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Message-Id: <1569646104-358-2-git-send-email-roopa@cumulusnetworks.com>
Date: Fri, 27 Sep 2019 21:48:23 -0700
From: Roopa Prabhu <roopa@...ulusnetworks.com>
To: dsahern@...il.com
Cc: netdev@...r.kernel.org, nikolay@...ulusnetworks.com,
stephen@...workplumber.org
Subject: [PATCH iproute2 net-next 1/2] bridge: fdb get support
From: Roopa Prabhu <roopa@...ulusnetworks.com>
This patch adds support to lookup a bridge fdb entry
using recently added support in the kernel using RTM_GETNEIGH
(and AF_BRIDGE family).
example:
$bridge fdb get 02:02:00:00:00:03 dev test-dummy0 vlan 1002
02:02:00:00:00:03 dev test-dummy0 vlan 1002 master bridge
Signed-off-by: Roopa Prabhu <roopa@...ulusnetworks.com>
---
bridge/fdb.c | 113 +++++++++++++++++++++++++++++++++++++++++++++++++++++-
man/man8/bridge.8 | 40 +++++++++++++++++++
2 files changed, 152 insertions(+), 1 deletion(-)
diff --git a/bridge/fdb.c b/bridge/fdb.c
index 941ce2d..a0229cd 100644
--- a/bridge/fdb.c
+++ b/bridge/fdb.c
@@ -40,7 +40,9 @@ static void usage(void)
" [ sticky ] [ local | static | dynamic ] [ dst IPADDR ]\n"
" [ vlan VID ] [ port PORT] [ vni VNI ] [ via DEV ]\n"
" [ src_vni VNI ]\n"
- " bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ] [ state STATE ] ]\n");
+ " bridge fdb [ show [ br BRDEV ] [ brport DEV ] [ vlan VID ] [ state STATE ] ]\n"
+ " bridge fdb get ADDR [ br BRDEV ] { brport |dev } DEV [ vlan VID ]\n"
+ " [ vni VNI ]\n");
exit(-1);
}
@@ -518,6 +520,113 @@ static int fdb_modify(int cmd, int flags, int argc, char **argv)
return 0;
}
+static int fdb_get(int argc, char **argv)
+{
+ struct {
+ struct nlmsghdr n;
+ struct ndmsg ndm;
+ char buf[1024];
+ } req = {
+ .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)),
+ .n.nlmsg_flags = NLM_F_REQUEST,
+ .n.nlmsg_type = RTM_GETNEIGH,
+ .ndm.ndm_family = AF_BRIDGE,
+ };
+ struct nlmsghdr *answer;
+ char *addr = NULL;
+ char *d = NULL, *br = NULL;
+ char abuf[ETH_ALEN];
+ unsigned long vni = ~0;
+ int br_ifindex = 0;
+ char *endptr;
+ short vlan = -1;
+
+ while (argc > 0) {
+ if ((strcmp(*argv, "brport") == 0) || strcmp(*argv, "dev") == 0) {
+ NEXT_ARG();
+ d = *argv;
+ } else if (strcmp(*argv, "br") == 0) {
+ NEXT_ARG();
+ br = *argv;
+ } else if (strcmp(*argv, "dev") == 0) {
+ NEXT_ARG();
+ d = *argv;
+ } else if (strcmp(*argv, "vni") == 0) {
+ NEXT_ARG();
+ vni = strtoul(*argv, &endptr, 0);
+ if ((endptr && *endptr) ||
+ (vni >> 24) || vni == ULONG_MAX)
+ invarg("invalid VNI\n", *argv);
+ } else if (strcmp(*argv, "self") == 0) {
+ req.ndm.ndm_flags |= NTF_SELF;
+ } else if (matches(*argv, "master") == 0) {
+ req.ndm.ndm_flags |= NTF_MASTER;
+ } else if (matches(*argv, "vlan") == 0) {
+ if (vlan >= 0)
+ duparg2("vlan", *argv);
+ NEXT_ARG();
+ vlan = atoi(*argv);
+ } else {
+ if (strcmp(*argv, "to") == 0)
+ NEXT_ARG();
+
+ if (matches(*argv, "help") == 0)
+ usage();
