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Merge branch 'master' of git://1984.lsi.us.es/nf-next 

Pablo Neira Ayuso says:

====================
The following patchset contain updates for your net-next tree, they are:

* Fix (for just added) connlabel dependencies, from Florian Westphal.

* Add aliasing support for conntrack, thus users can either use -m state
  or -m conntrack from iptables while using the same kernel module, from
  Jozsef Kadlecsik.

* Some code refactoring for the CT target to merge common code in
  revision 0 and 1, from myself.

* Add aliasing support for CT, based on patch from Jozsef Kadlecsik.

* Add one mutex per nfnetlink subsystem, from myself.

* Improved logging for packets that are dropped by helpers, from myself.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2013-02-18 23:42:09 -05:00
parent 6338a53a2b b20ab9cc63
commit 2ccba5433b
25 changed files with 310 additions and 200 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/linux/netfilter/nfnetlink.h
View File

@ -34,8 +34,8 @@ extern int nfnetlink_send(struct sk_buff *skb, struct net *net, u32 pid, unsigne
extern int nfnetlink_set_err(struct net *net, u32 pid, u32 group, int error);
extern int nfnetlink_unicast(struct sk_buff *skb, struct net *net, u_int32_t pid, int flags);
extern void nfnl_lock(void);
extern void nfnl_unlock(void);
extern void nfnl_lock(__u8 subsys_id);
extern void nfnl_unlock(__u8 subsys_id);
#define MODULE_ALIAS_NFNL_SUBSYS(subsys) \
MODULE_ALIAS("nfnetlink-subsys-" __stringify(subsys))

4
include/net/netfilter/nf_conntrack_helper.h
View File

@ -100,6 +100,10 @@ struct nf_ct_helper_expectfn {
void (*expectfn)(struct nf_conn *ct, struct nf_conntrack_expect *exp);
};
__printf(3,4)
void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct,
const char *fmt, ...);
void nf_ct_helper_expectfn_register(struct nf_ct_helper_expectfn *n);
void nf_ct_helper_expectfn_unregister(struct nf_ct_helper_expectfn *n);
struct nf_ct_helper_expectfn *

6
include/uapi/linux/netfilter/xt_CT.h
View File

@ -3,7 +3,11 @@
#include <linux/types.h>
#define XT_CT_NOTRACK 0x1
enum {
XT_CT_NOTRACK = 1 << 0,
XT_CT_NOTRACK_ALIAS = 1 << 1,
XT_CT_MASK = XT_CT_NOTRACK | XT_CT_NOTRACK_ALIAS,
};
struct xt_ct_target_info {
__u16 flags;

1
include/uapi/linux/netfilter/xt_conntrack.h
View File

@ -31,6 +31,7 @@ enum {
XT_CONNTRACK_REPLSRC_PORT = 1 << 10,
XT_CONNTRACK_REPLDST_PORT = 1 << 11,
XT_CONNTRACK_DIRECTION = 1 << 12,
XT_CONNTRACK_STATE_ALIAS = 1 << 13,
};
struct xt_conntrack_mtinfo1 {

10
net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
View File

@ -100,7 +100,6 @@ static unsigned int ipv4_helper(unsigned int hooknum,
enum ip_conntrack_info ctinfo;
const struct nf_conn_help *help;
const struct nf_conntrack_helper *helper;
unsigned int ret;
/* This is where we call the helper: as the packet goes out. */
ct = nf_ct_get(skb, &ctinfo);
@ -116,13 +115,8 @@ static unsigned int ipv4_helper(unsigned int hooknum,
if (!helper)
return NF_ACCEPT;
ret = helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb),
ct, ctinfo);
if (ret != NF_ACCEPT && (ret & NF_VERDICT_MASK) != NF_QUEUE) {
nf_log_packet(NFPROTO_IPV4, hooknum, skb, in, out, NULL,
"nf_ct_%s: dropping packet", helper->name);
}
return ret;
return helper->help(skb, skb_network_offset(skb) + ip_hdrlen(skb),
ct, ctinfo);
}
static unsigned int ipv4_confirm(unsigned int hooknum,

8
net/ipv6/netfilter/nf_conntrack_l3proto_ipv6.c
View File

@ -104,7 +104,6 @@ static unsigned int ipv6_helper(unsigned int hooknum,
const struct nf_conn_help *help;
const struct nf_conntrack_helper *helper;
enum ip_conntrack_info ctinfo;
unsigned int ret;
__be16 frag_off;
int protoff;
u8 nexthdr;
@ -130,12 +129,7 @@ static unsigned int ipv6_helper(unsigned int hooknum,
return NF_ACCEPT;
}
ret = helper->help(skb, protoff, ct, ctinfo);
if (ret != NF_ACCEPT && (ret & NF_VERDICT_MASK) != NF_QUEUE) {
nf_log_packet(NFPROTO_IPV6, hooknum, skb, in, out, NULL,
"nf_ct_%s: dropping packet", helper->name);
}
return ret;
return helper->help(skb, protoff, ct, ctinfo);
}
static unsigned int ipv6_confirm(unsigned int hooknum,

1
net/netfilter/Kconfig
View File

@ -860,6 +860,7 @@ config NETFILTER_XT_MATCH_CONNBYTES
config NETFILTER_XT_MATCH_CONNLABEL
tristate '"connlabel" match support'
select NF_CONNTRACK_LABELS
depends on NF_CONNTRACK
depends on NETFILTER_ADVANCED
---help---
This match allows you to test and assign userspace-defined labels names

