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rt_netlink.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/* Kernel routing table updates using netlink over GNU/Linux system.
* Copyright (C) 1997, 98, 99 Kunihiro Ishiguro
*/
#include <zebra.h>
#ifdef HAVE_NETLINK
/* The following definition is to workaround an issue in the Linux kernel
* header files with redefinition of 'struct in6_addr' in both
* netinet/in.h and linux/in6.h.
* Reference - https://sourceware.org/ml/libc-alpha/2013-01/msg00599.html
*/
#define _LINUX_IN6_H
#include <net/if_arp.h>
#include <linux/lwtunnel.h>
#include <linux/mpls_iptunnel.h>
#include <linux/seg6_iptunnel.h>
#include <linux/seg6_local.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 "plist.h"
#include "plist_int.h"
#include "connected.h"
#include "table.h"
#include "memory.h"
#include "rib.h"
#include "frrevent.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"
#include "zebra/zebra_evpn_mh.h"
#include "zebra/zebra_trace.h"
#include "zebra/zebra_neigh.h"
#ifndef AF_MPLS
#define AF_MPLS 28
#endif
/* Re-defining as I am unable to include <linux/if_bridge.h> which has the
* UAPI for MAC sync. */
#ifndef _UAPI_LINUX_IF_BRIDGE_H
#define BR_SPH_LIST_SIZE 10
#endif
static vlanid_t filter_vlan = 0;
/* We capture whether the current kernel supports nexthop ids; by
* default, we'll use them if possible. There's also a configuration
* available to _disable_ use of kernel nexthops.
*/
static bool supports_nh;
struct gw_family_t {
uint16_t filler;
uint16_t family;
union g_addr gate;
};
static const char ipv4_ll_buf[16] = "169.254.0.1";
static struct in_addr ipv4_ll;
/* Is this a ipv4 over ipv6 route? */
static bool is_route_v4_over_v6(unsigned char rtm_family,
enum nexthop_types_t nexthop_type)
{
if (rtm_family == AF_INET
&& (nexthop_type == NEXTHOP_TYPE_IPV6
|| nexthop_type == NEXTHOP_TYPE_IPV6_IFINDEX))
return true;
return false;
}
/* Helper to control use of kernel-level nexthop ids */
static bool kernel_nexthops_supported(void)
{
return (supports_nh && !vrf_is_backend_netns()
&& zebra_nhg_kernel_nexthops_enabled());
}
/*
* Some people may only want to use NHGs created by protos and not
* implicitly created by Zebra. This check accounts for that.
*/
static bool proto_nexthops_only(void)
{
return zebra_nhg_proto_nexthops_only();
}
/* Is this a proto created NHG? */
static bool is_proto_nhg(uint32_t id, int type)
{
/* If type is available, use it as the source of truth */
if (type) {
if (type != ZEBRA_ROUTE_NHG)
return true;
return false;
}
if (id >= ZEBRA_NHG_PROTO_LOWER)
return true;
return false;
}
/* Is vni mcast group */
static bool is_mac_vni_mcast_group(struct ethaddr *mac, vni_t vni,
struct in_addr grp_addr)
{
if (!vni)
return false;
if (!is_zero_mac(mac))
return false;
if (!IN_MULTICAST(ntohl(grp_addr.s_addr)))
return false;
return true;
}
/*
* 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;
if (dplane_flags & DPLANE_NTF_USE)
flags |= NTF_USE;
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;
if (dplane_state & DPLANE_NUD_INCOMPLETE)
state |= NUD_INCOMPLETE;
if (dplane_state & DPLANE_NUD_PERMANENT)
state |= NUD_PERMANENT;
if (dplane_state & DPLANE_NUD_FAILED)
state |= NUD_FAILED;
return state;
}
static inline bool 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)
|| (proto == RTPROT_SRTE)) {
return true;
}
return false;
}
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_SRTE:
proto = RTPROT_SRTE;
break;
case ZEBRA_ROUTE_TABLE:
case ZEBRA_ROUTE_NHG:
proto = RTPROT_ZEBRA;
break;
case ZEBRA_ROUTE_CONNECT:
case ZEBRA_ROUTE_KERNEL:
proto = RTPROT_KERNEL;
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",
__func__, 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 == AF_INET) ? 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_SRTE:
proto = ZEBRA_ROUTE_SRTE;
break;
case RTPROT_UNSPEC:
case RTPROT_REDIRECT:
case RTPROT_KERNEL:
case RTPROT_BOOT:
case RTPROT_GATED:
case RTPROT_RA:
case RTPROT_MRT:
case RTPROT_BIRD:
case RTPROT_DNROUTED:
case RTPROT_XORP:
case RTPROT_NTK:
case RTPROT_MROUTED:
case RTPROT_KEEPALIVED:
case RTPROT_OPENR:
proto = ZEBRA_ROUTE_KERNEL;
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",
__func__, proto);
proto = ZEBRA_ROUTE_KERNEL;
break;
}
return proto;
}
/**
* @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;
}
/**
* @parse_encap_seg6local_flavors() - Parses encapsulated SRv6 flavors
* attributes
* @tb: Pointer to rtattr to look for nested items in.
