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f-stack/lib/ff_route.c

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/*
* Copyright (c) 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
* Copyright (C) 2017 THL A29 Limited, a Tencent company.
* 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.
* 4. 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.
*
* Copied part from FreeBSD rtsock.c.
*
*/
#include <sys/param.h>
#include <sys/proc.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/domain.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_llatbl.h>
#include <net/if_types.h>
#include <net/route.h>
#include <net/route_var.h>
#include <netinet/if_ether.h>
#include "ff_api.h"
#include "ff_host_interface.h"
#ifndef _SOCKADDR_UNION_DEFINED
#define _SOCKADDR_UNION_DEFINED
/*
* The union of all possible address formats we handle.
*/
union sockaddr_union {
struct sockaddr sa;
struct sockaddr_in sin;
struct sockaddr_in6 sin6;
};
#endif /* _SOCKADDR_UNION_DEFINED */
static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, };
struct walkarg {
int w_tmemsize;
int w_op, w_arg;
caddr_t w_tmem;
struct sysctl_req *w_req;
};
static int
rtm_get_jailed(struct rt_addrinfo *info, struct ifnet *ifp,
struct rtentry *rt, union sockaddr_union *saun, struct ucred *cred)
{
/* First, see if the returned address is part of the jail. */
if (prison_if(cred, rt->rt_ifa->ifa_addr) == 0) {
info->rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
return (0);
}
switch (info->rti_info[RTAX_DST]->sa_family) {
#ifdef INET
case AF_INET:
{
struct in_addr ia;
struct ifaddr *ifa;
int found;
found = 0;
/*
* Try to find an address on the given outgoing interface
* that belongs to the jail.
*/
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
struct sockaddr *sa;
sa = ifa->ifa_addr;
if (sa->sa_family != AF_INET)
continue;
ia = ((struct sockaddr_in *)sa)->sin_addr;
if (prison_check_ip4(cred, &ia) == 0) {
found = 1;
break;
}
}
IF_ADDR_RUNLOCK(ifp);
if (!found) {
/*
* As a last resort return the 'default' jail address.
*/
ia = ((struct sockaddr_in *)rt->rt_ifa->ifa_addr)->
sin_addr;
if (prison_get_ip4(cred, &ia) != 0)
return (ESRCH);
}
bzero(&saun->sin, sizeof(struct sockaddr_in));
saun->sin.sin_len = sizeof(struct sockaddr_in);
saun->sin.sin_family = AF_INET;
saun->sin.sin_addr.s_addr = ia.s_addr;
info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin;
break;
}
#endif
#ifdef INET6
case AF_INET6:
{
struct in6_addr ia6;
struct ifaddr *ifa;
int found;
found = 0;
/*
* Try to find an address on the given outgoing interface
* that belongs to the jail.
*/
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
struct sockaddr *sa;
sa = ifa->ifa_addr;
if (sa->sa_family != AF_INET6)
continue;
bcopy(&((struct sockaddr_in6 *)sa)->sin6_addr,
&ia6, sizeof(struct in6_addr));
if (prison_check_ip6(cred, &ia6) == 0) {
found = 1;
break;
}
}
IF_ADDR_RUNLOCK(ifp);
if (!found) {
/*
* As a last resort return the 'default' jail address.
*/
ia6 = ((struct sockaddr_in6 *)rt->rt_ifa->ifa_addr)->
sin6_addr;
if (prison_get_ip6(cred, &ia6) != 0)
return (ESRCH);
}
bzero(&saun->sin6, sizeof(struct sockaddr_in6));
saun->sin6.sin6_len = sizeof(struct sockaddr_in6);
saun->sin6.sin6_family = AF_INET6;
bcopy(&ia6, &saun->sin6.sin6_addr, sizeof(struct in6_addr));
if (sa6_recoverscope(&saun->sin6) != 0)
return (ESRCH);
info->rti_info[RTAX_IFA] = (struct sockaddr *)&saun->sin6;
break;
}
#endif
default:
return (ESRCH);
}
return (0);
}
/*
* Extract the addresses of the passed sockaddrs.
* Do a little sanity checking so as to avoid bad memory references.
* This data is derived straight from userland.
