[LTP] [RFC PATCH 1/2] lib/test_net.sh: Add unused IP address helper functions

[Petr Vorel]

Signed-off-by: Petr Vorel <pvorel@suse.cz>
---
Changes from v7:
We've been talking about tst_ipaddr_un function. I decided to split it into two
functions as there is different requirement for creating "unused" based IP
addresses. Keeping both usages in one function would require either to specify
type parameter even if it's not needed or complicated checks if
tst_ipaddr_un_host would have to different usages:
tst_ipaddr_un_host [TYPE] [COUNTER]
tst_ipaddr_un_host OCTET_3 [OCTET_4]

You might don't see a reason for tst_ipaddr_un_ip as IP address can be created
"inline" with IPV4_NET16_UNUSED/IPV6_NET32_UNUSED variables, like you do for
example in testcases/network/stress/ipsec/ipsec_lib.sh or
testcases/network/stress/interface/if-addr-addlarge.  I just feel strange to
mixing these approaches (create IP address sometimes with function and
sometimes "inline").

Even unused addresses are used exclusively in stress tests I added these in
general network library.

I also added very simple IPv6 format address optimization (just don't include
':0' on third hextet).
---
 testcases/lib/test_net.sh | 78 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 75 insertions(+), 3 deletions(-)

diff --git a/testcases/lib/test_net.sh b/testcases/lib/test_net.sh
index c11747a27..6575c77f4 100644
--- a/testcases/lib/test_net.sh
+++ b/testcases/lib/test_net.sh
@@ -219,7 +219,7 @@ tst_ipaddr()
 {
 	local type="${1:-lhost}"
 	local ipv="${TST_IPV6:-4}"
-	local tst_host=
+	local tst_host
 
 	if [ "$type" = "lhost" ]; then
 		eval "tst_host=\$LHOST_IPV${ipv}_HOST"
@@ -234,6 +234,77 @@ tst_ipaddr()
 	fi
 }
 
+# Get IP address of unused network, specified by type and counter.
+# This is useful for generating row of unique addresses based on lhost/rhost.
+# tst_ipaddr_un_host [TYPE] [COUNTER]
+# TYPE: { lhost | rhost }; Default value is 'lhost'.
+# COUNTER: Integer value for counting 4th octet and 3rd octet; Default is 1.
+tst_ipaddr_un_host()
+{
+	local type="${1:-lhost}"
+	local counter="${2:-1}"
+	local octet_3 octet_4 max_octet_3 max_octet_4 tmp
+
+	[ $counter -lt 1 ] && counter=1
+	[ "$TST_IPV6" ] && max_octet_3=65535 || max_octet_3=255
+	max_octet_4=$((max_octet_3 - 1))
+	tmp=$((counter * 2))
+	[ "$type" = "rhost" ] && tmp=$((tmp - 1))
+
+	octet_4=$((tmp % max_octet_4))
+	octet_3=$((tmp / max_octet_4))
+
+	if [ $octet_4 -eq 0 ]; then
+		octet_4=$max_octet_4
+		octet_3=$((octet_3 - 1))
+	fi
+
+	[ $octet_3 -gt $max_octet_3 ] && octet_3=$max_octet_3
+	[ $octet_4 -gt $max_octet_4 ] && octet_4=$max_octet_4
+
+	if [ "$TST_IPV6" ]; then
+		[ $octet_3 -gt 0 ] && octet_3="$(printf %x $octet_3)" || octet_3=
+		[ $octet_4 -gt 0 -o "$octet_3" ] && octet_4="$(printf %x $octet_4)" || octet_4=
+		[ "$octet_3" -a "$octet_4" ] && octet_4=":$octet_4"
+		echo "${IPV6_NET32_UNUSED}::${octet_3}${octet_4}"
+	else
+		echo "${IPV4_NET16_UNUSED}.${octet_3}.${octet_4}"
+	fi
+}
+
+# Get IP address of unused network, specified by 3rd and 4th octet.
+# This is useful when 3rd and/or 4th octet are needed to be defined.
+# tst_ipaddr_un_ip [OCTET_3] [OCTET_4]
+# OCTET_3: Integer or hex value of 3rd octet; Default value is 0.
+# OCTET_4: Integer or hex value of 4th octet; Default value is 0.
+tst_ipaddr_un_ip()
+{
+	local octet_3="${1:-0}"
+	local octet_4="${2:-0}"
+	local max
+
+	[ "$TST_IPV6" ] && max=65535 || max=255
+
+	if [ "$TST_IPV6" ]; then
+		octet_3=$(printf %d $octet_3)
+		octet_4=$(printf %d $octet_4)
+	fi
+
+	[ $octet_3 -lt 0 ] && octet_3=0
+	[ $octet_4 -lt 0 ] && octet_4=1
+	[ $octet_3 -gt $max ] && octet_3=$max
+	[ $octet_4 -gt $max ] && octet_4=$max
+
+	if [ "$TST_IPV6" ]; then
+		[ $octet_3 -gt 0 ] && octet_3="$(printf %x $octet_3)" || octet_3=
+		[ $octet_4 -gt 0 -o "$octet_3" ] && octet_4="$(printf %x $octet_4)" || octet_4=
+		[ "$octet_3" -a "$octet_4" ] && octet_4=":$octet_4"
+		echo "${IPV6_NET32_UNUSED}::${octet_3}${octet_4}"
+	else
+		echo "${IPV4_NET16_UNUSED}.${octet_3}.${octet_4}"
+	fi
+}
+
 # tst_init_iface [TYPE] [LINK]
 # TYPE: { lhost | rhost }; Default value is 'lhost'.
 # LINK: link number starting from 0. Default value is '0'.
@@ -436,6 +507,7 @@ tst_ping()
 	local src_iface="${1:-$(tst_iface)}"
 	local dst_addr="${2:-$(tst_ipaddr rhost)}"; shift $(( $# >= 2 ? 2 : 0 ))
 	local msg_sizes="$*"
+	local msg="tst_ping IPv${TST_IPV6:-4} iface $src_iface, msg_size"
 	local ret=0
 
 	# ping cmd use 56 as default message size
@@ -444,9 +516,9 @@ tst_ping()
 			-s $size -i 0 > /dev/null 2>&1
 		ret=$?
 		if [ $ret -eq 0 ]; then
-			tst_resm TINFO "tst_ping IPv${TST_IPV6:-4} msg_size $size pass"
+			tst_resm TINFO "$msg $size: pass"
 		else
-			tst_resm TINFO "tst_ping IPv${TST_IPV6:-4} msg_size $size fail"
+			tst_resm TINFO "$msg $size: fail"
 			break
 		fi
 	done
-- 
2.13.2