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2023-04-06xfrm: Zero padding when dumping algos and encapHerbert Xu1-4/+41
[ Upstream commit 8222d5910dae08213b6d9d4bc9a7f8502855e624 ] When copying data to user-space we should ensure that only valid data is copied over. Padding in structures may be filled with random (possibly sensitve) data and should never be given directly to user-space. This patch fixes the copying of xfrm algorithms and the encap template in xfrm_user so that padding is zeroed. Reported-by: syzbot+fa5414772d5c445dac3c@syzkaller.appspotmail.com Reported-by: Hyunwoo Kim <v4bel@theori.io> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Reviewed-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-03-22xfrm: Allow transport-mode states with AF_UNSPEC selectorHerbert Xu1-5/+0
[ Upstream commit c276a706ea1f51cf9723ed8484feceaf961b8f89 ] xfrm state selectors are matched against the inner-most flow which can be of any address family. Therefore middle states in nested configurations need to carry a wildcard selector in order to work at all. However, this is currently forbidden for transport-mode states. Fix this by removing the unnecessary check. Fixes: 13996378e658 ("[IPSEC]: Rename mode to outer_mode and add inner_mode") Reported-by: David George <David.George@sophos.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-03-03Fix XFRM-I support for nested ESP tunnelsBenedict Wong2-4/+53
[ Upstream commit b0355dbbf13c0052931dd14c38c789efed64d3de ] This change adds support for nested IPsec tunnels by ensuring that XFRM-I verifies existing policies before decapsulating a subsequent policies. Addtionally, this clears the secpath entries after policies are verified, ensuring that previous tunnels with no-longer-valid do not pollute subsequent policy checks. This is necessary especially for nested tunnels, as the IP addresses, protocol and ports may all change, thus not matching the previous policies. In order to ensure that packets match the relevant inbound templates, the xfrm_policy_check should be done before handing off to the inner XFRM protocol to decrypt and decapsulate. Notably, raw ESP/AH packets did not perform policy checks inherently, whereas all other encapsulated packets (UDP, TCP encapsulated) do policy checks after calling xfrm_input handling in the respective encapsulation layer. Test: Verified with additional Android Kernel Unit tests Signed-off-by: Benedict Wong <benedictwong@google.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-02-14xfrm: fix bug with DSCP copy to v6 from v4 tunnelChristian Hopps1-2/+1
[ Upstream commit 6028da3f125fec34425dbd5fec18e85d372b2af6 ] When copying the DSCP bits for decap-dscp into IPv6 don't assume the outer encap is always IPv6. Instead, as with the inner IPv4 case, copy the DSCP bits from the correctly saved "tos" value in the control block. Fixes: 227620e29509 ("[IPSEC]: Separate inner/outer mode processing on input") Signed-off-by: Christian Hopps <chopps@chopps.org> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-02-14xfrm: annotate data-race around use_timeEric Dumazet2-9/+12
[ Upstream commit 0a9e5794b21e2d1303759ff8fe5f9215db7757ba ] KCSAN reported multiple cpus can update use_time at the same time. Adds READ_ONCE()/WRITE_ONCE() annotations. Note that 32bit arches are not fully protected, but they will probably no longer be supported/used in 2106. BUG: KCSAN: data-race in __xfrm_policy_check / __xfrm_policy_check write to 0xffff88813e7ec108 of 8 bytes by interrupt on cpu 0: __xfrm_policy_check+0x6ae/0x17f0 net/xfrm/xfrm_policy.c:3664 __xfrm_policy_check2 include/net/xfrm.h:1174 [inline] xfrm_policy_check include/net/xfrm.h:1179 [inline] xfrm6_policy_check+0x2e9/0x320 include/net/xfrm.h:1189 udpv6_queue_rcv_one_skb+0x48/0xa30 net/ipv6/udp.c:703 udpv6_queue_rcv_skb+0x2d6/0x310 net/ipv6/udp.c:792 udp6_unicast_rcv_skb+0x16b/0x190 net/ipv6/udp.c:935 __udp6_lib_rcv+0x84b/0x9b0 net/ipv6/udp.c:1020 udpv6_rcv+0x4b/0x50 net/ipv6/udp.c:1133 ip6_protocol_deliver_rcu+0x99e/0x1020 net/ipv6/ip6_input.c:439 ip6_input_finish net/ipv6/ip6_input.c:484 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ip6_input+0xca/0x180 net/ipv6/ip6_input.c:493 dst_input include/net/dst.h:454 [inline] ip6_rcv_finish+0x1e9/0x2d0 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:302 [inline] ipv6_rcv+0x85/0x140 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core net/core/dev.c:5482 [inline] __netif_receive_skb+0x8b/0x1b0 net/core/dev.c:5596 process_backlog+0x23f/0x3b0 net/core/dev.c:5924 __napi_poll+0x65/0x390 net/core/dev.c:6485 napi_poll net/core/dev.c:6552 [inline] net_rx_action+0x37e/0x730 net/core/dev.c:6663 __do_softirq+0xf2/0x2c7 kernel/softirq.c:571 do_softirq+0xb1/0xf0 kernel/softirq.c:472 __local_bh_enable_ip+0x6f/0x80 kernel/softirq.c:396 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline] _raw_read_unlock_bh+0x17/0x20 kernel/locking/spinlock.c:284 wg_socket_send_skb_to_peer+0x107/0x120 drivers/net/wireguard/socket.c:184 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x142/0x360 