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zserv.c
3300 lines (2816 loc) · 84.4 KB
/
zserv.c
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/* Zebra daemon server routine.
* Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
*
* 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>
#include <sys/un.h>
/* for basename */
#include <libgen.h>
#include "prefix.h"
#include "command.h"
#include "if.h"
#include "thread.h"
#include "stream.h"
#include "memory.h"
#include "zebra_memory.h"
#include "table.h"
#include "rib.h"
#include "network.h"
#include "sockunion.h"
#include "log.h"
#include "zclient.h"
#include "privs.h"
#include "network.h"
#include "buffer.h"
#include "nexthop.h"
#include "vrf.h"
#include "libfrr.h"
#include "sockopt.h"
#include "zebra/zserv.h"
#include "zebra/zebra_ns.h"
#include "zebra/zebra_vrf.h"
#include "zebra/router-id.h"
#include "zebra/redistribute.h"
#include "zebra/debug.h"
#include "zebra/zebra_rnh.h"
#include "zebra/rt_netlink.h"
#include "zebra/interface.h"
#include "zebra/zebra_ptm.h"
#include "zebra/rtadv.h"
#include "zebra/zebra_mpls.h"
#include "zebra/zebra_mroute.h"
#include "zebra/label_manager.h"
#include "zebra/zebra_vxlan.h"
#include "zebra/rt.h"
#include "zebra/zebra_pbr.h"
/* Event list of zebra. */
enum event { ZEBRA_READ, ZEBRA_WRITE };
/* privileges */
extern struct zebra_privs_t zserv_privs;
/* post event into client */
static void zebra_event(struct zserv *client, enum event event);
/* Public interface ======================================================== */
int zebra_server_send_message(struct zserv *client, struct stream *msg)
{
stream_fifo_push(client->obuf_fifo, msg);
zebra_event(client, ZEBRA_WRITE);
return 0;
}
/* Encoding helpers -------------------------------------------------------- */
static void zserv_encode_interface(struct stream *s, struct interface *ifp)
{
/* Interface information. */
stream_put(s, ifp->name, INTERFACE_NAMSIZ);
stream_putl(s, ifp->ifindex);
stream_putc(s, ifp->status);
stream_putq(s, ifp->flags);
stream_putc(s, ifp->ptm_enable);
stream_putc(s, ifp->ptm_status);
stream_putl(s, ifp->metric);
stream_putl(s, ifp->speed);
stream_putl(s, ifp->mtu);
stream_putl(s, ifp->mtu6);
stream_putl(s, ifp->bandwidth);
stream_putl(s, ifp->ll_type);
stream_putl(s, ifp->hw_addr_len);
if (ifp->hw_addr_len)
stream_put(s, ifp->hw_addr, ifp->hw_addr_len);
/* Then, Traffic Engineering parameters if any */
if (HAS_LINK_PARAMS(ifp) && IS_LINK_PARAMS_SET(ifp->link_params)) {
stream_putc(s, 1);
zebra_interface_link_params_write(s, ifp);
} else
stream_putc(s, 0);
/* Write packet size. */
stream_putw_at(s, 0, stream_get_endp(s));
}
static void zserv_encode_vrf(struct stream *s, struct zebra_vrf *zvrf)
{
struct vrf_data data;
const char *netns_name = zvrf_ns_name(zvrf);
data.l.table_id = zvrf->table_id;
if (netns_name)
strlcpy(data.l.netns_name, basename((char *)netns_name),
NS_NAMSIZ);
else
memset(data.l.netns_name, 0, NS_NAMSIZ);
/* Pass the tableid and the netns NAME */
stream_put(s, &data, sizeof(struct vrf_data));
/* Interface information. */
stream_put(s, zvrf_name(zvrf), VRF_NAMSIZ);
/* Write packet size. */
stream_putw_at(s, 0, stream_get_endp(s));
}
static int zserv_encode_nexthop(struct stream *s, struct nexthop *nexthop)
{
stream_putc(s, nexthop->type);
switch (nexthop->type) {
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
stream_put_in_addr(s, &nexthop->gate.ipv4);
stream_putl(s, nexthop->ifindex);
break;
case NEXTHOP_TYPE_IPV6:
stream_put(s, &nexthop->gate.ipv6, 16);
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
stream_put(s, &nexthop->gate.ipv6, 16);
stream_putl(s, nexthop->ifindex);
break;
case NEXTHOP_TYPE_IFINDEX:
stream_putl(s, nexthop->ifindex);
break;
default:
/* do nothing */
break;
}
return 1;
}
/* Send handlers ----------------------------------------------------------- */
/* Interface is added. Send ZEBRA_INTERFACE_ADD to client. */
/*
* This function is called in the following situations:
* - in response to a 3-byte ZEBRA_INTERFACE_ADD request
* from the client.
