[mirror_frr.git] / zebra / zebra_mpls_openbsd.c

/*
 * Copyright (C) 2016 by Open Source Routing.
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#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 "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,
				zebra_nhlfe_t *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_elevate_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,
				zebra_nhlfe_t *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_elevate_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(int action, zebra_lsp_t *lsp)
{
	zebra_nhlfe_t *nhlfe;
	struct nexthop *nexthop = NULL;
	unsigned int nexthop_num = 0;

	for (nhlfe = lsp->nhlfe_list; nhlfe; nhlfe = nhlfe->next) {
		nexthop = nhlfe->nexthop;
		if (!nexthop)
			continue;

		if (nexthop_num >= 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, lsp->ile.in_label,
						     nhlfe);
				break;
			case AF_INET6:
				kernel_send_rtmsg_v6(action, lsp->ile.in_label,
						     nhlfe);
				break;
			default:
				break;
			}
		}
	}

	return (0);
}

enum zebra_dplane_result kernel_add_lsp(zebra_lsp_t *lsp)
{
	int ret;

	if (!lsp || !lsp->best_nhlfe) { // unexpected
		kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_INSTALL_FAILURE);
		return ZEBRA_DPLANE_REQUEST_FAILURE;
	}

	ret = kernel_lsp_cmd(RTM_ADD, lsp);

	kernel_lsp_pass_fail(lsp,
			     (!ret) ? ZEBRA_DPLANE_INSTALL_SUCCESS
				    : ZEBRA_DPLANE_INSTALL_FAILURE);

	return ZEBRA_DPLANE_REQUEST_SUCCESS;
}

enum zebra_dplane_result kernel_upd_lsp(zebra_lsp_t *lsp)
{
	int ret;

	if (!lsp || !lsp->best_nhlfe) { // unexpected
		kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_INSTALL_FAILURE);
		return ZEBRA_DPLANE_REQUEST_FAILURE;
	}

	ret = kernel_lsp_cmd(RTM_CHANGE, lsp);

	kernel_lsp_pass_fail(lsp,
			     (!ret) ? ZEBRA_DPLANE_INSTALL_SUCCESS
				    : ZEBRA_DPLANE_INSTALL_FAILURE);
	return ZEBRA_DPLANE_REQUEST_SUCCESS;
}

enum zebra_dplane_result kernel_del_lsp(zebra_lsp_t *lsp)
{
	int ret;

	if (!lsp) { // unexpected
		kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_DELETE_FAILURE);
		return ZEBRA_DPLANE_REQUEST_FAILURE;
	}

	if (!CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) {
		kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_DELETE_FAILURE);
		return ZEBRA_DPLANE_REQUEST_FAILURE;
	}

	ret = kernel_lsp_cmd(RTM_DELETE, lsp);

	kernel_lsp_pass_fail(lsp,
			     (!ret) ? ZEBRA_DPLANE_DELETE_SUCCESS
				    : ZEBRA_DPLANE_DELETE_FAILURE);

	return ZEBRA_DPLANE_REQUEST_SUCCESS;
}

static int kmpw_install(struct zebra_pw *pw)
{
	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;

	memset(&imr, 0, sizeof(imr));
	switch (pw->type) {
	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__,
			   pw->type);
		return -1;
	}

	if (pw->flags & F_PSEUDOWIRE_CWORD)
		imr.imr_flags |= IMR_FLAG_CONTROLWORD;

	/* pseudowire nexthop */
	memset(&ss, 0, sizeof(ss));
	switch (pw->af) {
	case AF_INET:
		sa_in->sin_family = AF_INET;
		sa_in->sin_len = sizeof(struct sockaddr_in);
		sa_in->sin_addr = pw->nexthop.ipv4;
		break;
	case AF_INET6:
		sa_in6->sin6_family = AF_INET6;
		sa_in6->sin6_len = sizeof(struct sockaddr_in6);
		sa_in6->sin6_addr = pw->nexthop.ipv6;
		break;
	default:
		zlog_debug("%s: unhandled pseudowire address-family (%u)",
			   __func__, pw->af);
		return -1;
	}
	memcpy(&imr.imr_nexthop, (struct sockaddr *)&ss,
	       sizeof(imr.imr_nexthop));

