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freebsd-dev/sys/net/route.c
Alexander V. Chernikov 34a5582c47 Bring back redirect route expiration. 
Redirect (and temporal) route expiration was broken a while ago.
This change brings route expiration back, with unified IPv4/IPv6 handling code.

It introduces net.inet.icmp.redirtimeout sysctl, allowing to set
 an expiration time for redirected routes. It defaults to 10 minutes,
 analogues with net.inet6.icmp6.redirtimeout.

Implementation uses separate file, route_temporal.c, as route.c is already
 bloated with tons of different functions.
Internally, expiration is implemented as an per-rnh callout scheduled when
 route with non-zero rt_expire time is added or rt_expire is changed.
 It does not add any overhead when no temporal routes are present.

Callout traverses entire routing tree under wlock, scheduling expired routes
 for deletion and calculating the next time it needs to be run. The rationale
 for such implemention is the following: typically workloads requiring large
 amount of routes have redirects turned off already, while the systems with
 small amount of routes will not inhibit large overhead during tree traversal.

This changes also fixes netstat -rn display of route expiration time, which
 has been broken since the conversion from kread() to sysctl.

Reviewed by:	bz
MFC after:	3 weeks
Differential Revision:	https://reviews.freebsd.org/D23075
2020-01-22 13:53:18 +00:00

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/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1980, 1986, 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.
*
* @(#)route.c 8.3.1.1 (Berkeley) 2/23/95
* $FreeBSD$
*/
/************************************************************************
* Note: In this file a 'fib' is a "forwarding information base" *
* Which is the new name for an in kernel routing (next hop) table. *
***********************************************************************/
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_mrouting.h"
#include "opt_mpath.h"
#include "opt_route.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/syslog.h>
#include <sys/sysproto.h>
#include <sys/proc.h>
#include <sys/domain.h>
#include <sys/eventhandler.h>
#include <sys/kernel.h>
#include <sys/lock.h>
#include <sys/rmlock.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/route_var.h>
#include <net/vnet.h>
#ifdef RADIX_MPATH
#include <net/radix_mpath.h>
#endif
#include <netinet/in.h>
#include <netinet/ip_mroute.h>
#include <vm/uma.h>
#define RT_MAXFIBS UINT16_MAX
/* Kernel config default option. */
#ifdef ROUTETABLES
#if ROUTETABLES <= 0
#error "ROUTETABLES defined too low"
#endif
#if ROUTETABLES > RT_MAXFIBS
#error "ROUTETABLES defined too big"
#endif
#define RT_NUMFIBS ROUTETABLES
#endif /* ROUTETABLES */
/* Initialize to default if not otherwise set. */
#ifndef RT_NUMFIBS
#define RT_NUMFIBS 1
#endif
/* This is read-only.. */
u_int rt_numfibs = RT_NUMFIBS;
SYSCTL_UINT(_net, OID_AUTO, fibs, CTLFLAG_RDTUN, &rt_numfibs, 0, "");
/*
* By default add routes to all fibs for new interfaces.
* Once this is set to 0 then only allocate routes on interface
* changes for the FIB of the caller when adding a new set of addresses
* to an interface. XXX this is a shotgun aproach to a problem that needs
* a more fine grained solution.. that will come.
* XXX also has the problems getting the FIB from curthread which will not
* always work given the fib can be overridden and prefixes can be added
* from the network stack context.
*/
VNET_DEFINE(u_int, rt_add_addr_allfibs) = 1;
SYSCTL_UINT(_net, OID_AUTO, add_addr_allfibs, CTLFLAG_RWTUN | CTLFLAG_VNET,
&VNET_NAME(rt_add_addr_allfibs), 0, "");
VNET_PCPUSTAT_DEFINE_STATIC(struct rtstat, rtstat);
#define RTSTAT_ADD(name, val) \
VNET_PCPUSTAT_ADD(struct rtstat, rtstat, name, (val))
#define RTSTAT_INC(name) RTSTAT_ADD(name, 1)
VNET_PCPUSTAT_SYSINIT(rtstat);
#ifdef VIMAGE
VNET_PCPUSTAT_SYSUNINIT(rtstat);
#endif
VNET_DEFINE(struct rib_head *, rt_tables);
#define V_rt_tables VNET(rt_tables)
VNET_DEFINE(int, rttrash); /* routes not in table but not freed */
#define V_rttrash VNET(rttrash)
/*
* Convert a 'struct radix_node *' to a 'struct rtentry *'.
* The operation can be done safely (in this code) because a
* 'struct rtentry' starts with two 'struct radix_node''s, the first
* one representing leaf nodes in the routing tree, which is
* what the code in radix.c passes us as a 'struct radix_node'.
*
* But because there are a lot of assumptions in this conversion,
* do not cast explicitly, but always use the macro below.
