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/*
* 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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include <netmpls/mpls.h>
#include "zebra/rt.h"
#include "zebra/zebra_mpls.h"
#include "zebra/debug.h"
#include "privs.h"
#include "prefix.h"
#include "interface.h"
#include "log.h"
extern struct zebra_privs_t zserv_privs;
struct {
u_int32_t rtseq;
int fd;
} kr_state;
static int
kernel_send_rtmsg (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 ("kernel_send_rtmsg: 0x%x, label=%u", action, in_label);
/* initialize header */
bzero(&hdr, 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 */
bzero(&sa_label_in, 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 */
bzero(&nexthop, 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)
{
bzero(&sa_label_out, 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;
}
if (zserv_privs.change(ZPRIVS_RAISE))
zlog_err ("Can't raise privileges");
ret = writev (kr_state.fd, iov, iovcnt);
if (zserv_privs.change(ZPRIVS_LOWER))
zlog_err ("Can't lower privileges");
if (ret == -1)
zlog_err ("kernel_send_rtmsg: %s", safe_strerror (errno));
return ret;
}
static int
kernel_lsp_cmd (int action, zebra_lsp_t *lsp)
{
zebra_nhlfe_t *nhlfe;
struct nexthop *nexthop = NULL;
int nexthop_num = 0;
for (nhlfe = lsp->nhlfe_list; nhlfe; nhlfe = nhlfe->next)
{
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
if (MULTIPATH_NUM != 0 && nexthop_num >= MULTIPATH_NUM)
break;
/* XXX */
if (NHLFE_FAMILY(nhlfe) == AF_INET6)
continue;
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))))
{
nexthop_num++;
kernel_send_rtmsg (action, lsp->ile.in_label, nhlfe);
if (action == RTM_ADD || action == RTM_CHANGE)
{
SET_FLAG (nhlfe->flags, NHLFE_FLAG_INSTALLED);
SET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
}
else
{
UNSET_FLAG (nhlfe->flags, NHLFE_FLAG_INSTALLED);
UNSET_FLAG (nexthop->flags, NEXTHOP_FLAG_FIB);
}
}
}
return (0);
}
int
kernel_add_lsp (zebra_lsp_t *lsp)
{
if (!lsp || !lsp->best_nhlfe) // unexpected
return -1;
return kernel_lsp_cmd (RTM_ADD, lsp);
}
int
kernel_upd_lsp (zebra_lsp_t *lsp)
{
if (!lsp || !lsp->best_nhlfe) // unexpected
return -1;
return kernel_lsp_cmd (RTM_CHANGE, lsp);
}
int
kernel_del_lsp (zebra_lsp_t *lsp)
{
if (!lsp) // unexpected
return -1;
return kernel_lsp_cmd (RTM_DELETE, lsp);
}
#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) {
zlog_warn("%s: 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)
zlog_warn("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;
return 0;
}
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