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mirror_frr/zebra/rt_netlink.c
Donald Sharp 6b093863ec zebra: Allow runtime determination of v6 RR semantics 
The linux kernel is getting the same Route Replace semantics
for v6 that v4 uses.  Allow the end-user to know if their
kernel has this ability and if so to specify it so zebra
can take advantage of this.

Why not do auto-detection?  Because you would have to write
code in zebra to add a route then add the same route again
with different nexthops to see if which semantics it is using.
It sure is easier to just add a cli that allows the user to
do it.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
2018-05-18 15:42:17 -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>
/* 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 "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_mroute.h"
#include "zebra/zebra_vxlan.h"
#ifndef AF_MPLS
#define AF_MPLS 28
#endif
static vlanid_t filter_vlan = 0;
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);
}
static inline int is_selfroute(int proto)
{
if ((proto == RTPROT_BGP) || (proto == RTPROT_OSPF)
|| (proto == RTPROT_STATIC) || (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)) {
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_STATIC;
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;
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_warn("%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)
{
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:
proto = ZEBRA_ROUTE_STATIC;
break;
case RTPROT_SHARP:
proto = ZEBRA_ROUTE_SHARP;
break;
case RTPROT_PBR:
proto = ZEBRA_ROUTE_PBR;
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_warn("%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;
}
/* Looking up routing table by netlink interface. */
static int netlink_route_change_read_unicast(struct sockaddr_nl *snl,
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;
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:
return 0;
}
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct rtmsg));
if (len < 0)
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)
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);
}
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_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;
memcpy(&p.u.prefix4, dest, 4);
p.prefixlen = rtm->rtm_dst_len;
src_p.prefixlen =
0; // Forces debug below to not display anything
} else if (rtm->rtm_family == AF_INET6) {
p.family = AF_INET6;
memcpy(&p.u.prefix6, dest, 16);
p.prefixlen = rtm->rtm_dst_len;
src_p.family = AF_INET6;
memcpy(&src_p.prefix, src, 16);
src_p.prefixlen = rtm->rtm_src_len;
}
if (rtm->rtm_src_len != 0) {
char buf[PREFIX_STRLEN];
zlog_warn(
"unsupported IPv[4|6] sourcedest route (dest %s vrf %u)",
prefix2str(&p, buf, sizeof(buf)), vrf_id);
return 0;
}
/*
* 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) {
struct interface *ifp;
vrf_id_t nh_vrf_id = vrf_id;
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 = 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(index, VRF_UNKNOWN);
if (ifp)
nh_vrf_id = ifp->vrf_id;
}
nh.vrf_id = nh_vrf_id;
rib_add(afi, SAFI_UNICAST, vrf_id, proto, 0, flags, &p,
NULL, &nh, 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]);
len = RTA_PAYLOAD(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->nexthop_num = 0;
re->uptime = time(NULL);
re->tag = tag;
for (;;) {
vrf_id_t nh_vrf_id;
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(index,
VRF_UNKNOWN);
if (ifp)
nh_vrf_id = ifp->vrf_id;
else {
zlog_warn(
"%s: Unknown interface %u specified, defaulting to VRF_DEFAULT",
__PRETTY_FUNCTION__,
index);
nh_vrf_id = VRF_DEFAULT;
}
} else
nh_vrf_id = vrf_id;
gate = 0;
if (rtnh->rtnh_len > sizeof(*rtnh)) {
memset(tb, 0, sizeof(tb));
netlink_parse_rtattr(
tb, RTA_MAX, RTNH_DATA(rtnh),
rtnh->rtnh_len - sizeof(*rtnh));
if (tb[RTA_GATEWAY])
gate = RTA_DATA(
tb[RTA_GATEWAY]);
}
if (gate) {
if (rtm->rtm_family == AF_INET) {
if (index)
route_entry_nexthop_ipv4_ifindex_add(
re, gate,
prefsrc, index,
nh_vrf_id);
else
route_entry_nexthop_ipv4_add(
re, gate,
prefsrc,
nh_vrf_id);
} else if (rtm->rtm_family
== AF_INET6) {
if (index)
route_entry_nexthop_ipv6_ifindex_add(