* - at startup, when zebra figures out the available interfaces
* - when an interface is added (where support for
* RTM_IFANNOUNCE or AF_NETLINK sockets is available), or when
* an interface is marked IFF_UP (i.e., an RTM_IFINFO message is
* received)
*/
int zsend_interface_add(struct zserv *client, struct interface *ifp)
{
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_INTERFACE_ADD, ifp->vrf_id);
zserv_encode_interface(s, ifp);
client->ifadd_cnt++;
return zebra_server_send_message(client, s);
}
/* Interface deletion from zebra daemon. */
int zsend_interface_delete(struct zserv *client, struct interface *ifp)
{
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_INTERFACE_DELETE, ifp->vrf_id);
zserv_encode_interface(s, ifp);
client->ifdel_cnt++;
return zebra_server_send_message(client, s);
}
int zsend_vrf_add(struct zserv *client, struct zebra_vrf *zvrf)
{
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_VRF_ADD, zvrf_id(zvrf));
zserv_encode_vrf(s, zvrf);
client->vrfadd_cnt++;
return zebra_server_send_message(client, s);
}
/* VRF deletion from zebra daemon. */
int zsend_vrf_delete(struct zserv *client, struct zebra_vrf *zvrf)
{
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_VRF_DELETE, zvrf_id(zvrf));
zserv_encode_vrf(s, zvrf);
client->vrfdel_cnt++;
return zebra_server_send_message(client, s);
}
int zsend_interface_link_params(struct zserv *client, struct interface *ifp)
{
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
/* Check this client need interface information. */
if (!client->ifinfo)
return 0;
if (!ifp->link_params)
return 0;
zclient_create_header(s, ZEBRA_INTERFACE_LINK_PARAMS, ifp->vrf_id);
/* Add Interface Index */
stream_putl(s, ifp->ifindex);
/* Then TE Link Parameters */
if (zebra_interface_link_params_write(s, ifp) == 0)
return 0;
/* Write packet size. */
stream_putw_at(s, 0, stream_get_endp(s));
return zebra_server_send_message(client, s);
}
/* Interface address is added/deleted. Send ZEBRA_INTERFACE_ADDRESS_ADD or
* ZEBRA_INTERFACE_ADDRESS_DELETE to the client.
