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mirror_frr/zebra/kernel_socket.c
Donald Sharp f19435a8b4 zebra: Pay attention to metric from kernel 
When the linux kernel adds/deletes routes, the
metric is important, but our routing protocols
add/delete in a slightly different manner,
so allow kernel metrics to match so that our
rib matches the kernel's fib.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
2017-08-09 09:17:20 -04:00

1385 lines
40 KiB
C
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/* Kernel communication using routing socket.
* Copyright (C) 1999 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>
#ifndef HAVE_NETLINK
#include <net/if_types.h>
#ifdef __OpenBSD__
#include <netmpls/mpls.h>
#endif
#include "if.h"
#include "prefix.h"
#include "sockunion.h"
#include "connected.h"
#include "memory.h"
#include "zebra_memory.h"
#include "ioctl.h"
#include "log.h"
#include "table.h"
#include "rib.h"
#include "privs.h"
#include "vrf.h"
#include "zebra/interface.h"
#include "zebra/zserv.h"
#include "zebra/debug.h"
#include "zebra/kernel_socket.h"
#include "zebra/rib.h"
extern struct zebra_privs_t zserv_privs;
/*
* Historically, the BSD routing socket has aligned data following a
* struct sockaddr to sizeof(long), which was 4 bytes on some
* platforms, and 8 bytes on others. NetBSD 6 changed the routing
* socket to align to sizeof(uint64_t), which is 8 bytes. OS X
* appears to align to sizeof(int), which is 4 bytes.
*
* Alignment of zero-sized sockaddrs is nonsensical, but historically
* BSD defines RT_ROUNDUP(0) to be the alignment interval (rather than
* 0). We follow this practice without questioning it, but it is a
* bug if quagga calls ROUNDUP with 0.
*/
/*
* Because of these varying conventions, the only sane approach is for
* the <net/route.h> header to define some flavor of ROUNDUP macro.
*/
#if defined(SA_SIZE)
/* SAROUNDUP is the only thing we need, and SA_SIZE provides that */
#define SAROUNDUP(a) SA_SIZE(a)
#else /* !SA_SIZE */
#if defined(RT_ROUNDUP)
#define ROUNDUP(a) RT_ROUNDUP(a)
#endif /* defined(RT_ROUNDUP) */
#if defined(SUNOS_5)
/* Solaris has struct sockaddr_in[6] definitions at 16 / 32 bytes size,
* so the whole concept doesn't really apply. */
#define ROUNDUP(a) (a)
#endif
/*
* If ROUNDUP has not yet been defined in terms of platform-provided
* defines, attempt to cope with heuristics.
*/
#if !defined(ROUNDUP)
/*
* It's a bug for a platform not to define rounding/alignment for
* sockaddrs on the routing socket. This warning really is
* intentional, to provoke filing bug reports with operating systems
* that don't define RT_ROUNDUP or equivalent.
*/
#warning \
"net/route.h does not define RT_ROUNDUP; making unwarranted assumptions!"
/* OS X (Xcode as of 2014-12) is known not to define RT_ROUNDUP */
#ifdef __APPLE__
#define ROUNDUP_TYPE int
#else
#define ROUNDUP_TYPE long
#endif
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a)-1) | (sizeof(ROUNDUP_TYPE) - 1))) \
: sizeof(ROUNDUP_TYPE))
#endif /* defined(ROUNDUP) */
/*
* Given a pointer (sockaddr or void *), return the number of bytes
* taken up by the sockaddr and any padding needed for alignment.
*/
#if defined(HAVE_STRUCT_SOCKADDR_SA_LEN)
#define SAROUNDUP(X) ROUNDUP(((struct sockaddr *)(X))->sa_len)
#else
/*
* One would hope all fixed-size structure definitions are aligned,
* but round them up nonetheless.
*/
#define SAROUNDUP(X) \
(((struct sockaddr *)(X))->sa_family == AF_INET \
? ROUNDUP(sizeof(struct sockaddr_in)) \
: (((struct sockaddr *)(X))->sa_family == AF_INET6 \
? ROUNDUP(sizeof(struct sockaddr_in6)) \
: (((struct sockaddr *)(X))->sa_family == AF_LINK \
? ROUNDUP(sizeof(struct sockaddr_dl)) \
: sizeof(struct sockaddr))))
#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
#endif /* !SA_SIZE */
/*
* We use a call to an inline function to copy (PNT) to (DEST)
* 1. Calculating the length of the copy requires an #ifdef to determine
* if sa_len is a field and can't be used directly inside a #define
* 2. So the compiler doesn't complain when DEST is NULL, which is only true
* when we are skipping the copy and incrementing to the next SA
*/
static inline void rta_copy(union sockunion *dest, caddr_t src)
{
int len;
if (!dest)
return;
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
len = (((struct sockaddr *)src)->sa_len > sizeof(*dest))
? sizeof(*dest)
: ((struct sockaddr *)src)->sa_len;
#else
len = (SAROUNDUP(src) > sizeof(*dest)) ? sizeof(*dest) : SAROUNDUP(src);
#endif
memcpy(dest, src, len);
}
#define RTA_ADDR_GET(DEST, RTA, RTMADDRS, PNT) \
