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![Gao feng](/assets/img/avatar_default.png)
This patch adds netns support to nf_log and it prepares netns support for existing loggers. It is composed of four major changes. 1) nf_log_register has been split to two functions: nf_log_register and nf_log_set. The new nf_log_register is used to globally register the nf_logger and nf_log_set is used for enabling pernet support from nf_loggers. Per netns is not yet complete after this patch, it comes in separate follow up patches. 2) Add net as a parameter of nf_log_bind_pf. Per netns is not yet complete after this patch, it only allows to bind the nf_logger to the protocol family from init_net and it skips other cases. 3) Adapt all nf_log_packet callers to pass netns as parameter. After this patch, this function only works for init_net. 4) Make the sysctl net/netfilter/nf_log pernet. Signed-off-by: Gao feng <gaofeng@cn.fujitsu.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
1006 lines
29 KiB
C
1006 lines
29 KiB
C
/*
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* DCCP connection tracking protocol helper
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*
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* Copyright (c) 2005, 2006, 2008 Patrick McHardy <kaber@trash.net>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/sysctl.h>
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#include <linux/spinlock.h>
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#include <linux/skbuff.h>
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#include <linux/dccp.h>
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#include <linux/slab.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include <linux/netfilter/nfnetlink_conntrack.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_l4proto.h>
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#include <net/netfilter/nf_conntrack_ecache.h>
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#include <net/netfilter/nf_log.h>
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/* Timeouts are based on values from RFC4340:
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*
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* - REQUEST:
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*
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* 8.1.2. Client Request
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*
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* A client MAY give up on its DCCP-Requests after some time
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* (3 minutes, for example).
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*
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* - RESPOND:
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*
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* 8.1.3. Server Response
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*
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* It MAY also leave the RESPOND state for CLOSED after a timeout of
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* not less than 4MSL (8 minutes);
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*
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* - PARTOPEN:
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*
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* 8.1.5. Handshake Completion
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*
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* If the client remains in PARTOPEN for more than 4MSL (8 minutes),
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* it SHOULD reset the connection with Reset Code 2, "Aborted".
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*
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* - OPEN:
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*
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* The DCCP timestamp overflows after 11.9 hours. If the connection
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* stays idle this long the sequence number won't be recognized
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* as valid anymore.
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*
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* - CLOSEREQ/CLOSING:
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*
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* 8.3. Termination
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*
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* The retransmission timer should initially be set to go off in two
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* round-trip times and should back off to not less than once every
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* 64 seconds ...
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*
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* - TIMEWAIT:
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*
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* 4.3. States
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*
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* A server or client socket remains in this state for 2MSL (4 minutes)
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* after the connection has been town down, ...
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*/
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#define DCCP_MSL (2 * 60 * HZ)
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static const char * const dccp_state_names[] = {
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[CT_DCCP_NONE] = "NONE",
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[CT_DCCP_REQUEST] = "REQUEST",
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[CT_DCCP_RESPOND] = "RESPOND",
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[CT_DCCP_PARTOPEN] = "PARTOPEN",
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[CT_DCCP_OPEN] = "OPEN",
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[CT_DCCP_CLOSEREQ] = "CLOSEREQ",
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[CT_DCCP_CLOSING] = "CLOSING",
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[CT_DCCP_TIMEWAIT] = "TIMEWAIT",
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[CT_DCCP_IGNORE] = "IGNORE",
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[CT_DCCP_INVALID] = "INVALID",
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};
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#define sNO CT_DCCP_NONE
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#define sRQ CT_DCCP_REQUEST
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#define sRS CT_DCCP_RESPOND
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#define sPO CT_DCCP_PARTOPEN
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#define sOP CT_DCCP_OPEN
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#define sCR CT_DCCP_CLOSEREQ
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#define sCG CT_DCCP_CLOSING
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#define sTW CT_DCCP_TIMEWAIT
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#define sIG CT_DCCP_IGNORE
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#define sIV CT_DCCP_INVALID
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/*
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* DCCP state transition table
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*
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* The assumption is the same as for TCP tracking:
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*
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* We are the man in the middle. All the packets go through us but might
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* get lost in transit to the destination. It is assumed that the destination
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* can't receive segments we haven't seen.
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*
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* The following states exist:
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*
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* NONE: Initial state, expecting Request
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* REQUEST: Request seen, waiting for Response from server
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* RESPOND: Response from server seen, waiting for Ack from client
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* PARTOPEN: Ack after Response seen, waiting for packet other than Response,
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* Reset or Sync from server
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* OPEN: Packet other than Response, Reset or Sync seen
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* CLOSEREQ: CloseReq from server seen, expecting Close from client
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* CLOSING: Close seen, expecting Reset
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* TIMEWAIT: Reset seen
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* IGNORE: Not determinable whether packet is valid
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*
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* Some states exist only on one side of the connection: REQUEST, RESPOND,
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* PARTOPEN, CLOSEREQ. For the other side these states are equivalent to
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* the one it was in before.
