Drop a couple of ifdef/endif pairs by moving the ifdef
surrounding neigh_app_ns() to the interior of neigh_app_ns().
Cc: "David S. Miller" <[email protected]>
Cc: Alexey Kuznetsov <[email protected]>
Cc: James Morris <[email protected]>
Cc: Hideaki YOSHIFUJI <[email protected]>
Cc: Patrick McHardy <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Gao feng <[email protected]>
Cc: Joe Perches <[email protected]>
Signed-off-by: Tim Gardner <[email protected]>
---
This is an admittedly trivial change. I stumbled on it while trying to figure
out why Ubuntu doesn't have CONFIG_ARPD enabled.
net/core/neighbour.c | 4 ++--
net/ipv4/arp.c | 2 --
net/ipv6/ndisc.c | 2 --
3 files changed, 2 insertions(+), 6 deletions(-)
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 60533db..049dd9e 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2759,13 +2759,13 @@ errout:
rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}
-#ifdef CONFIG_ARPD
void neigh_app_ns(struct neighbour *n)
{
+#ifdef CONFIG_ARPD
__neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
+#endif /* CONFIG_ARPD */
}
EXPORT_SYMBOL(neigh_app_ns);
-#endif /* CONFIG_ARPD */
#ifdef CONFIG_SYSCTL
static int zero;
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 4429b01..7808093 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -368,9 +368,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
} else {
probes -= neigh->parms->app_probes;
if (probes < 0) {
-#ifdef CONFIG_ARPD
neigh_app_ns(neigh);
-#endif
return;
}
}
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 04d31c2..d5693ad 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -663,9 +663,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
}
ndisc_send_ns(dev, neigh, target, target, saddr);
} else if ((probes -= neigh->parms->app_probes) < 0) {
-#ifdef CONFIG_ARPD
neigh_app_ns(neigh);
-#endif
} else {
addrconf_addr_solict_mult(target, &mcaddr);
ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
--
1.7.9.5
On Wed, 2013-08-28 at 12:24 -0600, Tim Gardner wrote:
> Drop a couple of ifdef/endif pairs by moving the ifdef
> surrounding neigh_app_ns() to the interior of neigh_app_ns().
[]
> This is an admittedly trivial change. I stumbled on it while trying to figure
> out why Ubuntu doesn't have CONFIG_ARPD enabled.
I'd be more inclined to make neigh_app_ns static inline
in the .h file and remove the EXPORT_SYMBOL
> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
> index 60533db..049dd9e 100644
> --- a/net/core/neighbour.c
> +++ b/net/core/neighbour.c
> @@ -2759,13 +2759,13 @@ errout:
> rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
> }
>
> -#ifdef CONFIG_ARPD
> void neigh_app_ns(struct neighbour *n)
> {
> +#ifdef CONFIG_ARPD
> __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
> +#endif /* CONFIG_ARPD */
> }
> EXPORT_SYMBOL(neigh_app_ns);
> -#endif /* CONFIG_ARPD */
>
> #ifdef CONFIG_SYSCTL
> static int zero;
> diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
> index 4429b01..7808093 100644
> --- a/net/ipv4/arp.c
> +++ b/net/ipv4/arp.c
> @@ -368,9 +368,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
> } else {
> probes -= neigh->parms->app_probes;
> if (probes < 0) {
> -#ifdef CONFIG_ARPD
> neigh_app_ns(neigh);
> -#endif
> return;
> }
> }
> diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
> index 04d31c2..d5693ad 100644
> --- a/net/ipv6/ndisc.c
> +++ b/net/ipv6/ndisc.c
> @@ -663,9 +663,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
> }
> ndisc_send_ns(dev, neigh, target, target, saddr);
> } else if ((probes -= neigh->parms->app_probes) < 0) {
> -#ifdef CONFIG_ARPD
> neigh_app_ns(neigh);
> -#endif
> } else {
> addrconf_addr_solict_mult(target, &mcaddr);
> ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
On 08/28/2013 12:51 PM, Joe Perches wrote:
> On Wed, 2013-08-28 at 12:24 -0600, Tim Gardner wrote:
>> Drop a couple of ifdef/endif pairs by moving the ifdef
>> surrounding neigh_app_ns() to the interior of neigh_app_ns().
> []
>> This is an admittedly trivial change. I stumbled on it while trying to figure
>> out why Ubuntu doesn't have CONFIG_ARPD enabled.
