Release 4.16 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;
const struct sock *sk = skb_to_full_sk(skb);
__u8 flags = sk ? inet_sk_flowi_flags(sk) : 0;
struct net_device *dev = skb_dst(skb)->dev;
unsigned int hh_len;
if (addr_type == RTN_UNSPEC)
addr_type = inet_addr_type_dev_table(net, dev, 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 = sk ? sk->sk_bound_dev_if : 0;
if (!fl4.flowi4_oif)
fl4.flowi4_oif = l3mdev_master_ifindex(dev);
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), 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 | 111 | 28.76% | 1 | 4.17% |
| Patrick McHardy | 59 | 15.28% | 3 | 12.50% |
| David S. Miller | 41 | 10.62% | 3 | 12.50% |
| Julian Anastasov | 38 | 9.84% | 2 | 8.33% |
| Eric Dumazet | 38 | 9.84% | 2 | 8.33% |
| David Ahern | 31 | 8.03% | 1 | 4.17% |
| Herbert Xu | 23 | 5.96% | 2 | 8.33% |
| Simon Horman | 13 | 3.37% | 1 | 4.17% |
| Florian Westphal | 11 | 2.85% | 1 | 4.17% |
| Eric W. Biedermann | 5 | 1.30% | 1 | 4.17% |
| Arnaldo Carvalho de Melo | 4 | 1.04% | 1 | 4.17% |
| Alexey Dobriyan | 3 | 0.78% | 2 | 8.33% |
| Paul Guo | 3 | 0.78% | 1 | 4.17% |
| KOVACS Krisztian | 3 | 0.78% | 1 | 4.17% |
| Denis V. Lunev | 2 | 0.52% | 1 | 4.17% |
| Thomas Graf | 1 | 0.26% | 1 | 4.17% |
| Total | 386 | 100.00% | 24 | 100.00% |
EXPORT_SYMBOL(ip_route_me_harder);
int nf_ip_reroute(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(entry->state.net, skb,
RTN_UNSPEC);
}
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Harald Welte | 72 | 69.23% | 1 | 9.09% |
| Eric Leblond | 8 | 7.69% | 1 | 9.09% |
| Patrick McHardy | 7 | 6.73% | 3 | 27.27% |
| Arnaldo Carvalho de Melo | 4 | 3.85% | 1 | 9.09% |
| Pablo Neira Ayuso | 4 | 3.85% | 1 | 9.09% |
| Herbert Xu | 3 | 2.88% | 1 | 9.09% |
| Simon Horman | 2 | 1.92% | 1 | 9.09% |
| Eric W. Biedermann | 2 | 1.92% | 1 | 9.09% |
| David S. Miller | 2 | 1.92% | 1 | 9.09% |
| Total | 104 | 100.00% | 11 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ip_reroute);
__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 | 154 | 96.25% | 3 | 60.00% |
| Arnaldo Carvalho de Melo | 4 | 2.50% | 1 | 20.00% |
| Al Viro | 2 | 1.25% | 1 | 20.00% |
| Total | 160 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL(nf_ip_checksum);
__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 | 120 | 98.36% | 1 | 50.00% |
| Shan Wei | 2 | 1.64% | 1 | 50.00% |
| Total | 122 | 100.00% | 2 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ip_checksum_partial);
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 | 34 | 51.52% | 2 | 33.33% |
| Patrick McHardy | 21 | 31.82% | 1 | 16.67% |
| Florian Westphal | 10 | 15.15% | 2 | 33.33% |
| Denis V. Lunev | 1 | 1.52% | 1 | 16.67% |
| Total | 66 | 100.00% | 6 | 100.00% |
EXPORT_SYMBOL_GPL(nf_ip_route);
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Patrick McHardy | 377 | 41.98% | 12 | 26.67% |
| Harald Welte | 203 | 22.61% | 2 | 4.44% |
| David S. Miller | 77 | 8.57% | 4 | 8.89% |
| Julian Anastasov | 38 | 4.23% | 2 | 4.44% |
| Eric Dumazet | 38 | 4.23% | 2 | 4.44% |
| David Ahern | 31 | 3.45% | 1 | 2.22% |
| Herbert Xu | 29 | 3.23% | 2 | 4.44% |
| Florian Westphal | 21 | 2.34% | 3 | 6.67% |
| Pablo Neira Ayuso | 19 | 2.12% | 3 | 6.67% |
| Simon Horman | 15 | 1.67% | 1 | 2.22% |
| Arnaldo Carvalho de Melo | 12 | 1.34% | 1 | 2.22% |
| Eric Leblond | 8 | 0.89% | 1 | 2.22% |
| Eric W. Biedermann | 7 | 0.78% | 1 | 2.22% |
| Paul Guo | 3 | 0.33% | 1 | 2.22% |
| KOVACS Krisztian | 3 | 0.33% | 1 | 2.22% |
| Denis V. Lunev | 3 | 0.33% | 1 | 2.22% |
| Alexey Dobriyan | 3 | 0.33% | 2 | 4.44% |
| Tejun Heo | 3 | 0.33% | 1 | 2.22% |
| Paul Gortmaker | 3 | 0.33% | 1 | 2.22% |
| Al Viro | 2 | 0.22% | 1 | 2.22% |
| Shan Wei | 2 | 0.22% | 1 | 2.22% |
| Thomas Graf | 1 | 0.11% | 1 | 2.22% |
| Total | 898 | 100.00% | 45 | 100.00% |
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