if ((RTMADDRS) & (RTA)) { \
int len = SAROUNDUP((PNT)); \
if (af_check(((struct sockaddr *)(PNT))->sa_family)) \
rta_copy((DEST), (PNT)); \
(PNT) += len; \
}
#define RTA_ATTR_GET(DEST, RTA, RTMADDRS, PNT) \
if ((RTMADDRS) & (RTA)) { \
int len = SAROUNDUP((PNT)); \
rta_copy((DEST), (PNT)); \
(PNT) += len; \
}
#define RTA_NAME_GET(DEST, RTA, RTMADDRS, PNT, LEN) \
if ((RTMADDRS) & (RTA)) { \
u_char *pdest = (u_char *)(DEST); \
int len = SAROUNDUP((PNT)); \
struct sockaddr_dl *sdl = (struct sockaddr_dl *)(PNT); \
if (IS_ZEBRA_DEBUG_KERNEL) \
zlog_debug("%s: RTA_SDL_GET nlen %d, alen %d", \
__func__, sdl->sdl_nlen, sdl->sdl_alen); \
if (((DEST) != NULL) && (sdl->sdl_family == AF_LINK) \
&& (sdl->sdl_nlen < IFNAMSIZ) && (sdl->sdl_nlen <= len)) { \
memcpy(pdest, sdl->sdl_data, sdl->sdl_nlen); \
pdest[sdl->sdl_nlen] = '\0'; \
(LEN) = sdl->sdl_nlen; \
} \
(PNT) += len; \
} else { \
(LEN) = 0; \
}
/* Routing socket message types. */
const struct message rtm_type_str[] = {{RTM_ADD, "RTM_ADD"},
{RTM_DELETE, "RTM_DELETE"},
{RTM_CHANGE, "RTM_CHANGE"},
{RTM_GET, "RTM_GET"},
{RTM_LOSING, "RTM_LOSING"},
{RTM_REDIRECT, "RTM_REDIRECT"},
{RTM_MISS, "RTM_MISS"},
{RTM_LOCK, "RTM_LOCK"},
#ifdef OLDADD
{RTM_OLDADD, "RTM_OLDADD"},
#endif /* RTM_OLDADD */
#ifdef RTM_OLDDEL
{RTM_OLDDEL, "RTM_OLDDEL"},
#endif /* RTM_OLDDEL */
{RTM_RESOLVE, "RTM_RESOLVE"},
{RTM_NEWADDR, "RTM_NEWADDR"},
{RTM_DELADDR, "RTM_DELADDR"},
{RTM_IFINFO, "RTM_IFINFO"},
#ifdef RTM_OIFINFO
{RTM_OIFINFO, "RTM_OIFINFO"},
#endif /* RTM_OIFINFO */
#ifdef RTM_NEWMADDR
{RTM_NEWMADDR, "RTM_NEWMADDR"},
#endif /* RTM_NEWMADDR */
#ifdef RTM_DELMADDR
{RTM_DELMADDR, "RTM_DELMADDR"},
#endif /* RTM_DELMADDR */
#ifdef RTM_IFANNOUNCE
{RTM_IFANNOUNCE, "RTM_IFANNOUNCE"},
#endif /* RTM_IFANNOUNCE */
{0}};
static const struct message rtm_flag_str[] = {{RTF_UP, "UP"},
{RTF_GATEWAY, "GATEWAY"},
{RTF_HOST, "HOST"},
{RTF_REJECT, "REJECT"},
{RTF_DYNAMIC, "DYNAMIC"},
{RTF_MODIFIED, "MODIFIED"},
{RTF_DONE, "DONE"},
#ifdef RTF_MASK
{RTF_MASK, "MASK"},
#endif /* RTF_MASK */
#ifdef RTF_CLONING
{RTF_CLONING, "CLONING"},
#endif /* RTF_CLONING */
#ifdef RTF_XRESOLVE
{RTF_XRESOLVE, "XRESOLVE"},
#endif /* RTF_XRESOLVE */
#ifdef RTF_LLINFO
{RTF_LLINFO, "LLINFO"},
#endif /* RTF_LLINFO */
{RTF_STATIC, "STATIC"},
{RTF_BLACKHOLE, "BLACKHOLE"},
#ifdef RTF_PRIVATE
{RTF_PRIVATE, "PRIVATE"},
#endif /* RTF_PRIVATE */
{RTF_PROTO1, "PROTO1"},
{RTF_PROTO2, "PROTO2"},
#ifdef RTF_PRCLONING
{RTF_PRCLONING, "PRCLONING"},
#endif /* RTF_PRCLONING */
#ifdef RTF_WASCLONED
{RTF_WASCLONED, "WASCLONED"},
#endif /* RTF_WASCLONED */
#ifdef RTF_PROTO3
{RTF_PROTO3, "PROTO3"},
#endif /* RTF_PROTO3 */
#ifdef RTF_PINNED
{RTF_PINNED, "PINNED"},
#endif /* RTF_PINNED */
#ifdef RTF_LOCAL
{RTF_LOCAL, "LOCAL"},
#endif /* RTF_LOCAL */
#ifdef RTF_BROADCAST
{RTF_BROADCAST, "BROADCAST"},
#endif /* RTF_BROADCAST */
#ifdef RTF_MULTICAST
{RTF_MULTICAST, "MULTICAST"},
#endif /* RTF_MULTICAST */
#ifdef RTF_MULTIRT
{RTF_MULTIRT, "MULTIRT"},
#endif /* RTF_MULTIRT */
#ifdef RTF_SETSRC
{RTF_SETSRC, "SETSRC"},
#endif /* RTF_SETSRC */
{0}};
/* Kernel routing update socket. */
int routing_sock = -1;
/* Yes I'm checking ugly routing socket behavior. */
/* #define DEBUG */
/* Supported address family check. */
static inline int af_check(int family)
{
if (family == AF_INET)
return 1;
if (family == AF_INET6)
return 1;
return 0;
}
/* Dump routing table flag for debug purpose. */
static void rtm_flag_dump(int flag)
{
const struct message *mes;
static char buf[BUFSIZ];
buf[0] = '\0';
for (mes = rtm_flag_str; mes->key != 0; mes++) {
if (mes->key & flag) {
strlcat(buf, mes->str, BUFSIZ);
strlcat(buf, " ", BUFSIZ);
}
}
zlog_debug("Kernel: %s", buf);
}
#ifdef RTM_IFANNOUNCE
/* Interface adding function */
static int ifan_read(struct if_announcemsghdr *ifan)
{
struct interface *ifp;
ifp = if_lookup_by_index(ifan->ifan_index, VRF_DEFAULT);
if (ifp)
assert((ifp->ifindex == ifan->ifan_index)
|| (ifp->ifindex == IFINDEX_INTERNAL));
if ((ifp == NULL) || ((ifp->ifindex == IFINDEX_INTERNAL)
&& (ifan->ifan_what == IFAN_ARRIVAL))) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"%s: creating interface for ifindex %d, name %s",
__func__, ifan->ifan_index, ifan->ifan_name);
/* Create Interface */
ifp = if_get_by_name_len(
ifan->ifan_name,
strnlen(ifan->ifan_name, sizeof(ifan->ifan_name)),
VRF_DEFAULT, 0);
ifp->ifindex = ifan->ifan_index;
if_get_metric(ifp);
if_add_update(ifp);
} else if (ifp != NULL && ifan->ifan_what == IFAN_DEPARTURE)
if_delete_update(ifp);
if_get_flags(ifp);
