2019-05-27 06:55:01 +00:00
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// SPDX-License-Identifier: GPL-2.0-or-later
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2006-12-03 06:09:06 +00:00
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/* IRC extension for IP connection tracking, Version 1.21
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* (C) 2000-2002 by Harald Welte <laforge@gnumonks.org>
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* based on RR's ip_conntrack_ftp.c
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2013-04-06 13:24:29 +00:00
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* (C) 2006-2012 Patrick McHardy <kaber@trash.net>
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2006-12-03 06:09:06 +00:00
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*/
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2016-01-03 21:41:24 +00:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2006-12-03 06:09:06 +00:00
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/skbuff.h>
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#include <linux/in.h>
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2007-07-08 05:39:38 +00:00
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#include <linux/ip.h>
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2006-12-03 06:09:06 +00:00
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#include <linux/tcp.h>
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#include <linux/netfilter.h>
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include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 08:04:11 +00:00
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#include <linux/slab.h>
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2006-12-03 06:09:06 +00:00
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_expect.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <linux/netfilter/nf_conntrack_irc.h>
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#define MAX_PORTS 8
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static unsigned short ports[MAX_PORTS];
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2008-01-31 12:08:10 +00:00
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static unsigned int ports_c;
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2006-12-03 06:09:06 +00:00
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static unsigned int max_dcc_channels = 8;
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static unsigned int dcc_timeout __read_mostly = 300;
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/* This is slow, but it's simple. --RR */
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static char *irc_buffer;
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static DEFINE_SPINLOCK(irc_buffer_lock);
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2007-10-15 07:53:15 +00:00
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unsigned int (*nf_nat_irc_hook)(struct sk_buff *skb,
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2006-12-03 06:09:06 +00:00
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enum ip_conntrack_info ctinfo,
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2012-08-26 17:14:04 +00:00
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unsigned int protoff,
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2006-12-03 06:09:06 +00:00
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unsigned int matchoff,
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unsigned int matchlen,
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struct nf_conntrack_expect *exp) __read_mostly;
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EXPORT_SYMBOL_GPL(nf_nat_irc_hook);
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2019-04-17 14:46:15 +00:00
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#define HELPER_NAME "irc"
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2006-12-03 06:09:06 +00:00
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MODULE_AUTHOR("Harald Welte <laforge@netfilter.org>");
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MODULE_DESCRIPTION("IRC (DCC) connection tracking helper");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("ip_conntrack_irc");
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2019-04-17 14:46:15 +00:00
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MODULE_ALIAS_NFCT_HELPER(HELPER_NAME);
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2006-12-03 06:09:06 +00:00
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module_param_array(ports, ushort, &ports_c, 0400);
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MODULE_PARM_DESC(ports, "port numbers of IRC servers");
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module_param(max_dcc_channels, uint, 0400);
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MODULE_PARM_DESC(max_dcc_channels, "max number of expected DCC channels per "
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"IRC session");
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module_param(dcc_timeout, uint, 0400);
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MODULE_PARM_DESC(dcc_timeout, "timeout on for unestablished DCC channels");
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2008-04-14 09:15:42 +00:00
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static const char *const dccprotos[] = {
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2006-12-03 06:09:06 +00:00
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"SEND ", "CHAT ", "MOVE ", "TSEND ", "SCHAT "
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};
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#define MINMATCHLEN 5
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/* tries to get the ip_addr and port out of a dcc command
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* return value: -1 on failure, 0 on success
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* data pointer to first byte of DCC command data
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* data_end pointer to last byte of dcc command data
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* ip returns parsed ip of dcc command
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* port returns parsed port of dcc command
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* ad_beg_p returns pointer to first byte of addr data
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* ad_end_p returns pointer to last byte of addr data
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*/
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2009-03-28 15:38:30 +00:00
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static int parse_dcc(char *data, const char *data_end, __be32 *ip,
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2006-12-03 06:09:06 +00:00
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u_int16_t *port, char **ad_beg_p, char **ad_end_p)
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{
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2008-09-08 01:21:24 +00:00
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char *tmp;
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2006-12-03 06:09:06 +00:00
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/* at least 12: "AAAAAAAA P\1\n" */
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while (*data++ != ' ')
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if (data > data_end - 12)
