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2021-10-14netfilter: arp_tables: allow use of arpt_do_table as hookfnFlorian Westphal1-3/+4
This is possible now that the xt_table structure is passed in via *priv. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-05-03netfilter: arptables: use pernet ops struct during unregisterFlorian Westphal1-3/+2
Like with iptables and ebtables, hook unregistration has to use the pernet ops struct, not the template. This triggered following splat: hook not found, pf 3 num 0 WARNING: CPU: 0 PID: 224 at net/netfilter/core.c:480 __nf_unregister_net_hook+0x1eb/0x610 net/netfilter/core.c:480 [..] nf_unregister_net_hook net/netfilter/core.c:502 [inline] nf_unregister_net_hooks+0x117/0x160 net/netfilter/core.c:576 arpt_unregister_table_pre_exit+0x67/0x80 net/ipv4/netfilter/arp_tables.c:1565 Fixes: f9006acc8dfe5 ("netfilter: arp_tables: pass table pointer via nf_hook_ops") Reported-by: syzbot+dcccba8a1e41a38cb9df@syzkaller.appspotmail.com Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-04-26netfilter: allow to turn off xtables compat layerFlorian Westphal1-8/+8
The compat layer needs to parse untrusted input (the ruleset) to translate it to a 64bit compatible format. We had a number of bugs in this department in the past, so allow users to turn this feature off. Add CONFIG_NETFILTER_XTABLES_COMPAT kconfig knob and make it default to y to keep existing behaviour. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-04-26netfilter: arp_tables: pass table pointer via nf_hook_opsFlorian Westphal1-14/+29
Same change as previous patch. Only difference: no need to handle NULL template_ops parameter, the only caller (arptable_filter) always passes non-NULL argument. This removes all remaining accesses to net->ipv4.arptable_filter. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-04-26netfilter: arptables: unregister the tables by nameFlorian Westphal1-4/+10
and again, this time for arptables. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-04-13netfilter: x_tables: fix compat match/target pad out-of-bound writeFlorian Westphal1-0/+2
xt_compat_match/target_from_user doesn't check that zeroing the area to start of next rule won't write past end of allocated ruleset blob. Remove this code and zero the entire blob beforehand. Reported-by: syzbot+cfc0247ac173f597aaaa@syzkaller.appspotmail.com Reported-by: Andy Nguyen <theflow@google.com> Fixes: 9fa492cdc160c ("[NETFILTER]: x_tables: simplify compat API") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-04-10netfilter: arp_tables: add pre_exit hook for table unregisterFlorian Westphal1-2/+7
Same problem that also existed in iptables/ip(6)tables, when arptable_filter is removed there is no longer a wait period before the table/ruleset is free'd. Unregister the hook in pre_exit, then remove the table in the exit function. This used to work correctly because the old nf_hook_unregister API did unconditional synchronize_net. The per-net hook unregister function uses call_rcu instead. Fixes: b9e69e127397 ("netfilter: xtables: don't hook tables by default") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-03-15Revert "netfilter: x_tables: Switch synchronization to RCU"Mark Tomlinson1-7/+7
This reverts commit cc00bcaa589914096edef7fb87ca5cee4a166b5c. This (and the preceding) patch basically re-implemented the RCU mechanisms of patch 784544739a25. That patch was replaced because of the performance problems that it created when replacing tables. Now, we have the same issue: the call to synchronize_rcu() makes replacing tables slower by as much as an order of magnitude. Prior to using RCU a script calling "iptables" approx. 200 times was taking 1.16s. With RCU this increased to 11.59s. Revert these patches and fix the issue in a different way. Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-03-15Revert "netfilter: x_tables: Update remaining dereference to RCU"Mark Tomlinson1-1/+1
This reverts commit 443d6e86f821a165fae3fc3fc13086d27ac140b1. This (and the following) patch basically re-implemented the RCU mechanisms of patch 784544739a25. That patch was replaced because of the performance problems that it created when replacing tables. Now, we have the same issue: the call to synchronize_rcu() makes replacing tables slower by as much as an order of magnitude. Revert these patches and fix the issue in a different way. Signed-off-by: Mark Tomlinson <mark.tomlinson@alliedtelesis.co.nz> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-17netfilter: x_tables: Update remaining dereference to RCUSubash Abhinov Kasiviswanathan1-1/+1