26
net/netfilter/ipset/ip_set_core.c
View File

@ -88,14 +88,14 @@ find_set_type(const char *name, u8 family, u8 revision)
static bool
load_settype(const char *name)
{
nfnl_unlock();
nfnl_unlock(NFNL_SUBSYS_IPSET);
pr_debug("try to load ip_set_%s\n", name);
if (request_module("ip_set_%s", name) < 0) {
pr_warning("Can't find ip_set type %s\n", name);
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_IPSET);
return false;
}
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_IPSET);
return true;
}
@ -532,7 +532,7 @@ ip_set_nfnl_get(const char *name)
ip_set_id_t i, index = IPSET_INVALID_ID;
struct ip_set *s;
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_IPSET);
for (i = 0; i < ip_set_max; i++) {
s = nfnl_set(i);
if (s != NULL && STREQ(s->name, name)) {
@ -541,7 +541,7 @@ ip_set_nfnl_get(const char *name)
break;
}
}
nfnl_unlock();
nfnl_unlock(NFNL_SUBSYS_IPSET);
return index;
}
@ -561,13 +561,13 @@ ip_set_nfnl_get_byindex(ip_set_id_t index)
if (index > ip_set_max)
return IPSET_INVALID_ID;
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_IPSET);
set = nfnl_set(index);
if (set)
__ip_set_get(set);
else
index = IPSET_INVALID_ID;
nfnl_unlock();
nfnl_unlock(NFNL_SUBSYS_IPSET);
return index;
}
@ -584,11 +584,11 @@ void
ip_set_nfnl_put(ip_set_id_t index)
{
struct ip_set *set;
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_IPSET);
set = nfnl_set(index);
if (set != NULL)
__ip_set_put(set);
nfnl_unlock();
nfnl_unlock(NFNL_SUBSYS_IPSET);
}
EXPORT_SYMBOL_GPL(ip_set_nfnl_put);
@ -1763,10 +1763,10 @@ ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
goto done;
}
req_get->set.name[IPSET_MAXNAMELEN - 1] = '\0';
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_IPSET);
find_set_and_id(req_get->set.name, &id);
req_get->set.index = id;
nfnl_unlock();
nfnl_unlock(NFNL_SUBSYS_IPSET);
goto copy;
}
case IP_SET_OP_GET_BYINDEX: {
@ -1778,11 +1778,11 @@ ip_set_sockfn_get(struct sock *sk, int optval, void __user *user, int *len)
ret = -EINVAL;
goto done;
}
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_IPSET);
set = nfnl_set(req_get->set.index);
strncpy(req_get->set.name, set ? set->name : "",
IPSET_MAXNAMELEN);
nfnl_unlock();
nfnl_unlock(NFNL_SUBSYS_IPSET);
goto copy;
}
default:

5
net/netfilter/nf_conntrack_amanda.c
View File

@ -145,6 +145,7 @@ static int amanda_help(struct sk_buff *skb,
exp = nf_ct_expect_alloc(ct);
if (exp == NULL) {
nf_ct_helper_log(skb, ct, "cannot alloc expectation");
ret = NF_DROP;
goto out;
}
@ -158,8 +159,10 @@ static int amanda_help(struct sk_buff *skb,
if (nf_nat_amanda && ct->status & IPS_NAT_MASK)
ret = nf_nat_amanda(skb, ctinfo, protoff,
off - dataoff, len, exp);
else if (nf_ct_expect_related(exp) != 0)
else if (nf_ct_expect_related(exp) != 0) {
nf_ct_helper_log(skb, ct, "cannot add expectation");
ret = NF_DROP;
}
nf_ct_expect_put(exp);
}

10
net/netfilter/nf_conntrack_ftp.c
View File

@ -435,8 +435,8 @@ skip_nl_seq:
connection tracking, not packet filtering.
However, it is necessary for accurate tracking in
this case. */
pr_debug("conntrack_ftp: partial %s %u+%u\n",
search[dir][i].pattern, ntohl(th->seq), datalen);
nf_ct_helper_log(skb, ct, "partial matching of `%s'",
search[dir][i].pattern);
ret = NF_DROP;
goto out;
} else if (found == 0) { /* No match */
@ -450,6 +450,7 @@ skip_nl_seq:
exp = nf_ct_expect_alloc(ct);
if (exp == NULL) {
nf_ct_helper_log(skb, ct, "cannot alloc expectation");
ret = NF_DROP;
goto out;
}
@ -500,9 +501,10 @@ skip_nl_seq:
protoff, matchoff, matchlen, exp);
else {
/* Can't expect this? Best to drop packet now. */
if (nf_ct_expect_related(exp) != 0)
if (nf_ct_expect_related(exp) != 0) {
nf_ct_helper_log(skb, ct, "cannot add expectation");
ret = NF_DROP;
else
} else
ret = NF_ACCEPT;
}

6
net/netfilter/nf_conntrack_h323_main.c
View File

@ -623,7 +623,7 @@ static int h245_help(struct sk_buff *skb, unsigned int protoff,
drop:
spin_unlock_bh(&nf_h323_lock);
net_info_ratelimited("nf_ct_h245: packet dropped\n");
nf_ct_helper_log(skb, ct, "cannot process H.245 message");
return NF_DROP;
}
@ -1197,7 +1197,7 @@ static int q931_help(struct sk_buff *skb, unsigned int protoff,
drop:
spin_unlock_bh(&nf_h323_lock);
net_info_ratelimited("nf_ct_q931: packet dropped\n");
nf_ct_helper_log(skb, ct, "cannot process Q.931 message");
return NF_DROP;
}
@ -1795,7 +1795,7 @@ static int ras_help(struct sk_buff *skb, unsigned int protoff,
drop:
spin_unlock_bh(&nf_h323_lock);
net_info_ratelimited("nf_ct_ras: packet dropped\n");
nf_ct_helper_log(skb, ct, "cannot process RAS message");
return NF_DROP;
}

