Date: Tue, 3 Jul 2001 20:57:50 +0400 From: Yar Tikhiy <yar@freebsd.org> To: audit@freebsd.org, net@freebsd.org Subject: ipfw ipprecedence option Message-ID: <20010703205750.A29370@comp.chem.msu.su>
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Hi there,
Current ipfw implementation doesn't allow for matching IP packets
by their precedence field while there exist real-life cases when
it would be a rather useful feature.
Please review the following patches against -current that add the
feature: ipfw.diff for the utility, ip_fw.diff for kernel.
As for me, they worked without any problems.
--
Yar
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diff -u --exclude=*orig /usr/src/sbin/ipfw/ipfw.8 ipfw/ipfw.8
--- /usr/src/sbin/ipfw/ipfw.8 Thu Jun 7 00:56:56 2001
+++ ipfw/ipfw.8 Sun Jul 1 15:03:47 2001
@@ -667,6 +667,9 @@
.It Cm ipversion Ar ver
Match if the IP header version is
.Ar ver .
+.It Cm ipprecedence Ar precedence
+Match if the numeric value of IP datagram's precedence is equal to
+.Ar precedence .
.It Cm iptos Ar spec
Match if the IP header contains the comma separated list of
service types specified in
diff -u --exclude=*orig /usr/src/sbin/ipfw/ipfw.c ipfw/ipfw.c
--- /usr/src/sbin/ipfw/ipfw.c Tue Jun 5 03:56:26 2001
+++ ipfw/ipfw.c Sun Jul 1 15:34:42 2001
@@ -432,6 +432,8 @@
printf(" iplen %u", chain->fw_iplen);
if (chain->fw_ipflg & IP_FW_IF_IPID)
printf(" ipid %#x", chain->fw_ipid);
+ if (chain->fw_ipflg & IP_FW_IF_IPPRE)
+ printf(" ipprecedence %u", (chain->fw_iptos & 0xe0) >> 5);
if (chain->fw_ipflg & IP_FW_IF_IPTOS) {
int _opt_printed = 0;
@@ -909,6 +911,7 @@
" ipoptions [!]{ssrr|lsrr|rr|ts}, ...\n"
" iplen {length}\n"
" ipid {identification number}\n"
+" ipprecedence {precedence}\n"
" iptos [!]{lowdelay|throughput|reliability|mincost|congestion}, ...\n"
" ipttl {time to live}\n"
" ipversion {version number}\n"
@@ -2058,6 +2061,24 @@
show_usage("argument to ipid out of range");
rule.fw_ipflg |= IP_FW_IF_IPID;
rule.fw_ipid = (u_short)ipid;
+ av++; ac--;
+ } else if (!strncmp(*av, "ipprecedence", strlen(*av))) {
+ u_long ippre;
+ char *c;
+
+ av++; ac--;
+ if (!ac)
+ show_usage("missing argument"
+ " for ``ipprecedence''");
+ ippre = strtoul(*av, &c, 0);
+ if (*c != '\0')
+ show_usage("argument to ipprecedence"
+ " must be numeric");
+ if (ippre > 7)
+ show_usage("argument to ipprecedence"
+ " out of range");
+ rule.fw_ipflg |= IP_FW_IF_IPPRE;
+ rule.fw_iptos |= ((u_short)ippre) << 5;
av++; ac--;
} else if (!strncmp(*av, "iptos", strlen(*av))) {
av++; ac--;
--lrZ03NoBR/3+SXJZ
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diff -u --exclude=*orig /usr/src/sys/netinet.orig/ip_fw.c netinet/ip_fw.c
--- /usr/src/sys/netinet.orig/ip_fw.c Fri Apr 6 10:52:25 2001
+++ netinet/ip_fw.c Sun Jul 1 15:40:52 2001
@@ -373,7 +373,7 @@
u_int flags = (ip->ip_tos & 0x1f);
u_char opts, nopts, nopts_sve;
- opts = f->fw_iptos;
+ opts = (f->fw_iptos & 0x1f);
nopts = nopts_sve = f->fw_ipntos;
while (flags != 0) {
@@ -1162,6 +1162,9 @@
if (f->fw_ipflg & IP_FW_IF_IPLEN && f->fw_iplen != ip_len)
continue;
if (f->fw_ipflg & IP_FW_IF_IPID && f->fw_ipid != ntohs(ip->ip_id))
+ continue;
+ if (f->fw_ipflg & IP_FW_IF_IPPRE &&
+ (f->fw_iptos & 0xe0) != (ip->ip_tos & 0xe0))
continue;
if (f->fw_ipflg & IP_FW_IF_IPTOS && !iptos_match(ip, f))
continue;
diff -u --exclude=*orig /usr/src/sys/netinet.orig/ip_fw.h netinet/ip_fw.h
--- /usr/src/sys/netinet.orig/ip_fw.h Tue Feb 13 17:12:04 2001
+++ netinet/ip_fw.h Sun Jul 1 15:27:24 2001
@@ -234,7 +234,8 @@
#define IP_FW_IF_IPTOS 0x00000800 /* ip type of service */
#define IP_FW_IF_IPTTL 0x00001000 /* ip time to live */
#define IP_FW_IF_IPVER 0x00002000 /* ip version */
-#define IP_FW_IF_IPMSK 0x00003f00 /* mask of all ip values */
+#define IP_FW_IF_IPPRE 0x00004000 /* ip precedence */
+#define IP_FW_IF_IPMSK 0x00007f00 /* mask of all ip values */
#define IP_FW_IF_MSK 0x0000ffff /* All possible bits mask */
--lrZ03NoBR/3+SXJZ--
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