* @flv: Pointer to store SRv6 flavors info in.
*
* Return: 0 on success, non-zero on error
*/
static int parse_encap_seg6local_flavors(struct rtattr *tb,
struct seg6local_flavors_info *flv)
{
struct rtattr *tb_encap[SEG6_LOCAL_FLV_MAX + 1] = {};
netlink_parse_rtattr_nested(tb_encap, SEG6_LOCAL_FLV_MAX, tb);
if (tb_encap[SEG6_LOCAL_FLV_OPERATION])
flv->flv_ops = *(uint32_t *)RTA_DATA(
tb_encap[SEG6_LOCAL_FLV_OPERATION]);
if (tb_encap[SEG6_LOCAL_FLV_LCBLOCK_BITS])
flv->lcblock_len = *(uint8_t *)RTA_DATA(
tb_encap[SEG6_LOCAL_FLV_LCBLOCK_BITS]);
if (tb_encap[SEG6_LOCAL_FLV_LCNODE_FN_BITS])
flv->lcnode_func_len = *(uint8_t *)RTA_DATA(
tb_encap[SEG6_LOCAL_FLV_LCNODE_FN_BITS]);
return 0;
}
static enum seg6local_action_t
parse_encap_seg6local(struct rtattr *tb,
struct seg6local_context *ctx)
{
struct rtattr *tb_encap[SEG6_LOCAL_MAX + 1] = {};
enum seg6local_action_t act = ZEBRA_SEG6_LOCAL_ACTION_UNSPEC;
netlink_parse_rtattr_nested(tb_encap, SEG6_LOCAL_MAX, tb);
if (tb_encap[SEG6_LOCAL_ACTION])
act = *(uint32_t *)RTA_DATA(tb_encap[SEG6_LOCAL_ACTION]);
if (tb_encap[SEG6_LOCAL_NH4])
ctx->nh4 = *(struct in_addr *)RTA_DATA(
tb_encap[SEG6_LOCAL_NH4]);
if (tb_encap[SEG6_LOCAL_NH6])
ctx->nh6 = *(struct in6_addr *)RTA_DATA(
tb_encap[SEG6_LOCAL_NH6]);
if (tb_encap[SEG6_LOCAL_TABLE])
ctx->table = *(uint32_t *)RTA_DATA(tb_encap[SEG6_LOCAL_TABLE]);
if (tb_encap[SEG6_LOCAL_VRFTABLE])
ctx->table =
*(uint32_t *)RTA_DATA(tb_encap[SEG6_LOCAL_VRFTABLE]);
if (tb_encap[SEG6_LOCAL_FLAVORS]) {
parse_encap_seg6local_flavors(tb_encap[SEG6_LOCAL_FLAVORS],
&ctx->flv);
}
return act;
}
static int parse_encap_seg6(struct rtattr *tb, struct in6_addr *segs)
{
struct rtattr *tb_encap[SEG6_IPTUNNEL_MAX + 1] = {};
struct seg6_iptunnel_encap *ipt = NULL;
struct in6_addr *segments = NULL;
netlink_parse_rtattr_nested(tb_encap, SEG6_IPTUNNEL_MAX, tb);
/*
* TODO: It's not support multiple SID list.
