Allow one to specify a netblock in a binat rule:

binat on fxp0 from 192.168.0.32/27 to any -> 10.0.7.128/27

Both the network mask on the source and redirect addresses MUST be the
same, and it works by essentially combining the network section of the
redirect address with the host section of the source address.

from ryan

ok dhartmei@

2 files changed, 101 insertions, 41 deletions

diff --git a/sys/net/pf.c b/sys/net/pf.c
index a0359e45d18..488fc41d91f 100644
--- a/sys/net/pf.c
+++ b/sys/net/pf.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pf.c,v 1.254 2002/10/08 05:12:08 kjc Exp $ */
+/*	$OpenBSD: pf.c,v 1.255 2002/10/14 12:58:27 henning Exp $ */
 
 /*
  * Copyright (c) 2001 Daniel Hartmeier
@@ -194,7 +194,8 @@ struct pf_nat		*pf_get_nat(struct ifnet *, u_int8_t,
 			    struct pf_addr *, u_int16_t,
 			    struct pf_addr *, u_int16_t, int);
 struct pf_binat		*pf_get_binat(int, struct ifnet *, u_int8_t,
-			    struct pf_addr *, struct pf_addr *, int);
+			    struct pf_addr *, struct pf_addr *,
+			    struct pf_addr *, int);
 struct pf_rdr		*pf_get_rdr(struct ifnet *, u_int8_t,
 			    struct pf_addr *, struct pf_addr *, u_int16_t, int);
 int			 pf_test_tcp(struct pf_rule **, int, struct ifnet *,
@@ -221,6 +222,10 @@ int			 pf_test_state_other(struct pf_state **, int,
 void			*pf_pull_hdr(struct mbuf *, int, void *, int,
 			    u_short *, u_short *, int);
 void			 pf_calc_skip_steps(struct pf_rulequeue *);
+#ifdef INET6
+void			 pf_poolmask(struct pf_addr *, struct pf_addr*,
+			    struct pf_addr *, struct pf_addr *, u_int8_t);
+#endif /* INET6 */
 int			 pf_get_sport(u_int8_t, u_int8_t,
 			    struct pf_addr *, struct pf_addr *,
 			    u_int16_t, u_int16_t *, u_int16_t, u_int16_t);
@@ -446,12 +451,16 @@ pf_compare_binats(struct pf_binat *a, struct pf_binat *b)
 		return (1);
 	if (PF_ANEQ(&a->saddr.addr, &b->saddr.addr, a->af))
 		return (1);
+	if (PF_ANEQ(&a->smask, &b->smask, a->af))
+		return (1);
 	if (PF_ANEQ(&a->daddr.addr, &b->daddr.addr, a->af))
 		return (1);
 	if (PF_ANEQ(&a->dmask, &b->dmask, a->af))
 		return (1);
 	if (PF_ANEQ(&a->raddr.addr, &b->raddr.addr, a->af))
 		return (1);
+	if (PF_ANEQ(&a->rmask, &b->rmask, a->af))
+		return (1);
 	if (strcmp(a->ifname, b->ifname))
 		return (1);
 	return (0);
@@ -1362,6 +1371,32 @@ pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
 	return (pf_match(op, a1, a2, g));
 }
 
+#ifdef INET6
+void
+pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
+    struct pf_addr *rmask, struct pf_addr *saddr, u_int8_t af)
+{
+	switch (af) {
+#ifdef INET
+	case AF_INET:
+		naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
+		((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 
+		break;
+#endif /* INET */
+	case AF_INET6:
+		naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
+		((rmask->addr32[0] ^ 0xffffffff ) & saddr->addr32[0]); 
+		naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
+		((rmask->addr32[1] ^ 0xffffffff ) & saddr->addr32[1]); 
+		naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
+		((rmask->addr32[2] ^ 0xffffffff ) & saddr->addr32[2]); 
+		naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
+		((rmask->addr32[3] ^ 0xffffffff ) & saddr->addr32[3]); 
+		break;
+	}
+}
+#endif /* INET6 */
+
 int
 pf_get_sport(u_int8_t af, u_int8_t proto,
     struct pf_addr *daddr, struct pf_addr *raddr,
@@ -1465,12 +1500,9 @@ pf_get_nat(struct ifnet *ifp, u_int8_t proto, struct pf_addr *saddr,
 
 struct pf_binat *
 pf_get_binat(int direction, struct ifnet *ifp, u_int8_t proto,
-    struct pf_addr *saddr, struct pf_addr *daddr, int af)
+    struct pf_addr *saddr, struct pf_addr *daddr, struct pf_addr *naddr, int af)
 {
 	struct pf_binat *b, *bm = NULL;
-	struct pf_addr fullmask;
-
-	memset(&fullmask, 0xff, sizeof(fullmask));
 
