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Convert Netgraph to use mbuf tags to pass its meta information around.

Browse Source 
Thanks to Sam for importing tags in a way that allowed this to be done.

Submitted by:	Gleb Smirnoff <glebius@cell.sick.ru>
Also allow the sr and ar drivers to create netgraph versions of their modules.
Document the change to the ksocket node.
This commit is contained in:
Julian Elischer 2004-06-25 19:22:05 +00:00
parent 865897c9f1
commit 327b288e5c
15 changed files with 139 additions and 93 deletions
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23
share/man/man4/ng_ksocket.4
View File

@ -34,7 +34,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd November 15, 1999
.Dd June 8, 2004
.Dt NG_KSOCKET 4
.Os
.Sh NAME
@ -88,6 +88,24 @@ well. For example
.Dv inet/dgram/udp
is a more readable but equivalent version of
.Dv 2/2/17 .
.Pp
Data received into socket is sent out via hook.
Data received on hook is sent out from socket, if the latter is
connected (an
.Dv NGM_KSOCKET_CONNECT
was sent to node before).
If socket is not connected, destination
.Dv "struct sockaddr"
must be supplied in an mbuf tag with cookie
.Dv NGM_KSOCKET_COOKIE
and type
.Dv NG_KSOCKET_TAG_SOCKADDR
attached to data.
Otherwise
.Nm
will return
.Dv ENOTCONN
to sender.
.Sh CONTROL MESSAGES
This node type supports the generic control messages, plus the following:
.Bl -tag -width foo
@ -190,7 +208,8 @@ Shutdown of the node closes the associated socket.
.Xr socket 2 ,
.Xr netgraph 4 ,
.Xr ng_socket 4 ,
.Xr ngctl 8
.Xr ngctl 8 ,
.Xr mbuf_tags 9
.Sh HISTORY
The
.Nm

11
sys/dev/ar/if_ar.c
View File

@ -2228,10 +2228,9 @@ ngar_rcvdata(hook_p hook, item_p item)
struct ar_softc * sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct ifqueue *xmitq_p;
struct mbuf *m;
meta_p meta;
struct ng_tag_prio *ptag;
NGI_GET_M(item, m);
NGI_GET_META(item, meta);
NG_FREE_ITEM(item);
/*
* data doesn't come in from just anywhere (e.g control hook)
@ -2244,11 +2243,12 @@ ngar_rcvdata(hook_p hook, item_p item)
/*
* Now queue the data for when it can be sent
*/
if (meta && meta->priority > 0) {
if ((ptag = (struct ng_tag_prio *)m_tag_locate(m, NGM_GENERIC_COOKIE,
NG_TAG_PRIO, NULL)) != NULL && (ptag->priority > NG_PRIO_CUTOFF) )
xmitq_p = (&sc->xmitq_hipri);
} else {
else
xmitq_p = (&sc->xmitq);
}
s = splimp();
IF_LOCK(xmitq_p);
if (_IF_QFULL(xmitq_p)) {
@ -2270,7 +2270,6 @@ ngar_rcvdata(hook_p hook, item_p item)
* check if we need to free the mbuf, and then return the error
*/
NG_FREE_M(m);
NG_FREE_META(meta);
return (error);
}