*/
static int
rt_xaddrs(caddr_t cp, caddr_t cplim, struct rt_addrinfo *rtinfo)
{
struct sockaddr *sa;
int i;
for (i = 0; i < RTAX_MAX && cp < cplim; i++) {
if ((rtinfo->rti_addrs & (1 << i)) == 0)
continue;
sa = (struct sockaddr *)cp;
/*
* It won't fit.
*/
if (cp + sa->sa_len > cplim)
return (EINVAL);
/*
* there are no more.. quit now
* If there are more bits, they are in error.
* I've seen this. route(1) can evidently generate these.
* This causes kernel to core dump.
* for compatibility, If we see this, point to a safe address.
*/
if (sa->sa_len == 0) {
rtinfo->rti_info[i] = &sa_zero;
return (0); /* should be EINVAL but for compat */
}
/* accept it */
#ifdef INET6
if (sa->sa_family == AF_INET6)
sa6_embedscope((struct sockaddr_in6 *)sa,
V_ip6_use_defzone);
#endif
rtinfo->rti_info[i] = sa;
cp += SA_SIZE(sa);
}
return (0);
}
/*
* Writes information related to @rtinfo object to preallocated buffer.
* Stores needed size in @plen. If @w is NULL, calculates size without
* writing.
* Used for sysctl dumps and rtsock answers (RTM_DEL/RTM_GET) generation.
*
* Returns 0 on success.
*
*/
static int
rtsock_msg_buffer(int type, struct rt_addrinfo *rtinfo, struct walkarg *w, int *plen)
{
int i;
int len, buflen = 0, dlen;
caddr_t cp = NULL;
struct rt_msghdr *rtm = NULL;
#ifdef INET6
struct sockaddr_storage ss;
struct sockaddr_in6 *sin6;
#endif
switch (type) {
case RTM_DELADDR:
case RTM_NEWADDR:
if (w != NULL && w->w_op == NET_RT_IFLISTL) {
#ifdef COMPAT_FREEBSD32
if (w->w_req->flags & SCTL_MASK32)
len = sizeof(struct ifa_msghdrl32);
else
#endif
len = sizeof(struct ifa_msghdrl);
} else
len = sizeof(struct ifa_msghdr);
break;
case RTM_IFINFO:
#ifdef COMPAT_FREEBSD32
if (w != NULL && w->w_req->flags & SCTL_MASK32) {
if (w->w_op == NET_RT_IFLISTL)
len = sizeof(struct if_msghdrl32);
else
len = sizeof(struct if_msghdr32);
break;
}
#endif
if (w != NULL && w->w_op == NET_RT_IFLISTL)
len = sizeof(struct if_msghdrl);
else
len = sizeof(struct if_msghdr);
break;
case RTM_NEWMADDR:
len = sizeof(struct ifma_msghdr);
break;
default:
len = sizeof(struct rt_msghdr);
}
if (w != NULL) {
rtm = (struct rt_msghdr *)w->w_tmem;
buflen = w->w_tmemsize - len;
cp = (caddr_t)w->w_tmem + len;
}
rtinfo->rti_addrs = 0;
for (i = 0; i < RTAX_MAX; i++) {
struct sockaddr *sa;
if ((sa = rtinfo->rti_info[i]) == NULL)
continue;
rtinfo->rti_addrs |= (1 << i);
dlen = SA_SIZE(sa);
if (cp != NULL && buflen >= dlen) {
#ifdef INET6
if (V_deembed_scopeid && sa->sa_family == AF_INET6) {
sin6 = (struct sockaddr_in6 *)&ss;
bcopy(sa, sin6, sizeof(*sin6));
if (sa6_recoverscope(sin6) == 0)
sa = (struct sockaddr *)sin6;
}
#endif
bcopy((caddr_t)sa, cp, (unsigned)dlen);
cp += dlen;
buflen -= dlen;
} else if (cp != NULL) {
/*
* Buffer too small. Count needed size
* and return with error.
*/
cp = NULL;
}
len += dlen;
}
if (cp != NULL) {
dlen = ALIGN(len) - len;
if (buflen < dlen)
cp = NULL;
else
buflen -= dlen;
}
len = ALIGN(len);
if (cp != NULL) {
/* fill header iff buffer is large enough */
rtm->rtm_version = RTM_VERSION;
rtm->rtm_type = type;
rtm->rtm_msglen = len;
}
*plen = len;
if (w != NULL && cp == NULL)
return (ENOBUFS);
return (0);
}
/*
* Fill in @dmask with valid netmask leaving original @smask
* intact. Mostly used with radix netmasks.
