Differential D26035 Diff 83362 usr.sbin/bhyve/net_backends.c

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usr.sbin/bhyve/net_backends.c

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#include <assert.h>		#include <assert.h>

#ifdef NETGRAPH		#ifdef NETGRAPH
#include <sys/param.h>		#include <sys/param.h>
#include <sys/sysctl.h>		#include <sys/sysctl.h>
#include <netgraph.h>		#include <netgraph.h>
#endif		#endif

		#include "config.h"
#include "debug.h"		#include "debug.h"
#include "iov.h"		#include "iov.h"
#include "mevent.h"		#include "mevent.h"
#include "net_backends.h"		#include "net_backends.h"
		#include "pci_emul.h"

#include <sys/linker_set.h>		#include <sys/linker_set.h>

/*		/*
* Each network backend registers a set of function pointers that are		* Each network backend registers a set of function pointers that are
* used to implement the net backends API.		* used to implement the net backends API.
* This might need to be exposed if we implement backends in separate files.		* This might need to be exposed if we implement backends in separate files.
*/		*/
struct net_backend {		struct net_backend {
const char prefix; / prefix matching this backend */		const char prefix; / prefix matching this backend */

/*		/*
* Routines used to initialize and cleanup the resources needed		* Routines used to initialize and cleanup the resources needed
* by a backend. The cleanup function is used internally,		* by a backend. The cleanup function is used internally,
* and should not be called by the frontend.		* and should not be called by the frontend.
*/		*/
int (init)(struct net_backend be, const char *devname,		int (init)(struct net_backend be, const char *devname,
const char opts, net_be_rxeof_t cb, void param);		nvlist_t nvl, net_be_rxeof_t cb, void param);
void (cleanup)(struct net_backend be);		void (cleanup)(struct net_backend be);

/*		/*
* Called to serve a guest transmit request. The scatter-gather		* Called to serve a guest transmit request. The scatter-gather
* vector provided by the caller has 'iovcnt' elements and contains		* vector provided by the caller has 'iovcnt' elements and contains
* the packet to send.		* the packet to send.
*/		*/
ssize_t (send)(struct net_backend be, const struct iovec *iov,		ssize_t (send)(struct net_backend be, const struct iovec *iov,
▲ Show 20 Lines • Show All 91 Lines • ▼ Show 20 Lines	tap_cleanup(struct net_backend *be)
if (be->fd != -1) {		if (be->fd != -1) {
close(be->fd);		close(be->fd);
be->fd = -1;		be->fd = -1;
}		}
}		}

static int		static int
tap_init(struct net_backend be, const char devname,		tap_init(struct net_backend be, const char devname,
const char opts, net_be_rxeof_t cb, void param)		nvlist_t nvl, net_be_rxeof_t cb, void param)
{		{
struct tap_priv priv = (struct tap_priv )be->opaque;		struct tap_priv priv = (struct tap_priv )be->opaque;
char tbuf[80];		char tbuf[80];
int opt = 1;		int opt = 1;
#ifndef WITHOUT_CAPSICUM		#ifndef WITHOUT_CAPSICUM
cap_rights_t rights;		cap_rights_t rights;
#endif		#endif

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/*		/*
* Netgraph backend		* Netgraph backend
*/		*/

#define NG_SBUF_MAX_SIZE (4 * 1024 * 1024)		#define NG_SBUF_MAX_SIZE (4 * 1024 * 1024)

static int		static int
ng_init(struct net_backend be, const char devname,		ng_init(struct net_backend be, const char devname,
const char opts, net_be_rxeof_t cb, void param)		nvlist_t nvl, net_be_rxeof_t cb, void param)
{		{
struct tap_priv p = (struct tap_priv )be->opaque;		struct tap_priv p = (struct tap_priv )be->opaque;
struct ngm_connect ngc;		struct ngm_connect ngc;
char ngopts, tofree;		const char value, nodename;
char nodename[NG_NODESIZ];
int sbsz;		int sbsz;
int ctrl_sock;		int ctrl_sock;
int flags;		int flags;
int path_provided;
int peerhook_provided;
int socket_provided;
unsigned long maxsbsz;		unsigned long maxsbsz;
size_t msbsz;		size_t msbsz;
#ifndef WITHOUT_CAPSICUM		#ifndef WITHOUT_CAPSICUM
cap_rights_t rights;		cap_rights_t rights;
#endif		#endif

