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* netfilter: nf_tables: get rid of possible_net_t from set and basechainPablo Neira Ayuso2016-07-114-29/+29
| | | | | | | | We can pass the netns pointer as parameter to the functions that need to gain access to it. From basechains, I didn't find any client for this field anymore so let's remove this too. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netfilter: nft_ct: make byte/packet expr more friendlyLiping Zhang2016-07-111-0/+3
| | | | | | | | | | | | | | | | | If we want to use ct packets expr, and add a rule like follows: # nft add rule filter input ct packets gt 1 counter We will find that no packets will hit it, because nf_conntrack_acct is disabled by default. So It will not work until we enable it manually via "echo 1 > /proc/sys/net/netfilter/nf_conntrack_acct". This is not friendly, so like xt_connbytes do, if the user want to use ct byte/packet expr, enable nf_conntrack_acct automatically. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netfilter: physdev: physdev-is-out should not work with OUTPUT chainHangbin Liu2016-07-111-4/+4
| | | | | | | | | | | | physdev_mt() will check skb->nf_bridge first, which was alloced in br_nf_pre_routing. So if we want to use --physdev-out and physdev-is-out, we need to match it in FORWARD or POSTROUTING chain. physdev_mt_check() only checked physdev-out and missed physdev-is-out. Fix it and update the debug message to make it clearer. Signed-off-by: Hangbin Liu <liuhangbin@gmail.com> Reviewed-by: Marcelo R Leitner <marcelo.leitner@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netfilter: nat: convert nat bysrc hash to rhashtableFlorian Westphal2016-07-111-58/+68
| | | | | | | | | | | | | | | | | | | | | It did use a fixed-size bucket list plus single lock to protect add/del. Unlike the main conntrack table we only need to add and remove keys. Convert it to rhashtable to get table autosizing and per-bucket locking. The maximum number of entries is -- as before -- tied to the number of conntracks so we do not need another upperlimit. The change does not handle rhashtable_remove_fast error, only possible "error" is -ENOENT, and that is something that can happen legitimetely, e.g. because nat module was inserted at a later time and no src manip took place yet. Tested with http-client-benchmark + httpterm with DNAT and SNAT rules in place. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netfilter: move nat hlist_head to nf_connFlorian Westphal2016-07-112-39/+9Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The nat extension structure is 32bytes in size on x86_64: struct nf_conn_nat { struct hlist_node bysource; /* 0 16 */ struct nf_conn * ct; /* 16 8 */ union nf_conntrack_nat_help help; /* 24 4 */ int masq_index; /* 28 4 */ /* size: 32, cachelines: 1, members: 4 */ /* last cacheline: 32 bytes */ }; The hlist is needed to quickly check for possible tuple collisions when installing a new nat binding. Storing this in the extension area has two drawbacks: 1. We need ct backpointer to get the conntrack struct from the extension. 2. When reallocation of extension area occurs we need to fixup the bysource hash head via hlist_replace_rcu. We can avoid both by placing the hlist_head in nf_conn and place nf_conn in the bysource hash rather than the extenstion. We can also remove the ->move support; no other extension needs it. Moving the entire nat extension into nf_conn would be possible as well but then we have to add yet another callback for deletion from the bysource hash table rather than just using nat extension ->destroy hook for this. nf_conn size doesn't increase due to aligment, followup patch replaces hlist_node with single pointer. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netfilter: conntrack: simplify early_dropFlorian Westphal2016-07-111-48/+47Star
| | | | | | | | | | | We don't need to acquire the bucket lock during early drop, we can use lockless traveral just like ____nf_conntrack_find. The timer deletion serves as synchronization point, if another cpu attempts to evict same entry, only one will succeed with timer deletion. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netfilter: nf_ct_helper: unlink helper again when hash resize happenLiping Zhang2016-07-111-6/+13
| | | | | | | | | | From: Liping Zhang <liping.zhang@spreadtrum.com> Similar to ctnl_untimeout, when hash resize happened, we should try to do unhelp from the 0# bucket again. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netfilter: cttimeout: unlink timeout obj again when hash resize happenLiping Zhang2016-07-111-6/+14
| | | | | | | | | | | | | | | | | | | Imagine such situation, nf_conntrack_htable_size now is 4096, we are doing ctnl_untimeout, and iterate on 3000# bucket. Meanwhile, another user try to reduce hash size to 2048, then all nf_conn are removed to the new hashtable. When this hash resize operation finished, we still try to itreate ct begin from 3000# bucket, find nothing to do and just return. We may miss unlinking some timeout objects. And later we will end up with invalid references to timeout object that are already gone. So when we find that hash resize happened, try to unlink timeout objects from the 0# bucket again. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* netfilter: conntrack: fix race between nf_conntrack proc read and hash resizeLiping Zhang2016-07-112-5/+26
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When we do "cat /proc/net/nf_conntrack", and meanwhile resize the conntrack hash table via /sys/module/nf_conntrack/parameters/hashsize, race will happen, because reader can observe a newly allocated hash but the old size (or vice versa). So oops will happen like follows： BUG: unable to handle kernel NULL pointer dereference at 0000000000000017 IP: [<ffffffffa0418e21>] seq_print_acct+0x11/0x50 [nf_conntrack] Call Trace: [<ffffffffa0412f4e>] ? ct_seq_show+0x14e/0x340 [nf_conntrack] [<ffffffff81261a1c>] seq_read+0x2cc/0x390 [<ffffffff812a8d62>] proc_reg_read+0x42/0x70 [<ffffffff8123bee7>] __vfs_read+0x37/0x130 [<ffffffff81347980>] ? security_file_permission+0xa0/0xc0 [<ffffffff8123cf75>] vfs_read+0x95/0x140 [<ffffffff8123e475>] SyS_read+0x55/0xc0 [<ffffffff817c2572>] entry_SYSCALL_64_fastpath+0x1a/0xa4 It is very easy to reproduce this kernel crash. 1. open one shell and input the following cmds: while : ; do echo $RANDOM > /sys/module/nf_conntrack/parameters/hashsize done 2. open more shells and input the following cmds: while : ; do cat /proc/net/nf_conntrack done 3. just wait a monent, oops will happen soon. The solution in this patch is based on Florian's Commit 5e3c61f98175 ("netfilter: conntrack: fix lookup race during hash resize"). And add a wrapper function nf_conntrack_get_ht to get hash and hsize suggested by Florian Westphal. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextDavid S. Miller2016-07-0617-321/+428
|\ | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pablo Neira Ayuso says: ==================== Netfilter updates for net-next The following patchset contains Netfilter updates for net-next, they are: 1) Don't use userspace datatypes in bridge netfilter code, from Tobin Harding. 2) Iterate only once over the expectation table when removing the helper module, instead of once per-netns, from Florian Westphal. 3) Extra sanitization in xt_hook_ops_alloc() to return error in case we ever pass zero hooks, xt_hook_ops_alloc(): 4) Handle NFPROTO_INET from the logging core infrastructure, from Liping Zhang. 5) Autoload loggers when TRACE target is used from rules, this doesn't change the behaviour in case the user already selected nfnetlink_log as preferred way to print tracing logs, also from Liping Zhang. 6) Conntrack slabs with SLAB_HWCACHE_ALIGN to allow rearranging fields by cache lines, increases the size of entries in 11% per entry. From Florian Westphal. 7) Skip zone comparison if CONFIG_NF_CONNTRACK_ZONES=n, from Florian. 8) Remove useless defensive check in nf_logger_find_get() from Shivani Bhardwaj. 9) Remove zone extension as place it in the conntrack object, this is always include in the hashing and we expect more intensive use of zones since containers are in place. Also from Florian Westphal. 10) Owner match now works from any namespace, from Eric Bierdeman. 11) Make sure we only reply with TCP reset to TCP traffic from nf_reject_ipv4, patch from Liping Zhang. 12) Introduce --nflog-size to indicate amount of network packet bytes that are copied to userspace via log message, from Vishwanath Pai. This obsoletes --nflog-range that has never worked, it was designed to achieve this but it has never worked. 13) Introduce generic macros for nf_tables object generation masks. 14) Use generation mask in table, chain and set objects in nf_tables. This allows fixes interferences with ongoing preparation phase of the commit protocol and object listings going on at the same time. This update is introduced in three patches, one per object. 15) Check if the object is active in the next generation for element deactivation in the rbtree implementation, given that deactivation happens from the commit phase path we have to observe the future status of the object. 16) Support for deletion of just added elements in the hash set type. 17) Allow to resize hashtable from /proc entry, not only from the obscure /sys entry that maps to the module parameter, from Florian Westphal. 18) Get rid of NFT_BASECHAIN_DISABLED, this code is not exercised anymore since we tear down the ruleset whenever the netdevice goes away. 19) Support for matching inverted set lookups, from Arturo Borrero. 20) Simplify the iptables_mangle_hook() by removing a superfluous extra branch. 21) Introduce ether_addr_equal_masked() and use it from the netfilter codebase, from Joe Perches. 22) Remove references to "Use netfilter MARK value as routing key" from the Netfilter Kconfig description given that this toggle doesn't exists already for 10 years, from Moritz Sichert. 23) Introduce generic NF_INVF() and use it from the xtables codebase, from Joe Perches. 24) Setting logger to NONE via /proc was not working unless explicit nul-termination was included in the string. This fixes seems to leave the former behaviour there, so we don't break backward. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
| * netfilter: nf_log: fix error on write NONE to logger choice sysctlPavel Tikhomirov2016-07-051-5/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | It is hard to unbind nf-logger: echo NONE > /proc/sys/net/netfilter/nf_log/0 bash: echo: write error: No such file or directory sysctl -w net.netfilter.nf_log.0=NONE sysctl: setting key "net.netfilter.nf_log.0": No such file or directory net.netfilter.nf_log.0 = NONE You need explicitly send '\0', for instance like: echo -e "NONE\0" > /proc/sys/net/netfilter/nf_log/0 That seem to be strange, so fix it using proc_dostring. Now it works fine: modprobe nfnetlink_log echo nfnetlink_log > /proc/sys/net/netfilter/nf_log/0 cat /proc/sys/net/netfilter/nf_log/0 nfnetlink_log echo NONE > /proc/sys/net/netfilter/nf_log/0 cat /proc/sys/net/netfilter/nf_log/0 NONE v2: add missed error check for proc_dostring Signed-off-by: Pavel Tikhomirov <ptikhomirov@virtuozzo.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: Convert FWINV<[foo]> macros and uses to NF_INVFJoe Perches2016-07-031-5/+2Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | netfilter uses multiple FWINV #defines with identical form that hide a specific structure variable and dereference it with a invflags member. $ git grep "#define FWINV" include/linux/netfilter_bridge/ebtables.h:#define FWINV(bool,invflg) ((bool) ^ !!(info->invflags & invflg)) net/bridge/netfilter/ebtables.c:#define FWINV2(bool, invflg) ((bool) ^ !!(e->invflags & invflg)) net/ipv4/netfilter/arp_tables.c:#define FWINV(bool, invflg) ((bool) ^ !!(arpinfo->invflags & (invflg))) net/ipv4/netfilter/ip_tables.c:#define FWINV(bool, invflg) ((bool) ^ !!(ipinfo->invflags & (invflg))) net/ipv6/netfilter/ip6_tables.c:#define FWINV(bool, invflg) ((bool) ^ !!(ip6info->invflags & (invflg))) net/netfilter/xt_tcpudp.c:#define FWINVTCP(bool, invflg) ((bool) ^ !!(tcpinfo->invflags & (invflg))) Consolidate these macros into a single NF_INVF macro. Miscellanea: o Neaten the alignment around these uses o A few lines are > 80 columns for intelligibility Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: Remove references to obsolete CONFIG_IP_ROUTE_FWMARKMoritz Sichert2016-07-011-6/+4Star
| | | | | | | | | | | | | | | | This option was removed in commit 47dcf0cb1005 ("[NET]: Rethink mark field in struct flowi"). Signed-off-by: Moritz Sichert <moritz+linux@sichert.me> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nf_tables: add support for inverted logic in nft_lookupArturo Borrero2016-06-241-5/+32
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduce a new configuration option for this expression, which allows users to invert the logic of set lookups. In _init() we will now return EINVAL if NFT_LOOKUP_F_INV is in anyway related to a map lookup. The code in the _eval() function has been untangled and updated to sopport the XOR of options, as we should consider 4 cases: * lookup false, invert false -> NFT_BREAK * lookup false, invert true -> return w/o NFT_BREAK * lookup true, invert false -> return w/o NFT_BREAK * lookup true, invert true -> NFT_BREAK Signed-off-by: Arturo Borrero Gonzalez <arturo.borrero.glez@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nf_tables: get rid of NFT_BASECHAIN_DISABLEDPablo Neira Ayuso2016-06-241-37/+25Star
| | | | | | | | | | | | | | | | | | | | | | | | | | This flag was introduced to restore rulesets from the new netdev family, but since 5ebe0b0eec9d6f7 ("netfilter: nf_tables: destroy basechain and rules on netdevice removal") the ruleset is released once the netdev is gone. This also removes nft_register_basechain() and nft_unregister_basechain() since they have no clients anymore after this rework. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: conntrack: allow increasing bucket size via sysctl tooFlorian Westphal2016-06-242-18/+59
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | No need to restrict this to module parameter. We export a copy of the real hash size -- when user alters the value we allocate the new table, copy entries etc before we update the real size to the requested one. This is also needed because the real size is used by concurrent readers and cannot be changed without synchronizing the conntrack generation seqcnt. We only allow changing this value from the initial net namespace. Tested using http-client-benchmark vs. httpterm with concurrent while true;do echo $RANDOM > /proc/sys/net/netfilter/nf_conntrack_buckets done Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nft_hash: support deletion of inactive elementsPablo Neira Ayuso2016-06-241-2/+4
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | New elements are inactive in the preparation phase, and its NFT_SET_ELEM_BUSY_MASK flag is set on. This busy flag doesn't allow us to delete it from the same transaction, following a sequence like: begin transaction add element X delete element X end transaction This sequence is valid and may be triggered by robots. To resolve this problem, allow deactivating elements that are active in the current generation (ie. those that has been just added in this batch). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nft_rbtree: check for next generation when deactivating elementsPablo Neira Ayuso2016-06-241-1/+1
| | | | | | | | | | | | | | | | set->ops->deactivate() is invoked from nft_del_setelem() that happens from the transaction path, so we have to check if the object is active in the next generation, not the current. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nf_tables: add generation mask to setsPablo Neira Ayuso2016-06-243-32/+49
| | | | | | | | | | | | Similar to ("netfilter: nf_tables: add generation mask to tables"). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nf_tables: add generation mask to chainsPablo Neira Ayuso2016-06-241-31/+58
| | | | | | | | | | | | Similar to ("netfilter: nf_tables: add generation mask to tables"). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nf_tables: add generation mask to tablesPablo Neira Ayuso2016-06-241-44/+57
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch addresses two problems: 1) The netlink dump is inconsistent when interfering with an ongoing transaction update for several reasons: 1.a) We don't honor the internal NFT_TABLE_INACTIVE flag, and we should be skipping these inactive objects in the dump. 1.b) We perform speculative deletion during the preparation phase, that may result in skipping active objects. 1.c) The listing order changes, which generates noise when tracking incremental ruleset update via tools like git or our own testsuite. 2) We don't allow to add and to update the object in the same batch, eg. add table x; add table x { flags dormant\; }. In order to resolve these problems: 1) If the user requests a deletion, the object becomes inactive in the next generation. Then, ignore objects that scheduled to be deleted from the lookup path, as they will be effectively removed in the next generation. 2) From the get/dump path, if the object is not currently active, we skip it. 3) Support 'add X -> update X' sequence from a transaction. After this update, we obtain a consistent list as long as we stay in the same generation. The userspace side can detect interferences through the generation counter so it can restart the dumping. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nf_tables: add generic macros to check for generation maskPablo Neira Ayuso2016-06-241-38/+8Star
| | | | | | | | | | | | | | | | Thus, we can reuse these to check the genmask of any object type, not only rules. This is required now that tables, chain and sets will get a generation mask field too in follow up patches. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: xt_NFLOG: nflog-range does not truncate packetsVishwanath Pai2016-06-242-3/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | li->u.ulog.copy_len is currently ignored by the kernel, we should truncate the packet to either li->u.ulog.copy_len (if set) or copy_range before sending it to userspace. 0 is a valid input for copy_len, so add a new flag to indicate whether this was option was specified by the user or not. Add two flags to indicate whether nflog-size/copy_len was set or not. XT_NFLOG_F_COPY_LEN is for XT_NFLOG and NFLOG_F_COPY_LEN for nfnetlink_log On the userspace side, this was initially represented by the option nflog-range, this will be replaced by --nflog-size now. --nflog-range would still exist but does not do anything. Reported-by: Joe Dollard <jdollard@akamai.com> Reviewed-by: Josh Hunt <johunt@akamai.com> Signed-off-by: Vishwanath Pai <vpai@akamai.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: Allow xt_owner in any user namespaceEric W. Biederman2016-06-231-6/+35
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Making this work is a little tricky as it really isn't kosher to change the xt_owner_match_info in a check function. Without changing xt_owner_match_info we need to know the user namespace the uids and gids are specified in. In the common case net->user_ns == current_user_ns(). Verify net->user_ns == current_user_ns() in owner_check so we can later assume it in owner_mt. In owner_check also verify that all of the uids and gids specified are in net->user_ns and that the expected min/max relationship exists between the uids and gids in xt_owner_match_info. In owner_mt get the network namespace from the outgoing socket, as this must be the same network namespace as the netfilter rules, and use that network namespace to find the user namespace the uids and gids in xt_match_owner_info are encoded in. Then convert from their encoded from into the kernel internal format for uids and gids and perform the owner match. Similar to ping_group_range, this code does not try to detect noncontiguous UID/GID ranges. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: Kevin Cernekee <cernekee@chromium.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: move zone info into struct nf_connFlorian Westphal2016-06-231-31/+2Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Curently we store zone information as a conntrack extension. This has one drawback: for every lookup we need to fetch the zone data from the extension area. This change place the zone data directly into the main conntrack object structure and then removes the zone conntrack extension. The zone data is just 4 bytes, it fits into a padding hole before the tuplehash info, so we do not even increase the nf_conn structure size. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nf_log: Remove NULL checkShivani Bhardwaj2016-06-231-1/+1
| | | | | | | | | | | | | | | | | | If 'logger' was NULL, there would be a direct jump to the label 'out', since it has already been checked for NULL, remove this unnecessary check. Signed-off-by: Shivani Bhardwaj <shivanib134@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: conntrack: align nf_conn on cacheline boundaryFlorian Westphal2016-06-231-1/+1
| | | | | | | | | | | | | | | | increases struct size by 32 bytes (288 -> 320), but it is the right thing, else any attempt to (re-)arrange nf_conn members by cacheline won't work. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: xt_TRACE: add explicitly nf_logger_find_get callLiping Zhang2016-06-231-6/+19
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Consider such situation, if nf_log_ipv4 kernel module is not installed, and the user add a following iptables rule: # iptables -t raw -I PREROUTING -j TRACE There will be no trace log generated until the user install nf_log_ipv4 module manully. So we should add request related nf_log module appropriately here. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: nf_log: handle NFPROTO_INET properly in nf_logger_[find_get|put]Liping Zhang2016-06-232-20/+21
| | | | | | | | | | | | | | When we request NFPROTO_INET, it means both NFPROTO_IPV4 and NFPROTO_IPV6. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: x_tables: fix possible ZERO_SIZE_PTR pointer dereferencing error.Xiubo Li2016-06-231-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Since we cannot make sure that the 'hook_mask' will always be none zero here. If it equals to zero, the num_hooks will be zero too, and then kmalloc() will return ZERO_SIZE_PTR, which is (void *)16. Then the following error check will fails: ops = kmalloc(sizeof(*ops) * num_hooks, GFP_KERNEL); if (ops == NULL) return ERR_PTR(-ENOMEM); So this patch will fix this with just doing the zero check before kmalloc() is called. Maybe the case above will never happen here, but in theory. Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * netfilter: helper: avoid extra expectation iterations on unregisterFlorian Westphal2016-06-071-29/+32
| | | | | | | | | | | | | | | | The expectation table is not duplicated per net namespace anymore, so we can move the expectation table and conntrack table iteration out of the per-net loop. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* | net: simplify and make pkt_type_ok() available for other usersJamal Hadi Salim2016-07-051-8/+1Star
| | | | | | | | | | | | | | Suggested-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: Jamal Hadi Salim <jhs@mojatatu.com> Acked-by: Daniel Borkmann <daniel@iogearbox.net> Signed-off-by: David S. Miller <davem@davemloft.net>
* | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2016-06-305-18/+16Star
|\ \ | | | | | | | | | | | | | | | | | | | | | Several cases of overlapping changes, except the packet scheduler conflicts which deal with the addition of the free list parameter to qdisc_enqueue(). Signed-off-by: David S. Miller <davem@davemloft.net>
| * | netfilter: nf_tables: fix a wrong check to skip the inactive rulesLiping Zhang2016-06-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | nft_genmask_cur has already done left-shift operator on the gencursor, so there's no need to do left-shift operator on it again. Fixes: ea4bd995b0f2 ("netfilter: nf_tables: add transaction helper functions") Cc: Patrick McHardy <kaber@trash.net> Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * | netfilter: nf_tables: fix wrong destroy anonymous sets if binding failsLiping Zhang2016-06-151-6/+1Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | When we add a nft rule like follows: # nft add rule filter test tcp dport vmap {1: jump test} -ELOOP error will be returned, and the anonymous set will be destroyed. But after that, nf_tables_abort will also try to remove the element and destroy the set, which was already destroyed and freed. If we add a nft wrong rule, nft_tables_abort will do the cleanup work rightly, so nf_tables_set_destroy call here is redundant and wrong, remove it. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * | netfilter: nf_tables: reject loops from set element jump to chainPablo Neira Ayuso2016-06-153-10/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Liping Zhang says: "Users may add such a wrong nft rules successfully, which will cause an endless jump loop: # nft add rule filter test tcp dport vmap {1: jump test} This is because before we commit, the element in the current anonymous set is inactive, so osp->walk will skip this element and miss the validate check." To resolve this problem, this patch passes the generation mask to the walk function through the iter container structure depending on the code path: 1) If we're dumping the elements, then we have to check if the element is active in the current generation. Thus, we check for the current bit in the genmask. 2) If we're checking for loops, then we have to check if the element is active in the next generation, as we're in the middle of a transaction. Thus, we check for the next bit in the genmask. Based on original patch from Liping Zhang. Reported-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org> Tested-by: Liping Zhang <liping.zhang@spreadtrum.com>
| * | netfilter: nf_tables: fix wrong check of NFT_SET_MAP in nf_tables_bind_setLiping Zhang2016-06-151-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | We should check "i" is used as a dictionary or not, "binding" is already checked before. Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * | netfilter: conntrack: destroy kmemcache on module removalFlorian Westphal2016-06-151-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | I forgot to move the kmem_cache_destroy into the exit path. Fixes: 0c5366b3a8c7 ("netfilter: conntrack: use single slab cache) Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* | | Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/netDavid S. Miller2016-06-1013-29/+40
|\| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Conflicts: net/sched/act_police.c net/sched/sch_drr.c net/sched/sch_hfsc.c net/sched/sch_prio.c net/sched/sch_red.c net/sched/sch_tbf.c In net-next the drop methods of the packet schedulers got removed, so the bug fixes to them in 'net' are irrelevant. A packet action unload crash fix conflicts with the addition of the new firstuse timestamp. Signed-off-by: David S. Miller <davem@davemloft.net>
| * | ipvs: update real-server binding of outgoing connections in SIP-peMarco Angaroni2016-06-062-4/+6
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Previous patch that introduced handling of outgoing packets in SIP persistent-engine did not call ip_vs_check_template() in case packet was matching a connection template. Assumption was that real-server was healthy, since it was sending a packet just in that moment. There are however real-server fault conditions requiring that association between call-id and real-server (represented by connection template) gets updated. Here is an example of the sequence of events: 1) RS1 is a back2back user agent that handled call-id1 and call-id2 2) RS1 is down and was marked as unavailable 3) new message from outside comes to IPVS with call-id1 4) IPVS reschedules the message to RS2, which becomes new call handler 5) RS2 forwards the message outside, translating call-id1 to call-id2 6) inside pe->conn_out() IPVS matches call-id2 with existing template 7) IPVS does not change association call-id2 <-> RS1 8) new message comes from client with call-id2 9) IPVS reschedules the message to a real-server potentially different from RS2, which is now the correct destination This patch introduces ip_vs_check_template() call in the handling of outgoing packets for SIP-pe. And also introduces a second optional argument for ip_vs_check_template() that allows to check if dest associated to a connection template is the same dest that was identified as the source of the packet. This is to change the real-server bound to a particular call-id independently from its availability status: the idea is that it's more reliable, for in->out direction (where internal network can be considered trusted), to always associate a call-id with the last real-server that used it in one of its messages. Think about above sequence of events where, just after step 5, RS1 returns instead to be available. Comparison of dests is done by simply comparing pointers to struct ip_vs_dest; there should be no cases where struct ip_vs_dest keeps its memory address, but represent a different real-server in terms of ip-address / port. Fixes: 39b972231536 ("ipvs: handle connections started by real-servers") Signed-off-by: Marco Angaroni <marcoangaroni@gmail.com> Acked-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Simon Horman <horms@verge.net.au>
| * | netfilter: x_tables: don't reject valid target size on some architecturesFlorian Westphal2016-06-021-2/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Quoting John Stultz: In updating a 32bit arm device from 4.6 to Linus' current HEAD, I noticed I was having some trouble with networking, and realized that /proc/net/ip_tables_names was suddenly empty. Digging through the registration process, it seems we're catching on the: if (strcmp(t->u.user.name, XT_STANDARD_TARGET) == 0 && target_offset + sizeof(struct xt_standard_target) != next_offset) return -EINVAL; Where next_offset seems to be 4 bytes larger then the offset + standard_target struct size. next_offset needs to be aligned via XT_ALIGN (so we can access all members of ip(6)t_entry struct). This problem didn't show up on i686 as it only needs 4-byte alignment for u64, but iptables userspace on other 32bit arches does insert extra padding. Reported-by: John Stultz <john.stultz@linaro.org> Tested-by: John Stultz <john.stultz@linaro.org> Fixes: 7ed2abddd20cf ("netfilter: x_tables: check standard target size too") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| * | Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nfDavid S. Miller2016-06-0210-23/+32
| |\ \ | | |/ | |/| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Pablo Neira Ayuso says: ==================== Netfilter fixes for net The following patchset contains Netfilter fixes for your net tree, they are: 1) Fix incorrect timestamp in nfnetlink_queue introduced when addressing y2038 safe timestamp, from Florian Westphal. 2) Get rid of leftover conntrack definition from the previous merge window, oneliner from Florian. 3) Make nf_queue handler pernet to resolve race on dereferencing the hook state structure with netns removal, from Eric Biederman. 4) Ensure clean exit on unregistered helper ports, from Taehee Yoo. 5) Restore FLOWI_FLAG_KNOWN_NH in nf_dup_ipv6. This got lost while generalizing xt_TEE to add packet duplication support in nf_tables, from Paolo Abeni. 6) Insufficient netlink NFTA_SET_TABLE attribute check in nf_tables_getset(), from Phil Turnbull. 7) Reject helper registration on duplicated ports via modparams. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
| | * netfilter: nf_ct_helper: bail out on duplicated helpersPablo Neira Ayuso2016-05-311-5/+4Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Don't allow registration of helpers using the same tuple: { l3proto, l4proto, src-port } We lookup for the helper from the packet path using this tuple through __nf_ct_helper_find(). Therefore, we have to avoid having two helpers with the same tuple to ensure predictible behaviour. Don't compare the helper string names anymore since it is valid to register two helpers with the same name, but using different tuples. This is also implicitly fixing up duplicated helper registration via ports= modparam since the name comparison was defeating the tuple duplication validation. Reported-by: Feng Gao <gfree.wind@gmail.com> Reported-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| | * netfilter: nf_tables: validate NFTA_SET_TABLE parameterPhil Turnbull2016-05-301-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | If the NFTA_SET_TABLE parameter is missing and the NLM_F_DUMP flag is not set, then a NULL pointer dereference is triggered in nf_tables_set_lookup because ctx.table is NULL. Signed-off-by: Phil Turnbull <phil.turnbull@oracle.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| | * netfilter: nf_ct_helper: Fix helper unregister count.Taehee Yoo2016-05-305-0/+5
| | | | | | | | | | | | | | | | | | | | | | | | | | | helpers should unregister the only registered ports. but, helper cannot have correct registered ports value when failed to register. Signed-off-by: Taehee Yoo <ap420073@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| | * netfilter: nf_queue: Make the queue_handler pernetEric W. Biederman2016-05-252-15/+20
