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Subject[PATCH bpf v2] bpf, lpm: fix lookup bug in map_delete_elem
Date
From: Alban Crequy <alban@kinvolk.io>

trie_delete_elem() was deleting an entry even though it was not matching
if the prefixlen was correct. This patch adds a check on matchlen.

Reproducer:

$ sudo bpftool map create /sys/fs/bpf/mylpm type lpm_trie key 8 value 1 entries 128 name mylpm flags 1
$ sudo bpftool map update pinned /sys/fs/bpf/mylpm key hex 10 00 00 00 aa bb cc dd value hex 01
$ sudo bpftool map dump pinned /sys/fs/bpf/mylpm
key: 10 00 00 00 aa bb cc dd value: 01
Found 1 element
$ sudo bpftool map delete pinned /sys/fs/bpf/mylpm key hex 10 00 00 00 ff ff ff ff
$ echo $?
0
$ sudo bpftool map dump pinned /sys/fs/bpf/mylpm
Found 0 elements

A similar reproducer is added in the selftests.

Without the patch:

$ sudo ./tools/testing/selftests/bpf/test_lpm_map
test_lpm_map: test_lpm_map.c:485: test_lpm_delete: Assertion `bpf_map_delete_elem(map_fd, key) == -1 && errno == ENOENT' failed.
Aborted

With the patch: test_lpm_map runs without errors.

Fixes: e454cf595853 ("bpf: Implement map_delete_elem for BPF_MAP_TYPE_LPM_TRIE")
Cc: Craig Gallek <kraig@google.com>
Signed-off-by: Alban Crequy <alban@kinvolk.io>

---

Changes v1 to v2:
- add selftest (review from Martin)
- update commitmsg tags (review from Martin)
- rebase on "bpf" tree and test again (review from Martin)
---
kernel/bpf/lpm_trie.c | 1 +
tools/testing/selftests/bpf/test_lpm_map.c | 10 ++++++++++
2 files changed, 11 insertions(+)

diff --git a/kernel/bpf/lpm_trie.c b/kernel/bpf/lpm_trie.c
index abf1002080df..93a5cbbde421 100644
--- a/kernel/bpf/lpm_trie.c
+++ b/kernel/bpf/lpm_trie.c
@@ -471,6 +471,7 @@ static int trie_delete_elem(struct bpf_map *map, void *_key)
}

if (!node || node->prefixlen != key->prefixlen ||
+ node->prefixlen != matchlen ||
(node->flags & LPM_TREE_NODE_FLAG_IM)) {
ret = -ENOENT;
goto out;
diff --git a/tools/testing/selftests/bpf/test_lpm_map.c b/tools/testing/selftests/bpf/test_lpm_map.c
index 147e34cfceb7..02d7c871862a 100644
--- a/tools/testing/selftests/bpf/test_lpm_map.c
+++ b/tools/testing/selftests/bpf/test_lpm_map.c
@@ -474,6 +474,16 @@ static void test_lpm_delete(void)
assert(bpf_map_lookup_elem(map_fd, key, &value) == -1 &&
errno == ENOENT);

+ key->prefixlen = 30; // unused prefix so far
+ inet_pton(AF_INET, "192.255.0.0", key->data);
+ assert(bpf_map_delete_elem(map_fd, key) == -1 &&
+ errno == ENOENT);
+
+ key->prefixlen = 16; // same prefix as the root node
+ inet_pton(AF_INET, "192.255.0.0", key->data);
+ assert(bpf_map_delete_elem(map_fd, key) == -1 &&
+ errno == ENOENT);
+
/* assert initial lookup */
key->prefixlen = 32;
inet_pton(AF_INET, "192.168.0.1", key->data);
--
2.20.1
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