if (cb == NULL) {		if (cb == NULL) {
WPRINTF(("Netgraph backend requires non-NULL callback"));		WPRINTF(("Netgraph backend requires non-NULL callback"));
return (-1);		return (-1);
}		}

be->fd = -1;		be->fd = -1;

memset(&ngc, 0, sizeof(ngc));		memset(&ngc, 0, sizeof(ngc));

strncpy(ngc.ourhook, "vmlink", NG_HOOKSIZ - 1);		value = get_config_value_node(nvl, "path");
		if (value == NULL) {
tofree = ngopts = strdup(opts);		WPRINTF(("path must be provided"));

if (ngopts == NULL) {
WPRINTF(("strdup error"));
return (-1);		return (-1);
}		}
		strncpy(ngc.path, value, NG_PATHSIZ - 1);

socket_provided = 0;		value = get_config_value_node(nvl, "hook");
path_provided = 0;
peerhook_provided = 0;

while (ngopts != NULL) {
char *value = ngopts;
char *key;

key = strsep(&value, "=");
if (value == NULL)		if (value == NULL)
break;		value = "vmlink";
ngopts = value;
(void) strsep(&ngopts, ",");

if (strcmp(key, "socket") == 0) {
strncpy(nodename, value, NG_NODESIZ - 1);
socket_provided = 1;
} else if (strcmp(key, "path") == 0) {
strncpy(ngc.path, value, NG_PATHSIZ - 1);
path_provided = 1;
} else if (strcmp(key, "hook") == 0) {
strncpy(ngc.ourhook, value, NG_HOOKSIZ - 1);		strncpy(ngc.ourhook, value, NG_HOOKSIZ - 1);
} else if (strcmp(key, "peerhook") == 0) {
strncpy(ngc.peerhook, value, NG_HOOKSIZ - 1);
peerhook_provided = 1;
}
}

free(tofree);		value = get_config_value_node(nvl, "peerhook");
		if (value == NULL) {
if (!path_provided) {
WPRINTF(("path must be provided"));
return (-1);
}

if (!peerhook_provided) {
WPRINTF(("peer hook must be provided"));		WPRINTF(("peer hook must be provided"));
return (-1);		return (-1);
}		}
		strncpy(ngc.peerhook, value, NG_HOOKSIZ - 1);

if (NgMkSockNode(socket_provided ? nodename : NULL,		nodename = get_config_value_node(nvl, "socket");
		if (NgMkSockNode(nodename,
&ctrl_sock, &be->fd) < 0) {		&ctrl_sock, &be->fd) < 0) {
WPRINTF(("can't get Netgraph sockets"));		WPRINTF(("can't get Netgraph sockets"));
return (-1);		return (-1);
}		}

if (NgSendMsg(ctrl_sock, ".",		if (NgSendMsg(ctrl_sock, ".",
NGM_GENERIC_COOKIE,		NGM_GENERIC_COOKIE,
NGM_CONNECT, &ngc, sizeof(ngc)) < 0) {		NGM_CONNECT, &ngc, sizeof(ngc)) < 0) {
▲ Show 20 Lines • Show All 173 Lines • ▼ Show 20 Lines	netmap_set_cap(struct net_backend *be, uint64_t features,
unsigned vnet_hdr_len)		unsigned vnet_hdr_len)
{		{

return (netmap_set_vnet_hdr_len(be, vnet_hdr_len));		return (netmap_set_vnet_hdr_len(be, vnet_hdr_len));
}		}

static int		static int
netmap_init(struct net_backend be, const char devname,		netmap_init(struct net_backend be, const char devname,
const char opts, net_be_rxeof_t cb, void param)		nvlist_t nvl, net_be_rxeof_t cb, void param)
{		{
struct netmap_priv priv = (struct netmap_priv )be->opaque;		struct netmap_priv priv = (struct netmap_priv )be->opaque;

strlcpy(priv->ifname, devname, sizeof(priv->ifname));		strlcpy(priv->ifname, devname, sizeof(priv->ifname));
priv->ifname[sizeof(priv->ifname) - 1] = '\0';		priv->ifname[sizeof(priv->ifname) - 1] = '\0';

priv->nmd = nm_open(priv->ifname, NULL, NETMAP_NO_TX_POLL, NULL);		priv->nmd = nm_open(priv->ifname, NULL, NETMAP_NO_TX_POLL, NULL);
if (priv->nmd == NULL) {		if (priv->nmd == NULL) {
▲ Show 20 Lines • Show All 243 Lines • ▼ Show 20 Lines	static struct net_backend vale_backend = {
.recv_disable = netmap_recv_disable,		.recv_disable = netmap_recv_disable,
.get_cap = netmap_get_cap,		.get_cap = netmap_get_cap,
.set_cap = netmap_set_cap,		.set_cap = netmap_set_cap,
};		};

