1 files changed, 555 insertions, 0 deletions
diff --git a/zebra/zebra_mpls_openbsd.c b/zebra/zebra_mpls_openbsd.c
new file mode 100644
index 0000000..5015f2e
--- /dev/null
+++ b/zebra/zebra_mpls_openbsd.c
@@ -0,0 +1,555 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Copyright (C) 2016 by Open Source Routing.
+ */
+
+#include <zebra.h>
+
+#ifdef OPEN_BSD
+
+#include <netmpls/mpls.h>
+#include "zebra/rt.h"
+#include "zebra/zebra_mpls.h"
+#include "zebra/debug.h"
+#include "zebra/zebra_errors.h"
+#include "zebra/zebra_router.h"
+
+#include "privs.h"
+#include "prefix.h"
+#include "interface.h"
+#include "log.h"
+#include "lib_errors.h"
+
+extern struct zebra_privs_t zserv_privs;
+
+struct {
+	uint32_t rtseq;
+	int fd;
+	int ioctl_fd;
+} kr_state;
+
+static int kernel_send_rtmsg_v4(int action, mpls_label_t in_label,
+				const struct zebra_nhlfe *nhlfe)
+{
+	struct iovec iov[5];
+	struct rt_msghdr hdr;
+	struct sockaddr_mpls sa_label_in, sa_label_out;
+	struct sockaddr_in nexthop;
+	int iovcnt = 0;
+	int ret;
+
+	if (IS_ZEBRA_DEBUG_KERNEL)
+		zlog_debug("%s: 0x%x, label=%u", __func__, action, in_label);
+
+	/* initialize header */
+	memset(&hdr, 0, sizeof(hdr));
+	hdr.rtm_version = RTM_VERSION;
+
+	hdr.rtm_type = action;
+	hdr.rtm_flags = RTF_UP;
+	hdr.rtm_fmask = RTF_MPLS;
+	hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */
+	hdr.rtm_msglen = sizeof(hdr);
+	hdr.rtm_hdrlen = sizeof(struct rt_msghdr);
+	hdr.rtm_priority = 0;
+	/* adjust iovec */
+	iov[iovcnt].iov_base = &hdr;
+	iov[iovcnt++].iov_len = sizeof(hdr);
+
+	/* in label */
+	memset(&sa_label_in, 0, sizeof(sa_label_in));
+	sa_label_in.smpls_len = sizeof(sa_label_in);
+	sa_label_in.smpls_family = AF_MPLS;
+	sa_label_in.smpls_label = htonl(in_label << MPLS_LABEL_OFFSET);
+	/* adjust header */
+	hdr.rtm_flags |= RTF_MPLS | RTF_MPATH;
+	hdr.rtm_addrs |= RTA_DST;
+	hdr.rtm_msglen += sizeof(sa_label_in);
+	/* adjust iovec */
+	iov[iovcnt].iov_base = &sa_label_in;
+	iov[iovcnt++].iov_len = sizeof(sa_label_in);
+
+	/* nexthop */
+	memset(&nexthop, 0, sizeof(nexthop));
+	nexthop.sin_len = sizeof(nexthop);
+	nexthop.sin_family = AF_INET;
+	nexthop.sin_addr = nhlfe->nexthop->gate.ipv4;
+	/* adjust header */
+	hdr.rtm_flags |= RTF_GATEWAY;
+	hdr.rtm_addrs |= RTA_GATEWAY;
+	hdr.rtm_msglen += sizeof(nexthop);
+	/* adjust iovec */
+	iov[iovcnt].iov_base = &nexthop;
+	iov[iovcnt++].iov_len = sizeof(nexthop);
+
+	/* If action is RTM_DELETE we have to get rid of MPLS infos */
+	if (action != RTM_DELETE) {
+		memset(&sa_label_out, 0, sizeof(sa_label_out));
