[NETFILTER]: nf_conntrack: reduce masks to a subset of tuples

Since conntrack currently allows to use masks for every bit of both
helper and expectation tuples, we can't hash them and have to keep
them on two global lists that are searched for every new connection.

This patch removes the never used ability to use masks for the
destination part of the expectation tuple and completely removes
masks from helpers since the only reasonable choice is a full
match on l3num, protonum and src.u.all.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

12 files changed, 24 insertions, 84 deletions

diff --git a/net/netfilter/nf_conntrack_amanda.c b/net/netfilter/nf_conntrack_amanda.c
index d21359e..e42ab23 100644
--- a/net/netfilter/nf_conntrack_amanda.c
+++ b/net/netfilter/nf_conntrack_amanda.c
@@ -174,9 +174,6 @@ static struct nf_conntrack_helper amanda_helper[2] __read_mostly = {
 		.tuple.src.l3num	= AF_INET,
 		.tuple.src.u.udp.port	= __constant_htons(10080),
 		.tuple.dst.protonum	= IPPROTO_UDP,
-		.mask.src.l3num		= 0xFFFF,
-		.mask.src.u.udp.port	= __constant_htons(0xFFFF),
-		.mask.dst.protonum	= 0xFF,
 	},
 	{
 		.name			= "amanda",
@@ -187,9 +184,6 @@ static struct nf_conntrack_helper amanda_helper[2] __read_mostly = {
 		.tuple.src.l3num	= AF_INET6,
 		.tuple.src.u.udp.port	= __constant_htons(10080),
 		.tuple.dst.protonum	= IPPROTO_UDP,
-		.mask.src.l3num		= 0xFFFF,
-		.mask.src.u.udp.port	= __constant_htons(0xFFFF),
-		.mask.dst.protonum	= 0xFF,
 	},
 };
 
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c
index 4130ea6..83b5ad8 100644
--- a/net/netfilter/nf_conntrack_expect.c
+++ b/net/netfilter/nf_conntrack_expect.c
@@ -141,25 +141,16 @@ static inline int expect_clash(const struct nf_conntrack_expect *a,
 {
 	/* Part covered by intersection of masks must be unequal,
 	   otherwise they clash */
-	struct nf_conntrack_tuple intersect_mask;
+	struct nf_conntrack_tuple_mask intersect_mask;
 	int count;
 
-	intersect_mask.src.l3num = a->mask.src.l3num & b->mask.src.l3num;
 	intersect_mask.src.u.all = a->mask.src.u.all & b->mask.src.u.all;
-	intersect_mask.dst.u.all = a->mask.dst.u.all & b->mask.dst.u.all;
-	intersect_mask.dst.protonum = a->mask.dst.protonum
-					& b->mask.dst.protonum;
 
 	for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
 		intersect_mask.src.u3.all[count] =
 			a->mask.src.u3.all[count] & b->mask.src.u3.all[count];
 	}
 
-	for (count = 0; count < NF_CT_TUPLE_L3SIZE; count++){
-		intersect_mask.dst.u3.all[count] =
-			a->mask.dst.u3.all[count] & b->mask.dst.u3.all[count];
-	}
-
 	return nf_ct_tuple_mask_cmp(&a->tuple, &b->tuple, &intersect_mask);
 }
 
@@ -168,7 +159,7 @@ static inline int expect_matches(const struct nf_conntrack_expect *a,
 {
 	return a->master == b->master
 		&& nf_ct_tuple_equal(&a->tuple, &b->tuple)
-		&& nf_ct_tuple_equal(&a->mask, &b->mask);
+		&& nf_ct_tuple_mask_equal(&a->mask, &b->mask);
 }
 
 /* Generally a bad idea to call this: could have matched already. */
@@ -224,8 +215,6 @@ void nf_ct_expect_init(struct nf_conntrack_expect *exp, int family,
 	exp->helper = NULL;
 	exp->tuple.src.l3num = family;
 	exp->tuple.dst.protonum = proto;
-	exp->mask.src.l3num = 0xFFFF;
-	exp->mask.dst.protonum = 0xFF;
 
 	if (saddr) {
 		memcpy(&exp->tuple.src.u3, saddr, len);
@@ -242,21 +231,6 @@ void nf_ct_expect_init(struct nf_conntrack_expect *exp, int family,
 		memset(&exp->mask.src.u3, 0x00, sizeof(exp->mask.src.u3));
 	}
 
