Sample output:
# ./bridge/bridge mdb
bridge dev br0
multicast database:
port no 1, multicast addr 224.8.8.9
port no 2, multicast addr 224.8.8.8
router ports: 2
TODO: display device name too
Cc: Herbert Xu <[email protected]>
Cc: Stephen Hemminger <[email protected]>
Cc: "David S. Miller" <[email protected]>
Cc: Thomas Graf <[email protected]>
Cc: Jesper Dangaard Brouer <[email protected]>
Signed-off-by: Cong Wang <[email protected]>
---
bridge/Makefile | 2 +-
bridge/br_common.h | 35 ++++++++++
bridge/bridge.c | 1 +
bridge/mdb.c | 157 +++++++++++++++++++++++++++++++++++++++++++++
include/linux/rtnetlink.h | 3 +
5 files changed, 197 insertions(+), 1 deletions(-)
diff --git a/bridge/Makefile b/bridge/Makefile
index 9a6743e..67aceb4 100644
--- a/bridge/Makefile
+++ b/bridge/Makefile
@@ -1,4 +1,4 @@
-BROBJ = bridge.o fdb.o monitor.o link.o
+BROBJ = bridge.o fdb.o monitor.o link.o mdb.o
include ../Config
diff --git a/bridge/br_common.h b/bridge/br_common.h
index 718ecb9..83b2b9f 100644
--- a/bridge/br_common.h
+++ b/bridge/br_common.h
@@ -5,6 +5,7 @@ extern int print_fdb(const struct sockaddr_nl *who,
struct nlmsghdr *n, void *arg);
extern int do_fdb(int argc, char **argv);
+extern int do_mdb(int argc, char **argv);
extern int do_monitor(int argc, char **argv);
extern int preferred_family;
@@ -12,3 +13,37 @@ extern int show_stats;
extern int show_detail;
extern int timestamp;
extern struct rtnl_handle rth;
+
+/* Bridge multicast database attributes
+ * [MDBA_MDB] = {
+ * [MDBA_MCADDR]
+ * [MDBA_BRPORT_NO]
+ * }
+ * [MDBA_ROUTER] = {
+ * [MDBA_BRPORT_NO]
+ * }
+ */
+enum {
+ MDBA_UNSPEC,
+ MDBA_MDB,
+ MDBA_ROUTER,
+ __MDBA_MAX,
+};
+#define MDBA_MAX (__MDBA_MAX - 1)
+
+enum {
+ MDBA_MDB_UNSPEC,
+ MDBA_MCADDR,
+ MDBA_BRPORT_NO,
+ __MDBA_MDB_MAX,
+};
+#define MDBA_MDB_MAX (__MDBA_MDB_MAX - 1)
+
+struct br_port_msg {
+ int ifindex;
+};
+
+#ifndef MDBA_RTA
+#define MDBA_RTA(r) \
+ ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct
br_port_msg))))
+#endif
diff --git a/bridge/bridge.c b/bridge/bridge.c
index e2c33b0..1fcd365 100644
--- a/bridge/bridge.c
+++ b/bridge/bridge.c
@@ -43,6 +43,7 @@ static const struct cmd {
int (*func)(int argc, char **argv);
} cmds[] = {
{ "fdb", do_fdb },
+ { "mdb", do_mdb },
{ "monitor", do_monitor },
{ "help", do_help },
{ 0 }
diff --git a/bridge/mdb.c b/bridge/mdb.c
new file mode 100644
index 0000000..f2f4ff2
--- /dev/null
+++ b/bridge/mdb.c
@@ -0,0 +1,157 @@
+/*
+ * Get mdb table with netlink
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <time.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/time.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <linux/if_bridge.h>
+#include <linux/if_ether.h>
+#include <linux/neighbour.h>
+#include <string.h>
+#include <arpa/inet.h>
+
+#include "libnetlink.h"
+#include "br_common.h"
+#include "rt_names.h"
+#include "utils.h"
+
+int filter_index;
+
+static void usage(void)
+{
+ fprintf(stderr, " bridge mdb {show} [ dev DEV ]\n");
+ exit(-1);
+}
+
+static void br_print_router_ports(FILE *f, struct rtattr *attr)
+{
+ uint16_t *port_no;