+		sa_label_out.smpls_len = sizeof(sa_label_out);
+		sa_label_out.smpls_family = AF_MPLS;
+		sa_label_out.smpls_label =
+			htonl(nhlfe->nexthop->nh_label->label[0]
+			      << MPLS_LABEL_OFFSET);
+		/* adjust header */
+		hdr.rtm_addrs |= RTA_SRC;
+		hdr.rtm_flags |= RTF_MPLS;
+		hdr.rtm_msglen += sizeof(sa_label_out);
+		/* adjust iovec */
+		iov[iovcnt].iov_base = &sa_label_out;
+		iov[iovcnt++].iov_len = sizeof(sa_label_out);
+
+		if (nhlfe->nexthop->nh_label->label[0] == MPLS_LABEL_IMPLNULL)
+			hdr.rtm_mpls = MPLS_OP_POP;
+		else
+			hdr.rtm_mpls = MPLS_OP_SWAP;
+	}
+
+	frr_with_privs(&zserv_privs) {
+		ret = writev(kr_state.fd, iov, iovcnt);
+	}
+
+	if (ret == -1)
+		flog_err_sys(EC_LIB_SOCKET, "%s: %s", __func__,
+			     safe_strerror(errno));
+
+	return ret;
+}
+
+#if !defined(ROUNDUP)
+#define ROUNDUP(a)                                                             \
+	(((a) & (sizeof(long) - 1)) ? (1 + ((a) | (sizeof(long) - 1))) : (a))
+#endif
+
+static int kernel_send_rtmsg_v6(int action, mpls_label_t in_label,
+				const struct zebra_nhlfe *nhlfe)
+{
+	struct iovec iov[5];
+	struct rt_msghdr hdr;
+	struct sockaddr_mpls sa_label_in, sa_label_out;
+	struct pad {
+		struct sockaddr_in6 addr;
+		char pad[sizeof(long)]; /* thank you IPv6 */
+	} nexthop;
+	int iovcnt = 0;
+	int ret;
+
+	if (IS_ZEBRA_DEBUG_KERNEL)
+		zlog_debug("%s: 0x%x, label=%u", __func__, action, in_label);
+
+	/* initialize header */
+	memset(&hdr, 0, sizeof(hdr));
+	hdr.rtm_version = RTM_VERSION;
+
+	hdr.rtm_type = action;
+	hdr.rtm_flags = RTF_UP;
+	hdr.rtm_fmask = RTF_MPLS;
+	hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */
+	hdr.rtm_msglen = sizeof(hdr);
+	hdr.rtm_hdrlen = sizeof(struct rt_msghdr);
+	hdr.rtm_priority = 0;
+	/* adjust iovec */
+	iov[iovcnt].iov_base = &hdr;
+	iov[iovcnt++].iov_len = sizeof(hdr);
+
+	/* in label */
+	memset(&sa_label_in, 0, sizeof(sa_label_in));
+	sa_label_in.smpls_len = sizeof(sa_label_in);
+	sa_label_in.smpls_family = AF_MPLS;
+	sa_label_in.smpls_label = htonl(in_label << MPLS_LABEL_OFFSET);
+	/* adjust header */
+	hdr.rtm_flags |= RTF_MPLS | RTF_MPATH;
+	hdr.rtm_addrs |= RTA_DST;
+	hdr.rtm_msglen += sizeof(sa_label_in);
+	/* adjust iovec */
+	iov[iovcnt].iov_base = &sa_label_in;
+	iov[iovcnt++].iov_len = sizeof(sa_label_in);
+
+	/* nexthop */
+	memset(&nexthop, 0, sizeof(nexthop));
+	nexthop.addr.sin6_len = sizeof(struct sockaddr_in6);
+	nexthop.addr.sin6_family = AF_INET6;
+	nexthop.addr.sin6_addr = nhlfe->nexthop->gate.ipv6;
+	if (IN6_IS_ADDR_LINKLOCAL(&nexthop.addr.sin6_addr)) {
