iplink: support for WWAN devices

The WWAN subsystem has been extended to generalize the per data channel
network interfaces management. This change implements support for WWAN
links handling. And actively uses the earlier introduced ip-link
capability to specify the parent by its device name.

The WWAN interface for a new data channel should be created with a
command like this:

ip link add dev wwan0-2 parentdev wwan0 type wwan linkid 2

Where: wwan0 is the modem HW device name (should be taken from
/sys/class/wwan) and linkid is an identifier of the opened data
channel.

Signed-off-by: Sergey Ryazanov <ryazanov.s.a@gmail.com>
Signed-off-by: David Ahern <dsahern@kernel.org>

diff --git a/ip/Makefile b/ip/Makefile
index 4cad619cb3be1043d81846e7197342cb26af6686..b03af29b22108c8cd4ee9cc48fba12de42fdee4c 100644 (file)
--- a/ip/Makefile
+++ b/ip/Makefile
@@ -11,7 +11,7 @@ IPOBJ=ip.o ipaddress.o ipaddrlabel.o iproute.o iprule.o ipnetns.o \
     iplink_bridge.o iplink_bridge_slave.o ipfou.o iplink_ipvlan.o \
     iplink_geneve.o iplink_vrf.o iproute_lwtunnel.o ipmacsec.o ipila.o \
     ipvrf.o iplink_xstats.o ipseg6.o iplink_netdevsim.o iplink_rmnet.o \
-    ipnexthop.o ipmptcp.o iplink_bareudp.o
+    ipnexthop.o ipmptcp.o iplink_bareudp.o iplink_wwan.o
 
 RTMONOBJ=rtmon.o
 

diff --git a/ip/iplink.c b/ip/iplink.c
index 33b7be301434edd9eb10868dddf2c115490adacc..18b2ea25b7c2bb85aa15fe197d21b7b6a97ec8d2 100644 (file)
--- a/ip/iplink.c
+++ b/ip/iplink.c
@@ -56,7 +56,8 @@ void iplink_types_usage(void)
                "          ipip | ipoib | ipvlan | ipvtap |\n"
                "          macsec | macvlan | macvtap |\n"
                "          netdevsim | nlmon | rmnet | sit | team | team_slave |\n"
-               "          vcan | veth | vlan | vrf | vti | vxcan | vxlan | xfrm }\n");
+               "          vcan | veth | vlan | vrf | vti | vxcan | vxlan | wwan |\n"
+               "          xfrm }\n");
 }
 
 void iplink_usage(void)

diff --git a/ip/iplink_wwan.c b/ip/iplink_wwan.c
new file mode 100644 (file)
index 0000000..3510477
--- /dev/null
+++ b/ip/iplink_wwan.c
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#include <stdio.h>
+#include <linux/netlink.h>
+#include <linux/wwan.h>
+
+#include "utils.h"
+#include "ip_common.h"
+
+static void print_explain(FILE *f)
+{
+       fprintf(f,
+               "Usage: ... wwan linkid LINKID\n"
+               "\n"
+               "Where: LINKID := 0-4294967295\n"
+       );
+}
+
+static void explain(void)
+{
+       print_explain(stderr);
+}
+
+static int wwan_parse_opt(struct link_util *lu, int argc, char **argv,
+                         struct nlmsghdr *n)
+{
+       while (argc > 0) {
+               if (matches(*argv, "linkid") == 0) {
+                       __u32 linkid;
+
+                       NEXT_ARG();
+                       if (get_u32(&linkid, *argv, 0))
+                               invarg("linkid", *argv);
+                       addattr32(n, 1024, IFLA_WWAN_LINK_ID, linkid);
+               } else if (matches(*argv, "help") == 0) {
+                       explain();
+                       return -1;
+               } else {
+                       fprintf(stderr, "wwan: unknown command \"%s\"?\n",
+                               *argv);
+                       explain();
+                       return -1;
+               }
+               argc--, argv++;
+       }
+
+       return 0;
+}
+
+static void wwan_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
+{
+       if (!tb)
+               return;
+
+       if (tb[IFLA_WWAN_LINK_ID])
+               print_uint(PRINT_ANY, "linkid", "linkid %u ",
+                          rta_getattr_u32(tb[IFLA_WWAN_LINK_ID]));
+}
+
+static void wwan_print_help(struct link_util *lu, int argc, char **argv,
+                           FILE *f)
+{
+       print_explain(f);
+}
+
+struct link_util wwan_link_util = {
+       .id             = "wwan",
+       .maxattr        = IFLA_WWAN_MAX,
+       .parse_opt      = wwan_parse_opt,
+       .print_opt      = wwan_print_opt,
+       .print_help     = wwan_print_help,
+};