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mirror_frr/zebra/rt_netlink.c
Stephen Worley 5a935f79d5 zebra: Guard nexthop group overflow read 
Guard against an overflow read when processing
nexthop groups from netlink. Add a check to ensure
we don't try to write passed the array size.

Signed-off-by: Stephen Worley <sworley@cumulusnetworks.com>
2019-10-25 11:13:44 -04:00

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/* Kernel routing table updates using netlink over GNU/Linux system.
* 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>
#ifdef HAVE_NETLINK
#include <net/if_arp.h>
#include <linux/lwtunnel.h>
#include <linux/mpls_iptunnel.h>
#include <linux/neighbour.h>
#include <linux/rtnetlink.h>
#include <linux/nexthop.h>
/* Hack for GNU libc version 2. */
#ifndef MSG_TRUNC
#define MSG_TRUNC 0x20
#endif /* MSG_TRUNC */
#include "linklist.h"
#include "if.h"
#include "log.h"
#include "prefix.h"
#include "connected.h"
#include "table.h"
#include "memory.h"
#include "zebra_memory.h"
#include "rib.h"
#include "thread.h"
#include "privs.h"
#include "nexthop.h"
#include "vrf.h"
#include "vty.h"
#include "mpls.h"
#include "vxlan.h"
#include "printfrr.h"
#include "zebra/zapi_msg.h"
#include "zebra/zebra_ns.h"
#include "zebra/zebra_vrf.h"
#include "zebra/rt.h"
#include "zebra/redistribute.h"
#include "zebra/interface.h"
#include "zebra/debug.h"
#include "zebra/rtadv.h"
#include "zebra/zebra_ptm.h"
#include "zebra/zebra_mpls.h"
#include "zebra/kernel_netlink.h"
#include "zebra/rt_netlink.h"
#include "zebra/zebra_nhg.h"
#include "zebra/zebra_mroute.h"
#include "zebra/zebra_vxlan.h"
#include "zebra/zebra_errors.h"
#ifndef AF_MPLS
#define AF_MPLS 28
#endif
static vlanid_t filter_vlan = 0;
static bool supports_nh;
struct gw_family_t {
uint16_t filler;
uint16_t family;
union g_addr gate;
};
char ipv4_ll_buf[16] = "169.254.0.1";
struct in_addr ipv4_ll;
/*
* The ipv4_ll data structure is used for all 5549
* additions to the kernel. Let's figure out the
* correct value one time instead for every
* install/remove of a 5549 type route
*/
void rt_netlink_init(void)
{
inet_pton(AF_INET, ipv4_ll_buf, &ipv4_ll);
}
/*
* Mapping from dataplane neighbor flags to netlink flags
*/
static uint8_t neigh_flags_to_netlink(uint8_t dplane_flags)
{
uint8_t flags = 0;
if (dplane_flags & DPLANE_NTF_EXT_LEARNED)
flags |= NTF_EXT_LEARNED;
if (dplane_flags & DPLANE_NTF_ROUTER)
flags |= NTF_ROUTER;
return flags;
}
/*
* Mapping from dataplane neighbor state to netlink state
*/
static uint16_t neigh_state_to_netlink(uint16_t dplane_state)
{
uint16_t state = 0;
if (dplane_state & DPLANE_NUD_REACHABLE)
state |= NUD_REACHABLE;
if (dplane_state & DPLANE_NUD_STALE)
state |= NUD_STALE;
if (dplane_state & DPLANE_NUD_NOARP)
state |= NUD_NOARP;
if (dplane_state & DPLANE_NUD_PROBE)
state |= NUD_PROBE;
return state;
}
static inline int is_selfroute(int proto)
{
if ((proto == RTPROT_BGP) || (proto == RTPROT_OSPF)
|| (proto == RTPROT_ZSTATIC) || (proto == RTPROT_ZEBRA)
|| (proto == RTPROT_ISIS) || (proto == RTPROT_RIPNG)
|| (proto == RTPROT_NHRP) || (proto == RTPROT_EIGRP)
|| (proto == RTPROT_LDP) || (proto == RTPROT_BABEL)
|| (proto == RTPROT_RIP) || (proto == RTPROT_SHARP)
|| (proto == RTPROT_PBR) || (proto == RTPROT_OPENFABRIC)) {
return 1;
}
return 0;
}
static inline int zebra2proto(int proto)
{
switch (proto) {
case ZEBRA_ROUTE_BABEL:
proto = RTPROT_BABEL;
break;
case ZEBRA_ROUTE_BGP:
proto = RTPROT_BGP;
break;
case ZEBRA_ROUTE_OSPF:
case ZEBRA_ROUTE_OSPF6:
proto = RTPROT_OSPF;
break;
case ZEBRA_ROUTE_STATIC:
proto = RTPROT_ZSTATIC;
break;
case ZEBRA_ROUTE_ISIS:
proto = RTPROT_ISIS;
break;
case ZEBRA_ROUTE_RIP:
proto = RTPROT_RIP;
break;
case ZEBRA_ROUTE_RIPNG:
proto = RTPROT_RIPNG;
break;
case ZEBRA_ROUTE_NHRP:
proto = RTPROT_NHRP;
break;
case ZEBRA_ROUTE_EIGRP:
proto = RTPROT_EIGRP;
break;
case ZEBRA_ROUTE_LDP:
proto = RTPROT_LDP;
break;
case ZEBRA_ROUTE_SHARP:
proto = RTPROT_SHARP;
break;
case ZEBRA_ROUTE_PBR:
proto = RTPROT_PBR;
break;
case ZEBRA_ROUTE_OPENFABRIC:
proto = RTPROT_OPENFABRIC;
break;
case ZEBRA_ROUTE_TABLE:
case ZEBRA_ROUTE_NHG:
proto = RTPROT_ZEBRA;
break;
default:
/*
* When a user adds a new protocol this will show up
* to let them know to do something about it. This
* is intentionally a warn because we should see
* this as part of development of a new protocol
*/
zlog_debug(
"%s: Please add this protocol(%d) to proper rt_netlink.c handling",
__PRETTY_FUNCTION__, proto);
proto = RTPROT_ZEBRA;
break;
}
return proto;
}
static inline int proto2zebra(int proto, int family, bool is_nexthop)
{
switch (proto) {
case RTPROT_BABEL:
proto = ZEBRA_ROUTE_BABEL;
break;
case RTPROT_BGP:
proto = ZEBRA_ROUTE_BGP;
break;
case RTPROT_OSPF:
proto = (family == AFI_IP) ? ZEBRA_ROUTE_OSPF
: ZEBRA_ROUTE_OSPF6;
break;
case RTPROT_ISIS:
proto = ZEBRA_ROUTE_ISIS;
break;
case RTPROT_RIP:
proto = ZEBRA_ROUTE_RIP;
break;
case RTPROT_RIPNG:
proto = ZEBRA_ROUTE_RIPNG;
break;
case RTPROT_NHRP:
proto = ZEBRA_ROUTE_NHRP;
break;
case RTPROT_EIGRP:
proto = ZEBRA_ROUTE_EIGRP;
break;
case RTPROT_LDP:
proto = ZEBRA_ROUTE_LDP;
break;
case RTPROT_STATIC:
case RTPROT_ZSTATIC:
proto = ZEBRA_ROUTE_STATIC;
break;
case RTPROT_SHARP:
proto = ZEBRA_ROUTE_SHARP;
break;
case RTPROT_PBR:
proto = ZEBRA_ROUTE_PBR;
break;
case RTPROT_OPENFABRIC:
proto = ZEBRA_ROUTE_OPENFABRIC;
break;
case RTPROT_ZEBRA:
if (is_nexthop) {
proto = ZEBRA_ROUTE_NHG;
break;
}
/* Intentional fall thru */
default:
/*
* When a user adds a new protocol this will show up
* to let them know to do something about it. This
* is intentionally a warn because we should see
* this as part of development of a new protocol
*/
zlog_debug(
"%s: Please add this protocol(%d) to proper rt_netlink.c handling",
__PRETTY_FUNCTION__, proto);
proto = ZEBRA_ROUTE_KERNEL;
break;
}
return proto;
}
/*
Pending: create an efficient table_id (in a tree/hash) based lookup)
*/
static vrf_id_t vrf_lookup_by_table(uint32_t table_id, ns_id_t ns_id)
{
struct vrf *vrf;
struct zebra_vrf *zvrf;
RB_FOREACH (vrf, vrf_id_head, &vrfs_by_id) {
zvrf = vrf->info;
if (zvrf == NULL)
continue;
/* case vrf with netns : match the netnsid */
if (vrf_is_backend_netns()) {
if (ns_id == zvrf_id(zvrf))
return zvrf_id(zvrf);
} else {
/* VRF is VRF_BACKEND_VRF_LITE */
if (zvrf->table_id != table_id)
continue;
return zvrf_id(zvrf);
}
}
return VRF_DEFAULT;
}
/**
* @parse_encap_mpls() - Parses encapsulated mpls attributes
* @tb: Pointer to rtattr to look for nested items in.
* @labels: Pointer to store labels in.
*
* Return: Number of mpls labels found.
*/
static int parse_encap_mpls(struct rtattr *tb, mpls_label_t *labels)
{
struct rtattr *tb_encap[MPLS_IPTUNNEL_MAX + 1] = {0};
mpls_lse_t *lses = NULL;
int num_labels = 0;
uint32_t ttl = 0;
uint32_t bos = 0;
uint32_t exp = 0;
mpls_label_t label = 0;
netlink_parse_rtattr_nested(tb_encap, MPLS_IPTUNNEL_MAX, tb);
lses = (mpls_lse_t *)RTA_DATA(tb_encap[MPLS_IPTUNNEL_DST]);
while (!bos && num_labels < MPLS_MAX_LABELS) {
mpls_lse_decode(lses[num_labels], &label, &ttl, &exp, &bos);
labels[num_labels++] = label;
}
return num_labels;
}
static struct nexthop
parse_nexthop_unicast(ns_id_t ns_id, struct rtmsg *rtm, struct rtattr **tb,
enum blackhole_type bh_type, int index, void *prefsrc,
void *gate, afi_t afi, vrf_id_t vrf_id)
{
struct interface *ifp = NULL;
struct nexthop nh = {0};
mpls_label_t labels[MPLS_MAX_LABELS] = {0};
int num_labels = 0;
vrf_id_t nh_vrf_id = vrf_id;
size_t sz = (afi == AFI_IP) ? 4 : 16;
if (bh_type == BLACKHOLE_UNSPEC) {
if (index && !gate)
nh.type = NEXTHOP_TYPE_IFINDEX;
else if (index && gate)
nh.type = (afi == AFI_IP) ? NEXTHOP_TYPE_IPV4_IFINDEX
: NEXTHOP_TYPE_IPV6_IFINDEX;
else if (!index && gate)
nh.type = (afi == AFI_IP) ? NEXTHOP_TYPE_IPV4
: NEXTHOP_TYPE_IPV6;
else {
nh.type = NEXTHOP_TYPE_BLACKHOLE;
nh.bh_type = bh_type;
}
} else {
nh.type = NEXTHOP_TYPE_BLACKHOLE;
nh.bh_type = bh_type;
}
nh.ifindex = index;
if (prefsrc)
memcpy(&nh.src, prefsrc, sz);
if (gate)
memcpy(&nh.gate, gate, sz);
if (index) {
ifp = if_lookup_by_index_per_ns(zebra_ns_lookup(ns_id), index);
if (ifp)
nh_vrf_id = ifp->vrf_id;
}
nh.vrf_id = nh_vrf_id;
if (tb[RTA_ENCAP] && tb[RTA_ENCAP_TYPE]
&& *(uint16_t *)RTA_DATA(tb[RTA_ENCAP_TYPE])
== LWTUNNEL_ENCAP_MPLS) {
num_labels = parse_encap_mpls(tb[RTA_ENCAP], labels);
}
if (rtm->rtm_flags & RTNH_F_ONLINK)
SET_FLAG(nh.flags, NEXTHOP_FLAG_ONLINK);
if (num_labels)
nexthop_add_labels(&nh, ZEBRA_LSP_STATIC, num_labels, labels);
return nh;
}
static uint8_t parse_multipath_nexthops_unicast(ns_id_t ns_id,
struct route_entry *re,
struct rtmsg *rtm,
struct rtnexthop *rtnh,
struct rtattr **tb,
void *prefsrc, vrf_id_t vrf_id)
{
void *gate = NULL;
struct interface *ifp = NULL;
int index = 0;
/* MPLS labels */
mpls_label_t labels[MPLS_MAX_LABELS] = {0};
int num_labels = 0;
struct rtattr *rtnh_tb[RTA_MAX + 1] = {};
int len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
vrf_id_t nh_vrf_id = vrf_id;
re->ng = nexthop_group_new();
for (;;) {
struct nexthop *nh = NULL;
if (len < (int)sizeof(*rtnh) || rtnh->rtnh_len > len)
break;
index = rtnh->rtnh_ifindex;
if (index) {
/*
* Yes we are looking this up
* for every nexthop and just
* using the last one looked
* up right now
*/
ifp = if_lookup_by_index_per_ns(zebra_ns_lookup(ns_id),
index);
if (ifp)
nh_vrf_id = ifp->vrf_id;
else {
flog_warn(
EC_ZEBRA_UNKNOWN_INTERFACE,
"%s: Unknown interface %u specified, defaulting to VRF_DEFAULT",
__PRETTY_FUNCTION__, index);
nh_vrf_id = VRF_DEFAULT;
}
} else
nh_vrf_id = vrf_id;
if (rtnh->rtnh_len > sizeof(*rtnh)) {
memset(rtnh_tb, 0, sizeof(rtnh_tb));
netlink_parse_rtattr(rtnh_tb, RTA_MAX, RTNH_DATA(rtnh),
rtnh->rtnh_len - sizeof(*rtnh));
if (rtnh_tb[RTA_GATEWAY])
gate = RTA_DATA(rtnh_tb[RTA_GATEWAY]);
if (rtnh_tb[RTA_ENCAP] && rtnh_tb[RTA_ENCAP_TYPE]
&& *(uint16_t *)RTA_DATA(rtnh_tb[RTA_ENCAP_TYPE])
== LWTUNNEL_ENCAP_MPLS) {
num_labels = parse_encap_mpls(
rtnh_tb[RTA_ENCAP], labels);
}
}
if (gate) {
if (rtm->rtm_family == AF_INET) {
if (index)
nh = route_entry_nexthop_ipv4_ifindex_add(
re, gate, prefsrc, index,
nh_vrf_id);
else
nh = route_entry_nexthop_ipv4_add(
re, gate, prefsrc, nh_vrf_id);
} else if (rtm->rtm_family == AF_INET6) {
if (index)
nh = route_entry_nexthop_ipv6_ifindex_add(