*/
#define RNTORT(p) ((struct rtentry *)(p))
VNET_DEFINE_STATIC(uma_zone_t, rtzone); /* Routing table UMA zone. */
#define V_rtzone VNET(rtzone)
EVENTHANDLER_LIST_DEFINE(rt_addrmsg);
static int rt_getifa_fib(struct rt_addrinfo *, u_int);
static int rtrequest1_fib_change(struct rib_head *, struct rt_addrinfo *,
struct rtentry **, u_int);
static void rt_setmetrics(const struct rt_addrinfo *, struct rtentry *);
static int rt_ifdelroute(const struct rtentry *rt, void *arg);
static struct rtentry *rt_unlinkrte(struct rib_head *rnh,
struct rt_addrinfo *info, int *perror);
static void rt_notifydelete(struct rtentry *rt, struct rt_addrinfo *info);
#ifdef RADIX_MPATH
static struct radix_node *rt_mpath_unlink(struct rib_head *rnh,
struct rt_addrinfo *info, struct rtentry *rto, int *perror);
#endif
static int rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info,
int flags);
struct if_mtuinfo
{
struct ifnet *ifp;
int mtu;
};
static int if_updatemtu_cb(struct radix_node *, void *);
/*
* handler for net.my_fibnum
*/
static int
sysctl_my_fibnum(SYSCTL_HANDLER_ARGS)
{
int fibnum;
int error;
fibnum = curthread->td_proc->p_fibnum;
error = sysctl_handle_int(oidp, &fibnum, 0, req);
return (error);
}
SYSCTL_PROC(_net, OID_AUTO, my_fibnum, CTLTYPE_INT|CTLFLAG_RD,
NULL, 0, &sysctl_my_fibnum, "I", "default FIB of caller");
static __inline struct rib_head **
rt_tables_get_rnh_ptr(int table, int fam)
{
struct rib_head **rnh;
KASSERT(table >= 0 && table < rt_numfibs,
("%s: table out of bounds (0 <= %d < %d)", __func__, table,
rt_numfibs));
KASSERT(fam >= 0 && fam < (AF_MAX + 1),
("%s: fam out of bounds (0 <= %d < %d)", __func__, fam, AF_MAX+1));
/* rnh is [fib=0][af=0]. */
rnh = (struct rib_head **)V_rt_tables;
/* Get the offset to the requested table and fam. */
rnh += table * (AF_MAX+1) + fam;
return (rnh);
}
struct rib_head *
rt_tables_get_rnh(int table, int fam)
{
return (*rt_tables_get_rnh_ptr(table, fam));
}
u_int
rt_tables_get_gen(int table, int fam)
{
struct rib_head *rnh;
rnh = *rt_tables_get_rnh_ptr(table, fam);
KASSERT(rnh != NULL, ("%s: NULL rib_head pointer table %d fam %d",
__func__, table, fam));
return (rnh->rnh_gen);
}
/*
* route initialization must occur before ip6_init2(), which happenas at
* SI_ORDER_MIDDLE.
*/
static void
route_init(void)
{
/* whack the tunable ints into line. */
if (rt_numfibs > RT_MAXFIBS)
rt_numfibs = RT_MAXFIBS;
if (rt_numfibs == 0)
rt_numfibs = 1;
}
SYSINIT(route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, route_init, NULL);
static int
rtentry_zinit(void *mem, int size, int how)
{
struct rtentry *rt = mem;
rt->rt_pksent = counter_u64_alloc(how);
if (rt->rt_pksent == NULL)
return (ENOMEM);
RT_LOCK_INIT(rt);
return (0);
}
static void
rtentry_zfini(void *mem, int size)
{
struct rtentry *rt = mem;
RT_LOCK_DESTROY(rt);
counter_u64_free(rt->rt_pksent);
}
static int
rtentry_ctor(void *mem, int size, void *arg, int how)
{
struct rtentry *rt = mem;
bzero(rt, offsetof(struct rtentry, rt_endzero));
counter_u64_zero(rt->rt_pksent);
rt->rt_chain = NULL;
return (0);
}
static void
rtentry_dtor(void *mem, int size, void *arg)
{
struct rtentry *rt = mem;
RT_UNLOCK_COND(rt);
}
static void
vnet_route_init(const void *unused __unused)
{
struct domain *dom;
struct rib_head **rnh;
int table;
int fam;
V_rt_tables = malloc(rt_numfibs * (AF_MAX+1) *
sizeof(struct rib_head *), M_RTABLE, M_WAITOK|M_ZERO);
V_rtzone = uma_zcreate("rtentry", sizeof(struct rtentry),
rtentry_ctor, rtentry_dtor,
rtentry_zinit, rtentry_zfini, UMA_ALIGN_PTR, 0);
for (dom = domains; dom; dom = dom->dom_next) {
if (dom->dom_rtattach == NULL)
continue;
for (table = 0; table < rt_numfibs; table++) {
fam = dom->dom_family;
if (table != 0 && fam != AF_INET6 && fam != AF_INET)
break;
rnh = rt_tables_get_rnh_ptr(table, fam);
if (rnh == NULL)
panic("%s: rnh NULL", __func__);
dom->dom_rtattach((void **)rnh, 0, table);
}
}
}
VNET_SYSINIT(vnet_route_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
vnet_route_init, 0);
#ifdef VIMAGE
static void
vnet_route_uninit(const void *unused __unused)
{
int table;
int fam;
struct domain *dom;
struct rib_head **rnh;
for (dom = domains; dom; dom = dom->dom_next) {
if (dom->dom_rtdetach == NULL)
continue;
for (table = 0; table < rt_numfibs; table++) {
fam = dom->dom_family;
if (table != 0 && fam != AF_INET6 && fam != AF_INET)
break;
rnh = rt_tables_get_rnh_ptr(table, fam);
if (rnh == NULL)
panic("%s: rnh NULL", __func__);
dom->dom_rtdetach((void **)rnh, 0);
}
}
free(V_rt_tables, M_RTABLE);
uma_zdestroy(V_rtzone);
}
VNET_SYSUNINIT(vnet_route_uninit, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST,
vnet_route_uninit, 0);
#endif
struct rib_head *
rt_table_init(int offset, int family, u_int fibnum)
{
struct rib_head *rh;
rh = malloc(sizeof(struct rib_head), M_RTABLE, M_WAITOK | M_ZERO);
/* TODO: These details should be hidded inside radix.c */
/* Init masks tree */
rn_inithead_internal(&rh->head, rh->rnh_nodes, offset);
rn_inithead_internal(&rh->rmhead.head, rh->rmhead.mask_nodes, 0);
rh->head.rnh_masks = &rh->rmhead;
/* Save metadata associated with this routing table. */
rh->rib_family = family;
rh->rib_fibnum = fibnum;
#ifdef VIMAGE
rh->rib_vnet = curvnet;
#endif
tmproutes_init(rh);
/* Init locks */
RIB_LOCK_INIT(rh);
/* Finally, set base callbacks */
rh->rnh_addaddr = rn_addroute;
rh->rnh_deladdr = rn_delete;
rh->rnh_matchaddr = rn_match;
rh->rnh_lookup = rn_lookup;
rh->rnh_walktree = rn_walktree;
rh->rnh_walktree_from = rn_walktree_from;
return (rh);
}
static int
rt_freeentry(struct radix_node *rn, void *arg)
{
struct radix_head * const rnh = arg;
struct radix_node *x;
x = (struct radix_node *)rn_delete(rn + 2, NULL, rnh);
if (x != NULL)
R_Free(x);
return (0);
}
void
rt_table_destroy(struct rib_head *rh)
{
tmproutes_destroy(rh);
rn_walktree(&rh->rmhead.head, rt_freeentry, &rh->rmhead.head);
/* Assume table is already empty */
RIB_LOCK_DESTROY(rh);
free(rh, M_RTABLE);
}
#ifndef _SYS_SYSPROTO_H_
struct setfib_args {
int fibnum;
};
#endif
int
sys_setfib(struct thread *td, struct setfib_args *uap)
{
if (uap->fibnum < 0 || uap->fibnum >= rt_numfibs)
return EINVAL;
td->td_proc->p_fibnum = uap->fibnum;
return (0);
}
/*
* Packet routing routines.
