/
rtsock_shared.c
1795 lines (1617 loc) · 45.5 KB
/
rtsock_shared.c
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/* $NetBSD: rtsock_shared.c,v 1.19 2020/06/26 15:53:59 roy Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)rtsock.c 8.7 (Berkeley) 10/12/95
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: rtsock_shared.c,v 1.19 2020/06/26 15:53:59 roy Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_net_mpsafe.h"
#endif
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/sysctl.h>
#include <sys/kauth.h>
#include <sys/kmem.h>
#include <sys/intr.h>
#include <sys/condvar.h>
#include <sys/compat_stub.h>
#include <net/if.h>
#include <net/if_llatbl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/raw_cb.h>
#include <netinet/in_var.h>
#include <netinet/if_inarp.h>
#include <netmpls/mpls.h>
#include <compat/net/if.h>
#include <compat/net/route.h>
/* sa_family is after sa_len, rest is data */
#define _SA_MINSIZE (offsetof(struct sockaddr, sa_family) + \
sizeof(((struct sockaddr *)0)->sa_family))
#ifdef COMPAT_RTSOCK
/*
* These are used when #include-d from compat/common/rtsock_50.c
*/
#define RTM_XVERSION RTM_OVERSION
#define RTM_XNEWADDR RTM_ONEWADDR
#define RTM_XDELADDR RTM_ODELADDR
#define RTM_XCHGADDR RTM_OCHGADDR
#define RT_XADVANCE(a,b) RT_OADVANCE(a,b)
#define RT_XROUNDUP(n) RT_OROUNDUP(n)
#define PF_XROUTE PF_OROUTE
#define rt_xmsghdr rt_msghdr50
#define if_xmsghdr if_msghdr /* if_msghdr50 is for RTM_OIFINFO */
#define ifa_xmsghdr ifa_msghdr50
#define if_xannouncemsghdr if_announcemsghdr50
#define COMPATNAME(x) compat_50_ ## x
#define DOMAINNAME "oroute"
#define COMPATCALL(name, args) \
MODULE_HOOK_CALL_VOID(rtsock_ ## name ## _50_hook, args, __nothing);
#define RTS_CTASSERT(x) __nothing
CTASSERT(sizeof(struct ifa_xmsghdr) == 20);
DOMAIN_DEFINE(compat_50_routedomain); /* forward declare and add to link set */
#else /* COMPAT_RTSOCK */
/*
* These are used when #include-d from compat/common/rtsock_50.c
*/
#define RTM_XVERSION RTM_VERSION
#define RTM_XNEWADDR RTM_NEWADDR
#define RTM_XDELADDR RTM_DELADDR
#define RTM_XCHGADDR RTM_CHGADDR
#define RT_XADVANCE(a,b) RT_ADVANCE(a,b)
#define RT_XROUNDUP(n) RT_ROUNDUP(n)
#define PF_XROUTE PF_ROUTE
#define rt_xmsghdr rt_msghdr
#define if_xmsghdr if_msghdr
#define ifa_xmsghdr ifa_msghdr
#define if_xannouncemsghdr if_announcemsghdr
#define COMPATNAME(x) x
#define DOMAINNAME "route"
#define COMPATCALL(name, args) __nothing;
#define RTS_CTASSERT(x) CTASSERT(x)
CTASSERT(sizeof(struct ifa_xmsghdr) == 32);
DOMAIN_DEFINE(routedomain); /* forward declare and add to link set */
#endif /* COMPAT_RTSOCK */
#ifdef RTSOCK_DEBUG
#define RT_IN_PRINT(info, b, a) (in_print((b), sizeof(b), \
&((const struct sockaddr_in *)(info)->rti_info[(a)])->sin_addr), (b))
#endif /* RTSOCK_DEBUG */
struct route_info COMPATNAME(route_info) = {
.ri_dst = { .sa_len = 2, .sa_family = PF_XROUTE, },
.ri_src = { .sa_len = 2, .sa_family = PF_XROUTE, },
.ri_maxqlen = IFQ_MAXLEN,
};
static void COMPATNAME(route_init)(void);
static int COMPATNAME(route_output)(struct mbuf *, struct socket *);
static int rt_xaddrs(u_char, const char *, const char *, struct rt_addrinfo *);
static struct mbuf *rt_makeifannouncemsg(struct ifnet *, int, int,
struct rt_addrinfo *);
static int rt_msg2(int, struct rt_addrinfo *, void *, struct rt_walkarg *, int *);
static void _rt_setmetrics(int, const struct rt_xmsghdr *, struct rtentry *);
