mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-27 19:29:37 +00:00
![Davide Caratti](/assets/img/avatar_default.png)
CONFIG_NF_CT_PROTO_SCTP is no more a tristate. When set to y, connection tracking support for SCTP protocol is built-in into nf_conntrack.ko. footprint test: $ ls -l net/netfilter/nf_conntrack{_proto_sctp,}.ko \ net/ipv4/netfilter/nf_conntrack_ipv4.ko \ net/ipv6/netfilter/nf_conntrack_ipv6.ko (builtin)|| sctp | ipv4 | ipv6 | nf_conntrack ---------++--------+--------+--------+-------------- none || 498243 | 828755 | 828676 | 6141434 SCTP || - | 829254 | 829175 | 6547872 Signed-off-by: Davide Caratti <dcaratti@redhat.com> Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
810 lines
24 KiB
C
810 lines
24 KiB
C
/*
|
|
* Connection tracking protocol helper module for SCTP.
|
|
*
|
|
* Copyright (c) 2004 Kiran Kumar Immidi <immidi_kiran@yahoo.com>
|
|
* Copyright (c) 2004-2012 Patrick McHardy <kaber@trash.net>
|
|
*
|
|
* SCTP is defined in RFC 2960. References to various sections in this code
|
|
* are to this RFC.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/timer.h>
|
|
#include <linux/netfilter.h>
|
|
#include <linux/in.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/sctp.h>
|
|
#include <linux/string.h>
|
|
#include <linux/seq_file.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/interrupt.h>
|
|
|
|
#include <net/netfilter/nf_conntrack.h>
|
|
#include <net/netfilter/nf_conntrack_l4proto.h>
|
|
#include <net/netfilter/nf_conntrack_ecache.h>
|
|
|
|
/* FIXME: Examine ipfilter's timeouts and conntrack transitions more
|
|
closely. They're more complex. --RR
|
|
|
|
And so for me for SCTP :D -Kiran */
|
|
|
|
static const char *const sctp_conntrack_names[] = {
|
|
"NONE",
|
|
"CLOSED",
|
|
"COOKIE_WAIT",
|
|
"COOKIE_ECHOED",
|
|
"ESTABLISHED",
|
|
"SHUTDOWN_SENT",
|
|
"SHUTDOWN_RECD",
|
|
"SHUTDOWN_ACK_SENT",
|
|
"HEARTBEAT_SENT",
|
|
"HEARTBEAT_ACKED",
|
|
};
|
|
|
|
#define SECS * HZ
|
|
#define MINS * 60 SECS
|
|
#define HOURS * 60 MINS
|
|
#define DAYS * 24 HOURS
|
|
|
|
static unsigned int sctp_timeouts[SCTP_CONNTRACK_MAX] __read_mostly = {
|
|
[SCTP_CONNTRACK_CLOSED] = 10 SECS,
|
|
[SCTP_CONNTRACK_COOKIE_WAIT] = 3 SECS,
|
|
[SCTP_CONNTRACK_COOKIE_ECHOED] = 3 SECS,
|
|
[SCTP_CONNTRACK_ESTABLISHED] = 5 DAYS,
|
|
[SCTP_CONNTRACK_SHUTDOWN_SENT] = 300 SECS / 1000,
|
|
[SCTP_CONNTRACK_SHUTDOWN_RECD] = 300 SECS / 1000,
|
|
[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT] = 3 SECS,
|
|
[SCTP_CONNTRACK_HEARTBEAT_SENT] = 30 SECS,
|
|
[SCTP_CONNTRACK_HEARTBEAT_ACKED] = 210 SECS,
|
|
};
|
|
|
|
#define sNO SCTP_CONNTRACK_NONE
|
|
#define sCL SCTP_CONNTRACK_CLOSED
|
|
#define sCW SCTP_CONNTRACK_COOKIE_WAIT
|
|
#define sCE SCTP_CONNTRACK_COOKIE_ECHOED
|
|
#define sES SCTP_CONNTRACK_ESTABLISHED
|
|
#define sSS SCTP_CONNTRACK_SHUTDOWN_SENT
|
|
#define sSR SCTP_CONNTRACK_SHUTDOWN_RECD
|
|
#define sSA SCTP_CONNTRACK_SHUTDOWN_ACK_SENT
|
|
#define sHS SCTP_CONNTRACK_HEARTBEAT_SENT
|
|
#define sHA SCTP_CONNTRACK_HEARTBEAT_ACKED
|
|
#define sIV SCTP_CONNTRACK_MAX
|
|
|
|
/*
|
|
These are the descriptions of the states:
|
|
|
|
NOTE: These state names are tantalizingly similar to the states of an
|
|
SCTP endpoint. But the interpretation of the states is a little different,
|
|
considering that these are the states of the connection and not of an end
|
|
point. Please note the subtleties. -Kiran
|
|
|
|
NONE - Nothing so far.
