commit 98e86403162d08a30b03426c54c2a8fca1f695d1
Author: Jan Engelhardt <jengelh@xxxxxxxxxx>
Date: Wed Apr 15 21:06:05 2009 +0200
netfilter: xtables: consolidate open-coded logic
Signed-off-by: Jan Engelhardt <jengelh@xxxxxxxxxx>
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 820252a..2455583 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -142,6 +142,12 @@ static inline int ebt_basic_match(struct ebt_entry *e, struct ethhdr *h,
return 0;
}
+static inline __pure
+struct ebt_entry *ebt_next_entry(const struct ebt_entry *entry)
+{
+ return (void *)entry + entry->next_offset;
+}
+
/* Do some firewalling */
unsigned int ebt_do_table (unsigned int hook, struct sk_buff *skb,
const struct net_device *in, const struct net_device *out,
@@ -249,8 +255,7 @@ letsreturn:
/* jump to a udc */
cs[sp].n = i + 1;
cs[sp].chaininfo = chaininfo;
- cs[sp].e = (struct ebt_entry *)
- (((char *)point) + point->next_offset);
+ cs[sp].e = ebt_next_entry(point);
i = 0;
chaininfo = (struct ebt_entries *) (base + verdict);
#ifdef CONFIG_NETFILTER_DEBUG
@@ -266,8 +271,7 @@ letsreturn:
sp++;
continue;
letscontinue:
- point = (struct ebt_entry *)
- (((char *)point) + point->next_offset);
+ point = ebt_next_entry(point);
i++;
}
@@ -787,7 +791,7 @@ static int check_chainloops(struct ebt_entries *chain, struct ebt_cl_stack *cl_s
/* this can't be 0, so the loop test is correct */
cl_s[i].cs.n = pos + 1;
pos = 0;
- cl_s[i].cs.e = ((void *)e + e->next_offset);
+ cl_s[i].cs.e = ebt_next_entry(e);
e = (struct ebt_entry *)(hlp2->data);
nentries = hlp2->nentries;
cl_s[i].from = chain_nr;
@@ -797,7 +801,7 @@ static int check_chainloops(struct ebt_entries *chain, struct ebt_cl_stack *cl_s
continue;
}
letscontinue:
- e = (void *)e + e->next_offset;
+ e = ebt_next_entry(e);
pos++;
}
return 0;
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 831fe18..940e54b 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -231,6 +231,12 @@ static inline struct arpt_entry *get_entry(void *base, unsigned int offset)
return (struct arpt_entry *)(base + offset);
}
+static inline __pure
+struct arpt_entry *arpt_next_entry(const struct arpt_entry *entry)
+{
+ return (void *)entry + entry->next_offset;
+}
+
unsigned int arpt_do_table(struct sk_buff *skb,
unsigned int hook,
const struct net_device *in,
@@ -295,10 +301,10 @@ unsigned int arpt_do_table(struct sk_buff *skb,
continue;
}
if (table_base + v
- != (void *)e + e->next_offset) {
+ != arpt_next_entry(e)) {
/* Save old back ptr in next entry */
struct arpt_entry *next
- = (void *)e + e->next_offset;
+ = arpt_next_entry(e);
next->comefrom =
(void *)back - table_base;
@@ -320,13 +326,13 @@ unsigned int arpt_do_table(struct sk_buff *skb,
arp = arp_hdr(skb);
if (verdict == ARPT_CONTINUE)
- e = (void *)e + e->next_offset;
+ e = arpt_next_entry(e);
else
/* Verdict */
break;
}
} else {
- e = (void *)e + e->next_offset;
+ e = arpt_next_entry(e);
}
} while (!hotdrop);
xt_info_rdunlock_bh();
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 16b7c09..7ec4e40 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -297,6 +297,12 @@ static void trace_packet(struct sk_buff *skb,
}
#endif
+static inline __pure
+struct ipt_entry *ipt_next_entry(const struct ipt_entry *entry)
+{
+ return (void *)entry + entry->next_offset;
+}
+
/* Returns one of the generic firewall policies, like NF_ACCEPT. */
unsigned int
ipt_do_table(struct sk_buff *skb,
@@ -385,11 +391,11 @@ ipt_do_table(struct sk_buff *skb,
back->comefrom);
continue;
}
- if (table_base + v != (void *)e + e->next_offset
+ if (table_base + v != ipt_next_entry(e)
&& !(e->ip.flags & IPT_F_GOTO)) {
/* Save old back ptr in next entry */
struct ipt_entry *next
- = (void *)e + e->next_offset;
+ = ipt_next_entry(e);
next->comefrom
= (void *)back - table_base;
/* set back pointer to next entry */
@@ -424,7 +430,7 @@ ipt_do_table(struct sk_buff *skb,
datalen = skb->len - ip->ihl * 4;
if (verdict == IPT_CONTINUE)
- e = (void *)e + e->next_offset;
+ e = ipt_next_entry(e);
else
/* Verdict */
break;
@@ -432,7 +438,7 @@ ipt_do_table(struct sk_buff *skb,
} else {
no_match:
- e = (void *)e + e->next_offset;
+ e = ipt_next_entry(e);
}
} while (!hotdrop);
xt_info_rdunlock_bh();
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 4853a3d..9176e98 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -329,6 +329,12 @@ static void trace_packet(struct sk_buff *skb,
}
#endif
+static inline __pure struct ip6t_entry *
+ip6t_next_entry(const struct ip6t_entry *entry)
+{
+ return (void *)entry + entry->next_offset;
+}
+
/* Returns one of the generic firewall policies, like NF_ACCEPT. */
unsigned int
ip6t_do_table(struct sk_buff *skb,
@@ -414,11 +420,11 @@ ip6t_do_table(struct sk_buff *skb,
back->comefrom);
continue;
}
- if (table_base + v != (void *)e + e->next_offset
+ if (table_base + v != ip6t_next_entry(e)
&& !(e->ipv6.flags & IP6T_F_GOTO)) {
/* Save old back ptr in next entry */
struct ip6t_entry *next
- = (void *)e + e->next_offset;
+ = ip6t_next_entry(e);
next->comefrom
= (void *)back - table_base;
/* set back pointer to next entry */
@@ -451,7 +457,7 @@ ip6t_do_table(struct sk_buff *skb,
= 0x57acc001;
#endif
if (verdict == IP6T_CONTINUE)
- e = (void *)e + e->next_offset;
+ e = ip6t_next_entry(e);
else
/* Verdict */
break;
@@ -459,7 +465,7 @@ ip6t_do_table(struct sk_buff *skb,
} else {
no_match:
- e = (void *)e + e->next_offset;
+ e = ip6t_next_entry(e);
}
} while (!hotdrop);
--
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