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IPv4 and IPv6 packets may arrive with lower-layer padding that is not included in the L3 length. For example, a short IPv4 packet may have up to 6 bytes of padding following the IP payload when received on an Ethernet device with a minimum packet length of 64 bytes. Higher-layer processing functions in netfilter (e.g. nf_ip_checksum(), and help() in nf_conntrack_ftp) assume skb->len reflects the length of the L3 header and payload, rather than referring back to ip_hdr->tot_len or ipv6_hdr->payload_len, and get confused by lower-layer padding. In the normal IPv4 receive path, ip_rcv() trims the packet to ip_hdr->tot_len before invoking netfilter hooks. In the IPv6 receive path, ip6_rcv() does the same using ipv6_hdr->payload_len. Similarly in the br_netfilter receive path, br_validate_ipv4() and br_validate_ipv6() trim the packet to the L3 length before invoking netfilter hooks. Currently in the OVS conntrack receive path, ovs_ct_execute() pulls the skb to the L3 header but does not trim it to the L3 length before calling nf_conntrack_in(NF_INET_PRE_ROUTING). When nf_conntrack_proto_tcp encounters a packet with lower-layer padding, nf_ip_checksum() fails causing a "nf_ct_tcp: bad TCP checksum" log message. While extra zero bytes don't affect the checksum, the length in the IP pseudoheader does. That length is based on skb->len, and without trimming, it doesn't match the length the sender used when computing the checksum. In ovs_ct_execute(), trim the skb to the L3 length before higher-layer processing. Signed-off-by: Ed Swierk <eswierk@skyportsystems.com> Acked-by: Pravin B Shelar <pshelar@ovn.org> Signed-off-by: David S. Miller <davem@davemloft.net> |
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| .. | ||
| actions.c | ||
| conntrack.c | ||
| conntrack.h | ||
| datapath.c | ||
| datapath.h | ||
| dp_notify.c | ||
| flow_netlink.c | ||
| flow_netlink.h | ||
| flow_table.c | ||
| flow_table.h | ||
| flow.c | ||
| flow.h | ||
| Kconfig | ||
| Makefile | ||
| meter.c | ||
| meter.h | ||
| vport-geneve.c | ||
| vport-gre.c | ||
| vport-internal_dev.c | ||
| vport-internal_dev.h | ||
| vport-netdev.c | ||
| vport-netdev.h | ||
| vport-vxlan.c | ||
| vport.c | ||
| vport.h | ||