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2d45a02d01
->auto_asconf_splist is per namespace and mangled by functions like
sctp_setsockopt_auto_asconf() which doesn't guarantee any serialization.
Also, the call to inet_sk_copy_descendant() was backuping
->auto_asconf_list through the copy but was not honoring
->do_auto_asconf, which could lead to list corruption if it was
different between both sockets.
This commit thus fixes the list handling by using ->addr_wq_lock
spinlock to protect the list. A special handling is done upon socket
creation and destruction for that. Error handlig on sctp_init_sock()
will never return an error after having initialized asconf, so
sctp_destroy_sock() can be called without addrq_wq_lock. The lock now
will be take on sctp_close_sock(), before locking the socket, so we
don't do it in inverse order compared to sctp_addr_wq_timeout_handler().
Instead of taking the lock on sctp_sock_migrate() for copying and
restoring the list values, it's preferred to avoid rewritting it by
implementing sctp_copy_descendant().
Issue was found with a test application that kept flipping sysctl
default_auto_asconf on and off, but one could trigger it by issuing
simultaneous setsockopt() calls on multiple sockets or by
creating/destroying sockets fast enough. This is only triggerable
locally.
Fixes: 9f7d653b67 ("sctp: Add Auto-ASCONF support (core).")
Reported-by: Ji Jianwen <jiji@redhat.com>
Suggested-by: Neil Horman <nhorman@tuxdriver.com>
Suggested-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
136 lines
3.6 KiB
C
136 lines
3.6 KiB
C
#ifndef __NETNS_SCTP_H__
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#define __NETNS_SCTP_H__
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struct sock;
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struct proc_dir_entry;
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struct sctp_mib;
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struct ctl_table_header;
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struct netns_sctp {
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DEFINE_SNMP_STAT(struct sctp_mib, sctp_statistics);
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#ifdef CONFIG_PROC_FS
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struct proc_dir_entry *proc_net_sctp;
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#endif
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#ifdef CONFIG_SYSCTL
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struct ctl_table_header *sysctl_header;
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#endif
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/* This is the global socket data structure used for responding to
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* the Out-of-the-blue (OOTB) packets. A control sock will be created
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* for this socket at the initialization time.
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*/
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struct sock *ctl_sock;
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/* This is the global local address list.
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* We actively maintain this complete list of addresses on
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* the system by catching address add/delete events.
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*
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* It is a list of sctp_sockaddr_entry.
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*/
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struct list_head local_addr_list;
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struct list_head addr_waitq;
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struct timer_list addr_wq_timer;
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struct list_head auto_asconf_splist;
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/* Lock that protects both addr_waitq and auto_asconf_splist */
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spinlock_t addr_wq_lock;
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/* Lock that protects the local_addr_list writers */
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spinlock_t local_addr_lock;
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/* RFC2960 Section 14. Suggested SCTP Protocol Parameter Values
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*
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* The following protocol parameters are RECOMMENDED:
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*
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* RTO.Initial - 3 seconds
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* RTO.Min - 1 second
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* RTO.Max - 60 seconds
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* RTO.Alpha - 1/8 (3 when converted to right shifts.)
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* RTO.Beta - 1/4 (2 when converted to right shifts.)
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*/
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unsigned int rto_initial;
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unsigned int rto_min;
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unsigned int rto_max;
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/* Note: rto_alpha and rto_beta are really defined as inverse
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* powers of two to facilitate integer operations.
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*/
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int rto_alpha;
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int rto_beta;
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/* Max.Burst - 4 */
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int max_burst;
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/* Whether Cookie Preservative is enabled(1) or not(0) */
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int cookie_preserve_enable;
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/* The namespace default hmac alg */
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char *sctp_hmac_alg;
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/* Valid.Cookie.Life - 60 seconds */
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unsigned int valid_cookie_life;
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/* Delayed SACK timeout 200ms default*/
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unsigned int sack_timeout;
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/* HB.interval - 30 seconds */
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unsigned int hb_interval;
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/* Association.Max.Retrans - 10 attempts
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* Path.Max.Retrans - 5 attempts (per destination address)
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* Max.Init.Retransmits - 8 attempts
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*/
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int max_retrans_association;
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int max_retrans_path;
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int max_retrans_init;
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/* Potentially-Failed.Max.Retrans sysctl value
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* taken from:
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* http://tools.ietf.org/html/draft-nishida-tsvwg-sctp-failover-05
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*/
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int pf_retrans;
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/*
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* Policy for preforming sctp/socket accounting
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* 0 - do socket level accounting, all assocs share sk_sndbuf
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* 1 - do sctp accounting, each asoc may use sk_sndbuf bytes
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*/
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int sndbuf_policy;
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/*
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* Policy for preforming sctp/socket accounting
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* 0 - do socket level accounting, all assocs share sk_rcvbuf
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* 1 - do sctp accounting, each asoc may use sk_rcvbuf bytes
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*/
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int rcvbuf_policy;
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int default_auto_asconf;
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/* Flag to indicate if addip is enabled. */
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int addip_enable;
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int addip_noauth;
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/* Flag to indicate if PR-SCTP is enabled. */
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int prsctp_enable;
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/* Flag to idicate if SCTP-AUTH is enabled */
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int auth_enable;
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/*
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* Policy to control SCTP IPv4 address scoping
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* 0 - Disable IPv4 address scoping
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* 1 - Enable IPv4 address scoping
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* 2 - Selectively allow only IPv4 private addresses
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* 3 - Selectively allow only IPv4 link local address
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*/
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int scope_policy;
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/* Threshold for rwnd update SACKS. Receive buffer shifted this many
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* bits is an indicator of when to send and window update SACK.
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*/
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int rwnd_upd_shift;
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/* Threshold for autoclose timeout, in seconds. */
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unsigned long max_autoclose;
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};
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#endif /* __NETNS_SCTP_H__ */
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