Bring in some examples (and create space for future work here):

- Add OpenBSD example rulesets as advertised in etc/pf.conf and pf.conf(5)
- Tweak the pointer to fit the FreeBSD default location share/examples/pf
- Account for the new directory in BSD.usr.dist (no hier(7) change required
  as share/examples is an opaque item there).

Obtained from:	OpenBSD
Reminded by:	Thomas T. Veldhouse
PR:		docs/71691
MFC after:	2 days

11 files changed, 399 insertions, 0 deletions

diff --git a/share/examples/Makefile b/share/examples/Makefile
index 85f815f..d284821 100644
--- a/share/examples/Makefile
+++ b/share/examples/Makefile
@@ -290,6 +290,9 @@ SUBDIR=	smbfs
 .if !defined(NO_IPFILTER)
 SUBDIR+=ipfilter
 .endif
+.if !defined(NO_PF)
+SUBDIR+=pf
+.endif
 .endif
 
 .include <bsd.subdir.mk>
diff --git a/share/examples/pf/Makefile b/share/examples/pf/Makefile
new file mode 100644
index 0000000..fbc655c
--- /dev/null
+++ b/share/examples/pf/Makefile
@@ -0,0 +1,11 @@
+# $FreeBSD$
+
+NOOBJ=	noobj
+
+FILES=	faq-example1 faq-example2 faq-example3 \
+	ackpri queue1 queue2 queue3 queue4 \
+	spamd
+
+FILESDIR=	${SHAREDIR}/examples/pf
+
+.include <bsd.prog.mk>
diff --git a/share/examples/pf/ackpri b/share/examples/pf/ackpri
new file mode 100644
index 0000000..18f008d
--- /dev/null
+++ b/share/examples/pf/ackpri
@@ -0,0 +1,33 @@
+# $FreeBSD$
+# $OpenBSD: ackpri,v 1.2 2003/03/10 14:24:33 henning Exp $
+
+# Use a simple priority queue to prioritize empty (no payload) TCP ACKs,
+# which dramatically improves throughput on (asymmetric) links when the
+# reverse direction is saturated. The empty ACKs use an insignificant
+# part of the bandwidth, but if they get delayed, downloads suffer
+# badly, so prioritize them.
+
+# Example: 512/128 kbps ADSL. Download is 50 kB/s. When a concurrent
+# upload saturates the uplink, download drops to 7 kB/s. With the
+# priority queue below, download drops only to 48 kB/s.
+
+# Replace lo0 with your real external interface
+
+ext_if="lo0"
+
+# For a 512/128 kbps ADSL with PPPoE link, using "bandwidth 100Kb"
+# is optimal. Some experimentation might be needed to find the best
+# value. If it's set too high, the priority queue is not effective, and
+# if it's set too low, the available bandwidth is not fully used.
+# A good starting point would be real_uplink_bandwidth * 90 / 100.
+
+altq on $ext_if priq bandwidth 100Kb queue { q_pri, q_def }
+queue q_pri priority 7
+queue q_def priority 1 priq(default)
+
+pass out on $ext_if proto tcp from $ext_if to any flags S/SA \
+	keep state queue (q_def, q_pri)
+
+pass in  on $ext_if proto tcp from any to $ext_if flags S/SA \
+	keep state queue (q_def, q_pri)
+
diff --git a/share/examples/pf/faq-example1 b/share/examples/pf/faq-example1
new file mode 100644
index 0000000..2981203
--- /dev/null
+++ b/share/examples/pf/faq-example1
@@ -0,0 +1,48 @@
+# $FreeBSD$
+# $OpenBSD: faq-example1,v 1.2 2003/08/06 16:04:45 henning Exp $
+
+#
+# Firewall for Home or Small Office
+# http://www.openbsd.org/faq/pf/example1.html
+#
+
+
+# macros
+int_if = "fxp0"