re, gate, index, nh_vrf_id);
else
nh = route_entry_nexthop_ipv6_add(
re, gate, nh_vrf_id);
}
} else
nh = route_entry_nexthop_ifindex_add(re, index,
nh_vrf_id);
if (nh) {
if (num_labels)
nexthop_add_labels(nh, ZEBRA_LSP_STATIC,
num_labels, labels);
if (rtnh->rtnh_flags & RTNH_F_ONLINK)
SET_FLAG(nh->flags, NEXTHOP_FLAG_ONLINK);
}
if (rtnh->rtnh_len == 0)
break;
len -= NLMSG_ALIGN(rtnh->rtnh_len);
rtnh = RTNH_NEXT(rtnh);
}
uint8_t nhop_num = nexthop_group_nexthop_num(re->ng);
if (!nhop_num)
nexthop_group_delete(&re->ng);
return nhop_num;
}
/* Looking up routing table by netlink interface. */
static int netlink_route_change_read_unicast(struct nlmsghdr *h, ns_id_t ns_id,
int startup)
{
int len;
struct rtmsg *rtm;
struct rtattr *tb[RTA_MAX + 1];
uint8_t flags = 0;
struct prefix p;
struct prefix_ipv6 src_p = {};
vrf_id_t vrf_id;
char anyaddr[16] = {0};
int proto = ZEBRA_ROUTE_KERNEL;
int index = 0;
int table;
int metric = 0;
uint32_t mtu = 0;
uint8_t distance = 0;
route_tag_t tag = 0;
uint32_t nhe_id = 0;
void *dest = NULL;
void *gate = NULL;
void *prefsrc = NULL; /* IPv4 preferred source host address */
void *src = NULL; /* IPv6 srcdest source prefix */
enum blackhole_type bh_type = BLACKHOLE_UNSPEC;
rtm = NLMSG_DATA(h);
if (startup && h->nlmsg_type != RTM_NEWROUTE)
return 0;
switch (rtm->rtm_type) {
case RTN_UNICAST:
break;
case RTN_BLACKHOLE:
bh_type = BLACKHOLE_NULL;
break;
case RTN_UNREACHABLE:
bh_type = BLACKHOLE_REJECT;
break;
case RTN_PROHIBIT:
bh_type = BLACKHOLE_ADMINPROHIB;
break;
default:
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Route rtm_type: %s(%d) intentionally ignoring",
nl_rttype_to_str(rtm->rtm_type),
rtm->rtm_type);
return 0;
}
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct rtmsg));
if (len < 0) {
zlog_err("%s: Message received from netlink is of a broken size %d %zu",
__PRETTY_FUNCTION__, h->nlmsg_len,
(size_t)NLMSG_LENGTH(sizeof(struct rtmsg)));
return -1;
}
memset(tb, 0, sizeof tb);
netlink_parse_rtattr(tb, RTA_MAX, RTM_RTA(rtm), len);
if (rtm->rtm_flags & RTM_F_CLONED)
return 0;
if (rtm->rtm_protocol == RTPROT_REDIRECT)
return 0;
if (rtm->rtm_protocol == RTPROT_KERNEL)
return 0;
if (!startup && is_selfroute(rtm->rtm_protocol)
&& h->nlmsg_type == RTM_NEWROUTE) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Route type: %d Received that we think we have originated, ignoring",
rtm->rtm_protocol);
return 0;
}
/* We don't care about change notifications for the MPLS table. */
/* TODO: Revisit this. */
if (rtm->rtm_family == AF_MPLS)
return 0;
/* Table corresponding to route. */
if (tb[RTA_TABLE])
table = *(int *)RTA_DATA(tb[RTA_TABLE]);
else
table = rtm->rtm_table;
/* Map to VRF */
vrf_id = vrf_lookup_by_table(table, ns_id);
if (vrf_id == VRF_DEFAULT) {
if (!is_zebra_valid_kernel_table(table)
&& !is_zebra_main_routing_table(table))
return 0;
}
/* Route which inserted by Zebra. */
if (is_selfroute(rtm->rtm_protocol)) {
flags |= ZEBRA_FLAG_SELFROUTE;
proto = proto2zebra(rtm->rtm_protocol, rtm->rtm_family, false);
}
if (tb[RTA_OIF])
index = *(int *)RTA_DATA(tb[RTA_OIF]);
if (tb[RTA_DST])
dest = RTA_DATA(tb[RTA_DST]);
else
dest = anyaddr;
if (tb[RTA_SRC])
src = RTA_DATA(tb[RTA_SRC]);
else
src = anyaddr;
if (tb[RTA_PREFSRC])
prefsrc = RTA_DATA(tb[RTA_PREFSRC]);
if (tb[RTA_GATEWAY])
gate = RTA_DATA(tb[RTA_GATEWAY]);
if (tb[RTA_NH_ID])
nhe_id = *(uint32_t *)RTA_DATA(tb[RTA_NH_ID]);
if (tb[RTA_PRIORITY])
metric = *(int *)RTA_DATA(tb[RTA_PRIORITY]);
#if defined(SUPPORT_REALMS)
if (tb[RTA_FLOW])
tag = *(uint32_t *)RTA_DATA(tb[RTA_FLOW]);
#endif
if (tb[RTA_METRICS]) {
struct rtattr *mxrta[RTAX_MAX + 1];
memset(mxrta, 0, sizeof mxrta);
netlink_parse_rtattr(mxrta, RTAX_MAX, RTA_DATA(tb[RTA_METRICS]),
RTA_PAYLOAD(tb[RTA_METRICS]));
if (mxrta[RTAX_MTU])
mtu = *(uint32_t *)RTA_DATA(mxrta[RTAX_MTU]);
}
if (rtm->rtm_family == AF_INET) {
p.family = AF_INET;
if (rtm->rtm_dst_len > IPV4_MAX_BITLEN) {
zlog_err(
"Invalid destination prefix length: %u received from kernel route change",
rtm->rtm_dst_len);
return -1;
}
memcpy(&p.u.prefix4, dest, 4);
p.prefixlen = rtm->rtm_dst_len;
if (rtm->rtm_src_len != 0) {
char buf[PREFIX_STRLEN];
flog_warn(
EC_ZEBRA_UNSUPPORTED_V4_SRCDEST,
"unsupported IPv4 sourcedest route (dest %s vrf %u)",
prefix2str(&p, buf, sizeof(buf)), vrf_id);
return 0;
}
/* Force debug below to not display anything for source */
src_p.prefixlen = 0;
} else if (rtm->rtm_family == AF_INET6) {
p.family = AF_INET6;
if (rtm->rtm_dst_len > IPV6_MAX_BITLEN) {
zlog_err(
"Invalid destination prefix length: %u received from kernel route change",
rtm->rtm_dst_len);
return -1;
}
memcpy(&p.u.prefix6, dest, 16);
p.prefixlen = rtm->rtm_dst_len;
src_p.family = AF_INET6;
if (rtm->rtm_src_len > IPV6_MAX_BITLEN) {
zlog_err(
"Invalid source prefix length: %u received from kernel route change",
rtm->rtm_src_len);
return -1;
}
memcpy(&src_p.prefix, src, 16);
src_p.prefixlen = rtm->rtm_src_len;
}
/*
* For ZEBRA_ROUTE_KERNEL types:
*
* The metric/priority of the route received from the kernel
* is a 32 bit number. We are going to interpret the high
* order byte as the Admin Distance and the low order 3 bytes
* as the metric.
*
* This will allow us to do two things:
* 1) Allow the creation of kernel routes that can be
* overridden by zebra.
* 2) Allow the old behavior for 'most' kernel route types
* if a user enters 'ip route ...' v4 routes get a metric
* of 0 and v6 routes get a metric of 1024. Both of these
* values will end up with a admin distance of 0, which
* will cause them to win for the purposes of zebra.
*/
if (proto == ZEBRA_ROUTE_KERNEL) {
distance = (metric >> 24) & 0xFF;
metric = (metric & 0x00FFFFFF);
}
if (IS_ZEBRA_DEBUG_KERNEL) {
char buf[PREFIX_STRLEN];
char buf2[PREFIX_STRLEN];
zlog_debug("%s %s%s%s vrf %u(%u) metric: %d Admin Distance: %d",
nl_msg_type_to_str(h->nlmsg_type),
prefix2str(&p, buf, sizeof(buf)),
src_p.prefixlen ? " from " : "",
src_p.prefixlen
? prefix2str(&src_p, buf2, sizeof(buf2))
: "",
vrf_id, table, metric, distance);
}
afi_t afi = AFI_IP;
if (rtm->rtm_family == AF_INET6)
afi = AFI_IP6;
if (h->nlmsg_type == RTM_NEWROUTE) {
if (!tb[RTA_MULTIPATH]) {
struct nexthop nh = {0};
if (!nhe_id) {
nh = parse_nexthop_unicast(
ns_id, rtm, tb, bh_type, index, prefsrc,
gate, afi, vrf_id);
}
rib_add(afi, SAFI_UNICAST, vrf_id, proto, 0, flags, &p,
&src_p, &nh, nhe_id, table, metric, mtu,
distance, tag);
} else {
/* This is a multipath route */
struct route_entry *re;
struct rtnexthop *rtnh =
(struct rtnexthop *)RTA_DATA(tb[RTA_MULTIPATH]);
re = XCALLOC(MTYPE_RE, sizeof(struct route_entry));
re->type = proto;
re->distance = distance;
re->flags = flags;
re->metric = metric;
re->mtu = mtu;
re->vrf_id = vrf_id;
re->table = table;
re->uptime = monotime(NULL);
re->tag = tag;
re->nhe_id = nhe_id;
if (!nhe_id) {
uint8_t nhop_num =
parse_multipath_nexthops_unicast(
ns_id, re, rtm, rtnh, tb,
prefsrc, vrf_id);
zserv_nexthop_num_warn(
__func__, (const struct prefix *)&p,
nhop_num);
}
if (nhe_id || re->ng)
rib_add_multipath(afi, SAFI_UNICAST, &p,
&src_p, re);
else
XFREE(MTYPE_RE, re);
}
} else {
if (nhe_id) {
rib_delete(afi, SAFI_UNICAST, vrf_id, proto, 0, flags,
&p, &src_p, NULL, nhe_id, table, metric,
distance, true);
} else {
if (!tb[RTA_MULTIPATH]) {
struct nexthop nh;
size_t sz = (afi == AFI_IP) ? 4 : 16;
memset(&nh, 0, sizeof(nh));
if (bh_type == BLACKHOLE_UNSPEC) {
if (index && !gate)
nh.type = NEXTHOP_TYPE_IFINDEX;
else if (index && gate)
nh.type =
(afi == AFI_IP)
? NEXTHOP_TYPE_IPV4_IFINDEX
: NEXTHOP_TYPE_IPV6_IFINDEX;
else if (!index && gate)
nh.type =
(afi == AFI_IP)
? NEXTHOP_TYPE_IPV4
: NEXTHOP_TYPE_IPV6;
else {
nh.type =
NEXTHOP_TYPE_BLACKHOLE;
nh.bh_type = BLACKHOLE_UNSPEC;
}
} else {
nh.type = NEXTHOP_TYPE_BLACKHOLE;
nh.bh_type = bh_type;
}
nh.ifindex = index;
if (gate)
memcpy(&nh.gate, gate, sz);
rib_delete(afi, SAFI_UNICAST, vrf_id, proto, 0,
flags, &p, &src_p, &nh, 0, table,
metric, distance, true);
} else {
/* XXX: need to compare the entire list of
* nexthops here for NLM_F_APPEND stupidity */
rib_delete(afi, SAFI_UNICAST, vrf_id, proto, 0,
flags, &p, &src_p, NULL, 0, table,
metric, distance, true);
}
}
}
return 0;
}
static struct mcast_route_data *mroute = NULL;
static int netlink_route_change_read_multicast(struct nlmsghdr *h,
ns_id_t ns_id, int startup)
{
int len;
struct rtmsg *rtm;
struct rtattr *tb[RTA_MAX + 1];
struct mcast_route_data *m;
struct mcast_route_data mr;
int iif = 0;
int count;
int oif[256];
int oif_count = 0;
char sbuf[40];
char gbuf[40];
char oif_list[256] = "\0";
vrf_id_t vrf;
int table;
if (mroute)
m = mroute;
else {
memset(&mr, 0, sizeof(mr));
m = &mr;
}
rtm = NLMSG_DATA(h);
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct rtmsg));
memset(tb, 0, sizeof tb);
netlink_parse_rtattr(tb, RTA_MAX, RTM_RTA(rtm), len);
if (tb[RTA_TABLE])
table = *(int *)RTA_DATA(tb[RTA_TABLE]);
else
table = rtm->rtm_table;
vrf = vrf_lookup_by_table(table, ns_id);
if (tb[RTA_IIF])
iif = *(int *)RTA_DATA(tb[RTA_IIF]);
if (tb[RTA_SRC])
m->sg.src = *(struct in_addr *)RTA_DATA(tb[RTA_SRC]);
if (tb[RTA_DST])
m->sg.grp = *(struct in_addr *)RTA_DATA(tb[RTA_DST]);
if (tb[RTA_EXPIRES])
m->lastused = *(unsigned long long *)RTA_DATA(tb[RTA_EXPIRES]);
if (tb[RTA_MULTIPATH]) {
struct rtnexthop *rtnh =
(struct rtnexthop *)RTA_DATA(tb[RTA_MULTIPATH]);
len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
for (;;) {
if (len < (int)sizeof(*rtnh) || rtnh->rtnh_len > len)
break;
oif[oif_count] = rtnh->rtnh_ifindex;
oif_count++;
if (rtnh->rtnh_len == 0)
break;
len -= NLMSG_ALIGN(rtnh->rtnh_len);
rtnh = RTNH_NEXT(rtnh);
}
}
if (IS_ZEBRA_DEBUG_KERNEL) {
struct interface *ifp = NULL;
struct zebra_vrf *zvrf = NULL;
strlcpy(sbuf, inet_ntoa(m->sg.src), sizeof(sbuf));
strlcpy(gbuf, inet_ntoa(m->sg.grp), sizeof(gbuf));
for (count = 0; count < oif_count; count++) {
ifp = if_lookup_by_index(oif[count], vrf);
char temp[256];
sprintf(temp, "%s(%d) ", ifp ? ifp->name : "Unknown",
oif[count]);
strlcat(oif_list, temp, sizeof(oif_list));
}
zvrf = zebra_vrf_lookup_by_id(vrf);
ifp = if_lookup_by_index(iif, vrf);
zlog_debug(
"MCAST VRF: %s(%d) %s (%s,%s) IIF: %s(%d) OIF: %s jiffies: %lld",
(zvrf ? zvrf->vrf->name : "Unknown"), vrf,
nl_msg_type_to_str(h->nlmsg_type), sbuf, gbuf,
