src/network/netdev/macvlan.c

   1 /* SPDX-License-Identifier: LGPL-2.1-or-later */
   2
   3 #include <linux/if_arp.h>
   4
   5 #include "sd-netlink.h"
   6
   7 #include "conf-parser.h"
   8 #include "macvlan.h"
   9 #include "macvlan-util.h"
  10 #include "networkd-link.h"
  11 #include "networkd-network.h"
  12 #include "parse-util.h"
  13 #include "set.h"
  14 #include "string-util.h"
  15
  16 typedef enum BCQueueThreshold {
  17         BC_QUEUE_THRESHOLD_UNDEF   = INT32_MIN,
  18         BC_QUEUE_THRESHOLD_DISABLE = -1,
  19 } BCQueueThreshold;
  20
  21 DEFINE_CONFIG_PARSE_ENUM(config_parse_macvlan_mode, macvlan_mode, MacVlanMode);
  22
  23 static int netdev_macvlan_fill_message_create(NetDev *netdev, Link *link, sd_netlink_message *req) {
  24         assert(netdev);
  25         assert(netdev->ifname);
  26         assert(link);
  27         assert(link->network);
  28
  29         MacVlan *m = netdev->kind == NETDEV_KIND_MACVLAN ? MACVLAN(netdev) : MACVTAP(netdev);
  30         int r;
  31
  32         if (m->mode == NETDEV_MACVLAN_MODE_SOURCE && !set_isempty(m->match_source_mac)) {
  33                 const struct ether_addr *mac_addr;
  34
  35                 r = sd_netlink_message_append_u32(req, IFLA_MACVLAN_MACADDR_MODE, MACVLAN_MACADDR_SET);
  36                 if (r < 0)
  37                         return r;
  38
  39                 r = sd_netlink_message_open_container(req, IFLA_MACVLAN_MACADDR_DATA);
  40                 if (r < 0)
  41                         return r;
  42
  43                 SET_FOREACH(mac_addr, m->match_source_mac) {
  44                         r = sd_netlink_message_append_ether_addr(req, IFLA_MACVLAN_MACADDR, mac_addr);
  45                         if (r < 0)
  46                                 return r;
  47                 }
  48
  49                 r = sd_netlink_message_close_container(req);
  50                 if (r < 0)
  51                         return r;
  52         }
  53
  54         if (m->mode != _NETDEV_MACVLAN_MODE_INVALID) {
  55                 r = sd_netlink_message_append_u32(req, IFLA_MACVLAN_MODE, m->mode);
  56                 if (r < 0)
  57                         return r;
  58         }
  59
  60         /* set the nopromisc flag if Promiscuous= of the link is explicitly set to false */
  61         if (m->mode == NETDEV_MACVLAN_MODE_PASSTHRU && link->network->promiscuous == 0) {
  62                 r = sd_netlink_message_append_u16(req, IFLA_MACVLAN_FLAGS, MACVLAN_FLAG_NOPROMISC);
  63                 if (r < 0)
  64                         return r;
  65         }
  66
  67         if (m->bc_queue_length != UINT32_MAX) {
  68                 r = sd_netlink_message_append_u32(req, IFLA_MACVLAN_BC_QUEUE_LEN, m->bc_queue_length);
  69                 if (r < 0)
  70                         return r;
  71         }
  72
  73         if (m->bc_queue_threshold != BC_QUEUE_THRESHOLD_UNDEF) {
  74                 r = sd_netlink_message_append_s32(req, IFLA_MACVLAN_BC_CUTOFF, m->bc_queue_threshold);
  75                 if (r < 0)
  76                         return r;
  77         }
  78
  79         return 0;
  80 }
  81
  82 int config_parse_macvlan_broadcast_queue_size(
  83                 const char *unit,
  84                 const char *filename,
  85                 unsigned line,
  86                 const char *section,
  87                 unsigned section_line,
  88                 const char *lvalue,
  89                 int ltype,
  90                 const char *rvalue,
  91                 void *data,
  92                 void *userdata) {
  93
  94         assert(filename);
