![Patrick McHardy](/assets/img/avatar_default.png)
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
710 lines
21 KiB
C
710 lines
21 KiB
C
/*
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* Connection tracking protocol helper module for SCTP.
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*
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* SCTP is defined in RFC 2960. References to various sections in this code
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* are to this RFC.
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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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#include <linux/types.h>
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#include <linux/timer.h>
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#include <linux/netfilter.h>
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#include <linux/module.h>
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#include <linux/in.h>
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#include <linux/ip.h>
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#include <linux/sctp.h>
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#include <linux/string.h>
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#include <linux/seq_file.h>
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#include <linux/spinlock.h>
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#include <linux/interrupt.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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#if 0
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#define DEBUGP(format, ...) printk(format, ## __VA_ARGS__)
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#else
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#define DEBUGP(format, args...)
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#endif
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/* Protects conntrack->proto.sctp */
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static DEFINE_RWLOCK(sctp_lock);
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/* FIXME: Examine ipfilter's timeouts and conntrack transitions more
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closely. They're more complex. --RR
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And so for me for SCTP :D -Kiran */
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static const char *sctp_conntrack_names[] = {
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"NONE",
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"CLOSED",
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"COOKIE_WAIT",
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"COOKIE_ECHOED",
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"ESTABLISHED",
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"SHUTDOWN_SENT",
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"SHUTDOWN_RECD",
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"SHUTDOWN_ACK_SENT",
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};
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#define SECS * HZ
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#define MINS * 60 SECS
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#define HOURS * 60 MINS
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#define DAYS * 24 HOURS
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static unsigned int nf_ct_sctp_timeout_closed __read_mostly = 10 SECS;
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static unsigned int nf_ct_sctp_timeout_cookie_wait __read_mostly = 3 SECS;
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static unsigned int nf_ct_sctp_timeout_cookie_echoed __read_mostly = 3 SECS;
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static unsigned int nf_ct_sctp_timeout_established __read_mostly = 5 DAYS;
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static unsigned int nf_ct_sctp_timeout_shutdown_sent __read_mostly = 300 SECS / 1000;
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static unsigned int nf_ct_sctp_timeout_shutdown_recd __read_mostly = 300 SECS / 1000;
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static unsigned int nf_ct_sctp_timeout_shutdown_ack_sent __read_mostly = 3 SECS;
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static unsigned int * sctp_timeouts[]
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= { NULL, /* SCTP_CONNTRACK_NONE */
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&nf_ct_sctp_timeout_closed, /* SCTP_CONNTRACK_CLOSED */
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&nf_ct_sctp_timeout_cookie_wait, /* SCTP_CONNTRACK_COOKIE_WAIT */
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&nf_ct_sctp_timeout_cookie_echoed, /* SCTP_CONNTRACK_COOKIE_ECHOED */
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&nf_ct_sctp_timeout_established, /* SCTP_CONNTRACK_ESTABLISHED */
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&nf_ct_sctp_timeout_shutdown_sent, /* SCTP_CONNTRACK_SHUTDOWN_SENT */
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&nf_ct_sctp_timeout_shutdown_recd, /* SCTP_CONNTRACK_SHUTDOWN_RECD */
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&nf_ct_sctp_timeout_shutdown_ack_sent /* SCTP_CONNTRACK_SHUTDOWN_ACK_SENT */
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};
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#define sNO SCTP_CONNTRACK_NONE
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#define sCL SCTP_CONNTRACK_CLOSED
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#define sCW SCTP_CONNTRACK_COOKIE_WAIT
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#define sCE SCTP_CONNTRACK_COOKIE_ECHOED
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#define sES SCTP_CONNTRACK_ESTABLISHED
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#define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
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#define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
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#define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
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#define sIV SCTP_CONNTRACK_MAX
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/*
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These are the descriptions of the states:
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NOTE: These state names are tantalizingly similar to the states of an
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SCTP endpoint. But the interpretation of the states is a little different,
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considering that these are the states of the connection and not of an end
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point. Please note the subtleties. -Kiran
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NONE - Nothing so far.
