vport-netdev.c 4.7 KB

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  1. // SPDX-License-Identifier: GPL-2.0-only
  2. /*
  3. * Copyright (c) 2007-2012 Nicira, Inc.
  4. */
  5. #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  6. #include <linux/if_arp.h>
  7. #include <linux/if_bridge.h>
  8. #include <linux/if_vlan.h>
  9. #include <linux/kernel.h>
  10. #include <linux/llc.h>
  11. #include <linux/rtnetlink.h>
  12. #include <linux/skbuff.h>
  13. #include <linux/openvswitch.h>
  14. #include <linux/export.h>
  15. #include <net/ip_tunnels.h>
  16. #include <net/rtnetlink.h>
  17. #include "datapath.h"
  18. #include "vport.h"
  19. #include "vport-internal_dev.h"
  20. #include "vport-netdev.h"
  21. static struct vport_ops ovs_netdev_vport_ops;
  22. /* Must be called with rcu_read_lock. */
  23. static void netdev_port_receive(struct sk_buff *skb)
  24. {
  25. struct vport *vport;
  26. vport = ovs_netdev_get_vport(skb->dev);
  27. if (unlikely(!vport))
  28. goto error;
  29. if (unlikely(skb_warn_if_lro(skb)))
  30. goto error;
  31. /* Make our own copy of the packet. Otherwise we will mangle the
  32. * packet for anyone who came before us (e.g. tcpdump via AF_PACKET).
  33. */
  34. skb = skb_share_check(skb, GFP_ATOMIC);
  35. if (unlikely(!skb))
  36. return;
  37. if (skb->dev->type == ARPHRD_ETHER) {
  38. skb_push(skb, ETH_HLEN);
  39. skb_postpush_rcsum(skb, skb->data, ETH_HLEN);
  40. }
  41. ovs_vport_receive(vport, skb, skb_tunnel_info(skb));
  42. return;
  43. error:
  44. kfree_skb(skb);
  45. }
  46. /* Called with rcu_read_lock and bottom-halves disabled. */
  47. static rx_handler_result_t netdev_frame_hook(struct sk_buff **pskb)
  48. {
  49. struct sk_buff *skb = *pskb;
  50. if (unlikely(skb->pkt_type == PACKET_LOOPBACK))
  51. return RX_HANDLER_PASS;
  52. netdev_port_receive(skb);
  53. return RX_HANDLER_CONSUMED;
  54. }
  55. static struct net_device *get_dpdev(const struct datapath *dp)
  56. {
  57. struct vport *local;
  58. local = ovs_vport_ovsl(dp, OVSP_LOCAL);
  59. return local->dev;
  60. }
  61. struct vport *ovs_netdev_link(struct vport *vport, const char *name)
  62. {
  63. int err;
  64. vport->dev = dev_get_by_name(ovs_dp_get_net(vport->dp), name);
  65. if (!vport->dev) {
  66. err = -ENODEV;
  67. goto error_free_vport;
  68. }
  69. if (vport->dev->flags & IFF_LOOPBACK ||
  70. (vport->dev->type != ARPHRD_ETHER &&
  71. vport->dev->type != ARPHRD_NONE) ||
  72. ovs_is_internal_dev(vport->dev)) {
  73. err = -EINVAL;
  74. goto error_put;
  75. }
  76. rtnl_lock();
  77. err = netdev_master_upper_dev_link(vport->dev,
  78. get_dpdev(vport->dp),
  79. NULL, NULL, NULL);
  80. if (err)
  81. goto error_unlock;
  82. err = netdev_rx_handler_register(vport->dev, netdev_frame_hook,
  83. vport);
  84. if (err)
  85. goto error_master_upper_dev_unlink;
  86. dev_disable_lro(vport->dev);
  87. dev_set_promiscuity(vport->dev, 1);
  88. vport->dev->priv_flags |= IFF_OVS_DATAPATH;
  89. rtnl_unlock();
  90. return vport;
  91. error_master_upper_dev_unlink:
  92. netdev_upper_dev_unlink(vport->dev, get_dpdev(vport->dp));
  93. error_unlock:
  94. rtnl_unlock();
  95. error_put:
  96. dev_put(vport->dev);
  97. error_free_vport:
  98. ovs_vport_free(vport);
  99. return ERR_PTR(err);
  100. }
  101. EXPORT_SYMBOL_GPL(ovs_netdev_link);
  102. static struct vport *netdev_create(const struct vport_parms *parms)
  103. {
  104. struct vport *vport;
  105. vport = ovs_vport_alloc(0, &ovs_netdev_vport_ops, parms);
  106. if (IS_ERR(vport))
  107. return vport;
  108. return ovs_netdev_link(vport, parms->name);
  109. }
  110. static void vport_netdev_free(struct rcu_head *rcu)
  111. {
  112. struct vport *vport = container_of(rcu, struct vport, rcu);
  113. if (vport->dev)
  114. dev_put(vport->dev);
  115. ovs_vport_free(vport);
  116. }
  117. void ovs_netdev_detach_dev(struct vport *vport)
  118. {
  119. ASSERT_RTNL();
  120. vport->dev->priv_flags &= ~IFF_OVS_DATAPATH;
  121. netdev_rx_handler_unregister(vport->dev);
  122. netdev_upper_dev_unlink(vport->dev,
  123. netdev_master_upper_dev_get(vport->dev));
  124. dev_set_promiscuity(vport->dev, -1);
  125. }
  126. static void netdev_destroy(struct vport *vport)
  127. {
  128. rtnl_lock();
  129. if (netif_is_ovs_port(vport->dev))
  130. ovs_netdev_detach_dev(vport);
  131. rtnl_unlock();
  132. call_rcu(&vport->rcu, vport_netdev_free);
  133. }
  134. void ovs_netdev_tunnel_destroy(struct vport *vport)
  135. {
  136. rtnl_lock();
  137. if (netif_is_ovs_port(vport->dev))
  138. ovs_netdev_detach_dev(vport);
  139. /* We can be invoked by both explicit vport deletion and
  140. * underlying netdev deregistration; delete the link only
  141. * if it's not already shutting down.
  142. */
  143. if (vport->dev->reg_state == NETREG_REGISTERED)
  144. rtnl_delete_link(vport->dev);
  145. dev_put(vport->dev);
  146. vport->dev = NULL;
  147. rtnl_unlock();
  148. call_rcu(&vport->rcu, vport_netdev_free);
  149. }
  150. EXPORT_SYMBOL_GPL(ovs_netdev_tunnel_destroy);
  151. /* Returns null if this device is not attached to a datapath. */
  152. struct vport *ovs_netdev_get_vport(struct net_device *dev)
  153. {
  154. if (likely(netif_is_ovs_port(dev)))
  155. return (struct vport *)
  156. rcu_dereference_rtnl(dev->rx_handler_data);
  157. else
  158. return NULL;
  159. }
  160. static struct vport_ops ovs_netdev_vport_ops = {
  161. .type = OVS_VPORT_TYPE_NETDEV,
  162. .create = netdev_create,
  163. .destroy = netdev_destroy,
  164. .send = dev_queue_xmit,
  165. };
  166. int __init ovs_netdev_init(void)
  167. {
  168. return ovs_vport_ops_register(&ovs_netdev_vport_ops);
  169. }
  170. void ovs_netdev_exit(void)
  171. {
  172. ovs_vport_ops_unregister(&ovs_netdev_vport_ops);
  173. }