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-rw-r--r--include/linux/netfilter/x_tables.h23
-rw-r--r--net/ipv4/netfilter/arp_tables.c14
-rw-r--r--net/ipv4/netfilter/ip_tables.c23
-rw-r--r--net/ipv6/netfilter/ip6_tables.c23
-rw-r--r--net/netfilter/xt_physdev.c21
5 files changed, 30 insertions, 74 deletions
diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index e8e08d03675..72918b7cbe8 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -435,6 +435,29 @@ extern void xt_free_table_info(struct xt_table_info *info);
extern void xt_table_entry_swap_rcu(struct xt_table_info *old,
struct xt_table_info *new);
+/*
+ * This helper is performance critical and must be inlined
+ */
+static inline unsigned long ifname_compare_aligned(const char *_a,
+ const char *_b,
+ const char *_mask)
+{
+ const unsigned long *a = (const unsigned long *)_a;
+ const unsigned long *b = (const unsigned long *)_b;
+ const unsigned long *mask = (const unsigned long *)_mask;
+ unsigned long ret;
+
+ ret = (a[0] ^ b[0]) & mask[0];
+ if (IFNAMSIZ > sizeof(unsigned long))
+ ret |= (a[1] ^ b[1]) & mask[1];
+ if (IFNAMSIZ > 2 * sizeof(unsigned long))
+ ret |= (a[2] ^ b[2]) & mask[2];
+ if (IFNAMSIZ > 3 * sizeof(unsigned long))
+ ret |= (a[3] ^ b[3]) & mask[3];
+ BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
+ return ret;
+}
+
#ifdef CONFIG_COMPAT
#include <net/compat.h>
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index 64a7c6ce0b9..4b35dba7cf7 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -80,19 +80,7 @@ static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
{
#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
- const unsigned long *a = (const unsigned long *)_a;
- const unsigned long *b = (const unsigned long *)_b;
- const unsigned long *mask = (const unsigned long *)_mask;
- unsigned long ret;
-
- ret = (a[0] ^ b[0]) & mask[0];
- if (IFNAMSIZ > sizeof(unsigned long))
- ret |= (a[1] ^ b[1]) & mask[1];
- if (IFNAMSIZ > 2 * sizeof(unsigned long))
- ret |= (a[2] ^ b[2]) & mask[2];
- if (IFNAMSIZ > 3 * sizeof(unsigned long))
- ret |= (a[3] ^ b[3]) & mask[3];
- BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
+ unsigned long ret = ifname_compare_aligned(_a, _b, _mask);
#else
unsigned long ret = 0;
int i;
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index e5294aec967..41c59e391a6 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -74,25 +74,6 @@ do { \
Hence the start of any table is given by get_table() below. */
-static unsigned long ifname_compare(const char *_a, const char *_b,
- const unsigned char *_mask)
-{
- const unsigned long *a = (const unsigned long *)_a;
- const unsigned long *b = (const unsigned long *)_b;
- const unsigned long *mask = (const unsigned long *)_mask;
- unsigned long ret;
-
- ret = (a[0] ^ b[0]) & mask[0];
- if (IFNAMSIZ > sizeof(unsigned long))
- ret |= (a[1] ^ b[1]) & mask[1];
- if (IFNAMSIZ > 2 * sizeof(unsigned long))
- ret |= (a[2] ^ b[2]) & mask[2];
- if (IFNAMSIZ > 3 * sizeof(unsigned long))
- ret |= (a[3] ^ b[3]) & mask[3];
- BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
- return ret;
-}
-
/* Returns whether matches rule or not. */
/* Performance critical - called for every packet */
static inline bool
@@ -121,7 +102,7 @@ ip_packet_match(const struct iphdr *ip,
return false;
}
- ret = ifname_compare(indev, ipinfo->iniface, ipinfo->iniface_mask);
+ ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask);
if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
dprintf("VIA in mismatch (%s vs %s).%s\n",
@@ -130,7 +111,7 @@ ip_packet_match(const struct iphdr *ip,