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COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
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an INIT_ACK chunk in the reply direction.
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COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
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ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
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SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
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SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
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SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
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to that of the SHUTDOWN chunk.
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CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
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the SHUTDOWN chunk. Connection is closed.
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*/
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/* TODO
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- I have assumed that the first INIT is in the original direction.
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This messes things when an INIT comes in the reply direction in CLOSED
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state.
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- Check the error type in the reply dir before transitioning from
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cookie echoed to closed.
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- Sec 5.2.4 of RFC 2960
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- Multi Homing support.
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*/
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/* SCTP conntrack state transitions */
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static enum sctp_conntrack sctp_conntracks[2][9][SCTP_CONNTRACK_MAX] = {
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{
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/* ORIGINAL */
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/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
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/* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA},
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/* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},
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/* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
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/* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA},
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/* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA},
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/* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant have Stale cookie*/
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/* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA},/* 5.2.4 - Big TODO */
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/* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in orig dir */
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/* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL}
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},
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{
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/* REPLY */
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/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA */
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/* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* INIT in sCL Big TODO */
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/* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},
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/* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
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/* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA},
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/* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA},
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/* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA},
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/* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA},/* Cant come in reply dir */
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/* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA},
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/* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL}
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}
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};
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static int sctp_pkt_to_tuple(const struct sk_buff *skb,
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unsigned int dataoff,
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struct nf_conntrack_tuple *tuple)
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{
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sctp_sctphdr_t _hdr, *hp;
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DEBUGP(__FUNCTION__);
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DEBUGP("\n");
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/* Actually only need first 8 bytes. */
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hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
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if (hp == NULL)
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return 0;
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tuple->src.u.sctp.port = hp->source;
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tuple->dst.u.sctp.port = hp->dest;
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return 1;
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}
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static int sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
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const struct nf_conntrack_tuple *orig)
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{
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DEBUGP(__FUNCTION__);
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DEBUGP("\n");
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tuple->src.u.sctp.port = orig->dst.u.sctp.port;
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tuple->dst.u.sctp.port = orig->src.u.sctp.port;
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return 1;
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}
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/* Print out the per-protocol part of the tuple. */
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static int sctp_print_tuple(struct seq_file *s,
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const struct nf_conntrack_tuple *tuple)
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{
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DEBUGP(__FUNCTION__);
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DEBUGP("\n");
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return seq_printf(s, "sport=%hu dport=%hu ",
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ntohs(tuple->src.u.sctp.port),
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ntohs(tuple->dst.u.sctp.port));
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}
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/* Print out the private part of the conntrack. */
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static int sctp_print_conntrack(struct seq_file *s,
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const struct nf_conn *conntrack)
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{
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enum sctp_conntrack state;
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DEBUGP(__FUNCTION__);
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DEBUGP("\n");
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read_lock_bh(&sctp_lock);
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state = conntrack->proto.sctp.state;
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read_unlock_bh(&sctp_lock);
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return seq_printf(s, "%s ", sctp_conntrack_names[state]);
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}
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#define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
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for (offset = dataoff + sizeof(sctp_sctphdr_t), count = 0; \
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offset < skb->len && \
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(sch = skb_header_pointer(skb, offset, sizeof(_sch), &_sch)); \
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offset += (ntohs(sch->length) + 3) & ~3, count++)
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/* Some validity checks to make sure the chunks are fine */
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static int do_basic_checks(struct nf_conn *conntrack,
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const struct sk_buff *skb,
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unsigned int dataoff,
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char *map)
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{
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u_int32_t offset, count;
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sctp_chunkhdr_t _sch, *sch;
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int flag;
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DEBUGP(__FUNCTION__);
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DEBUGP("\n");
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flag = 0;
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for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
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DEBUGP("Chunk Num: %d Type: %d\n", count, sch->type);
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if (sch->type == SCTP_CID_INIT
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|| sch->type == SCTP_CID_INIT_ACK
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|| sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
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flag = 1;
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}
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/*
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* Cookie Ack/Echo chunks not the first OR
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* Init / Init Ack / Shutdown compl chunks not the only chunks
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* OR zero-length.
