path: root/net/ipv6/netfilter/ip6table_raw.c
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authorSubash Abhinov Kasiviswanathan <subashab@codeaurora.org>2018-01-12 17:36:27 -0700
committerPablo Neira Ayuso <pablo@netfilter.org>2018-01-16 01:52:06 +0100
commit83f1999caeb14e15df205e80d210699951733287 (patch)
tree77facde53b8e8a83903512c092765c8ddb16c191 /net/ipv6/netfilter/ip6table_raw.c
parentnetfilter: x_tables: don't return garbage pointer on modprobe failure (diff)
netfilter: ipv6: nf_defrag: Pass on packets to stack per RFC2460
ipv6_defrag pulls network headers before fragment header. In case of an error, the netfilter layer is currently dropping these packets. This results in failure of some IPv6 standards tests which passed on older kernels due to the netfilter framework using cloning. The test case run here is a check for ICMPv6 error message replies when some invalid IPv6 fragments are sent. This specific test case is listed in https://www.ipv6ready.org/docs/Core_Conformance_Latest.pdf in the Extension Header Processing Order section. A packet with unrecognized option Type 11 is sent and the test expects an ICMP error in line with RFC2460 section 4.2 - 11 - discard the packet and, only if the packet's Destination Address was not a multicast address, send an ICMP Parameter Problem, Code 2, message to the packet's Source Address, pointing to the unrecognized Option Type. Since netfilter layer now drops all invalid IPv6 frag packets, we no longer see the ICMP error message and fail the test case. To fix this, save the transport header. If defrag is unable to process the packet due to RFC2460, restore the transport header and allow packet to be processed by stack. There is no change for other packet processing paths. Tested by confirming that stack sends an ICMP error when it receives these packets. Also tested that fragmented ICMP pings succeed. v1->v2: Instead of cloning always, save the transport_header and restore it in case of this specific error. Update the title and commit message accordingly. Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'net/ipv6/netfilter/ip6table_raw.c')
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