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netfilter: nf_tables: Allow set back-ends to report partial overlaps on insertion

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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>
This commit is contained in:
Pablo Neira Ayuso 2020-03-22 03:21:58 +01:00
parent 749f6f6843
commit 8c2d45b2b6
1 changed files with 5 additions and 0 deletions
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5
net/netfilter/nf_tables_api.c
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@ -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;
}