return false;
}
- ret = ifname_compare(outdev, ipinfo->outiface, ipinfo->outiface_mask);
+ ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask);
if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
dprintf("VIA out mismatch (%s vs %s).%s\n",
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index 34af7bb8df5..e59662b3b5b 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -89,25 +89,6 @@ ip6t_ext_hdr(u8 nexthdr)
(nexthdr == IPPROTO_DSTOPTS) );
}
-static unsigned long ifname_compare(const char *_a, const char *_b,
- const unsigned char *_mask)
-{
- const unsigned long *a = (const unsigned long *)_a;
- const unsigned long *b = (const unsigned long *)_b;
- const unsigned long *mask = (const unsigned long *)_mask;
- unsigned long ret;
-
- ret = (a[0] ^ b[0]) & mask[0];
- if (IFNAMSIZ > sizeof(unsigned long))
- ret |= (a[1] ^ b[1]) & mask[1];
- if (IFNAMSIZ > 2 * sizeof(unsigned long))
- ret |= (a[2] ^ b[2]) & mask[2];
- if (IFNAMSIZ > 3 * sizeof(unsigned long))
- ret |= (a[3] ^ b[3]) & mask[3];
- BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
- return ret;
-}
-
/* Returns whether matches rule or not. */
/* Performance critical - called for every packet */
static inline bool
@@ -138,7 +119,7 @@ ip6_packet_match(const struct sk_buff *skb,
return false;
}
- ret = ifname_compare(indev, ip6info->iniface, ip6info->iniface_mask);
+ ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
if (FWINV(ret != 0, IP6T_INV_VIA_IN)) {
dprintf("VIA in mismatch (%s vs %s).%s\n",
@@ -147,7 +128,7 @@ ip6_packet_match(const struct sk_buff *skb,
return false;
}
- ret = ifname_compare(outdev, ip6info->outiface, ip6info->outiface_mask);
+ ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) {
dprintf("VIA out mismatch (%s vs %s).%s\n",
diff --git a/net/netfilter/xt_physdev.c b/net/netfilter/xt_physdev.c
index 44a234ef443..8d28ca5848b 100644
--- a/net/netfilter/xt_physdev.c
+++ b/net/netfilter/xt_physdev.c
@@ -20,23 +20,6 @@ MODULE_DESCRIPTION("Xtables: Bridge physical device match");
MODULE_ALIAS("ipt_physdev");
MODULE_ALIAS("ip6t_physdev");
-static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
-{
- const unsigned long *a = (const unsigned long *)_a;
- const unsigned long *b = (const unsigned long *)_b;
- const unsigned long *mask = (const unsigned long *)_mask;
- unsigned long ret;
-
- ret = (a[0] ^ b[0]) & mask[0];
- if (IFNAMSIZ > sizeof(unsigned long))
- ret |= (a[1] ^ b[1]) & mask[1];
- if (IFNAMSIZ > 2 * sizeof(unsigned long))
- ret |= (a[2] ^ b[2]) & mask[2];
- if (IFNAMSIZ > 3 * sizeof(unsigned long))
- ret |= (a[3] ^ b[3]) & mask[3];
- BUILD_BUG_ON(IFNAMSIZ > 4 * sizeof(unsigned long));
- return ret;
-}
static bool
physdev_mt(const struct sk_buff *skb, const struct xt_match_param *par)
@@ -85,7 +68,7 @@ physdev_mt(const struct sk_buff *skb, const struct xt_match_param *par)
if (!(info->bitmask & XT_PHYSDEV_OP_IN))
goto match_outdev;
indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname;
- ret = ifname_compare(indev, info->physindev, info->in_mask);
+ ret = ifname_compare_aligned(indev, info->physindev, info->in_mask);
if (!ret ^ !(info->invert & XT_PHYSDEV_OP_IN))
return false;
@@ -95,7 +78,7 @@ match_outdev:
return true;
outdev = nf_bridge->physoutdev ?
nf_bridge->physoutdev->name : nulldevname;
- ret = ifname_compare(outdev, info->physoutdev, info->out_mask);
+ ret = ifname_compare_aligned(outdev, info->physoutdev, info->out_mask);
return (!!ret ^ !(info->invert & XT_PHYSDEV_OP_OUT));
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 18:29:20 +0000