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netfilter: nf_osf: add nf_osf_find()

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This new function returns the OS genre as a string. Plan is to use to
from the new nft_osf extension.

Note that this doesn't yet support ttl options, but it could be easily
extended to do so.

Tested-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Pablo Neira Ayuso 2018-07-13 14:54:45 +02:00
parent 222440b4e8
commit 51c23b47e6
2 changed files with 39 additions and 0 deletions
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9
include/linux/netfilter/nf_osf.h
View file

@ -1,3 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _NFOSF_H
#define _NFOSF_H
#include <uapi/linux/netfilter/nf_osf.h>
/* Initial window size option state machine: multiple of mss, mtu or
@ -31,3 +35,8 @@ bool nf_osf_match(const struct sk_buff *skb, u_int8_t family,
int hooknum, struct net_device *in, struct net_device *out,
const struct nf_osf_info *info, struct net *net,
const struct list_head *nf_osf_fingers);
const char *nf_osf_find(const struct sk_buff *skb,
const struct list_head *nf_osf_fingers);
#endif /* _NFOSF_H */