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*/
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if (((sch->type == SCTP_CID_COOKIE_ACK
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|| sch->type == SCTP_CID_COOKIE_ECHO
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|| flag)
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&& count !=0) || !sch->length) {
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DEBUGP("Basic checks failed\n");
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return 1;
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}
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if (map) {
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set_bit(sch->type, (void *)map);
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}
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}
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DEBUGP("Basic checks passed\n");
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return count == 0;
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}
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static int new_state(enum ip_conntrack_dir dir,
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enum sctp_conntrack cur_state,
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int chunk_type)
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{
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int i;
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DEBUGP(__FUNCTION__);
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DEBUGP("\n");
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DEBUGP("Chunk type: %d\n", chunk_type);
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switch (chunk_type) {
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case SCTP_CID_INIT:
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DEBUGP("SCTP_CID_INIT\n");
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i = 0; break;
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case SCTP_CID_INIT_ACK:
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DEBUGP("SCTP_CID_INIT_ACK\n");
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i = 1; break;
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case SCTP_CID_ABORT:
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DEBUGP("SCTP_CID_ABORT\n");
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i = 2; break;
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case SCTP_CID_SHUTDOWN:
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DEBUGP("SCTP_CID_SHUTDOWN\n");
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i = 3; break;
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case SCTP_CID_SHUTDOWN_ACK:
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DEBUGP("SCTP_CID_SHUTDOWN_ACK\n");
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i = 4; break;
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case SCTP_CID_ERROR:
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DEBUGP("SCTP_CID_ERROR\n");
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i = 5; break;
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case SCTP_CID_COOKIE_ECHO:
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DEBUGP("SCTP_CID_COOKIE_ECHO\n");
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i = 6; break;
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case SCTP_CID_COOKIE_ACK:
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DEBUGP("SCTP_CID_COOKIE_ACK\n");
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i = 7; break;
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case SCTP_CID_SHUTDOWN_COMPLETE:
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DEBUGP("SCTP_CID_SHUTDOWN_COMPLETE\n");
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i = 8; break;
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default:
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/* Other chunks like DATA, SACK, HEARTBEAT and
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its ACK do not cause a change in state */
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DEBUGP("Unknown chunk type, Will stay in %s\n",
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sctp_conntrack_names[cur_state]);
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return cur_state;
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}
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DEBUGP("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
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dir, sctp_conntrack_names[cur_state], chunk_type,
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sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
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return sctp_conntracks[dir][i][cur_state];
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}
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/* Returns verdict for packet, or -1 for invalid. */
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static int sctp_packet(struct nf_conn *conntrack,
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const struct sk_buff *skb,
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unsigned int dataoff,
