From 36cc34358caf631115e1566485fffed3cf4196b5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= Date: Thu, 15 Aug 2019 11:30:14 +0200 Subject: [PATCH] xsk: support BPF_EXIST and BPF_NOEXIST flags in XSKMAP MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The XSKMAP did not honor the BPF_EXIST/BPF_NOEXIST flags when updating an entry. This patch addresses that. Signed-off-by: Björn Töpel Signed-off-by: Daniel Borkmann --- kernel/bpf/xskmap.c | 8 ++++++-- 1 file 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);