*
* A ZEBRA_INTERFACE_ADDRESS_ADD is sent in the following situations:
* - in response to a 3-byte ZEBRA_INTERFACE_ADD request
* from the client, after the ZEBRA_INTERFACE_ADD has been
* sent from zebra to the client
* - redistribute new address info to all clients in the following situations
* - at startup, when zebra figures out the available interfaces
* - when an interface is added (where support for
* RTM_IFANNOUNCE or AF_NETLINK sockets is available), or when
* an interface is marked IFF_UP (i.e., an RTM_IFINFO message is
* received)
* - for the vty commands "ip address A.B.C.D/M [<secondary>|<label LINE>]"
* and "no bandwidth <1-10000000>", "ipv6 address X:X::X:X/M"
* - when an RTM_NEWADDR message is received from the kernel,
*
* The call tree that triggers ZEBRA_INTERFACE_ADDRESS_DELETE:
*
* zsend_interface_address(DELETE)
* ^
* |
* zebra_interface_address_delete_update
* ^ ^ ^
* | | if_delete_update
* | |
* ip_address_uninstall connected_delete_ipv4
* [ipv6_addresss_uninstall] [connected_delete_ipv6]
* ^ ^
* | |
* | RTM_NEWADDR on routing/netlink socket
* |
* vty commands:
* "no ip address A.B.C.D/M [label LINE]"
* "no ip address A.B.C.D/M secondary"
* ["no ipv6 address X:X::X:X/M"]
*
*/
int zsend_interface_address(int cmd, struct zserv *client,
struct interface *ifp, struct connected *ifc)
{
int blen;
struct prefix *p;
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, cmd, ifp->vrf_id);
stream_putl(s, ifp->ifindex);
/* Interface address flag. */
stream_putc(s, ifc->flags);
/* Prefix information. */
p = ifc->address;
stream_putc(s, p->family);
blen = prefix_blen(p);
stream_put(s, &p->u.prefix, blen);
/*
* XXX gnu version does not send prefixlen for
* ZEBRA_INTERFACE_ADDRESS_DELETE
* but zebra_interface_address_delete_read() in the gnu version
* expects to find it
*/
stream_putc(s, p->prefixlen);
/* Destination. */
p = ifc->destination;
if (p)
stream_put(s, &p->u.prefix, blen);
else
stream_put(s, NULL, blen);
/* Write packet size. */
stream_putw_at(s, 0, stream_get_endp(s));
client->connected_rt_add_cnt++;
return zebra_server_send_message(client, s);
}
static int zsend_interface_nbr_address(int cmd, struct zserv *client,
struct interface *ifp,
struct nbr_connected *ifc)
{
int blen;
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
struct prefix *p;
zclient_create_header(s, cmd, ifp->vrf_id);
stream_putl(s, ifp->ifindex);
/* Prefix information. */
p = ifc->address;
stream_putc(s, p->family);
blen = prefix_blen(p);
stream_put(s, &p->u.prefix, blen);
/*
* XXX gnu version does not send prefixlen for
* ZEBRA_INTERFACE_ADDRESS_DELETE
* but zebra_interface_address_delete_read() in the gnu version
* expects to find it
*/
stream_putc(s, p->prefixlen);
/* Write packet size. */
stream_putw_at(s, 0, stream_get_endp(s));
return zebra_server_send_message(client, s);
}
/* Interface address addition. */
static void zebra_interface_nbr_address_add_update(struct interface *ifp,
struct nbr_connected *ifc)
{
struct listnode *node, *nnode;
struct zserv *client;
struct prefix *p;
if (IS_ZEBRA_DEBUG_EVENT) {
char buf[INET6_ADDRSTRLEN];
p = ifc->address;
zlog_debug(
"MESSAGE: ZEBRA_INTERFACE_NBR_ADDRESS_ADD %s/%d on %s",
inet_ntop(p->family, &p->u.prefix, buf,
INET6_ADDRSTRLEN),
p->prefixlen, ifc->ifp->name);
}
for (ALL_LIST_ELEMENTS(zebrad.client_list, node, nnode, client))
