linux/generic: add kernel 2.6.36 preliminary support

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@22832 3c298f89-4303-0410-b956-a3cf2f4a3e73

1 files changed, 149 insertions, 0 deletions

diff --git a/target/linux/generic/patches-2.6.36/110-netfilter_match_speedup.patch b/target/linux/generic/patches-2.6.36/110-netfilter_match_speedup.patch
new file mode 100644
index 000000000..7affbb122
--- /dev/null
+++ b/target/linux/generic/patches-2.6.36/110-netfilter_match_speedup.patch
@@ -0,0 +1,149 @@
+--- a/include/linux/netfilter_ipv4/ip_tables.h
++++ b/include/linux/netfilter_ipv4/ip_tables.h
+@@ -62,6 +62,7 @@ struct ipt_ip {
+ #define IPT_F_FRAG		0x01	/* Set if rule is a fragment rule */
+ #define IPT_F_GOTO		0x02	/* Set if jump is a goto */
+ #define IPT_F_MASK		0x03	/* All possible flag bits mask. */
++#define IPT_F_NO_DEF_MATCH	0x80	/* Internal: no default match rules present */
+ 
+ /* Values for "inv" field in struct ipt_ip. */
+ #define IPT_INV_VIA_IN		0x01	/* Invert the sense of IN IFACE. */
+--- a/net/ipv4/netfilter/ip_tables.c
++++ b/net/ipv4/netfilter/ip_tables.c
+@@ -90,6 +90,9 @@ ip_packet_match(const struct iphdr *ip,
+ 
+ #define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg)))
+ 
++	if (ipinfo->flags & IPT_F_NO_DEF_MATCH)
++		return true;
++
+ 	if (FWINV((ip->saddr&ipinfo->smsk.s_addr) != ipinfo->src.s_addr,
+ 		  IPT_INV_SRCIP) ||
+ 	    FWINV((ip->daddr&ipinfo->dmsk.s_addr) != ipinfo->dst.s_addr,
+@@ -140,13 +143,35 @@ ip_packet_match(const struct iphdr *ip,
+ 		return false;
+ 	}
+ 
++#undef FWINV
+ 	return true;
+ }
+ 
+ static bool
+-ip_checkentry(const struct ipt_ip *ip)
++ip_checkentry(struct ipt_ip *ip)
+ {
+-	if (ip->flags & ~IPT_F_MASK) {
++#define FWINV(bool, invflg) ((bool) || (ip->invflags & (invflg)))
++
++	if (FWINV(ip->smsk.s_addr, IPT_INV_SRCIP) ||
++		FWINV(ip->dmsk.s_addr, IPT_INV_DSTIP))
++		goto has_match_rules;
++
++	if (FWINV(!!((const unsigned long *)ip->iniface_mask)[0],
++		IPT_INV_VIA_IN) ||
++	    FWINV(!!((const unsigned long *)ip->outiface_mask)[0],
++		IPT_INV_VIA_OUT))
++		goto has_match_rules;
++
++	if (FWINV(ip->proto, IPT_INV_PROTO))
++		goto has_match_rules;
++
++	if (FWINV(ip->flags&IPT_F_FRAG, IPT_INV_FRAG))
++		goto has_match_rules;
++
++	ip->flags |= IPT_F_NO_DEF_MATCH;
++
++has_match_rules:
++	if (ip->flags & ~(IPT_F_MASK|IPT_F_NO_DEF_MATCH)) {
+ 		duprintf("Unknown flag bits set: %08X\n",
+ 			 ip->flags & ~IPT_F_MASK);
+ 		return false;
+@@ -156,6 +181,8 @@ ip_checkentry(const struct ipt_ip *ip)
+ 			 ip->invflags & ~IPT_INV_MASK);
+ 		return false;
+ 	}
++
++#undef FWINV
+ 	return true;
+ }
+ 
+@@ -182,7 +209,6 @@ static inline bool unconditional(const s
+ 	static const struct ipt_ip uncond;
+ 
+ 	return memcmp(ip, &uncond, sizeof(uncond)) == 0;
+-#undef FWINV
+ }
+ 
+ /* for const-correctness */
+@@ -312,8 +338,29 @@ ipt_do_table(struct sk_buff *skb,
+ 	const struct xt_table_info *private;
+ 	struct xt_action_param acpar;
+ 
+-	/* Initialization */
+ 	ip = ip_hdr(skb);
++
++	IP_NF_ASSERT(table->valid_hooks & (1 << hook));
++	xt_info_rdlock_bh();
++	private = table->private;
++	cpu        = smp_processor_id();
++	table_base = private->entries[cpu];
++	e = get_entry(table_base, private->hook_entry[hook]);
++
++	if (e->target_offset <= sizeof(struct ipt_entry) &&
++		(e->ip.flags & IPT_F_NO_DEF_MATCH)) {
++			struct ipt_entry_target *t = ipt_get_target(e);
++			if (!t->u.kernel.target->target) {
++				int v = ((struct ipt_standard_target *)t)->verdict;
++				if ((v < 0) && (v != IPT_RETURN)) {
++					ADD_COUNTER(e->counters, ntohs(ip->tot_len), 1);
++					xt_info_rdunlock_bh();
++					return (unsigned)(-v) - 1;
++				}
++			}
++	}
++
++	/* Initialization */
+ 	indev = in ? in->name : nulldevname;
+ 	outdev = out ? out->name : nulldevname;
+ 	/* We handle fragments by dealing with the first fragment as
+@@ -330,17 +377,10 @@ ipt_do_table(struct sk_buff *skb,
+ 	acpar.family  = NFPROTO_IPV4;
+ 	acpar.hooknum = hook;
+ 
+-	IP_NF_ASSERT(table->valid_hooks & (1 << hook));
+-	xt_info_rdlock_bh();
+-	private = table->private;
+-	cpu        = smp_processor_id();
+-	table_base = private->entries[cpu];
+ 	jumpstack  = (struct ipt_entry **)private->jumpstack[cpu];
+ 	stackptr   = per_cpu_ptr(private->stackptr, cpu);
+ 	origptr    = *stackptr;
+ 
+-	e = get_entry(table_base, private->hook_entry[hook]);
+-
+ 	pr_debug("Entering %s(hook %u); sp at %u (UF %p)\n",
+ 		 table->name, hook, origptr,
+ 		 get_entry(table_base, private->underflow[hook]));
+@@ -970,6 +1010,7 @@ copy_entries_to_user(unsigned int total_
+ 		unsigned int i;
+ 		const struct ipt_entry_match *m;
+ 		const struct ipt_entry_target *t;
++		u8 flags;
+ 
+ 		e = (struct ipt_entry *)(loc_cpu_entry + off);
+ 		if (copy_to_user(userptr + off
+@@ -980,6 +1021,14 @@ copy_entries_to_user(unsigned int total_
+ 			goto free_counters;
+ 		}
+ 
++		flags = e->ip.flags & ~IPT_F_NO_DEF_MATCH;
++		if (copy_to_user(userptr + off
++				 + offsetof(struct ipt_entry, ip.flags),
++				 &flags, sizeof(flags)) != 0) {
++			ret = -EFAULT;
++			goto free_counters;
++		}
++
+ 		for (i = sizeof(struct ipt_entry);
+ 		     i < e->target_offset;
+ 		     i += m->u.match_size) {