shorewall6-lite (8) - Linux Manuals

OPTIONS

The trace and debug options are used for debugging. See m[blue]http://www.shorewall.net/starting_and_stopping_shorewall.htm#Tracem[].

The nolock option prevents the command from attempting to acquire the shorewall6-lite lockfile. It is useful if you need to include shorewall commands in the startedm[blue]extension scriptm[][1].

The options control the amount of output that the command produces. They consist of a sequence of the letters v and q. If the options are omitted, the amount of output is determined by the setting of the VERBOSITY parameter in m[blue]shorewall6.confm[][2](5). Each v adds one to the effective verbosity and each q subtracts one from the effective VERBOSITY. Alternately, v may be followed immediately with one of -1,0,1,2 to specify VERBOSITY. There may be no white-space between v and the VERBOSITY.

The options may also include the letter t which causes all progress messages to be timestamped.

COMMANDS

The available commands are listed below.

add { interface[:host-list]... zone | zone host-list }

Adds a list of hosts or subnets to a dynamic zone usually used with VPN's.

The interface argument names an interface defined in the m[blue]shorewall-interfacesm[][3](5) file. A host-list is comma-separated list whose elements are host or network addresses.

Caution
The add command is not very robust. If there are errors in the host-list, you may see a large number of error messages yet a subsequent shorewall6-lite show zones command will indicate that all hosts were added. If this happens, replace add by delete and run the same command again. Then enter the correct command.

allow address

Re-enables receipt of packets from hosts previously blacklisted by a drop, logdrop, reject, or logreject command. Beginning with Shorewall 5.0.10, this command can also re-enable addresses blacklisted using the blacklist command.

blacklist address [ option ... ]

Added in Shorewall 5.0.8 and requires DYNAMIC_BLACKLIST=ipset.. in m[blue]shorewall6.confm[][4](5). Causes packets from the given host or network address to be dropped, based on the setting of BLACKLIST in m[blue]shorewall6.confm[][4](5). The address along with any options are passed to the ipset add command.

If the disconnect option is specified in the DYNAMIC_BLACKLISTING setting, then the effective VERBOSITY determines the amount of information displayed:

• If the effective verbosity is > 0, then a message giving the number of conntrack flows deleted by the command is displayed.

• If the effective verbosity is > 1, then the conntrack table entries deleted by the command are also displayed.

call function [ parameter ... ]

Added in Shorewall 4.6.10. Allows you to call a function in one of the Shorewall libraries or in your compiled script. function must name the shell function to be called. The listed parameters are passed to the function.

The function is first searched for in lib.base, lib.common and lib.cli. If it is not found, the call command is passed to the generated script to be executed.

clear [-f]

Clear will remove all rules and chains installed by shorewall6-lite. The firewall is then wide open and unprotected. Existing connections are untouched. Clear is often used to see if the firewall is causing connection problems.

If -f is given, the command will be processed by the compiled script that executed the last successful start, reload, restart or refresh command if that script exists.

close { open-number | source dest [ protocol [ port ] ] }

Added in Shorewall 4.5.8. This command closes a temporary open created by the open command. In the first form, an open-number specifies the open to be closed. Open numbers are displayed in the num column of the output of the shorewall6-lite show opens command.

When the second form of the command is used, the parameters must match those given in the earlier open command.

delete { interface[:host-list]... zone | zone host-list }

The delete command reverses the effect of an earlier add command.

The interface argument names an interface defined in the m[blue]shorewall-interfacesm[][3](5) file. A host-list is comma-separated list whose elements are a host or network address.

disable { interface | provider }

Added in Shorewall 4.4.26. Disables the optional provider associated with the specified interface or provider. Where more than one provider share a single network interface, a provider name must be given.

drop address

Causes traffic from the listed addresses to be silently dropped.

dump [-x] [-l] [-m] [-c]

Produces a verbose report about the firewall configuration for the purpose of problem analysis.

The -x option causes actual packet and byte counts to be displayed. Without that option, these counts are abbreviated.

The -m option causes any MAC addresses included in shorewall6-lite log messages to be displayed.

The -l option causes the rule number for each Netfilter rule to be displayed.

