Release 4.7 net/ipv4/netfilter.c
/*
* IPv4 specific functions of netfilter core
*
* Rusty Russell (C) 2000 -- This code is GPL.
* Patrick McHardy (C) 2006-2012
*/
#include <linux/kernel.h>
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/ip.h>
#include <linux/skbuff.h>
#include <linux/gfp.h>
#include <linux/export.h>
#include <net/route.h>
#include <net/xfrm.h>
#include <net/ip.h>
#include <net/netfilter/nf_queue.h>
/* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
int ip_route_me_harder(struct net *net, struct sk_buff *skb, unsigned int addr_type)
{
const struct iphdr *iph = ip_hdr(skb);
struct rtable *rt;
struct flowi4 fl4 = {};
__be32 saddr = iph->saddr;
__u8 flags = skb->sk ? inet_sk_flowi_flags(skb->sk) : 0;
unsigned int hh_len;
if (addr_type == RTN_UNSPEC)
addr_type = inet_addr_type(net, saddr);
if (addr_type == RTN_LOCAL || addr_type == RTN_UNICAST)
flags |= FLOWI_FLAG_ANYSRC;
else
saddr = 0;
/* some non-standard hacks like ipt_REJECT.c:send_reset() can cause
* packets with foreign saddr to appear on the NF_INET_LOCAL_OUT hook.
*/
fl4.daddr = iph->daddr;
fl4.saddr = saddr;
fl4.flowi4_tos = RT_TOS(iph->tos);
fl4.flowi4_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0;
fl4.flowi4_mark = skb->mark;
fl4.flowi4_flags = flags;
rt = ip_route_output_key(net, &fl4);
if (IS_ERR(rt))
return PTR_ERR(rt);
/* Drop old route. */
skb_dst_drop(skb);
skb_dst_set(skb, &rt->dst);
if (skb_dst(skb)->error)
return skb_dst(skb)->error;
#ifdef CONFIG_XFRM
if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
xfrm_decode_session(skb, flowi4_to_flowi(&fl4), AF_INET) == 0) {
struct dst_entry *dst = skb_dst(skb);
skb_dst_set(skb, NULL);
dst = xfrm_lookup(net, dst, flowi4_to_flowi(&fl4), skb->sk, 0);
if (IS_ERR(dst))
return PTR_ERR(dst);
skb_dst_set(skb, dst);
}
#endif
/* Change in oif may mean change in hh_len. */
hh_len = skb_dst(skb)->dev->hard_header_len;
if (skb_headroom(skb) < hh_len &&
pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)),
0, GFP_ATOMIC))
return -ENOMEM;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
harald welte | harald welte | 113 | 31.83% | 1 | 4.55% |
patrick mchardy | patrick mchardy | 60 | 16.90% | 3 | 13.64% |
julian anastasov | julian anastasov | 43 | 12.11% | 2 | 9.09% |
david s. miller | david s. miller | 41 | 11.55% | 3 | 13.64% |
eric dumazet | eric dumazet | 38 | 10.70% | 2 | 9.09% |
herbert xu | herbert xu | 26 | 7.32% | 2 | 9.09% |
simon horman | simon horman | 13 | 3.66% | 1 | 4.55% |
eric w. biederman | eric w. biederman | 5 | 1.41% | 1 | 4.55% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 4 | 1.13% | 1 | 4.55% |
kovacs krisztian | kovacs krisztian | 3 | 0.85% | 1 | 4.55% |
paul guo | paul guo | 3 | 0.85% | 1 | 4.55% |
alexey dobriyan | alexey dobriyan | 3 | 0.85% | 2 | 9.09% |
denis v. lunev | denis v. lunev | 2 | 0.56% | 1 | 4.55% |
thomas graf | thomas graf | 1 | 0.28% | 1 | 4.55% |
| Total | 355 | 100.00% | 22 | 100.00% |
EXPORT_SYMBOL(ip_route_me_harder);
/*
* Extra routing may needed on local out, as the QUEUE target never
* returns control to the table.
