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authorHerbert Xu <herbert@gondor.apana.org.au>2007-11-13 21:34:06 -0800
committerDavid S. Miller <davem@davemloft.net>2008-01-28 14:53:37 -0800
commit352e512c32b634768303a43768245a0363cebbe7 (patch)
tree97509ac130ecbe2084808271ccc459918a9d5fc1 /net
parentb4ce92775c2e7ff9cf79cca4e0a19c8c5fd6287b (diff)
downloadop-kernel-dev-352e512c32b634768303a43768245a0363cebbe7.zip
op-kernel-dev-352e512c32b634768303a43768245a0363cebbe7.tar.gz
[NET]: Eliminate duplicate copies of dst_discard
We have a number of copies of dst_discard scattered around the place which all do the same thing, namely free a packet on the input or output paths. This patch deletes all of them except dst_discard and points all the users to it. The only non-trivial bit is decnet where it returns an error. However, conceptually this is identical to the blackhole functions used in IPv4 and IPv6 which do not return errors. So they should either all return errors or all return zero. For now I've stuck with the majority and picked zero as the return value. It doesn't really matter in practice since few if any driver would react differently depending on a zero return value or NET_RX_DROP. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/core/dst.c3
-rw-r--r--net/decnet/dn_route.c13
-rw-r--r--net/ipv4/route.c11
-rw-r--r--net/ipv6/exthdrs.c13
-rw-r--r--net/ipv6/route.c21
5 files changed, 12 insertions, 49 deletions
diff --git a/net/core/dst.c b/net/core/dst.c
index 03daead..f538061 100644
--- a/net/core/dst.c
+++ b/net/core/dst.c
@@ -153,11 +153,12 @@ loop:
#endif
}
-static int dst_discard(struct sk_buff *skb)
+int dst_discard(struct sk_buff *skb)
{
kfree_skb(skb);
return 0;
}
+EXPORT_SYMBOL(dst_discard);
void * dst_alloc(struct dst_ops * ops)
{
diff --git a/net/decnet/dn_route.c b/net/decnet/dn_route.c
index 23aa355..2a5bb07 100644
--- a/net/decnet/dn_route.c
+++ b/net/decnet/dn_route.c
@@ -765,17 +765,6 @@ drop:
}
/*
- * Drop packet. This is used for endnodes and for
- * when we should not be forwarding packets from
- * this dest.
- */
-static int dn_blackhole(struct sk_buff *skb)
-{
- kfree_skb(skb);
- return NET_RX_DROP;
-}
-
-/*
* Used to catch bugs. This should never normally get
* called.
*/
@@ -1396,7 +1385,7 @@ make_route:
default:
case RTN_UNREACHABLE:
case RTN_BLACKHOLE:
- rt->u.dst.input = dn_blackhole;
+ rt->u.dst.input = dst_discard;
}
rt->rt_flags = flags;
if (rt->u.dst.dev)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 49e0085..137b8eb 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -92,6 +92,7 @@
#include <linux/jhash.h>
#include <linux/rcupdate.h>
#include <linux/times.h>
+#include <net/dst.h>
#include <net/net_namespace.h>
#include <net/protocol.h>
#include <net/ip.h>
@@ -2357,12 +2358,6 @@ static struct dst_ops ipv4_dst_blackhole_ops = {
};
-static int ipv4_blackhole_output(struct sk_buff *skb)
-{
- kfree_skb(skb);
- return 0;
-}
-
static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp, struct sock *sk)
{
struct rtable *ort = *rp;
@@ -2374,8 +2369,8 @@ static int ipv4_dst_blackhole(struct rtable **rp, struct flowi *flp, struct sock
atomic_set(&new->__refcnt, 1);
new->__use = 1;
- new->input = ipv4_blackhole_output;
- new->output = ipv4_blackhole_output;
+ new->input = dst_discard;
+ new->output = dst_discard;
memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
new->dev = ort->u.dst.dev;
diff --git a/net/ipv6/exthdrs.c b/net/ipv6/exthdrs.c
index 1e89efd..cee06b1 100644
--- a/net/ipv6/exthdrs.c
+++ b/net/ipv6/exthdrs.c
@@ -32,6 +32,7 @@
#include <linux/in6.h>
#include <linux/icmpv6.h>
+#include <net/dst.h>
#include <net/sock.h>
#include <net/snmp.h>
@@ -318,18 +319,8 @@ void __init ipv6_destopt_init(void)
printk(KERN_ERR "ipv6_destopt_init: Could not register protocol\n");
}
-/********************************
- NONE header. No data in packet.
- ********************************/
-
-static int ipv6_nodata_rcv(struct sk_buff *skb)
-{
- kfree_skb(skb);
- return 0;
-}
-
static struct inet6_protocol nodata_protocol = {
- .handler = ipv6_nodata_rcv,
+ .handler = dst_discard,
.flags = INET6_PROTO_NOPOLICY,
};
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 20083e0..ac70e2d 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -152,7 +152,6 @@ struct rt6_info ip6_null_entry = {
static int ip6_pkt_prohibit(struct sk_buff *skb);
static int ip6_pkt_prohibit_out(struct sk_buff *skb);
-static int ip6_pkt_blk_hole(struct sk_buff *skb);
struct rt6_info ip6_prohibit_entry = {
.u = {
@@ -181,8 +180,8 @@ struct rt6_info ip6_blk_hole_entry = {
.obsolete = -1,
.error = -EINVAL,
.metrics = { [RTAX_HOPLIMIT - 1] = 255, },
- .input = ip6_pkt_blk_hole,
- .output = ip6_pkt_blk_hole,
+ .input = dst_discard,
+ .output = dst_discard,
.ops = &ip6_dst_ops,
.path = (struct dst_entry*)&ip6_blk_hole_entry,
}
@@ -782,12 +781,6 @@ struct dst_entry * ip6_route_output(struct sock *sk, struct flowi *fl)
EXPORT_SYMBOL(ip6_route_output);
-static int ip6_blackhole_output(struct sk_buff *skb)
-{
- kfree_skb(skb);
- return 0;
-}
-
int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl)
{
struct rt6_info *ort = (struct rt6_info *) *dstp;
@@ -800,8 +793,8 @@ int ip6_dst_blackhole(struct sock *sk, struct dst_entry **dstp, struct flowi *fl
atomic_set(&new->__refcnt, 1);
new->__use = 1;
- new->input = ip6_blackhole_output;
- new->output = ip6_blackhole_output;
+ new->input = dst_discard;
+ new->output = dst_discard;
memcpy(new->metrics, ort->u.dst.metrics, RTAX_MAX*sizeof(u32));
new->dev = ort->u.dst.dev;
@@ -1811,12 +1804,6 @@ static int ip6_pkt_prohibit_out(struct sk_buff *skb)
return ip6_pkt_drop(skb, ICMPV6_ADM_PROHIBITED, IPSTATS_MIB_OUTNOROUTES);
}
-static int ip6_pkt_blk_hole(struct sk_buff *skb)
-{
- kfree_skb(skb);
- return 0;
-}
-
#endif
/*
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