|
|
COOKIE WAIT - We have seen an INIT chunk in the original direction, or also
|
|
an INIT_ACK chunk in the reply direction.
|
|
COOKIE ECHOED - We have seen a COOKIE_ECHO chunk in the original direction.
|
|
ESTABLISHED - We have seen a COOKIE_ACK in the reply direction.
|
|
SHUTDOWN_SENT - We have seen a SHUTDOWN chunk in the original direction.
|
|
SHUTDOWN_RECD - We have seen a SHUTDOWN chunk in the reply directoin.
|
|
SHUTDOWN_ACK_SENT - We have seen a SHUTDOWN_ACK chunk in the direction opposite
|
|
to that of the SHUTDOWN chunk.
|
|
CLOSED - We have seen a SHUTDOWN_COMPLETE chunk in the direction of
|
|
the SHUTDOWN chunk. Connection is closed.
|
|
HEARTBEAT_SENT - We have seen a HEARTBEAT in a new flow.
|
|
HEARTBEAT_ACKED - We have seen a HEARTBEAT-ACK in the direction opposite to
|
|
that of the HEARTBEAT chunk. Secondary connection is
|
|
established.
|
|
*/
|
|
|
|
/* TODO
|
|
- I have assumed that the first INIT is in the original direction.
|
|
This messes things when an INIT comes in the reply direction in CLOSED
|
|
state.
|
|
- Check the error type in the reply dir before transitioning from
|
|
cookie echoed to closed.
|
|
- Sec 5.2.4 of RFC 2960
|
|
- Full Multi Homing support.
|
|
*/
|
|
|
|
/* SCTP conntrack state transitions */
|
|
static const u8 sctp_conntracks[2][11][SCTP_CONNTRACK_MAX] = {
|
|
{
|
|
/* ORIGINAL */
|
|
/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
|
|
/* init */ {sCW, sCW, sCW, sCE, sES, sSS, sSR, sSA, sCW, sHA},
|
|
/* init_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},
|
|
/* abort */ {sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL},
|
|
/* shutdown */ {sCL, sCL, sCW, sCE, sSS, sSS, sSR, sSA, sCL, sSS},
|
|
/* shutdown_ack */ {sSA, sCL, sCW, sCE, sES, sSA, sSA, sSA, sSA, sHA},
|
|
/* error */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't have Stale cookie*/
|
|
/* cookie_echo */ {sCL, sCL, sCE, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* 5.2.4 - Big TODO */
|
|
/* cookie_ack */ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sCL, sHA},/* Can't come in orig dir */
|
|
/* shutdown_comp*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sCL, sCL, sHA},
|
|
/* heartbeat */ {sHS, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
|
|
/* heartbeat_ack*/ {sCL, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA}
|
|
},
|
|
{
|
|
/* REPLY */
|
|
/* sNO, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA */
|
|
/* init */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* INIT in sCL Big TODO */
|
|
/* init_ack */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},
|
|
/* abort */ {sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV, sCL},
|
|
/* shutdown */ {sIV, sCL, sCW, sCE, sSR, sSS, sSR, sSA, sIV, sSR},
|
|
/* shutdown_ack */ {sIV, sCL, sCW, sCE, sES, sSA, sSA, sSA, sIV, sHA},
|
|