if_get_mtu(ifp);
if_get_metric(ifp);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: interface %s index %d", __func__,
ifan->ifan_name, ifan->ifan_index);
return 0;
}
#endif /* RTM_IFANNOUNCE */
#ifdef HAVE_BSD_IFI_LINK_STATE
/* BSD link detect translation */
static void bsd_linkdetect_translate(struct if_msghdr *ifm)
{
if ((ifm->ifm_data.ifi_link_state >= LINK_STATE_UP)
|| (ifm->ifm_data.ifi_link_state == LINK_STATE_UNKNOWN))
SET_FLAG(ifm->ifm_flags, IFF_RUNNING);
else
UNSET_FLAG(ifm->ifm_flags, IFF_RUNNING);
}
#endif /* HAVE_BSD_IFI_LINK_STATE */
static enum zebra_link_type sdl_to_zebra_link_type(unsigned int sdlt)
{
switch (sdlt) {
case IFT_ETHER:
return ZEBRA_LLT_ETHER;
case IFT_X25:
return ZEBRA_LLT_X25;
case IFT_FDDI:
return ZEBRA_LLT_FDDI;
case IFT_PPP:
return ZEBRA_LLT_PPP;
case IFT_LOOP:
return ZEBRA_LLT_LOOPBACK;
case IFT_SLIP:
return ZEBRA_LLT_SLIP;
case IFT_ARCNET:
return ZEBRA_LLT_ARCNET;
case IFT_ATM:
return ZEBRA_LLT_ATM;
case IFT_LOCALTALK:
return ZEBRA_LLT_LOCALTLK;
case IFT_HIPPI:
return ZEBRA_LLT_HIPPI;
#ifdef IFT_IEEE1394
case IFT_IEEE1394:
return ZEBRA_LLT_IEEE1394;
#endif
default:
return ZEBRA_LLT_UNKNOWN;
}
}
/*
* Handle struct if_msghdr obtained from reading routing socket or
* sysctl (from interface_list). There may or may not be sockaddrs
* present after the header.
*/
int ifm_read(struct if_msghdr *ifm)
{
struct interface *ifp = NULL;
struct sockaddr_dl *sdl;
char ifname[IFNAMSIZ];
short ifnlen = 0;
caddr_t cp;
/* terminate ifname at head (for strnlen) and tail (for safety) */
ifname[IFNAMSIZ - 1] = '\0';
/* paranoia: sanity check structure */
if (ifm->ifm_msglen < sizeof(struct if_msghdr)) {
zlog_err("ifm_read: ifm->ifm_msglen %d too short\n",
ifm->ifm_msglen);
return -1;
}
/*
* Check for a sockaddr_dl following the message. First, point to
* where a socakddr might be if one follows the message.
*/
cp = (void *)(ifm + 1);
#ifdef SUNOS_5
/*
* XXX This behavior should be narrowed to only the kernel versions
* for which the structures returned do not match the headers.
*
* if_msghdr_t on 64 bit kernels in Solaris 9 and earlier versions
* is 12 bytes larger than the 32 bit version.
*/
if (((struct sockaddr *)cp)->sa_family == AF_UNSPEC)
cp = cp + 12;
#endif
RTA_ADDR_GET(NULL, RTA_DST, ifm->ifm_addrs, cp);
RTA_ADDR_GET(NULL, RTA_GATEWAY, ifm->ifm_addrs, cp);
RTA_ATTR_GET(NULL, RTA_NETMASK, ifm->ifm_addrs, cp);
RTA_ADDR_GET(NULL, RTA_GENMASK, ifm->ifm_addrs, cp);
sdl = (struct sockaddr_dl *)cp;
RTA_NAME_GET(ifname, RTA_IFP, ifm->ifm_addrs, cp, ifnlen);
RTA_ADDR_GET(NULL, RTA_IFA, ifm->ifm_addrs, cp);
RTA_ADDR_GET(NULL, RTA_AUTHOR, ifm->ifm_addrs, cp);
RTA_ADDR_GET(NULL, RTA_BRD, ifm->ifm_addrs, cp);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: sdl ifname %s", __func__,
(ifnlen ? ifname : "(nil)"));
/*
* Look up on ifindex first, because ifindices are the primary handle
* for
* interfaces across the user/kernel boundary, for most systems. (Some
* messages, such as up/down status changes on NetBSD, do not include a
* sockaddr_dl).
*/
if ((ifp = if_lookup_by_index(ifm->ifm_index, VRF_DEFAULT)) != NULL) {
/* we have an ifp, verify that the name matches as some systems,
* eg Solaris, have a 1:many association of ifindex:ifname
* if they dont match, we dont have the correct ifp and should
* set it back to NULL to let next check do lookup by name
*/
if (ifnlen && (strncmp(ifp->name, ifname, IFNAMSIZ) != 0)) {
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"%s: ifp name %s doesnt match sdl name %s",
__func__, ifp->name, ifname);
ifp = NULL;
}
}
/*
* If we dont have an ifp, try looking up by name. Particularly as some
* systems (Solaris) have a 1:many mapping of ifindex:ifname - the
* ifname
* is therefore our unique handle to that interface.
*
* Interfaces specified in the configuration file for which the ifindex
* has not been determined will have ifindex == IFINDEX_INTERNAL, and
* such
* interfaces are found by this search, and then their ifindex values
* can
* be filled in.
*/
if ((ifp == NULL) && ifnlen)
ifp = if_lookup_by_name(ifname, VRF_DEFAULT);
/*
* If ifp still does not exist or has an invalid index
* (IFINDEX_INTERNAL),
* create or fill in an interface.
*/
if ((ifp == NULL) || (ifp->ifindex == IFINDEX_INTERNAL)) {
/*
* To create or fill in an interface, a sockaddr_dl (via
* RTA_IFP) is required.
*/
if (!ifnlen) {
zlog_warn("Interface index %d (new) missing ifname\n",
ifm->ifm_index);
return -1;
}
#ifndef RTM_IFANNOUNCE
/* Down->Down interface should be ignored here.
* See further comment below.