19
net/netfilter/nf_conntrack_helper.c
View File

@ -28,6 +28,7 @@
#include <net/netfilter/nf_conntrack_helper.h>
#include <net/netfilter/nf_conntrack_core.h>
#include <net/netfilter/nf_conntrack_extend.h>
#include <net/netfilter/nf_log.h>
static DEFINE_MUTEX(nf_ct_helper_mutex);
struct hlist_head *nf_ct_helper_hash __read_mostly;
@ -334,6 +335,24 @@ nf_ct_helper_expectfn_find_by_symbol(const void *symbol)
}
EXPORT_SYMBOL_GPL(nf_ct_helper_expectfn_find_by_symbol);
__printf(3, 4)
void nf_ct_helper_log(struct sk_buff *skb, const struct nf_conn *ct,
const char *fmt, ...)
{
const struct nf_conn_help *help;
const struct nf_conntrack_helper *helper;
/* Called from the helper function, this call never fails */
help = nfct_help(ct);
/* rcu_read_lock()ed by nf_hook_slow */
helper = rcu_dereference(help->helper);
nf_log_packet(nf_ct_l3num(ct), 0, skb, NULL, NULL, NULL,
"nf_ct_%s: dropping packet: %s ", helper->name, fmt);
}
EXPORT_SYMBOL_GPL(nf_ct_helper_log);
int nf_conntrack_helper_register(struct nf_conntrack_helper *me)
{
int ret = 0;

7
net/netfilter/nf_conntrack_irc.c
View File

@ -194,6 +194,8 @@ static int help(struct sk_buff *skb, unsigned int protoff,
exp = nf_ct_expect_alloc(ct);
if (exp == NULL) {
nf_ct_helper_log(skb, ct,
"cannot alloc expectation");
ret = NF_DROP;
goto out;
}
@ -210,8 +212,11 @@ static int help(struct sk_buff *skb, unsigned int protoff,
addr_beg_p - ib_ptr,
addr_end_p - addr_beg_p,
exp);
else if (nf_ct_expect_related(exp) != 0)
else if (nf_ct_expect_related(exp) != 0) {
nf_ct_helper_log(skb, ct,
"cannot add expectation");
ret = NF_DROP;
}
nf_ct_expect_put(exp);
goto out;
}

12
net/netfilter/nf_conntrack_netlink.c
View File

@ -1256,13 +1256,13 @@ ctnetlink_parse_nat_setup(struct nf_conn *ct,
if (!parse_nat_setup) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
nfnl_unlock();
nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
if (request_module("nf-nat") < 0) {
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
return -EOPNOTSUPP;
}
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
if (nfnetlink_parse_nat_setup_hook)
return -EAGAIN;
@ -1274,13 +1274,13 @@ ctnetlink_parse_nat_setup(struct nf_conn *ct,
if (err == -EAGAIN) {
#ifdef CONFIG_MODULES
rcu_read_unlock();
nfnl_unlock();
nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
return -EOPNOTSUPP;
}
nfnl_lock();
nfnl_lock(NFNL_SUBSYS_CTNETLINK);
rcu_read_lock();
#else
err = -EOPNOTSUPP;

2
net/netfilter/nf_conntrack_pptp.c
View File

@ -14,7 +14,7 @@
* Limitations:
* - We blindly assume that control connections are always
* established in PNS->PAC direction. This is a violation
* of RFFC2673
* of RFC 2637
* - We can only support one single call within each session
* TODO:
* - testing of incoming PPTP calls

5
net/netfilter/nf_conntrack_sane.c
View File

@ -138,6 +138,7 @@ static int help(struct sk_buff *skb,
exp = nf_ct_expect_alloc(ct);
if (exp == NULL) {
nf_ct_helper_log(skb, ct, "cannot alloc expectation");
ret = NF_DROP;
goto out;
}
@ -151,8 +152,10 @@ static int help(struct sk_buff *skb,
nf_ct_dump_tuple(&exp->tuple);
/* Can't expect this? Best to drop packet now. */
if (nf_ct_expect_related(exp) != 0)
if (nf_ct_expect_related(exp) != 0) {
nf_ct_helper_log(skb, ct, "cannot add expectation");
ret = NF_DROP;
}
nf_ct_expect_put(exp);

