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

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