>
> I'd be more inclined to make neigh_app_ns static inline
> in the .h file and remove the EXPORT_SYMBOL
>
I thought about that as well, but then you'd have to extern
__neigh_notify(), which is currently a static function and large enough
to not really be suitable for inlining. Seems like unnecessary churn to me.
rtg
--
Tim Gardner [email protected]
Tim Gardner <[email protected]> writes:
> Drop a couple of ifdef/endif pairs by moving the ifdef
> surrounding neigh_app_ns() to the interior of neigh_app_ns().
Can we please just remove the CONFIG_ARPD option entirely.
There really is no savings to keeping this option configurable and the
option only removes a netlink notification.
> Cc: "David S. Miller" <[email protected]>
> Cc: Alexey Kuznetsov <[email protected]>
> Cc: James Morris <[email protected]>
> Cc: Hideaki YOSHIFUJI <[email protected]>
> Cc: Patrick McHardy <[email protected]>
> Cc: "Eric W. Biederman" <[email protected]>
> Cc: Gao feng <[email protected]>
> Cc: Joe Perches <[email protected]>
> Signed-off-by: Tim Gardner <[email protected]>
> ---
>
> This is an admittedly trivial change. I stumbled on it while trying to figure
> out why Ubuntu doesn't have CONFIG_ARPD enabled.
>
> net/core/neighbour.c | 4 ++--
> net/ipv4/arp.c | 2 --
> net/ipv6/ndisc.c | 2 --
> 3 files changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
> index 60533db..049dd9e 100644
> --- a/net/core/neighbour.c
> +++ b/net/core/neighbour.c
> @@ -2759,13 +2759,13 @@ errout:
> rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
> }
>
> -#ifdef CONFIG_ARPD
> void neigh_app_ns(struct neighbour *n)
> {
> +#ifdef CONFIG_ARPD
> __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
> +#endif /* CONFIG_ARPD */
> }
> EXPORT_SYMBOL(neigh_app_ns);
> -#endif /* CONFIG_ARPD */
>
> #ifdef CONFIG_SYSCTL
> static int zero;
> diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
> index 4429b01..7808093 100644
> --- a/net/ipv4/arp.c
> +++ b/net/ipv4/arp.c
> @@ -368,9 +368,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
> } else {
> probes -= neigh->parms->app_probes;
> if (probes < 0) {
> -#ifdef CONFIG_ARPD
> neigh_app_ns(neigh);
> -#endif
> return;
> }
> }
> diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
> index 04d31c2..d5693ad 100644
> --- a/net/ipv6/ndisc.c
> +++ b/net/ipv6/ndisc.c
> @@ -663,9 +663,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
> }
> ndisc_send_ns(dev, neigh, target, target, saddr);
> } else if ((probes -= neigh->parms->app_probes) < 0) {
> -#ifdef CONFIG_ARPD
> neigh_app_ns(neigh);
> -#endif
> } else {
> addrconf_addr_solict_mult(target, &mcaddr);
> ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
On Wed, 2013-08-28 at 13:09 -0600, Tim Gardner wrote:
> On 08/28/2013 12:51 PM, Joe Perches wrote:
> > On Wed, 2013-08-28 at 12:24 -0600, Tim Gardner wrote:
> >> Drop a couple of ifdef/endif pairs by moving the ifdef
> >> surrounding neigh_app_ns() to the interior of neigh_app_ns().
> > []
> >> This is an admittedly trivial change. I stumbled on it while trying to figure
> >> out why Ubuntu doesn't have CONFIG_ARPD enabled.
> > I'd be more inclined to make neigh_app_ns static inline
> > in the .h file and remove the EXPORT_SYMBOL
> I thought about that as well, but then you'd have to extern
> __neigh_notify(), which is currently a static function and large enough
> to not really be suitable for inlining. Seems like unnecessary churn to me.
Hi Tim.
As is, this makes the call to neight_app_ns
impossible to optimize away.