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return -1;
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2008-09-08 01:21:24 +00:00
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/* Make sure we have a newline character within the packet boundaries
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* because simple_strtoul parses until the first invalid character. */
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for (tmp = data; tmp <= data_end; tmp++)
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if (*tmp == '\n')
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break;
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if (tmp > data_end || *tmp != '\n')
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return -1;
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2006-12-03 06:09:06 +00:00
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*ad_beg_p = data;
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2009-03-28 15:38:30 +00:00
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*ip = cpu_to_be32(simple_strtoul(data, &data, 10));
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2006-12-03 06:09:06 +00:00
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/* skip blanks between ip and port */
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while (*data == ' ') {
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if (data >= data_end)
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return -1;
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data++;
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}
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*port = simple_strtoul(data, &data, 10);
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*ad_end_p = data;
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return 0;
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}
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2007-10-15 07:53:15 +00:00
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static int help(struct sk_buff *skb, unsigned int protoff,
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2006-12-03 06:09:06 +00:00
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struct nf_conn *ct, enum ip_conntrack_info ctinfo)
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{
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unsigned int dataoff;
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2008-04-14 09:15:42 +00:00
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const struct iphdr *iph;
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const struct tcphdr *th;
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struct tcphdr _tcph;
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const char *data_limit;
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char *data, *ib_ptr;
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2006-12-03 06:09:06 +00:00
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int dir = CTINFO2DIR(ctinfo);
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struct nf_conntrack_expect *exp;
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struct nf_conntrack_tuple *tuple;
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2009-03-28 15:38:30 +00:00
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__be32 dcc_ip;
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2006-12-03 06:09:06 +00:00
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u_int16_t dcc_port;
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__be16 port;
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int i, ret = NF_ACCEPT;
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char *addr_beg_p, *addr_end_p;
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typeof(nf_nat_irc_hook) nf_nat_irc;
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/* If packet is coming from IRC server */
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if (dir == IP_CT_DIR_REPLY)
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return NF_ACCEPT;
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/* Until there's been traffic both ways, don't look in packets. */
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2011-05-19 13:44:27 +00:00
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if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
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2006-12-03 06:09:06 +00:00
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return NF_ACCEPT;
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/* Not a full tcp header? */
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2007-10-15 07:53:15 +00:00
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th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
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2006-12-03 06:09:06 +00:00
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if (th == NULL)
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return NF_ACCEPT;
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/* No data? */
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dataoff = protoff + th->doff*4;
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2007-10-15 07:53:15 +00:00
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if (dataoff >= skb->len)
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2006-12-03 06:09:06 +00:00
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return NF_ACCEPT;
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spin_lock_bh(&irc_buffer_lock);
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2007-10-15 07:53:15 +00:00
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ib_ptr = skb_header_pointer(skb, dataoff, skb->len - dataoff,
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2006-12-03 06:09:06 +00:00
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irc_buffer);
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BUG_ON(ib_ptr == NULL);
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data = ib_ptr;
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2007-10-15 07:53:15 +00:00
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data_limit = ib_ptr + skb->len - dataoff;
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2006-12-03 06:09:06 +00:00
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2022-08-26 04:56:57 +00:00
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/* Skip any whitespace */
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while (data < data_limit - 10) {
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if (*data == ' ' || *data == '\r' || *data == '\n')
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data++;
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else
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break;
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}
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/* strlen("PRIVMSG x ")=10 */
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if (data < data_limit - 10) {
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if (strncasecmp("PRIVMSG ", data, 8))
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goto out;
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data += 8;
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}
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/* strlen(" :\1DCC SENT t AAAAAAAA P\1\n")=26
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* 7+MINMATCHLEN+strlen("t AAAAAAAA P\1\n")=26
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*/
