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mirror_frr/zebra/kernel_socket.c
Donald Sharp 44e9909db4 zebra: Refactor struct zebra_t 
We were including 'extern struct zebra_t zebrad;' all
over the place.  This made no sense.  Refactor
into zserv.h where the definition was and remove resulting
unnecessary code.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
Reviewed-by: Don Slice <dslice@cumulusnetworks.com>
Reviewed-by: Vivek Venkatraman <vivek@cumulusnetworks.com>
2016-04-14 20:56:45 -04:00

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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 GNU Zebra; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#include <zebra.h>
#include "if.h"
#include "prefix.h"
#include "sockunion.h"
#include "connected.h"
#include "memory.h"
#include "ioctl.h"
#include "log.h"
#include "str.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;
/*
* Given a sockaddr length, round it up to include pad bytes following
* it. Assumes the kernel pads to sizeof(long).
*
* XXX: why is ROUNDUP(0) sizeof(long)? 0 is an illegal sockaddr
* length anyway (< sizeof (struct sockaddr)), so this shouldn't
* matter.
* On OS X, both 32, 64bit syatems align on 4 byte boundary
*/
#ifdef __APPLE__
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(int) - 1))) : sizeof(int))
#else
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#endif
/*
* 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)
#elif defined(HAVE_IPV6)
/*
* 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))))
#else /* HAVE_IPV6 */
#define SAROUNDUP(X) \
(((struct sockaddr *)(X))->sa_family == AF_INET ? \
ROUNDUP(sizeof(struct sockaddr_in)):\
(((struct sockaddr *)(X))->sa_family == AF_LINK ? \
ROUNDUP(sizeof(struct sockaddr_dl)) : sizeof(struct sockaddr)))
#endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */
/*
* 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 void inline
rta_copy (union sockunion *dest, caddr_t src) {
int len;
#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 ( ((DEST) != NULL) && \
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)); \
if ((DEST) != NULL) \
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, NULL}
};
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 */
{RTF_XRESOLVE, "XRESOLVE"},
{RTF_LLINFO, "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, NULL}
};
/* Kernel routing update socket. */
int routing_sock = -1;
/* Yes I'm checking ugly routing socket behavior. */
/* #define DEBUG */
/* Supported address family check. */
static int inline
af_check (int family)
{
if (family == AF_INET)
return 1;
#ifdef HAVE_IPV6
if (family == AF_INET6)
return 1;
#endif /* HAVE_IPV6 */
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);
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)));
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 */
/*
* 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)) != 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);
/*
* 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);
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
*/
if (ifnlen)
{
#ifdef HAVE_STRUCT_SOCKADDR_DL_SDL_LEN
memcpy (&ifp->sdl, sdl, sdl->sdl_len);
#else
memcpy (&ifp->sdl, sdl, sizeof (struct sockaddr_dl));
#endif /* HAVE_STRUCT_SOCKADDR_DL_SDL_LEN */
}
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 */
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)
{
switch (sockunion_family(addr))
{
case AF_INET:
{
char buf[4][INET_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(AF_INET,&addr->sin.sin_addr,
buf[0],sizeof(buf[0])),
ip_masklen(mask->sin.sin_addr),
inet_ntop(AF_INET,&brd->sin.sin_addr,
buf[1],sizeof(buf[1])),
inet_ntop(AF_INET,&dst.sin.sin_addr,
buf[2],sizeof(buf[2])),
inet_ntop(AF_INET,&gateway.sin.sin_addr,
buf[3],sizeof(buf[3])));
}
break;
#ifdef HAVE_IPV6
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(AF_INET6,&addr->sin6.sin6_addr,
buf[0],sizeof(buf[0])),
ip6_masklen(mask->sin6.sin6_addr),
inet_ntop(AF_INET6,&brd->sin6.sin6_addr,
buf[1],sizeof(buf[1])),
inet_ntop(AF_INET6,&dst.sin6.sin6_addr,
buf[2],sizeof(buf[2])),
inet_ntop(AF_INET6,&gateway.sin6.sin6_addr,
buf[3],sizeof(buf[3])));
}
break;
#endif /* HAVE_IPV6 */
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)) == 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;
#ifdef HAVE_IPV6
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;
#endif /* HAVE_IPV6 */
