/*
* arp responses from vhostX need to be cross connected. nothing
* needs to be done for arp responses from VMs, while responses
* from fabric needs to be Xconnected and sent to agent
*/
static int
vr_handle_arp_reply(struct vr_arp *sarp, struct vr_packet *pkt,
struct vr_forwarding_md *fmd)
{
struct vr_interface *vif = pkt->vp_if;
struct vr_packet *cloned_pkt;
if (vif_mode_xconnect(vif) || vif->vif_type == VIF_TYPE_HOST)
return vif_xconnect(vif, pkt, fmd);
if (vif->vif_type != VIF_TYPE_PHYSICAL) {
if (vif_is_virtual(vif)) {
vr_preset(pkt);
return vr_trap(pkt, fmd->fmd_dvrf, AGENT_TRAP_ARP, NULL);
}
vr_pfree(pkt, VP_DROP_INVALID_IF);
return 0;
}
cloned_pkt = vr_pclone(pkt);
if (cloned_pkt) {
vr_preset(cloned_pkt);
vif_xconnect(vif, cloned_pkt, fmd);
}
return vr_trap(pkt, fmd->fmd_dvrf, AGENT_TRAP_ARP, NULL);
}
/* vhost driver */
static int
vhost_rx(struct vr_interface *vif, struct vr_packet *pkt,
unsigned short vlan_id __attribute__((unused)))
{
struct vr_interface_stats *stats = vif_get_stats(vif, pkt->vp_cpu);
stats->vis_ibytes += pkt_len(pkt);
stats->vis_ipackets++;
/* please see the text on xconnect mode */
if (vif_mode_xconnect(vif))
return vif_xconnect(vif, pkt);
return vr_input(vif->vif_vrf, vif, pkt);
}
static int
eth_rx(struct vr_interface *vif, struct vr_packet *pkt, unsigned short vlan_id)
{
struct vr_interface_stats *stats = vif_get_stats(vif, pkt->vp_cpu);
stats->vis_ibytes += pkt_len(pkt);
stats->vis_ipackets++;
/*
* please see the text on xconnect mode
*
* since we would like the packets to reach the VMs (if they were
* destined to in the first place), packets have to traverse the
* stack. so, just mark a flag suggesting that packet is destined
* for the vrouter and force the vrouter to receive the packet
*/
if (vif_mode_xconnect(vif))
pkt->vp_flags |= VP_FLAG_TO_ME;
return vr_interface_input(vif->vif_vrf, vif, pkt, vlan_id);
}
/*
* arp responses from vhostX need to be cross connected. nothing
* needs to be done for arp responses from VMs, while responses
* from fabric needs to be Xconnected and sent to agent
*/
static int
vr_handle_arp_reply(struct vrouter *router, unsigned short vrf,
struct vr_arp *sarp, struct vr_packet *pkt)
{
struct vr_interface *vif = pkt->vp_if;
struct vr_packet *cloned_pkt;
if (vif_mode_xconnect(vif) || vif->vif_type == VIF_TYPE_HOST)
return vif_xconnect(vif, pkt);
if (vif->vif_type != VIF_TYPE_PHYSICAL) {
vr_pfree(pkt, VP_DROP_INVALID_IF);
return 0;
}
cloned_pkt = vr_pclone(pkt);
if (cloned_pkt) {
vr_preset(cloned_pkt);
vif_xconnect(vif, cloned_pkt);
}
return vr_trap(pkt, vrf, AGENT_TRAP_ARP, NULL);
}
static int
vr_handle_arp_request(struct vrouter *router, unsigned short vrf,
struct vr_arp *sarp, struct vr_packet *pkt)
{
struct vr_packet *cloned_pkt;
struct vr_interface *vif = pkt->vp_if;
unsigned short proto = htons(VR_ETH_PROTO_ARP);
struct vr_eth *eth;
struct vr_arp *arp;
unsigned int dpa;
bool should_proxy = false;
/*
* still @ l2 level, and hence we can use the mode of the interface
* to figure out whether we need to xconnect or not. in the xconnect
* mode, just pass it to the peer so that he can handle the arp requests
*/
if (vif_mode_xconnect(vif))
return vif_xconnect(vif, pkt);
should_proxy = vr_should_proxy(vif, sarp->arp_dpa, sarp->arp_spa);
/*
* if vr should not proxy, all the other arp requests should go out on
* the physical interface
*/
if (vif->vif_type == VIF_TYPE_HOST && !should_proxy)
return vif_xconnect(vif, pkt);
/*
* grat arp from
*
* VMs - need to be dropped
* Fabric - need to be xconnected and also sent to agent
* Vhost - xconnected above
*/
if (vr_grat_arp(sarp)) {
if (vif->vif_type == VIF_TYPE_VIRTUAL) {
vr_pfree(pkt, VP_DROP_GARP_FROM_VM);
return 0;
}
cloned_pkt = vr_pclone(pkt);
if (cloned_pkt) {
vr_preset(cloned_pkt);
vif_xconnect(vif, cloned_pkt);
}
return vr_trap(pkt, vrf, AGENT_TRAP_ARP, NULL);
}
if (should_proxy) {
pkt_reset(pkt);
eth = (struct vr_eth *)pkt_data(pkt);
memcpy(eth->eth_dmac, sarp->arp_sha, VR_ETHER_ALEN);
memcpy(eth->eth_smac, vif->vif_mac, VR_ETHER_ALEN);
memcpy(ð->eth_proto, &proto, sizeof(proto));
arp = (struct vr_arp *)pkt_pull_tail(pkt, VR_ETHER_HLEN);
sarp->arp_op = htons(VR_ARP_OP_REPLY);
memcpy(sarp->arp_sha, vif->vif_mac, VR_ETHER_ALEN);
memcpy(sarp->arp_dha, eth->eth_dmac, VR_ETHER_ALEN);
dpa = sarp->arp_dpa;
memcpy(&sarp->arp_dpa, &sarp->arp_spa, sizeof(sarp->arp_dpa));
memcpy(&sarp->arp_spa, &dpa, sizeof(sarp->arp_spa));
memcpy(arp, sarp, sizeof(*sarp));
pkt_pull_tail(pkt, sizeof(*arp));
vif->vif_tx(vif, pkt);
} else {
/* requests for which vr doesn't have to do anything */
vr_pfree(pkt, VP_DROP_INVALID_ARP);
}
return 0;
}