/* error */ {sIV, sCL, sCW, sCL, sES, sSS, sSR, sSA, sIV, sHA},
|
|
/* cookie_echo */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sIV, sHA},/* Can't come in reply dir */
|
|
/* cookie_ack */ {sIV, sCL, sCW, sES, sES, sSS, sSR, sSA, sIV, sHA},
|
|
/* shutdown_comp*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sCL, sIV, sHA},
|
|
/* heartbeat */ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHS, sHA},
|
|
/* heartbeat_ack*/ {sIV, sCL, sCW, sCE, sES, sSS, sSR, sSA, sHA, sHA}
|
|
}
|
|
};
|
|
|
|
static inline struct nf_sctp_net *sctp_pernet(struct net *net)
|
|
{
|
|
return &net->ct.nf_ct_proto.sctp;
|
|
}
|
|
|
|
static bool sctp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
|
|
struct net *net, struct nf_conntrack_tuple *tuple)
|
|
{
|
|
const struct sctphdr *hp;
|
|
struct sctphdr _hdr;
|
|
|
|
/* Actually only need first 4 bytes to get ports. */
|
|
hp = skb_header_pointer(skb, dataoff, 4, &_hdr);
|
|
if (hp == NULL)
|
|
return false;
|
|
|
|
tuple->src.u.sctp.port = hp->source;
|
|
tuple->dst.u.sctp.port = hp->dest;
|
|
return true;
|
|
}
|
|
|
|
static bool sctp_invert_tuple(struct nf_conntrack_tuple *tuple,
|
|
const struct nf_conntrack_tuple *orig)
|
|
{
|
|
tuple->src.u.sctp.port = orig->dst.u.sctp.port;
|
|
tuple->dst.u.sctp.port = orig->src.u.sctp.port;
|
|
return true;
|
|
}
|
|
|
|
/* Print out the per-protocol part of the tuple. */
|
|
static void sctp_print_tuple(struct seq_file *s,
|
|
const struct nf_conntrack_tuple *tuple)
|
|
{
|
|
seq_printf(s, "sport=%hu dport=%hu ",
|
|
ntohs(tuple->src.u.sctp.port),
|
|
ntohs(tuple->dst.u.sctp.port));
|
|
}
|
|
|
|
/* Print out the private part of the conntrack. */
|
|
static void sctp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
|
|
{
|
|
seq_printf(s, "%s ", sctp_conntrack_names[ct->proto.sctp.state]);
|
|
}
|
|
|
|
#define for_each_sctp_chunk(skb, sch, _sch, offset, dataoff, count) \
|
|
for ((offset) = (dataoff) + sizeof(sctp_sctphdr_t), (count) = 0; \
|
|
(offset) < (skb)->len && \
|
|
((sch) = skb_header_pointer((skb), (offset), sizeof(_sch), &(_sch))); \
|
|
(offset) += (ntohs((sch)->length) + 3) & ~3, (count)++)
|
|
|
|
/* Some validity checks to make sure the chunks are fine */
|
|
static int do_basic_checks(struct nf_conn *ct,
|
|
const struct sk_buff *skb,
|
|
unsigned int dataoff,
|
|
unsigned long *map)
|
|
{
|
|
u_int32_t offset, count;
|
|
sctp_chunkhdr_t _sch, *sch;
|
|
int flag;
|
|
|
|
flag = 0;
|
|
|
|
for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
|
|
pr_debug("Chunk Num: %d Type: %d\n", count, sch->type);
|
|
|
|
if (sch->type == SCTP_CID_INIT ||
|
|
sch->type == SCTP_CID_INIT_ACK ||
|
|
sch->type == SCTP_CID_SHUTDOWN_COMPLETE)
|
|
flag = 1;
|
|
|
|
/*
|
|
* Cookie Ack/Echo chunks not the first OR
|
|
* Init / Init Ack / Shutdown compl chunks not the only chunks
|
|
* OR zero-length.