Perhaps this:
(this does add a possibly unused neigh_notify as a global symbol)
Rename __neigh_notify to neigh_notify and make public
Add static inline neigh_app_ns
Remove #ifdefs around use of neigh_app_ns
---
Compile tested only
include/net/neighbour.h | 10 +++++++++-
net/core/neighbour.c | 15 +++------------
net/ipv4/arp.c | 2 --
net/ipv6/ndisc.c | 2 --
4 files changed, 12 insertions(+), 17 deletions(-)
diff --git a/include/net/neighbour.h b/include/net/neighbour.h
index 536501a..a08b0a7 100644
--- a/include/net/neighbour.h
+++ b/include/net/neighbour.h
@@ -249,7 +249,15 @@ static inline struct net *pneigh_net(const struct pneigh_entry *pneigh)
return read_pnet(&pneigh->net);
}
-void neigh_app_ns(struct neighbour *n);
+void neigh_notify(struct neighbour *n, int type, int flags);
+
+static inline void neigh_app_ns(struct neighbour *n)
+{
+#ifdef CONFIG_ARPD
+ neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
+#endif
+}
+
void neigh_for_each(struct neigh_table *tbl,
void (*cb)(struct neighbour *, void *), void *cookie);
void __neigh_for_each_release(struct neigh_table *tbl,
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 60533db..6ec5f86 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -50,7 +50,6 @@ do { \
#define PNEIGH_HASHMASK 0xF
static void neigh_timer_handler(unsigned long arg);
-static void __neigh_notify(struct neighbour *n, int type, int flags);
static void neigh_update_notify(struct neighbour *neigh);
static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
@@ -103,7 +102,7 @@ static void neigh_cleanup_and_release(struct neighbour *neigh)
if (neigh->parms->neigh_cleanup)
neigh->parms->neigh_cleanup(neigh);
- __neigh_notify(neigh, RTM_DELNEIGH, 0);
+ neigh_notify(neigh, RTM_DELNEIGH, 0);
neigh_release(neigh);
}
@@ -2215,7 +2214,7 @@ nla_put_failure:
static void neigh_update_notify(struct neighbour *neigh)
{
call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
- __neigh_notify(neigh, RTM_NEWNEIGH, 0);
+ neigh_notify(neigh, RTM_NEWNEIGH, 0);
}
static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
@@ -2735,7 +2734,7 @@ static inline size_t neigh_nlmsg_size(void)
+ nla_total_size(4); /* NDA_PROBES */
}
-static void __neigh_notify(struct neighbour *n, int type, int flags)
+void neigh_notify(struct neighbour *n, int type, int flags)
{
struct net *net = dev_net(n->dev);
struct sk_buff *skb;
@@ -2759,14 +2758,6 @@ errout:
rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}
-#ifdef CONFIG_ARPD
-void neigh_app_ns(struct neighbour *n)
-{
- __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
-}
-EXPORT_SYMBOL(neigh_app_ns);
-#endif /* CONFIG_ARPD */
-
#ifdef CONFIG_SYSCTL
static int zero;
static int int_max = INT_MAX;
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 4429b01..7808093 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -368,9 +368,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
} else {
probes -= neigh->parms->app_probes;
if (probes < 0) {
-#ifdef CONFIG_ARPD
neigh_app_ns(neigh);
-#endif
return;
}
}
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 04d31c2..d5693ad 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -663,9 +663,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
}
ndisc_send_ns(dev, neigh, target, target, saddr);
} else if ((probes -= neigh->parms->app_probes) < 0) {
-#ifdef CONFIG_ARPD
neigh_app_ns(neigh);
-#endif
} else {
addrconf_addr_solict_mult(target, &mcaddr);
ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
Joe Perches <[email protected]> writes:
> On Wed, 2013-08-28 at 13:09 -0600, Tim Gardner wrote:
>> On 08/28/2013 12:51 PM, Joe Perches wrote:
>> > On Wed, 2013-08-28 at 12:24 -0600, Tim Gardner wrote:
>> >> Drop a couple of ifdef/endif pairs by moving the ifdef
>> >> surrounding neigh_app_ns() to the interior of neigh_app_ns().
>> > []
>> >> This is an admittedly trivial change. I stumbled on it while trying to figure
>> >> out why Ubuntu doesn't have CONFIG_ARPD enabled.
>
>> > I'd be more inclined to make neigh_app_ns static inline
>> > in the .h file and remove the EXPORT_SYMBOL
>
>> I thought about that as well, but then you'd have to extern
>> __neigh_notify(), which is currently a static function and large enough
>> to not really be suitable for inlining. Seems like unnecessary churn to me.
>
> Hi Tim.
>
> As is, this makes the call to neight_app_ns
> impossible to optimize away.
