Date: Wed, 16 Oct 2002 00:17:13 +0200 From: Poul-Henning Kamp <phk@freebsd.org> To: net@freebsd.org, arch@freebsd.org Subject: RFC: eliminating the _IP_VHL hack. Message-ID: <60637.1034720233@critter.freebsd.dk>
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almost 7 years ago, this commit introduced the _IP_VHL hack in our
IP-stack:
] revision 1.7
] date: 1995/12/21 21:20:27; author: wollman; state: Exp; lines: +5 -1
] If _IP_VHL is defined, declare a single ip_vhl member in struct ip rather
] than separate ip_v and ip_hl members. Should have no effect on current code,
] but I'd eventually like to get rid of those obnoxious bitfields completely.
We can argue a lot about how long time we should wait for "eventually",
but I would say that 7 years is far too long, considering the status:
In the meantime absolutely no code has picked up on this idea, and source
files using the _IP_VHL hack in in the minority in our tree.
The side effect of having some source-files using the _IP_VHL hack and
some not is that sizeof(struct ip) varies from file to file, which at
best is confusing an at worst the source of some really evil bugs.
I would therefore propose to eliminate the _IP_VHL hack from the kernel
to end this state of (potential) confusion, and invite comments to the
following patch:
Index: ip.h
===================================================================
RCS file: /home/ncvs/src/sys/netinet/ip.h,v
retrieving revision 1.19
diff -u -r1.19 ip.h
--- ip.h 14 Dec 2001 19:37:32 -0000 1.19
+++ ip.h 15 Oct 2002 22:02:26 -0000
@@ -47,9 +47,6 @@
* Structure of an internet header, naked of options.
*/
struct ip {
-#ifdef _IP_VHL
- u_char ip_vhl; /* version << 4 | header length >> 2 */
-#else
#if BYTE_ORDER == LITTLE_ENDIAN
u_int ip_hl:4, /* header length */
ip_v:4; /* version */
@@ -58,7 +55,6 @@
u_int ip_v:4, /* version */
ip_hl:4; /* header length */
#endif
-#endif /* not _IP_VHL */
u_char ip_tos; /* type of service */
u_short ip_len; /* total length */
u_short ip_id; /* identification */
@@ -72,13 +68,6 @@
u_short ip_sum; /* checksum */
struct in_addr ip_src,ip_dst; /* source and dest address */
};
-
-#ifdef _IP_VHL
-#define IP_MAKE_VHL(v, hl) ((v) << 4 | (hl))
-#define IP_VHL_HL(vhl) ((vhl) & 0x0f)
-#define IP_VHL_V(vhl) ((vhl) >> 4)
-#define IP_VHL_BORING 0x45
-#endif
#define IP_MAXPACKET 65535 /* maximum packet size */
Index: ip_icmp.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/ip_icmp.c,v
retrieving revision 1.70
diff -u -r1.70 ip_icmp.c
--- ip_icmp.c 1 Aug 2002 03:53:04 -0000 1.70
+++ ip_icmp.c 15 Oct 2002 22:05:23 -0000
@@ -51,7 +51,6 @@
#include <net/if_types.h>
#include <net/route.h>
-#define _IP_VHL
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
@@ -128,7 +127,7 @@
struct ifnet *destifp;
{
register struct ip *oip = mtod(n, struct ip *), *nip;
- register unsigned oiplen = IP_VHL_HL(oip->ip_vhl) << 2;
+ register unsigned oiplen = oip->ip_hl << 2;
register struct icmp *icp;
register struct mbuf *m;
unsigned icmplen;
@@ -214,7 +213,8 @@
nip = mtod(m, struct ip *);
bcopy((caddr_t)oip, (caddr_t)nip, sizeof(struct ip));
nip->ip_len = m->m_len;
- nip->ip_vhl = IP_VHL_BORING;
+ nip->ip_v = IPVERSION;
+ nip->ip_hl = 5;
nip->ip_p = IPPROTO_ICMP;
nip->ip_tos = 0;
icmp_reflect(m);
@@ -364,7 +364,7 @@
* Problem with datagram; advise higher level routines.
