freebsd-src/sys/netgraph/ng_source.c
Robert Watson 530c006014 Merge the remainder of kern_vimage.c and vimage.h into vnet.c and
vnet.h, we now use jails (rather than vimages) as the abstraction
for virtualization management, and what remained was specific to
virtual network stacks.  Minor cleanups are done in the process,
and comments updated to reflect these changes.

Reviewed by:	bz
Approved by:	re (vimage blanket)
2009-08-01 19:26:27 +00:00

922 lines
22 KiB
C

/*
* ng_source.c
*/
/*-
* Copyright (c) 2005 Gleb Smirnoff <glebius@FreeBSD.org>
* Copyright 2002 Sandvine Inc.
* All rights reserved.
*
* Subject to the following obligations and disclaimer of warranty, use and
* redistribution of this software, in source or object code forms, with or
* without modifications are expressly permitted by Sandvine Inc.; provided,
* however, that:
* 1. Any and all reproductions of the source or object code must include the
* copyright notice above and the following disclaimer of warranties; and
* 2. No rights are granted, in any manner or form, to use Sandvine Inc.
* trademarks, including the mark "SANDVINE" on advertising, endorsements,
* or otherwise except as such appears in the above copyright notice or in
* the software.
*
* THIS SOFTWARE IS BEING PROVIDED BY SANDVINE "AS IS", AND TO THE MAXIMUM
* EXTENT PERMITTED BY LAW, SANDVINE MAKES NO REPRESENTATIONS OR WARRANTIES,
* EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, INCLUDING WITHOUT LIMITATION,
* ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
* PURPOSE, OR NON-INFRINGEMENT. SANDVINE DOES NOT WARRANT, GUARANTEE, OR
* MAKE ANY REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE
* USE OF THIS SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY
* OR OTHERWISE. IN NO EVENT SHALL SANDVINE BE LIABLE FOR ANY DAMAGES
* RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING
* WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
* PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF SANDVINE IS ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* Author: Dave Chapeskie <dchapeskie@sandvine.com>
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* This node is used for high speed packet geneneration. It queues
* all data recieved on its 'input' hook and when told to start via
* a control message it sends the packets out its 'output' hook. In
* this way this node can be preloaded with a packet stream which it
* can then send continuously as fast as possible.
*
* Currently it just copies the mbufs as required. It could do various
* tricks to try and avoid this. Probably the best performance would
* be achieved by modifying the appropriate drivers to be told to
* self-re-enqueue packets (e.g. the if_bge driver could reuse the same
* transmit descriptors) under control of this node; perhaps via some
* flag in the mbuf or some such. The node could peek at an appropriate
* ifnet flag to see if such support is available for the connected
* interface.
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/errno.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/vnet.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/ng_parse.h>
#include <netgraph/ng_ether.h>
#include <netgraph/ng_source.h>
#define NG_SOURCE_INTR_TICKS 1
#define NG_SOURCE_DRIVER_IFQ_MAXLEN (4*1024)
#define mtod_off(m,off,t) ((t)(mtod((m),caddr_t)+(off)))
/* Per node info */
struct privdata {
node_p node;
hook_p input;
hook_p output;
struct ng_source_stats stats;
struct ifqueue snd_queue; /* packets to send */
struct mbuf *last_packet; /* last pkt in queue */
struct ifnet *output_ifp;
struct callout intr_ch;
uint64_t packets; /* packets to send */
uint32_t queueOctets;
struct ng_source_embed_info embed_timestamp;
struct ng_source_embed_cnt_info embed_counter[NG_SOURCE_COUNTERS];
};
typedef struct privdata *sc_p;
/* Node flags */
#define NG_SOURCE_ACTIVE (NGF_TYPE1)
/* Netgraph methods */
static ng_constructor_t ng_source_constructor;
static ng_rcvmsg_t ng_source_rcvmsg;
static ng_shutdown_t ng_source_rmnode;
static ng_newhook_t ng_source_newhook;
static ng_connect_t ng_source_connect;
static ng_rcvdata_t ng_source_rcvdata;
static ng_disconnect_t ng_source_disconnect;
/* Other functions */
static void ng_source_intr(node_p, hook_p, void *, int);
static void ng_source_clr_data (sc_p);
