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2018-04-27tipc: fix bug in function tipc_nl_node_dump_monitorJon Maloy
Commit 36a50a989ee8 ("tipc: fix infinite loop when dumping link monitor summary") intended to fix a problem with user tool looping when max number of bearers are enabled. Unfortunately, the wrong version of the commit was posted, so the problem was not solved at all. This commit adds the missing part. Fixes: 36a50a989ee8 ("tipc: fix infinite loop when dumping link monitor summary") Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-18tipc: fix infinite loop when dumping link monitor summaryTung Nguyen
When configuring the number of used bearers to MAX_BEARER and issuing command "tipc link monitor summary", the command enters infinite loop in user space. This issue happens because function tipc_nl_node_dump_monitor() returns the wrong 'prev_bearer' value when all potential monitors have been scanned. The correct behavior is to always try to scan all monitors until either the netlink message is full, in which case we return the bearer identity of the affected monitor, or we continue through the whole bearer array until we can return MAX_BEARERS. This solution also caters for the case where there may be gaps in the bearer array. Signed-off-by: Tung Nguyen <tung.q.nguyen@dektech.com.au> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-18tipc: fix use-after-free in tipc_nametbl_stopJon Maloy
When we delete a service item in tipc_nametbl_stop() we loop over all service ranges in the service's RB tree, and for each service range we loop over its pertaining publications while calling tipc_service_remove_publ() for each of them. However, tipc_service_remove_publ() has the side effect that it also removes the comprising service range item when there are no publications left. This leads to a "use-after-free" access when the inner loop continues to the next iteration, since the range item holding the list we are looping no longer exists. We fix this by moving the delete of the service range item outside the said function. Instead, we now let the two functions calling it test if the list is empty and perform the removal when that is the case. Reported-by: syzbot+d64b64afc55660106556@syzkaller.appspotmail.com Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-16tipc: fix possible crash in __tipc_nl_net_set()Eric Dumazet
syzbot reported a crash in __tipc_nl_net_set() caused by NULL dereference. We need to check that both TIPC_NLA_NET_NODEID and TIPC_NLA_NET_NODEID_W1 are present. We also need to make sure userland provided u64 attributes. Fixes: d50ccc2d3909 ("tipc: add 128-bit node identifier") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Jon Maloy <jon.maloy@ericsson.com> Cc: Ying Xue <ying.xue@windriver.com> Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-16tipc: add policy for TIPC_NLA_NET_ADDREric Dumazet
Before syzbot/KMSAN bites, add the missing policy for TIPC_NLA_NET_ADDR Fixes: 27c21416727a ("tipc: add net set to new netlink api") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Jon Maloy <jon.maloy@ericsson.com> Cc: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-12tipc: fix missing initializer in tipc_sendmsg()Jon Maloy
The stack variable 'dnode' in __tipc_sendmsg() may theoretically end up tipc_node_get_mtu() as an unitilalized variable. We fix this by intializing the variable at declaration. We also add a default else clause to the two conditional ones already there, so that we never end up in the named function if the given address type is illegal. Reported-by: syzbot+b0975ce9355b347c1546@syzkaller.appspotmail.com Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-12tipc: fix unbalanced reference counterJon Maloy
When a topology subscription is created, we may encounter (or KASAN may provoke) a failure to create a corresponding service instance in the binding table. Instead of letting the tipc_nametbl_subscribe() report the failure back to the caller, the function just makes a warning printout and returns, without incrementing the subscription reference counter as expected by the caller. This makes the caller believe that the subscription was successful, so it will at a later moment try to unsubscribe the item. This involves a sub_put() call. Since the reference counter never was incremented in the first place, we get a premature delete of the subscription item, followed by a "use-after-free" warning. We fix this by adding a return value to tipc_nametbl_subscribe() and make the caller aware of the failure to subscribe. This bug seems to always have been around, but this fix only applies back to the commit shown below. Given the low risk of this happening we believe this to be sufficient. Fixes: commit 218527fe27ad ("tipc: replace name table service range array with rb tree") Reported-by: syzbot+aa245f26d42b8305d157@syzkaller.appspotmail.com Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-08tipc: use the right skb in tipc_sk_fill_sock_diag()Cong Wang
