Neil Horman 4244854d22 sctp: be more restrictive in transport selection on bundled sacks ... It was noticed recently that when we send data on a transport, its possible that we might bundle a sack that arrived on a different transport. While this isn't a major problem, it does go against the SHOULD requirement in section 6.4 of RFC 2960: An endpoint SHOULD transmit reply chunks (e.g., SACK, HEARTBEAT ACK, etc.) to the same destination transport address from which it received the DATA or control chunk to which it is replying. This rule should also be followed if the endpoint is bundling DATA chunks together with the reply chunk. This patch seeks to correct that. It restricts the bundling of sack operations to only those transports which have moved the ctsn of the association forward since the last sack. By doing this we guarantee that we only bundle outbound saks on a transport that has received a chunk since the last sack. This brings us into stricter compliance with the RFC. Vlad had initially suggested that we strictly allow only sack bundling on the transport that last moved the ctsn forward. While this makes sense, I was concerned that doing so prevented us from bundling in the case where we had received chunks that moved the ctsn on multiple transports. In those cases, the RFC allows us to select any of the transports having received chunks to bundle the sack on. so I've modified the approach to allow for that, by adding a state variable to each transport that tracks weather it has moved the ctsn since the last sack. This I think keeps our behavior (and performance), close enough to our current profile that I think we can do this without a sysctl knob to enable/disable it. Signed-off-by: Neil Horman <nhorman@tuxdriver.com> CC: Vlad Yaseivch <vyasevich@gmail.com> CC: David S. Miller <davem@davemloft.net> CC: linux-sctp@vger.kernel.org Reported-by: Michele Baldessari <michele@redhat.com> Reported-by: sorin serban <sserban@redhat.com> Acked-by: Vlad Yasevich <vyasevich@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2012-06-30 22:44:35 -07:00
..
9p	9p: Reduce object size with CONFIG_NET_9P_DEBUG	2012-01-05 10:51:44 -06:00
bluetooth	Bluetooth: Add support for encryption key refresh	2012-06-08 21:00:40 -03:00
caif	caif-hsi: robust frame aggregation for HSI	2012-04-13 11:37:36 -04:00
irda	Fix common misspellings	2011-03-31 11:26:23 -03:00
iucv	af_iucv: add shutdown for HS transport	2012-03-07 22:52:24 -08:00
netfilter	netfilter: nf_conntrack: use this_cpu_inc()	2012-05-08 19:36:33 +02:00
netns	netfilter: nf_ct_helper: allow to disable automatic helper assignment	2012-05-08 19:35:18 +02:00
nfc	NFC: HCI drivers don't have to keep track of polling state	2012-05-15 17:31:22 -04:00
phonet	net: remove my future former mail address	2012-06-17 16:29:38 -07:00
sctp	sctp: be more restrictive in transport selection on bundled sacks	2012-06-30 22:44:35 -07:00
tc_act
act_api.h	net: sched: constify tcf_proto and tc_action	2011-07-06 02:52:16 -07:00
addrconf.h	ipv6: bool/const conversions phase2	2012-05-19 01:08:16 -04:00
af_ieee802154.h
af_rxrpc.h	net: Remove __KERNEL__ cpp checks from include/net	2011-04-24 10:54:56 -07:00
af_unix.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
ah.h
arp.h	ipv4: Eliminate spurious argument to __ipv4_neigh_lookup	2012-02-15 17:48:35 -05:00
atmclip.h	atm: clip: Use device neigh support on top of "arp_tbl".	2011-11-30 18:51:03 -05:00
ax25.h	net ax25: Fix the build when sysctl support is disabled.	2012-04-23 22:14:47 -04:00
ax88796.h