ifp ? ifp->name : "Unknown", iif, oif_list,
m->lastused);
}
return 0;
}
int netlink_route_change(struct nlmsghdr *h, ns_id_t ns_id, int startup)
{
int len;
struct rtmsg *rtm;
rtm = NLMSG_DATA(h);
if (!(h->nlmsg_type == RTM_NEWROUTE || h->nlmsg_type == RTM_DELROUTE)) {
/* If this is not route add/delete message print warning. */
zlog_debug("Kernel message: %s NS %u",
nl_msg_type_to_str(h->nlmsg_type), ns_id);
return 0;
}
if (!(rtm->rtm_family == AF_INET ||
rtm->rtm_family == AF_INET6 ||
rtm->rtm_family == RTNL_FAMILY_IPMR )) {
flog_warn(
EC_ZEBRA_UNKNOWN_FAMILY,
"Invalid address family: %u received from kernel route change: %s",
rtm->rtm_family, nl_msg_type_to_str(h->nlmsg_type));
return 0;
}
/* Connected route. */
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s %s %s proto %s NS %u",
nl_msg_type_to_str(h->nlmsg_type),
nl_family_to_str(rtm->rtm_family),
nl_rttype_to_str(rtm->rtm_type),
nl_rtproto_to_str(rtm->rtm_protocol), ns_id);
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct rtmsg));
if (len < 0) {
zlog_err("%s: Message received from netlink is of a broken size: %d %zu",
__PRETTY_FUNCTION__,
h->nlmsg_len,
(size_t)NLMSG_LENGTH(sizeof(struct rtmsg)));
return -1;
}
if (rtm->rtm_type == RTN_MULTICAST)
netlink_route_change_read_multicast(h, ns_id, startup);
else
netlink_route_change_read_unicast(h, ns_id, startup);
return 0;
}
/* Request for specific route information from the kernel */
static int netlink_request_route(struct zebra_ns *zns, int family, int type)
{
struct {
struct nlmsghdr n;
struct rtmsg rtm;
} req;
/* Form the request, specifying filter (rtattr) if needed. */
memset(&req, 0, sizeof(req));
req.n.nlmsg_type = type;
req.n.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
req.rtm.rtm_family = family;
return netlink_request(&zns->netlink_cmd, &req.n);
}
/* Routing table read function using netlink interface. Only called
bootstrap time. */
int netlink_route_read(struct zebra_ns *zns)
{
int ret;
struct zebra_dplane_info dp_info;
zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
/* Get IPv4 routing table. */
ret = netlink_request_route(zns, AF_INET, RTM_GETROUTE);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_route_change_read_unicast,
&zns->netlink_cmd, &dp_info, 0, 1);
if (ret < 0)
return ret;
/* Get IPv6 routing table. */
ret = netlink_request_route(zns, AF_INET6, RTM_GETROUTE);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_route_change_read_unicast,
&zns->netlink_cmd, &dp_info, 0, 1);
if (ret < 0)
return ret;
return 0;
}
static void _netlink_route_nl_add_gateway_info(uint8_t route_family,
uint8_t gw_family,
struct nlmsghdr *nlmsg,
size_t req_size, int bytelen,
const struct nexthop *nexthop)
{
if (route_family == AF_MPLS) {
struct gw_family_t gw_fam;
gw_fam.family = gw_family;
if (gw_family == AF_INET)
memcpy(&gw_fam.gate.ipv4, &nexthop->gate.ipv4, bytelen);
else
memcpy(&gw_fam.gate.ipv6, &nexthop->gate.ipv6, bytelen);
addattr_l(nlmsg, req_size, RTA_VIA, &gw_fam.family,
bytelen + 2);
} else {
if (gw_family == AF_INET)
addattr_l(nlmsg, req_size, RTA_GATEWAY,
&nexthop->gate.ipv4, bytelen);
else
addattr_l(nlmsg, req_size, RTA_GATEWAY,
&nexthop->gate.ipv6, bytelen);
}
}
static void _netlink_route_rta_add_gateway_info(uint8_t route_family,
uint8_t gw_family,
struct rtattr *rta,
struct rtnexthop *rtnh,
size_t req_size, int bytelen,
const struct nexthop *nexthop)
{
if (route_family == AF_MPLS) {
struct gw_family_t gw_fam;
gw_fam.family = gw_family;
if (gw_family == AF_INET)
memcpy(&gw_fam.gate.ipv4, &nexthop->gate.ipv4, bytelen);
else
memcpy(&gw_fam.gate.ipv6, &nexthop->gate.ipv6, bytelen);
rta_addattr_l(rta, req_size, RTA_VIA, &gw_fam.family,
bytelen + 2);
rtnh->rtnh_len += RTA_LENGTH(bytelen + 2);
} else {
if (gw_family == AF_INET)
rta_addattr_l(rta, req_size, RTA_GATEWAY,
&nexthop->gate.ipv4, bytelen);
else
rta_addattr_l(rta, req_size, RTA_GATEWAY,
&nexthop->gate.ipv6, bytelen);
rtnh->rtnh_len += sizeof(struct rtattr) + bytelen;
}
}
static int build_label_stack(struct mpls_label_stack *nh_label,
mpls_lse_t *out_lse, char *label_buf,
size_t label_buf_size)
{
char label_buf1[20];
int num_labels = 0;
for (int i = 0; nh_label && i < nh_label->num_labels; i++) {
if (nh_label->label[i] == MPLS_LABEL_IMPLICIT_NULL)
continue;
if (IS_ZEBRA_DEBUG_KERNEL) {
if (!num_labels)
sprintf(label_buf, "label %u",
nh_label->label[i]);
else {
sprintf(label_buf1, "/%u", nh_label->label[i]);
strlcat(label_buf, label_buf1, label_buf_size);
}
}
out_lse[num_labels] =
mpls_lse_encode(nh_label->label[i], 0, 0, 0);
num_labels++;
}
return num_labels;
}
/* This function takes a nexthop as argument and adds
* the appropriate netlink attributes to an existing
* netlink message.
*
* @param routedesc: Human readable description of route type
* (direct/recursive, single-/multipath)
* @param bytelen: Length of addresses in bytes.
* @param nexthop: Nexthop information
* @param nlmsg: nlmsghdr structure to fill in.
* @param req_size: The size allocated for the message.
*/
static void _netlink_route_build_singlepath(const char *routedesc, int bytelen,
const struct nexthop *nexthop,
struct nlmsghdr *nlmsg,
struct rtmsg *rtmsg,
size_t req_size, int cmd)
{
mpls_lse_t out_lse[MPLS_MAX_LABELS];
char label_buf[256];
int num_labels = 0;
assert(nexthop);
/*
* label_buf is *only* currently used within debugging.
* As such when we assign it we are guarding it inside
* a debug test. If you want to change this make sure
* you fix this assumption
*/
label_buf[0] = '\0';
num_labels = build_label_stack(nexthop->nh_label, out_lse, label_buf,
sizeof(label_buf));
if (num_labels) {
/* Set the BoS bit */
out_lse[num_labels - 1] |= htonl(1 << MPLS_LS_S_SHIFT);
if (rtmsg->rtm_family == AF_MPLS)
addattr_l(nlmsg, req_size, RTA_NEWDST, &out_lse,
num_labels * sizeof(mpls_lse_t));
else {
struct rtattr *nest;
uint16_t encap = LWTUNNEL_ENCAP_MPLS;
addattr_l(nlmsg, req_size, RTA_ENCAP_TYPE, &encap,
sizeof(uint16_t));
nest = addattr_nest(nlmsg, req_size, RTA_ENCAP);
addattr_l(nlmsg, req_size, MPLS_IPTUNNEL_DST, &out_lse,
num_labels * sizeof(mpls_lse_t));
addattr_nest_end(nlmsg, nest);
}
}
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ONLINK))
rtmsg->rtm_flags |= RTNH_F_ONLINK;
if (rtmsg->rtm_family == AF_INET
&& (nexthop->type == NEXTHOP_TYPE_IPV6
|| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)) {
rtmsg->rtm_flags |= RTNH_F_ONLINK;
addattr_l(nlmsg, req_size, RTA_GATEWAY, &ipv4_ll, 4);
addattr32(nlmsg, req_size, RTA_OIF, nexthop->ifindex);
if (nexthop->rmap_src.ipv4.s_addr && (cmd == RTM_NEWROUTE))
addattr_l(nlmsg, req_size, RTA_PREFSRC,
&nexthop->rmap_src.ipv4, bytelen);
else if (nexthop->src.ipv4.s_addr && (cmd == RTM_NEWROUTE))
addattr_l(nlmsg, req_size, RTA_PREFSRC,
&nexthop->src.ipv4, bytelen);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
" 5549: _netlink_route_build_singlepath() (%s): "
"nexthop via %s %s if %u(%u)",
routedesc, ipv4_ll_buf, label_buf,
nexthop->ifindex, nexthop->vrf_id);
return;
}
if (nexthop->type == NEXTHOP_TYPE_IPV4
|| nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) {
/* Send deletes to the kernel without specifying the next-hop */
if (cmd != RTM_DELROUTE)
_netlink_route_nl_add_gateway_info(
rtmsg->rtm_family, AF_INET, nlmsg, req_size,
bytelen, nexthop);
if (cmd == RTM_NEWROUTE) {
if (nexthop->rmap_src.ipv4.s_addr)
addattr_l(nlmsg, req_size, RTA_PREFSRC,
&nexthop->rmap_src.ipv4, bytelen);
else if (nexthop->src.ipv4.s_addr)
addattr_l(nlmsg, req_size, RTA_PREFSRC,
&nexthop->src.ipv4, bytelen);
}
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"netlink_route_multipath() (%s): "
"nexthop via %s %s if %u(%u)",
routedesc, inet_ntoa(nexthop->gate.ipv4),
label_buf, nexthop->ifindex, nexthop->vrf_id);
}
if (nexthop->type == NEXTHOP_TYPE_IPV6
|| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) {
_netlink_route_nl_add_gateway_info(rtmsg->rtm_family, AF_INET6,
nlmsg, req_size, bytelen,
nexthop);
if (cmd == RTM_NEWROUTE) {
if (!IN6_IS_ADDR_UNSPECIFIED(&nexthop->rmap_src.ipv6))
addattr_l(nlmsg, req_size, RTA_PREFSRC,
&nexthop->rmap_src.ipv6, bytelen);
else if (!IN6_IS_ADDR_UNSPECIFIED(&nexthop->src.ipv6))
addattr_l(nlmsg, req_size, RTA_PREFSRC,
&nexthop->src.ipv6, bytelen);
}
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"netlink_route_multipath() (%s): "
"nexthop via %s %s if %u(%u)",
routedesc, inet6_ntoa(nexthop->gate.ipv6),
label_buf, nexthop->ifindex, nexthop->vrf_id);
}
/*
* We have the ifindex so we should always send it
* This is especially useful if we are doing route
* leaking.
*/
if (nexthop->type != NEXTHOP_TYPE_BLACKHOLE)
addattr32(nlmsg, req_size, RTA_OIF, nexthop->ifindex);
if (nexthop->type == NEXTHOP_TYPE_IFINDEX) {
if (cmd == RTM_NEWROUTE) {
if (nexthop->rmap_src.ipv4.s_addr)
addattr_l(nlmsg, req_size, RTA_PREFSRC,
&nexthop->rmap_src.ipv4, bytelen);
else if (nexthop->src.ipv4.s_addr)
addattr_l(nlmsg, req_size, RTA_PREFSRC,
&nexthop->src.ipv4, bytelen);
}
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"netlink_route_multipath() (%s): "
"nexthop via if %u(%u)",
routedesc, nexthop->ifindex, nexthop->vrf_id);
}
}
/* This function takes a nexthop as argument and
* appends to the given rtattr/rtnexthop pair the
* representation of the nexthop. If the nexthop
* defines a preferred source, the src parameter
* will be modified to point to that src, otherwise
* it will be kept unmodified.
*
* @param routedesc: Human readable description of route type
* (direct/recursive, single-/multipath)
* @param bytelen: Length of addresses in bytes.
* @param nexthop: Nexthop information
* @param rta: rtnetlink attribute structure
* @param rtnh: pointer to an rtnetlink nexthop structure
* @param src: pointer pointing to a location where
* the prefsrc should be stored.
*/
static void _netlink_route_build_multipath(const char *routedesc, int bytelen,
const struct nexthop *nexthop,
struct rtattr *rta,
struct rtnexthop *rtnh,
struct rtmsg *rtmsg,
const union g_addr **src)
{
mpls_lse_t out_lse[MPLS_MAX_LABELS];
char label_buf[256];
int num_labels = 0;
rtnh->rtnh_len = sizeof(*rtnh);
rtnh->rtnh_flags = 0;
rtnh->rtnh_hops = 0;
rta->rta_len += rtnh->rtnh_len;
assert(nexthop);
/*
* label_buf is *only* currently used within debugging.