 	b = TAILQ_FIRST(pf_binats_active);
 	while (b && bm == NULL) {
@@ -1479,7 +1511,7 @@ pf_get_binat(int direction, struct ifnet *ifp, u_int8_t proto,
 		    (!b->af || b->af == af) &&
 		    (b->saddr.addr_dyn == NULL ||
 		    !b->saddr.addr_dyn->undefined) &&
-		    PF_MATCHA(0, &b->saddr.addr, &fullmask, saddr, af) &&
+		    PF_MATCHA(0, &b->saddr.addr, &b->smask, saddr, af) &&
 		    (b->daddr.addr_dyn == NULL ||
 		    !b->daddr.addr_dyn->undefined) &&
 		    PF_MATCHA(b->dnot, &b->daddr.addr, &b->dmask, daddr, af))
@@ -1489,7 +1521,7 @@ pf_get_binat(int direction, struct ifnet *ifp, u_int8_t proto,
 		    (!b->af || b->af == af) &&
 		    (b->raddr.addr_dyn == NULL ||
 		    !b->raddr.addr_dyn->undefined) &&
-		    PF_MATCHA(0, &b->raddr.addr, &fullmask, saddr, af) &&
+		    PF_MATCHA(0, &b->raddr.addr, &b->rmask, saddr, af) &&
 		    (b->daddr.addr_dyn == NULL ||
 		    !b->daddr.addr_dyn->undefined) &&
 		    PF_MATCHA(b->dnot, &b->daddr.addr, &b->dmask, daddr, af))
@@ -1497,14 +1529,29 @@ pf_get_binat(int direction, struct ifnet *ifp, u_int8_t proto,
 		else
 			b = TAILQ_NEXT(b, entries);
 	}
-	if (bm && bm->no)
-		return (NULL);
-	if (bm && direction == PF_OUT && bm->raddr.addr_dyn != NULL &&
-	    bm->raddr.addr_dyn->undefined)
-		return (NULL);
-	if (bm && direction == PF_IN && bm->saddr.addr_dyn != NULL &&
-	    bm->saddr.addr_dyn->undefined)
-		return (NULL);
+	if (bm) {
+		if (bm->no)
+			return (NULL);
+		switch (direction) {
+		case PF_OUT:
+			if (bm->raddr.addr_dyn != NULL &&
+			    bm->raddr.addr_dyn->undefined)
+				return (NULL);
+			else
+				PF_POOLMASK(naddr, &bm->raddr.addr,
+				    &bm->rmask, saddr, af); 
+			break;
+		case PF_IN:
+			if (bm->saddr.addr_dyn != NULL &&
+			    bm->saddr.addr_dyn->undefined)
+				return (NULL);
+			else
+				PF_POOLMASK(naddr, &bm->saddr.addr,
+				    &bm->smask, saddr, af); 
+			break;
+		}
+	}
+
 	return (bm);
 }
 