-	if (daddr) {
-		memcpy(&exp->tuple.dst.u3, daddr, len);
-		if (sizeof(exp->tuple.dst.u3) > len)
-			/* address needs to be cleared for nf_ct_tuple_equal */
-			memset((void *)&exp->tuple.dst.u3 + len, 0x00,
-			       sizeof(exp->tuple.dst.u3) - len);
-		memset(&exp->mask.dst.u3, 0xFF, len);
-		if (sizeof(exp->mask.dst.u3) > len)
-			memset((void *)&exp->mask.dst.u3 + len, 0x00,
-			       sizeof(exp->mask.dst.u3) - len);
-	} else {
-		memset(&exp->tuple.dst.u3, 0x00, sizeof(exp->tuple.dst.u3));
-		memset(&exp->mask.dst.u3, 0x00, sizeof(exp->mask.dst.u3));
-	}
-
 	if (src) {
 		exp->tuple.src.u.all = (__force u16)*src;
 		exp->mask.src.u.all = 0xFFFF;
@@ -265,13 +239,13 @@ void nf_ct_expect_init(struct nf_conntrack_expect *exp, int family,
 		exp->mask.src.u.all = 0;
 	}
 
-	if (dst) {
-		exp->tuple.dst.u.all = (__force u16)*dst;
-		exp->mask.dst.u.all = 0xFFFF;
-	} else {
-		exp->tuple.dst.u.all = 0;
-		exp->mask.dst.u.all = 0;
-	}
+	memcpy(&exp->tuple.dst.u3, daddr, len);
+	if (sizeof(exp->tuple.dst.u3) > len)
+		/* address needs to be cleared for nf_ct_tuple_equal */
+		memset((void *)&exp->tuple.dst.u3 + len, 0x00,
+		       sizeof(exp->tuple.dst.u3) - len);
+
+	exp->tuple.dst.u.all = (__force u16)*dst;
 }
 EXPORT_SYMBOL_GPL(nf_ct_expect_init);
 
diff --git a/net/netfilter/nf_conntrack_ftp.c b/net/netfilter/nf_conntrack_ftp.c
index 9ad1519..198330b 100644
--- a/net/netfilter/nf_conntrack_ftp.c
+++ b/net/netfilter/nf_conntrack_ftp.c
@@ -560,9 +560,6 @@ static int __init nf_conntrack_ftp_init(void)
 		for (j = 0; j < 2; j++) {
 			ftp[i][j].tuple.src.u.tcp.port = htons(ports[i]);
 			ftp[i][j].tuple.dst.protonum = IPPROTO_TCP;
-			ftp[i][j].mask.src.l3num = 0xFFFF;
-			ftp[i][j].mask.src.u.tcp.port = htons(0xFFFF);
-			ftp[i][j].mask.dst.protonum = 0xFF;
 			ftp[i][j].max_expected = 1;
 			ftp[i][j].timeout = 5 * 60;	/* 5 Minutes */
 			ftp[i][j].me = THIS_MODULE;
diff --git a/net/netfilter/nf_conntrack_h323_main.c b/net/netfilter/nf_conntrack_h323_main.c
index 61ae90f..8c57b81 100644
--- a/net/netfilter/nf_conntrack_h323_main.c
+++ b/net/netfilter/nf_conntrack_h323_main.c
@@ -626,8 +626,6 @@ static struct nf_conntrack_helper nf_conntrack_helper_h245 __read_mostly = {
 	.max_expected		= H323_RTP_CHANNEL_MAX * 4 + 2 /* T.120 */,
 	.timeout		= 240,
 	.tuple.dst.protonum	= IPPROTO_UDP,
-	.mask.src.u.udp.port	= __constant_htons(0xFFFF),
-	.mask.dst.protonum	= 0xFF,
 	.help			= h245_help
 };
 
