diff options
| author |   Alexei Starovoitov <ast@kernel.org> | 2019-03-21 18:59:11 -0700 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2019-03-21 18:59:12 -0700 |
| commit | 2569473816a9ade34c2ba051118337b2d69007df (patch) | |
| tree | 7121a9eaa84868932fd2b124ac432e4424d17eeb /include/linux | |
| parent | selftests/bpf: Add arm target register definitions (diff) | |
| parent | selftests/bpf: add tests for bpf_tcp_check_syncookie and bpf_skc_lookup_tcp (diff) | |
Merge branch 'bpf_tcp_check_syncookie'
Lorenz Bauer says:
====================
This series adds the necessary helpers to determine wheter a given
(encapsulated) TCP packet belongs to a connection known to the network stack.
* bpf_skc_lookup_tcp gives access to request and timewait sockets
* bpf_tcp_check_syncookie identifies the final 3WHS ACK when syncookies
are enabled
The goal is to be able to implement load-balancing approaches like
glb-director [1] or Beamer [2] in pure eBPF. Specifically, we'd like to replace
the functionality of the glb-redirect kernel module [3] by an XDP program or
tc classifier.
Changes in v3:
* Fix missing check for ip4->ihl
* Only cast to unsigned long in BPF_CALLs
Changes in v2:
* Rename bpf_sk_check_syncookie to bpf_tcp_check_syncookie.
* Add bpf_skc_lookup_tcp. Without it bpf_tcp_check_syncookie doesn't make sense.
* Check tcp_synq_no_recent_overflow() in bpf_tcp_check_syncookie.
* Check th->syn in bpf_tcp_check_syncookie.
* Require CONFIG_IPV6 to be a built in.
1: https://github.com/github/glb-director
2: https://www.usenix.org/conference/nsdi18/presentation/olteanu
3: https://github.com/github/glb-director/tree/master/src/glb-redirect
====================
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/bpf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/bpf.h b/include/linux/bpf.h index f02367faa58d..f62897198844 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -205,6 +205,7 @@ enum bpf_return_type { RET_PTR_TO_MAP_VALUE_OR_NULL, /* returns a pointer to map elem value or NULL */ RET_PTR_TO_SOCKET_OR_NULL, /* returns a pointer to a socket or NULL */ RET_PTR_TO_TCP_SOCK_OR_NULL, /* returns a pointer to a tcp_sock or NULL */ + RET_PTR_TO_SOCK_COMMON_OR_NULL, /* returns a pointer to a sock_common or NULL */ }; /* eBPF function prototype used by verifier to allow BPF_CALLs from eBPF programs |