	/* pseudowire local/remote labels */
	imr.imr_lshim.shim_label = pw->local_label;
	imr.imr_rshim.shim_label = pw->remote_label;

	/* ioctl */
	memset(&ifr, 0, sizeof(ifr));
	strlcpy(ifr.ifr_name, pw->ifname, 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 -1;
	}

	return 0;
}

static int kmpw_uninstall(struct zebra_pw *pw)
{
	struct ifreq ifr;
	struct ifmpwreq imr;

	memset(&ifr, 0, sizeof(ifr));
	memset(&imr, 0, sizeof(imr));
	strlcpy(ifr.ifr_name, pw->ifname, 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 -1;
	}

	return 0;
}

#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;

	/* register hook to install/uninstall pseudowires */
	hook_register(pw_install, kmpw_install);
	hook_register(pw_uninstall, kmpw_uninstall);

	return 0;
}

#endif /* OPEN_BSD */
Commit	Line	Data
7fc02572 RW	1	/*
	2	* Copyright (C) 2016 by Open Source Routing.
	3	*
	4	* This file is part of GNU Zebra.
	5	*
	6	* GNU Zebra is free software; you can redistribute it and/or modify it
	7	* under the terms of the GNU General Public License as published by the
	8	* Free Software Foundation; either version 2, or (at your option) any
	9	* later version.
	10	*
	11	* GNU Zebra is distributed in the hope that it will be useful, but
	12	* WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* General Public License for more details.
	15	*
896014f4 DL	16	* You should have received a copy of the GNU General Public License along
	17	* with this program; see the file COPYING; if not, write to the Free Software
	18	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
7fc02572 RW	19	*/
7fc02572 RW	20
d3e2c74a	21	#include <zebra.h>
ddfeb486 DL	22
	23	#ifdef OPEN_BSD
	24
d3e2c74a RW	25	#include <netmpls/mpls.h>
	26	#include "zebra/rt.h"
	27	#include "zebra/zebra_mpls.h"
	28	#include "zebra/debug.h"
364fed6b	29	#include "zebra/zebra_errors.h"
d3e2c74a RW	30
	31	#include "privs.h"
	32	#include "prefix.h"
	33	#include "interface.h"
	34	#include "log.h"
174482ef	35	#include "lib_errors.h"
d3e2c74a RW	36
	37	extern struct zebra_privs_t zserv_privs;
	38
	39	struct {
d7c0a89a	40	uint32_t rtseq;
d62a17ae	41	int fd;
d42127da	42	int ioctl_fd;
d3e2c74a RW	43	} kr_state;
d3e2c74a RW	44
d62a17ae	45	static int kernel_send_rtmsg_v4(int action, mpls_label_t in_label,
d62a17ae	46	zebra_nhlfe_t *nhlfe)
d3e2c74a	47	{
d62a17ae	48	struct iovec iov[5];
	49	struct rt_msghdr hdr;
	50	struct sockaddr_mpls sa_label_in, sa_label_out;
	51	struct sockaddr_in nexthop;
	52	int iovcnt = 0;
	53	int ret;
	54
	55	if (IS_ZEBRA_DEBUG_KERNEL)
	56	zlog_debug("%s: 0x%x, label=%u", __func__, action, in_label);
	57
	58	/* initialize header */
	59	memset(&hdr, 0, sizeof(hdr));
	60	hdr.rtm_version = RTM_VERSION;