*/
void
rtalloc_ign_fib(struct route *ro, u_long ignore, u_int fibnum)
{
struct rtentry *rt;
if ((rt = ro->ro_rt) != NULL) {
if (rt->rt_ifp != NULL && rt->rt_flags & RTF_UP)
return;
RTFREE(rt);
ro->ro_rt = NULL;
}
ro->ro_rt = rtalloc1_fib(&ro->ro_dst, 1, ignore, fibnum);
if (ro->ro_rt)
RT_UNLOCK(ro->ro_rt);
}
/*
* Look up the route that matches the address given
* Or, at least try.. Create a cloned route if needed.
*
* The returned route, if any, is locked.
*/
struct rtentry *
rtalloc1(struct sockaddr *dst, int report, u_long ignflags)
{
return (rtalloc1_fib(dst, report, ignflags, RT_DEFAULT_FIB));
}
struct rtentry *
rtalloc1_fib(struct sockaddr *dst, int report, u_long ignflags,
u_int fibnum)
{
RIB_RLOCK_TRACKER;
struct rib_head *rh;
struct radix_node *rn;
struct rtentry *newrt;
struct rt_addrinfo info;
int err = 0, msgtype = RTM_MISS;
KASSERT((fibnum < rt_numfibs), ("rtalloc1_fib: bad fibnum"));
rh = rt_tables_get_rnh(fibnum, dst->sa_family);
newrt = NULL;
if (rh == NULL)
goto miss;
/*
* Look up the address in the table for that Address Family
*/
if ((ignflags & RTF_RNH_LOCKED) == 0)
RIB_RLOCK(rh);
#ifdef INVARIANTS
else
RIB_LOCK_ASSERT(rh);
#endif
rn = rh->rnh_matchaddr(dst, &rh->head);
if (rn && ((rn->rn_flags & RNF_ROOT) == 0)) {
newrt = RNTORT(rn);
RT_LOCK(newrt);
RT_ADDREF(newrt);
if ((ignflags & RTF_RNH_LOCKED) == 0)
RIB_RUNLOCK(rh);
return (newrt);
} else if ((ignflags & RTF_RNH_LOCKED) == 0)
RIB_RUNLOCK(rh);
/*
* Either we hit the root or could not find any match,
* which basically means: "cannot get there from here".
*/
miss:
RTSTAT_INC(rts_unreach);
if (report) {
/*
* If required, report the failure to the supervising
* Authorities.
* For a delete, this is not an error. (report == 0)
*/
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = dst;
rt_missmsg_fib(msgtype, &info, 0, err, fibnum);
}
return (newrt);
}
/*
* Remove a reference count from an rtentry.
* If the count gets low enough, take it out of the routing table
*/
void
rtfree(struct rtentry *rt)
{
struct rib_head *rnh;
KASSERT(rt != NULL,("%s: NULL rt", __func__));
rnh = rt_tables_get_rnh(rt->rt_fibnum, rt_key(rt)->sa_family);
KASSERT(rnh != NULL,("%s: NULL rnh", __func__));
RT_LOCK_ASSERT(rt);
/*
* The callers should use RTFREE_LOCKED() or RTFREE(), so
* we should come here exactly with the last reference.
*/
RT_REMREF(rt);
if (rt->rt_refcnt > 0) {
log(LOG_DEBUG, "%s: %p has %d refs\n", __func__, rt, rt->rt_refcnt);
goto done;
}
/*
* On last reference give the "close method" a chance
* to cleanup private state. This also permits (for
* IPv4 and IPv6) a chance to decide if the routing table
* entry should be purged immediately or at a later time.
* When an immediate purge is to happen the close routine
* typically calls rtexpunge which clears the RTF_UP flag
* on the entry so that the code below reclaims the storage.
*/
if (rt->rt_refcnt == 0 && rnh->rnh_close)
rnh->rnh_close((struct radix_node *)rt, &rnh->head);
/*
* If we are no longer "up" (and ref == 0)
* then we can free the resources associated
* with the route.
*/
if ((rt->rt_flags & RTF_UP) == 0) {
if (rt->rt_nodes->rn_flags & (RNF_ACTIVE | RNF_ROOT))
panic("rtfree 2");
/*
* the rtentry must have been removed from the routing table
* so it is represented in rttrash.. remove that now.
*/
V_rttrash--;
#ifdef DIAGNOSTIC
if (rt->rt_refcnt < 0) {
printf("rtfree: %p not freed (neg refs)\n", rt);
goto done;
}
#endif
/*
* release references on items we hold them on..
* e.g other routes and ifaddrs.
*/
if (rt->rt_ifa)
ifa_free(rt->rt_ifa);
/*
* The key is separatly alloc'd so free it (see rt_setgate()).
* This also frees the gateway, as they are always malloc'd
* together.
*/
R_Free(rt_key(rt));
/*
* and the rtentry itself of course
*/
uma_zfree(V_rtzone, rt);
return;
}
done:
RT_UNLOCK(rt);
}
/*
* Adds a temporal redirect entry to the routing table.
