ip/iplink_rmnet.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * iplink_rmnet.c       RMNET device support
   4  *
   5  * Authors:     Daniele Palmas <dnlplm@gmail.com>
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11
  12 #include "utils.h"
  13 #include "ip_common.h"
  14
  15 static void print_explain(FILE *f)
  16 {
  17         fprintf(f,
  18                 "Usage: ... rmnet mux_id MUXID\n"
  19                 "\n"
  20                 "MUXID := 1-254\n"
  21         );
  22 }
  23
  24 static void explain(void)
  25 {
  26         print_explain(stderr);
  27 }
  28
  29 static int rmnet_parse_opt(struct link_util *lu, int argc, char **argv,
  30                            struct nlmsghdr *n)
  31 {
  32         __u16 mux_id;
  33
  34         while (argc > 0) {
  35                 if (matches(*argv, "mux_id") == 0) {
  36                         NEXT_ARG();
  37                         if (get_u16(&mux_id, *argv, 0))
  38                                 invarg("mux_id is invalid", *argv);
  39                         addattr16(n, 1024, IFLA_RMNET_MUX_ID, mux_id);
  40                 } else if (matches(*argv, "help") == 0) {
  41                         explain();
  42                         return -1;
  43                 } else {
  44                         fprintf(stderr, "rmnet: unknown command \"%s\"?\n", *argv);
  45                         explain();
  46                         return -1;
  47                 }
  48                 argc--, argv++;
  49         }
  50
  51         return 0;
  52 }
  53
  54 static void rmnet_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
  55 {
  56         if (!tb)
  57                 return;
  58
  59         if (!tb[IFLA_RMNET_MUX_ID] ||
  60             RTA_PAYLOAD(tb[IFLA_RMNET_MUX_ID]) < sizeof(__u16))
  61                 return;
  62
  63         print_uint(PRINT_ANY,
  64                    "mux_id",
  65                    "mux_id %u ",
  66                    rta_getattr_u16(tb[IFLA_RMNET_MUX_ID]));
  67 }
  68
  69 static void rmnet_print_help(struct link_util *lu, int argc, char **argv,
  70                              FILE *f)
  71 {
  72         print_explain(f);
  73 }
  74
  75 struct link_util rmnet_link_util = {
  76         .id             = "rmnet",
  77         .maxattr        = IFLA_RMNET_MAX,
  78         .parse_opt      = rmnet_parse_opt,
  79         .print_opt      = rmnet_print_opt,
  80         .print_help     = rmnet_print_help,
  81 };