@@ -1609,7 +1656,7 @@ pf_test_tcp(struct pf_rule **rm, int direction, struct ifnet *ifp,
 	struct pf_nat *nat = NULL;
 	struct pf_binat *binat = NULL;
 	struct pf_rdr *rdr = NULL;
-	struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr;
+	struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr, naddr;
 	struct tcphdr *th = pd->hdr.tcp;
 	u_int16_t bport, nport = 0, af = pd->af;
 	int lookup = -1;
@@ -1624,11 +1671,11 @@ pf_test_tcp(struct pf_rule **rm, int direction, struct ifnet *ifp,
 	if (direction == PF_OUT) {
 		/* check outgoing packet for BINAT */
 		if ((binat = pf_get_binat(PF_OUT, ifp, IPPROTO_TCP,
-		    saddr, daddr, af)) != NULL) {
+		    saddr, daddr, &naddr, af)) != NULL) {
 			PF_ACPY(&baddr, saddr, af);
 			bport = th->th_sport;
 			pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
-			    &th->th_sum, &binat->raddr.addr, th->th_sport, 0, af);
+			    &th->th_sum, &naddr, th->th_sport, 0, af);
 			rewrite++;
 		}
 		/* check outgoing packet for NAT */
@@ -1669,11 +1716,11 @@ pf_test_tcp(struct pf_rule **rm, int direction, struct ifnet *ifp,
 		}
 		/* check incoming packet for BINAT */
 		else if ((binat = pf_get_binat(PF_IN, ifp, IPPROTO_TCP,
-		    daddr, saddr, af)) != NULL) {
+		    daddr, saddr, &naddr, af)) != NULL) {
 			PF_ACPY(&baddr, daddr, af);
 			bport = th->th_dport;
 			pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
-			    &th->th_sum, &binat->saddr.addr, th->th_dport, 0, af);
+			    &th->th_sum, &naddr, th->th_dport, 0, af);
 			rewrite++;
 		}
 	}
@@ -1875,7 +1922,7 @@ pf_test_udp(struct pf_rule **rm, int direction, struct ifnet *ifp,
 	struct pf_nat *nat = NULL;
 	struct pf_binat *binat = NULL;
 	struct pf_rdr *rdr = NULL;
-	struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr;
+	struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr, naddr;
 	struct udphdr *uh = pd->hdr.udp;
 	u_int16_t bport, nport = 0, af = pd->af;
 	int lookup = -1;
@@ -1890,11 +1937,11 @@ pf_test_udp(struct pf_rule **rm, int direction, struct ifnet *ifp,
 	if (direction == PF_OUT) {
 		/* check outgoing packet for BINAT */
 		if ((binat = pf_get_binat(PF_OUT, ifp, IPPROTO_UDP,
-		    saddr, daddr, af)) != NULL) {
+		    saddr, daddr, &naddr, af)) != NULL) {
 			PF_ACPY(&baddr, saddr, af);
 			bport = uh->uh_sport;
 			pf_change_ap(saddr, &uh->uh_sport, pd->ip_sum,
-			    &uh->uh_sum, &binat->raddr.addr, uh->uh_sport, 1, af);
+			    &uh->uh_sum, &naddr, uh->uh_sport, 1, af);
 			rewrite++;
 		}
 		/* check outgoing packet for NAT */
@@ -1936,11 +1983,11 @@ pf_test_udp(struct pf_rule **rm, int direction, struct ifnet *ifp,
 		}
 		/* check incoming packet for BINAT */
 		else if ((binat = pf_get_binat(PF_IN, ifp, IPPROTO_UDP,
-		    daddr, saddr, af)) != NULL) {
+		    daddr, saddr, &naddr, af)) != NULL) {
 			PF_ACPY(&baddr, daddr, af);
 			bport = uh->uh_dport;
 			pf_change_ap(daddr, &uh->uh_dport, pd->ip_sum,
-			    &uh->uh_sum, &binat->saddr.addr, uh->uh_dport, 1, af);
+			    &uh->uh_sum, &naddr, uh->uh_dport, 1, af);
 			rewrite++;
 		}
 	}
@@ -2118,7 +2165,7 @@ pf_test_icmp(struct pf_rule **rm, int direction, struct ifnet *ifp,
 	struct pf_nat *nat = NULL;
 	struct pf_binat *binat = NULL;
 	struct pf_rdr *rdr = NULL;
-	struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr;
+	struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr, naddr;
 	struct pf_rule *r;
 	u_short reason;
 	u_int16_t icmpid, af = pd->af;
@@ -2163,19 +2210,19 @@ pf_test_icmp(struct pf_rule **rm, int direction, struct ifnet *ifp,
 	if (direction == PF_OUT) {
 		/* check outgoing packet for BINAT */
 		if ((binat = pf_get_binat(PF_OUT, ifp, IPPROTO_ICMP,
-		    saddr, daddr, af)) != NULL) {
+		    saddr, daddr, &naddr, af)) != NULL) {
 			PF_ACPY(&baddr, saddr, af);
 			switch (af) {
 #ifdef INET
 			case AF_INET:
 				pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
-				    binat->raddr.addr.v4.s_addr, 0);
+				    naddr.v4.s_addr, 0);
 				break;
 #endif /* INET */
 #ifdef INET6
 			case AF_INET6:
 				pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
-				    &binat->raddr.addr, 0);
+				    &naddr, 0);
 				rewrite++;
 				break;
 #endif /* INET6 */
@@ -2224,19 +2271,19 @@ pf_test_icmp(struct pf_rule **rm, int direction, struct ifnet *ifp,
 		}
 		/* check incoming packet for BINAT */
 		else if ((binat = pf_get_binat(PF_IN, ifp, IPPROTO_ICMP,
-		    daddr, saddr, af)) != NULL) {
+		    daddr, saddr, &naddr, af)) != NULL) {
 			PF_ACPY(&baddr, daddr, af);
 			switch (af) {
 #ifdef INET
 			case AF_INET:
 				pf_change_a(&daddr->v4.s_addr,
-				    pd->ip_sum, binat->saddr.addr.v4.s_addr, 0);
+				    pd->ip_sum, naddr.v4.s_addr, 0);
 				break;
 #endif /* INET */
 #ifdef INET6
 			case AF_INET6:
 				pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
-				    &binat->saddr.addr, 0);
+				    &naddr, 0);
 				rewrite++;
 				break;
 #endif /* INET6 */
@@ -2383,7 +2430,7 @@ pf_test_other(struct pf_rule **rm, int direction, struct ifnet *ifp,
 	struct pf_nat *nat = NULL;
 	struct pf_binat *binat = NULL;
 	struct pf_rdr *rdr = NULL;
-	struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr;
+	struct pf_addr *saddr = pd->src, *daddr = pd->dst, baddr, naddr;
 	u_int8_t af = pd->af;
 	u_short reason;
 