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while (data < data_limit - (21 + MINMATCHLEN)) {
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/* Find first " :", the start of message */
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if (memcmp(data, " :", 2)) {
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2006-12-03 06:09:06 +00:00
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data++;
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continue;
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}
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2022-08-26 04:56:57 +00:00
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data += 2;
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/* then check that place only for the DCC command */
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if (memcmp(data, "\1DCC ", 5))
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goto out;
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2006-12-03 06:09:06 +00:00
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data += 5;
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2022-08-26 04:56:57 +00:00
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/* we have at least (21+MINMATCHLEN)-(2+5) bytes valid data left */
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2006-12-03 06:09:06 +00:00
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2007-10-15 07:53:15 +00:00
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iph = ip_hdr(skb);
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2008-10-31 07:54:29 +00:00
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pr_debug("DCC found in master %pI4:%u %pI4:%u\n",
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&iph->saddr, ntohs(th->source),
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&iph->daddr, ntohs(th->dest));
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2006-12-03 06:09:06 +00:00
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for (i = 0; i < ARRAY_SIZE(dccprotos); i++) {
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if (memcmp(data, dccprotos[i], strlen(dccprotos[i]))) {
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/* no match */
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continue;
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}
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data += strlen(dccprotos[i]);
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2007-07-08 05:39:38 +00:00
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pr_debug("DCC %s detected\n", dccprotos[i]);
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2006-12-03 06:09:06 +00:00
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/* we have at least
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2022-08-26 04:56:57 +00:00
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* (21+MINMATCHLEN)-7-dccprotos[i].matchlen bytes valid
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2006-12-03 06:09:06 +00:00
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* data left (== 14/13 bytes) */
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2008-04-14 09:15:42 +00:00
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if (parse_dcc(data, data_limit, &dcc_ip,
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2006-12-03 06:09:06 +00:00
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&dcc_port, &addr_beg_p, &addr_end_p)) {
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2007-07-08 05:39:38 +00:00
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pr_debug("unable to parse dcc command\n");
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2006-12-03 06:09:06 +00:00
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continue;
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}
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2009-03-28 15:38:30 +00:00
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pr_debug("DCC bound ip/port: %pI4:%u\n",
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&dcc_ip, dcc_port);
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2006-12-03 06:09:06 +00:00
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/* dcc_ip can be the internal OR external (NAT'ed) IP */
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tuple = &ct->tuplehash[dir].tuple;
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2022-08-26 04:56:58 +00:00
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if ((tuple->src.u3.ip != dcc_ip &&
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ct->tuplehash[!dir].tuple.dst.u3.ip != dcc_ip) ||
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dcc_port == 0) {
|
2012-05-13 21:56:26 +00:00
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net_warn_ratelimited("Forged DCC command from %pI4: %pI4:%u\n",
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&tuple->src.u3.ip,
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&dcc_ip, dcc_port);
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2006-12-03 06:09:06 +00:00
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continue;
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}
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2007-07-08 05:30:49 +00:00
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exp = nf_ct_expect_alloc(ct);
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2006-12-03 06:09:06 +00:00
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if (exp == NULL) {
|
2013-02-10 17:56:56 +00:00
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nf_ct_helper_log(skb, ct,
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"cannot alloc expectation");
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2006-12-03 06:09:06 +00:00
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ret = NF_DROP;
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goto out;
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}
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tuple = &ct->tuplehash[!dir].tuple;
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port = htons(dcc_port);
|
2008-03-26 03:09:15 +00:00
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nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT,
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tuple->src.l3num,
|
2007-07-08 05:30:49 +00:00
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NULL, &tuple->dst.u3,
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IPPROTO_TCP, NULL, &port);
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2006-12-03 06:09:06 +00:00
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nf_nat_irc = rcu_dereference(nf_nat_irc_hook);
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2012-08-26 17:14:27 +00:00
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if (nf_nat_irc && ct->status & IPS_NAT_MASK)
|
2012-08-26 17:14:04 +00:00
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ret = nf_nat_irc(skb, ctinfo, protoff,
|
2006-12-03 06:09:06 +00:00
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addr_beg_p - ib_ptr,
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addr_end_p - addr_beg_p,
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exp);
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netfilter: nf_conntrack_sip: fix expectation clash
When conntracks change during a dialog, SDP messages may be sent from
different conntracks to establish expects with identical tuples. In this
case expects conflict may be detected for the 2nd SDP message and end up
with a process failure.