+ struct rtattr *i;
+ int rem;
+
+ fprintf(f, "router ports: ");
+
+ rem = RTA_PAYLOAD(attr);
+ for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
+ port_no = RTA_DATA(i);
+ fprintf(f, "%u ", *port_no);
+ }
+ fprintf(f, "\n");
+}
+
+static void br_print_mdb_entry(FILE *f, struct rtattr *attr)
+{
+ uint32_t addr;
+ uint16_t port_no;
+ struct rtattr *i;
+ int rem;
+ SPRINT_BUF(abuf);
+
+ fprintf(f, "multicast database:\n");
+
+ rem = RTA_PAYLOAD(attr);
+ for (i = RTA_DATA(attr); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
+ port_no = rta_getattr_u16(i);
+ i = RTA_NEXT(i, rem);
+ addr = rta_getattr_u32(i);
+ fprintf(f, "port no %u, multicast addr %s\n", port_no,
inet_ntop(AF_INET, &addr, abuf, sizeof(abuf)));
+ }
+}
+
+int print_mdb(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
+{
+ FILE *fp = arg;
+ struct br_port_msg *r = NLMSG_DATA(n);
+ int len = n->nlmsg_len;
+ struct rtattr * tb[MDBA_MAX+1];
+
+ if (n->nlmsg_type != RTM_GETMDB) {
+ fprintf(stderr, "Not RTM_MDB: %08x %08x %08x\n",
+ n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
+
+ return 0;
+ }
+
+ len -= NLMSG_LENGTH(sizeof(*r));
+ if (len < 0) {
+ fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
+ return -1;
+ }
+
+ if (filter_index && filter_index != r->ifindex)
+ return 0;
+
+ if (!filter_index && r->ifindex)
+ fprintf(fp, "bridge dev %s\n", ll_index_to_name(r->ifindex));
+
+ parse_rtattr(tb, MDBA_MAX, MDBA_RTA(r), n->nlmsg_len -
NLMSG_LENGTH(sizeof(*r)));
+
+ if (tb[MDBA_MDB])
+ br_print_mdb_entry(fp, tb[MDBA_MDB]);
+
+ if (tb[MDBA_ROUTER])
+ br_print_router_ports(fp, tb[MDBA_ROUTER]);
+
+ return 0;
+}
+
+static int mdb_show(int argc, char **argv)
+{
+ char *filter_dev = NULL;
+
+ while (argc > 0) {
+ if (strcmp(*argv, "dev") == 0) {
+ NEXT_ARG();
+ if (filter_dev)
+ duparg("dev", *argv);
+ filter_dev = *argv;
+ }
+ argc--; argv++;
+ }
+
+ if (filter_dev) {
+ filter_index = if_nametoindex(filter_dev);
+ if (filter_index == 0) {
+ fprintf(stderr, "Cannot find device \"%s\"\n",
+ filter_dev);
+ return -1;
+ }
+ }
+
+ if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETMDB) < 0) {
+ perror("Cannot send dump request");
+ exit(1);
+ }
+
+ if (rtnl_dump_filter(&rth, print_mdb, stdout) < 0) {
+ fprintf(stderr, "Dump terminated\n");
+ exit(1);
+ }
+
+ return 0;
+}
+
+int do_mdb(int argc, char **argv)
+{
+ ll_init_map(&rth);
+
+ if (argc > 0) {
+ if (matches(*argv, "show") == 0 ||
+ matches(*argv, "lst") == 0 ||
+ matches(*argv, "list") == 0)
+ return mdb_show(argc-1, argv+1);
+ if (matches(*argv, "help") == 0)
+ usage();
+ } else
+ return mdb_show(0, NULL);
+
+ fprintf(stderr, "Command \"%s\" is unknown, try \"bridge mdb
help\".\n", *argv);
+ exit(-1);
+}
diff --git a/include/linux/rtnetlink.h b/include/linux/rtnetlink.h
index 0e3e0c1..f400b5e 100644
--- a/include/linux/rtnetlink.h
+++ b/include/linux/rtnetlink.h
@@ -120,6 +120,9 @@ enum {
RTM_SETDCB,
#define RTM_SETDCB RTM_SETDCB
+ RTM_GETMDB = 86,
+#define RTM_GETMDB RTM_GETMDB
+
__RTM_MAX,
#define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1)
};