+ext_if = "ep0"
+
+tcp_services = "{ 22, 113 }"
+icmp_types = "echoreq"
+
+priv_nets = "{ 127.0.0.0/8, 192.168.0.0/16, 172.16.0.0/12, 10.0.0.0/8 }"
+        
+# options
+set block-policy return
+set loginterface $ext_if
+
+# scrub
+scrub in all
+
+# nat/rdr
+nat on $ext_if from $int_if:network to any -> ($ext_if)
+rdr on $int_if proto tcp from any to any port 21 -> 127.0.0.1 \
+   port 8021
+
+# filter rules
+block all
+
+pass quick on lo0 all
+
+block drop in  quick on $ext_if from $priv_nets to any
+block drop out quick on $ext_if from any to $priv_nets
+
+pass in on $ext_if inet proto tcp from any to ($ext_if) \
+   port $tcp_services flags S/SA keep state
+
+pass in inet proto icmp all icmp-type $icmp_types keep state
+
+pass in  on $int_if from $int_if:network to any keep state
+pass out on $int_if from any to $int_if:network keep state
+
+pass out on $ext_if proto tcp all modulate state flags S/SA
+pass out on $ext_if proto { udp, icmp } all keep state
diff --git a/share/examples/pf/faq-example2 b/share/examples/pf/faq-example2
new file mode 100644
index 0000000..66e2f25
--- /dev/null
+++ b/share/examples/pf/faq-example2
@@ -0,0 +1,89 @@
+# $FreeBSD$
+# $OpenBSD: faq-example2,v 1.2 2003/08/06 16:04:45 henning Exp $
+
+#
+# Small, Home Network
+# http://www.openbsd.org/faq/pf/queueing.html#example1
+#
+
+
+# enable queueing on the external interface to control traffic going to
+# the Internet. use the priq scheduler to control only priorities. set
+# the bandwidth to 610Kbps to get the best performance out of the TCP
+# ACK queue.
+
+altq on fxp0 priq bandwidth 610Kb queue { std_out, ssh_im_out, dns_out, \
+        tcp_ack_out }
+
+# define the parameters for the child queues.
+# std_out      - the standard queue. any filter rule below that does not
+#                explicitly specify a queue will have its traffic added
+#                to this queue.
+# ssh_im_out   - interactive SSH and various instant message traffic.
+# dns_out      - DNS queries.
+# tcp_ack_out  - TCP ACK packets with no data payload.
+
+queue std_out     priq(default)
+queue ssh_im_out  priority 4 priq(red)
+queue dns_out     priority 5
+queue tcp_ack_out priority 6
+
+# enable queueing on the internal interface to control traffic coming in
+# from the Internet. use the cbq scheduler to control bandwidth. max
+# bandwidth is 2Mbps.
+
+altq on dc0 cbq bandwidth 2Mb queue { std_in, ssh_im_in, dns_in, bob_in }
+
+# define the parameters for the child queues.
+# std_in      - the standard queue. any filter rule below that does not
+#               explicitly specify a queue will have its traffic added
+#               to this queue.
+# ssh_im_in   - interactive SSH and various instant message traffic.
+# dns_in      - DNS replies.
+# bob_in      - bandwidth reserved for Bob's workstation. allow him to
+#               borrow.
+
+queue std_in    cbq(default)
+queue ssh_im_in priority 4
+queue dns_in    priority 5
+queue bob_in    bandwidth 80Kb cbq(borrow)
+
+
+# ... in the filtering section of pf.conf ...
