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2021-02-15netfilter: nftables: introduce table ownershipPablo Neira Ayuso1-46/+117
A userspace daemon like firewalld might need to monitor for netlink updates to detect its ruleset removal by the (global) flush ruleset command to ensure ruleset persistency. This adds extra complexity from userspace and, for some little time, the firewall policy is not in place. This patch adds the NFT_TABLE_F_OWNER flag which allows a userspace program to own the table that creates in exclusivity. Tables that are owned... - can only be updated and removed by the owner, non-owners hit EPERM if they try to update it or remove it. - are destroyed when the owner closes the netlink socket or the process is gone (implicit netlink socket closure). - are skipped by the global flush ruleset command. - are listed in the global ruleset. The userspace process that sets on the NFT_TABLE_F_OWNER flag need to leave open the netlink socket. A new NFTA_TABLE_OWNER netlink attribute specifies the netlink port ID to identify the owner from userspace. This patch also updates error reporting when an unknown table flag is specified to change it from EINVAL to EOPNOTSUPP given that EINVAL is usually reserved to report for malformed netlink messages to userspace. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-02-15netfilter: nftables: add helper function to release hooks of one single tablePablo Neira Ayuso1-5/+10
Add a function to release the hooks of one single table. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-02-15netfilter: nftables: add helper function to release one tablePablo Neira Ayuso1-35/+40
Add a function to release one table. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-02-10Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netDavid S. Miller4-24/+48
2021-02-09netfilter: nftables: relax check for stateful expressions in set definitionPablo Neira Ayuso1-13/+15
Restore the original behaviour where users are allowed to add an element with any stateful expression if the set definition specifies no stateful expressions. Make sure upper maximum number of stateful expressions of NFT_SET_EXPR_MAX is not reached. Fixes: 8cfd9b0f8515 ("netfilter: nftables: generalize set expressions support") Fixes: 48b0ae046ee9 ("netfilter: nftables: netlink support for several set element expressions") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-02-09netfilter: conntrack: skip identical origin tuple in same zone onlyFlorian Westphal1-1/+2
The origin skip check needs to re-test the zone. Else, we might skip a colliding tuple in the reply direction. This only occurs when using 'directional zones' where origin tuples reside in different zones but the reply tuples share the same zone. This causes the new conntrack entry to be dropped at confirmation time because NAT clash resolution was elided. Fixes: 4e35c1cb9460240 ("netfilter: nf_nat: skip nat clash resolution for same-origin entries") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-02-06Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextJakub Kicinski35-209/+368
Pablo Neira Ayuso says: ==================== Netfilter/IPVS updates for net-next 1) Remove indirection and use nf_ct_get() instead from nfnetlink_log and nfnetlink_queue, from Florian Westphal. 2) Add weighted random twos choice least-connection scheduling for IPVS, from Darby Payne. 3) Add a __hash placeholder in the flow tuple structure to identify the field to be included in the rhashtable key hash calculation. 4) Add a new nft_parse_register_load() and nft_parse_register_store() to consolidate register load and store in the core. 5) Statify nft_parse_register() since it has no more module clients. 6) Remove redundant assignment in nft_cmp, from Colin Ian King. * git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next: netfilter: nftables: remove redundant assignment of variable err netfilter: nftables: statify nft_parse_register() netfilter: nftables: add nft_parse_register_store() and use it netfilter: nftables: add nft_parse_register_load() and use it netfilter: flowtable: add hash offset field to tuple ipvs: add weighted random twos choice algorithm netfilter: ctnetlink: remove get_ct indirection ==================== Link: https://lore.kernel.org/r/20210206015005.23037-1-pablo@netfilter.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-02-06netfilter: nftables: remove redundant assignment of variable errColin Ian King1-3/+1
