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| author | Daniel Borkmann | 2018-05-28 17:43:17 +0200 |
|---|---|---|
| committer | Daniel Borkmann | 2018-05-28 17:43:32 +0200 |
| commit | f198222f056745b2622c89190a13c5a485011014 (patch) | |
| tree | bbd9942a50c573ec135a3d31326b519a722c79f0 /tools/include/uapi/linux/bpf.h | |
| parent | selftests/bpf: missing headers test_lwt_seg6local (diff) | |
| parent | selftests/bpf: Selftest for sys_sendmsg hooks (diff) | |
| download | kernel-qcow2-linux-f198222f056745b2622c89190a13c5a485011014.tar.gz kernel-qcow2-linux-f198222f056745b2622c89190a13c5a485011014.tar.xz kernel-qcow2-linux-f198222f056745b2622c89190a13c5a485011014.zip | |
Merge branch 'bpf-sendmsg-hook'
Andrey Ignatov says:
====================
v3 -> v4:
* handle static key correctly for CONFIG_CGROUP_BPF=n.
v2 -> v3:
* place BPF logic under static key in udp_sendmsg, udpv6_sendmsg;
* rebase.
v1 -> v2:
* return ENOTSUPP if bpf_prog rewrote IPv6-only with IPv4-mapped IPv6;
* add test for IPv4-mapped IPv6 use-case;
* fix build for CONFIG_CGROUP_BPF=n;
* rebase.
This path set adds BPF hooks for sys_sendmsg similar to existing hooks for
sys_bind and sys_connect.
Hooks allow to override source IP (including the case when it's set via
cmsg(3)) and destination IP:port for unconnected UDP (slow path). TCP and
connected UDP (fast path) are not affected. This makes UDP support
complete: connected UDP is handled by sys_connect hooks, unconnected by
sys_sendmsg ones.
Similar to sys_connect hooks, sys_sendmsg ones can be used to make system
calls such as sendmsg(2) and sendto(2) return EPERM.
Please see patch 0002 for more details.
====================
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'tools/include/uapi/linux/bpf.h')
| -rw-r--r-- | tools/include/uapi/linux/bpf.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 9b8c6e310e9a..cc68787f2d97 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -160,6 +160,8 @@ enum bpf_attach_type { BPF_CGROUP_INET6_CONNECT, BPF_CGROUP_INET4_POST_BIND, BPF_CGROUP_INET6_POST_BIND, + BPF_CGROUP_UDP4_SENDMSG, + BPF_CGROUP_UDP6_SENDMSG, __MAX_BPF_ATTACH_TYPE }; @@ -2363,6 +2365,12 @@ struct bpf_sock_addr { __u32 family; /* Allows 4-byte read, but no write */ __u32 type; /* Allows 4-byte read, but no write */ __u32 protocol; /* Allows 4-byte read, but no write */ + __u32 msg_src_ip4; /* Allows 1,2,4-byte read an 4-byte write. + * Stored in network byte order. + */ + __u32 msg_src_ip6[4]; /* Allows 1,2,4-byte read an 4-byte write. + * Stored in network byte order. + */ }; /* User bpf_sock_ops struct to access socket values and specify request ops |