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/* A generic nexthop structure
* Copyright (C) 2013 Cumulus Networks, Inc.
*
* This file is part of Quagga.
*
* Quagga 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.
*
* Quagga 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 Quagga; 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 "prefix.h"
#include "table.h"
#include "memory.h"
#include "command.h"
#include "if.h"
#include "log.h"
#include "sockunion.h"
#include "linklist.h"
#include "thread.h"
#include "prefix.h"
#include "nexthop.h"
#include "mpls.h"
DEFINE_MTYPE_STATIC(LIB, NEXTHOP, "Nexthop")
DEFINE_MTYPE_STATIC(LIB, NH_LABEL, "Nexthop label")
/* check if nexthops are same, non-recursive */
int
nexthop_same_no_recurse (struct nexthop *next1, struct nexthop *next2)
{
if (next1->type != next2->type)
return 0;
switch (next1->type)
{
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
if (! IPV4_ADDR_SAME (&next1->gate.ipv4, &next2->gate.ipv4))
return 0;
if (next1->ifindex && (next1->ifindex != next2->ifindex))
return 0;
break;
case NEXTHOP_TYPE_IFINDEX:
if (next1->ifindex != next2->ifindex)
return 0;
break;
case NEXTHOP_TYPE_IPV6:
if (! IPV6_ADDR_SAME (&next1->gate.ipv6, &next2->gate.ipv6))
return 0;
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
if (! IPV6_ADDR_SAME (&next1->gate.ipv6, &next2->gate.ipv6))
return 0;
if (next1->ifindex != next2->ifindex)
return 0;
break;
default:
/* do nothing */
break;
}
return 1;
}
/*
* nexthop_type_to_str
*/
const char *
nexthop_type_to_str (enum nexthop_types_t nh_type)
{
static const char *desc[] = {
"none",
"Directly connected",
"IPv4 nexthop",
"IPv4 nexthop with ifindex",
"IPv6 nexthop",
"IPv6 nexthop with ifindex",
"Null0 nexthop",
};
return desc[nh_type];
}
/*
* Check if the labels match for the 2 nexthops specified.
*/
int
nexthop_labels_match (struct nexthop *nh1, struct nexthop *nh2)
{
struct nexthop_label *nhl1, *nhl2;
nhl1 = nh1->nh_label;
nhl2 = nh2->nh_label;
if ((nhl1 && !nhl2) || (!nhl1 && nhl2))
return 0;
if (nhl1->num_labels != nhl2->num_labels)
return 0;
if (memcmp (nhl1->label, nhl2->label, nhl1->num_labels))
return 0;
return 1;
}
struct nexthop *
nexthop_new (void)
{
return XCALLOC (MTYPE_NEXTHOP, sizeof (struct nexthop));
}
/* Add nexthop to the end of a nexthop list. */
void
nexthop_add (struct nexthop **target, struct nexthop *nexthop)
{
struct nexthop *last;
for (last = *target; last && last->next; last = last->next)
;
if (last)
last->next = nexthop;
else
*target = nexthop;
nexthop->prev = last;
}
void
copy_nexthops (struct nexthop **tnh, struct nexthop *nh)
{
struct nexthop *nexthop;
struct nexthop *nh1;
for (nh1 = nh; nh1; nh1 = nh1->next)
{
nexthop = nexthop_new();
nexthop->flags = nh->flags;
nexthop->type = nh->type;
nexthop->ifindex = nh->ifindex;
memcpy(&(nexthop->gate), &(nh->gate), sizeof(union g_addr));
memcpy(&(nexthop->src), &(nh->src), sizeof(union g_addr));
if (nh->nh_label)
nexthop_add_labels (nexthop, nh->nh_label_type,
nh->nh_label->num_labels, &nh->nh_label->label[0]);
nexthop_add(tnh, nexthop);
if (CHECK_FLAG(nh1->flags, NEXTHOP_FLAG_RECURSIVE))
copy_nexthops(&nexthop->resolved, nh1->resolved);
}
}
/* Free nexthop. */
void
nexthop_free (struct nexthop *nexthop)
{
nexthop_del_labels (nexthop);
if (nexthop->resolved)
nexthops_free(nexthop->resolved);
XFREE (MTYPE_NEXTHOP, nexthop);
}
/* Frees a list of nexthops */
void
nexthops_free (struct nexthop *nexthop)
{
struct nexthop *nh, *next;
for (nh = nexthop; nh; nh = next)
{
next = nh->next;
nexthop_free (nh);
}
}
/* Update nexthop with label information. */
void
nexthop_add_labels (struct nexthop *nexthop, enum lsp_types_t type,
u_int8_t num_labels, mpls_label_t *label)
{
struct nexthop_label *nh_label;
int i;
nexthop->nh_label_type = type;
nh_label = XCALLOC (MTYPE_NH_LABEL, sizeof (struct nexthop_label) +
num_labels * sizeof (mpls_label_t));
nh_label->num_labels = num_labels;
for (i = 0; i < num_labels; i++)
nh_label->label[i] = *(label + i);
nexthop->nh_label = nh_label;
}
/* Free label information of nexthop, if present. */
void
nexthop_del_labels (struct nexthop *nexthop)
{
if (nexthop->nh_label)
{
XFREE (MTYPE_NH_LABEL, nexthop->nh_label);
nexthop->nh_label_type = ZEBRA_LSP_NONE;
}
}
const char *
nexthop2str (struct nexthop *nexthop, char *str, int size)
{
switch (nexthop->type)
{
case NEXTHOP_TYPE_IFINDEX:
snprintf (str, size, "if %u", nexthop->ifindex);
break;
case NEXTHOP_TYPE_IPV4:
snprintf (str, size, "%s", inet_ntoa (nexthop->gate.ipv4));
break;
case NEXTHOP_TYPE_IPV4_IFINDEX:
snprintf (str, size, "%s if %u",
inet_ntoa (nexthop->gate.ipv4), nexthop->ifindex);
break;
case NEXTHOP_TYPE_IPV6:
snprintf (str, size, "%s", inet6_ntoa (nexthop->gate.ipv6));
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
snprintf (str, size, "%s if %u",
inet6_ntoa (nexthop->gate.ipv6), nexthop->ifindex);
break;
case NEXTHOP_TYPE_BLACKHOLE:
snprintf (str, size, "blackhole");
break;
default:
snprintf (str, size, "unknown");
break;
}
return str;
}
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