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*
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* Packets are marked as ignored (sIG) if we don't know if they're valid
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* (for example a reincarnation of a connection we didn't notice is dead
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* already) and the server may send back a connection closing Reset or a
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* Response. They're also used for Sync/SyncAck packets, which we don't
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* care about.
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*/
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static const u_int8_t
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dccp_state_table[CT_DCCP_ROLE_MAX + 1][DCCP_PKT_SYNCACK + 1][CT_DCCP_MAX + 1] = {
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[CT_DCCP_ROLE_CLIENT] = {
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[DCCP_PKT_REQUEST] = {
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/*
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* sNO -> sRQ Regular Request
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* sRQ -> sRQ Retransmitted Request or reincarnation
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* sRS -> sRS Retransmitted Request (apparently Response
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* got lost after we saw it) or reincarnation
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* sPO -> sIG Ignore, conntrack might be out of sync
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* sOP -> sIG Ignore, conntrack might be out of sync
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* sCR -> sIG Ignore, conntrack might be out of sync
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* sCG -> sIG Ignore, conntrack might be out of sync
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* sTW -> sRQ Reincarnation
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*
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* sNO, sRQ, sRS, sPO. sOP, sCR, sCG, sTW, */
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sRQ, sRQ, sRS, sIG, sIG, sIG, sIG, sRQ,
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},
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[DCCP_PKT_RESPONSE] = {
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/*
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* sNO -> sIV Invalid
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* sRQ -> sIG Ignore, might be response to ignored Request
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* sRS -> sIG Ignore, might be response to ignored Request
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* sPO -> sIG Ignore, might be response to ignored Request
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* sOP -> sIG Ignore, might be response to ignored Request
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* sCR -> sIG Ignore, might be response to ignored Request
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* sCG -> sIG Ignore, might be response to ignored Request
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* sTW -> sIV Invalid, reincarnation in reverse direction
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* goes through sRQ
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIV,
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},
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[DCCP_PKT_ACK] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sIV No connection
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* sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.)
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* sPO -> sPO Retransmitted Ack for Response, remain in PARTOPEN
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* sOP -> sOP Regular ACK, remain in OPEN
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* sCR -> sCR Ack in CLOSEREQ MAY be processed (8.3.)
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* sCG -> sCG Ack in CLOSING MAY be processed (8.3.)
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* sTW -> sIV
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV
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},
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[DCCP_PKT_DATA] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sIV No connection
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* sRS -> sIV No connection
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* sPO -> sIV MUST use DataAck in PARTOPEN state (8.1.5.)
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* sOP -> sOP Regular Data packet
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* sCR -> sCR Data in CLOSEREQ MAY be processed (8.3.)
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* sCG -> sCG Data in CLOSING MAY be processed (8.3.)
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* sTW -> sIV
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sIV, sIV, sOP, sCR, sCG, sIV,
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},
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[DCCP_PKT_DATAACK] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sIV No connection
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* sRS -> sPO Ack for Response, move to PARTOPEN (8.1.5.)
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* sPO -> sPO Remain in PARTOPEN state
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* sOP -> sOP Regular DataAck packet in OPEN state
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* sCR -> sCR DataAck in CLOSEREQ MAY be processed (8.3.)
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* sCG -> sCG DataAck in CLOSING MAY be processed (8.3.)
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* sTW -> sIV
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sPO, sPO, sOP, sCR, sCG, sIV
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},
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[DCCP_PKT_CLOSEREQ] = {
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/*
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* CLOSEREQ may only be sent by the server.
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV
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},
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[DCCP_PKT_CLOSE] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sIV No connection
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* sRS -> sIV No connection
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* sPO -> sCG Client-initiated close
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* sOP -> sCG Client-initiated close
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* sCR -> sCG Close in response to CloseReq (8.3.)
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* sCG -> sCG Retransmit
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* sTW -> sIV Late retransmit, already in TIME_WAIT
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sIV, sCG, sCG, sCG, sIV, sIV
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},
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[DCCP_PKT_RESET] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sTW Sync received or timeout, SHOULD send Reset (8.1.1.)
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* sRS -> sTW Response received without Request
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* sPO -> sTW Timeout, SHOULD send Reset (8.1.5.)