This fixes the dereference to fetch the RCU pointer when holding the appropriate xtables lock. Reported-by: kernel test robot <lkp@intel.com> Fixes: cc00bcaa5899 ("netfilter: x_tables: Switch synchronization to RCU") Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> Reviewed-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-08netfilter: x_tables: Switch synchronization to RCUSubash Abhinov Kasiviswanathan1-7/+7
When running concurrent iptables rules replacement with data, the per CPU sequence count is checked after the assignment of the new information. The sequence count is used to synchronize with the packet path without the use of any explicit locking. If there are any packets in the packet path using the table information, the sequence count is incremented to an odd value and is incremented to an even after the packet process completion. The new table value assignment is followed by a write memory barrier so every CPU should see the latest value. If the packet path has started with the old table information, the sequence counter will be odd and the iptables replacement will wait till the sequence count is even prior to freeing the old table info. However, this assumes that the new table information assignment and the memory barrier is actually executed prior to the counter check in the replacement thread. If CPU decides to execute the assignment later as there is no user of the table information prior to the sequence check, the packet path in another CPU may use the old table information. The replacement thread would then free the table information under it leading to a use after free in the packet processing context- Unable to handle kernel NULL pointer dereference at virtual address 000000000000008e pc : ip6t_do_table+0x5d0/0x89c lr : ip6t_do_table+0x5b8/0x89c ip6t_do_table+0x5d0/0x89c ip6table_filter_hook+0x24/0x30 nf_hook_slow+0x84/0x120 ip6_input+0x74/0xe0 ip6_rcv_finish+0x7c/0x128 ipv6_rcv+0xac/0xe4 __netif_receive_skb+0x84/0x17c process_backlog+0x15c/0x1b8 napi_poll+0x88/0x284 net_rx_action+0xbc/0x23c __do_softirq+0x20c/0x48c This could be fixed by forcing instruction order after the new table information assignment or by switching to RCU for the synchronization. Fixes: 80055dab5de0 ("netfilter: x_tables: make xt_replace_table wait until old rules are not used anymore") Reported-by: Sean Tranchetti <stranche@codeaurora.org> Reported-by: kernel test robot <lkp@intel.com> Suggested-by: Florian Westphal <fw@strlen.de> Signed-off-by: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-07-28net: remove sockptr_advanceChristoph Hellwig1-4/+4
sockptr_advance never properly worked. Replace it with _offset variants of copy_from_sockptr and copy_to_sockptr. Fixes: ba423fdaa589 ("net: add a new sockptr_t type") Reported-by: Jason A. Donenfeld <Jason@zx2c4.com> Reported-by: Ido Schimmel <idosch@idosch.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Jason A. Donenfeld <Jason@zx2c4.com> Tested-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-28netfilter: arp_tables: restore a SPDX identifierChristoph Hellwig1-1/+1
This was accidentally removed in an unrelated commit. Fixes: c2f12630c60f ("netfilter: switch nf_setsockopt to sockptr_t") Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-24netfilter: switch nf_setsockopt to sockptr_tChristoph Hellwig1-14/+14
Pass a sockptr_t to prepare for set_fs-less handling of the kernel pointer from bpf-cgroup. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-24netfilter: switch xt_copy_counters to sockptr_tChristoph Hellwig1-4/+3
Pass a sockptr_t to prepare for set_fs-less handling of the kernel pointer from bpf-cgroup. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-19netfilter: remove the compat argument to xt_copy_counters_from_userChristoph Hellwig1-2/+1
Lift the in_compat_syscall() from the callers instead. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-07-19netfilter/arp_tables: clean up compat {get, set}sockopt handlingChristoph Hellwig1-64/+21
Merge the native and compat {get,set}sockopt handlers using in_compat_syscall(). Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
2020-03-15netfilter: Replace zero-length array with flexible-array memberGustavo A. R. Silva1-2/+2
The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] Lastly, fix checkpatch.pl warning WARNING: __aligned(size) is preferred over __attribute__((aligned(size))) in net/bridge/netfilter/ebtables.c This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-01-13netfilter: arp_tables: init netns pointer in xt_tgdtor_param structFlorian Westphal1-9/+10
An earlier commit (1b789577f655060d98d20e, "netfilter: arp_tables: init netns pointer in xt_tgchk_param struct") fixed missing net initialization for arptables, but turns out it was incomplete. We can get a very similar struct net NULL deref during error unwinding: general protection fault: 0000 [#1] PREEMPT SMP KASAN RIP: 0010:xt_rateest_put+0xa1/0x440 net/netfilter/xt_RATEEST.c:77 xt_rateest_tg_destroy+0x72/0xa0 net/netfilter/xt_RATEEST.c:175 cleanup_entry net/ipv4/netfilter/arp_tables.c:509 [inline] translate_table+0x11f4/0x1d80 net/ipv4/netfilter/arp_tables.c:587 do_replace net/ipv4/netfilter/arp_tables.c:981 [inline] do_arpt_set_ctl+0x317/0x650 net/ipv4/netfilter/arp_tables.c:1461 Also init the netns pointer in xt_tgdtor_param struct. Fixes: add67461240c1d ("netfilter: add struct net * to target parameters") Reported-by: syzbot+91bdd8eece0f6629ec8b@syzkaller.appspotmail.com Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2019-12-30netfilter: arp_tables: init netns pointer in xt_tgchk_param structFlorian Westphal1-11/+16
We get crash when the targets checkentry function tries to make use of the network namespace pointer for arptables. When the net pointer got added back in 2010, only ip/ip6/ebtables were changed to initialize it, so arptables has this set to NULL. This isn't a problem for normal arptables because no existing arptables target has a checkentry function that makes use of par->net. However, direct users of the setsockopt interface can provide any target they want as long as its registered for ARP or UNPSEC protocols. syzkaller managed to send a semi-valid arptables rule for RATEEST target which is enough to trigger NULL deref: kasan: GPF could be caused by NULL-ptr deref or user memory access general protection fault: 0000 [#1] PREEMPT SMP KASAN RIP: xt_rateest_tg_checkentry+0x11d/0xb40 net/netfilter/xt_RATEEST.c:109 [..] xt_check_target+0x283/0x690 net/netfilter/x_tables.c:1019 check_target net/ipv4/netfilter/arp_tables.c:399 [inline] find_check_entry net/ipv4/netfilter/arp_tables.c:422 [inline] translate_table+0x1005/0x1d70 net/ipv4/netfilter/arp_tables.c:572 do_replace net/ipv4/netfilter/arp_tables.c:977 [inline] do_arpt_set_ctl+0x310/0x640 net/ipv4/netfilter/arp_tables.c:1456 Fixes: add67461240c1d ("netfilter: add struct net * to target parameters") Reported-by: syzbot+d7358a458d8a81aee898@syzkaller.appspotmail.com Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2019-05-21treewide: Add SPDX license identifier for more missed filesThomas Gleixner1-0/+1
Add SPDX license identifiers to all files which: - Have no license information of any form - Have MODULE_LICENCE("GPL*") inside which was used in the initial scan/conversion to ignore the file These files fall under the project license, GPL v2 only. The resulting SPDX license identifier is: GPL-2.0-only Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2018-03-30Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextDavid S. Miller1-20/+13
Pablo Neira Ayuso says: ==================== Netfilter/IPVS updates for net-next The following patchset contains Netfilter/IPVS updates for your net-next tree. This batch comes with more input sanitization for xtables to address bug reports from fuzzers, preparation works to the flowtable infrastructure and assorted updates. In no particular order, they are: 1) Make sure userspace provides a valid standard target verdict, from Florian Westphal. 2) Sanitize error target size, also from Florian. 3) Validate that last rule in basechain matches underflow/policy since userspace assumes this when decoding the ruleset blob that comes from the kernel, from Florian. 4) Consolidate hook entry checks through xt_check_table_hooks(), patch from Florian. 5) Cap ruleset allocations at 512 mbytes, 134217728 rules and reject very large compat offset arrays, so we have a reasonable upper limit and fuzzers don't exercise the oom-killer. Patches from Florian. 6) Several WARN_ON checks on xtables mutex helper, from Florian. 7) xt_rateest now has a hashtable per net, from Cong Wang. 8) Consolidate counter allocation in xt_counters_alloc(), from Florian. 9) Earlier xt_table_unlock() call in {ip,ip6,arp,eb}tables, patch from Xin Long. 10) Set FLOW_OFFLOAD_DIR_* to IP_CT_DIR_* definitions, patch from Felix Fietkau. 11) Consolidate code through flow_offload_fill_dir(), also from Felix. 12) Inline ip6_dst_mtu_forward() just like ip_dst_mtu_maybe_forward() to remove a dependency with flowtable and ipv6.ko, from Felix. 13) Cache mtu size in flow_offload_tuple object, this is safe for forwarding as f87c10a8aa1e describes, from Felix. 14) Rename nf_flow_table.c to nf_flow_table_core.o, to simplify too modular infrastructure, from Felix. 15) Add rt0, rt2 and rt4 IPv6 routing extension support, patch from Ahmed Abdelsalam. 16) Remove unused parameter in nf_conncount_count(), from Yi-Hung Wei. 17) Support for counting only to nf_conncount infrastructure, patch from Yi-Hung Wei. 18) Add strict NFT_CT_{SRC_IP,DST_IP,SRC_IP6,DST_IP6} key datatypes to nft_ct. 19) Use boolean as return value from ipt_ah and from IPVS too, patch from Gustavo A. R. Silva. 20) Remove useless parameters in nfnl_acct_overquota() and nf_conntrack_broadcast_help(), from Taehee Yoo. 21) Use ipv6_addr_is_multicast() from xt_cluster, also from Taehee Yoo. 22) Statify nf_tables_obj_lookup_byhandle, patch from Fengguang Wu. 23) Fix typo in xt_limit, from Geert Uytterhoeven. 24) Do no use VLAs in Netfilter code, again from Gustavo. 25) Use ADD_COUNTER from ebtables, from Taehee Yoo. 26) Bitshift support for CONNMARK and MARK targets, from Jack Ma. 27) Use pr_*() and add pr_fmt(), from Arushi Singhal. 28) Add synproxy support to ctnetlink. 29) ICMP type and IGMP matching support for ebtables, patches from Matthias Schiffer. 30) Support for the revision infrastructure to ebtables, from Bernie Harris. 31) String match support for ebtables, also from Bernie. 32) Documentation for the new flowtable infrastructure. 33) Use generic comparison functions in ebt_stp, from Joe Perches. 34) Demodularize filter chains in nftables. 35) Register conntrack hooks in case nftables NAT chain is added. 36) Merge assignments with return in a couple of spots in the Netfilter codebase, also from Arushi. 37) Document that xtables percpu counters are stored in the same memory area, from Ben Hutchings. 38) Revert mark_source_chains() sanity checks that break existing rulesets, from Florian Westphal. 39) Use is_zero_ether_addr() in the ipset codebase, from Joe Perches. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2018-03-30Revert "netfilter: x_tables: ensure last rule in base chain matches underflow/policy"Florian Westphal1-16/+1
This reverts commit 0d7df906a0e78079a02108b06d32c3ef2238ad25. Valdis Kletnieks reported that xtables is broken in linux-next since 0d7df906a0e78 ("netfilter: x_tables: ensure last rule in base chain matches underflow/policy"), as kernel rejects the (well-formed) ruleset: [ 64.402790] ip6_tables: last base chain position 1136 doesn't match underflow 1344 (hook 1) mark_source_chains is not the correct place for such a check, as it terminates evaluation of a chain once it sees an unconditional verdict (following rules are known to be unreachable). It seems preferrable to fix libiptc instead, so remove this check again. Fixes: 0d7df906a0e78 ("netfilter: x_tables: ensure last rule in base chain matches underflow/policy") Reported-by: Valdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-03-27net: Drop pernet_operations::asyncKirill Tkhai1-1/+0
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>
2018-03-05netfilter: x_tables: ensure last rule in base chain matches underflow/policyFlorian Westphal1-1/+16
Harmless from kernel point of view, but again iptables assumes that this is true when decoding ruleset coming from kernel. If a (syzkaller generated) ruleset doesn't have the underflow/policy stored as the last rule in the base chain, then iptables will abort() because it doesn't find the chain policy. libiptc assumes that the policy is the last rule in the basechain, which is only true for iptables-generated rulesets. Unfortunately this needs code duplication -- the functions need the struct layout of the rule head, but that is different for ip/ip6/arptables. NB: pr_warn could be pr_debug but in case this break rulesets somehow its useful to know why blob was rejected. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-03-05netfilter: compat: prepare xt_compat_init_offsets to return errorsFlorian Westphal1-3/+7
should have no impact, function still always returns 0. This patch is only to ease review. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-03-05netfilter: x_tables: add counters allocation wrapperFlorian Westphal1-1/+1
allows to have size checks in a single spot. This is supposed to reduce oom situations when fuzz-testing xtables. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-03-05netfilter: x_tables: move hook entry checks into coreFlorian Westphal1-10/+3
Allow followup patch to change on location instead of three. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-03-05netfilter: x_tables: check standard verdicts in coreFlorian Westphal1-5/+0
Userspace must provide a valid verdict to the standard target. The verdict can be either a jump (signed int > 0), or a return code. Allowed return codes are either RETURN (pop from stack), NF_ACCEPT, DROP and QUEUE (latter is allowed for legacy reasons). Jump offsets (verdict > 0) are checked in more detail later on when loop-detection is performed. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-03-05netfilter: unlock xt_table earlier in __do_replaceXin Long1-1/+2
Now it's doing cleanup_entry for oldinfo under the xt_table lock, but it's not really necessary. After the replacement job is done in xt_replace_table, oldinfo is not used elsewhere any more, and it can be freed without xt_table lock safely. The important thing is that rtnl_lock is called in some xt_target destroy, which means rtnl_lock, a big lock is used in xt_table lock, a smaller one. It usually could be the reason why a dead lock may happen. Besides, all xt_target/match checkentry is called out of xt_table lock. It's better also to move all cleanup_entry calling out of xt_table lock, just as do_replace_finish does for ebtables. Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-03-05net: Convert arp_tables_net_ops and ip6_tables_net_opsKirill Tkhai1-0/+1
These pernet_operations call xt_proto_init() and xt_proto_fini(), which just register and unregister /proc entries. They are safe to be marked as async. Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-14netfilter: add back stackpointer size checksFlorian Westphal1-0/+4
The rationale for removing the check is only correct for rulesets generated by ip(6)tables. In iptables, a jump can only occur to a user-defined chain, i.e. because we size the stack based on number of user-defined chains we cannot exceed stack size. However, the underlying binary format has no such restriction, and the validation step only ensures that the jump target is a valid rule start point. IOW, its possible to build a rule blob that has no user-defined chains but does contain a jump. If this happens, no jump stack gets allocated and crash occurs because no jumpstack was allocated. Fixes: 7814b6ec6d0d6 ("netfilter: xtables: don't save/restore jumpstack offset") Reported-by: syzbot+e783f671527912cd9403@syzkaller.appspotmail.com Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-01-31Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-nextLinus Torvalds1-15/+12
Pull networking updates from David Miller: 1) Significantly shrink the core networking routing structures. Result of http://vger.kernel.org/~davem/seoul2017_netdev_keynote.pdf 2) Add netdevsim driver for testing various offloads, from Jakub Kicinski. 3) Support cross-chip FDB operations in DSA, from Vivien Didelot. 4) Add a 2nd listener hash table for TCP, similar to what was done for UDP. From Martin KaFai Lau. 5) Add eBPF based queue selection to tun, from Jason Wang. 6) Lockless qdisc support, from John Fastabend. 7) SCTP stream interleave support, from Xin Long. 8) Smoother TCP receive autotuning, from Eric Dumazet. 9) Lots of erspan tunneling enhancements, from William Tu. 10) Add true function call support to BPF, from Alexei Starovoitov. 11) Add explicit support for GRO HW offloading, from Michael Chan. 12) Support extack generation in more netlink subsystems. From Alexander Aring, Quentin Monnet, and Jakub Kicinski. 13) Add 1000BaseX, flow control, and EEE support to mvneta driver. From Russell King. 14) Add flow table abstraction to netfilter, from Pablo Neira Ayuso. 15) Many improvements and simplifications to the NFP driver bpf JIT, from Jakub Kicinski. 16) Support for ipv6 non-equal cost multipath routing, from Ido Schimmel. 17) Add resource abstration to devlink, from Arkadi Sharshevsky. 18) Packet scheduler classifier shared filter block support, from Jiri Pirko. 19) Avoid locking in act_csum, from Davide Caratti. 20) devinet_ioctl() simplifications from Al viro. 21) More TCP bpf improvements from Lawrence Brakmo. 22) Add support for onlink ipv6 route flag, similar to ipv4, from David Ahern. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1925 commits) tls: Add support for encryption using async offload accelerator ip6mr: fix stale iterator net/sched: kconfig: Remove blank help texts openvswitch: meter: Use 64-bit arithmetic instead of 32-bit tcp_nv: fix potential integer overflow in tcpnv_acked r8169: fix RTL8168EP take too long to complete driver initialization. qmi_wwan: Add support for Quectel EP06 rtnetlink: enable IFLA_IF_NETNSID for RTM_NEWLINK ipmr: Fix ptrdiff_t print formatting ibmvnic: Wait for device response when changing MAC qlcnic: fix deadlock bug tcp: release sk_frag.page in tcp_disconnect ipv4: Get the address of interface correctly. net_sched: gen_estimator: fix lockdep splat net: macb: Handle HRESP error net/mlx5e: IPoIB, Fix copy-paste bug in flow steering refactoring ipv6: addrconf: break critical section in addrconf_verify_rtnl() ipv6: change route cache aging logic i40e/i40evf: Update DESC_NEEDED value to reflect larger value bnxt_en: cleanup DIM work on device shutdown ...
2018-01-19netfilter: remove messages print and boot/module load timePablo Neira Ayuso1-1/+0
Several reasons for this: * Several modules maintain internal version numbers, that they print at boot/module load time, that are not exposed to userspace, as a primitive mechanism to make revision number control from the earlier days of Netfilter. * IPset shows the protocol version at boot/module load time, instead display this via module description, as Jozsef suggested. * Remove copyright notice at boot/module load time in two spots, the Netfilter codebase is a collective development effort, if we would have to display copyrights for each contributor at boot/module load time for each extensions we have, we would probably fill up logs with lots of useless information - from a technical standpoint. So let's be consistent and remove them all. Acked-by: Florian Westphal <fw@strlen.de> Acked-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-01-08netfilter: xtables: add and use xt_request_find_table_lockFlorian Westphal1-14/+12
currently we always return -ENOENT to userspace if we can't find a particular table, or if the table initialization fails. Followup patch will make nat table init fail in case nftables already registered a nat hook so this change makes xt_find_table_lock return an ERR_PTR to return the errno value reported from the table init function. Add xt_request_find_table_lock as try_then_request_module replacement and use it where needed. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2018-01-03Merge branch 'for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcuIngo Molnar1-6/+1
Pull RCU updates from Paul E. McKenney: - Updates to use cond_resched() instead of cond_resched_rcu_qs() where feasible (currently everywhere except in kernel/rcu and in kernel/torture.c). Also a couple of fixes to avoid sending IPIs to offline CPUs. - Updates to simplify RCU's dyntick-idle handling. - Updates to remove almost all uses of smp_read_barrier_depends() and read_barrier_depends(). - Miscellaneous fixes. - Torture-test updates. Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-12-04netfilter: Remove now-redundant smp_read_barrier_depends()Paul E. McKenney1-6/+1
READ_ONCE() now implies smp_read_barrier_depends(), which means that the instances in arpt_do_table(), ipt_do_table(), and ip6t_do_table() are now redundant. This commit removes them and adjusts the comments. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Pablo Neira Ayuso <pablo@netfilter.org> Cc: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Cc: Florian Westphal <fw@strlen.de> Cc: "David S. Miller" <davem@davemloft.net> Cc: <netfilter-devel@vger.kernel.org> Cc: <coreteam@netfilter.org> Cc: <netdev@vger.kernel.org>
2017-11-20netfilter: remove redundant assignment to eColin Ian King1-1/+0
The assignment to variable e is redundant since the same assignment occurs just a few lines later, hence it can be removed. Cleans up clang warning for arp_tables, ip_tables and ip6_tables: warning: Value stored to 'e' is never read Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2017-10-24netfilter: x_tables: don't use seqlock when fetching old countersFlorian Westphal1-2/+20
after previous commit xt_replace_table will wait until all cpus had even seqcount (i.e., no cpu is accessing old ruleset). Add a 'old' counter retrival version that doesn't synchronize counters. Its not needed, the old counters are not in use anymore at this point. This speeds up table replacement on busy systems with large tables (and many cores). Cc: Dan Williams <dcbw@redhat.com> Cc: Eric Dumazet <edumazet@google.com> Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2017-09-08netfilter: xtables: add scheduling opportunity in get_countersFlorian Westphal1-0/+1
There are reports about spurious softlockups during iptables-restore, a backtrace i saw points at get_counters -- it uses a sequence lock and also has unbounded restart loop. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2017-09-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextDavid S. Miller1-2/+0
