[PATCH 2/3] x_tables: Use also dev->ifalias for interface matching
From: Richard Weinberger
Date: Sun Jan 11 2015 - 15:53:45 EST
Signed-off-by: Richard Weinberger <richard@xxxxxx>
---
include/linux/netfilter/x_tables.h | 22 ++++++++++++++++++++++
net/ipv4/netfilter/arp_tables.c | 28 +++++++++++++++++-----------
net/ipv4/netfilter/ip_tables.c | 15 +++++----------
net/ipv6/netfilter/ip6_tables.c | 18 +++++++-----------
net/netfilter/xt_physdev.c | 9 ++-------
5 files changed, 53 insertions(+), 39 deletions(-)
diff --git a/include/linux/netfilter/x_tables.h b/include/linux/netfilter/x_tables.h
index a3e215b..15bda23 100644
--- a/include/linux/netfilter/x_tables.h
+++ b/include/linux/netfilter/x_tables.h
@@ -351,6 +351,28 @@ static inline unsigned long ifname_compare_aligned(const char *_a,
return ret;
}
+/*
+ * A wrapper around ifname_compare_aligned() to match against dev->name and
+ * dev->ifalias.
+ */
+static inline unsigned long ifname_compare_all(const struct net_device *dev,
+ const char *name,
+ const char *mask)
+{
+ unsigned long res = 0;
+
+ if (!dev)
+ goto out;
+
+ res = ifname_compare_aligned(dev->name, name, mask);
+ if (unlikely(dev->ifalias && res))
+ res = ifname_compare_aligned(dev->ifalias, name, mask);
+
+out:
+ return res;
+}
+
+
struct nf_hook_ops *xt_hook_link(const struct xt_table *, nf_hookfn *);
void xt_hook_unlink(const struct xt_table *, struct nf_hook_ops *);
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index f95b6f9..457d4ed 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -81,19 +81,30 @@ static inline int arp_devaddr_compare(const struct arpt_devaddr_info *ap,
* Some arches dont care, unrolling the loop is a win on them.
* For other arches, we only have a 16bit alignement.
*/
-static unsigned long ifname_compare(const char *_a, const char *_b, const char *_mask)
+static unsigned long ifname_compare(const struct net_device *dev,
+ const char *_b, const char *_mask)
{
#ifdef CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS
- unsigned long ret = ifname_compare_aligned(_a, _b, _mask);
+ unsigned long ret = ifname_compare_all(dev, _b, _mask);
#else
unsigned long ret = 0;
- const u16 *a = (const u16 *)_a;
+ const u16 *a = (const u16 *)dev->name;
const u16 *b = (const u16 *)_b;
const u16 *mask = (const u16 *)_mask;
int i;
for (i = 0; i < IFNAMSIZ/sizeof(u16); i++)
ret |= (a[i] ^ b[i]) & mask[i];
+
+ if (likely(!(dev->ifalias && ret)))
+ goto out;
+
+ ret = 0;
+ a = (const u16 *)dev->ifalias;
+ for (i = 0; i < IFNAMSIZ/sizeof(u16); i++)
+ ret |= (a[i] ^ b[i]) & mask[i];
+
+out:
#endif
return ret;
}
@@ -101,8 +112,8 @@ static unsigned long ifname_compare(const char *_a, const char *_b, const char *
/* Returns whether packet matches rule or not. */
static inline int arp_packet_match(const struct arphdr *arphdr,
struct net_device *dev,
- const char *indev,
- const char *outdev,
+ const struct net_device *indev,
+ const struct net_device *outdev,
const struct arpt_arp *arpinfo)
{
const char *arpptr = (char *)(arphdr + 1);
@@ -252,11 +263,9 @@ unsigned int arpt_do_table(struct sk_buff *skb,
const struct net_device *out,
struct xt_table *table)
{
- static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
unsigned int verdict = NF_DROP;
const struct arphdr *arp;
struct arpt_entry *e, *back;
- const char *indev, *outdev;
void *table_base;