*/
if (!CHECK_FLAG(ifm->ifm_flags, IFF_UP))
return 0;
#endif /* !RTM_IFANNOUNCE */
if (ifp == NULL) {
/* Interface that zebra was not previously aware of, so
* create. */
ifp = if_create(ifname, ifnlen, VRF_DEFAULT);
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: creating ifp for ifindex %d",
__func__, ifm->ifm_index);
}
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug(
"%s: updated/created ifp, ifname %s, ifindex %d",
__func__, ifp->name, ifp->ifindex);
/*
* Fill in newly created interface structure, or larval
* structure with ifindex IFINDEX_INTERNAL.
*/
ifp->ifindex = ifm->ifm_index;
#ifdef HAVE_BSD_IFI_LINK_STATE /* translate BSD kernel msg for link-state */
bsd_linkdetect_translate(ifm);
#endif /* HAVE_BSD_IFI_LINK_STATE */
if_flags_update(ifp, ifm->ifm_flags);
#if defined(__bsdi__)
if_kvm_get_mtu(ifp);
#else
if_get_mtu(ifp);
#endif /* __bsdi__ */
if_get_metric(ifp);
/*
* XXX sockaddr_dl contents can be larger than the structure
* definition. There are 2 big families here:
* - BSD has sdl_len + sdl_data[16] + overruns sdl_data
* we MUST use sdl_len here or we'll truncate data.
* - Solaris has no sdl_len, but sdl_data[244]
* presumably, it's not going to run past that, so sizeof()
* is fine here.
* a nonzero ifnlen from RTA_NAME_GET() means sdl is valid
*/
ifp->ll_type = ZEBRA_LLT_UNKNOWN;
ifp->hw_addr_len = 0;
if (ifnlen) {
#ifdef HAVE_STRUCT_SOCKADDR_DL_SDL_LEN
memcpy(&((struct zebra_if *)ifp->info)->sdl, sdl,
sdl->sdl_len);
#else
memcpy(&((struct zebra_if *)ifp->info)->sdl, sdl,
sizeof(struct sockaddr_dl));
#endif /* HAVE_STRUCT_SOCKADDR_DL_SDL_LEN */
ifp->ll_type = sdl_to_zebra_link_type(sdl->sdl_type);
if (sdl->sdl_alen <= sizeof(ifp->hw_addr)) {
memcpy(ifp->hw_addr, LLADDR(sdl),
sdl->sdl_alen);
ifp->hw_addr_len = sdl->sdl_alen;
}
}
if_add_update(ifp);
} else
/*
* Interface structure exists. Adjust stored flags from
* notification. If interface has up->down or down->up
* transition, call state change routines (to adjust routes,
* notify routing daemons, etc.). (Other flag changes are stored
* but apparently do not trigger action.)
*/
{
if (ifp->ifindex != ifm->ifm_index) {
zlog_warn(
"%s: index mismatch, ifname %s, ifp index %d, "
"ifm index %d",
__func__, ifp->name, ifp->ifindex,
ifm->ifm_index);
return -1;
}
#ifdef HAVE_BSD_IFI_LINK_STATE /* translate BSD kernel msg for link-state */
bsd_linkdetect_translate(ifm);
#endif /* HAVE_BSD_IFI_LINK_STATE */
/* update flags and handle operative->inoperative transition, if
* any */
if_flags_update(ifp, ifm->ifm_flags);
#ifndef RTM_IFANNOUNCE
if (!if_is_up(ifp)) {
/* No RTM_IFANNOUNCE on this platform, so we can never
* distinguish between ~IFF_UP and delete. We must
* presume
* it has been deleted.
* Eg, Solaris will not notify us of unplumb.
*
* XXX: Fixme - this should be runtime detected
* So that a binary compiled on a system with IFANNOUNCE
* will still behave correctly if run on a platform
* without
*/
if_delete_update(ifp);
}
#endif /* RTM_IFANNOUNCE */
if (if_is_up(ifp)) {
#if defined(__bsdi__)
if_kvm_get_mtu(ifp);
#else
if_get_mtu(ifp);
#endif /* __bsdi__ */
if_get_metric(ifp);
}
}
#ifdef HAVE_NET_RT_IFLIST
ifp->stats = ifm->ifm_data;
#endif /* HAVE_NET_RT_IFLIST */
ifp->speed = ifm->ifm_data.ifi_baudrate / 1000000;
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: interface %s index %d", __func__, ifp->name,
ifp->ifindex);
return 0;
}
/* Address read from struct ifa_msghdr. */
static void ifam_read_mesg(struct ifa_msghdr *ifm, union sockunion *addr,
union sockunion *mask, union sockunion *brd,
char *ifname, short *ifnlen)
{
caddr_t pnt, end;
union sockunion dst;
union sockunion gateway;
pnt = (caddr_t)(ifm + 1);
end = ((caddr_t)ifm) + ifm->ifam_msglen;
/* Be sure structure is cleared */
memset(mask, 0, sizeof(union sockunion));
memset(addr, 0, sizeof(union sockunion));
memset(brd, 0, sizeof(union sockunion));
memset(&dst, 0, sizeof(union sockunion));
memset(&gateway, 0, sizeof(union sockunion));
/* We fetch each socket variable into sockunion. */
RTA_ADDR_GET(&dst, RTA_DST, ifm->ifam_addrs, pnt);
RTA_ADDR_GET(&gateway, RTA_GATEWAY, ifm->ifam_addrs, pnt);
RTA_ATTR_GET(mask, RTA_NETMASK, ifm->ifam_addrs, pnt);
RTA_ADDR_GET(NULL, RTA_GENMASK, ifm->ifam_addrs, pnt);
RTA_NAME_GET(ifname, RTA_IFP, ifm->ifam_addrs, pnt, *ifnlen);
RTA_ADDR_GET(addr, RTA_IFA, ifm->ifam_addrs, pnt);
