[PATCH iproute2] ip: allow ip address show to list addresses with certain flags not being set

[Heiner Kallweit <hkallweit1@gmail.com>]

Sometimes it's needed to have "ip address show" list only addresses
with certain flags not being set, e.g. in network scripts.
As an example one might want to exclude addresses in "tentative"
or "deprecated" state.

Support listing addresses with flags tentative, deprecated, dadfailed
not being set by prefixing the respective flag with a minus.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
 ip/ipaddress.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/ip/ipaddress.c b/ip/ipaddress.c
index 221ae1f..a071572 100644
--- a/ip/ipaddress.c
+++ b/ip/ipaddress.c
@@ -80,7 +80,7 @@ static void usage(void)
 	fprintf(stderr, "SCOPE-ID := [ host | link | global | NUMBER ]\n");
 	fprintf(stderr, "FLAG-LIST := [ FLAG-LIST ] FLAG\n");
 	fprintf(stderr, "FLAG  := [ permanent | dynamic | secondary | primary |\n");
-	fprintf(stderr, "           tentative | deprecated | dadfailed | temporary |\n");
+	fprintf(stderr, "           [-]tentative | [-]deprecated | [-]dadfailed | temporary |\n");
 	fprintf(stderr, "           CONFFLAG-LIST ]\n");
 	fprintf(stderr, "CONFFLAG-LIST := [ CONFFLAG-LIST ] CONFFLAG\n");
 	fprintf(stderr, "CONFFLAG  := [ home | nodad | mngtmpaddr | noprefixroute ]\n");
@@ -1261,9 +1261,15 @@ static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
 		} else if (strcmp(*argv, "tentative") == 0) {
 			filter.flags |= IFA_F_TENTATIVE;
 			filter.flagmask |= IFA_F_TENTATIVE;
+		} else if (strcmp(*argv, "-tentative") == 0) {
+			filter.flags &= ~IFA_F_TENTATIVE;
+			filter.flagmask |= IFA_F_TENTATIVE;
 		} else if (strcmp(*argv, "deprecated") == 0) {
 			filter.flags |= IFA_F_DEPRECATED;
 			filter.flagmask |= IFA_F_DEPRECATED;
+		} else if (strcmp(*argv, "-deprecated") == 0) {
+			filter.flags &= ~IFA_F_DEPRECATED;
+			filter.flagmask |= IFA_F_DEPRECATED;
 		} else if (strcmp(*argv, "home") == 0) {
 			filter.flags |= IFA_F_HOMEADDRESS;
 			filter.flagmask |= IFA_F_HOMEADDRESS;
@@ -1279,6 +1285,9 @@ static int ipaddr_list_flush_or_save(int argc, char **argv, int action)
 		} else if (strcmp(*argv, "dadfailed") == 0) {
 			filter.flags |= IFA_F_DADFAILED;
 			filter.flagmask |= IFA_F_DADFAILED;
+		} else if (strcmp(*argv, "-dadfailed") == 0) {
+			filter.flags &= ~IFA_F_DADFAILED;
+			filter.flagmask |= IFA_F_DADFAILED;
 		} else if (strcmp(*argv, "label") == 0) {
 			NEXT_ARG();
 			filter.label = *argv;
-- 
2.2.1