The packet filter may reassemble the ip fragments and return a packet that is
larger than the MTU of the sending interface. There is no check for DF or icmp
replies as we can only get a large packet to fragment by reassembling a
previous fragment, and this only happens after a call to pfil(9).
Obtained from: OpenBSD (mostly)
Glanced at by: mlaier
MFC after: 1 month
details see PR kern/94448.
PR: kern/94448
Original patch: Eygene A. Ryabinkin <rea-fbsd at rea dot mbslab dot kiae dot ru>Final patch: thompsa@
Tested by: thompsa@, Eygene A. Ryabinkin
MFC after: 7 days
that we might have address collisions, so make sure that this hardware address
isn't already in use on another bridge.
Submitted by: csjp
MFC after: 1 month
destination interface as a member of our bridge or this is a unicast packet,
push it through the bpf(4) machinery.
For broadcast or multicast packets, don't bother with the bpf(4) because it will
be re-injected into ether_input. We do this before we pass the packets through
the pfil(9) framework, as it is possible that pfil(9) will drop the packet or
possibly modify it, making it very difficult to debug firewall issues on the
bridge.
Further, implemented IFF_MONITOR for bridge interfaces. This does much the same
thing that it does for regular network interfaces: it pushes the packet to any
bpf(4) peers and then returns. This bypasses all of the bridge machinery,
saving mutex acquisitions, list traversals, and other operations performed by
the bridging code.
This change to the bridging code is useful in situations where individuals use a
bridge to multiplex RX/TX signals from two interfaces, as is required by some
network taps for de-multiplexing links and transmitting the RX/TX signals
out through two separate interfaces. This behaviour is quite common for network
taps monitoring links, especially for certain manufacturers.
Reviewed by: thompsa
MFC after: 1 month
Sponsored by: Seccuris Labs
- code expects memcmp() to return a signed value, our memcmp() returns 0 if
args are equal and > 0 if not.
- It's possible to hijack interface for static entry. If bridge recieves
packet from interface marked as learning it will replace the bridge_rtnode
entry for the source address even if such entry marked as static.
Submitted by: Gleb Kurtsov <k-gleb yandex.ru>
MFC after: 3 days
restored when its removed from the bridge.
At the moment we only clear IFCAP_TXCSUM. Since a locally generated packet on
the bridge may be sent out any one or more interfaces it cant be assumed that
every card does hardware csums. Most bridges don't generate a lot of traffic
themselves so turning off offloading won't hurt, bridged packets are
unaffected.
Tested by: Bruce Walker (bmw borderware.com)
MFC after: 5 days
ETHERTYPE_IPV6 frames. Change this to be a sysctl knob so that is able to still
bridge non-IP packets if desired.
Also return early if all pfil_* sysctls are turned off, the user obviously does
not want to filter on the bridge.
interfaces to bridges, which will then send and receive IP protocol 97 packets.
Packets are Ethernet frames with an EtherIP header prepended.
Obtained from: NetBSD
MFC after: 2 weeks
span ports when they disappear. The span port does not have a pointer to the
softc so revert r1.31 and bring back the softc linked-list.
MFC after: 2 weeks
If the packet is rejected from pfil(9) then continue the loop rather than
returning, this means that we can still try to send it out the remaining
interfaces but more importantly the mbuf is freed and refcount decremented on
exit.
rather than in ifindex_table[]; all (except one) accesses are
through ifp anyway. IF_LLADDR() works faster, and all (except
one) ifaddr_byindex() users were converted to use ifp->if_addr.
- Stop storing a (pointer to) Ethernet address in "struct arpcom",
and drop the IFP2ENADDR() macro; all users have been converted
to use IF_LLADDR() instead.
softc lists and associated mutex are now unused so these have been removed.
Calling if_clone_detach() will now destroy all the cloned interfaces for the
driver and in most cases is all thats needed to unload.
Idea by: brooks
Reviewed by: brooks
promisc flag from the member interface, this is a no-op anyway since the
interface is disappearing. The driver may have already released
its resources such as miibus and this is likely to panic the kernel.
