mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 04:46:39 +07:00
90c337da15
When an application needs to force a source IP on an active TCP socket it has to use bind(IP, port=x). As most applications do not want to deal with already used ports, x is often set to 0, meaning the kernel is in charge to find an available port. But kernel does not know yet if this socket is going to be a listener or be connected. It has very limited choices (no full knowledge of final 4-tuple for a connect()) With limited ephemeral port range (about 32K ports), it is very easy to fill the space. This patch adds a new SOL_IP socket option, asking kernel to ignore the 0 port provided by application in bind(IP, port=0) and only remember the given IP address. The port will be automatically chosen at connect() time, in a way that allows sharing a source port as long as the 4-tuples are unique. This new feature is available for both IPv4 and IPv6 (Thanks Neal) Tested: Wrote a test program and checked its behavior on IPv4 and IPv6. strace(1) shows sequences of bind(IP=127.0.0.2, port=0) followed by connect(). Also getsockname() show that the port is still 0 right after bind() but properly allocated after connect(). socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 5 setsockopt(5, SOL_IP, IP_BIND_ADDRESS_NO_PORT, [1], 4) = 0 bind(5, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, 16) = 0 getsockname(5, {sa_family=AF_INET, sin_port=htons(0), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0 connect(5, {sa_family=AF_INET, sin_port=htons(53174), sin_addr=inet_addr("127.0.0.3")}, 16) = 0 getsockname(5, {sa_family=AF_INET, sin_port=htons(38050), sin_addr=inet_addr("127.0.0.2")}, [16]) = 0 IPv6 test : socket(PF_INET6, SOCK_STREAM, IPPROTO_IP) = 7 setsockopt(7, SOL_IP, IP_BIND_ADDRESS_NO_PORT, [1], 4) = 0 bind(7, {sa_family=AF_INET6, sin6_port=htons(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0 getsockname(7, {sa_family=AF_INET6, sin6_port=htons(0), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 0 connect(7, {sa_family=AF_INET6, sin6_port=htons(57300), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, 28) = 0 getsockname(7, {sa_family=AF_INET6, sin6_port=htons(60964), inet_pton(AF_INET6, "::1", &sin6_addr), sin6_flowinfo=0, sin6_scope_id=0}, [28]) = 0 I was able to bind()/connect() a million concurrent IPv4 sockets, instead of ~32000 before patch. lpaa23:~# ulimit -n 1000010 lpaa23:~# ./bind --connect --num-flows=1000000 & 1000000 sockets lpaa23:~# grep TCP /proc/net/sockstat TCP: inuse 2000063 orphan 0 tw 47 alloc 2000157 mem 66 Check that a given source port is indeed used by many different connections : lpaa23:~# ss -t src :40000 | head -10 State Recv-Q Send-Q Local Address:Port Peer Address:Port ESTAB 0 0 127.0.0.2:40000 127.0.202.33:44983 ESTAB 0 0 127.0.0.2:40000 127.2.27.240:44983 ESTAB 0 0 127.0.0.2:40000 127.2.98.5:44983 ESTAB 0 0 127.0.0.2:40000 127.0.124.196:44983 ESTAB 0 0 127.0.0.2:40000 127.2.139.38:44983 ESTAB 0 0 127.0.0.2:40000 127.1.59.80:44983 ESTAB 0 0 127.0.0.2:40000 127.3.6.228:44983 ESTAB 0 0 127.0.0.2:40000 127.0.38.53:44983 ESTAB 0 0 127.0.0.2:40000 127.1.197.10:44983 Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1033 lines
24 KiB
C
1033 lines
24 KiB
C
/*
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* PF_INET6 socket protocol family
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* Linux INET6 implementation
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*
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* Authors:
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* Pedro Roque <roque@di.fc.ul.pt>
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*
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* Adapted from linux/net/ipv4/af_inet.c
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*
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* Fixes:
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* piggy, Karl Knutson : Socket protocol table
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* Hideaki YOSHIFUJI : sin6_scope_id support
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* Arnaldo Melo : check proc_net_create return, cleanups
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#define pr_fmt(fmt) "IPv6: " fmt
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#include <linux/module.h>
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#include <linux/capability.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/socket.h>
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#include <linux/in.h>
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#include <linux/kernel.h>
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#include <linux/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/fcntl.h>
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#include <linux/mm.h>
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#include <linux/interrupt.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/icmpv6.h>
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#include <linux/netfilter_ipv6.h>
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#include <net/ip.h>
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#include <net/ipv6.h>
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#include <net/udp.h>
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#include <net/udplite.h>
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#include <net/tcp.h>
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#include <net/ping.h>
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#include <net/protocol.h>
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#include <net/inet_common.h>
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#include <net/route.h>
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#include <net/transp_v6.h>
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#include <net/ip6_route.h>
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#include <net/addrconf.h>
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#include <net/ndisc.h>
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#ifdef CONFIG_IPV6_TUNNEL
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#include <net/ip6_tunnel.h>
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#endif
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#include <asm/uaccess.h>
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#include <linux/mroute6.h>
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MODULE_AUTHOR("Cast of dozens");
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MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
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MODULE_LICENSE("GPL");
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/* The inetsw6 table contains everything that inet6_create needs to
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* build a new socket.