	61
	62	hdr.rtm_type = action;
	63	hdr.rtm_flags = RTF_UP;
	64	hdr.rtm_fmask = RTF_MPLS;
	65	hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */
	66	hdr.rtm_msglen = sizeof(hdr);
	67	hdr.rtm_hdrlen = sizeof(struct rt_msghdr);
	68	hdr.rtm_priority = 0;
	69	/* adjust iovec */
	70	iov[iovcnt].iov_base = &hdr;
	71	iov[iovcnt++].iov_len = sizeof(hdr);
	72
	73	/* in label */
	74	memset(&sa_label_in, 0, sizeof(sa_label_in));
	75	sa_label_in.smpls_len = sizeof(sa_label_in);
	76	sa_label_in.smpls_family = AF_MPLS;
	77	sa_label_in.smpls_label = htonl(in_label << MPLS_LABEL_OFFSET);
	78	/* adjust header */
	79	hdr.rtm_flags \|= RTF_MPLS \| RTF_MPATH;
	80	hdr.rtm_addrs \|= RTA_DST;
	81	hdr.rtm_msglen += sizeof(sa_label_in);
	82	/* adjust iovec */
	83	iov[iovcnt].iov_base = &sa_label_in;
	84	iov[iovcnt++].iov_len = sizeof(sa_label_in);
	85
	86	/* nexthop */
	87	memset(&nexthop, 0, sizeof(nexthop));
	88	nexthop.sin_len = sizeof(nexthop);
	89	nexthop.sin_family = AF_INET;
	90	nexthop.sin_addr = nhlfe->nexthop->gate.ipv4;
	91	/* adjust header */
	92	hdr.rtm_flags \|= RTF_GATEWAY;
	93	hdr.rtm_addrs \|= RTA_GATEWAY;
	94	hdr.rtm_msglen += sizeof(nexthop);
	95	/* adjust iovec */
	96	iov[iovcnt].iov_base = &nexthop;
	97	iov[iovcnt++].iov_len = sizeof(nexthop);
	98
	99	/* If action is RTM_DELETE we have to get rid of MPLS infos */
	100	if (action != RTM_DELETE) {
	101	memset(&sa_label_out, 0, sizeof(sa_label_out));
	102	sa_label_out.smpls_len = sizeof(sa_label_out);
	103	sa_label_out.smpls_family = AF_MPLS;
	104	sa_label_out.smpls_label =
	105	htonl(nhlfe->nexthop->nh_label->label[0]
	106	<< MPLS_LABEL_OFFSET);
	107	/* adjust header */
	108	hdr.rtm_addrs \|= RTA_SRC;
	109	hdr.rtm_flags \|= RTF_MPLS;
	110	hdr.rtm_msglen += sizeof(sa_label_out);
	111	/* adjust iovec */
112	iov[iovcnt].iov_base = &sa_label_out;
113	iov[iovcnt++].iov_len = sizeof(sa_label_out);
114
115	if (nhlfe->nexthop->nh_label->label[0] == MPLS_LABEL_IMPLNULL)
116	hdr.rtm_mpls = MPLS_OP_POP;
117	else
118	hdr.rtm_mpls = MPLS_OP_SWAP;
119	}
120
01b9e3fd DL	121	frr_elevate_privs(&zserv_privs) {
	122	ret = writev(kr_state.fd, iov, iovcnt);
	123	}
d62a17ae	124
d62a17ae	125	if (ret == -1)
450971aa	126	flog_err_sys(EC_LIB_SOCKET, "%s: %s", __func__,
09c866e3	127	safe_strerror(errno));
d62a17ae	128
d62a17ae	129	return ret;
e07486ce RW	130	}
	131
	132	#if !defined(ROUNDUP)
d62a17ae	133	#define ROUNDUP(a) \
d62a17ae	134	(((a) & (sizeof(long) - 1)) ? (1 + ((a) \| (sizeof(long) - 1))) : (a))
e07486ce RW	135	#endif
e07486ce RW	136
d62a17ae	137	static int kernel_send_rtmsg_v6(int action, mpls_label_t in_label,
d62a17ae	138	zebra_nhlfe_t *nhlfe)
e07486ce	139	{
d62a17ae	140	struct iovec iov[5];
