mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 05:48:40 +00:00
![Harald Welte](/assets/img/avatar_default.png)
Netfilter cleanup - Move ipv4 code from net/core/netfilter.c to net/ipv4/netfilter.c - Move ipv6 netfilter code from net/ipv6/ip6_output.c to net/ipv6/netfilter.c Signed-off-by: Harald Welte <laforge@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
79 lines
2 KiB
C
79 lines
2 KiB
C
#include <linux/config.h>
|
|
|
|
#ifdef CONFIG_NETFILTER
|
|
|
|
/* IPv4 specific functions of netfilter core */
|
|
#include <linux/kernel.h>
|
|
#include <linux/netfilter.h>
|
|
|
|
#include <linux/tcp.h>
|
|
#include <linux/udp.h>
|
|
#include <linux/icmp.h>
|
|
#include <net/route.h>
|
|
#include <linux/ip.h>
|
|
|
|
/* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
|
|
int ip_route_me_harder(struct sk_buff **pskb)
|
|
{
|
|
struct iphdr *iph = (*pskb)->nh.iph;
|
|
struct rtable *rt;
|
|
struct flowi fl = {};
|
|
struct dst_entry *odst;
|
|
unsigned int hh_len;
|
|
|
|
/* some non-standard hacks like ipt_REJECT.c:send_reset() can cause
|
|
* packets with foreign saddr to appear on the NF_IP_LOCAL_OUT hook.
|
|
*/
|
|
if (inet_addr_type(iph->saddr) == RTN_LOCAL) {
|
|
fl.nl_u.ip4_u.daddr = iph->daddr;
|
|
fl.nl_u.ip4_u.saddr = iph->saddr;
|
|
fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
|
|
fl.oif = (*pskb)->sk ? (*pskb)->sk->sk_bound_dev_if : 0;
|
|
#ifdef CONFIG_IP_ROUTE_FWMARK
|
|
fl.nl_u.ip4_u.fwmark = (*pskb)->nfmark;
|
|
#endif
|
|
fl.proto = iph->protocol;
|
|
if (ip_route_output_key(&rt, &fl) != 0)
|
|
return -1;
|
|
|
|
/* Drop old route. */
|
|
dst_release((*pskb)->dst);
|
|
(*pskb)->dst = &rt->u.dst;
|
|
} else {
|
|
/* non-local src, find valid iif to satisfy
|
|
* rp-filter when calling ip_route_input. */
|
|
fl.nl_u.ip4_u.daddr = iph->saddr;
|
|
if (ip_route_output_key(&rt, &fl) != 0)
|
|
return -1;
|
|
|
|
odst = (*pskb)->dst;
|
|
if (ip_route_input(*pskb, iph->daddr, iph->saddr,
|
|
RT_TOS(iph->tos), rt->u.dst.dev) != 0) {
|
|
dst_release(&rt->u.dst);
|
|
return -1;
|
|
}
|
|
dst_release(&rt->u.dst);
|
|
dst_release(odst);
|
|
}
|
|
|
|
if ((*pskb)->dst->error)
|
|
return -1;
|
|
|
|
/* Change in oif may mean change in hh_len. */
|
|
hh_len = (*pskb)->dst->dev->hard_header_len;
|
|
if (skb_headroom(*pskb) < hh_len) {
|
|
struct sk_buff *nskb;
|
|
|
|
nskb = skb_realloc_headroom(*pskb, hh_len);
|
|
if (!nskb)
|
|
return -1;
|
|
if ((*pskb)->sk)
|
|
skb_set_owner_w(nskb, (*pskb)->sk);
|
|
kfree_skb(*pskb);
|
|
*pskb = nskb;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ip_route_me_harder);
|
|
#endif /* CONFIG_NETFILTER */
|