*/
if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) ||
- IP_VHL_HL(icp->icmp_ip.ip_vhl) < (sizeof(struct ip) >> 2)) {
+ icp->icmp_ip.ip_hl < (sizeof(struct ip) >> 2)) {
icmpstat.icps_badlen++;
goto freeit;
}
@@ -526,7 +526,7 @@
if (code > 3)
goto badcode;
if (icmplen < ICMP_ADVLENMIN || icmplen < ICMP_ADVLEN(icp) ||
- IP_VHL_HL(icp->icmp_ip.ip_vhl) < (sizeof(struct ip) >> 2)) {
+ icp->icmp_ip.ip_hl < (sizeof(struct ip) >> 2)) {
icmpstat.icps_badlen++;
break;
}
@@ -593,7 +593,7 @@
struct in_ifaddr *ia;
struct in_addr t;
struct mbuf *opts = 0;
- int optlen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof(struct ip);
+ int optlen = (ip->ip_hl << 2) - sizeof(struct ip);
struct route *ro = NULL, rt;
if (!in_canforward(ip->ip_src) &&
@@ -703,7 +703,8 @@
* mbuf's data back, and adjust the IP length.
*/
ip->ip_len -= optlen;
- ip->ip_vhl = IP_VHL_BORING;
+ ip->ip_v = IPVERSION;
+ ip->ip_hl = 5;
m->m_len -= optlen;
if (m->m_flags & M_PKTHDR)
m->m_pkthdr.len -= optlen;
@@ -734,7 +735,7 @@
register int hlen;
register struct icmp *icp;
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ hlen = ip->ip_hl << 2;
m->m_data += hlen;
m->m_len -= hlen;
icp = mtod(m, struct icmp *);
Index: ip_icmp.h
===================================================================
RCS file: /home/ncvs/src/sys/netinet/ip_icmp.h,v
retrieving revision 1.18
diff -u -r1.18 ip_icmp.h
--- ip_icmp.h 19 Mar 2002 21:25:46 -0000 1.18
+++ ip_icmp.h 15 Oct 2002 22:02:52 -0000
@@ -123,13 +123,8 @@
#define ICMP_TSLEN (8 + 3 * sizeof (n_time)) /* timestamp */
#define ICMP_MASKLEN 12 /* address mask */
#define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
-#ifndef _IP_VHL
#define ICMP_ADVLEN(p) (8 + ((p)->icmp_ip.ip_hl << 2) + 8)
/* N.B.: must separately check that ip_hl >= 5 */
-#else
-#define ICMP_ADVLEN(p) (8 + (IP_VHL_HL((p)->icmp_ip.ip_vhl) << 2) + 8)
- /* N.B.: must separately check that header length >= 5 */
-#endif
/*
* Definition of type and code field values.
Index: ip_input.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/ip_input.c,v
retrieving revision 1.211
diff -u -r1.211 ip_input.c
--- ip_input.c 10 Oct 2002 12:03:36 -0000 1.211
+++ ip_input.c 15 Oct 2002 22:02:57 -0000
@@ -34,8 +34,6 @@
* $FreeBSD: src/sys/netinet/ip_input.c,v 1.211 2002/10/10 12:03:36 maxim Exp $
*/
-#define _IP_VHL
-
#include "opt_bootp.h"
#include "opt_ipfw.h"
#include "opt_ipdn.h"
@@ -324,7 +322,7 @@
if (args.rule) { /* dummynet already filtered us */
ip = mtod(m, struct ip *);
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ hlen = ip->ip_hl << 2;
goto iphack ;
}
@@ -340,12 +338,12 @@
}
ip = mtod(m, struct ip *);
- if (IP_VHL_V(ip->ip_vhl) != IPVERSION) {
+ if (ip->ip_v != IPVERSION) {
ipstat.ips_badvers++;
goto bad;
}
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ hlen = ip->ip_hl << 2;
if (hlen < sizeof(struct ip)) { /* minimum header length */