+
+alice         = "192.168.0.2"
+bob           = "192.168.0.3"
+charlie       = "192.168.0.4"
+local_net     = "192.168.0.0/24"
+ssh_ports     = "{ 22 2022 }"
+im_ports      = "{ 1863 5190 5222 }"
+
+# filter rules for fxp0 inbound
+block in on fxp0 all
+
+# filter rules for fxp0 outbound
+block out on fxp0 all
+pass  out on fxp0 inet proto tcp from (fxp0) to any flags S/SA \
+        keep state queue(std_out, tcp_ack_out)
+pass  out on fxp0 inet proto { udp icmp } from (fxp0) to any keep state
+pass  out on fxp0 inet proto { tcp udp } from (fxp0) to any port domain \
+        keep state queue dns_out
+pass  out on fxp0 inet proto tcp from (fxp0) to any port $ssh_ports \
+        flags S/SA keep state queue(std_out, ssh_im_out)
+pass  out on fxp0 inet proto tcp from (fxp0) to any port $im_ports \
+        flags S/SA keep state queue(ssh_im_out, tcp_ack_out)
+
+# filter rules for dc0 inbound
+block in on dc0 all
+pass  in on dc0 from $local_net
+
+# filter rules for dc0 outbound
+block out on dc0 all
+pass  out on dc0 from any to $local_net
+pass  out on dc0 proto { tcp udp } from any port domain to $local_net \
+        queue dns_in
+pass  out on dc0 proto tcp from any port $ssh_ports to $local_net \
+        queue(std_in, ssh_im_in)
+pass  out on dc0 proto tcp from any port $im_ports to $local_net \
+        queue ssh_im_in
+pass  out on dc0 from any to $bob queue bob_in
diff --git a/share/examples/pf/faq-example3 b/share/examples/pf/faq-example3
new file mode 100644
index 0000000..c6b7355
--- /dev/null
+++ b/share/examples/pf/faq-example3
@@ -0,0 +1,119 @@
+# $FreeBSD$
+# $OpenBSD: faq-example3,v 1.2 2003/08/06 16:04:45 henning Exp $
+
+#
+# Company Network
+# http://www.openbsd.org/faq/pf/queueing.html#example2
+#
+
+   
+# enable queueing on the external interface to queue packets going out
+# to the Internet. use the cbq scheduler so that the bandwidth use of
+# each queue can be controlled. the max outgoing bandwidth is 1.5Mbps.
+
+altq on fxp0 cbq bandwidth 1.5Mb queue { std_ext, www_ext, boss_ext }
+
+# define the parameters for the child queues.
+# std_ext        - the standard queue. also the default queue for
+#                  outgoing traffic on fxp0.
+# www_ext        - container queue for WWW server queues. limit to
+#                  500Kbps.
+#   www_ext_http - http traffic from the WWW server
+#   www_ext_misc - all non-http traffic from the WWW server
+# boss_ext       - traffic coming from the boss's computer
+
+queue std_ext        cbq(default)
+queue www_ext        bandwidth 500Kb { www_ext_http, www_ext_misc }
+  queue www_ext_http priority 3 cbq(red)
+  queue www_ext_misc priority 1
+queue boss_ext       priority 3
+
+# enable queueing on the internal interface to control traffic coming
+# from the Internet or the DMZ. use the cbq scheduler to control the
+# bandwidth of each queue. bandwidth on this interface is set to the
+# maximum. traffic coming from the DMZ will be able to use all of this
+# bandwidth while traffic coming from the Internet will be limited to
+# 1.0Mbps (because 0.5Mbps (500Kbps) is being allocated to fxp1).
+
+altq on dc0 cbq bandwidth 100% queue { net_int, www_int }
+
+# define the parameters for the child queues.
+# net_int    - container queue for traffic from the Internet. bandwidth
+#              is 1.0Mbps.
+#   std_int  - the standard queue. also the default queue for outgoing
+#              traffic on dc0.
+#   it_int   - traffic to the IT Dept network.
+#   boss_int - traffic to the boss's PC.
+# www_int    - traffic from the WWW server in the DMZ.
+
+queue net_int    bandwidth 1.0Mb { std_int, it_int, boss_int }
+  queue std_int  cbq(default)
+  queue it_int   bandwidth 500Kb cbq(borrow)
+  queue boss_int priority 3
+queue www_int    cbq(red)
+
+# enable queueing on the DMZ interface to control traffic destined for
+# the WWW server. cbq will be used on this interface since detailed
+# control of bandwidth is necessary. bandwidth on this interface is set
+# to the maximum. traffic from the internal network will be able to use
+# all of this bandwidth while traffic from the Internet will be limited
+# to 500Kbps.
+
+altq on fxp1 cbq bandwidth 100% queue { internal_dmz, net_dmz }
+
+# define the parameters for the child queues.
+# internal_dmz   - traffic from the internal network.
+# net_dmz        - container queue for traffic from the Internet.
+#   net_dmz_http - http traffic.
