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Some optimisations to the fragment reassembly code.

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Submitted by: Don Lewis <Don.Lewis@tsc.tdk.com>
This commit is contained in:
Doug Rabson 1998-10-27 09:19:03 +00:00
parent afb3fdba7c
commit e3f0338ead
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=40670
1 changed files with 14 additions and 19 deletions
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33
sys/netinet/ip_input.c
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@ -31,7 +31,7 @@
* SUCH DAMAGE.
*
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94
* $Id: ip_input.c,v 1.102 1998/10/16 03:55:01 peter Exp $
* $Id: ip_input.c,v 1.103 1998/10/27 09:11:41 dfr Exp $
* $ANA: ip_input.c,v 1.5 1996/09/18 14:34:59 wollman Exp $
*/
@ -711,13 +711,13 @@ ip_reass(m, fp, where)
fp->ipq_id = ip->ip_id;
fp->ipq_src = ip->ip_src;
fp->ipq_dst = ip->ip_dst;
fp->ipq_frags = 0;
fp->ipq_frags = m;
m->m_nextpkt = NULL;
#ifdef IPDIVERT
fp->ipq_divert = 0;
fp->ipq_div_cookie = 0;
#endif
q = 0;
goto insert;
goto inserted;
}
#define GETIP(m) ((struct ip*)((m)->m_pkthdr.header))
@ -732,7 +732,8 @@ ip_reass(m, fp, where)
/*
* If there is a preceding segment, it may provide some of
* our data already. If so, drop the data from the incoming
* segment. If it provides all of our data, drop us.
* segment. If it provides all of our data, drop us, otherwise
* stick new segment in the proper place.
*/
if (p) {
i = GETIP(p)->ip_off + GETIP(p)->ip_len - ip->ip_off;
@ -743,6 +744,11 @@ ip_reass(m, fp, where)
ip->ip_off += i;
ip->ip_len -= i;
}
m->m_nextpkt = p->m_nextpkt;
p->m_nextpkt = m;
} else {
m->m_nextpkt = fp->ipq_frags;
fp->ipq_frags = m;
}
/*
@ -760,14 +766,11 @@ ip_reass(m, fp, where)
break;
}
nq = q->m_nextpkt;
if (p)
p->m_nextpkt = nq;
else
fp->ipq_frags = nq;
m->m_nextpkt = nq;
m_freem(q);
}
insert:
inserted:
#ifdef IPDIVERT
/*
@ -782,16 +785,8 @@ insert:
#endif
/*
* Stick new segment in its place;
* check for complete reassembly.
* Check for complete reassembly.
*/
if (p == NULL) {
m->m_nextpkt = fp->ipq_frags;
fp->ipq_frags = m;
} else {
m->m_nextpkt = p->m_nextpkt;
p->m_nextpkt = m;
}
next = 0;
for (p = NULL, q = fp->ipq_frags; q; p = q, q = q->m_nextpkt) {
if (GETIP(q)->ip_off != next)