ipstat.ips_badhlen++;
goto bad;
@@ -755,7 +753,7 @@
ipstat.ips_reassembled++;
ip = mtod(m, struct ip *);
/* Get the header length of the reassembled packet */
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ hlen = ip->ip_hl << 2;
#ifdef IPDIVERT
/* Restore original checksum before diverting packet */
if (divert_info != 0) {
@@ -882,7 +880,7 @@
struct ip *ip = mtod(m, struct ip *);
register struct mbuf *p, *q, *nq;
struct mbuf *t;
- int hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ int hlen = ip->ip_hl << 2;
int i, next;
/*
@@ -1020,7 +1018,7 @@
*/
q = fp->ipq_frags;
ip = GETIP(q);
- if (next + (IP_VHL_HL(ip->ip_vhl) << 2) > IP_MAXPACKET) {
+ if (next + (ip->ip_hl << 2) > IP_MAXPACKET) {
ipstat.ips_toolong++;
ip_freef(head, fp);
return (0);
@@ -1068,8 +1066,8 @@
nipq--;
(void) m_free(dtom(fp));
ip_nfragpackets--;
- m->m_len += (IP_VHL_HL(ip->ip_vhl) << 2);
- m->m_data -= (IP_VHL_HL(ip->ip_vhl) << 2);
+ m->m_len += (ip->ip_hl << 2);
+ m->m_data -= (ip->ip_hl << 2);
/* some debugging cruft by sklower, below, will go away soon */
if (m->m_flags & M_PKTHDR) /* XXX this should be done elsewhere */
m_fixhdr(m);
@@ -1193,7 +1191,7 @@
dst = ip->ip_dst;
cp = (u_char *)(ip + 1);
- cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip);
+ cnt = (ip->ip_hl << 2) - sizeof (struct ip);
for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[IPOPT_OPTVAL];
if (opt == IPOPT_EOL)
@@ -1582,14 +1580,15 @@
register caddr_t opts;
int olen;
- olen = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip);
+ olen = (ip->ip_hl << 2) - sizeof (struct ip);
opts = (caddr_t)(ip + 1);
i = m->m_len - (sizeof (struct ip) + olen);
bcopy(opts + olen, opts, (unsigned)i);
m->m_len -= olen;
if (m->m_flags & M_PKTHDR)
m->m_pkthdr.len -= olen;
- ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2);
+ ip->ip_v = IPVERSION;
+ ip->ip_hl = sizeof(struct ip) >> 2;
}
u_char inetctlerrmap[PRC_NCMDS] = {
@@ -1686,7 +1685,7 @@
MGET(mcopy, M_DONTWAIT, m->m_type);
if (mcopy != NULL) {
M_COPY_PKTHDR(mcopy, m);
- mcopy->m_len = imin((IP_VHL_HL(ip->ip_vhl) << 2) + 8,
+ mcopy->m_len = imin((ip->ip_hl << 2) + 8,
(int)ip->ip_len);
m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
#ifdef MAC
Index: ip_output.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/ip_output.c,v
retrieving revision 1.165
diff -u -r1.165 ip_output.c
--- ip_output.c 23 Sep 2002 08:56:24 -0000 1.165
+++ ip_output.c 15 Oct 2002 22:03:41 -0000
@@ -34,8 +34,6 @@
* $FreeBSD: src/sys/netinet/ip_output.c,v 1.165 2002/09/23 08:56:24 maxim Exp $
*/
-#define _IP_VHL
-
#include "opt_ipfw.h"
#include "opt_ipdn.h"
#include "opt_ipdivert.h"
@@ -191,7 +189,7 @@
#endif
if (args.rule != NULL) { /* dummynet already saw us */
ip = mtod(m, struct ip *);
- hlen = IP_VHL_HL(ip->ip_vhl) << 2 ;
+ hlen = ip->ip_hl << 2 ;
if (ro->ro_rt)
ia = ifatoia(ro->ro_rt->rt_ifa);
goto sendit;
@@ -210,7 +208,8 @@
* Fill in IP header.