+		uint16_t tmp16;
+		struct sockaddr_in6 *sin6 = &nexthop.addr;
+
+		nexthop.addr.sin6_scope_id = nhlfe->nexthop->ifindex;
+
+		memcpy(&tmp16, &sin6->sin6_addr.s6_addr[2], sizeof(tmp16));
+		tmp16 = htons(sin6->sin6_scope_id);
+		memcpy(&sin6->sin6_addr.s6_addr[2], &tmp16, sizeof(tmp16));
+		sin6->sin6_scope_id = 0;
+	}
+
+	/* adjust header */
+	hdr.rtm_flags |= RTF_GATEWAY;
+	hdr.rtm_addrs |= RTA_GATEWAY;
+	hdr.rtm_msglen += ROUNDUP(sizeof(struct sockaddr_in6));
+	/* adjust iovec */
+	iov[iovcnt].iov_base = &nexthop;
+	iov[iovcnt++].iov_len = ROUNDUP(sizeof(struct sockaddr_in6));
+
+	/* If action is RTM_DELETE we have to get rid of MPLS infos */
+	if (action != RTM_DELETE) {
+		memset(&sa_label_out, 0, sizeof(sa_label_out));
+		sa_label_out.smpls_len = sizeof(sa_label_out);
+		sa_label_out.smpls_family = AF_MPLS;
+		sa_label_out.smpls_label =
+			htonl(nhlfe->nexthop->nh_label->label[0]
+			      << MPLS_LABEL_OFFSET);
+		/* adjust header */
+		hdr.rtm_addrs |= RTA_SRC;
+		hdr.rtm_flags |= RTF_MPLS;
+		hdr.rtm_msglen += sizeof(sa_label_out);
+		/* adjust iovec */
+		iov[iovcnt].iov_base = &sa_label_out;
+		iov[iovcnt++].iov_len = sizeof(sa_label_out);
+
+		if (nhlfe->nexthop->nh_label->label[0] == MPLS_LABEL_IMPLNULL)
+			hdr.rtm_mpls = MPLS_OP_POP;
+		else
+			hdr.rtm_mpls = MPLS_OP_SWAP;
+	}
+
+	frr_with_privs(&zserv_privs) {
+		ret = writev(kr_state.fd, iov, iovcnt);
+	}
+
+	if (ret == -1)
+		flog_err_sys(EC_LIB_SOCKET, "%s: %s", __func__,
+			     safe_strerror(errno));
+
+	return ret;
+}
+
+static int kernel_lsp_cmd(struct zebra_dplane_ctx *ctx)
+{
+	const struct nhlfe_list_head *head;
+	const struct zebra_nhlfe *nhlfe;
+	const struct nexthop *nexthop = NULL;
+	unsigned int nexthop_num = 0;
+	int action;
+
+	switch (dplane_ctx_get_op(ctx)) {
+	case DPLANE_OP_LSP_DELETE:
+		action = RTM_DELETE;
+		break;
+	case DPLANE_OP_LSP_INSTALL:
+		action = RTM_ADD;
+		break;
+	case DPLANE_OP_LSP_UPDATE:
+		action = RTM_CHANGE;
+		break;
+	case DPLANE_OP_NONE:
+	case DPLANE_OP_ROUTE_INSTALL:
+	case DPLANE_OP_ROUTE_UPDATE:
+	case DPLANE_OP_ROUTE_DELETE:
+	case DPLANE_OP_ROUTE_NOTIFY:
+	case DPLANE_OP_NH_INSTALL:
+	case DPLANE_OP_NH_UPDATE:
+	case DPLANE_OP_NH_DELETE:
+	case DPLANE_OP_LSP_NOTIFY:
+	case DPLANE_OP_PW_INSTALL:
+	case DPLANE_OP_PW_UNINSTALL:
+	case DPLANE_OP_SYS_ROUTE_ADD:
+	case DPLANE_OP_SYS_ROUTE_DELETE:
+	case DPLANE_OP_ADDR_INSTALL:
+	case DPLANE_OP_ADDR_UNINSTALL:
+	case DPLANE_OP_MAC_INSTALL:
+	case DPLANE_OP_MAC_DELETE:
+	case DPLANE_OP_NEIGH_INSTALL:
+	case DPLANE_OP_NEIGH_UPDATE:
+	case DPLANE_OP_NEIGH_DELETE:
+	case DPLANE_OP_VTEP_ADD:
+	case DPLANE_OP_VTEP_DELETE:
+	case DPLANE_OP_RULE_ADD:
+	case DPLANE_OP_RULE_DELETE:
+	case DPLANE_OP_RULE_UPDATE:
+	case DPLANE_OP_NEIGH_DISCOVER:
+	case DPLANE_OP_BR_PORT_UPDATE:
+	case DPLANE_OP_IPTABLE_ADD:
+	case DPLANE_OP_IPTABLE_DELETE:
+	case DPLANE_OP_IPSET_ADD:
+	case DPLANE_OP_IPSET_DELETE:
+	case DPLANE_OP_IPSET_ENTRY_ADD:
+	case DPLANE_OP_IPSET_ENTRY_DELETE:
+	case DPLANE_OP_NEIGH_IP_INSTALL:
+	case DPLANE_OP_NEIGH_IP_DELETE:
+	case DPLANE_OP_NEIGH_TABLE_UPDATE:
+	case DPLANE_OP_GRE_SET:
+	case DPLANE_OP_INTF_ADDR_ADD:
+	case DPLANE_OP_INTF_ADDR_DEL:
+	case DPLANE_OP_INTF_NETCONFIG:
+	case DPLANE_OP_INTF_INSTALL:
+	case DPLANE_OP_INTF_UPDATE:
+	case DPLANE_OP_INTF_DELETE:
+	case DPLANE_OP_TC_QDISC_INSTALL:
+	case DPLANE_OP_TC_QDISC_UNINSTALL:
+	case DPLANE_OP_TC_CLASS_ADD:
+	case DPLANE_OP_TC_CLASS_DELETE:
+	case DPLANE_OP_TC_CLASS_UPDATE:
+	case DPLANE_OP_TC_FILTER_ADD:
+	case DPLANE_OP_TC_FILTER_DELETE:
+	case DPLANE_OP_TC_FILTER_UPDATE:
+	case DPLANE_OP_STARTUP_STAGE:
+		return -1;
+	}
+
+	head = dplane_ctx_get_nhlfe_list(ctx);
+	frr_each(nhlfe_list_const, head, nhlfe) {
+		nexthop = nhlfe->nexthop;
+		if (!nexthop)
+			continue;
+
+		if (nexthop_num >= zrouter.multipath_num)
+			break;
+
+		if (((action == RTM_ADD || action == RTM_CHANGE)
+		     && (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED)
+			 && CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE)))
+		    || (action == RTM_DELETE
+			&& (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED)
+			    && CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB)))) {
+			if (nhlfe->nexthop->nh_label->num_labels > 1) {
+				flog_warn(EC_ZEBRA_MAX_LABELS_PUSH,
+					  "%s: can't push %u labels at once (maximum is 1)",
+					  __func__,
+					  nhlfe->nexthop->nh_label->num_labels);
+				continue;
+			}
+
+			nexthop_num++;
+
+			switch (NHLFE_FAMILY(nhlfe)) {
+			case AF_INET:
+				kernel_send_rtmsg_v4(
+					action,
+					dplane_ctx_get_in_label(ctx),
+					nhlfe);
+				break;
+			case AF_INET6:
+				kernel_send_rtmsg_v6(
+					action,
+					dplane_ctx_get_in_label(ctx),
+					nhlfe);
+				break;
+			default:
+				break;
+			}
+		}
+	}
+
+	return 0;
+}
+
+enum zebra_dplane_result kernel_lsp_update(struct zebra_dplane_ctx *ctx)
+{
+	int ret;
+
+	ret = kernel_lsp_cmd(ctx);
+
+	return (ret == 0 ?
+		ZEBRA_DPLANE_REQUEST_SUCCESS : ZEBRA_DPLANE_REQUEST_FAILURE);
+}
+
+static enum zebra_dplane_result kmpw_install(struct zebra_dplane_ctx *ctx)
+{