The variable err is being assigned a value that is never read, the same error number is being returned at the error return path via label err1. Clean up the code by removing the assignment. Addresses-Coverity: ("Unused value") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-02-04netfilter: move handlers to net/ip_vs.hLeon Romanovsky1-12/+0
Fix the following compilation warnings: net/netfilter/ipvs/ip_vs_proto_tcp.c:147:1: warning: no previous prototype for 'tcp_snat_handler' [-Wmissing-prototypes] 147 | tcp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp, | ^~~~~~~~~~~~~~~~ net/netfilter/ipvs/ip_vs_proto_udp.c:136:1: warning: no previous prototype for 'udp_snat_handler' [-Wmissing-prototypes] 136 | udp_snat_handler(struct sk_buff *skb, struct ip_vs_protocol *pp, | ^~~~~~~~~~~~~~~~ Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-02-04netfilter: flowtable: fix tcp and udp header checksum updateSven Auhagen1-2/+2
When updating the tcp or udp header checksum on port nat the function inet_proto_csum_replace2 with the last parameter pseudohdr as true. This leads to an error in the case that GRO is used and packets are split up in GSO. The tcp or udp checksum of all packets is incorrect. The error is probably masked due to the fact the most network driver implement tcp/udp checksum offloading. It also only happens when GRO is applied and not on single packets. The error is most visible when using a pppoe connection which is not triggering the tcp/udp checksum offload. Fixes: ac2a66665e23 ("netfilter: add generic flow table infrastructure") Signed-off-by: Sven Auhagen <sven.auhagen@voleatech.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-02-04netfilter: nftables: fix possible UAF over chains from packet path in netnsPablo Neira Ayuso1-6/+19
Although hooks are released via call_rcu(), chain and rule objects are immediately released while packets are still walking over these bits. This patch adds the .pre_exit callback which is invoked before synchronize_rcu() in the netns framework to stay safe. Remove a comment which is not valid anymore since the core does not use synchronize_net() anymore since 8c873e219970 ("netfilter: core: free hooks with call_rcu"). Suggested-by: Florian Westphal <fw@strlen.de> Fixes: df05ef874b28 ("netfilter: nf_tables: release objects on netns destruction") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-02-04netfilter: xt_recent: Fix attempt to update deleted entryJozsef Kadlecsik1-2/+10
When both --reap and --update flag are specified, there's a code path at which the entry to be updated is reaped beforehand, which then leads to kernel crash. Reap only entries which won't be updated. Fixes kernel bugzilla #207773. Link: https://bugzilla.kernel.org/show_bug.cgi?id=207773 Reported-by: Reindl Harald <h.reindl@thelounge.net> Fixes: 0079c5aee348 ("netfilter: xt_recent: add an entry reaper") Signed-off-by: Jozsef Kadlecsik <kadlec@netfilter.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-28Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski2-18/+28
drivers/net/can/dev.c b552766c872f ("can: dev: prevent potential information leak in can_fill_info()") 3e77f70e7345 ("can: dev: move driver related infrastructure into separate subdir") 0a042c6ec991 ("can: dev: move netlink related code into seperate file") Code move. drivers/net/ethernet/mellanox/mlx5/core/en_ethtool.c 57ac4a31c483 ("net/mlx5e: Correctly handle changing the number of queues when the interface is down") 214baf22870c ("net/mlx5e: Support HTB offload") Adjacent code changes net/switchdev/switchdev.c 20776b465c0c ("net: switchdev: don't set port_obj_info->handled true when -EOPNOTSUPP") ffb68fc58e96 ("net: switchdev: remove the transaction structure from port object notifiers") bae33f2b5afe ("net: switchdev: remove the transaction structure from port attributes") Transaction parameter gets dropped otherwise keep the fix. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-27net: remove redundant 'depends on NET'Masahiro Yamada2-2/+2
These Kconfig files are included from net/Kconfig, inside the if NET ... endif. Remove 'depends on NET', which we know it is already met. Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Link: https://lore.kernel.org/r/20210125232026.106855-1-masahiroy@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2021-01-27netfilter: nftables: statify nft_parse_register()Pablo Neira Ayuso1-2/+1
This function is not used anymore by any extension, statify it. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-27netfilter: nftables: add nft_parse_register_store() and use itPablo Neira Ayuso17-80/+89