|
|
*/
|
|
if (((sch->type == SCTP_CID_COOKIE_ACK ||
|
|
sch->type == SCTP_CID_COOKIE_ECHO ||
|
|
flag) &&
|
|
count != 0) || !sch->length) {
|
|
pr_debug("Basic checks failed\n");
|
|
return 1;
|
|
}
|
|
|
|
if (map)
|
|
set_bit(sch->type, map);
|
|
}
|
|
|
|
pr_debug("Basic checks passed\n");
|
|
return count == 0;
|
|
}
|
|
|
|
static int sctp_new_state(enum ip_conntrack_dir dir,
|
|
enum sctp_conntrack cur_state,
|
|
int chunk_type)
|
|
{
|
|
int i;
|
|
|
|
pr_debug("Chunk type: %d\n", chunk_type);
|
|
|
|
switch (chunk_type) {
|
|
case SCTP_CID_INIT:
|
|
pr_debug("SCTP_CID_INIT\n");
|
|
i = 0;
|
|
break;
|
|
case SCTP_CID_INIT_ACK:
|
|
pr_debug("SCTP_CID_INIT_ACK\n");
|
|
i = 1;
|
|
break;
|
|
case SCTP_CID_ABORT:
|
|
pr_debug("SCTP_CID_ABORT\n");
|
|
i = 2;
|
|
break;
|
|
case SCTP_CID_SHUTDOWN:
|
|
pr_debug("SCTP_CID_SHUTDOWN\n");
|
|
i = 3;
|
|
break;
|
|
case SCTP_CID_SHUTDOWN_ACK:
|
|
pr_debug("SCTP_CID_SHUTDOWN_ACK\n");
|
|
i = 4;
|
|
break;
|
|
case SCTP_CID_ERROR:
|
|
pr_debug("SCTP_CID_ERROR\n");
|
|
i = 5;
|
|
break;
|
|
case SCTP_CID_COOKIE_ECHO:
|
|
pr_debug("SCTP_CID_COOKIE_ECHO\n");
|
|
i = 6;
|
|
break;
|
|
case SCTP_CID_COOKIE_ACK:
|
|
pr_debug("SCTP_CID_COOKIE_ACK\n");
|
|
i = 7;
|
|
break;
|
|
case SCTP_CID_SHUTDOWN_COMPLETE:
|
|
pr_debug("SCTP_CID_SHUTDOWN_COMPLETE\n");
|
|
i = 8;
|
|
break;
|
|
case SCTP_CID_HEARTBEAT:
|
|
pr_debug("SCTP_CID_HEARTBEAT");
|
|
i = 9;
|
|
break;
|
|
case SCTP_CID_HEARTBEAT_ACK:
|
|
pr_debug("SCTP_CID_HEARTBEAT_ACK");
|
|
i = 10;
|
|
break;
|
|
default:
|
|
/* Other chunks like DATA or SACK do not change the state */
|
|
pr_debug("Unknown chunk type, Will stay in %s\n",
|
|
sctp_conntrack_names[cur_state]);
|
|
return cur_state;
|
|
}
|
|
|
|
pr_debug("dir: %d cur_state: %s chunk_type: %d new_state: %s\n",
|
|
dir, sctp_conntrack_names[cur_state], chunk_type,
|
|
sctp_conntrack_names[sctp_conntracks[dir][i][cur_state]]);
|
|
|
|
return sctp_conntracks[dir][i][cur_state];
|
|
}
|
|
|
|
static unsigned int *sctp_get_timeouts(struct net *net)
|
|
{
|
|
return sctp_pernet(net)->timeouts;
|
|
}
|
|
|
|
/* Returns verdict for packet, or -NF_ACCEPT for invalid. */
|
|
static int sctp_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)
|
|
{
|
|
enum sctp_conntrack new_state, old_state;
|
|
enum ip_conntrack_dir dir = CTINFO2DIR(ctinfo);
|
|
const struct sctphdr *sh;
|
|
struct sctphdr _sctph;
|
|
const struct sctp_chunkhdr *sch;
|
|
struct sctp_chunkhdr _sch;
|
|
u_int32_t offset, count;
|
|
unsigned long map[256 / sizeof(unsigned long)] = { 0 };
|
|
|
|
sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
|
|
if (sh == NULL)
|
|
goto out;
|
|
|
|
if (do_basic_checks(ct, skb, dataoff, map) != 0)
|
|
goto out;
|
|
|
|
/* Check the verification tag (Sec 8.5) */
|
|
if (!test_bit(SCTP_CID_INIT, map) &&
|
|
!test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) &&
|
|
!test_bit(SCTP_CID_COOKIE_ECHO, map) &&
|
|
!test_bit(SCTP_CID_ABORT, map) &&
|
|
!test_bit(SCTP_CID_SHUTDOWN_ACK, map) &&
|
|
!test_bit(SCTP_CID_HEARTBEAT, map) &&
|
|
!test_bit(SCTP_CID_HEARTBEAT_ACK, map) &&
|
|
sh->vtag != ct->proto.sctp.vtag[dir]) {
|
|
pr_debug("Verification tag check failed\n");
|
|
goto out;
|
|
}
|
|
|
|