* @fibnum: fib number
* @dst: destination to install redirect to
* @gateway: gateway to go via
* @author: sockaddr of originating router, can be NULL
* @ifp: interface to use for the redirected route
* @flags: set of flags to add. Allowed: RTF_GATEWAY
* @lifetime_sec: time in seconds to expire this redirect.
*
* Retuns 0 on success, errno otherwise.
*/
int
rib_add_redirect(u_int fibnum, struct sockaddr *dst, struct sockaddr *gateway,
struct sockaddr *author, struct ifnet *ifp, int flags, int lifetime_sec)
{
struct rtentry *rt;
int error;
struct rt_addrinfo info;
struct rt_metrics rti_rmx;
struct ifaddr *ifa;
NET_EPOCH_ASSERT();
if (rt_tables_get_rnh(fibnum, dst->sa_family) == NULL)
return (EAFNOSUPPORT);
/* Verify the allowed flag mask. */
KASSERT(((flags & ~(RTF_GATEWAY)) == 0),
("invalid redirect flags: %x", flags));
/* Get the best ifa for the given interface and gateway. */
if ((ifa = ifaof_ifpforaddr(gateway, ifp)) == NULL)
return (ENETUNREACH);
ifa_ref(ifa);
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = dst;
info.rti_info[RTAX_GATEWAY] = gateway;
info.rti_ifa = ifa;
info.rti_ifp = ifp;
info.rti_flags = flags | RTF_DYNAMIC;
/* Setup route metrics to define expire time. */
bzero(&rti_rmx, sizeof(rti_rmx));
/* Set expire time as absolute. */
rti_rmx.rmx_expire = lifetime_sec + time_second;
info.rti_mflags |= RTV_EXPIRE;
info.rti_rmx = &rti_rmx;
error = rtrequest1_fib(RTM_ADD, &info, &rt, fibnum);
ifa_free(ifa);
if (error != 0) {
/* TODO: add per-fib redirect stats. */
return (error);
}
RT_LOCK(rt);
flags = rt->rt_flags;
RTFREE_LOCKED(rt);
RTSTAT_INC(rts_dynamic);
/* Send notification of a route addition to userland. */
bzero(&info, sizeof(info));
info.rti_info[RTAX_DST] = dst;
info.rti_info[RTAX_GATEWAY] = gateway;
info.rti_info[RTAX_AUTHOR] = author;
rt_missmsg_fib(RTM_REDIRECT, &info, flags, error, fibnum);
return (0);
}
/*
* Routing table ioctl interface.
*/
int
rtioctl_fib(u_long req, caddr_t data, u_int fibnum)
{
/*
* If more ioctl commands are added here, make sure the proper
* super-user checks are being performed because it is possible for
* prison-root to make it this far if raw sockets have been enabled
* in jails.
*/
#ifdef INET
/* Multicast goop, grrr... */
return mrt_ioctl ? mrt_ioctl(req, data, fibnum) : EOPNOTSUPP;
#else /* INET */
return ENXIO;
#endif /* INET */
}
struct ifaddr *
ifa_ifwithroute(int flags, const struct sockaddr *dst, struct sockaddr *gateway,
u_int fibnum)
{
struct ifaddr *ifa;
int not_found = 0;
NET_EPOCH_ASSERT();
if ((flags & RTF_GATEWAY) == 0) {
/*
* If we are adding a route to an interface,
* and the interface is a pt to pt link
* we should search for the destination
* as our clue to the interface. Otherwise
* we can use the local address.
*/
ifa = NULL;
if (flags & RTF_HOST)
ifa = ifa_ifwithdstaddr(dst, fibnum);
if (ifa == NULL)
ifa = ifa_ifwithaddr(gateway);
} else {
/*
* If we are adding a route to a remote net
* or host, the gateway may still be on the
* other end of a pt to pt link.
*/
ifa = ifa_ifwithdstaddr(gateway, fibnum);
}
if (ifa == NULL)
ifa = ifa_ifwithnet(gateway, 0, fibnum);
if (ifa == NULL) {
struct rtentry *rt;
rt = rtalloc1_fib(gateway, 0, flags, fibnum);
if (rt == NULL)
goto out;
/*
* dismiss a gateway that is reachable only
* through the default router
*/
switch (gateway->sa_family) {
case AF_INET:
if (satosin(rt_key(rt))->sin_addr.s_addr == INADDR_ANY)
not_found = 1;
break;
case AF_INET6:
if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(rt_key(rt))->sin6_addr))
not_found = 1;
break;
default:
break;
}
if (!not_found && rt->rt_ifa != NULL) {
ifa = rt->rt_ifa;
}
RT_REMREF(rt);
RT_UNLOCK(rt);
if (not_found || ifa == NULL)
goto out;
}
if (ifa->ifa_addr->sa_family != dst->sa_family) {
struct ifaddr *oifa = ifa;
ifa = ifaof_ifpforaddr(dst, ifa->ifa_ifp);
if (ifa == NULL)
ifa = oifa;
}
out:
return (ifa);
}
/*
* Do appropriate manipulations of a routing tree given
* all the bits of info needed
*/
int
rtrequest_fib(int req,
struct sockaddr *dst,
struct sockaddr *gateway,
struct sockaddr *netmask,
int flags,
struct rtentry **ret_nrt,
u_int fibnum)
{
struct rt_addrinfo info;
if (dst->sa_len == 0)
return(EINVAL);
bzero((caddr_t)&info, sizeof(info));
info.rti_flags = flags;
info.rti_info[RTAX_DST] = dst;
info.rti_info[RTAX_GATEWAY] = gateway;
info.rti_info[RTAX_NETMASK] = netmask;
return rtrequest1_fib(req, &info, ret_nrt, fibnum);
}
/*
* Copy most of @rt data into @info.
*
* If @flags contains NHR_COPY, copies dst,netmask and gw to the
* pointers specified by @info structure. Assume such pointers
* are zeroed sockaddr-like structures with sa_len field initialized
* to reflect size of the provided buffer. if no NHR_COPY is specified,
* point dst,netmask and gw @info fields to appropriate @rt values.
