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alistair23-linux/net/ipv6/af_inet6.c
Tom Herbert 47d3d7ac65 ipv6: Implement limits on Hop-by-Hop and Destination options 
RFC 8200 (IPv6) defines Hop-by-Hop options and Destination options
extension headers. Both of these carry a list of TLVs which is
only limited by the maximum length of the extension header (2048
bytes). By the spec a host must process all the TLVs in these
options, however these could be used as a fairly obvious
denial of service attack. I think this could in fact be
a significant DOS vector on the Internet, one mitigating
factor might be that many FWs drop all packets with EH (and
obviously this is only IPv6) so an Internet wide attack might not
be so effective (yet!).

By my calculation, the worse case packet with TLVs in a standard
1500 byte MTU packet that would be processed by the stack contains
1282 invidual TLVs (including pad TLVS) or 724 two byte TLVs. I
wrote a quick test program that floods a whole bunch of these
packets to a host and sure enough there is substantial time spent
in ip6_parse_tlv. These packets contain nothing but unknown TLVS
(that are ignored), TLV padding, and bogus UDP header with zero
payload length.

  25.38%  [kernel]                    [k] __fib6_clean_all
  21.63%  [kernel]                    [k] ip6_parse_tlv
   4.21%  [kernel]                    [k] __local_bh_enable_ip
   2.18%  [kernel]                    [k] ip6_pol_route.isra.39
   1.98%  [kernel]                    [k] fib6_walk_continue
   1.88%  [kernel]                    [k] _raw_write_lock_bh
   1.65%  [kernel]                    [k] dst_release

This patch adds configurable limits to Destination and Hop-by-Hop
options. There are three limits that may be set:
  - Limit the number of options in a Hop-by-Hop or Destination options
    extension header.
  - Limit the byte length of a Hop-by-Hop or Destination options
    extension header.
  - Disallow unrecognized options in a Hop-by-Hop or Destination
    options extension header.

The limits are set in corresponding sysctls:

  ipv6.sysctl.max_dst_opts_cnt
  ipv6.sysctl.max_hbh_opts_cnt
  ipv6.sysctl.max_dst_opts_len
  ipv6.sysctl.max_hbh_opts_len

If a max_*_opts_cnt is less than zero then unknown TLVs are disallowed.
The number of known TLVs that are allowed is the absolute value of
this number.

If a limit is exceeded when processing an extension header the packet is
dropped.

Default values are set to 8 for options counts, and set to INT_MAX
for maximum length. Note the choice to limit options to 8 is an
arbitrary guess (roughly based on the fact that the stack supports
three HBH options and just one destination option).

These limits have being proposed in draft-ietf-6man-rfc6434-bis.

Tested (by Martin Lau)

I tested out 1 thread (i.e. one raw_udp process).

I changed the net.ipv6.max_dst_(opts|hbh)_number between 8 to 2048.
With sysctls setting to 2048, the softirq% is packed to 100%.
With 8, the softirq% is almost unnoticable from mpstat.

v2;
  - Code and documention cleanup.
  - Change references of RFC2460 to be RFC8200.
  - Add reference to RFC6434-bis where the limits will be in standard.

Signed-off-by: Tom Herbert <tom@quantonium.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-11-03 09:50:22 +09:00

