Date: Tue, 2 Feb 2021 21:25:48 GMT From: Neel Chauhan <nc@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: a08cdb6cfb1c - main - Allow setting alias port ranges in libalias and ipfw. This will allow a system to be a true RFC 6598 NAT444 setup, where each network segment (e.g. user, subnet) can have their own dedicated port aliasing ranges. Message-ID: <202102022125.112LPmxr058817@gitrepo.freebsd.org>
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The branch main has been updated by nc (ports committer): URL: https://cgit.FreeBSD.org/src/commit/?id=a08cdb6cfb1c84b80b5337d46c574b55d0e15c63 commit a08cdb6cfb1c84b80b5337d46c574b55d0e15c63 Author: Neel Chauhan <nc@FreeBSD.org> AuthorDate: 2021-02-02 21:24:17 +0000 Commit: Neel Chauhan <nc@FreeBSD.org> CommitDate: 2021-02-02 21:24:17 +0000 Allow setting alias port ranges in libalias and ipfw. This will allow a system to be a true RFC 6598 NAT444 setup, where each network segment (e.g. user, subnet) can have their own dedicated port aliasing ranges. Reviewed by: donner, kp Approved by: 0mp (mentor), donner, kp Differential Revision: https://reviews.freebsd.org/D23450 --- sbin/ipfw/ipfw.8 | 3 ++ sbin/ipfw/ipfw2.h | 1 + sbin/ipfw/main.c | 3 +- sbin/ipfw/nat.c | 41 ++++++++++++++++ sys/netinet/ip_fw.h | 2 + sys/netinet/libalias/alias.h | 1 + sys/netinet/libalias/alias_db.c | 30 ++++++++++-- sys/netinet/libalias/alias_local.h | 4 ++ sys/netpfil/ipfw/ip_fw_nat.c | 7 +++ tests/sys/netpfil/common/nat.sh | 99 +++++++++++++++++++++++++++++++++++++- 10 files changed, 186 insertions(+), 5 deletions(-) diff --git a/sbin/ipfw/ipfw.8 b/sbin/ipfw/ipfw.8 index e77930355094..d2c4885bc119 100644 --- a/sbin/ipfw/ipfw.8 +++ b/sbin/ipfw/ipfw.8 @@ -3271,6 +3271,9 @@ Reverse the way libalias handles aliasing. 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 diff --git a/sbin/ipfw/ipfw2.h b/sbin/ipfw/ipfw2.h index 764e5176e8ef..42e4f4777792 100644 --- a/sbin/ipfw/ipfw2.h +++ b/sbin/ipfw/ipfw2.h @@ -285,6 +285,7 @@ enum tokens { TOK_STATES_CHUNKS, TOK_JMAXLEN, TOK_PORT_RANGE, + TOK_PORT_ALIAS, TOK_HOST_DEL_AGE, TOK_PG_DEL_AGE, TOK_TCP_SYN_AGE, diff --git a/sbin/ipfw/main.c b/sbin/ipfw/main.c index dc55d0bfa416..89f21062811c 100644 --- a/sbin/ipfw/main.c +++ b/sbin/ipfw/main.c @@ -45,7 +45,8 @@ help(void) "[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" diff --git a/sbin/ipfw/nat.c b/sbin/ipfw/nat.c index bbf5be666ea0..1076e1038b8a 100644 --- a/sbin/ipfw/nat.c +++ b/sbin/ipfw/nat.c @@ -65,6 +65,7 @@ static struct _s_x nat_params[] = { { "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 }, @@ -753,12 +754,35 @@ nat_show_cfg(struct nat44_cfg_nat *n, void *arg __unused) 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; @@ -786,6 +810,7 @@ ipfw_config_nat(int ac, char **av) switch (tok) { case TOK_IP: case TOK_IF: + case TOK_PORT_ALIAS: ac1--; av1++; break; @@ -925,8 +950,24 @@ ipfw_config_nat(int ac, char **av) 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 need 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) diff --git a/sys/netinet/ip_fw.h b/sys/netinet/ip_fw.h index f0531a67132d..4d3099a781a0 100644 --- a/sys/netinet/ip_fw.h +++ b/sys/netinet/ip_fw.h @@ -549,6 +549,8 @@ struct nat44_cfg_nat { 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. */ diff --git a/sys/netinet/libalias/alias.h b/sys/netinet/libalias/alias.h index 671241212799..91351a9eb8b9 100644 --- a/sys/netinet/libalias/alias.h +++ b/sys/netinet/libalias/alias.h @@ -86,6 +86,7 @@ struct alias_link; /* 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 diff --git a/sys/netinet/libalias/alias_db.c b/sys/netinet/libalias/alias_db.c index 8da9a7fe683a..1f85a606b2d5 100644 --- a/sys/netinet/libalias/alias_db.c +++ b/sys/netinet/libalias/alias_db.c @@ -595,6 +595,11 @@ GetNewPort(struct libalias *la, struct alias_link *lnk, int alias_port_param) */ 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; @@ -647,9 +652,15 @@ GetNewPort(struct libalias *la, struct alias_link *lnk, int alias_port_param) } #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 @@ -2381,6 +2392,19 @@ LibAliasSetAddress(struct libalias *la, struct in_addr 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); +} + void LibAliasSetTarget(struct libalias *la, struct in_addr target_addr) { diff --git a/sys/netinet/libalias/alias_local.h b/sys/netinet/libalias/alias_local.h index 5919851a4019..ba128638c1fe 100644 --- a/sys/netinet/libalias/alias_local.h +++ b/sys/netinet/libalias/alias_local.h @@ -163,6 +163,10 @@ struct libalias { 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 */ diff --git a/sys/netpfil/ipfw/ip_fw_nat.c b/sys/netpfil/ipfw/ip_fw_nat.c index 81229b2707e9..bcda3cff011c 100644 --- a/sys/netpfil/ipfw/ip_fw_nat.c +++ b/sys/netpfil/ipfw/ip_fw_nat.c @@ -93,6 +93,8 @@ struct cfg_nat { /* 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; @@ -528,9 +530,12 @@ nat44_config(struct ip_fw_chain *chain, struct nat44_cfg_nat *ucfg) 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. @@ -658,6 +663,8 @@ export_nat_cfg(struct cfg_nat *ptr, struct nat44_cfg_nat *ucfg) 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)); } diff --git a/tests/sys/netpfil/common/nat.sh b/tests/sys/netpfil/common/nat.sh index f74467dce062..9aa06de51337 100644 --- a/tests/sys/netpfil/common/nat.sh +++ b/tests/sys/netpfil/common/nat.sh @@ -147,10 +147,107 @@ userspace_nat_cleanup() 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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