* As such when we assign it we are guarding it inside
* a debug test. If you want to change this make sure
* you fix this assumption
*/
label_buf[0] = '\0';
num_labels = build_label_stack(nexthop->nh_label, out_lse, label_buf,
sizeof(label_buf));
if (num_labels) {
/* Set the BoS bit */
out_lse[num_labels - 1] |= htonl(1 << MPLS_LS_S_SHIFT);
if (rtmsg->rtm_family == AF_MPLS) {
rta_addattr_l(rta, NL_PKT_BUF_SIZE, RTA_NEWDST,
&out_lse,
num_labels * sizeof(mpls_lse_t));
rtnh->rtnh_len +=
RTA_LENGTH(num_labels * sizeof(mpls_lse_t));
} else {
struct rtattr *nest;
uint16_t encap = LWTUNNEL_ENCAP_MPLS;
int len = rta->rta_len;
rta_addattr_l(rta, NL_PKT_BUF_SIZE, RTA_ENCAP_TYPE,
&encap, sizeof(uint16_t));
nest = rta_nest(rta, NL_PKT_BUF_SIZE, RTA_ENCAP);
rta_addattr_l(rta, NL_PKT_BUF_SIZE, MPLS_IPTUNNEL_DST,
&out_lse,
num_labels * sizeof(mpls_lse_t));
rta_nest_end(rta, nest);
rtnh->rtnh_len += rta->rta_len - len;
}
}
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ONLINK))
rtnh->rtnh_flags |= RTNH_F_ONLINK;
if (rtmsg->rtm_family == AF_INET
&& (nexthop->type == NEXTHOP_TYPE_IPV6
|| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX)) {
bytelen = 4;
rtnh->rtnh_flags |= RTNH_F_ONLINK;
rta_addattr_l(rta, NL_PKT_BUF_SIZE, RTA_GATEWAY, &ipv4_ll,
bytelen);
rtnh->rtnh_len += sizeof(struct rtattr) + bytelen;
rtnh->rtnh_ifindex = nexthop->ifindex;
if (nexthop->rmap_src.ipv4.s_addr)
*src = &nexthop->rmap_src;
else if (nexthop->src.ipv4.s_addr)
*src = &nexthop->src;
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
" 5549: netlink_route_build_multipath() (%s): "
"nexthop via %s %s if %u",
routedesc, ipv4_ll_buf, label_buf,
nexthop->ifindex);
return;
}
if (nexthop->type == NEXTHOP_TYPE_IPV4
|| nexthop->type == NEXTHOP_TYPE_IPV4_IFINDEX) {
_netlink_route_rta_add_gateway_info(rtmsg->rtm_family, AF_INET,
rta, rtnh, NL_PKT_BUF_SIZE,
bytelen, nexthop);
if (nexthop->rmap_src.ipv4.s_addr)
*src = &nexthop->rmap_src;
else if (nexthop->src.ipv4.s_addr)
*src = &nexthop->src;
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"netlink_route_multipath() (%s): "
"nexthop via %s %s if %u",
routedesc, inet_ntoa(nexthop->gate.ipv4),
label_buf, nexthop->ifindex);
}
if (nexthop->type == NEXTHOP_TYPE_IPV6
|| nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) {
_netlink_route_rta_add_gateway_info(rtmsg->rtm_family, AF_INET6,
rta, rtnh, NL_PKT_BUF_SIZE,
bytelen, nexthop);
if (!IN6_IS_ADDR_UNSPECIFIED(&nexthop->rmap_src.ipv6))
*src = &nexthop->rmap_src;
else if (!IN6_IS_ADDR_UNSPECIFIED(&nexthop->src.ipv6))
*src = &nexthop->src;
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"netlink_route_multipath() (%s): "
"nexthop via %s %s if %u",
routedesc, inet6_ntoa(nexthop->gate.ipv6),
label_buf, nexthop->ifindex);
}
/*
* We have figured out the ifindex so we should always send it
* This is especially useful if we are doing route
* leaking.
*/
if (nexthop->type != NEXTHOP_TYPE_BLACKHOLE)
rtnh->rtnh_ifindex = nexthop->ifindex;
/* ifindex */
if (nexthop->type == NEXTHOP_TYPE_IFINDEX) {
if (nexthop->rmap_src.ipv4.s_addr)
*src = &nexthop->rmap_src;
else if (nexthop->src.ipv4.s_addr)
*src = &nexthop->src;
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"netlink_route_multipath() (%s): "
"nexthop via if %u",
routedesc, nexthop->ifindex);
}
}
static inline void _netlink_mpls_build_singlepath(const char *routedesc,
const zebra_nhlfe_t *nhlfe,
struct nlmsghdr *nlmsg,
struct rtmsg *rtmsg,
size_t req_size, int cmd)
{
int bytelen;
uint8_t family;
family = NHLFE_FAMILY(nhlfe);
bytelen = (family == AF_INET ? 4 : 16);
_netlink_route_build_singlepath(routedesc, bytelen, nhlfe->nexthop,
nlmsg, rtmsg, req_size, cmd);
}
static inline void
_netlink_mpls_build_multipath(const char *routedesc, const zebra_nhlfe_t *nhlfe,
struct rtattr *rta, struct rtnexthop *rtnh,
struct rtmsg *rtmsg, const union g_addr **src)
{
int bytelen;
uint8_t family;
family = NHLFE_FAMILY(nhlfe);
bytelen = (family == AF_INET ? 4 : 16);
_netlink_route_build_multipath(routedesc, bytelen, nhlfe->nexthop, rta,
rtnh, rtmsg, src);
}
/* Log debug information for netlink_route_multipath
* if debug logging is enabled.
*
* @param cmd: Netlink command which is to be processed
* @param p: Prefix for which the change is due
* @param family: Address family which the change concerns
* @param zvrf: The vrf we are in
* @param tableid: The table we are working on
*/
static void _netlink_route_debug(int cmd, const struct prefix *p,
int family, vrf_id_t vrfid,
uint32_t tableid)
{
if (IS_ZEBRA_DEBUG_KERNEL) {
char buf[PREFIX_STRLEN];
zlog_debug(
"netlink_route_multipath(): %s %s vrf %u(%u)",
nl_msg_type_to_str(cmd),
prefix2str(p, buf, sizeof(buf)),
vrfid, tableid);
}
}
static void _netlink_nexthop_debug(int cmd, uint32_t id)
{
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("netlink_nexthop(): %s, id=%u",
nl_msg_type_to_str(cmd), id);
}
static void _netlink_mpls_debug(int cmd, uint32_t label, const char *routedesc)
{
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("netlink_mpls_multipath() (%s): %s %u/20", routedesc,
nl_msg_type_to_str(cmd), label);
}
static int netlink_neigh_update(int cmd, int ifindex, uint32_t addr, char *lla,
int llalen, ns_id_t ns_id)
{
uint8_t protocol = RTPROT_ZEBRA;
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
struct zebra_ns *zns = zebra_ns_lookup(ns_id);
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST;
req.n.nlmsg_type = cmd; // RTM_NEWNEIGH or RTM_DELNEIGH
req.n.nlmsg_pid = zns->netlink_cmd.snl.nl_pid;
req.ndm.ndm_family = AF_INET;
req.ndm.ndm_state = NUD_PERMANENT;
req.ndm.ndm_ifindex = ifindex;
req.ndm.ndm_type = RTN_UNICAST;
addattr_l(&req.n, sizeof(req),
NDA_PROTOCOL, &protocol, sizeof(protocol));
addattr_l(&req.n, sizeof(req), NDA_DST, &addr, 4);
addattr_l(&req.n, sizeof(req), NDA_LLADDR, lla, llalen);
return netlink_talk(netlink_talk_filter, &req.n, &zns->netlink_cmd, zns,
0);
}
/*
* Routing table change via netlink interface, using a dataplane context object
*/
static int netlink_route_multipath(int cmd, struct zebra_dplane_ctx *ctx)
{
int bytelen;
struct nexthop *nexthop = NULL;
unsigned int nexthop_num;
int family;
const char *routedesc;
int setsrc = 0;
union g_addr src;
const struct prefix *p, *src_p;
uint32_t table_id;
struct {
struct nlmsghdr n;
struct rtmsg r;
char buf[NL_PKT_BUF_SIZE];
} req;
p = dplane_ctx_get_dest(ctx);
src_p = dplane_ctx_get_src(ctx);
family = PREFIX_FAMILY(p);
memset(&req, 0, sizeof(req) - NL_PKT_BUF_SIZE);
bytelen = (family == AF_INET ? 4 : 16);
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST;
if ((cmd == RTM_NEWROUTE) &&
((p->family == AF_INET) || v6_rr_semantics))
req.n.nlmsg_flags |= NLM_F_REPLACE;
req.n.nlmsg_type = cmd;
req.n.nlmsg_pid = dplane_ctx_get_ns(ctx)->nls.snl.nl_pid;
req.r.rtm_family = family;
req.r.rtm_dst_len = p->prefixlen;
req.r.rtm_src_len = src_p ? src_p->prefixlen : 0;
req.r.rtm_scope = RT_SCOPE_UNIVERSE;
if (cmd == RTM_DELROUTE)
req.r.rtm_protocol = zebra2proto(dplane_ctx_get_old_type(ctx));
else
req.r.rtm_protocol = zebra2proto(dplane_ctx_get_type(ctx));
/*
* blackhole routes are not RTN_UNICAST, they are
* RTN_ BLACKHOLE|UNREACHABLE|PROHIBIT
* so setting this value as a RTN_UNICAST would
* cause the route lookup of just the prefix
* to fail. So no need to specify this for
* the RTM_DELROUTE case
*/
if (cmd != RTM_DELROUTE)
req.r.rtm_type = RTN_UNICAST;
addattr_l(&req.n, sizeof(req), RTA_DST, &p->u.prefix, bytelen);
if (src_p)
addattr_l(&req.n, sizeof(req), RTA_SRC, &src_p->u.prefix,
bytelen);
/* Metric. */
/* Hardcode the metric for all routes coming from zebra. Metric isn't
* used
* either by the kernel or by zebra. Its purely for calculating best
* path(s)
* by the routing protocol and for communicating with protocol peers.
*/
addattr32(&req.n, sizeof(req), RTA_PRIORITY, NL_DEFAULT_ROUTE_METRIC);
#if defined(SUPPORT_REALMS)
{
route_tag_t tag;
if (cmd == RTM_DELROUTE)
tag = dplane_ctx_get_old_tag(ctx);
else
tag = dplane_ctx_get_tag(ctx);
if (tag > 0 && tag <= 255)
addattr32(&req.n, sizeof(req), RTA_FLOW, tag);
}
#endif
/* Table corresponding to this route. */
table_id = dplane_ctx_get_table(ctx);
if (table_id < 256)
req.r.rtm_table = table_id;
else {
req.r.rtm_table = RT_TABLE_UNSPEC;
addattr32(&req.n, sizeof(req), RTA_TABLE, table_id);
}
_netlink_route_debug(cmd, p, family, dplane_ctx_get_vrf(ctx), table_id);
/*
* If we are not updating the route and we have received
* a route delete, then all we need to fill in is the
* prefix information to tell the kernel to schwack
* it.
*/
if (cmd == RTM_DELROUTE)
goto skip;
if (dplane_ctx_get_mtu(ctx) || dplane_ctx_get_nh_mtu(ctx)) {
char buf[NL_PKT_BUF_SIZE];
struct rtattr *rta = (void *)buf;
uint32_t mtu = dplane_ctx_get_mtu(ctx);
uint32_t nexthop_mtu = dplane_ctx_get_nh_mtu(ctx);
if (!mtu || (nexthop_mtu && nexthop_mtu < mtu))
mtu = nexthop_mtu;
rta->rta_type = RTA_METRICS;
rta->rta_len = RTA_LENGTH(0);
rta_addattr_l(rta, NL_PKT_BUF_SIZE,
RTAX_MTU, &mtu, sizeof(mtu));
addattr_l(&req.n, NL_PKT_BUF_SIZE, RTA_METRICS, RTA_DATA(rta),
RTA_PAYLOAD(rta));
}
if (supports_nh) {
/* Kernel supports nexthop objects */
addattr32(&req.n, sizeof(req), RTA_NH_ID,
dplane_ctx_get_nhe_id(ctx));
goto skip;
}
/* Count overall nexthops so we can decide whether to use singlepath
* or multipath case.
*/
nexthop_num = 0;
for (ALL_NEXTHOPS_PTR(dplane_ctx_get_ng(ctx), nexthop)) {
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
continue;
if (cmd == RTM_NEWROUTE && !NEXTHOP_IS_ACTIVE(nexthop->flags))
continue;
nexthop_num++;
}
/* Singlepath case. */
if (nexthop_num == 1) {
nexthop_num = 0;
for (ALL_NEXTHOPS_PTR(dplane_ctx_get_ng(ctx), nexthop)) {
/*
* So we want to cover 2 types of blackhole
* routes here:
* 1) A normal blackhole route( ala from a static
* install.
