cregit-Linux how code gets into the kernel

Release 4.11 net/netfilter/nf_conntrack_snmp.c

Directory: net/netfilter
/*
 *      SNMP service broadcast connection tracking helper
 *
 *      (c) 2011 Jiri Olsa <jolsa@redhat.com>
 *
 *      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.
 */
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/in.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <linux/netfilter/nf_conntrack_snmp.h>


#define SNMP_PORT	161

MODULE_AUTHOR("Jiri Olsa <jolsa@redhat.com>");
MODULE_DESCRIPTION("SNMP service broadcast connection tracking helper");
MODULE_LICENSE("GPL");
MODULE_ALIAS_NFCT_HELPER("snmp");


static unsigned int timeout __read_mostly = 30;
module_param(timeout, uint, S_IRUSR);
MODULE_PARM_DESC(timeout, "timeout for master connection/replies in seconds");


int (*nf_nat_snmp_hook)(struct sk_buff *skb,
			unsigned int protoff,
			struct nf_conn *ct,
			enum ip_conntrack_info ctinfo);

EXPORT_SYMBOL_GPL(nf_nat_snmp_hook);


static int snmp_conntrack_help(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo) { typeof(nf_nat_snmp_hook) nf_nat_snmp; nf_conntrack_broadcast_help(skb, protoff, ct, ctinfo, timeout); nf_nat_snmp = rcu_dereference(nf_nat_snmp_hook); if (nf_nat_snmp && ct->status & IPS_NAT_MASK) return nf_nat_snmp(skb, protoff, ct, ctinfo); return NF_ACCEPT; }

Contributors

PersonTokensPropCommitsCommitProp
Jiri Olsa75100.00%1100.00%
Total75100.00%1100.00%

static struct nf_conntrack_expect_policy exp_policy = { .max_expected = 1, }; static struct nf_conntrack_helper helper __read_mostly = { .name = "snmp", .tuple.src.l3num = NFPROTO_IPV4, .tuple.src.u.udp.port = cpu_to_be16(SNMP_PORT), .tuple.dst.protonum = IPPROTO_UDP, .me = THIS_MODULE, .help = snmp_conntrack_help, .expect_policy = &exp_policy, };
static int __init nf_conntrack_snmp_init(void) { exp_policy.timeout = timeout; return nf_conntrack_helper_register(&helper); }

Contributors

PersonTokensPropCommitsCommitProp
Jiri Olsa22100.00%1100.00%
Total22100.00%1100.00%


static void __exit nf_conntrack_snmp_fini(void) { nf_conntrack_helper_unregister(&helper); }

Contributors

PersonTokensPropCommitsCommitProp
Jiri Olsa15100.00%1100.00%
Total15100.00%1100.00%

module_init(nf_conntrack_snmp_init); module_exit(nf_conntrack_snmp_fini);

Overall Contributors

PersonTokensPropCommitsCommitProp
Jiri Olsa29799.00%150.00%
Stephen Hemminger31.00%150.00%
Total300100.00%2100.00%
Directory: net/netfilter
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
Created with cregit.