73
net/netfilter/nf_conntrack_sip.c
View File

@ -1095,8 +1095,10 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
port = simple_strtoul(*dptr + mediaoff, NULL, 10);
if (port == 0)
continue;
if (port < 1024 || port > 65535)
if (port < 1024 || port > 65535) {
nf_ct_helper_log(skb, ct, "wrong port %u", port);
return NF_DROP;
}
/* The media description overrides the session description. */
maddr_len = 0;
@ -1107,15 +1109,20 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
memcpy(&rtp_addr, &maddr, sizeof(rtp_addr));
} else if (caddr_len)
memcpy(&rtp_addr, &caddr, sizeof(rtp_addr));
else
else {
nf_ct_helper_log(skb, ct, "cannot parse SDP message");
return NF_DROP;
}
ret = set_expected_rtp_rtcp(skb, protoff, dataoff,
dptr, datalen,
&rtp_addr, htons(port), t->class,
mediaoff, medialen);
if (ret != NF_ACCEPT)
if (ret != NF_ACCEPT) {
nf_ct_helper_log(skb, ct,
"cannot add expectation for voice");
return ret;
}
/* Update media connection address if present */
if (maddr_len && nf_nat_sdp_addr && ct->status & IPS_NAT_MASK) {
@ -1123,8 +1130,10 @@ static int process_sdp(struct sk_buff *skb, unsigned int protoff,
dptr, datalen, mediaoff,
SDP_HDR_CONNECTION, SDP_HDR_MEDIA,
&rtp_addr);
if (ret != NF_ACCEPT)
if (ret != NF_ACCEPT) {
nf_ct_helper_log(skb, ct, "cannot mangle SDP");
return ret;
}
}
i++;
}
@ -1258,9 +1267,10 @@ static int process_register_request(struct sk_buff *skb, unsigned int protoff,
ret = ct_sip_parse_header_uri(ct, *dptr, NULL, *datalen,
SIP_HDR_CONTACT, NULL,
&matchoff, &matchlen, &daddr, &port);
if (ret < 0)
if (ret < 0) {
nf_ct_helper_log(skb, ct, "cannot parse contact");
return NF_DROP;
else if (ret == 0)
} else if (ret == 0)
return NF_ACCEPT;
/* We don't support third-party registrations */
@ -1273,8 +1283,10 @@ static int process_register_request(struct sk_buff *skb, unsigned int protoff,
if (ct_sip_parse_numerical_param(ct, *dptr,
matchoff + matchlen, *datalen,
"expires=", NULL, NULL, &expires) < 0)
"expires=", NULL, NULL, &expires) < 0) {
nf_ct_helper_log(skb, ct, "cannot parse expires");
return NF_DROP;
}
if (expires == 0) {
ret = NF_ACCEPT;
@ -1282,8 +1294,10 @@ static int process_register_request(struct sk_buff *skb, unsigned int protoff,
}
exp = nf_ct_expect_alloc(ct);
if (!exp)
if (!exp) {
nf_ct_helper_log(skb, ct, "cannot alloc expectation");
return NF_DROP;
}
saddr = NULL;
if (sip_direct_signalling)
@ -1300,9 +1314,10 @@ static int process_register_request(struct sk_buff *skb, unsigned int protoff,
ret = nf_nat_sip_expect(skb, protoff, dataoff, dptr, datalen,
exp, matchoff, matchlen);
else {
if (nf_ct_expect_related(exp) != 0)
if (nf_ct_expect_related(exp) != 0) {
nf_ct_helper_log(skb, ct, "cannot add expectation");
ret = NF_DROP;
else
} else
ret = NF_ACCEPT;
}
nf_ct_expect_put(exp);
@ -1356,9 +1371,10 @@ static int process_register_response(struct sk_buff *skb, unsigned int protoff,
SIP_HDR_CONTACT, &in_contact,
&matchoff, &matchlen,
&addr, &port);
if (ret < 0)
if (ret < 0) {
nf_ct_helper_log(skb, ct, "cannot parse contact");
return NF_DROP;
else if (ret == 0)
} else if (ret == 0)
break;
/* We don't support third-party registrations */
@ -1373,8 +1389,10 @@ static int process_register_response(struct sk_buff *skb, unsigned int protoff,
matchoff + matchlen,
*datalen, "expires=",
NULL, NULL, &c_expires);
if (ret < 0)
if (ret < 0) {
nf_ct_helper_log(skb, ct, "cannot parse expires");
return NF_DROP;
}
if (c_expires == 0)
break;
if (refresh_signalling_expectation(ct, &addr, proto, port,
@ -1408,15 +1426,21 @@ static int process_sip_response(struct sk_buff *skb, unsigned int protoff,
if (*datalen < strlen("SIP/2.0 200"))
return NF_ACCEPT;
code = simple_strtoul(*dptr + strlen("SIP/2.0 "), NULL, 10);
if (!code)
if (!code) {
nf_ct_helper_log(skb, ct, "cannot get code");
return NF_DROP;
}
if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_CSEQ,
&matchoff, &matchlen) <= 0)
&matchoff, &matchlen) <= 0) {
nf_ct_helper_log(skb, ct, "cannot parse cseq");
return NF_DROP;
}
cseq = simple_strtoul(*dptr + matchoff, NULL, 10);
if (!cseq)
if (!cseq) {
nf_ct_helper_log(skb, ct, "cannot get cseq");
return NF_DROP;
}
matchend = matchoff + matchlen + 1;
for (i = 0; i < ARRAY_SIZE(sip_handlers); i++) {
@ -1471,11 +1495,15 @@ static int process_sip_request(struct sk_buff *skb, unsigned int protoff,
continue;
if (ct_sip_get_header(ct, *dptr, 0, *datalen, SIP_HDR_CSEQ,
&matchoff, &matchlen) <= 0)
&matchoff, &matchlen) <= 0) {
nf_ct_helper_log(skb, ct, "cannot parse cseq");
return NF_DROP;
}
cseq = simple_strtoul(*dptr + matchoff, NULL, 10);
if (!cseq)
if (!cseq) {
nf_ct_helper_log(skb, ct, "cannot get cseq");
return NF_DROP;
}
return handler->request(skb, protoff, dataoff, dptr, datalen,
cseq);
@ -1498,8 +1526,10 @@ static int process_sip_msg(struct sk_buff *skb, struct nf_conn *ct,
if (ret == NF_ACCEPT && ct->status & IPS_NAT_MASK) {
nf_nat_sip = rcu_dereference(nf_nat_sip_hook);
if (nf_nat_sip && !nf_nat_sip(skb, protoff, dataoff,
dptr, datalen))
dptr, datalen)) {
nf_ct_helper_log(skb, ct, "cannot NAT SIP message");
ret = NF_DROP;
}
}
return ret;
@ -1563,11 +1593,14 @@ static int sip_help_tcp(struct sk_buff *skb, unsigned int protoff,
end += strlen("\r\n\r\n") + clen;
msglen = origlen = end - dptr;
if (msglen > datalen)
if (msglen > datalen) {
nf_ct_helper_log(skb, ct, "incomplete/bad SIP message");
return NF_DROP;
}
ret = process_sip_msg(skb, ct, protoff, dataoff,
&dptr, &msglen);
/* process_sip_* functions report why this packet is dropped */
if (ret != NF_ACCEPT)
break;
diff = msglen - origlen;