Submitted and tested by: Wojciech A. Koszek
MFC after: 2 weeks
that the following funtions are not used, wrap in '#ifdef noused' for the
moment.
bstp_enable_change_detection
bstp_disable_change_detection
bstp_set_bridge_priority
bstp_set_port_priority
bstp_set_path_cost
- move the function pointer definitions to if_bridgevar.h
- move most of the logic to the new BRIDGE_INPUT and BRIDGE_OUTPUT macros
- remove unneeded functions from if_bridgevar.h and sort a little.
Use bridge_ifdetach() to notify the bridge that a member has been detached. The
bridge can then remove it from its interface list and not try to send out via a
dead pointer.
cloner. This ensures that ifc->ifc_units is not prematurely freed in
if_clone_detach() before the clones are destroyed, resulting in memory modified
after free. This could be triggered with if_vlan.
Assert that all cloners have been destroyed when freeing the memory.
Change all simple cloners to destroy their clones with ifc_simple_destroy() on
module unload so the reference count is properly updated. This also cleans up
the interface destroy routines and allows future optimisation.
Discussed with: brooks, pjd, -current
Reviewed by: brooks
copied mbuf, which keeps the IP header 32-bit aligned. This copied mbuf is
reinjected back into ether_input and off to the IP routines.
Reported and tested by: Peter van Dijk
Approved by: mlaier (mentor)
MFC after: 3 days
assigned to the interface.
IPv6 auto-configuration is disabled. An IPv6 link-local address has a
link-local scope within one link, the spec is unclear for the bridge case and
it may cause scope violation.
An address can be assigned in the usual way;
ifconfig bridge0 inet6 xxxx:...
Tested by: bmah
Reviewed by: ume (netinet6)
Approved by: mlaier (mentor)
MFC after: 1 week
attached.
This is caused by bpf_detachd clearing IFF_PROMISC on the interface which does
a SIOCSIFFLAGS ioctl. The problem here is that while the interface has been
stopped, IFF_UP has not been cleared so IFF_UP != IFF_DRV_RUNNING, this causes
the ioctl function to init() the interface which resets the callouts.
The destroy then completes and frees the softc but softclock will panic on a
dead callout pointer.
Ensure ifp->if_flags matches reality by clearing IFF_UP when we destroy.
Silence from: rwatson
Approved by: mlaier (mentor)
MFC after: 3 days
actually 1514, so comparing the mbuf length which includes the Ethernet header
to the interface MTU is wrong.
The check was a little over the top so just remove it.
Approved by: mlaier (mentor)
MFC after: 3 days
could initialise while unlocked if the bridge is not up when setting the inet
address, ether_ioctl() would call bridge_init.
Change it so bridge_init is always called unlocked and then locks before
calling bstp_initialization().
Reported by: Michal Mertl
Approved by: mlaier (mentor)
MFC after: 3 days
IFF_DRV_RUNNING, as well as the move from ifnet.if_flags to
ifnet.if_drv_flags. Device drivers are now responsible for
synchronizing access to these flags, as they are in if_drv_flags. This
helps prevent races between the network stack and device driver in
maintaining the interface flags field.
Many __FreeBSD__ and __FreeBSD_version checks maintained and continued;
some less so.
Reviewed by: pjd, bz
MFC after: 7 days
m_copym(m, 0, M_COPYALL, how).
This is required for strict alignment architectures where we align the IP
header in the input path but m_copym() will create an unaligned copy in
bridge_broadcast(). m_copypacket() preserves alignment of the first mbuf.
Noticed by: Petri Simolin
Approved by: mlaier (mentor)
MFC after: 3 days
bridge but the interface can still be changed afterwards.
This falls under the 'dont do that' category but log an warning when INVARIANTS
is defined.
Approved by: mlaier (mentor)
MFC after: 3 days
we can only bridge interfaces with the same value it meant that all members had
to be set at ETHERMTU as well.
Allow the first member to be added to define the MTU for the bridge, the check
still applies to all additional members.
Print an informative message if the MTU is incorrect [1]
Requested by: Niki Denev [1]
Approved by: mlaier (mentor)
MFC after: 3 days