static int ng_source_start (sc_p, uint64_t);
static void ng_source_stop (sc_p);
static int ng_source_send (sc_p, int, int *);
static int ng_source_store_output_ifp(sc_p, char *);
static void ng_source_packet_mod(sc_p, struct mbuf *,
int, int, caddr_t, int);
static void ng_source_mod_counter(sc_p sc,
struct ng_source_embed_cnt_info *cnt,
struct mbuf *m, int increment);
static int ng_source_dup_mod(sc_p, struct mbuf *,
struct mbuf **);
/* Parse type for timeval */
static const struct ng_parse_struct_field ng_source_timeval_type_fields[] = {
{ "tv_sec", &ng_parse_int32_type },
{ "tv_usec", &ng_parse_int32_type },
{ NULL }
};
const struct ng_parse_type ng_source_timeval_type = {
&ng_parse_struct_type,
&ng_source_timeval_type_fields
};
/* Parse type for struct ng_source_stats */
static const struct ng_parse_struct_field ng_source_stats_type_fields[]
= NG_SOURCE_STATS_TYPE_INFO;
static const struct ng_parse_type ng_source_stats_type = {
&ng_parse_struct_type,
&ng_source_stats_type_fields
};
/* Parse type for struct ng_source_embed_info */
static const struct ng_parse_struct_field ng_source_embed_type_fields[] =
NG_SOURCE_EMBED_TYPE_INFO;
static const struct ng_parse_type ng_source_embed_type = {
&ng_parse_struct_type,
&ng_source_embed_type_fields
};
/* Parse type for struct ng_source_embed_cnt_info */
static const struct ng_parse_struct_field ng_source_embed_cnt_type_fields[] =
NG_SOURCE_EMBED_CNT_TYPE_INFO;
static const struct ng_parse_type ng_source_embed_cnt_type = {
&ng_parse_struct_type,
&ng_source_embed_cnt_type_fields
};
/* List of commands and how to convert arguments to/from ASCII */
static const struct ng_cmdlist ng_source_cmds[] = {
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_GET_STATS,
"getstats",
NULL,
&ng_source_stats_type
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_CLR_STATS,
"clrstats",
NULL,
NULL
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_GETCLR_STATS,
"getclrstats",
NULL,
&ng_source_stats_type
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_START,
"start",
&ng_parse_uint64_type,
NULL
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_STOP,
"stop",
NULL,
NULL
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_CLR_DATA,
"clrdata",
NULL,
NULL
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_SETIFACE,
"setiface",
&ng_parse_string_type,
NULL
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_SETPPS,
"setpps",
&ng_parse_uint32_type,
NULL
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_SET_TIMESTAMP,
"settimestamp",
&ng_source_embed_type,
NULL
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_GET_TIMESTAMP,
"gettimestamp",
NULL,
&ng_source_embed_type
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_SET_COUNTER,
"setcounter",
&ng_source_embed_cnt_type,
NULL
},
{
NGM_SOURCE_COOKIE,
NGM_SOURCE_GET_COUNTER,
"getcounter",
&ng_parse_uint8_type,
&ng_source_embed_cnt_type
},
{ 0 }
};
/* Netgraph type descriptor */
static struct ng_type ng_source_typestruct = {
.version = NG_ABI_VERSION,
.name = NG_SOURCE_NODE_TYPE,
.constructor = ng_source_constructor,
.rcvmsg = ng_source_rcvmsg,
.shutdown = ng_source_rmnode,
.newhook = ng_source_newhook,
.connect = ng_source_connect,
.rcvdata = ng_source_rcvdata,
.disconnect = ng_source_disconnect,
.cmdlist = ng_source_cmds,
};
NETGRAPH_INIT(source, &ng_source_typestruct);
static int ng_source_set_autosrc(sc_p, uint32_t);
/*
* Node constructor
*/
static int
ng_source_constructor(node_p node)
{
sc_p sc;
sc = malloc(sizeof(*sc), M_NETGRAPH, M_NOWAIT | M_ZERO);
if (sc == NULL)
return (ENOMEM);
NG_NODE_SET_PRIVATE(node, sc);
sc->node = node;
sc->snd_queue.ifq_maxlen = 2048; /* XXX not checked */
ng_callout_init(&sc->intr_ch);
return (0);
}
/*
* Add a hook
*/
static int
ng_source_newhook(node_p node, hook_p hook, const char *name)
{
sc_p sc = NG_NODE_PRIVATE(node);
if (strcmp(name, NG_SOURCE_HOOK_INPUT) == 0) {
sc->input = hook;
} else if (strcmp(name, NG_SOURCE_HOOK_OUTPUT) == 0) {
sc->output = hook;
sc->output_ifp = 0;
bzero(&sc->stats, sizeof(sc->stats));
} else
return (EINVAL);
return (0);
}
/*
* Hook has been added
*/
static int
ng_source_connect(hook_p hook)
{
sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct ng_mesg *msg;
int dummy_error = 0;
/*
* If this is "output" hook, then request information
* from our downstream.