*
* if @flags contains NHR_REF, do refcouting on rt_ifp and rt_ifa.
*
* Returns 0 on success.
*/
int
rt_exportinfo(struct rtentry *rt, struct rt_addrinfo *info, int flags)
{
struct rt_metrics *rmx;
struct sockaddr *src, *dst;
int sa_len;
if (flags & NHR_COPY) {
/* Copy destination if dst is non-zero */
src = rt_key(rt);
dst = info->rti_info[RTAX_DST];
sa_len = src->sa_len;
if (dst != NULL) {
if (src->sa_len > dst->sa_len)
return (ENOMEM);
memcpy(dst, src, src->sa_len);
info->rti_addrs |= RTA_DST;
}
/* Copy mask if set && dst is non-zero */
src = rt_mask(rt);
dst = info->rti_info[RTAX_NETMASK];
if (src != NULL && dst != NULL) {
/*
* Radix stores different value in sa_len,
* assume rt_mask() to have the same length
* as rt_key()
*/
if (sa_len > dst->sa_len)
return (ENOMEM);
memcpy(dst, src, src->sa_len);
info->rti_addrs |= RTA_NETMASK;
}
/* Copy gateway is set && dst is non-zero */
src = rt->rt_gateway;
dst = info->rti_info[RTAX_GATEWAY];
if ((rt->rt_flags & RTF_GATEWAY) && src != NULL && dst != NULL){
if (src->sa_len > dst->sa_len)
return (ENOMEM);
memcpy(dst, src, src->sa_len);
info->rti_addrs |= RTA_GATEWAY;
}
} else {
info->rti_info[RTAX_DST] = rt_key(rt);
info->rti_addrs |= RTA_DST;
if (rt_mask(rt) != NULL) {
info->rti_info[RTAX_NETMASK] = rt_mask(rt);
info->rti_addrs |= RTA_NETMASK;
}
if (rt->rt_flags & RTF_GATEWAY) {
info->rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info->rti_addrs |= RTA_GATEWAY;
}
}
rmx = info->rti_rmx;
if (rmx != NULL) {
info->rti_mflags |= RTV_MTU;
rmx->rmx_mtu = rt->rt_mtu;
}
info->rti_flags = rt->rt_flags;
info->rti_ifp = rt->rt_ifp;
info->rti_ifa = rt->rt_ifa;
if (flags & NHR_REF) {
if_ref(info->rti_ifp);
ifa_ref(info->rti_ifa);
}
return (0);
}
/*
* Lookups up route entry for @dst in RIB database for fib @fibnum.
* Exports entry data to @info using rt_exportinfo().
*
* If @flags contains NHR_REF, refcouting is performed on rt_ifp and rt_ifa.
* All references can be released later by calling rib_free_info().
*
* Returns 0 on success.
* Returns ENOENT for lookup failure, ENOMEM for export failure.
*/
int
rib_lookup_info(uint32_t fibnum, const struct sockaddr *dst, uint32_t flags,
uint32_t flowid, struct rt_addrinfo *info)
{
RIB_RLOCK_TRACKER;
struct rib_head *rh;
struct radix_node *rn;
struct rtentry *rt;
int error;
KASSERT((fibnum < rt_numfibs), ("rib_lookup_rte: bad fibnum"));
rh = rt_tables_get_rnh(fibnum, dst->sa_family);
if (rh == NULL)
return (ENOENT);
RIB_RLOCK(rh);
rn = rh->rnh_matchaddr(__DECONST(void *, dst), &rh->head);
if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) {
rt = RNTORT(rn);
/* Ensure route & ifp is UP */
if (RT_LINK_IS_UP(rt->rt_ifp)) {
flags = (flags & NHR_REF) | NHR_COPY;
error = rt_exportinfo(rt, info, flags);
RIB_RUNLOCK(rh);
return (error);
}
}
RIB_RUNLOCK(rh);
return (ENOENT);
}
/*
* Releases all references acquired by rib_lookup_info() when
* called with NHR_REF flags.
*/
void
rib_free_info(struct rt_addrinfo *info)
{
ifa_free(info->rti_ifa);
if_rele(info->rti_ifp);
}
/*
* Iterates over all existing fibs in system calling
* @setwa_f function prior to traversing each fib.
* Calls @wa_f function for each element in current fib.
* If af is not AF_UNSPEC, iterates over fibs in particular
* address family.
*/
void
rt_foreach_fib_walk(int af, rt_setwarg_t *setwa_f, rt_walktree_f_t *wa_f,
void *arg)
{
struct rib_head *rnh;
uint32_t fibnum;
int i;
for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
/* Do we want some specific family? */
if (af != AF_UNSPEC) {
rnh = rt_tables_get_rnh(fibnum, af);
if (rnh == NULL)
continue;
if (setwa_f != NULL)
setwa_f(rnh, fibnum, af, arg);
RIB_WLOCK(rnh);
rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg);
RIB_WUNLOCK(rnh);
continue;
}
for (i = 1; i <= AF_MAX; i++) {
rnh = rt_tables_get_rnh(fibnum, i);
if (rnh == NULL)
continue;
if (setwa_f != NULL)
setwa_f(rnh, fibnum, i, arg);
RIB_WLOCK(rnh);
rnh->rnh_walktree(&rnh->head, (walktree_f_t *)wa_f,arg);
RIB_WUNLOCK(rnh);
}
}
}
struct rt_delinfo
{
struct rt_addrinfo info;
struct rib_head *rnh;
struct rtentry *head;
};
/*
* Conditionally unlinks @rn from radix tree based
* on info data passed in @arg.