8
net/netfilter/nf_conntrack_tftp.c
View File

@ -60,8 +60,10 @@ static int tftp_help(struct sk_buff *skb,
nf_ct_dump_tuple(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
exp = nf_ct_expect_alloc(ct);
if (exp == NULL)
if (exp == NULL) {
nf_ct_helper_log(skb, ct, "cannot alloc expectation");
return NF_DROP;
}
tuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT,
nf_ct_l3num(ct),
@ -74,8 +76,10 @@ static int tftp_help(struct sk_buff *skb,
nf_nat_tftp = rcu_dereference(nf_nat_tftp_hook);
if (nf_nat_tftp && ct->status & IPS_NAT_MASK)
ret = nf_nat_tftp(skb, ctinfo, exp);
else if (nf_ct_expect_related(exp) != 0)
else if (nf_ct_expect_related(exp) != 0) {
nf_ct_helper_log(skb, ct, "cannot add expectation");
ret = NF_DROP;
}
nf_ct_expect_put(exp);
break;
case TFTP_OPCODE_DATA:

8
net/netfilter/nf_nat_amanda.c
View File

@ -56,15 +56,19 @@ static unsigned int help(struct sk_buff *skb,
}
}
if (port == 0)
if (port == 0) {
nf_ct_helper_log(skb, exp->master, "all ports in use");
return NF_DROP;
}
sprintf(buffer, "%u", port);
ret = nf_nat_mangle_udp_packet(skb, exp->master, ctinfo,
protoff, matchoff, matchlen,
buffer, strlen(buffer));
if (ret != NF_ACCEPT)
if (ret != NF_ACCEPT) {
nf_ct_helper_log(skb, exp->master, "cannot mangle packet");
nf_ct_unexpect_related(exp);
}
return ret;
}

5
net/netfilter/nf_nat_ftp.c
View File

@ -96,8 +96,10 @@ static unsigned int nf_nat_ftp(struct sk_buff *skb,
}
}
if (port == 0)
if (port == 0) {
nf_ct_helper_log(skb, ct, "all ports in use");
return NF_DROP;
}
buflen = nf_nat_ftp_fmt_cmd(ct, type, buffer, sizeof(buffer),
&newaddr, port);
@ -113,6 +115,7 @@ static unsigned int nf_nat_ftp(struct sk_buff *skb,
return NF_ACCEPT;
out:
nf_ct_helper_log(skb, ct, "cannot mangle packet");
nf_ct_unexpect_related(exp);
return NF_DROP;
}

8
net/netfilter/nf_nat_irc.c
View File

@ -56,14 +56,18 @@ static unsigned int help(struct sk_buff *skb,
}
}
if (port == 0)
if (port == 0) {
nf_ct_helper_log(skb, exp->master, "all ports in use");
return NF_DROP;
}
ret = nf_nat_mangle_tcp_packet(skb, exp->master, ctinfo,
protoff, matchoff, matchlen, buffer,
strlen(buffer));
if (ret != NF_ACCEPT)
if (ret != NF_ACCEPT) {
nf_ct_helper_log(skb, exp->master, "cannot mangle packet");
nf_ct_unexpect_related(exp);
}
return ret;
}