	141	struct rt_msghdr hdr;
	142	struct sockaddr_mpls sa_label_in, sa_label_out;
	143	struct pad {
	144	struct sockaddr_in6 addr;
	145	char pad[sizeof(long)]; /* thank you IPv6 */
	146	} nexthop;
	147	int iovcnt = 0;
	148	int ret;
	149
	150	if (IS_ZEBRA_DEBUG_KERNEL)
	151	zlog_debug("%s: 0x%x, label=%u", __func__, action, in_label);
	152
	153	/* initialize header */
	154	memset(&hdr, 0, sizeof(hdr));
	155	hdr.rtm_version = RTM_VERSION;
	156
	157	hdr.rtm_type = action;
	158	hdr.rtm_flags = RTF_UP;
	159	hdr.rtm_fmask = RTF_MPLS;
	160	hdr.rtm_seq = kr_state.rtseq++; /* overflow doesn't matter */
	161	hdr.rtm_msglen = sizeof(hdr);
	162	hdr.rtm_hdrlen = sizeof(struct rt_msghdr);
	163	hdr.rtm_priority = 0;
	164	/* adjust iovec */
	165	iov[iovcnt].iov_base = &hdr;
	166	iov[iovcnt++].iov_len = sizeof(hdr);
	167
	168	/* in label */
	169	memset(&sa_label_in, 0, sizeof(sa_label_in));
	170	sa_label_in.smpls_len = sizeof(sa_label_in);
	171	sa_label_in.smpls_family = AF_MPLS;
	172	sa_label_in.smpls_label = htonl(in_label << MPLS_LABEL_OFFSET);
	173	/* adjust header */
	174	hdr.rtm_flags \|= RTF_MPLS \| RTF_MPATH;
	175	hdr.rtm_addrs \|= RTA_DST;
	176	hdr.rtm_msglen += sizeof(sa_label_in);
	177	/* adjust iovec */
	178	iov[iovcnt].iov_base = &sa_label_in;
	179	iov[iovcnt++].iov_len = sizeof(sa_label_in);
	180
	181	/* nexthop */
	182	memset(&nexthop, 0, sizeof(nexthop));
	183	nexthop.addr.sin6_len = sizeof(struct sockaddr_in6);
	184	nexthop.addr.sin6_family = AF_INET6;
	185	nexthop.addr.sin6_addr = nhlfe->nexthop->gate.ipv6;
	186	if (IN6_IS_ADDR_LINKLOCAL(&nexthop.addr.sin6_addr)) {
	187	uint16_t tmp16;
	188	struct sockaddr_in6 *sin6 = &nexthop.addr;
	189
	190	nexthop.addr.sin6_scope_id = nhlfe->nexthop->ifindex;
	191
	192	memcpy(&tmp16, &sin6->sin6_addr.s6_addr[2], sizeof(tmp16));
	193	tmp16 = htons(sin6->sin6_scope_id);
	194	memcpy(&sin6->sin6_addr.s6_addr[2], &tmp16, sizeof(tmp16));
	195	sin6->sin6_scope_id = 0;
	196	}
	197
	198	/* adjust header */
	199	hdr.rtm_flags \|= RTF_GATEWAY;
	200	hdr.rtm_addrs \|= RTA_GATEWAY;
	201	hdr.rtm_msglen += ROUNDUP(sizeof(struct sockaddr_in6));
	202	/* adjust iovec */
	203	iov[iovcnt].iov_base = &nexthop;
204	iov[iovcnt++].iov_len = ROUNDUP(sizeof(struct sockaddr_in6));
205
206	/* If action is RTM_DELETE we have to get rid of MPLS infos */
207	if (action != RTM_DELETE) {
208	memset(&sa_label_out, 0, sizeof(sa_label_out));
209	sa_label_out.smpls_len = sizeof(sa_label_out);
210	sa_label_out.smpls_family = AF_MPLS;
211	sa_label_out.smpls_label =
212	htonl(nhlfe->nexthop->nh_label->label[0]
213	<< MPLS_LABEL_OFFSET);
214	/* adjust header */
215	hdr.rtm_addrs \|= RTA_SRC;
216	hdr.rtm_flags \|= RTF_MPLS;
