Provided by: firehol-doc_2.0.3+ds-1_all 
NAME
firehol-params - optional rule parameters
SYNOPSIS
Common
{ src | src4 | src6 } [not] host
{ dst | dst4 | dst6 } [not] host
srctype [not] type
dsttype [not] type
proto [not] protocol
mac [not] macaddr
dscp [not] value class classid
mark [not] id
tos [not] id
custom "iptables-options..."
Router Only
inface [not] interface
outface [not] interface
physin [not] interface
physout [not] interface
Interface Only
uid [not] user
gid [not] group
Logging
log "log text" [level loglevel]
loglimit "log text" [level loglevel]
Other
sport port
dport port
DESCRIPTION
Optional rule parameters are accepted by many commands to narrow the match they make. Not all parameters
are accepted by all commands so you should check the individual commands for exclusions.
All matches are made against the REQUEST. FireHOL automatically sets up the necessary stateful rules to
deal with replies in the reverse direction.
Use the keyword not to match any value other than the one(s) specified.
The logging parameters are unusual in that they do not affect the match, they just cause a log message to
be emitted. Therefore, the logging parameters don't support the not option.
FireHOL is designed so that if you specify a parameter that is also used internally by the command then a
warning will be issued (and the internal version will be used).
COMMON
src, dst
Use src and dst to define the source and destination IP addresses of the request respectively. host
defines the IP or IPs to be matched. Examples:
server4 smtp accept src not 192.0.2.1
server4 smtp accept dst 198.51.100.1
server4 smtp accept src not 192.0.2.1 dst 198.51.100.1
server6 smtp accept src not 2001:DB8:1::/64
server6 smtp accept dst 2001:DB8:2::/64
server6 smtp accept src not 2001:DB8:1::/64 dst 2001:DB8:2::/64
When attempting to create rules for both IPv4 and IPv6 it is generally easier to use the src4, src6, dst4
and dst6 pairs:
server46 smtp accept src4 192.0.2.1 src6 2001:DB8:1::/64
server46 smtp accept dst4 198.51.100.1 dst6 2001:DB8:2::/64
server46 smtp accept dst4 $d4 dst6 $d6 src4 not $d4 src6 not $s6
To keep the rules sane, if one of the 4/6 pair specifies not, then so must the other. If you do not want
to use both IPv4 and IPv6 addresses, you must specify the rule as IPv4 or IPv6 only. It is always
possible to write a second IPv4 or IPv6 only rule.
srctype, dsttype
Use srctype or dsttype to define the source or destination IP address type of the request. type is the
address type category as used in the kernel's network stack. It can be one of:
UNSPEC an unspecified address (i.e. 0.0.0.0)
UNICAST
a unicast address
LOCAL a local address
BROADCAST
a broadcast address
ANYCAST
an anycast address
MULTICAST
a multicast address
BLACKHOLE
a blackhole address
UNREACHABLE
an unreachable address
PROHIBIT
a prohibited address
THROW; NAT; XRESOLVE
undocumented
See iptables(8) or run iptables -m addrtype --help for more information. Examples:
server smtp accept srctype not "UNREACHABLE PROHIBIT"
proto
Use proto to match by protocol. The protocol can be any accepted by iptables(8).
mac
Use mac to match by MAC address. The macaddr matches to the "remote" host. In an interface, "remote"
always means the non-local host. In a router, "remote" refers to the source of requests for servers. It
refers to the destination of requests for clients. Examples:
# Only allow pop3 requests to the e6 host
client pop3 accept mac 00:01:01:00:00:e6
# Only allow hosts other than e7/e8 to access smtp
server smtp accept mac not "00:01:01:00:00:e7 00:01:01:00:00:e8"
dscp
Use dscp to match the DSCP field on packets. For details on DSCP values and classids, see
firehol-dscp(5).
server smtp accept dscp not "0x20 0x30"
server smtp accept dscp not class "BE EF"
mark
Use mark to match marks set on packets. For details on mark ids, see firehol-mark(5).