The fixing here is to reuse an existing expect who has the same tuple for a
different conntrack if any.
Here are two scenarios for the case.
1)
SERVER CPE
| INVITE SDP |
5060 |<----------------------|5060
| 100 Trying |
5060 |---------------------->|5060
| 183 SDP |
5060 |---------------------->|5060 ===> Conntrack 1
| PRACK |
50601 |<----------------------|5060
| 200 OK (PRACK) |
50601 |---------------------->|5060
| 200 OK (INVITE) |
5060 |---------------------->|5060
| ACK |
50601 |<----------------------|5060
| |
|<--- RTP stream ------>|
| |
| INVITE SDP (t38) |
50601 |---------------------->|5060 ===> Conntrack 2
With a certain configuration in the CPE, SIP messages "183 with SDP" and
"re-INVITE with SDP t38" will go through the sip helper to create
expects for RTP and RTCP.
It is okay to create RTP and RTCP expects for "183", whose master
connection source port is 5060, and destination port is 5060.
In the "183" message, port in Contact header changes to 50601 (from the
original 5060). So the following requests e.g. PRACK and ACK are sent to
port 50601. It is a different conntrack (let call Conntrack 2) from the
original INVITE (let call Conntrack 1) due to the port difference.
In this example, after the call is established, there is RTP stream but no
RTCP stream for Conntrack 1, so the RTP expect created upon "183" is
cleared, and RTCP expect created for Conntrack 1 retains.
When "re-INVITE with SDP t38" arrives to create RTP&RTCP expects, current
ALG implementation will call nf_ct_expect_related() for RTP and RTCP. The
expects tuples are identical to those for Conntrack 1. RTP expect for
Conntrack 2 succeeds in creation as the one for Conntrack 1 has been
removed. RTCP expect for Conntrack 2 fails in creation because it has
idential tuples and 'conflict' with the one retained for Conntrack 1. And
then result in a failure in processing of the re-INVITE.
2)
SERVER A CPE
| REGISTER |
5060 |<------------------| 5060 ==> CT1
| 200 |
5060 |------------------>| 5060
| |
| INVITE SDP(1) |
5060 |<------------------| 5060
| 300(multi choice) |
5060 |------------------>| 5060 SERVER B
| ACK |
5060 |<------------------| 5060
| INVITE SDP(2) |
5060 |-------------------->| 5060 ==> CT2
| 100 |
5060 |<--------------------| 5060
| 200(contact changes)|
5060 |<--------------------| 5060
| ACK |
5060 |-------------------->| 50601 ==> CT3
| |
|<--- RTP stream ---->|
| |
| BYE |
5060 |<--------------------| 50601
| 200 |
5060 |-------------------->| 50601
| INVITE SDP(3) |
5060 |<------------------| 5060 ==> CT1
CPE sends an INVITE request(1) to Server A, and creates a RTP&RTCP expect
pair for this Conntrack 1 (CT1). Server A responds 300 to redirect to
Server B. The RTP&RTCP expect pairs created on CT1 are removed upon 300
response.
CPE sends the INVITE request(2) to Server B, and creates an expect pair
for the new conntrack (due to destination address difference), let call
CT2. Server B changes the port to 50601 in 200 OK response, and the
following requests ACK and BYE from CPE are sent to 50601. The call is
established. There is RTP stream and no RTCP stream. So RTP expect is
removed and RTCP expect for CT2 retains.
As BYE request is sent from port 50601, it is another conntrack, let call
CT3, different from CT2 due to the port difference. So the BYE request will
not remove the RTCP expect for CT2.
Then another outgoing call is made, with the same RTP port being used (not
definitely but possibly). CPE firstly sends the INVITE request(3) to Server
A, and tries to create a RTP&RTCP expect pairs for this CT1. In current ALG
implementation, the RTCP expect for CT1 fails in creation because it
'conflicts' with the residual one for CT2. As a result the INVITE request
fails to send.