14
sys/dev/cp/if_cp.c
View File

@ -2261,7 +2261,7 @@ static int ng_cp_rcvdata (hook_p hook, item_p item)
{
drv_t *d = NG_NODE_PRIVATE (NG_HOOK_NODE(hook));
struct mbuf *m;
meta_p meta;
struct ng_tag_prio *ptag;
#else
static int ng_cp_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
{
@ -2273,18 +2273,23 @@ static int ng_cp_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
CP_DEBUG2 (d, ("Rcvdata\n"));
#if __FreeBSD_version >= 500000
NGI_GET_M (item, m);
NGI_GET_META (item, meta);
NG_FREE_ITEM (item);
if (! NG_HOOK_PRIVATE (hook) || ! d) {
NG_FREE_M (m);
NG_FREE_META (meta);
#else
if (! hook->private || ! d) {
NG_FREE_DATA (m,meta);
#endif
return ENETDOWN;
}
q = (meta && meta->priority > 0) ? &d->hi_queue : &d->queue;
/* Check for high priority data */
if ((ptag = (struct ng_tag_prio *)m_tag_locate(m, NGM_GENERIC_COOKIE,
NG_TAG_PRIO, NULL)) != NULL && (ptag->priority > NG_PRIO_CUTOFF) )
q = &d->hi_queue;
else
q = &d->queue;
s = splimp ();
#if __FreeBSD_version >= 500000
IF_LOCK (q);
@ -2293,7 +2298,6 @@ static int ng_cp_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
IF_UNLOCK (q);
splx (s);
NG_FREE_M (m);
NG_FREE_META (meta);
return ENOBUFS;
}
_IF_ENQUEUE (q, m);

14
sys/dev/ctau/if_ct.c
View File

@ -2187,7 +2187,7 @@ static int ng_ct_rcvdata (hook_p hook, item_p item)
{
drv_t *d = NG_NODE_PRIVATE (NG_HOOK_NODE(hook));
struct mbuf *m;
meta_p meta;
struct ng_tag_prio *ptag;
#else
static int ng_ct_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
{
@ -2201,18 +2201,23 @@ static int ng_ct_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
#if __FreeBSD_version >= 500000
NGI_GET_M (item, m);
NGI_GET_META (item, meta);
NG_FREE_ITEM (item);
if (! NG_HOOK_PRIVATE (hook) || ! d) {
NG_FREE_M (m);
NG_FREE_META (meta);
#else
if (! hook->private || ! d) {
NG_FREE_DATA (m,meta);
#endif
return ENETDOWN;
}
q = (meta && meta->priority > 0) ? &d->hi_queue : &d->queue;
/* Check for high priority data */
if ((ptag = (struct ng_tag_prio *)m_tag_locate(m, NGM_GENERIC_COOKIE,
NG_TAG_PRIO, NULL)) != NULL && (ptag->priority > NG_PRIO_CUTOFF) )
q = &d->hi_queue;
else
q = &d->queue;
s = splimp ();
#if __FreeBSD_version >= 500000
IF_LOCK (q);
@ -2221,7 +2226,6 @@ static int ng_ct_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
IF_UNLOCK (q);
splx (s);
NG_FREE_M (m);
NG_FREE_META (meta);
return ENOBUFS;
}
_IF_ENQUEUE (q, m);

14
sys/dev/cx/if_cx.c
View File

@ -2705,7 +2705,7 @@ static int ng_cx_rcvdata (hook_p hook, item_p item)
{
drv_t *d = NG_NODE_PRIVATE (NG_HOOK_NODE(hook));
struct mbuf *m;
meta_p meta;
struct ng_tag_prio *ptag;
#else
static int ng_cx_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
{
@ -2716,18 +2716,23 @@ static int ng_cx_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
#if __FreeBSD_version >= 500000
NGI_GET_M (item, m);
NGI_GET_META (item, meta);
NG_FREE_ITEM (item);
if (! NG_HOOK_PRIVATE (hook) || ! d) {
NG_FREE_M (m);
NG_FREE_META (meta);
#else
if (! hook->private || ! d) {
NG_FREE_DATA (m,meta);
#endif
return ENETDOWN;
}
q = (meta && meta->priority > 0) ? &d->hi_queue : &d->lo_queue;
/* Check for high priority data */
if ((ptag = (struct ng_tag_prio *)m_tag_locate(m, NGM_GENERIC_COOKIE,
NG_TAG_PRIO, NULL)) != NULL && (ptag->priority > NG_PRIO_CUTOFF) )
q = &d->hi_queue;
else
q = &d->lo_queue;
s = splhigh ();
#if __FreeBSD_version >= 500000
IF_LOCK (q);
@ -2736,7 +2741,6 @@ static int ng_cx_rcvdata (hook_p hook, struct mbuf *m, meta_p meta)
IF_UNLOCK (q);
splx (s);
NG_FREE_M (m);
NG_FREE_META (meta);
return ENOBUFS;
}
_IF_ENQUEUE (q, m);

