ip/link_xfrm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * link_xfrm.c  Virtual XFRM Interface driver module
   4  *
   5  * Authors:     Matt Ellison <matt@arroyo.io>
   6  */
   7
   8 #include <string.h>
   9 #include <linux/if_link.h>
  10
  11 #include "rt_names.h"
  12 #include "utils.h"
  13 #include "ip_common.h"
  14 #include "tunnel.h"
  15
  16 static void xfrm_print_help(struct link_util *lu, int argc, char **argv,
  17                             FILE *f)
  18 {
  19         fprintf(f,
  20                 "Usage: ... %-4s dev PHYS_DEV [ if_id IF-ID ]\n"
  21                 "\n"
  22                 "Where: IF-ID := { 0x0..0xffffffff }\n",
  23                 lu->id);
  24 }
  25
  26 static int xfrm_parse_opt(struct link_util *lu, int argc, char **argv,
  27                           struct nlmsghdr *n)
  28 {
  29         unsigned int link = 0;
  30         __u32 if_id = 0;
  31
  32         while (argc > 0) {
  33                 if (!matches(*argv, "dev")) {
  34                         NEXT_ARG();
  35                         link = ll_name_to_index(*argv);
  36                         if (!link)
  37                                 exit(nodev(*argv));
  38                 } else if (!matches(*argv, "if_id")) {
  39                         NEXT_ARG();
  40                         if (!get_u32(&if_id, *argv, 0))
  41                                 addattr32(n, 1024, IFLA_XFRM_IF_ID, if_id);
  42                 } else {
  43                         xfrm_print_help(lu, argc, argv, stderr);
  44                         return -1;
  45                 }
  46                 argc--; argv++;
  47         }
  48
  49         if (link) {
  50                 addattr32(n, 1024, IFLA_XFRM_LINK, link);
  51         } else {
  52                 fprintf(stderr, "must specify physical device\n");
  53                 return -1;
  54         }
  55
  56         return 0;
  57 }
  58
  59 static void xfrm_print_opt(struct link_util *lu, FILE *f, struct rtattr *tb[])
  60 {
  61
  62         if (!tb)
  63                 return;
  64
  65         if (tb[IFLA_XFRM_IF_ID]) {
  66                 __u32 id = rta_getattr_u32(tb[IFLA_XFRM_IF_ID]);
  67
  68                 print_0xhex(PRINT_ANY, "if_id", "if_id %#llx ", id);
  69
  70         }
  71
  72 }
  73
  74 struct link_util xfrm_link_util = {
  75         .id = "xfrm",
  76         .maxattr = IFLA_XFRM_MAX,
  77         .parse_opt = xfrm_parse_opt,
  78         .print_opt = xfrm_print_opt,
  79         .print_help = xfrm_print_help,
  80 };