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Give a chance for packet to appear with a correct input interfaces

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in case of multiple interfaces with the same MAC in the same bridge.
This commit do not solve the entire problem. Only case where packet
arrived from such interface.

PR:     kern/109815
MFC after:      7 days
Submitted by:   Eygene Ryabinkin and rik@
Discussed with: bms@, thompsa@, yar@
This commit is contained in:
Roman Kurakin 2007-03-18 23:28:53 +00:00
parent 27f8eaaf03
commit 3d0a65c88d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=167683
1 changed files with 50 additions and 30 deletions
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80
sys/net/if_bridge.c
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@ -2119,42 +2119,62 @@ bridge_input(struct ifnet *ifp, struct mbuf *m)
return (m);
}
#ifdef DEV_CARP
# define OR_CARP_CHECK_WE_ARE_DST(iface) \
|| ((iface)->if_carp \
&& carp_forus((iface)->if_carp, eh->ether_dhost))
# define OR_CARP_CHECK_WE_ARE_SRC(iface) \
|| ((iface)->if_carp \
&& carp_forus((iface)->if_carp, eh->ether_shost))
#else
# define OR_CARP_CHECK_WE_ARE_DST(iface)
# define OR_CARP_CHECK_WE_ARE_SRC(iface)
#endif
#define GRAB_OUR_PACKETS(iface) \
if ((iface)->if_type == IFT_GIF) \
continue; \
/* It is destined for us. */ \
if (memcmp(IF_LLADDR((iface)), eh->ether_dhost, ETHER_ADDR_LEN) == 0 \
OR_CARP_CHECK_WE_ARE_DST((iface)) \
) { \
if (bif->bif_flags & IFBIF_LEARNING) \
(void) bridge_rtupdate(sc, \
eh->ether_shost, bif, 0, IFBAF_DYNAMIC); \
m->m_pkthdr.rcvif = iface; \
BRIDGE_UNLOCK(sc); \
return (m); \
} \
\
/* We just received a packet that we sent out. */ \
if (memcmp(IF_LLADDR((iface)), eh->ether_shost, ETHER_ADDR_LEN) == 0 \
OR_CARP_CHECK_WE_ARE_SRC((iface)) \
) { \
BRIDGE_UNLOCK(sc); \
m_freem(m); \
return (NULL); \
}
/*
* Unicast. Make sure it's not for us.
*
* Give a chance for ifp at first priority. This will help when the
* packet comes through the interface like VLAN's with the same MACs
* on several interfaces from the same bridge. This also will save
* some CPU cycles in case the destination interface and the input
* interface (eq ifp) are the same.
*/
LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
if (bif2->bif_ifp->if_type == IFT_GIF)
continue;
/* It is destined for us. */
if (memcmp(IF_LLADDR(bif2->bif_ifp), eh->ether_dhost,
ETHER_ADDR_LEN) == 0
#ifdef DEV_CARP
|| (bif2->bif_ifp->if_carp
&& carp_forus(bif2->bif_ifp->if_carp, eh->ether_dhost))
#endif
) {
if (bif->bif_flags & IFBIF_LEARNING)
(void) bridge_rtupdate(sc,
eh->ether_shost, bif, 0, IFBAF_DYNAMIC);
m->m_pkthdr.rcvif = bif2->bif_ifp;
BRIDGE_UNLOCK(sc);
return (m);
}
do { GRAB_OUR_PACKETS(ifp) } while (0);
/* We just received a packet that we sent out. */
if (memcmp(IF_LLADDR(bif2->bif_ifp), eh->ether_shost,
ETHER_ADDR_LEN) == 0
#ifdef DEV_CARP
|| (bif2->bif_ifp->if_carp
&& carp_forus(bif2->bif_ifp->if_carp, eh->ether_shost))
#endif
) {
BRIDGE_UNLOCK(sc);
m_freem(m);
return (NULL);
}
/* Now check the all bridge members. */
LIST_FOREACH(bif2, &sc->sc_iflist, bif_next) {
GRAB_OUR_PACKETS(bif2->bif_ifp)
}
#undef OR_CARP_CHECK_WE_ARE_DST
#undef OR_CARP_CHECK_WE_ARE_SRC
#undef GRAB_OUR_PACKETS
/* Perform the bridge forwarding function. */
bridge_forward(sc, m);