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Switchoff for MPLS in kernel.

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This commit is contained in:
Maria Jan Matejka 2017-09-25 13:00:05 +02:00 committed by Ondrej Zajicek (work)
parent 67a2eb9177
commit 6b0f5f68a8
5 changed files with 106 additions and 82 deletions
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35
aclocal.m4 vendored
View file

@ -31,6 +31,41 @@ AC_DEFUN([BIRD_CHECK_PTHREADS],
CFLAGS="$bird_tmp_cflags"
])
AC_DEFUN([BIRD_CHECK_MPLS_KERNEL],
[
AC_CACHE_CHECK(
[for Linux MPLS headers],
[bird_cv_mpls_kernel],
[
AC_COMPILE_IFELSE(
[
AC_LANG_PROGRAM(
[
#include <linux/lwtunnel.h>
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#include <sys/socket.h>
void t(int arg);
],
[
t(AF_MPLS);
t(RTA_VIA);
t(RTA_NEWDST);
t(RTA_ENCAP_TYPE);
t(RTA_ENCAP);
struct rtvia rtvia;
t(LWTUNNEL_ENCAP_MPLS);
]
)
],
[bird_cv_mpls_kernel=yes],
[bird_cv_mpls_kernel=no]
)
]
)
])
AC_DEFUN([BIRD_CHECK_GCC_OPTION],
[
bird_tmp_cflags="$CFLAGS"

33
configure.ac
View file

@ -36,6 +36,12 @@ AC_ARG_ENABLE([libssh],
[enable_libssh=try]
)
AC_ARG_ENABLE([mpls-kernel],
[AS_HELP_STRING([--enable-mpls-kernel], [enable MPLS support in kernel protocol @<:@try@:>@])],
[],
[enable_mpls_kernel=try]
)
AC_ARG_WITH([protocols],
[AS_HELP_STRING([--with-protocols=LIST], [include specified routing protocols @<:@all@:>@])],
[],
@ -239,6 +245,20 @@ if test "$enable_libssh" != no ; then
fi
fi
if test "$enable_mpls_kernel" != no ; then
BIRD_CHECK_MPLS_KERNEL
if test "$bird_cv_mpls_kernel" = yes ; then
AC_DEFINE([HAVE_MPLS_KERNEL], [1], [Define to 1 if kernel is MPLS capable])
elif test "$enable_mpls_kernel" = yes ; then
AC_MSG_ERROR([Kernel MPLS support not found.])
fi
if test "$enable_mpls_kernel" = try ; then
enable_mpls_kernel="$bird_cv_mpls_kernel"
fi
fi
all_protocols="$proto_bfd babel bgp ospf pipe radv rip $proto_rpki static"
all_protocols=`echo $all_protocols | sed 's/ /,/g'`
@ -287,18 +307,6 @@ esac
AC_CHECK_HEADERS_ONCE([alloca.h syslog.h])
AC_CHECK_MEMBERS([struct sockaddr.sa_len], [], [], [#include <sys/socket.h>])
AC_CHECK_HEADERS([linux/lwtunnel.h],
[AC_DEFINE([HAVE_LWTUNNEL], [1], [Define to 1 if you have the <linux/lwtunnel.h> header file.])],
[],
[] dnl Force new AC_CHECK_HEADER semantics
)
AC_CHECK_MEMBERS([struct rtvia.rtvia_family],
[AC_DEFINE([HAVE_STRUCT_RTVIA], [1], [Define to 1 if you have rtvia structure.])],
[],
[#include <linux/rtnetlink.h>]
)
AC_C_BIGENDIAN(
[AC_DEFINE([CPU_BIG_ENDIAN], [1], [Define to 1 if cpu is big endian])],
[AC_DEFINE([CPU_LITTLE_ENDIAN], [1], [Define to 1 if cpu is little endian])],
@ -396,6 +404,7 @@ AC_MSG_RESULT([ System configuration: $sysdesc])
AC_MSG_RESULT([ Debugging: $enable_debug])
AC_MSG_RESULT([ POSIX threads: $enable_pthreads])
AC_MSG_RESULT([ Routing protocols: $protocols])
AC_MSG_RESULT([ Kernel MPLS support: $enable_mpls_kernel])
AC_MSG_RESULT([ Client: $enable_client])
rm -f $objdir/.*-stamp