11
sys/dev/sr/if_sr.c
View File

@ -2830,10 +2830,9 @@ ngsr_rcvdata(hook_p hook, item_p item)
struct sr_softc * sc = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
struct ifqueue *xmitq_p;
struct mbuf *m;
meta_p meta;
struct ng_tag_prio *ptag;
NGI_GET_M(item, m);
NGI_GET_META(item, meta);
NG_FREE_ITEM(item);
/*
* data doesn't come in from just anywhere (e.g control hook)
@ -2846,11 +2845,12 @@ ngsr_rcvdata(hook_p hook, item_p item)
/*
* Now queue the data for when it can be sent
*/
if (meta && meta->priority > 0) {
if ((ptag = (struct ng_tag_prio *)m_tag_locate(m, NGM_GENERIC_COOKIE,
NG_TAG_PRIO, NULL)) != NULL && (ptag->priority > NG_PRIO_CUTOFF) )
xmitq_p = (&sc->xmitq_hipri);
} else {
else
xmitq_p = (&sc->xmitq);
}
s = splimp();
IF_LOCK(xmitq_p);
if (_IF_QFULL(xmitq_p)) {
@ -2872,7 +2872,6 @@ ngsr_rcvdata(hook_p hook, item_p item)
* check if we need to free the mbuf, and then return the error
*/
NG_FREE_M(m);
NG_FREE_META(meta);
return (error);
}

12
sys/dev/usb/udbp.c
View File

@ -729,19 +729,20 @@ ng_udbp_rcvdata(hook_p hook, item_p item)
struct ifqueue *xmitq_p;
int s;
struct mbuf *m;
meta_p meta;
struct ng_tag_prio *ptag;
NGI_GET_M(item, m);
NGI_GET_META(item, meta);
NG_FREE_ITEM(item);
/*
* Now queue the data for when it can be sent
*/
if (meta && meta->priority > 0) {
if ((ptag = (struct ng_tag_prio *)m_tag_locate(m, NGM_GENERIC_COOKIE,
NG_TAG_PRIO, NULL)) != NULL && (ptag->priority > NG_PRIO_CUTOFF) )
xmitq_p = (&sc->xmitq_hipri);
} else {
else
xmitq_p = (&sc->xmitq);
}
s = splusb();
IF_LOCK(xmitq_p);
if (_IF_QFULL(xmitq_p)) {
@ -763,7 +764,6 @@ ng_udbp_rcvdata(hook_p hook, item_p item)
* check if we need to free the mbuf, and then return the error
*/
NG_FREE_M(m);
NG_FREE_META(meta);
return (error);
}

9
sys/modules/ar/Makefile
View File

@ -5,4 +5,13 @@ KMOD = if_ar
SRCS = if_ar.c if_ar_isa.c if_ar_pci.c
SRCS += device_if.h bus_if.h pci_if.h isa_if.h opt_netgraph.h
NETGRAPH?= 0
opt_netgraph.h:
.if ${NETGRAPH} != 0
echo "#define NETGRAPH ${NETGRAPH}" > opt_netgraph.h
.else
echo "" > opt_netgraph.h
.endif
.include <bsd.kmod.mk>

9
sys/modules/sr/Makefile
View File

@ -5,4 +5,13 @@ KMOD = if_sr
SRCS = if_sr.c if_sr_isa.c if_sr_pci.c
SRCS += device_if.h bus_if.h pci_if.h isa_if.h opt_netgraph.h
NETGRAPH?= 0
opt_netgraph.h:
.if ${NETGRAPH} != 0
echo "#define NETGRAPH ${NETGRAPH}" > opt_netgraph.h
.else
echo "" > opt_netgraph.h
.endif
.include <bsd.kmod.mk>

