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* net: Remove unnecessary inclusions of asm/semaphore.hMatthew Wilcox2008-04-18
| | | | | | | | | None of these files use any of the functionality promised by asm/semaphore.h. It's possible that they rely on it dragging in some unrelated header file, but I can't build all these files, so we'll have fix any build failures as they come up. Signed-off-by: Matthew Wilcox <willy@linux.intel.com>
* [INET]: Drop the inet_inherit_port() call.Pavel Emelyanov2008-04-18
| | | | | | | | | | | | | | | As I can see from the code, two places (tcp_v6_syn_recv_sock and dccp_v6_request_recv_sock) that call this one already run with BHs disabled, so it's safe to call __inet_inherit_port there. Besides (in case I missed smth with code review) the calltrace tcp_v6_syn_recv_sock `- tcp_v4_syn_recv_sock `- __inet_inherit_port and the similar for DCCP are valid, but assumes BHs to be disabled. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Fix comment about control sockets.Pavel Emelyanov2008-04-14
| | | | | | | | | | These sockets now have a bit other names and are no longer global. Shame on me, I haven't provided a good comment for this when sending DCCP netnsization patches. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* Merge branch 'master' of ↵David S. Miller2008-04-14
|\ | | | | | | | | | | | | | | | | | | | | | | | | master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 Conflicts: drivers/net/ehea/ehea_main.c drivers/net/wireless/iwlwifi/Kconfig drivers/net/wireless/rt2x00/rt61pci.c net/ipv4/inet_timewait_sock.c net/ipv6/raw.c net/mac80211/ieee80211_sta.c
| * [DCCP]: Fix skb->cb conflicts with IPPatrick McHardy2008-04-12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | dev_queue_xmit() and the other IP output functions expect to get a skb with clear or properly initialized skb->cb. Unlike TCP and UDP, the dccp_skb_cb doesn't contain a struct inet_skb_parm at the beginning, so the DCCP-specific data is interpreted by the IP output functions. This can cause false negatives for the conditional POST_ROUTING hook invocation, making the packet bypass the hook. Add a inet_skb_parm/inet6_skb_parm union to the beginning of dccp_skb_cb to avoid clashes. Also add a BUILD_BUG_ON to make sure it fits in the cb. [ Combined with patch from Gerrit Renker to remove two now unnecessary memsets of IPCB(skb)->opt ] Signed-off-by: Patrick McHardy <kaber@trash.net> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV6]: Make per-net socket lookup.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | | | | | | | The inet6_lookup family of functions requires a net to lookup a socket in, so give a proper one to them. No more things to do for dccpv6, since routing is OK and the ipv4-like transport layer filtering is not done for ipv6. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV6]: Actually create ctl socket on each net and use it.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | | | | | Move the call to inet_ctl_sock_create to init callback (and inet_ctl_sock_destroy to exit one) and use proper ctl sock in dccp_v6_ctl_send_reset. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV6]: Move the dccp_v6_ctl_sk on the struct net.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | And replace all its usage with init_net's socket. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV6]: Add dummy per-net operations.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | | | They will be responsible for ctl socket initialization, but currently they are void. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV6]: Don't pass NULL to ip6_dst_lookup.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | This call uses the sock to get the net to lookup the routing in. With CONFIG_NET_NS this code will OOPS, since the sk ptr is NULL. After looking inside the ip6_dst_lookup and drawing the analogy with respective ipv6 code, it seems, that the dccp ctl socket is a good candidate for the first argument. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV4]: Enable DCCPv4 in net namespaces.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | | | This enables sockets creation with IPPROTO_DCCP and enables the ip level to pass DCCP packets to the DCCP level. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV4]: Make per-net socket lookup.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | | | The inet_lookup family of functions requires a net to lookup a socket in, so give a proper one to them. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV4]: Use proper net to route the reset packet.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | | | The dccp_v4_route_skb used in dccp_v4_ctl_send_reset, currently works with init_net's routing tables - fix it. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV4]: Actually create ctl socket on each net and use it.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | | | | | Move the call to inet_ctl_sock_create to init callback (and inet_ctl_sock_destroy to exit one) and use proper ctl sock in dccp_v4_ctl_send_reset. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV4]: Move the dccp_v4_ctl_sk on the struct net.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | And replace all its usage with init_net's socket. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS][DCCPV4]: Add dummy per-net operations.Pavel Emelyanov2008-04-14