const struct xt_table_info *private;
struct xt_action_param acpar;
@@ -265,9 +274,6 @@ unsigned int arpt_do_table(struct sk_buff *skb,
if (!pskb_may_pull(skb, arp_hdr_len(skb->dev)))
return NF_DROP;
- indev = in ? in->name : nulldevname;
- outdev = out ? out->name : nulldevname;
-
local_bh_disable();
addend = xt_write_recseq_begin();
private = table->private;
@@ -291,7 +297,7 @@ unsigned int arpt_do_table(struct sk_buff *skb,
do {
const struct xt_entry_target *t;
- if (!arp_packet_match(arp, skb->dev, indev, outdev, &e->arp)) {
+ if (!arp_packet_match(arp, skb->dev, in, out, &e->arp)) {
e = arpt_next_entry(e);
continue;
}
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index 99e810f..87df9ef 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -73,8 +73,8 @@ EXPORT_SYMBOL_GPL(ipt_alloc_initial_table);
/* Performance critical - called for every packet */
static inline bool
ip_packet_match(const struct iphdr *ip,
- const char *indev,
- const char *outdev,
+ const struct net_device *indev,
+ const struct net_device *outdev,
const struct ipt_ip *ipinfo,
int isfrag)
{
@@ -97,7 +97,7 @@ ip_packet_match(const struct iphdr *ip,
return false;
}
- ret = ifname_compare_aligned(indev, ipinfo->iniface, ipinfo->iniface_mask);
+ ret = ifname_compare_all(indev, ipinfo->iniface, ipinfo->iniface_mask);
if (FWINV(ret != 0, IPT_INV_VIA_IN)) {
dprintf("VIA in mismatch (%s vs %s).%s\n",
@@ -106,7 +106,7 @@ ip_packet_match(const struct iphdr *ip,
return false;
}
- ret = ifname_compare_aligned(outdev, ipinfo->outiface, ipinfo->outiface_mask);
+ ret = ifname_compare_all(outdev, ipinfo->outiface, ipinfo->outiface_mask);
if (FWINV(ret != 0, IPT_INV_VIA_OUT)) {
dprintf("VIA out mismatch (%s vs %s).%s\n",
@@ -292,11 +292,9 @@ ipt_do_table(struct sk_buff *skb,
const struct net_device *out,
struct xt_table *table)
{
- static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
const struct iphdr *ip;
/* Initializing verdict to NF_DROP keeps gcc happy. */
unsigned int verdict = NF_DROP;
- const char *indev, *outdev;
const void *table_base;
struct ipt_entry *e, **jumpstack;
unsigned int *stackptr, origptr, cpu;
@@ -306,8 +304,6 @@ ipt_do_table(struct sk_buff *skb,
/* Initialization */
ip = ip_hdr(skb);
- indev = in ? in->name : nulldevname;
- outdev = out ? out->name : nulldevname;
/* We handle fragments by dealing with the first fragment as
* if it was a normal packet. All other fragments are treated
* normally, except that they will NEVER match rules that ask
@@ -348,8 +344,7 @@ ipt_do_table(struct sk_buff *skb,
const struct xt_entry_match *ematch;
IP_NF_ASSERT(e);
- if (!ip_packet_match(ip, indev, outdev,
- &e->ip, acpar.fragoff)) {
+ if (!ip_packet_match(ip, in, out, &e->ip, acpar.fragoff)) {
no_match:
e = ipt_next_entry(e);
continue;
diff --git a/net/ipv6/netfilter/ip6_tables.c b/net/ipv6/netfilter/ip6_tables.c
index e080fbb..9ed5d70 100644
--- a/net/ipv6/netfilter/ip6_tables.c
+++ b/net/ipv6/netfilter/ip6_tables.c
@@ -83,8 +83,8 @@ EXPORT_SYMBOL_GPL(ip6t_alloc_initial_table);
/* Performance critical - called for every packet */
static inline bool
ip6_packet_match(const struct sk_buff *skb,
- const char *indev,
- const char *outdev,
+ const struct net_device *indev,
+ const struct net_device *outdev,
const struct ip6t_ip6 *ip6info,
unsigned int *protoff,
int *fragoff, bool *hotdrop)
