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Release 4.8 net/netfilter/nf_conntrack_broadcast.c

Directory: net/netfilter
 *      broadcast connection tracking helper
 *      (c) 2005 Patrick McHardy <>
 *      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/module.h>
#include <linux/ip.h>
#include <net/route.h>
#include <linux/inetdevice.h>
#include <linux/skbuff.h>

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

int nf_conntrack_broadcast_help(struct sk_buff *skb, unsigned int protoff, struct nf_conn *ct, enum ip_conntrack_info ctinfo, unsigned int timeout) { struct nf_conntrack_expect *exp; struct iphdr *iph = ip_hdr(skb); struct rtable *rt = skb_rtable(skb); struct in_device *in_dev; struct nf_conn_help *help = nfct_help(ct); __be32 mask = 0; /* we're only interested in locally generated packets */ if (skb->sk == NULL) goto out; if (rt == NULL || !(rt->rt_flags & RTCF_BROADCAST)) goto out; if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) goto out; rcu_read_lock(); in_dev = __in_dev_get_rcu(rt->; if (in_dev != NULL) { for_primary_ifa(in_dev) { if (ifa->ifa_broadcast == iph->daddr) { mask = ifa->ifa_mask; break; } } endfor_ifa(in_dev); } rcu_read_unlock(); if (mask == 0) goto out; exp = nf_ct_expect_alloc(ct); if (exp == NULL) goto out; exp->tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple; exp->tuple.src.u.udp.port = help->helper->tuple.src.u.udp.port; exp->mask.src.u3.ip = mask; exp->mask.src.u.udp.port = htons(0xFFFF); exp->expectfn = NULL; exp->flags = NF_CT_EXPECT_PERMANENT; exp->class = NF_CT_EXPECT_CLASS_DEFAULT; exp->helper = NULL; nf_ct_expect_related(exp); nf_ct_expect_put(exp); nf_ct_refresh(ct, skb, timeout * HZ); out: return NF_ACCEPT; }


jiri olsajiri olsa312100.00%1100.00%

EXPORT_SYMBOL_GPL(nf_conntrack_broadcast_help); MODULE_LICENSE("GPL");

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jiri olsajiri olsa347100.00%1100.00%
Directory: net/netfilter
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