zsend_interface_nbr_address(ZEBRA_INTERFACE_NBR_ADDRESS_ADD,
client, ifp, ifc);
}
/* Interface address deletion. */
static void zebra_interface_nbr_address_delete_update(struct interface *ifp,
struct nbr_connected *ifc)
{
struct listnode *node, *nnode;
struct zserv *client;
struct prefix *p;
if (IS_ZEBRA_DEBUG_EVENT) {
char buf[INET6_ADDRSTRLEN];
p = ifc->address;
zlog_debug(
"MESSAGE: ZEBRA_INTERFACE_NBR_ADDRESS_DELETE %s/%d on %s",
inet_ntop(p->family, &p->u.prefix, buf,
INET6_ADDRSTRLEN),
p->prefixlen, ifc->ifp->name);
}
for (ALL_LIST_ELEMENTS(zebrad.client_list, node, nnode, client))
zsend_interface_nbr_address(ZEBRA_INTERFACE_NBR_ADDRESS_DELETE,
client, ifp, ifc);
}
/* Send addresses on interface to client */
int zsend_interface_addresses(struct zserv *client, struct interface *ifp)
{
struct listnode *cnode, *cnnode;
struct connected *c;
struct nbr_connected *nc;
/* Send interface addresses. */
for (ALL_LIST_ELEMENTS(ifp->connected, cnode, cnnode, c)) {
if (!CHECK_FLAG(c->conf, ZEBRA_IFC_REAL))
continue;
if (zsend_interface_address(ZEBRA_INTERFACE_ADDRESS_ADD, client,
ifp, c)
< 0)
return -1;
}
/* Send interface neighbors. */
for (ALL_LIST_ELEMENTS(ifp->nbr_connected, cnode, cnnode, nc)) {
if (zsend_interface_nbr_address(ZEBRA_INTERFACE_NBR_ADDRESS_ADD,
client, ifp, nc)
< 0)
return -1;
}
return 0;
}
/* Notify client about interface moving from one VRF to another.
* Whether client is interested in old and new VRF is checked by caller.
*/
int zsend_interface_vrf_update(struct zserv *client, struct interface *ifp,
vrf_id_t vrf_id)
{
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_INTERFACE_VRF_UPDATE, ifp->vrf_id);
/* Fill in the ifIndex of the interface and its new VRF (id) */
stream_putl(s, ifp->ifindex);
stream_putl(s, vrf_id);
/* Write packet size. */
stream_putw_at(s, 0, stream_get_endp(s));
client->if_vrfchg_cnt++;
return zebra_server_send_message(client, s);
}
/* Add new nbr connected IPv6 address */
void nbr_connected_add_ipv6(struct interface *ifp, struct in6_addr *address)
{
struct nbr_connected *ifc;
struct prefix p;
p.family = AF_INET6;
IPV6_ADDR_COPY(&p.u.prefix, address);
p.prefixlen = IPV6_MAX_PREFIXLEN;
if (!(ifc = listnode_head(ifp->nbr_connected))) {
/* new addition */
ifc = nbr_connected_new();
ifc->address = prefix_new();
ifc->ifp = ifp;
listnode_add(ifp->nbr_connected, ifc);
}
prefix_copy(ifc->address, &p);
zebra_interface_nbr_address_add_update(ifp, ifc);
if_nbr_ipv6ll_to_ipv4ll_neigh_update(ifp, address, 1);
}
void nbr_connected_delete_ipv6(struct interface *ifp, struct in6_addr *address)
{
struct nbr_connected *ifc;
struct prefix p;
p.family = AF_INET6;
IPV6_ADDR_COPY(&p.u.prefix, address);
p.prefixlen = IPV6_MAX_PREFIXLEN;
ifc = nbr_connected_check(ifp, &p);
if (!ifc)
return;
listnode_delete(ifp->nbr_connected, ifc);
zebra_interface_nbr_address_delete_update(ifp, ifc);
if_nbr_ipv6ll_to_ipv4ll_neigh_update(ifp, address, 0);
nbr_connected_free(ifc);
}
/*
* The cmd passed to zsend_interface_update may be ZEBRA_INTERFACE_UP or
* ZEBRA_INTERFACE_DOWN.
*
* The ZEBRA_INTERFACE_UP message is sent from the zebra server to
* the clients in one of 2 situations:
* - an if_up is detected e.g., as a result of an RTM_IFINFO message
* - a vty command modifying the bandwidth of an interface is received.
* The ZEBRA_INTERFACE_DOWN message is sent when an if_down is detected.