* 2) A recursively resolved blackhole route
*/
if (nexthop->type == NEXTHOP_TYPE_BLACKHOLE) {
switch (nexthop->bh_type) {
case BLACKHOLE_ADMINPROHIB:
req.r.rtm_type = RTN_PROHIBIT;
break;
case BLACKHOLE_REJECT:
req.r.rtm_type = RTN_UNREACHABLE;
break;
default:
req.r.rtm_type = RTN_BLACKHOLE;
break;
}
goto skip;
}
if (CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_RECURSIVE)) {
if (setsrc)
continue;
if (family == AF_INET) {
if (nexthop->rmap_src.ipv4.s_addr
!= 0) {
src.ipv4 =
nexthop->rmap_src.ipv4;
setsrc = 1;
} else if (nexthop->src.ipv4.s_addr
!= 0) {
src.ipv4 =
nexthop->src.ipv4;
setsrc = 1;
}
} else if (family == AF_INET6) {
if (!IN6_IS_ADDR_UNSPECIFIED(
&nexthop->rmap_src.ipv6)) {
src.ipv6 =
nexthop->rmap_src.ipv6;
setsrc = 1;
} else if (
!IN6_IS_ADDR_UNSPECIFIED(
&nexthop->src.ipv6)) {
src.ipv6 =
nexthop->src.ipv6;
setsrc = 1;
}
}
continue;
}
if ((cmd == RTM_NEWROUTE
&& NEXTHOP_IS_ACTIVE(nexthop->flags))) {
routedesc = nexthop->rparent
? "recursive, single-path"
: "single-path";
_netlink_route_build_singlepath(
routedesc, bytelen, nexthop, &req.n,
&req.r, sizeof(req), cmd);
nexthop_num++;
break;
}
}
if (setsrc && (cmd == RTM_NEWROUTE)) {
if (family == AF_INET)
addattr_l(&req.n, sizeof(req), RTA_PREFSRC,
&src.ipv4, bytelen);
else if (family == AF_INET6)
addattr_l(&req.n, sizeof(req), RTA_PREFSRC,
&src.ipv6, bytelen);
}
} else { /* Multipath case */
char buf[NL_PKT_BUF_SIZE];
struct rtattr *rta = (void *)buf;
struct rtnexthop *rtnh;
const union g_addr *src1 = NULL;
rta->rta_type = RTA_MULTIPATH;
rta->rta_len = RTA_LENGTH(0);
rtnh = RTA_DATA(rta);
nexthop_num = 0;
for (ALL_NEXTHOPS_PTR(dplane_ctx_get_ng(ctx), nexthop)) {
if (CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_RECURSIVE)) {
/* This only works for IPv4 now */
if (setsrc)
continue;
if (family == AF_INET) {
if (nexthop->rmap_src.ipv4.s_addr
!= 0) {
src.ipv4 =
nexthop->rmap_src.ipv4;
setsrc = 1;
} else if (nexthop->src.ipv4.s_addr
!= 0) {
src.ipv4 =
nexthop->src.ipv4;
setsrc = 1;
}
} else if (family == AF_INET6) {
if (!IN6_IS_ADDR_UNSPECIFIED(
&nexthop->rmap_src.ipv6)) {
src.ipv6 =
nexthop->rmap_src.ipv6;
setsrc = 1;
} else if (
!IN6_IS_ADDR_UNSPECIFIED(
&nexthop->src.ipv6)) {
src.ipv6 =
nexthop->src.ipv6;
setsrc = 1;
}
}
continue;
}
if ((cmd == RTM_NEWROUTE
&& NEXTHOP_IS_ACTIVE(nexthop->flags))) {
routedesc = nexthop->rparent
? "recursive, multipath"
: "multipath";
nexthop_num++;
_netlink_route_build_multipath(
routedesc, bytelen, nexthop, rta, rtnh,
&req.r, &src1);
rtnh = RTNH_NEXT(rtnh);
if (!setsrc && src1) {
if (family == AF_INET)
src.ipv4 = src1->ipv4;
else if (family == AF_INET6)
src.ipv6 = src1->ipv6;
setsrc = 1;
}
}
}
if (setsrc && (cmd == RTM_NEWROUTE)) {
if (family == AF_INET)
addattr_l(&req.n, sizeof(req), RTA_PREFSRC,
&src.ipv4, bytelen);
else if (family == AF_INET6)
addattr_l(&req.n, sizeof(req), RTA_PREFSRC,
&src.ipv6, bytelen);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Setting source");
}
if (rta->rta_len > RTA_LENGTH(0))
addattr_l(&req.n, NL_PKT_BUF_SIZE, RTA_MULTIPATH,
RTA_DATA(rta), RTA_PAYLOAD(rta));
}
/* If there is no useful nexthop then return. */
if (nexthop_num == 0) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"netlink_route_multipath(): No useful nexthop.");
return 0;
}
skip:
/* Talk to netlink socket. */
return netlink_talk_info(netlink_talk_filter, &req.n,
dplane_ctx_get_ns(ctx), 0);
}
int kernel_get_ipmr_sg_stats(struct zebra_vrf *zvrf, void *in)
{
uint32_t actual_table;
int suc = 0;
struct mcast_route_data *mr = (struct mcast_route_data *)in;
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
mroute = mr;
struct zebra_ns *zns;
zns = zvrf->zns;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_pid = zns->netlink_cmd.snl.nl_pid;
req.ndm.ndm_family = RTNL_FAMILY_IPMR;
req.n.nlmsg_type = RTM_GETROUTE;
addattr_l(&req.n, sizeof(req), RTA_IIF, &mroute->ifindex, 4);
addattr_l(&req.n, sizeof(req), RTA_OIF, &mroute->ifindex, 4);
addattr_l(&req.n, sizeof(req), RTA_SRC, &mroute->sg.src.s_addr, 4);
addattr_l(&req.n, sizeof(req), RTA_DST, &mroute->sg.grp.s_addr, 4);
/*
* What?
*
* So during the namespace cleanup we started storing
* the zvrf table_id for the default table as RT_TABLE_MAIN
* which is what the normal routing table for ip routing is.
* This change caused this to break our lookups of sg data
* because prior to this change the zvrf->table_id was 0
* and when the pim multicast kernel code saw a 0,
* it was auto-translated to RT_TABLE_DEFAULT. But since
* we are now passing in RT_TABLE_MAIN there is no auto-translation
* and the kernel goes screw you and the delicious cookies you
* are trying to give me. So now we have this little hack.
*/
actual_table = (zvrf->table_id == RT_TABLE_MAIN) ? RT_TABLE_DEFAULT :
zvrf->table_id;
addattr_l(&req.n, sizeof(req), RTA_TABLE, &actual_table, 4);
suc = netlink_talk(netlink_route_change_read_multicast, &req.n,
&zns->netlink_cmd, zns, 0);
mroute = NULL;
return suc;
}
/* Char length to debug ID with */
#define ID_LENGTH 10
static void _netlink_nexthop_build_group(struct nlmsghdr *n, size_t req_size,
uint32_t id,
const struct nh_grp *z_grp,
const uint8_t count)
{
struct nexthop_grp grp[count];
/* Need space for max group size, "/", and null term */
char buf[(MULTIPATH_NUM * (ID_LENGTH + 1)) + 1];
char buf1[ID_LENGTH + 2];
buf[0] = '\0';
memset(grp, 0, sizeof(grp));
if (count) {
for (int i = 0; i < count; i++) {
grp[i].id = z_grp[i].id;
grp[i].weight = z_grp[i].weight;
if (IS_ZEBRA_DEBUG_KERNEL) {
if (i == 0)
snprintf(buf, sizeof(buf1), "group %u",
grp[i].id);
else {
snprintf(buf1, sizeof(buf1), "/%u",
grp[i].id);
strlcat(buf, buf1, sizeof(buf));
}
}
}
addattr_l(n, req_size, NHA_GROUP, grp, count * sizeof(*grp));
}
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: ID (%u): %s", __func__, id, buf);
}
/**
* netlink_nexthop() - Nexthop change via the netlink interface
*
* @ctx: Dataplane ctx
*
* Return: Result status
*/
static int netlink_nexthop(int cmd, struct zebra_dplane_ctx *ctx)
{
struct {
struct nlmsghdr n;
struct nhmsg nhm;
char buf[NL_PKT_BUF_SIZE];
} req;
mpls_lse_t out_lse[MPLS_MAX_LABELS];
char label_buf[256];
int num_labels = 0;
size_t req_size = sizeof(req);
/* Nothing to do if the kernel doesn't support nexthop objects */
if (!supports_nh)
return 0;
label_buf[0] = '\0';
memset(&req, 0, req_size);
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct nhmsg));
req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST;
if (cmd == RTM_NEWNEXTHOP)
req.n.nlmsg_flags |= NLM_F_REPLACE;
req.n.nlmsg_type = cmd;
req.n.nlmsg_pid = dplane_ctx_get_ns(ctx)->nls.snl.nl_pid;
req.nhm.nh_family = AF_UNSPEC;
/* TODO: Scope? */
uint32_t id = dplane_ctx_get_nhe_id(ctx);
if (!id) {
flog_err(
EC_ZEBRA_NHG_FIB_UPDATE,
"Failed trying to update a nexthop group in the kernel that does not have an ID");
return -1;
}
addattr32(&req.n, req_size, NHA_ID, id);
if (cmd == RTM_NEWNEXTHOP) {
if (dplane_ctx_get_nhe_nh_grp_count(ctx))
_netlink_nexthop_build_group(
&req.n, req_size, id,
dplane_ctx_get_nhe_nh_grp(ctx),
dplane_ctx_get_nhe_nh_grp_count(ctx));
else {
const struct nexthop *nh =
dplane_ctx_get_nhe_ng(ctx)->nexthop;
afi_t afi = dplane_ctx_get_nhe_afi(ctx);
if (afi == AFI_IP)
req.nhm.nh_family = AF_INET;
else if (afi == AFI_IP6)
req.nhm.nh_family = AF_INET6;
switch (nh->type) {
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
addattr_l(&req.n, req_size, NHA_GATEWAY,
&nh->gate.ipv4, IPV4_MAX_BYTELEN);
break;
case NEXTHOP_TYPE_IPV6:
case NEXTHOP_TYPE_IPV6_IFINDEX:
addattr_l(&req.n, req_size, NHA_GATEWAY,
&nh->gate.ipv6, IPV6_MAX_BYTELEN);
break;
case NEXTHOP_TYPE_BLACKHOLE:
addattr_l(&req.n, req_size, NHA_BLACKHOLE, NULL,
0);
/* Blackhole shouldn't have anymore attributes
*/
goto nexthop_done;
case NEXTHOP_TYPE_IFINDEX:
/* Don't need anymore info for this */
break;
}
if (!nh->ifindex) {
flog_err(
EC_ZEBRA_NHG_FIB_UPDATE,
"Context received for kernel nexthop update without an interface");
return -1;
}
addattr32(&req.n, req_size, NHA_OIF, nh->ifindex);
num_labels =
build_label_stack(nh->nh_label, out_lse,
label_buf, sizeof(label_buf));
if (num_labels) {
/* Set the BoS bit */
out_lse[num_labels - 1] |=
htonl(1 << MPLS_LS_S_SHIFT);
/*
* TODO: MPLS unsupported for now in kernel.
*/
if (req.nhm.nh_family == AF_MPLS)
goto nexthop_done;
#if 0
addattr_l(&req.n, req_size, NHA_NEWDST,
&out_lse,
num_labels
* sizeof(mpls_lse_t));
#endif
else {
struct rtattr *nest;
uint16_t encap = LWTUNNEL_ENCAP_MPLS;
addattr_l(&req.n, req_size,
NHA_ENCAP_TYPE, &encap,
sizeof(uint16_t));
nest = addattr_nest(&req.n, req_size,
NHA_ENCAP);
addattr_l(&req.n, req_size,
MPLS_IPTUNNEL_DST, &out_lse,
num_labels
* sizeof(mpls_lse_t));
addattr_nest_end(&req.n, nest);
}
}
nexthop_done:
if (IS_ZEBRA_DEBUG_KERNEL) {
char buf[NEXTHOP_STRLEN];
snprintfrr(buf, sizeof(buf), "%pNHv", nh);
zlog_debug("%s: ID (%u): %s (%u) %s ", __func__,
id, buf, nh->vrf_id, label_buf);
}
}
req.nhm.nh_protocol = zebra2proto(dplane_ctx_get_nhe_type(ctx));
} else if (cmd != RTM_DELNEXTHOP) {
flog_err(
EC_ZEBRA_NHG_FIB_UPDATE,
"Nexthop group kernel update command (%d) does not exist",
cmd);
return -1;
}
_netlink_nexthop_debug(cmd, id);
return netlink_talk_info(netlink_talk_filter, &req.n,
dplane_ctx_get_ns(ctx), 0);
}
/**
* kernel_nexthop_update() - Update/delete a nexthop from the kernel
*
* @ctx: Dataplane context
*
* Return: Dataplane result flag
*/
enum zebra_dplane_result kernel_nexthop_update(struct zebra_dplane_ctx *ctx)
{
int cmd = 0;
int ret = 0;
switch (dplane_ctx_get_op(ctx)) {
case DPLANE_OP_NH_DELETE:
cmd = RTM_DELNEXTHOP;
break;
case DPLANE_OP_NH_INSTALL:
case DPLANE_OP_NH_UPDATE:
cmd = RTM_NEWNEXTHOP;
break;
case DPLANE_OP_ROUTE_INSTALL:
case DPLANE_OP_ROUTE_UPDATE:
case DPLANE_OP_ROUTE_DELETE:
case DPLANE_OP_ROUTE_NOTIFY:
case DPLANE_OP_LSP_INSTALL:
case DPLANE_OP_LSP_UPDATE:
case DPLANE_OP_LSP_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_NONE:
flog_err(
EC_ZEBRA_NHG_FIB_UPDATE,
"Context received for kernel nexthop update with incorrect OP code (%u)",
dplane_ctx_get_op(ctx));
return ZEBRA_DPLANE_REQUEST_FAILURE;
}
ret = netlink_nexthop(cmd, ctx);
return (ret == 0 ? ZEBRA_DPLANE_REQUEST_SUCCESS
: ZEBRA_DPLANE_REQUEST_FAILURE);
}
/*
* Update or delete a prefix from the kernel,
* using info from a dataplane context.
*/
enum zebra_dplane_result kernel_route_update(struct zebra_dplane_ctx *ctx)
{
int cmd, ret;
const struct prefix *p = dplane_ctx_get_dest(ctx);
struct nexthop *nexthop;
if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_DELETE) {
cmd = RTM_DELROUTE;
} else if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_INSTALL) {
cmd = RTM_NEWROUTE;
} else if (dplane_ctx_get_op(ctx) == DPLANE_OP_ROUTE_UPDATE) {
if (p->family == AF_INET || v6_rr_semantics) {
/* Single 'replace' operation */
cmd = RTM_NEWROUTE;
/*
* With route replace semantics in place
* for v4 routes and the new route is a system
* route we do not install anything.
* The problem here is that the new system
* route should cause us to withdraw from
* the kernel the old non-system route
*/
if (RSYSTEM_ROUTE(dplane_ctx_get_type(ctx)) &&
!RSYSTEM_ROUTE(dplane_ctx_get_old_type(ctx)))
(void)netlink_route_multipath(RTM_DELROUTE,
ctx);
} else {
/*
* So v6 route replace semantics are not in
* the kernel at this point as I understand it.
* so let's do a delete then an add.
* In the future once v6 route replace semantics
* are in we can figure out what to do here to
* allow working with old and new kernels.
*
* I'm also intentionally ignoring the failure case
* of the route delete. If that happens yeah we're
* screwed.
*/
if (!RSYSTEM_ROUTE(dplane_ctx_get_old_type(ctx)))
(void)netlink_route_multipath(RTM_DELROUTE,
ctx);
cmd = RTM_NEWROUTE;
}
} else {
return ZEBRA_DPLANE_REQUEST_FAILURE;
}
if (!RSYSTEM_ROUTE(dplane_ctx_get_type(ctx)))
ret = netlink_route_multipath(cmd, ctx);
else
ret = 0;
if ((cmd == RTM_NEWROUTE) && (ret == 0)) {
/* Update installed nexthops to signal which have been
* installed.
*/
for (ALL_NEXTHOPS_PTR(dplane_ctx_get_ng(ctx), nexthop)) {
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
continue;
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE)) {
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB);
}
}
}
return (ret == 0 ?