| | | | | | | | | | | | | | | | | | They will be responsible for ctl socket initialization, but currently they are void. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [DCCP]: Use snmp_mib_{init,free}().YOSHIFUJI Hideaki2008-04-10
| | | | | | | | | | | | Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [NETNS]: Inet control socket should not hold a namespace.Denis V. Lunev2008-04-03
| | | | | | | | | | | | | | | | | | | | This is a generic requirement, so make inet_ctl_sock_create namespace aware and create a inet_ctl_sock_destroy wrapper around sk_release_kernel. Signed-off-by: Denis V. Lunev <den@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [INET]: Let inet_ctl_sock_create return sock rather than socket.Denis V. Lunev2008-04-03
| | | | | | | | | | | | | | | | All upper protocol layers are already use sock internally. Signed-off-by: Denis V. Lunev <den@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [INET]: Rename inet_csk_ctl_sock_create to inet_ctl_sock_create.Denis V. Lunev2008-04-03
| | | | | | | | | | | | | | | | | | | | | | This call is nothing common with INET connection sockets code. It simply creates an unhashes kernel sockets for protocol messages. Move the new call into af_inet.c after the rename. Signed-off-by: Denis V. Lunev <den@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [DCCP]: dccp_v(4|6)_ctl_socket is leaked.Denis V. Lunev2008-04-03
| | | | | | | | | | | | | | | | | | This seems a purism as module can't be unloaded, but though if cleanup method is present it should be correct and clean all staff created. Signed-off-by: Denis V. Lunev <den@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [DCCP]: Replace socket with sock for reset sending.Denis V. Lunev2008-04-03
| | | | | | | | | | | | | | | | Replace dccp_v(4|6)_ctl_socket with sock to unify a code with TCP/ICMP. Signed-off-by: Denis V. Lunev <den@openvz.org> Acked-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [SOCK]: Drop inuse pcounter from struct proto (v2).Pavel Emelyanov2008-03-28
| | | | | | | | | | | | | | | | An uppercut - do not use the pcounter on struct proto. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Acked-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [SOCK]: Add udp_hash member to struct proto.Pavel Emelyanov2008-03-22
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Inspired by the commit ab1e0a13 ([SOCK] proto: Add hashinfo member to struct proto) from Arnaldo, I made similar thing for UDP/-Lite IPv4 and -v6 protocols. The result is not that exciting, but it removes some levels of indirection in udpxxx_get_port and saves some space in code and text. The first step is to union existing hashinfo and new udp_hash on the struct proto and give a name to this union, since future initialization of tcpxxx_prot, dccp_vx_protinfo and udpxxx_protinfo will cause gcc warning about inability to initialize anonymous member this way. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* | net: replace remaining __FUNCTION__ occurrencesHarvey Harrison2008-03-05
| | | | | | | | | | | | | | __FUNCTION__ is gcc-specific, use __func__ Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [IPV4]: Add 'rtable' field in struct sk_buff to alias 'dst' and avoid castsEric Dumazet2008-03-05
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (Anonymous) unions can help us to avoid ugly casts. A common cast it the (struct rtable *)skb->dst one. Defining an union like : union { struct dst_entry *dst; struct rtable *rtable; }; permits to use skb->rtable in place. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* | [INET]: Remove struct dst_entry *dst from request_sock_ops.rtx_syn_ack.Denis V. Lunev2008-02-29
|/ | | | | | | | | | It looks like dst parameter is used in this API due to historical reasons. Actually, it is really used in the direct call to tcp_v4_send_synack only. So, create a wrapper for tcp_v4_send_synack and remove dst from rtx_syn_ack. Signed-off-by: Denis V. Lunev <den@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [SOCK] proto: Add hashinfo member to struct protoArnaldo Carvalho de Melo2008-02-03
