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sctp: Add RCU protection to assoc->transport_addr_list

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peer.transport_addr_list is currently only protected by sk_sock
which is inpractical to acquire for procfs dumping purposes.

This patch adds RCU protection allowing for the procfs readers to
enter RCU read-side critical sections.

Modification of the list continues to be serialized via sk_lock.

V2: Use list_del_rcu() in sctp_association_free() to be safe
    Skip transports marked dead when dumping for procfs

Cc: Vlad Yasevich <vyasevich@gmail.com>
Cc: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Thomas Graf <tgraf@suug.ch>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Thomas Graf
2012-12-06 09:25:05 +00:00
committed by David S. Miller
parent 0b0fe913bf
commit 45122ca26c
4 changed files with 30 additions and 10 deletions
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2
include/net/sctp/structs.h
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@@ -949,6 +949,8 @@ struct sctp_transport {
/* 64-bit random number sent with heartbeat. */
__u64 hb_nonce;
struct rcu_head rcu;
};
struct sctp_transport *sctp_transport_new(struct net *, const union sctp_addr *,