drivers/net/wireguard/send.c:276 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289 worker_thread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 write to 0xffff88813e7ec108 of 8 bytes by interrupt on cpu 1: __xfrm_policy_check+0x6ae/0x17f0 net/xfrm/xfrm_policy.c:3664 __xfrm_policy_check2 include/net/xfrm.h:1174 [inline] xfrm_policy_check include/net/xfrm.h:1179 [inline] xfrm6_policy_check+0x2e9/0x320 include/net/xfrm.h:1189 udpv6_queue_rcv_one_skb+0x48/0xa30 net/ipv6/udp.c:703 udpv6_queue_rcv_skb+0x2d6/0x310 net/ipv6/udp.c:792 udp6_unicast_rcv_skb+0x16b/0x190 net/ipv6/udp.c:935 __udp6_lib_rcv+0x84b/0x9b0 net/ipv6/udp.c:1020 udpv6_rcv+0x4b/0x50 net/ipv6/udp.c:1133 ip6_protocol_deliver_rcu+0x99e/0x1020 net/ipv6/ip6_input.c:439 ip6_input_finish net/ipv6/ip6_input.c:484 [inline] NF_HOOK include/linux/netfilter.h:302 [inline] ip6_input+0xca/0x180 net/ipv6/ip6_input.c:493 dst_input include/net/dst.h:454 [inline] ip6_rcv_finish+0x1e9/0x2d0 net/ipv6/ip6_input.c:79 NF_HOOK include/linux/netfilter.h:302 [inline] ipv6_rcv+0x85/0x140 net/ipv6/ip6_input.c:309 __netif_receive_skb_one_core net/core/dev.c:5482 [inline] __netif_receive_skb+0x8b/0x1b0 net/core/dev.c:5596 process_backlog+0x23f/0x3b0 net/core/dev.c:5924 __napi_poll+0x65/0x390 net/core/dev.c:6485 napi_poll net/core/dev.c:6552 [inline] net_rx_action+0x37e/0x730 net/core/dev.c:6663 __do_softirq+0xf2/0x2c7 kernel/softirq.c:571 do_softirq+0xb1/0xf0 kernel/softirq.c:472 __local_bh_enable_ip+0x6f/0x80 kernel/softirq.c:396 __raw_read_unlock_bh include/linux/rwlock_api_smp.h:257 [inline] _raw_read_unlock_bh+0x17/0x20 kernel/locking/spinlock.c:284 wg_socket_send_skb_to_peer+0x107/0x120 drivers/net/wireguard/socket.c:184 wg_packet_create_data_done drivers/net/wireguard/send.c:251 [inline] wg_packet_tx_worker+0x142/0x360 drivers/net/wireguard/send.c:276 process_one_work+0x3d3/0x720 kernel/workqueue.c:2289 worker_thread+0x618/0xa70 kernel/workqueue.c:2436 kthread+0x1a9/0x1e0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 value changed: 0x0000000063c62d6f -> 0x0000000063c62d70 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 4185 Comm: kworker/1:2 Tainted: G W 6.2.0-rc4-syzkaller-00009-gd532dd102151-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Workqueue: wg-crypt-wg0 wg_packet_tx_worker Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Reported-by: syzbot <syzkaller@googlegroups.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Cc: Arnd Bergmann <arnd@arndb.de> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-02-14xfrm/compat: prevent potential spectre v1 gadget in xfrm_xlate32_attr()Eric Dumazet1-0/+2
[ Upstream commit b6ee896385380aa621102e8ea402ba12db1cabff ] int type = nla_type(nla); if (type > XFRMA_MAX) { return -EOPNOTSUPP; } @type is then used as an array index and can be used as a Spectre v1 gadget. if (nla_len(nla) < compat_policy[type].len) { array_index_nospec() can be used to prevent leaking content of kernel memory to malicious users. Fixes: 5106f4a8acff ("xfrm/compat: Add 32=>64-bit messages translator") Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Dmitry Safonov <dima@arista.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Reviewed-by: Dmitry Safonov <dima@arista.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-02-14xfrm: compat: change expression for switch in xfrm_xlate64Anastasia Belova1-1/+1
[ Upstream commit eb6c59b735aa6cca77cdbb59cc69d69a0d63d986 ] Compare XFRM_MSG_NEWSPDINFO (value from netlink configuration messages enum) with nlh_src->nlmsg_type instead of nlh_src->nlmsg_type - XFRM_MSG_BASE. Found by Linux Verification Center (linuxtesting.org) with SVACE. Fixes: 4e9505064f58 ("net/xfrm/compat: Copy xfrm_spdattr_type_t atributes") Signed-off-by: Anastasia Belova <abelova@astralinux.ru> Acked-by: Dmitry Safonov <0x7f454c46@gmail.com> Tested-by: Dmitry Safonov <0x7f454c46@gmail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-02-09use less confusing names for iov_iter direction initializersAl Viro1-1/+1
[ Upstream commit de4eda9de2d957ef2d6a8365a01e26a435e958cb ] READ/WRITE proved to be actively confusing - the meanings are "data destination, as used with read(2)" and "data source, as used with write(2)", but people keep interpreting those as "we read data from it" and "we write data to it", i.e. exactly the wrong way. Call them ITER_DEST and ITER_SOURCE - at least that is harder to misinterpret... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Stable-dep-of: 6dd88fd59da8 ("vhost-scsi: unbreak any layout for response") Signed-off-by: Sasha Levin <sashal@kernel.org>
2022-11-24Merge branch 'master' of ↵Jakub Kicinski2-2/+15