*/
int zsend_interface_update(int cmd, struct zserv *client, struct interface *ifp)
{
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, cmd, ifp->vrf_id);
zserv_encode_interface(s, ifp);
if (cmd == ZEBRA_INTERFACE_UP)
client->ifup_cnt++;
else
client->ifdown_cnt++;
return zebra_server_send_message(client, s);
}
int zsend_redistribute_route(int cmd, struct zserv *client, struct prefix *p,
struct prefix *src_p, struct route_entry *re)
{
struct zapi_route api;
struct zapi_nexthop *api_nh;
struct nexthop *nexthop;
int count = 0;
memset(&api, 0, sizeof(api));
api.vrf_id = re->vrf_id;
api.type = re->type;
api.instance = re->instance;
api.flags = re->flags;
/* Prefix. */
api.prefix = *p;
if (src_p) {
SET_FLAG(api.message, ZAPI_MESSAGE_SRCPFX);
memcpy(&api.src_prefix, src_p, sizeof(api.src_prefix));
}
/* Nexthops. */
if (re->nexthop_active_num) {
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
api.nexthop_num = re->nexthop_active_num;
}
for (nexthop = re->ng.nexthop; nexthop; nexthop = nexthop->next) {
if (!CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE))
continue;
api_nh = &api.nexthops[count];
api_nh->vrf_id = nexthop->vrf_id;
api_nh->type = nexthop->type;
switch (nexthop->type) {
case NEXTHOP_TYPE_BLACKHOLE:
api_nh->bh_type = nexthop->bh_type;
break;
case NEXTHOP_TYPE_IPV4:
api_nh->gate.ipv4 = nexthop->gate.ipv4;
break;
case NEXTHOP_TYPE_IPV4_IFINDEX:
api_nh->gate.ipv4 = nexthop->gate.ipv4;
api_nh->ifindex = nexthop->ifindex;
break;
case NEXTHOP_TYPE_IFINDEX:
api_nh->ifindex = nexthop->ifindex;
break;
case NEXTHOP_TYPE_IPV6:
api_nh->gate.ipv6 = nexthop->gate.ipv6;
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
api_nh->gate.ipv6 = nexthop->gate.ipv6;
api_nh->ifindex = nexthop->ifindex;
}
count++;
}
/* Attributes. */
SET_FLAG(api.message, ZAPI_MESSAGE_DISTANCE);
api.distance = re->distance;
SET_FLAG(api.message, ZAPI_MESSAGE_METRIC);
api.metric = re->metric;
if (re->tag) {
SET_FLAG(api.message, ZAPI_MESSAGE_TAG);
api.tag = re->tag;
}
SET_FLAG(api.message, ZAPI_MESSAGE_MTU);
api.mtu = re->mtu;
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
/* Encode route and send. */
if (zapi_route_encode(cmd, s, &api) < 0)
return -1;
return zebra_server_send_message(client, s);
}
/*
* Modified version of zsend_ipv4_nexthop_lookup(): Query unicast rib if
* nexthop is not found on mrib. Returns both route metric and protocol
* distance.