*/
static struct sockaddr *
rtsock_fix_netmask(struct sockaddr *dst, struct sockaddr *smask,
struct sockaddr_storage *dmask)
{
if (dst == NULL || smask == NULL)
return (NULL);
memset(dmask, 0, dst->sa_len);
memcpy(dmask, smask, smask->sa_len);
dmask->ss_len = dst->sa_len;
dmask->ss_family = dst->sa_family;
return ((struct sockaddr *)dmask);
}
static void
rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out)
{
bzero(out, sizeof(*out));
out->rmx_mtu = rt->rt_mtu;
out->rmx_weight = rt->rt_weight;
out->rmx_pksent = counter_u64_fetch(rt->rt_pksent);
/* Kernel -> userland timebase conversion. */
out->rmx_expire = rt->rt_expire ?
rt->rt_expire - time_uptime + time_second : 0;
}
int
ff_rtioctl(int fibnum, void *data, unsigned *plen, unsigned maxlen)
{
struct rt_msghdr *rtm = NULL;
struct rtentry *rt = NULL;
struct rib_head *rnh;
struct rt_addrinfo info;
union sockaddr_union saun;
sa_family_t saf = AF_UNSPEC;
struct sockaddr_storage ss;
struct walkarg w;
int error = 0, alloc_len = 0, len;
struct ifnet *ifp = NULL;
#ifdef INET6
struct sockaddr_in6 *sin6;
int i, rti_need_deembed = 0;
#endif
#define senderr(e) { error = e; goto flush;}
len = *plen;
/*
* Most of current messages are in range 200-240 bytes,
* minimize possible re-allocation on reply using larger size
* buffer aligned on 1k boundaty.
*/
alloc_len = roundup2(len, 1024);
if ((rtm = malloc(alloc_len, M_TEMP, M_NOWAIT)) == NULL)
senderr(ENOBUFS);
bcopy(data, (caddr_t)rtm, len);
if (len < sizeof(*rtm) || len != rtm->rtm_msglen)
senderr(EINVAL);
bzero(&info, sizeof(info));
bzero(&w, sizeof(w));
if (rtm->rtm_version != RTM_VERSION)
senderr(EPROTONOSUPPORT);
/*
* Starting from here, it is possible
* to alter original message and insert
* caller PID and error value.
*/
rtm->rtm_pid = curproc->p_pid;
info.rti_addrs = rtm->rtm_addrs;
info.rti_mflags = rtm->rtm_inits;
info.rti_rmx = &rtm->rtm_rmx;
/*
* rt_xaddrs() performs s6_addr[2] := sin6_scope_id for AF_INET6
* link-local address because rtrequest requires addresses with
* embedded scope id.
*/
if (rt_xaddrs((caddr_t)(rtm + 1), len + (caddr_t)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 ||
(info.rti_info[RTAX_GATEWAY] != NULL &&
info.rti_info[RTAX_GATEWAY]->sa_family >= AF_MAX))
senderr(EINVAL);
saf = info.rti_info[RTAX_DST]->sa_family;
/*
* The given gateway address may be an interface address.
* For example, issuing a "route change" command on a route
* entry that was created from a tunnel, and the gateway
* address given is the local end point. In this case the
* RTF_GATEWAY flag must be cleared or the destination will
* not be reachable even though there is no error message.
*/
if (info.rti_info[RTAX_GATEWAY] != NULL &&
info.rti_info[RTAX_GATEWAY]->sa_family != AF_LINK) {
struct rt_addrinfo ginfo;
struct sockaddr *gdst;
bzero(&ginfo, sizeof(ginfo));
bzero(&ss, sizeof(ss));
ss.ss_len = sizeof(ss);
ginfo.rti_info[RTAX_GATEWAY] = (struct sockaddr *)&ss;
gdst = info.rti_info[RTAX_GATEWAY];
/*
* A host route through the loopback interface is
* installed for each interface adddress. In pre 8.0
* releases the interface address of a PPP link type
* is not reachable locally. This behavior is fixed as
* part of the new L2/L3 redesign and rewrite work. The
* signature of this interface address route is the
* AF_LINK sa_family type of the rt_gateway, and the
* rt_ifp has the IFF_LOOPBACK flag set.