Commit 4b2e6877b879 ("tipc: Fix namespace violation in tipc_sk_fill_sock_diag") tried to fix the crash but failed, the crash is still 100% reproducible with it. In tipc_sk_fill_sock_diag(), skb is the diag dump we are filling, it is not correct to retrieve its NETLINK_CB(), instead, like other protocol diag, we should use NETLINK_CB(cb->skb).sk here. Reported-by: <syzbot+326e587eff1074657718@syzkaller.appspotmail.com> Fixes: 4b2e6877b879 ("tipc: Fix namespace violation in tipc_sk_fill_sock_diag") Fixes: c30b70deb5f4 (tipc: implement socket diagnostics for AF_TIPC) Cc: GhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@ericsson.com> Cc: Jon Maloy <jon.maloy@ericsson.com> Cc: Ying Xue <ying.xue@windriver.com> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-04tipc: Fix namespace violation in tipc_sk_fill_sock_diagGhantaKrishnamurthy MohanKrishna
To fetch UID info for socket diagnostics, we determine the namespace of user context using tipc socket instance. This may cause namespace violation, as the kernel will remap based on UID. We fix this by fetching namespace info using the calling userspace netlink socket. Fixes: c30b70deb5f4 (tipc: implement socket diagnostics for AF_TIPC) Reported-by: syzbot+326e587eff1074657718@syzkaller.appspotmail.com Acked-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: GhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-04-04tipc: Fix missing list initializations in struct tipc_subscriptionJon Maloy
When an item of struct tipc_subscription is created, we fail to initialize the two lists aggregated into the struct. This has so far never been a problem, since the items are just added to a root object by list_add(), which does not require the addee list to be pre-initialized. However, syzbot is provoking situations where this addition fails, whereupon the attempted removal if the item from the list causes a crash. This problem seems to always have been around, despite that the code for creating this object was rewritten in commit 242e82cc95f6 ("tipc: collapse subscription creation functions"), which is still in net-next. We fix this for that commit by initializing the two lists properly. Fixes: 242e82cc95f6 ("tipc: collapse subscription creation functions") Reported-by: syzbot+0bb443b74ce09197e970@syzkaller.appspotmail.com Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-31tipc: avoid possible string overflowJon Maloy
gcc points out that the combined length of the fixed-length inputs to l->name is larger than the destination buffer size: net/tipc/link.c: In function 'tipc_link_create': net/tipc/link.c:465:26: error: '%s' directive writing up to 32 bytes into a region of size between 26 and 58 [-Werror=format-overflow=] sprintf(l->name, "%s:%s-%s:unknown", self_str, if_name, peer_str); net/tipc/link.c:465:2: note: 'sprintf' output 11 or more bytes (assuming 75) into a destination of size 60 sprintf(l->name, "%s:%s-%s:unknown", self_str, if_name, peer_str); A detailed analysis reveals that the theoretical maximum length of a link name is: max self_str + 1 + max if_name + 1 + max peer_str + 1 + max if_name = 16 + 1 + 15 + 1 + 16 + 1 + 15 = 65 Since we also need space for a trailing zero we now set MAX_LINK_NAME to 68. Just to be on the safe side we also replace the sprintf() call with snprintf(). Fixes: 25b0b9c4e835 ("tipc: handle collisions of 32-bit node address hash values") Reported-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-31tipc: permit overlapping service ranges in name tableJon Maloy
With the new RB tree structure for service ranges it becomes possible to solve an old problem; - we can now allow overlapping service ranges in the table. When inserting a new service range to the tree, we use 'lower' as primary key, and when necessary 'upper' as secondary key. Since there may now be multiple service ranges matching an indicated 'lower' value, we must also add the 'upper' value to the functions used for removing publications, so that the correct, corresponding range item can be found. These changes guarantee that a well-formed publication/withdrawal item from a peer node never will be rejected, and make it possible to eliminate the problematic backlog functionality we currently have for handling such cases. Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-31tipc: refactor name table translate functionJon Maloy
The function tipc_nametbl_translate() function is ugly and hard to follow. This can be improved somewhat by introducing a stack variable for holding the publication list to be used and re-ordering the if- clauses for selection of algorithm. Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-31tipc: replace name table service range array with rb treeJon Maloy
