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Index: sbin/ipfw/ipfw.8
===================================================================
--- sbin/ipfw/ipfw.8
+++ sbin/ipfw/ipfw.8
@@ -1,7 +1,7 @@
.\"
.\" $FreeBSD$
.\"
-.Dd June 21, 2019
+.Dd February 13, 2020
.Dt IPFW 8
.Os
.Sh NAME
@@ -3246,6 +3246,9 @@
Obey transparent proxy rules only, packet aliasing is not performed.
.It Cm skip_global
Skip instance in case of global state lookup (see below).
+.It Cm port_range Ar lower-upper
+Set the aliasing ports between the ranges given. Upper port has to be greater
+than lower.
.El
.Pp
Some specials value can be supplied instead of
Index: sbin/ipfw/ipfw2.h
===================================================================
--- sbin/ipfw/ipfw2.h
+++ sbin/ipfw/ipfw2.h
@@ -285,6 +285,7 @@
TOK_STATES_CHUNKS,
TOK_JMAXLEN,
TOK_PORT_RANGE,
+ TOK_PORT_ALIAS,
TOK_HOST_DEL_AGE,
TOK_PG_DEL_AGE,
TOK_TCP_SYN_AGE,
Index: sbin/ipfw/main.c
===================================================================
--- sbin/ipfw/main.c
+++ sbin/ipfw/main.c
@@ -45,7 +45,8 @@
"[pipe|queue] {zero|delete|show} [N{,N}]\n"
"nat N config {ip IPADDR|if IFNAME|log|deny_in|same_ports|unreg_only|unreg_cgn|\n"
" reset|reverse|proxy_only|redirect_addr linkspec|\n"
-" redirect_port linkspec|redirect_proto linkspec}\n"
+" redirect_port linkspec|redirect_proto linkspec|\n"
+" port_range lower-upper}\n"
"set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n"
"set N {show|list|zero|resetlog|delete} [N{,N}] | flush\n"
"table N {add ip[/bits] [value] | delete ip[/bits] | flush | list}\n"
Index: sbin/ipfw/nat.c
===================================================================
--- sbin/ipfw/nat.c
+++ sbin/ipfw/nat.c
@@ -65,6 +65,7 @@
{ "reset", TOK_RESET_ADDR },
{ "reverse", TOK_ALIAS_REV },
{ "proxy_only", TOK_PROXY_ONLY },
+ { "port_range", TOK_PORT_ALIAS },
{ "redirect_addr", TOK_REDIR_ADDR },
{ "redirect_port", TOK_REDIR_PORT },
{ "redirect_proto", TOK_REDIR_PROTO },
@@ -752,12 +753,37 @@
printf("\n");
}
+static int
+nat_port_alias_parse(char *str, u_short *lpout, u_short *hpout) {
+ long lp, hp;
+ char *ptr;
+
+ /* Lower port parsing */
+ lp = (long) strtol(str, &ptr, 10);
+ if (lp < 1024 || lp > 65535)
+ return 0;
+ if (!ptr || *ptr != '-')
+ return 0;
+
+ /* Upper port parsing */
+ hp = (long) strtol(ptr, &ptr, 10);
+ if (hp < 1024 || hp > 65535)
+ return 0;
+ if (ptr)
+ return 0;
+
+ *lpout = (u_short) lp;
+ *hpout = (u_short) hp;
+ return 1;
+}
+
void
ipfw_config_nat(int ac, char **av)
{
ipfw_obj_header *oh;
struct nat44_cfg_nat *n; /* Nat instance configuration. */
int i, off, tok, ac1;
+ u_short lp, hp;
char *id, *buf, **av1, *end;
size_t len;
@@ -785,6 +811,7 @@
switch (tok) {
case TOK_IP:
case TOK_IF:
+ case TOK_PORT_ALIAS:
ac1--;
av1++;
break;
@@ -924,8 +951,22 @@
n->redir_cnt++;
off += i;
break;
+ case TOK_PORT_ALIAS:
+ if (ac == 0)
+ errx(EX_DATAERR, "missing option");
+ if (!nat_port_alias_parse(av[0], &lp, &hp))
+ errx(EX_DATAERR, "You ned a range of port(s) from 1024 <= x < 65536");
+ if (lp >= hp)
+ errx(EX_DATAERR, "upper port has to be greater than lower port");
+ n->alias_port_lo = lp;
+ n->alias_port_hi = hp;
+ ac--;
+ av++;
+ break;
}
}
+ if (n->mode & PKT_ALIAS_SAME_PORTS && n->alias_port_lo)
+ errx(EX_DATAERR, "same_ports and port_range cannot both be selected");
i = do_set3(IP_FW_NAT44_XCONFIG, &oh->opheader, len);
if (i != 0)
Index: sys/netinet/ip_fw.h
===================================================================
--- sys/netinet/ip_fw.h
+++ sys/netinet/ip_fw.h
@@ -550,6 +550,8 @@
struct in_addr ip; /* nat IPv4 address */