old_state = new_state = SCTP_CONNTRACK_NONE;
|
|
spin_lock_bh(&ct->lock);
|
|
for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
|
|
/* Special cases of Verification tag check (Sec 8.5.1) */
|
|
if (sch->type == SCTP_CID_INIT) {
|
|
/* Sec 8.5.1 (A) */
|
|
if (sh->vtag != 0)
|
|
goto out_unlock;
|
|
} else if (sch->type == SCTP_CID_ABORT) {
|
|
/* Sec 8.5.1 (B) */
|
|
if (sh->vtag != ct->proto.sctp.vtag[dir] &&
|
|
sh->vtag != ct->proto.sctp.vtag[!dir])
|
|
goto out_unlock;
|
|
} else if (sch->type == SCTP_CID_SHUTDOWN_COMPLETE) {
|
|
/* Sec 8.5.1 (C) */
|
|
if (sh->vtag != ct->proto.sctp.vtag[dir] &&
|
|
sh->vtag != ct->proto.sctp.vtag[!dir] &&
|
|
sch->flags & SCTP_CHUNK_FLAG_T)
|
|
goto out_unlock;
|
|
} else if (sch->type == SCTP_CID_COOKIE_ECHO) {
|
|
/* Sec 8.5.1 (D) */
|
|
if (sh->vtag != ct->proto.sctp.vtag[dir])
|
|
goto out_unlock;
|
|
} else if (sch->type == SCTP_CID_HEARTBEAT ||
|
|
sch->type == SCTP_CID_HEARTBEAT_ACK) {
|
|
if (ct->proto.sctp.vtag[dir] == 0) {
|
|
pr_debug("Setting vtag %x for dir %d\n",
|
|
sh->vtag, dir);
|
|
ct->proto.sctp.vtag[dir] = sh->vtag;
|
|
} else if (sh->vtag != ct->proto.sctp.vtag[dir]) {
|
|
pr_debug("Verification tag check failed\n");
|
|
goto out_unlock;
|
|
}
|
|
}
|
|
|
|
old_state = ct->proto.sctp.state;
|
|
new_state = sctp_new_state(dir, old_state, sch->type);
|
|
|
|
/* Invalid */
|
|
if (new_state == SCTP_CONNTRACK_MAX) {
|
|
pr_debug("nf_conntrack_sctp: Invalid dir=%i ctype=%u "
|
|
"conntrack=%u\n",
|
|
dir, sch->type, old_state);
|
|
goto out_unlock;
|
|
}
|
|
|
|
/* If it is an INIT or an INIT ACK note down the vtag */
|
|
if (sch->type == SCTP_CID_INIT ||
|
|
sch->type == SCTP_CID_INIT_ACK) {
|
|
sctp_inithdr_t _inithdr, *ih;
|
|
|
|
ih = skb_header_pointer(skb, offset + sizeof(sctp_chunkhdr_t),
|
|
sizeof(_inithdr), &_inithdr);
|
|
if (ih == NULL)
|
|
goto out_unlock;
|
|
pr_debug("Setting vtag %x for dir %d\n",
|
|
ih->init_tag, !dir);
|
|
ct->proto.sctp.vtag[!dir] = ih->init_tag;
|
|
}
|
|
|
|
ct->proto.sctp.state = new_state;
|
|
if (old_state != new_state)
|
|
nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
|
|
}
|
|
spin_unlock_bh(&ct->lock);
|
|
|
|
nf_ct_refresh_acct(ct, ctinfo, skb, timeouts[new_state]);
|
|
|
|
if (old_state == SCTP_CONNTRACK_COOKIE_ECHOED &&
|
|
dir == IP_CT_DIR_REPLY &&
|
|
new_state == SCTP_CONNTRACK_ESTABLISHED) {
|
|
pr_debug("Setting assured bit\n");
|
|
set_bit(IPS_ASSURED_BIT, &ct->status);
|
|
nf_conntrack_event_cache(IPCT_ASSURED, ct);
|
|
}
|
|
|
|
return NF_ACCEPT;
|
|
|
|
out_unlock:
|
|
spin_unlock_bh(&ct->lock);
|
|
out:
|
|
return -NF_ACCEPT;
|
|
}
|
|
|
|
/* Called when a new connection for this protocol found. */
|
|
static bool sctp_new(struct nf_conn *ct, const struct sk_buff *skb,
|
|
unsigned int dataoff, unsigned int *timeouts)
|
|
{
|
|
enum sctp_conntrack new_state;
|
|
const struct sctphdr *sh;
|
|
struct sctphdr _sctph;
|
|
const struct sctp_chunkhdr *sch;
|
|
struct sctp_chunkhdr _sch;
|
|
u_int32_t offset, count;
|
|
unsigned long map[256 / sizeof(unsigned long)] = { 0 };
|
|
|
|
sh = skb_header_pointer(skb, dataoff, sizeof(_sctph), &_sctph);
|
|
if (sh == NULL)
|
|
return false;
|
|
|
|
if (do_basic_checks(ct, skb, dataoff, map) != 0)
|
|
return false;
|
|
|
|
