialiser
|
|
*/
|
|
|
|
static struct packet_offload ip_packet_offload __read_mostly = {
|
|
.type = cpu_to_be16(ETH_P_IP),
|
|
.callbacks = {
|
|
.gso_segment = inet_gso_segment,
|
|
.gro_receive = inet_gro_receive,
|
|
.gro_complete = inet_gro_complete,
|
|
},
|
|
};
|
|
|
|
static const struct net_offload ipip_offload = {
|
|
.callbacks = {
|
|
.gso_segment = ipip_gso_segment,
|
|
.gro_receive = ipip_gro_receive,
|
|
.gro_complete = ipip_gro_complete,
|
|
},
|
|
};
|
|
|
|
static int __init ipip_offload_init(void)
|
|
{
|
|
return inet_add_offload(&ipip_offload, IPPROTO_IPIP);
|
|
}
|
|
|
|
static int __init ipv4_offload_init(void)
|
|
{
|
|
/*
|
|
* Add offloads
|
|
*/
|
|
if (udpv4_offload_init() < 0)
|
|
pr_crit("%s: Cannot add UDP protocol offload\n", __func__);
|
|
if (tcpv4_offload_init() < 0)
|
|
pr_crit("%s: Cannot add TCP protocol offload\n", __func__);
|
|
if (ipip_offload_init() < 0)
|
|
pr_crit("%s: Cannot add IPIP protocol offload\n", __func__);
|
|
|
|
dev_add_offload(&ip_packet_offload);
|
|
return 0;
|
|
}
|
|
|
|
fs_initcall(ipv4_offload_init);
|
|
|
|
static struct packet_type ip_packet_type __read_mostly = {
|
|
.type = cpu_to_be16(ETH_P_IP),
|
|
.func = ip_rcv,
|
|
.list_func = ip_list_rcv,
|
|
};
|
|
|
|
static int __init inet_init(void)
|
|
{
|
|
struct inet_protosw *q;
|
|
struct list_head *r;
|
|
int rc = -EINVAL;
|
|
|
|
sock_skb_cb_check_size(sizeof(struct inet_skb_parm));
|
|
|
|
rc = proto_register(&tcp_prot, 1);
|
|
if (rc)
|
|
goto out;
|
|
|
|
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;
|
|
|
|
rc = proto_register(&ping_prot, 1);
|
|
if (rc)
|
|
goto out_unregister_raw_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)
|
|
pr_crit("%s: Cannot add ICMP protocol\n", __func__);
|
|
if (inet_add_protocol(&udp_protocol, IPPROTO_UDP) < 0)
|
|
pr_crit("%s: Cannot add UDP protocol\n", __func__);
|
|
if (inet_add_protocol(&tcp_protocol, IPPROTO_TCP) < 0)
|
|
pr_crit("%s: Cannot add TCP protocol\n", __func__);
|
|
#ifdef CONFIG_IP_MULTICAST
|
|
if (inet_add_protocol(&igmp_protocol, IPPROTO_IGMP) < 0)
|
|
pr_crit("%s: Cannot add IGMP protocol\n", __func__);
|
|
#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();
|
|
|
|
/* Setup TCP slab cache for open requests. */
|
|
tcp_init();
|
|
|
|
/* Setup UDP memory threshold */
|
|
udp_init();
|
|
|
|
/* Add UDP-Lite (RFC 3828) */
|
|
udplite4_register();
|
|
|
|
raw_init();
|
|
|
|
ping_init();
|
|
|
|
/*
|
|
* 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())
|
|
pr_crit("%s: Cannot init ipv4 mroute\n", __func__);
|
|
#endif
|
|
|
|
if (init_inet_pernet_ops())
|
|
pr_crit("%s: Cannot init ipv4 inet pernet ops\n", __func__);
|
|
/*
|
|
* Initialise per-cpu ipv4 mibs
|
|
*/
|
|
|
|
if (init_ipv4_mibs())
|
|
pr_crit("%s: Cannot init ipv4 mibs\n", __func__);
|
|
|
|
ipv4_proc_init();
|
|
|
|
ipfrag_init();
|
|
|
|
dev_add_pack(&ip_packet_type);
|
|
|
|
ip_tunnel_core_init();
|
|
|
|
rc = 0;
|
|
out:
|
|
return rc;
|
|
out_unregister_raw_proto:
|
|
proto_unregister(&raw_prot);
|
|
out_unregister_udp_proto:
|
|
proto_unregister(&udp_prot);
|
|
out_unregister_tcp_proto:
|
|
proto_unregister(&tcp_prot);
|
|
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 (ping_proc_init())
|
|
goto out_ping;
|
|
if (ip_misc_proc_init())
|
|
goto out_misc;
|
|
out:
|
|
return rc;
|
|
out_misc:
|
|
ping_proc_exit();
|
|
out_ping:
|
|
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 */
|