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*/
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static struct list_head inetsw6[SOCK_MAX];
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static DEFINE_SPINLOCK(inetsw6_lock);
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struct ipv6_params ipv6_defaults = {
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.disable_ipv6 = 0,
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.autoconf = 1,
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};
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static int disable_ipv6_mod;
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module_param_named(disable, disable_ipv6_mod, int, 0444);
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MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
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module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
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MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
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module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
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MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
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static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
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{
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const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
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return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
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}
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static int inet6_create(struct net *net, struct socket *sock, int protocol,
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int kern)
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{
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struct inet_sock *inet;
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struct ipv6_pinfo *np;
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struct sock *sk;
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struct inet_protosw *answer;
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struct proto *answer_prot;
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unsigned char answer_flags;
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int try_loading_module = 0;
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int err;
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/* Look for the requested type/protocol pair. */
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lookup_protocol:
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err = -ESOCKTNOSUPPORT;
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rcu_read_lock();
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list_for_each_entry_rcu(answer, &inetsw6[sock->type], list) {
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err = 0;
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/* Check the non-wild match. */
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if (protocol == answer->protocol) {
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if (protocol != IPPROTO_IP)
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break;
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} else {
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/* Check for the two wild cases. */
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if (IPPROTO_IP == protocol) {
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protocol = answer->protocol;
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break;
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}
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if (IPPROTO_IP == answer->protocol)
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break;
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}
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err = -EPROTONOSUPPORT;
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}
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if (err) {
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if (try_loading_module < 2) {
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rcu_read_unlock();
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/*
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* Be more specific, e.g. net-pf-10-proto-132-type-1
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* (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
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*/
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if (++try_loading_module == 1)
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request_module("net-pf-%d-proto-%d-type-%d",
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PF_INET6, protocol, sock->type);
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/*
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* Fall back to generic, e.g. net-pf-10-proto-132
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* (net-pf-PF_INET6-proto-IPPROTO_SCTP)
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*/
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else
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request_module("net-pf-%d-proto-%d",
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PF_INET6, protocol);
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goto lookup_protocol;
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} else
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goto out_rcu_unlock;
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}
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err = -EPERM;
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if (sock->type == SOCK_RAW && !kern &&
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!ns_capable(net->user_ns, CAP_NET_RAW))
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goto out_rcu_unlock;
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sock->ops = answer->ops;
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answer_prot = answer->prot;
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answer_flags = answer->flags;
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rcu_read_unlock();
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WARN_ON(!answer_prot->slab);
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err = -ENOBUFS;
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sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
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if (!sk)
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goto out;
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sock_init_data(sock, sk);
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err = 0;
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if (INET_PROTOSW_REUSE & answer_flags)
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sk->sk_reuse = SK_CAN_REUSE;
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inet = inet_sk(sk);
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inet->is_icsk = (INET_PROTOSW_ICSK & answer_flags) != 0;
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if (SOCK_RAW == sock->type) {
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inet->inet_num = protocol;
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if (IPPROTO_RAW == protocol)
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inet->hdrincl = 1;
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}
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sk->sk_destruct = inet_sock_destruct;
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sk->sk_family = PF_INET6;
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sk->sk_protocol = protocol;
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sk->sk_backlog_rcv = answer->prot->backlog_rcv;
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inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
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np->hop_limit = -1;
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np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
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np->mc_loop = 1;
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np->pmtudisc = IPV6_PMTUDISC_WANT;
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sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
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/* Init the ipv4 part of the socket since we can have sockets
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* using v6 API for ipv4.
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*/
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inet->uc_ttl = -1;
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inet->mc_loop = 1;
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inet->mc_ttl = 1;
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inet->mc_index = 0;
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inet->mc_list = NULL;
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inet->rcv_tos = 0;
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if (net->ipv4.sysctl_ip_no_pmtu_disc)
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inet->pmtudisc = IP_PMTUDISC_DONT;
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else
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inet->pmtudisc = IP_PMTUDISC_WANT;
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/*
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* Increment only the relevant sk_prot->socks debug field, this changes
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* the previous behaviour of incrementing both the equivalent to
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* answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
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*
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* This allows better debug granularity as we'll know exactly how many
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* UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
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* transport protocol socks. -acme
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*/
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sk_refcnt_debug_inc(sk);
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if (inet->inet_num) {
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/* It assumes that any protocol which allows
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* the user to assign a number at socket
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* creation time automatically shares.
