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34515e94c9
This is a new feature defined in section 5 of rfc7829: "Primary Path
Switchover". By introducing a new tunable parameter:
Primary.Switchover.Max.Retrans (PSMR)
The primary path will be changed to another active path when the path
error counter on the old primary path exceeds PSMR, so that "the SCTP
sender is allowed to continue data transmission on a new working path
even when the old primary destination address becomes active again".
This patch is to add this tunable parameter, 'ps_retrans' per netns,
sock, asoc and transport. It also allows a user to change ps_retrans
per netns by sysctl, and ps_retrans per sock/asoc/transport will be
initialized with it.
The check will be done in sctp_do_8_2_transport_strike() when this
feature is enabled.
Note this feature is disabled by initializing 'ps_retrans' per netns
as 0xffff by default, and its value can't be less than 'pf_retrans'
when changing by sysctl.
v3->v4:
- add define SCTP_PS_RETRANS_MAX 0xffff, and use it on extra2 of
sysctl 'ps_retrans'.
- add a new entry for ps_retrans on ip-sysctl.txt.
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
167 lines
4.3 KiB
C
167 lines
4.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#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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/* Primary.Switchover.Max.Retrans sysctl value
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* taken from:
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* https://tools.ietf.org/html/rfc7829
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*/
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int ps_retrans;
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/*
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* Disable Potentially-Failed feature, the feature is enabled by default
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* pf_enable - 0 : disable pf
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* - >0 : enable pf
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*/
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int pf_enable;
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/*
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* Disable Potentially-Failed state exposure, ignored by default
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* pf_expose - 0 : compatible with old applications (by default)
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* - 1 : disable pf state exposure
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* - 2 : enable pf state exposure
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*/
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int pf_expose;
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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 indicate if PR-CONFIG is enabled. */
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int reconf_enable;
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/* Flag to indicate if SCTP-AUTH is enabled */
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int auth_enable;
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/* Flag to indicate if stream interleave is enabled */
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int intl_enable;
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/* Flag to indicate if ecn is enabled */
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int ecn_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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