45
sysdep/linux/lwtunnel.h
View file

@ -1,45 +0,0 @@
#ifndef _LWTUNNEL_H_
#define _LWTUNNEL_H_
#include <linux/types.h>
enum lwtunnel_encap_types {
LWTUNNEL_ENCAP_NONE,
LWTUNNEL_ENCAP_MPLS,
LWTUNNEL_ENCAP_IP,
LWTUNNEL_ENCAP_ILA,
LWTUNNEL_ENCAP_IP6,
__LWTUNNEL_ENCAP_MAX,
};
#define LWTUNNEL_ENCAP_MAX (__LWTUNNEL_ENCAP_MAX - 1)
enum lwtunnel_ip_t {
LWTUNNEL_IP_UNSPEC,
LWTUNNEL_IP_ID,
LWTUNNEL_IP_DST,
LWTUNNEL_IP_SRC,
LWTUNNEL_IP_TTL,
LWTUNNEL_IP_TOS,
LWTUNNEL_IP_FLAGS,
LWTUNNEL_IP_PAD,
__LWTUNNEL_IP_MAX,
};
#define LWTUNNEL_IP_MAX (__LWTUNNEL_IP_MAX - 1)
enum lwtunnel_ip6_t {
LWTUNNEL_IP6_UNSPEC,
LWTUNNEL_IP6_ID,
LWTUNNEL_IP6_DST,
LWTUNNEL_IP6_SRC,
LWTUNNEL_IP6_HOPLIMIT,
LWTUNNEL_IP6_TC,
LWTUNNEL_IP6_FLAGS,
LWTUNNEL_IP6_PAD,
__LWTUNNEL_IP6_MAX,
};
#define LWTUNNEL_IP6_MAX (__LWTUNNEL_IP6_MAX - 1)
#endif /* _LWTUNNEL_H_ */