git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec Steffen Klassert says: ==================== ipsec 2022-11-23 1) Fix "disable_policy" on ipv4 early demuxP Packets after the initial packet in a flow might be incorectly dropped on early demux if there are no matching policies. From Eyal Birger. 2) Fix a kernel warning in case XFRM encap type is not available. From Eyal Birger. 3) Fix ESN wrap around for GSO to avoid a double usage of a sequence number. From Christian Langrock. 4) Fix a send_acquire race with pfkey_register. From Herbert Xu. 5) Fix a list corruption panic in __xfrm_state_delete(). Thomas Jarosch. 6) Fix an unchecked return value in xfrm6_init(). Chen Zhongjin. * 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec: xfrm: Fix ignored return value in xfrm6_init() xfrm: Fix oops in __xfrm_state_delete() af_key: Fix send_acquire race with pfkey_register xfrm: replay: Fix ESN wrap around for GSO xfrm: lwtunnel: squelch kernel warning in case XFRM encap type is not available xfrm: fix "disable_policy" on ipv4 early demux ==================== Link: https://lore.kernel.org/r/20221123093117.434274-1-steffen.klassert@secunet.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-10-19xfrm: replay: Fix ESN wrap around for GSOChristian Langrock2-2/+15
When using GSO it can happen that the wrong seq_hi is used for the last packets before the wrap around. This can lead to double usage of a sequence number. To avoid this, we should serialize this last GSO packet. Fixes: d7dbefc45cf5 ("xfrm: Add xfrm_replay_overflow functions for offloading") Co-developed-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Christian Langrock <christian.langrock@secunet.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-10-12treewide: use prandom_u32_max() when possible, part 1Jason A. Donenfeld1-1/+1
Rather than incurring a division or requesting too many random bytes for the given range, use the prandom_u32_max() function, which only takes the minimum required bytes from the RNG and avoids divisions. This was done mechanically with this coccinelle script: @basic@ expression E; type T; identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32"; typedef u64; @@ ( - ((T)get_random_u32() % (E)) + prandom_u32_max(E) | - ((T)get_random_u32() & ((E) - 1)) + prandom_u32_max(E * XXX_MAKE_SURE_E_IS_POW2) | - ((u64)(E) * get_random_u32() >> 32) + prandom_u32_max(E) | - ((T)get_random_u32() & ~PAGE_MASK) + prandom_u32_max(PAGE_SIZE) ) @multi_line@ identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32"; identifier RAND; expression E; @@ - RAND = get_random_u32(); ... when != RAND - RAND %= (E); + RAND = prandom_u32_max(E); // Find a potential literal @literal_mask@ expression LITERAL; type T; identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32"; position p; @@ ((T)get_random_u32()@p & (LITERAL)) // Add one to the literal. @script:python add_one@ literal << literal_mask.LITERAL; RESULT; @@ value = None if literal.startswith('0x'): value = int(literal, 16) elif literal[0] in '123456789': value = int(literal, 10) if value is None: print("I don't know how to handle %s" % (literal)) cocci.include_match(False) elif value == 2**32 - 1 or value == 2**31 - 1 or value == 2**24 - 1 or value == 2**16 - 1 or value == 2**8 - 1: print("Skipping 0x%x for cleanup elsewhere" % (value)) cocci.include_match(False) elif value & (value + 1) != 0: print("Skipping 0x%x because it's not a power of two minus one" % (value)) cocci.include_match(False) elif literal.startswith('0x'): coccinelle.RESULT = cocci.make_expr("0x%x" % (value + 1)) else: coccinelle.RESULT = cocci.make_expr("%d" % (value + 1)) // Replace the literal mask with the calculated result. @plus_one@ expression literal_mask.LITERAL; position literal_mask.p; expression add_one.RESULT; identifier FUNC; @@ - (FUNC()@p & (LITERAL)) + prandom_u32_max(RESULT) @collapse_ret@ type T; identifier VAR; expression E; @@ { - T VAR; - VAR = (E); - return VAR; + return E; } @drop_var@ type T; identifier VAR; @@ { - T VAR; ... when != VAR } Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Reviewed-by: Kees Cook <keescook@chromium.org> Reviewed-by: Yury Norov <yury.norov@gmail.com> Reviewed-by: KP Singh <kpsingh@kernel.org> Reviewed-by: Jan Kara <jack@suse.cz> # for ext4 and sbitmap Reviewed-by: Christoph Böhmwalder <christoph.boehmwalder@linbit.com> # for drbd Acked-by: Jakub Kicinski <kuba@kernel.org> Acked-by: Heiko Carstens <hca@linux.ibm.com> # for s390 Acked-by: Ulf Hansson <ulf.hansson@linaro.org> # for mmc Acked-by: Darrick J. Wong <djwong@kernel.org> # for xfs Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
2022-10-04Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski2-5/+14
Merge in the left-over fixes before the net-next pull-request. Conflicts: drivers/net/ethernet/mediatek/mtk_ppe.c ae3ed15da588 ("net: ethernet: mtk_eth_soc: fix state in __mtk_foe_entry_clear") 9d8cb4c096ab ("net: ethernet: mtk_eth_soc: add foe_entry_size to mtk_eth_soc") https://lore.kernel.org/all/6cb6893b-4921-a068-4c30-1109795110bb@tessares.net/ kernel/bpf/helpers.c 8addbfc7b308 ("bpf: Gate dynptr API behind CAP_BPF") 5679ff2f138f ("bpf: Move bpf_loop and bpf_for_each_map_elem under CAP_BPF") 8a67f2de9b1d ("bpf: expose bpf_strtol and bpf_strtoul to all program types") https://lore.kernel.org/all/20221003201957.13149-1-daniel@iogearbox.net/ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-10-03Merge branch 'master' of ↵David S. Miller8-175/+503
