1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20  * OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
30  * to be used by network frontends such as virtio-net and e1000.
71 #define	NET_BE_SIZE(be)		(sizeof(*be) + (be)->priv_size)
78 	if (priv->mevp) {  in tap_cleanup()
79 		mevent_delete(priv->mevp);  in tap_cleanup()
81 	if (be->fd != -1) {  in tap_cleanup()
82 		close(be->fd);  in tap_cleanup()
83 		be->fd = -1;  in tap_cleanup()
100 		EPRINTLN("TAP backend requires non-NULL callback");  in tap_init()
101 		return (-1);  in tap_init()
107 	be->fd = open(tbuf, O_RDWR);  in tap_init()
108 	if (be->fd == -1) {  in tap_init()
114 	 * Set non-blocking and register for read  in tap_init()
117 	if (ioctl(be->fd, FIONBIO, &opt) < 0) {  in tap_init()
122 	if (strncmp("ngd", be->prefix, 3) &&  in tap_init()
123 	    ioctl(be->fd, VMIO_SIOCSIFFLAGS, up)) {  in tap_init()
130 	if (caph_rights_limit(be->fd, &rights) == -1)  in tap_init()
134 	memset(priv->bbuf, 0, sizeof(priv->bbuf));  in tap_init()
135 	priv->bbuflen = 0;  in tap_init()
137 	priv->mevp = mevent_add_disabled(be->fd, EVF_READ, cb, param);  in tap_init()
138 	if (priv->mevp == NULL) {  in tap_init()
139 		EPRINTLN("Could not register event");  in tap_init()
147 	return (-1);  in tap_init()
156 	return (writev(be->fd, iov, iovcnt));  in tap_send()
165 	if (priv->bbuflen > 0) {  in tap_peek_recvlen()
170 		return priv->bbuflen;  in tap_peek_recvlen()
178 	ret = read(be->fd, priv->bbuf, sizeof(priv->bbuf));  in tap_peek_recvlen()
184 		priv->bbuflen = ret;  in tap_peek_recvlen()
195 	if (priv->bbuflen > 0) {  in tap_recv()
200 		ret = buf_to_iov(priv->bbuf, priv->bbuflen,  in tap_recv()
203 		/* Mark the bounce buffer as empty. */  in tap_recv()
204 		priv->bbuflen = 0;  in tap_recv()
209 	ret = readv(be->fd, iov, iovcnt);  in tap_recv()
222 	mevent_enable(priv->mevp);  in tap_recv_enable()
230 	mevent_disable(priv->mevp);  in tap_recv_disable()
245 	return ((features || vnet_hdr_len) ? -1 : 0);  in tap_set_cap()
255 	.recv = tap_recv,
270 	.recv = tap_recv,
285 	.recv = tap_recv,
309 	backend = strndup(opts, cp - opts);  in netbe_legacy_config()
319  *  @devname is the backend-name as supplied on the command line,
320  * 	e.g. -s 2:0,frontend-name,backend-name[,other-args]
338 		return (-1);  in netbe_init()
351 	 * Find the network backend that matches the user-provided  in netbe_init()
355 		if (strncmp(type, (*pbe)->prefix,  in netbe_init()
356 		    strlen((*pbe)->prefix)) == 0) {  in netbe_init()
358 			assert(tbe->init != NULL);  in netbe_init()
359 			assert(tbe->cleanup != NULL);  in netbe_init()
360 			assert(tbe->send != NULL);  in netbe_init()
361 			assert(tbe->recv != NULL);  in netbe_init()
362 			assert(tbe->get_cap != NULL);  in netbe_init()
363 			assert(tbe->set_cap != NULL);  in netbe_init()
376 	nbe->fd = -1;  in netbe_init()
377 	nbe->sc = param;  in netbe_init()
378 	nbe->be_vnet_hdr_len = 0;  in netbe_init()
379 	nbe->fe_vnet_hdr_len = 0;  in netbe_init()
382 	err = nbe->init(nbe, devname, nvl, cb, param);  in netbe_init()
400 		be->cleanup(be);  in netbe_cleanup()
410 	return (be->get_cap(be));  in netbe_get_cap()
423 		&& vnet_hdr_len != (VNET_HDR_LEN - sizeof(uint16_t)))  in netbe_set_cap()
424 		return (-1);  in netbe_set_cap()
426 	be->fe_vnet_hdr_len = vnet_hdr_len;  in netbe_set_cap()
428 	ret = be->set_cap(be, features, vnet_hdr_len);  in netbe_set_cap()
429 	assert(be->be_vnet_hdr_len == 0 ||  in netbe_set_cap()
430 	       be->be_vnet_hdr_len == be->fe_vnet_hdr_len);  in netbe_set_cap()
439 	return (be->send(be, iov, iovcnt));  in netbe_send()
446 	return (be->peek_recvlen(be));  in netbe_peek_recvlen()
452  * the length of the packet just read. Return -1 in case of errors.
458 	return (be->recv(be, iov, iovcnt));  in netbe_recv()
471 	 * so there is no need for it to be per-vtnet or locked.  in netbe_rx_discard()
472 	 * We only make it large enough for TSO-sized segment.  in netbe_rx_discard()
487 	return be->recv_disable(be);  in netbe_rx_disable()
494 	return be->recv_enable(be);  in netbe_rx_enable()
501 	return (be->be_vnet_hdr_len);  in netbe_get_vnet_hdr_len()