server smtp accept mark not "20 55"
tos
Use tos to match the TOS field on packets. For details on TOS ids, see firehol-tos(5).
server smtp accept tos not "Maximize-Throughput 0x10"
custom
Use custom to pass arguments directly to iptables(8). All of the parameters must be in a single quoted
string. To pass an option to iptables(8) that itself contains a space you need to quote strings in the
usual bash(1) manner. For example:
server smtp accept custom "--some-option some-value"
server smtp accept custom "--some-option 'some-value second-value'"
ROUTER ONLY
inface, outface
Use inface and outface to define the interface via which a request is received and forwarded
respectively. Use the same format as firehol-interface(5). Examples:
server smtp accept inface not eth0
server smtp accept inface not "eth0 eth1"
server smtp accept inface eth0 outface eth1
physin, physout
Use physin and physout to define the physical interface via which a request is received or send in cases
where the inface or outface is known to be a virtual interface; e.g. a bridge. Use the same format as
firehol-interface(5). Examples:
server smtp accept physin not eth0
INTERFACE ONLY
These parameters match information related to information gathered from the local host. They apply only
to outgoing packets and are silently ignored for incoming requests and requests that will be forwarded.
Note
The Linux kernel infrastructure to match PID/SID and executable names with pid, sid and cmd has
been removed so these options can no longer be used.
uid
Use uid to match the operating system user sending the traffic. The user is a username, uid number or a
quoted list of the two.
For example, to limit which users can access POP3 and IMAP by preventing replies for certain users from
being sent:
client "pop3 imap" accept user not "user1 user2 user3"
Similarly, this will allow all requests to reach the server but prevent replies unless the web server is
running as apache:
server http accept user apache
gid
Use gid to match the operating system group sending the traffic. The group is a group name, gid number
or a quoted list of the two.
LOGGING
log, loglimit
Use log or loglimit to log matching packets to syslog. Unlike iptables(8) logging, this is not an
action: FireHOL will produce multiple iptables(8) commands to accomplish both the action for the rule and
the logging.
Logging is controlled using the FIREHOL_LOG_OPTIONS and FIREHOL_LOG_LEVEL environment variables - see
firehol-variables(5). loglimit additionally honours the FIREHOL_LOG_FREQUENCY and FIREHOL_LOG_BURST
variables.
Specifying level (which takes the same values as FIREHOL_LOG_LEVEL) allows you to override the log level
for a single rule.
LESSER USED PARAMETERS
dport, sport
FireHOL also provides dport, sport and limit which are used internally and rarely needed within
configuration files.
dport and sport require an argument port which can be a name, number, range (FROM:TO) or a quoted list of
ports.
For dport port specifies the destination port of a request and can be useful when matching traffic to
helper commands (such as nat) where there is no implicit port.
For sport port specifies the source port of a request and can be useful when matching traffic to helper
commands (such as nat) where there is no implicit port.
limit
limit requires the arguments frequency and burst and will limit the matching of traffic in both
directions.
SEE ALSO
• firehol(1) - FireHOL program • firehol.conf(5) - FireHOL configuration • firehol-server(5) - server, route commands • firehol-client(5) - client command • firehol-interface(5) - interface definition • firehol-router(5) - router definition • firehol-mark(5) - mark config helper • firehol-tos(5) - tos config helper • firehol-dscp(5) - dscp config helper • firehol-variables(5) - control variables • iptables(8) (http://ipset.netfilter.org/iptables.man.html) - administration tool for IPv4 firewalls • ip6tables(8) (http://ipset.netfilter.org/ip6tables.man.html) - administration tool for IPv6 firewalls • FireHOL Website (http://firehol.org/) • FireHOL Online PDF Manual (http://firehol.org/firehol-manual.pdf) • FireHOL Online HTML Manual (http://firehol.org/manual)
AUTHORS
FireHOL Team.