ipmonitor: Add nexthop option to monitor

Add capability to ip-monitor to listen and dump nexthop messages.
Since the nexthop group = 32 which exceeds the max groups bit
field, 2 separate flags are needed - one that defaults on to indicate
nexthop group is joined by default and a second that indicates a
specific selection by the user (e.g, ip mon nexthop route).

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Stephen Hemminger <stephen@networkplumber.org>

diff --git a/ip/ipmonitor.c b/ip/ipmonitor.c
index 9ecc7fd2011ac9a86634ac09126474ef2d844aac..685be52cfe64c527840f23a663db08afa9debb97 100644 (file)
--- a/ip/ipmonitor.c
+++ b/ip/ipmonitor.c
@@ -84,6 +84,12 @@ static int accept_msg(struct rtnl_ctrl_data *ctrl,
                }
        }
 
+       case RTM_NEWNEXTHOP:
+       case RTM_DELNEXTHOP:
+               print_headers(fp, "[NEXTHOP]", ctrl);
+               print_nexthop(n, arg);
+               return 0;
+
        case RTM_NEWLINK:
        case RTM_DELLINK:
                ll_remember_index(n, NULL);
@@ -161,6 +167,7 @@ static int accept_msg(struct rtnl_ctrl_data *ctrl,
 
 int do_ipmonitor(int argc, char **argv)
 {
+       int lnexthop = 0, nh_set = 1;
        char *file = NULL;
        unsigned int groups = 0;
        int llink = 0;
@@ -202,30 +209,42 @@ int do_ipmonitor(int argc, char **argv)
                } else if (matches(*argv, "link") == 0) {
                        llink = 1;
                        groups = 0;
+                       nh_set = 0;
                } else if (matches(*argv, "address") == 0) {
                        laddr = 1;
                        groups = 0;
+                       nh_set = 0;
                } else if (matches(*argv, "route") == 0) {
                        lroute = 1;
                        groups = 0;
+                       nh_set = 0;
                } else if (matches(*argv, "mroute") == 0) {
                        lmroute = 1;
                        groups = 0;
+                       nh_set = 0;
                } else if (matches(*argv, "prefix") == 0) {
                        lprefix = 1;
                        groups = 0;
+                       nh_set = 0;
                } else if (matches(*argv, "neigh") == 0) {
                        lneigh = 1;
                        groups = 0;
+                       nh_set = 0;
                } else if (matches(*argv, "netconf") == 0) {
                        lnetconf = 1;
                        groups = 0;
+                       nh_set = 0;
                } else if (matches(*argv, "rule") == 0) {
                        lrule = 1;
                        groups = 0;
+                       nh_set = 0;
                } else if (matches(*argv, "nsid") == 0) {
                        lnsid = 1;
                        groups = 0;
+                       nh_set = 0;
+               } else if (matches(*argv, "nexthop") == 0) {
+                       lnexthop = 1;
+                       groups = 0;
                } else if (strcmp(*argv, "all") == 0) {
                        prefix_banner = 1;
                } else if (matches(*argv, "all-nsid") == 0) {
@@ -297,6 +316,9 @@ int do_ipmonitor(int argc, char **argv)
        if (lnsid) {
                groups |= nl_mgrp(RTNLGRP_NSID);
        }
+       if (nh_set)
+               lnexthop = 1;
+
        if (file) {
                FILE *fp;
                int err;
@@ -313,6 +335,12 @@ int do_ipmonitor(int argc, char **argv)
 
        if (rtnl_open(&rth, groups) < 0)
                exit(1);
+
+       if (lnexthop && rtnl_add_nl_group(&rth, RTNLGRP_NEXTHOP) < 0) {
+               fprintf(stderr, "Failed to add nexthop group to list\n");
+               exit(1);
+       }
+
        if (listen_all_nsid && rtnl_listen_all_nsid(&rth) < 0)
                exit(1);