1
sys/netgraph/atm/uni/ng_uni_cust.h
View File

@ -38,6 +38,7 @@
#include <sys/queue.h>
#include <sys/lock.h>
#include <sys/mutex.h>
#include <sys/mbuf.h>
#include <netgraph/ng_message.h>
#include <netgraph/netgraph.h>
#include <netgraph/atm/ngatmbase.h>

18
sys/netgraph/netgraph.h
View File

@ -1137,10 +1137,24 @@ struct callout_handle
ng_item_fn *fn, void * arg1, int arg2);
/*
* prototypes the user should DEFINITLY not use directly
* prototypes the user should DEFINITELY not use directly
*/
void ng_free_item(item_p item); /* Use NG_FREE_ITEM instead */
int ng_mod_event(module_t mod, int what, void *arg);
#endif /* _NETGRAPH_NETGRAPH_H_ */
/*
* Tag definitions and constants
*/
#define NG_TAG_PRIO 1
struct ng_tag_prio {
struct m_tag tag;
char priority;
char discardability;
};
#define NG_PRIO_CUTOFF 32
#define NG_PRIO_LINKSTATE 64
#endif /* _NETGRAPH_NETGRAPH_H_ */

53
sys/netgraph/ng_ksocket.c
View File

@ -893,9 +893,9 @@ ng_ksocket_rcvdata(hook_p hook, item_p item)
const priv_p priv = NG_NODE_PRIVATE(node);
struct socket *const so = priv->so;
struct sockaddr *sa = NULL;
meta_p meta;
int error;
struct mbuf *m;
struct sa_tag *stag;
/* Avoid reentrantly sending on the socket */
if ((priv->flags & KSF_SENDING) != 0) {
@ -903,35 +903,20 @@ ng_ksocket_rcvdata(hook_p hook, item_p item)
return (EDEADLK);
}
/* Extract data and meta information */
/* Extract data */
NGI_GET_M(item, m);
NGI_GET_META(item, meta);
NG_FREE_ITEM(item);
/* If any meta info, look for peer socket address */
if (meta != NULL) {
struct meta_field_header *field;
/* Look for peer socket address */
for (field = &meta->options[0];
(caddr_t)field < (caddr_t)meta + meta->used_len;
field = (struct meta_field_header *)
((caddr_t)field + field->len)) {
if (field->cookie != NGM_KSOCKET_COOKIE
|| field->type != NG_KSOCKET_META_SOCKADDR)
continue;
sa = (struct sockaddr *)field->data;
break;
}
}
/* Look if socket address is stored in packet tags */
if ((stag = (struct sa_tag *)m_tag_locate(m, NGM_KSOCKET_COOKIE,
NG_KSOCKET_TAG_SOCKADDR, NULL)) != NULL)
sa = &stag->sa;
/* Send packet */
priv->flags |= KSF_SENDING;
error = (*so->so_proto->pr_usrreqs->pru_sosend)(so, sa, 0, m, 0, 0, td);
priv->flags &= ~KSF_SENDING;
/* Clean up and exit */
NG_FREE_META(meta);
return (error);
}
@ -1103,7 +1088,6 @@ ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int waitflag)
flags = MSG_DONTWAIT;
while (1) {
struct sockaddr *sa = NULL;
meta_p meta = NULL;
struct mbuf *n;
/* Try to get next packet from socket */
@ -1124,30 +1108,23 @@ ng_ksocket_incoming2(node_p node, hook_p hook, void *arg1, int waitflag)
for (n = m, m->m_pkthdr.len = 0; n != NULL; n = n->m_next)
m->m_pkthdr.len += n->m_len;
/* Put peer's socket address (if any) into a meta info blob */
/* Put peer's socket address (if any) into a tag */
if (sa != NULL) {
struct meta_field_header *mhead;
u_int len;
struct sa_tag *stag;
len = sizeof(*meta) + sizeof(*mhead) + sa->sa_len;
MALLOC(meta, meta_p, len, M_NETGRAPH_META,
M_NOWAIT | M_ZERO);
if (meta == NULL) {
stag = (struct sa_tag *)m_tag_alloc(NGM_KSOCKET_COOKIE,
NG_KSOCKET_TAG_SOCKADDR, sa->sa_len, M_NOWAIT);
if (stag == NULL) {
FREE(sa, M_SONAME);
goto sendit;
}
mhead = &meta->options[0];
meta->allocated_len = len;
meta->used_len = len;
mhead->cookie = NGM_KSOCKET_COOKIE;
mhead->type = NG_KSOCKET_META_SOCKADDR;
mhead->len = sizeof(*mhead) + sa->sa_len;
bcopy(sa, mhead->data, sa->sa_len);
bcopy(sa, &stag->sa, sa->sa_len);
FREE(sa, M_SONAME);
m_tag_prepend(m, &stag->tag);
}
sendit: /* Forward data with optional peer sockaddr as meta info */
NG_SEND_DATA(error, priv->hook, m, meta);
sendit: /* Forward data with optional peer sockaddr as packet tag */
NG_SEND_DATA_ONLY(error, priv->hook, m);
}
/*

