hak5
/
openwrt-owl
mirror of https://github.com/hak5/openwrt-owl.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

map: fix psidlen becoming negative (FS#1430) 

Fix psidlen becomes negative in case embedded address bit lenght is smaller than
IPv4 suffix length.
While at it improve parameter checking making the code more logical and
easier to read.

Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>
openwrt-18.06
Hans Dedecker 2018-03-29 16:25:14 +02:00
parent d9da0387f4
commit 479aaf6375
2 changed files with 18 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
package/network/ipv6/map/Makefile
View File

@ -9,7 +9,7 @@ include $(TOPDIR)/rules.mk
PKG_NAME:=map
PKG_VERSION:=4
PKG_RELEASE:=9
PKG_RELEASE:=10
PKG_LICENSE:=GPL-2.0
include $(INCLUDE_DIR)/package.mk

28
package/network/ipv6/map/src/mapcalc.c
View File

@ -4,6 +4,7 @@
* Author: Steven Barth <cyrus@openwrt.org>
* Copyright (c) 2014-2015 cisco Systems, Inc.
* Copyright (c) 2015 Steven Barth <cyrus@openwrt.org>
* Copyright (c) 2018 Hans Dedecker <dedeckeh@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
@ -311,25 +312,30 @@ int main(int argc, char *argv[])
if (psidlen <= 0) {
psidlen = ealen - (32 - prefix4len);
if (psidlen < 0)
psidlen = 0;
psid = -1;
}
if (psid < 0 && psidlen <= 16 && psidlen >= 0 && pdlen >= 0 && ealen >= psidlen) {
bmemcpys64(&psid16, &pd, prefix6len + ealen - psidlen, psidlen);
psid = be16_to_cpu(psid16);
}
psid = psid >> (16 - psidlen);
psid16 = cpu_to_be16(psid);
psid = psid << (16 - psidlen);
if (prefix4len < 0 || prefix6len < 0 || ealen < 0 || ealen < psidlen) {
if (prefix4len < 0 || prefix6len < 0 || ealen < 0 || psidlen > 16 || ealen < psidlen) {
fprintf(stderr, "Skipping invalid or incomplete rule: %s\n", argv[i]);
status = 1;
continue;
}
if ((pdlen >= 0 || ealen == psidlen) && ealen >= psidlen) {
if (psid < 0 && psidlen >= 0 && pdlen >= 0) {
bmemcpys64(&psid16, &pd, prefix6len + ealen - psidlen, psidlen);
psid = be16_to_cpu(psid16);
}
if (psidlen > 0) {
psid = psid >> (16 - psidlen);
psid16 = cpu_to_be16(psid);
psid = psid << (16 - psidlen);
}
if (pdlen >= 0 || ealen == psidlen) {
bmemcpys64(&ipv4addr, &pd, prefix6len, ealen - psidlen);
ipv4addr.s_addr = htonl(ntohl(ipv4addr.s_addr) >> prefix4len);
bmemcpy(&ipv4addr, &ipv4prefix, prefix4len);