*/
static int zsend_ipv4_nexthop_lookup_mrib(struct zserv *client,
struct in_addr addr,
struct route_entry *re,
struct zebra_vrf *zvrf)
{
struct stream *s;
unsigned long nump;
u_char num;
struct nexthop *nexthop;
/* Get output stream. */
s = stream_new(ZEBRA_MAX_PACKET_SIZ);
stream_reset(s);
/* Fill in result. */
zclient_create_header(s, ZEBRA_IPV4_NEXTHOP_LOOKUP_MRIB, zvrf_id(zvrf));
stream_put_in_addr(s, &addr);
if (re) {
stream_putc(s, re->distance);
stream_putl(s, re->metric);
num = 0;
nump = stream_get_endp(
s); /* remember position for nexthop_num */
stream_putc(s, 0); /* reserve room for nexthop_num */
/* Only non-recursive routes are elegible to resolve the nexthop
* we
* are looking up. Therefore, we will just iterate over the top
* chain of nexthops. */
for (nexthop = re->ng.nexthop; nexthop; nexthop = nexthop->next)
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE))
num += zsend_write_nexthop(s, nexthop);
stream_putc_at(s, nump, num); /* store nexthop_num */
} else {
stream_putc(s, 0); /* distance */
stream_putl(s, 0); /* metric */
stream_putc(s, 0); /* nexthop_num */
}
stream_putw_at(s, 0, stream_get_endp(s));
return zebra_server_send_message(client, s);
}
int zsend_route_notify_owner(struct route_entry *re, struct prefix *p,
enum zapi_route_notify_owner note)
{
struct zserv *client;
struct stream *s;
uint8_t blen;
client = zebra_find_client(re->type, re->instance);
if (!client || !client->notify_owner) {
if (IS_ZEBRA_DEBUG_PACKET) {
char buff[PREFIX_STRLEN];
zlog_debug(
"Not Notifying Owner: %u about prefix %s(%u) %d",
re->type, prefix2str(p, buff, sizeof(buff)),
re->table, note);
}
return 0;
}
if (IS_ZEBRA_DEBUG_PACKET) {
char buff[PREFIX_STRLEN];
zlog_debug("Notifying Owner: %u about prefix %s(%u) %d",
re->type, prefix2str(p, buff, sizeof(buff)),
re->table, note);
}
s = stream_new(ZEBRA_MAX_PACKET_SIZ);
stream_reset(s);
zclient_create_header(s, ZEBRA_ROUTE_NOTIFY_OWNER, re->vrf_id);
stream_put(s, ¬e, sizeof(note));
stream_putc(s, p->family);
blen = prefix_blen(p);
stream_putc(s, p->prefixlen);
stream_put(s, &p->u.prefix, blen);
stream_putl(s, re->table);
stream_putw_at(s, 0, stream_get_endp(s));
return zebra_server_send_message(client, s);
}
void zsend_rule_notify_owner(struct zebra_pbr_rule *rule,
enum zapi_rule_notify_owner note)
{
struct listnode *node;
struct zserv *client;
struct stream *s;
if (IS_ZEBRA_DEBUG_PACKET) {
zlog_debug("%s: Notifying %u",
__PRETTY_FUNCTION__, rule->unique);
}
for (ALL_LIST_ELEMENTS_RO(zebrad.client_list, node, client)) {
if (rule->sock == client->sock)
break;
}
if (!client)
return;
s = stream_new(ZEBRA_MAX_PACKET_SIZ);
stream_reset(s);
zclient_create_header(s, ZEBRA_RULE_NOTIFY_OWNER, VRF_DEFAULT);
stream_put(s, ¬e, sizeof(note));
stream_putl(s, rule->seq);
stream_putl(s, rule->priority);
stream_putl(s, rule->unique);
if (rule->ifp)
stream_putl(s, rule->ifp->ifindex);
else
stream_putl(s, 0);
stream_putw_at(s, 0, stream_get_endp(s));
zebra_server_send_message(client, s);
}
/* Router-id is updated. Send ZEBRA_ROUTER_ID_ADD to client. */