static void rtm_setmetrics(const struct rtentry *, struct rt_xmsghdr *);
static void rt_adjustcount(int, int);
static const struct protosw COMPATNAME(route_protosw)[];
struct routecb {
struct rawcb rocb_rcb;
unsigned int rocb_msgfilter;
#define RTMSGFILTER(m) (1U << (m))
char *rocb_missfilter;
size_t rocb_missfilterlen;
};
#define sotoroutecb(so) ((struct routecb *)(so)->so_pcb)
static struct rawcbhead rt_rawcb;
#ifdef NET_MPSAFE
static kmutex_t *rt_so_mtx;
static bool rt_updating = false;
static kcondvar_t rt_update_cv;
#endif
static void
rt_adjustcount(int af, int cnt)
{
struct route_cb * const cb = &COMPATNAME(route_info).ri_cb;
cb->any_count += cnt;
switch (af) {
case AF_INET:
cb->ip_count += cnt;
return;
#ifdef INET6
case AF_INET6:
cb->ip6_count += cnt;
return;
#endif
case AF_MPLS:
cb->mpls_count += cnt;
return;
}
}
static int
COMPATNAME(route_filter)(struct mbuf *m, struct sockproto *proto,
struct rawcb *rp)
{
struct routecb *rop = (struct routecb *)rp;
struct rt_xmsghdr *rtm;
KASSERT(m != NULL);
KASSERT(proto != NULL);
KASSERT(rp != NULL);
/* Wrong family for this socket. */
if (proto->sp_family != PF_ROUTE)
return ENOPROTOOPT;
/* If no filter set, just return. */
if (rop->rocb_msgfilter == 0 && rop->rocb_missfilterlen == 0)
return 0;
/* Ensure we can access rtm_type */
if (m->m_len <
offsetof(struct rt_xmsghdr, rtm_type) + sizeof(rtm->rtm_type))
return EINVAL;
rtm = mtod(m, struct rt_xmsghdr *);
if (rtm->rtm_type >= sizeof(rop->rocb_msgfilter) * CHAR_BIT)
return EINVAL;
/* If the rtm type is filtered out, return a positive. */
if (rop->rocb_msgfilter != 0 &&
!(rop->rocb_msgfilter & RTMSGFILTER(rtm->rtm_type)))
return EEXIST;
if (rop->rocb_missfilterlen != 0 && rtm->rtm_type == RTM_MISS) {
__CTASSERT(RTAX_DST == 0);
struct sockaddr_storage ss;
struct sockaddr *dst = (struct sockaddr *)&ss, *sa;
char *cp = rop->rocb_missfilter;
char *ep = cp + rop->rocb_missfilterlen;
/* Ensure we can access sa_len */
if (m->m_pkthdr.len < sizeof(*rtm) + _SA_MINSIZE)
return EINVAL;
m_copydata(m, sizeof(*rtm) + offsetof(struct sockaddr, sa_len),
sizeof(ss.ss_len), &ss.ss_len);
if (ss.ss_len < _SA_MINSIZE ||
ss.ss_len > sizeof(ss) ||
m->m_pkthdr.len < sizeof(*rtm) + ss.ss_len)
return EINVAL;
/* Copy out the destination sockaddr */
m_copydata(m, sizeof(*rtm), ss.ss_len, &ss);
/* Find a matching sockaddr in the filter */
while (cp < ep) {
sa = (struct sockaddr *)cp;
if (sa->sa_len == dst->sa_len &&
memcmp(sa, dst, sa->sa_len) == 0)
break;
cp += RT_XROUNDUP(sa->sa_len);
}
if (cp == ep)
return EEXIST;
}
/* Passed the filter. */
return 0;
}
static void
rt_pr_init(void)
{
LIST_INIT(&rt_rawcb);
}
static int
COMPATNAME(route_attach)(struct socket *so, int proto)
{
struct rawcb *rp;
struct routecb *rop;
int s, error;
KASSERT(sotorawcb(so) == NULL);
rop = kmem_zalloc(sizeof(*rop), KM_SLEEP);
rp = &rop->rocb_rcb;
rp->rcb_len = sizeof(*rop);
so->so_pcb = rp;
s = splsoftnet();
#ifdef NET_MPSAFE
KASSERT(so->so_lock == NULL);
mutex_obj_hold(rt_so_mtx);
so->so_lock = rt_so_mtx;
solock(so);
#endif
if ((error = raw_attach(so, proto, &rt_rawcb)) == 0) {
rt_adjustcount(rp->rcb_proto.sp_protocol, 1);
rp->rcb_laddr = &COMPATNAME(route_info).ri_src;
rp->rcb_faddr = &COMPATNAME(route_info).ri_dst;
rp->rcb_filter = COMPATNAME(route_filter);
}
splx(s);
if (error) {
kmem_free(rop, sizeof(*rop));
so->so_pcb = NULL;
return error;
}
soisconnected(so);