*/
if (rib_lookup_info(fibnum, gdst, NHR_REF, 0, &ginfo) == 0) {
if (ss.ss_family == AF_LINK &&
ginfo.rti_ifp->if_flags & IFF_LOOPBACK) {
info.rti_flags &= ~RTF_GATEWAY;
info.rti_flags |= RTF_GWFLAG_COMPAT;
}
rib_free_info(&ginfo);
}
}
switch (rtm->rtm_type) {
struct rtentry *saved_nrt;
case RTM_ADD:
case RTM_CHANGE:
if (info.rti_info[RTAX_GATEWAY] == NULL)
senderr(EINVAL);
saved_nrt = NULL;
/* support for new ARP code */
if (info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK &&
(rtm->rtm_flags & RTF_LLDATA) != 0) {
error = lla_rt_output(rtm, &info);
#ifdef INET6
if (error == 0)
rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
#endif
break;
}
error = rtrequest1_fib(rtm->rtm_type, &info, &saved_nrt,
fibnum);
if (error == 0 && saved_nrt != NULL) {
#ifdef INET6
rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
#endif
RT_LOCK(saved_nrt);
rtm->rtm_index = saved_nrt->rt_ifp->if_index;
RT_REMREF(saved_nrt);
RT_UNLOCK(saved_nrt);
}
break;
case RTM_DELETE:
saved_nrt = NULL;
/* support for new ARP code */
if (info.rti_info[RTAX_GATEWAY] &&
(info.rti_info[RTAX_GATEWAY]->sa_family == AF_LINK) &&
(rtm->rtm_flags & RTF_LLDATA) != 0) {
error = lla_rt_output(rtm, &info);
#ifdef INET6
if (error == 0)
rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
#endif
break;
}
error = rtrequest1_fib(RTM_DELETE, &info, &saved_nrt, fibnum);
if (error == 0) {
RT_LOCK(saved_nrt);
rt = saved_nrt;
goto report;
}
#ifdef INET6
/* rt_msg2() will not be used when RTM_DELETE fails. */
rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
#endif
break;
case RTM_GET:
rnh = rt_tables_get_rnh(fibnum, saf);
if (rnh == NULL)
senderr(EAFNOSUPPORT);
RIB_RLOCK(rnh);
if (info.rti_info[RTAX_NETMASK] == NULL &&
rtm->rtm_type == RTM_GET) {
/*
* Provide logest prefix match for
* address lookup (no mask).
* 'route -n get addr'
*/
rt = (struct rtentry *) rnh->rnh_matchaddr(
info.rti_info[RTAX_DST], &rnh->head);
} else
rt = (struct rtentry *) rnh->rnh_lookup(
info.rti_info[RTAX_DST],
info.rti_info[RTAX_NETMASK], &rnh->head);
if (rt == NULL) {
RIB_RUNLOCK(rnh);
senderr(ESRCH);
}
#ifdef RADIX_MPATH
/*
* for RTM_CHANGE/LOCK, if we got multipath routes,
* we require users to specify a matching RTAX_GATEWAY.
*
* for RTM_GET, gate is optional even with multipath.
* if gate == NULL the first match is returned.
* (no need to call rt_mpath_matchgate if gate == NULL)
*/
if (rt_mpath_capable(rnh) &&
(rtm->rtm_type != RTM_GET || info.rti_info[RTAX_GATEWAY])) {
rt = rt_mpath_matchgate(rt, info.rti_info[RTAX_GATEWAY]);
if (!rt) {
RIB_RUNLOCK(rnh);
senderr(ESRCH);
}
}
#endif
/*
* If performing proxied L2 entry insertion, and
* the actual PPP host entry is found, perform
* another search to retrieve the prefix route of
* the local end point of the PPP link.