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*/
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inet->inet_sport = htons(inet->inet_num);
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sk->sk_prot->hash(sk);
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}
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if (sk->sk_prot->init) {
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err = sk->sk_prot->init(sk);
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if (err) {
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sk_common_release(sk);
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goto out;
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}
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}
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out:
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return err;
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out_rcu_unlock:
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rcu_read_unlock();
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goto out;
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}
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/* bind for INET6 API */
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int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
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{
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struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
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struct sock *sk = sock->sk;
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struct inet_sock *inet = inet_sk(sk);
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struct ipv6_pinfo *np = inet6_sk(sk);
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struct net *net = sock_net(sk);
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__be32 v4addr = 0;
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unsigned short snum;
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int addr_type = 0;
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int err = 0;
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/* If the socket has its own bind function then use it. */
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if (sk->sk_prot->bind)
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return sk->sk_prot->bind(sk, uaddr, addr_len);
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if (addr_len < SIN6_LEN_RFC2133)
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return -EINVAL;
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if (addr->sin6_family != AF_INET6)
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return -EAFNOSUPPORT;
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addr_type = ipv6_addr_type(&addr->sin6_addr);
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if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
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return -EINVAL;
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snum = ntohs(addr->sin6_port);
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if (snum && snum < PROT_SOCK && !ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
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return -EACCES;
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lock_sock(sk);
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/* Check these errors (active socket, double bind). */
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if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
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err = -EINVAL;
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goto out;
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}
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/* Check if the address belongs to the host. */
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if (addr_type == IPV6_ADDR_MAPPED) {
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int chk_addr_ret;
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|
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/* Binding to v4-mapped address on a v6-only socket
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* makes no sense
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*/
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if (sk->sk_ipv6only) {
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err = -EINVAL;
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goto out;
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}
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|
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/* Reproduce AF_INET checks to make the bindings consistent */
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v4addr = addr->sin6_addr.s6_addr32[3];
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chk_addr_ret = inet_addr_type(net, v4addr);
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if (!net->ipv4.sysctl_ip_nonlocal_bind &&
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!(inet->freebind || inet->transparent) &&
|
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v4addr != htonl(INADDR_ANY) &&
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chk_addr_ret != RTN_LOCAL &&
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chk_addr_ret != RTN_MULTICAST &&
|
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chk_addr_ret != RTN_BROADCAST) {
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|
err = -EADDRNOTAVAIL;
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|
goto out;
|
|
}
|
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} else {
|
|
if (addr_type != IPV6_ADDR_ANY) {
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struct net_device *dev = NULL;
|
|
|
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rcu_read_lock();
|
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if (__ipv6_addr_needs_scope_id(addr_type)) {
|
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if (addr_len >= sizeof(struct sockaddr_in6) &&
|
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addr->sin6_scope_id) {
|
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/* Override any existing binding, if another one
|
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* is supplied by user.
|
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*/
|
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sk->sk_bound_dev_if = addr->sin6_scope_id;
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}
|
|
|
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/* Binding to link-local address requires an interface */
|
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if (!sk->sk_bound_dev_if) {
|
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err = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
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dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
|
|
if (!dev) {
|
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err = -ENODEV;
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
/* ipv4 addr of the socket is invalid. Only the
|
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* unspecified and mapped address have a v4 equivalent.
