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| author | Pablo Neira Ayuso <pablo@netfilter.org> | 2020-03-22 03:21:58 +0100 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2020-03-24 19:58:57 +0100 |
| commit | 8c2d45b2b65ca1f215244be1c600236e83f9815f (patch) | |
| tree | 9d1e3ba2f9f85469583c0af71dc528329a3425fe | |
| parent | 749f6f6843115b424680f1aada3c0dd613ad807c (diff) | |
| download | linux-8c2d45b2b65ca1f215244be1c600236e83f9815f.tar.bz2 | |
netfilter: nf_tables: Allow set back-ends to report partial overlaps on insertion
Currently, the -EEXIST return code of ->insert() callbacks is ambiguous: it
might indicate that a given element (including intervals) already exists as
such, or that the new element would clash with existing ones.
If identical elements already exist, the front-end is ignoring this without
returning error, in case NLM_F_EXCL is not set. However, if the new element
can't be inserted due an overlap, we should report this to the user.
To this purpose, allow set back-ends to return -ENOTEMPTY on collision with
existing elements, translate that to -EEXIST, and return that to userspace,
no matter if NLM_F_EXCL was set.
Reported-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| -rw-r--r-- | net/netfilter/nf_tables_api.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c index 38c680f28f15..d11f1a74d43c 100644 --- a/net/netfilter/nf_tables_api.c +++ b/net/netfilter/nf_tables_api.c @@ -5082,6 +5082,11 @@ static int nft_add_set_elem(struct nft_ctx *ctx, struct nft_set *set, err = -EBUSY; else if (!(nlmsg_flags & NLM_F_EXCL)) err = 0; + } else if (err == -ENOTEMPTY) { + /* ENOTEMPTY reports overlapping between this element + * and an existing one. + */ + err = -EEXIST; } goto err_element_clash; } |