The current design of the binding table has an unnecessary memory consuming and complex data structure. It aggregates the service range items into an array, which is expanded by a factor two every time it becomes too small to hold a new item. Furthermore, the arrays never shrink when the number of ranges diminishes. We now replace this array with an RB tree that is holding the range items as tree nodes, each range directly holding a list of bindings. This, along with a few name changes, improves both readability and volume of the code, as well as reducing memory consumption and hopefully improving cache hit rate. Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-27net: Drop pernet_operations::asyncKirill Tkhai
Synchronous pernet_operations are not allowed anymore. All are asynchronous. So, drop the structure member. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-27tipc: tipc_node_create() can be staticWei Yongjun
Fixes the following sparse warning: net/tipc/node.c:336:18: warning: symbol 'tipc_node_create' was not declared. Should it be static? Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Acked-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-27tipc: fix error handling in tipc_udp_enable()Wei Yongjun
Release alloced resource before return from the error handling case in tipc_udp_enable(), otherwise will cause memory leak. Fixes: 52dfae5c85a4 ("tipc: obtain node identity from interface by default") Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com> Acked-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-25tipc: tipc_disc_addr_trial_msg() can be statickbuild test robot
Fixes: 25b0b9c4e835 ("tipc: handle collisions of 32-bit node address hash values") Signed-off-by: Fengguang Wu <fengguang.wu@intel.com> Acked-by: Jon Maloy jon.maloy@ericsson.com Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-23tipc: obtain node identity from interface by defaultJon Maloy
Selecting and explicitly configuring a TIPC node identity may be unwanted in some cases. In this commit we introduce a default setting if the identity has not been set at the moment the first bearer is enabled. We do this by using a raw copy of a unique identifier from the used interface: MAC address in the case of an L2 bearer, IPv4/IPv6 address in the case of a UDP bearer. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-23tipc: handle collisions of 32-bit node address hash valuesJon Maloy
When a 32-bit node address is generated from a 128-bit identifier, there is a risk of collisions which must be discovered and handled. We do this as follows: - We don't apply the generated address immediately to the node, but do instead initiate a 1 sec trial period to allow other cluster members to discover and handle such collisions. - During the trial period the node periodically sends out a new type of message, DSC_TRIAL_MSG, using broadcast or emulated broadcast, to all the other nodes in the cluster. - When a node is receiving such a message, it must check that the presented 32-bit identifier either is unused, or was used by the very same peer in a previous session. In both cases it accepts the request by not responding to it. - If it finds that the same node has been up before using a different address, it responds with a DSC_TRIAL_FAIL_MSG containing that address. - If it finds that the address has already been taken by some other node, it generates a new, unused address and returns it to the requester. - During the trial period the requesting node must always be prepared to accept a failure message, i.e., a message where a peer suggests a different (or equal) address to the one tried. In those cases it must apply the suggested value as trial address and restart the trial period. This algorithm ensures that in the vast majority of cases a node will have the same address before and after a reboot. If a legacy user configures the address explicitly, there will be no trial period and messages, so this protocol addition is completely backwards compatible. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-23tipc: add 128-bit node identifierJon Maloy
We add a 128-bit node identity, as an alternative to the currently used 32-bit node address. For the sake of compatibility and to minimize message header changes we retain the existing 32-bit address field. When not set explicitly by the user, this field will be filled with a hash value generated from the much longer node identity, and be used as a shorthand value for the latter. We permit either the address or the identity to be set by configuration, but not both, so when the address value is set by a legacy user the corresponding 128-bit node identity is generated based on the that value. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-23tipc: remove direct accesses to own_addr field in struct tipc_netJon Maloy