This new function combines the netlink register attribute parser and the store validation function. This update requires to replace: enum nft_registers dreg:8; in many of the expression private areas otherwise compiler complains with: error: cannot take address of bit-field ‘dreg’ when passing the register field as reference. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-27netfilter: nftables: add nft_parse_register_load() and use itPablo Neira Ayuso20-112/+109
This new function combines the netlink register attribute parser and the load validation function. This update requires to replace: enum nft_registers sreg:8; in many of the expression private areas otherwise compiler complains with: error: cannot take address of bit-field ‘sreg’ when passing the register field as reference. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-26netfilter: flowtable: add hash offset field to tuplePablo Neira Ayuso1-3/+3
Add a placeholder field to calculate hash tuple offset. Similar to 2c407aca6497 ("netfilter: conntrack: avoid gcc-10 zero-length-bounds warning"). Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-26ipvs: add weighted random twos choice algorithmDarby Payne3-0/+151
Adds the random twos choice load-balancing algorithm. The algorithm will pick two random servers based on weights. Then select the server with the least amount of connections normalized by weight. The algorithm avoids the "herd behavior" problem. The algorithm comes from a paper by Michael Mitzenmacher available here http://www.eecs.harvard.edu/~michaelm/NEWWORK/postscripts/twosurvey.pdf Signed-off-by: Darby Payne <darby.payne@gmail.com> Acked-by: Julian Anastasov <ja@ssi.bg> Acked-by: Simon Horman <horms@verge.net.au> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-25netfilter: ctnetlink: remove get_ct indirectionFlorian Westphal3-10/+15
Use nf_ct_get() directly, its a small inline helper without dependencies. Add CONFIG_NF_CONNTRACK guards to elide the relevant part when conntrack isn't available at all. v2: add ifdef guard around nf_ct_get call (kernel test robot) Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-16netfilter: nft_dynset: dump expressions when set definition contains no expressionsPablo Neira Ayuso1-14/+17
If the set definition provides no stateful expressions, then include the stateful expression in the ruleset listing. Without this fix, the dynset rule listing shows the stateful expressions provided by the set definition. Fixes: 65038428b2c6 ("netfilter: nf_tables: allow to specify stateful expression in set definition") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-16netfilter: nft_dynset: add timeout extension to templatePablo Neira Ayuso1-1/+3
Otherwise, the newly create element shows no timeout when listing the ruleset. If the set definition does not specify a default timeout, then the set element only shows the expiration time, but not the timeout. This is a problem when restoring a stateful ruleset listing since it skips the timeout policy entirely. Fixes: 22fe54d5fefc ("netfilter: nf_tables: add support for dynamic set updates") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-16netfilter: nft_dynset: honor stateful expressions in set definitionPablo Neira Ayuso2-3/+8
If the set definition contains stateful expressions, allocate them for the newly added entries from the packet path. Fixes: 65038428b2c6 ("netfilter: nf_tables: allow to specify stateful expression in set definition") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-11netfilter: nf_nat: Fix memleak in nf_nat_initDinghao Liu1-0/+1
When register_pernet_subsys() fails, nf_nat_bysource should be freed just like when nf_ct_extend_register() fails. Fixes: 1cd472bf036ca ("netfilter: nf_nat: add nat hook register functions to nf_nat") Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2021-01-10netfilter: conntrack: fix reading nf_conntrack_bucketsJesper Dangaard Brouer1-0/+3
The old way of changing the conntrack hashsize runtime was through changing the module param via file /sys/module/nf_conntrack/parameters/hashsize. This was extended to sysctl change in commit 3183ab8997a4 ("netfilter: conntrack: allow increasing bucket size via sysctl too"). The commit introduced second "user" variable nf_conntrack_htable_size_user which shadow actual variable nf_conntrack_htable_size. When hashsize is changed via module param this "user" variable isn't updated. This results in sysctl net/netfilter/nf_conntrack_buckets shows the wrong value when users update via the old way. This patch fix the issue by always updating "user" variable when reading the proc file. This will take care of changes to the actual variable without sysctl need to be aware. Fixes: 3183ab8997a4 ("netfilter: conntrack: allow increasing bucket size via sysctl too") Reported-by: Yoel Caspersen <yoel@kviknet.dk> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-28netfilter: nftables: add set expression flagsPablo Neira Ayuso2-3/+12
