diff options
| author | Jan Luebbe <jluebbe@debian.org> | 2011-03-24 07:44:22 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-03-27 23:35:02 -0700 |
| commit | 8628bd8af7c4c14f40f5183f80f5744c4e682439 (patch) | |
| tree | d931f03c6ef14ad8df7c6c697e56081f816c2af7 /net/ipv4/ip_options.c | |
| parent | dc760b375e50a47847d4942811bd9679beeb5535 (diff) | |
| download | linux-8628bd8af7c4c14f40f5183f80f5744c4e682439.tar.bz2 | |
ipv4: Fix IP timestamp option (IPOPT_TS_PRESPEC) handling in ip_options_echo()
The current handling of echoed IP timestamp options with prespecified
addresses is rather broken since the 2.2.x kernels. As far as i understand
it, it should behave like when originating packets.
Currently it will only timestamp the next free slot if:
- there is space for *two* timestamps
- some random data from the echoed packet taken as an IP is *not* a local IP
This first is caused by an off-by-one error. 'soffset' points to the next
free slot and so we only need to have 'soffset + 7 <= optlen'.
The second bug is using sptr as the start of the option, when it really is
set to 'skb_network_header(skb)'. I just use dptr instead which points to
the timestamp option.
Finally it would only timestamp for non-local IPs, which we shouldn't do.
So instead we exclude all unicast destinations, similar to what we do in
ip_options_compile().
Signed-off-by: Jan Luebbe <jluebbe@debian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_options.c')
| -rw-r--r-- | net/ipv4/ip_options.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c index 1906fa35860c..28a736f3442f 100644 --- a/net/ipv4/ip_options.c +++ b/net/ipv4/ip_options.c @@ -140,11 +140,11 @@ int ip_options_echo(struct ip_options * dopt, struct sk_buff * skb) } else { dopt->ts_needtime = 0; - if (soffset + 8 <= optlen) { + if (soffset + 7 <= optlen) { __be32 addr; - memcpy(&addr, sptr+soffset-1, 4); - if (inet_addr_type(dev_net(skb_dst(skb)->dev), addr) != RTN_LOCAL) { + memcpy(&addr, dptr+soffset-1, 4); + if (inet_addr_type(dev_net(skb_dst(skb)->dev), addr) != RTN_UNICAST) { dopt->ts_needtime = 1; soffset += 8; } |