*/
if (hook == sc->output) {
NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_GET_IFNAME,
0, M_NOWAIT);
if (msg == NULL)
return (ENOBUFS);
/*
* Our hook and peer hook have HK_INVALID flag set,
* so we can't use NG_SEND_MSG_HOOK() macro here.
*/
NG_SEND_MSG_ID(dummy_error, sc->node, msg,
NG_NODE_ID(NG_PEER_NODE(sc->output)), NG_NODE_ID(sc->node));
}
return (0);
}
/*
* Receive a control message
*/
static int
ng_source_rcvmsg(node_p node, item_p item, hook_p lasthook)
{
sc_p sc = NG_NODE_PRIVATE(node);
struct ng_mesg *msg, *resp = NULL;
int error = 0;
NGI_GET_MSG(item, msg);
switch (msg->header.typecookie) {
case NGM_SOURCE_COOKIE:
if (msg->header.flags & NGF_RESP) {
error = EINVAL;
break;
}
switch (msg->header.cmd) {
case NGM_SOURCE_GET_STATS:
case NGM_SOURCE_CLR_STATS:
case NGM_SOURCE_GETCLR_STATS:
{
struct ng_source_stats *stats;
if (msg->header.cmd != NGM_SOURCE_CLR_STATS) {
NG_MKRESPONSE(resp, msg,
sizeof(*stats), M_NOWAIT);
if (resp == NULL) {
error = ENOMEM;
goto done;
}
sc->stats.queueOctets = sc->queueOctets;
sc->stats.queueFrames = sc->snd_queue.ifq_len;
if ((sc->node->nd_flags & NG_SOURCE_ACTIVE)
&& !timevalisset(&sc->stats.endTime)) {
getmicrotime(&sc->stats.elapsedTime);
timevalsub(&sc->stats.elapsedTime,
&sc->stats.startTime);
}
stats = (struct ng_source_stats *)resp->data;
bcopy(&sc->stats, stats, sizeof(* stats));
}
if (msg->header.cmd != NGM_SOURCE_GET_STATS)
bzero(&sc->stats, sizeof(sc->stats));
}
break;
case NGM_SOURCE_START:
{
uint64_t packets;
if (msg->header.arglen != sizeof(uint64_t)) {
error = EINVAL;
break;
}
packets = *(uint64_t *)msg->data;
error = ng_source_start(sc, packets);
break;
}
case NGM_SOURCE_STOP:
ng_source_stop(sc);
break;
case NGM_SOURCE_CLR_DATA:
ng_source_clr_data(sc);
break;
case NGM_SOURCE_SETIFACE:
{
char *ifname = (char *)msg->data;
if (msg->header.arglen < 2) {
error = EINVAL;
break;
}
ng_source_store_output_ifp(sc, ifname);
break;
}
case NGM_SOURCE_SETPPS:
{
uint32_t pps;
if (msg->header.arglen != sizeof(uint32_t)) {
error = EINVAL;
break;
}
pps = *(uint32_t *)msg->data;
sc->stats.maxPps = pps;
break;
}
case NGM_SOURCE_SET_TIMESTAMP:
{
struct ng_source_embed_info *embed;
if (msg->header.arglen != sizeof(*embed)) {
error = EINVAL;
goto done;
}
embed = (struct ng_source_embed_info *)msg->data;
bcopy(embed, &sc->embed_timestamp, sizeof(*embed));
break;
}
case NGM_SOURCE_GET_TIMESTAMP:
{
struct ng_source_embed_info *embed;
NG_MKRESPONSE(resp, msg, sizeof(*embed), M_DONTWAIT);
if (resp == NULL) {
error = ENOMEM;
goto done;
}
embed = (struct ng_source_embed_info *)resp->data;
bcopy(&sc->embed_timestamp, embed, sizeof(*embed));
break;
}
case NGM_SOURCE_SET_COUNTER:
{
struct ng_source_embed_cnt_info *embed;
if (msg->header.arglen != sizeof(*embed)) {
error = EINVAL;
goto done;
}
embed = (struct ng_source_embed_cnt_info *)msg->data;
if (embed->index >= NG_SOURCE_COUNTERS ||
!(embed->width == 1 || embed->width == 2 ||
embed->width == 4)) {
error = EINVAL;
goto done;
}
bcopy(embed, &sc->embed_counter[embed->index],
sizeof(*embed));
break;
}
case NGM_SOURCE_GET_COUNTER:
{
uint8_t index = *(uint8_t *)msg->data;
