#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/ip.h>
+#include <linux/skbuff.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 sk_buff **pskb)
+int ip_route_me_harder(struct sk_buff *skb, unsigned addr_type)
{
- struct iphdr *iph = (*pskb)->nh.iph;
+ struct net *net = dev_net(skb_dst(skb)->dev);
+ const struct iphdr *iph = ip_hdr(skb);
struct rtable *rt;
struct flowi fl = {};
struct dst_entry *odst;
unsigned int hh_len;
+ unsigned int type;
+
+ type = inet_addr_type(net, iph->saddr);
+ if (skb->sk && inet_sk(skb->sk)->transparent)
+ type = RTN_LOCAL;
+ if (addr_type == RTN_UNSPEC)
+ addr_type = type;
/* 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.
+ * packets with foreign saddr to appear on the NF_INET_LOCAL_OUT hook.
*/
- if (inet_addr_type(iph->saddr) == RTN_LOCAL) {
+ if (addr_type == RTN_LOCAL) {
fl.nl_u.ip4_u.daddr = iph->daddr;
- fl.nl_u.ip4_u.saddr = iph->saddr;
+ if (type == RTN_LOCAL)
+ 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
- if (ip_route_output_key(&rt, &fl) != 0)
+ fl.oif = skb->sk ? skb->sk->sk_bound_dev_if : 0;
+ fl.mark = skb->mark;
+ fl.flags = skb->sk ? inet_sk_flowi_flags(skb->sk) : 0;
+ if (ip_route_output_key(net, &rt, &fl) != 0)
return -1;
/* Drop old route. */
- dst_release((*pskb)->dst);
- (*pskb)->dst = &rt->u.dst;
+ skb_dst_drop(skb);
+ skb_dst_set(skb, &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)
+ if (ip_route_output_key(net, &rt, &fl) != 0)
return -1;
- odst = (*pskb)->dst;
- if (ip_route_input(*pskb, iph->daddr, iph->saddr,
+ odst = skb_dst(skb);
+ if (ip_route_input(skb, 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)
+
+ if (skb_dst(skb)->error)
return -1;
#ifdef CONFIG_XFRM
- if (!(IPCB(*pskb)->flags & IPSKB_XFRM_TRANSFORMED) &&
- xfrm_decode_session(*pskb, &fl, AF_INET) == 0)
- if (xfrm_lookup(&(*pskb)->dst, &fl, (*pskb)->sk, 0))
+ if (!(IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED) &&
+ xfrm_decode_session(skb, &fl, AF_INET) == 0) {
+ struct dst_entry *dst = skb_dst(skb);
+ skb_dst_set(skb, NULL);
+ if (xfrm_lookup(net, &dst, &fl, skb->sk, 0))
return -1;
+ skb_dst_set(skb, dst);
+ }
#endif
/* 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;
- }
+ hh_len = skb_dst(skb)->dev->hard_header_len;
+ if (skb_headroom(skb) < hh_len &&
+ pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC))
+ return -1;
return 0;
}
EXPORT_SYMBOL(ip_route_me_harder);
#ifdef CONFIG_XFRM
-int ip_xfrm_me_harder(struct sk_buff **pskb)
+int ip_xfrm_me_harder(struct sk_buff *skb)
{
struct flowi fl;
unsigned int hh_len;
struct dst_entry *dst;
- if (IPCB(*pskb)->flags & IPSKB_XFRM_TRANSFORMED)
+ if (IPCB(skb)->flags & IPSKB_XFRM_TRANSFORMED)
return 0;
- if (xfrm_decode_session(*pskb, &fl, AF_INET) < 0)
+ if (xfrm_decode_session(skb, &fl, AF_INET) < 0)
return -1;
- dst = (*pskb)->dst;
+ dst = skb_dst(skb);
if (dst->xfrm)
dst = ((struct xfrm_dst *)dst)->route;
dst_hold(dst);
- if (xfrm_lookup(&dst, &fl, (*pskb)->sk, 0) < 0)
+ if (xfrm_lookup(dev_net(dst->dev), &dst, &fl, skb->sk, 0) < 0)
return -1;
- dst_release((*pskb)->dst);
- (*pskb)->dst = dst;
+ skb_dst_drop(skb);
+ skb_dst_set(skb, dst);
/* 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;
- }
+ hh_len = skb_dst(skb)->dev->hard_header_len;