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Florian Weber reported: > Under full load (unshare() in loop -> OOM conditions) we can > get kernel panic: > > BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 > IP: [<ffffffff81476c85>] nfqnl_nf_hook_drop+0x35/0x70 > [..] > task: ffff88012dfa3840 ti: ffff88012dffc000 task.ti: ffff88012dffc000 > RIP: 0010:[<ffffffff81476c85>] [<ffffffff81476c85>] nfqnl_nf_hook_drop+0x35/0x70 > RSP: 0000:ffff88012dfffd80 EFLAGS: 00010206 > RAX: 0000000000000008 RBX: ffffffff81add0c0 RCX: ffff88013fd80000 > [..] > Call Trace: > [<ffffffff81474d98>] nf_queue_nf_hook_drop+0x18/0x20 > [<ffffffff814738eb>] nf_unregister_net_hook+0xdb/0x150 > [<ffffffff8147398f>] netfilter_net_exit+0x2f/0x60 > [<ffffffff8141b088>] ops_exit_list.isra.4+0x38/0x60 > [<ffffffff8141b652>] setup_net+0xc2/0x120 > [<ffffffff8141bd09>] copy_net_ns+0x79/0x120 > [<ffffffff8106965b>] create_new_namespaces+0x11b/0x1e0 > [<ffffffff810698a7>] unshare_nsproxy_namespaces+0x57/0xa0 > [<ffffffff8104baa2>] SyS_unshare+0x1b2/0x340 > [<ffffffff81608276>] entry_SYSCALL_64_fastpath+0x1e/0xa8 > Code: 65 00 48 89 e5 41 56 41 55 41 54 53 83 e8 01 48 8b 97 70 12 00 00 48 98 49 89 f4 4c 8b 74 c2 18 4d 8d 6e 08 49 81 c6 88 00 00 00 <49> 8b 5d 00 48 85 db 74 1a 48 89 df 4c 89 e2 48 c7 c6 90 68 47 > The simple fix for this requires a new pernet variable for struct nf_queue that indicates when it is safe to use the dynamically allocated nf_queue state. As we need a variable anyway make nf_register_queue_handler and nf_unregister_queue_handler pernet. This allows the existing logic of when it is safe to use the state from the nfnetlink_queue module to be reused with no changes except for making it per net. The syncrhonize_rcu from nf_unregister_queue_handler is moved to a new function nfnl_queue_net_exit_batch so that the worst case of having a syncrhonize_rcu in the pernet exit path is not experienced in batch mode. Reported-by: Florian Westphal <fw@strlen.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| | * netfilter: conntrack: remove leftover binary sysctl defineFlorian Westphal2016-05-251-2/+0Star
| | | | | | | | | | | | | | | | | | | | | | | | Users got removed in f8572d8f2a2ba ("sysctl net: Remove unused binary sysctl code"). Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| | * netfilter: nfnetlink_queue: fix timestamp attributeFlorian Westphal2016-05-121-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | Since 4.4 we erronously use timestamp of the netlink skb (which is zero). Bugzilla: https://bugzilla.netfilter.org/show_bug.cgi?id=1066 Fixes: b28b1e826f818c30ea7 ("netfilter: nfnetlink_queue: use y2038 safe timestamp") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
* | | net: sched: do not acquire qdisc spinlock in qdisc/class stats dumpEric Dumazet2016-06-081-1/+1
|/ / | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Large tc dumps (tc -s {qdisc|class} sh dev ethX) done by Google BwE host agent [1] are problematic at scale : For each qdisc/class found in the dump, we currently lock the root qdisc spinlock in order to get stats. Sampling stats every 5 seconds from thousands of HTB classes is a challenge when the root qdisc spinlock is under high pressure. Not only the dumps take time, they also slow down the fast path (queue/dequeue packets) by 10 % to 20 % in some cases. An audit of existing qdiscs showed that sch_fq_codel is the only qdisc that might need the qdisc lock in fq_codel_dump_stats() and fq_codel_dump_class_stats() In v2 of this patch, I now use the Qdisc running seqcount to provide consistent reads of packets/bytes counters, regardless of 32/64 bit arches. I also changed rate estimators to use the same infrastructure so that they no longer need to lock root qdisc lock. [1] http://static.googleusercontent.com/media/research.google.com/en//pubs/archive/43838.pdf Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Cong Wang <xiyou.wangcong@gmail.com> Cc: Jamal Hadi Salim <jhs@mojatatu.com> Cc: John Fastabend <john.fastabend@gmail.com> Cc: Kevin Athey <kda@google.com> Cc: Xiaotian Pei <xiaotian@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: define gso types for IPx over IPv4 and IPv6Tom Herbert2016-05-211-10/+7Star
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch defines two new GSO definitions SKB_GSO_IPXIP4 and SKB_GSO_IPXIP6 along with corresponding NETIF_F_GSO_IPXIP4 and NETIF_F_GSO_IPXIP6. These are used to described IP in IP tunnel and what the outer protocol is. The inner protocol can be deduced from other GSO types (e.g. SKB_GSO_TCPV4 and SKB_GSO_TCPV6). The GSO types of SKB_GSO_IPIP and SKB_GSO_SIT are removed (these are both instances of SKB_GSO_IPXIP4). SKB_GSO_IPXIP6 will be used when support for GSO with IP encapsulation over IPv6 is added. Signed-off-by: Tom Herbert <tom@herbertland.com> Acked-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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