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enum ip_conntrack_info ctinfo,
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int pf,
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unsigned int hooknum)
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{
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enum sctp_conntrack newconntrack, oldsctpstate;
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sctp_sctphdr_t _sctph, *sh;
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sctp_chunkhdr_t _sch, *sch;
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u_int32_t offset, count;
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char map[256 / sizeof (char)] = {0};
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DEBUGP(__FUNCTION__);
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DEBUGP("\n");
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sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
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if (sh == NULL)
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return -1;
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if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
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return -1;
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/* Check the verification tag (Sec 8.5) */
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if (!test_bit(SCTP_CID_INIT, (void *)map)
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&& !test_bit(SCTP_CID_SHUTDOWN_COMPLETE, (void *)map)
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&& !test_bit(SCTP_CID_COOKIE_ECHO, (void *)map)
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&& !test_bit(SCTP_CID_ABORT, (void *)map)
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&& !test_bit(SCTP_CID_SHUTDOWN_ACK, (void *)map)
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&& (sh->vtag != conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
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DEBUGP("Verification tag check failed\n");
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return -1;
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}
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oldsctpstate = newconntrack = SCTP_CONNTRACK_MAX;
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for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
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write_lock_bh(&sctp_lock);
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/* Special cases of Verification tag check (Sec 8.5.1) */
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if (sch->type == SCTP_CID_INIT) {
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/* Sec 8.5.1 (A) */
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if (sh->vtag != 0) {
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write_unlock_bh(&sctp_lock);
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return -1;
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}
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} else if (sch->type == SCTP_CID_ABORT) {
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/* Sec 8.5.1 (B) */
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if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
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&& !(sh->vtag == conntrack->proto.sctp.vtag
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[1 - CTINFO2DIR(ctinfo)])) {
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write_unlock_bh(&sctp_lock);
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return -1;
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}
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} else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
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/* Sec 8.5.1 (C) */
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if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])
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&& !(sh->vtag == conntrack->proto.sctp.vtag
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[1 - CTINFO2DIR(ctinfo)]
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&& (sch->flags & 1))) {
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write_unlock_bh(&sctp_lock);
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return -1;
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}
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} else if (sch->type == SCTP_CID_COOKIE_ECHO) {
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/* Sec 8.5.1 (D) */
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if (!(sh->vtag == conntrack->proto.sctp.vtag[CTINFO2DIR(ctinfo)])) {
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write_unlock_bh(&sctp_lock);
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return -1;
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}
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}
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oldsctpstate = conntrack->proto.sctp.state;
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newconntrack = new_state(CTINFO2DIR(ctinfo), oldsctpstate, sch->type);
