cregit-Linux how code gets into the kernel

Release 4.7 net/ipv6/netfilter/nf_dup_ipv6.c

/*
 * (C) 2007 by Sebastian Claßen <sebastian.classen@freenet.ag>
 * (C) 2007-2010 by Jan Engelhardt <jengelh@medozas.de>
 *
 * Extracted from xt_TEE.c
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 or later, as
 * published by the Free Software Foundation.
 */
#include <linux/module.h>
#include <linux/percpu.h>
#include <linux/skbuff.h>
#include <linux/netfilter.h>
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <net/netfilter/ipv6/nf_dup_ipv6.h>
#if IS_ENABLED(CONFIG_NF_CONNTRACK)
#include <net/netfilter/nf_conntrack.h>
#endif


static bool nf_dup_ipv6_route(struct net *net, struct sk_buff *skb, const struct in6_addr *gw, int oif) { const struct ipv6hdr *iph = ipv6_hdr(skb); struct dst_entry *dst; struct flowi6 fl6; memset(&fl6, 0, sizeof(fl6)); if (oif != -1) fl6.flowi6_oif = oif; fl6.daddr = *gw; fl6.flowlabel = (__force __be32)(((iph->flow_lbl[0] & 0xF) << 16) | (iph->flow_lbl[1] << 8) | iph->flow_lbl[2]); fl6.flowi6_flags = FLOWI_FLAG_KNOWN_NH; dst = ip6_route_output(net, NULL, &fl6); if (dst->error) { dst_release(dst); return false; } skb_dst_drop(skb); skb_dst_set(skb, dst); skb->dev = dst->dev; skb->protocol = htons(ETH_P_IPV6); return true; }

Contributors

PersonTokensPropCommitsCommitProp
pablo neira ayusopablo neira ayuso17694.12%250.00%
paolo abenipaolo abeni63.21%125.00%
eric w. biedermaneric w. biederman52.67%125.00%
Total187100.00%4100.00%


void nf_dup_ipv6(struct net *net, struct sk_buff *skb, unsigned int hooknum, const struct in6_addr *gw, int oif) { if (this_cpu_read(nf_skb_duplicated)) return; skb = pskb_copy(skb, GFP_ATOMIC); if (skb == NULL) return; #if IS_ENABLED(CONFIG_NF_CONNTRACK) nf_conntrack_put(skb->nfct); skb->nfct = &nf_ct_untracked_get()->ct_general; skb->nfctinfo = IP_CT_NEW; nf_conntrack_get(skb->nfct); #endif if (hooknum == NF_INET_PRE_ROUTING || hooknum == NF_INET_LOCAL_IN) { struct ipv6hdr *iph = ipv6_hdr(skb); --iph->hop_limit; } if (nf_dup_ipv6_route(net, skb, gw, oif)) { __this_cpu_write(nf_skb_duplicated, true); ip6_local_out(net, skb->sk, skb); __this_cpu_write(nf_skb_duplicated, false); } else { kfree_skb(skb); } }

Contributors

PersonTokensPropCommitsCommitProp
pablo neira ayusopablo neira ayuso15292.12%240.00%
eric w. biedermaneric w. biederman137.88%360.00%
Total165100.00%5100.00%

EXPORT_SYMBOL_GPL(nf_dup_ipv6); MODULE_AUTHOR("Sebastian Claßen <sebastian.classen@freenet.ag>"); MODULE_AUTHOR("Jan Engelhardt <jengelh@medozas.de>"); MODULE_DESCRIPTION("nf_dup_ipv6: IPv6 packet duplication"); MODULE_LICENSE("GPL");

Overall Contributors

PersonTokensPropCommitsCommitProp
pablo neira ayusopablo neira ayuso38393.41%337.50%
eric w. biedermaneric w. biederman184.39%337.50%
paolo abenipaolo abeni61.46%112.50%
daniel borkmanndaniel borkmann30.73%112.50%
Total410100.00%8100.00%
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.
{% endraw %}