As a preparation to changing the addressing structure of TIPC we replace all direct accesses to the tipc_net::own_addr field with the function dedicated for this, tipc_own_addr(). There are no changes to program logics in this commit. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-23tipc: allow closest-first lookup algorithm when legacy address is configuredJon Maloy
The removal of an internal structure of the node address has an unwanted side effect. - Currently, if a user is sending an anycast message with destination domain 0, the tipc_namebl_translate() function will use the 'closest- first' algorithm to first look for a node local destination, and only when no such is found, will it resort to the cluster global 'round- robin' lookup algorithm. - Current users can get around this, and enforce unconditional use of global round-robin by indicating a destination as Z.0.0 or Z.C.0. - This option disappears when we make the node address flat, since the lookup algorithm has no way of recognizing this case. So, as long as there are node local destinations, the algorithm will always select one of those, and there is nothing the sender can do to change this. We solve this by eliminating the 'closest-first' option, which was never a good idea anyway, for non-legacy users, but only for those. To distinguish between legacy users and non-legacy users we introduce a new flag 'legacy_addr_format' in struct tipc_core, to be set when the user configures a legacy-style Z.C.N node address. Hence, when a legacy user indicates a zero lookup domain 'closest-first' is selected, and in all other cases we use 'round-robin'. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-23tipc: remove restrictions on node address valuesJon Maloy
Nominally, TIPC organizes network nodes into a three-level network hierarchy consisting of the levels 'zone', 'cluster' and 'node'. This hierarchy is reflected in the node address format, - it is sub-divided into an 8-bit zone id, and 12 bit cluster id, and a 12-bit node id. However, the 'zone' and 'cluster' levels have in reality never been fully implemented,and never will be. The result of this has been that the first 20 bits the node identity structure have been wasted, and the usable node identity range within a cluster has been limited to 12 bits. This is starting to become a problem. In the following commits, we will need to be able to connect between nodes which are using the whole 32-bit value space of the node address. We therefore remove the restrictions on which values can be assigned to node identity, -it is from now on only a 32-bit integer with no assumed internal structure. Isolation between clusters is now achieved only by setting different values for the 'network id' field used during neighbor discovery, in practice leading to the latter becoming the new cluster identity. The rules for accepting discovery requests/responses from neighboring nodes now become: - If the user is using legacy address format on both peers, reception of discovery messages is subject to the legacy lookup domain check in addition to the cluster id check. - Otherwise, the discovery request/response is always accepted, provided both peers have the same network id. This secures backwards compatibility for users who have been using zone or cluster identities as cluster separators, instead of the intended 'network id'. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-23tipc: some cleanups in the file discover.cJon Maloy
To facilitate the coming changes in the neighbor discovery functionality we make some renaming and refactoring of that code. The functional changes in this commit are trivial, e.g., that we move the message sending call in tipc_disc_timeout() outside the spinlock protected region. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-23tipc: refactor function tipc_enable_bearer()Jon Maloy
As a preparation for the next commits we try to reduce the footprint of the function tipc_enable_bearer(), while hopefully making is simpler to follow. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-22tipc: step sk->sk_drops when rcv buffer is fullGhantaKrishnamurthy MohanKrishna
Currently when tipc is unable to queue a received message on a socket, the message is rejected back to the sender with error TIPC_ERR_OVERLOAD. However, the application on this socket has no knowledge about these discards. In this commit, we try to step the sk_drops counter when tipc is unable to queue a received message. Export sk_drops using tipc socket diagnostics. Acked-by: Jon Maloy <jon.maloy@ericsson.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: GhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@ericsson.com> Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-22tipc: implement socket diagnostics for AF_TIPCGhantaKrishnamurthy MohanKrishna