+#   net_dmz_misc - all non-http traffic. this is also the default queue.
+
+queue internal_dmz      # no special settings needed
+queue net_dmz        bandwidth 500Kb { net_dmz_http, net_dmz_misc }
+  queue net_dmz_http priority 3 cbq(red)
+  queue net_dmz_misc priority 1 cbq(default)
+
+
+# ... in the filtering section of pf.conf ...
+
+main_net  = "192.168.0.0/24"
+it_net    = "192.168.1.0/24"
+int_nets  = "{ 192.168.0.0/24, 192.168.1.0/24 }"
+dmz_net   = "10.0.0.0/24"
+
+boss      = "192.168.0.200"
+wwwserv   = "10.0.0.100"
+
+# default deny
+block on { fxp0, fxp1, dc0 } all
+
+# filter rules for fxp0 inbound
+pass in on fxp0 proto tcp from any to $wwwserv port { 21, \
+        > 49151 } flags S/SA keep state queue www_ext_misc
+pass in on fxp0 proto tcp from any to $wwwserv port 80 \
+        flags S/SA keep state queue www_ext_http
+
+# filter rules for fxp0 outbound
+pass out on fxp0 from $int_nets to any keep state
+pass out on fxp0 from $boss to any keep state queue boss_ext
+
+# filter rules for dc0 inbound
+pass in on dc0 from $int_nets to any keep state
+pass in on dc0 from $it_net to any queue it_int
+pass in on dc0 from $boss to any queue boss_int
+pass in on dc0 proto tcp from $int_nets to $wwwserv port { 21, 80, \
+        > 49151 } flags S/SA keep state queue www_int
+
+# filter rules for dc0 outbound
+pass out on dc0 from dc0 to $int_nets
+
+# filter rules for fxp1 inbound
+pass in on fxp1 proto { tcp, udp } from $wwwserv to any port 53 \
+        keep state
+
+# filter rules for fxp1 outbound
+pass out on fxp1 proto tcp from any to $wwwserv port { 21, \
+        > 49151 } flags S/SA keep state queue net_dmz_misc
+pass out on fxp1 proto tcp from any to $wwwserv port 80 \
+        flags S/SA keep state queue net_dmz_http
+pass out on fxp1 proto tcp from $int_nets to $wwwserv port { 80, \
+        21, > 49151 } flags S/SA keep state queue internal_dmz
diff --git a/share/examples/pf/queue1 b/share/examples/pf/queue1
new file mode 100644
index 0000000..73c3839
--- /dev/null
+++ b/share/examples/pf/queue1
@@ -0,0 +1,23 @@
+# $FreeBSD$
+# $OpenBSD: queue1,v 1.3 2003/01/20 16:14:23 henning Exp $
+
+ext_if = "dc0"
+
+altq on $ext_if cbq bandwidth 10Mb \
+    queue { deflt, http, ssh, mail, rsets }
+queue	deflt bandwidth 10% priority 0 cbq(default ecn)
+queue	http bandwidth 1.5Mb priority 3 { http_vhosts, http_cust1 }
+queue	 http_vhosts bandwidth 40% cbq(borrow red)
+queue	 http_cust1 bandwidth 0.5Mb
+queue	mail bandwidth 10% priority 1
+queue	ssh bandwidth 100Kb priority 7 cbq(borrow)
+queue	rsets bandwidth 7500b priority 0 cbq(red)
+
+block return in on $ext_if inet all queue rsets
+pass in on $ext_if inet proto tcp from any to any port 80 keep state queue http
+pass out on $ext_if inet proto tcp from any to any port 22 keep state queue ssh
+pass in  on $ext_if inet proto tcp from any to any port 22 keep state queue ssh
+pass out on $ext_if inet proto tcp from any to any port 25 keep state queue mail
+pass out on $ext_if inet all keep state
+
+
diff --git a/share/examples/pf/queue2 b/share/examples/pf/queue2
new file mode 100644
index 0000000..20684e9
--- /dev/null
+++ b/share/examples/pf/queue2
@@ -0,0 +1,29 @@
+# $FreeBSD$
+# $OpenBSD: queue2,v 1.2 2003/01/20 16:14:23 henning Exp $
+# advanced queue example.
