iproute2: make genl ctrl ls print multicast groups
From: Johannes Berg <johannes@sipsolutions.net>
Date: 2008-10-24 17:11:46
Subsystem:
the rest · Maintainer:
Linus Torvalds
This patch makes the genl tool print multicast groups, useful for discovering which multicast groups are supported. Signed-off-by: Johannes Berg <johannes@sipsolutions.net> --- genl/ctrl.c | 39 ++++++++++++++++++++++++++++++++++++--- include/linux/genetlink.h | 13 +++++++++++++ 2 files changed, 49 insertions(+), 3 deletions(-)
diff --git a/genl/ctrl.c b/genl/ctrl.c
index ee5acb8..5c02ee1 100644
--- a/genl/ctrl.c
+++ b/genl/ctrl.c@@ -23,6 +23,7 @@ #include "genl_utils.h" #define GENL_MAX_FAM_OPS 256 +#define GENL_MAX_FAM_MCAST 256 static int usage(void) { fprintf(stderr,"Usage: ctrl <CMD>\n" \
@@ -151,6 +152,24 @@ static int print_ctrl_cmds(FILE *fp, struct rtattr *arg, __u32 ctrl_ver) } +static int print_mcast_grp(FILE *fp, struct rtattr *arg) +{ + struct rtattr *tb[CTRL_ATTR_MCAST_GRP_MAX + 1]; + + if (!arg) + return -1; + + parse_rtattr_nested(tb, CTRL_ATTR_MCAST_GRP_MAX, arg); + if (tb[CTRL_ATTR_MCAST_GRP_NAME]) + fprintf(fp, "%s", (char *)RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_NAME])); + + if (tb[CTRL_ATTR_MCAST_GRP_ID]) { + __u32 *id = RTA_DATA(tb[CTRL_ATTR_MCAST_GRP_ID]); + fprintf(fp, " (%d)", *id); + } + return 0; +} + /* * The controller sends one nlmsg per family */
@@ -225,10 +244,24 @@ static int print_ctrl(const struct sockaddr_nl *who, struct nlmsghdr *n, fprintf(fp,"\n"); } } - - /* end of family::cmds definitions .. */ - fprintf(fp,"\n"); } + if (tb[CTRL_ATTR_MCAST_GROUPS]) { + struct rtattr *tb2[GENL_MAX_FAM_MCAST]; + int i=0; + parse_rtattr_nested(tb2, GENL_MAX_FAM_MCAST, tb[CTRL_ATTR_MCAST_GROUPS]); + fprintf(fp, "\tmulticast groups: \n"); + for (i = 0; i < GENL_MAX_FAM_MCAST; i++) { + if (tb2[i]) { + fprintf(fp, "\t\t- ", i); + if (0 > print_mcast_grp(fp, tb2[i])) + fprintf(fp, "Error printing command\n"); + /* for next command */ + fprintf(fp,"\n"); + } + } + } + fprintf(fp,"\n"); + fflush(fp); return 0; }
diff --git a/include/linux/genetlink.h b/include/linux/genetlink.h
index f7a9377..7da02c9 100644
--- a/include/linux/genetlink.h
+++ b/include/linux/genetlink.h@@ -39,6 +39,9 @@ enum { CTRL_CMD_NEWOPS, CTRL_CMD_DELOPS, CTRL_CMD_GETOPS, + CTRL_CMD_NEWMCAST_GRP, + CTRL_CMD_DELMCAST_GRP, + CTRL_CMD_GETMCAST_GRP, /* unused */ __CTRL_CMD_MAX, };
@@ -52,6 +55,7 @@ enum { CTRL_ATTR_HDRSIZE, CTRL_ATTR_MAXATTR, CTRL_ATTR_OPS, + CTRL_ATTR_MCAST_GROUPS, __CTRL_ATTR_MAX, };
@@ -66,4 +70,13 @@ enum { #define CTRL_ATTR_OP_MAX (__CTRL_ATTR_OP_MAX - 1) +enum { + CTRL_ATTR_MCAST_GRP_UNSPEC, + CTRL_ATTR_MCAST_GRP_NAME, + CTRL_ATTR_MCAST_GRP_ID, + __CTRL_ATTR_MCAST_GRP_MAX, +}; + +#define CTRL_ATTR_MCAST_GRP_MAX (__CTRL_ATTR_MCAST_GRP_MAX - 1) + #endif /* __LINUX_GENERIC_NETLINK_H */