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* sOP -> sTW Connection reset
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* sCR -> sTW Connection reset
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* sCG -> sTW Connection reset
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* sTW -> sIG Ignore (don't refresh timer)
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sTW, sTW, sTW, sTW, sTW, sTW, sIG
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},
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[DCCP_PKT_SYNC] = {
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/*
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* We currently ignore Sync packets
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
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},
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[DCCP_PKT_SYNCACK] = {
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/*
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* We currently ignore SyncAck packets
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
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},
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},
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[CT_DCCP_ROLE_SERVER] = {
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[DCCP_PKT_REQUEST] = {
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/*
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* sNO -> sIV Invalid
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* sRQ -> sIG Ignore, conntrack might be out of sync
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* sRS -> sIG Ignore, conntrack might be out of sync
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* sPO -> sIG Ignore, conntrack might be out of sync
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* sOP -> sIG Ignore, conntrack might be out of sync
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* sCR -> sIG Ignore, conntrack might be out of sync
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* sCG -> sIG Ignore, conntrack might be out of sync
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* sTW -> sRQ Reincarnation, must reverse roles
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIG, sIG, sIG, sIG, sIG, sIG, sRQ
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},
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[DCCP_PKT_RESPONSE] = {
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/*
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* sNO -> sIV Response without Request
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* sRQ -> sRS Response to clients Request
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* sRS -> sRS Retransmitted Response (8.1.3. SHOULD NOT)
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* sPO -> sIG Response to an ignored Request or late retransmit
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* sOP -> sIG Ignore, might be response to ignored Request
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* sCR -> sIG Ignore, might be response to ignored Request
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* sCG -> sIG Ignore, might be response to ignored Request
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* sTW -> sIV Invalid, Request from client in sTW moves to sRQ
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sRS, sRS, sIG, sIG, sIG, sIG, sIV
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},
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[DCCP_PKT_ACK] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sIV No connection
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* sRS -> sIV No connection
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* sPO -> sOP Enter OPEN state (8.1.5.)
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* sOP -> sOP Regular Ack in OPEN state
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* sCR -> sIV Waiting for Close from client
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* sCG -> sCG Ack in CLOSING MAY be processed (8.3.)
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* sTW -> sIV
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV
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},
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[DCCP_PKT_DATA] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sIV No connection
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* sRS -> sIV No connection
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* sPO -> sOP Enter OPEN state (8.1.5.)
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* sOP -> sOP Regular Data packet in OPEN state
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* sCR -> sIV Waiting for Close from client
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* sCG -> sCG Data in CLOSING MAY be processed (8.3.)
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* sTW -> sIV
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV
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},
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[DCCP_PKT_DATAACK] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sIV No connection
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* sRS -> sIV No connection
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* sPO -> sOP Enter OPEN state (8.1.5.)
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* sOP -> sOP Regular DataAck in OPEN state
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* sCR -> sIV Waiting for Close from client
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* sCG -> sCG Data in CLOSING MAY be processed (8.3.)
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* sTW -> sIV
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sIV, sOP, sOP, sIV, sCG, sIV
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},
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[DCCP_PKT_CLOSEREQ] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sIV No connection
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* sRS -> sIV No connection
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* sPO -> sOP -> sCR Move directly to CLOSEREQ (8.1.5.)
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* sOP -> sCR CloseReq in OPEN state
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* sCR -> sCR Retransmit
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* sCG -> sCR Simultaneous close, client sends another Close
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* sTW -> sIV Already closed
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sIV, sCR, sCR, sCR, sCR, sIV
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},
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[DCCP_PKT_CLOSE] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sIV No connection
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* sRS -> sIV No connection
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* sPO -> sOP -> sCG Move direcly to CLOSING
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* sOP -> sCG Move to CLOSING
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* sCR -> sIV Close after CloseReq is invalid
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* sCG -> sCG Retransmit
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* sTW -> sIV Already closed
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIV, sIV, sIV, sCG, sCG, sIV, sCG, sIV
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},
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[DCCP_PKT_RESET] = {
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/*
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* sNO -> sIV No connection
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* sRQ -> sTW Reset in response to Request
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* sRS -> sTW Timeout, SHOULD send Reset (8.1.3.)
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* sPO -> sTW Timeout, SHOULD send Reset (8.1.3.)
