From 352e512c32b634768303a43768245a0363cebbe7 Mon Sep 17 00:00:00 2001 From: Herbert Xu Date: Tue, 13 Nov 2007 21:34:06 -0800 Subject: [PATCH] [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 Signed-off-by: David S. Miller --- include/net/dst.h | 1 + net/core/dst.c | 3 ++- net/decnet/dn_route.c | 13 +------------ net/ipv4/route.c | 11 +++-------- net/ipv6/exthdrs.c | 13 ++----------- net/ipv6/route.c | 21 ++++----------------- 6 files changed, 13 insertions(+), 49 deletions(-) diff --git a/include/net/dst.h b/include/net/dst.h index 69888f1502..7a0b1bde8e 100644 --- a/include/net/dst.h +++ b/include/net/dst.h @@ -179,6 +179,7 @@ static inline struct dst_entry *dst_pop(struct dst_entry *dst) return child; } +extern int dst_discard(struct sk_buff *skb); extern void * dst_alloc(struct dst_ops * ops); extern void __dst_free(struct dst_entry * dst); extern struct dst_entry *dst_destroy(struct dst_entry * dst); diff --git a/net/core/dst.c b/net/core/dst.c index 03daead359..f538061f4b 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 23aa3556e5..2a5bb0714c 100644 --- a/net/decnet/dn_route.c +++ b/net/decnet/dn_route.c @@ -764,17 +764,6 @@ drop: return NET_RX_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 49e008568d..137b8eb666 100644 --- a/net/ipv4/route.c +++ b/net/ipv4/route.c @@ -92,6 +92,7 @@ #include #include #include +#include #include #include #include @@ -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 1e89efd38a..cee06b1655 100644 --- a/net/ipv6/exthdrs.c +++ b/net/ipv6/exthdrs.c @@ -32,6 +32,7 @@ #include #include +#include #include #include @@ -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 20083e0d39..ac70e2d3b1 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 /* -- 2.39.5