The set flag NFT_SET_EXPR provides a hint to the kernel that userspace supports for multiple expressions per set element. In the same direction, NFT_DYNSET_F_EXPR specifies that dynset expression defines multiple expressions per set element. This allows new userspace software with old kernels to bail out with EOPNOTSUPP. This update is similar to ef516e8625dd ("netfilter: nf_tables: reintroduce the NFT_SET_CONCAT flag"). The NFT_SET_EXPR flag needs to be set on when the NFTA_SET_EXPRESSIONS attribute is specified. The NFT_SET_EXPR flag is not set on with NFTA_SET_EXPR to retain backward compatibility in old userspace binaries. Fixes: 48b0ae046ee9 ("netfilter: nftables: netlink support for several set element expressions") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-28netfilter: nft_dynset: report EOPNOTSUPP on missing set featurePablo Neira Ayuso1-3/+3
If userspace requests a feature which is not available the original set definition, then bail out with EOPNOTSUPP. If userspace sends unsupported dynset flags (new feature not supported by this kernel), then report EOPNOTSUPP to userspace. EINVAL should be only used to report malformed netlink messages from userspace. Fixes: 22fe54d5fefc ("netfilter: nf_tables: add support for dynamic set updates") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-27netfilter: xt_RATEEST: reject non-null terminated string from userspaceFlorian Westphal1-0/+3
syzbot reports: detected buffer overflow in strlen [..] Call Trace: strlen include/linux/string.h:325 [inline] strlcpy include/linux/string.h:348 [inline] xt_rateest_tg_checkentry+0x2a5/0x6b0 net/netfilter/xt_RATEEST.c:143 strlcpy assumes src is a c-string. Check info->name before its used. Reported-by: syzbot+e86f7c428c8c50db65b4@syzkaller.appspotmail.com Fixes: 5859034d7eb8793 ("[NETFILTER]: x_tables: add RATEEST target") Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-18Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nfJakub Kicinski2-26/+20
Pablo Neira Ayuso says: ==================== Netfilter fixes for net 1) Incorrect loop in error path of nft_set_elem_expr_clone(), from Colin Ian King. 2) Missing xt_table_get_private_protected() to access table private data in x_tables, from Subash Abhinov Kasiviswanathan. 3) Possible oops in ipset hash type resize, from Vasily Averin. 4) Fix shift-out-of-bounds in ipset hash type, also from Vasily. * git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf: netfilter: ipset: fix shift-out-of-bounds in htable_bits() netfilter: ipset: fixes possible oops in mtype_resize netfilter: x_tables: Update remaining dereference to RCU netfilter: nftables: fix incorrect increment of loop counter ==================== Link: https://lore.kernel.org/r/20201218120409.3659-1-pablo@netfilter.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-17netfilter: ipset: fix shift-out-of-bounds in htable_bits()Vasily Averin1-15/+5
htable_bits() can call jhash_size(32) and trigger shift-out-of-bounds UBSAN: shift-out-of-bounds in net/netfilter/ipset/ip_set_hash_gen.h:151:6 shift exponent 32 is too large for 32-bit type 'unsigned int' CPU: 0 PID: 8498 Comm: syz-executor519 Not tainted 5.10.0-rc7-next-20201208-syzkaller #0 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:120 ubsan_epilogue+0xb/0x5a lib/ubsan.c:148 __ubsan_handle_shift_out_of_bounds.cold+0xb1/0x181 lib/ubsan.c:395 htable_bits net/netfilter/ipset/ip_set_hash_gen.h:151 [inline] hash_mac_create.cold+0x58/0x9b net/netfilter/ipset/ip_set_hash_gen.h:1524 ip_set_create+0x610/0x1380 net/netfilter/ipset/ip_set_core.c:1115 nfnetlink_rcv_msg+0xecc/0x1180 net/netfilter/nfnetlink.c:252 netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2494 nfnetlink_rcv+0x1ac/0x420 net/netfilter/nfnetlink.c:600 netlink_unicast_kernel net/netlink/af_netlink.c:1304 [inline] netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1330 netlink_sendmsg+0x907/0xe40 net/netlink/af_netlink.c:1919 sock_sendmsg_nosec net/socket.c:652 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:672 ____sys_sendmsg+0x6e8/0x810 net/socket.c:2345 ___sys_sendmsg+0xf3/0x170 net/socket.c:2399 __sys_sendmsg+0xe5/0x1b0 net/socket.c:2432 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 This patch replaces htable_bits() by simple fls(hashsize - 1) call: it alone returns valid nbits both for round and non-round hashsizes. It is normal to set any nbits here because it is validated inside following htable_size() call which returns 0 for nbits>31. Fixes: 1feab10d7e6d("netfilter: ipset: Unified hash type generation") Reported-by: syzbot+d66bfadebca46cf61a2b@syzkaller.appspotmail.com Signed-off-by: Vasily Averin <vvs@virtuozzo.com> Acked-by: Jozsef Kadlecsik <kadlec@netfilter.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-17netfilter: ipset: fixes possible oops in mtype_resizeVasily Averin1-9/+13