*/
if (tb_encap[SEG6_IPTUNNEL_SRH]) {
ipt = (struct seg6_iptunnel_encap *)
RTA_DATA(tb_encap[SEG6_IPTUNNEL_SRH]);
segments = ipt->srh[0].segments;
*segs = segments[0];
return 1;
}
return 0;
}
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;
enum seg6local_action_t seg6l_act = ZEBRA_SEG6_LOCAL_ACTION_UNSPEC;
struct seg6local_context seg6l_ctx = {};
struct in6_addr seg6_segs = {};
int num_segs = 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->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 (tb[RTA_ENCAP] && tb[RTA_ENCAP_TYPE]
&& *(uint16_t *)RTA_DATA(tb[RTA_ENCAP_TYPE])
== LWTUNNEL_ENCAP_SEG6_LOCAL) {
seg6l_act = parse_encap_seg6local(tb[RTA_ENCAP], &seg6l_ctx);
}
if (tb[RTA_ENCAP] && tb[RTA_ENCAP_TYPE]
&& *(uint16_t *)RTA_DATA(tb[RTA_ENCAP_TYPE])
== LWTUNNEL_ENCAP_SEG6) {
num_segs = parse_encap_seg6(tb[RTA_ENCAP], &seg6_segs);
}
if (rtm->rtm_flags & RTNH_F_ONLINK)
SET_FLAG(nh.flags, NEXTHOP_FLAG_ONLINK);
if (rtm->rtm_flags & RTNH_F_LINKDOWN)
SET_FLAG(nh.flags, NEXTHOP_FLAG_LINKDOWN);
if (num_labels)
nexthop_add_labels(&nh, ZEBRA_LSP_STATIC, num_labels, labels);
/* Resolve default values for SRv6 flavors */
if (seg6l_ctx.flv.flv_ops != ZEBRA_SEG6_LOCAL_FLV_OP_UNSPEC) {
if (seg6l_ctx.flv.lcblock_len == 0)
seg6l_ctx.flv.lcblock_len =
ZEBRA_DEFAULT_SEG6_LOCAL_FLV_LCBLOCK_LEN;
if (seg6l_ctx.flv.lcnode_func_len == 0)
seg6l_ctx.flv.lcnode_func_len =
ZEBRA_DEFAULT_SEG6_LOCAL_FLV_LCNODE_FN_LEN;
}
if (seg6l_act != ZEBRA_SEG6_LOCAL_ACTION_UNSPEC)
nexthop_add_srv6_seg6local(&nh, seg6l_act, &seg6l_ctx);
if (num_segs)
nexthop_add_srv6_seg6(&nh, &seg6_segs);
return nh;
}
static uint8_t parse_multipath_nexthops_unicast(ns_id_t ns_id,
struct nexthop_group *ng,
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;
enum seg6local_action_t seg6l_act = ZEBRA_SEG6_LOCAL_ACTION_UNSPEC;
struct seg6local_context seg6l_ctx = {};
struct in6_addr seg6_segs = {};
int num_segs = 0;
struct rtattr *rtnh_tb[RTA_MAX + 1] = {};
int len = RTA_PAYLOAD(tb[RTA_MULTIPATH]);
vrf_id_t nh_vrf_id = vrf_id;
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->vrf_id;
else {
flog_warn(
EC_ZEBRA_UNKNOWN_INTERFACE,
"%s: Unknown interface %u specified, defaulting to VRF_DEFAULT",
__func__, index);
nh_vrf_id = VRF_DEFAULT;
}
} else
nh_vrf_id = vrf_id;
if (rtnh->rtnh_len > sizeof(*rtnh)) {
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 (rtnh_tb[RTA_ENCAP] && rtnh_tb[RTA_ENCAP_TYPE]
&& *(uint16_t *)RTA_DATA(rtnh_tb[RTA_ENCAP_TYPE])
== LWTUNNEL_ENCAP_SEG6_LOCAL) {
seg6l_act = parse_encap_seg6local(
rtnh_tb[RTA_ENCAP], &seg6l_ctx);
}
if (rtnh_tb[RTA_ENCAP] && rtnh_tb[RTA_ENCAP_TYPE]
&& *(uint16_t *)RTA_DATA(rtnh_tb[RTA_ENCAP_TYPE])
== LWTUNNEL_ENCAP_SEG6) {
num_segs = parse_encap_seg6(rtnh_tb[RTA_ENCAP],
&seg6_segs);
}
}
if (gate && rtm->rtm_family == AF_INET) {
if (index)
nh = nexthop_from_ipv4_ifindex(
gate, prefsrc, index, nh_vrf_id);
else
nh = nexthop_from_ipv4(gate, prefsrc,
nh_vrf_id);
} else if (gate && rtm->rtm_family == AF_INET6) {
if (index)
nh = nexthop_from_ipv6_ifindex(
gate, index, nh_vrf_id);
else
nh = nexthop_from_ipv6(gate, nh_vrf_id);
} else
nh = nexthop_from_ifindex(index, nh_vrf_id);
if (nh) {
nh->weight = rtnh->rtnh_hops + 1;
if (num_labels)
nexthop_add_labels(nh, ZEBRA_LSP_STATIC,
num_labels, labels);
if (seg6l_act != ZEBRA_SEG6_LOCAL_ACTION_UNSPEC)
