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| author |   Maciej Żenczykowski <maze@google.com> | 2017-09-26 21:32:42 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-09-30 05:30:52 +0100 |
| commit | 84e14fe353de7624872e582887712079ba0b2d56 (patch) | |
| tree | 8e417422256f2b25f0a593874b6d8b3b384ff399 /include/uapi/linux/in6.h | |
| parent | net: ipv6: send NS for DAD when link operationally up (diff) | |
| download | linux-dev-84e14fe353de7624872e582887712079ba0b2d56.tar.xz linux-dev-84e14fe353de7624872e582887712079ba0b2d56.zip | |
net-ipv6: add support for sockopt(SOL_IPV6, IPV6_FREEBIND)
So far we've been relying on sockopt(SOL_IP, IP_FREEBIND) being usable
even on IPv6 sockets.
However, it turns out it is perfectly reasonable to want to set freebind
on an AF_INET6 SOCK_RAW socket - but there is no way to set any SOL_IP
socket option on such a socket (they're all blindly errored out).
One use case for this is to allow spoofing src ip on a raw socket
via sendmsg cmsg.
Tested:
built, and booted
# python
>>> import socket
>>> SOL_IP = socket.SOL_IP
>>> SOL_IPV6 = socket.IPPROTO_IPV6
>>> IP_FREEBIND = 15
>>> IPV6_FREEBIND = 78
>>> s = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM, 0)
>>> s.getsockopt(SOL_IP, IP_FREEBIND)
0
>>> s.getsockopt(SOL_IPV6, IPV6_FREEBIND)
0
>>> s.setsockopt(SOL_IPV6, IPV6_FREEBIND, 1)
>>> s.getsockopt(SOL_IP, IP_FREEBIND)
1
>>> s.getsockopt(SOL_IPV6, IPV6_FREEBIND)
1
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/uapi/linux/in6.h')
| -rw-r--r-- | include/uapi/linux/in6.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/in6.h b/include/uapi/linux/in6.h index 46444f8fbee4..4f8f3eb0699f 100644 --- a/include/uapi/linux/in6.h +++ b/include/uapi/linux/in6.h @@ -284,6 +284,7 @@ struct in6_flowlabel_req { #define IPV6_TRANSPARENT 75 #define IPV6_UNICAST_IF 76 #define IPV6_RECVFRAGSIZE 77 +#define IPV6_FREEBIND 78 /* * Multicast Routing: |