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kernel_socket.c
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// SPDX-License-Identifier: GPL-2.0-or-later
/* Kernel communication using routing socket.
* Copyright (C) 1999 Kunihiro Ishiguro
*/
#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 "ioctl.h"
#include "log.h"
#include "table.h"
#include "rib.h"
#include "privs.h"
#include "vrf.h"
#include "lib_errors.h"
#include "zebra/rt.h"
#include "zebra/interface.h"
#include "zebra/zebra_router.h"
#include "zebra/debug.h"
#include "zebra/kernel_socket.h"
#include "zebra/rib.h"
#include "zebra/zebra_errors.h"
#include "zebra/zebra_ptm.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 frr calls ROUNDUP with 0.
*/
#ifdef __APPLE__
#define ROUNDUP_TYPE int
#else
#define ROUNDUP_TYPE long
#endif
/*
* Because of these varying conventions, the only sane approach is for
* the <net/route.h> header to define some flavor of ROUNDUP macro.
*/
/* OS X (Xcode as of 2014-12) is known not to define RT_ROUNDUP */
#if defined(RT_ROUNDUP)
#define ROUNDUP(a) RT_ROUNDUP(a)
#endif /* defined(RT_ROUNDUP) */
/*
* If ROUNDUP has not yet been defined in terms of platform-provided
* defines, attempt to cope with heuristics.
*/
#if !defined(ROUNDUP)
/*
* If you're porting to a platform that changed RT_ROUNDUP but doesn't
* have it in its headers, this will break rather obviously and you'll
* have to fix it here.
*/
#define ROUNDUP(a) \
((a) > 0 ? (1 + (((a)-1) | (sizeof(ROUNDUP_TYPE) - 1))) \
: sizeof(ROUNDUP_TYPE))
#endif /* defined(ROUNDUP) */
#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 */
/*
* 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 */
/* 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"},
#ifdef RTM_LOCK
{RTM_LOCK, "RTM_LOCK"},
#endif /* RTM_LOCK */
#ifdef OLDADD
{RTM_OLDADD, "RTM_OLDADD"},
#endif /* RTM_OLDADD */
#ifdef RTM_OLDDEL
{RTM_OLDDEL, "RTM_OLDDEL"},
#endif /* RTM_OLDDEL */
#ifdef RTM_RESOLVE
{RTM_RESOLVE, "RTM_RESOLVE"},
#endif /* 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 */
#ifdef RTM_IEEE80211
{RTM_IEEE80211, "RTM_IEEE80211"},
#endif
{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;
/* Kernel dataplane routing update socket, used in the dataplane pthread
* context.
*/
int dplane_routing_sock = -1;
/* Yes I'm checking ugly routing socket behavior. */
/* #define DEBUG */
size_t _rta_get(caddr_t sap, void *destp, size_t destlen, bool checkaf);
size_t rta_get(caddr_t sap, void *dest, size_t destlen);
size_t rta_getattr(caddr_t sap, void *destp, size_t destlen);
size_t rta_getsdlname(caddr_t sap, void *dest, short *destlen);
const char *rtatostr(unsigned int flags, char *buf, size_t buflen);
/* 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;
}
size_t _rta_get(caddr_t sap, void *destp, size_t destlen, bool checkaf)
{
struct sockaddr *sa = (struct sockaddr *)sap;
struct sockaddr_dl *sdl;
uint8_t *dest = destp;
size_t tlen, copylen;
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
copylen = sa->sa_len;
tlen = (copylen == 0) ? sizeof(ROUNDUP_TYPE) : ROUNDUP(copylen);
#else /* !HAVE_STRUCT_SOCKADDR_SA_LEN */
copylen = tlen = SAROUNDUP(sap);
#endif /* !HAVE_STRUCT_SOCKADDR_SA_LEN */
if (copylen > 0 && dest != NULL) {
if (checkaf && af_check(sa->sa_family) == 0)
return tlen;
/*
* Handle sockaddr_dl corner case:
* RTA_NETMASK might be AF_LINK, but it doesn't anything
* relevant (e.g. zeroed out fields). Check for this
* case and avoid warning log message.