|
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*/
|
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v4addr = LOOPBACK4_IPV6;
|
|
if (!(addr_type & IPV6_ADDR_MULTICAST)) {
|
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if (!(inet->freebind || inet->transparent) &&
|
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!ipv6_chk_addr(net, &addr->sin6_addr,
|
|
dev, 0)) {
|
|
err = -EADDRNOTAVAIL;
|
|
goto out_unlock;
|
|
}
|
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}
|
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rcu_read_unlock();
|
|
}
|
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}
|
|
|
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inet->inet_rcv_saddr = v4addr;
|
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inet->inet_saddr = v4addr;
|
|
|
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sk->sk_v6_rcv_saddr = addr->sin6_addr;
|
|
|
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if (!(addr_type & IPV6_ADDR_MULTICAST))
|
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np->saddr = addr->sin6_addr;
|
|
|
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/* Make sure we are allowed to bind here. */
|
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if ((snum || !inet->bind_address_no_port) &&
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sk->sk_prot->get_port(sk, snum)) {
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inet_reset_saddr(sk);
|
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err = -EADDRINUSE;
|
|
goto out;
|
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}
|
|
|
|
if (addr_type != IPV6_ADDR_ANY) {
|
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sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
|
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if (addr_type != IPV6_ADDR_MAPPED)
|
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sk->sk_ipv6only = 1;
|
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}
|
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if (snum)
|
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sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
|
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inet->inet_sport = htons(inet->inet_num);
|
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inet->inet_dport = 0;
|
|
inet->inet_daddr = 0;
|
|
out:
|
|
release_sock(sk);
|
|
return err;
|
|
out_unlock:
|
|
rcu_read_unlock();
|
|
goto out;
|
|
}
|
|
EXPORT_SYMBOL(inet6_bind);
|
|
|
|
int inet6_release(struct socket *sock)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
|
|
if (!sk)
|
|
return -EINVAL;
|
|
|
|
/* Free mc lists */
|
|
ipv6_sock_mc_close(sk);
|
|
|
|
/* Free ac lists */
|
|
ipv6_sock_ac_close(sk);
|
|
|
|
return inet_release(sock);
|
|
}
|
|
EXPORT_SYMBOL(inet6_release);
|
|
|
|
void inet6_destroy_sock(struct sock *sk)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct sk_buff *skb;
|
|
struct ipv6_txoptions *opt;
|
|
|
|
/* Release rx options */
|
|
|
|
skb = xchg(&np->pktoptions, NULL);
|
|
if (skb)
|
|
kfree_skb(skb);
|
|
|
|
skb = xchg(&np->rxpmtu, NULL);
|
|
if (skb)
|
|
kfree_skb(skb);
|
|
|
|
/* Free flowlabels */
|
|
fl6_free_socklist(sk);
|
|
|
|
/* Free tx options */
|
|
|
|
opt = xchg(&np->opt, NULL);
|
|
if (opt)
|
|
sock_kfree_s(sk, opt, opt->tot_len);
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet6_destroy_sock);
|
|
|
|
/*
|
|
* This does both peername and sockname.
|
|
*/
|
|
|
|
int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int *uaddr_len, int peer)
|
|
{
|
|
struct sockaddr_in6 *sin = (struct sockaddr_in6 *)uaddr;
|
|
struct sock *sk = sock->sk;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
|
|
sin->sin6_family = AF_INET6;
|
|
sin->sin6_flowinfo = 0;
|
|
sin->sin6_scope_id = 0;
|
|
if (peer) {
|
|
if (!inet->inet_dport)
|
|