cfg80211-wext.h	cfg80211: remove unused wext handler exports	2011-08-08 14:26:29 -04:00
cfg80211.h	cfg80211: fix cfg80211_can_beacon_sec_chan prototype	2012-05-16 13:08:15 -04:00
checksum.h
cipso_ipv4.h	cipso: handle CIPSO options correctly when NetLabel is disabled	2012-06-01 14:18:29 -04:00
cls_cgroup.h
codel.h	fq_codel: should use qdisc backlog as threshold	2012-05-16 15:30:26 -04:00
compat.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
datalink.h
dcbevent.h	dcb: Add stub routines for !CONFIG_DCB	2011-10-06 15:49:51 -04:00
dcbnl.h	net/dcb: Add an optional max rate attribute	2012-04-05 05:08:04 -04:00
dn_dev.h
dn_fib.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
dn_neigh.h
dn_nsp.h
dn_route.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
dn.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
dsa.h	dsa: Include linux/if_ether.h to fix build error	2011-12-01 11:41:06 -05:00
dsfield.h
dst_ops.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
dst.h	ipv6: fix incorrect ipsec fragment	2012-05-27 01:11:22 -04:00
esp.h
ethoc.h
fib_rules.h
flow_keys.h	flow_dissector: use a 64bit load/store	2011-11-29 13:17:03 -05:00
flow.h	ipv4: reset flowi parameters on route connect	2012-02-04 19:29:48 -05:00
garp.h	garp: remove last synchronize_rcu() call	2011-05-12 17:46:56 -04:00
gen_stats.h	Fix common misspellings	2011-03-31 11:26:23 -03:00
genetlink.h	net: Deinline __nlmsg_put and genlmsg_put. -7k code on i386 defconfig.	2012-01-30 15:22:06 -05:00
gre.h
icmp.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
ieee80211_radiotap.h	wireless: move ieee80211chan2mhz macro	2011-11-11 12:32:50 -05:00
ieee802154_netdev.h	mac802154: declare reduced mlme operations	2012-05-16 15:16:56 -04:00
ieee802154.h	6LoWPAN: add fragmentation support	2011-11-14 00:19:42 -05:00
if_inet6.h	net: delete all instances of special processing for token ring	2012-05-15 20:14:35 -04:00
inet6_connection_sock.h	tcp: bind() use stronger condition for bind_conflict	2012-04-14 15:28:55 -04:00
inet6_hashtables.h	net: use IS_ENABLED(CONFIG_IPV6)	2011-12-11 18:25:16 -05:00
inet_common.h
inet_connection_sock.h	ipv6: RTAX_FEATURE_ALLFRAG causes inefficient TCP segment sizing	2012-04-27 00:03:34 -04:00
inet_ecn.h	inet: add rfc 3168 extract in front of INET_ECN_encapsulate()	2011-10-22 01:25:23 -04:00
inet_frag.h	ip_frag: struct inet_frags match() method returns a bool	2012-05-18 01:40:27 -04:00
inet_hashtables.h	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
inet_sock.h	net: implement IP_RECVTOS for IP_PKTOPTIONS	2012-02-13 00:46:41 -05:00
inet_timewait_sock.h	inet: remove rcu protection on tw_net	2011-12-14 13:34:55 -05:00
inetpeer.h	inetpeer: fix a race in inetpeer_gc_worker()	2012-06-06 10:45:15 -07:00
ip6_checksum.h
ip6_fib.h	Revert "ipv6: Prevent access to uninitialized fib_table_hash via /proc/net/ipv6_route"	2012-06-16 01:12:19 -07:00
ip6_route.h	ipv6: bool/const conversions phase2	2012-05-19 01:08:16 -04:00
ip6_tunnel.h
ip_fib.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
ip_vs.h	ipvs: add support for sync threads	2012-05-08 19:40:33 +02:00
ip.h	net: delete all instances of special processing for token ring	2012-05-15 20:14:35 -04:00
ipcomp.h
ipconfig.h
ipip.h	tunnel: implement 64 bits statistics	2012-04-14 14:47:05 -04:00
ipv6.h	ipv6: bool/const conversions phase2	2012-05-19 01:08:16 -04:00
ipx.h	net: Remove __KERNEL__ cpp checks from include/net	2011-04-24 10:54:56 -07:00
iw_handler.h	Fix common misspellings	2011-03-31 11:26:23 -03:00
lapb.h	lapb: Neaten debugging	2012-05-17 18:45:20 -04:00
