diff options
| author |   John Fastabend <john.fastabend@gmail.com> | 2017-07-17 09:29:18 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-07-17 09:48:06 -0700 |
| commit | 97f91a7cf04ff605845c20948b8a80e54cbd3376 (patch) | |
| tree | 0d5c2872667d06e7e2a7f83253505c5170a0258b /kernel | |
| parent | bpf: add devmap, a map for storing net device references (diff) | |
| download | linux-dev-97f91a7cf04ff605845c20948b8a80e54cbd3376.tar.xz linux-dev-97f91a7cf04ff605845c20948b8a80e54cbd3376.zip | |
bpf: add bpf_redirect_map helper routine
BPF programs can use the devmap with a bpf_redirect_map() helper
routine to forward packets to netdevice in map.
Signed-off-by: John Fastabend <john.fastabend@gmail.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/bpf/devmap.c | 12 | ||||
| -rw-r--r-- | kernel/bpf/verifier.c | 4 |
2 files changed, 16 insertions, 0 deletions
diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index 1a878356bd37..36dc13deb2e1 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -159,6 +159,18 @@ static int dev_map_get_next_key(struct bpf_map *map, void *key, void *next_key) return 0; } +struct net_device *__dev_map_lookup_elem(struct bpf_map *map, u32 key) +{ + struct bpf_dtab *dtab = container_of(map, struct bpf_dtab, map); + struct bpf_dtab_netdev *dev; + + if (key >= map->max_entries) + return NULL; + + dev = READ_ONCE(dtab->netdev_map[key]); + return dev ? dev->dev : NULL; +} + /* rcu_read_lock (from syscall and BPF contexts) ensures that if a delete and/or * update happens in parallel here a dev_put wont happen until after reading the * ifindex. diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c index 4016774d5cca..df05d65f0c87 100644 --- a/kernel/bpf/verifier.c +++ b/kernel/bpf/verifier.c @@ -1312,6 +1312,10 @@ static int check_map_func_compatibility(struct bpf_map *map, int func_id) if (map->map_type != BPF_MAP_TYPE_CGROUP_ARRAY) goto error; break; + case BPF_FUNC_redirect_map: + if (map->map_type != BPF_MAP_TYPE_DEVMAP) + goto error; + break; default: break; } |