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | This way we can remove TCP and DCCP specific versions of sk->sk_prot->get_port: both v4 and v6 use inet_csk_get_port sk->sk_prot->hash: inet_hash is directly used, only v6 need a specific version to deal with mapped sockets sk->sk_prot->unhash: both v4 and v6 use inet_hash directly struct inet_connection_sock_af_ops also gets a new member, bind_conflict, so that inet_csk_get_port can find the per family routine. Now only the lookup routines receive as a parameter a struct inet_hashtable. With this we further reuse code, reducing the difference among INET transport protocols. Eventually work has to be done on UDP and SCTP to make them share this infrastructure and get as a bonus inet_diag interfaces so that iproute can be used with these protocols. net-2.6/net/ipv4/inet_hashtables.c: struct proto | +8 struct inet_connection_sock_af_ops | +8 2 structs changed __inet_hash_nolisten | +18 __inet_hash | -210 inet_put_port | +8 inet_bind_bucket_create | +1 __inet_hash_connect | -8 5 functions changed, 27 bytes added, 218 bytes removed, diff: -191 net-2.6/net/core/sock.c: proto_seq_show | +3 1 function changed, 3 bytes added, diff: +3 net-2.6/net/ipv4/inet_connection_sock.c: inet_csk_get_port | +15 1 function changed, 15 bytes added, diff: +15 net-2.6/net/ipv4/tcp.c: tcp_set_state | -7 1 function changed, 7 bytes removed, diff: -7 net-2.6/net/ipv4/tcp_ipv4.c: tcp_v4_get_port | -31 tcp_v4_hash | -48 tcp_v4_destroy_sock | -7 tcp_v4_syn_recv_sock | -2 tcp_unhash | -179 5 functions changed, 267 bytes removed, diff: -267 net-2.6/net/ipv6/inet6_hashtables.c: __inet6_hash | +8 1 function changed, 8 bytes added, diff: +8 net-2.6/net/ipv4/inet_hashtables.c: inet_unhash | +190 inet_hash | +242 2 functions changed, 432 bytes added, diff: +432 vmlinux: 16 functions changed, 485 bytes added, 492 bytes removed, diff: -7 /home/acme/git/net-2.6/net/ipv6/tcp_ipv6.c: tcp_v6_get_port | -31 tcp_v6_hash | -7 tcp_v6_syn_recv_sock | -9 3 functions changed, 47 bytes removed, diff: -47 /home/acme/git/net-2.6/net/dccp/proto.c: dccp_destroy_sock | -7 dccp_unhash | -179 dccp_hash | -49 dccp_set_state | -7 dccp_done | +1 5 functions changed, 1 bytes added, 242 bytes removed, diff: -241 /home/acme/git/net-2.6/net/dccp/ipv4.c: dccp_v4_get_port | -31 dccp_v4_request_recv_sock | -2 2 functions changed, 33 bytes removed, diff: -33 /home/acme/git/net-2.6/net/dccp/ipv6.c: dccp_v6_get_port | -31 dccp_v6_hash | -7 dccp_v6_request_recv_sock | +5 3 functions changed, 5 bytes added, 38 bytes removed, diff: -33 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NETNS]: Tcp-v6 sockets per-net lookup.Pavel Emelyanov2008-01-31
| | | | | | | | | Add a net argument to inet6_lookup and propagate it further. Actually, this is tcp-v6 implementation of what was done for tcp-v4 sockets in a previous patch. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NETNS]: Tcp-v4 sockets per-net lookup.Pavel Emelyanov2008-01-31
| | | | | | | | | | | Add a net argument to inet_lookup and propagate it further into lookup calls. Plus tune the __inet_check_established. The dccp and inet_diag, which use that lookup functions pass the init_net into them. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NETNS]: Add namespace parameter to ip_route_output_flow.Denis V. Lunev2008-01-28
| | | | | | | Needed to propagate it down to the __ip_route_output_key. Signed_off_by: Denis V. Lunev <den@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [NET]: Simple ctl_table to ctl_path conversions.Pavel Emelyanov2008-01-28
| | | | | | | | | | | This patch includes many places, that only required replacing the ctl_table-s with appropriate ctl_paths and call register_sysctl_paths(). Nothing special was done with them. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [CCID3]: Kill some bloatIlpo Järvinen2008-01-28
| | | | | | | | | | | | | | | | | | | | | | Without a number of CONFIG.*DEBUG: net/dccp/ccids/ccid3.c: ccid3_hc_tx_update_x | -170 ccid3_hc_tx_packet_sent | -175 ccid3_hc_tx_packet_recv | -169 ccid3_hc_tx_no_feedback_timer | -192 ccid3_hc_tx_send_packet | -144 5 functions changed, 850 bytes removed, diff: -850 net/dccp/ccids/ccid3.c: ccid3_update_send_interval | +191 1 function changed, 191 bytes added, diff: +191 net/dccp/ccids/ccid3.o: 6 functions changed, 191 bytes added, 850 bytes removed, diff: -659 Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@helsinki.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
* [INET]: Uninline the __inet_hash function.Pavel Emelyanov2008-01-28
| | | | | | | | | | | | | | | | | | | | | | | This one is used in quite many places in the networking code and seems to big to be inline. After the patch net/ipv4/build-in.o loses ~650 bytes: add/remove: 2/0 grow/shrink: 0/5 up/down: 461/-1114 (-653) function old new delta __inet_hash_nolisten - 282 +282 __inet_hash - 179 +179 tcp_sacktag_write_queue 2255 2254 -1 __inet_lookup_listener 284 274 -10 tcp_v4_syn_recv_sock 755 493 -262 tcp_v4_hash 389 35 -354 inet_hash_connect 1086 599 -487 This version addresses the issue pointed by Eric, that while being inline this function was optimized by gcc in respect to the 'listen_possible' argument. Signed-off-by: Pavel Emelyanov <xemul@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Remove unused inline functionGerrit Renker2008-01-28