struct ng_source_embed_cnt_info *embed;
if (index >= NG_SOURCE_COUNTERS) {
error = EINVAL;
goto done;
}
NG_MKRESPONSE(resp, msg, sizeof(*embed), M_DONTWAIT);
if (resp == NULL) {
error = ENOMEM;
goto done;
}
embed = (struct ng_source_embed_cnt_info *)resp->data;
bcopy(&sc->embed_counter[index], embed, sizeof(*embed));
break;
}
default:
error = EINVAL;
break;
}
break;
case NGM_ETHER_COOKIE:
if (!(msg->header.flags & NGF_RESP)) {
error = EINVAL;
break;
}
switch (msg->header.cmd) {
case NGM_ETHER_GET_IFNAME:
{
char *ifname = (char *)msg->data;
if (msg->header.arglen < 2) {
error = EINVAL;
break;
}
if (ng_source_store_output_ifp(sc, ifname) == 0)
ng_source_set_autosrc(sc, 0);
break;
}
default:
error = EINVAL;
}
break;
default:
error = EINVAL;
break;
}
done:
/* Take care of synchronous response, if any. */
NG_RESPOND_MSG(error, node, item, resp);
/* Free the message and return. */
NG_FREE_MSG(msg);
return (error);
}
/*
* Receive data on a hook
*
* If data comes in the input hook, enqueue it on the send queue.
* If data comes in the output hook, discard it.
*/
static int
ng_source_rcvdata(hook_p hook, item_p item)
{
sc_p sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct mbuf *m;
int error = 0;
NGI_GET_M(item, m);
NG_FREE_ITEM(item);
/* Which hook? */
if (hook == sc->output) {
/* discard */
NG_FREE_M(m);
return (error);
}
KASSERT(hook == sc->input, ("%s: no hook!", __func__));
/* Enqueue packet. */
/* XXX should we check IF_QFULL() ? */
_IF_ENQUEUE(&sc->snd_queue, m);
sc->queueOctets += m->m_pkthdr.len;
sc->last_packet = m;
return (0);
}
/*
* Shutdown processing
*/
static int
ng_source_rmnode(node_p node)
{
sc_p sc = NG_NODE_PRIVATE(node);
ng_source_stop(sc);
ng_source_clr_data(sc);
NG_NODE_SET_PRIVATE(node, NULL);
NG_NODE_UNREF(node);
free(sc, M_NETGRAPH);
return (0);
}
/*
* Hook disconnection
*/
static int
ng_source_disconnect(hook_p hook)
{
sc_p sc;
sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
KASSERT(sc != NULL, ("%s: null node private", __func__));
if (NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0 || hook == sc->output)
ng_rmnode_self(NG_HOOK_NODE(hook));
return (0);
}
/*
* Set sc->output_ifp to point to the the struct ifnet of the interface
* reached via our output hook.
*/
static int
ng_source_store_output_ifp(sc_p sc, char *ifname)
{
struct ifnet *ifp;
int s;
ifp = ifunit(ifname);
if (ifp == NULL) {
printf("%s: can't find interface %s\n", __func__, ifname);
return (EINVAL);
}
sc->output_ifp = ifp;
#if 1
/* XXX mucking with a drivers ifqueue size is ugly but we need it
* to queue a lot of packets to get close to line rate on a gigabit
* interface with small packets.
* XXX we should restore the original value at stop or disconnect
*/
s = splimp(); /* XXX is this required? */
if (ifp->if_snd.ifq_maxlen < NG_SOURCE_DRIVER_IFQ_MAXLEN) {
printf("ng_source: changing ifq_maxlen from %d to %d\n",
ifp->if_snd.ifq_maxlen, NG_SOURCE_DRIVER_IFQ_MAXLEN);
ifp->if_snd.ifq_maxlen = NG_SOURCE_DRIVER_IFQ_MAXLEN;
}
splx(s);
#endif
return (0);
}
/*
* Set the attached ethernet node's ethernet source address override flag.