Pablo Neira Ayuso says: ==================== Netfilter updates for net-next The following patchset contains Netfilter updates for your net-next tree. Basically, updates to the conntrack core, enhancements for nf_tables, conversion of netfilter hooks from linked list to array to improve memory locality and asorted improvements for the Netfilter codebase. More specifically, they are: 1) Add expection to hashes after timer initialization to prevent access from another CPU that walks on the hashes and calls del_timer(), from Florian Westphal. 2) Don't update nf_tables chain counters from hot path, this is only used by the x_tables compatibility layer. 3) Get rid of nested rcu_read_lock() calls from netfilter hook path. Hooks are always guaranteed to run from rcu read side, so remove nested rcu_read_lock() where possible. Patch from Taehee Yoo. 4) nf_tables new ruleset generation notifications include PID and name of the process that has updated the ruleset, from Phil Sutter. 5) Use skb_header_pointer() from nft_fib, so we can reuse this code from the nf_family netdev family. Patch from Pablo M. Bermudo. 6) Add support for nft_fib in nf_tables netdev family, also from Pablo. 7) Use deferrable workqueue for conntrack garbage collection, to reduce power consumption, from Patch from Subash Abhinov Kasiviswanathan. 8) Add nf_ct_expect_iterate_net() helper and use it. From Florian Westphal. 9) Call nf_ct_unconfirmed_destroy only from cttimeout, from Florian. 10) Drop references on conntrack removal path when skbuffs has escaped via nfqueue, from Florian. 11) Don't queue packets to nfqueue with dying conntrack, from Florian. 12) Constify nf_hook_ops structure, from Florian. 13) Remove neededlessly branch in nf_tables trace code, from Phil Sutter. 14) Add nla_strdup(), from Phil Sutter. 15) Rise nf_tables objects name size up to 255 chars, people want to use DNS names, so increase this according to what RFC 1035 specifies. Patch series from Phil Sutter. 16) Kill nf_conntrack_default_on, it's broken. Default on conntrack hook registration on demand, suggested by Eric Dumazet, patch from Florian. 17) Remove unused variables in compat_copy_entry_from_user both in ip_tables and arp_tables code. Patch from Taehee Yoo. 18) Constify struct nf_conntrack_l4proto, from Julia Lawall. 19) Constify nf_loginfo structure, also from Julia. 20) Use a single rb root in connlimit, from Taehee Yoo. 21) Remove unused netfilter_queue_init() prototype, from Taehee Yoo. 22) Use audit_log() instead of open-coding it, from Geliang Tang. 23) Allow to mangle tcp options via nft_exthdr, from Florian. 24) Allow to fetch TCP MSS from nft_rt, from Florian. This includes a fix for a miscalculation of the minimal length. 25) Simplify branch logic in h323 helper, from Nick Desaulniers. 26) Calculate netlink attribute size for conntrack tuple at compile time, from Florian. 27) Remove protocol name field from nf_conntrack_{l3,l4}proto structure. From Florian. 28) Remove holes in nf_conntrack_l4proto structure, so it becomes smaller. From Florian. 29) Get rid of print_tuple() indirection for /proc conntrack listing. Place all the code in net/netfilter/nf_conntrack_standalone.c. Patch from Florian. 30) Do not built in print_conntrack() if CONFIG_NF_CONNTRACK_PROCFS is off. From Florian. 31) Constify most nf_conntrack_{l3,l4}proto helper functions, from Florian. 32) Fix broken indentation in ebtables extensions, from Colin Ian King. 33) Fix several harmless sparse warning, from Florian. 34) Convert netfilter hook infrastructure to use array for better memory locality, joint work done by Florian and Aaron Conole. Moreover, add some instrumentation to debug this. 35) Batch nf_unregister_net_hooks() calls, to call synchronize_net once per batch, from Florian. 36) Get rid of noisy logging in ICMPv6 conntrack helper, from Florian. 37) Get rid of obsolete NFDEBUG() instrumentation, from Varsha Rao. 38) Remove unused code in the generic protocol tracker, from Davide Caratti. I think I will have material for a second Netfilter batch in my queue if time allow to make it fit in this merge window. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2017-08-02netfilter: xtables: Remove unused variable in compat_copy_entry_from_user()Taehee Yoo1-2/+0