int zsend_router_id_update(struct zserv *client, struct prefix *p,
vrf_id_t vrf_id)
{
int blen;
/* Check this client need interface information. */
if (!vrf_bitmap_check(client->ridinfo, vrf_id))
return 0;
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
/* Message type. */
zclient_create_header(s, ZEBRA_ROUTER_ID_UPDATE, vrf_id);
/* Prefix information. */
stream_putc(s, p->family);
blen = prefix_blen(p);
stream_put(s, &p->u.prefix, blen);
stream_putc(s, p->prefixlen);
/* Write packet size. */
stream_putw_at(s, 0, stream_get_endp(s));
return zebra_server_send_message(client, s);
}
/*
* Function used by Zebra to send a PW status update to LDP daemon
*/
int zsend_pw_update(struct zserv *client, struct zebra_pw *pw)
{
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_PW_STATUS_UPDATE, pw->vrf_id);
stream_write(s, pw->ifname, IF_NAMESIZE);
stream_putl(s, pw->ifindex);
stream_putl(s, pw->status);
/* Put length at the first point of the stream. */
stream_putw_at(s, 0, stream_get_endp(s));
return zebra_server_send_message(client, s);
}
/* Send response to a get label chunk request to client */
static int zsend_assign_label_chunk_response(struct zserv *client,
vrf_id_t vrf_id,
struct label_manager_chunk *lmc)
{
int ret;
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_GET_LABEL_CHUNK, vrf_id);
if (lmc) {
/* keep */
stream_putc(s, lmc->keep);
/* start and end labels */
stream_putl(s, lmc->start);
stream_putl(s, lmc->end);
}
/* Write packet size. */
stream_putw_at(s, 0, stream_get_endp(s));
ret = writen(client->sock, s->data, stream_get_endp(s));
stream_free(s);
return ret;
}
/* Send response to a label manager connect request to client */
static int zsend_label_manager_connect_response(struct zserv *client,
vrf_id_t vrf_id, u_short result)
{
int ret;
struct stream *s = stream_new(ZEBRA_MAX_PACKET_SIZ);
zclient_create_header(s, ZEBRA_LABEL_MANAGER_CONNECT, vrf_id);
/* result */
stream_putc(s, result);
/* Write packet size. */
stream_putw_at(s, 0, stream_get_endp(s));
ret = writen(client->sock, s->data, stream_get_endp(s));
stream_free(s);
return ret;
}
/* Inbound message handling ------------------------------------------------ */
int cmd2type[] = {
[ZEBRA_NEXTHOP_REGISTER] = RNH_NEXTHOP_TYPE,
[ZEBRA_NEXTHOP_UNREGISTER] = RNH_NEXTHOP_TYPE,
[ZEBRA_IMPORT_ROUTE_REGISTER] = RNH_IMPORT_CHECK_TYPE,
[ZEBRA_IMPORT_ROUTE_UNREGISTER] = RNH_IMPORT_CHECK_TYPE,
};
/* Nexthop register */
static void zread_rnh_register(ZAPI_HANDLER_ARGS)
{
struct rnh *rnh;
struct stream *s;
struct prefix p;
u_short l = 0;
u_char flags = 0;
uint16_t type = cmd2type[hdr->command];
if (IS_ZEBRA_DEBUG_NHT)
zlog_debug(
"rnh_register msg from client %s: hdr->length=%d, type=%s\n",
zebra_route_string(client->proto), hdr->length,
(type == RNH_NEXTHOP_TYPE) ? "nexthop" : "route");
s = msg;
client->nh_reg_time = monotime(NULL);
while (l < hdr->length) {
STREAM_GETC(s, flags);
STREAM_GETW(s, p.family);
STREAM_GETC(s, p.prefixlen);
l += 4;
if (p.family == AF_INET) {
if (p.prefixlen > IPV4_MAX_BITLEN) {
zlog_warn(
"%s: Specified prefix hdr->length %d is too large for a v4 address",
