#include <linux/sockios.h>
#include <linux/in.h>
#include <linux/inet.h>
+#include <linux/inetdevice.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
* SNMP management statistics
*/
-DEFINE_SNMP_STAT(struct ipstats_mib, ip_statistics);
+DEFINE_SNMP_STAT(struct ipstats_mib, ip_statistics) __read_mostly;
/*
* Process Router Attention IP option
raw_rcv(last, skb2);
}
last = sk;
- nf_reset(skb);
}
}
__skb_pull(skb, ihl);
- /* Free reference early: we don't need it any more, and it may
- hold ip_conntrack module loaded indefinitely. */
- nf_reset(skb);
-
/* Point into the IP datagram, just past the header. */
skb->h.raw = skb->data;
if ((ipprot = rcu_dereference(inet_protos[hash])) != NULL) {
int ret;
- if (!ipprot->no_policy &&
- !xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
- kfree_skb(skb);
- goto out;
+ if (!ipprot->no_policy) {
+ if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) {
+ kfree_skb(skb);
+ goto out;
+ }
+ nf_reset(skb);
}
ret = ipprot->handler(skb);
if (ret < 0) {
ip_local_deliver_finish);
}
-static inline int ip_rcv_finish(struct sk_buff *skb)
+static inline int ip_rcv_options(struct sk_buff *skb)
{
+ struct ip_options *opt;
+ struct iphdr *iph;
struct net_device *dev = skb->dev;
+
+ /* It looks as overkill, because not all
+ IP options require packet mangling.
+ But it is the easiest for now, especially taking
+ into account that combination of IP options
+ and running sniffer is extremely rare condition.
+ --ANK (980813)
+ */
+ if (skb_cow(skb, skb_headroom(skb))) {
+ IP_INC_STATS_BH(IPSTATS_MIB_INDISCARDS);
+ goto drop;
+ }
+
+ iph = skb->nh.iph;
+
+ if (ip_options_compile(NULL, skb)) {
+ IP_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
+ goto drop;
+ }
+
+ opt = &(IPCB(skb)->opt);
+ if (unlikely(opt->srr)) {
+ struct in_device *in_dev = in_dev_get(dev);
+ if (in_dev) {
+ if (!IN_DEV_SOURCE_ROUTE(in_dev)) {
+ if (IN_DEV_LOG_MARTIANS(in_dev) &&
+ net_ratelimit())
+ printk(KERN_INFO "source route option "
+ "%u.%u.%u.%u -> %u.%u.%u.%u\n",
+ NIPQUAD(iph->saddr),
+ NIPQUAD(iph->daddr));
+ in_dev_put(in_dev);
+ goto drop;
+ }
+
+ in_dev_put(in_dev);
+ }
+
+ if (ip_options_rcv_srr(skb))
+ goto drop;
+ }
+
+ return 0;
+drop:
+ return -1;
+}
+
+static inline int ip_rcv_finish(struct sk_buff *skb)
+{
struct iphdr *iph = skb->nh.iph;
- int err;
/*
* Initialise the virtual path cache for the packet. It describes
* how the packet travels inside Linux networking.
*/
if (skb->dst == NULL) {
- if ((err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos, dev))) {
+ int err = ip_route_input(skb, iph->daddr, iph->saddr, iph->tos,
+ skb->dev);
+ if (unlikely(err)) {
if (err == -EHOSTUNREACH)
IP_INC_STATS_BH(IPSTATS_MIB_INADDRERRORS);
goto drop;
}
#ifdef CONFIG_NET_CLS_ROUTE
- if (skb->dst->tclassid) {
+ if (unlikely(skb->dst->tclassid)) {
struct ip_rt_acct *st = ip_rt_acct + 256*smp_processor_id();
u32 idx = skb->dst->tclassid;
st[idx&0xFF].o_packets++;
}
#endif
- if (iph->ihl > 5) {
- struct ip_options *opt;
-
- /* It looks as overkill, because not all
- IP options require packet mangling.
- But it is the easiest for now, especially taking
- into account that combination of IP options
- and running sniffer is extremely rare condition.
- --ANK (980813)
- */
-
- if (skb_cow(skb, skb_headroom(skb))) {
- IP_INC_STATS_BH(IPSTATS_MIB_INDISCARDS);
- goto drop;
- }
- iph = skb->nh.iph;
-
- if (ip_options_compile(NULL, skb))
- goto inhdr_error;
-
- opt = &(IPCB(skb)->opt);
- if (opt->srr) {
- struct in_device *in_dev = in_dev_get(dev);
- if (in_dev) {
- if (!IN_DEV_SOURCE_ROUTE(in_dev)) {
- if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit())
- printk(KERN_INFO "source route option %u.%u.%u.%u -> %u.%u.%u.%u\n",
- NIPQUAD(iph->saddr), NIPQUAD(iph->daddr));
- in_dev_put(in_dev);
- goto drop;
- }
- in_dev_put(in_dev);
- }
- if (ip_options_rcv_srr(skb))
- goto drop;
- }
- }
+ if (iph->ihl > 5 && ip_rcv_options(skb))
+ goto drop;
return dst_input(skb);
-inhdr_error:
- IP_INC_STATS_BH(IPSTATS_MIB_INHDRERRORS);
drop:
kfree_skb(skb);
return NET_RX_DROP;
iph = skb->nh.iph;
- if (ip_fast_csum((u8 *)iph, iph->ihl) != 0)
+ if (unlikely(ip_fast_csum((u8 *)iph, iph->ihl)))
goto inhdr_error;
len = ntohs(iph->tot_len);
return NET_RX_DROP;
}
-EXPORT_SYMBOL(ip_rcv);
EXPORT_SYMBOL(ip_statistics);