git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next Steffen Klassert says: ==================== 1) Refactor selftests to use an array of structs in xfrm_fill_key(). From Gautam Menghani. 2) Drop an unused argument from xfrm_policy_match. From Hongbin Wang. 3) Support collect metadata mode for xfrm interfaces. From Eyal Birger. 4) Add netlink extack support to xfrm. From Sabrina Dubroca. Please note, there is a merge conflict in: include/net/dst_metadata.h between commit: 0a28bfd4971f ("net/macsec: Add MACsec skb_metadata_dst Tx Data path support") from the net-next tree and commit: 5182a5d48c3d ("net: allow storing xfrm interface metadata in metadata_dst") from the ipsec-next tree. Can be solved as done in linux-next. Please pull or let me know if there are problems. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2022-09-30net-next: skbuff: refactor pskb_pullRichard Gobert1-1/+1
pskb_may_pull already contains all of the checks performed by pskb_pull. Use pskb_may_pull for validation in pskb_pull, eliminating the duplication and making __pskb_pull obsolete. Replace __pskb_pull with pskb_pull where applicable. Signed-off-by: Richard Gobert <richardbgobert@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-09-29xfrm: ipcomp: add extack to ipcomp{4,6}_init_stateSabrina Dubroca1-3/+7
And the shared helper ipcomp_init_state. Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-29xfrm: pass extack down to xfrm_type ->init_stateSabrina Dubroca1-1/+1
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-28xfrm: Reinject transport-mode packets through workqueueLiu Jian1-5/+13
The following warning is displayed when the tcp6-multi-diffip11 stress test case of the LTP test suite is tested: watchdog: BUG: soft lockup - CPU#0 stuck for 22s! [ns-tcpserver:48198] CPU: 0 PID: 48198 Comm: ns-tcpserver Kdump: loaded Not tainted 6.0.0-rc6+ #39 Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : des3_ede_encrypt+0x27c/0x460 [libdes] lr : 0x3f sp : ffff80000ceaa1b0 x29: ffff80000ceaa1b0 x28: ffff0000df056100 x27: ffff0000e51e5280 x26: ffff80004df75030 x25: ffff0000e51e4600 x24: 000000000000003b x23: 0000000000802080 x22: 000000000000003d x21: 0000000000000038 x20: 0000000080000020 x19: 000000000000000a x18: 0000000000000033 x17: ffff0000e51e4780 x16: ffff80004e2d1448 x15: ffff80004e2d1248 x14: ffff0000e51e4680 x13: ffff80004e2d1348 x12: ffff80004e2d1548 x11: ffff80004e2d1848 x10: ffff80004e2d1648 x9 : ffff80004e2d1748 x8 : ffff80004e2d1948 x7 : 000000000bcaf83d x6 : 000000000000001b x5 : ffff80004e2d1048 x4 : 00000000761bf3bf x3 : 000000007f1dd0a3 x2 : ffff0000e51e4780 x1 : ffff0000e3b9a2f8 x0 : 00000000db44e872 Call trace: des3_ede_encrypt+0x27c/0x460 [libdes] crypto_des3_ede_encrypt+0x1c/0x30 [des_generic] crypto_cbc_encrypt+0x148/0x190 crypto_skcipher_encrypt+0x2c/0x40 crypto_authenc_encrypt+0xc8/0xfc [authenc] crypto_aead_encrypt+0x2c/0x40 echainiv_encrypt+0x144/0x1a0 [echainiv] crypto_aead_encrypt+0x2c/0x40 esp6_output_tail+0x1c8/0x5d0 [esp6] esp6_output+0x120/0x278 [esp6] xfrm_output_one+0x458/0x4ec xfrm_output_resume+0x6c/0x1f0 xfrm_output+0xac/0x4ac __xfrm6_output+0x130/0x270 xfrm6_output+0x60/0xec ip6_xmit+0x2ec/0x5bc inet6_csk_xmit+0xbc/0x10c __tcp_transmit_skb+0x460/0x8c0 tcp_write_xmit+0x348/0x890 __tcp_push_pending_frames+0x44/0x110 tcp_rcv_established+0x3c8/0x720 tcp_v6_do_rcv+0xdc/0x4a0 tcp_v6_rcv+0xc24/0xcb0 ip6_protocol_deliver_rcu+0xf0/0x574 ip6_input_finish+0x48/0x7c ip6_input+0x48/0xc0 ip6_rcv_finish+0x80/0x9c xfrm_trans_reinject+0xb0/0xf4 tasklet_action_common.constprop.0+0xf8/0x134 tasklet_action+0x30/0x3c __do_softirq+0x128/0x368 do_softirq+0xb4/0xc0 __local_bh_enable_ip+0xb0/0xb4 put_cpu_fpsimd_context+0x40/0x70 kernel_neon_end+0x20/0x40 sha1_base_do_update.constprop.0.isra.0+0x11c/0x140 [sha1_ce] sha1_ce_finup+0x94/0x110 [sha1_ce] crypto_shash_finup+0x34/0xc0 hmac_finup+0x48/0xe0 crypto_shash_finup+0x34/0xc0 shash_digest_unaligned+0x74/0x90 crypto_shash_digest+0x4c/0x9c shash_ahash_digest+0xc8/0xf0 shash_async_digest+0x28/0x34 crypto_ahash_digest+0x48/0xcc crypto_authenc_genicv+0x88/0xcc [authenc] crypto_authenc_encrypt+0xd8/0xfc [authenc] crypto_aead_encrypt+0x2c/0x40 echainiv_encrypt+0x144/0x1a0 [echainiv] crypto_aead_encrypt+0x2c/0x40 esp6_output_tail+0x1c8/0x5d0 [esp6] esp6_output+0x120/0x278 [esp6] xfrm_output_one+0x458/0x4ec xfrm_output_resume+0x6c/0x1f0 xfrm_output+0xac/0x4ac __xfrm6_output+0x130/0x270 xfrm6_output+0x60/0xec ip6_xmit+0x2ec/0x5bc inet6_csk_xmit+0xbc/0x10c __tcp_transmit_skb+0x460/0x8c0 tcp_write_xmit+0x348/0x890 __tcp_push_pending_frames+0x44/0x110 tcp_push+0xb4/0x14c tcp_sendmsg_locked+0x71c/0xb64 tcp_sendmsg+0x40/0x6c inet6_sendmsg+0x4c/0x80 sock_sendmsg+0x5c/0x6c __sys_sendto+0x128/0x15c __arm64_sys_sendto+0x30/0x40 invoke_syscall+0x50/0x120 el0_svc_common.constprop.0+0x170/0x194 do_el0_svc+0x38/0x4c el0_svc+0x28/0xe0 el0t_64_sync_handler+0xbc/0x13c el0t_64_sync+0x180/0x184 Get softirq info by bcc tool: ./softirqs -NT 10 Tracing soft irq event time... Hit Ctrl-C to end. 15:34:34 SOFTIRQ TOTAL_nsecs block 158990 timer 20030920 sched 46577080 net_rx 676746820 tasklet 9906067650 15:34:45 SOFTIRQ TOTAL_nsecs block 86100 sched 38849790 net_rx 676532470 timer 1163848790 tasklet 9409019620 15:34:55 SOFTIRQ TOTAL_nsecs sched 58078450 net_rx 475156720 timer 533832410 tasklet 9431333300 The tasklet software interrupt takes too much time. Therefore, the xfrm_trans_reinject executor is changed from tasklet to workqueue. Add add spin lock to protect the queue. This reduces the processing flow of the tcp_sendmsg function in this scenario. Fixes: acf568ee859f0 ("xfrm: Reinject transport-mode packets through tasklet") Signed-off-by: Liu Jian <liujian56@huawei.