@@ -1173,9 +1171,6 @@ static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
 		.tuple.src.l3num	= AF_INET,
 		.tuple.src.u.tcp.port	= __constant_htons(Q931_PORT),
 		.tuple.dst.protonum	= IPPROTO_TCP,
-		.mask.src.l3num		= 0xFFFF,
-		.mask.src.u.tcp.port	= __constant_htons(0xFFFF),
-		.mask.dst.protonum	= 0xFF,
 		.help			= q931_help
 	},
 	{
@@ -1187,9 +1182,6 @@ static struct nf_conntrack_helper nf_conntrack_helper_q931[] __read_mostly = {
 		.tuple.src.l3num	= AF_INET6,
 		.tuple.src.u.tcp.port	= __constant_htons(Q931_PORT),
 		.tuple.dst.protonum	= IPPROTO_TCP,
-		.mask.src.l3num		= 0xFFFF,
-		.mask.src.u.tcp.port	= __constant_htons(0xFFFF),
-		.mask.dst.protonum	= 0xFF,
 		.help			= q931_help
 	},
 };
@@ -1751,9 +1743,6 @@ static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
 		.tuple.src.l3num	= AF_INET,
 		.tuple.src.u.udp.port	= __constant_htons(RAS_PORT),
 		.tuple.dst.protonum	= IPPROTO_UDP,
-		.mask.src.l3num		= 0xFFFF,
-		.mask.src.u.udp.port	= __constant_htons(0xFFFF),
-		.mask.dst.protonum	= 0xFF,
 		.help			= ras_help,
 	},
 	{
@@ -1764,9 +1753,6 @@ static struct nf_conntrack_helper nf_conntrack_helper_ras[] __read_mostly = {
 		.tuple.src.l3num	= AF_INET6,
 		.tuple.src.u.udp.port	= __constant_htons(RAS_PORT),
 		.tuple.dst.protonum	= IPPROTO_UDP,
-		.mask.src.l3num		= 0xFFFF,
-		.mask.src.u.udp.port	= __constant_htons(0xFFFF),
-		.mask.dst.protonum	= 0xFF,
 		.help			= ras_help,
 	},
 };
diff --git a/net/netfilter/nf_conntrack_helper.c b/net/netfilter/nf_conntrack_helper.c
index 89a5f73..fdabf82 100644
--- a/net/netfilter/nf_conntrack_helper.c
+++ b/net/netfilter/nf_conntrack_helper.c
@@ -34,9 +34,10 @@ struct nf_conntrack_helper *
 __nf_ct_helper_find(const struct nf_conntrack_tuple *tuple)
 {
 	struct nf_conntrack_helper *h;
+	struct nf_conntrack_tuple_mask mask = { .src.u.all = htons(0xFFFF) };
 
 	list_for_each_entry(h, &helpers, list) {
-		if (nf_ct_tuple_mask_cmp(tuple, &h->tuple, &h->mask))
+		if (nf_ct_tuple_src_mask_cmp(tuple, &h->tuple, &mask))
 			return h;
 	}
 	return NULL;
diff --git a/net/netfilter/nf_conntrack_irc.c b/net/netfilter/nf_conntrack_irc.c
index 79da93e..8c73407 100644
--- a/net/netfilter/nf_conntrack_irc.c
+++ b/net/netfilter/nf_conntrack_irc.c
@@ -239,9 +239,6 @@ static int __init nf_conntrack_irc_init(void)
 		irc[i].tuple.src.l3num = AF_INET;
 		irc[i].tuple.src.u.tcp.port = htons(ports[i]);
 		irc[i].tuple.dst.protonum = IPPROTO_TCP;
-		irc[i].mask.src.l3num = 0xFFFF;
-		irc[i].mask.src.u.tcp.port = htons(0xFFFF);
-		irc[i].mask.dst.protonum = 0xFF;
 		irc[i].max_expected = max_dcc_channels;
 		irc[i].timeout = dcc_timeout;
 		irc[i].me = THIS_MODULE;
diff --git a/net/netfilter/nf_conntrack_netbios_ns.c b/net/netfilter/nf_conntrack_netbios_ns.c
index ea585c7..1d59fab 100644
--- a/net/netfilter/nf_conntrack_netbios_ns.c
+++ b/net/netfilter/nf_conntrack_netbios_ns.c
@@ -83,9 +83,6 @@ static int help(struct sk_buff **pskb, unsigned int protoff,
 
 	exp->mask.src.u3.ip       = mask;
 	exp->mask.src.u.udp.port  = htons(0xFFFF);
-	exp->mask.dst.u3.ip       = htonl(0xFFFFFFFF);
-	exp->mask.dst.u.udp.port  = htons(0xFFFF);
-	exp->mask.dst.protonum    = 0xFF;
 
 	exp->expectfn             = NULL;
 	exp->flags                = NF_CT_EXPECT_PERMANENT;
@@ -104,9 +101,6 @@ static struct nf_conntrack_helper helper __read_mostly = {
 	.tuple.src.l3num	= AF_INET,
 	.tuple.src.u.udp.port	= __constant_htons(NMBD_PORT),
 	.tuple.dst.protonum	= IPPROTO_UDP,
-	.mask.src.l3num		= 0xFFFF,
-	.mask.src.u.udp.port	= __constant_htons(0xFFFF),
-	.mask.dst.protonum	= 0xFF,
 	.max_expected		= 1,
 	.me			= THIS_MODULE,
 	.help			= help,
diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 954cc58..2064914 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -1094,22 +1094,29 @@ nfattr_failure:
 static inline int
 ctnetlink_exp_dump_mask(struct sk_buff *skb,
 			const struct nf_conntrack_tuple *tuple,
-			const struct nf_conntrack_tuple *mask)
+			const struct nf_conntrack_tuple_mask *mask)
 {
 	int ret;
 	struct nf_conntrack_l3proto *l3proto;
 	struct nf_conntrack_l4proto *l4proto;
-	struct nfattr *nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
+	struct nf_conntrack_tuple m;
+	struct nfattr *nest_parms;
+
+	memset(&m, 0xFF, sizeof(m));
+	m.src.u.all = mask->src.u.all;
+	memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
+
+	nest_parms = NFA_NEST(skb, CTA_EXPECT_MASK);
 