so->so_options |= SO_USELOOPBACK;
KASSERT(solocked(so));
return error;
}
static void
COMPATNAME(route_detach)(struct socket *so)
{
struct rawcb *rp = sotorawcb(so);
struct routecb *rop = (struct routecb *)rp;
int s;
KASSERT(rp != NULL);
KASSERT(solocked(so));
s = splsoftnet();
if (rop->rocb_missfilterlen != 0)
kmem_free(rop->rocb_missfilter, rop->rocb_missfilterlen);
rt_adjustcount(rp->rcb_proto.sp_protocol, -1);
raw_detach(so);
splx(s);
}
static int
COMPATNAME(route_accept)(struct socket *so, struct sockaddr *nam)
{
KASSERT(solocked(so));
panic("route_accept");
return EOPNOTSUPP;
}
static int
COMPATNAME(route_bind)(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_listen)(struct socket *so, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_connect)(struct socket *so, struct sockaddr *nam, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_connect2)(struct socket *so, struct socket *so2)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_disconnect)(struct socket *so)
{
struct rawcb *rp = sotorawcb(so);
int s;
KASSERT(solocked(so));
KASSERT(rp != NULL);
s = splsoftnet();
soisdisconnected(so);
raw_disconnect(rp);
splx(s);
return 0;
}
static int
COMPATNAME(route_shutdown)(struct socket *so)
{
int s;
KASSERT(solocked(so));
/*
* Mark the connection as being incapable of further input.
*/
s = splsoftnet();
socantsendmore(so);
splx(s);
return 0;
}
static int
COMPATNAME(route_abort)(struct socket *so)
{
KASSERT(solocked(so));
panic("route_abort");
return EOPNOTSUPP;
}
static int
COMPATNAME(route_ioctl)(struct socket *so, u_long cmd, void *nam,
struct ifnet * ifp)
{
return EOPNOTSUPP;
}
static int
COMPATNAME(route_stat)(struct socket *so, struct stat *ub)
{
KASSERT(solocked(so));
return 0;
}
static int
COMPATNAME(route_peeraddr)(struct socket *so, struct sockaddr *nam)
{
struct rawcb *rp = sotorawcb(so);
KASSERT(solocked(so));
KASSERT(rp != NULL);
KASSERT(nam != NULL);
if (rp->rcb_faddr == NULL)
return ENOTCONN;
raw_setpeeraddr(rp, nam);
return 0;
}
static int
COMPATNAME(route_sockaddr)(struct socket *so, struct sockaddr *nam)
{
struct rawcb *rp = sotorawcb(so);
KASSERT(solocked(so));
KASSERT(rp != NULL);
KASSERT(nam != NULL);
if (rp->rcb_faddr == NULL)
return ENOTCONN;
raw_setsockaddr(rp, nam);
return 0;
}
static int
COMPATNAME(route_rcvd)(struct socket *so, int flags, struct lwp *l)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_recvoob)(struct socket *so, struct mbuf *m, int flags)
{
KASSERT(solocked(so));
return EOPNOTSUPP;
}
static int
COMPATNAME(route_send)(struct socket *so, struct mbuf *m,
struct sockaddr *nam, struct mbuf *control, struct lwp *l)
{
int error = 0;
int s;
KASSERT(solocked(so));
KASSERT(so->so_proto == &COMPATNAME(route_protosw)[0]);
s = splsoftnet();
error = raw_send(so, m, nam, control, l, &COMPATNAME(route_output));
splx(s);
return error;
}
static int
COMPATNAME(route_sendoob)(struct socket *so, struct mbuf *m,
struct mbuf *control)
{
KASSERT(solocked(so));
m_freem(m);
m_freem(control);
return EOPNOTSUPP;
}
static int
COMPATNAME(route_purgeif)(struct socket *so, struct ifnet *ifp)
{
panic("route_purgeif");
return EOPNOTSUPP;
}
#if defined(INET) || defined(INET6)
static int
route_get_sdl_index(struct rt_addrinfo *info, int *sdl_index)
{
struct rtentry *nrt;
int error;
error = rtrequest1(RTM_GET, info, &nrt);
if (error != 0)
return error;
/*
* nrt->rt_ifp->if_index may not be correct
* due to changing to ifplo0.
