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| author | Shan Wei <shanwei@cn.fujitsu.com> | 2008-06-19 16:29:39 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-06-19 16:29:39 -0700 |
| commit | aea7427f70cce5fa8f99ce447b213e9e3b49f24c (patch) | |
| tree | cf247ed4683d498ed7c067da7e6ef315ad97f3ff /net | |
| parent | ef3a62d272f033989e83eb1f26505f93f93e3e69 (diff) | |
| download | linux-aea7427f70cce5fa8f99ce447b213e9e3b49f24c.tar.gz linux-aea7427f70cce5fa8f99ce447b213e9e3b49f24c.tar.bz2 linux-aea7427f70cce5fa8f99ce447b213e9e3b49f24c.zip | |
ipv6: Remove options header when setsockopt's optlen is 0
Remove the sticky Hop-by-Hop options header by calling setsockopt()
for IPV6_HOPOPTS with a zero option length, per RFC3542.
Routing header and Destination options header does the same as
Hop-by-Hop options header.
Signed-off-by: Shan Wei <shanwei@cn.fujitsu.com>
Acked-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv6/ipv6_sockglue.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index c042ce19bd14..86e28a75267f 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -345,18 +345,21 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, case IPV6_DSTOPTS: { struct ipv6_txoptions *opt; + + /* remove any sticky options header with a zero option + * length, per RFC3542. + */ if (optlen == 0) optval = NULL; + else if (optlen < sizeof(struct ipv6_opt_hdr) || + optlen & 0x7 || optlen > 8 * 255) + goto e_inval; /* hop-by-hop / destination options are privileged option */ retv = -EPERM; if (optname != IPV6_RTHDR && !capable(CAP_NET_RAW)) break; - if (optlen < sizeof(struct ipv6_opt_hdr) || - optlen & 0x7 || optlen > 8 * 255) - goto e_inval; - opt = ipv6_renew_options(sk, np->opt, optname, (struct ipv6_opt_hdr __user *)optval, optlen); |