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Allow ng_ether "lower" and "orphans" hooks to be connected at the same time. 

Reviewed by:	julian
PR:		kern/63317
This commit is contained in:
Archie Cobbs 2004-05-16 19:31:35 +00:00
parent f5896baf9c
commit 1a292b8015
2 changed files with 25 additions and 47 deletions
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10
share/man/man4/ng_ether.4
View File

@ -97,12 +97,12 @@ The
hook is equivalent to
.Va lower ,
except that only unrecognized packets (that would otherwise be discarded)
are written to the hook, and normal incoming traffic is unaffected.
At most one of
are written to the hook, while other normal incoming traffic is unaffected.
Unrecognized packets written to
.Va upper
will be forwarded back out to
.Va orphans
and
.Va lower
may be connected at any time.
if connected.
.Pp
In all cases, frames are raw Ethernet frames with the standard
14 byte Ethernet header (but no checksum).

62
sys/netgraph/ng_ether.c
View File

@ -70,8 +70,8 @@
struct private {
struct ifnet *ifp; /* associated interface */
hook_p upper; /* upper hook connection */
hook_p lower; /* lower OR orphan hook connection */
u_char lowerOrphan; /* whether lower is lower or orphan */
hook_p lower; /* lower hook connection */
hook_p orphan; /* orphan hook connection */
u_char autoSrcAddr; /* always overwrite source address */
u_char promisc; /* promiscuous mode enabled */
u_long hwassist; /* hardware checksum capabilities */
@ -94,7 +94,6 @@ static void ng_ether_attach(struct ifnet *ifp);
static void ng_ether_detach(struct ifnet *ifp);
/* Other functions */
static void ng_ether_input2(node_p node, struct mbuf **mp);
static int ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta);
static int ng_ether_rcv_upper(node_p node, struct mbuf *m, meta_p meta);
@ -201,11 +200,12 @@ ng_ether_input(struct ifnet *ifp, struct mbuf **mp)
{
const node_p node = IFP2NG(ifp);
const priv_p priv = NG_NODE_PRIVATE(node);
int error;
/* If "lower" hook not connected, let packet continue */
if (priv->lower == NULL || priv->lowerOrphan)
if (priv->lower == NULL)
return;
ng_ether_input2(node, mp);
NG_SEND_DATA_ONLY(error, priv->lower, *mp); /* sets *mp = NULL */
}
/*
@ -219,33 +219,14 @@ ng_ether_input_orphan(struct ifnet *ifp, struct mbuf *m)
{
const node_p node = IFP2NG(ifp);
const priv_p priv = NG_NODE_PRIVATE(node);
int error;
/* If "orphan" hook not connected, let packet continue */
if (priv->lower == NULL || !priv->lowerOrphan) {
/* If "orphan" hook not connected, discard packet */
if (priv->orphan == NULL) {
m_freem(m);
return;
}
ng_ether_input2(node, &m);
if (m != NULL)
m_freem(m);
}
/*
* Handle a packet that has come in on an ethernet interface.
* The Ethernet header has already been detached from the mbuf,
* so we have to put it back.
*
* NOTE: this function will get called at splimp()
*/
static void
ng_ether_input2(node_p node, struct mbuf **mp)
{
const priv_p priv = NG_NODE_PRIVATE(node);
int error;
/* Send out lower/orphan hook */
NG_SEND_DATA_ONLY(error, priv->lower, *mp);
*mp = NULL;
NG_SEND_DATA_ONLY(error, priv->orphan, m);
}
/*
@ -352,7 +333,6 @@ static int
ng_ether_newhook(node_p node, hook_p hook, const char *name)
{
const priv_p priv = NG_NODE_PRIVATE(node);
u_char orphan = priv->lowerOrphan;
hook_p *hookptr;
/* Divert hook is an alias for lower */
@ -362,13 +342,11 @@ ng_ether_newhook(node_p node, hook_p hook, const char *name)
/* Which hook? */
if (strcmp(name, NG_ETHER_HOOK_UPPER) == 0)
hookptr = &priv->upper;
else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0) {
else if (strcmp(name, NG_ETHER_HOOK_LOWER) == 0)
hookptr = &priv->lower;
orphan = 0;
} else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0) {
hookptr = &priv->lower;
orphan = 1;
} else
else if (strcmp(name, NG_ETHER_HOOK_ORPHAN) == 0)
hookptr = &priv->orphan;
else
return (EINVAL);
/* Check if already connected (shouldn't be, but doesn't hurt) */
@ -381,7 +359,6 @@ ng_ether_newhook(node_p node, hook_p hook, const char *name)
/* OK */
*hookptr = hook;
priv->lowerOrphan = orphan;
return (0);
}
@ -514,18 +491,18 @@ ng_ether_rcvdata(hook_p hook, item_p item)
NGI_GET_M(item, m);
NGI_GET_META(item, meta);
NG_FREE_ITEM(item);
if (hook == priv->lower)
if (hook == priv->lower || hook == priv->orphan)
return ng_ether_rcv_lower(node, m, meta);
if (hook == priv->upper)
return ng_ether_rcv_upper(node, m, meta);
panic("%s: weird hook", __func__);
#ifdef RESTARTABLE_PANICS /* so we don;t get an error msg in LINT */
#ifdef RESTARTABLE_PANICS /* so we don't get an error msg in LINT */
return NULL;
#endif
}
/*
* Handle an mbuf received on the "lower" hook.
* Handle an mbuf received on the "lower" or "orphan" hook.
*/
static int
ng_ether_rcv_lower(node_p node, struct mbuf *m, meta_p meta)
@ -629,10 +606,11 @@ ng_ether_disconnect(hook_p hook)
priv->upper = NULL;
if (priv->ifp != NULL) /* restore h/w csum */
priv->ifp->if_hwassist = priv->hwassist;
} else if (hook == priv->lower) {
} else if (hook == priv->lower)
priv->lower = NULL;
priv->lowerOrphan = 0;
} else
else if (hook == priv->orphan)
priv->orphan = NULL;
else
panic("%s: weird hook", __func__);
if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0)
&& (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))