*/
*sdl_index = satosdl(nrt->rt_gateway)->sdl_index;
rt_unref(nrt);
return 0;
}
#endif
static void
route_get_sdl(const struct ifnet *ifp, const struct sockaddr *dst,
struct sockaddr_dl *sdl, int *flags)
{
struct llentry *la;
KASSERT(ifp != NULL);
IF_AFDATA_RLOCK(ifp);
switch (dst->sa_family) {
case AF_INET:
la = lla_lookup(LLTABLE(ifp), 0, dst);
break;
case AF_INET6:
la = lla_lookup(LLTABLE6(ifp), 0, dst);
break;
default:
la = NULL;
KASSERTMSG(0, "Invalid AF=%d\n", dst->sa_family);
break;
}
IF_AFDATA_RUNLOCK(ifp);
void *a = (LLE_IS_VALID(la) && (la->la_flags & LLE_VALID) == LLE_VALID)
? &la->ll_addr : NULL;
a = sockaddr_dl_init(sdl, sizeof(*sdl), ifp->if_index, ifp->if_type,
NULL, 0, a, ifp->if_addrlen);
KASSERT(a != NULL);
if (la != NULL) {
*flags = la->la_flags;
LLE_RUNLOCK(la);
}
}
static int
route_output_report(struct rtentry *rt, struct rt_addrinfo *info,
struct rt_xmsghdr *rtm, struct rt_xmsghdr **new_rtm)
{
int len, error;
if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
const struct ifaddr *rtifa;
const struct ifnet *ifp = rt->rt_ifp;
info->rti_info[RTAX_IFP] = ifp->if_dl->ifa_addr;
/* rtifa used to be simply rt->rt_ifa.
* If rt->rt_ifa != NULL, then
* rt_get_ifa() != NULL. So this
* ought to still be safe. --dyoung
*/
rtifa = rt_get_ifa(rt);
info->rti_info[RTAX_IFA] = rtifa->ifa_addr;
#ifdef RTSOCK_DEBUG
if (info->rti_info[RTAX_IFA]->sa_family == AF_INET) {
char ibuf[INET_ADDRSTRLEN];
char abuf[INET_ADDRSTRLEN];
printf("%s: copying out RTAX_IFA %s "
"for info->rti_info[RTAX_DST] %s "
"ifa_getifa %p ifa_seqno %p\n",
__func__,
RT_IN_PRINT(info, ibuf, RTAX_IFA),
RT_IN_PRINT(info, abuf, RTAX_DST),
(void *)rtifa->ifa_getifa,
rtifa->ifa_seqno);
}
#endif /* RTSOCK_DEBUG */
if (ifp->if_flags & IFF_POINTOPOINT)
info->rti_info[RTAX_BRD] = rtifa->ifa_dstaddr;
else
info->rti_info[RTAX_BRD] = NULL;
rtm->rtm_index = ifp->if_index;
}
error = rt_msg2(rtm->rtm_type, info, NULL, NULL, &len);
if (error)
return error;
if (len > rtm->rtm_msglen) {
struct rt_xmsghdr *old_rtm = rtm;
R_Malloc(*new_rtm, struct rt_xmsghdr *, len);
if (*new_rtm == NULL)
return ENOBUFS;
(void)memcpy(*new_rtm, old_rtm, old_rtm->rtm_msglen);
rtm = *new_rtm;
}
(void)rt_msg2(rtm->rtm_type, info, rtm, NULL, 0);
rtm->rtm_flags = rt->rt_flags;
rtm_setmetrics(rt, rtm);
rtm->rtm_addrs = info->rti_addrs;
return 0;
}
/*ARGSUSED*/
int
COMPATNAME(route_output)(struct mbuf *m, struct socket *so)