RTA_ADDR_GET(NULL, RTA_AUTHOR, ifm->ifam_addrs, pnt);
RTA_ADDR_GET(brd, RTA_BRD, ifm->ifam_addrs, pnt);
if (IS_ZEBRA_DEBUG_KERNEL) {
int family = sockunion_family(addr);
switch (family) {
case AF_INET:
case AF_INET6: {
char buf[4][INET6_ADDRSTRLEN];
zlog_debug(
"%s: ifindex %d, ifname %s, ifam_addrs 0x%x, "
"ifam_flags 0x%x, addr %s/%d broad %s dst %s "
"gateway %s",
__func__, ifm->ifam_index,
(ifnlen ? ifname : "(nil)"), ifm->ifam_addrs,
ifm->ifam_flags,
inet_ntop(family, &addr->sin.sin_addr, buf[0],
sizeof(buf[0])),
ip_masklen(mask->sin.sin_addr),
inet_ntop(family, &brd->sin.sin_addr, buf[1],
sizeof(buf[1])),
inet_ntop(family, &dst.sin.sin_addr, buf[2],
sizeof(buf[2])),
inet_ntop(family, &gateway.sin.sin_addr, buf[3],
sizeof(buf[3])));
} break;
default:
zlog_debug("%s: ifindex %d, ifname %s, ifam_addrs 0x%x",
__func__, ifm->ifam_index,
(ifnlen ? ifname : "(nil)"),
ifm->ifam_addrs);
break;
}
}
/* Assert read up end point matches to end point */
if (pnt != end)
zlog_warn("ifam_read() doesn't read all socket data");
}
/* Interface's address information get. */
int ifam_read(struct ifa_msghdr *ifam)
{
struct interface *ifp = NULL;
union sockunion addr, mask, brd;
char ifname[INTERFACE_NAMSIZ];
short ifnlen = 0;
char isalias = 0;
int flags = 0;
ifname[0] = ifname[INTERFACE_NAMSIZ - 1] = '\0';
/* Allocate and read address information. */
ifam_read_mesg(ifam, &addr, &mask, &brd, ifname, &ifnlen);
if ((ifp = if_lookup_by_index(ifam->ifam_index, VRF_DEFAULT)) == NULL) {
zlog_warn("%s: no interface for ifname %s, index %d", __func__,
ifname, ifam->ifam_index);
return -1;
}
if (ifnlen && strncmp(ifp->name, ifname, INTERFACE_NAMSIZ))
isalias = 1;
/* N.B. The info in ifa_msghdr does not tell us whether the RTA_BRD
field contains a broadcast address or a peer address, so we are
forced to
rely upon the interface type. */
if (if_is_pointopoint(ifp))
SET_FLAG(flags, ZEBRA_IFA_PEER);
#if 0
/* it might seem cute to grab the interface metric here, however
* we're processing an address update message, and so some systems
* (e.g. FBSD) dont bother to fill in ifam_metric. Disabled, but left
* in deliberately, as comment.
*/
ifp->metric = ifam->ifam_metric;
#endif
/* Add connected address. */
switch (sockunion_family(&addr)) {
case AF_INET:
if (ifam->ifam_type == RTM_NEWADDR)
connected_add_ipv4(ifp, flags, &addr.sin.sin_addr,
ip_masklen(mask.sin.sin_addr),
&brd.sin.sin_addr,
(isalias ? ifname : NULL));
else
connected_delete_ipv4(ifp, flags, &addr.sin.sin_addr,
ip_masklen(mask.sin.sin_addr),
&brd.sin.sin_addr);
break;
case AF_INET6:
/* Unset interface index from link-local address when IPv6 stack
is KAME. */
if (IN6_IS_ADDR_LINKLOCAL(&addr.sin6.sin6_addr)) {
SET_IN6_LINKLOCAL_IFINDEX(addr.sin6.sin6_addr, 0);
}
if (ifam->ifam_type == RTM_NEWADDR)
connected_add_ipv6(ifp, flags, &addr.sin6.sin6_addr,
ip6_masklen(mask.sin6.sin6_addr),
&brd.sin6.sin6_addr,
(isalias ? ifname : NULL));
else
connected_delete_ipv6(ifp, &addr.sin6.sin6_addr,
ip6_masklen(mask.sin6.sin6_addr),
&brd.sin6.sin6_addr);
break;
default:
/* Unsupported family silently ignore... */
break;
}
/* Check interface flag for implicit up of the interface. */
if_refresh(ifp);
#ifdef SUNOS_5
/* In addition to lacking IFANNOUNCE, on SUNOS IFF_UP is strange.
* See comments for SUNOS_5 in interface.c::if_flags_mangle.
*
* Here we take care of case where the real IFF_UP was previously
* unset (as kept in struct zebra_if.primary_state) and the mangled
* IFF_UP (ie IFF_UP set || listcount(connected) has now transitioned
* to unset due to the lost non-primary address having DELADDR'd.
*
* we must delete the interface, because in between here and next
* event for this interface-name the administrator could unplumb
* and replumb the interface.
*/
if (!if_is_up(ifp))
if_delete_update(ifp);
#endif /* SUNOS_5 */
return 0;
}
/* Interface function for reading kernel routing table information. */
static int rtm_read_mesg(struct rt_msghdr *rtm, union sockunion *dest,
union sockunion *mask, union sockunion *gate,
char *ifname, short *ifnlen)
{
caddr_t pnt, end;
/* Pnt points out socket data start point. */
pnt = (caddr_t)(rtm + 1);
end = ((caddr_t)rtm) + rtm->rtm_msglen;
/* rt_msghdr version check. */
if (rtm->rtm_version != RTM_VERSION)
zlog_warn(
"Routing message version different %d should be %d."
