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| author | Björn Töpel <bjorn.topel@intel.com> | 2018-05-02 14:01:28 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2018-05-04 01:55:24 +0300 |
| commit | fbfc504a24f53f7ebe128ab55cb5dba634f4ece8 (patch) | |
| tree | d88b2d04cf60d5b77a5d794a3e0b006738c47e77 /kernel/bpf/verifier.c | |
| parent | c497176cb2e478f0a5713b0e05f242276e3194b5 (diff) | |
| download | linux-fbfc504a24f53f7ebe128ab55cb5dba634f4ece8.tar.xz | |
bpf: introduce new bpf AF_XDP map type BPF_MAP_TYPE_XSKMAP
The xskmap is yet another BPF map, very much inspired by
dev/cpu/sockmap, and is a holder of AF_XDP sockets. A user application
adds AF_XDP sockets into the map, and by using the bpf_redirect_map
helper, an XDP program can redirect XDP frames to an AF_XDP socket.
Note that a socket that is bound to certain ifindex/queue index will
*only* accept XDP frames from that netdev/queue index. If an XDP
program tries to redirect from a netdev/queue index other than what
the socket is bound to, the frame will not be received on the socket.
A socket can reside in multiple maps.
v3: Fixed race and simplified code.
v2: Removed one indirection in map lookup.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'kernel/bpf/verifier.c')
| -rw-r--r-- | kernel/bpf/verifier.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 712d8655e916..0d91f18b2eb5 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -2070,8 +2070,11 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env, if (func_id != BPF_FUNC_redirect_map) goto error; break; - /* Restrict bpf side of cpumap, open when use-cases appear */ + /* Restrict bpf side of cpumap and xskmap, open when use-cases + * appear. + */ case BPF_MAP_TYPE_CPUMAP: + case BPF_MAP_TYPE_XSKMAP: if (func_id != BPF_FUNC_redirect_map) goto error; break; @@ -2118,7 +2121,8 @@ static int check_map_func_compatibility(struct bpf_verifier_env *env, break; case BPF_FUNC_redirect_map: if (map->map_type != BPF_MAP_TYPE_DEVMAP && - map->map_type != BPF_MAP_TYPE_CPUMAP) + map->map_type != BPF_MAP_TYPE_CPUMAP && + map->map_type != BPF_MAP_TYPE_XSKMAP) goto error; break; case BPF_FUNC_sk_redirect_map: |