{
struct sockproto proto = { .sp_family = PF_XROUTE, };
struct rt_xmsghdr *rtm = NULL;
struct rt_xmsghdr *old_rtm = NULL, *new_rtm = NULL;
struct rtentry *rt = NULL;
struct rtentry *saved_nrt = NULL;
struct rt_addrinfo info;
int len, error = 0;
sa_family_t family;
struct sockaddr_dl sdl;
int bound = curlwp_bind();
bool do_rt_free = false;
struct sockaddr_storage netmask;
#define senderr(e) do { error = e; goto flush;} while (/*CONSTCOND*/ 0)
if (m == NULL || ((m->m_len < sizeof(int32_t)) &&
(m = m_pullup(m, sizeof(int32_t))) == NULL)) {
error = ENOBUFS;
goto out;
}
if ((m->m_flags & M_PKTHDR) == 0)
panic("%s", __func__);
len = m->m_pkthdr.len;
if (len < sizeof(*rtm) ||
len != mtod(m, struct rt_xmsghdr *)->rtm_msglen) {
info.rti_info[RTAX_DST] = NULL;
senderr(EINVAL);
}
R_Malloc(rtm, struct rt_xmsghdr *, len);
if (rtm == NULL) {
info.rti_info[RTAX_DST] = NULL;
senderr(ENOBUFS);
}
m_copydata(m, 0, len, rtm);
if (rtm->rtm_version != RTM_XVERSION) {
info.rti_info[RTAX_DST] = NULL;
senderr(EPROTONOSUPPORT);
}
rtm->rtm_pid = curproc->p_pid;
memset(&info, 0, sizeof(info));
info.rti_addrs = rtm->rtm_addrs;
if (rt_xaddrs(rtm->rtm_type, (const char *)(rtm + 1), len + (char *)rtm,
&info)) {
senderr(EINVAL);
}
info.rti_flags = rtm->rtm_flags;
if (info.rti_info[RTAX_DST] == NULL ||
(info.rti_info[RTAX_DST]->sa_family >= AF_MAX)) {
senderr(EINVAL);
}
#ifdef RTSOCK_DEBUG
if (info.rti_info[RTAX_DST]->sa_family == AF_INET) {
char abuf[INET_ADDRSTRLEN];
printf("%s: extracted info.rti_info[RTAX_DST] %s\n", __func__,
RT_IN_PRINT(&info, abuf, RTAX_DST));
}
#endif /* RTSOCK_DEBUG */
if (info.rti_info[RTAX_GATEWAY] != NULL &&
(info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX)) {
senderr(EINVAL);
}
/*
* Verify that the socket has the appropriate privilege; RTM_GET
* is the only operation the non-superuser is allowed.
*/
if (kauth_authorize_network(so->so_cred, KAUTH_NETWORK_ROUTE,
0, rtm, NULL, NULL) != 0)
senderr(EACCES);
/*
* route(8) passes a sockaddr truncated with prefixlen.
* The kernel doesn't expect such sockaddr and need to
* use a buffer that is big enough for the sockaddr expected
* (padded with 0's). We keep the original length of the sockaddr.
*/
if (info.rti_info[RTAX_NETMASK]) {
/*
* Use the family of RTAX_DST, because RTAX_NETMASK
* can have a zero family if it comes from the radix
* tree via rt_mask().