@@ -109,7 +109,7 @@ ip6_packet_match(const struct sk_buff *skb,
return false;
}
- ret = ifname_compare_aligned(indev, ip6info->iniface, ip6info->iniface_mask);
+ ret = ifname_compare_all(indev, ip6info->iniface, ip6info->iniface_mask);
if (FWINV(ret != 0, IP6T_INV_VIA_IN)) {
dprintf("VIA in mismatch (%s vs %s).%s\n",
@@ -118,7 +118,7 @@ ip6_packet_match(const struct sk_buff *skb,
return false;
}
- ret = ifname_compare_aligned(outdev, ip6info->outiface, ip6info->outiface_mask);
+ ret = ifname_compare_all(outdev, ip6info->outiface, ip6info->outiface_mask);
if (FWINV(ret != 0, IP6T_INV_VIA_OUT)) {
dprintf("VIA out mismatch (%s vs %s).%s\n",
@@ -318,10 +318,8 @@ ip6t_do_table(struct sk_buff *skb,
const struct net_device *out,
struct xt_table *table)
{
- static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
/* Initializing verdict to NF_DROP keeps gcc happy. */
unsigned int verdict = NF_DROP;
- const char *indev, *outdev;
const void *table_base;
struct ip6t_entry *e, **jumpstack;
unsigned int *stackptr, origptr, cpu;
@@ -329,10 +327,8 @@ ip6t_do_table(struct sk_buff *skb,
struct xt_action_param acpar;
unsigned int addend;
- /* Initialization */
- indev = in ? in->name : nulldevname;
- outdev = out ? out->name : nulldevname;
- /* We handle fragments by dealing with the first fragment as
+ /* Initialization:
+ * We handle fragments by dealing with the first fragment as
* if it was a normal packet. All other fragments are treated
* normally, except that they will NEVER match rules that ask
* things we don't know, ie. tcp syn flag or ports). If the
@@ -368,7 +364,7 @@ ip6t_do_table(struct sk_buff *skb,
IP_NF_ASSERT(e);
acpar.thoff = 0;
- if (!ip6_packet_match(skb, indev, outdev, &e->ipv6,
+ if (!ip6_packet_match(skb, in, out, &e->ipv6,
&acpar.thoff, &acpar.fragoff, &acpar.hotdrop)) {
no_match:
e = ip6t_next_entry(e);
diff --git a/net/netfilter/xt_physdev.c b/net/netfilter/xt_physdev.c
index f440f57..8d2ee7d 100644
--- a/net/netfilter/xt_physdev.c
+++ b/net/netfilter/xt_physdev.c
@@ -25,10 +25,8 @@ MODULE_ALIAS("ip6t_physdev");
static bool
physdev_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
- static const char nulldevname[IFNAMSIZ] __attribute__((aligned(sizeof(long))));
const struct xt_physdev_info *info = par->matchinfo;
unsigned long ret;
- const char *indev, *outdev;
const struct nf_bridge_info *nf_bridge;
/* Not a bridged IP packet or no info available yet:
@@ -68,8 +66,7 @@ physdev_mt(const struct sk_buff *skb, struct xt_action_param *par)
if (!(info->bitmask & XT_PHYSDEV_OP_IN))
goto match_outdev;
- indev = nf_bridge->physindev ? nf_bridge->physindev->name : nulldevname;
- ret = ifname_compare_aligned(indev, info->physindev, info->in_mask);
+ ret = ifname_compare_all(nf_bridge->physindev, info->physindev, info->in_mask);
if (!ret ^ !(info->invert & XT_PHYSDEV_OP_IN))
return false;
@@ -77,9 +74,7 @@ physdev_mt(const struct sk_buff *skb, struct xt_action_param *par)
match_outdev:
if (!(info->bitmask & XT_PHYSDEV_OP_OUT))
return true;
- outdev = nf_bridge->physoutdev ?
- nf_bridge->physoutdev->name : nulldevname;
- ret = ifname_compare_aligned(outdev, info->physoutdev, info->out_mask);
+ ret = ifname_compare_all(nf_bridge->physoutdev, info->physoutdev, info->out_mask);
return (!!ret ^ !(info->invert & XT_PHYSDEV_OP_OUT));
}
--
1.8.4.5
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