return -ENOTCONN;
|
|
if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
|
|
peer == 1)
|
|
return -ENOTCONN;
|
|
sin->sin6_port = inet->inet_dport;
|
|
sin->sin6_addr = sk->sk_v6_daddr;
|
|
if (np->sndflow)
|
|
sin->sin6_flowinfo = np->flow_label;
|
|
} else {
|
|
if (ipv6_addr_any(&sk->sk_v6_rcv_saddr))
|
|
sin->sin6_addr = np->saddr;
|
|
else
|
|
sin->sin6_addr = sk->sk_v6_rcv_saddr;
|
|
|
|
sin->sin6_port = inet->inet_sport;
|
|
}
|
|
sin->sin6_scope_id = ipv6_iface_scope_id(&sin->sin6_addr,
|
|
sk->sk_bound_dev_if);
|
|
*uaddr_len = sizeof(*sin);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(inet6_getname);
|
|
|
|
int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct net *net = sock_net(sk);
|
|
|
|
switch (cmd) {
|
|
case SIOCGSTAMP:
|
|
return sock_get_timestamp(sk, (struct timeval __user *)arg);
|
|
|
|
case SIOCGSTAMPNS:
|
|
return sock_get_timestampns(sk, (struct timespec __user *)arg);
|
|
|
|
case SIOCADDRT:
|
|
case SIOCDELRT:
|
|
|
|
return ipv6_route_ioctl(net, cmd, (void __user *)arg);
|
|
|
|
case SIOCSIFADDR:
|
|
return addrconf_add_ifaddr(net, (void __user *) arg);
|
|
case SIOCDIFADDR:
|
|
return addrconf_del_ifaddr(net, (void __user *) arg);
|
|
case SIOCSIFDSTADDR:
|
|
return addrconf_set_dstaddr(net, (void __user *) arg);
|
|
default:
|
|
if (!sk->sk_prot->ioctl)
|
|
return -ENOIOCTLCMD;
|
|
return sk->sk_prot->ioctl(sk, cmd, arg);
|
|
}
|
|
/*NOTREACHED*/
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(inet6_ioctl);
|
|
|
|
const struct proto_ops inet6_stream_ops = {
|
|
.family = PF_INET6,
|
|
.owner = THIS_MODULE,
|
|
.release = inet6_release,
|
|
.bind = inet6_bind,
|
|
.connect = inet_stream_connect, /* ok */
|
|
.socketpair = sock_no_socketpair, /* a do nothing */
|
|
.accept = inet_accept, /* ok */
|
|
.getname = inet6_getname,
|
|
.poll = tcp_poll, /* ok */
|
|
.ioctl = inet6_ioctl, /* must change */
|
|
.listen = inet_listen, /* ok */
|
|
.shutdown = inet_shutdown, /* ok */
|
|
.setsockopt = sock_common_setsockopt, /* ok */
|
|
.getsockopt = sock_common_getsockopt, /* ok */
|
|
.sendmsg = inet_sendmsg, /* ok */
|
|
.recvmsg = inet_recvmsg, /* ok */
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = inet_sendpage,
|
|
.splice_read = tcp_splice_read,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
const struct proto_ops inet6_dgram_ops = {
|
|
.family = PF_INET6,
|
|
.owner = THIS_MODULE,
|
|
.release = inet6_release,
|
|
.bind = inet6_bind,
|
|
.connect = inet_dgram_connect, /* ok */
|
|
.socketpair = sock_no_socketpair, /* a do nothing */
|
|
.accept = sock_no_accept, /* a do nothing */
|
|
.getname = inet6_getname,
|
|
.poll = udp_poll, /* ok */
|
|
.ioctl = inet6_ioctl, /* must change */
|
|
.listen = sock_no_listen, /* ok */
|
|
.shutdown = inet_shutdown, /* ok */
|
|
.setsockopt = sock_common_setsockopt, /* ok */
|
|
.getsockopt = sock_common_getsockopt, /* ok */
|
|
.sendmsg = inet_sendmsg, /* ok */
|
|
.recvmsg = inet_recvmsg, /* ok */
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = sock_no_sendpage,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
static const struct net_proto_family inet6_family_ops = {
|
|
.family = PF_INET6,
|
|
.create = inet6_create,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
int inet6_register_protosw(struct inet_protosw *p)
|
|
{
|
|
struct list_head *lh;
|
|
struct inet_protosw *answer;
|
|
struct list_head *last_perm;
|
|
int protocol = p->protocol;
|
|
int ret;
|
|
|
|
spin_lock_bh(&inetsw6_lock);
|
|
|
|
ret = -EINVAL;
|
|
if (p->type >= SOCK_MAX)
|
|
goto out_illegal;
|
|
|
|
/* If we are trying to override a permanent protocol, bail. */
|
|
answer = NULL;
|
|
ret = -EPERM;
|
|
last_perm = &inetsw6[p->type];
|
|
list_for_each(lh, &inetsw6[p->type]) {
|
|
answer = list_entry(lh, struct inet_protosw, list);
|
|
|
|
/* Check only the non-wild match. */
|
|