uint32_t mode; /* aliasing mode */
uint32_t redir_cnt; /* number of entry in spool chain */
+ u_short alias_port_lo; /* low range for port aliasing */
+ u_short alias_port_hi; /* high range for port aliasing */
};
/* Nat command. */
Index: sys/netinet/libalias/alias.h
===================================================================
--- sys/netinet/libalias/alias.h
+++ sys/netinet/libalias/alias.h
@@ -86,6 +86,7 @@
/* Initialization and control functions. */
struct libalias *LibAliasInit(struct libalias *);
void LibAliasSetAddress(struct libalias *, struct in_addr _addr);
+void LibAliasSetAliasPortRange(struct libalias *la, u_short port_low, u_short port_hi);
void LibAliasSetFWBase(struct libalias *, unsigned int _base, unsigned int _num);
void LibAliasSetSkinnyPort(struct libalias *, unsigned int _port);
unsigned int
Index: sys/netinet/libalias/alias_db.c
===================================================================
--- sys/netinet/libalias/alias_db.c
+++ sys/netinet/libalias/alias_db.c
@@ -605,6 +605,11 @@
*/
port_net = lnk->src_port;
port_sys = ntohs(port_net);
+ } else if (la->aliasPortLower) {
+ /* First trial is a random port in the aliasing range. */
+ port_sys = la->aliasPortLower +
+ (arc4random() % la->aliasPortLength);
+ port_net = htons(port_sys);
} else {
/* First trial and all subsequent are random. */
port_sys = arc4random() & ALIAS_PORT_MASK;
@@ -658,9 +663,15 @@
}
#endif
}
- port_sys = arc4random() & ALIAS_PORT_MASK;
- port_sys += ALIAS_PORT_BASE;
- port_net = htons(port_sys);
+ if (la->aliasPortLower) {
+ port_sys = la->aliasPortLower +
+ (arc4random() % la->aliasPortLength);
+ port_net = htons(port_sys);
+ } else {
+ port_sys = arc4random() & ALIAS_PORT_MASK;
+ port_sys += ALIAS_PORT_BASE;
+ port_net = htons(port_sys);
+ }
}
#ifdef LIBALIAS_DEBUG
@@ -2443,6 +2454,19 @@
CleanupAliasData(la);
la->aliasAddress = addr;
+ LIBALIAS_UNLOCK(la);
+}
+
+
+void
+LibAliasSetAliasPortRange(struct libalias *la, u_short port_low,
+ u_short port_high)
+{
+
+ LIBALIAS_LOCK(la);
+ la->aliasPortLower = port_low;
+ /* Add 1 to the aliasPortLength as modulo has range of 1 to n-1 */
+ la->aliasPortLength = port_high - port_low + 1;
LIBALIAS_UNLOCK(la);
}
Index: sys/netinet/libalias/alias_local.h
===================================================================
--- sys/netinet/libalias/alias_local.h
+++ sys/netinet/libalias/alias_local.h
@@ -163,6 +163,10 @@
struct in_addr true_addr; /* in network byte order. */
u_short true_port; /* in host byte order. */
+ /* Port ranges for aliasing. */
+ u_short aliasPortLower;
+ u_short aliasPortLength;
+
/*
* sctp code support
*/
Index: sys/netpfil/ipfw/ip_fw_nat.c
===================================================================
--- sys/netpfil/ipfw/ip_fw_nat.c
+++ sys/netpfil/ipfw/ip_fw_nat.c
@@ -93,6 +93,8 @@
/* chain of redir instances */
LIST_HEAD(redir_chain, cfg_redir) redir_chain;
char if_name[IF_NAMESIZE]; /* interface name */
+ u_short alias_port_lo; /* low range for port aliasing */
+ u_short alias_port_hi; /* high range for port aliasing */
};
static eventhandler_tag ifaddr_event_tag;
@@ -529,9 +531,12 @@
ptr->ip = ucfg->ip;
ptr->redir_cnt = ucfg->redir_cnt;
ptr->mode = ucfg->mode;
+ ptr->alias_port_lo = ucfg->alias_port_lo;
+ ptr->alias_port_hi = ucfg->alias_port_hi;
strlcpy(ptr->if_name, ucfg->if_name, sizeof(ptr->if_name));
LibAliasSetMode(ptr->lib, ptr->mode, ~0);
LibAliasSetAddress(ptr->lib, ptr->ip);
+ LibAliasSetAliasPortRange(ptr->lib, ptr->alias_port_lo, ptr->alias_port_hi);
/*
* Redir and LSNAT configuration.