>
> Perhaps this:
>
> (this does add a possibly unused neigh_notify as a global symbol)
>
> Rename __neigh_notify to neigh_notify and make public
> Add static inline neigh_app_ns
> Remove #ifdefs around use of neigh_app_ns
Again. Why not just remove CONFIG_ARPD entirely? A config option to
compile out a single line of code seems like a real waste.
Eric
> ---
>
> Compile tested only
>
> include/net/neighbour.h | 10 +++++++++-
> net/core/neighbour.c | 15 +++------------
> net/ipv4/arp.c | 2 --
> net/ipv6/ndisc.c | 2 --
> 4 files changed, 12 insertions(+), 17 deletions(-)
>
> diff --git a/include/net/neighbour.h b/include/net/neighbour.h
> index 536501a..a08b0a7 100644
> --- a/include/net/neighbour.h
> +++ b/include/net/neighbour.h
> @@ -249,7 +249,15 @@ static inline struct net *pneigh_net(const struct pneigh_entry *pneigh)
> return read_pnet(&pneigh->net);
> }
>
> -void neigh_app_ns(struct neighbour *n);
> +void neigh_notify(struct neighbour *n, int type, int flags);
> +
> +static inline void neigh_app_ns(struct neighbour *n)
> +{
> +#ifdef CONFIG_ARPD
> + neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
> +#endif
> +}
> +
> void neigh_for_each(struct neigh_table *tbl,
> void (*cb)(struct neighbour *, void *), void *cookie);
> void __neigh_for_each_release(struct neigh_table *tbl,
> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
> index 60533db..6ec5f86 100644
> --- a/net/core/neighbour.c
> +++ b/net/core/neighbour.c
> @@ -50,7 +50,6 @@ do { \
> #define PNEIGH_HASHMASK 0xF
>
> static void neigh_timer_handler(unsigned long arg);
> -static void __neigh_notify(struct neighbour *n, int type, int flags);
> static void neigh_update_notify(struct neighbour *neigh);
> static int pneigh_ifdown(struct neigh_table *tbl, struct net_device *dev);
>
> @@ -103,7 +102,7 @@ static void neigh_cleanup_and_release(struct neighbour *neigh)
> if (neigh->parms->neigh_cleanup)
> neigh->parms->neigh_cleanup(neigh);
>
> - __neigh_notify(neigh, RTM_DELNEIGH, 0);
> + neigh_notify(neigh, RTM_DELNEIGH, 0);
> neigh_release(neigh);
> }
>
> @@ -2215,7 +2214,7 @@ nla_put_failure:
> static void neigh_update_notify(struct neighbour *neigh)
> {
> call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, neigh);
> - __neigh_notify(neigh, RTM_NEWNEIGH, 0);
> + neigh_notify(neigh, RTM_NEWNEIGH, 0);
> }
>
> static int neigh_dump_table(struct neigh_table *tbl, struct sk_buff *skb,
> @@ -2735,7 +2734,7 @@ static inline size_t neigh_nlmsg_size(void)
> + nla_total_size(4); /* NDA_PROBES */
> }
>
> -static void __neigh_notify(struct neighbour *n, int type, int flags)
> +void neigh_notify(struct neighbour *n, int type, int flags)
> {
> struct net *net = dev_net(n->dev);
> struct sk_buff *skb;
> @@ -2759,14 +2758,6 @@ errout:
> rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
> }
>
> -#ifdef CONFIG_ARPD
> -void neigh_app_ns(struct neighbour *n)
> -{
> - __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
> -}
> -EXPORT_SYMBOL(neigh_app_ns);
> -#endif /* CONFIG_ARPD */
> -
> #ifdef CONFIG_SYSCTL
> static int zero;
> static int int_max = INT_MAX;
> diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
> index 4429b01..7808093 100644
> --- a/net/ipv4/arp.c
> +++ b/net/ipv4/arp.c
> @@ -368,9 +368,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
> } else {
> probes -= neigh->parms->app_probes;
> if (probes < 0) {
> -#ifdef CONFIG_ARPD
> neigh_app_ns(neigh);
> -#endif
> return;
> }
> }
> diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
> index 04d31c2..d5693ad 100644
> --- a/net/ipv6/ndisc.c
> +++ b/net/ipv6/ndisc.c
> @@ -663,9 +663,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
> }
> ndisc_send_ns(dev, neigh, target, target, saddr);
> } else if ((probes -= neigh->parms->app_probes) < 0) {
> -#ifdef CONFIG_ARPD
> neigh_app_ns(neigh);
> -#endif
> } else {
> addrconf_addr_solict_mult(target, &mcaddr);
> ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
This config option is superfluous in that it only guards a call
to neigh_app_ns(). Enabling CONFIG_ARPD by default has no
change in behavior. There will now be call to __neigh_notify()
for each ARP resolution, which has no impact unless there is a
user space daemon waiting to receive the notification, i.e.,
the case for which CONFIG_ARPD was designed anyways.