1103 lines
26 KiB
C
Raw Blame History

/*
* PF_INET6 socket protocol family
* Linux INET6 implementation
*
* Authors:
* Pedro Roque <roque@di.fc.ul.pt>
*
* Adapted from linux/net/ipv4/af_inet.c
*
* Fixes:
* piggy, Karl Knutson : Socket protocol table
* Hideaki YOSHIFUJI : sin6_scope_id support
* Arnaldo Melo : check proc_net_create return, cleanups
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#define pr_fmt(fmt) "IPv6: " fmt
#include <linux/module.h>
#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/sockios.h>
#include <linux/net.h>
#include <linux/fcntl.h>
#include <linux/mm.h>
#include <linux/interrupt.h>
#include <linux/proc_fs.h>
#include <linux/stat.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/inet.h>
#include <linux/netdevice.h>
#include <linux/icmpv6.h>
#include <linux/netfilter_ipv6.h>
#include <net/ip.h>
#include <net/ipv6.h>
#include <net/udp.h>
#include <net/udplite.h>
#include <net/tcp.h>
#include <net/ping.h>
#include <net/protocol.h>
#include <net/inet_common.h>
#include <net/route.h>
#include <net/transp_v6.h>
#include <net/ip6_route.h>
#include <net/addrconf.h>
#include <net/ndisc.h>
#ifdef CONFIG_IPV6_TUNNEL
#include <net/ip6_tunnel.h>
#endif
#include <net/calipso.h>
#include <net/seg6.h>
#include <linux/uaccess.h>
#include <linux/mroute6.h>
#include "ip6_offload.h"
MODULE_AUTHOR("Cast of dozens");
MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
MODULE_LICENSE("GPL");
/* The inetsw6 table contains everything that inet6_create needs to
* build a new socket.
*/
static struct list_head inetsw6[SOCK_MAX];
static DEFINE_SPINLOCK(inetsw6_lock);
struct ipv6_params ipv6_defaults = {
.disable_ipv6 = 0,
.autoconf = 1,
};
static int disable_ipv6_mod;
module_param_named(disable, disable_ipv6_mod, int, 0444);
MODULE_PARM_DESC(disable, "Disable IPv6 module such that it is non-functional");
module_param_named(disable_ipv6, ipv6_defaults.disable_ipv6, int, 0444);
MODULE_PARM_DESC(disable_ipv6, "Disable IPv6 on all interfaces");
module_param_named(autoconf, ipv6_defaults.autoconf, int, 0444);
MODULE_PARM_DESC(autoconf, "Enable IPv6 address autoconfiguration on all interfaces");
bool ipv6_mod_enabled(void)
{
return disable_ipv6_mod == 0;
}
EXPORT_SYMBOL_GPL(ipv6_mod_enabled);
static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
{
const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);
return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
}
static int inet6_create(struct net *net, struct socket *sock, int protocol,
int kern)
{
struct inet_sock *inet;
struct ipv6_pinfo *np;
struct sock *sk;
struct inet_protosw *answer;
struct proto *answer_prot;
unsigned char answer_flags;
int try_loading_module = 0;
int err;
if (protocol < 0 || protocol >= IPPROTO_MAX)
return -EINVAL;
/* Look for the requested type/protocol pair. */
lookup_protocol:
err = -ESOCKTNOSUPPORT;
rcu_read_lock();
list_for_each_entry_rcu(answer, &inetsw6[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 (err) {
if (try_loading_module < 2) {
rcu_read_unlock();
/*
* Be more specific, e.g. net-pf-10-proto-132-type-1
* (net-pf-PF_INET6-proto-IPPROTO_SCTP-type-SOCK_STREAM)
*/
if (++try_loading_module == 1)
request_module("net-pf-%d-proto-%d-type-%d",
PF_INET6, protocol, sock->type);
/*
* Fall back to generic, e.g. net-pf-10-proto-132
* (net-pf-PF_INET6-proto-IPPROTO_SCTP)
*/
else
request_module("net-pf-%d-proto-%d",
PF_INET6, protocol);
goto lookup_protocol;
} else
goto out_rcu_unlock;
}
err = -EPERM;
if (sock->type == SOCK_RAW && !kern &&
!ns_capable(net->user_ns, CAP_NET_RAW))
goto out_rcu_unlock;
sock->ops = answer->ops;
answer_prot = answer->prot;
answer_flags = answer->flags;
