diff options
| author |   Björn Töpel <bjorn.topel@intel.com> | 2019-08-15 11:30:14 +0200 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2019-08-17 23:24:45 +0200 |
| commit | 36cc34358caf631115e1566485fffed3cf4196b5 (patch) | |
| tree | d620399395987e1a16c5972eb97c8b2fd7725623 /kernel/bpf/xskmap.c | |
| parent | xsk: remove AF_XDP socket from map when the socket is released (diff) | |
| download | linux-dev-36cc34358caf631115e1566485fffed3cf4196b5.tar.xz linux-dev-36cc34358caf631115e1566485fffed3cf4196b5.zip | |
xsk: support BPF_EXIST and BPF_NOEXIST flags in XSKMAP
The XSKMAP did not honor the BPF_EXIST/BPF_NOEXIST flags when updating
an entry. This patch addresses that.
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to '')
| -rw-r--r-- | kernel/bpf/xskmap.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/kernel/bpf/xskmap.c b/kernel/bpf/xskmap.c index 16031d489173..4cc28e226398 100644 --- a/kernel/bpf/xskmap.c +++ b/kernel/bpf/xskmap.c @@ -226,8 +226,6 @@ static int xsk_map_update_elem(struct bpf_map *map, void *key, void *value, return -EINVAL; if (unlikely(i >= m->map.max_entries)) return -E2BIG; - if (unlikely(map_flags == BPF_NOEXIST)) - return -EEXIST; sock = sockfd_lookup(fd, &err); if (!sock) @@ -257,6 +255,12 @@ static int xsk_map_update_elem(struct bpf_map *map, void *key, void *value, if (old_xs == xs) { err = 0; goto out; + } else if (old_xs && map_flags == BPF_NOEXIST) { + err = -EEXIST; + goto out; + } else if (!old_xs && map_flags == BPF_EXIST) { + err = -ENOENT; + goto out; } xsk_map_sock_add(xs, node); WRITE_ONCE(*map_entry, xs); |