+# give interactive ssh traffic priority over ssh bulk transfers (scp, sftp)
+
+ext_if="dc0"
+developerhosts="192.168.2.0/24"
+employeehosts="192.168.0.0/23"
+
+altq on $ext_if cbq bandwidth 5Mb queue { std, http, mail, ssh }
+
+queue std bandwidth 10% cbq(default)
+queue http bandwidth 60% priority 2 cbq(borrow red) { employees, developers }
+queue  developers bandwidth 75% cbq(borrow)
+queue  employees bandwidth 15%
+queue mail bandwidth 10% priority 0 cbq(borrow ecn)
+queue ssh bandwidth 20% cbq(borrow) { ssh_interactive, ssh_bulk }
+queue  ssh_interactive priority 7
+queue  ssh_bulk priority 0
+
+block return out on $ext_if inet all queue std
+pass out on $ext_if inet proto tcp from $developerhosts to any port 80 \
+    keep state queue developers
+pass out on $ext_if inet proto tcp from $employeehosts to any port 80 \
+    keep state queue employees
+pass out on $ext_if inet proto tcp from any to any port 22 \
+    keep state queue(ssh_bulk, ssh_interactive)
+pass out on $ext_if inet proto tcp from any to any port 25 \
+    keep state queue mail
diff --git a/share/examples/pf/queue3 b/share/examples/pf/queue3
new file mode 100644
index 0000000..855e74f
--- /dev/null
+++ b/share/examples/pf/queue3
@@ -0,0 +1,16 @@
+# $FreeBSD$
+# $OpenBSD: queue3,v 1.2 2003/01/20 16:14:23 henning Exp $
+# simple PRIQ example
+
+ext_if="lo0"
+
+altq on $ext_if priq bandwidth 10Mb queue { pri-low pri-med pri-high }
+queue pri-low priority 0
+queue pri-med priority 1 priq(default)
+queue pri-high priority 2
+
+pass out on $ext_if proto tcp from any to any port 22 keep state \
+    queue(pri-med, pri-high)
+pass out on $ext_if proto tcp from any to any port 80 keep state queue pri-med
+pass in  on $ext_if proto tcp from any to any port 80 keep state queue pri-low
+
diff --git a/share/examples/pf/queue4 b/share/examples/pf/queue4
new file mode 100644
index 0000000..0a24a06
--- /dev/null
+++ b/share/examples/pf/queue4
@@ -0,0 +1,20 @@
+# $FreeBSD$
+# $OpenBSD: queue4,v 1.2 2003/08/22 21:50:34 david Exp $
+#
+# Hierarchical queueing for a university.
+# Three faculties; engineering, law and art are defined.
+# Departments under the engineering faculty are defined as child queues.
+# The total bandwidth for engineering faculty is shared between three
+# departments. CS department gets the half of the bandwidth, EE and IE
+# departments get the thirty percent and twenty percent of bandwidth
+# respectively. These sibling departments can use more than their linkshare
+# whenever there is no backlogged sibling queue but when a queue gets
+# backlogged, it is guaranteed that the queue gets its linkshare.
+
+altq on dc0 bandwidth 16Mb hfsc queue { eng law art }
+queue eng bandwidth 10Mb { cs ee ie }
+queue  cs hfsc( default linkshare 50% ) 
+queue  ee hfsc( linkshare 30% ) 
+queue  ie hfsc( linkshare 20% )
+queue law bandwidth 3Mb
+queue art bandwidth 3Mb
diff --git a/share/examples/pf/spamd b/share/examples/pf/spamd
new file mode 100644
index 0000000..780e879
--- /dev/null
+++ b/share/examples/pf/spamd
@@ -0,0 +1,8 @@
+# $FreeBSD$
+# $OpenBSD: spamd,v 1.1 2003/08/22 15:25:01 henning Exp $
+
+# spamd-setup puts addresses to be redirected into table <spamd>.
+
+table <spamd> persist
+no rdr on { lo0, lo1 } from any to any
+rdr inet proto tcp from <spamd> to any port smtp -> 127.0.0.1 port 8025