xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

bpf: add End.DT6 action to bpf_lwt_seg6_action helper

Browse Source 
The seg6local LWT provides the End.DT6 action, which allows to
decapsulate an outer IPv6 header containing a Segment Routing Header
(SRH), full specification is available here:

https://tools.ietf.org/html/draft-filsfils-spring-srv6-network-programming-05

This patch adds this action now to the seg6local BPF
interface. Since it is not mandatory that the inner IPv6 header also
contains a SRH, seg6_bpf_srh_state has been extended with a pointer to
a possible SRH of the outermost IPv6 header. This helps assessing if the
validation must be triggered or not, and avoids some calls to
ipv6_find_hdr.

v3: s/1/true, s/0/false for boolean values
v2: - changed true/false -> 1/0
    - preempt_enable no longer called in first conditional block

Signed-off-by: Mathieu Xhonneux <m.xhonneux@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Mathieu Xhonneux
2018-07-26 02:10:40 +00:00
committed by Daniel Borkmann
parent 1ce6a9fc15
commit 486cdf2158
3 changed files with 94 additions and 48 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/seg6_local.h
View File

@@ -21,10 +21,12 @@
extern int seg6_lookup_nexthop(struct sk_buff *skb, struct in6_addr *nhaddr,
u32 tbl_id);
extern bool seg6_bpf_has_valid_srh(struct sk_buff *skb);
struct seg6_bpf_srh_state {
bool valid;
struct ipv6_sr_hdr *srh;
u16 hdrlen;
bool valid;
};
DECLARE_PER_CPU(struct seg6_bpf_srh_state, seg6_bpf_srh_states);