* The standard is unclear about what should happen in case a mesh STA (not
marked as a mesh gate) recevies a PREQ for a destination that is marked
as proxy. Solution for now is not to do intermediate reply at all, and
let the PREQ reach the mesh gate;
Approved by: adrian (mentor)
* Original PREP frame is transmitted only by the target mesh STA or the
mesh STA that is the proxy target;
* Fixed so that metric value is not over written incorrectly in
hwmp_recv_preq for when replying back with a PREP;
Approved by: adrian (mentor)
This is a code re-write. ic->raw_xmit need a pointer to ieee80211_node
for the destination node (da). I have reorganized the code so that
a pointer to the da node is searched for in the end & in one place.
* Make mesh_find_txnode public to be used by HWMP, renamed to
ieee80211_mesh_finx_txnode;
* changed the argument from ieee80211_node to ieee80211vap for all
hwmp_send_* functions;
* removed the 'sa' argument from hwmp_send_* functions as all HWMP frames
have the source address equal to vap->iv_myaddr;
* Modified hwmp_send_action so that if da is MULTCAST ni=vap->iv_bss
otherwise we called ieee80211_mesh_find_txnode. Also no need to hold
a reference in this functions if da is not MULTICAST as by finding the
node it became referenced in ieee80211_find_txnode;
Approved by: adrian (mentor)
* Modified mesh_find_txnode to be able to handle proxy marked entries by
recursively calling itself to find the txnode towards the active mesh gate;
* Mesh Gate: Added a new function that transmits data frames
similar to ieee80211_start;
* Modified ieee80211_mesh_forward_to_gates so that:
+ Frames are duplicated and sent to each valid Mesh Gate;
+ Route is marked invalid before return of function, this is
because we dont know yet which Mesh Gate is we will use;
Approved by: adrian (mentor)
* Send frames that have no path to a known valid Mesh Gate;
* Added the function ieee80211_mesh_forward_to_gates that sends the frame
to the first found Mesh Gate in the forwarding information;
* If we try to discover again while we are discovering queue frame,
the discovery callout will send the frames either to mesh gates
or discards them silently;
* Queue frame also if we try to discover to frequently;
Approved by: adrian (mentor)
* Add function ieee80211_mesh_mark_gate in ieee80211_mesh.h;
* When received a proactive PREQ or RANN with corresponding mesh gate
flag set, create a new entry in the known mesh gate list;
Approved by: adrian (mentor)
* Modified mesh_recv_action_meshgate to do following:
+ if mesh STA already knows the mesh gate of the recevied GANN frame
+ if mesh gate is know, check seq number according to 802.11 standard
+ if mesh gate is not know, add it to the list of known mesh gates
+ if forwarding is enabled and ttl >= 1 then propagate the GANN frame;
* Declare a new malloc type M_80211_MESH_GT_RT;
* Declare a struct to store GANN information, ieee80211_mesh_gate_route. And
add it as a TAILQ list to ieee80211_mesh_state;
Approved by: adrian (mentor)
A Mesh Gate should transmit a Mesh Action frame containing
ieee80211_meshgann_ie as its only information element periodically
every ieee80211_mesh_gateint ms. Unless the mesh gate is also configure
as a ROOT, then these frames should not be send.
This is according to 802.11 2012 standard;
* Introduce new SYSCTL net.wlan.mesh.gateint, with 10s default;
* Add two new functions mesh_gatemode_setup and mesh_gatemode_cb. This
is similar to how HWMP setups up a callout;
* Add two new action handlers mesh_recv_action_meshgate and
mesh_send_action_meshgate;
* Added ieee80211_add_meshgate to ieee80211_mesh.h;
* Modified mesh_send_action to look similar to hwmp_send_action. This is
because we need to send out broadcast management frames.
* Introduced a new flag for mesh state IEEE80211_MESHFLAGS_ROOT. This flag
is now set by HWMP code when a mesh STA is configured as a ROOT. This
is then checked by mesh_gatemode_cb before scheduling a new callout;
* Added to new field to ieee80211_mesh_state:
+ struct callout ms_gatetimer
+ ieee80211_mesh_seq ms_gateseq;
Approved by: adrian (mentor)
when not peered.