/* If an OOTB packet has any of these chunks discard (Sec 8.4) */
|
|
if (test_bit(SCTP_CID_ABORT, map) ||
|
|
test_bit(SCTP_CID_SHUTDOWN_COMPLETE, map) ||
|
|
test_bit(SCTP_CID_COOKIE_ACK, map))
|
|
return false;
|
|
|
|
memset(&ct->proto.sctp, 0, sizeof(ct->proto.sctp));
|
|
new_state = SCTP_CONNTRACK_MAX;
|
|
for_each_sctp_chunk (skb, sch, _sch, offset, dataoff, count) {
|
|
/* Don't need lock here: this conntrack not in circulation yet */
|
|
new_state = sctp_new_state(IP_CT_DIR_ORIGINAL,
|
|
SCTP_CONNTRACK_NONE, sch->type);
|
|
|
|
/* Invalid: delete conntrack */
|
|
if (new_state == SCTP_CONNTRACK_NONE ||
|
|
new_state == SCTP_CONNTRACK_MAX) {
|
|
pr_debug("nf_conntrack_sctp: invalid new deleting.\n");
|
|
return false;
|
|
}
|
|
|
|
/* 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 false;
|
|
|
|
pr_debug("Setting vtag %x for new conn\n",
|
|
ih->init_tag);
|
|
|
|
ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
|
|
ih->init_tag;
|
|
} else {
|
|
/* Sec 8.5.1 (A) */
|
|
return false;
|
|
}
|
|
} else if (sch->type == SCTP_CID_HEARTBEAT) {
|
|
pr_debug("Setting vtag %x for secondary conntrack\n",
|
|
sh->vtag);
|
|
ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] = sh->vtag;
|
|
}
|
|
/* If it is a shutdown ack OOTB packet, we expect a return
|
|
shutdown complete, otherwise an ABORT Sec 8.4 (5) and (8) */
|
|
else {
|
|
pr_debug("Setting vtag %x for new conn OOTB\n",
|
|
sh->vtag);
|
|
ct->proto.sctp.vtag[IP_CT_DIR_REPLY] = sh->vtag;
|
|
}
|
|
|
|
ct->proto.sctp.state = new_state;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
|
|
|
|
#include <linux/netfilter/nfnetlink.h>
|
|
#include <linux/netfilter/nfnetlink_conntrack.h>
|
|
|
|
static int sctp_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_SCTP | NLA_F_NESTED);
|
|
if (!nest_parms)
|
|
goto nla_put_failure;
|
|
|
|
if (nla_put_u8(skb, CTA_PROTOINFO_SCTP_STATE, ct->proto.sctp.state) ||
|
|
nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_ORIGINAL,
|
|
ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL]) ||
|
|
nla_put_be32(skb, CTA_PROTOINFO_SCTP_VTAG_REPLY,
|
|
ct->proto.sctp.vtag[IP_CT_DIR_REPLY]))
|
|
goto nla_put_failure;
|
|
|
|
spin_unlock_bh(&ct->lock);
|
|
|
|
nla_nest_end(skb, nest_parms);
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
spin_unlock_bh(&ct->lock);
|
|
return -1;
|
|
}
|
|
|
|
static const struct nla_policy sctp_nla_policy[CTA_PROTOINFO_SCTP_MAX+1] = {
|
|
[CTA_PROTOINFO_SCTP_STATE] = { .type = NLA_U8 },
|
|
[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] = { .type = NLA_U32 },
|
|
[CTA_PROTOINFO_SCTP_VTAG_REPLY] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int nlattr_to_sctp(struct nlattr *cda[], struct nf_conn *ct)
|
|
{
|
|
struct nlattr *attr = cda[CTA_PROTOINFO_SCTP];
|
|
struct nlattr *tb[CTA_PROTOINFO_SCTP_MAX+1];
|
|
int err;
|
|
|
|
/* updates may not contain the internal protocol info, skip parsing */
|
|
if (!attr)
|
|
return 0;
|
|
|
|
err = nla_parse_nested(tb,
|
|
CTA_PROTOINFO_SCTP_MAX,
|
|
attr,
|
|
sctp_nla_policy);
|
|
if (err < 0)
|
|
return err;
|
|
|
|
if (!tb[CTA_PROTOINFO_SCTP_STATE] ||
|
|
!tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL] ||
|
|
!tb[CTA_PROTOINFO_SCTP_VTAG_REPLY])
|
|