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/* Invalid */
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if (newconntrack == SCTP_CONNTRACK_MAX) {
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DEBUGP("nf_conntrack_sctp: Invalid dir=%i ctype=%u conntrack=%u\n",
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CTINFO2DIR(ctinfo), sch->type, oldsctpstate);
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write_unlock_bh(&sctp_lock);
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return -1;
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}
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/* If it is an INIT or an INIT ACK note down the vtag */
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if (sch->type == SCTP_CID_INIT
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|| sch->type == SCTP_CID_INIT_ACK) {
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sctp_inithdr_t _inithdr, *ih;
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ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
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sizeof(_inithdr), &_inithdr);
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if (ih == NULL) {
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write_unlock_bh(&sctp_lock);
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return -1;
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}
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DEBUGP("Setting vtag %x for dir %d\n",
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ih->init_tag, !CTINFO2DIR(ctinfo));
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conntrack->proto.sctp.vtag[!CTINFO2DIR(ctinfo)] = ih->init_tag;
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}
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conntrack->proto.sctp.state = newconntrack;
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if (oldsctpstate != newconntrack)
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nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
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write_unlock_bh(&sctp_lock);
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}
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nf_ct_refresh_acct(conntrack, ctinfo, skb, *sctp_timeouts[newconntrack]);
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if (oldsctpstate == SCTP_CONNTRACK_COOKIE_ECHOED
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&& CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY
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&& newconntrack == SCTP_CONNTRACK_ESTABLISHED) {
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DEBUGP("Setting assured bit\n");
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set_bit(IPS_ASSURED_BIT, &conntrack->status);
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nf_conntrack_event_cache(IPCT_STATUS, skb);
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}
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return NF_ACCEPT;
|
|
}
|
|
|
|
/* Called when a new connection for this protocol found. */
|
|
static int sctp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
|
|
unsigned int dataoff)
|
|
{
|
|
enum sctp_conntrack newconntrack;
|
|
sctp_sctphdr_t _sctph, *sh;
|
|
sctp_chunkhdr_t _sch, *sch;
|
|
u_int32_t offset, count;
|
|
char map[256 / sizeof (char)] = {0};
|
|
|
|
DEBUGP(__FUNCTION__);
|
|
DEBUGP("\n");
|
|
|
|
sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
|
|
if (sh == NULL)
|
|
return 0;
|
|
|
|
if (do_basic_checks(conntrack, skb, dataoff, map) != 0)
|
|
return 0;
|
|
|
|
/* If an OOTB packet has any of these chunks discard (Sec 8.4) */
|
|
if ((test_bit (SCTP_CID_ABORT, (void *)map))
|
|
|| (test_bit (SCTP_CID_SHUTDOWN_COMPLETE, (void *)map))
|
|
|| (test_bit (SCTP_CID_COOKIE_ACK, (void *)map))) {
|
|
return 0;
|
|
}
|
|
|
|
newconntrack = SCTP_CONNTRACK_MAX;
|
|
for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
|
|
/* Don't need lock here: this conntrack not in circulation yet */
|
|
newconntrack = new_state(IP_CT_DIR_ORIGINAL,
|
|
SCTP_CONNTRACK_NONE, sch->type);
|
|
|
|
/* Invalid: delete conntrack */
|
|
if (newconntrack == SCTP_CONNTRACK_MAX) {
|
|
DEBUGP("nf_conntrack_sctp: invalid new deleting.\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Copy the vtag into the state info */
|
|
if (sch->type == SCTP_CID_INIT) {
|
|
if (sh->vtag == 0) {
|
|
sctp_inithdr_t _inithdr, *ih;
|
|
|
|
ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
|
|
sizeof(_inithdr), &_inithdr);
|
|
if (ih == NULL)
|
|
return 0;
|
|
|
|
DEBUGP("Setting vtag %x for new conn\n",
|
|
ih->init_tag);
|
|
|
|
conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] =
|
|
ih->init_tag;
|
|
} else {
|
|
/* Sec 8.5.1 (A) */
|
|
return 0;
|
|
}
|
|
}
|
|
/* If it is a shutdown ack OOTB packet, we expect a return
|
|
shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
|
|
else {
|
|
DEBUGP("Setting vtag %x for new conn OOTB\n",
|
|
sh->vtag);
|
|
conntrack->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
|
|
}
|
|
|
|
conntrack->proto.sctp.state = newconntrack;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static unsigned int sctp_sysctl_table_users;