* Modified ieee80211_recv_action to check if neighbour is peered for
IEEE80211_ACTION_CAT_MESH frames, if not frame is discarded. This is
according to IEEE802.11 2012 standard;
* Removed duplicate checks in each hwmp_recv_* handlers because HWMP
is a subtype of mesh action;
Approved by: adrian (mentor)
* Removed meshlm_send_action and hwmp_send_action. Introduced one common
for all Mesh Action frames meshaction_send_action. According to 802.11
standard Link Metric and HWMP are all under Mesh Action category;
* Did similar changes to recv_action part;
* The size of meshaction_*_action is set to 12. This is to make room for
the rest of Mesh Action category subtypes;
Approved by: adrian (mentor)
* Change all field prefix from pann_ to gann_;
* Added IEEE80211_MESHGANN_BASE_SZ macro to be used in the length field
of a GANN frame according to 802.11 standard;
* Changed gann_seq field type to uint32_t;
* Added a Gate Announcement interval field according to
IEEE802.11 2012 standard;
* Added IEEE80211_MESHRT_FLAGS_GATE as flag bit to ieee80211_mesh_route;
* Added IEEE80211_MESHRT_FLAGS_GATE as flag bit to ieee80211req_mesh_route;
Approved by: adrian (mentor)
* An HWMP PERR should be accepted even if path is valid. Because
we check if we recevied it from a neighbour that we use as a next hop;
Approved by: adrian (mentor)
* A bug occurs while in discovery mode which leaves a path marked with
both Discover and Valid flag. This happens when receiving/sending
PREQ and PREP in a particular order. Solution is to assign the Valid bit
instead of oring it;
Approved by: adrian (mentor)
This problem happens when using ACL policy to filter mesh STA
but two nodes have different policy. Then one of them will try to
peer all the time. This can also help if for any reason one of the
peering mesh STA have problems sending/receiving peer frames.
* Modified struct ieee80211_node to include two new fields:
+ struct callout ni_mlhtimer /* link mesh backoff timer */
+ uint8_t ni_mlhcnt /* link mesh holding counter */
* Added two new sysctl (check sysctl -d for more info):
+ net.wlan.mesh.backofftimeout=5000
+ net.wlan.mesh.maxholding=2;
* When receiving a beacon and we are in IEEE80211_NODE_MESH_IDLE
check if ni_mlhcnt >= ieee80211_mesh_maxholding, if so do not do anything;
* In mesh_peer_timeout_cb when transitioning from IEEE80211_NODE_MESH_HOLDING
to IEEE80211_NODE_MESH_IDLE increment ni_mlhcnt, and eventually start
ieee80211_mesh_backofftimeout;
Approved by: adrian (mentor)
until child performs exec(). The behaviour is reasonable when a
debugger is the real parent, because the parent is stopped until
exec(), and sending a debugging event to the debugger would deadlock
both parent and child.
On the other hand, when debugger is not the parent of the vforked
child, not sending debugging signals makes it impossible to debug
across vfork.
Fix the issue by declining generating debug signals only when vfork()
was done and child called ptrace(PT_TRACEME). Set a new process flag
P_PPTRACE from the attach code for PT_TRACEME, if P_PPWAIT flag is
set, which indicates that the process was created with vfork() and
still did not execed. Check P_PPTRACE from issignal(), instead of
refusing the trace outright for the P_PPWAIT case. The scope of
P_PPTRACE is exactly contained in the scope of P_PPWAIT.
Found and tested by: zont
Reviewed by: pluknet
MFC after: 2 weeks
of the newer drivers. The basic problem was
that the driver was pulling the mbuf off the
drbr ring and then when sending with xmit(), encounting
a full transmit ring. Thus the lower layer
xmit() function would return an error, and the
drivers would then append the data back on to the ring.
For TCP this is a horrible scenario sure to bring
on a fast-retransmit.
The fix is to use drbr_peek() to pull the data pointer
but not remove it from the ring. If it fails then
we either call the new drbr_putback or drbr_advance
method. Advance moves it forward (we do this sometimes
when the xmit() function frees the mbuf). When
we succeed we always call advance. The
putback will always copy the mbuf back to the top
of the ring. Note that the putback *cannot* be used
with a drbr_dequeue() only with drbr_peek(). We most
of the time, in putback, would not need to copy it
back since most likey the mbuf is still the same, but
sometimes xmit() functions will change the mbuf via
a pullup or other call. So the optimial case for
the single consumer is to always copy it back. If
we ever do a multiple_consumer (for lagg?) we
will need a test and atomic in the put back possibly
a seperate putback_mc() in the ring buf.
Reviewed by: jhb@freebsd.org, jlv@freebsd.org
Posix requires that open(2) is restartable for SA_RESTART.
For non-posix objects, in particular, devfs nodes, still disable
automatic restart of the opens. The open call to a driver could have
significant side effects for the hardware.
Noted and reviewed by: jilles
Discussed with: bde
MFC after: 2 weeks
cpuset mask for the associated interrupt thread.
The text used above is verbatim from r195249 and the code should now be
in line with the intent of that commit.
