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2101 lines
51 KiB
2101 lines
51 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
* INET An implementation of the TCP/IP protocol suite for the LINUX |
|
* 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, <[email protected]> |
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* Florian La Roche, <[email protected]> |
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* Alan Cox, <[email protected]> |
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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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|
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#define pr_fmt(fmt) "IPv4: " fmt |
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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> |
|
#include <linux/kernel.h> |
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#include <linux/kmod.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> |
|
|
|
#include <linux/uaccess.h> |
|
|
|
#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 <net/ping.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> |
|
#include <net/inet_common.h> |
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#include <net/ip_tunnels.h> |
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#include <net/xfrm.h> |
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#include <net/net_namespace.h> |
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#include <net/secure_seq.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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#include <net/l3mdev.h> |
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#include <net/compat.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]; |
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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; |
|
|
|
WRITE_ONCE(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; |
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unsigned char answer_flags; |
|
int try_loading_module = 0; |
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int err; |
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|
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if (protocol < 0 || protocol >= IPPROTO_MAX) |
|
return -EINVAL; |
|
|
|
sock->state = SS_UNCONNECTED; |
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|
|
/* 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) |
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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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/* |
|
* 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 = -ENOMEM; |
|
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; |
|
|
|
if (!sk->sk_kern_sock) |
|
BPF_CGROUP_RUN_PROG_INET_SOCK_RELEASE(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; |
|
sk->sk_prot->close(sk, timeout); |
|
sock->sk = NULL; |
|
} |
|
return 0; |
|
} |
|
EXPORT_SYMBOL(inet_release); |
|
|
|
int inet_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) |
|
{ |
|
struct sock *sk = sock->sk; |
|
u32 flags = BIND_WITH_LOCK; |
|
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_INET_BIND_LOCK(sk, uaddr, |
|
CGROUP_INET4_BIND, &flags); |
|
if (err) |
|
return err; |
|
|
|
return __inet_bind(sk, uaddr, addr_len, flags); |
|
} |
|
EXPORT_SYMBOL(inet_bind); |
|
|
|
int __inet_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len, |
|
u32 flags) |
|
{ |
|
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 (!(flags & BIND_NO_CAP_NET_BIND_SERVICE) && |
|
snum && inet_port_requires_bind_service(net, snum) && |
|
!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 (flags & BIND_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 || |
|
(flags & BIND_FORCE_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; |
|
} |
|
if (!(flags & BIND_FROM_BPF)) { |
|
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 (flags & BIND_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 (data_race(!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; |
|
BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, |
|
CGROUP_INET4_GETPEERNAME, |
|
NULL); |
|
} 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; |
|
BPF_CGROUP_RUN_SA_PROG_LOCK(sk, (struct sockaddr *)sin, |
|
CGROUP_INET4_GETSOCKNAME, |
|
NULL); |
|
} |
|
memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); |
|
return sizeof(*sin); |
|
} |
|
EXPORT_SYMBOL(inet_getname); |
|
|
|
int inet_send_prepare(struct sock *sk) |
|
{ |
|
sock_rps_record_flow(sk); |
|
|
|
/* We may need to bind the socket. */ |
|
if (data_race(!inet_sk(sk)->inet_num) && !sk->sk_prot->no_autobind && |
|
inet_autobind(sk)) |
|
return -EAGAIN; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(inet_send_prepare); |
|
|
|
int inet_sendmsg(struct socket *sock, struct msghdr *msg, size_t size) |
|
{ |
|
struct sock *sk = sock->sk; |
|
|
|
if (unlikely(inet_send_prepare(sk))) |
|
return -EAGAIN; |
|
|
|
return INDIRECT_CALL_2(sk->sk_prot->sendmsg, tcp_sendmsg, udp_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; |
|
|
|
if (unlikely(inet_send_prepare(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); |
|
|
|
INDIRECT_CALLABLE_DECLARE(int udp_recvmsg(struct sock *, struct msghdr *, |
|
size_t, int, int, int *)); |
|
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 = INDIRECT_CALL_2(sk->sk_prot->recvmsg, tcp_recvmsg, udp_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 */ |
|
fallthrough; |
|
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; |
|
fallthrough; |
|
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 (get_user_ifreq(&ifr, NULL, p)) |
|
return -EFAULT; |
|
err = devinet_ioctl(net, cmd, &ifr); |
|
if (!err && put_user_ifreq(&ifr, p)) |
|
err = -EFAULT; |
|
break; |
|
|
|
case SIOCSIFADDR: |
|
case SIOCSIFBRDADDR: |
|
case SIOCSIFNETMASK: |
|
case SIOCSIFDSTADDR: |
|
case SIOCSIFPFLAGS: |
|
case SIOCSIFFLAGS: |
|
if (get_user_ifreq(&ifr, NULL, p)) |
|
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_routing_ioctl(struct sock *sk, unsigned int cmd, |
|
struct compat_rtentry __user *ur) |
|
{ |
|
compat_uptr_t rtdev; |
|
struct rtentry rt; |
|
|
|
if (copy_from_user(&rt.rt_dst, &ur->rt_dst, |
|
3 * sizeof(struct sockaddr)) || |
|
get_user(rt.rt_flags, &ur->rt_flags) || |
|
get_user(rt.rt_metric, &ur->rt_metric) || |
|
get_user(rt.rt_mtu, &ur->rt_mtu) || |
|
get_user(rt.rt_window, &ur->rt_window) || |
|
get_user(rt.rt_irtt, &ur->rt_irtt) || |
|
get_user(rtdev, &ur->rt_dev)) |
|
return -EFAULT; |
|
|
|
rt.rt_dev = compat_ptr(rtdev); |
|
return ip_rt_ioctl(sock_net(sk), cmd, &rt); |
|
} |
|
|
|
static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) |
|
{ |
|
void __user *argp = compat_ptr(arg); |
|
struct sock *sk = sock->sk; |
|
|
|
switch (cmd) { |
|
case SIOCADDRT: |
|
case SIOCDELRT: |
|
return inet_compat_routing_ioctl(sk, cmd, argp); |
|
default: |
|
if (!sk->sk_prot->compat_ioctl) |
|
return -ENOIOCTLCMD; |
|
return sk->sk_prot->compat_ioctl(sk, cmd, arg); |
|
} |
|
} |
|
#endif /* CONFIG_COMPAT */ |
|
|
|
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_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, |
|
.read_sock = udp_read_sock, |
|
.recvmsg = inet_recvmsg, |
|
.mmap = sock_no_mmap, |
|
.sendpage = inet_sendpage, |
|
.set_peek_off = sk_set_peek_off, |
|
#ifdef CONFIG_COMPAT |
|
.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_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; |
|
} |
|
|
|
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); |
|
} |
|
|
|
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; |
|
} |
|
|
|
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; |
|
} |
|
|
|
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; |
|
} |
|
|
|
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, |
|
}; |
|
#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, |
|
.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, |
|
}; |
|
|
|
static const struct net_protocol icmp_protocol = { |
|
.handler = icmp_rcv, |
|
.err_handler = icmp_err, |
|
.no_policy = 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); |
|
#ifdef CONFIG_MPTCP |
|
/* allocated on demand, see mptcp_init_sock() */ |
|
free_percpu(net->mib.mptcp_statistics); |
|
#endif |
|
} |
|
|
|
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; |
|
net->ipv4.sysctl_nexthop_compat_mode = 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; |
|
|
|
net->ipv4.sysctl_fib_notify_on_flag_change = 0; |
|
|
|
return 0; |
|
} |
|
|
|
static __net_initdata struct pernet_operations af_inet_ops = { |
|
.init = inet_init_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; |
|
|
|
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 */
|
|
|