DATA_SET(net_backend_set, netmap_backend);		DATA_SET(net_backend_set, netmap_backend);
DATA_SET(net_backend_set, vale_backend);		DATA_SET(net_backend_set, vale_backend);

		int
		netbe_legacy_config(nvlist_t nvl, const char opts)
		{
		char backend, cp;

		if (opts == NULL)
		return (0);

		cp = strchr(opts, ',');
		if (cp == NULL) {
		set_config_value_node(nvl, "backend", opts);
		return (0);
		}
		backend = strndup(opts, cp - opts);
		set_config_value_node(nvl, "backend", backend);
		free(backend);
		return (pci_parse_legacy_config(nvl, cp + 1));
		}

/*		/*
* Initialize a backend and attach to the frontend.		* Initialize a backend and attach to the frontend.
* This is called during frontend initialization.		* This is called during frontend initialization.
* @pbe is a pointer to the backend to be initialized		* @ret is a pointer to the backend to be initialized
* @devname is the backend-name as supplied on the command line,		* @devname is the backend-name as supplied on the command line,
* e.g. -s 2:0,frontend-name,backend-name[,other-args]		* e.g. -s 2:0,frontend-name,backend-name[,other-args]
* @cb is the receive callback supplied by the frontend,		* @cb is the receive callback supplied by the frontend,
* and it is invoked in the event loop when a receive		* and it is invoked in the event loop when a receive
* event is generated in the hypervisor,		* event is generated in the hypervisor,
* @param is a pointer to the frontend, and normally used as		* @param is a pointer to the frontend, and normally used as
* the argument for the callback.		* the argument for the callback.
*/		*/
int		int
netbe_init(struct net_backend *ret, const char opts, net_be_rxeof_t cb,		netbe_init(struct net_backend *ret, nvlist_t nvl, net_be_rxeof_t cb,
void *param)		void *param)
{		{
struct net_backend *pbe, nbe, *tbe = NULL;		struct net_backend *pbe, nbe, *tbe = NULL;
		const char *value;
char *devname;		char *devname;
char *options;
int err;		int err;

devname = options = strdup(opts);		value = get_config_value_node(nvl, "backend");
		if (value == NULL) {
		grehanUnsubmitted Done Inline Actions Should be `if (value == NULL)` grehan: Should be `if (value == NULL)`
if (devname == NULL) {
return (-1);		return (-1);
}		}
		devname = strdup(value);

devname = strsep(&options, ",");

/*		/*
* Find the network backend that matches the user-provided		* Find the network backend that matches the user-provided
* device name. net_backend_set is built using a linker set.		* device name. net_backend_set is built using a linker set.
*/		*/
SET_FOREACH(pbe, net_backend_set) {		SET_FOREACH(pbe, net_backend_set) {
if (strncmp(devname, (*pbe)->prefix,		if (strncmp(devname, (*pbe)->prefix,
strlen((*pbe)->prefix)) == 0) {		strlen((*pbe)->prefix)) == 0) {
tbe = *pbe;		tbe = *pbe;
Show All 16 Lines	netbe_init(struct net_backend *ret, nvlist_t nvl, net_be_rxeof_t cb,
nbe = calloc(1, sizeof(*nbe) + tbe->priv_size);		nbe = calloc(1, sizeof(*nbe) + tbe->priv_size);
nbe = tbe; /* copy the template */		nbe = tbe; /* copy the template */
nbe->fd = -1;		nbe->fd = -1;
nbe->sc = param;		nbe->sc = param;
nbe->be_vnet_hdr_len = 0;		nbe->be_vnet_hdr_len = 0;
nbe->fe_vnet_hdr_len = 0;		nbe->fe_vnet_hdr_len = 0;

/* Initialize the backend. */		/* Initialize the backend. */
err = nbe->init(nbe, devname, options, cb, param);		err = nbe->init(nbe, devname, nvl, cb, param);
if (err) {		if (err) {
free(devname);		free(devname);
free(nbe);		free(nbe);
return (err);		return (err);
}		}

*ret = nbe;		*ret = nbe;
free(devname);		free(devname);
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