Suggested-by: Eric W. Biederman <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Alexey Kuznetsov <[email protected]>
Cc: James Morris <[email protected]>
Cc: Hideaki YOSHIFUJI <[email protected]>
Cc: Patrick McHardy <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Cc: Gao feng <[email protected]>
Cc: Joe Perches <[email protected]>
Cc: Veaceslav Falico <[email protected]>
Signed-off-by: Tim Gardner <[email protected]>
---
Eric's suggestion to simply remove the config option makes sense
to me. If acceptable then I'll submit a patch series that also removes
CONFIG_ARPD from the various arch defconfigs.
net/core/neighbour.c | 2 --
net/ipv4/Kconfig | 16 ----------------
net/ipv4/arp.c | 2 --
net/ipv6/ndisc.c | 2 --
4 files changed, 22 deletions(-)
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index 60533db..6072610 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -2759,13 +2759,11 @@ errout:
rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
}
-#ifdef CONFIG_ARPD
void neigh_app_ns(struct neighbour *n)
{
__neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
}
EXPORT_SYMBOL(neigh_app_ns);
-#endif /* CONFIG_ARPD */
#ifdef CONFIG_SYSCTL
static int zero;
diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
index 37cf1a6..05c57f0 100644
--- a/net/ipv4/Kconfig
+++ b/net/ipv4/Kconfig
@@ -259,22 +259,6 @@ config IP_PIMSM_V2
gated-5). This routing protocol is not used widely, so say N unless
you want to play with it.
-config ARPD
- bool "IP: ARP daemon support"
- ---help---
- The kernel maintains an internal cache which maps IP addresses to
- hardware addresses on the local network, so that Ethernet
- frames are sent to the proper address on the physical networking
- layer. Normally, kernel uses the ARP protocol to resolve these
- mappings.
-
- Saying Y here adds support to have an user space daemon to do this
- resolution instead. This is useful for implementing an alternate
- address resolution protocol (e.g. NHRP on mGRE tunnels) and also for
- testing purposes.
-
- If unsure, say N.
-
config SYN_COOKIES
bool "IP: TCP syncookie support"
---help---
diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
index 4429b01..7808093 100644
--- a/net/ipv4/arp.c
+++ b/net/ipv4/arp.c
@@ -368,9 +368,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
} else {
probes -= neigh->parms->app_probes;
if (probes < 0) {
-#ifdef CONFIG_ARPD
neigh_app_ns(neigh);
-#endif
return;
}
}
diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
index 04d31c2..d5693ad 100644
--- a/net/ipv6/ndisc.c
+++ b/net/ipv6/ndisc.c
@@ -663,9 +663,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
}
ndisc_send_ns(dev, neigh, target, target, saddr);
} else if ((probes -= neigh->parms->app_probes) < 0) {
-#ifdef CONFIG_ARPD
neigh_app_ns(neigh);
-#endif
} else {
addrconf_addr_solict_mult(target, &mcaddr);
ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
--
1.7.9.5
Tim Gardner <[email protected]> writes:
> This config option is superfluous in that it only guards a call
> to neigh_app_ns(). Enabling CONFIG_ARPD by default has no
> change in behavior. There will now be call to __neigh_notify()
> for each ARP resolution, which has no impact unless there is a
> user space daemon waiting to receive the notification, i.e.,
> the case for which CONFIG_ARPD was designed anyways.
This looks good to me, and much less magic to maintain.