currently mtype_resize() can cause oops t = ip_set_alloc(htable_size(htable_bits)); if (!t) { ret = -ENOMEM; goto out; } t->hregion = ip_set_alloc(ahash_sizeof_regions(htable_bits)); Increased htable_bits can force htable_size() to return 0. In own turn ip_set_alloc(0) returns not 0 but ZERO_SIZE_PTR, so follwoing access to t->hregion should trigger an OOPS. Signed-off-by: Vasily Averin <vvs@virtuozzo.com> Acked-by: Jozsef Kadlecsik <kadlec@netfilter.org> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-16Merge tag 'selinux-pr-20201214' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinuxLinus Torvalds1-1/+1
Pull selinux updates from Paul Moore: "While we have a small number of SELinux patches for v5.11, there are a few changes worth highlighting: - Change the LSM network hooks to pass flowi_common structs instead of the parent flowi struct as the LSMs do not currently need the full flowi struct and they do not have enough information to use it safely (missing information on the address family). This patch was discussed both with Herbert Xu (representing team netdev) and James Morris (representing team LSMs-other-than-SELinux). - Fix how we handle errors in inode_doinit_with_dentry() so that we attempt to properly label the inode on following lookups instead of continuing to treat it as unlabeled. - Tweak the kernel logic around allowx, auditallowx, and dontauditx SELinux policy statements such that the auditx/dontauditx are effective even without the allowx statement. Everything passes our test suite" * tag 'selinux-pr-20201214' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/selinux: lsm,selinux: pass flowi_common instead of flowi to the LSM hooks selinux: Fix fall-through warnings for Clang selinux: drop super_block backpointer from superblock_security_struct selinux: fix inode_doinit_with_dentry() LABEL_INVALID error handling selinux: allow dontauditx and auditallowx rules to take effect without allowx selinux: fix error initialization in inode_doinit_with_dentry()
2020-12-16netfilter: nftables: fix incorrect increment of loop counterColin Ian King1-2/+2
The intention of the err_expr cleanup path is to iterate over the allocated expr_array objects and free them, starting from i - 1 and working down to the start of the array. Currently the loop counter is being incremented instead of decremented and also the index i is being used instead of k, repeatedly destroying the same expr_array element. Fix this by decrementing k and using k as the index into expr_array. Addresses-Coverity: ("Infinite loop") Fixes: 8cfd9b0f8515 ("netfilter: nftables: generalize set expressions support") Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-14Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-nextJakub Kicinski12-105/+450
Pablo Neira Ayuso says: ==================== Netfilter/IPVS updates for net-next 1) Missing dependencies in NFT_BRIDGE_REJECT, from Randy Dunlap. 2) Use atomic_inc_return() instead of atomic_add_return() in IPVS, from Yejune Deng. 3) Simplify check for overquota in xt_nfacct, from Kaixu Xia. 4) Move nfnl_acct_list away from struct net, from Miao Wang. 5) Pass actual sk in reject actions, from Jan Engelhardt. 6) Add timeout and protoinfo to ctnetlink destroy events, from Florian Westphal. 7) Four patches to generalize set infrastructure to support for multiple expressions per set element. * git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next: netfilter: nftables: netlink support for several set element expressions netfilter: nftables: generalize set extension to support for several expressions netfilter: nftables: move nft_expr before nft_set netfilter: nftables: generalize set expressions support netfilter: ctnetlink: add timeout and protoinfo to destroy events netfilter: use actual socket sk for REJECT action netfilter: nfnl_acct: remove data from struct net netfilter: Remove unnecessary conversion to bool ipvs: replace atomic_add_return() netfilter: nft_reject_bridge: fix build errors due to code movement ==================== Link: https://lore.kernel.org/r/20201212230513.3465-1-pablo@netfilter.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-12netfilter: nftables: netlink support for several set element expressionsPablo Neira Ayuso2-6/+143
