diff options
author | Etan Kissling <etan_kissling@apple.com> | 2021-01-19 16:05:39 +0100 |
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committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2021-02-09 17:31:31 +0100 |
commit | 662c8f44d53492d2e0ebd430dadef12d580ec330 (patch) | |
tree | bcaf73295210ad7c10c5ab57962ea3d482316846 /src/extra | |
parent | 0fcf33229820f1c89ae75bc54cb41c2acdd5d067 (diff) |
src: add pkt_buff function for ICMP
Add support for processing ICMP packets using pkt_buff, similar to
existing library support for TCP and UDP.
Signed-off-by: Etan Kissling <etan_kissling@apple.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'src/extra')
-rw-r--r-- | src/extra/icmp.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/src/extra/icmp.c b/src/extra/icmp.c new file mode 100644 index 0000000..a97979b --- /dev/null +++ b/src/extra/icmp.c @@ -0,0 +1,48 @@ +/* + * (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This code has been sponsored by Vyatta Inc. <http://www.vyatta.com> + */ + +#include <stdio.h> +#define _GNU_SOURCE +#include <netinet/ip_icmp.h> + +#include <libnetfilter_queue/libnetfilter_queue_icmp.h> + +#include "internal.h" + +/** + * \defgroup icmp ICMP helper functions + * @{ + */ + +/** + * nfq_icmp_get_hdr - get the ICMP header. + * \param pktb: pointer to user-space network packet buffer + * \returns validated pointer to the ICMP header or NULL if the ICMP header was + * not set or if a minimal length check fails. + * \note You have to call nfq_ip_set_transport_header() or + * nfq_ip6_set_transport_header() first to set the ICMP header. + */ +EXPORT_SYMBOL +struct icmphdr *nfq_icmp_get_hdr(struct pkt_buff *pktb) +{ + if (pktb->transport_header == NULL) + return NULL; + + /* No room for the ICMP header. */ + if (pktb_tail(pktb) - pktb->transport_header < sizeof(struct icmphdr)) + return NULL; + + return (struct icmphdr *)pktb->transport_header; +} + +/** + * @} + */ |