+	struct ifreq ifr;
+	struct ifmpwreq imr;
+	struct sockaddr_storage ss;
+	struct sockaddr_in *sa_in = (struct sockaddr_in *)&ss;
+	struct sockaddr_in6 *sa_in6 = (struct sockaddr_in6 *)&ss;
+	const union g_addr *gaddr;
+
+	memset(&imr, 0, sizeof(imr));
+	switch (dplane_ctx_get_pw_type(ctx)) {
+	case PW_TYPE_ETHERNET:
+		imr.imr_type = IMR_TYPE_ETHERNET;
+		break;
+	case PW_TYPE_ETHERNET_TAGGED:
+		imr.imr_type = IMR_TYPE_ETHERNET_TAGGED;
+		break;
+	default:
+		zlog_debug("%s: unhandled pseudowire type (%#X)", __func__,
+			   dplane_ctx_get_pw_type(ctx));
+		return ZEBRA_DPLANE_REQUEST_FAILURE;
+	}
+
+	if (dplane_ctx_get_pw_flags(ctx) & F_PSEUDOWIRE_CWORD)
+		imr.imr_flags |= IMR_FLAG_CONTROLWORD;
+
+	/* pseudowire nexthop */
+	memset(&ss, 0, sizeof(ss));
+	gaddr = dplane_ctx_get_pw_dest(ctx);
+	switch (dplane_ctx_get_pw_af(ctx)) {
+	case AF_INET:
+		sa_in->sin_family = AF_INET;
+		sa_in->sin_len = sizeof(struct sockaddr_in);
+		sa_in->sin_addr = gaddr->ipv4;
+		break;
+	case AF_INET6:
+		sa_in6->sin6_family = AF_INET6;
+		sa_in6->sin6_len = sizeof(struct sockaddr_in6);
+		sa_in6->sin6_addr = gaddr->ipv6;
+		break;
+	default:
+		zlog_debug("%s: unhandled pseudowire address-family (%u)",
+			   __func__, dplane_ctx_get_pw_af(ctx));
+		return ZEBRA_DPLANE_REQUEST_FAILURE;
+	}
+	memcpy(&imr.imr_nexthop, (struct sockaddr *)&ss,
+	       sizeof(imr.imr_nexthop));
+
+	/* pseudowire local/remote labels */
+	imr.imr_lshim.shim_label = dplane_ctx_get_pw_local_label(ctx);
+	imr.imr_rshim.shim_label = dplane_ctx_get_pw_remote_label(ctx);
+
+	/* ioctl */
+	memset(&ifr, 0, sizeof(ifr));
+	strlcpy(ifr.ifr_name, dplane_ctx_get_ifname(ctx),
+		sizeof(ifr.ifr_name));
+	ifr.ifr_data = (caddr_t)&imr;
+	if (ioctl(kr_state.ioctl_fd, SIOCSETMPWCFG, &ifr) == -1) {
+		flog_err_sys(EC_LIB_SYSTEM_CALL, "ioctl SIOCSETMPWCFG: %s",
+			     safe_strerror(errno));
+		return ZEBRA_DPLANE_REQUEST_FAILURE;
+	}
+
+	return ZEBRA_DPLANE_REQUEST_SUCCESS;
+}
+
+static enum zebra_dplane_result kmpw_uninstall(struct zebra_dplane_ctx *ctx)
+{
+	struct ifreq ifr;
+	struct ifmpwreq imr;
+
+	memset(&ifr, 0, sizeof(ifr));
+	memset(&imr, 0, sizeof(imr));
+	strlcpy(ifr.ifr_name, dplane_ctx_get_ifname(ctx),
+		sizeof(ifr.ifr_name));
+	ifr.ifr_data = (caddr_t)&imr;
+	if (ioctl(kr_state.ioctl_fd, SIOCSETMPWCFG, &ifr) == -1) {
+		flog_err_sys(EC_LIB_SYSTEM_CALL, "ioctl SIOCSETMPWCFG: %s",
+			     safe_strerror(errno));
+		return ZEBRA_DPLANE_REQUEST_FAILURE;
+	}
+
+	return ZEBRA_DPLANE_REQUEST_SUCCESS;
+}
+
+/*
+ * Pseudowire update api for openbsd.
