static struct pkt0_packet *
alloc_pkt0_packet(struct vr_packet *vrp)
{
struct pkt0_packet *packet;
unsigned int pkt_size = pkt_len(vrp);
int ret;
packet = ExAllocatePoolWithTag(NonPagedPoolNx, sizeof(struct pkt0_packet), pkt0_allocation_tag);
if (packet == NULL)
return NULL;
RtlZeroMemory(packet, sizeof(*packet));
packet->buffer = ExAllocatePoolWithTag(NonPagedPoolNx, pkt_size, pkt0_allocation_tag);
if (packet->buffer == NULL)
goto failure;
RtlZeroMemory(packet->buffer, pkt_size);
ret = vr_pcopy(packet->buffer, vrp, vrp->vp_data, pkt_size);
if (ret != pkt_size) {
goto failure;
}
packet->length = ret;
return packet;
failure:
if (packet)
free_pkt0_packet(packet);
return NULL;
}
struct vr_packet *
pkt_copy(struct vr_packet *pkt, unsigned short off, unsigned short len)
{
struct vr_packet *pkt_c;
unsigned short head_space;
/*
* one eth header for agent, and one more for packets from
* tun interfaces
*/
head_space = (2 * sizeof(struct vr_eth)) + sizeof(struct agent_hdr);
pkt_c = vr_palloc(head_space + len);
if (!pkt_c)
return pkt_c;
pkt_c->vp_data += head_space;
pkt_c->vp_tail += head_space;
if (vr_pcopy(pkt_data(pkt_c), pkt, off, len) < 0) {
vr_pfree(pkt_c, VP_DROP_MISC);
return NULL;
}
pkt_pull_tail(pkt_c, len);
pkt_c->vp_if = pkt->vp_if;
pkt_c->vp_flags = pkt->vp_flags;
pkt_c->vp_cpu = pkt->vp_cpu;
pkt_c->vp_network_h = 0;
return pkt_c;
}