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* sOP -> sTW
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* sCR -> sTW
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* sCG -> sTW
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* sTW -> sIG Ignore (don't refresh timer)
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW, sTW */
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sIV, sTW, sTW, sTW, sTW, sTW, sTW, sTW, sIG
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},
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[DCCP_PKT_SYNC] = {
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/*
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* We currently ignore Sync packets
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
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},
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[DCCP_PKT_SYNCACK] = {
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/*
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* We currently ignore SyncAck packets
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*
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* sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */
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sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG,
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},
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},
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};
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/* this module per-net specifics */
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static int dccp_net_id __read_mostly;
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struct dccp_net {
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struct nf_proto_net pn;
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int dccp_loose;
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unsigned int dccp_timeout[CT_DCCP_MAX + 1];
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};
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static inline struct dccp_net *dccp_pernet(struct net *net)
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{
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return net_generic(net, dccp_net_id);
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}
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static bool dccp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
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struct nf_conntrack_tuple *tuple)
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{
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struct dccp_hdr _hdr, *dh;
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dh = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
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if (dh == NULL)
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return false;
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tuple->src.u.dccp.port = dh->dccph_sport;
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tuple->dst.u.dccp.port = dh->dccph_dport;
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return true;
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}
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static bool dccp_invert_tuple(struct nf_conntrack_tuple *inv,
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const struct nf_conntrack_tuple *tuple)
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{
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inv->src.u.dccp.port = tuple->dst.u.dccp.port;
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inv->dst.u.dccp.port = tuple->src.u.dccp.port;
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return true;
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}
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static bool dccp_new(struct nf_conn *ct, const struct sk_buff *skb,
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unsigned int dataoff, unsigned int *timeouts)
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|
{
|
|
struct net *net = nf_ct_net(ct);
|
|
struct dccp_net *dn;
|
|
struct dccp_hdr _dh, *dh;
|
|
const char *msg;
|
|
u_int8_t state;
|
|
|
|
dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
|
|
BUG_ON(dh == NULL);
|
|
|
|
state = dccp_state_table[CT_DCCP_ROLE_CLIENT][dh->dccph_type][CT_DCCP_NONE];
|
|
switch (state) {
|
|
default:
|
|
dn = dccp_pernet(net);
|
|
if (dn->dccp_loose == 0) {
|
|
msg = "nf_ct_dccp: not picking up existing connection ";
|
|
goto out_invalid;
|
|
}
|
|
case CT_DCCP_REQUEST:
|
|
break;
|
|
case CT_DCCP_INVALID:
|
|
msg = "nf_ct_dccp: invalid state transition ";
|
|
goto out_invalid;
|
|
}
|
|
|
|
ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT;
|
|
ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER;
|
|
ct->proto.dccp.state = CT_DCCP_NONE;
|
|
ct->proto.dccp.last_pkt = DCCP_PKT_REQUEST;
|
|
ct->proto.dccp.last_dir = IP_CT_DIR_ORIGINAL;
|
|
ct->proto.dccp.handshake_seq = 0;
|
|
return true;
|
|
|
|
out_invalid:
|
|
if (LOG_INVALID(net, IPPROTO_DCCP))
|
|
nf_log_packet(net, nf_ct_l3num(ct), 0, skb, NULL, NULL,
|
|
NULL, msg);
|
|
return false;
|
|
}
|
|
|
|
static u64 dccp_ack_seq(const struct dccp_hdr *dh)
|
|
{
|
|
const struct dccp_hdr_ack_bits *dhack;
|
|
|
|
dhack = (void *)dh + __dccp_basic_hdr_len(dh);
|
|
return ((u64)ntohs(dhack->dccph_ack_nr_high) << 32) +
|
|
ntohl(dhack->dccph_ack_nr_low);
|
|
}
|
|
|
|
static unsigned int *dccp_get_timeouts(struct net *net)
|
|
{
|
|
return dccp_pernet(net)->dccp_timeout;
|
|
}
|
|
|
|
static int dccp_packet(struct nf_conn *ct, const struct sk_buff *skb,
|
|
unsigned int dataoff, enum ip_conntrack_info ctinfo,
|
|
u_int8_t pf, unsigned int hooknum,
|
|
unsigned int *timeouts)
|
|
{
|
|
struct net *net = nf_ct_net(ct);
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
struct dccp_hdr _dh, *dh;
|
|
u_int8_t type, old_state, new_state;
|
|
enum ct_dccp_roles role;
|
|
|
|
dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
|
|
BUG_ON(dh == NULL);
|
|
type = dh->dccph_type;
|
|
|
|
if (type == DCCP_PKT_RESET &&
|
|
!test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
|
|
/* Tear down connection immediately if only reply is a RESET */
|
|
nf_ct_kill_acct(ct, ctinfo, skb);
|
|
return NF_ACCEPT;
|
|
}
|
|
|
|
spin_lock_bh(&ct->lock);
|
|
|
|
role = ct->proto.dccp.role[dir];
|
|
old_state = ct->proto.dccp.state;
|
|
new_state = dccp_state_table[role][type][old_state];
|
|
|
|
switch (new_state) {
|
|
case CT_DCCP_REQUEST:
|
|
if (old_state == CT_DCCP_TIMEWAIT &&
|
|
role == CT_DCCP_ROLE_SERVER) {
|
|
/* Reincarnation in the reverse direction: reopen and
|
|
* reverse client/server roles. */
|
|
ct->proto.dccp.role[dir] = CT_DCCP_ROLE_CLIENT;
|
|
ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_SERVER;
|
|
}
|
|
break;
|
|
case CT_DCCP_RESPOND:
|
|
if (old_state == CT_DCCP_REQUEST)
|
|
ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh);
|
|
break;
|
|
case CT_DCCP_PARTOPEN:
|
|
if (old_state == CT_DCCP_RESPOND &&
|
|
type == DCCP_PKT_ACK &&
|
|
dccp_ack_seq(dh) == ct->proto.dccp.handshake_seq)
|
|
set_bit(IPS_ASSURED_BIT, &ct->status);
|
|
break;
|
|
case CT_DCCP_IGNORE:
|
|
/*
|
|
* Connection tracking might be out of sync, so we ignore
|
|
* packets that might establish a new connection and resync
|
|
* if the server responds with a valid Response.
