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ipv6 RAW: Disallow IPPROTO_IPV6-level IPV6_CHECKSUM socket option on ICMPv6 sockets.

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RFC3542 tells that IPV6_CHECKSUM socket option in the IPPROTO_IPV6
level is not allowed on ICMPv6 sockets.  IPPROTO_RAW level
IPV6_CHECKSUM socket option (a Linux extension) is still allowed.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki 2008-04-24 21:30:38 -07:00 committed by David S. Miller
parent 8d390efd90
commit 1a98d05f59
1 changed files with 18 additions and 0 deletions
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18
net/ipv6/raw.c
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@ -971,6 +971,19 @@ static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
switch (optname) {
case IPV6_CHECKSUM:
if (inet_sk(sk)->num == IPPROTO_ICMPV6 &&
level == IPPROTO_IPV6) {
/*
* RFC3542 tells that IPV6_CHECKSUM socket
* option in the IPPROTO_IPV6 level is not
* allowed on ICMPv6 sockets.
* If you want to set it, use IPPROTO_RAW
* level IPV6_CHECKSUM socket option
* (Linux extension).
*/
return -EINVAL;
}
/* You may get strange result with a positive odd offset;
RFC2292bis agrees with me. */
if (val > 0 && (val&1))
@ -1046,6 +1059,11 @@ static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
switch (optname) {
case IPV6_CHECKSUM:
/*
* We allow getsockopt() for IPPROTO_IPV6-level
* IPV6_CHECKSUM socket option on ICMPv6 sockets
* since RFC3542 is silent about it.
*/
if (rp->checksum == 0)
val = -1;
else