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-22xfrm: add extack support to xfrm_init_replaySabrina Dubroca3-5/+9
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-22xfrm: add extack to __xfrm_init_stateSabrina Dubroca2-8/+20
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-22xfrm: add extack to attach_*Sabrina Dubroca1-16/+30
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-22xfrm: add extack support to xfrm_dev_state_addSabrina Dubroca2-8/+20
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-22xfrm: add extack to verify_one_alg, verify_auth_trunc, verify_aeadSabrina Dubroca1-11/+20
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-22xfrm: add extack to verify_replaySabrina Dubroca1-8/+22
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-22xfrm: add extack support to verify_newsa_infoSabrina Dubroca1-21/+69
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-09-01xfrm: Update ipcomp_scratches with NULL when freedKhalid Masum1-0/+1
Currently if ipcomp_alloc_scratches() fails to allocate memory ipcomp_scratches holds obsolete address. So when we try to free the percpu scratches using ipcomp_free_scratches() it tries to vfree non existent vm area. Described below: static void * __percpu *ipcomp_alloc_scratches(void) { ... scratches = alloc_percpu(void *); if (!scratches) return NULL; ipcomp_scratches does not know about this allocation failure. Therefore holding the old obsolete address. ... } So when we free, static void ipcomp_free_scratches(void) { ... scratches = ipcomp_scratches; Assigning obsolete address from ipcomp_scratches if (!scratches) return; for_each_possible_cpu(i) vfree(*per_cpu_ptr(scratches, i)); Trying to free non existent page, causing warning: trying to vfree existent vm area. ... } Fix this breakage by updating ipcomp_scrtches with NULL when scratches is freed Suggested-by: Herbert Xu <herbert@gondor.apana.org.au> Reported-by: syzbot+5ec9bb042ddfe9644773@syzkaller.appspotmail.com Tested-by: syzbot+5ec9bb042ddfe9644773@syzkaller.appspotmail.com Signed-off-by: Khalid Masum <khalid.masum.92@gmail.com> Acked-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-31xfrm: add extack to verify_sec_ctx_lenSabrina Dubroca1-7/+9
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-31xfrm: add extack to validate_tmplSabrina Dubroca1-9/+20
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-31xfrm: add extack to verify_policy_typeSabrina Dubroca1-11/+17
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-31xfrm: add extack to verify_policy_dirSabrina Dubroca1-4/+5
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-31xfrm: add extack support to verify_newpolicy_infoSabrina Dubroca1-7/+18
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-31xfrm: propagate extack to all netlink doit handlersSabrina Dubroca1-22/+34
xfrm_user_rcv_msg() already handles extack, we just need to pass it down. Signed-off-by: Sabrina Dubroca <sd@queasysnail.net> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-29xfrm: lwtunnel: add lwtunnel support for xfrm interfaces in collect_md modeEyal Birger1-0/+85
Allow specifying the xfrm interface if_id and link as part of a route metadata using the lwtunnel infrastructure. This allows for example using a single xfrm interface in collect_md mode as the target of multiple routes each specifying a different if_id. With the appropriate changes to iproute2, considering an xfrm device ipsec1 in collect_md mode one can for example add a route specifying an if_id like so: ip route add <SUBNET> dev ipsec1 encap xfrm if_id 1 In which case traffic routed to the device via this route would use if_id in the xfrm interface policy lookup. Or in the context of vrf, one can also specify the "link" property: ip route add <SUBNET> dev ipsec1 encap xfrm if_id 1 link_dev eth15 Note: LWT_XFRM_LINK uses NLA_U32 similar to IFLA_XFRM_LINK even though internally "link" is signed. This is consistent with other _LINK attributes in other devices as well as in bpf and should not have an effect as device indexes can't be negative. Reviewed-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org> Signed-off-by: Eyal Birger <eyal.birger@gmail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-29xfrm: interface: support collect metadata modeEyal Birger3-27/+111
