src/libsystemd/sd-netlink/netlink-util.c

   1 /* SPDX-License-Identifier: LGPL-2.1+ */
   2 /***
   3  This file is part of systemd.
   4
   5  Copyright (C) 2013 Tom Gundersen <teg@jklm.no>
   6
   7   systemd is free software; you can redistribute it and/or modify it
   8   under the terms of the GNU Lesser General Public License as published by
   9   the Free Software Foundation; either version 2.1 of the License, or
  10   (at your option) any later version.
  11
  12   systemd is distributed in the hope that it will be useful, but
  13   WITHOUT ANY WARRANTY; without even the implied warranty of
  14   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  15   Lesser General Public License for more details.
  16
  17   You should have received a copy of the GNU Lesser General Public License
  18   along with systemd; If not, see <http://www.gnu.org/licenses/>.
  19 ***/
  20
  21 #include "sd-netlink.h"
  22
  23 #include "netlink-internal.h"
  24 #include "netlink-util.h"
  25
  26 int rtnl_set_link_name(sd_netlink **rtnl, int ifindex, const char *name) {
  27         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
  28         int r;
  29
  30         assert(rtnl);
  31         assert(ifindex > 0);
  32         assert(name);
  33
  34         if (!*rtnl) {
  35                 r = sd_netlink_open(rtnl);
  36                 if (r < 0)
  37                         return r;
  38         }
  39
  40         r = sd_rtnl_message_new_link(*rtnl, &message, RTM_SETLINK, ifindex);
  41         if (r < 0)
  42                 return r;
  43
  44         r = sd_netlink_message_append_string(message, IFLA_IFNAME, name);
  45         if (r < 0)
  46                 return r;
  47
  48         r = sd_netlink_call(*rtnl, message, 0, NULL);
  49         if (r < 0)
  50                 return r;
  51
  52         return 0;
  53 }
  54
  55 int rtnl_set_link_properties(sd_netlink **rtnl, int ifindex, const char *alias,
  56                              const struct ether_addr *mac, unsigned mtu) {
  57         _cleanup_(sd_netlink_message_unrefp) sd_netlink_message *message = NULL;
  58         int r;
  59
  60         assert(rtnl);
  61         assert(ifindex > 0);
  62
  63         if (!alias && !mac && mtu == 0)
  64                 return 0;
  65
  66         if (!*rtnl) {
  67                 r = sd_netlink_open(rtnl);
  68                 if (r < 0)
  69                         return r;
  70         }
  71
  72         r = sd_rtnl_message_new_link(*rtnl, &message, RTM_SETLINK, ifindex);
  73         if (r < 0)
  74                 return r;
  75
  76         if (alias) {
  77                 r = sd_netlink_message_append_string(message, IFLA_IFALIAS, alias);
  78                 if (r < 0)
  79                         return r;
  80         }
  81
  82         if (mac) {
  83                 r = sd_netlink_message_append_ether_addr(message, IFLA_ADDRESS, mac);
  84                 if (r < 0)
  85                         return r;
  86         }
  87
  88         if (mtu > 0) {
  89                 r = sd_netlink_message_append_u32(message, IFLA_MTU, mtu);
  90                 if (r < 0)
  91                         return r;
  92         }
  93
  94         r = sd_netlink_call(*rtnl, message, 0, NULL);
  95         if (r < 0)
  96                 return r;
  97
  98         return 0;
  99 }
 100
 101 int rtnl_message_new_synthetic_error(int error, uint32_t serial, sd_netlink_message **ret) {
 102         struct nlmsgerr *err;
 103         int r;
 104
 105         assert(error <= 0);
 106
 107         r = message_new(NULL, ret, NLMSG_ERROR);
 108         if (r < 0)
 109                 return r;
 110
 111         (*ret)->hdr->nlmsg_seq = serial;
 112
 113         err = NLMSG_DATA((*ret)->hdr);
 114
 115         err->error = error;
 116
 117         return 0;
 118 }
 119
 120 int rtnl_log_parse_error(int r) {
 121         return log_error_errno(r, "Failed to parse netlink message: %m");
 122 }
 123
 124 int rtnl_log_create_error(int r) {
 125         return log_error_errno(r, "Failed to create netlink message: %m");
 126 }