int qrtr_endpoint_post(struct qrtr_endpoint *ep, const void *data, size_t len)
{
	struct qrtr_node *node = ep->node;
	const struct qrtr_hdr_v1 *v1;
	const struct qrtr_hdr_v2 *v2;
	struct qrtr_sock *ipc;
	struct sk_buff *skb;
	struct qrtr_cb *cb;
	unsigned int size;
	unsigned int ver;
	size_t hdrlen;

	if (len == 0 || len & 3)
		return -EINVAL;

	skb = __netdev_alloc_skb(NULL, len, GFP_ATOMIC | __GFP_NOWARN);
	if (!skb)
		return -ENOMEM;

	cb = (struct qrtr_cb *)skb->cb;

	/* Version field in v1 is little endian, so this works for both cases */
	ver = *(u8*)data;

	switch (ver) {
	case QRTR_PROTO_VER_1:
		if (len < sizeof(*v1))
			goto err;
		v1 = data;
		hdrlen = sizeof(*v1);

		cb->type = le32_to_cpu(v1->type);
		cb->src_node = le32_to_cpu(v1->src_node_id);
		cb->src_port = le32_to_cpu(v1->src_port_id);
		cb->confirm_rx = !!v1->confirm_rx;
		cb->dst_node = le32_to_cpu(v1->dst_node_id);
		cb->dst_port = le32_to_cpu(v1->dst_port_id);

		size = le32_to_cpu(v1->size);
		break;
	case QRTR_PROTO_VER_2:
		if (len < sizeof(*v2))
			goto err;
		v2 = data;
		hdrlen = sizeof(*v2) + v2->optlen;

		cb->type = v2->type;
		cb->confirm_rx = !!(v2->flags & QRTR_FLAGS_CONFIRM_RX);
		cb->src_node = le16_to_cpu(v2->src_node_id);
		cb->src_port = le16_to_cpu(v2->src_port_id);
		cb->dst_node = le16_to_cpu(v2->dst_node_id);
		cb->dst_port = le16_to_cpu(v2->dst_port_id);

		if (cb->src_port == (u16)QRTR_PORT_CTRL)
			cb->src_port = QRTR_PORT_CTRL;
		if (cb->dst_port == (u16)QRTR_PORT_CTRL)
			cb->dst_port = QRTR_PORT_CTRL;

		size = le32_to_cpu(v2->size);
		break;
	default:
		pr_err("qrtr: Invalid version %d\n", ver);
		goto err;
	}

	if (len != ALIGN(size, 4) + hdrlen)
		goto err;

	if (cb->dst_port != QRTR_PORT_CTRL && cb->type != QRTR_TYPE_DATA &&
	    cb->type != QRTR_TYPE_RESUME_TX)
		goto err;

	skb_put_data(skb, data + hdrlen, size);

	qrtr_node_assign(node, cb->src_node);

	if (cb->type == QRTR_TYPE_NEW_SERVER) {
		/* Remote node endpoint can bridge other distant nodes */
		const struct qrtr_ctrl_pkt *pkt = data + hdrlen;

		qrtr_node_assign(node, le32_to_cpu(pkt->server.node));
	}

	if (cb->type == QRTR_TYPE_RESUME_TX) {
		qrtr_tx_resume(node, skb);
	} else {
		ipc = qrtr_port_lookup(cb->dst_port);
		if (!ipc)
			goto err;

		if (sock_queue_rcv_skb(&ipc->sk, skb))
			goto err;

		qrtr_port_put(ipc);
	}

	return 0;

err:
	kfree_skb(skb);
	return -EINVAL;

}