re, gate, index,
nh_vrf_id);
else
route_entry_nexthop_ipv6_add(
re, gate,
nh_vrf_id);
}
} else
route_entry_nexthop_ifindex_add(
re, index, nh_vrf_id);
len -= NLMSG_ALIGN(rtnh->rtnh_len);
rtnh = RTNH_NEXT(rtnh);
}
zserv_nexthop_num_warn(__func__,
(const struct prefix *)&p,
re->nexthop_num);
if (re->nexthop_num == 0)
XFREE(MTYPE_RE, re);
else
rib_add_multipath(afi, SAFI_UNICAST, &p, NULL,
re);
}
} 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, NULL, &nh, table, metric, 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, NULL, NULL, table, metric, true);
}
}
return 0;
}
static struct mcast_route_data *mroute = NULL;
static int netlink_route_change_read_multicast(struct sockaddr_nl *snl,
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 ((RTA_EXPIRES <= RTA_MAX) && 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++;
len -= NLMSG_ALIGN(rtnh->rtnh_len);
rtnh = RTNH_NEXT(rtnh);
}
}
if (IS_ZEBRA_DEBUG_KERNEL) {
struct interface *ifp;
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 ", ifp->name);
strcat(oif_list, temp);
}
struct zebra_vrf *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 OIF: %s jiffies: %lld",
zvrf->vrf->name, vrf, nl_msg_type_to_str(h->nlmsg_type),
sbuf, gbuf, ifp->name, oif_list, m->lastused);
}
return 0;
}
int netlink_route_change(struct sockaddr_nl *snl, 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_warn("Kernel message: %d NS %u\n", h->nlmsg_type, ns_id);
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);
/* We don't care about change notifications for the MPLS table. */
/* TODO: Revisit this. */
if (rtm->rtm_family == AF_MPLS)
return 0;
len = h->nlmsg_len - NLMSG_LENGTH(sizeof(struct rtmsg));
if (len < 0)
return -1;
if (rtm->rtm_type == RTN_MULTICAST)
netlink_route_change_read_multicast(snl, h, ns_id, startup);
else
netlink_route_change_read_unicast(snl, 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_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;
/* 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, zns, 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, zns, 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,
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,
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;
}
}
/* 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,
struct nexthop *nexthop,
struct nlmsghdr *nlmsg,
struct rtmsg *rtmsg,
size_t req_size, int cmd)
{
struct mpls_label_stack *nh_label;
mpls_lse_t out_lse[MPLS_MAX_LABELS];
int num_labels = 0;
char label_buf[256];
/*
* 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';
assert(nexthop);
for (struct nexthop *nh = nexthop; nh; nh = nh->rparent) {
char label_buf1[20];
nh_label = nh->nh_label;
if (!nh_label || !nh_label->num_labels)
continue;
for (int i = 0; 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,
sizeof(label_buf));
}
}
out_lse[num_labels] =
mpls_lse_encode(nh_label->label[i], 0, 0, 0);
num_labels++;
}
}
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
|| nexthop->type == NEXTHOP_TYPE_IPV4_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);
}
if (nexthop->type == NEXTHOP_TYPE_IPV6_IFINDEX) {
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 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,
struct nexthop *nexthop,
struct rtattr *rta,
struct rtnexthop *rtnh,
struct rtmsg *rtmsg,
union g_addr **src)
{
struct mpls_label_stack *nh_label;
mpls_lse_t out_lse[MPLS_MAX_LABELS];
int num_labels = 0;
char label_buf[256];
rtnh->rtnh_len = sizeof(*rtnh);
rtnh->rtnh_flags = 0;
rtnh->rtnh_hops = 0;
rta->rta_len += rtnh->rtnh_len;
/*
* 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';
assert(nexthop);
for (struct nexthop *nh = nexthop; nh; nh = nh->rparent) {
char label_buf1[20];
nh_label = nh->nh_label;
if (!nh_label || !nh_label->num_labels)
continue;
for (int i = 0; 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,
sizeof(label_buf));
}
}
out_lse[num_labels] =
mpls_lse_encode(nh_label->label[i], 0, 0, 0);
num_labels++;
}
}
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_IPV4_IFINDEX
|| 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,
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, zebra_nhlfe_t *nhlfe,