217	hdr.rtm_msglen += sizeof(sa_label_out);
218	/* adjust iovec */
219	iov[iovcnt].iov_base = &sa_label_out;
220	iov[iovcnt++].iov_len = sizeof(sa_label_out);
221
222	if (nhlfe->nexthop->nh_label->label[0] == MPLS_LABEL_IMPLNULL)
223	hdr.rtm_mpls = MPLS_OP_POP;
224	else
225	hdr.rtm_mpls = MPLS_OP_SWAP;
226	}
227
01b9e3fd DL	228	frr_elevate_privs(&zserv_privs) {
	229	ret = writev(kr_state.fd, iov, iovcnt);
	230	}
d62a17ae	231
d62a17ae	232	if (ret == -1)
450971aa	233	flog_err_sys(EC_LIB_SOCKET, "%s: %s", __func__,
09c866e3	234	safe_strerror(errno));
d62a17ae	235
d62a17ae	236	return ret;
d3e2c74a RW	237	}
d3e2c74a RW	238
d62a17ae	239	static int kernel_lsp_cmd(int action, zebra_lsp_t *lsp)
d3e2c74a	240	{
d62a17ae	241	zebra_nhlfe_t *nhlfe;
	242	struct nexthop *nexthop = NULL;
	243	unsigned int nexthop_num = 0;
	244
	245	for (nhlfe = lsp->nhlfe_list; nhlfe; nhlfe = nhlfe->next) {
	246	nexthop = nhlfe->nexthop;
	247	if (!nexthop)
	248	continue;
	249
	250	if (nexthop_num >= multipath_num)
	251	break;
	252
	253	if (((action == RTM_ADD \|\| action == RTM_CHANGE)
	254	&& (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED)
	255	&& CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE)))
	256	\|\| (action == RTM_DELETE
	257	&& (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED)
	258	&& CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB)))) {
5e8c8947	259	if (nhlfe->nexthop->nh_label->num_labels > 1) {
e914ccbe	260	flog_warn(EC_ZEBRA_MAX_LABELS_PUSH,
9df414fe QY	261	"%s: can't push %u labels at once "
	262	"(maximum is 1)",
	263	__func__,
	264	nhlfe->nexthop->nh_label->num_labels);
5e8c8947 RW	265	continue;
	266	}
	267
d62a17ae	268	nexthop_num++;
	269
	270	switch (NHLFE_FAMILY(nhlfe)) {
	271	case AF_INET:
	272	kernel_send_rtmsg_v4(action, lsp->ile.in_label,
	273	nhlfe);
	274	break;
	275	case AF_INET6:
	276	kernel_send_rtmsg_v6(action, lsp->ile.in_label,
	277	nhlfe);
	278	break;
	279	default:
	280	break;
	281	}
d62a17ae	282	}
	283	}
	284
	285	return (0);
d3e2c74a RW	286	}
d3e2c74a RW	287
ea1c14f6	288	enum zebra_dplane_result kernel_add_lsp(zebra_lsp_t *lsp)
d3e2c74a	289	{
d62a17ae	290	int ret;
c4c8dec0	291
4a83e7a0	292	if (!lsp \|\| !lsp->best_nhlfe) { // unexpected
ea1c14f6 MS	293	kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_INSTALL_FAILURE);
ea1c14f6 MS	294	return ZEBRA_DPLANE_REQUEST_FAILURE;
4a83e7a0	295	}
d3e2c74a	296
d62a17ae	297	ret = kernel_lsp_cmd(RTM_ADD, lsp);
c4c8dec0	298
4a83e7a0	299	kernel_lsp_pass_fail(lsp,
ea1c14f6 MS	300	(!ret) ? ZEBRA_DPLANE_INSTALL_SUCCESS
ea1c14f6 MS	301	: ZEBRA_DPLANE_INSTALL_FAILURE);
7c5d0e18	302
ea1c14f6	303	return ZEBRA_DPLANE_REQUEST_SUCCESS;
d3e2c74a RW	304	}
d3e2c74a RW	305