@@ -659,6 +664,8 @@
ucfg->ip = ptr->ip;
ucfg->redir_cnt = ptr->redir_cnt;
ucfg->mode = ptr->mode;
+ ucfg->alias_port_lo = ptr->alias_port_lo;
+ ucfg->alias_port_hi = ptr->alias_port_hi;
strlcpy(ucfg->if_name, ptr->if_name, sizeof(ucfg->if_name));
}
Index: tests/sys/netpfil/common/nat.sh
===================================================================
--- tests/sys/netpfil/common/nat.sh
+++ tests/sys/netpfil/common/nat.sh
@@ -147,10 +147,107 @@
firewall_cleanup $firewall
}
+common_cgn() {
+ firewall=$1
+ portalias=$2
+ firewall_init $firewall
+ nat_init $firewall
+
+ epair_host_nat=$(vnet_mkepair)
+ epair_client1_nat=$(vnet_mkepair)
+ epair_client2_nat=$(vnet_mkepair)
+
+ vnet_mkjail nat ${epair_host_nat}b ${epair_client1_nat}a ${epair_client2_nat}a
+ vnet_mkjail client1 ${epair_client1_nat}b
+ vnet_mkjail client2 ${epair_client2_nat}b
+
+ ifconfig ${epair_host_nat}a 198.51.100.2/24 up
+ jexec nat ifconfig ${epair_host_nat}b 198.51.100.1/24 up
+
+ jexec nat ifconfig ${epair_client1_nat}a 100.64.0.1/24 up
+ jexec client1 ifconfig ${epair_client1_nat}b 100.64.0.2/24 up
+
+ jexec nat ifconfig ${epair_client2_nat}a 100.64.1.1/24 up
+ jexec client2 ifconfig ${epair_client2_nat}b 100.64.1.2/24 up
+
+ jexec nat sysctl net.inet.ip.forwarding=1
+
+ jexec client1 route add -net 198.51.100.0/24 100.64.0.1
+ jexec client2 route add -net 198.51.100.0/24 100.64.1.1
+
+ # ping fails without NAT configuration
+ atf_check -s exit:2 -o ignore jexec client1 ping -t 1 -c 1 198.51.100.2
+ atf_check -s exit:2 -o ignore jexec client2 ping -t 1 -c 1 198.51.100.2
+
+ if [[ $portalias ]]; then
+ firewall_config nat $firewall \
+ "ipfw" \
+ "ipfw -q nat 123 config if ${epair_host_nat}b unreg_cgn port_alias 2000-2999" \
+ "ipfw -q nat 456 config if ${epair_host_nat}b unreg_cgn port_alias 3000-3999" \
+ "ipfw -q add 1000 nat 123 all from any to 198.51.100.2 2000-2999 in via ${epair_host_nat}b" \
+ "ipfw -q add 2000 nat 456 all from any to 198.51.100.2 3000-3999 in via ${epair_host_nat}b" \
+ "ipfw -q add 3000 nat 123 all from 100.64.0.2 to any out via ${epair_host_nat}b" \
+ "ipfw -q add 4000 nat 456 all from 100.64.1.2 to any out via ${epair_host_nat}b"
+ else
+ firewall_config nat $firewall \
+ "ipfw" \
+ "ipfw -q nat 123 config if ${epair_host_nat}b unreg_cgn" \
+ "ipfw -q add 1000 nat 123 all from any to any"
+ fi
+
+ # ping is successful now
+ atf_check -s exit:0 -o ignore jexec client1 ping -t 1 -c 1 198.51.100.2
+ atf_check -s exit:0 -o ignore jexec client2 ping -t 1 -c 1 198.51.100.2
+
+ # if portalias, test a tcp server/client with nc
+ if [[ $portalias ]]; then
+ for inst in 1 2; do
+ daemon nc -p 198.51.100.2 7
+ atf_check -s exit:0 -o ignore jexec client$inst sh -c "echo | nc -N 198.51.100.2 7"
+ done
+ fi
+}
+
+cgn_head()
+{
+ atf_set descr 'IPv4 CGN (RFC 6598) test'
+ atf_set require.user root
+}
+
+cgn_body()
+{
+ common_cgn $1 false
+}
+
+cgn_cleanup()
+{
+ firewall_cleanup ipfw
+}
+
+portalias_head()
+{
+ atf_set descr 'IPv4 CGN (RFC 6598) port aliasing test'
+ atf_set require.user root
+}
+
+portalias_body()
+{
+ common_cgn $1 true
+}
+
+portalias_cleanup()
+{
+ firewall_cleanup ipfw
+}
+
setup_tests \
basic \
pf \
ipfw \
ipfnat \
userspace_nat \
- ipfw
\ No newline at end of file
+ ipfw \
+ cgn \
+ ipfw \
+ portalias \
+ ipfw

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