The target variable is not used in the compat_copy_entry_from_user(). So It can be removed. Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2017-07-31netfilter: x_tables: Fix use-after-free in ipt_do_table.Taehee Yoo1-5/+5
If verdict is NF_STOLEN in the SYNPROXY target, the skb is consumed. However, ipt_do_table() always tries to get ip header from the skb. So that, KASAN triggers the use-after-free message. We can reproduce this message using below command. # iptables -I INPUT -p tcp -j SYNPROXY --mss 1460 [ 193.542265] BUG: KASAN: use-after-free in ipt_do_table+0x1405/0x1c10 [ ... ] [ 193.578603] Call Trace: [ 193.581590] <IRQ> [ 193.584107] dump_stack+0x68/0xa0 [ 193.588168] print_address_description+0x78/0x290 [ 193.593828] ? ipt_do_table+0x1405/0x1c10 [ 193.598690] kasan_report+0x230/0x340 [ 193.603194] __asan_report_load2_noabort+0x19/0x20 [ 193.608950] ipt_do_table+0x1405/0x1c10 [ 193.613591] ? rcu_read_lock_held+0xae/0xd0 [ 193.618631] ? ip_route_input_rcu+0x27d7/0x4270 [ 193.624348] ? ipt_do_table+0xb68/0x1c10 [ 193.629124] ? do_add_counters+0x620/0x620 [ 193.634234] ? iptable_filter_net_init+0x60/0x60 [ ... ] After this patch, only when verdict is XT_CONTINUE, ipt_do_table() tries to get ip header. Also arpt_do_table() is modified because it has same bug. Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2017-04-07netfilter: Remove unnecessary cast on void pointersimran singhal1-13/+8
The following Coccinelle script was used to detect this: @r@ expression x; void* e; type T; identifier f; @@ ( *((T *)e) | ((T *)x)[...] | ((T*)x)->f | - (T*) e ) Unnecessary parantheses are also remove. Signed-off-by: simran singhal <singhalsimran0@gmail.com> Reviewed-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2017-03-06netfilter: arp_tables: remove redundant check on ret being non-zeroColin Ian King1-2/+0
ret is initialized to zero and if it is set to non-zero in the xt_entry_foreach loop then we exit via the out_free label. Hence the check for ret being non-zero is redundant and can be removed. Detected by CoverityScan, CID#1357132 ("Logically Dead Code") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2017-01-09arptables: use match, target and data copy_to_user helpersWillem de Bruijn1-10/+5
Convert arptables to copying entries, matches and targets one by one, using the xt_match_to_user and xt_target_to_user helper functions. Signed-off-by: Willem de Bruijn <willemb@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2016-12-24Replace <asm/uaccess.h> with <linux/uaccess.h> globallyLinus Torvalds1-1/+1
This was entirely automated, using the script by Al: PATT='^[[:blank:]]*#[[:blank:]]*include[[:blank:]]*<asm/uaccess.h>' sed -i -e "s!$PATT!#include <linux/uaccess.h>!" \ $(git grep -l "$PATT"|grep -v ^include/linux/uaccess.h) to do the replacement at the end of the merge window. Requested-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2016-12-06netfilter: x_tables: pack percpu counter allocationsFlorian Westphal1-3/+6
instead of allocating each xt_counter individually, allocate 4k chunks and then use these for counter allocation requests. This should speed up rule evaluation by increasing data locality, also speeds up ruleset loading because we reduce calls to the percpu allocator. As Eric points out we can't use PAGE_SIZE, page_allocator would fail on arches with 64k page size. Suggested-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2016-12-06netfilter: x_tables: pass xt_counters struct to counter allocatorFlorian Westphal1-4/+1
Keeps some noise away from a followup patch. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2016-12-06netfilter: x_tables: pass xt_counters struct instead of packet counterFlorian Westphal1-2/+2
On SMP we overload the packet counter (unsigned long) to contain percpu offset. Hide this from callers and pass xt_counters address instead. Preparation patch to allocate the percpu counters in page-sized batch chunks. Signed-off-by: Florian Westphal <fw@strlen.de> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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