This commit adds socket diagnostics capability for AF_TIPC in netlink family NETLINK_SOCK_DIAG in a new kernel module (diag.ko). The following are key design considerations: - config TIPC_DIAG has default y, like INET_DIAG. - only requests with flag NLM_F_DUMP is supported (dump all). - tipc_sock_diag_req message is introduced to send filter parameters. - the response attributes are of TLV, some nested. To avoid exposing data structures between diag and tipc modules and avoid code duplication, the following additions are required: - export tipc_nl_sk_walk function to reuse socket iterator. - export tipc_sk_fill_sock_diag to fill the tipc diag attributes. - create a sock_diag response message in __tipc_add_sock_diag defined in diag.c and use the above exported tipc_sk_fill_sock_diag to fill response. Acked-by: Jon Maloy <jon.maloy@ericsson.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: GhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@ericsson.com> Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-22tipc: modify socket iterator for sock_diagGhantaKrishnamurthy MohanKrishna
The current socket iterator function tipc_nl_sk_dump, handles socket locks and calls __tipc_nl_add_sk for each socket. To reuse this logic in sock_diag implementation, we do minor modifications to make these functions generic as described below. In this commit, we add a two new functions __tipc_nl_sk_walk, __tipc_nl_add_sk_info and modify tipc_nl_sk_dump, __tipc_nl_add_sk accordingly. In __tipc_nl_sk_walk we: 1. acquire and release socket locks 2. for each socket, execute the specified callback function In __tipc_nl_add_sk we: - Move the netlink attribute insertion to __tipc_nl_add_sk_info. tipc_nl_sk_dump calls tipc_nl_sk_walk with __tipc_nl_add_sk as argument. sock_diag will use these generic functions in a later commit. There is no functional change in this commit. Acked-by: Jon Maloy <jon.maloy@ericsson.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: GhantaKrishnamurthy MohanKrishna <mohan.krishna.ghanta.krishnamurthy@ericsson.com> Signed-off-by: Parthasarathy Bhuvaragan <parthasarathy.bhuvaragan@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-17tipc: some name changesJon Maloy
We rename some lists and fields in struct publication both to make the naming more consistent and to better reflect their roles. We also update the descriptions of those lists. node_list -> local_publ cluster_list -> all_publ pport_list -> binding_sock ref -> port There are no functional changes in this commit. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-17tipc: merge two lists in struct publicationJon Maloy
The size of struct publication can be reduced further. Membership in lists 'nodesub_list' and 'local_list' is mutually exlusive, in that remote publications use the former and local publications the latter. We replace the two lists with one single, named 'binding_node' which reflects what it really is. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-17tipc: remove zone_list member in struct publicationJon Maloy
As a further consequence of the previous commits, we can also remove the member 'zone_list 'in struct name_info and struct publication. Instead, we now let the member cluster_list take over the role a container of all publications of a given <type,lower, upper>. We also remove the counters for the size of those lists, since they don't serve any purpose. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-17tipc: remove zone publication list in name tableJon Maloy
As a consequence of the previous commit we nan now eliminate zone scope related lists in the name table. We start with name_table::publ_list[3], which can now be replaced with two lists, one for node scope publications and one for cluster scope publications. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-17tipc: obsolete TIPC_ZONE_SCOPEJon Maloy
Publications for TIPC_CLUSTER_SCOPE and TIPC_ZONE_SCOPE are in all aspects handled the same way, both on the publishing node and on the receiving nodes. Despite previous ambitions to the contrary, this is never going to change, so we take the conseqeunce of this and obsolete TIPC_ZONE_SCOPE and related macros/functions. Whenever a user is doing a bind() or a sendmsg() attempt using ZONE_SCOPE we translate this internally to CLUSTER_SCOPE, while we remain compatible with users and remote nodes still using ZONE_SCOPE. Furthermore, the non-formalized scope value 0 has always been permitted for use during lookup, with the same meaning as ZONE_SCOPE/CLUSTER_SCOPE. We now permit it even as binding scope, but for compatibility reasons we choose to not change the value of TIPC_CLUSTER_SCOPE. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-13net: Convert tipc_net_opsKirill Tkhai