71
sysdep/linux/netlink.c
View file

@ -30,14 +30,12 @@
#include <asm/types.h>
#include <linux/if.h>
#ifdef HAVE_LWTUNNEL
#include <linux/lwtunnel.h>
#else
#include "sysdep/linux/lwtunnel.h"
#endif
#include <linux/netlink.h>
#include <linux/rtnetlink.h>
#ifdef HAVE_MPLS_KERNEL
#include <linux/lwtunnel.h>
#endif
#ifndef MSG_TRUNC /* Hack: Several versions of glibc miss this one :( */
#define MSG_TRUNC 0x20
@ -59,13 +57,6 @@
#define RTA_VIA 18
#endif
#ifndef HAVE_STRUCT_RTVIA
struct rtvia {
unsigned short rtvia_family;
u8 rtvia_addr[0];
};
#endif
#ifndef RTA_NEWDST
#define RTA_NEWDST 19
#endif
@ -361,9 +352,11 @@ static struct nl_want_attrs nexthop_attr_want6[BIRD_RTA_MAX] = {
[RTA_ENCAP] = { 1, 0, 0 },
};
#ifdef HAVE_MPLS_KERNEL
static struct nl_want_attrs encap_mpls_want[BIRD_RTA_MAX] = {
[RTA_DST] = { 1, 0, 0 },
};
#endif
static struct nl_want_attrs rtm_attr_want4[BIRD_RTA_MAX] = {
[RTA_DST] = { 1, 1, sizeof(ip4_addr) },
@ -394,6 +387,7 @@ static struct nl_want_attrs rtm_attr_want6[BIRD_RTA_MAX] = {
[RTA_ENCAP] = { 1, 0, 0 },
};
#ifdef HAVE_MPLS_KERNEL
static struct nl_want_attrs rtm_attr_want_mpls[BIRD_RTA_MAX] = {
[RTA_DST] = { 1, 1, sizeof(u32) },
[RTA_IIF] = { 1, 1, sizeof(u32) },
@ -405,6 +399,7 @@ static struct nl_want_attrs rtm_attr_want_mpls[BIRD_RTA_MAX] = {
[RTA_VIA] = { 1, 0, 0 },
[RTA_NEWDST] = { 1, 0, 0 },
};
#endif
static int
@ -456,6 +451,7 @@ static inline ip_addr rta_get_ipa(struct rtattr *a)
return ipa_from_ip6(rta_get_ip6(a));
}
#ifdef HAVE_MPLS_KERNEL
static inline ip_addr rta_get_via(struct rtattr *a)
{
struct rtvia *v = RTA_DATA(a);
@ -474,6 +470,7 @@ static inline int rta_get_mpls(struct rtattr *a, u32 *stack)
return mpls_get(RTA_DATA(a), RTA_PAYLOAD(a) & ~0x3, stack);
}
#endif
struct rtattr *
nl_add_attr(struct nlmsghdr *h, uint bufsize, uint code, const void *data, uint dlen)
@ -542,6 +539,7 @@ nl_add_attr_ipa(struct nlmsghdr *h, uint bufsize, int code, ip_addr ipa)
nl_add_attr_ip6(h, bufsize, code, ipa_to_ip6(ipa));
}
#ifdef HAVE_MPLS_KERNEL
static inline void
nl_add_attr_mpls(struct nlmsghdr *h, uint bufsize, int code, int len, u32 *stack)
{
@ -583,6 +581,7 @@ nl_add_attr_via(struct nlmsghdr *h, uint bufsize, ip_addr ipa)
nl_close_attr(h, nest);
}
#endif
static inline struct rtnexthop *
nl_open_nexthop(struct nlmsghdr *h, uint bufsize)
@ -605,8 +604,9 @@ nl_close_nexthop(struct nlmsghdr *h, struct rtnexthop *nh)
}
static inline void
nl_add_nexthop(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af)
nl_add_nexthop(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af UNUSED)
{
#ifdef HAVE_MPLS_KERNEL
if (nh->labels > 0)
if (af == AF_MPLS)
nl_add_attr_mpls(h, bufsize, RTA_NEWDST, nh->labels, nh->label);
@ -618,6 +618,11 @@ nl_add_nexthop(struct nlmsghdr *h, uint bufsize, struct nexthop *nh, int af)
nl_add_attr_via(h, bufsize, nh->gw);
else
nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw);
#else
if (ipa_nonzero(nh->gw))
nl_add_attr_ipa(h, bufsize, RTA_GATEWAY, nh->gw);
#endif
}
static void
@ -716,20 +721,22 @@ nl_parse_multipath(struct krt_proto *p, struct rtattr *ra, int af)
else
rv->gw = IPA_NONE;
#ifdef HAVE_MPLS_KERNEL
if (a[RTA_ENCAP_TYPE])
{
if (rta_get_u16(a[RTA_ENCAP_TYPE]) != LWTUNNEL_ENCAP_MPLS) {
log(L_WARN "KRT: Unknown encapsulation method %d in multipath", rta_get_u16(a[RTA_ENCAP_TYPE]));