+ if (addr)
+ duparg2("to", *argv);
+ addr = *argv;
+ }
+ argc--; argv++;
+ }
+
+ if ((d == NULL && br == NULL) || addr == NULL) {
+ fprintf(stderr, "Device or master and address are required arguments.\n");
+ return -1;
+ }
+
+ if (sscanf(addr, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
+ abuf, abuf+1, abuf+2,
+ abuf+3, abuf+4, abuf+5) != 6) {
+ fprintf(stderr, "Invalid mac address %s\n", addr);
+ return -1;
+ }
+
+ addattr_l(&req.n, sizeof(req), NDA_LLADDR, abuf, ETH_ALEN);
+
+ if (vlan >= 0)
+ addattr16(&req.n, sizeof(req), NDA_VLAN, vlan);
+
+ if (vni != ~0)
+ addattr32(&req.n, sizeof(req), NDA_VNI, vni);
+
+ if (d) {
+ req.ndm.ndm_ifindex = ll_name_to_index(d);
+ if (!req.ndm.ndm_ifindex) {
+ fprintf(stderr, "Cannot find device \"%s\"\n", d);
+ return -1;
+ }
+ }
+
+ if (br) {
+ br_ifindex = ll_name_to_index(br);
+ if (!br_ifindex) {
+ fprintf(stderr, "Cannot find bridge device \"%s\"\n", br);
+ return -1;
+ }
+ addattr32(&req.n, sizeof(req), NDA_MASTER, br_ifindex);
+ }
+
+ if (rtnl_talk(&rth, &req.n, &answer) < 0)
+ return -2;
+
+ if (print_fdb(answer, (void *)stdout) < 0) {
+ fprintf(stderr, "An error :-)\n");
+ return -1;
+ }
+
+ return 0;
+}
+
int do_fdb(int argc, char **argv)
{
ll_init_map(&rth);
@@ -531,6 +640,8 @@ int do_fdb(int argc, char **argv)
return fdb_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
if (matches(*argv, "delete") == 0)
return fdb_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
+ if (matches(*argv, "get") == 0)
+ return fdb_get(argc-1, argv+1);
if (matches(*argv, "show") == 0 ||
matches(*argv, "lst") == 0 ||
matches(*argv, "list") == 0)
diff --git a/man/man8/bridge.8 b/man/man8/bridge.8
index bb4fb52..10f6cf0 100644
--- a/man/man8/bridge.8
+++ b/man/man8/bridge.8
@@ -93,6 +93,17 @@ bridge \- show / manipulate bridge addresses and devices
.IR STATE " ]"
.ti -8
+.B bridge fdb get
+.I LLADDR " [ "
+.B dev
+.IR DEV " ] [ "
+.B br
+.IR BRDEV " ] [ "
+.B vlan
+.IR VID " ] ["
+.BR self " ] [ " master " ]"
+
+.ti -8
.BR "bridge mdb" " { " add " | " del " } "
.B dev
.IR DEV
@@ -550,6 +561,35 @@ With the
option, the command becomes verbose. It prints out the last updated
and last used time for each entry.
+.SS bridge fdb get - get bridge forwarding entry.
+
+lookup a bridge forwarding table entry.
+
+.TP
+.BI "LLADDR"
+the Ethernet MAC address.
+
+.TP
+.BI dev " DEV"
+the interface to which this address is associated.
+
+.TP
+.BI brport " DEV"
+the bridge port to which this address is associated. same as dev above.
+
+.TP
+.BI br " DEV"
+the bridge to which this address is associated.
+
+.TP
+.B self
+- the address is associated with the port drivers fdb. Usually hardware.
+
+.TP
+.B master
+- the address is associated with master devices fdb. Usually software (default).
+.sp
+
.SH bridge mdb - multicast group database management
.B mdb
--
2.1.4
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