|
|
*/
|
|
if (ct->proto.dccp.last_dir == !dir &&
|
|
ct->proto.dccp.last_pkt == DCCP_PKT_REQUEST &&
|
|
type == DCCP_PKT_RESPONSE) {
|
|
ct->proto.dccp.role[!dir] = CT_DCCP_ROLE_CLIENT;
|
|
ct->proto.dccp.role[dir] = CT_DCCP_ROLE_SERVER;
|
|
ct->proto.dccp.handshake_seq = dccp_hdr_seq(dh);
|
|
new_state = CT_DCCP_RESPOND;
|
|
break;
|
|
}
|
|
ct->proto.dccp.last_dir = dir;
|
|
ct->proto.dccp.last_pkt = type;
|
|
|
|
spin_unlock_bh(&ct->lock);
|
|
if (LOG_INVALID(net, IPPROTO_DCCP))
|
|
nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
|
|
"nf_ct_dccp: invalid packet ignored ");
|
|
return NF_ACCEPT;
|
|
case CT_DCCP_INVALID:
|
|
spin_unlock_bh(&ct->lock);
|
|
if (LOG_INVALID(net, IPPROTO_DCCP))
|
|
nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL,
|
|
"nf_ct_dccp: invalid state transition ");
|
|
return -NF_ACCEPT;
|
|
}
|
|
|
|
ct->proto.dccp.last_dir = dir;
|
|
ct->proto.dccp.last_pkt = type;
|
|
ct->proto.dccp.state = new_state;
|
|
spin_unlock_bh(&ct->lock);
|
|
|
|
if (new_state != old_state)
|
|
nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
|
|
|
|
nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
|
|
|
|
return NF_ACCEPT;
|
|
}
|
|
|
|
static int dccp_error(struct net *net, struct nf_conn *tmpl,
|
|
struct sk_buff *skb, unsigned int dataoff,
|
|
enum ip_conntrack_info *ctinfo,
|
|
u_int8_t pf, unsigned int hooknum)
|
|
{
|
|
struct dccp_hdr _dh, *dh;
|
|
unsigned int dccp_len = skb->len - dataoff;
|
|
unsigned int cscov;
|
|
const char *msg;
|
|
|
|
dh = skb_header_pointer(skb, dataoff, sizeof(_dh), &dh);
|
|
if (dh == NULL) {
|
|
msg = "nf_ct_dccp: short packet ";
|
|
goto out_invalid;
|
|
}
|
|
|
|
if (dh->dccph_doff * 4 < sizeof(struct dccp_hdr) ||
|
|
dh->dccph_doff * 4 > dccp_len) {
|
|
msg = "nf_ct_dccp: truncated/malformed packet ";
|
|
goto out_invalid;
|
|
}
|
|
|
|
cscov = dccp_len;
|
|
if (dh->dccph_cscov) {
|
|
cscov = (dh->dccph_cscov - 1) * 4;
|
|
if (cscov > dccp_len) {
|
|
msg = "nf_ct_dccp: bad checksum coverage ";
|
|
goto out_invalid;
|
|
}
|
|
}
|
|
|
|
if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
|
|
nf_checksum_partial(skb, hooknum, dataoff, cscov, IPPROTO_DCCP,
|
|
pf)) {
|
|
msg = "nf_ct_dccp: bad checksum ";
|
|
goto out_invalid;
|
|
}
|
|
|
|
if (dh->dccph_type >= DCCP_PKT_INVALID) {
|
|
msg = "nf_ct_dccp: reserved packet type ";
|
|
goto out_invalid;
|
|
}
|
|
|
|
return NF_ACCEPT;
|
|
|
|
out_invalid:
|
|
if (LOG_INVALID(net, IPPROTO_DCCP))
|
|
nf_log_packet(net, pf, 0, skb, NULL, NULL, NULL, msg);
|
|
return -NF_ACCEPT;
|
|
}
|
|
|
|
static int dccp_print_tuple(struct seq_file *s,
|
|
const struct nf_conntrack_tuple *tuple)
|
|
{
|
|
return seq_printf(s, "sport=%hu dport=%hu ",
|
|
ntohs(tuple->src.u.dccp.port),
|
|
ntohs(tuple->dst.u.dccp.port));
|
|
}
|
|
|
|
static int dccp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
|
|
{
|
|
return seq_printf(s, "%s ", dccp_state_names[ct->proto.dccp.state]);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
|
|
static int dccp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
|
|
struct nf_conn *ct)
|
|
{
|
|
struct nlattr *nest_parms;
|
|
|
|
spin_lock_bh(&ct->lock);
|
|
nest_parms = nla_nest_start(skb, CTA_PROTOINFO_DCCP | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
if (nla_put_u8(skb, CTA_PROTOINFO_DCCP_STATE, ct->proto.dccp.state) ||
|
|
nla_put_u8(skb, CTA_PROTOINFO_DCCP_ROLE,
|
|
ct->proto.dccp.role[IP_CT_DIR_ORIGINAL]) ||
|
|
nla_put_be64(skb, CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ,
