openkylin
/
platform_kernel-5.15
mirror of https://gitee.com/openkylin/platform_kernel-5.15.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

samples, bpf: Add an explict comment to handle nested vlan tagging. 

A codeblock for handling nested vlan trips newbies into thinking it as
duplicate code. Explicitly add a comment to clarify.

Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20210809070046.32142-1-falakreyaz@gmail.com
This commit is contained in:
Muhammad Falak R Wani 2021-08-09 12:30:46 +05:30 committed by Daniel Borkmann
parent 6aab1c81b9
commit d692a637b4
2 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
samples/bpf/xdp1_kern.c
View File

@ -57,6 +57,7 @@ int xdp_prog1(struct xdp_md *ctx)
h_proto = eth->h_proto; h_proto = eth->h_proto;
/* Handle VLAN tagged packet */
if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) { if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
struct vlan_hdr *vhdr; struct vlan_hdr *vhdr;
@ -66,6 +67,7 @@ int xdp_prog1(struct xdp_md *ctx)
return rc; return rc;
h_proto = vhdr->h_vlan_encapsulated_proto; h_proto = vhdr->h_vlan_encapsulated_proto;
} }
/* Handle double VLAN tagged packet */
if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) { if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
struct vlan_hdr *vhdr; struct vlan_hdr *vhdr;

2
samples/bpf/xdp2_kern.c
View File

@ -73,6 +73,7 @@ int xdp_prog1(struct xdp_md *ctx)
h_proto = eth->h_proto; h_proto = eth->h_proto;
/* Handle VLAN tagged packet */
if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) { if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
struct vlan_hdr *vhdr; struct vlan_hdr *vhdr;
@ -82,6 +83,7 @@ int xdp_prog1(struct xdp_md *ctx)
return rc; return rc;
h_proto = vhdr->h_vlan_encapsulated_proto; h_proto = vhdr->h_vlan_encapsulated_proto;
} }
/* Handle double VLAN tagged packet */
if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) { if (h_proto == htons(ETH_P_8021Q) || h_proto == htons(ETH_P_8021AD)) {
struct vlan_hdr *vhdr; struct vlan_hdr *vhdr;