Signed-off-by: xiao ruizhu <katrina.xiaorz@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2019-07-04 03:31:13 +00:00
|
|
|
else if (nf_ct_expect_related(exp, 0) != 0) {
|
2013-02-10 17:56:56 +00:00
|
|
|
nf_ct_helper_log(skb, ct,
|
|
|
|
"cannot add expectation");
|
2006-12-03 06:09:06 +00:00
|
|
|
ret = NF_DROP;
|
2013-02-10 17:56:56 +00:00
|
|
|
}
|
2007-07-08 05:30:49 +00:00
|
|
|
nf_ct_expect_put(exp);
|
2006-12-03 06:09:06 +00:00
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
out:
|
|
|
|
spin_unlock_bh(&irc_buffer_lock);
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct nf_conntrack_helper irc[MAX_PORTS] __read_mostly;
|
2008-03-26 03:09:15 +00:00
|
|
|
static struct nf_conntrack_expect_policy irc_exp_policy;
|
2006-12-03 06:09:06 +00:00
|
|
|
|
|
|
|
static int __init nf_conntrack_irc_init(void)
|
|
|
|
{
|
|
|
|
int i, ret;
|
|
|
|
|
|
|
|
if (max_dcc_channels < 1) {
|
2016-01-03 21:41:24 +00:00
|
|
|
pr_err("max_dcc_channels must not be zero\n");
|
2006-12-03 06:09:06 +00:00
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2017-03-24 13:32:19 +00:00
|
|
|
if (max_dcc_channels > NF_CT_EXPECT_MAX_CNT) {
|
|
|
|
pr_err("max_dcc_channels must not be more than %u\n",
|
|
|
|
NF_CT_EXPECT_MAX_CNT);
|
|
|
|
return -EINVAL;
|
|
|
|
}
|
|
|
|
|
2008-03-26 03:09:15 +00:00
|
|
|
irc_exp_policy.max_expected = max_dcc_channels;
|
|
|
|
irc_exp_policy.timeout = dcc_timeout;
|
|
|
|
|
2006-12-03 06:09:06 +00:00
|
|
|
irc_buffer = kmalloc(65536, GFP_KERNEL);
|
|
|
|
if (!irc_buffer)
|
|
|
|
return -ENOMEM;
|
|
|
|
|
|
|
|
/* If no port given, default to standard irc port */
|
|
|
|
if (ports_c == 0)
|
|
|
|
ports[ports_c++] = IRC_PORT;
|
|
|
|
|
|
|
|
for (i = 0; i < ports_c; i++) {
|
2019-04-17 14:46:15 +00:00
|
|
|
nf_ct_helper_init(&irc[i], AF_INET, IPPROTO_TCP, HELPER_NAME,
|
2016-07-18 03:39:23 +00:00
|
|
|
IRC_PORT, ports[i], i, &irc_exp_policy,
|
2017-04-15 23:29:17 +00:00
|
|
|
0, help, NULL, THIS_MODULE);
|
2016-07-18 03:39:23 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
ret = nf_conntrack_helpers_register(&irc[0], ports_c);
|
|
|
|
if (ret) {
|
|
|
|
pr_err("failed to register helpers\n");
|
|
|
|
kfree(irc_buffer);
|
|
|
|
return ret;
|
2006-12-03 06:09:06 +00:00
|
|
|
}
|
2016-07-18 03:39:23 +00:00
|
|
|
|
2006-12-03 06:09:06 +00:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2018-04-08 14:59:34 +00:00
|
|
|
static void __exit nf_conntrack_irc_fini(void)
|
2006-12-03 06:09:06 +00:00
|
|
|
{
|
2016-07-18 03:39:23 +00:00
|
|
|
nf_conntrack_helpers_unregister(irc, ports_c);
|
2006-12-03 06:09:06 +00:00
|
|
|
kfree(irc_buffer);
|
|
|
|
}
|
|
|
|
|
|
|
|
module_init(nf_conntrack_irc_init);
|
|
|
|
module_exit(nf_conntrack_irc_fini);
|