return -EINVAL;
|
|
|
|
spin_lock_bh(&ct->lock);
|
|
ct->proto.sctp.state = nla_get_u8(tb[CTA_PROTOINFO_SCTP_STATE]);
|
|
ct->proto.sctp.vtag[IP_CT_DIR_ORIGINAL] =
|
|
nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_ORIGINAL]);
|
|
ct->proto.sctp.vtag[IP_CT_DIR_REPLY] =
|
|
nla_get_be32(tb[CTA_PROTOINFO_SCTP_VTAG_REPLY]);
|
|
spin_unlock_bh(&ct->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sctp_nlattr_size(void)
|
|
{
|
|
return nla_total_size(0) /* CTA_PROTOINFO_SCTP */
|
|
+ nla_policy_len(sctp_nla_policy, CTA_PROTOINFO_SCTP_MAX + 1);
|
|
}
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
|
|
|
|
#include <linux/netfilter/nfnetlink.h>
|
|
#include <linux/netfilter/nfnetlink_cttimeout.h>
|
|
|
|
static int sctp_timeout_nlattr_to_obj(struct nlattr *tb[],
|
|
struct net *net, void *data)
|
|
{
|
|
unsigned int *timeouts = data;
|
|
struct nf_sctp_net *sn = sctp_pernet(net);
|
|
int i;
|
|
|
|
/* set default SCTP timeouts. */
|
|
for (i=0; i<SCTP_CONNTRACK_MAX; i++)
|
|
timeouts[i] = sn->timeouts[i];
|
|
|
|
/* there's a 1:1 mapping between attributes and protocol states. */
|
|
for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_MAX+1; i++) {
|
|
if (tb[i]) {
|
|
timeouts[i] = ntohl(nla_get_be32(tb[i])) * HZ;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sctp_timeout_obj_to_nlattr(struct sk_buff *skb, const void *data)
|
|
{
|
|
const unsigned int *timeouts = data;
|
|
int i;
|
|
|
|
for (i=CTA_TIMEOUT_SCTP_UNSPEC+1; i<CTA_TIMEOUT_SCTP_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
|
|
sctp_timeout_nla_policy[CTA_TIMEOUT_SCTP_MAX+1] = {
|
|
[CTA_TIMEOUT_SCTP_CLOSED] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_SCTP_COOKIE_WAIT] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_SCTP_COOKIE_ECHOED] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_SCTP_ESTABLISHED] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_SCTP_SHUTDOWN_SENT] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_SCTP_SHUTDOWN_RECD] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_SCTP_SHUTDOWN_ACK_SENT] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_SCTP_HEARTBEAT_SENT] = { .type = NLA_U32 },
|
|
[CTA_TIMEOUT_SCTP_HEARTBEAT_ACKED] = { .type = NLA_U32 },
|
|
};
|
|
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
|
|
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static struct ctl_table sctp_sysctl_table[] = {
|
|
{
|
|
.procname = "nf_conntrack_sctp_timeout_closed",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_sctp_timeout_cookie_wait",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_sctp_timeout_cookie_echoed",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_sctp_timeout_established",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_sctp_timeout_shutdown_sent",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_sctp_timeout_shutdown_recd",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_sctp_timeout_shutdown_ack_sent",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_sctp_timeout_heartbeat_sent",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{
|
|
.procname = "nf_conntrack_sctp_timeout_heartbeat_acked",
|
|
.maxlen = sizeof(unsigned int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec_jiffies,