  95         assert(section);
  96         assert(lvalue);
  97         assert(rvalue);
  98         assert(data);
  99
 100         MacVlan *m = ASSERT_PTR(userdata);
 101
 102         if (isempty(rvalue)) {
 103                 m->bc_queue_length = UINT32_MAX;
 104                 return 0;
 105         }
 106
 107         return config_parse_uint32_bounded(
 108                         unit, filename, line, section, section_line, lvalue, rvalue,
 109                         0, UINT32_MAX - 1, true,
 110                         &m->bc_queue_length);
 111 }
 112
 113 int config_parse_macvlan_broadcast_queue_threshold(
 114                 const char *unit,
 115                 const char *filename,
 116                 unsigned line,
 117                 const char *section,
 118                 unsigned section_line,
 119                 const char *lvalue,
 120                 int ltype,
 121                 const char *rvalue,
 122                 void *data,
 123                 void *userdata) {
 124
 125         assert(filename);
 126         assert(lvalue);
 127         assert(rvalue);
 128
 129         int32_t v, *threshold = ASSERT_PTR(data);
 130         int r;
 131
 132         if (isempty(rvalue)) {
 133                 *threshold = BC_QUEUE_THRESHOLD_UNDEF;
 134                 return 0;
 135         }
 136
 137         if (streq(rvalue, "no")) {
 138                 *threshold = BC_QUEUE_THRESHOLD_DISABLE;
 139                 return 0;
 140         }
 141
 142         r = safe_atoi32(rvalue, &v);
 143         if (r < 0) {
 144                 log_syntax(unit, LOG_WARNING, filename, line, r,
 145                            "Failed to parse %s=, ignoring assignment: %s",
 146                            lvalue, rvalue);
 147                 return 0;
 148         }
 149         if (v < 0) {
 150                 log_syntax(unit, LOG_WARNING, filename, line, 0,
 151                            "Invalid %s= value specified, ignoring assignment: %s",
 152                            lvalue, rvalue);
 153                 return 0;
 154         }
 155
 156         *threshold = v;
 157         return 0;
 158 }
 159
 160 static void macvlan_done(NetDev *netdev) {
 161         MacVlan *m = ASSERT_PTR(netdev)->kind == NETDEV_KIND_MACVLAN ? MACVLAN(netdev) : MACVTAP(netdev);
 162
 163         set_free(m->match_source_mac);
 164 }
 165
 166 static void macvlan_init(NetDev *netdev) {
 167         MacVlan *m = ASSERT_PTR(netdev)->kind == NETDEV_KIND_MACVLAN ? MACVLAN(netdev) : MACVTAP(netdev);
 168
 169         m->mode = _NETDEV_MACVLAN_MODE_INVALID;
 170         m->bc_queue_length = UINT32_MAX;
 171         m->bc_queue_threshold = BC_QUEUE_THRESHOLD_UNDEF;
 172 }
 173
 174 const NetDevVTable macvtap_vtable = {
 175         .object_size = sizeof(MacVlan),
 176         .init = macvlan_init,
 177         .done = macvlan_done,
 178         .sections = NETDEV_COMMON_SECTIONS "MACVTAP\0",
 179         .fill_message_create = netdev_macvlan_fill_message_create,
 180         .create_type = NETDEV_CREATE_STACKED,
 181         .iftype = ARPHRD_ETHER,
 182         .generate_mac = true,
 183         .keep_existing = true,
 184 };
 185
 186 const NetDevVTable macvlan_vtable = {
 187         .object_size = sizeof(MacVlan),
 188         .init = macvlan_init,
 189         .done = macvlan_done,
 190         .sections = NETDEV_COMMON_SECTIONS "MACVLAN\0",
 191         .fill_message_create = netdev_macvlan_fill_message_create,
 192         .create_type = NETDEV_CREATE_STACKED,
 193         .iftype = ARPHRD_ETHER,
 194         .generate_mac = true,
 195         .keep_existing = true,
 196 };