git: 6dfb2c2dce0f - stable/13 - pf: Add code to enable filtering for locally delivered packets
- Go to: [ bottom of page ] [ top of archives ] [ this month ]
Date: Sun, 16 Jul 2023 10:44:32 UTC
The branch stable/13 has been updated by dfr:
URL: https://cgit.FreeBSD.org/src/commit/?id=6dfb2c2dce0ffabd783ec24b8d4d128993363f72
commit 6dfb2c2dce0ffabd783ec24b8d4d128993363f72
Author: Doug Rabson <dfr@FreeBSD.org>
AuthorDate: 2023-06-20 13:01:58 +0000
Commit: Doug Rabson <dfr@FreeBSD.org>
CommitDate: 2023-07-14 10:07:58 +0000
pf: Add code to enable filtering for locally delivered packets
This is disabled by default since it potentially changes the behavior of
existing filter rule sets. To enable this extra filter for packets being
delivered locally, use:
sysctl net.pf.filter_local=1
service pf restart
PR: 268717
Reviewed-by: kp
MFC-after: 2 weeks
Differential Revision: https://reviews.freebsd.org/D40373
(cherry picked from commit 3a1f834b5228986a7c14fd60da13cf2700e80996)
---
UPDATING | 12 ++++++++++++
sys/netpfil/pf/pf_ioctl.c | 20 ++++++++++++++++++++
tests/sys/netpfil/common/utils.subr | 3 +--
tests/sys/netpfil/pf/fragmentation.sh | 3 ++-
tests/sys/netpfil/pf/killstate.sh | 24 ++++++++++++++++--------
tests/sys/netpfil/pf/map_e.sh | 3 ++-
tests/sys/netpfil/pf/pass_block.sh | 3 ++-
tests/sys/netpfil/pf/pfsync.sh | 1 +
tests/sys/netpfil/pf/route_to.sh | 3 ++-
tests/sys/netpfil/pf/set_skip.sh | 2 +-
tests/sys/netpfil/pf/table.sh | 6 ++++--
11 files changed, 63 insertions(+), 17 deletions(-)
diff --git a/UPDATING b/UPDATING
index 2ca07499ff00..796f2b751b95 100644
--- a/UPDATING
+++ b/UPDATING
@@ -12,6 +12,18 @@ Items affecting the ports and packages system can be found in
/usr/ports/UPDATING. Please read that file before updating system packages
and/or ports.
+20230619:
+ To enable pf rdr rules for connections initiated from the host, pf
+ filter rules can be optionally enabled for packets delivered
+ locally. This can change the behavior of rules which match packets
+ delivered to lo0. To enable this feature:
+
+ sysctl net.pf.filter_local=1
+ service pf restart
+
+ When enabled, its best to ensure that packets delivered locally are not
+ filtered, e.g. by adding a 'skip on lo' rule.
+
20230404:
llvm-objump is now always installed as objdump. Previously there was
no /usr/bin/objdump unless the WITH_LLVM_BINUTILS knob was used.
diff --git a/sys/netpfil/pf/pf_ioctl.c b/sys/netpfil/pf/pf_ioctl.c
index 07463ecbbcf3..5c9b5d2cebb1 100644
--- a/sys/netpfil/pf/pf_ioctl.c
+++ b/sys/netpfil/pf/pf_ioctl.c
@@ -184,6 +184,12 @@ static MALLOC_DEFINE(M_PFRULE, "pf_rule", "pf(4) rules");
#error PF_QNAME_SIZE must be equal to PF_TAG_NAME_SIZE
#endif
+VNET_DEFINE_STATIC(bool, pf_filter_local) = false;
+#define V_pf_filter_local VNET(pf_filter_local)
+SYSCTL_BOOL(_net_pf, OID_AUTO, filter_local, CTLFLAG_VNET | CTLFLAG_RW,
+ &VNET_NAME(pf_filter_local), false,
+ "Enable filtering for packets delivered to local network stack");
+
static void pf_init_tagset(struct pf_tagset *, unsigned int *,
unsigned int);
static void pf_cleanup_tagset(struct pf_tagset *);
@@ -5670,6 +5676,13 @@ hook_pf(void)
pla.pa_hook = V_pf_ip4_out_hook;
ret = pfil_link(&pla);
MPASS(ret == 0);
+ if (V_pf_filter_local) {
+ pla.pa_flags = PFIL_OUT | PFIL_HEADPTR | PFIL_HOOKPTR;
+ pla.pa_head = V_inet_local_pfil_head;
+ pla.pa_hook = V_pf_ip4_out_hook;
+ ret = pfil_link(&pla);
+ MPASS(ret == 0);
+ }
#endif
#ifdef INET6
pha.pa_type = PFIL_TYPE_IP6;
@@ -5691,6 +5704,13 @@ hook_pf(void)
pla.pa_hook = V_pf_ip6_out_hook;
ret = pfil_link(&pla);
MPASS(ret == 0);
+ if (V_pf_filter_local) {