"This may cause problem\n",
rtm->rtm_version, RTM_VERSION);
/* Be sure structure is cleared */
memset(dest, 0, sizeof(union sockunion));
memset(gate, 0, sizeof(union sockunion));
memset(mask, 0, sizeof(union sockunion));
/* We fetch each socket variable into sockunion. */
RTA_ADDR_GET(dest, RTA_DST, rtm->rtm_addrs, pnt);
RTA_ADDR_GET(gate, RTA_GATEWAY, rtm->rtm_addrs, pnt);
RTA_ATTR_GET(mask, RTA_NETMASK, rtm->rtm_addrs, pnt);
RTA_ADDR_GET(NULL, RTA_GENMASK, rtm->rtm_addrs, pnt);
RTA_NAME_GET(ifname, RTA_IFP, rtm->rtm_addrs, pnt, *ifnlen);
RTA_ADDR_GET(NULL, RTA_IFA, rtm->rtm_addrs, pnt);
RTA_ADDR_GET(NULL, RTA_AUTHOR, rtm->rtm_addrs, pnt);
RTA_ADDR_GET(NULL, RTA_BRD, rtm->rtm_addrs, pnt);
/* If there is netmask information set it's family same as
destination family*/
if (rtm->rtm_addrs & RTA_NETMASK)
mask->sa.sa_family = dest->sa.sa_family;
/* Assert read up to the end of pointer. */
if (pnt != end)
zlog_warn("rtm_read() doesn't read all socket data.");
return rtm->rtm_flags;
}
void rtm_read(struct rt_msghdr *rtm)
{
int flags;
u_char zebra_flags;
union sockunion dest, mask, gate;
char ifname[INTERFACE_NAMSIZ + 1];
short ifnlen = 0;
zebra_flags = 0;
/* Read destination and netmask and gateway from rtm message
structure. */
flags = rtm_read_mesg(rtm, &dest, &mask, &gate, ifname, &ifnlen);
if (!(flags & RTF_DONE))
return;
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: got rtm of type %d (%s)", __func__,
rtm->rtm_type,
lookup_msg(rtm_type_str, rtm->rtm_type, NULL));
#ifdef RTF_CLONED /*bsdi, netbsd 1.6*/
if (flags & RTF_CLONED)
return;
#endif
#ifdef RTF_WASCLONED /*freebsd*/
if (flags & RTF_WASCLONED)
return;
#endif
if ((rtm->rtm_type == RTM_ADD || rtm->rtm_type == RTM_CHANGE)
&& !(flags & RTF_UP))
return;
/* This is connected route. */
if (!(flags & RTF_GATEWAY))
return;
if (flags & RTF_PROTO1)
SET_FLAG(zebra_flags, ZEBRA_FLAG_SELFROUTE);
/* This is persistent route. */
if (flags & RTF_STATIC)
SET_FLAG(zebra_flags, ZEBRA_FLAG_STATIC);
/* This is a reject or blackhole route */
if (flags & RTF_REJECT)
SET_FLAG(zebra_flags, ZEBRA_FLAG_REJECT);
if (flags & RTF_BLACKHOLE)
SET_FLAG(zebra_flags, ZEBRA_FLAG_BLACKHOLE);
if (dest.sa.sa_family == AF_INET) {
struct prefix p;
p.family = AF_INET;
p.u.prefix4 = dest.sin.sin_addr;
if (flags & RTF_HOST)
p.prefixlen = IPV4_MAX_PREFIXLEN;
else
p.prefixlen = ip_masklen(mask.sin.sin_addr);
/* Catch self originated messages and match them against our
* current RIB.
* At the same time, ignore unconfirmed messages, they should be
* tracked
* by rtm_write() and kernel_rtm_ipv4().
*/
if (rtm->rtm_type != RTM_GET && rtm->rtm_pid == pid) {
char buf[PREFIX_STRLEN], gate_buf[INET_ADDRSTRLEN];
int ret;
if (!IS_ZEBRA_DEBUG_RIB)
return;
ret = rib_lookup_ipv4_route((struct prefix_ipv4 *)&p,
&gate, VRF_DEFAULT);
prefix2str(&p, buf, sizeof(buf));
switch (rtm->rtm_type) {
case RTM_ADD:
case RTM_GET:
case RTM_CHANGE:
/* The kernel notifies us about a new route in
FIB created by us.
Do we have a correspondent entry in our RIB?
*/
switch (ret) {
case ZEBRA_RIB_NOTFOUND:
zlog_debug(
"%s: %s %s: desync: RR isn't yet in RIB, while already in FIB",
__func__,
lookup_msg(rtm_type_str,
rtm->rtm_type, NULL),
buf);
break;
case ZEBRA_RIB_FOUND_CONNECTED:
case ZEBRA_RIB_FOUND_NOGATE:
inet_ntop(AF_INET, &gate.sin.sin_addr,
gate_buf, INET_ADDRSTRLEN);
zlog_debug(
"%s: %s %s: desync: RR is in RIB, but gate differs (ours is %s)",
__func__,
lookup_msg(rtm_type_str,
rtm->rtm_type, NULL),
buf, gate_buf);
break;
case ZEBRA_RIB_FOUND_EXACT: /* RIB RR == FIB RR
*/
zlog_debug(
"%s: %s %s: done Ok", __func__,
lookup_msg(rtm_type_str,
rtm->rtm_type, NULL),
buf);
rib_lookup_and_dump(
(struct prefix_ipv4 *)&p,
VRF_DEFAULT);
return;
break;
}
break;
case RTM_DELETE:
/* The kernel notifies us about a route deleted
by us. Do we still
have it in the RIB? Do we have anything
instead? */
switch (ret) {
case ZEBRA_RIB_FOUND_EXACT:
zlog_debug(
"%s: %s %s: desync: RR is still in RIB, while already not in FIB",
__func__,
lookup_msg(rtm_type_str,
rtm->rtm_type, NULL),
buf);
rib_lookup_and_dump(
(struct prefix_ipv4 *)&p,
VRF_DEFAULT);
break;
case ZEBRA_RIB_FOUND_CONNECTED:
case ZEBRA_RIB_FOUND_NOGATE:
zlog_debug(
"%s: %s %s: desync: RR is still in RIB, plus gate differs",
__func__,
lookup_msg(rtm_type_str,
rtm->rtm_type, NULL),
buf);
rib_lookup_and_dump(
(struct prefix_ipv4 *)&p,
VRF_DEFAULT);
break;
case ZEBRA_RIB_NOTFOUND: /* RIB RR == FIB RR */
zlog_debug(
"%s: %s %s: done Ok", __func__,
lookup_msg(rtm_type_str,
rtm->rtm_type, NULL),
buf);
rib_lookup_and_dump(
(struct prefix_ipv4 *)&p,
VRF_DEFAULT);
return;
break;
}
break;
default:
zlog_debug(
"%s: %s: warning: loopback RTM of type %s received",
__func__, buf,
lookup_msg(rtm_type_str, rtm->rtm_type,
NULL));
}
return;
}
/* Change, delete the old prefix, we have no further information
* to specify the route really
*/
if (rtm->rtm_type == RTM_CHANGE)
rib_delete(AFI_IP, SAFI_UNICAST, VRF_DEFAULT,
ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
NULL, 0, 0, 0);
union g_addr ggate = {.ipv4 = gate.sin.sin_addr};
if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD
|| rtm->rtm_type == RTM_CHANGE)
rib_add(AFI_IP, SAFI_UNICAST, VRF_DEFAULT,
ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
&ggate, NULL, 0, 0, 0, 0, 0);
else
rib_delete(AFI_IP, SAFI_UNICAST, VRF_DEFAULT,
ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
&ggate, 0, 0, 0);
}
if (dest.sa.sa_family == AF_INET6) {
/* One day we might have a debug section here like one in the
* IPv4 case above. Just ignore own messages at the moment.