if (INET_PROTOSW_PERMANENT & answer->flags) {
|
|
if (protocol == answer->protocol)
|
|
break;
|
|
last_perm = lh;
|
|
}
|
|
|
|
answer = NULL;
|
|
}
|
|
if (answer)
|
|
goto out_permanent;
|
|
|
|
/* Add the new entry after the last permanent entry if any, so that
|
|
* the new entry does not override a permanent entry when matched with
|
|
* a wild-card protocol. But it is allowed to override any existing
|
|
* non-permanent entry. This means that when we remove this entry, the
|
|
* system automatically returns to the old behavior.
|
|
*/
|
|
list_add_rcu(&p->list, last_perm);
|
|
ret = 0;
|
|
out:
|
|
spin_unlock_bh(&inetsw6_lock);
|
|
return ret;
|
|
|
|
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(inet6_register_protosw);
|
|
|
|
void
|
|
inet6_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(&inetsw6_lock);
|
|
list_del_rcu(&p->list);
|
|
spin_unlock_bh(&inetsw6_lock);
|
|
|
|
synchronize_net();
|
|
}
|
|
}
|
|
EXPORT_SYMBOL(inet6_unregister_protosw);
|
|
|
|
int inet6_sk_rebuild_header(struct sock *sk)
|
|
{
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
struct dst_entry *dst;
|
|
|
|
dst = __sk_dst_check(sk, np->dst_cookie);
|
|
|
|
if (!dst) {
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
struct in6_addr *final_p, final;
|
|
struct flowi6 fl6;
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
fl6.flowi6_proto = sk->sk_protocol;
|
|
fl6.daddr = sk->sk_v6_daddr;
|
|
fl6.saddr = np->saddr;
|
|
fl6.flowlabel = np->flow_label;
|
|
fl6.flowi6_oif = sk->sk_bound_dev_if;
|
|
fl6.flowi6_mark = sk->sk_mark;
|
|
fl6.fl6_dport = inet->inet_dport;
|
|
fl6.fl6_sport = inet->inet_sport;
|
|
security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
|
|
|
|
final_p = fl6_update_dst(&fl6, np->opt, &final);
|
|
|
|
dst = ip6_dst_lookup_flow(sk, &fl6, final_p);
|
|
if (IS_ERR(dst)) {
|
|
sk->sk_route_caps = 0;
|
|
sk->sk_err_soft = -PTR_ERR(dst);
|
|
return PTR_ERR(dst);
|
|
}
|
|
|
|
__ip6_dst_store(sk, dst, NULL, NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet6_sk_rebuild_header);
|
|
|
|
bool ipv6_opt_accepted(const struct sock *sk, const struct sk_buff *skb,
|
|
const struct inet6_skb_parm *opt)
|
|
{
|
|
const struct ipv6_pinfo *np = inet6_sk(sk);
|
|
|
|
if (np->rxopt.all) {
|
|
if ((opt->hop && (np->rxopt.bits.hopopts ||
|
|
np->rxopt.bits.ohopopts)) ||
|
|
(ip6_flowinfo((struct ipv6hdr *) skb_network_header(skb)) &&
|
|
np->rxopt.bits.rxflow) ||
|
|
(opt->srcrt && (np->rxopt.bits.srcrt ||
|
|
np->rxopt.bits.osrcrt)) ||
|
|
((opt->dst1 || opt->dst0) &&
|
|
(np->rxopt.bits.dstopts || np->rxopt.bits.odstopts)))
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
EXPORT_SYMBOL_GPL(ipv6_opt_accepted);
|
|
|
|
static struct packet_type ipv6_packet_type __read_mostly = {
|
|
.type = cpu_to_be16(ETH_P_IPV6),
|
|
.func = ipv6_rcv,
|
|
};
|
|
|
|
static int __init ipv6_packet_init(void)
|
|
{
|
|
dev_add_pack(&ipv6_packet_type);
|
|
return 0;
|
|
}
|
|
|
|
static void ipv6_packet_cleanup(void)
|
|
{
|
|
dev_remove_pack(&ipv6_packet_type);
|
|
}
|
|
|
|
static int __net_init ipv6_init_mibs(struct net *net)
|
|
{
|
|
int i;
|
|
|
|
net->mib.udp_stats_in6 = alloc_percpu(struct udp_mib);
|
|
if (!net->mib.udp_stats_in6)
|
|
return -ENOMEM;
|
|
net->mib.udplite_stats_in6 = alloc_percpu(struct udp_mib);
|
|
if (!net->mib.udplite_stats_in6)
|
|
goto err_udplite_mib;
|
|
net->mib.ipv6_statistics = alloc_percpu(struct ipstats_mib);
|
|
if (!net->mib.ipv6_statistics)
|
|
goto err_ip_mib;
|
|
|
|
for_each_possible_cpu(i) {
|
|
struct ipstats_mib *af_inet6_stats;
|
|
af_inet6_stats = per_cpu_ptr(net->mib.ipv6_statistics, i);
|
|
u64_stats_init(&af_inet6_stats->syncp);
|
|
}
|
|
|
|
|
|
net->mib.icmpv6_statistics = alloc_percpu(struct icmpv6_mib);
|
|
if (!net->mib.icmpv6_statistics)
|
|
goto err_icmp_mib;
|
|
net->mib.icmpv6msg_statistics = kzalloc(sizeof(struct icmpv6msg_mib),