+ pla.pa_flags = PFIL_OUT | PFIL_HEADPTR | PFIL_HOOKPTR;
+ pla.pa_head = V_inet6_local_pfil_head;
+ pla.pa_hook = V_pf_ip6_out_hook;
+ ret = pfil_link(&pla);
+ MPASS(ret == 0);
+ }
#endif
V_pf_pfil_hooked = 1;
diff --git a/tests/sys/netpfil/common/utils.subr b/tests/sys/netpfil/common/utils.subr
index d0028e663c45..2a2ee0af8ebf 100644
--- a/tests/sys/netpfil/common/utils.subr
+++ b/tests/sys/netpfil/common/utils.subr
@@ -55,11 +55,10 @@ firewall_config()
jexec ${jname} ipfw -q -f flush
jexec ${jname} /bin/sh $cwd/ipfw.rule
elif [ ${fw} == "pf" ]; then
+ jexec ${jname} sysctl net.pf.filter_local=1
jexec ${jname} pfctl -e
jexec ${jname} pfctl -F all
jexec ${jname} pfctl -f $cwd/pf.rule
- jexec ${jname} pfilctl link -o pf:default-out inet-local
- jexec ${jname} pfilctl link -o pf:default-out6 inet6-local
elif [ ${fw} == "ipf" ]; then
jexec ${jname} ipf -E
jexec ${jname} ipf -Fa -f $cwd/ipf.rule
diff --git a/tests/sys/netpfil/pf/fragmentation.sh b/tests/sys/netpfil/pf/fragmentation.sh
index ae394324cddc..e62eb141eebd 100644
--- a/tests/sys/netpfil/pf/fragmentation.sh
+++ b/tests/sys/netpfil/pf/fragmentation.sh
@@ -112,7 +112,8 @@ v6_body()
"scrub fragment reassemble" \
"block in" \
"pass in inet6 proto icmp6 icmp6-type { neighbrsol, neighbradv }" \
- "pass in inet6 proto icmp6 icmp6-type { echoreq, echorep }"
+ "pass in inet6 proto icmp6 icmp6-type { echoreq, echorep }" \
+ "set skip on lo"
# Host test
atf_check -s exit:0 -o ignore \
diff --git a/tests/sys/netpfil/pf/killstate.sh b/tests/sys/netpfil/pf/killstate.sh
index c2942aab41f2..7b32bacdf82c 100644
--- a/tests/sys/netpfil/pf/killstate.sh
+++ b/tests/sys/netpfil/pf/killstate.sh
@@ -49,7 +49,8 @@ v4_body()
jexec alcatraz pfctl -e
pft_set_rules alcatraz "block all" \
- "pass in proto icmp"
+ "pass in proto icmp" \
+ "set skip on lo"
# Sanity check & establish state
# Note: use pft_ping so we always use the same ID, so pf considers all
@@ -121,7 +122,8 @@ v6_body()
jexec alcatraz pfctl -e
pft_set_rules alcatraz "block all" \
- "pass in proto icmp6"
+ "pass in proto icmp6" \
+ "set skip on lo"
# Sanity check & establish state
# Note: use pft_ping so we always use the same ID, so pf considers all
@@ -189,7 +191,8 @@ label_body()
pft_set_rules alcatraz "block all" \
"pass in proto tcp label bar" \
- "pass in proto icmp label foo"
+ "pass in proto icmp label foo" \
+ "set skip on lo"
# Sanity check & establish state
# Note: use pft_ping so we always use the same ID, so pf considers all
@@ -255,7 +258,8 @@ multilabel_body()
jexec alcatraz pfctl -e
pft_set_rules alcatraz "block all" \
- "pass in proto icmp label foo label bar"
+ "pass in proto icmp label foo label bar" \
+ "set skip on lo"
# Sanity check & establish state
# Note: use pft_ping so we always use the same ID, so pf considers all
@@ -289,7 +293,8 @@ multilabel_body()
--replyif ${epair}a
pft_set_rules alcatraz "block all" \
- "pass in proto icmp label foo label bar"
+ "pass in proto icmp label foo label bar" \
+ "set skip on lo"
# Reestablish state
atf_check -s exit:0 -o ignore ${common_dir}/pft_ping.py \
@@ -333,7 +338,8 @@ gateway_body()
jexec alcatraz pfctl -e
pft_set_rules alcatraz "block all" \
- "pass in reply-to (${epair}b 192.0.2.1) proto icmp"
+ "pass in reply-to (${epair}b 192.0.2.1) proto icmp" \
+ "set skip on lo"
# Sanity check & establish state
# Note: use pft_ping so we always use the same ID, so pf considers all
@@ -475,7 +481,8 @@ interface_body()
jexec alcatraz pfctl -e
pft_set_rules alcatraz "block all" \
- "pass in proto icmp"
+ "pass in proto icmp" \
+ "set skip on lo"
# Sanity check & establish state
# Note: use pft_ping so we always use the same ID, so pf considers all
@@ -535,7 +542,8 @@ id_body()
