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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
| Current File : //sys/amd64/compile/hs32/modules/usr/src/sys/modules/md/@/netgraph/ng_source.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
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: release/9.1.0/sys/netgraph/ng_source.c 220768 2011-04-18 09:12:27Z glebius $");
/*
* 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_WAITOK | M_ZERO);
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 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);
}