*/
if ((flags & (IP_FORWARDING|IP_RAWOUTPUT)) == 0) {
- ip->ip_vhl = IP_MAKE_VHL(IPVERSION, hlen >> 2);
+ ip->ip_v = IPVERSION;
+ ip->ip_hl = hlen >> 2;
ip->ip_off &= IP_DF;
#ifdef RANDOM_IP_ID
ip->ip_id = ip_randomid();
@@ -219,7 +218,7 @@
#endif
ipstat.ips_localout++;
} else {
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
+ hlen = ip->ip_hl << 2;
}
dst = (struct sockaddr_in *)&ro->ro_dst;
@@ -553,11 +552,7 @@
/* be sure to update variables that are affected by ipsec4_output() */
ip = mtod(m, struct ip *);
-#ifdef _IP_VHL
- hlen = IP_VHL_HL(ip->ip_vhl) << 2;
-#else
hlen = ip->ip_hl << 2;
-#endif
if (ro->ro_rt == NULL) {
if ((flags & IP_ROUTETOIF) == 0) {
printf("ip_output: "
@@ -862,13 +857,8 @@
ip->ip_len = htons(ip->ip_len);
ip->ip_off = htons(ip->ip_off);
ip->ip_sum = 0;
- if (sw_csum & CSUM_DELAY_IP) {
- if (ip->ip_vhl == IP_VHL_BORING) {
- ip->ip_sum = in_cksum_hdr(ip);
- } else {
- ip->ip_sum = in_cksum(m, hlen);
- }
- }
+ if (sw_csum & CSUM_DELAY_IP)
+ ip->ip_sum = in_cksum(m, hlen);
/* Record statistics for this interface address. */
if (!(flags & IP_FORWARDING) && ia) {
@@ -988,7 +978,8 @@
*mhip = *ip;
if (hlen > sizeof (struct ip)) {
mhlen = ip_optcopy(ip, mhip) + sizeof (struct ip);
- mhip->ip_vhl = IP_MAKE_VHL(IPVERSION, mhlen >> 2);
+ mhip->ip_v = IPVERSION;
+ mhip->ip_hl = mhlen >> 2;
}
m->m_len = mhlen;
mhip->ip_off = ((off - hlen) >> 3) + ip->ip_off;
@@ -1012,13 +1003,8 @@
m->m_pkthdr.csum_flags = m0->m_pkthdr.csum_flags;
mhip->ip_off = htons(mhip->ip_off);
mhip->ip_sum = 0;
- if (sw_csum & CSUM_DELAY_IP) {
- if (mhip->ip_vhl == IP_VHL_BORING) {
- mhip->ip_sum = in_cksum_hdr(mhip);
- } else {
- mhip->ip_sum = in_cksum(m, mhlen);
- }
- }
+ if (sw_csum & CSUM_DELAY_IP)
+ mhip->ip_sum = in_cksum(m, mhlen);
*mnext = m;
mnext = &m->m_nextpkt;
nfrags++;
@@ -1041,13 +1027,8 @@
ip->ip_off |= IP_MF;
ip->ip_off = htons(ip->ip_off);
ip->ip_sum = 0;
- if (sw_csum & CSUM_DELAY_IP) {
- if (ip->ip_vhl == IP_VHL_BORING) {
- ip->ip_sum = in_cksum_hdr(ip);
- } else {
- ip->ip_sum = in_cksum(m, hlen);
- }
- }
+ if (sw_csum & CSUM_DELAY_IP)
+ ip->ip_sum = in_cksum(m, hlen);
sendorfree:
for (m = m0; m; m = m0) {
m0 = m->m_nextpkt;
@@ -1097,7 +1078,7 @@
u_short csum, offset;
ip = mtod(m, struct ip *);
- offset = IP_VHL_HL(ip->ip_vhl) << 2 ;
+ offset = ip->ip_hl << 2 ;
csum = in_cksum_skip(m, ip->ip_len, offset);
if (m->m_pkthdr.csum_flags & CSUM_UDP && csum == 0)
csum = 0xffff;
@@ -1169,7 +1150,8 @@
ip = mtod(m, struct ip *);
bcopy(p->ipopt_list, ip + 1, optlen);
*phlen = sizeof(struct ip) + optlen;
- ip->ip_vhl = IP_MAKE_VHL(IPVERSION, *phlen >> 2);
+ ip->ip_v = IPVERSION;