49
net/netfilter/nf_nat_sip.c
View File

@ -159,8 +159,10 @@ static unsigned int nf_nat_sip(struct sk_buff *skb, unsigned int protoff,
&matchoff, &matchlen,
&addr, &port) > 0 &&
!map_addr(skb, protoff, dataoff, dptr, datalen,
matchoff, matchlen, &addr, port))
matchoff, matchlen, &addr, port)) {
nf_ct_helper_log(skb, ct, "cannot mangle SIP message");
return NF_DROP;
}
request = 1;
} else
request = 0;
@ -193,8 +195,10 @@ static unsigned int nf_nat_sip(struct sk_buff *skb, unsigned int protoff,
olen = *datalen;
if (!map_addr(skb, protoff, dataoff, dptr, datalen,
matchoff, matchlen, &addr, port))
matchoff, matchlen, &addr, port)) {
nf_ct_helper_log(skb, ct, "cannot mangle Via header");
return NF_DROP;
}
matchend = matchoff + matchlen + *datalen - olen;
@ -209,8 +213,10 @@ static unsigned int nf_nat_sip(struct sk_buff *skb, unsigned int protoff,
&ct->tuplehash[!dir].tuple.dst.u3,
true);
if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
poff, plen, buffer, buflen))
poff, plen, buffer, buflen)) {
nf_ct_helper_log(skb, ct, "cannot mangle maddr");
return NF_DROP;
}
}
/* The received= parameter (RFC 2361) contains the address
@ -225,6 +231,7 @@ static unsigned int nf_nat_sip(struct sk_buff *skb, unsigned int protoff,
false);
if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
poff, plen, buffer, buflen))
nf_ct_helper_log(skb, ct, "cannot mangle received");
return NF_DROP;
}
@ -238,8 +245,10 @@ static unsigned int nf_nat_sip(struct sk_buff *skb, unsigned int protoff,
__be16 p = ct->tuplehash[!dir].tuple.src.u.udp.port;
buflen = sprintf(buffer, "%u", ntohs(p));
if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
poff, plen, buffer, buflen))
poff, plen, buffer, buflen)) {
nf_ct_helper_log(skb, ct, "cannot mangle rport");
return NF_DROP;
}
}
}
@ -253,27 +262,35 @@ next:
&addr, &port) > 0) {
if (!map_addr(skb, protoff, dataoff, dptr, datalen,
matchoff, matchlen,
&addr, port))
&addr, port)) {
nf_ct_helper_log(skb, ct, "cannot mangle contact");
return NF_DROP;
}
}
if (!map_sip_addr(skb, protoff, dataoff, dptr, datalen, SIP_HDR_FROM) ||
!map_sip_addr(skb, protoff, dataoff, dptr, datalen, SIP_HDR_TO))
!map_sip_addr(skb, protoff, dataoff, dptr, datalen, SIP_HDR_TO)) {
nf_ct_helper_log(skb, ct, "cannot mangle SIP from/to");
return NF_DROP;
}
/* Mangle destination port for Cisco phones, then fix up checksums */
if (dir == IP_CT_DIR_REPLY && ct_sip_info->forced_dport) {
struct udphdr *uh;
if (!skb_make_writable(skb, skb->len))
if (!skb_make_writable(skb, skb->len)) {
nf_ct_helper_log(skb, ct, "cannot mangle packet");
return NF_DROP;
}
uh = (void *)skb->data + protoff;
uh->dest = ct_sip_info->forced_dport;
if (!nf_nat_mangle_udp_packet(skb, ct, ctinfo, protoff,
0, 0, NULL, 0))
0, 0, NULL, 0)) {
nf_ct_helper_log(skb, ct, "cannot mangle packet");
return NF_DROP;
}
}
return NF_ACCEPT;
@ -372,15 +389,19 @@ static unsigned int nf_nat_sip_expect(struct sk_buff *skb, unsigned int protoff,
}
}
if (port == 0)
if (port == 0) {
nf_ct_helper_log(skb, ct, "all ports in use for SIP");
return NF_DROP;
}
if (!nf_inet_addr_cmp(&exp->tuple.dst.u3, &exp->saved_addr) ||
exp->tuple.dst.u.udp.port != exp->saved_proto.udp.port) {
buflen = sip_sprintf_addr_port(ct, buffer, &newaddr, port);
if (!mangle_packet(skb, protoff, dataoff, dptr, datalen,
matchoff, matchlen, buffer, buflen))
matchoff, matchlen, buffer, buflen)) {
nf_ct_helper_log(skb, ct, "cannot mangle packet");
goto err;
}
}
return NF_ACCEPT;
@ -573,14 +594,18 @@ static unsigned int nf_nat_sdp_media(struct sk_buff *skb, unsigned int protoff,
}
}
if (port == 0)
if (port == 0) {
nf_ct_helper_log(skb, ct, "all ports in use for SDP media");
goto err1;
}
/* Update media port. */
if (rtp_exp->tuple.dst.u.udp.port != rtp_exp->saved_proto.udp.port &&
!nf_nat_sdp_port(skb, protoff, dataoff, dptr, datalen,
mediaoff, medialen, port))
mediaoff, medialen, port)) {
nf_ct_helper_log(skb, ct, "cannot mangle SDP message");
goto err2;
}
return NF_ACCEPT;

4
net/netfilter/nf_nat_tftp.c
View File

@ -28,8 +28,10 @@ static unsigned int help(struct sk_buff *skb,
= ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.u.udp.port;
exp->dir = IP_CT_DIR_REPLY;
exp->expectfn = nf_nat_follow_master;
if (nf_ct_expect_related(exp) != 0)
if (nf_ct_expect_related(exp) != 0) {
nf_ct_helper_log(skb, exp->master, "cannot add expectation");
return NF_DROP;
}
return NF_ACCEPT;
}