*/
struct ip_rt_info {
__be32 daddr;
__be32 saddr;
u_int8_t tos;
u_int32_t mark;
};
static void nf_ip_saveroute(const struct sk_buff *skb,
struct nf_queue_entry *entry)
{
struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
if (entry->state.hook == NF_INET_LOCAL_OUT) {
const struct iphdr *iph = ip_hdr(skb);
rt_info->tos = iph->tos;
rt_info->daddr = iph->daddr;
rt_info->saddr = iph->saddr;
rt_info->mark = skb->mark;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
harald welte | harald welte | 62 | 75.61% | 1 | 14.29% |
eric leblond | eric leblond | 8 | 9.76% | 1 | 14.29% |
patrick mchardy | patrick mchardy | 7 | 8.54% | 3 | 42.86% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 3 | 3.66% | 1 | 14.29% |
david s. miller | david s. miller | 2 | 2.44% | 1 | 14.29% |
| Total | 82 | 100.00% | 7 | 100.00% |
static int nf_ip_reroute(struct net *net, struct sk_buff *skb,
const struct nf_queue_entry *entry)
{
const struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
if (entry->state.hook == NF_INET_LOCAL_OUT) {
const struct iphdr *iph = ip_hdr(skb);
if (!(iph->tos == rt_info->tos &&
skb->mark == rt_info->mark &&
iph->daddr == rt_info->daddr &&
iph->saddr == rt_info->saddr))
return ip_route_me_harder(net, skb, RTN_UNSPEC);
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
harald welte | harald welte | 73 | 68.87% | 1 | 9.09% |
eric leblond | eric leblond | 8 | 7.55% | 1 | 9.09% |
eric w. biederman | eric w. biederman | 7 | 6.60% | 2 | 18.18% |
patrick mchardy | patrick mchardy | 7 | 6.60% | 3 | 27.27% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 4 | 3.77% | 1 | 9.09% |
herbert xu | herbert xu | 3 | 2.83% | 1 | 9.09% |
simon horman | simon horman | 2 | 1.89% | 1 | 9.09% |
david s. miller | david s. miller | 2 | 1.89% | 1 | 9.09% |
| Total | 106 | 100.00% | 11 | 100.00% |
__sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol)
{
const struct iphdr *iph = ip_hdr(skb);
__sum16 csum = 0;
switch (skb->ip_summed) {
case CHECKSUM_COMPLETE:
if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN)
break;
if ((protocol == 0 && !csum_fold(skb->csum)) ||
!csum_tcpudp_magic(iph->saddr, iph->daddr,
skb->len - dataoff, protocol,
skb->csum)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
break;
}
/* fall through */
case CHECKSUM_NONE:
if (protocol == 0)
skb->csum = 0;
else
skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr,
skb->len - dataoff,
protocol, 0);
csum = __skb_checksum_complete(skb);
}
return csum;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
patrick mchardy | patrick mchardy | 154 | 96.25% | 3 | 60.00% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 4 | 2.50% | 1 | 20.00% |
al viro | al viro | 2 | 1.25% | 1 | 20.00% |
| Total | 160 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL(nf_ip_checksum);
static __sum16 nf_ip_checksum_partial(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, unsigned int len,
u_int8_t protocol)
{
const struct iphdr *iph = ip_hdr(skb);
__sum16 csum = 0;
switch (skb->ip_summed) {
case CHECKSUM_COMPLETE:
if (len == skb->len - dataoff)
return nf_ip_checksum(skb, hook, dataoff, protocol);