rcu_read_unlock();
WARN_ON(!answer_prot->slab);
err = -ENOBUFS;
sk = sk_alloc(net, PF_INET6, GFP_KERNEL, answer_prot, kern);
if (!sk)
goto out;
sock_init_data(sock, sk);
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;
if (SOCK_RAW == sock->type) {
inet->inet_num = protocol;
if (IPPROTO_RAW == protocol)
inet->hdrincl = 1;
}
sk->sk_destruct = inet_sock_destruct;
sk->sk_family = PF_INET6;
sk->sk_protocol = protocol;
sk->sk_backlog_rcv = answer->prot->backlog_rcv;
inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
np->hop_limit = -1;
np->mcast_hops = IPV6_DEFAULT_MCASTHOPS;
np->mc_loop = 1;
np->pmtudisc = IPV6_PMTUDISC_WANT;
np->autoflowlabel = ip6_default_np_autolabel(net);
np->repflow = net->ipv6.sysctl.flowlabel_reflect;
sk->sk_ipv6only = net->ipv6.sysctl.bindv6only;
/* Init the ipv4 part of the socket since we can have sockets
* using v6 API for ipv4.
*/
inet->uc_ttl = -1;
inet->mc_loop = 1;
inet->mc_ttl = 1;
inet->mc_index = 0;
inet->mc_list = NULL;
inet->rcv_tos = 0;
if (net->ipv4.sysctl_ip_no_pmtu_disc)
inet->pmtudisc = IP_PMTUDISC_DONT;
else
inet->pmtudisc = IP_PMTUDISC_WANT;
/*
* Increment only the relevant sk_prot->socks debug field, this changes
* the previous behaviour of incrementing both the equivalent to
* answer->prot->socks (inet6_sock_nr) and inet_sock_nr.
*
* This allows better debug granularity as we'll know exactly how many
* UDPv6, TCPv6, etc socks were allocated, not the sum of all IPv6
* transport protocol socks. -acme
*/
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);
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;
}
/* bind for INET6 API */
int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
{
struct sockaddr_in6 *addr = (struct sockaddr_in6 *)uaddr;
struct sock *sk = sock->sk;
struct inet_sock *inet = inet_sk(sk);
struct ipv6_pinfo *np = inet6_sk(sk);
struct net *net = sock_net(sk);
__be32 v4addr = 0;
unsigned short snum;
int addr_type = 0;
int err = 0;
/* If the socket has its own bind function then use it. */
if (sk->sk_prot->bind)
return sk->sk_prot->bind(sk, uaddr, addr_len);
if (addr_len < SIN6_LEN_RFC2133)
return -EINVAL;
if (addr->sin6_family != AF_INET6)
return -EAFNOSUPPORT;
addr_type = ipv6_addr_type(&addr->sin6_addr);
if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
return -EINVAL;
snum = ntohs(addr->sin6_port);
if (snum && snum < inet_prot_sock(net) &&
!ns_capable(net->user_ns, CAP_NET_BIND_SERVICE))
return -EACCES;
lock_sock(sk);
/* Check these errors (active socket, double bind). */
if (sk->sk_state != TCP_CLOSE || inet->inet_num) {
err = -EINVAL;
goto out;
}
/* Check if the address belongs to the host. */
if (addr_type == IPV6_ADDR_MAPPED) {
int chk_addr_ret;
/* Binding to v4-mapped address on a v6-only socket
* makes no sense
*/
if (sk->sk_ipv6only) {
err = -EINVAL;
goto out;
}
/* Reproduce AF_INET checks to make the bindings consistent */
v4addr = addr->sin6_addr.s6_addr32[3];
chk_addr_ret = inet_addr_type(net, v4addr);
if (!net->ipv4.sysctl_ip_nonlocal_bind &&
!(inet->freebind || inet->transparent) &&
v4addr != htonl(INADDR_ANY) &&
chk_addr_ret != RTN_LOCAL &&
chk_addr_ret != RTN_MULTICAST &&
chk_addr_ret != RTN_BROADCAST) {
err = -EADDRNOTAVAIL;
goto out;
}
} else {
if (addr_type != IPV6_ADDR_ANY) {
struct net_device *dev = NULL;
rcu_read_lock();
if (__ipv6_addr_needs_scope_id(addr_type)) {
if (addr_len >= sizeof(struct sockaddr_in6) &&
addr->sin6_scope_id) {
/* Override any existing binding, if another one
* is supplied by user.
*/
sk->sk_bound_dev_if = addr->sin6_scope_id;
}
/* Binding to link-local address requires an interface */
if (!sk->sk_bound_dev_if) {
err = -EINVAL;