ea1c14f6	306	enum zebra_dplane_result kernel_upd_lsp(zebra_lsp_t *lsp)
d3e2c74a	307	{
d62a17ae	308	int ret;
c4c8dec0	309
4a83e7a0	310	if (!lsp \|\| !lsp->best_nhlfe) { // unexpected
ea1c14f6 MS	311	kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_INSTALL_FAILURE);
ea1c14f6 MS	312	return ZEBRA_DPLANE_REQUEST_FAILURE;
4a83e7a0	313	}
d3e2c74a	314
d62a17ae	315	ret = kernel_lsp_cmd(RTM_CHANGE, lsp);
c4c8dec0	316
4a83e7a0	317	kernel_lsp_pass_fail(lsp,
ea1c14f6 MS	318	(!ret) ? ZEBRA_DPLANE_INSTALL_SUCCESS
	319	: ZEBRA_DPLANE_INSTALL_FAILURE);
	320	return ZEBRA_DPLANE_REQUEST_SUCCESS;
d3e2c74a RW	321	}
d3e2c74a RW	322
ea1c14f6	323	enum zebra_dplane_result kernel_del_lsp(zebra_lsp_t *lsp)
d3e2c74a	324	{
d62a17ae	325	int ret;
c4c8dec0	326
4a83e7a0	327	if (!lsp) { // unexpected
ea1c14f6 MS	328	kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_DELETE_FAILURE);
ea1c14f6 MS	329	return ZEBRA_DPLANE_REQUEST_FAILURE;
4a83e7a0	330	}
d3e2c74a	331
4a83e7a0	332	if (!CHECK_FLAG(lsp->flags, LSP_FLAG_INSTALLED)) {
ea1c14f6 MS	333	kernel_lsp_pass_fail(lsp, ZEBRA_DPLANE_DELETE_FAILURE);
ea1c14f6 MS	334	return ZEBRA_DPLANE_REQUEST_FAILURE;
4a83e7a0	335	}
c4c8dec0	336
d62a17ae	337	ret = kernel_lsp_cmd(RTM_DELETE, lsp);
c4c8dec0	338
4a83e7a0	339	kernel_lsp_pass_fail(lsp,
ea1c14f6 MS	340	(!ret) ? ZEBRA_DPLANE_DELETE_SUCCESS
ea1c14f6 MS	341	: ZEBRA_DPLANE_DELETE_FAILURE);
7c5d0e18	342
ea1c14f6	343	return ZEBRA_DPLANE_REQUEST_SUCCESS;
d3e2c74a RW	344	}
d3e2c74a RW	345
d42127da RW	346	static int kmpw_install(struct zebra_pw *pw)
	347	{
	348	struct ifreq ifr;
	349	struct ifmpwreq imr;
	350	struct sockaddr_storage ss;
	351	struct sockaddr_in sa_in = (struct sockaddr_in )&ss;
	352	struct sockaddr_in6 sa_in6 = (struct sockaddr_in6 )&ss;
	353
	354	memset(&imr, 0, sizeof(imr));
	355	switch (pw->type) {
	356	case PW_TYPE_ETHERNET:
	357	imr.imr_type = IMR_TYPE_ETHERNET;
	358	break;
	359	case PW_TYPE_ETHERNET_TAGGED:
	360	imr.imr_type = IMR_TYPE_ETHERNET_TAGGED;
	361	break;
	362	default:
9df414fe QY	363	zlog_debug("%s: unhandled pseudowire type (%#X)", __func__,
9df414fe QY	364	pw->type);
d42127da RW	365	return -1;
	366	}
	367
	368	if (pw->flags & F_PSEUDOWIRE_CWORD)
	369	imr.imr_flags \|= IMR_FLAG_CONTROLWORD;
	370
	371	/* pseudowire nexthop */
	372	memset(&ss, 0, sizeof(ss));
	373	switch (pw->af) {
	374	case AF_INET:
	375	sa_in->sin_family = AF_INET;
	376	sa_in->sin_len = sizeof(struct sockaddr_in);
	377	sa_in->sin_addr = pw->nexthop.ipv4;
	378	break;
	379	case AF_INET6:
	380	sa_in6->sin6_family = AF_INET6;
	381	sa_in6->sin6_len = sizeof(struct sockaddr_in6);
	382	sa_in6->sin6_addr = pw->nexthop.ipv6;
	383	break;
	384	default:
9df414fe QY	385	zlog_debug("%s: unhandled pseudowire address-family (%u)",