| | | | | | | | | | The function follows48(), which is a special-case of dccp_delta_seqno(), is nowhere used in the DCCP code, thus removed by this patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [CCID3]: Nofeedback timer according to rfc3448bisGerrit Renker2008-01-28
| | | | | | | | | | | | | | | | This implements the changes to the nofeedback timer handling suggested in draft rfc3448bis00, section 4.4. In particular, these changes mean: * better handling of the lossless case (p == 0) * the timestamp for computing t_ld becomes obsolete * much more recent document (RFC 3448 is almost 5 years old) * concepts in rfc3448bis arose from a real, working implementation (cf. sec. 12) Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [CCID3]: Implement rfc3448bis changes to feedback receptionGerrit Renker2008-01-28
| | | | | | | | | | This implements the algorithm to update the allowed sending rate X upon receiving feedback packets, as described in draft rfc3448bis, 4.2/4.3. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [CCID3]: Remove two irrelevant states in TX feedback handlingGerrit Renker2008-01-28
| | | | | | | | | | | * the NO_SENT state is only triggered in bidirectional mode, costing unnecessary processing. * the TERM (terminating) state is irrelevant. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [CCID3]: Use a function to update p_inv, and p is never usedGerrit Renker2008-01-28
| | | | | | | | | | | | This patch 1) concentrates previously scattered computation of p_inv into one function; 2) removes the `p' element of the CCID3 RX sock (it is redundant); 3) makes the tfrc_rx_info structure standalone, only used on demand. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Introducing CCMPSGerrit Renker2008-01-28
| | | | | | | | | | | | | | | | | | | | | | This introduces a CCMPS field for setting a CCID-specific upper bound on the application payload size, as is defined in RFC 4340, section 14. Only the TX CCID is considered in setting this limit, since the RX CCID generates comparatively small (DCCP-Ack) feedback packets. The CCMPS field includes network and transport layer header lengths. The only current CCMPS customer is CCID4 (via RFC 4828). A wrapper is used to allow querying the CCMPS even at times where the CCID modules may not have been fully negotiated yet. In dccp_sync_mss() the variable `mss_now' has been renamed into `cur_mps', to reflect that we are dealing with an MPS, but not an MSS. Since the DCCP code closely follows the TCP code, the identifiers `dccp_sync_mss' and `dccps_mss_cache' have been kept, as they have direct TCP counterparts. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [CCID]: More informative registrationGerrit Renker2008-01-28
| | | | | | | | | | | | | | | | | | | | | The patch makes the registration messages of CCID 2/3 a bit more informative: instead of repeating the CCID number as currently done, "CCID: Registered CCID 2 (ccid2)" or "CCID: Registered CCID 3 (ccid3)", the descriptive names of the CCID's (from RFCs) are now used: "CCID: Registered CCID 2 (TCP-like)" and "CCID: Registered CCID 3 (TCP-Friendly Rate Control)". To allow spaces in the name, the slab name string has been changed to refer to the numeric CCID identifier, using the same format as before. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Documentation for CCID operationsGerrit Renker2008-01-28
| | | | | | | | | This adds documentation for the ccid_operations structure. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Ignore feature negotiation on Data packetsGerrit Renker2008-01-28
| | | | | | | | | | | | | | This implements [RFC 4340, p. 32]: "any feature negotiation options received on DCCP-Data packets MUST be ignored". Also added a FIXME for further processing, since the code currently (wrongly) classifies empty Confirm options as invalid - this needs to be resolved in a separate patch. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Make code assumptions explicitGerrit Renker2008-01-28
| | | | | | | | | | | This removes several `XXX' references which indicate a missing support for non-1-byte feature values: this is unnecessary, as all currently known (standardised) SP feature values are 1-byte quantities. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Remove unused and redundant validation functionsGerrit Renker2008-01-28
| | | | | | | | | | | | | | | | | | | | | This removes two inlines which were both called in a single function only: 1) dccp_feat_change() is always called with either DCCPO_CHANGE_L or DCCPO_CHANGE_R as argument * from dccp_set_socktopt_change() via do_dccp_setsockopt() with DCCP_SOCKOPT_CHANGE_R/L * from __dccp_feat_init() via dccp_feat_init() also with DCCP_SOCKOPT_CHANGE_R/L. Hence the dccp_feat_is_valid_type() is completely unnecessary and always returns true. 2) Due to (1), the length test reduces to 'len >= 4', which in turn makes dccp_feat_is_valid_length() unnecessary. Furthermore, the inline function dccp_feat_is_reserved() was unfolded, since only called in a single place. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Support inserting options during the 3-way handshakeGerrit Renker2008-01-28