@@ -2393,18 +2440,18 @@ pf_test_other(struct pf_rule **rm, int direction, struct ifnet *ifp,
 	if (direction == PF_OUT) {
 		/* check outgoing packet for BINAT */
 		if ((binat = pf_get_binat(PF_OUT, ifp, pd->proto,
-		    saddr, daddr, af)) != NULL) {
+		    saddr, daddr, &naddr, af)) != NULL) {
 			PF_ACPY(&baddr, saddr, af);
 			switch (af) {
 #ifdef INET
 			case AF_INET:
 				pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
-				    binat->raddr.addr.v4.s_addr, 0);
+				    naddr.v4.s_addr, 0);
 				break;
 #endif /* INET */
 #ifdef INET6
 			case AF_INET6:
-				PF_ACPY(saddr, &binat->raddr.addr, af);
+				PF_ACPY(saddr, &naddr, af);
 				break;
 #endif /* INET6 */
 			}
@@ -2448,18 +2495,18 @@ pf_test_other(struct pf_rule **rm, int direction, struct ifnet *ifp,
 		}
 		/* check incoming packet for BINAT */
 		else if ((binat = pf_get_binat(PF_IN, ifp, pd->proto,
-		    daddr, saddr, af)) != NULL) {
+		    daddr, saddr, &naddr, af)) != NULL) {
 			PF_ACPY(&baddr, daddr, af);
 			switch (af) {
 #ifdef INET
 			case AF_INET:
 				pf_change_a(&daddr->v4.s_addr,
-				    pd->ip_sum, binat->saddr.addr.v4.s_addr, 0);
+				    pd->ip_sum, naddr.v4.s_addr, 0);
 				break;
 #endif /* INET */
 #ifdef INET6
 			case AF_INET6:
-				PF_ACPY(daddr, &binat->saddr.addr, af);
+				PF_ACPY(daddr, &naddr, af);
 				break;
 #endif /* INET6 */
 			}
diff --git a/sys/net/pfvar.h b/sys/net/pfvar.h
index e35ff183e45..63593bd7cc0 100644
--- a/sys/net/pfvar.h
+++ b/sys/net/pfvar.h
@@ -1,4 +1,4 @@
-/*	$OpenBSD: pfvar.h,v 1.97 2002/10/10 12:29:33 mickey Exp $ */
+/*	$OpenBSD: pfvar.h,v 1.98 2002/10/14 12:58:28 henning Exp $ */
 
 /*
  * Copyright (c) 2001 Daniel Hartmeier
@@ -143,6 +143,9 @@ struct pf_addr_dyn {
 #define PF_ACPY(a, b, f) \
 	pf_addrcpy(a, b, f)
 
+#define PF_POOLMASK(a, b, c, d, f) \
+	pf_poolmask(a, b, c, d, f)
+
 #else
 
 /* Just IPv6 */
@@ -172,6 +175,9 @@ struct pf_addr_dyn {
 #define PF_ACPY(a, b, f) \
 	pf_addrcpy(a, b, f)
 
+#define PF_POOLMASK(a, b, c, d, f) \
+	pf_poolmask(a, b, c, d, f)
+
 #else
 
 /* Just IPv4 */
@@ -192,6 +198,11 @@ struct pf_addr_dyn {
 #define PF_ACPY(a, b, f) \
 	(a)->v4.s_addr = (b)->v4.s_addr
 
+#define PF_POOLMASK(a, b, c, d, f) \
+       do { \
+               (a)->addr32[0] = ((b)->addr32[0] & (c)->addr32[0]) | \
+               (((c)->addr32[0] ^ 0xffffffff ) & (d)->addr32[0]); \
+       } while (0)
 
 #endif /* PF_INET_ONLY */
 #endif /* PF_INET6_ONLY */
@@ -360,7 +371,9 @@ struct pf_binat {
 	struct pf_addr_wrap	 saddr;
 	struct pf_addr_wrap	 daddr;
 	struct pf_addr_wrap	 raddr;
+	struct pf_addr		 smask;
 	struct pf_addr		 dmask;
+	struct pf_addr		 rmask;
 	u_int8_t		 af;
 	u_int8_t		 proto;
 	u_int8_t		 dnot;