This patch adds three new netlink attributes to encapsulate a list of expressions per set elements: - NFTA_SET_EXPRESSIONS: this attribute provides the set definition in terms of expressions. New set elements get attached the list of expressions that is specified by this new netlink attribute. - NFTA_SET_ELEM_EXPRESSIONS: this attribute allows users to restore (or initialize) the stateful information of set elements when adding an element to the set. - NFTA_DYNSET_EXPRESSIONS: this attribute specifies the list of expressions that the set element gets when it is inserted from the packet path. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-12netfilter: nftables: generalize set extension to support for several expressionsPablo Neira Ayuso3-47/+168
This patch replaces NFT_SET_EXPR by NFT_SET_EXT_EXPRESSIONS. This new extension allows to attach several expressions to one set element (not only one single expression as NFT_SET_EXPR provides). This patch prepares for support for several expressions per set element in the netlink userspace API. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-12netfilter: nftables: generalize set expressions supportPablo Neira Ayuso2-27/+66
Currently, the set infrastucture allows for one single expressions per element. This patch extends the existing infrastructure to allow for up to two expressions. This is not updating the netlink API yet, this is coming as an initial preparation patch. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-12netfilter: ctnetlink: add timeout and protoinfo to destroy eventsFlorian Westphal4-22/+48
DESTROY events do not include the remaining timeout. Add the timeout if the entry was removed explicitly. This can happen when a conntrack gets deleted prematurely, e.g. due to a tcp reset, module removal, netdev notifier (nat/masquerade device went down), ctnetlink and so on. Add the protocol state too for the destroy message to check for abnormal state on connection termination. Joint work with Pablo. Signed-off-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-11Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski4-41/+26
xdp_return_frame_bulk() needs to pass a xdp_buff to __xdp_return(). strlcpy got converted to strscpy but here it makes no functional difference, so just keep the right code. Conflicts: net/netfilter/nf_tables_api.c Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-09netfilter: nft_ct: Remove confirmation check for NFT_CT_IDBrett Mastbergen1-2/+0
Since commit 656c8e9cc1ba ("netfilter: conntrack: Use consistent ct id hash calculation") the ct id will not change from initialization to confirmation. Removing the confirmation check allows for things like adding an element to a 'typeof ct id' set in prerouting upon reception of the first packet of a new connection, and then being able to reference that set consistently both before and after the connection is confirmed. Fixes: 656c8e9cc1ba ("netfilter: conntrack: Use consistent ct id hash calculation") Signed-off-by: Brett Mastbergen <brett.mastbergen@gmail.com> Acked-by: Florian Westphal <fw@strlen.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-08netfilter: nftables: comment indirect serialization of commit_mutex with rtnl_mutexPablo Neira Ayuso1-0/+4
Add an explicit comment in the code to describe the indirect serialization of the holders of the commit_mutex with the rtnl_mutex. Commit 90d2723c6d4c ("netfilter: nf_tables: do not hold reference on netdevice from preparation phase") already describes this, but a comment in this case is better for reference. Reported-by: Vladimir Oltean <olteanv@gmail.com> Reviewed-by: Vladimir Oltean <olteanv@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-08netfilter: nft_dynset: fix timeouts later than 23 daysPablo Neira Ayuso2-5/+7
Use nf_msecs_to_jiffies64 and nf_jiffies64_to_msecs as provided by 8e1102d5a159 ("netfilter: nf_tables: support timeouts larger than 23 days"), otherwise ruleset listing breaks. Fixes: a8b1e36d0d1d ("netfilter: nft_dynset: fix element timeout for HZ != 1000") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-08netfilter: x_tables: Switch synchronization to RCUSubash Abhinov Kasiviswanathan1-34/+15
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>
2020-12-03Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski7-38/+110