This commit adds support for 'collect_md' mode on xfrm interfaces. Each net can have one collect_md device, created by providing the IFLA_XFRM_COLLECT_METADATA flag at creation. This device cannot be altered and has no if_id or link device attributes. On transmit to this device, the if_id is fetched from the attached dst metadata on the skb. If exists, the link property is also fetched from the metadata. The dst metadata type used is METADATA_XFRM which holds these properties. On the receive side, xfrmi_rcv_cb() populates a dst metadata for each packet received and attaches it to the skb. The if_id used in this case is fetched from the xfrm state, and the link is fetched from the incoming device. This information can later be used by upper layers such as tc, ebpf, and ip rules. Because the skb is scrubed in xfrmi_rcv_cb(), the attachment of the dst metadata is postponed until after scrubing. Similarly, xfrm_input() is adapted to avoid dropping metadata dsts by only dropping 'valid' (skb_valid_dst(skb) == true) dsts. Policy matching on packets arriving from collect_md xfrmi devices is done by using the xfrm state existing in the skb's sec_path. The xfrm_if_cb.decode_cb() interface implemented by xfrmi_decode_session() is changed to keep the details of the if_id extraction tucked away in xfrm_interface.c. Reviewed-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org> Signed-off-by: Eyal Birger <eyal.birger@gmail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-24net: Fix data-races around netdev_max_backlog.Kuniyuki Iwashima2-2/+2
While reading netdev_max_backlog, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. While at it, we remove the unnecessary spaces in the doc. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-08-24Merge branch 'master' of ↵David S. Miller4-3/+3
git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec Steffen Klassert says: ==================== pull request (net): ipsec 2022-08-24 1) Fix a refcount leak in __xfrm_policy_check. From Xin Xiong. 2) Revert "xfrm: update SA curlft.use_time". This violates RFC 2367. From Antony Antony. 3) Fix a comment on XFRMA_LASTUSED. From Antony Antony. 4) x->lastused is not cloned in xfrm_do_migrate. Fix from Antony Antony. 5) Serialize the calls to xfrm_probe_algs. From Herbert Xu. 6) Fix a null pointer dereference of dst->dev on a metadata dst in xfrm_lookup_with_ifid. From Nikolay Aleksandrov. Please pull or let me know if there are problems. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2022-08-23xfrm: Drop unused argumentHongbin Wang1-8/+7
Drop unused argument from xfrm_policy_match, __xfrm_policy_eval_candidates and xfrm_policy_eval_candidates. No functional changes intended. Signed-off-by: Hongbin Wang <wh_bin@126.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-17xfrm: policy: fix metadata dst->dev xmit null pointer dereferenceNikolay Aleksandrov1-1/+1
When we try to transmit an skb with metadata_dst attached (i.e. dst->dev == NULL) through xfrm interface we can hit a null pointer dereference[1] in xfrmi_xmit2() -> xfrm_lookup_with_ifid() due to the check for a loopback skb device when there's no policy which dereferences dst->dev unconditionally. Not having dst->dev can be interepreted as it not being a loopback device, so just add a check for a null dst_orig->dev. With this fix xfrm interface's Tx error counters go up as usual. [1] net-next calltrace captured via netconsole: BUG: kernel NULL pointer dereference, address: 00000000000000c0 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP CPU: 1 PID: 7231 Comm: ping Kdump: loaded Not tainted 5.19.0+ #24 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.0-1.fc36 04/01/2014 RIP: 0010:xfrm_lookup_with_ifid+0x5eb/0xa60 Code: 8d 74 24 38 e8 26 a4 37 00 48 89 c1 e9 12 fc ff ff 49 63 ed 41 83 fd be 0f 85 be 01 00 00 41 be ff ff ff ff 45 31 ed 48 8b 03 <f6> 80 c0 00 00 00 08 75 0f 41 80 bc 24 19 0d 00 00 01 0f 84 1e 02 RSP: 0018:ffffb0db82c679f0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffffd0db7fcad430 RCX: ffffb0db82c67a10 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffb0db82c67a80 RBP: ffffb0db82c67a80 R08: ffffb0db82c67a14 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8fa449667dc8 R12: ffffffff966db880 R13: 0000000000000000 R14: 00000000ffffffff R15: 0000000000000000 FS: 00007ff35c83f000(0000) GS:ffff8fa478480000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000000000c0 CR3: 000000001ebb7000 CR4: 0000000000350ee0 Call Trace: <TASK> xfrmi_xmit+0xde/0x460 ? tcf_bpf_act+0x13d/0x2a0 dev_hard_start_xmit+0x72/0x1e0 __dev_queue_xmit+0x251/0xd30 ip_finish_output2+0x140/0x550 ip_push_pending_frames+0x56/0x80 raw_sendmsg+0x663/0x10a0 ? try_charge_memcg+0x3fd/0x7a0 ? __mod_memcg_lruvec_state+0x93/0x110 ? sock_sendmsg+0x30/0x40 sock_sendmsg+0x30/0x40 __sys_sendto+0xeb/0x130 ? handle_mm_fault+0xae/0x280 ? do_user_addr_fault+0x1e7/0x680 ? kvm_read_and_reset_apf_flags+0x3b/0x50 __x64_sys_sendto+0x20/0x30 do_syscall_64+0x34/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 RIP: 0033:0x7ff35cac1366 Code: eb 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b8 0f 1f 00 