|
|
cpu_to_be64(ct->proto.dccp.handshake_seq)))
|
|
goto nla_put_failure;
|
|
nla_nest_end(skb, nest_parms);
|
|
spin_unlock_bh(&ct->lock);
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
spin_unlock_bh(&ct->lock);
|
|
return -1;
|
|
}
|
|
|
|
static const struct nla_policy dccp_nla_policy[CTA_PROTOINFO_DCCP_MAX + 1] = {
|
|
[CTA_PROTOINFO_DCCP_STATE] = { .type = NLA_U8 },
|
|
[CTA_PROTOINFO_DCCP_ROLE] = { .type = NLA_U8 },
|
|
[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ] = { .type = NLA_U64 },
|
|
};
|
|
|
|
static int nlattr_to_dccp(struct nlattr *cda[], struct nf_conn *ct)
|
|
{
|
|
struct nlattr *attr = cda[CTA_PROTOINFO_DCCP];
|
|
struct nlattr *tb[CTA_PROTOINFO_DCCP_MAX + 1];
|
|
int err;
|
|
|
|
if (!attr)
|
|
return 0;
|
|
|
|
err = nla_parse_nested(tb, CTA_PROTOINFO_DCCP_MAX, attr,
|
|
dccp_nla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[CTA_PROTOINFO_DCCP_STATE] ||
|
|
!tb[CTA_PROTOINFO_DCCP_ROLE] ||
|
|
nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) > CT_DCCP_ROLE_MAX ||
|
|
nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]) >= CT_DCCP_IGNORE) {
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_bh(&ct->lock);
|
|
ct->proto.dccp.state = nla_get_u8(tb[CTA_PROTOINFO_DCCP_STATE]);
|
|
if (nla_get_u8(tb[CTA_PROTOINFO_DCCP_ROLE]) == CT_DCCP_ROLE_CLIENT) {
|
|
ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_CLIENT;
|
|
ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_SERVER;
|
|
} else {
|
|
ct->proto.dccp.role[IP_CT_DIR_ORIGINAL] = CT_DCCP_ROLE_SERVER;
|
|
ct->proto.dccp.role[IP_CT_DIR_REPLY] = CT_DCCP_ROLE_CLIENT;
|
|
}
|
|
if (tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]) {
|
|
ct->proto.dccp.handshake_seq =
|
|
be64_to_cpu(nla_get_be64(tb[CTA_PROTOINFO_DCCP_HANDSHAKE_SEQ]));
|
|
}
|
|
spin_unlock_bh(&ct->lock);
|
|
return 0;
|
|
}
|
|
|
|
static int dccp_nlattr_size(void)
|
|
{
|
|
return nla_total_size(0) /* CTA_PROTOINFO_DCCP */
|
|
+ nla_policy_len(dccp_nla_policy, CTA_PROTOINFO_DCCP_MAX + 1);
|
|
}
|
|
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
|
|
|
|
#include <linux/netfilter/nfnetlink.h>
|
|
#include <linux/netfilter/nfnetlink_cttimeout.h>
|
|
|
|
static int dccp_timeout_nlattr_to_obj(struct nlattr *tb[],
|
|
struct net *net, void *data)
|
|
{
|
|
struct dccp_net *dn = dccp_pernet(net);
|
|
unsigned int *timeouts = data;
|
|
int i;
|
|
|
|
/* set default DCCP timeouts. */
|
|
for (i=0; i<CT_DCCP_MAX; i++)
|
|
timeouts[i] = dn->dccp_timeout[i];
|
|
|
|
/* there's a 1:1 mapping between attributes and protocol states. */
|
|
for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) {
|
|
if (tb[i]) {
|
|
timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
dccp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
|
|
{
|
|
const unsigned int *timeouts = data;
|
|
int i;
|
|
|
|
for (i=CTA_TIMEOUT_DCCP_UNSPEC+1; i<CTA_TIMEOUT_DCCP_MAX+1; i++) {
|
|
if (nla_put_be32(skb, i, htonl(timeouts[i] / HZ)))
|
|
goto nla_put_failure;
|
|
}
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -ENOSPC;
|
|
}
|
|
|
|
static const struct nla_policy
|
|
dccp_timeout_nla_policy[CTA_TIMEOUT_DCCP_MAX+1] = {
|
|
[CTA_TIMEOUT_DCCP_REQUEST] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_DCCP_RESPOND] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_DCCP_PARTOPEN] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_DCCP_OPEN] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_DCCP_CLOSEREQ] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_DCCP_CLOSING] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_DCCP_TIMEWAIT] = { .type = NLA_U32 },