+ if (skb_headroom(skb) < hh_len &&
+ pskb_expand_head(skb, hh_len - skb_headroom(skb), 0, GFP_ATOMIC))
+ return -1;
return 0;
}
EXPORT_SYMBOL(ip_xfrm_me_harder);
*/
struct ip_rt_info {
- u_int32_t daddr;
- u_int32_t saddr;
+ __be32 daddr;
+ __be32 saddr;
u_int8_t tos;
+ u_int32_t mark;
};
-static void nf_ip_saveroute(const struct sk_buff *skb, struct nf_info *info)
+static void nf_ip_saveroute(const struct sk_buff *skb,
+ struct nf_queue_entry *entry)
{
- struct ip_rt_info *rt_info = nf_info_reroute(info);
+ struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
- if (info->hook == NF_IP_LOCAL_OUT) {
- const struct iphdr *iph = skb->nh.iph;
+ if (entry->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;
}
}
-static int nf_ip_reroute(struct sk_buff **pskb, const struct nf_info *info)
+static int nf_ip_reroute(struct sk_buff *skb,
+ const struct nf_queue_entry *entry)
{
- const struct ip_rt_info *rt_info = nf_info_reroute(info);
+ const struct ip_rt_info *rt_info = nf_queue_entry_reroute(entry);
- if (info->hook == NF_IP_LOCAL_OUT) {
- struct iphdr *iph = (*pskb)->nh.iph;
+ if (entry->hook == NF_INET_LOCAL_OUT) {
+ const struct iphdr *iph = ip_hdr(skb);
- if (!(iph->tos == rt_info->tos
- && iph->daddr == rt_info->daddr
- && iph->saddr == rt_info->saddr))
- return ip_route_me_harder(pskb);
+ 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(skb, RTN_UNSPEC);
}
return 0;
}
-unsigned int nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
+__sum16 nf_ip_checksum(struct sk_buff *skb, unsigned int hook,
unsigned int dataoff, u_int8_t protocol)
{
- struct iphdr *iph = skb->nh.iph;
- unsigned int csum = 0;
+ const struct iphdr *iph = ip_hdr(skb);
+ __sum16 csum = 0;
switch (skb->ip_summed) {
- case CHECKSUM_HW:
- if (hook != NF_IP_PRE_ROUTING && hook != NF_IP_LOCAL_IN)
+ case CHECKSUM_COMPLETE:
+ if (hook != NF_INET_PRE_ROUTING && hook != NF_INET_LOCAL_IN)
break;
- if ((protocol == 0 && !(u16)csum_fold(skb->csum)) ||
+ if ((protocol == 0 && !csum_fold(skb->csum)) ||
!csum_tcpudp_magic(iph->saddr, iph->daddr,
- skb->len - dataoff, protocol,
+ skb->len - dataoff, protocol,
skb->csum)) {
skb->ip_summed = CHECKSUM_UNNECESSARY;
break;
}
return csum;
}
-
EXPORT_SYMBOL(nf_ip_checksum);
-static struct nf_afinfo nf_ip_afinfo = {
- .family = AF_INET,
- .checksum = nf_ip_checksum,
- .saveroute = nf_ip_saveroute,
- .reroute = nf_ip_reroute,
- .route_key_size = sizeof(struct ip_rt_info),
+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;
+ csum = __skb_checksum_complete_head(skb, dataoff + len);
+ if (!csum)
+ skb->ip_summed = CHECKSUM_UNNECESSARY;
+ }
+ return csum;
+}
+
+static int nf_ip_route(struct dst_entry **dst, struct flowi *fl)
+{
+ return ip_route_output_key(&init_net, (struct rtable **)dst, fl);
+}
+
+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 ipv4_netfilter_init(void)
module_init(ipv4_netfilter_init);
module_exit(ipv4_netfilter_fini);
+
+#ifdef CONFIG_SYSCTL
+struct ctl_path nf_net_ipv4_netfilter_sysctl_path[] = {
+ { .procname = "net", },
+ { .procname = "ipv4", },
+ { .procname = "netfilter", },
+ { }
+};
+EXPORT_SYMBOL_GPL(nf_net_ipv4_netfilter_sysctl_path);
+#endif /* CONFIG_SYSCTL */
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff