Date: Fri, 24 Jan 2020 20:35:41 +0000 (UTC) From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r357092 - in head: sbin/ipfw sys/netinet/libalias Message-ID: <202001242035.00OKZfjA079882@repo.freebsd.org>
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Author: melifaro Date: Fri Jan 24 20:35:41 2020 New Revision: 357092 URL: https://svnweb.freebsd.org/changeset/base/357092 Log: Add support for RFC 6598/Carrier Grade NAT subnets. to libalias and ipfw. In libalias, a new flag PKT_ALIAS_UNREGISTERED_RFC6598 is added. This is like PKT_ALIAS_UNREGISTERED_ONLY, but also is RFC 6598 aware. Also, we add a new NAT option to ipfw called unreg_cgn, which is like unreg_only, but also is RFC 6598-aware. The reason for the new flags/options is to avoid breaking existing networks, especially those which rely on RFC 6598 as an external address. Submitted by: Neel Chauhan <neel AT neelc DOT org> MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D22877 Modified: head/sbin/ipfw/ipfw.8 head/sbin/ipfw/ipfw2.h head/sbin/ipfw/main.c head/sbin/ipfw/nat.c head/sys/netinet/libalias/alias.c head/sys/netinet/libalias/alias.h head/sys/netinet/libalias/libalias.3 Modified: head/sbin/ipfw/ipfw.8 ============================================================================== --- head/sbin/ipfw/ipfw.8 Fri Jan 24 19:42:53 2020 (r357091) +++ head/sbin/ipfw/ipfw.8 Fri Jan 24 20:35:41 2020 (r357092) @@ -3233,8 +3233,11 @@ Deny any incoming connection from outside world. Try to leave the alias port numbers unchanged from the actual local port numbers. .It Cm unreg_only -Traffic on the local network not originating from an +Traffic on the local network not originating from a RFC 1918 unregistered address spaces will be ignored. +.It Cm unreg_cgn +Like unreg_only, but includes the RFC 6598 (Carrier Grade NAT) +address range. .It Cm reset Reset table of the packet aliasing engine on address change. .It Cm reverse Modified: head/sbin/ipfw/ipfw2.h ============================================================================== --- head/sbin/ipfw/ipfw2.h Fri Jan 24 19:42:53 2020 (r357091) +++ head/sbin/ipfw/ipfw2.h Fri Jan 24 20:35:41 2020 (r357092) @@ -220,6 +220,7 @@ enum tokens { TOK_DENY_INC, TOK_SAME_PORTS, TOK_UNREG_ONLY, + TOK_UNREG_CGN, TOK_SKIP_GLOBAL, TOK_RESET_ADDR, TOK_ALIAS_REV, Modified: head/sbin/ipfw/main.c ============================================================================== --- head/sbin/ipfw/main.c Fri Jan 24 19:42:53 2020 (r357091) +++ head/sbin/ipfw/main.c Fri Jan 24 20:35:41 2020 (r357092) @@ -43,8 +43,8 @@ help(void) "add [num] [set N] [prob x] RULE-BODY\n" "{pipe|queue} N config PIPE-BODY\n" "[pipe|queue] {zero|delete|show} [N{,N}]\n" -"nat N config {ip IPADDR|if IFNAME|log|deny_in|same_ports|unreg_only|reset|\n" -" reverse|proxy_only|redirect_addr linkspec|\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" "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" Modified: head/sbin/ipfw/nat.c ============================================================================== --- head/sbin/ipfw/nat.c Fri Jan 24 19:42:53 2020 (r357091) +++ head/sbin/ipfw/nat.c Fri Jan 24 20:35:41 2020 (r357092) @@ -60,6 +60,7 @@ static struct _s_x nat_params[] = { { "deny_in", TOK_DENY_INC }, { "same_ports", TOK_SAME_PORTS }, { "unreg_only", TOK_UNREG_ONLY }, + { "unreg_cgn", TOK_UNREG_CGN }, { "skip_global", TOK_SKIP_GLOBAL }, { "reset", TOK_RESET_ADDR }, { "reverse", TOK_ALIAS_REV }, @@ -663,6 +664,9 @@ nat_show_cfg(struct nat44_cfg_nat *n, void *arg) } else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) { printf(" unreg_only"); n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY; + } else if (n->mode & PKT_ALIAS_UNREGISTERED_CGN) { + printf(" unreg_cgn"); + n->mode &= ~PKT_ALIAS_UNREGISTERED_CGN; } else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) { printf(" reset"); n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE; Modified: head/sys/netinet/libalias/alias.c ============================================================================== --- head/sys/netinet/libalias/alias.c Fri Jan 24 19:42:53 2020 (r357091) +++ head/sys/netinet/libalias/alias.c Fri Jan 24 20:35:41 2020 (r357092) @@ -1413,6 +1413,10 @@ getout: #define UNREG_ADDR_C_LOWER 0xc0a80000 #define UNREG_ADDR_C_UPPER 0xc0a8ffff +/* 100.64.0.0 -> 100.127.255.255 (RFC 6598 - Carrier Grade NAT) */ +#define UNREG_ADDR_CGN_LOWER 0x64400000 +#define UNREG_ADDR_CGN_UPPER 0x647fffff + int LibAliasOut(struct libalias *la, char *ptr, int maxpacketsize) { @@ -1464,7 +1468,8 @@ LibAliasOutLocked(struct libalias *la, char *ptr, /* v } addr_save = GetDefaultAliasAddress(la); - if (la->packetAliasMode & PKT_ALIAS_UNREGISTERED_ONLY) { + if (la->packetAliasMode & PKT_ALIAS_UNREGISTERED_ONLY || + la->packetAliasMode & PKT_ALIAS_UNREGISTERED_CGN) { u_long addr; int iclass; @@ -1476,6 +1481,9 @@ LibAliasOutLocked(struct libalias *la, char *ptr, /* v iclass = 2; else if (addr >= UNREG_ADDR_A_LOWER && addr <= UNREG_ADDR_A_UPPER) iclass = 1; + else if (addr >= UNREG_ADDR_CGN_LOWER && addr <= UNREG_ADDR_CGN_UPPER && + la->packetAliasMode & PKT_ALIAS_UNREGISTERED_CGN) + iclass = 4; if (iclass == 0) { SetDefaultAliasAddress(la, pip->ip_src); Modified: head/sys/netinet/libalias/alias.h ============================================================================== --- head/sys/netinet/libalias/alias.h Fri Jan 24 19:42:53 2020 (r357091) +++ head/sys/netinet/libalias/alias.h Fri Jan 24 20:35:41 2020 (r357092) @@ -228,6 +228,14 @@ struct mbuf *m_megapullup(struct mbuf *, int); */ #define PKT_ALIAS_SKIP_GLOBAL 0x200 +/* + * Like PKT_ALIAS_UNREGISTERED_ONLY, but includes the RFC 6598 + * (Carrier Grade NAT) address range as follows: + * + * 100.64.0.0 -> 100.127.255.255 + */ +#define PKT_ALIAS_UNREGISTERED_CGN 0x400 + /* Function return codes. */ #define PKT_ALIAS_ERROR -1 #define PKT_ALIAS_OK 1 Modified: head/sys/netinet/libalias/libalias.3 ============================================================================== --- head/sys/netinet/libalias/libalias.3 Fri Jan 24 19:42:53 2020 (r357091) +++ head/sys/netinet/libalias/libalias.3 Fri Jan 24 20:35:41 2020 (r357092) @@ -212,6 +212,11 @@ This option is useful in the case that the packet alia registered and unregistered subnets on different interfaces. The registered subnet is fully accessible to the outside world, so traffic from it does not need to be passed through the packet aliasing engine. +.It Dv PKT_ALIAS_UNREGISTERED_CGN +Like PKT_ALIAS_UNREGISTERED_ONLY, but includes the RFC 6598 (Carrier Grade +NAT) subnet as follows: +.Pp +100.64.0.0 -> 100.127.255.255 (RFC 6598 subnet) .It Dv PKT_ALIAS_RESET_ON_ADDR_CHANGE When this mode bit is set and .Fn LibAliasSetAddress
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