TIPC looks concentrated in itself, and other pernet_operations seem not touching its entities. tipc_net_ops look pernet-divided, and they should be safe to be executed in parallel for several net the same time. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-07tipc: bcast: use true and false for boolean valuesGustavo A. R. Silva
Assign true or false to boolean variables instead of an integer value. This issue was detected with the help of Coccinelle. Signed-off-by: Gustavo A. R. Silva <garsilva@embeddedor.com> Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-06Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
All of the conflicts were cases of overlapping changes. In net/core/devlink.c, we have to make care that the resouce size_params have become a struct member rather than a pointer to such an object. Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-27tipc: correct initial value for group congestion flagJon Maloy
In commit 60c253069632 ("tipc: fix race between poll() and setsockopt()") we introduced a pointer from struct tipc_group to the 'group_is_connected' flag in struct tipc_sock, so that this field can be checked without dereferencing the group pointer of the latter struct. The initial value for this flag is correctly set to 'false' when a group is created, but we miss the case when no group is created at all, in which case the initial value should be 'true'. This has the effect that SOCK_RDM/DGRAM sockets sending datagrams never receive POLLOUT if they request so. This commit corrects this bug. Fixes: 60c253069632 ("tipc: fix race between poll() and setsockopt()") Reported-by: Hoang Le <hoang.h.le@dektek.com.au> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-19Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller
2018-02-19tipc: don't call sock_release() in atomic contextPaolo Abeni
syzbot reported a scheduling while atomic issue at netns destruction time: BUG: sleeping function called from invalid context at net/core/sock.c:2769 in_atomic(): 1, irqs_disabled(): 0, pid: 85, name: kworker/u4:3 5 locks held by kworker/u4:3/85: #0: ((wq_completion)"%s""netns"){+.+.}, at: [<00000000c9792deb>] process_one_work+0xaaf/0x1af0 kernel/workqueue.c:2084 #1: (net_cleanup_work){+.+.}, at: [<00000000adc12e2a>] process_one_work+0xb01/0x1af0 kernel/workqueue.c:2088 #2: (net_sem){++++}, at: [<000000009ccb5669>] cleanup_net+0x23f/0xd20 net/core/net_namespace.c:494 #3: (net_mutex){+.+.}, at: [<00000000a92767d9>] cleanup_net+0xa7d/0xd20 net/core/net_namespace.c:496 #4: (&(&srv->idr_lock)->rlock){+...}, at: [<000000001343e568>] spin_lock_bh include/linux/spinlock.h:315 [inline] #4: (&(&srv->idr_lock)->rlock){+...}, at: [<000000001343e568>] tipc_topsrv_stop+0x231/0x610 net/tipc/topsrv.c:685 CPU: 0 PID: 85 Comm: kworker/u4:3 Not tainted 4.16.0-rc1+ #230 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:53 ___might_sleep+0x2b2/0x470 kernel/sched/core.c:6128 __might_sleep+0x95/0x190 kernel/sched/core.c:6081 lock_sock_nested+0x37/0x110 net/core/sock.c:2769 lock_sock include/net/sock.h:1463 [inline] tipc_release+0x103/0xff0 net/tipc/socket.c:572 sock_release+0x8d/0x1e0 net/socket.c:594 tipc_topsrv_stop+0x3c0/0x610 net/tipc/topsrv.c:696 tipc_exit_net+0x15/0x40 net/tipc/core.c:96 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:148 cleanup_net+0x6ba/0xd20 net/core/net_namespace.c:529 process_one_work+0xbbf/0x1af0 kernel/workqueue.c:2113 worker_thread+0x223/0x1990 kernel/workqueue.c:2247 kthread+0x33c/0x400 kernel/kthread.c:238 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:429 This is caused by tipc_topsrv_stop() releasing the listener socket with the idr lock held. This changeset addresses the issue moving the release operation outside such lock. Reported-and-tested-by: syzbot+749d9d87c294c00ca856@syzkaller.appspotmail.com Fixes: 0ef897be12b8 ("tipc: separate topology server listener socket from subcsriber sockets") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: ///jon Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-19tipc: fix bug on error path in tipc_topsrv_kern_subscr()Jon Maloy
In commit cc1ea9ffadf7 ("tipc: eliminate struct tipc_subscriber") we re-introduced an old bug on the error path in the function tipc_topsrv_kern_subscr(). We now re-introduce the correction too. Reported-by: syzbot+f62e0f2a0ef578703946@syzkaller.appspotmail.com Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: rename tipc_server to tipc_topsrvJon Maloy
We rename struct tipc_server to struct tipc_topsrv. This reflect its now specialized role as topology server. Accoringly, we change or add function prefixes to make it clearer which functionality those belong to. There are no functional changes in this commit. Acked-by: Ying.Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: separate topology server listener socket from subcsriber socketsJon Maloy