struct rtattr *rta, struct rtnexthop *rtnh,
struct rtmsg *rtmsg, 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, struct prefix *p,
int family, struct zebra_vrf *zvrf,
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)),
zvrf_id(zvrf), tableid);
}
}
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)
{
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_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. */
/* Update flag indicates whether this is a "replace" or not. */
static int netlink_route_multipath(int cmd, struct prefix *p,
struct prefix *src_p, struct route_entry *re,
int update)
{
int bytelen;
struct sockaddr_nl snl;
struct nexthop *nexthop = NULL;
unsigned int nexthop_num;
int family = PREFIX_FAMILY(p);
const char *routedesc;
int setsrc = 0;
union g_addr src;
struct {
struct nlmsghdr n;
struct rtmsg r;
char buf[NL_PKT_BUF_SIZE];
} req;
struct zebra_ns *zns;
struct zebra_vrf *zvrf = vrf_info_lookup(re->vrf_id);
zns = zvrf->zns;
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) && update)
req.n.nlmsg_flags |= NLM_F_REPLACE;
req.n.nlmsg_type = cmd;
req.n.nlmsg_pid = zns->netlink_cmd.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_protocol = zebra2proto(re->type);
req.r.rtm_scope = RT_SCOPE_UNIVERSE;
/*
* 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)
if (re->tag > 0 && re->tag <= 255)
addattr32(&req.n, sizeof req, RTA_FLOW, re->tag);
#endif
/* Table corresponding to this route. */
if (re->table < 256)
req.r.rtm_table = re->table;
else {
req.r.rtm_table = RT_TABLE_UNSPEC;
addattr32(&req.n, sizeof req, RTA_TABLE, re->table);
}
_netlink_route_debug(cmd, p, family, zvrf, re->table);
/*
* 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 (!update && cmd == RTM_DELROUTE)
goto skip;
if (re->mtu || re->nexthop_mtu) {
char buf[NL_PKT_BUF_SIZE];
struct rtattr *rta = (void *)buf;
uint32_t mtu = re->mtu;
if (!mtu || (re->nexthop_mtu && re->nexthop_mtu < mtu))
mtu = re->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));
}
/* Count overall nexthops so we can decide whether to use singlepath
* or multipath case. */
nexthop_num = 0;
for (ALL_NEXTHOPS(re->ng, nexthop)) {
if (CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_RECURSIVE))
continue;
if (cmd == RTM_NEWROUTE && !NEXTHOP_IS_ACTIVE(nexthop->flags))
continue;
if (cmd == RTM_DELROUTE
&& !CHECK_FLAG(nexthop->flags, NEXTHOP_FLAG_FIB))
continue;
nexthop_num++;
}
/* Singlepath case. */
if (nexthop_num == 1 || multipath_num == 1) {
nexthop_num = 0;
for (ALL_NEXTHOPS(re->ng, 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) {
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))
|| (cmd == RTM_DELROUTE
&& CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_FIB))) {
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 {
char buf[NL_PKT_BUF_SIZE];
struct rtattr *rta = (void *)buf;
struct rtnexthop *rtnh;
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(re->ng, nexthop)) {
if (nexthop_num >= multipath_num)
break;
if (CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_RECURSIVE)) {
/* This only works for IPv4 now */
if (!setsrc) {
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))
|| (cmd == RTM_DELROUTE
&& CHECK_FLAG(nexthop->flags,
NEXTHOP_FLAG_FIB))) {
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:
/* Destination netlink address. */
memset(&snl, 0, sizeof snl);
snl.nl_family = AF_NETLINK;
/* Talk to netlink socket. */
return netlink_talk(netlink_talk_filter, &req.n, &zns->netlink_cmd, zns,
0);
}
int kernel_get_ipmr_sg_stats(struct zebra_vrf *zvrf, void *in)
{
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);
addattr_l(&req.n, sizeof(req), RTA_TABLE, &zvrf->table_id, 4);
suc = netlink_talk(netlink_route_change_read_multicast, &req.n,
&zns->netlink_cmd, zns, 0);
mroute = NULL;
return suc;
}
void kernel_route_rib(struct route_node *rn, struct prefix *p,
struct prefix *src_p, struct route_entry *old,
struct route_entry *new)
{
int ret = 0;
assert(old || new);
if (new) {
if (p->family == AF_INET || v6_rr_semantics)
ret = netlink_route_multipath(RTM_NEWROUTE, p, src_p,
new, (old) ? 1 : 0);
else {
/*
* So v6 route replace semantics are not in
* the kernel at this point as I understand it.
* So let's do a delete than 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 (old)
netlink_route_multipath(RTM_DELROUTE, p, src_p,
old, 0);
ret = netlink_route_multipath(RTM_NEWROUTE, p, src_p,
new, 0);
}
kernel_route_rib_pass_fail(rn, p, new,
(!ret) ? SOUTHBOUND_INSTALL_SUCCESS
: SOUTHBOUND_INSTALL_FAILURE);
return;
}
if (old) {
ret = netlink_route_multipath(RTM_DELROUTE, p, src_p, old, 0);
kernel_route_rib_pass_fail(rn, p, old,
(!ret) ? SOUTHBOUND_DELETE_SUCCESS
: SOUTHBOUND_DELETE_FAILURE);
}
}
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_list_update(struct interface *ifp,
struct in_addr *vtep_ip, int cmd)
{
struct zebra_ns *zns;
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
uint8_t dst_mac[6] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0};
struct zebra_vrf *zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
zns = zvrf->zns;
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_LLADDR, &dst_mac, 6);
req.ndm.ndm_ifindex = ifp->ifindex;
addattr_l(&req.n, sizeof(req), NDA_DST, &vtep_ip->s_addr, 4);
return netlink_talk(netlink_talk_filter, &req.n, &zns->netlink_cmd, zns,
0);
}
/*
* Add remote VTEP for this VxLAN interface (VNI). In Linux, this involves
* adding
* a "flood" MAC FDB entry.
*/
int kernel_add_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip)
{
if (IS_ZEBRA_DEBUG_VXLAN)
zlog_debug("Install %s into flood list for VNI %u intf %s(%u)",
inet_ntoa(*vtep_ip), vni, ifp->name, ifp->ifindex);
return netlink_vxlan_flood_list_update(ifp, vtep_ip, RTM_NEWNEIGH);
}
/*
* Remove remote VTEP for this VxLAN interface (VNI). In Linux, this involves
* deleting the "flood" MAC FDB entry.
*/
int kernel_del_vtep(vni_t vni, struct interface *ifp, struct in_addr *vtep_ip)
{
if (IS_ZEBRA_DEBUG_VXLAN)
zlog_debug(
"Uninstall %s from flood list for VNI %u intf %s(%u)",
inet_ntoa(*vtep_ip), vni, ifp->name, ifp->ifindex);
return netlink_vxlan_flood_list_update(ifp, vtep_ip, RTM_DELNEIGH);
}
#ifndef NDA_RTA
#define NDA_RTA(r) \
((struct rtattr *)(((char *)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
#endif
static int netlink_macfdb_change(struct sockaddr_nl *snl, 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];
uint8_t sticky = 0;
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)
return 0;
/* The interface should be something we're interested in. */
if (!IS_ZEBRA_IF_BRIDGE_SLAVE(ifp))
return 0;
/* Drop "permanent" entries. */
if (ndm->ndm_state & NUD_PERMANENT)
return 0;
zif = (struct zebra_if *)ifp->info;
if ((br_if = zif->brslave_info.br_if) == NULL) {
zlog_warn("%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]) {
zlog_warn("%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) {
zlog_warn(
"%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) ? 1 : 0;
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)
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) {
/* Drop "permanent" entries. */
if (ndm->ndm_state & NUD_PERMANENT)
return 0;
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)
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 sockaddr_nl *snl, 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(snl, h, len, ns_id);
}
/* Request for MAC FDB information from the kernel */
static int netlink_request_macs(struct zebra_ns *zns, 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_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(&zns->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;
/* Get bridge FDB table. */
ret = netlink_request_macs(zns, 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, zns,
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;
