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sys/netinet/libalias/alias_db.c has internal static function UseLink() that passes a link to CleanupLink() to verify if the link has expired. If so, UseLink() may return NULL. _FindLinkIn()'s usage of UseLink() is not quite correct. Assume there is "redirect_port udp" configured to forward incoming traffic for specific port to some internal address. Such a rule creates partially specified permanent link. After first such incoming packet libalias creates new fully specified temporary LINK_UDP with default timeout of 60 seconds. Also, in case of low traffic libalias may assign "timestamp" for this new temporary link way in the past because LibAliasTime is updated seldom and can keep old value for tens of seconds, and it will be used for the temporary link. It may happen that next incoming packet for redirected port passed to _FindLinkIn() results in a call to UseLink() that returns NULL due to detected expiration. Immediate return of NULL results in broken translation: either a packet is dropped (deny_incoming mode) or delivered to original destination address instead of internal one. Fix it with additional check for NULL to proceed with a search for original partially specified link. In case of UDP, it also recreates temporary fully specified link with a call to ReLink(). Practical examples are "redirect_port udp" rules for unidirectional SYSLOG protocol (port 514) or some low volume VPN encapsulated in UDP. Thanks to Peter Much for initial analysis and first version of a patch. Reported by: Peter Much <pmc@citylink.dinoex.sub.org> PR: 269770 (cherry picked from commit |
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| bin | ||
| cddl | ||
| contrib | ||
| crypto | ||
| etc | ||
| gnu | ||
| include | ||
| kerberos5 | ||
| lib | ||
| libexec | ||
| release | ||
| rescue | ||
| sbin | ||
| secure | ||
| share | ||
| stand | ||
| sys | ||
| targets | ||
| tests | ||
| tools | ||
| usr.bin | ||
| usr.sbin | ||
| .arcconfig | ||
| .arclint | ||
| .cirrus.yml | ||
| .gitattributes | ||
| .gitignore | ||
| COPYRIGHT | ||
| LOCKS | ||
| MAINTAINERS | ||
| Makefile | ||
| Makefile.inc1 | ||
| Makefile.libcompat | ||
| Makefile.sys.inc | ||
| ObsoleteFiles.inc | ||
| README.md | ||
| UPDATING | ||
FreeBSD Source:
This is the top level of the FreeBSD source directory.
FreeBSD is an operating system used to power modern servers, desktops, and embedded platforms. A large community has continually developed it for more than thirty years. Its advanced networking, security, and storage features have made FreeBSD the platform of choice for many of the busiest web sites and most pervasive embedded networking and storage devices.
For copyright information, please see the file COPYRIGHT in this directory. Additional copyright information also exists for some sources in this tree - please see the specific source directories for more information.
The Makefile in this directory supports a number of targets for building components (or all) of the FreeBSD source tree. See build(7), config(8), FreeBSD handbook on building userland, and Handbook for kernels for more information, including setting make(1) variables.
Source Roadmap:
| Directory | Description |
|---|---|
| bin | System/user commands. |
| cddl | Various commands and libraries under the Common Development and Distribution License. |
| contrib | Packages contributed by 3rd parties. |
| crypto | Cryptography stuff (see crypto/README). |
| etc | Template files for /etc. |
| gnu | Commands and libraries under the GNU General Public License (GPL) or Lesser General Public License (LGPL). Please see gnu/COPYING and gnu/COPYING.LIB for more information. |
| include | System include files. |
| kerberos5 | Kerberos5 (Heimdal) package. |
| lib | System libraries. |
| libexec | System daemons. |
| release | Release building Makefile & associated tools. |
| rescue | Build system for statically linked /rescue utilities. |
| sbin | System commands. |
| secure | Cryptographic libraries and commands. |
| share | Shared resources. |
| stand | Boot loader sources. |
| sys | Kernel sources (see sys/README.md). |
| targets | Support for experimental DIRDEPS_BUILD |
| tests | Regression tests which can be run by Kyua. See tests/README for additional information. |
| tools | Utilities for regression testing and miscellaneous tasks. |
| usr.bin | User commands. |
| usr.sbin | System administration commands. |
For information on synchronizing your source tree with one or more of the FreeBSD Project's development branches, please see FreeBSD Handbook.