ZEBRA_DPLANE_REQUEST_SUCCESS : ZEBRA_DPLANE_REQUEST_FAILURE);
}
/**
* netlink_nexthop_process_nh() - Parse the gatway/if info from a new nexthop
*
* @tb: Netlink RTA data
* @family: Address family in the nhmsg
* @ifp: Interface connected - this should be NULL, we fill it in
* @ns_id: Namspace id
*
* Return: New nexthop
*/
static struct nexthop netlink_nexthop_process_nh(struct rtattr **tb,
unsigned char family,
struct interface **ifp,
ns_id_t ns_id)
{
struct nexthop nh = {};
void *gate = NULL;
enum nexthop_types_t type = 0;
int if_index = 0;
size_t sz = 0;
if_index = *(int *)RTA_DATA(tb[NHA_OIF]);
if (tb[NHA_GATEWAY]) {
switch (family) {
case AF_INET:
type = NEXTHOP_TYPE_IPV4_IFINDEX;
sz = 4;
break;
case AF_INET6:
type = NEXTHOP_TYPE_IPV6_IFINDEX;
sz = 16;
break;
default:
flog_warn(
EC_ZEBRA_BAD_NHG_MESSAGE,
"Nexthop gateway with bad address family (%d) received from kernel",
family);
return nh;
}
gate = RTA_DATA(tb[NHA_GATEWAY]);
} else
type = NEXTHOP_TYPE_IFINDEX;
if (type)
nh.type = type;
if (gate)
memcpy(&(nh.gate), gate, sz);
if (if_index)
nh.ifindex = if_index;
*ifp = if_lookup_by_index_per_ns(zebra_ns_lookup(ns_id), nh.ifindex);
if (ifp)
nh.vrf_id = (*ifp)->vrf_id;
else {
flog_warn(
EC_ZEBRA_UNKNOWN_INTERFACE,
"%s: Unknown nexthop interface %u received, defaulting to VRF_DEFAULT",
__PRETTY_FUNCTION__, nh.ifindex);
nh.vrf_id = VRF_DEFAULT;
}
if (tb[NHA_ENCAP] && tb[NHA_ENCAP_TYPE]) {
uint16_t encap_type = *(uint16_t *)RTA_DATA(tb[NHA_ENCAP_TYPE]);
int num_labels = 0;
mpls_label_t labels[MPLS_MAX_LABELS] = {0};
if (encap_type == LWTUNNEL_ENCAP_MPLS)
num_labels = parse_encap_mpls(tb[NHA_ENCAP], labels);
if (num_labels)
nexthop_add_labels(&nh, ZEBRA_LSP_STATIC, num_labels,
labels);
}
return nh;
}
static int netlink_nexthop_process_group(struct rtattr **tb,
struct nh_grp *z_grp, int z_grp_size)
{
uint8_t count = 0;
/* linux/nexthop.h group struct */
struct nexthop_grp *n_grp = NULL;
n_grp = (struct nexthop_grp *)RTA_DATA(tb[NHA_GROUP]);
count = (RTA_PAYLOAD(tb[NHA_GROUP]) / sizeof(*n_grp));
if (!count || (count * sizeof(*n_grp)) != RTA_PAYLOAD(tb[NHA_GROUP])) {
flog_warn(EC_ZEBRA_BAD_NHG_MESSAGE,
"Invalid nexthop group received from the kernel");
return count;
}
#if 0
// TODO: Need type for something?
zlog_debug("Nexthop group type: %d",
*((uint16_t *)RTA_DATA(tb[NHA_GROUP_TYPE])));
#endif
for (int i = 0; ((i < count) && (i < z_grp_size)); i++) {
z_grp[i].id = n_grp[i].id;
z_grp[i].weight = n_grp[i].weight;
}
return count;
}
/**
* netlink_nexthop_change() - Read in change about nexthops from the kernel
*
* @h: Netlink message header
* @ns_id: Namspace id
* @startup: Are we reading under startup conditions?
*
* Return: Result status
*/
int netlink_nexthop_change(struct nlmsghdr *h, ns_id_t ns_id, int startup)
{
int len;
/* nexthop group id */
uint32_t id;
unsigned char family;
int type;
afi_t afi = AFI_UNSPEC;
vrf_id_t vrf_id = 0;
struct interface *ifp = NULL;
struct nhmsg *nhm = NULL;
struct nexthop nh = {};
struct nh_grp grp[MULTIPATH_NUM] = {};
/* Count of nexthops in group array */
uint8_t grp_count = 0;
struct rtattr *tb[NHA_MAX + 1] = {};
nhm = NLMSG_DATA(h);
if (startup && h->nlmsg_type != RTM_NEWNEXTHOP)
return 0;
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct nhmsg));
if (len < 0) {
zlog_warn(
"%s: Message received from netlink is of a broken size %d %zu",
__PRETTY_FUNCTION__, h->nlmsg_len,
(size_t)NLMSG_LENGTH(sizeof(struct nhmsg)));
return -1;
}
netlink_parse_rtattr(tb, NHA_MAX, RTM_NHA(nhm), len);
if (!tb[NHA_ID]) {
flog_warn(
EC_ZEBRA_BAD_NHG_MESSAGE,
"Nexthop group without an ID received from the kernel");
return -1;
}
/* We use the ID key'd nhg table for kernel updates */
id = *((uint32_t *)RTA_DATA(tb[NHA_ID]));
family = nhm->nh_family;
afi = family2afi(family);
type = proto2zebra(nhm->nh_protocol, 0, true);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s ID (%u) %s NS %u",
nl_msg_type_to_str(h->nlmsg_type), id,
nl_family_to_str(family), ns_id);
if (h->nlmsg_type == RTM_NEWNEXTHOP) {
if (tb[NHA_GROUP]) {
/**
* If this is a group message its only going to have
* an array of nexthop IDs associated with it
*/
grp_count = netlink_nexthop_process_group(
tb, grp, array_size(grp));
} else {
if (tb[NHA_BLACKHOLE]) {
/**
* This nexthop is just for blackhole-ing
* traffic, it should not have an OIF, GATEWAY,
* or ENCAP
*/
nh.type = NEXTHOP_TYPE_BLACKHOLE;
nh.bh_type = BLACKHOLE_UNSPEC;
} else if (tb[NHA_OIF])
/**
* This is a true new nexthop, so we need
* to parse the gateway and device info
*/
nh = netlink_nexthop_process_nh(tb, family,
&ifp, ns_id);
else {
flog_warn(
EC_ZEBRA_BAD_NHG_MESSAGE,
"Invalid Nexthop message received from the kernel with ID (%u)",
id);
return -1;
}
SET_FLAG(nh.flags, NEXTHOP_FLAG_ACTIVE);
if (nhm->nh_flags & RTNH_F_ONLINK)
SET_FLAG(nh.flags, NEXTHOP_FLAG_ONLINK);
vrf_id = nh.vrf_id;
}
if (zebra_nhg_kernel_find(id, &nh, grp, grp_count, vrf_id, afi,
type, startup))
return -1;
} else if (h->nlmsg_type == RTM_DELNEXTHOP)
zebra_nhg_kernel_del(id);
return 0;
}
#if 0 /* Force off kernel nexthop group installs for now */
/**
* netlink_request_nexthop() - Request nextop information from the kernel
* @zns: Zebra namespace
* @family: AF_* netlink family
* @type: RTM_* route type
*
* Return: Result status
*/
static int netlink_request_nexthop(struct zebra_ns *zns, int family, int type)
{
struct {
struct nlmsghdr n;
struct nhmsg nhm;
} req;
/* Form the request, specifying filter (rtattr) if needed. */
memset(&req, 0, sizeof(req));
req.n.nlmsg_type = type;
req.n.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct nhmsg));
req.nhm.nh_family = family;
return netlink_request(&zns->netlink_cmd, &req.n);
}
/**
* netlink_nexthop_read() - Nexthop read function using netlink interface
*
* @zns: Zebra name space
*
* Return: Result status
* Only called at bootstrap time.
*/
int netlink_nexthop_read(struct zebra_ns *zns)
{
int ret;
struct zebra_dplane_info dp_info;
zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
/* Get nexthop objects */
ret = netlink_request_nexthop(zns, AF_UNSPEC, RTM_GETNEXTHOP);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_nexthop_change, &zns->netlink_cmd,
&dp_info, 0, 1);
if (!ret)
/* If we succesfully read in nexthop objects,
* this kernel must support them.
*/
supports_nh = true;
else if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Nexthop objects not supported on this kernel");
return ret;
}
#else
int netlink_nexthop_read(struct zebra_ns *zns)
{
return 0;
}
#endif
int kernel_neigh_update(int add, int ifindex, uint32_t addr, char *lla,
int llalen, ns_id_t ns_id)
{
return netlink_neigh_update(add ? RTM_NEWNEIGH : RTM_DELNEIGH, ifindex,
addr, lla, llalen, ns_id);
}
/*
* Add remote VTEP to the flood list for this VxLAN interface (VNI). This
* is done by adding an FDB entry with a MAC of 00:00:00:00:00:00.
*/
static int netlink_vxlan_flood_update_ctx(const struct zebra_dplane_ctx *ctx,
int cmd)
{
uint8_t protocol = RTPROT_ZEBRA;
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
uint8_t dst_mac[6] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0};
const struct ipaddr *addr;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.n.nlmsg_flags = NLM_F_REQUEST;
if (cmd == RTM_NEWNEIGH)
req.n.nlmsg_flags |= (NLM_F_CREATE | NLM_F_APPEND);
req.n.nlmsg_type = cmd;
req.ndm.ndm_family = PF_BRIDGE;
req.ndm.ndm_state = NUD_NOARP | NUD_PERMANENT;
req.ndm.ndm_flags |= NTF_SELF; /* Handle by "self", not "master" */
addattr_l(&req.n, sizeof(req),
NDA_PROTOCOL, &protocol, sizeof(protocol));
addattr_l(&req.n, sizeof(req), NDA_LLADDR, &dst_mac, 6);
req.ndm.ndm_ifindex = dplane_ctx_get_ifindex(ctx);
addr = dplane_ctx_neigh_get_ipaddr(ctx);
addattr_l(&req.n, sizeof(req), NDA_DST, &(addr->ipaddr_v4), 4);
return netlink_talk_info(netlink_talk_filter, &req.n,
dplane_ctx_get_ns(ctx), 0);
}
#ifndef NDA_RTA
#define NDA_RTA(r) \
((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
#endif
static int netlink_macfdb_change(struct nlmsghdr *h, int len, ns_id_t ns_id)
{
struct ndmsg *ndm;
struct interface *ifp;
struct zebra_if *zif;
struct rtattr *tb[NDA_MAX + 1];
struct interface *br_if;
struct ethaddr mac;
vlanid_t vid = 0;
struct prefix vtep_ip;
int vid_present = 0, dst_present = 0;
char buf[ETHER_ADDR_STRLEN];
char vid_buf[20];
char dst_buf[30];
bool sticky;
ndm = NLMSG_DATA(h);
/* We only process macfdb notifications if EVPN is enabled */
if (!is_evpn_enabled())
return 0;
/* The interface should exist. */
ifp = if_lookup_by_index_per_ns(zebra_ns_lookup(ns_id),
ndm->ndm_ifindex);
if (!ifp || !ifp->info) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("\t%s without associated interface: %u",
__PRETTY_FUNCTION__, ndm->ndm_ifindex);
return 0;
}
/* The interface should be something we're interested in. */
if (!IS_ZEBRA_IF_BRIDGE_SLAVE(ifp)) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("\t%s Not interested in %s, not a slave",
__PRETTY_FUNCTION__, ifp->name);
return 0;
}
/* Drop "permanent" entries. */
if (ndm->ndm_state & NUD_PERMANENT) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("\t%s Entry is PERMANENT, dropping",
__PRETTY_FUNCTION__);
return 0;
}
zif = (struct zebra_if *)ifp->info;
if ((br_if = zif->brslave_info.br_if) == NULL) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"%s family %s IF %s(%u) brIF %u - no bridge master",
nl_msg_type_to_str(h->nlmsg_type),
nl_family_to_str(ndm->ndm_family), ifp->name,
ndm->ndm_ifindex,
zif->brslave_info.bridge_ifindex);
return 0;
}
/* Parse attributes and extract fields of interest. */
memset(tb, 0, sizeof tb);
netlink_parse_rtattr(tb, NDA_MAX, NDA_RTA(ndm), len);
if (!tb[NDA_LLADDR]) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s family %s IF %s(%u) brIF %u - no LLADDR",
nl_msg_type_to_str(h->nlmsg_type),
nl_family_to_str(ndm->ndm_family), ifp->name,
ndm->ndm_ifindex,
zif->brslave_info.bridge_ifindex);
return 0;
}
if (RTA_PAYLOAD(tb[NDA_LLADDR]) != ETH_ALEN) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"%s family %s IF %s(%u) brIF %u - LLADDR is not MAC, len %lu",
nl_msg_type_to_str(h->nlmsg_type),
nl_family_to_str(ndm->ndm_family), ifp->name,
ndm->ndm_ifindex,
zif->brslave_info.bridge_ifindex,
(unsigned long)RTA_PAYLOAD(tb[NDA_LLADDR]));
return 0;
}
memcpy(&mac, RTA_DATA(tb[NDA_LLADDR]), ETH_ALEN);
if ((NDA_VLAN <= NDA_MAX) && tb[NDA_VLAN]) {
vid_present = 1;
vid = *(uint16_t *)RTA_DATA(tb[NDA_VLAN]);
sprintf(vid_buf, " VLAN %u", vid);
}
if (tb[NDA_DST]) {
/* TODO: Only IPv4 supported now. */
dst_present = 1;
vtep_ip.family = AF_INET;
vtep_ip.prefixlen = IPV4_MAX_BITLEN;
memcpy(&(vtep_ip.u.prefix4.s_addr), RTA_DATA(tb[NDA_DST]),
IPV4_MAX_BYTELEN);
sprintf(dst_buf, " dst %s", inet_ntoa(vtep_ip.u.prefix4));
}
sticky = !!(ndm->ndm_state & NUD_NOARP);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Rx %s family %s IF %s(%u)%s %sMAC %s%s",
nl_msg_type_to_str(h->nlmsg_type),
nl_family_to_str(ndm->ndm_family), ifp->name,
ndm->ndm_ifindex, vid_present ? vid_buf : "",
sticky ? "sticky " : "",
prefix_mac2str(&mac, buf, sizeof(buf)),
dst_present ? dst_buf : "");
if (filter_vlan && vid != filter_vlan) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("\tFiltered due to filter vlan: %d",
filter_vlan);
return 0;
}
/* If add or update, do accordingly if learnt on a "local" interface; if
* the notification is over VxLAN, this has to be related to
* multi-homing,
* so perform an implicit delete of any local entry (if it exists).
*/
if (h->nlmsg_type == RTM_NEWNEIGH) {
if (IS_ZEBRA_IF_VXLAN(ifp))
return zebra_vxlan_check_del_local_mac(ifp, br_if, &mac,
vid);
return zebra_vxlan_local_mac_add_update(ifp, br_if, &mac, vid,
sticky);
}
/* This is a delete notification.
* 1. For a MAC over VxLan, check if it needs to be refreshed(readded)
* 2. For a MAC over "local" interface, delete the mac
* Note: We will get notifications from both bridge driver and VxLAN
* driver.
* Ignore the notification from VxLan driver as it is also generated
* when mac moves from remote to local.
*/
if (dst_present) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("\tNo Destination Present");
return 0;
}
if (IS_ZEBRA_IF_VXLAN(ifp))
return zebra_vxlan_check_readd_remote_mac(ifp, br_if, &mac,
vid);
return zebra_vxlan_local_mac_del(ifp, br_if, &mac, vid);
}
static int netlink_macfdb_table(struct nlmsghdr *h, ns_id_t ns_id, int startup)
{
int len;
struct ndmsg *ndm;
if (h->nlmsg_type != RTM_NEWNEIGH)
return 0;
/* Length validity. */
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct ndmsg));
if (len < 0)
return -1;
/* We are interested only in AF_BRIDGE notifications. */
ndm = NLMSG_DATA(h);
if (ndm->ndm_family != AF_BRIDGE)
return 0;
return netlink_macfdb_change(h, len, ns_id);
}
/* Request for MAC FDB information from the kernel */
static int netlink_request_macs(struct nlsock *netlink_cmd, int family,
int type, ifindex_t master_ifindex)
{
struct {
struct nlmsghdr n;
struct ifinfomsg ifm;
char buf[256];
} req;
/* Form the request, specifying filter (rtattr) if needed. */
memset(&req, 0, sizeof(req));
req.n.nlmsg_type = type;
req.n.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.ifm.ifi_family = family;
if (master_ifindex)
addattr32(&req.n, sizeof(req), IFLA_MASTER, master_ifindex);
return netlink_request(netlink_cmd, &req.n);
}
/*
* MAC forwarding database read using netlink interface. This is invoked
* at startup.
*/
int netlink_macfdb_read(struct zebra_ns *zns)
{
int ret;
struct zebra_dplane_info dp_info;
zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
/* Get bridge FDB table. */
ret = netlink_request_macs(&zns->netlink_cmd, AF_BRIDGE, RTM_GETNEIGH,
0);
if (ret < 0)
return ret;
/* We are reading entire table. */
filter_vlan = 0;
ret = netlink_parse_info(netlink_macfdb_table, &zns->netlink_cmd,
&dp_info, 0, 1);
return ret;
}
/*
* MAC forwarding database read using netlink interface. This is for a
* specific bridge and matching specific access VLAN (if VLAN-aware bridge).
*/
int netlink_macfdb_read_for_bridge(struct zebra_ns *zns, struct interface *ifp,
struct interface *br_if)
{
struct zebra_if *br_zif;
struct zebra_if *zif;
struct zebra_l2info_vxlan *vxl;
struct zebra_dplane_info dp_info;
int ret = 0;
zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
/* Save VLAN we're filtering on, if needed. */
br_zif = (struct zebra_if *)br_if->info;
zif = (struct zebra_if *)ifp->info;
vxl = &zif->l2info.vxl;
if (IS_ZEBRA_IF_BRIDGE_VLAN_AWARE(br_zif))
filter_vlan = vxl->access_vlan;
/* Get bridge FDB table for specific bridge - we do the VLAN filtering.
*/
ret = netlink_request_macs(&zns->netlink_cmd, AF_BRIDGE, RTM_GETNEIGH,
br_if->ifindex);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_macfdb_table, &zns->netlink_cmd,
&dp_info, 0, 0);
/* Reset VLAN filter. */
filter_vlan = 0;
return ret;
}
/* Request for MAC FDB for a specific MAC address in VLAN from the kernel */
static int netlink_request_specific_mac_in_bridge(struct zebra_ns *zns,
int family,
int type,
struct interface *br_if,
struct ethaddr *mac,
vlanid_t vid)
{
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
struct zebra_if *br_zif;
char buf[ETHER_ADDR_STRLEN];
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.n.nlmsg_type = type; /* RTM_GETNEIGH */
req.n.nlmsg_flags = NLM_F_REQUEST;
req.ndm.ndm_family = family; /* AF_BRIDGE */
/* req.ndm.ndm_state = NUD_REACHABLE; */
addattr_l(&req.n, sizeof(req), NDA_LLADDR, mac, 6);
br_zif = (struct zebra_if *)br_if->info;
if (IS_ZEBRA_IF_BRIDGE_VLAN_AWARE(br_zif) && vid > 0)
addattr16(&req.n, sizeof(req), NDA_VLAN, vid);
addattr32(&req.n, sizeof(req), NDA_MASTER, br_if->ifindex);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: Tx family %s IF %s(%u) MAC %s vid %u",
__PRETTY_FUNCTION__,
nl_family_to_str(req.ndm.ndm_family), br_if->name,
br_if->ifindex,
prefix_mac2str(mac, buf, sizeof(buf)), vid);
return netlink_request(&zns->netlink_cmd, &req.n);
}
int netlink_macfdb_read_specific_mac(struct zebra_ns *zns,
struct interface *br_if,
struct ethaddr *mac, vlanid_t vid)
{
int ret = 0;
struct zebra_dplane_info dp_info;
zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
/* Get bridge FDB table for specific bridge - we do the VLAN filtering.
*/
ret = netlink_request_specific_mac_in_bridge(zns, AF_BRIDGE,
RTM_GETNEIGH,
br_if, mac, vid);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_macfdb_table, &zns->netlink_cmd,
&dp_info, 1, 0);
return ret;
}
/*
* Netlink-specific handler for MAC updates using dataplane context object.
*/
static enum zebra_dplane_result
netlink_macfdb_update_ctx(struct zebra_dplane_ctx *ctx)
{
uint8_t protocol = RTPROT_ZEBRA;
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
int ret;
int dst_alen;
int vid_present = 0;
int cmd;
struct in_addr vtep_ip;
vlanid_t vid;
if (dplane_ctx_get_op(ctx) == DPLANE_OP_MAC_INSTALL)
cmd = RTM_NEWNEIGH;
else
cmd = RTM_DELNEIGH;
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.n.nlmsg_flags = NLM_F_REQUEST;
if (cmd == RTM_NEWNEIGH)
req.n.nlmsg_flags |= (NLM_F_CREATE | NLM_F_REPLACE);
req.n.nlmsg_type = cmd;
req.ndm.ndm_family = AF_BRIDGE;
req.ndm.ndm_flags |= NTF_SELF | NTF_MASTER;
req.ndm.ndm_state = NUD_REACHABLE;
if (dplane_ctx_mac_is_sticky(ctx))
req.ndm.ndm_state |= NUD_NOARP;
else
req.ndm.ndm_flags |= NTF_EXT_LEARNED;
addattr_l(&req.n, sizeof(req),
NDA_PROTOCOL, &protocol, sizeof(protocol));
addattr_l(&req.n, sizeof(req), NDA_LLADDR,
dplane_ctx_mac_get_addr(ctx), 6);
req.ndm.ndm_ifindex = dplane_ctx_get_ifindex(ctx);
dst_alen = 4; // TODO: hardcoded
vtep_ip = *(dplane_ctx_mac_get_vtep_ip(ctx));
addattr_l(&req.n, sizeof(req), NDA_DST, &vtep_ip, dst_alen);
vid = dplane_ctx_mac_get_vlan(ctx);
if (vid > 0) {
addattr16(&req.n, sizeof(req), NDA_VLAN, vid);
vid_present = 1;
}
addattr32(&req.n, sizeof(req), NDA_MASTER,
dplane_ctx_mac_get_br_ifindex(ctx));
if (IS_ZEBRA_DEBUG_KERNEL) {
char ipbuf[PREFIX_STRLEN];
char buf[ETHER_ADDR_STRLEN];
char dst_buf[PREFIX_STRLEN + 10];
char vid_buf[20];
if (vid_present)
snprintf(vid_buf, sizeof(vid_buf), " VLAN %u", vid);
else
vid_buf[0] = '\0';
inet_ntop(AF_INET, &vtep_ip, ipbuf, sizeof(ipbuf));
snprintf(dst_buf, sizeof(dst_buf), " dst %s", ipbuf);
prefix_mac2str(dplane_ctx_mac_get_addr(ctx), buf, sizeof(buf));
zlog_debug("Tx %s family %s IF %s(%u)%s %sMAC %s%s",
nl_msg_type_to_str(cmd),
nl_family_to_str(req.ndm.ndm_family),
dplane_ctx_get_ifname(ctx),
dplane_ctx_get_ifindex(ctx), vid_buf,
dplane_ctx_mac_is_sticky(ctx) ? "sticky " : "",
buf, dst_buf);
}
ret = netlink_talk_info(netlink_talk_filter, &req.n,
dplane_ctx_get_ns(ctx), 0);
if (ret == 0)
return ZEBRA_DPLANE_REQUEST_SUCCESS;
else
return ZEBRA_DPLANE_REQUEST_FAILURE;
}
/*
* In the event the kernel deletes ipv4 link-local neighbor entries created for
* 5549 support, re-install them.
*/
static void netlink_handle_5549(struct ndmsg *ndm, struct zebra_if *zif,
struct interface *ifp, struct ipaddr *ip,
bool handle_failed)
{
if (ndm->ndm_family != AF_INET)
return;
if (!zif->v6_2_v4_ll_neigh_entry)
return;
if (ipv4_ll.s_addr != ip->ip._v4_addr.s_addr)
return;
if (handle_failed && ndm->ndm_state & NUD_FAILED) {
zlog_info("Neighbor Entry for %s has entered a failed state, not reinstalling",
ifp->name);
return;
}
if_nbr_ipv6ll_to_ipv4ll_neigh_update(ifp, &zif->v6_2_v4_ll_addr6, true);
}
#define NUD_VALID \
(NUD_PERMANENT | NUD_NOARP | NUD_REACHABLE | NUD_PROBE | NUD_STALE \
| NUD_DELAY)
static int netlink_ipneigh_change(struct nlmsghdr *h, int len, ns_id_t ns_id)
{
struct ndmsg *ndm;
struct interface *ifp;
struct zebra_if *zif;
struct rtattr *tb[NDA_MAX + 1];
struct interface *link_if;
struct ethaddr mac;
struct ipaddr ip;
char buf[ETHER_ADDR_STRLEN];
char buf2[INET6_ADDRSTRLEN];
int mac_present = 0;
bool is_ext;
bool is_router;
ndm = NLMSG_DATA(h);
/* The interface should exist. */
ifp = if_lookup_by_index_per_ns(zebra_ns_lookup(ns_id),
ndm->ndm_ifindex);
if (!ifp || !ifp->info)
return 0;
zif = (struct zebra_if *)ifp->info;
/* Parse attributes and extract fields of interest. */
memset(tb, 0, sizeof tb);
netlink_parse_rtattr(tb, NDA_MAX, NDA_RTA(ndm), len);
if (!tb[NDA_DST]) {
zlog_debug("%s family %s IF %s(%u) - no DST",
nl_msg_type_to_str(h->nlmsg_type),
nl_family_to_str(ndm->ndm_family), ifp->name,
ndm->ndm_ifindex);
return 0;
}
memset(&ip, 0, sizeof(struct ipaddr));
ip.ipa_type = (ndm->ndm_family == AF_INET) ? IPADDR_V4 : IPADDR_V6;
memcpy(&ip.ip.addr, RTA_DATA(tb[NDA_DST]), RTA_PAYLOAD(tb[NDA_DST]));
/* if kernel deletes our rfc5549 neighbor entry, re-install it */
if (h->nlmsg_type == RTM_DELNEIGH && (ndm->ndm_state & NUD_PERMANENT)) {
netlink_handle_5549(ndm, zif, ifp, &ip, false);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"\tNeighbor Entry Received is a 5549 entry, finished");
return 0;
}
/* if kernel marks our rfc5549 neighbor entry invalid, re-install it */
if (h->nlmsg_type == RTM_NEWNEIGH && !(ndm->ndm_state & NUD_VALID))
netlink_handle_5549(ndm, zif, ifp, &ip, true);
/* The neighbor is present on an SVI. From this, we locate the
* underlying
* bridge because we're only interested in neighbors on a VxLAN bridge.
* The bridge is located based on the nature of the SVI:
* (a) In the case of a VLAN-aware bridge, the SVI is a L3 VLAN
* interface
* and is linked to the bridge
* (b) In the case of a VLAN-unaware bridge, the SVI is the bridge
* inteface
* itself
*/
if (IS_ZEBRA_IF_VLAN(ifp)) {
link_if = if_lookup_by_index_per_ns(zebra_ns_lookup(ns_id),
zif->link_ifindex);
if (!link_if)
return 0;
} else if (IS_ZEBRA_IF_BRIDGE(ifp))
link_if = ifp;
else {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"\tNeighbor Entry received is not on a VLAN or a BRIDGE, ignoring");
return 0;
}
memset(&mac, 0, sizeof(struct ethaddr));
if (h->nlmsg_type == RTM_NEWNEIGH) {
if (tb[NDA_LLADDR]) {
if (RTA_PAYLOAD(tb[NDA_LLADDR]) != ETH_ALEN) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"%s family %s IF %s(%u) - LLADDR is not MAC, len %lu",
nl_msg_type_to_str(
h->nlmsg_type),
nl_family_to_str(
ndm->ndm_family),
ifp->name, ndm->ndm_ifindex,
(unsigned long)RTA_PAYLOAD(
tb[NDA_LLADDR]));
return 0;
}
mac_present = 1;
memcpy(&mac, RTA_DATA(tb[NDA_LLADDR]), ETH_ALEN);
}
is_ext = !!(ndm->ndm_flags & NTF_EXT_LEARNED);
is_router = !!(ndm->ndm_flags & NTF_ROUTER);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"Rx %s family %s IF %s(%u) IP %s MAC %s state 0x%x flags 0x%x",
nl_msg_type_to_str(h->nlmsg_type),
nl_family_to_str(ndm->ndm_family), ifp->name,
ndm->ndm_ifindex,
ipaddr2str(&ip, buf2, sizeof(buf2)),
mac_present
? prefix_mac2str(&mac, buf, sizeof(buf))
: "",
ndm->ndm_state, ndm->ndm_flags);
/* If the neighbor state is valid for use, process as an add or
* update
* else process as a delete. Note that the delete handling may
* result
* in re-adding the neighbor if it is a valid "remote" neighbor.