*/
static int
rt_checkdelroute(struct radix_node *rn, void *arg)
{
struct rt_delinfo *di;
struct rt_addrinfo *info;
struct rtentry *rt;
int error;
di = (struct rt_delinfo *)arg;
rt = (struct rtentry *)rn;
info = &di->info;
error = 0;
info->rti_info[RTAX_DST] = rt_key(rt);
info->rti_info[RTAX_NETMASK] = rt_mask(rt);
info->rti_info[RTAX_GATEWAY] = rt->rt_gateway;
rt = rt_unlinkrte(di->rnh, info, &error);
if (rt == NULL) {
/* Either not allowed or not matched. Skip entry */
return (0);
}
/* Entry was unlinked. Add to the list and return */
rt->rt_chain = di->head;
di->head = rt;
return (0);
}
/*
* Iterates over a routing table specified by @fibnum and @family and
* deletes elements marked by @filter_f.
* @fibnum: rtable id
* @family: AF_ address family
* @filter_f: function returning non-zero value for items to delete
* @arg: data to pass to the @filter_f function
* @report: true if rtsock notification is needed.
*/
void
rib_walk_del(u_int fibnum, int family, rt_filter_f_t *filter_f, void *arg, bool report)
{
struct rib_head *rnh;
struct rt_delinfo di;
struct rtentry *rt;
rnh = rt_tables_get_rnh(fibnum, family);
if (rnh == NULL)
return;
bzero(&di, sizeof(di));
di.info.rti_filter = filter_f;
di.info.rti_filterdata = arg;
di.rnh = rnh;
RIB_WLOCK(rnh);
rnh->rnh_walktree(&rnh->head, rt_checkdelroute, &di);
RIB_WUNLOCK(rnh);
if (di.head == NULL)
return;
/* We might have something to reclaim. */
while (di.head != NULL) {
rt = di.head;
di.head = rt->rt_chain;
rt->rt_chain = NULL;
/* TODO std rt -> rt_addrinfo export */
di.info.rti_info[RTAX_DST] = rt_key(rt);
di.info.rti_info[RTAX_NETMASK] = rt_mask(rt);
rt_notifydelete(rt, &di.info);
if (report)
rt_routemsg(RTM_DELETE, rt, rt->rt_ifp, 0, fibnum);
RTFREE_LOCKED(rt);
}
}
/*
* Iterates over all existing fibs in system and deletes each element
* for which @filter_f function returns non-zero value.
* If @family is not AF_UNSPEC, iterates over fibs in particular
* address family.
*/
void
rt_foreach_fib_walk_del(int family, rt_filter_f_t *filter_f, void *arg)
{
u_int fibnum;
int i, start, end;
for (fibnum = 0; fibnum < rt_numfibs; fibnum++) {
/* Do we want some specific family? */
if (family != AF_UNSPEC) {
start = family;
end = family;
} else {
start = 1;
end = AF_MAX;
}
for (i = start; i <= end; i++) {
if (rt_tables_get_rnh(fibnum, i) == NULL)
continue;
rib_walk_del(fibnum, i, filter_f, arg, 0);
}
}
}
/*
* Delete Routes for a Network Interface
*
* Called for each routing entry via the rnh->rnh_walktree() call above
* to delete all route entries referencing a detaching network interface.
*
* Arguments:
* rt pointer to rtentry
* arg argument passed to rnh->rnh_walktree() - detaching interface
*
* Returns:
* 0 successful
* errno failed - reason indicated
*/
static int
rt_ifdelroute(const struct rtentry *rt, void *arg)
{
struct ifnet *ifp = arg;
if (rt->rt_ifp != ifp)
return (0);
/*
* Protect (sorta) against walktree recursion problems
* with cloned routes
*/
if ((rt->rt_flags & RTF_UP) == 0)
return (0);
return (1);
}
/*
* Delete all remaining routes using this interface
* Unfortuneatly the only way to do this is to slog through
* the entire routing table looking for routes which point
* to this interface...oh well...
*/
void
rt_flushifroutes_af(struct ifnet *ifp, int af)
{
KASSERT((af >= 1 && af <= AF_MAX), ("%s: af %d not >= 1 and <= %d",
__func__, af, AF_MAX));
rt_foreach_fib_walk_del(af, rt_ifdelroute, ifp);
}
void
rt_flushifroutes(struct ifnet *ifp)
{
rt_foreach_fib_walk_del(AF_UNSPEC, rt_ifdelroute, ifp);
}
/*
* Conditionally unlinks rtentry matching data inside @info from @rnh.
* Returns unlinked, locked and referenced @rtentry on success,
* Returns NULL and sets @perror to:
* ESRCH - if prefix was not found,
* EADDRINUSE - if trying to delete PINNED route without appropriate flag.
* ENOENT - if supplied filter function returned 0 (not matched).
*/
static struct rtentry *
rt_unlinkrte(struct rib_head *rnh, struct rt_addrinfo *info, int *perror)
{
struct sockaddr *dst, *netmask;
struct rtentry *rt;
struct radix_node *rn;
dst = info->rti_info[RTAX_DST];
netmask = info->rti_info[RTAX_NETMASK];
rt = (struct rtentry *)rnh->rnh_lookup(dst, netmask, &rnh->head);
if (rt == NULL) {
*perror = ESRCH;
return (NULL);
}
if ((info->rti_flags & RTF_PINNED) == 0) {
/* Check if target route can be deleted */
if (rt->rt_flags & RTF_PINNED) {
*perror = EADDRINUSE;
return (NULL);
}
}
if (info->rti_filter != NULL) {
if (info->rti_filter(rt, info->rti_filterdata) == 0) {
/* Not matched */
*perror = ENOENT;
return (NULL);
}
/*
* Filter function requested rte deletion.
* Ease the caller work by filling in remaining info
* from that particular entry.
*/
info->rti_info[RTAX_GATEWAY] = rt->rt_gateway;
}
/*
* Remove the item from the tree and return it.
* Complain if it is not there and do no more processing.
*/
*perror = ESRCH;
#ifdef RADIX_MPATH
if (rt_mpath_capable(rnh))
rn = rt_mpath_unlink(rnh, info, rt, perror);
else
#endif
rn = rnh->rnh_deladdr(dst, netmask, &rnh->head);
if (rn == NULL)
return (NULL);
if (rn->rn_flags & (RNF_ACTIVE | RNF_ROOT))
panic ("rtrequest delete");
rt = RNTORT(rn);
RT_LOCK(rt);
RT_ADDREF(rt);
rt->rt_flags &= ~RTF_UP;
*perror = 0;
return (rt);
}
static void
rt_notifydelete(struct rtentry *rt, struct rt_addrinfo *info)
{
struct ifaddr *ifa;
/*
* give the protocol a chance to keep things in sync.