lib80211.h	include: replace linux/module.h with "struct module" wherever possible	2011-10-31 19:32:32 -04:00
llc_c_ac.h
llc_c_ev.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
llc_c_st.h
llc_conn.h
llc_if.h
llc_pdu.h	net: delete all instances of special processing for token ring	2012-05-15 20:14:35 -04:00
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
llc.h	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
mac80211.h	mac80211: add some missing kernel-doc	2012-06-09 10:31:09 +02:00
mac802154.h	mac802154: RX data path	2012-05-16 15:16:44 -04:00
mip6.h
mld.h
ndisc.h	Treat ND option 31 as userland (DNSSL support)	2012-04-12 15:56:57 -04:00
neighbour.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
net_namespace.h	net sysctl: Add place holder functions for when sysctl support is compiled out of the kernel.	2012-04-23 19:24:28 -04:00
net_ratelimit.h	net: Kill ratelimit.h dependency in linux/net.h	2011-05-27 13:41:33 -04:00
netdma.h
netevent.h	net: Remove __KERNEL__ cpp checks from include/net	2011-04-24 10:54:56 -07:00
netlabel.h	doc: Update the email address for Paul Moore in various source files	2011-08-01 17:58:33 -07:00
netlink.h	netlink: Delete all NLA_PUT*() macros.	2012-04-02 04:33:45 -04:00
netprio_cgroup.h	netprio_cgroup: fix wrong memory access when NETPRIO_CGROUP=m	2012-02-10 15:08:57 -05:00
netrom.h
nexthop.h
nl802154.h
p8022.h
ping.h	net: ping: fix build failure	2011-05-17 14:16:58 -04:00
pkt_cls.h
pkt_sched.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
protocol.h	net: use IS_ENABLED(CONFIG_IPV6)	2011-12-11 18:25:16 -05:00
psnap.h
raw.h
rawv6.h	ipv6: bool/const conversions phase2	2012-05-19 01:08:16 -04:00
red.h	net_sched: red: Make minor corrections to comments	2012-04-16 23:53:11 -04:00
regulatory.h	cfg80211: pass DFS region to drivers through reg_notifier()	2011-11-21 16:20:41 -05:00
request_sock.h	tcp: Change possible SYN flooding messages	2011-09-15 14:49:43 -04:00
rose.h	rose: Add length checks to CALL_REQUEST parsing	2011-03-27 17:59:04 -07:00
route.h	net: Reorder initialization in ip_route_output to fix gcc warning	2012-06-11 00:04:47 -07:00
rtnetlink.h	rtnetlink: ops->get_tx_queue() cannot take a const 'tb'.	2012-04-13 14:21:04 -04:00
sch_generic.h	bonding: Fix corrupted queue_mapping	2012-06-12 15:29:21 -07:00
scm.h	af_unix: dont send SCM_CREDENTIALS by default	2011-09-28 13:29:50 -04:00
secure_seq.h	tcp: add const qualifiers where possible	2011-10-21 05:22:42 -04:00
slhc_vj.h
snmp.h	Merge branch 'for-3.3' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu	2012-01-09 13:08:28 -08:00
sock.h	memcg: decrement static keys at real destroy time	2012-05-29 16:22:28 -07:00
stp.h
tcp_memcontrol.h	cgroup: pass struct mem_cgroup instead of struct cgroup to socket memcg	2012-04-10 10:04:07 -07:00
tcp_states.h
tcp.h	tcp: bool conversions	2012-05-17 14:59:59 -04:00
timewait_sock.h	BUG: headers with BUG/BUG_ON etc. need linux/bug.h	2012-03-04 17:54:34 -05:00
transp_v6.h	net: relax PKTINFO non local ipv6 udp xmit check	2011-08-30 17:39:01 -04:00
udp.h	net/ipv6/udp: UDP encapsulation: introduce encap_rcv hook into IPv6	2012-04-28 22:21:51 -04:00
udplite.h	net: ipv4: Standardize prefixes for message logging	2012-03-12 17:05:21 -07:00
wext.h
wimax.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
wpan-phy.h	mac802154: monitor device support	2012-05-16 15:17:08 -04:00
x25.h	net: cleanup unsigned to unsigned int	2012-04-15 12:44:40 -04:00
x25device.h
xfrm.h	xfrm: Convert several xfrm policy match functions to bool.	2012-05-15 15:04:57 -04:00