*/
if (ndm->ndm_state & NUD_VALID)
return zebra_vxlan_handle_kernel_neigh_update(
ifp, link_if, &ip, &mac, ndm->ndm_state,
is_ext, is_router);
return zebra_vxlan_handle_kernel_neigh_del(ifp, link_if, &ip);
}
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Rx %s family %s IF %s(%u) IP %s",
nl_msg_type_to_str(h->nlmsg_type),
nl_family_to_str(ndm->ndm_family), ifp->name,
ndm->ndm_ifindex,
ipaddr2str(&ip, buf2, sizeof(buf2)));
/* Process the delete - it may result in re-adding the neighbor if it is
* a valid "remote" neighbor.
*/
return zebra_vxlan_handle_kernel_neigh_del(ifp, link_if, &ip);
}
static int netlink_neigh_table(struct nlmsghdr *h, ns_id_t ns_id, int startup)
{
int len;
struct ndmsg *ndm;
if (h->nlmsg_type != RTM_NEWNEIGH)
return 0;
/* Length validity. */
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct ndmsg));
if (len < 0)
return -1;
/* We are interested only in AF_INET or AF_INET6 notifications. */
ndm = NLMSG_DATA(h);
if (ndm->ndm_family != AF_INET && ndm->ndm_family != AF_INET6)
return 0;
return netlink_neigh_change(h, len);
}
/* Request for IP neighbor information from the kernel */
static int netlink_request_neigh(struct nlsock *netlink_cmd, int family,
int type, ifindex_t ifindex)
{
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
/* Form the request, specifying filter (rtattr) if needed. */
memset(&req, 0, sizeof(req));
req.n.nlmsg_type = type;
req.n.nlmsg_flags = NLM_F_ROOT | NLM_F_MATCH | NLM_F_REQUEST;
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.ndm.ndm_family = family;
if (ifindex)
addattr32(&req.n, sizeof(req), NDA_IFINDEX, ifindex);
return netlink_request(netlink_cmd, &req.n);
}
/*
* IP Neighbor table read using netlink interface. This is invoked
* at startup.
*/
int netlink_neigh_read(struct zebra_ns *zns)
{
int ret;
struct zebra_dplane_info dp_info;
zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
/* Get IP neighbor table. */
ret = netlink_request_neigh(&zns->netlink_cmd, AF_UNSPEC, RTM_GETNEIGH,
0);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_neigh_table, &zns->netlink_cmd,
&dp_info, 0, 1);
return ret;
}
/*
* IP Neighbor table read using netlink interface. This is for a specific
* VLAN device.
*/
int netlink_neigh_read_for_vlan(struct zebra_ns *zns, struct interface *vlan_if)
{
int ret = 0;
struct zebra_dplane_info dp_info;
zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
ret = netlink_request_neigh(&zns->netlink_cmd, AF_UNSPEC, RTM_GETNEIGH,
vlan_if->ifindex);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_neigh_table, &zns->netlink_cmd,
&dp_info, 0, 0);
return ret;
}
/*
* Request for a specific IP in VLAN (SVI) device from IP Neighbor table,
* read using netlink interface.
*/
static int netlink_request_specific_neigh_in_vlan(struct zebra_ns *zns,
int type, struct ipaddr *ip,
ifindex_t ifindex)
{
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
int ipa_len;
/* Form the request, specifying filter (rtattr) if needed. */
memset(&req, 0, sizeof(req));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_type = type; /* RTM_GETNEIGH */
req.ndm.ndm_ifindex = ifindex;
if (IS_IPADDR_V4(ip)) {
ipa_len = IPV4_MAX_BYTELEN;
req.ndm.ndm_family = AF_INET;
} else {
ipa_len = IPV6_MAX_BYTELEN;
req.ndm.ndm_family = AF_INET6;
}
addattr_l(&req.n, sizeof(req), NDA_DST, &ip->ip.addr, ipa_len);
return netlink_request(&zns->netlink_cmd, &req.n);
}
int netlink_neigh_read_specific_ip(struct ipaddr *ip,
struct interface *vlan_if)
{
int ret = 0;
struct zebra_ns *zns;
struct zebra_vrf *zvrf = zebra_vrf_lookup_by_id(vlan_if->vrf_id);
char buf[INET6_ADDRSTRLEN];
struct zebra_dplane_info dp_info;
zns = zvrf->zns;
zebra_dplane_info_from_zns(&dp_info, zns, true /*is_cmd*/);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: neigh request IF %s(%u) IP %s vrf_id %u",
__PRETTY_FUNCTION__, vlan_if->name,
vlan_if->ifindex,
ipaddr2str(ip, buf, sizeof(buf)),
vlan_if->vrf_id);
ret = netlink_request_specific_neigh_in_vlan(zns, RTM_GETNEIGH, ip,
vlan_if->ifindex);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_neigh_table, &zns->netlink_cmd,
&dp_info, 1, 0);
return ret;
}
int netlink_neigh_change(struct nlmsghdr *h, ns_id_t ns_id)
{
int len;
struct ndmsg *ndm;
if (!(h->nlmsg_type == RTM_NEWNEIGH || h->nlmsg_type == RTM_DELNEIGH))
return 0;
/* Length validity. */
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct ndmsg));
if (len < 0) {
zlog_err("%s: Message received from netlink is of a broken size %d %zu",
__PRETTY_FUNCTION__, h->nlmsg_len,
(size_t)NLMSG_LENGTH(sizeof(struct ndmsg)));
return -1;
}
/* Is this a notification for the MAC FDB or IP neighbor table? */
ndm = NLMSG_DATA(h);
if (ndm->ndm_family == AF_BRIDGE)
return netlink_macfdb_change(h, len, ns_id);
if (ndm->ndm_type != RTN_UNICAST)
return 0;
if (ndm->ndm_family == AF_INET || ndm->ndm_family == AF_INET6)
return netlink_ipneigh_change(h, len, ns_id);
else {
flog_warn(
EC_ZEBRA_UNKNOWN_FAMILY,
"Invalid address family: %u received from kernel neighbor change: %s",
ndm->ndm_family, nl_msg_type_to_str(h->nlmsg_type));
return 0;
}
return 0;
}
/*
* Utility neighbor-update function, using info from dplane context.
*/
static int netlink_neigh_update_ctx(const struct zebra_dplane_ctx *ctx,
int cmd)
{
uint8_t protocol = RTPROT_ZEBRA;
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
int ipa_len;
char buf[INET6_ADDRSTRLEN];
char buf2[ETHER_ADDR_STRLEN];
const struct ipaddr *ip;
const struct ethaddr *mac;
uint8_t flags;
uint16_t state;
memset(&req, 0, sizeof(req));
ip = dplane_ctx_neigh_get_ipaddr(ctx);
mac = dplane_ctx_neigh_get_mac(ctx);
if (is_zero_mac(mac))
mac = NULL;
flags = neigh_flags_to_netlink(dplane_ctx_neigh_get_flags(ctx));
state = neigh_state_to_netlink(dplane_ctx_neigh_get_state(ctx));
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.n.nlmsg_flags = NLM_F_REQUEST;
if (cmd == RTM_NEWNEIGH)
req.n.nlmsg_flags |= (NLM_F_CREATE | NLM_F_REPLACE);
req.n.nlmsg_type = cmd; // RTM_NEWNEIGH or RTM_DELNEIGH
req.ndm.ndm_family = IS_IPADDR_V4(ip) ? AF_INET : AF_INET6;
req.ndm.ndm_state = state;
req.ndm.ndm_ifindex = dplane_ctx_get_ifindex(ctx);
req.ndm.ndm_type = RTN_UNICAST;
req.ndm.ndm_flags = flags;
addattr_l(&req.n, sizeof(req),
NDA_PROTOCOL, &protocol, sizeof(protocol));
ipa_len = IS_IPADDR_V4(ip) ? IPV4_MAX_BYTELEN : IPV6_MAX_BYTELEN;
addattr_l(&req.n, sizeof(req), NDA_DST, &ip->ip.addr, ipa_len);
if (mac)
addattr_l(&req.n, sizeof(req), NDA_LLADDR, mac, 6);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Tx %s family %s IF %s(%u) Neigh %s MAC %s flags 0x%x state 0x%x",
nl_msg_type_to_str(cmd),
nl_family_to_str(req.ndm.ndm_family),
dplane_ctx_get_ifname(ctx),
dplane_ctx_get_ifindex(ctx),
ipaddr2str(ip, buf, sizeof(buf)),
mac ? prefix_mac2str(mac, buf2, sizeof(buf2))
: "null",
flags, state);
return netlink_talk_info(netlink_talk_filter, &req.n,
dplane_ctx_get_ns(ctx), 0);
}
/*
* Update MAC, using dataplane context object.
*/
enum zebra_dplane_result kernel_mac_update_ctx(struct zebra_dplane_ctx *ctx)
{
return netlink_macfdb_update_ctx(ctx);
}
enum zebra_dplane_result kernel_neigh_update_ctx(struct zebra_dplane_ctx *ctx)
{
int ret = -1;
switch (dplane_ctx_get_op(ctx)) {
case DPLANE_OP_NEIGH_INSTALL:
case DPLANE_OP_NEIGH_UPDATE:
ret = netlink_neigh_update_ctx(ctx, RTM_NEWNEIGH);
break;
case DPLANE_OP_NEIGH_DELETE:
ret = netlink_neigh_update_ctx(ctx, RTM_DELNEIGH);
break;
case DPLANE_OP_VTEP_ADD:
ret = netlink_vxlan_flood_update_ctx(ctx, RTM_NEWNEIGH);
break;
case DPLANE_OP_VTEP_DELETE:
ret = netlink_vxlan_flood_update_ctx(ctx, RTM_DELNEIGH);
break;
default:
break;
}
return (ret == 0 ?
ZEBRA_DPLANE_REQUEST_SUCCESS : ZEBRA_DPLANE_REQUEST_FAILURE);
}
/*
* MPLS label forwarding table change via netlink interface, using dataplane
* context information.
*/
int netlink_mpls_multipath(int cmd, struct zebra_dplane_ctx *ctx)
{
mpls_lse_t lse;
const zebra_nhlfe_t *nhlfe;
struct nexthop *nexthop = NULL;
unsigned int nexthop_num;
const char *routedesc;
int route_type;
struct {
struct nlmsghdr n;
struct rtmsg r;
char buf[NL_PKT_BUF_SIZE];
} req;
memset(&req, 0, sizeof(req) - NL_PKT_BUF_SIZE);
/*
* Count # nexthops so we can decide whether to use singlepath
* or multipath case.
*/
nexthop_num = 0;
for (nhlfe = dplane_ctx_get_nhlfe(ctx); nhlfe; nhlfe = nhlfe->next) {
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
if (cmd == RTM_NEWROUTE) {
/* Count all selected NHLFEs */
if (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED)
&& CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_ACTIVE))
nexthop_num++;
} else { /* DEL */
/* Count all installed NHLFEs */
if (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_INSTALLED)
&& CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB))
nexthop_num++;
}
}
if ((nexthop_num == 0) ||
(!dplane_ctx_get_best_nhlfe(ctx) && (cmd != RTM_DELROUTE)))
return 0;
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct rtmsg));
req.n.nlmsg_flags = NLM_F_CREATE | NLM_F_REQUEST;
req.n.nlmsg_type = cmd;
req.n.nlmsg_pid = dplane_ctx_get_ns(ctx)->nls.snl.nl_pid;
req.r.rtm_family = AF_MPLS;
req.r.rtm_table = RT_TABLE_MAIN;
req.r.rtm_dst_len = MPLS_LABEL_LEN_BITS;
req.r.rtm_scope = RT_SCOPE_UNIVERSE;
req.r.rtm_type = RTN_UNICAST;
if (cmd == RTM_NEWROUTE) {
/* We do a replace to handle update. */
req.n.nlmsg_flags |= NLM_F_REPLACE;
/* set the protocol value if installing */
route_type = re_type_from_lsp_type(
dplane_ctx_get_best_nhlfe(ctx)->type);
req.r.rtm_protocol = zebra2proto(route_type);
}
/* Fill destination */
lse = mpls_lse_encode(dplane_ctx_get_in_label(ctx), 0, 0, 1);
addattr_l(&req.n, sizeof(req), RTA_DST, &lse, sizeof(mpls_lse_t));
/* Fill nexthops (paths) based on single-path or multipath. The paths
* chosen depend on the operation.
*/
if (nexthop_num == 1) {
routedesc = "single-path";
_netlink_mpls_debug(cmd, dplane_ctx_get_in_label(ctx),
routedesc);
nexthop_num = 0;
for (nhlfe = dplane_ctx_get_nhlfe(ctx);
nhlfe; nhlfe = nhlfe->next) {
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
if ((cmd == RTM_NEWROUTE
&& (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED)
&& CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_ACTIVE)))
|| (cmd == RTM_DELROUTE
&& (CHECK_FLAG(nhlfe->flags,
NHLFE_FLAG_INSTALLED)
&& CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_FIB)))) {
/* Add the gateway */
_netlink_mpls_build_singlepath(
routedesc, nhlfe,
&req.n, &req.r,
sizeof(req), cmd);
nexthop_num++;
break;
}
}
} else { /* Multipath case */
char buf[NL_PKT_BUF_SIZE];
struct rtattr *rta = (void *)buf;
struct rtnexthop *rtnh;
const union g_addr *src1 = NULL;
rta->rta_type = RTA_MULTIPATH;
rta->rta_len = RTA_LENGTH(0);
rtnh = RTA_DATA(rta);
routedesc = "multipath";
_netlink_mpls_debug(cmd, dplane_ctx_get_in_label(ctx),
routedesc);
nexthop_num = 0;
for (nhlfe = dplane_ctx_get_nhlfe(ctx);
nhlfe; nhlfe = nhlfe->next) {
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
if ((cmd == RTM_NEWROUTE
&& (CHECK_FLAG(nhlfe->flags, NHLFE_FLAG_SELECTED)
&& CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_ACTIVE)))
|| (cmd == RTM_DELROUTE
&& (CHECK_FLAG(nhlfe->flags,
NHLFE_FLAG_INSTALLED)
&& CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_FIB)))) {
nexthop_num++;
/* Build the multipath */
_netlink_mpls_build_multipath(routedesc, nhlfe,
rta, rtnh, &req.r,
&src1);
rtnh = RTNH_NEXT(rtnh);
}
}
/* Add the multipath */
if (rta->rta_len > RTA_LENGTH(0))
addattr_l(&req.n, NL_PKT_BUF_SIZE, RTA_MULTIPATH,
RTA_DATA(rta), RTA_PAYLOAD(rta));
}
/* Talk to netlink socket. */
return netlink_talk_info(netlink_talk_filter, &req.n,
dplane_ctx_get_ns(ctx), 0);
}
#endif /* HAVE_NETLINK */
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