Xin Long 8c22dab03a ip6_tunnel: do not allow loading ip6_tunnel if ipv6 is disabled in cmdline ...

If ipv6 has been disabled from cmdline since kernel started, it makes
no sense to allow users to create any ip6 tunnel. Otherwise, it could
some potential problem.

Jianlin found a kernel crash caused by this in ip6_gre when he set
ipv6.disable=1 in grub:

[  209.588865] Unable to handle kernel paging request for data at address 0x00000080
[  209.588872] Faulting instruction address: 0xc000000000a3aa6c
[  209.588879] Oops: Kernel access of bad area, sig: 11 [#1]
[  209.589062] NIP [c000000000a3aa6c] fib_rules_lookup+0x4c/0x260
[  209.589071] LR [c000000000b9ad90] fib6_rule_lookup+0x50/0xb0
[  209.589076] Call Trace:
[  209.589097] fib6_rule_lookup+0x50/0xb0
[  209.589106] rt6_lookup+0xc4/0x110
[  209.589116] ip6gre_tnl_link_config+0x214/0x2f0 [ip6_gre]
[  209.589125] ip6gre_newlink+0x138/0x3a0 [ip6_gre]
[  209.589134] rtnl_newlink+0x798/0xb80
[  209.589142] rtnetlink_rcv_msg+0xec/0x390
[  209.589151] netlink_rcv_skb+0x138/0x150
[  209.589159] rtnetlink_rcv+0x48/0x70
[  209.589169] netlink_unicast+0x538/0x640
[  209.589175] netlink_sendmsg+0x40c/0x480
[  209.589184] ___sys_sendmsg+0x384/0x4e0
[  209.589194] SyS_sendmsg+0xd4/0x140
[  209.589201] SyS_socketcall+0x3e0/0x4f0
[  209.589209] system_call+0x38/0xe0

This patch is to return -EOPNOTSUPP in ip6_tunnel_init if ipv6 has been
disabled from cmdline.

Reported-by: Jianlin Shi <jishi@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2017-09-18 16:34:32 -07:00

..

ila

netfilter: nf_hook_ops structs can be const

2017-07-31 19:10:44 +02:00

netfilter

netfilter: xtables: add scheduling opportunity in get_counters

2017-09-08 18:55:27 +02:00

addrconf_core.c

Ipvlan should return an error when an address is already in use.

2017-06-09 12:26:07 -04:00

addrconf.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2017-09-01 17:42:05 -07:00

addrlabel.c

addrlabel: add/delete/get can run without rtnl

2017-08-29 09:41:56 -07:00

af_inet6.c

ipv6: Add sysctl for per namespace flow label reflection

2017-08-24 18:05:43 -07:00

ah6.c

Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next

2017-06-23 14:17:31 -04:00

anycast.c

net, ipv6: convert ifacaddr6.aca_refcnt from atomic_t to refcount_t

2017-07-04 01:29:04 -07:00

calipso.c

net, calipso: convert calipso_doi.refcount from atomic_t to refcount_t

2017-07-04 22:35:16 +01:00

datagram.c

net: convert sock.sk_refcnt from atomic_t to refcount_t

2017-07-01 07:39:08 -07:00

esp6_offload.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2017-09-01 17:42:05 -07:00

esp6.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2017-09-01 17:42:05 -07:00

exthdrs_core.c

…

exthdrs_offload.c

…

exthdrs.c

ipv6: sr: allow SRH insertion with arbitrary segments_left value

2017-08-07 14:16:21 -07:00

fib6_notifier.c

net: Add module reference to FIB notifiers

2017-09-01 20:33:42 -07:00

fib6_rules.c

net: ipv6: avoid overhead when no custom FIB rules are installed

2017-08-08 21:40:08 -07:00

fou6.c

…

icmp.c

ipv6: Use rt6i_idev index for echo replies to a local address

2017-08-29 15:32:25 -07:00

inet6_connection_sock.c

…

inet6_hashtables.c

net: ipv6: add second dif to inet6 socket lookups

2017-08-07 11:39:22 -07:00

ip6_checksum.c

…

ip6_fib.c

ipv6: fix typo in fib6_net_exit()

