inet: implement lockless IP_TTL

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ip_select_ttl() is racy, because it reads inet->uc_ttl
without proper locking.

Add READ_ONCE()/WRITE_ONCE() annotations while
allowing IP_TTL socket option to be set/read without
holding the socket lock.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

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Eric Dumazet 2023-08-16 08:15:46 +00:00 • committed by David S. Miller

parent 08e39c0dfa

commit 10f42426e5

2 changed files with 13 additions and 16 deletions

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2

net/ipv4/ip_output.c

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27

net/ipv4/ip_sockglue.c

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