Conflicts: drivers/net/ethernet/ibm/ibmvnic.c Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2020-12-01netfilter: use actual socket sk for REJECT actionJan Engelhardt1-2/+4
True to the message of commit v5.10-rc1-105-g46d6c5ae953c, _do_ actually make use of state->sk when possible, such as in the REJECT modules. Reported-by: Minqiang Chen <ptpt52@gmail.com> Cc: Jason A. Donenfeld <Jason@zx2c4.com> Signed-off-by: Jan Engelhardt <jengelh@inai.de> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-01netfilter: nfnl_acct: remove data from struct netWang Shanker1-9/+29
This patch removes nfnl_acct_list from struct net to reduce the default memory footprint for the netns structure. Signed-off-by: Miao Wang <shankerwangmiao@gmail.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-12-01netfilter: Remove unnecessary conversion to boolKaixu Xia1-1/+1
Here we could use the '!=' expression to fix the following coccicheck warning: ./net/netfilter/xt_nfacct.c:30:41-46: WARNING: conversion to bool not needed here Reported-by: Tosk Robot <tencent_os_robot@tencent.com> Signed-off-by: Kaixu Xia <kaixuxia@tencent.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-11-27netfilter: nftables_offload: build mask based from the matching bytesPablo Neira Ayuso3-29/+61
Userspace might match on prefix bytes of header fields if they are on the byte boundary, this requires that the mask is adjusted accordingly. Use NFT_OFFLOAD_MATCH_EXACT() for meta since prefix byte matching is not allowed for this type of selector. The bitwise expression might be optimized out by userspace, hence the kernel needs to infer the prefix from the number of payload bytes to match on. This patch adds nft_payload_offload_mask() to calculate the bitmask to match on the prefix. Fixes: c9626a2cbdb2 ("netfilter: nf_tables: add hardware offload support") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-11-27netfilter: nftables_offload: set address type in control dissectorPablo Neira Ayuso2-0/+21
This patch adds nft_flow_rule_set_addr_type() to set the address type from the nft_payload expression accordingly. If the address type is not set in the control dissector then a rule that matches either on source or destination IP address does not work. After this patch, nft hardware offload generates the flow dissector configuration as tc-flower does to match on an IP address. This patch has been also tested functionally to make sure packets are filtered out by the NIC. This is also getting the code aligned with the existing netfilter flow offload infrastructure which is also setting the control dissector. Fixes: c9626a2cbdb2 ("netfilter: nf_tables: add hardware offload support") Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2020-11-27ipvs: fix possible memory leak in ip_vs_control_net_initWang Hai1-6/+25
kmemleak report a memory leak as follows: BUG: memory leak unreferenced object 0xffff8880759ea000 (size 256): backtrace: [<00000000c0bf2deb>] kmem_cache_zalloc include/linux/slab.h:656 [inline] [<00000000c0bf2deb>] __proc_create+0x23d/0x7d0 fs/proc/generic.c:421 [<000000009d718d02>] proc_create_reg+0x8e/0x140 fs/proc/generic.c:535 [<0000000097bbfc4f>] proc_create_net_data+0x8c/0x1b0 fs/proc/proc_net.c:126 [<00000000652480fc>] ip_vs_control_net_init+0x308/0x13a0 net/netfilter/ipvs/ip_vs_ctl.c:4169 [<000000004c927ebe>] __ip_vs_init+0x211/0x400 net/netfilter/ipvs/ip_vs_core.c:2429 [<00000000aa6b72d9>] ops_init+0xa8/0x3c0 net/core/net_namespace.c:151 [<00000000153fd114>] setup_net+0x2de/0x7e0 net/core/net_namespace.c:341 [<00000000be4e4f07>] copy_net_ns+0x27d/0x530 net/core/net_namespace.c:482 [<00000000f1c23ec9>] create_new_namespaces+0x382/0xa30 kernel/nsproxy.c:110 [<00000000098a5757>] copy_namespaces+0x2e6/0x3b0 kernel/nsproxy.c:179 [<0000000026ce39e9>] copy_process+0x220a/0x5f00 kernel/fork.c:2072 [<00000000b71f4efe>] _do_fork+0xc7/0xda0 kernel/fork.c:2428 [<000000002974ee96>] __do_sys_clone3+0x18a/0x280 kernel/fork.c:2703 [<0000000062ac0a4d>] do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46 [<0000000093f1ce2c>] entry_SYSCALL_64_after_hwframe+0x44/0xa9 In the error path of ip_vs_control_net_init(), remove_proc_entry() needs to be called to remove the added proc entry, otherwise a memory leak will occur. Also, add some '#ifdef CONFIG_PROC_FS' because proc_create_net* return NULL when PROC is not used. Fixes: b17fc9963f83 ("IPVS: netns, ip_vs_stats and its procfs") Fixes: 61b1ab4583e2 ("IPVS: netns, add basic init per netns.") Reported-by: Hulk Robot <hulkci@huawei.com> Signed-off-by: Wang Hai <wanghai38@huawei.com> Acked-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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