static int
linux_if_rx(struct vr_interface *vif, struct vr_packet *pkt)
{
int rc;
struct net_device *dev = (struct net_device *)vif->vif_os;
struct sk_buff *skb = vp_os_packet(pkt);
struct vr_ip *ip;
unsigned short network_off, transport_off, cksum_off = 0;
skb->data = pkt->vp_head + pkt->vp_data;
skb->len = pkt_len(pkt);
skb_set_tail_pointer(skb, pkt_head_len(pkt));
if (!dev) {
kfree_skb(skb);
goto exit_rx;
}
(void)__sync_fetch_and_add(&dev->stats.rx_bytes, skb->len);
(void)__sync_fetch_and_add(&dev->stats.rx_packets, 1);
/* this is only needed for mirroring */
if ((pkt->vp_flags & VP_FLAG_FROM_DP) &&
(pkt->vp_flags & VP_FLAG_CSUM_PARTIAL)) {
network_off = pkt_get_network_header_off(pkt);
ip = (struct vr_ip *)(pkt_data_at_offset(pkt, network_off));
transport_off = network_off + (ip->ip_hl * 4);
if (ip->ip_proto == VR_IP_PROTO_TCP)
cksum_off = offsetof(struct vr_tcp, tcp_csum);
else if (ip->ip_proto == VR_IP_PROTO_UDP)
/*
* This funciton parses the ethernet packet and assigns the
* pkt->vp_type, network protocol of the packet. The ethernet header can
* start from an offset from vp_data
*/
int
vr_pkt_type(struct vr_packet *pkt, unsigned short offset,
struct vr_forwarding_md *fmd)
{
unsigned char *eth = pkt_data(pkt) + offset;
unsigned short eth_proto;
int pull_len, pkt_len = pkt_head_len(pkt) - offset;
struct vr_vlan_hdr *vlan;
pull_len = VR_ETHER_HLEN;
if (pkt_len < pull_len)
return -1;
pkt->vp_flags &= ~(VP_FLAG_MULTICAST);
/* L2 broadcast/multicast packets are multicast packets */
if (IS_MAC_BMCAST(eth))
pkt->vp_flags |= VP_FLAG_MULTICAST;
eth_proto = ntohs(*(unsigned short *)(eth + VR_ETHER_PROTO_OFF));
while (eth_proto == VR_ETH_PROTO_VLAN) {
if (pkt_len < (pull_len + sizeof(*vlan)))
return -1;
vlan = (struct vr_vlan_hdr *)(eth + pull_len);
if (fmd && (fmd->fmd_vlan == VLAN_ID_INVALID))
fmd->fmd_vlan = vlan->vlan_tag & 0xFFF;
eth_proto = ntohs(vlan->vlan_proto);
pull_len += sizeof(*vlan);
}
pkt_set_network_header(pkt, pkt->vp_data + offset + pull_len);
pkt_set_inner_network_header(pkt, pkt->vp_data + offset + pull_len);
pkt->vp_type = vr_eth_proto_to_pkt_type(eth_proto);
return 0;
}