We move the listener socket to struct tipc_server and give it its own work item. This makes it easier to follow the code, and entails some simplifications in the reception code in subscriber sockets. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: make struct tipc_server private for server.cJon Maloy
In order to narrow the interface and dependencies between the topology server and the subscription/binding table functionality we move struct tipc_server inside the file server.c. This requires some code adaptations in other files, but those are mostly minor. The most important change is that we have to move the start/stop functions for the topology server to server.c, where they logically belong anyway. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: some prefix changesJon Maloy
Since we now have removed struct tipc_subscriber from the code, and only struct tipc_subscription remains, there is no longer need for long and awkward prefixes to distinguish between their pertaining functions. We now change all tipc_subscrp_* prefixes to tipc_sub_*. This is a purely cosmetic change. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: collapse subscription creation functionsJon Maloy
After the previous changes it becomes logical to collapse the two-level creation of subscription instances into one. We do that here. We also rename the creation and deletion functions for more consistency. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: simplify endianness handling in topology subscriberJon Maloy
Because of the requirement for total distribution transparency, users send subscriptions and receive topology events in their own host format. It is up to the topology server to determine this format and do the correct conversions to and from its own host format when needed. Until now, this has been handled in a rather non-transparent way inside the topology server and subscriber code, leading to unnecessary complexity when creating subscriptions and issuing events. We now improve this situation by adding two new macros, tipc_sub_read() and tipc_evt_write(). Both those functions calculate the need for conversion internally before performing their respective operations. Hence, all handling of such conversions become transparent to the rest of the code. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: simplify interaction between subscription and topology connectionJon Maloy
The message transmission and reception in the topology server is more generic than is currently necessary. By basing the funtionality on the fact that we only send items of type struct tipc_event and always receive items of struct tipc_subcr we can make several simplifications, and also get rid of some unnecessary dynamic memory allocations. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: eliminate struct tipc_subscriberJon Maloy
It is unnecessary to keep two structures, struct tipc_conn and struct tipc_subscriber, with a one-to-one relationship and still with different life cycles. The fact that the two often run in different contexts, and still may access each other via direct pointers constitutes an additional hazard, something we have experienced at several occasions, and still see happening. We have identified at least two remaining problems that are easier to fix if we simplify the topology server data structure somewhat. - When there is a race between a subscription up/down event and a timeout event, it is fully possible that the former might be delivered after the latter, leading to confusion for the receiver. - The function tipc_subcrp_timeout() is executing in interrupt context, while the following call chain is at least theoretically possible: tipc_subscrp_timeout() tipc_subscrp_send_event() tipc_conn_sendmsg() conn_put() tipc_conn_kref_release() sock_release(sock) I.e., we end up calling a function that might try to sleep in interrupt context. To eliminate this, we need to ensure that the tipc_conn structure and the socket, as well as the subscription instances, only are deleted in work queue context, i.e., after the timeout event really has been sent out. We now remove this unnecessary complexity, by merging data and functionality of the subscriber structure into struct tipc_conn and the associated file server.c. We thereafter add a spinlock and a new 'inactive' state to the subscription structure. Using those, both problems described above can be easily solved. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-16tipc: remove unnecessary function pointersJon Maloy
Interaction between the functionality in server.c and subscr.c is done via function pointers installed in struct server. This makes the code harder to follow, and doesn't serve any obvious purpose. Here, we replace the function pointers with direct function calls. Acked-by: Ying Xue <ying.xue@windriver.com> Signed-off-by: Jon Maloy <jon.maloy@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>