*/
if (sa->sa_family == AF_LINK) {
sdl = (struct sockaddr_dl *)sa;
if (sdl->sdl_index == 0 || sdl->sdl_nlen == 0)
copylen = destlen;
}
if (copylen > destlen) {
zlog_warn(
"%s: destination buffer too small (%zu vs %zu)",
__func__, copylen, destlen);
memcpy(dest, sap, destlen);
} else
memcpy(dest, sap, copylen);
}
return tlen;
}
size_t rta_get(caddr_t sap, void *destp, size_t destlen)
{
return _rta_get(sap, destp, destlen, true);
}
size_t rta_getattr(caddr_t sap, void *destp, size_t destlen)
{
return _rta_get(sap, destp, destlen, false);
}
size_t rta_getsdlname(caddr_t sap, void *destp, short *destlen)
{
struct sockaddr_dl *sdl = (struct sockaddr_dl *)sap;
uint8_t *dest = destp;
size_t tlen, copylen;
copylen = sdl->sdl_nlen;
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
struct sockaddr *sa = (struct sockaddr *)sap;
tlen = (sa->sa_len == 0) ? sizeof(ROUNDUP_TYPE) : ROUNDUP(sa->sa_len);
#else /* !HAVE_STRUCT_SOCKADDR_SA_LEN */
tlen = SAROUNDUP(sap);
#endif /* !HAVE_STRUCT_SOCKADDR_SA_LEN */
if (copylen > 0 && dest != NULL && sdl->sdl_family == AF_LINK) {
if (copylen > IFNAMSIZ) {
zlog_warn(
"%s: destination buffer too small (%zu vs %d)",
__func__, copylen, IFNAMSIZ);
memcpy(dest, sdl->sdl_data, IFNAMSIZ);
dest[IFNAMSIZ] = 0;
*destlen = IFNAMSIZ;
} else {
memcpy(dest, sdl->sdl_data, copylen);
dest[copylen] = 0;
*destlen = copylen;
}
} else
*destlen = 0;
return tlen;
}
const char *rtatostr(unsigned int flags, char *buf, size_t buflen)
{
const char *flagstr, *bufstart;
int bit, wlen;
char ustr[32];
/* Hold the pointer to the buffer beginning. */
bufstart = buf;
for (bit = 1; bit; bit <<= 1) {
if ((flags & bit) == 0)
continue;
switch (bit) {
case RTA_DST:
flagstr = "DST";
break;
case RTA_GATEWAY:
flagstr = "GATEWAY";
break;
case RTA_NETMASK:
flagstr = "NETMASK";
break;
#ifdef RTA_GENMASK
case RTA_GENMASK:
flagstr = "GENMASK";
break;
#endif /* RTA_GENMASK */
case RTA_IFP:
flagstr = "IFP";
break;
case RTA_IFA:
flagstr = "IFA";
break;
#ifdef RTA_AUTHOR
case RTA_AUTHOR:
flagstr = "AUTHOR";
break;
#endif /* RTA_AUTHOR */
case RTA_BRD:
flagstr = "BRD";
break;
#ifdef RTA_SRC
case RTA_SRC:
flagstr = "SRC";
break;
#endif /* RTA_SRC */
#ifdef RTA_SRCMASK
case RTA_SRCMASK:
flagstr = "SRCMASK";
break;
#endif /* RTA_SRCMASK */
#ifdef RTA_LABEL
case RTA_LABEL:
flagstr = "LABEL";
break;
#endif /* RTA_LABEL */
default:
snprintf(ustr, sizeof(ustr), "0x%x", bit);
flagstr = ustr;
break;
}
wlen = snprintf(buf, buflen, "%s,", flagstr);
buf += wlen;
buflen -= wlen;
}
/* Check for empty buffer. */
if (bufstart != buf)
buf--;
/* Remove the last comma. */
*buf = 0;
return bufstart;
}
/* 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(ifan->ifan_name, VRF_DEFAULT,
VRF_DEFAULT_NAME);
if_set_index(ifp, 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 (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 = NULL;
char ifname[IFNAMSIZ];
short ifnlen = 0;
int maskbit;
caddr_t cp;
char fbuf[64];
/* 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)) {
flog_err(EC_ZEBRA_NETLINK_LENGTH_ERROR,
"%s: ifm->ifm_msglen %d too short", __func__,
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);
/* Look up for RTA_IFP and skip others. */
for (maskbit = 1; maskbit; maskbit <<= 1) {
if ((maskbit & ifm->ifm_addrs) == 0)
continue;
if (maskbit != RTA_IFP) {
cp += rta_get(cp, NULL, 0);
continue;
}
/* Save the pointer to the structure. */
sdl = (struct sockaddr_dl *)cp;
cp += rta_getsdlname(cp, ifname, &ifnlen);
}
if (IS_ZEBRA_DEBUG_KERNEL)
zlog_debug("%s: sdl ifname %s addrs {%s}", __func__,
(ifnlen ? ifname : "(nil)"),
rtatostr(ifm->ifm_addrs, fbuf, sizeof(fbuf)));
/*
* 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 doesn't 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_debug("Interface index %d (new) missing ifname",
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_get_by_name(ifname, VRF_DEFAULT,
VRF_DEFAULT_NAME);
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.