|
|
};
|
|
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
/* template, data assigned later */
|
|
static struct ctl_table dccp_sysctl_table[] = {
|
|
{
|
|
.procname = "nf_conntrack_dccp_timeout_request",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_dccp_timeout_respond",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_dccp_timeout_partopen",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_dccp_timeout_open",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_dccp_timeout_closereq",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_dccp_timeout_closing",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_dccp_timeout_timewait",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_dccp_loose",
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{ }
|
|
};
|
|
#endif /* CONFIG_SYSCTL */
|
|
|
|
static int dccp_kmemdup_sysctl_table(struct net *net, struct nf_proto_net *pn,
|
|
struct dccp_net *dn)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
if (pn->ctl_table)
|
|
return 0;
|
|
|
|
pn->ctl_table = kmemdup(dccp_sysctl_table,
|
|
sizeof(dccp_sysctl_table),
|
|
GFP_KERNEL);
|
|
if (!pn->ctl_table)
|
|
return -ENOMEM;
|
|
|
|
pn->ctl_table[0].data = &dn->dccp_timeout[CT_DCCP_REQUEST];
|
|
pn->ctl_table[1].data = &dn->dccp_timeout[CT_DCCP_RESPOND];
|
|
pn->ctl_table[2].data = &dn->dccp_timeout[CT_DCCP_PARTOPEN];
|
|
pn->ctl_table[3].data = &dn->dccp_timeout[CT_DCCP_OPEN];
|
|
pn->ctl_table[4].data = &dn->dccp_timeout[CT_DCCP_CLOSEREQ];
|
|
pn->ctl_table[5].data = &dn->dccp_timeout[CT_DCCP_CLOSING];
|
|
pn->ctl_table[6].data = &dn->dccp_timeout[CT_DCCP_TIMEWAIT];
|
|
pn->ctl_table[7].data = &dn->dccp_loose;
|
|
|
|
/* Don't export sysctls to unprivileged users */
|
|
if (net->user_ns != &init_user_ns)
|
|
pn->ctl_table[0].procname = NULL;
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int dccp_init_net(struct net *net, u_int16_t proto)
|
|
{
|
|
struct dccp_net *dn = dccp_pernet(net);
|
|
struct nf_proto_net *pn = &dn->pn;
|
|
|
|
if (!pn->users) {
|
|
/* default values */
|
|
dn->dccp_loose = 1;
|
|
dn->dccp_timeout[CT_DCCP_REQUEST] = 2 * DCCP_MSL;
|
|
dn->dccp_timeout[CT_DCCP_RESPOND] = 4 * DCCP_MSL;
|
|
dn->dccp_timeout[CT_DCCP_PARTOPEN] = 4 * DCCP_MSL;
|
|
dn->dccp_timeout[CT_DCCP_OPEN] = 12 * 3600 * HZ;
|
|
dn->dccp_timeout[CT_DCCP_CLOSEREQ] = 64 * HZ;
|
|
dn->dccp_timeout[CT_DCCP_CLOSING] = 64 * HZ;
|
|
dn->dccp_timeout[CT_DCCP_TIMEWAIT] = 2 * DCCP_MSL;
|
|
}
|
|
|
|
return dccp_kmemdup_sysctl_table(net, pn, dn);
|
|
}
|
|
|
|
static struct nf_conntrack_l4proto dccp_proto4 __read_mostly = {
|
|
.l3proto = AF_INET,
|
|
.l4proto = IPPROTO_DCCP,
|
|
.name = "dccp",
|
|
.pkt_to_tuple = dccp_pkt_to_tuple,
|
|
.invert_tuple = dccp_invert_tuple,
|
|
.new = dccp_new,
|
|
.packet = dccp_packet,
|
|
.get_timeouts = dccp_get_timeouts,
|
|
.error = dccp_error,
|
|
.print_tuple = dccp_print_tuple,
|
|
.print_conntrack = dccp_print_conntrack,
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
|
|
.to_nlattr = dccp_to_nlattr,
|
|
.nlattr_size = dccp_nlattr_size,
|
|
.from_nlattr = nlattr_to_dccp,
|
|
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
|
|
.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
|
|
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
|
|
.nla_policy = nf_ct_port_nla_policy,
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
|
|
.ctnl_timeout = {
|
|
.nlattr_to_obj = dccp_timeout_nlattr_to_obj,