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 72 c3 90 55 48 83 ec 30 44 89 4c 24 2c 4c 89 RSP: 002b:00007fff738e4028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fff738e57b0 RCX: 00007ff35cac1366 RDX: 0000000000000040 RSI: 0000557164e4b450 RDI: 0000000000000003 RBP: 0000557164e4b450 R08: 00007fff738e7a2c R09: 0000000000000010 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000040 R13: 00007fff738e5770 R14: 00007fff738e4030 R15: 0000001d00000001 </TASK> Modules linked in: netconsole veth br_netfilter bridge bonding virtio_net [last unloaded: netconsole] CR2: 00000000000000c0 CC: Steffen Klassert <steffen.klassert@secunet.com> CC: Daniel Borkmann <daniel@iogearbox.net> Fixes: 2d151d39073a ("xfrm: Add possibility to set the default to block if we have no policy") Signed-off-by: Nikolay Aleksandrov <razor@blackwall.org> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-03xfrm: clone missing x->lastused in xfrm_do_migrateAntony Antony1-0/+1
x->lastused was not cloned in xfrm_do_migrate. Add it to clone during migrate. Fixes: 80c9abaabf42 ("[XFRM]: Extension for dynamic update of endpoint address(es)") Signed-off-by: Antony Antony <antony.antony@secunet.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-08-03Revert "xfrm: update SA curlft.use_time"Antony Antony2-2/+0
This reverts commit af734a26a1a95a9fda51f2abb0c22a7efcafd5ca. The abvoce commit is a regression according RFC 2367. A better fix would be use x->lastused. Which will be propsed later. according to RFC 2367 use_time == sadb_lifetime_usetime. "sadb_lifetime_usetime For CURRENT, the time, in seconds, when association was first used. For HARD and SOFT, the number of seconds after the first use of the association until it expires." Fixes: af734a26a1a9 ("xfrm: update SA curlft.use_time") Signed-off-by: Antony Antony <antony.antony@secunet.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-07-27xfrm: fix refcount leak in __xfrm_policy_check()Xin Xiong1-0/+1
The issue happens on an error path in __xfrm_policy_check(). When the fetching process of the object `pols[1]` fails, the function simply returns 0, forgetting to decrement the reference count of `pols[0]`, which is incremented earlier by either xfrm_sk_policy_lookup() or xfrm_policy_lookup(). This may result in memory leaks. Fix it by decreasing the reference count of `pols[0]` in that path. Fixes: 134b0fc544ba ("IPsec: propagate security module errors up from flow_cache_lookup") Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn> Signed-off-by: Xin Tan <tanxin.ctf@gmail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-07-25Merge branch 'master' of ↵David S. Miller2-8/+4
git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next Steffen Klassert says: ==================== pull request (net-next): ipsec-next 2022-07-20 1) Don't set DST_NOPOLICY in IPv4, a recent patch made this superfluous. From Eyal Birger. 2) Convert alg_key to flexible array member to avoid an iproute2 compile warning when built with gcc-12. From Stephen Hemminger. 3) xfrm_register_km and xfrm_unregister_km do always return 0 so change the type to void. From Zhengchao Shao. 4) Fix spelling mistake in esp6.c From Zhang Jiaming. 5) Improve the wording of comment above XFRM_OFFLOAD flags. From Petr Vaněk. Please pull or let me know if there are problems. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2022-07-21Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski2-2/+5
No conflicts. Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-07-20Merge branch 'master' of ↵David S. Miller1-1/+4
git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec Steffen Klassert says: ==================== pull request (net): ipsec 2022-07-20 1) Fix a policy refcount imbalance in xfrm_bundle_lookup. From Hangyu Hua. 2) Fix some clang -Wformat warnings. Justin Stitt ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
2022-07-15ip: Fix data-races around sysctl_ip_no_pmtu_disc.Kuniyuki Iwashima1-1/+1
While reading sysctl_ip_no_pmtu_disc, it can be changed concurrently. Thus, we need to add READ_ONCE() to its readers. Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2") Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com> Signed-off-by: David S. Miller <davem@davemloft.net>
2022-06-24xfrm: change the type of xfrm_register_km and xfrm_unregister_kmZhengchao Shao2-8/+4
Functions xfrm_register_km and xfrm_unregister_km do always return 0, change the type of functions to void. Signed-off-by: Zhengchao Shao <shaozhengchao@huawei.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-06-10net: rename reference+tracking helpersJakub Kicinski1-1/+1
Netdev reference helpers have a dev_ prefix for historic reasons. Renaming the old helpers would be too much churn but we can rename the tracking ones which are relatively recent and should be the default for new code. Rename: dev_hold_track() -> netdev_hold() dev_put_track() -> netdev_put() dev_replace_track() -> netdev_ref_replace() Link: https://lore.kernel.org/r/20220608043955.919359-1-kuba@kernel.org Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-06-02xfrm: xfrm_policy: fix a possible double xfrm_pols_put() in xfrm_bundle_lookup()Hangyu Hua1-1/+4