*/
socklen_t sa_len = sockaddr_getsize_by_family(
info.rti_info[RTAX_DST]->sa_family);
socklen_t masklen = sockaddr_getlen(
info.rti_info[RTAX_NETMASK]);
if (sa_len != 0 && sa_len > masklen) {
KASSERT(sa_len <= sizeof(netmask));
memcpy(&netmask, info.rti_info[RTAX_NETMASK], masklen);
memset((char *)&netmask + masklen, 0, sa_len - masklen);
info.rti_info[RTAX_NETMASK] = sstocsa(&netmask);
}
}
switch (rtm->rtm_type) {
case RTM_ADD:
if (info.rti_info[RTAX_GATEWAY] == NULL) {
senderr(EINVAL);
}
#if defined(INET) || defined(INET6)
/* support for new ARP/NDP code with keeping backcompat */
if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) {
const struct sockaddr_dl *sdlp =
satocsdl(info.rti_info[RTAX_GATEWAY]);
/* Allow routing requests by interface index */
if (sdlp->sdl_nlen == 0 && sdlp->sdl_alen == 0
&& sdlp->sdl_slen == 0)
goto fallback;
/*
* Old arp binaries don't set the sdl_index
* so we have to complement it.
*/
int sdl_index = sdlp->sdl_index;
if (sdl_index == 0) {
error = route_get_sdl_index(&info, &sdl_index);
if (error != 0)
goto fallback;
} else if (
info.rti_info[RTAX_DST]->sa_family == AF_INET) {
/*
* XXX workaround for SIN_PROXY case; proxy arp
* entry should be in an interface that has
* a network route including the destination,
* not a local (link) route that may not be a
* desired place, for example a tap.
*/
const struct sockaddr_inarp *sina =
(const struct sockaddr_inarp *)
info.rti_info[RTAX_DST];
if (sina->sin_other & SIN_PROXY) {
error = route_get_sdl_index(&info,
&sdl_index);
if (error != 0)
goto fallback;
}
}
error = lla_rt_output(rtm->rtm_type, rtm->rtm_flags,
rtm->rtm_rmx.rmx_expire, &info, sdl_index);
break;
}
fallback:
#endif /* defined(INET) || defined(INET6) */
error = rtrequest1(rtm->rtm_type, &info, &saved_nrt);
if (error == 0) {
_rt_setmetrics(rtm->rtm_inits, rtm, saved_nrt);
rt_unref(saved_nrt);
}
break;
case RTM_DELETE:
#if defined(INET) || defined(INET6)
/* support for new ARP/NDP code */
if (info.rti_info[RTAX_GATEWAY] &&
(info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
(rtm->rtm_flags & RTF_LLDATA) != 0) {
const struct sockaddr_dl *sdlp =
satocsdl(info.rti_info[RTAX_GATEWAY]);
error = lla_rt_output(rtm->rtm_type, rtm->rtm_flags,
rtm->rtm_rmx.rmx_expire, &info, sdlp->sdl_index);
rtm->rtm_flags &= ~RTF_UP;
break;
}
#endif
error = rtrequest1(rtm->rtm_type, &info, &saved_nrt);
if (error != 0)
break;
rt = saved_nrt;
do_rt_free = true;
info.rti_info[RTAX_DST] = rt_getkey(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_TAG] = rt_gettag(rt);
error = route_output_report(rt, &info, rtm, &new_rtm);
if (error)
senderr(error);
if (new_rtm != NULL) {
old_rtm = rtm;
rtm = new_rtm;
}
break;
case RTM_GET:
case RTM_CHANGE:
case RTM_LOCK:
/* XXX This will mask info.rti_info[RTAX_DST] with
* info.rti_info[RTAX_NETMASK] before
* searching. It did not used to do that. --dyoung
*/
rt = NULL;
error = rtrequest1(RTM_GET, &info, &rt);
if (error != 0)
senderr(error);
if (rtm->rtm_type != RTM_GET) {/* XXX: too grotty */
if (memcmp(info.rti_info[RTAX_DST], rt_getkey(rt),
info.rti_info[RTAX_DST]->sa_len) != 0)
senderr(ESRCH);
if (info.rti_info[RTAX_NETMASK] == NULL &&
rt_mask(rt) != NULL)
senderr(ETOOMANYREFS);
}
/*
* XXX if arp/ndp requests an L2 entry, we have to obtain
* it from lltable while for the route command we have to
* return a route as it is. How to distinguish them?
* For newer arp/ndp, RTF_LLDATA flag set by arp/ndp
* indicates an L2 entry is requested. For old arp/ndp
* binaries, we check RTF_UP flag is NOT set; it works
* by the fact that arp/ndp don't set it while the route
* command sets it.
*/
if (((rtm->rtm_flags & RTF_LLDATA) != 0 ||
(rtm->rtm_flags & RTF_UP) == 0) &&
rtm->rtm_type == RTM_GET &&
sockaddr_cmp(rt_getkey(rt), info.rti_info[RTAX_DST]) != 0) {
int ll_flags = 0;
route_get_sdl(rt->rt_ifp, info.rti_info[RTAX_DST], &sdl,
&ll_flags);
info.rti_info[RTAX_GATEWAY] = sstocsa(&sdl);
error = route_output_report(rt, &info, rtm, &new_rtm);
if (error)
senderr(error);
if (new_rtm != NULL) {
old_rtm = rtm;
rtm = new_rtm;
}
rtm->rtm_flags |= RTF_LLDATA;
rtm->rtm_flags &= ~RTF_CONNECTED;
rtm->rtm_flags |= (ll_flags & LLE_STATIC) ? RTF_STATIC : 0;
break;
}
switch (rtm->rtm_type) {
case RTM_GET:
info.rti_info[RTAX_DST] = rt_getkey(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_TAG] = rt_gettag(rt);
error = route_output_report(rt, &info, rtm, &new_rtm);
if (error)
senderr(error);
if (new_rtm != NULL) {
old_rtm = rtm;
rtm = new_rtm;
}
break;
case RTM_CHANGE:
#ifdef NET_MPSAFE
/*
* Release rt_so_mtx to avoid a deadlock with route_intr
* and also serialize updating routes to avoid another.
*/
if (rt_updating) {
/* Release to allow the updater to proceed */
rt_unref(rt);
rt = NULL;
}
while (rt_updating) {
error = cv_wait_sig(&rt_update_cv, rt_so_mtx);
if (error != 0)
goto flush;
}
if (rt == NULL) {
error = rtrequest1(RTM_GET, &info, &rt);
if (error != 0)
goto flush;
}
rt_updating = true;
mutex_exit(rt_so_mtx);
error = rt_update_prepare(rt);
if (error == 0) {
error = rt_update(rt, &info, rtm);
rt_update_finish(rt);
}
mutex_enter(rt_so_mtx);
rt_updating = false;
cv_broadcast(&rt_update_cv);
#else
error = rt_update(rt, &info, rtm);
#endif
if (error != 0)
goto flush;
/*FALLTHROUGH*/
case RTM_LOCK:
rt->rt_rmx.rmx_locks &= ~(rtm->rtm_inits);
rt->rt_rmx.rmx_locks |=
(rtm->rtm_inits & rtm->rtm_rmx.rmx_locks);
break;
}
break;
default:
senderr(EOPNOTSUPP);
}
flush:
if (rtm) {
if (error)
rtm->rtm_errno = error;
else
rtm->rtm_flags |= RTF_DONE;
}
family = info.rti_info[RTAX_DST] ? info.rti_info[RTAX_DST]->sa_family :
0;
/* We cannot free old_rtm until we have stopped using the
* pointers in info, some of which may point to sockaddrs
* in old_rtm.
*/
if (old_rtm != NULL)
Free(old_rtm);
if (rt) {
if (do_rt_free) {
#ifdef NET_MPSAFE
/*
* Release rt_so_mtx to avoid a deadlock with
* route_intr.
*/
mutex_exit(rt_so_mtx);
rt_free(rt);
mutex_enter(rt_so_mtx);
#else
rt_free(rt);
#endif
} else
rt_unref(rt);
}
{
struct rawcb *rp = NULL;
/*
* Check to see if we don't want our own messages.
*/
if ((so->so_options & SO_USELOOPBACK) == 0) {
if (COMPATNAME(route_info).ri_cb.any_count <= 1) {
if (rtm)
Free(rtm);
m_freem(m);
goto out;
}
/* There is another listener, so construct message */
rp = sotorawcb(so);
}
if (rtm) {
m_copyback(m, 0, rtm->rtm_msglen, rtm);
if (m->m_pkthdr.len < rtm->rtm_msglen) {
m_freem(m);
m = NULL;
} else if (m->m_pkthdr.len > rtm->rtm_msglen)