| | | | | | | | | | | | | | | | | This provides a separate routine to insert options during the initial handshake. The main purpose is to conduct feature negotiation, for the moment the only user is the timestamp echo needed for the (CCID3) handshake RTT sample. Padding of options has been put into a small separate routine, to be shared among the two functions. This could also be used as a generic routine to finish inserting options. Also removed an `XXX' comment since its content was obvious. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Handle timestamps on Request/Response exchange separatelyGerrit Renker2008-01-28
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | In DCCP, timestamps can occur on packets anytime, CCID3 uses a timestamp(/echo) on the Request/Response exchange. This patch addresses the following situation: * timestamps are recorded on the listening socket; * Responses are sent from dccp_request_sockets; * suppose two connections reach the listening socket with very small time in between: * the first timestamp value gets overwritten by the second connection request. This is not really good, so this patch separates timestamps into * those which are received by the server during the initial handshake (on dccp_request_sock); * those which are received by the client or the client after connection establishment. As before, a timestamp of 0 is regarded as indicating that no (meaningful) timestamp has been received (in addition, a warning message is printed if hosts send 0-valued timestamps). The timestamp-echoing now works as follows: * when a timestamp is present on the initial Request, it is placed into dreq, due to the call to dccp_parse_options in dccp_v{4,6}_conn_request; * when a timestamp is present on the Ack leading from RESPOND => OPEN, it is copied over from the request_sock into the child cocket in dccp_create_openreq_child; * timestamps received on an (established) dccp_sock are treated as before. Since Elapsed Time is measured in hundredths of milliseconds (13.2), the new dccp_timestamp() function is used, as it is expected that the time between receiving the timestamp and sending the timestamp echo will be very small against the wrap-around time. As a byproduct, this allows smaller timestamping-time fields. Furthermore, inserting the Timestamp Echo option has been taken out of the block starting with '!dccp_packet_without_ack()', since Timestamp Echo can be carried on any packet (5.8 and 13.3). Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Acked-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Add (missing) option parsing to request_sock processingGerrit Renker2008-01-28
| | | | | | | | | | | | | | | | | | | | | | | | | | This adds option-parsing code to processing of Acks in the listening state on request_socks on the server, serving two purposes (i) resolves a FIXME (removed); (ii) paves the way for feature-negotiation during connection-setup. There is an intended subtlety here with regard to dccp_check_req: Parsing options happens only after testing whether the received packet is a retransmitted Request. Otherwise, if the Request contained (a possibly large number of) feature-negotiation options, recomputing state would have to happen each time a retransmitted Request arrives, which opens the door to an easy DoS attack. Since in a genuine retransmission the options should not be different from the original, reusing the already computed state seems better. The other point is - if there are timestamp options on the Request, they will not be answered; which means that in the presence of retransmission (likely due to loss and/or other problems), the use of Request/Response RTT sampling is suspended, so that startup problems here do not propagate. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Allow to parse options on Request SocketsGerrit Renker2008-01-28
| | | | | | | | | | | | | | | | The option parsing code currently only parses on full sk's. This causes a problem for options sent during the initial handshake (in particular timestamps and feature-negotiation options). Therefore, this patch extends the option parsing code with an additional argument for request_socks: if it is non-NULL, options are parsed on the request socket, otherwise the normal path (parsing on the sk) is used. Subsequent patches, which implement feature negotiation during connection setup, make use of this facility. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
* [DCCP]: Collapse repeated `len' statements into oneGerrit Renker2008-01-28
| | | | | | | | | | This replaces 4 individual assignments for `len' with a single one, placed where the control flow of those 4 leads to. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Ian McDonald <ian.mcdonald@jandi.co.nz> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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