52
net/netfilter/nfnetlink.c
View File

@ -36,8 +36,10 @@ MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_NETFILTER);
static char __initdata nfversion[] = "0.30";
static const struct nfnetlink_subsystem __rcu *subsys_table[NFNL_SUBSYS_COUNT];
static DEFINE_MUTEX(nfnl_mutex);
static struct {
struct mutex mutex;
const struct nfnetlink_subsystem __rcu *subsys;
} table[NFNL_SUBSYS_COUNT];
static const int nfnl_group2type[NFNLGRP_MAX+1] = {
[NFNLGRP_CONNTRACK_NEW] = NFNL_SUBSYS_CTNETLINK,
@ -48,27 +50,32 @@ static const int nfnl_group2type[NFNLGRP_MAX+1] = {
[NFNLGRP_CONNTRACK_EXP_DESTROY] = NFNL_SUBSYS_CTNETLINK_EXP,
};
void nfnl_lock(void)
void nfnl_lock(__u8 subsys_id)
{
mutex_lock(&nfnl_mutex);
mutex_lock(&table[subsys_id].mutex);
}
EXPORT_SYMBOL_GPL(nfnl_lock);
void nfnl_unlock(void)
void nfnl_unlock(__u8 subsys_id)
{
mutex_unlock(&nfnl_mutex);
mutex_unlock(&table[subsys_id].mutex);
}
EXPORT_SYMBOL_GPL(nfnl_unlock);
static struct mutex *nfnl_get_lock(__u8 subsys_id)
{
return &table[subsys_id].mutex;
}
int nfnetlink_subsys_register(const struct nfnetlink_subsystem *n)
{
nfnl_lock();
if (subsys_table[n->subsys_id]) {
nfnl_unlock();
nfnl_lock(n->subsys_id);
if (table[n->subsys_id].subsys) {
nfnl_unlock(n->subsys_id);
return -EBUSY;
}
rcu_assign_pointer(subsys_table[n->subsys_id], n);
nfnl_unlock();
rcu_assign_pointer(table[n->subsys_id].subsys, n);
nfnl_unlock(n->subsys_id);
return 0;
}
@ -76,9 +83,9 @@ EXPORT_SYMBOL_GPL(nfnetlink_subsys_register);
int nfnetlink_subsys_unregister(const struct nfnetlink_subsystem *n)
{
nfnl_lock();
subsys_table[n->subsys_id] = NULL;
nfnl_unlock();
nfnl_lock(n->subsys_id);
table[n->subsys_id].subsys = NULL;
nfnl_unlock(n->subsys_id);
synchronize_rcu();
return 0;
}
@ -91,7 +98,7 @@ static inline const struct nfnetlink_subsystem *nfnetlink_get_subsys(u_int16_t t
if (subsys_id >= NFNL_SUBSYS_COUNT)
return NULL;
return rcu_dereference(subsys_table[subsys_id]);
return rcu_dereference(table[subsys_id].subsys);
}
static inline const struct nfnl_callback *
@ -175,6 +182,7 @@ replay:
struct nlattr *cda[ss->cb[cb_id].attr_count + 1];
struct nlattr *attr = (void *)nlh + min_len;
int attrlen = nlh->nlmsg_len - min_len;
__u8 subsys_id = NFNL_SUBSYS_ID(type);
err = nla_parse(cda, ss->cb[cb_id].attr_count,
attr, attrlen, ss->cb[cb_id].policy);
@ -189,10 +197,9 @@ replay:
rcu_read_unlock();
} else {
rcu_read_unlock();
nfnl_lock();
if (rcu_dereference_protected(
subsys_table[NFNL_SUBSYS_ID(type)],
lockdep_is_held(&nfnl_mutex)) != ss ||
nfnl_lock(subsys_id);
if (rcu_dereference_protected(table[subsys_id].subsys,
lockdep_is_held(nfnl_get_lock(subsys_id))) != ss ||
nfnetlink_find_client(type, ss) != nc)
err = -EAGAIN;
else if (nc->call)
@ -200,7 +207,7 @@ replay:
(const struct nlattr **)cda);
else
err = -EINVAL;
nfnl_unlock();
nfnl_unlock(subsys_id);
}
if (err == -EAGAIN)
goto replay;
@ -267,6 +274,11 @@ static struct pernet_operations nfnetlink_net_ops = {
static int __init nfnetlink_init(void)
{
int i;
for (i=0; i<NFNL_SUBSYS_COUNT; i++)
mutex_init(&table[i].mutex);
pr_info("Netfilter messages via NETLINK v%s.\n", nfversion);
return register_pernet_subsys(&nfnetlink_net_ops);
}