|
|
.obj_to_nlattr = dccp_timeout_obj_to_nlattr,
|
|
.nlattr_max = CTA_TIMEOUT_DCCP_MAX,
|
|
.obj_size = sizeof(unsigned int) * CT_DCCP_MAX,
|
|
.nla_policy = dccp_timeout_nla_policy,
|
|
},
|
|
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
|
|
.net_id = &dccp_net_id,
|
|
.init_net = dccp_init_net,
|
|
};
|
|
|
|
static struct nf_conntrack_l4proto dccp_proto6 __read_mostly = {
|
|
.l3proto = AF_INET6,
|
|
.l4proto = IPPROTO_DCCP,
|
|
.name = "dccp",
|
|
.pkt_to_tuple = dccp_pkt_to_tuple,
|
|
.invert_tuple = dccp_invert_tuple,
|
|
.new = dccp_new,
|
|
.packet = dccp_packet,
|
|
.get_timeouts = dccp_get_timeouts,
|
|
.error = dccp_error,
|
|
.print_tuple = dccp_print_tuple,
|
|
.print_conntrack = dccp_print_conntrack,
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
|
|
.to_nlattr = dccp_to_nlattr,
|
|
.nlattr_size = dccp_nlattr_size,
|
|
.from_nlattr = nlattr_to_dccp,
|
|
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
|
|
.nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
|
|
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
|
|
.nla_policy = nf_ct_port_nla_policy,
|
|
#endif
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
|
|
.ctnl_timeout = {
|
|
.nlattr_to_obj = dccp_timeout_nlattr_to_obj,
|
|
.obj_to_nlattr = dccp_timeout_obj_to_nlattr,
|
|
.nlattr_max = CTA_TIMEOUT_DCCP_MAX,
|
|
.obj_size = sizeof(unsigned int) * CT_DCCP_MAX,
|
|
.nla_policy = dccp_timeout_nla_policy,
|
|
},
|
|
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
|
|
.net_id = &dccp_net_id,
|
|
.init_net = dccp_init_net,
|
|
};
|
|
|
|
static __net_init int dccp_net_init(struct net *net)
|
|
{
|
|
int ret = 0;
|
|
ret = nf_ct_l4proto_pernet_register(net, &dccp_proto4);
|
|
if (ret < 0) {
|
|
pr_err("nf_conntrack_dccp4: pernet registration failed.\n");
|
|
goto out;
|
|
}
|
|
ret = nf_ct_l4proto_pernet_register(net, &dccp_proto6);
|
|
if (ret < 0) {
|
|
pr_err("nf_conntrack_dccp6: pernet registration failed.\n");
|
|
goto cleanup_dccp4;
|
|
}
|
|
return 0;
|
|
cleanup_dccp4:
|
|
nf_ct_l4proto_pernet_unregister(net, &dccp_proto4);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static __net_exit void dccp_net_exit(struct net *net)
|
|
{
|
|
nf_ct_l4proto_pernet_unregister(net, &dccp_proto6);
|
|
nf_ct_l4proto_pernet_unregister(net, &dccp_proto4);
|
|
}
|
|
|
|
static struct pernet_operations dccp_net_ops = {
|
|
.init = dccp_net_init,
|
|
.exit = dccp_net_exit,
|
|
.id = &dccp_net_id,
|
|
.size = sizeof(struct dccp_net),
|
|
};
|
|
|
|
static int __init nf_conntrack_proto_dccp_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = register_pernet_subsys(&dccp_net_ops);
|
|
if (ret < 0)
|
|
goto out_pernet;
|
|
|
|
ret = nf_ct_l4proto_register(&dccp_proto4);
|
|
if (ret < 0)
|
|
goto out_dccp4;
|
|
|
|
ret = nf_ct_l4proto_register(&dccp_proto6);
|
|
if (ret < 0)
|
|
goto out_dccp6;
|
|
|
|
return 0;
|
|
out_dccp6:
|
|
nf_ct_l4proto_unregister(&dccp_proto4);
|
|
out_dccp4:
|
|
unregister_pernet_subsys(&dccp_net_ops);
|
|
out_pernet:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit nf_conntrack_proto_dccp_fini(void)
|
|
{
|
|
nf_ct_l4proto_unregister(&dccp_proto6);
|
|
nf_ct_l4proto_unregister(&dccp_proto4);
|
|
unregister_pernet_subsys(&dccp_net_ops);
|
|
}
|
|
|
|
module_init(nf_conntrack_proto_dccp_init);
|
|
module_exit(nf_conntrack_proto_dccp_fini);
|
|
|
|
MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
|
|
MODULE_DESCRIPTION("DCCP connection tracking protocol helper");
|
|
MODULE_LICENSE("GPL");
|