diff options
| author | Willem de Bruijn <willemb@google.com> | 2017-01-08 01:06:38 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-01-09 04:58:52 +0300 |
| commit | bc31c905e946b5c55df5d2938335e78ffb3157ca (patch) | |
| tree | 2a40cf0584931cbc96185814f8d922fd4f363f00 /include/linux/skbuff.h | |
| parent | 8dc07fdbf2054f157e8333f940a1ad728916c786 (diff) | |
| download | linux-bc31c905e946b5c55df5d2938335e78ffb3157ca.tar.xz | |
net-tc: convert tc_from to tc_from_ingress and tc_redirected
The tc_from field fulfills two roles. It encodes whether a packet was
redirected by an act_mirred device and, if so, whether act_mirred was
called on ingress or egress. Split it into separate fields.
The information is needed by the special IFB loop, where packets are
taken out of the normal path by act_mirred, forwarded to IFB, then
reinjected at their original location (ingress or egress) by IFB.
The IFB device cannot use skb->tc_at_ingress, because that may have
been overwritten as the packet travels from act_mirred to ifb_xmit,
when it passes through tc_classify on the IFB egress path. Cache this
value in skb->tc_from_ingress.
That field is valid only if a packet arriving at ifb_xmit came from
act_mirred. Other packets can be crafted to reach ifb_xmit. These
must be dropped. Set tc_redirected on redirection and drop all packets
that do not have this bit set.
Both fields are set only on cloned skbs in tc actions, so original
packet sources do not have to clear the bit when reusing packets
(notably, pktgen and octeon).
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/skbuff.h')
| -rw-r--r-- | include/linux/skbuff.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index fab3f87e9bd1..3149a88de548 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -591,6 +591,8 @@ static inline bool skb_mstamp_after(const struct skb_mstamp *t1, * @ipvs_property: skbuff is owned by ipvs * @tc_skip_classify: do not classify packet. set by IFB device * @tc_at_ingress: used within tc_classify to distinguish in/egress + * @tc_redirected: packet was redirected by a tc action + * @tc_from_ingress: if tc_redirected, tc_at_ingress at time of redirect * @peeked: this packet has been seen already, so stats have been * done for it, don't do them again * @nf_trace: netfilter packet trace flag @@ -753,7 +755,8 @@ struct sk_buff { #ifdef CONFIG_NET_CLS_ACT __u8 tc_skip_classify:1; __u8 tc_at_ingress:1; - __u8 tc_from:2; + __u8 tc_redirected:1; + __u8 tc_from_ingress:1; #endif #ifdef CONFIG_NET_SCHED |