net/ipv4: Ensure that location of timestamp option is stored

[ Upstream commit 4660c7f498c07c43173142ea95145e9dac5a6d14 ]

This is needed in order to detect if the timestamp option appears
more than once in a packet, to remove the option if the packet is
fragmented, etc. My previous change neglected to store the option
location when the router addresses were prespecified and Pointer >
Length. But now the option location is also stored when Flag is an
unrecognized value, to ensure these option handling behaviors are
still performed.

Signed-off-by: David Ward <david.ward@ll.mit.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/ipv4/ip_options.c b/net/ipv4/ip_options.c
index 42dd1a9..40eb4fc 100644 (file)
--- a/net/ipv4/ip_options.c
+++ b/net/ipv4/ip_options.c
@@ -358,7 +358,6 @@ int ip_options_compile(struct net *net,
                                }
                                switch (optptr[3]&0xF) {
                                      case IPOPT_TS_TSONLY:
-                                       opt->ts = optptr - iph;
                                        if (skb)
                                                timeptr = &optptr[optptr[2]-1];
                                        opt->ts_needtime = 1;
@@ -369,7 +368,6 @@ int ip_options_compile(struct net *net,
                                                pp_ptr = optptr + 2;
                                                goto error;
                                        }
-                                       opt->ts = optptr - iph;
                                        if (rt)  {
                                                memcpy(&optptr[optptr[2]-1], &rt->rt_spec_dst, 4);
                                                timeptr = &optptr[optptr[2]+3];
@@ -383,7 +381,6 @@ int ip_options_compile(struct net *net,
                                                pp_ptr = optptr + 2;
                                                goto error;
                                        }
-                                       opt->ts = optptr - iph;
                                        {
                                                __be32 addr;
                                                memcpy(&addr, &optptr[optptr[2]-1], 4);
@@ -416,12 +413,12 @@ int ip_options_compile(struct net *net,
                                        pp_ptr = optptr + 3;
                                        goto error;
                                }
-                               opt->ts = optptr - iph;
                                if (skb) {
                                        optptr[3] = (optptr[3]&0xF)|((overflow+1)<<4);
                                        opt->is_changed = 1;
                                }
                        }
+                       opt->ts = optptr - iph;
                        break;
                      case IPOPT_RA:
                        if (optlen < 4) {