177
net/netfilter/xt_CT.c
View File

@ -20,12 +20,8 @@
#include <net/netfilter/nf_conntrack_timeout.h>
#include <net/netfilter/nf_conntrack_zones.h>
static unsigned int xt_ct_target_v0(struct sk_buff *skb,
const struct xt_action_param *par)
static inline int xt_ct_target(struct sk_buff *skb, struct nf_conn *ct)
{
const struct xt_ct_target_info *info = par->targinfo;
struct nf_conn *ct = info->ct;
/* Previously seen (loopback)? Ignore. */
if (skb->nfct != NULL)
return XT_CONTINUE;
@ -37,21 +33,22 @@ static unsigned int xt_ct_target_v0(struct sk_buff *skb,
return XT_CONTINUE;
}
static unsigned int xt_ct_target_v0(struct sk_buff *skb,
const struct xt_action_param *par)
{
const struct xt_ct_target_info *info = par->targinfo;
struct nf_conn *ct = info->ct;
return xt_ct_target(skb, ct);
}
static unsigned int xt_ct_target_v1(struct sk_buff *skb,
const struct xt_action_param *par)
{
const struct xt_ct_target_info_v1 *info = par->targinfo;
struct nf_conn *ct = info->ct;
/* Previously seen (loopback)? Ignore. */
if (skb->nfct != NULL)
return XT_CONTINUE;
atomic_inc(&ct->ct_general.use);
skb->nfct = &ct->ct_general;
skb->nfctinfo = IP_CT_NEW;
return XT_CONTINUE;
return xt_ct_target(skb, ct);
}
static u8 xt_ct_find_proto(const struct xt_tgchk_param *par)
@ -104,67 +101,6 @@ xt_ct_set_helper(struct nf_conn *ct, const char *helper_name,
return 0;
}
static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
{
struct xt_ct_target_info *info = par->targinfo;
struct nf_conntrack_tuple t;
struct nf_conn *ct;
int ret = -EOPNOTSUPP;
if (info->flags & ~XT_CT_NOTRACK)
return -EINVAL;
if (info->flags & XT_CT_NOTRACK) {
ct = nf_ct_untracked_get();
atomic_inc(&ct->ct_general.use);
goto out;
}
#ifndef CONFIG_NF_CONNTRACK_ZONES
if (info->zone)
goto err1;
#endif
ret = nf_ct_l3proto_try_module_get(par->family);
if (ret < 0)
goto err1;
memset(&t, 0, sizeof(t));
ct = nf_conntrack_alloc(par->net, info->zone, &t, &t, GFP_KERNEL);
ret = PTR_ERR(ct);
if (IS_ERR(ct))
goto err2;
ret = 0;
if ((info->ct_events || info->exp_events) &&
!nf_ct_ecache_ext_add(ct, info->ct_events, info->exp_events,
GFP_KERNEL))
goto err3;
if (info->helper[0]) {
ret = xt_ct_set_helper(ct, info->helper, par);
if (ret < 0)
goto err3;
}
__set_bit(IPS_TEMPLATE_BIT, &ct->status);
__set_bit(IPS_CONFIRMED_BIT, &ct->status);
/* Overload tuple linked list to put us in template list. */
hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode,
&par->net->ct.tmpl);
out:
info->ct = ct;
return 0;
err3:
nf_conntrack_free(ct);
err2:
nf_ct_l3proto_module_put(par->family);
err1:
return ret;
}
#ifdef CONFIG_NF_CONNTRACK_TIMEOUT
static void __xt_ct_tg_timeout_put(struct ctnl_timeout *timeout)
{
@ -242,16 +178,13 @@ out:
#endif
}
static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
static int xt_ct_tg_check(const struct xt_tgchk_param *par,
struct xt_ct_target_info_v1 *info)
{
struct xt_ct_target_info_v1 *info = par->targinfo;
struct nf_conntrack_tuple t;
struct nf_conn *ct;
int ret = -EOPNOTSUPP;
if (info->flags & ~XT_CT_NOTRACK)
return -EINVAL;
if (info->flags & XT_CT_NOTRACK) {
ct = nf_ct_untracked_get();
atomic_inc(&ct->ct_general.use);
@ -309,20 +242,49 @@ err1:
return ret;
}
static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
static int xt_ct_tg_check_v0(const struct xt_tgchk_param *par)
{
struct xt_ct_target_info *info = par->targinfo;
struct nf_conn *ct = info->ct;
struct nf_conn_help *help;
struct xt_ct_target_info_v1 info_v1 = {
.flags = info->flags,
.zone = info->zone,
.ct_events = info->ct_events,
.exp_events = info->exp_events,
};
int ret;
if (!nf_ct_is_untracked(ct)) {
help = nfct_help(ct);
if (help)
module_put(help->helper->me);
if (info->flags & ~XT_CT_NOTRACK)
return -EINVAL;
nf_ct_l3proto_module_put(par->family);
}
nf_ct_put(info->ct);
memcpy(info_v1.helper, info->helper, sizeof(info->helper));
ret = xt_ct_tg_check(par, &info_v1);
if (ret < 0)
return ret;
info->ct = info_v1.ct;
return ret;
}
static int xt_ct_tg_check_v1(const struct xt_tgchk_param *par)
{
struct xt_ct_target_info_v1 *info = par->targinfo;
if (info->flags & ~XT_CT_NOTRACK)
return -EINVAL;
return xt_ct_tg_check(par, par->targinfo);
}
static int xt_ct_tg_check_v2(const struct xt_tgchk_param *par)
{
struct xt_ct_target_info_v1 *info = par->targinfo;
if (info->flags & ~XT_CT_MASK)
return -EINVAL;
return xt_ct_tg_check(par, par->targinfo);
}
static void xt_ct_destroy_timeout(struct nf_conn *ct)
@ -343,9 +305,9 @@ static void xt_ct_destroy_timeout(struct nf_conn *ct)
#endif
}
static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
static void xt_ct_tg_destroy(const struct xt_tgdtor_param *par,
struct xt_ct_target_info_v1 *info)
{
struct xt_ct_target_info_v1 *info = par->targinfo;
struct nf_conn *ct = info->ct;
struct nf_conn_help *help;
@ -361,6 +323,26 @@ static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
nf_ct_put(info->ct);
}
static void xt_ct_tg_destroy_v0(const struct xt_tgdtor_param *par)
{
struct xt_ct_target_info *info = par->targinfo;
struct xt_ct_target_info_v1 info_v1 = {
.flags = info->flags,
.zone = info->zone,
.ct_events = info->ct_events,
.exp_events = info->exp_events,
.ct = info->ct,
};
memcpy(info_v1.helper, info->helper, sizeof(info->helper));
xt_ct_tg_destroy(par, &info_v1);
}
static void xt_ct_tg_destroy_v1(const struct xt_tgdtor_param *par)
{
xt_ct_tg_destroy(par, par->targinfo);
}
static struct xt_target xt_ct_tg_reg[] __read_mostly = {
{
.name = "CT",
@ -383,6 +365,17 @@ static struct xt_target xt_ct_tg_reg[] __read_mostly = {
.table = "raw",
.me = THIS_MODULE,
},
{
.name = "CT",
.family = NFPROTO_UNSPEC,
.revision = 2,
.targetsize = sizeof(struct xt_ct_target_info_v1),
.checkentry = xt_ct_tg_check_v2,
.destroy = xt_ct_tg_destroy_v1,
.target = xt_ct_target_v1,
.table = "raw",
.me = THIS_MODULE,
},
};
static unsigned int