ip: Add HSR support

Add basic support for High-Availability Seamless Redundancy (HSR) network
devices.
Signed-off-by: Arvid Brodin <arvid.brodin@alten.se>

ip/Makefile

@@ -5,7 +5,7 @@ IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \
     iplink_vlan.o link_veth.o link_gre.o iplink_can.o \
     iplink_macvlan.o iplink_macvtap.o ipl2tp.o link_vti.o \
     iplink_vxlan.o tcp_metrics.o iplink_ipoib.o ipnetconf.o link_ip6tnl.o \
-    link_iptnl.o link_gre6.o iplink_bond.o
+    link_iptnl.o link_gre6.o iplink_bond.o iplink_hsr.o
 
 RTMONOBJ=rtmon.o
 

ip/iplink_hsr.c

+/*
+ * iplink_hsr.c	HSR device support
+ *
+ *		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; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Authors:	Arvid Brodin <arvid.brodin@alten.se>
+ *
+ *		Based on iplink_vlan.c by Patrick McHardy <kaber@trash.net>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>  /* Needed by linux/if.h for some reason */
+#include <linux/if.h>
+#include <linux/if_arp.h>
+#include "rt_names.h"
+#include "utils.h"
+#include "ip_common.h"
+
+static void usage(void)
+{
+	fprintf(stderr,
+"Usage:\tip link add name NAME type hsr slave1 SLAVE1-IF slave2 SLAVE2-IF\n"
+"\t[ supervision ADDR-BYTE ]\n"
+"\n"
+"NAME\n"
+"	name of new hsr device (e.g. hsr0)\n"
+"SLAVE1-IF, SLAVE2-IF\n"
+"	the two slave devices bound to the HSR device\n"
+"ADDR-BYTE\n"
+"	0-255; the last byte of the multicast address used for HSR supervision\n"
+"	frames (default = 0)\n");
+}
+
+static int hsr_parse_opt(struct link_util *lu, int argc, char **argv,
+			 struct nlmsghdr *n)
+{
+	int ifindex;
+	unsigned char multicast_spec;
+
+	while (argc > 0) {
+		if (matches(*argv, "supervision") == 0) {
+			NEXT_ARG();
+			if (get_u8(&multicast_spec, *argv, 0))
+				invarg("ADDR-BYTE is invalid", *argv);
+			addattr_l(n, 1024, IFLA_HSR_MULTICAST_SPEC,
+				  &multicast_spec, 1);
+		} else if (matches(*argv, "slave1") == 0) {
+			NEXT_ARG();
+			ifindex = ll_name_to_index(*argv);
+			if (ifindex == 0)
+				invarg("No such interface", *argv);
+			addattr_l(n, 1024, IFLA_HSR_SLAVE1, &ifindex, 4);
+		} else if (matches(*argv, "slave2") == 0) {
+			NEXT_ARG();
+			ifindex = ll_name_to_index(*argv);
+			if (ifindex == 0)
+				invarg("No such interface", *argv);
+			addattr_l(n, 1024, IFLA_HSR_SLAVE2, &ifindex, 4);
+		} else if (matches(*argv, "help") == 0) {
+			usage();
+			return -1;
+		} else {
+			fprintf(stderr, "hsr: what is \"%s\"?\n", *argv);
+			usage();
+			return -1;
+		}
+		argc--, argv++;
+	}
+
+	return 0;
+}
+
+static void hsr_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
+{
+	SPRINT_BUF(b1);
+
+	if (!tb)
+		return;
+
+	if (tb[IFLA_HSR_SLAVE1] &&
+	    RTA_PAYLOAD(tb[IFLA_HSR_SLAVE1]) < sizeof(__u32))
+		return;
+	if (tb[IFLA_HSR_SLAVE2] &&
+	    RTA_PAYLOAD(tb[IFLA_HSR_SLAVE2]) < sizeof(__u32))
+		return;
+	if (tb[IFLA_HSR_SEQ_NR] &&
+	    RTA_PAYLOAD(tb[IFLA_HSR_SEQ_NR]) < sizeof(__u16))
+		return;
+	if (tb[IFLA_HSR_SUPERVISION_ADDR] &&
+	    RTA_PAYLOAD(tb[IFLA_HSR_SUPERVISION_ADDR]) < ETH_ALEN)
+		return;
+
+	fprintf(f, "slave1 ");
+	if (tb[IFLA_HSR_SLAVE1])
+		fprintf(f, "%s ",
+			ll_index_to_name(rta_getattr_u32(tb[IFLA_HSR_SLAVE1])));
+	else
+		fprintf(f, "<none> ");
+
+	fprintf(f, "slave2 ");
+	if (tb[IFLA_HSR_SLAVE2])
+		fprintf(f, "%s ",
+			ll_index_to_name(rta_getattr_u32(tb[IFLA_HSR_SLAVE2])));
+	else
+		fprintf(f, "<none> ");
+
+	if (tb[IFLA_HSR_SEQ_NR])
+		fprintf(f, "sequence %d ",
+			rta_getattr_u16(tb[IFLA_HSR_SEQ_NR]));
+
+	if (tb[IFLA_HSR_SUPERVISION_ADDR])
+		fprintf(f, "supervision %s ",
+			ll_addr_n2a(RTA_DATA(tb[IFLA_HSR_SUPERVISION_ADDR]),
+				    RTA_PAYLOAD(tb[IFLA_HSR_SUPERVISION_ADDR]),
+				    ARPHRD_VOID,
+				    b1, sizeof(b1)));
+}
+
+struct link_util hsr_link_util = {
+	.id		= "hsr",
+	.maxattr	= IFLA_VLAN_MAX,
+	.parse_opt	= hsr_parse_opt,
+	.print_opt	= hsr_print_opt,
+};

man/man8/ip-link.8.in

@@ -54,6 +54,7 @@ ip-link \- network device configuration
 .BR bond " ]"
 .BR can " | "
 .BR dummy " | "
+.BR hsr " | "
 .BR ifb " | "
 .BR ipoib " |"
 .BR macvlan  " | "