*/
ifa = rt->rt_ifa;
if (ifa != NULL && ifa->ifa_rtrequest != NULL)
ifa->ifa_rtrequest(RTM_DELETE, rt, info);
/*
* One more rtentry floating around that is not
* linked to the routing table. rttrash will be decremented
* when RTFREE(rt) is eventually called.
*/
V_rttrash++;
}
/*
* These (questionable) definitions of apparent local variables apply
* to the next two functions. XXXXXX!!!
*/
#define dst info->rti_info[RTAX_DST]
#define gateway info->rti_info[RTAX_GATEWAY]
#define netmask info->rti_info[RTAX_NETMASK]
#define ifaaddr info->rti_info[RTAX_IFA]
#define ifpaddr info->rti_info[RTAX_IFP]
#define flags info->rti_flags
/*
* Look up rt_addrinfo for a specific fib. Note that if rti_ifa is defined,
* it will be referenced so the caller must free it.
*
* Assume basic consistency checks are executed by callers:
* RTAX_DST exists, if RTF_GATEWAY is set, RTAX_GATEWAY exists as well.
*/
int
rt_getifa_fib(struct rt_addrinfo *info, u_int fibnum)
{
struct epoch_tracker et;
int needref, error;
/*
* ifp may be specified by sockaddr_dl
* when protocol address is ambiguous.
*/
error = 0;
needref = (info->rti_ifa == NULL);
NET_EPOCH_ENTER(et);
/* If we have interface specified by the ifindex in the address, use it */
if (info->rti_ifp == NULL && ifpaddr != NULL &&
ifpaddr->sa_family == AF_LINK) {
const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)ifpaddr;
if (sdl->sdl_index != 0)
info->rti_ifp = ifnet_byindex(sdl->sdl_index);
}
/*
* If we have source address specified, try to find it
* TODO: avoid enumerating all ifas on all interfaces.
*/
if (info->rti_ifa == NULL && ifaaddr != NULL)
info->rti_ifa = ifa_ifwithaddr(ifaaddr);
if (info->rti_ifa == NULL) {
struct sockaddr *sa;
/*
* Most common use case for the userland-supplied routes.
*
* Choose sockaddr to select ifa.
* -- if ifp is set --
* Order of preference:
* 1) IFA address
* 2) gateway address
* Note: for interface routes link-level gateway address
* is specified to indicate the interface index without
* specifying RTF_GATEWAY. In this case, ignore gateway
* Note: gateway AF may be different from dst AF. In this case,
* ignore gateway
* 3) final destination.
* 4) if all of these fails, try to get at least link-level ifa.
* -- else --
* try to lookup gateway or dst in the routing table to get ifa
*/
if (info->rti_info[RTAX_IFA] != NULL)
sa = info->rti_info[RTAX_IFA];
else if ((info->rti_flags & RTF_GATEWAY) != 0 &&
gateway->sa_family == dst->sa_family)
sa = gateway;
else
sa = dst;
if (info->rti_ifp != NULL) {
info->rti_ifa = ifaof_ifpforaddr(sa, info->rti_ifp);
/* Case 4 */
if (info->rti_ifa == NULL && gateway != NULL)
info->rti_ifa = ifaof_ifpforaddr(gateway, info->rti_ifp);
} else if (dst != NULL && gateway != NULL)
info->rti_ifa = ifa_ifwithroute(flags, dst, gateway,
fibnum);
else if (sa != NULL)
info->rti_ifa = ifa_ifwithroute(flags, sa, sa,
fibnum);
}
if (needref && info->rti_ifa != NULL) {
if (info->rti_ifp == NULL)
info->rti_ifp = info->rti_ifa->ifa_ifp;
ifa_ref(info->rti_ifa);
} else
error = ENETUNREACH;
NET_EPOCH_EXIT(et);
return (error);
}
static int
if_updatemtu_cb(struct radix_node *rn, void *arg)
{
struct rtentry *rt;
struct if_mtuinfo *ifmtu;
rt = (struct rtentry *)rn;
ifmtu = (struct if_mtuinfo *)arg;
if (rt->rt_ifp != ifmtu->ifp)
return (0);
if (rt->rt_mtu >= ifmtu->mtu) {
/* We have to decrease mtu regardless of flags */
rt->rt_mtu = ifmtu->mtu;
return (0);
}
/*
* New MTU is bigger. Check if are allowed to alter it
*/
if ((rt->rt_flags & (RTF_FIXEDMTU | RTF_GATEWAY | RTF_HOST)) != 0) {
/*
* Skip routes with user-supplied MTU and
* non-interface routes
*/
return (0);
}
/* We are safe to update route MTU */
rt->rt_mtu = ifmtu->mtu;
return (0);
}
void
rt_updatemtu(struct ifnet *ifp)
{
struct if_mtuinfo ifmtu;
struct rib_head *rnh;
int i, j;
ifmtu.ifp = ifp;
/*
* Try to update rt_mtu for all routes using this interface
* Unfortunately the only way to do this is to traverse all
* routing tables in all fibs/domains.
