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Date: Sun, 14 Oct 2007 12:27:39 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Patrick McHardy <kaber@...sh.net>,
David Miller <davem@...emloft.net>, hadi@...erus.ca,
netdev@...r.kernel.org, kuznet@....inr.ac.ru,
Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 1/10] [SKBUFF]: Merge common code between copy_skb_header and skb_clone
[SKBUFF]: Merge common code between copy_skb_header and skb_clone
This patch creates a new function __copy_skb_header to merge the common
code between copy_skb_header and skb_clone. Having two functions which
are largely the same is a source of wasted labour as well as confusion.
In fact the tc_verd stuff is almost certainly a bug since it's treated
differently in skb_clone compared to the callers of copy_skb_header
(skb_copy/pskb_copy/skb_copy_expand).
I've kept that difference in tact with a comment added asking for
clarification.
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
---
net/core/skbuff.c | 116 ++++++++++++++++++++----------------------------------
1 files changed, 45 insertions(+), 71 deletions(-)
diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 944189d..758bbef 100644
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -362,6 +362,44 @@ void kfree_skb(struct sk_buff *skb)
__kfree_skb(skb);
}
+static void __copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
+{
+ new->tstamp = old->tstamp;
+ new->dev = old->dev;
+ new->transport_header = old->transport_header;
+ new->network_header = old->network_header;
+ new->mac_header = old->mac_header;
+ new->dst = dst_clone(old->dst);
+#ifdef CONFIG_INET
+ new->sp = secpath_get(old->sp);
+#endif
+ memcpy(new->cb, old->cb, sizeof(old->cb));
+ new->csum_start = old->csum_start;
+ new->csum_offset = old->csum_offset;
+ new->local_df = old->local_df;
+ new->pkt_type = old->pkt_type;
+ new->ip_summed = old->ip_summed;
+ skb_copy_queue_mapping(new, old);
+ new->priority = old->priority;
+#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
+ new->ipvs_property = old->ipvs_property;
+#endif
+ new->protocol = old->protocol;
+ new->mark = old->mark;
+ __nf_copy(new, old);
+#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
+ defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
+ new->nf_trace = old->nf_trace;
+#endif
+#ifdef CONFIG_NET_SCHED
+ new->tc_index = old->tc_index;
+#ifdef CONFIG_NET_CLS_ACT
+ new->tc_verd = old->tc_verd;
+#endif
+#endif
+ skb_copy_secmark(new, old);
+}
+
/**
* skb_clone - duplicate an sk_buff
* @skb: buffer to clone
@@ -397,51 +435,22 @@ struct sk_buff *skb_clone(struct sk_buff *skb, gfp_t gfp_mask)
n->next = n->prev = NULL;
n->sk = NULL;
- C(tstamp);
- C(dev);
- C(transport_header);
- C(network_header);
- C(mac_header);
- C(dst);
- dst_clone(skb->dst);
- C(sp);
-#ifdef CONFIG_INET
- secpath_get(skb->sp);
-#endif
- memcpy(n->cb, skb->cb, sizeof(skb->cb));
+ __copy_skb_header(n, skb);
+
C(len);
C(data_len);
C(mac_len);
- C(csum);
- C(local_df);
n->cloned = 1;
n->hdr_len = skb->nohdr ? skb_headroom(skb) : skb->hdr_len;
n->nohdr = 0;
- C(pkt_type);
- C(ip_summed);
- skb_copy_queue_mapping(n, skb);
- C(priority);
-#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
- C(ipvs_property);
-#endif
- C(protocol);
n->destructor = NULL;
- C(mark);
- __nf_copy(n, skb);
-#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
- defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
- C(nf_trace);
-#endif
-#ifdef CONFIG_NET_SCHED
- C(tc_index);
#ifdef CONFIG_NET_CLS_ACT
- n->tc_verd = SET_TC_VERD(skb->tc_verd,0);
+ /* FIXME What is this and why don't we do it in copy_skb_header? */
+ n->tc_verd = SET_TC_VERD(n->tc_verd,0);
n->tc_verd = CLR_TC_OK2MUNGE(n->tc_verd);
n->tc_verd = CLR_TC_MUNGED(n->tc_verd);
C(iif);
#endif
-#endif
- skb_copy_secmark(n, skb);
C(truesize);
atomic_set(&n->users, 1);
C(head);
@@ -463,50 +472,15 @@ static void copy_skb_header(struct sk_buff *new, const struct sk_buff *old)
*/
unsigned long offset = new->data - old->data;
#endif
- new->sk = NULL;
- new->dev = old->dev;
- skb_copy_queue_mapping(new, old);
- new->priority = old->priority;
- new->protocol = old->protocol;
- new->dst = dst_clone(old->dst);
-#ifdef CONFIG_INET
- new->sp = secpath_get(old->sp);
-#endif
- new->csum_start = old->csum_start;
- new->csum_offset = old->csum_offset;
- new->ip_summed = old->ip_summed;
- new->transport_header = old->transport_header;
- new->network_header = old->network_header;
- new->mac_header = old->mac_header;
+
+ __copy_skb_header(new, old);
+
#ifndef NET_SKBUFF_DATA_USES_OFFSET
/* {transport,network,mac}_header are relative to skb->head */
new->transport_header += offset;
new->network_header += offset;
new->mac_header += offset;
#endif
- memcpy(new->cb, old->cb, sizeof(old->cb));
- new->local_df = old->local_df;
- new->fclone = SKB_FCLONE_UNAVAILABLE;
- new->pkt_type = old->pkt_type;
- new->tstamp = old->tstamp;
- new->destructor = NULL;
- new->mark = old->mark;
- __nf_copy(new, old);
-#if defined(CONFIG_NETFILTER_XT_TARGET_TRACE) || \
- defined(CONFIG_NETFILTER_XT_TARGET_TRACE_MODULE)
- new->nf_trace = old->nf_trace;
-#endif
-#if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
- new->ipvs_property = old->ipvs_property;
-#endif
-#ifdef CONFIG_NET_SCHED
-#ifdef CONFIG_NET_CLS_ACT
- new->tc_verd = old->tc_verd;
-#endif
- new->tc_index = old->tc_index;
-#endif
- skb_copy_secmark(new, old);
- atomic_set(&new->users, 1);
skb_shinfo(new)->gso_size = skb_shinfo(old)->gso_size;
skb_shinfo(new)->gso_segs = skb_shinfo(old)->gso_segs;
skb_shinfo(new)->gso_type = skb_shinfo(old)->gso_type;
-
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