The -c option causes the route cache to be dumped in addition to the other routing information.

enable { interface | provider }

Added in Shorewall 4.4.26. Enables the optional provider associated with the specified interface or provider. Where more than one provider share a single network interface, a provider name must be given.

forget [ filename ]

Deletes /var/lib/shorewall6-lite/filename and /var/lib/shorewall6-lite/save. If no filename is given then the file specified by RESTOREFILE in m[blue]shorewall6.confm[][2](5) is assumed.

help

Displays a syntax summary.

hits

Generates several reports from shorewall6-lite log messages in the current log file. If the -t option is included, the reports are restricted to log messages generated today.

iptrace ip6tables match expression

This is a low-level debugging command that causes iptables TRACE log records to be created. See iptables(8) for details.

The iptables match expression must be one or more matches that may appear in both the raw table OUTPUT and raw table PREROUTING chains.

The trace records are written to the kernel's log buffer with facility = kernel and priority = warning, and they are routed from there by your logging daemon (syslogd, rsyslog, syslog-ng, ...) -- shorewall6-lite has no control over where the messages go; consult your logging daemon's documentation.

list

list is a synonym for show -- please see below.

logdrop address

Causes traffic from the listed addresses to be logged then discarded. Logging occurs at the log level specified by the BLACKLIST_LOGLEVEL setting in m[blue]shorewall6.confm[][2] (5).

logwatch [-m] [refresh-interval]

Monitors the log file specified by the LOGFILE option in m[blue]shorewall6.confm[][2](5) and produces an audible alarm when new shorewall6-lite messages are logged.

The -m option causes the MAC address of each packet source to be displayed if that information is available.

The refresh-interval specifies the time in seconds between screen refreshes. You can enter a negative number by preceding the number with "--" (e.g., shorewall6-lite logwatch -- -30). In this case, when a packet count changes, you will be prompted to hit any key to resume screen refreshes.

logreject address

Causes traffic from the listed addresses to be logged then rejected. Logging occurs at the log level specified by the BLACKLIST_LOGLEVEL setting in m[blue]shorewall6.confm[][2] (5).

ls

ls is a synonym for show -- please see below.

noiptrace ip6tables match expression

This is a low-level debugging command that cancels a trace started by a preceding iptrace command.

The ip6tables match expression must be one given in the iptrace command being canceled.

open source dest [ protocol [ port ] ]

Added in Shorewall 4.6.8. This command requires that the firewall be in the started state and that DYNAMIC_BLACKLIST=Yes in m[blue]shorewall6.conf (5)m[][4]. The effect of the command is to temporarily open the firewall for connections matching the parameters.

The source and dest parameters may each be specified as all if you don't wish to restrict the connection source or destination respectively. Otherwise, each must contain a host or network address or a valid DNS name.

The protocol may be specified either as a number or as a name listed in /etc/protocols. The port may be specified numerically or as a name listed in /etc/services.

To reverse the effect of a successful open command, use the close command with the same parameters or simply restart the firewall.

Example: To open the firewall for SSH connections to address 2001:470:b:227::1, the command would be:

    shorewall6-lite open all 2001:470:b:227::1 tcp 22

To reverse that command, use:

    shorewall6-lite close all 2001:470:b:227::1 tcp 22

reenable{ interface | provider }

Added in Shorewall 4.6.9. This is equivalent to a disable command followed by an enable command on the specified interface or provider.

reject address

Causes traffic from the listed addresses to be silently rejected.

reload [-n] [-p] [-C]

Added in Shorewall 5.0.0, reload is similar to shorewall6-lite start except that it assumes that the firewall is already started. Existing connections are maintained.

The -n option causes shorewall6-lite to avoid updating the routing table(s).

The -p option causes the connection tracking table to be flushed; the conntrack utility must be installed to use this option.

The -C option was added in Shorewall 4.6.5. If the specified (or implicit) firewall script is the one that generated the current running configuration, then the running netfilter configuration will be reloaded as is so as to preserve the iptables packet and byte counters.

reset [chain, ...]

Resets the packet and byte counters in the specified chain(s). If no chain is specified, all the packet and byte counters in the firewall are reset.

restart [-n] [-p] [-C]

Beginning with Shorewall 5.0.0, this command performs a true restart. The firewall is completely stopped as if a stop command had been issued then it is started again.