pft_set_rules alcatraz "block all" \
"pass in proto tcp" \
- "pass in proto icmp"
+ "pass in proto icmp" \
+ "set skip on lo"
# Sanity check & establish state
# Note: use pft_ping so we always use the same ID, so pf considers all
diff --git a/tests/sys/netpfil/pf/map_e.sh b/tests/sys/netpfil/pf/map_e.sh
index cc68fe26be5e..7a2b33069c59 100644
--- a/tests/sys/netpfil/pf/map_e.sh
+++ b/tests/sys/netpfil/pf/map_e.sh
@@ -66,7 +66,8 @@ map_e_body()
pft_set_rules echo "block return all" \
"pass in on ${epair_echo}b inet proto tcp from 198.51.100.1 port 19720:19723 to (${epair_echo}b) port 7" \
"pass in on ${epair_echo}b inet proto tcp from 198.51.100.1 port 36104:36107 to (${epair_echo}b) port 7" \
- "pass in on ${epair_echo}b inet proto tcp from 198.51.100.1 port 52488:52491 to (${epair_echo}b) port 7"
+ "pass in on ${epair_echo}b inet proto tcp from 198.51.100.1 port 52488:52491 to (${epair_echo}b) port 7" \
+ "set skip on lo"
i=0
while [ ${i} -lt ${NC_TRY_COUNT} ]
diff --git a/tests/sys/netpfil/pf/pass_block.sh b/tests/sys/netpfil/pf/pass_block.sh
index 589b89891729..51c8c432038a 100644
--- a/tests/sys/netpfil/pf/pass_block.sh
+++ b/tests/sys/netpfil/pf/pass_block.sh
@@ -230,7 +230,8 @@ urpf_body()
--replyif ${epair_one}a
pft_set_rules alcatraz \
- "block quick from urpf-failed"
+ "block quick from urpf-failed" \
+ "set skip on lo"
jexec alcatraz pfctl -e
# Correct source still works
diff --git a/tests/sys/netpfil/pf/pfsync.sh b/tests/sys/netpfil/pf/pfsync.sh
index 513280331255..c70d7690c37b 100644
--- a/tests/sys/netpfil/pf/pfsync.sh
+++ b/tests/sys/netpfil/pf/pfsync.sh
@@ -149,6 +149,7 @@ defer_body()
route add -net 203.0.113.0/24 198.51.100.1
# Enable pf
+ jexec alcatraz sysctl net.pf.filter_local=0
jexec alcatraz pfctl -e
pft_set_rules alcatraz \
"set skip on ${epair_sync}a" \
diff --git a/tests/sys/netpfil/pf/route_to.sh b/tests/sys/netpfil/pf/route_to.sh
index 570d1feb36ff..4edd9a56de3b 100644
--- a/tests/sys/netpfil/pf/route_to.sh
+++ b/tests/sys/netpfil/pf/route_to.sh
@@ -230,7 +230,8 @@ multiwanlocal_body()
"block in" \
"block out" \
"pass out quick route-to (${epair_cl_two}a 203.0.113.129) inet proto tcp from 203.0.113.128 to any port 7" \
- "pass out on ${epair_cl_one}a inet proto tcp from any to any port 7"
+ "pass out on ${epair_cl_one}a inet proto tcp from any to any port 7" \
+ "set skip on lo"
# This should work
result=$(jexec client nc -N -w 1 192.0.2.2 7 | wc -c)
diff --git a/tests/sys/netpfil/pf/set_skip.sh b/tests/sys/netpfil/pf/set_skip.sh
index ce7b1900ae00..9e9d5a5322f1 100644
--- a/tests/sys/netpfil/pf/set_skip.sh
+++ b/tests/sys/netpfil/pf/set_skip.sh
@@ -101,7 +101,7 @@ set_skip_dynamic_body()
vnet_mkjail alcatraz
jexec alcatraz pfctl -e
pft_set_rules alcatraz "set skip on epair" \
- "block"
+ "block on ! lo"
epair=$(vnet_mkepair)
ifconfig ${epair}a 192.0.2.2/24 up
diff --git a/tests/sys/netpfil/pf/table.sh b/tests/sys/netpfil/pf/table.sh
index cc95daba048b..a70c003e71ae 100644
--- a/tests/sys/netpfil/pf/table.sh
+++ b/tests/sys/netpfil/pf/table.sh
@@ -52,7 +52,8 @@ v4_counters_body()
"table <foo> counters { 192.0.2.1 }" \
"block all" \
"pass in from <foo> to any" \
- "pass out from any to <foo>"
+ "pass out from any to <foo>" \
+ "set skip on lo"
atf_check -s exit:0 -o ignore ping -c 3 192.0.2.2
@@ -91,7 +92,8 @@ v6_counters_body()
"table <foo6> counters { 2001:db8:42::1 }" \
"block all" \
"pass in from <foo6> to any" \
- "pass out from any to <foo6>"
+ "pass out from any to <foo6>" \
+ "set skip on lo"
atf_check -s exit:0 -o ignore ping -6 -c 3 2001:db8:42::2