diff options
author | Florian Westphal <fw@strlen.de> | 2016-03-02 13:56:43 +0100 |
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committer | Florian Westphal <fw@strlen.de> | 2016-03-02 13:56:43 +0100 |
commit | 45e5e4e92a2c882b22e95a807026611612d57729 (patch) | |
tree | 7033161bdc8b1ccb910d830fc58af0b257604b28 /include/exthdr.h | |
parent | 3bfe9a0323df8e23fa5150b88282cc7b4a6379f0 (diff) |
netlink_delinearize: handle extension header templates with odd sizes
This enables nft to display
frag frag-off 33
... by considering a mask during binop postprocess in case
the initial template lookup done when the exthdr expression was
created did not yield a match.
In the above example, kernel netlink data specifies 16bits,
but the frag field is only 13bits wide.
We use the implicit binop mask to re-do the template lookup with
corrected offset and size information.
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'include/exthdr.h')
-rw-r--r-- | include/exthdr.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/exthdr.h b/include/exthdr.h index 87c42857..d17841bc 100644 --- a/include/exthdr.h +++ b/include/exthdr.h @@ -23,6 +23,8 @@ extern struct expr *exthdr_expr_alloc(const struct location *loc, extern void exthdr_init_raw(struct expr *expr, uint8_t type, unsigned int offset, unsigned int len); +extern bool exthdr_find_template(struct expr *expr, const struct expr *mask, + unsigned int *shift); enum hbh_hdr_fields { HBHHDR_INVALID, |