+ ip->ip_hl = *phlen >> 2;
ip->ip_len += optlen;
return (m);
}
@@ -1187,7 +1169,7 @@
cp = (u_char *)(ip + 1);
dp = (u_char *)(jp + 1);
- cnt = (IP_VHL_HL(ip->ip_vhl) << 2) - sizeof (struct ip);
+ cnt = (ip->ip_hl << 2) - sizeof (struct ip);
for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[0];
if (opt == IPOPT_EOL)
@@ -2025,11 +2007,7 @@
ip->ip_len = htons(ip->ip_len);
ip->ip_off = htons(ip->ip_off);
ip->ip_sum = 0;
- if (ip->ip_vhl == IP_VHL_BORING) {
- ip->ip_sum = in_cksum_hdr(ip);
- } else {
- ip->ip_sum = in_cksum(copym, hlen);
- }
+ ip->ip_sum = in_cksum(copym, hlen);
/*
* NB:
* It's not clear whether there are any lingering
Index: raw_ip.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/raw_ip.c,v
retrieving revision 1.100
diff -u -r1.100 raw_ip.c
--- raw_ip.c 15 Aug 2002 18:51:26 -0000 1.100
+++ raw_ip.c 15 Oct 2002 22:06:09 -0000
@@ -59,7 +59,6 @@
#include <net/if.h>
#include <net/route.h>
-#define _IP_VHL
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_pcb.h>
@@ -263,10 +262,10 @@
ip = mtod(m, struct ip *);
/* don't allow both user specified and setsockopt options,
and don't allow packet length sizes that will crash */
- if (((IP_VHL_HL(ip->ip_vhl) != (sizeof (*ip) >> 2))
+ if (((ip->ip_hl != (sizeof (*ip) >> 2))
&& inp->inp_options)
|| (ip->ip_len > m->m_pkthdr.len)
- || (ip->ip_len < (IP_VHL_HL(ip->ip_vhl) << 2))) {
+ || (ip->ip_len < (ip->ip_hl << 2))) {
m_freem(m);
return EINVAL;
}
Index: tcp_subr.c
===================================================================
RCS file: /home/ncvs/src/sys/netinet/tcp_subr.c,v
retrieving revision 1.143
diff -u -r1.143 tcp_subr.c
--- tcp_subr.c 10 Oct 2002 21:41:30 -0000 1.143
+++ tcp_subr.c 15 Oct 2002 22:06:27 -0000
@@ -62,7 +62,6 @@
#include <net/route.h>
#include <net/if.h>
-#define _IP_VHL
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
@@ -284,7 +283,8 @@
{
struct ip *ip = (struct ip *) ip_ptr;
- ip->ip_vhl = IP_VHL_BORING;
+ ip->ip_v = IPVERSION;
+ ip->ip_hl = 5;
ip->ip_tos = 0;
ip->ip_len = 0;
ip->ip_id = 0;
@@ -371,7 +371,7 @@
KASSERT(tp != NULL || m != NULL, ("tcp_respond: tp and m both NULL"));
#ifdef INET6
- isipv6 = IP_VHL_V(((struct ip *)ipgen)->ip_vhl) == 6;
+ isipv6 = ((struct ip *)ipgen)->ip_v == 6;
ip6 = ipgen;
#endif /* INET6 */
ip = ipgen;
@@ -1102,7 +1102,7 @@
if (ip) {
s = splnet();
th = (struct tcphdr *)((caddr_t)ip
- + (IP_VHL_HL(ip->ip_vhl) << 2));
+ + (ip->ip_hl << 2));
INP_INFO_WLOCK(&tcbinfo);
inp = in_pcblookup_hash(&tcbinfo, faddr, th->th_dport,
ip->ip_src, th->th_sport, 0, NULL);
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.
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