diff options
| author | Christian Ehrig <cehrig@cloudflare.com> | 2023-04-07 15:38:54 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2023-04-13 01:40:39 +0200 |
| commit | c50e96099edb134bf107fafc02715fbc4aa2277f (patch) | |
| tree | 4c9aaa19e524055ea4c6e5b6ca6f11ca40fc4bd0 /include/net/fou.h | |
| parent | ipip,ip_tunnel,sit: Add FOU support for externally controlled ipip devices (diff) | |
| download | linux-c50e96099edb134bf107fafc02715fbc4aa2277f.tar.xz linux-c50e96099edb134bf107fafc02715fbc4aa2277f.zip | |
bpf,fou: Add bpf_skb_{set,get}_fou_encap kfuncs
Add two new kfuncs that allow a BPF tc-hook, installed on an ipip
device in collect-metadata mode, to control FOU encap parameters on a
per-packet level. The set of kfuncs is registered with the fou module.
The bpf_skb_set_fou_encap kfunc is supposed to be used in tandem and after
a successful call to the bpf_skb_set_tunnel_key bpf-helper. UDP source and
destination ports can be controlled by passing a struct bpf_fou_encap. A
source port of zero will auto-assign a source port. enum bpf_fou_encap_type
is used to specify if the egress path should FOU or GUE encap the packet.
On the ingress path bpf_skb_get_fou_encap can be used to read UDP source
and destination ports from the receiver's point of view and allows for
packet multiplexing across different destination ports within a single
BPF program and ipip device.
Signed-off-by: Christian Ehrig <cehrig@cloudflare.com>
Link: https://lore.kernel.org/r/e17c94a646b63e78ce0dbf3f04b2c33dc948a32d.1680874078.git.cehrig@cloudflare.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/net/fou.h')
| -rw-r--r-- | include/net/fou.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/net/fou.h b/include/net/fou.h index 80f56e275b08..824eb4b231fd 100644 --- a/include/net/fou.h +++ b/include/net/fou.h @@ -17,4 +17,6 @@ int __fou_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, int __gue_build_header(struct sk_buff *skb, struct ip_tunnel_encap *e, u8 *protocol, __be16 *sport, int type); +int register_fou_bpf(void); + #endif |