L2 mode
xmit packet
xmit a normal pkt to other phy machine
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| ==> ipvlan_start_xmit
==> ==> ipvlan_xmit_mode_l2
==> ==> ==> skb->dev = ipvlan->phy_dev;
==> ==> ==> return dev_queue_xmit(skb);
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xmit a normal pkt to other namespace
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| ==> ipvlan_start_xmit
==> ==> ipvlan_xmit_mode_l2
==> ==> ==> if (ether_addr_equal(eth->h_dest, eth->h_source))
==> ==> ==> addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
==> ==> ==> ipvlan_rcv_frame(addr, skb, true);
==> ==> ==> ==> skb->dev = dev; <== dst namespace dev
==> ==> ==> ==> dev_forward_skb(ipvlan->dev, skb)
==> ==> ==> ==> ==> return __dev_forward_skb(dev, skb) ?: netif_rx_internal(skb);
==> ==> ==> ==> ==> ==> enqueue_to_backlog(skb, get_cpu(), &qtail);
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xmit a mutlicast pkt
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| ==> ipvlan_start_xmit
==> ==> ipvlan_xmit_mode_l2
==> ==> ==> else if (is_multicast_ether_addr(eth->h_dest))
==> ==> ==> ipvlan_multicast_frame(ipvlan->port, skb, ipvlan, true);
==> ==> ==> ==> list_for_each_entry(ipvlan, &port->ipvlans, pnode)
==> ==> ==> ==> ==> dev_forward_skb or netif_rx(nskb);
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recv packet
All the packet are get by the rx_handler, ipvlan_handle_frame.
unicast packet
lookup the dest ipvlan port(net_device)
by the dst IPv4/6 address, and send to it.
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| ==> ipvlan_handle_frame
==> ==> ipvlan_handle_mode_l2
==> ==> ==> ipvlan_addr_lookup(port, lyr3h, addr_type, true);
==> ==> ==> ==> skb->dev = dev;
==> ==> ==> ==> dev_forward_skb or ret = RX_HANDLER_ANOTHER;
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multicast packet.
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| ==> ipvlan_handle_frame
==> ==> ipvlan_handle_mode_l2
==> ==> ==> if (is_multicast_ether_addr(eth->h_dest)) {
==> ==> ==> ipvlan_addr_lookup(port, lyr3h, addr_type, true);
==> ==> ==> ==> if (ipvlan_external_frame(skb, port))
==> ==> ==> ==> ==> ipvlan_multicast_frame(port, skb, NULL, false);
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l3 mode
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| 308 static const struct net_device_ops ipvlan_netdev_ops = {
309 .ndo_init = ipvlan_init,
310 .ndo_uninit = ipvlan_uninit,
311 .ndo_open = ipvlan_open,
312 .ndo_stop = ipvlan_stop,
313 .ndo_start_xmit = ipvlan_start_xmit,
314 .ndo_fix_features = ipvlan_fix_features,
315 .ndo_change_rx_flags = ipvlan_change_rx_flags,
316 .ndo_set_rx_mode = ipvlan_set_multicast_mac_filter,
317 .ndo_get_stats64 = ipvlan_get_stats64,
318 .ndo_vlan_rx_add_vid = ipvlan_vlan_rx_add_vid,
319 .ndo_vlan_rx_kill_vid = ipvlan_vlan_rx_kill_vid,
320 };
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| 495 int ipvlan_queue_xmit(struct sk_buff *skb, struct net_device *dev)
496 {
497 struct ipvl_dev *ipvlan = netdev_priv(dev);
498 struct ipvl_port *port = ipvlan_port_get_rcu(ipvlan->phy_dev);
499
500 if (!port)
501 goto out;
502
503 if (unlikely(!pskb_may_pull(skb, sizeof(struct ethhdr))))
504 goto out;
505
506 switch(port->mode) {
507 case IPVLAN_MODE_L2:
508 return ipvlan_xmit_mode_l2(skb, dev);
509 case IPVLAN_MODE_L3:
510 return ipvlan_xmit_mode_l3(skb, dev);
511 }
512
513
514 WARN_ONCE(true, "ipvlan_queue_xmit() called for mode = [%hx]\n",
515 port->mode);
516 out:
517 kfree_skb(skb);
518 return NET_XMIT_DROP;
519 }
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| 457 static int ipvlan_xmit_mode_l2(struct sk_buff *skb, struct net_device *dev)
458 {
459 const struct ipvl_dev *ipvlan = netdev_priv(dev);
460 struct ethhdr *eth = eth_hdr(skb);
461 struct ipvl_addr *addr;
462 void *lyr3h;
463 int addr_type;
464
465 if (ether_addr_equal(eth->h_dest, eth->h_source)) {
466 lyr3h = ipvlan_get_L3_hdr(skb, &addr_type);
467 if (lyr3h) {
468 addr = ipvlan_addr_lookup(ipvlan->port, lyr3h, addr_type, true);
469 if (addr)
470 return ipvlan_rcv_frame(addr, skb, true);
471 }
472 skb = skb_share_check(skb, GFP_ATOMIC);
473 if (!skb)
474 return NET_XMIT_DROP;
475
476
481 return dev_forward_skb(ipvlan->phy_dev, skb);
482
483 } else if (is_multicast_ether_addr(eth->h_dest)) {
484 u8 ip_summed = skb->ip_summed;
485
486 skb->ip_summed = CHECKSUM_UNNECESSARY;
487 ipvlan_multicast_frame(ipvlan->port, skb, ipvlan, true);
488 skb->ip_summed = ip_summed;
489 }
490
491 skb->dev = ipvlan->phy_dev;
492 return dev_queue_xmit(skb);
493 }
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