The -n option causes shorewall6-lite to avoid updating the routing table(s).

The -p option causes the connection tracking table to be flushed; the conntrack utility must be installed to use this option.

The -C option was added in Shorewall 4.6.5. If the specified (or implicit) firewall script is the one that generated the current running configuration, then the running netfilter configuration will be reloaded as is so as to preserve the iptables packet and byte counters.

restore [-n] [-p] [-C] [ filename ]

Restore shorewall6-lite to a state saved using the shorewall6-lite save command. Existing connections are maintained. The filename names a restore file in /var/lib/shorewall6-lite created using shorewall6-lite save; if no filename is given then shorewall6-lite will be restored from the file specified by the RESTOREFILE option in m[blue]shorewall6.confm[][2](5).

Caution
If your ip6tables ruleset depends on variables that are detected at run-time, either in your params file or by Shorewall-generated code, restore will use the values that were current when the ruleset was saved, which may be different from the current values.

The -C option was added in Shorewall 4.6.5. If the -C option was specified during shorewall7-lite save, then the counters saved by that operation will be restored.

run command [ parameter ... ]

Added in Shorewall 4.6.3. Executes command in the context of the generated script passing the supplied parameters. Normally, the command will be a function declared in lib.private.

Before executing the command, the script will detect the configuration, setting all SW_* variables and will run your init extension script with $COMMAND = 'run'.

save [-C] [ filename ]

The dynamic blacklist is stored in /var/lib/shorewall6-lite/save. The state of the firewall is stored in /var/lib/shorewall6-lite/filename for use by the shorewall6-lite restore command. If filename is not given then the state is saved in the file specified by the RESTOREFILE option in m[blue]shorewall6.confm[][2](5).

The -C option, added in Shorewall 4.6.5, causes the ip6tables packet and byte counters to be saved along with the chains and rules.

savesets

Added in shorewall 4.6.8. Performs the same action as the stop command with respect to saving ipsets (see the SAVE_IPSETS option in m[blue]shorewall6.confm[][4] (5)). This command may be used to proactively save your ipset contents in the event that a system failure occurs prior to issuing a stop command.

show

The show command can have a number of different arguments:

[-x] bl|blacklists

Added in Shorewall 4.6.2. Displays the dynamic chain along with any chains produced by entries in shorewall6-blrules(5).The -x option is passed directly through to ip6tables and causes actual packet and byte counts to be displayed. Without this option, those counts are abbreviated.

[-f] capabilities

Displays your kernel/iptables capabilities. The -f option causes the display to be formatted as a capabilities file for use with compile -e.

[-b] [-x] [-l] [-t {filter|mangle|nat|raw|rawpost}][ chain... ]

The rules in each chain are displayed using the iptables -Lchain-n -v command. If no chain is given, all of the chains in the filter table are displayed.

The -x option is passed directly through to iptables and causes actual packet and byte counts to be displayed. Without this option, those counts are abbreviated.

The -t option specifies the Netfilter table to display. The default is filter.

The -b ('brief') option causes rules which have not been used (i.e. which have zero packet and byte counts) to be omitted from the output. Chains with no rules displayed are also omitted from the output.

The -l option causes the rule number for each Netfilter rule to be displayed.

If the -t option and the chain keyword are both omitted and any of the listed chains do not exist, a usage message is displayed.

classifiers|filters

Displays information about the packet classifiers defined on the system as a result of traffic shaping configuration.

config

Displays distribution-specific defaults.

connections [filter_parameter ...]

Displays the IP connections currently being tracked by the firewall.

If the conntrack utility is installed, beginning with Shorewall 4.6.11 the set of connections displayed can be limited by including conntrack filter parameters (-p , -s, --dport, etc). See conntrack(8) for details.

event event

Added in Shorewall 4.5.19. Displays the named event.

events

Added in Shorewall 4.5.19. Displays all events.

ip

Displays the system's IPv4 configuration.

ipa

Added in Shorewall 4.4.17. Displays the per-IP accounting counters (m[blue]shorewall-accountingm[][5] (5)).

[-m] log

Displays the last 20 shorewall6-lite messages from the log file specified by the LOGFILE option in m[blue]shorewall6.confm[][2](5).

The -m option causes the MAC address of each packet source to be displayed if that information is available.