9df414fe QY	386	__func__, pw->af);
d42127da RW	387	return -1;
	388	}
	389	memcpy(&imr.imr_nexthop, (struct sockaddr *)&ss,
	390	sizeof(imr.imr_nexthop));
	391
	392	/* pseudowire local/remote labels */
	393	imr.imr_lshim.shim_label = pw->local_label;
	394	imr.imr_rshim.shim_label = pw->remote_label;
	395
	396	/* ioctl */
	397	memset(&ifr, 0, sizeof(ifr));
	398	strlcpy(ifr.ifr_name, pw->ifname, sizeof(ifr.ifr_name));
	399	ifr.ifr_data = (caddr_t)&imr;
	400	if (ioctl(kr_state.ioctl_fd, SIOCSETMPWCFG, &ifr) == -1) {
450971aa	401	flog_err_sys(EC_LIB_SYSTEM_CALL, "ioctl SIOCSETMPWCFG: %s",
09c866e3	402	safe_strerror(errno));
d42127da RW	403	return -1;
	404	}
	405
	406	return 0;
	407	}
	408
	409	static int kmpw_uninstall(struct zebra_pw *pw)
	410	{
	411	struct ifreq ifr;
	412	struct ifmpwreq imr;
	413
	414	memset(&ifr, 0, sizeof(ifr));
	415	memset(&imr, 0, sizeof(imr));
	416	strlcpy(ifr.ifr_name, pw->ifname, sizeof(ifr.ifr_name));
	417	ifr.ifr_data = (caddr_t)&imr;
	418	if (ioctl(kr_state.ioctl_fd, SIOCSETMPWCFG, &ifr) == -1) {
450971aa	419	flog_err_sys(EC_LIB_SYSTEM_CALL, "ioctl SIOCSETMPWCFG: %s",
09c866e3	420	safe_strerror(errno));
d42127da RW	421	return -1;
	422	}
	423
	424	return 0;
	425	}
	426
d3e2c74a	427	#define MAX_RTSOCK_BUF 128 * 1024
d62a17ae	428	int mpls_kernel_init(void)
d3e2c74a	429	{
d62a17ae	430	int rcvbuf, default_rcvbuf;
	431	socklen_t optlen;
	432
	433	if ((kr_state.fd = socket(AF_ROUTE, SOCK_RAW, 0)) == -1) {
450971aa	434	flog_err_sys(EC_LIB_SOCKET, "%s: socket", __func__);
d62a17ae	435	return -1;
	436	}
	437
d42127da RW	438	if ((kr_state.ioctl_fd = socket(AF_INET, SOCK_DGRAM \| SOCK_NONBLOCK, 0))
d42127da RW	439	== -1) {
450971aa	440	flog_err_sys(EC_LIB_SOCKET, "%s: ioctl socket", __func__);
d42127da RW	441	return -1;
	442	}
	443
d62a17ae	444	/* grow receive buffer, don't wanna miss messages */
	445	optlen = sizeof(default_rcvbuf);
	446	if (getsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, &default_rcvbuf,
	447	&optlen)
	448	== -1)
450971aa	449	flog_err_sys(EC_LIB_SOCKET,
9df414fe	450	"kr_init getsockopt SOL_SOCKET SO_RCVBUF");
d62a17ae	451	else
	452	for (rcvbuf = MAX_RTSOCK_BUF;
	453	rcvbuf > default_rcvbuf
	454	&& setsockopt(kr_state.fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf,
	455	sizeof(rcvbuf))
	456	== -1
	457	&& errno == ENOBUFS;
	458	rcvbuf /= 2)
	459	; /* nothing */
	460
	461	kr_state.rtseq = 1;
	462
d42127da RW	463	/* register hook to install/uninstall pseudowires */
	464	hook_register(pw_install, kmpw_install);
	465	hook_register(pw_uninstall, kmpw_uninstall);
	466
d62a17ae	467	return 0;
d3e2c74a	468	}
ddfeb486 DL	469
ddfeb486 DL	470	#endif /* OPEN_BSD */