10
sys/netgraph/ng_ksocket.h
View File

@ -94,7 +94,13 @@ enum {
NGM_KSOCKET_GETOPT,
};
/* Meta information ID's */
#define NG_KSOCKET_META_SOCKADDR 1 /* data is struct sockaddr */
/* Structure for sockaddr tag */
struct sa_tag {
struct m_tag tag;
struct sockaddr sa;
};
/* Tag information ID's */
#define NG_KSOCKET_TAG_SOCKADDR 1 /* data is struct sockaddr */
#endif /* _NETGRAPH_NG_KSOCKET_H_ */

26
sys/netgraph/ng_lmi.c
View File

@ -306,14 +306,13 @@ nglmi_startup(sc_p sc)
sc->handle = timeout(LMI_ticker, sc, hz);
}
#define META_PAD 16
static void
nglmi_inquire(sc_p sc, int full)
{
struct mbuf *m;
struct ng_tag_prio *ptag;
char *cptr, *start;
int error;
meta_p meta = NULL;
if (sc->lmi_channel == NULL)
return;
@ -323,17 +322,18 @@ nglmi_inquire(sc_p sc, int full)
return;
}
m->m_pkthdr.rcvif = NULL;
/* Allocate a meta struct (and leave some slop for options to be
* added by other modules). */
MALLOC(meta, meta_p, sizeof(*meta) + META_PAD, M_NETGRAPH_META, M_NOWAIT);
if (meta != NULL) { /* if it failed, well, it was optional anyhow */
meta->used_len = (u_short) sizeof(struct ng_meta);
meta->allocated_len
= (u_short) sizeof(struct ng_meta) + META_PAD;
meta->flags = 0;
meta->priority = NG_LMI_LMI_PRIORITY;
meta->discardability = -1;
/* Attach a tag to packet, marking it of link level state priority, so
* that device driver would put it in the beginning of queue */
ptag = (struct ng_tag_prio *)m_tag_alloc(NGM_GENERIC_COOKIE, NG_TAG_PRIO,
(sizeof(struct ng_tag_prio) - sizeof(struct m_tag)), M_NOWAIT);
if (ptag != NULL) { /* if it failed, well, it was optional anyhow */
ptag->priority = NG_PRIO_LINKSTATE;
ptag->discardability = -1;
m_tag_prepend(m, &ptag->tag);
}
m->m_data += 4; /* leave some room for a header */
cptr = start = mtod(m, char *);
/* add in the header for an LMI inquiry. */
@ -371,7 +371,7 @@ nglmi_inquire(sc_p sc, int full)
/* Send it */
m->m_len = m->m_pkthdr.len = cptr - start;
NG_SEND_DATA(error, sc->lmi_channel, m, meta);
NG_SEND_DATA_ONLY(error, sc->lmi_channel, m);
/* If we've been sending requests for long enough, and there has
* been no response, then mark as DOWN, any DLCIs that are UP. */

1
sys/netgraph/ng_parse.c
View File

@ -46,6 +46,7 @@
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/ctype.h>
#include <net/ethernet.h>