xfrm_policy_lookup() will call xfrm_pol_hold_rcu() to get a refcount of pols[0]. This refcount can be dropped in xfrm_expand_policies() when xfrm_expand_policies() return error. pols[0]'s refcount is balanced in here. But xfrm_bundle_lookup() will also call xfrm_pols_put() with num_pols == 1 to drop this refcount when xfrm_expand_policies() return error. This patch also fix an illegal address access. pols[0] will save a error point when xfrm_policy_lookup fails. This lead to xfrm_pols_put to resolve an illegal address in xfrm_bundle_lookup's error path. Fix these by setting num_pols = 0 in xfrm_expand_policies()'s error path. Fixes: 80c802f3073e ("xfrm: cache bundles instead of policies for outgoing flows") Signed-off-by: Hangyu Hua <hbh25y@gmail.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-06-02Merge branch 'master' of ↵Jakub Kicinski1-1/+2
git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec Steffen Klassert says: ==================== ipsec 2022-06-01 1) Revert "net: af_key: add check for pfkey_broadcast in function pfkey_process" From Michal Kubecek. 2) Don't set IPv4 DF bit when encapsulating IPv6 frames below 1280 bytes. From Maciej Żenczykowski. * 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec: xfrm: do not set IPv4 DF flag when encapsulating IPv6 frames <= 1280 bytes. Revert "net: af_key: add check for pfkey_broadcast in function pfkey_process" ==================== Link: https://lore.kernel.org/r/20220601103349.2297361-1-steffen.klassert@secunet.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2022-05-25xfrm: do not set IPv4 DF flag when encapsulating IPv6 frames <= 1280 bytes.Maciej Żenczykowski1-1/+2
One may want to have DF set on large packets to support discovering path mtu and limiting the size of generated packets (hence not setting the XFRM_STATE_NOPMTUDISC tunnel flag), while still supporting networks that are incapable of carrying even minimal sized IPv6 frames (post encapsulation). Having IPv4 Don't Frag bit set on encapsulated IPv6 frames that are not larger than the minimum IPv6 mtu of 1280 isn't useful, because the resulting ICMP Fragmentation Required error isn't actionable (even assuming you receive it) because IPv6 will not drop it's path mtu below 1280 anyway. While the IPv4 stack could prefrag the packets post encap, this requires the ICMP error to be successfully delivered and causes a loss of the original IPv6 frame (thus requiring a retransmit and latency hit). Luckily with IPv4 if we simply don't set the DF flag, we'll just make further fragmenting the packets some other router's problems. We'll still learn the correct IPv4 path mtu through encapsulation of larger IPv6 frames. I'm still not convinced this patch is entirely sufficient to make everything happy... but I don't see how it could possibly make things worse. See also recent: 4ff2980b6bd2 'xfrm: fix tunnel model fragmentation behavior' and friends Cc: Lorenzo Colitti <lorenzo@google.com> Cc: Eric Dumazet <edumazet@google.com> Cc: Lina Wang <lina.wang@mediatek.com> Cc: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Maciej Zenczykowski <maze@google.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
2022-05-19Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/netJakub Kicinski1-1/+1
drivers/net/ethernet/mellanox/mlx5/core/main.c b33886971dbc ("net/mlx5: Initialize flow steering during driver probe") 40379a0084c2 ("net/mlx5_fpga: Drop INNOVA TLS support") f2b41b32cde8 ("net/mlx5: Remove ipsec_ops function table") https://lore.kernel.org/all/20220519040345.6yrjromcdistu7vh@sx1/ 16d42d313350 ("net/mlx5: Drain fw_reset when removing device") 8324a02c342a ("net/mlx5: Add exit route when waiting for FW") https://lore.kernel.org/all/20220519114119.060ce014@canb.auug.org.au/ tools/testing/selftests/net/mptcp/mptcp_join.sh e274f7154008 ("selftests: mptcp: add subflow limits test-cases") b6e074e171bc ("selftests: mptcp: add infinite map testcase") 5ac1d2d63451 ("selftests: mptcp: Add tests for userspace PM type") https://lore.kernel.org/all/20220516111918.366d747f@canb.auug.org.au/ net/mptcp/options.c ba2c89e0ea74 ("mptcp: fix checksum byte order") 1e39e5a32ad7 ("mptcp: infinite mapping sending") ea66758c1795 ("tcp: allow MPTCP to update the announced window") https://lore.kernel.org/all/20220519115146.751c3a37@canb.auug.org.au/ net/mptcp/pm.c 95d686517884 ("mptcp: fix subflow accounting on close") 4d25247d3ae4 ("mptcp: bypass in-kernel PM restrictions for non-kernel PMs") https://lore.kernel.org/all/20220516111435.72f35dca@canb.auug.org.au/ net/mptcp/subflow.c ae66fb2ba6c3 ("mptcp: Do TCP fallback on early DSS checksum failure") 0348c690ed37 ("mptcp: add the fallback check") f8d4bcacff3b ("mptcp: infinite mapping receiving") https://lore.kernel.org/all/20220519115837.380bb8d4@canb.auug.org.au/ Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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