|
|
GFP_KERNEL);
|
|
if (!net->mib.icmpv6msg_statistics)
|
|
goto err_icmpmsg_mib;
|
|
return 0;
|
|
|
|
err_icmpmsg_mib:
|
|
free_percpu(net->mib.icmpv6_statistics);
|
|
err_icmp_mib:
|
|
free_percpu(net->mib.ipv6_statistics);
|
|
err_ip_mib:
|
|
free_percpu(net->mib.udplite_stats_in6);
|
|
err_udplite_mib:
|
|
free_percpu(net->mib.udp_stats_in6);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static void ipv6_cleanup_mibs(struct net *net)
|
|
{
|
|
free_percpu(net->mib.udp_stats_in6);
|
|
free_percpu(net->mib.udplite_stats_in6);
|
|
free_percpu(net->mib.ipv6_statistics);
|
|
free_percpu(net->mib.icmpv6_statistics);
|
|
kfree(net->mib.icmpv6msg_statistics);
|
|
}
|
|
|
|
static int __net_init inet6_net_init(struct net *net)
|
|
{
|
|
int err = 0;
|
|
|
|
net->ipv6.sysctl.bindv6only = 0;
|
|
net->ipv6.sysctl.icmpv6_time = 1*HZ;
|
|
net->ipv6.sysctl.flowlabel_consistency = 1;
|
|
net->ipv6.sysctl.auto_flowlabels = 0;
|
|
net->ipv6.sysctl.idgen_retries = 3;
|
|
net->ipv6.sysctl.idgen_delay = 1 * HZ;
|
|
net->ipv6.sysctl.flowlabel_state_ranges = 1;
|
|
atomic_set(&net->ipv6.fib6_sernum, 1);
|
|
|
|
err = ipv6_init_mibs(net);
|
|
if (err)
|
|
return err;
|
|
#ifdef CONFIG_PROC_FS
|
|
err = udp6_proc_init(net);
|
|
if (err)
|
|
goto out;
|
|
err = tcp6_proc_init(net);
|
|
if (err)
|
|
goto proc_tcp6_fail;
|
|
err = ac6_proc_init(net);
|
|
if (err)
|
|
goto proc_ac6_fail;
|
|
#endif
|
|
return err;
|
|
|
|
#ifdef CONFIG_PROC_FS
|
|
proc_ac6_fail:
|
|
tcp6_proc_exit(net);
|
|
proc_tcp6_fail:
|
|
udp6_proc_exit(net);
|
|
out:
|
|
ipv6_cleanup_mibs(net);
|
|
return err;
|
|
#endif
|
|
}
|
|
|
|
static void __net_exit inet6_net_exit(struct net *net)
|
|
{
|
|
#ifdef CONFIG_PROC_FS
|
|
udp6_proc_exit(net);
|
|
tcp6_proc_exit(net);
|
|
ac6_proc_exit(net);
|
|
#endif
|
|
ipv6_cleanup_mibs(net);
|
|
}
|
|
|
|
static struct pernet_operations inet6_net_ops = {
|
|
.init = inet6_net_init,
|
|
.exit = inet6_net_exit,
|
|
};
|
|
|
|
static const struct ipv6_stub ipv6_stub_impl = {
|
|
.ipv6_sock_mc_join = ipv6_sock_mc_join,
|
|
.ipv6_sock_mc_drop = ipv6_sock_mc_drop,
|
|
.ipv6_dst_lookup = ip6_dst_lookup,
|
|
.udpv6_encap_enable = udpv6_encap_enable,
|
|
.ndisc_send_na = ndisc_send_na,
|
|
.nd_tbl = &nd_tbl,
|
|
};
|
|
|
|
static int __init inet6_init(void)
|
|
{
|
|
struct list_head *r;
|
|
int err = 0;
|
|
|
|
sock_skb_cb_check_size(sizeof(struct inet6_skb_parm));
|
|
|
|
/* Register the socket-side information for inet6_create. */
|
|
for (r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
|
|
INIT_LIST_HEAD(r);
|
|
|
|
if (disable_ipv6_mod) {
|
|
pr_info("Loaded, but administratively disabled, reboot required to enable\n");
|
|
goto out;
|
|
}
|
|
|
|
err = proto_register(&tcpv6_prot, 1);
|
|
if (err)
|
|
goto out;
|
|
|
|
err = proto_register(&udpv6_prot, 1);
|
|
if (err)
|
|
goto out_unregister_tcp_proto;
|
|
|
|
err = proto_register(&udplitev6_prot, 1);
|
|
if (err)
|
|
goto out_unregister_udp_proto;
|
|
|
|
err = proto_register(&rawv6_prot, 1);
|
|
if (err)
|
|
goto out_unregister_udplite_proto;
|
|
|
|
err = proto_register(&pingv6_prot, 1);
|
|
if (err)
|
|
goto out_unregister_ping_proto;
|
|
|
|
/* We MUST register RAW sockets before we create the ICMP6,
|
|
* IGMP6, or NDISC control sockets.
|
|
*/
|
|
err = rawv6_init();
|
|
if (err)
|
|
goto out_unregister_raw_proto;
|
|
|
|
/* Register the family here so that the init calls below will
|
|
* be able to create sockets. (?? is this dangerous ??)
|
|
*/
|
|
err = sock_register(&inet6_family_ops);
|
|
if (err)
|
|
goto out_sock_register_fail;
|
|
|
|
/*
|
|
* ipngwg API draft makes clear that the correct semantics
|
|
* for TCP and UDP is to consider one TCP and UDP instance
|
|
* in a host available by both INET and INET6 APIs and
|
|
* able to communicate via both network protocols.