2017-09-08 16:09:04 -07:00

ip6_flowlabel.c

…

ip6_gre.c

ip6_gre: skb_push ipv6hdr before packing the header in ip6gre_header

2017-09-18 14:50:45 -07:00

ip6_icmp.c

…

ip6_input.c

…

ip6_offload.c

…

ip6_offload.h

…

ip6_output.c

udp: consistently apply ufo or fragmentation

2017-08-10 09:52:12 -07:00

ip6_tunnel.c

ip6_tunnel: do not allow loading ip6_tunnel if ipv6 is disabled in cmdline

2017-09-18 16:34:32 -07:00

ip6_udp_tunnel.c

…

ip6_vti.c

vti: revert flush x-netns xfrm cache when vti interface is removed

2017-07-18 11:13:41 -07:00

ip6mr.c

rtnetlink: make rtnl_register accept a flags parameter

2017-08-09 16:57:38 -07:00

ipcomp6.c

…

ipv6_sockglue.c

ipv6: do not set sk_destruct in IPV6_ADDRFORM sockopt

2017-08-29 10:54:40 -07:00

Kconfig

ipv6: sr: add helper functions for seg6local

2017-08-25 17:10:24 -07:00

Makefile

ipv6: sr: define core operations for seg6local lightweight tunnel

2017-08-07 14:16:22 -07:00

mcast_snoop.c

…

mcast.c

net, ipv6: convert ifmcaddr6.mca_refcnt from atomic_t to refcount_t

2017-07-04 01:29:04 -07:00

mip6.c

…

ndisc.c

neigh: increase queue_len_bytes to match wmem_default

2017-08-29 16:10:50 -07:00

netfilter.c

…

output_core.c

ipv6: accept 64k - 1 packet length in ip6_find_1stfragopt()

2017-08-22 10:23:26 -07:00

ping.c

…

proc.c

proc: snmp6: Use correct type in memset

2017-06-12 09:53:14 -04:00

protocol.c

…

raw.c

net: ipv6: add second dif to raw socket lookups

2017-08-07 11:39:22 -07:00

reassembly.c

Revert "net: fix percpu memory leaks"

2017-09-03 11:01:05 -07:00

route.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2017-09-01 17:42:05 -07:00

seg6_hmac.c

ipv6: sr: Use ARRAY_SIZE macro

2017-09-01 18:35:23 -07:00

seg6_iptunnel.c

ipv6: sr: add support for encapsulation of L2 frames

2017-08-25 17:10:23 -07:00

seg6_local.c

ipv6: sr: remove duplicate routing header type check

2017-09-11 14:34:10 -07:00

seg6.c

ipv6: sr: define core operations for seg6local lightweight tunnel

2017-08-07 14:16:22 -07:00

sit.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2017-06-30 12:43:08 -04:00

syncookies.c

ipv4: ipv6: initialize treq->txhash in cookie_v[46]_check()

2017-07-18 11:22:51 -07:00

sysctl_net_ipv6.c

ipv6: Add sysctl for per namespace flow label reflection

2017-08-24 18:05:43 -07:00

tcp_ipv6.c

tcp: fix a request socket leak

2017-09-08 16:07:17 -07:00

tcpv6_offload.c

…

tunnel6.c

…

udp_impl.h

…

udp_offload.c

net: avoid skb_warn_bad_offload false positives on UFO

2017-08-08 21:39:01 -07:00

udp.c

udpv6: Fix the checksum computation when HW checksum does not apply

2017-09-18 11:43:03 -07:00

udplite.c

…

xfrm6_input.c

xfrm6: Fix CHECKSUM_COMPLETE after IPv6 header push

2017-08-02 11:00:15 +02:00

xfrm6_mode_beet.c

networking: make skb_pull & friends return void pointers

2017-06-16 11:48:39 -04:00

xfrm6_mode_ro.c

…

xfrm6_mode_transport.c

…

xfrm6_mode_tunnel.c

…

xfrm6_output.c

…

xfrm6_policy.c

net: xfrm: support setting an output mark.

2017-08-11 07:03:00 +02:00

xfrm6_protocol.c

…

xfrm6_state.c

…

xfrm6_tunnel.c

net, ipv6: convert xfrm6_tunnel_spi.refcnt from atomic_t to refcount_t

2017-07-04 01:29:04 -07:00