The ip_route_get command is used to retrieve the network
device used to reach a given IP address. This is useful
for informational purposes and also for the network boot
which wants to get the linux.bootargs parameter of the
network device used for nfsroot.
Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
commands/Kconfig | 10 ++++++
commands/Makefile | 1 +
commands/ip-route-get.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 107 insertions(+)
create mode 100644 commands/ip-route-get.c
diff --git a/commands/Kconfig b/commands/Kconfig
index ae2dc4b094..eee4b6aee8 100644
--- a/commands/Kconfig
+++ b/commands/Kconfig
@@ -1200,6 +1200,16 @@ config CMD_TFTP
Options:
-p push to TFTP server
+config CMD_IP_ROUTE_GET
+ tristate
+ prompt "ip-route-get"
+ default y
+ help
+ The ip-route-get command is used to retrieve the network interface
+ which is used to reach the specified IP address. Information can
+ be shown on the command line or alternatively a variable is set to
+ the result.
+
# end Network commands
endmenu
diff --git a/commands/Makefile b/commands/Makefile
index 582175f631..eb4796389e 100644
--- a/commands/Makefile
+++ b/commands/Makefile
@@ -122,3 +122,4 @@ obj-$(CONFIG_CMD_SPD_DECODE) += spd_decode.o
obj-$(CONFIG_CMD_MMC_EXTCSD) += mmc_extcsd.o
obj-$(CONFIG_CMD_NAND_BITFLIP) += nand-bitflip.o
obj-$(CONFIG_CMD_SEED) += seed.o
+obj-$(CONFIG_CMD_IP_ROUTE_GET) += ip-route-get.o
diff --git a/commands/ip-route-get.c b/commands/ip-route-get.c
new file mode 100644
index 0000000000..d393218188
--- /dev/null
+++ b/commands/ip-route-get.c
@@ -0,0 +1,96 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; version 2.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ */
+
+#include <command.h>
+#include <common.h>
+#include <getopt.h>
+#include <complete.h>
+#include <environment.h>
+#include <net.h>
+
+static int do_ip_route_get(int argc, char *argv[])
+{
+ struct eth_device *edev;
+ IPaddr_t ip, gw = 0;
+ const char *variable = NULL;
+ int opt, ret;
+ bool bootarg = false;
+
+ while ((opt = getopt(argc, argv, "b")) > 0) {
+ switch (opt) {
+ case 'b':
+ bootarg = true;
+ break;
+ default:
+ return COMMAND_ERROR_USAGE;
+ }
+ }
+
+ if (argc == optind)
+ return COMMAND_ERROR_USAGE;
+
+ if (argc == optind + 2)
+ variable = argv[optind + 1];
+
+ ret = string_to_ip(argv[optind], &ip);
+ if (ret) {
+ printf("Cannot convert %s into a IP address: %s\n",
+ argv[1], strerror(-ret));
+ return 1;
+ }
+
+ edev = net_route(ip);
+ if (!edev) {
+ gw = net_get_gateway();
+ if (gw)
+ edev = net_route(gw);
+ }
+
+ if (!edev) {
+ printf("IP %pI4 is not reachable\n", &ip);
+ return 1;
+ }
+
+ if (variable) {
+ if (bootarg)
+ setenv(variable, edev->bootarg);
+ else
+ setenv(variable, edev->devname);
+ return 0;
+ }
+
+ if (bootarg) {
+ printf("%s\n", edev->bootarg);
+ } else {
+ if (gw)
+ printf("%pI4 via %pI4 dev %s\n", &ip, &gw,
+ edev->devname);
+ else
+ printf("%pI4 dev %s\n", &ip, edev->devname);
+ }
+
+ return 0;
+}
+
+BAREBOX_CMD_HELP_START(ip_route_get)
+BAREBOX_CMD_HELP_TEXT("get ethernet device used to reach given IP address")
+BAREBOX_CMD_HELP_TEXT("")
+BAREBOX_CMD_HELP_TEXT("Options:")
+BAREBOX_CMD_HELP_OPT("-b", "Instead of ethernet device, show linux bootargs for that device")
+BAREBOX_CMD_HELP_END
+
+BAREBOX_CMD_START(ip_route_get)
+ .cmd = do_ip_route_get,
+ BAREBOX_CMD_DESC("get ethernet device name for an IP address")
+ BAREBOX_CMD_OPTS("[-b] <IP> [variable]")
+ BAREBOX_CMD_GROUP(CMD_GRP_MISC)
+ BAREBOX_CMD_COMPLETE(empty_complete)
+BAREBOX_CMD_END
--
2.11.0
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