Eric
> Suggested-by: Eric W. Biederman <[email protected]>
Reviewed-by: "Eric W. Biederman" <[email protected]>
> Cc: "David S. Miller" <[email protected]>
> Cc: Alexey Kuznetsov <[email protected]>
> Cc: James Morris <[email protected]>
> Cc: Hideaki YOSHIFUJI <[email protected]>
> Cc: Patrick McHardy <[email protected]>
> Cc: "Eric W. Biederman" <[email protected]>
> Cc: Gao feng <[email protected]>
> Cc: Joe Perches <[email protected]>
> Cc: Veaceslav Falico <[email protected]>
> Signed-off-by: Tim Gardner <[email protected]>
> ---
>
> Eric's suggestion to simply remove the config option makes sense
> to me. If acceptable then I'll submit a patch series that also removes
> CONFIG_ARPD from the various arch defconfigs.
>
> net/core/neighbour.c | 2 --
> net/ipv4/Kconfig | 16 ----------------
> net/ipv4/arp.c | 2 --
> net/ipv6/ndisc.c | 2 --
> 4 files changed, 22 deletions(-)
>
> diff --git a/net/core/neighbour.c b/net/core/neighbour.c
> index 60533db..6072610 100644
> --- a/net/core/neighbour.c
> +++ b/net/core/neighbour.c
> @@ -2759,13 +2759,11 @@ errout:
> rtnl_set_sk_err(net, RTNLGRP_NEIGH, err);
> }
>
> -#ifdef CONFIG_ARPD
> void neigh_app_ns(struct neighbour *n)
> {
> __neigh_notify(n, RTM_GETNEIGH, NLM_F_REQUEST);
> }
> EXPORT_SYMBOL(neigh_app_ns);
> -#endif /* CONFIG_ARPD */
>
> #ifdef CONFIG_SYSCTL
> static int zero;
> diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
> index 37cf1a6..05c57f0 100644
> --- a/net/ipv4/Kconfig
> +++ b/net/ipv4/Kconfig
> @@ -259,22 +259,6 @@ config IP_PIMSM_V2
> gated-5). This routing protocol is not used widely, so say N unless
> you want to play with it.
>
> -config ARPD
> - bool "IP: ARP daemon support"
> - ---help---
> - The kernel maintains an internal cache which maps IP addresses to
> - hardware addresses on the local network, so that Ethernet
> - frames are sent to the proper address on the physical networking
> - layer. Normally, kernel uses the ARP protocol to resolve these
> - mappings.
> -
> - Saying Y here adds support to have an user space daemon to do this
> - resolution instead. This is useful for implementing an alternate
> - address resolution protocol (e.g. NHRP on mGRE tunnels) and also for
> - testing purposes.
> -
> - If unsure, say N.
> -
> config SYN_COOKIES
> bool "IP: TCP syncookie support"
> ---help---
> diff --git a/net/ipv4/arp.c b/net/ipv4/arp.c
> index 4429b01..7808093 100644
> --- a/net/ipv4/arp.c
> +++ b/net/ipv4/arp.c
> @@ -368,9 +368,7 @@ static void arp_solicit(struct neighbour *neigh, struct sk_buff *skb)
> } else {
> probes -= neigh->parms->app_probes;
> if (probes < 0) {
> -#ifdef CONFIG_ARPD
> neigh_app_ns(neigh);
> -#endif
> return;
> }
> }
> diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c
> index 04d31c2..d5693ad 100644
> --- a/net/ipv6/ndisc.c
> +++ b/net/ipv6/ndisc.c
> @@ -663,9 +663,7 @@ static void ndisc_solicit(struct neighbour *neigh, struct sk_buff *skb)
> }
> ndisc_send_ns(dev, neigh, target, target, saddr);
> } else if ((probes -= neigh->parms->app_probes) < 0) {
> -#ifdef CONFIG_ARPD
> neigh_app_ns(neigh);
> -#endif
> } else {
> addrconf_addr_solict_mult(target, &mcaddr);
> ndisc_send_ns(dev, NULL, target, &mcaddr, saddr);
From: Tim Gardner <[email protected]>
Date: Thu, 29 Aug 2013 06:38:47 -0600
> This config option is superfluous in that it only guards a call
> to neigh_app_ns(). Enabling CONFIG_ARPD by default has no
> change in behavior. There will now be call to __neigh_notify()
> for each ARP resolution, which has no impact unless there is a
> user space daemon waiting to receive the notification, i.e.,
> the case for which CONFIG_ARPD was designed anyways.
>
> Suggested-by: Eric W. Biederman <[email protected]>
...
> Signed-off-by: Tim Gardner <[email protected]>
Applied, thanks.