__PRETTY_FUNCTION__, p.prefixlen);
return;
}
STREAM_GET(&p.u.prefix4.s_addr, s, IPV4_MAX_BYTELEN);
l += IPV4_MAX_BYTELEN;
} else if (p.family == AF_INET6) {
if (p.prefixlen > IPV6_MAX_BITLEN) {
zlog_warn(
"%s: Specified prefix hdr->length %d is to large for a v6 address",
__PRETTY_FUNCTION__, p.prefixlen);
return;
}
STREAM_GET(&p.u.prefix6, s, IPV6_MAX_BYTELEN);
l += IPV6_MAX_BYTELEN;
} else {
zlog_err(
"rnh_register: Received unknown family type %d\n",
p.family);
return;
}
rnh = zebra_add_rnh(&p, zvrf_id(zvrf), type);
if (type == RNH_NEXTHOP_TYPE) {
if (flags
&& !CHECK_FLAG(rnh->flags, ZEBRA_NHT_CONNECTED))
SET_FLAG(rnh->flags, ZEBRA_NHT_CONNECTED);
else if (!flags
&& CHECK_FLAG(rnh->flags, ZEBRA_NHT_CONNECTED))
UNSET_FLAG(rnh->flags, ZEBRA_NHT_CONNECTED);
} else if (type == RNH_IMPORT_CHECK_TYPE) {
if (flags
&& !CHECK_FLAG(rnh->flags, ZEBRA_NHT_EXACT_MATCH))
SET_FLAG(rnh->flags, ZEBRA_NHT_EXACT_MATCH);
else if (!flags
&& CHECK_FLAG(rnh->flags,
ZEBRA_NHT_EXACT_MATCH))
UNSET_FLAG(rnh->flags, ZEBRA_NHT_EXACT_MATCH);
}
zebra_add_rnh_client(rnh, client, type, zvrf_id(zvrf));
/* Anything not AF_INET/INET6 has been filtered out above */
zebra_evaluate_rnh(zvrf_id(zvrf), p.family, 1, type, &p);
}
stream_failure:
return;
}
/* Nexthop register */
static void zread_rnh_unregister(ZAPI_HANDLER_ARGS)
{
struct rnh *rnh;
struct stream *s;
struct prefix p;
u_short l = 0;
uint16_t type = cmd2type[hdr->command];
if (IS_ZEBRA_DEBUG_NHT)
zlog_debug(
"rnh_unregister msg from client %s: hdr->length=%d\n",
zebra_route_string(client->proto), hdr->length);
s = msg;
while (l < hdr->length) {
uint8_t flags;
STREAM_GETC(s, flags);
if (flags != 0)
goto stream_failure;
STREAM_GETW(s, p.family);
STREAM_GETC(s, p.prefixlen);
l += 4;
if (p.family == AF_INET) {
if (p.prefixlen > IPV4_MAX_BITLEN) {
zlog_warn(
"%s: Specified prefix hdr->length %d is to large for a v4 address",
__PRETTY_FUNCTION__, p.prefixlen);
return;
}
STREAM_GET(&p.u.prefix4.s_addr, s, IPV4_MAX_BYTELEN);
l += IPV4_MAX_BYTELEN;
} else if (p.family == AF_INET6) {
if (p.prefixlen > IPV6_MAX_BITLEN) {
zlog_warn(
"%s: Specified prefix hdr->length %d is to large for a v6 address",
__PRETTY_FUNCTION__, p.prefixlen);
return;
}
STREAM_GET(&p.u.prefix6, s, IPV6_MAX_BYTELEN);
l += IPV6_MAX_BYTELEN;
} else {
zlog_err(
"rnh_register: Received unknown family type %d\n",
p.family);
return;
}
rnh = zebra_lookup_rnh(&p, zvrf_id(zvrf), type);
if (rnh) {
client->nh_dereg_time = monotime(NULL);
zebra_remove_rnh_client(rnh, client, type);
}
}
stream_failure:
return;
}
#define ZEBRA_MIN_FEC_LENGTH 5
/* FEC register */
static void zread_fec_register(ZAPI_HANDLER_ARGS)
{
struct stream *s;
u_short l = 0;
struct prefix p;
uint16_t flags;
uint32_t label_index = MPLS_INVALID_LABEL_INDEX;
s = msg;
zvrf = vrf_info_lookup(VRF_DEFAULT);
if (!zvrf)
return; // unexpected
/*
* The minimum amount of data that can be sent for one fec
* registration
*/
if (hdr->length < ZEBRA_MIN_FEC_LENGTH) {
zlog_err(
"fec_register: Received a fec register of hdr->length %d, it is of insufficient size to properly decode",
hdr->length);
return;