nexthop_add_srv6_seg6local(nh, seg6l_act,
&seg6l_ctx);
if (num_segs)
nexthop_add_srv6_seg6(nh, &seg6_segs);
if (rtnh->rtnh_flags & RTNH_F_ONLINK)
SET_FLAG(nh->flags, NEXTHOP_FLAG_ONLINK);
/* Add to temporary list */
nexthop_group_add_sorted(ng, nh);
}
if (rtnh->rtnh_len == 0)
break;
len -= NLMSG_ALIGN(rtnh->rtnh_len);
rtnh = RTNH_NEXT(rtnh);
}
uint8_t nhop_num = nexthop_group_nexthop_num(ng);
return nhop_num;
}
/* Looking up routing table by netlink interface. */
int netlink_route_change_read_unicast_internal(struct nlmsghdr *h,
ns_id_t ns_id, int startup,
struct zebra_dplane_ctx *ctx)
{
int len;
struct rtmsg *rtm;
struct rtattr *tb[RTA_MAX + 1];
uint32_t flags = 0;
struct prefix p;
struct prefix_ipv6 src_p = {};
vrf_id_t vrf_id;
bool selfroute;
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;
frrtrace(3, frr_zebra, netlink_route_change_read_unicast, h, ns_id,
startup);
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",
__func__, h->nlmsg_len,
(size_t)NLMSG_LENGTH(sizeof(struct rtmsg)));
return -1;
}
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;
selfroute = is_selfroute(rtm->rtm_protocol);
if (!startup && selfroute && h->nlmsg_type == RTM_NEWROUTE &&
!zrouter.asic_offloaded && !ctx) {
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 = zebra_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;
}
if (rtm->rtm_flags & RTM_F_TRAP)
flags |= ZEBRA_FLAG_TRAPPED;
if (rtm->rtm_flags & RTM_F_OFFLOAD)
flags |= ZEBRA_FLAG_OFFLOADED;
if (rtm->rtm_flags & RTM_F_OFFLOAD_FAILED)
flags |= ZEBRA_FLAG_OFFLOAD_FAILED;
if (h->nlmsg_flags & NLM_F_APPEND)
flags |= ZEBRA_FLAG_OUTOFSYNC;
/* Route which inserted by Zebra. */
if (selfroute) {
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];
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) {
flog_warn(
EC_ZEBRA_UNSUPPORTED_V4_SRCDEST,
"unsupported IPv4 sourcedest route (dest %pFX vrf %u)",
&p, 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;
} else {
/* We only handle the AFs we handle... */
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: unknown address-family %u", __func__,
rtm->rtm_family);
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 buf2[PREFIX_STRLEN];
zlog_debug(
"%s %pFX%s%s vrf %s(%u) table_id: %u metric: %d Admin Distance: %d",
nl_msg_type_to_str(h->nlmsg_type), &p,
src_p.prefixlen ? " from " : "",
src_p.prefixlen ? prefix2str(&src_p, buf2, sizeof(buf2))
: "",
vrf_id_to_name(vrf_id), 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 route_entry *re;
struct nexthop_group *ng = NULL;
re = zebra_rib_route_entry_new(vrf_id, proto, 0, flags, nhe_id,
table, metric, mtu, distance,
tag);
if (!nhe_id)
ng = nexthop_group_new();
if (!tb[RTA_MULTIPATH]) {
struct nexthop *nexthop, nh;
if (!nhe_id) {
nh = parse_nexthop_unicast(
ns_id, rtm, tb, bh_type, index, prefsrc,
gate, afi, vrf_id);
nexthop = nexthop_new();
*nexthop = nh;
nexthop_group_add_sorted(ng, nexthop);
}
} else {
/* This is a multipath route */
struct rtnexthop *rtnh =
(struct rtnexthop *)RTA_DATA(tb[RTA_MULTIPATH]);
if (!nhe_id) {
uint8_t nhop_num;
/* Use temporary list of nexthops; parse
* message payload's nexthops.
*/
nhop_num =
parse_multipath_nexthops_unicast(
ns_id, ng, rtm, rtnh, tb,
prefsrc, vrf_id);
zserv_nexthop_num_warn(
__func__, (const struct prefix *)&p,