int ret = 0;
/* 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, AF_BRIDGE, RTM_GETNEIGH,
br_if->ifindex);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_macfdb_table, &zns->netlink_cmd, zns,
0, 0);
/* Reset VLAN filter. */
filter_vlan = 0;
return ret;
}
static int netlink_macfdb_update(struct interface *ifp, vlanid_t vid,
struct ethaddr *mac, struct in_addr vtep_ip,
int local, int cmd, uint8_t sticky)
{
struct zebra_ns *zns;
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
int dst_alen;
struct zebra_if *zif;
struct interface *br_if;
struct zebra_if *br_zif;
char buf[ETHER_ADDR_STRLEN];
int vid_present = 0, dst_present = 0;
char vid_buf[20];
char dst_buf[30];
struct zebra_vrf *zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
zns = zvrf->zns;
zif = ifp->info;
if ((br_if = zif->brslave_info.br_if) == NULL) {
zlog_warn("MAC %s on IF %s(%u) - no mapping to bridge",
(cmd == RTM_NEWNEIGH) ? "add" : "del", ifp->name,
ifp->ifindex);
return -1;
}
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 (sticky)
req.ndm.ndm_state |= NUD_NOARP;
else
req.ndm.ndm_flags |= NTF_EXT_LEARNED;
addattr_l(&req.n, sizeof(req), NDA_LLADDR, mac, 6);
req.ndm.ndm_ifindex = ifp->ifindex;
if (!local) {
dst_alen = 4; // TODO: hardcoded
addattr_l(&req.n, sizeof(req), NDA_DST, &vtep_ip, dst_alen);
dst_present = 1;
sprintf(dst_buf, " dst %s", inet_ntoa(vtep_ip));
}
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);
vid_present = 1;
sprintf(vid_buf, " VLAN %u", vid);
}
addattr32(&req.n, sizeof(req), NDA_MASTER, br_if->ifindex);
if (IS_ZEBRA_DEBUG_KERNEL)
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), ifp->name,
ifp->ifindex, vid_present ? vid_buf : "",
sticky ? "sticky " : "",
prefix_mac2str(mac, buf, sizeof(buf)),
dst_present ? dst_buf : "");
return netlink_talk(netlink_talk_filter, &req.n, &zns->netlink_cmd, zns,
0);
}
#define NUD_VALID \
(NUD_PERMANENT | NUD_NOARP | NUD_REACHABLE | NUD_PROBE | NUD_STALE \
| NUD_DELAY)
static int netlink_ipneigh_change(struct sockaddr_nl *snl, 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;
uint8_t ext_learned;
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_warn("%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]));
/* Drop some "permanent" entries. */
if (ndm->ndm_state & NUD_PERMANENT) {
char buf[16] = "169.254.0.1";
struct in_addr ipv4_ll;
if (ndm->ndm_family != AF_INET)
return 0;
if (!zif->v6_2_v4_ll_neigh_entry)
return 0;
if (h->nlmsg_type != RTM_DELNEIGH)
return 0;
inet_pton(AF_INET, buf, &ipv4_ll);
if (ipv4_ll.s_addr != ip.ip._v4_addr.s_addr)
return 0;
if_nbr_ipv6ll_to_ipv4ll_neigh_update(
ifp, &zif->v6_2_v4_ll_addr6, true);
return 0;
}
/* 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
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) {
zlog_warn(
"%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);
}
ext_learned = (ndm->ndm_flags & NTF_EXT_LEARNED) ? 1 : 0;
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,
ext_learned);
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 sockaddr_nl *snl, 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(snl, h, len);
}
/* Request for IP neighbor information from the kernel */
static int netlink_request_neigh(struct zebra_ns *zns, 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_len = NLMSG_LENGTH(sizeof(struct ndmsg));
req.ndm.ndm_family = family;
if (ifindex)
addattr32(&req.n, sizeof(req), NDA_IFINDEX, ifindex);
return netlink_request(&zns->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;
/* Get IP neighbor table. */