|
|
},
|
|
{ }
|
|
};
|
|
#endif
|
|
|
|
static int sctp_kmemdup_sysctl_table(struct nf_proto_net *pn,
|
|
struct nf_sctp_net *sn)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
if (pn->ctl_table)
|
|
return 0;
|
|
|
|
pn->ctl_table = kmemdup(sctp_sysctl_table,
|
|
sizeof(sctp_sysctl_table),
|
|
GFP_KERNEL);
|
|
if (!pn->ctl_table)
|
|
return -ENOMEM;
|
|
|
|
pn->ctl_table[0].data = &sn->timeouts[SCTP_CONNTRACK_CLOSED];
|
|
pn->ctl_table[1].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_WAIT];
|
|
pn->ctl_table[2].data = &sn->timeouts[SCTP_CONNTRACK_COOKIE_ECHOED];
|
|
pn->ctl_table[3].data = &sn->timeouts[SCTP_CONNTRACK_ESTABLISHED];
|
|
pn->ctl_table[4].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_SENT];
|
|
pn->ctl_table[5].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_RECD];
|
|
pn->ctl_table[6].data = &sn->timeouts[SCTP_CONNTRACK_SHUTDOWN_ACK_SENT];
|
|
pn->ctl_table[7].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_SENT];
|
|
pn->ctl_table[8].data = &sn->timeouts[SCTP_CONNTRACK_HEARTBEAT_ACKED];
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
static int sctp_init_net(struct net *net, u_int16_t proto)
|
|
{
|
|
struct nf_sctp_net *sn = sctp_pernet(net);
|
|
struct nf_proto_net *pn = &sn->pn;
|
|
|
|
if (!pn->users) {
|
|
int i;
|
|
|
|
for (i = 0; i < SCTP_CONNTRACK_MAX; i++)
|
|
sn->timeouts[i] = sctp_timeouts[i];
|
|
}
|
|
|
|
return sctp_kmemdup_sysctl_table(pn, sn);
|
|
}
|
|
|
|
struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp4 __read_mostly = {
|
|
.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,
|
|
.get_timeouts = sctp_get_timeouts,
|
|
.new = sctp_new,
|
|
.me = THIS_MODULE,
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
|
|
.to_nlattr = sctp_to_nlattr,
|
|
.nlattr_size = sctp_nlattr_size,
|
|
.from_nlattr = nlattr_to_sctp,
|
|
.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 = sctp_timeout_nlattr_to_obj,
|
|
.obj_to_nlattr = sctp_timeout_obj_to_nlattr,
|
|
.nlattr_max = CTA_TIMEOUT_SCTP_MAX,
|
|
.obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
|
|
.nla_policy = sctp_timeout_nla_policy,
|
|
},
|
|
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
|
|
.init_net = sctp_init_net,
|
|
};
|
|
EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_sctp4);
|
|
|
|
struct nf_conntrack_l4proto nf_conntrack_l4proto_sctp6 __read_mostly = {
|
|
.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,
|
|
.get_timeouts = sctp_get_timeouts,
|
|
.new = sctp_new,
|
|
.me = THIS_MODULE,
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK)
|
|
.to_nlattr = sctp_to_nlattr,
|
|
.nlattr_size = sctp_nlattr_size,
|
|
.from_nlattr = nlattr_to_sctp,
|
|
.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,
|
|
#if IS_ENABLED(CONFIG_NF_CT_NETLINK_TIMEOUT)
|
|
.ctnl_timeout = {
|
|
.nlattr_to_obj = sctp_timeout_nlattr_to_obj,
|
|
.obj_to_nlattr = sctp_timeout_obj_to_nlattr,
|
|
.nlattr_max = CTA_TIMEOUT_SCTP_MAX,
|
|
.obj_size = sizeof(unsigned int) * SCTP_CONNTRACK_MAX,
|
|
.nla_policy = sctp_timeout_nla_policy,
|
|
},
|
|
#endif /* CONFIG_NF_CT_NETLINK_TIMEOUT */
|
|
#endif
|
|
.init_net = sctp_init_net,
|
|
};
|
|
EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_sctp6);
|