*/
if (rtm->rtm_type != RTM_GET && rtm->rtm_pid == pid)
return;
struct prefix p;
ifindex_t ifindex = 0;
p.family = AF_INET6;
p.u.prefix6 = dest.sin6.sin6_addr;
if (flags & RTF_HOST)
p.prefixlen = IPV6_MAX_PREFIXLEN;
else
p.prefixlen = ip6_masklen(mask.sin6.sin6_addr);
#ifdef KAME
if (IN6_IS_ADDR_LINKLOCAL(&gate.sin6.sin6_addr)) {
ifindex = IN6_LINKLOCAL_IFINDEX(gate.sin6.sin6_addr);
SET_IN6_LINKLOCAL_IFINDEX(gate.sin6.sin6_addr, 0);
}
#endif /* KAME */
/* CHANGE: delete the old prefix, we have no further information
* to specify the route really
*/
if (rtm->rtm_type == RTM_CHANGE)
rib_delete(AFI_IP6, SAFI_UNICAST, VRF_DEFAULT,
ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
NULL, 0, 0, 0);
union g_addr ggate = {.ipv6 = gate.sin6.sin6_addr};
if (rtm->rtm_type == RTM_GET || rtm->rtm_type == RTM_ADD
|| rtm->rtm_type == RTM_CHANGE)
rib_add(AFI_IP6, SAFI_UNICAST, VRF_DEFAULT,
ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
&ggate, NULL, ifindex, 0, 0, 0, 0);
else
rib_delete(AFI_IP6, SAFI_UNICAST, VRF_DEFAULT,
ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p, NULL,
&ggate, ifindex, 0, 0);
}
}
/* Interface function for the kernel routing table updates. Support
* for RTM_CHANGE will be needed.
* Exported only for rt_socket.c
*/
int rtm_write(int message, union sockunion *dest, union sockunion *mask,
union sockunion *gate, union sockunion *mpls, unsigned int index,
int zebra_flags, int metric)
{
int ret;
caddr_t pnt;
struct interface *ifp;
/* Sequencial number of routing message. */
static int msg_seq = 0;
/* Struct of rt_msghdr and buffer for storing socket's data. */
struct {
struct rt_msghdr rtm;
char buf[512];
} msg;
if (routing_sock < 0)
return ZEBRA_ERR_EPERM;
/* Clear and set rt_msghdr values */
memset(&msg, 0, sizeof(struct rt_msghdr));
msg.rtm.rtm_version = RTM_VERSION;
msg.rtm.rtm_type = message;
msg.rtm.rtm_seq = msg_seq++;
msg.rtm.rtm_addrs = RTA_DST;
msg.rtm.rtm_addrs |= RTA_GATEWAY;
msg.rtm.rtm_flags = RTF_UP;
#ifdef __OpenBSD__
msg.rtm.rtm_flags |= RTF_MPATH;
msg.rtm.rtm_fmask = RTF_MPLS;
#endif
msg.rtm.rtm_index = index;
if (metric != 0) {
msg.rtm.rtm_rmx.rmx_hopcount = metric;
msg.rtm.rtm_inits |= RTV_HOPCOUNT;
}
ifp = if_lookup_by_index(index, VRF_DEFAULT);
if (gate && (message == RTM_ADD || message == RTM_CHANGE))
msg.rtm.rtm_flags |= RTF_GATEWAY;
/* When RTF_CLONING is unavailable on BSD, should we set some
* other flag instead?
*/
#ifdef RTF_CLONING
if (!gate && (message == RTM_ADD || message == RTM_CHANGE) && ifp
&& (ifp->flags & IFF_POINTOPOINT) == 0)
msg.rtm.rtm_flags |= RTF_CLONING;
#endif /* RTF_CLONING */
/* If no protocol specific gateway is specified, use link
address for gateway. */
if (!gate) {
if (!ifp) {
char dest_buf[INET_ADDRSTRLEN] = "NULL",
mask_buf[INET_ADDRSTRLEN] = "255.255.255.255";
if (dest)
inet_ntop(AF_INET, &dest->sin.sin_addr,
dest_buf, INET_ADDRSTRLEN);
if (mask)
inet_ntop(AF_INET, &mask->sin.sin_addr,
mask_buf, INET_ADDRSTRLEN);
zlog_warn(
"%s: %s/%s: gate == NULL and no gateway found for ifindex %d",
__func__, dest_buf, mask_buf, index);
return -1;
}
gate = (union sockunion *)&((struct zebra_if *)ifp->info)->sdl;
}
if (mask)
msg.rtm.rtm_addrs |= RTA_NETMASK;
else if (message == RTM_ADD || message == RTM_CHANGE)
msg.rtm.rtm_flags |= RTF_HOST;
#ifdef __OpenBSD__
if (mpls) {
msg.rtm.rtm_addrs |= RTA_SRC;
msg.rtm.rtm_flags |= RTF_MPLS;
if (mpls->smpls.smpls_label
!= htonl(MPLS_IMP_NULL_LABEL << MPLS_LABEL_OFFSET))
msg.rtm.rtm_mpls = MPLS_OP_PUSH;
}
#endif
/* Tagging route with flags */
msg.rtm.rtm_flags |= (RTF_PROTO1);
/* Additional flags. */
if (zebra_flags & ZEBRA_FLAG_BLACKHOLE)
msg.rtm.rtm_flags |= RTF_BLACKHOLE;
if (zebra_flags & ZEBRA_FLAG_REJECT)
msg.rtm.rtm_flags |= RTF_REJECT;
#define SOCKADDRSET(X, R) \
if (msg.rtm.rtm_addrs & (R)) { \
int len = SAROUNDUP(X); \
memcpy(pnt, (caddr_t)(X), len); \
pnt += len; \
}
pnt = (caddr_t)msg.buf;
/* Write each socket data into rtm message buffer */
SOCKADDRSET(dest, RTA_DST);
SOCKADDRSET(gate, RTA_GATEWAY);
SOCKADDRSET(mask, RTA_NETMASK);
#ifdef __OpenBSD__
SOCKADDRSET(mpls, RTA_SRC);
#endif
msg.rtm.rtm_msglen = pnt - (caddr_t)&msg;
ret = write(routing_sock, &msg, msg.rtm.rtm_msglen);
if (ret != msg.rtm.rtm_msglen) {