*/
if (rtm->rtm_flags & RTF_ANNOUNCE) {
struct sockaddr laddr;
if (rt->rt_ifp != NULL &&
rt->rt_ifp->if_type == IFT_PROPVIRTUAL) {
struct ifaddr *ifa;
ifa = ifa_ifwithnet(info.rti_info[RTAX_DST], 1,
RT_ALL_FIBS);
if (ifa != NULL)
rt_maskedcopy(ifa->ifa_addr,
&laddr,
ifa->ifa_netmask);
} else
rt_maskedcopy(rt->rt_ifa->ifa_addr,
&laddr,
rt->rt_ifa->ifa_netmask);
/*
* refactor rt and no lock operation necessary
*/
rt = (struct rtentry *)rnh->rnh_matchaddr(&laddr,
&rnh->head);
if (rt == NULL) {
RIB_RUNLOCK(rnh);
senderr(ESRCH);
}
}
RT_LOCK(rt);
RT_ADDREF(rt);
RIB_RUNLOCK(rnh);
report:
RT_LOCK_ASSERT(rt);
if ((rt->rt_flags & RTF_HOST) == 0
? jailed_without_vnet(curthread->td_ucred)
: prison_if(curthread->td_ucred,
rt_key(rt)) != 0) {
RT_UNLOCK(rt);
senderr(ESRCH);
}
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rtsock_fix_netmask(rt_key(rt),
rt_mask(rt), &ss);
info.rti_info[RTAX_GENMASK] = 0;
if (rtm->rtm_addrs & (RTA_IFP | RTA_IFA)) {
ifp = rt->rt_ifp;
if (ifp) {
info.rti_info[RTAX_IFP] =
ifp->if_addr->ifa_addr;
error = rtm_get_jailed(&info, ifp, rt,
&saun, curthread->td_ucred);
if (error != 0) {
RT_UNLOCK(rt);
senderr(error);
}
if (ifp->if_flags & IFF_POINTOPOINT)
info.rti_info[RTAX_BRD] =
rt->rt_ifa->ifa_dstaddr;
rtm->rtm_index = ifp->if_index;
} else {
info.rti_info[RTAX_IFP] = NULL;
info.rti_info[RTAX_IFA] = NULL;
}
} else if ((ifp = rt->rt_ifp) != NULL) {
rtm->rtm_index = ifp->if_index;
}
/* Check if we need to realloc storage */
rtsock_msg_buffer(rtm->rtm_type, &info, NULL, &len);
if (len > maxlen) {
RT_UNLOCK(rt);
senderr(ENOBUFS);
}
if (len > alloc_len) {
struct rt_msghdr *new_rtm;
new_rtm = malloc(len, M_TEMP, M_NOWAIT);
if (new_rtm == NULL) {
RT_UNLOCK(rt);
senderr(ENOBUFS);
}
bcopy(rtm, new_rtm, rtm->rtm_msglen);
free(rtm, M_TEMP);
rtm = new_rtm;
alloc_len = len;
}
w.w_tmem = (caddr_t)rtm;
w.w_tmemsize = alloc_len;
rtsock_msg_buffer(rtm->rtm_type, &info, &w, &len);
if (rt->rt_flags & RTF_GWFLAG_COMPAT)
rtm->rtm_flags = RTF_GATEWAY |
(rt->rt_flags & ~RTF_GWFLAG_COMPAT);
else
rtm->rtm_flags = rt->rt_flags;
rt_getmetrics(rt, &rtm->rtm_rmx);
rtm->rtm_addrs = info.rti_addrs;
RT_UNLOCK(rt);
break;
default:
senderr(EOPNOTSUPP);
}
flush:
if (rt != NULL)
RTFREE(rt);
if (rtm != NULL) {
#ifdef INET6
if (rti_need_deembed) {
/* sin6_scope_id is recovered before sending rtm. */
sin6 = (struct sockaddr_in6 *)&ss;
for (i = 0; i < RTAX_MAX; i++) {
if (info.rti_info[i] == NULL)
continue;
if (info.rti_info[i]->sa_family != AF_INET6)
continue;
bcopy(info.rti_info[i], sin6, sizeof(*sin6));
if (sa6_recoverscope(sin6) == 0)
bcopy(sin6, info.rti_info[i],
sizeof(*sin6));
}
}
#endif
if (error != 0)
rtm->rtm_errno = error;
else
rtm->rtm_flags |= RTF_DONE;
bcopy((caddr_t)rtm, data, rtm->rtm_msglen);
*plen = rtm->rtm_msglen;
free(rtm, M_TEMP);
}
if (error != 0) {
ff_os_errno(error);
return (-1);
}
return (error);
}
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