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Grepping for "sizeof\(.+\) / sizeof\(" found this as one of the first
candidates.
Maybe a coccinelle can catch all of those.
Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
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The conflict was an interaction between a bug fix in the
netvsc driver in 'net' and an optimization of the RX path
in 'net-next'.
Signed-off-by: David S. Miller <davem@davemloft.net>
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In the latest version of the IPv6 Segment Routing IETF draft [1] the
cleanup flag is removed and the flags field length is shrunk from 16 bits
to 8 bits. As a consequence, the input of the HMAC computation is modified
in a non-backward compatible way by covering the whole octet of flags
instead of only the cleanup bit. As such, if an implementation compatible
with the latest draft computes the HMAC of an SRH who has other flags set
to 1, then the HMAC result would differ from the current implementation.
This patch carries those modifications to prevent conflict with other
implementations of IPv6 SR.
[1] https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-05
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Since we allocate per cpu storage, let's also use NUMA hints.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
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When CONFIG_PREEMPT=y, CONFIG_IPV6=m and CONFIG_SEG6_HMAC=y,
seg6_hmac_init() is called during the initialization of the ipv6 module.
This causes a subsequent call to smp_processor_id() with preemption
enabled, resulting in the following trace.
[ 20.451460] BUG: using smp_processor_id() in preemptible [00000000] code: systemd/1
[ 20.452556] caller is debug_smp_processor_id+0x17/0x19
[ 20.453304] CPU: 0 PID: 1 Comm: systemd Not tainted 4.9.0-rc5-00973-g46738b1 #1
[ 20.454406] ffffc9000062fc18 ffffffff813607b2 0000000000000000 ffffffff81a7f782
[ 20.455528] ffffc9000062fc48 ffffffff813778dc 0000000000000000 00000000001dcf98
[ 20.456539] ffffffffa003bd08 ffffffff81af93e0 ffffc9000062fc58 ffffffff81377905
[ 20.456539] Call Trace:
[ 20.456539] [<ffffffff813607b2>] dump_stack+0x63/0x7f
[ 20.456539] [<ffffffff813778dc>] check_preemption_disabled+0xd1/0xe3
[ 20.456539] [<ffffffff81377905>] debug_smp_processor_id+0x17/0x19
[ 20.460260] [<ffffffffa0061f3b>] seg6_hmac_init+0xfa/0x192 [ipv6]
[ 20.460260] [<ffffffffa0061ccc>] seg6_init+0x39/0x6f [ipv6]
[ 20.460260] [<ffffffffa006121a>] inet6_init+0x21a/0x321 [ipv6]
[ 20.460260] [<ffffffffa0061000>] ? 0xffffffffa0061000
[ 20.460260] [<ffffffff81000457>] do_one_initcall+0x8b/0x115
[ 20.460260] [<ffffffff811328a3>] do_init_module+0x53/0x1c4
[ 20.460260] [<ffffffff8110650a>] load_module+0x1153/0x14ec
[ 20.460260] [<ffffffff81106a7b>] SYSC_finit_module+0x8c/0xb9
[ 20.460260] [<ffffffff81106a7b>] ? SYSC_finit_module+0x8c/0xb9
[ 20.460260] [<ffffffff81106abc>] SyS_finit_module+0x9/0xb
[ 20.460260] [<ffffffff810014d1>] do_syscall_64+0x62/0x75
[ 20.460260] [<ffffffff816834f0>] entry_SYSCALL64_slow_path+0x25/0x25
Moreover, dst_cache_* functions also call smp_processor_id(), generating
a similar trace.
This patch uses raw_cpu_ptr() in seg6_hmac_init() rather than this_cpu_ptr()
and disable preemption when using dst_cache_* functions.
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Current allocations are not NUMA aware, and lack proper
cleanup in case of error.
It is perfectly fine to use static per cpu allocations for 256 bytes
per cpu.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: David Lebrun <david.lebrun@uclouvain.be>
Acked-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
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This patch adds the necessary functions to compute and check the HMAC signature
of an SR-enabled packet. Two HMAC algorithms are supported: hmac(sha1) and
hmac(sha256).
In order to avoid dynamic memory allocation for each HMAC computation,
a per-cpu ring buffer is allocated for this purpose.
A new per-interface sysctl called seg6_require_hmac is added, allowing a
user-defined policy for processing HMAC-signed SR-enabled packets.
A value of -1 means that the HMAC field will always be ignored.
A value of 0 means that if an HMAC field is present, its validity will
be enforced (the packet is dropped is the signature is incorrect).
Finally, a value of 1 means that any SR-enabled packet that does not
contain an HMAC signature or whose signature is incorrect will be dropped.
Signed-off-by: David Lebrun <david.lebrun@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
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