*/
if_set_index(ifp, 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_getsdlname() 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_debug(
"%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 (ifp && if_is_up(ifp)) {
#if defined(__bsdi__)
if_kvm_get_mtu(ifp);
#else
if_get_mtu(ifp);
#endif /* __bsdi__ */
if_get_metric(ifp);
}
}
if (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;
int maskbit;
char fbuf[64];
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. */
for (maskbit = 1; maskbit; maskbit <<= 1) {
if ((maskbit & ifm->ifam_addrs) == 0)
continue;
switch (maskbit) {
case RTA_DST:
pnt += rta_get(pnt, &dst, sizeof(dst));
break;
case RTA_GATEWAY:
pnt += rta_get(pnt, &gateway, sizeof(gateway));
break;
case RTA_NETMASK:
pnt += rta_getattr(pnt, mask, sizeof(*mask));
break;
case RTA_IFP:
pnt += rta_getsdlname(pnt, ifname, ifnlen);
break;
case RTA_IFA:
pnt += rta_get(pnt, addr, sizeof(*addr));
break;
case RTA_BRD:
pnt += rta_get(pnt, brd, sizeof(*brd));
break;
default:
pnt += rta_get(pnt, NULL, 0);
break;
}
if (pnt > end) {
zlog_warn("%s: overflow detected (pnt:%p end:%p)",
__func__, pnt, end);
break;
}
}
if (IS_ZEBRA_DEBUG_KERNEL) {
switch (sockunion_family(addr)) {
case AF_INET:
case AF_INET6: {
int masklen =
(sockunion_family(addr) == AF_INET)
? ip_masklen(mask->sin.sin_addr)
: ip6_masklen(mask->sin6.sin6_addr);
zlog_debug(
"%s: ifindex %d, ifname %s, ifam_addrs {%s}, ifam_flags 0x%x, addr %pSU/%d broad %pSU dst %pSU gateway %pSU",
__func__, ifm->ifam_index,
(ifnlen ? ifname : "(nil)"),
rtatostr(ifm->ifam_addrs, fbuf, sizeof(fbuf)),
ifm->ifam_flags, addr, masklen, brd, &dst,
&gateway);
} break;
default:
zlog_debug("%s: ifindex %d, ifname %s, ifam_addrs {%s}",
__func__, ifm->ifam_index,
(ifnlen ? ifname : "(nil)"),
rtatostr(ifm->ifam_addrs, fbuf,
sizeof(fbuf)));
break;
}
}
/* Assert read up end point matches to end point */
pnt = (caddr_t)ROUNDUP((size_t)pnt);
if (pnt != (caddr_t)ROUNDUP((size_t)end))
zlog_debug("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;
bool dest_same = false;
char ifname[INTERFACE_NAMSIZ];
short ifnlen = 0;
bool isalias = false;
uint32_t 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) {
flog_warn(EC_ZEBRA_UNKNOWN_INTERFACE,
"%s: no interface for ifname %s, index %d", __func__,
ifname, ifam->ifam_index);
return -1;
}
if (ifnlen && strncmp(ifp->name, ifname, INTERFACE_NAMSIZ))
isalias = true;
/*
* Mark the alias prefixes as secondary
*/
if (isalias)
SET_FLAG(flags, ZEBRA_IFA_SECONDARY);
/* 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);
else {
if (memcmp(&addr, &brd, sizeof(addr)) == 0)
dest_same = true;
}
#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),
dest_same ? NULL : &brd.sin.sin_addr,
(isalias ? ifname : NULL),
METRIC_MAX);
else
connected_delete_ipv4(ifp, flags, &addr.sin.sin_addr,
ip_masklen(mask.sin.sin_addr),
dest_same ? NULL
: &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,
NULL,
ip6_masklen(mask.sin6.sin6_addr),
(isalias ? ifname : NULL),
METRIC_MAX);
else
connected_delete_ipv6(ifp, &addr.sin6.sin6_addr, NULL,
ip6_masklen(mask.sin6.sin6_addr));
break;
default:
/* Unsupported family silently ignore... */
break;
}
/* Check interface flag for implicit up of the interface. */
if_refresh(ifp);
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;
int maskbit;
/* 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)
flog_warn(EC_ZEBRA_RTM_VERSION_MISMATCH,
"Routing message version different %d should be %d.This may cause problem",
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. */
/* We fetch each socket variable into sockunion. */
for (maskbit = 1; maskbit; maskbit <<= 1) {
if ((maskbit & rtm->rtm_addrs) == 0)
continue;
switch (maskbit) {
case RTA_DST:
pnt += rta_get(pnt, dest, sizeof(*dest));
break;
case RTA_GATEWAY:
pnt += rta_get(pnt, gate, sizeof(*gate));
break;
case RTA_NETMASK:
pnt += rta_getattr(pnt, mask, sizeof(*mask));
break;
case RTA_IFP:
pnt += rta_getsdlname(pnt, ifname, ifnlen);
break;
default:
pnt += rta_get(pnt, NULL, 0);
break;
}
if (pnt > end) {
zlog_warn("%s: overflow detected (pnt:%p end:%p)",
__func__, pnt, end);
break;
}
}
/* 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_debug("rtm_read() doesn't read all socket data.");
return rtm->rtm_flags;
}
void rtm_read(struct rt_msghdr *rtm)
{
int flags;
uint32_t zebra_flags;
union sockunion dest, mask, gate;
char ifname[INTERFACE_NAMSIZ + 1];
short ifnlen = 0;
struct nexthop nh;