|
|
*/
|
|
|
|
err = register_pernet_subsys(&inet6_net_ops);
|
|
if (err)
|
|
goto register_pernet_fail;
|
|
err = icmpv6_init();
|
|
if (err)
|
|
goto icmp_fail;
|
|
err = ip6_mr_init();
|
|
if (err)
|
|
goto ipmr_fail;
|
|
err = ndisc_init();
|
|
if (err)
|
|
goto ndisc_fail;
|
|
err = igmp6_init();
|
|
if (err)
|
|
goto igmp_fail;
|
|
|
|
ipv6_stub = &ipv6_stub_impl;
|
|
|
|
err = ipv6_netfilter_init();
|
|
if (err)
|
|
goto netfilter_fail;
|
|
/* Create /proc/foo6 entries. */
|
|
#ifdef CONFIG_PROC_FS
|
|
err = -ENOMEM;
|
|
if (raw6_proc_init())
|
|
goto proc_raw6_fail;
|
|
if (udplite6_proc_init())
|
|
goto proc_udplite6_fail;
|
|
if (ipv6_misc_proc_init())
|
|
goto proc_misc6_fail;
|
|
if (if6_proc_init())
|
|
goto proc_if6_fail;
|
|
#endif
|
|
err = ip6_route_init();
|
|
if (err)
|
|
goto ip6_route_fail;
|
|
err = ndisc_late_init();
|
|
if (err)
|
|
goto ndisc_late_fail;
|
|
err = ip6_flowlabel_init();
|
|
if (err)
|
|
goto ip6_flowlabel_fail;
|
|
err = addrconf_init();
|
|
if (err)
|
|
goto addrconf_fail;
|
|
|
|
/* Init v6 extension headers. */
|
|
err = ipv6_exthdrs_init();
|
|
if (err)
|
|
goto ipv6_exthdrs_fail;
|
|
|
|
err = ipv6_frag_init();
|
|
if (err)
|
|
goto ipv6_frag_fail;
|
|
|
|
/* Init v6 transport protocols. */
|
|
err = udpv6_init();
|
|
if (err)
|
|
goto udpv6_fail;
|
|
|
|
err = udplitev6_init();
|
|
if (err)
|
|
goto udplitev6_fail;
|
|
|
|
err = tcpv6_init();
|
|
if (err)
|
|
goto tcpv6_fail;
|
|
|
|
err = ipv6_packet_init();
|
|
if (err)
|
|
goto ipv6_packet_fail;
|
|
|
|
err = pingv6_init();
|
|
if (err)
|
|
goto pingv6_fail;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
err = ipv6_sysctl_register();
|
|
if (err)
|
|
goto sysctl_fail;
|
|
#endif
|
|
out:
|
|
return err;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
sysctl_fail:
|
|
pingv6_exit();
|
|
#endif
|
|
pingv6_fail:
|
|
ipv6_packet_cleanup();
|
|
ipv6_packet_fail:
|
|
tcpv6_exit();
|
|
tcpv6_fail:
|
|
udplitev6_exit();
|
|
udplitev6_fail:
|
|
udpv6_exit();
|
|
udpv6_fail:
|
|
ipv6_frag_exit();
|
|
ipv6_frag_fail:
|
|
ipv6_exthdrs_exit();
|
|
ipv6_exthdrs_fail:
|
|
addrconf_cleanup();
|
|
addrconf_fail:
|
|
ip6_flowlabel_cleanup();
|
|
ip6_flowlabel_fail:
|
|
ndisc_late_cleanup();
|
|
ndisc_late_fail:
|
|
ip6_route_cleanup();
|
|
ip6_route_fail:
|
|
#ifdef CONFIG_PROC_FS
|
|
if6_proc_exit();
|
|
proc_if6_fail:
|
|
ipv6_misc_proc_exit();
|
|
proc_misc6_fail:
|
|
udplite6_proc_exit();
|
|
proc_udplite6_fail:
|
|
raw6_proc_exit();
|
|
proc_raw6_fail:
|
|
#endif
|
|
ipv6_netfilter_fini();
|
|
netfilter_fail:
|
|
igmp6_cleanup();
|
|
igmp_fail:
|
|
ndisc_cleanup();
|
|
ndisc_fail:
|
|
ip6_mr_cleanup();
|
|
ipmr_fail:
|
|
icmpv6_cleanup();
|
|
icmp_fail:
|
|
unregister_pernet_subsys(&inet6_net_ops);
|
|
register_pernet_fail:
|
|
sock_unregister(PF_INET6);
|
|
rtnl_unregister_all(PF_INET6);
|
|
out_sock_register_fail:
|
|
rawv6_exit();
|
|
out_unregister_ping_proto:
|
|
proto_unregister(&pingv6_prot);
|
|
out_unregister_raw_proto:
|
|
proto_unregister(&rawv6_prot);
|
|
out_unregister_udplite_proto:
|
|
proto_unregister(&udplitev6_prot);
|
|
out_unregister_udp_proto:
|
|
proto_unregister(&udpv6_prot);
|
|
out_unregister_tcp_proto:
|
|
proto_unregister(&tcpv6_prot);
|
|
goto out;
|
|
}
|
|
module_init(inet6_init);
|
|
|
|
MODULE_ALIAS_NETPROTO(PF_INET6);
|