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flow_dissector: Support IPv6 fragment header 

Parse NEXTHDR_FRAGMENT. When seen account for it in the fragment bits of
key_control. Also, check if first fragment should be parsed.

Signed-off-by: Tom Herbert <tom@herbertland.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Tom Herbert 2015-09-01 09:24:29 -07:00 committed by David S. Miller
parent 807e165dc4
commit b840f28b90
1 changed files with 25 additions and 0 deletions
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25
net/core/flow_dissector.c
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@ -409,6 +409,31 @@ ip_proto_again:
goto ip_proto_again;
}
case NEXTHDR_FRAGMENT: {
struct frag_hdr _fh, *fh;
if (proto != htons(ETH_P_IPV6))
break;
fh = __skb_header_pointer(skb, nhoff, sizeof(_fh),
data, hlen, &_fh);
if (!fh)
goto out_bad;
key_control->is_fragment = 1;
nhoff += sizeof(_fh);
if (!(fh->frag_off & htons(IP6_OFFSET))) {
key_control->first_frag = 1;
if (flags & FLOW_DISSECTOR_F_PARSE_1ST_FRAG) {
ip_proto = fh->nexthdr;
goto ip_proto_again;
}
}
goto out_good;
}
case IPPROTO_IPIP:
proto = htons(ETH_P_IP);
goto ip;