/* fall through */
case CHECKSUM_NONE:
skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, protocol,
skb->len - dataoff, 0);
skb->ip_summed = CHECKSUM_NONE;
return __skb_checksum_complete_head(skb, dataoff + len);
}
return csum;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
patrick mchardy | patrick mchardy | 121 | 98.37% | 1 | 50.00% |
shan wei | shan wei | 2 | 1.63% | 1 | 50.00% |
| Total | 123 | 100.00% | 2 | 100.00% |
static int nf_ip_route(struct net *net, struct dst_entry **dst,
struct flowi *fl, bool strict __always_unused)
{
struct rtable *rt = ip_route_output_key(net, &fl->u.ip4);
if (IS_ERR(rt))
return PTR_ERR(rt);
*dst = &rt->dst;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
david s. miller | david s. miller | 34 | 50.75% | 2 | 33.33% |
patrick mchardy | patrick mchardy | 22 | 32.84% | 1 | 16.67% |
florian westphal | florian westphal | 10 | 14.93% | 2 | 33.33% |
denis v. lunev | denis v. lunev | 1 | 1.49% | 1 | 16.67% |
| Total | 67 | 100.00% | 6 | 100.00% |
static const struct nf_afinfo nf_ip_afinfo = {
.family = AF_INET,
.checksum = nf_ip_checksum,
.checksum_partial = nf_ip_checksum_partial,
.route = nf_ip_route,
.saveroute = nf_ip_saveroute,
.reroute = nf_ip_reroute,
.route_key_size = sizeof(struct ip_rt_info),
};
static int __init ipv4_netfilter_init(void)
{
return nf_register_afinfo(&nf_ip_afinfo);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
harald welte | harald welte | 12 | 75.00% | 1 | 25.00% |
patrick mchardy | patrick mchardy | 2 | 12.50% | 1 | 25.00% |
andrew morton | andrew morton | 1 | 6.25% | 1 | 25.00% |
jan beulich | jan beulich | 1 | 6.25% | 1 | 25.00% |
| Total | 16 | 100.00% | 4 | 100.00% |
subsys_initcall(ipv4_netfilter_init);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
patrick mchardy | patrick mchardy | 421 | 41.11% | 13 | 28.26% |
harald welte | harald welte | 311 | 30.37% | 2 | 4.35% |
david s. miller | david s. miller | 79 | 7.71% | 4 | 8.70% |
julian anastasov | julian anastasov | 43 | 4.20% | 2 | 4.35% |
eric dumazet | eric dumazet | 38 | 3.71% | 2 | 4.35% |
herbert xu | herbert xu | 32 | 3.12% | 2 | 4.35% |
eric leblond | eric leblond | 19 | 1.86% | 1 | 2.17% |
arnaldo carvalho de melo | arnaldo carvalho de melo | 15 | 1.46% | 1 | 2.17% |
simon horman | simon horman | 15 | 1.46% | 1 | 2.17% |
eric w. biederman | eric w. biederman | 12 | 1.17% | 2 | 4.35% |
florian westphal | florian westphal | 10 | 0.98% | 2 | 4.35% |
al viro | al viro | 4 | 0.39% | 2 | 4.35% |
paul gortmaker | paul gortmaker | 4 | 0.39% | 2 | 4.35% |
paul guo | paul guo | 3 | 0.29% | 1 | 2.17% |
denis v. lunev | denis v. lunev | 3 | 0.29% | 1 | 2.17% |
kovacs krisztian | kovacs krisztian | 3 | 0.29% | 1 | 2.17% |
tejun heo | tejun heo | 3 | 0.29% | 1 | 2.17% |
alexey dobriyan | alexey dobriyan | 3 | 0.29% | 2 | 4.35% |
shan wei | shan wei | 2 | 0.20% | 1 | 2.17% |
andrew morton | andrew morton | 2 | 0.20% | 1 | 2.17% |
jan beulich | jan beulich | 1 | 0.10% | 1 | 2.17% |
thomas graf | thomas graf | 1 | 0.10% | 1 | 2.17% |
| Total | 1024 | 100.00% | 46 | 100.00% |
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