return NULL;
}
struct rtattr *enca[BIRD_RTA_MAX];
nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]);
nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca));
rv->labels = rta_get_mpls(enca[RTA_DST], rv->label);
break;
{
if (rta_get_u16(a[RTA_ENCAP_TYPE]) != LWTUNNEL_ENCAP_MPLS) {
log(L_WARN "KRT: Unknown encapsulation method %d in multipath", rta_get_u16(a[RTA_ENCAP_TYPE]));
return NULL;
}
struct rtattr *enca[BIRD_RTA_MAX];
nl_attr_len = RTA_PAYLOAD(a[RTA_ENCAP]);
nl_parse_attrs(RTA_DATA(a[RTA_ENCAP]), encap_mpls_want, enca, sizeof(enca));
rv->labels = rta_get_mpls(enca[RTA_DST], rv->label);
break;
}
#endif
len -= NLMSG_ALIGN(nh->rtnh_len);
nh = RTNH_NEXT(nh);
@ -1216,12 +1223,14 @@ nl_send_route(struct krt_proto *p, rte *e, struct ea_list *eattrs, int op, int d
r->r.rtm_dst_len = net_pxlen(net->n.addr);
r->r.rtm_protocol = RTPROT_BIRD;
r->r.rtm_scope = RT_SCOPE_NOWHERE;
#ifdef HAVE_MPLS_KERNEL
if (p->af == AF_MPLS)
{
u32 label = net_mpls(net->n.addr);
nl_add_attr_mpls(&r->h, rsize, RTA_DST, 1, &label);
}
else
#endif
nl_add_attr_ipa(&r->h, rsize, RTA_DST, net_prefix(net->n.addr));
/*
@ -1490,6 +1499,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
net_fill_ip6(&dst, IP6_NONE, 0);
break;
#ifdef HAVE_MPLS_KERNEL
case AF_MPLS:
if (!nl_parse_attrs(RTM_RTA(i), rtm_attr_want_mpls, a, sizeof(a)))
return;
@ -1502,6 +1512,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
net_fill_mpls(&dst, rta_mpls_stack[0]);
break;
#endif
default:
return;
@ -1595,11 +1606,17 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
return;
}
if ((i->rtm_family != AF_MPLS) && a[RTA_GATEWAY] || (i->rtm_family == AF_MPLS) && a[RTA_VIA])
if ((i->rtm_family != AF_MPLS) && a[RTA_GATEWAY]
#ifdef HAVE_MPLS_KERNEL
|| (i->rtm_family == AF_MPLS) && a[RTA_VIA]
#endif
)
{
#ifdef HAVE_MPLS_KERNEL
if (i->rtm_family == AF_MPLS)
ra->nh.gw = rta_get_via(a[RTA_VIA]);
else
#endif
ra->nh.gw = rta_get_ipa(a[RTA_GATEWAY]);
/* Silently skip strange 6to4 routes */
@ -1637,6 +1654,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
return;
}
#ifdef HAVE_MPLS_KERNEL
int labels = 0;
if ((i->rtm_family == AF_MPLS) && a[RTA_NEWDST] && !ra->nh.next)
labels = rta_get_mpls(a[RTA_NEWDST], ra->nh.label);
@ -1666,6 +1684,7 @@ nl_parse_route(struct nl_parse_state *s, struct nlmsghdr *h)
}
else
ra->nh.labels = labels;
#endif
rte *e = rte_get_temp(ra);
e->net = net;
@ -1816,6 +1835,7 @@ krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NUL
log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
nl_parse_end(&s);
#ifdef HAVE_MPLS_KERNEL
nl_parse_begin(&s, 1, 1);
nl_request_dump(AF_MPLS, RTM_GETROUTE);
while (h = nl_get_scan())
@ -1824,6 +1844,7 @@ krt_do_scan(struct krt_proto *p UNUSED) /* CONFIG_ALL_TABLES_AT_ONCE => p is NUL
else
log(L_DEBUG "nl_scan_fire: Unknown packet received (type=%d)", h->nlmsg_type);
nl_parse_end(&s);
#endif
}
/*

4
sysdep/unix/krt.c
View file

@ -1211,7 +1211,11 @@ struct protocol proto_unix_kernel = {
.template = "kernel%d",
.attr_class = EAP_KRT,
.preference = DEF_PREF_INHERITED,
#ifdef HAVE_MPLS_KERNEL
.channel_mask = NB_IP | NB_MPLS,
#else
.channel_mask = NB_IP,
#endif
.proto_size = sizeof(struct krt_proto),
.config_size = sizeof(struct krt_config),
.preconfig = krt_preconfig,