if (errno == EEXIST)
return ZEBRA_ERR_RTEXIST;
if (errno == ENETUNREACH)
return ZEBRA_ERR_RTUNREACH;
if (errno == ESRCH)
return ZEBRA_ERR_RTNOEXIST;
zlog_warn("%s: write : %s (%d)", __func__, safe_strerror(errno),
errno);
return ZEBRA_ERR_KERNEL;
}
return ZEBRA_ERR_NOERROR;
}
#include "thread.h"
#include "zebra/zserv.h"
/* For debug purpose. */
static void rtmsg_debug(struct rt_msghdr *rtm)
{
zlog_debug("Kernel: Len: %d Type: %s", rtm->rtm_msglen,
lookup_msg(rtm_type_str, rtm->rtm_type, NULL));
rtm_flag_dump(rtm->rtm_flags);
zlog_debug("Kernel: message seq %d", rtm->rtm_seq);
zlog_debug("Kernel: pid %lld, rtm_addrs 0x%x", (long long)rtm->rtm_pid,
rtm->rtm_addrs);
}
/* This is pretty gross, better suggestions welcome -- mhandler */
#ifndef RTAX_MAX
#ifdef RTA_NUMBITS
#define RTAX_MAX RTA_NUMBITS
#else
#define RTAX_MAX 8
#endif /* RTA_NUMBITS */
#endif /* RTAX_MAX */
/* Kernel routing table and interface updates via routing socket. */
static int kernel_read(struct thread *thread)
{
int sock;
int nbytes;
struct rt_msghdr *rtm;
/*
* This must be big enough for any message the kernel might send.
* Rather than determining how many sockaddrs of what size might be
* in each particular message, just use RTAX_MAX of sockaddr_storage
* for each. Note that the sockaddrs must be after each message
* definition, or rather after whichever happens to be the largest,
* since the buffer needs to be big enough for a message and the
* sockaddrs together.
*/
union {
/* Routing information. */
struct {
struct rt_msghdr rtm;
struct sockaddr_storage addr[RTAX_MAX];
} r;
/* Interface information. */
struct {
struct if_msghdr ifm;
struct sockaddr_storage addr[RTAX_MAX];
} im;
/* Interface address information. */
struct {
struct ifa_msghdr ifa;
struct sockaddr_storage addr[RTAX_MAX];
} ia;
#ifdef RTM_IFANNOUNCE
/* Interface arrival/departure */
struct {
struct if_announcemsghdr ifan;
struct sockaddr_storage addr[RTAX_MAX];
} ian;
#endif /* RTM_IFANNOUNCE */
} buf;
/* Fetch routing socket. */
sock = THREAD_FD(thread);
nbytes = read(sock, &buf, sizeof buf);
if (nbytes <= 0) {
if (nbytes < 0 && errno != EWOULDBLOCK && errno != EAGAIN)
zlog_warn("routing socket error: %s",
safe_strerror(errno));
return 0;
}
thread_add_read(zebrad.master, kernel_read, NULL, sock, NULL);
if (IS_ZEBRA_DEBUG_KERNEL)
rtmsg_debug(&buf.r.rtm);
rtm = &buf.r.rtm;
/*
* Ensure that we didn't drop any data, so that processing routines
* can assume they have the whole message.
*/
if (rtm->rtm_msglen != nbytes) {
zlog_warn(
"kernel_read: rtm->rtm_msglen %d, nbytes %d, type %d\n",
rtm->rtm_msglen, nbytes, rtm->rtm_type);
return -1;
}
switch (rtm->rtm_type) {
case RTM_ADD:
case RTM_DELETE:
case RTM_CHANGE:
rtm_read(rtm);
break;
case RTM_IFINFO:
ifm_read(&buf.im.ifm);
break;
case RTM_NEWADDR:
case RTM_DELADDR:
ifam_read(&buf.ia.ifa);
break;
#ifdef RTM_IFANNOUNCE
case RTM_IFANNOUNCE:
ifan_read(&buf.ian.ifan);
break;
#endif /* RTM_IFANNOUNCE */
default:
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("Unprocessed RTM_type: %d", rtm->rtm_type);
break;
}
return 0;
}
/* Make routing socket. */
static void routing_socket(struct zebra_ns *zns)
{
if (zserv_privs.change(ZPRIVS_RAISE))
zlog_err("routing_socket: Can't raise privileges");
routing_sock = socket(AF_ROUTE, SOCK_RAW, 0);
if (routing_sock < 0) {
if (zserv_privs.change(ZPRIVS_LOWER))
zlog_err("routing_socket: Can't lower privileges");
zlog_warn("Can't init kernel routing socket");
return;
}
/* XXX: Socket should be NONBLOCK, however as we currently
* discard failed writes, this will lead to inconsistencies.
* For now, socket must be blocking.
*/
/*if (fcntl (routing_sock, F_SETFL, O_NONBLOCK) < 0)
zlog_warn ("Can't set O_NONBLOCK to routing socket");*/
if (zserv_privs.change(ZPRIVS_LOWER))
zlog_err("routing_socket: Can't lower privileges");
/* kernel_read needs rewrite. */
thread_add_read(zebrad.master, kernel_read, NULL, routing_sock, NULL);
}
/* Exported interface function. This function simply calls
routing_socket (). */
void kernel_init(struct zebra_ns *zns)
{
routing_socket(zns);
}
void kernel_terminate(struct zebra_ns *zns)
{
return;
}
#endif /* !HAVE_NETLINK */
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