|
|
static struct ctl_table_header *sctp_sysctl_header;
|
|
static struct ctl_table sctp_sysctl_table[] = {
|
|
{
|
|
.ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
|
|
.procname = "nf_conntrack_sctp_timeout_closed",
|
|
.data = &nf_ct_sctp_timeout_closed,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
|
|
.procname = "nf_conntrack_sctp_timeout_cookie_wait",
|
|
.data = &nf_ct_sctp_timeout_cookie_wait,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
|
|
.procname = "nf_conntrack_sctp_timeout_cookie_echoed",
|
|
.data = &nf_ct_sctp_timeout_cookie_echoed,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
|
|
.procname = "nf_conntrack_sctp_timeout_established",
|
|
.data = &nf_ct_sctp_timeout_established,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
|
|
.procname = "nf_conntrack_sctp_timeout_shutdown_sent",
|
|
.data = &nf_ct_sctp_timeout_shutdown_sent,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
|
|
.procname = "nf_conntrack_sctp_timeout_shutdown_recd",
|
|
.data = &nf_ct_sctp_timeout_shutdown_recd,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
|
|
.procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
|
|
.data = &nf_ct_sctp_timeout_shutdown_ack_sent,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = 0
|
|
}
|
|
};
|
|
|
|
#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
|
|
static struct ctl_table sctp_compat_sysctl_table[] = {
|
|
{
|
|
.ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_CLOSED,
|
|
.procname = "ip_conntrack_sctp_timeout_closed",
|
|
.data = &nf_ct_sctp_timeout_closed,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_WAIT,
|
|
.procname = "ip_conntrack_sctp_timeout_cookie_wait",
|
|
.data = &nf_ct_sctp_timeout_cookie_wait,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_COOKIE_ECHOED,
|
|
.procname = "ip_conntrack_sctp_timeout_cookie_echoed",
|
|
.data = &nf_ct_sctp_timeout_cookie_echoed,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_ESTABLISHED,
|
|
.procname = "ip_conntrack_sctp_timeout_established",
|
|
.data = &nf_ct_sctp_timeout_established,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_SENT,
|
|
.procname = "ip_conntrack_sctp_timeout_shutdown_sent",
|
|
.data = &nf_ct_sctp_timeout_shutdown_sent,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_RECD,
|
|
.procname = "ip_conntrack_sctp_timeout_shutdown_recd",
|
|
.data = &nf_ct_sctp_timeout_shutdown_recd,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = NET_IPV4_NF_CONNTRACK_SCTP_TIMEOUT_SHUTDOWN_ACK_SENT,
|
|
.procname = "ip_conntrack_sctp_timeout_shutdown_ack_sent",
|
|
.data = &nf_ct_sctp_timeout_shutdown_ack_sent,
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = &proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.ctl_name = 0
|
|
}
|
|
};
|
|
#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
|
|
#endif
|
|
|
|
struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 = {
|
|
.l3proto = PF_INET,
|
|
.l4proto = IPPROTO_SCTP,
|
|
.name = "sctp",
|
|
.pkt_to_tuple = sctp_pkt_to_tuple,
|
|
.invert_tuple = sctp_invert_tuple,
|
|
.print_tuple = sctp_print_tuple,
|
|
.print_conntrack = sctp_print_conntrack,
|
|
.packet = sctp_packet,
|
|
.new = sctp_new,
|
|
.me = THIS_MODULE,
|
|
#ifdef CONFIG_SYSCTL
|
|
.ctl_table_users = &sctp_sysctl_table_users,
|
|
.ctl_table_header = &sctp_sysctl_header,
|
|
.ctl_table = sctp_sysctl_table,
|
|
#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
|
|
.ctl_compat_table = sctp_compat_sysctl_table,
|
|
#endif
|
|
#endif
|
|
};
|
|
|
|
struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 = {
|
|
.l3proto = PF_INET6,
|
|
.l4proto = IPPROTO_SCTP,
|
|
.name = "sctp",
|
|
.pkt_to_tuple = sctp_pkt_to_tuple,
|
|
.invert_tuple = sctp_invert_tuple,
|
|
.print_tuple = sctp_print_tuple,
|
|
.print_conntrack = sctp_print_conntrack,
|
|
.packet = sctp_packet,
|
|
.new = sctp_new,
|
|
.me = THIS_MODULE,
|
|
#ifdef CONFIG_SYSCTL
|
|
.ctl_table_users = &sctp_sysctl_table_users,
|
|
.ctl_table_header = &sctp_sysctl_header,
|
|
.ctl_table = sctp_sysctl_table,
|
|
#endif
|
|
};
|
|
|
|
int __init nf_conntrack_proto_sctp_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp4);
|
|
if (ret) {
|
|
printk("nf_conntrack_l4proto_sctp4: protocol register failed\n");
|
|
goto out;
|
|
}
|
|
ret = nf_conntrack_l4proto_register(&nf_conntrack_l4proto_sctp6);
|
|
if (ret) {
|
|
printk("nf_conntrack_l4proto_sctp6: protocol register failed\n");
|
|
goto cleanup_sctp4;
|
|
}
|
|
|
|
return ret;
|
|
|
|
cleanup_sctp4:
|
|
nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
|
|
out:
|
|
DEBUGP("SCTP conntrack module loading %s\n",
|
|
ret ? "failed": "succeeded");
|
|
return ret;
|
|
}
|
|
|
|
void __exit nf_conntrack_proto_sctp_fini(void)
|
|
{
|
|
nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp6);
|
|
nf_conntrack_l4proto_unregister(&nf_conntrack_l4proto_sctp4);
|
|
DEBUGP("SCTP conntrack module unloaded\n");
|
|
}
|
|
|
|
module_init(nf_conntrack_proto_sctp_init);
|
|
module_exit(nf_conntrack_proto_sctp_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Kiran Kumar Immidi");
|
|
MODULE_DESCRIPTION("Netfilter connection tracking protocol helper for SCTP");
|
|
MODULE_ALIAS("ip_conntrack_proto_sctp");
|