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 (NULL, LOG_WARNING,
"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 (NULL, LOG_WARNING, "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 (rtm_type_str, rtm->rtm_type));
#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) && ! (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_ipv4 p;
p.family = AF_INET;
p.prefix = 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[PREFIX2STR_BUFFER], gate_buf[INET_ADDRSTRLEN];
int ret;
if (! IS_ZEBRA_DEBUG_RIB)
return;
ret = rib_lookup_ipv4_route (&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/%d: desync: RR isn't yet in RIB, while already in FIB",
__func__, lookup (rtm_type_str, rtm->rtm_type), buf, p.prefixlen);
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/%d: desync: RR is in RIB, but gate differs (ours is %s)",
__func__, lookup (rtm_type_str, rtm->rtm_type), buf, p.prefixlen, gate_buf);
break;
case ZEBRA_RIB_FOUND_EXACT: /* RIB RR == FIB RR */
zlog_debug ("%s: %s %s/%d: done Ok",
__func__, lookup (rtm_type_str, rtm->rtm_type), buf, p.prefixlen);
rib_lookup_and_dump (&p);
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/%d: desync: RR is still in RIB, while already not in FIB",
__func__, lookup (rtm_type_str, rtm->rtm_type), buf, p.prefixlen);
rib_lookup_and_dump (&p);
break;
case ZEBRA_RIB_FOUND_CONNECTED:
case ZEBRA_RIB_FOUND_NOGATE:
zlog_debug ("%s: %s %s/%d: desync: RR is still in RIB, plus gate differs",
__func__, lookup (rtm_type_str, rtm->rtm_type), buf, p.prefixlen);
rib_lookup_and_dump (&p);
break;
case ZEBRA_RIB_NOTFOUND: /* RIB RR == FIB RR */
zlog_debug ("%s: %s %s/%d: done Ok",
__func__, lookup (rtm_type_str, rtm->rtm_type), buf, p.prefixlen);
rib_lookup_and_dump (&p);
return;
break;
}
break;
default:
zlog_debug ("%s: %s/%d: warning: loopback RTM of type %s received",
__func__, buf, p.prefixlen, lookup (rtm_type_str, rtm->rtm_type));
}
return;
}
/* Change, delete the old prefix, we have no further information
* to specify the route really
*/
if (rtm->rtm_type == RTM_CHANGE)
rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p,
NULL, 0, VRF_DEFAULT, SAFI_UNICAST);
if (rtm->rtm_type == RTM_GET
|| rtm->rtm_type == RTM_ADD
|| rtm->rtm_type == RTM_CHANGE)
rib_add_ipv4 (ZEBRA_ROUTE_KERNEL, 0, zebra_flags,
&p, &gate.sin.sin_addr, NULL, 0, VRF_DEFAULT, 0, 0, SAFI_UNICAST);
else
rib_delete_ipv4 (ZEBRA_ROUTE_KERNEL, 0 zebra_flags,
&p, &gate.sin.sin_addr, 0, VRF_DEFAULT, SAFI_UNICAST);
}
#ifdef HAVE_IPV6
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_ipv6 p;
unsigned int ifindex = 0;
p.family = AF_INET6;
p.prefix = 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_ipv6 (ZEBRA_ROUTE_KERNEL, 0, zebra_flags, &p,
NULL, 0, VRF_DEFAULT, SAFI_UNICAST);
if (rtm->rtm_type == RTM_GET
|| rtm->rtm_type == RTM_ADD
|| rtm->rtm_type == RTM_CHANGE)
rib_add_ipv6 (ZEBRA_ROUTE_KERNEL, 0, zebra_flags,
&p, &gate.sin6.sin6_addr, ifindex, VRF_DEFAULT, 0, 0, SAFI_UNICAST);
else
rib_delete_ipv6 (ZEBRA_ROUTE_KERNEL, 0, zebra_flags,
&p, &gate.sin6.sin6_addr, ifindex, VRF_DEFAULT, SAFI_UNICAST);
}
#endif /* HAVE_IPV6 */
}
/* 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,
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;
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);
if (gate && message == RTM_ADD)
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 && 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 *) & ifp->sdl;
}
if (mask)
msg.rtm.rtm_addrs |= RTA_NETMASK;
else if (message == RTM_ADD)
msg.rtm.rtm_flags |= RTF_HOST;
/* 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;
#ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
#define SOCKADDRSET(X,R) \
if (msg.rtm.rtm_addrs & (R)) \
{ \
int len = ROUNDUP ((X)->sa.sa_len); \
memcpy (pnt, (caddr_t)(X), len); \
pnt += len; \
}
#else
#define SOCKADDRSET(X,R) \
if (msg.rtm.rtm_addrs & (R)) \
{ \
int len = SAROUNDUP (X); \
memcpy (pnt, (caddr_t)(X), len); \
pnt += len; \
}
#endif /* HAVE_STRUCT_SOCKADDR_IN_SIN_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);
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 (rtm_type_str, rtm->rtm_type));
rtm_flag_dump (rtm->rtm_flags);
zlog_debug ("Kernel: message seq %d", rtm->rtm_seq);
zlog_debug ("Kernel: pid %d, rtm_addrs 0x%x", 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);
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);
}
/* 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;
}
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