tests/carp: Rework unicast_v4

For unicast tests, it is sufficient to use wait_for_carp() to verify
the setup is sane. Additional sanity checks are not necessarily
required but can serve purpose for redundancy.

For some unclear reason routed(8) is advertising route to carp BACKUP.
That makes the test flaky. Also routed(8) is marked deprecated and may
be removed from base in the future. Let's just add static route entry
manually for additional sanity checks.

Other noticeable changes:
  1. Add atf_check to configuration steps to prevent potential failure
on setup. That helps diagnosing on failure.
  2. Shorten the names of jails to improve readability.
  3. Prefer `[ifconfig|route|sysctl] -j` over `jexec [ifconfig|route|sysctl]`
to make the lines shorter.

PR:		294817
Reviewed by:	glebius (previous version), pouria, markj
Fixes:		93fbdef51a tests: carp: Update test case unicast_v4 to catch PR 284872
MFC after:	3 days
Differential Revision:	https://reviews.freebsd.org/D56761

tests/sys/netinet/carp.sh

@@ -169,58 +169,66 @@ unicast_v4_body()
 	epair_one=$(vnet_mkepair)
 	epair_two=$(vnet_mkepair)
 
-	vnet_mkjail carp_uni_v4_one ${epair_one}a ${epair_two}a
-	vnet_mkjail carp_uni_v4_two ${epair_one}b
-	vnet_mkjail carp_uni_v4_three ${epair_two}b
+	j="carp_uni_v4_"
 
-	jexec carp_uni_v4_one sysctl net.inet.ip.forwarding=1
-	jexec carp_uni_v4_one ifconfig ${epair_one}a inet 198.51.100.1/25
-	jexec carp_uni_v4_one ifconfig ${epair_two}a inet 198.51.100.129/25
+	# The router
+	vnet_mkjail ${j}one ${epair_one}a ${epair_two}a
+	# The hosts
+	vnet_mkjail ${j}two ${epair_one}b
+	vnet_mkjail ${j}three ${epair_two}b
 
-	jexec carp_uni_v4_two sysctl net.inet.ip.forwarding=1
-	jexec carp_uni_v4_two ifconfig ${epair_one}b 198.51.100.2/25 up
-	jexec carp_uni_v4_two route add 198.51.100.224 198.51.100.1
-	# A peer address x.x.x.224 to catch PR 284872
-	jexec carp_uni_v4_two ifconfig ${epair_one}b add vhid 1 \
-	    peer 198.51.100.224 192.0.2.1/32
+	atf_check -o ignore sysctl -j ${j}one net.inet.ip.forwarding=1
+	atf_check ifconfig -j ${j}one ${epair_one}a inet 198.51.100.1/25
+	atf_check ifconfig -j ${j}one ${epair_two}a inet 198.51.100.129/25
 
-	sleep 0.2
-	jexec carp_uni_v4_three sysctl net.inet.ip.forwarding=1
-	jexec carp_uni_v4_three ifconfig ${epair_two}b 198.51.100.224/25 up
-	jexec carp_uni_v4_three route add 198.51.100.2 198.51.100.129
-	jexec carp_uni_v4_three ifconfig ${epair_two}b add vhid 1 \
-	    peer 198.51.100.2 192.0.2.1/32
+	atf_check ifconfig -j ${j}two ${epair_one}b 198.51.100.2/25 up
+	atf_check -o ignore route -j ${j}two -n add default 198.51.100.1
 
+	atf_check ifconfig -j ${j}three ${epair_two}b 198.51.100.224/25 up
+	atf_check -o ignore route -j ${j}three -n add default 198.51.100.129
+
+	sleep 0.1
 	# Sanity check
-	atf_check -s exit:0 -o ignore jexec carp_uni_v4_two \
+	atf_check -o ignore jexec ${j}one \
+	    ping -c 1 198.51.100.2
+	atf_check -o ignore jexec ${j}one \
+	    ping -c 1 198.51.100.224
+	atf_check -o ignore jexec ${j}two \
 	    ping -c 1 198.51.100.224
 
-	wait_for_carp carp_uni_v4_two ${epair_one}b \
-	    carp_uni_v4_three ${epair_two}b
+	# A peer address x.x.x.224 to catch PR 284872
+	atf_check ifconfig -j ${j}two ${epair_one}b add vhid 1 \
+	    peer 198.51.100.224 192.0.2.1/32
+	sleep 0.2
+	atf_check ifconfig -j ${j}three ${epair_two}b add vhid 1 \
+	    peer 198.51.100.2 192.0.2.1/32
 
-	# Setup RIPv2 route daemon
-	jexec carp_uni_v4_two routed -s -Pripv2
-	jexec carp_uni_v4_three routed -s -Pripv2
-	jexec carp_uni_v4_one routed -Pripv2
+	wait_for_carp ${j}two ${epair_one}b \
+	    ${j}three ${epair_two}b
 
-	# XXX Wait for route propagation
-	sleep 3
+	if is_master ${j}two ${epair_one}b ; then
+		atf_check -o ignore \
+		    route -j ${j}one -n add 192.0.2.1 198.51.100.2
+	fi
 
-	atf_check -s exit:0 -o ignore jexec carp_uni_v4_one \
-	    ping -c 3 192.0.2.1
+	if is_master ${j}three ${epair_two}b ; then
+		atf_check -o ignore \
+		    route -j ${j}one -n add 192.0.2.1 198.51.100.224
+	fi
+
+	# Not necessarily required, but just in case
+	atf_check -o ignore jexec ${j}one \
+	    ping -c 1 192.0.2.1
 
 	# Check that we remain in unicast when tweaking settings
-	atf_check -s exit:0 -o ignore \
-	    jexec carp_uni_v4_two ifconfig ${epair_one}b vhid 1 advskew 2
-	atf_check -s exit:0 -o match:"peer 198.51.100.224" \
-	    jexec carp_uni_v4_two ifconfig ${epair_one}b
+	atf_check -o ignore \
+	    ifconfig -j ${j}two ${epair_one}b vhid 1 advskew 2
+	atf_check -o match:"peer 198.51.100.224" \
+	    ifconfig -j ${j}two ${epair_one}b
 }
 
 unicast_v4_cleanup()
 {
-	jexec carp_uni_v4_one killall routed
-	jexec carp_uni_v4_two killall routed
-	jexec carp_uni_v4_three killall routed
 	vnet_cleanup
 }