ret = netlink_request_neigh(zns, AF_UNSPEC, RTM_GETNEIGH, 0);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_neigh_table, &zns->netlink_cmd, zns, 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;
ret = netlink_request_neigh(zns, AF_UNSPEC, RTM_GETNEIGH,
vlan_if->ifindex);
if (ret < 0)
return ret;
ret = netlink_parse_info(netlink_neigh_table, &zns->netlink_cmd, zns, 0,
0);
return ret;
}
int netlink_neigh_change(struct sockaddr_nl *snl, 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)
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(snl, 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(snl, h, len, ns_id);
return 0;
}
static int netlink_neigh_update2(struct interface *ifp, struct ipaddr *ip,
struct ethaddr *mac, uint32_t flags, int cmd)
{
struct {
struct nlmsghdr n;
struct ndmsg ndm;
char buf[256];
} req;
int ipa_len;
struct zebra_ns *zns;
char buf[INET6_ADDRSTRLEN];
char buf2[ETHER_ADDR_STRLEN];
struct zebra_vrf *zvrf = zebra_vrf_lookup_by_id(ifp->vrf_id);
zns = zvrf->zns;
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; // RTM_NEWNEIGH or RTM_DELNEIGH
req.ndm.ndm_family = IS_IPADDR_V4(ip) ? AF_INET : AF_INET6;
req.ndm.ndm_state = flags;
req.ndm.ndm_ifindex = ifp->ifindex;
req.ndm.ndm_type = RTN_UNICAST;
req.ndm.ndm_flags = NTF_EXT_LEARNED;
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",
nl_msg_type_to_str(cmd),
nl_family_to_str(req.ndm.ndm_family), ifp->name,
ifp->ifindex, ipaddr2str(ip, buf, sizeof(buf)),
mac ? prefix_mac2str(mac, buf2, sizeof(buf2))
: "null");
return netlink_talk(netlink_talk_filter, &req.n, &zns->netlink_cmd, zns,
0);
}
int kernel_add_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac,
struct in_addr vtep_ip, uint8_t sticky)
{
return netlink_macfdb_update(ifp, vid, mac, vtep_ip, 0, RTM_NEWNEIGH,
sticky);
}
int kernel_del_mac(struct interface *ifp, vlanid_t vid, struct ethaddr *mac,
struct in_addr vtep_ip, int local)
{
return netlink_macfdb_update(ifp, vid, mac, vtep_ip, local,
RTM_DELNEIGH, 0);
}
int kernel_add_neigh(struct interface *ifp, struct ipaddr *ip,
struct ethaddr *mac)
{
return netlink_neigh_update2(ifp, ip, mac, NUD_NOARP, RTM_NEWNEIGH);
}
int kernel_del_neigh(struct interface *ifp, struct ipaddr *ip)
{
return netlink_neigh_update2(ifp, ip, NULL, 0, RTM_DELNEIGH);
}
/*
* MPLS label forwarding table change via netlink interface.
*/
int netlink_mpls_multipath(int cmd, zebra_lsp_t *lsp)
{
mpls_lse_t lse;
zebra_nhlfe_t *nhlfe;
struct nexthop *nexthop = NULL;
unsigned int nexthop_num;
const char *routedesc;
struct zebra_ns *zns = zebra_ns_lookup(NS_DEFAULT);
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 = lsp->nhlfe_list; 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) || (!lsp->best_nhlfe && (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 = zns->netlink_cmd.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(lsp->best_nhlfe->type);
req.r.rtm_protocol = zebra2proto(route_type);
}
/* Fill destination */
lse = mpls_lse_encode(lsp->ile.in_label, 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 || multipath_num == 1) {
routedesc = "single-path";
_netlink_mpls_debug(cmd, lsp->ile.in_label, routedesc);
nexthop_num = 0;
for (nhlfe = lsp->nhlfe_list; 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;
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, lsp->ile.in_label, routedesc);
nexthop_num = 0;
for (nhlfe = lsp->nhlfe_list; nhlfe; nhlfe = nhlfe->next) {
nexthop = nhlfe->nexthop;
if (!nexthop)
continue;
if (nexthop_num >= multipath_num)
break;
if ((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(netlink_talk_filter, &req.n, &zns->netlink_cmd, zns,
0);
}
#endif /* HAVE_NETLINK */
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