*/
static int
ng_source_set_autosrc(sc_p sc, uint32_t flag)
{
struct ng_mesg *msg;
int error = 0;
NG_MKMESSAGE(msg, NGM_ETHER_COOKIE, NGM_ETHER_SET_AUTOSRC,
sizeof (uint32_t), M_NOWAIT);
if (msg == NULL)
return(ENOBUFS);
*(uint32_t *)msg->data = flag;
NG_SEND_MSG_HOOK(error, sc->node, msg, sc->output, 0);
return (error);
}
/*
* Clear out the data we've queued
*/
static void
ng_source_clr_data (sc_p sc)
{
struct mbuf *m;
for (;;) {
_IF_DEQUEUE(&sc->snd_queue, m);
if (m == NULL)
break;
NG_FREE_M(m);
}
sc->queueOctets = 0;
sc->last_packet = NULL;
}
/*
* Start sending queued data out the output hook
*/
static int
ng_source_start(sc_p sc, uint64_t packets)
{
if (sc->output_ifp == NULL) {
printf("ng_source: start without iface configured\n");
return (ENXIO);
}
if (sc->node->nd_flags & NG_SOURCE_ACTIVE)
return (EBUSY);
sc->node->nd_flags |= NG_SOURCE_ACTIVE;
sc->packets = packets;
timevalclear(&sc->stats.elapsedTime);
timevalclear(&sc->stats.endTime);
getmicrotime(&sc->stats.startTime);
getmicrotime(&sc->stats.lastTime);
ng_callout(&sc->intr_ch, sc->node, NULL, 0,
ng_source_intr, sc, 0);
return (0);
}
/*
* Stop sending queued data out the output hook
*/
static void
ng_source_stop(sc_p sc)
{
ng_uncallout(&sc->intr_ch, sc->node);
sc->node->nd_flags &= ~NG_SOURCE_ACTIVE;
getmicrotime(&sc->stats.endTime);
sc->stats.elapsedTime = sc->stats.endTime;
timevalsub(&sc->stats.elapsedTime, &sc->stats.startTime);
}
/*
* While active called every NG_SOURCE_INTR_TICKS ticks.
* Sends as many packets as the interface connected to our
* output hook is able to enqueue.
*/
static void
ng_source_intr(node_p node, hook_p hook, void *arg1, int arg2)
{
sc_p sc = (sc_p)arg1;
struct ifqueue *ifq;
int packets;
KASSERT(sc != NULL, ("%s: null node private", __func__));
if (sc->packets == 0 || sc->output == NULL
|| (sc->node->nd_flags & NG_SOURCE_ACTIVE) == 0) {
ng_source_stop(sc);
return;
}
if (sc->output_ifp != NULL) {
ifq = (struct ifqueue *)&sc->output_ifp->if_snd;
packets = ifq->ifq_maxlen - ifq->ifq_len;
} else
packets = sc->snd_queue.ifq_len;
if (sc->stats.maxPps != 0) {
struct timeval now, elapsed;
uint64_t usec;
int maxpkt;
getmicrotime(&now);
elapsed = now;
timevalsub(&elapsed, &sc->stats.lastTime);
usec = elapsed.tv_sec * 1000000 + elapsed.tv_usec;
maxpkt = (uint64_t)sc->stats.maxPps * usec / 1000000;
sc->stats.lastTime = now;
if (packets > maxpkt)
packets = maxpkt;
}
ng_source_send(sc, packets, NULL);
if (sc->packets == 0)
ng_source_stop(sc);
else
ng_callout(&sc->intr_ch, node, NULL, NG_SOURCE_INTR_TICKS,
ng_source_intr, sc, 0);
}
/*
* Send packets out our output hook.