goto out_unlock;
}
dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
if (!dev) {
err = -ENODEV;
goto out_unlock;
}
}
/* ipv4 addr of the socket is invalid. Only the
* unspecified and mapped address have a v4 equivalent.
*/
v4addr = LOOPBACK4_IPV6;
if (!(addr_type & IPV6_ADDR_MULTICAST)) {
if (!net->ipv6.sysctl.ip_nonlocal_bind &&
!(inet->freebind || inet->transparent) &&
!ipv6_chk_addr(net, &addr->sin6_addr,
dev, 0)) {
err = -EADDRNOTAVAIL;
goto out_unlock;
}
}
rcu_read_unlock();
}
}
inet->inet_rcv_saddr = v4addr;
inet->inet_saddr = v4addr;
sk->sk_v6_rcv_saddr = addr->sin6_addr;
if (!(addr_type & IPV6_ADDR_MULTICAST))
np->saddr = addr->sin6_addr;
/* Make sure we are allowed to bind here. */
if ((snum || !inet->bind_address_no_port) &&
sk->sk_prot->get_port(sk, snum)) {
inet_reset_saddr(sk);
err = -EADDRINUSE;
goto out;
}
if (addr_type != IPV6_ADDR_ANY) {
sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
if (addr_type != IPV6_ADDR_MAPPED)
sk->sk_ipv6only = 1;
}
if (snum)
sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
inet->inet_sport = htons(inet->inet_num);
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((__force struct ipv6_txoptions **)&np->opt, NULL);
if (opt) {
atomic_sub(opt->tot_len, &sk->sk_omem_alloc);
txopt_put(opt);
}
}
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,
.sendmsg_locked = tcp_sendmsg_locked,
.sendpage_locked = tcp_sendpage_locked,
.splice_read = tcp_splice_read,
.read_sock = tcp_read_sock,
.peek_len = tcp_peek_len,
#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,
.set_peek_off = sk_set_peek_off,
#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;
fl6.flowi6_uid = sk->sk_uid;
security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
rcu_read_lock();
final_p = fl6_update_dst(&fl6, rcu_dereference(np->opt),
&final);
rcu_read_unlock();
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->flags & IP6SKB_HOPBYHOP) &&
(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 = IP6_DEFAULT_AUTO_FLOW_LABELS;
net->ipv6.sysctl.idgen_retries = 3;
net->ipv6.sysctl.idgen_delay = 1 * HZ;
net->ipv6.sysctl.flowlabel_state_ranges = 0;
net->ipv6.sysctl.max_dst_opts_cnt = IP6_DEFAULT_MAX_DST_OPTS_CNT;
net->ipv6.sysctl.max_hbh_opts_cnt = IP6_DEFAULT_MAX_HBH_OPTS_CNT;
net->ipv6.sysctl.max_dst_opts_len = IP6_DEFAULT_MAX_DST_OPTS_LEN;
net->ipv6.sysctl.max_hbh_opts_len = IP6_DEFAULT_MAX_HBH_OPTS_LEN;
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 = ip6_mr_init();
if (err)
goto ipmr_fail;
err = icmpv6_init();
if (err)
goto icmp_fail;
err = ndisc_init();
if (err)
goto ndisc_fail;
err = igmp6_init();
if (err)
goto igmp_fail;
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 = udpv6_offload_init();
if (err)
goto udpv6_offload_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;
err = calipso_init();
if (err)
goto calipso_fail;
err = seg6_init();
if (err)
goto seg6_fail;
err = igmp6_late_init();
if (err)
goto igmp6_late_err;
#ifdef CONFIG_SYSCTL
err = ipv6_sysctl_register();
if (err)
goto sysctl_fail;
#endif
/* ensure that ipv6 stubs are visible only after ipv6 is ready */
wmb();
ipv6_stub = &ipv6_stub_impl;
out:
return err;
#ifdef CONFIG_SYSCTL
sysctl_fail:
igmp6_late_cleanup();
#endif
igmp6_late_err:
seg6_exit();
seg6_fail:
calipso_exit();
calipso_fail:
pingv6_exit();
pingv6_fail:
ipv6_packet_cleanup();
ipv6_packet_fail:
tcpv6_exit();
tcpv6_fail:
udpv6_offload_exit();
udpv6_offload_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();
icmp_fail:
unregister_pernet_subsys(&inet6_net_ops);
ipmr_fail:
icmpv6_cleanup();
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);
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