 	l3proto = nf_ct_l3proto_find_get(tuple->src.l3num);
-	ret = ctnetlink_dump_tuples_ip(skb, mask, l3proto);
+	ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto);
 	nf_ct_l3proto_put(l3proto);
 
 	if (unlikely(ret < 0))
 		goto nfattr_failure;
 
 	l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum);
-	ret = ctnetlink_dump_tuples_proto(skb, mask, l4proto);
+	ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
 	nf_ct_l4proto_put(l4proto);
 	if (unlikely(ret < 0))
 		goto nfattr_failure;
@@ -1447,7 +1454,8 @@ ctnetlink_create_expect(struct nfattr *cda[], u_int8_t u3)
 	exp->master = ct;
 	exp->helper = NULL;
 	memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple));
-	memcpy(&exp->mask, &mask, sizeof(struct nf_conntrack_tuple));
+	memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3));
+	exp->mask.src.u.all = mask.src.u.all;
 
 	err = nf_ct_expect_related(exp);
 	nf_ct_expect_put(exp);
diff --git a/net/netfilter/nf_conntrack_pptp.c b/net/netfilter/nf_conntrack_pptp.c
index 916e106..63dac5e 100644
--- a/net/netfilter/nf_conntrack_pptp.c
+++ b/net/netfilter/nf_conntrack_pptp.c
@@ -585,9 +585,6 @@ static struct nf_conntrack_helper pptp __read_mostly = {
 	.tuple.src.l3num	= AF_INET,
 	.tuple.src.u.tcp.port	= __constant_htons(PPTP_CONTROL_PORT),
 	.tuple.dst.protonum	= IPPROTO_TCP,
-	.mask.src.l3num		= 0xffff,
-	.mask.src.u.tcp.port	= __constant_htons(0xffff),
-	.mask.dst.protonum	= 0xff,
 	.help			= conntrack_pptp_help,
 	.destroy		= pptp_destroy_siblings,
 };
diff --git a/net/netfilter/nf_conntrack_sane.c b/net/netfilter/nf_conntrack_sane.c
index 28ed303..edd10df 100644
--- a/net/netfilter/nf_conntrack_sane.c
+++ b/net/netfilter/nf_conntrack_sane.c
@@ -206,8 +206,6 @@ static int __init nf_conntrack_sane_init(void)
 		for (j = 0; j < 2; j++) {
 			sane[i][j].tuple.src.u.tcp.port = htons(ports[i]);
 			sane[i][j].tuple.dst.protonum = IPPROTO_TCP;
-			sane[i][j].mask.src.u.tcp.port = 0xFFFF;
-			sane[i][j].mask.dst.protonum = 0xFF;
 			sane[i][j].max_expected = 1;
 			sane[i][j].timeout = 5 * 60;	/* 5 Minutes */
 			sane[i][j].me = THIS_MODULE;
diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index 1f17f80..5b78f0e 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -506,9 +506,6 @@ static int __init nf_conntrack_sip_init(void)
 		for (j = 0; j < 2; j++) {
 			sip[i][j].tuple.dst.protonum = IPPROTO_UDP;
 			sip[i][j].tuple.src.u.udp.port = htons(ports[i]);
-			sip[i][j].mask.src.l3num = 0xFFFF;
-			sip[i][j].mask.src.u.udp.port = htons(0xFFFF);
-			sip[i][j].mask.dst.protonum = 0xFF;
 			sip[i][j].max_expected = 2;
 			sip[i][j].timeout = 3 * 60; /* 3 minutes */
 			sip[i][j].me = THIS_MODULE;
diff --git a/net/netfilter/nf_conntrack_tftp.c b/net/netfilter/nf_conntrack_tftp.c
index 53d57b4..db0387c 100644
--- a/net/netfilter/nf_conntrack_tftp.c
+++ b/net/netfilter/nf_conntrack_tftp.c
@@ -126,9 +126,6 @@ static int __init nf_conntrack_tftp_init(void)
 		for (j = 0; j < 2; j++) {
 			tftp[i][j].tuple.dst.protonum = IPPROTO_UDP;
 			tftp[i][j].tuple.src.u.udp.port = htons(ports[i]);
-			tftp[i][j].mask.src.l3num = 0xFFFF;
-			tftp[i][j].mask.dst.protonum = 0xFF;
-			tftp[i][j].mask.src.u.udp.port = htons(0xFFFF);
 			tftp[i][j].max_expected = 1;
 			tftp[i][j].timeout = 5 * 60; /* 5 minutes */
 			tftp[i][j].me = THIS_MODULE;