[-x] mangle

Displays the Netfilter mangle table using the command ip6tables -t mangle -L -n -v.The -x option is passed directly through to ip6tables and causes actual packet and byte counts to be displayed. Without this option, those counts are abbreviated.

marks

Added in Shorewall 4.4.26. Displays the various fields in packet marks giving the min and max value (in both decimal and hex) and the applicable mask (in hex).

opens

Added in Shorewall 4.5.8. Displays the iptables rules in the 'dynamic' chain created through use of the open command..

[-x] nat

Displays the Netfilter nat table using the command ip6tables -t nat -L -n -v.The -x option is passed directly through to iptables and causes actual packet and byte counts to be displayed. Without this option, those counts are abbreviated.

policies

Added in Shorewall 4.4.4. Displays the applicable policy between each pair of zones. Note that implicit intrazone ACCEPT policies are not displayed for zones associated with a single network where that network doesn't specify routeback.

[-x] raw

Displays the Netfilter raw table using the command iptables -t raw -L -n -v.The -x option is passed directly through to iptables and causes actual packet and byte counts to be displayed. Without this option, those counts are abbreviated.

[-c]routing

Displays the system's IPv4 routing configuration. The -c option causes the route cache to be displayed in addition to the other routing information.

tc

Displays information about queuing disciplines, classes and filters.

zones

Displays the current composition of the Shorewall zones on the system.

start [-p] [-n] [-f] [-C]

Start Shorewall6 Lite. Existing connections through shorewall6-lite managed interfaces are untouched. New connections will be allowed only if they are allowed by the firewall rules or policies.

The -p option causes the connection tracking table to be flushed; the conntrack utility must be installed to use this option.

The -n option prevents the firewall script from modifying the current routing configuration.

The -f option was added in Shorewall 4.6.5. If the RESTOREFILE named in m[blue]shorewall.confm[][2](5) exists, is executable and is not older than the current filewall script, then that saved configuration is restored.

The -C option was added in Shorewall 4.6.5 and is only meaningful when the -f option is also specified. If the previously-saved configuration is restored, and if the -C option was also specified in the save command, then the packet and byte counters will be restored.

stop [-f]

Stops the firewall. All existing connections, except those listed in m[blue]shorewall-routestoppedm[][6](5) or permitted by the ADMINISABSENTMINDED option in m[blue]shorewall6.confm[][2](5), are taken down. The only new traffic permitted through the firewall is from systems listed in m[blue]shorewall-routestoppedm[][6](5) or by ADMINISABSENTMINDED.

If -f is given, the command will be processed by the compiled script that executed the last successful start, restart or refresh command if that script exists.

status

Produces a short report about the state of the Shorewall-configured firewall.

The -i option was added in Shorewall 4.6.2 and causes the status of each optional or provider interface to be displayed.

version [-a]

Displays Shorewall's version. The -a option is included for compatibility with earlier Shorewall releases and is ignored.

EXIT STATUS

In general, when a command succeeds, status 0 is returned; when the command fails, a non-zero status is returned.

The status command returns exit status as follows:

0 - Firewall is started.

3 - Firewall is stopped or cleared

4 - Unknown state; usually means that the firewall has never been started.

ENVIRONMENT

Two environmental variables are recognized by Shorewall6-lite:

SHOREWALL_INIT_SCRIPT

When set to 1, causes Std out to be redirected to the file specified in the STARTUP_LOG option in m[blue]shorewall6.conf(5)m[][7].

SW_LOGGERTAG

Added in Shorewall 5.0.8. When set to a non-empty value, that value is passed to the logger utility in its -t (--tag) option.

NOTES

1.

extension script

http://www.shorewall.net../shorewall_extension_scripts.html

2.

shorewall6.conf

http://www.shorewall.netshorewall.conf.html

3.

shorewall-interfaces

http://www.shorewall.netshorewall-interfaces.html

4.

shorewall6.conf

http://www.shorewall.net/manpages6/shorewall6.conf.html

5.

shorewall-accounting

http://www.shorewall.netmanpages/shorewall-accounting.html

6.

shorewall-routestopped

http://www.shorewall.netshorewall-routestopped.html

7.

shorewall6.conf(5)

http://www.shorewall.netshorewall6.conf.html