*/
static int
ng_source_send(sc_p sc, int tosend, int *sent_p)
{
struct mbuf *m, *m2;
int sent;
int error = 0;
KASSERT(tosend >= 0, ("%s: negative tosend param", __func__));
KASSERT(sc->node->nd_flags & NG_SOURCE_ACTIVE,
("%s: inactive node", __func__));
if ((uint64_t)tosend > sc->packets)
tosend = sc->packets;
/* Go through the queue sending packets one by one. */
for (sent = 0; error == 0 && sent < tosend; ++sent) {
_IF_DEQUEUE(&sc->snd_queue, m);
if (m == NULL)
break;
/* Duplicate and modify the packet. */
error = ng_source_dup_mod(sc, m, &m2);
if (error) {
if (error == ENOBUFS)
_IF_PREPEND(&sc->snd_queue, m);
else
_IF_ENQUEUE(&sc->snd_queue, m);
break;
}
/* Re-enqueue the original packet for us. */
_IF_ENQUEUE(&sc->snd_queue, m);
sc->stats.outFrames++;
sc->stats.outOctets += m2->m_pkthdr.len;
NG_SEND_DATA_ONLY(error, sc->output, m2);
if (error)
break;
}
sc->packets -= sent;
if (sent_p != NULL)
*sent_p = sent;
return (error);
}
/*
* Modify packet in 'm' by changing 'len' bytes starting at 'offset'
* to data in 'cp'.
*
* The packet data in 'm' must be in a contiguous buffer in a single mbuf.
*/
static void
ng_source_packet_mod(sc_p sc, struct mbuf *m, int offset, int len, caddr_t cp,
int flags)
{
if (len == 0)
return;
/* Can't modify beyond end of packet. */
/* TODO: Pad packet for this case. */
if (offset + len > m->m_len)
return;
bcopy(cp, mtod_off(m, offset, caddr_t), len);
}
static void
ng_source_mod_counter(sc_p sc, struct ng_source_embed_cnt_info *cnt,
struct mbuf *m, int increment)
{
caddr_t cp;
uint32_t val;
val = htonl(cnt->next_val);
cp = (caddr_t)&val + sizeof(val) - cnt->width;
ng_source_packet_mod(sc, m, cnt->offset, cnt->width, cp, cnt->flags);
if (increment) {
cnt->next_val += increment;
if (increment > 0 && cnt->next_val > cnt->max_val) {
cnt->next_val = cnt->min_val - 1 +
(cnt->next_val - cnt->max_val);
if (cnt->next_val > cnt->max_val)
cnt->next_val = cnt->max_val;
} else if (increment < 0 && cnt->next_val < cnt->min_val) {
cnt->next_val = cnt->max_val + 1 +
(cnt->next_val - cnt->min_val);
if (cnt->next_val < cnt->min_val)
cnt->next_val = cnt->max_val;
}
}
}
static int
ng_source_dup_mod(sc_p sc, struct mbuf *m0, struct mbuf **m_ptr)
{
struct mbuf *m;
struct ng_source_embed_cnt_info *cnt;
struct ng_source_embed_info *ts;
int modify;
int error = 0;
int i, increment;
/* Are we going to modify packets? */
modify = sc->embed_timestamp.flags & NGM_SOURCE_EMBED_ENABLE;
for (i = 0; !modify && i < NG_SOURCE_COUNTERS; ++i)
modify = sc->embed_counter[i].flags & NGM_SOURCE_EMBED_ENABLE;
/* Duplicate the packet. */
if (modify)
m = m_dup(m0, M_DONTWAIT);
else
m = m_copypacket(m0, M_DONTWAIT);
if (m == NULL) {
error = ENOBUFS;
goto done;
}
*m_ptr = m;
if (!modify)
goto done;
/* Modify the copied packet for sending. */
KASSERT(M_WRITABLE(m), ("%s: packet not writable", __func__));
for (i = 0; i < NG_SOURCE_COUNTERS; ++i) {
cnt = &sc->embed_counter[i];
if (cnt->flags & NGM_SOURCE_EMBED_ENABLE) {
if ((cnt->flags & NGM_SOURCE_INC_CNT_PER_LIST) == 0 ||
sc->last_packet == m0)
increment = cnt->increment;
else
increment = 0;
ng_source_mod_counter(sc, cnt, m, increment);
}
}
ts = &sc->embed_timestamp;
if (ts->flags & NGM_SOURCE_EMBED_ENABLE) {
struct timeval now;
getmicrotime(&now);
now.tv_sec = htonl(now.tv_sec);
now.tv_usec = htonl(now.tv_usec);
ng_source_packet_mod(sc, m, ts->offset, sizeof (now),
(caddr_t)&now, ts->flags);
}
done:
return(error);
}