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Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 3029 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
75 lines
1.8 KiB
C
75 lines
1.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* broadcast connection tracking helper
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*
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* (c) 2005 Patrick McHardy <kaber@trash.net>
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*/
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#include <linux/module.h>
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#include <linux/ip.h>
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#include <net/route.h>
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#include <linux/inetdevice.h>
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#include <linux/skbuff.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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int nf_conntrack_broadcast_help(struct sk_buff *skb,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo,
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unsigned int timeout)
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{
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struct nf_conntrack_expect *exp;
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struct iphdr *iph = ip_hdr(skb);
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struct rtable *rt = skb_rtable(skb);
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struct in_device *in_dev;
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struct nf_conn_help *help = nfct_help(ct);
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__be32 mask = 0;
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/* we're only interested in locally generated packets */
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if (skb->sk == NULL || !net_eq(nf_ct_net(ct), sock_net(skb->sk)))
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goto out;
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if (rt == NULL || !(rt->rt_flags & RTCF_BROADCAST))
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goto out;
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if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL)
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goto out;
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in_dev = __in_dev_get_rcu(rt->dst.dev);
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if (in_dev != NULL) {
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for_primary_ifa(in_dev) {
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if (ifa->ifa_broadcast == iph->daddr) {
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mask = ifa->ifa_mask;
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break;
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}
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} endfor_ifa(in_dev);
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}
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if (mask == 0)
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goto out;
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exp = nf_ct_expect_alloc(ct);
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if (exp == NULL)
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goto out;
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exp->tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
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exp->tuple.src.u.udp.port = help->helper->tuple.src.u.udp.port;
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exp->mask.src.u3.ip = mask;
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exp->mask.src.u.udp.port = htons(0xFFFF);
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exp->expectfn = NULL;
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exp->flags = NF_CT_EXPECT_PERMANENT;
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exp->class = NF_CT_EXPECT_CLASS_DEFAULT;
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exp->helper = NULL;
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nf_ct_expect_related(exp);
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nf_ct_expect_put(exp);
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nf_ct_refresh(ct, skb, timeout * HZ);
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out:
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return NF_ACCEPT;
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}
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EXPORT_SYMBOL_GPL(nf_conntrack_broadcast_help);
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MODULE_LICENSE("GPL");
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