+ */
+enum zebra_dplane_result kernel_pw_update(struct zebra_dplane_ctx *ctx)
+{
+	enum zebra_dplane_result result = ZEBRA_DPLANE_REQUEST_FAILURE;
+
+	switch (dplane_ctx_get_op(ctx)) {
+	case DPLANE_OP_PW_INSTALL:
+		result = kmpw_install(ctx);
+		break;
+	case DPLANE_OP_PW_UNINSTALL:
+		result = kmpw_uninstall(ctx);
+		break;
+	case DPLANE_OP_NONE:
+	case DPLANE_OP_ROUTE_INSTALL:
+	case DPLANE_OP_ROUTE_UPDATE:
+	case DPLANE_OP_ROUTE_DELETE:
+	case DPLANE_OP_ROUTE_NOTIFY:
+	case DPLANE_OP_NH_INSTALL:
+	case DPLANE_OP_NH_UPDATE:
+	case DPLANE_OP_NH_DELETE:
+	case DPLANE_OP_LSP_INSTALL:
+	case DPLANE_OP_LSP_UPDATE:
+	case DPLANE_OP_LSP_DELETE:
+	case DPLANE_OP_LSP_NOTIFY:
+	case DPLANE_OP_SYS_ROUTE_ADD:
+	case DPLANE_OP_SYS_ROUTE_DELETE:
+	case DPLANE_OP_ADDR_INSTALL:
+	case DPLANE_OP_ADDR_UNINSTALL:
+	case DPLANE_OP_MAC_INSTALL:
+	case DPLANE_OP_MAC_DELETE:
+	case DPLANE_OP_NEIGH_INSTALL:
+	case DPLANE_OP_NEIGH_UPDATE:
+	case DPLANE_OP_NEIGH_DELETE:
+	case DPLANE_OP_VTEP_ADD:
+	case DPLANE_OP_VTEP_DELETE:
+	case DPLANE_OP_RULE_ADD:
+	case DPLANE_OP_RULE_DELETE:
+	case DPLANE_OP_RULE_UPDATE:
+	case DPLANE_OP_NEIGH_DISCOVER:
+	case DPLANE_OP_BR_PORT_UPDATE:
+	case DPLANE_OP_IPTABLE_ADD:
+	case DPLANE_OP_IPTABLE_DELETE:
+	case DPLANE_OP_IPSET_ADD:
+	case DPLANE_OP_IPSET_DELETE:
+	case DPLANE_OP_IPSET_ENTRY_ADD:
+	case DPLANE_OP_IPSET_ENTRY_DELETE:
+	case DPLANE_OP_NEIGH_IP_INSTALL:
+	case DPLANE_OP_NEIGH_IP_DELETE:
+	case DPLANE_OP_NEIGH_TABLE_UPDATE:
+	case DPLANE_OP_GRE_SET:
+	case DPLANE_OP_INTF_ADDR_ADD:
+	case DPLANE_OP_INTF_ADDR_DEL:
+	case DPLANE_OP_INTF_NETCONFIG:
+	case DPLANE_OP_INTF_INSTALL:
+	case DPLANE_OP_INTF_UPDATE:
+	case DPLANE_OP_INTF_DELETE:
+	case DPLANE_OP_TC_QDISC_INSTALL:
+	case DPLANE_OP_TC_QDISC_UNINSTALL:
+	case DPLANE_OP_TC_CLASS_ADD:
+	case DPLANE_OP_TC_CLASS_DELETE:
+	case DPLANE_OP_TC_CLASS_UPDATE:
+	case DPLANE_OP_TC_FILTER_ADD:
+	case DPLANE_OP_TC_FILTER_DELETE:
+	case DPLANE_OP_TC_FILTER_UPDATE:
+	case DPLANE_OP_STARTUP_STAGE:
+		break;
+	}
+
+	return result;
+}
+
+#define MAX_RTSOCK_BUF	128 * 1024
+int mpls_kernel_init(void)
+{
+	int rcvbuf, default_rcvbuf;
+	socklen_t optlen;
+
+	if ((kr_state.fd = socket(AF_ROUTE, SOCK_RAW, 0)) == -1) {
+		flog_err_sys(EC_LIB_SOCKET, "%s: socket", __func__);
+		return -1;
+	}
+
+	if ((kr_state.ioctl_fd = socket(AF_INET, SOCK_DGRAM | SOCK_NONBLOCK, 0))
+	    == -1) {
+		flog_err_sys(EC_LIB_SOCKET, "%s: ioctl socket", __func__);
+		return -1;
+	}
+
+	/* grow receive buffer, don't wanna miss messages */
+	optlen = sizeof(default_rcvbuf);
+	if (getsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, &default_rcvbuf,
+		       &optlen)
+	    == -1)
+		flog_err_sys(EC_LIB_SOCKET,
+			     "kr_init getsockopt SOL_SOCKET SO_RCVBUF");
+	else
+		for (rcvbuf = MAX_RTSOCK_BUF;
+		     rcvbuf > default_rcvbuf
+		     && setsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf,
+				   sizeof(rcvbuf))
+				== -1
+		     && errno == ENOBUFS;
+		     rcvbuf /= 2)
+			; /* nothing */
+
+	kr_state.rtseq = 1;
+
+	/* Strict pseudowire reachability checking required for obsd */
+	mpls_pw_reach_strict = true;
+
+	return 0;
+}
+
+#endif /* OPEN_BSD */