*/
for (i = 1; i <= AF_MAX; i++) {
ifmtu.mtu = if_getmtu_family(ifp, i);
for (j = 0; j < rt_numfibs; j++) {
rnh = rt_tables_get_rnh(j, i);
if (rnh == NULL)
continue;
RIB_WLOCK(rnh);
rnh->rnh_walktree(&rnh->head, if_updatemtu_cb, &ifmtu);
RIB_WUNLOCK(rnh);
}
}
}
#if 0
int p_sockaddr(char *buf, int buflen, struct sockaddr *s);
int rt_print(char *buf, int buflen, struct rtentry *rt);
int
p_sockaddr(char *buf, int buflen, struct sockaddr *s)
{
void *paddr = NULL;
switch (s->sa_family) {
case AF_INET:
paddr = &((struct sockaddr_in *)s)->sin_addr;
break;
case AF_INET6:
paddr = &((struct sockaddr_in6 *)s)->sin6_addr;
break;
}
if (paddr == NULL)
return (0);
if (inet_ntop(s->sa_family, paddr, buf, buflen) == NULL)
return (0);
return (strlen(buf));
}
int
rt_print(char *buf, int buflen, struct rtentry *rt)
{
struct sockaddr *addr, *mask;
int i = 0;
addr = rt_key(rt);
mask = rt_mask(rt);
i = p_sockaddr(buf, buflen, addr);
if (!(rt->rt_flags & RTF_HOST)) {
buf[i++] = '/';
i += p_sockaddr(buf + i, buflen - i, mask);
}
if (rt->rt_flags & RTF_GATEWAY) {
buf[i++] = '>';
i += p_sockaddr(buf + i, buflen - i, rt->rt_gateway);
}
return (i);
}
#endif
#ifdef RADIX_MPATH
/*
* Deletes key for single-path routes, unlinks rtentry with
* gateway specified in @info from multi-path routes.
*
* Returnes unlinked entry. In case of failure, returns NULL
* and sets @perror to ESRCH.
*/
static struct radix_node *
rt_mpath_unlink(struct rib_head *rnh, struct rt_addrinfo *info,
struct rtentry *rto, int *perror)
{
/*
* if we got multipath routes, we require users to specify
* a matching RTAX_GATEWAY.
*/
struct rtentry *rt; // *rto = NULL;
struct radix_node *rn;
struct sockaddr *gw;
gw = info->rti_info[RTAX_GATEWAY];
rt = rt_mpath_matchgate(rto, gw);
if (rt == NULL) {
*perror = ESRCH;
return (NULL);
}
/*
* this is the first entry in the chain
*/
if (rto == rt) {
rn = rn_mpath_next((struct radix_node *)rt);
/*
* there is another entry, now it's active
*/
if (rn) {
rto = RNTORT(rn);
RT_LOCK(rto);
rto->rt_flags |= RTF_UP;
RT_UNLOCK(rto);
} else if (rt->rt_flags & RTF_GATEWAY) {
/*
* For gateway routes, we need to
* make sure that we we are deleting
* the correct gateway.
* rt_mpath_matchgate() does not
* check the case when there is only
* one route in the chain.
*/
if (gw &&
(rt->rt_gateway->sa_len != gw->sa_len ||
memcmp(rt->rt_gateway, gw, gw->sa_len))) {
*perror = ESRCH;
return (NULL);
}
}
/*
* use the normal delete code to remove
* the first entry
*/
rn = rnh->rnh_deladdr(dst, netmask, &rnh->head);
*perror = 0;
return (rn);
}
/*
* if the entry is 2nd and on up
*/
if (rt_mpath_deldup(rto, rt) == 0)
panic ("rtrequest1: rt_mpath_deldup");
*perror = 0;
rn = (struct radix_node *)rt;
return (rn);
}
#endif
int
rtrequest1_fib(int req, struct rt_addrinfo *info, struct rtentry **ret_nrt,
u_int fibnum)
{
int error = 0;
struct rtentry *rt, *rt_old;
struct radix_node *rn;
struct rib_head *rnh;
struct ifaddr *ifa;
struct sockaddr *ndst;
struct sockaddr_storage mdst;
KASSERT((fibnum < rt_numfibs), ("rtrequest1_fib: bad fibnum"));
KASSERT((flags & RTF_RNH_LOCKED) == 0, ("rtrequest1_fib: locked"));
switch (dst->sa_family) {
case AF_INET6:
case AF_INET:
/* We support multiple FIBs. */
break;
default:
fibnum = RT_DEFAULT_FIB;
break;
}
/*
* Find the correct routing tree to use for this Address Family
*/
rnh = rt_tables_get_rnh(fibnum, dst->sa_family);
if (rnh == NULL)
return (EAFNOSUPPORT);
/*
* If we are adding a host route then we don't want to put
* a netmask in the tree, nor do we want to clone it.
*/
if (flags & RTF_HOST)
netmask = NULL;
switch (req) {
case RTM_DELETE:
if (netmask) {
if (dst->sa_len > sizeof(mdst))
return (EINVAL);
rt_maskedcopy(dst, (struct sockaddr *)&mdst, netmask);
dst = (struct sockaddr *)&mdst;
}
RIB_WLOCK(rnh);
rt = rt_unlinkrte(rnh, info, &error);
RIB_WUNLOCK(rnh);
if (error != 0)
return (error);
rt_notifydelete(rt, info);
/*
* If the caller wants it, then it can have it,
* but it's up to it to free the rtentry as we won't be
* doing it.
*/
if (ret_nrt) {
*ret_nrt = rt;
RT_UNLOCK(rt);
} else
RTFREE_LOCKED(rt);
break;
case RTM_RESOLVE:
/*
* resolve was only used for route cloning
* here for compat
*/
break;
case RTM_ADD:
if ((flags & RTF_GATEWAY) && !gateway)
return (EINVAL);
if (dst && gateway && (dst->sa_family != gateway->sa_family) &&
(gateway->sa_family != AF_UNSPEC) && (gateway->sa_family != AF_LINK))
return (EINVAL);
if (info->rti_ifa == NULL) {
error = rt_getifa_fib(info, fibnum);
if (error)
return (error);
} else {
ifa_ref(info->rti_ifa);
}
rt = uma_zalloc(V_rtzone, M_NOWAIT);
if (rt == NULL) {
ifa_free(info->rti_ifa);
return (ENOBUFS);
}
rt->rt_flags = RTF_UP | flags;
rt->rt_fibnum = fibnum;
/*
* Add the gateway. Possibly re-malloc-ing the storage for it.
*/
if ((error = rt_setgate(rt, dst, gateway)) != 0) {
ifa_free(info->rti_ifa);
uma_zfree(V_rtzone, rt);
return (error);
}
/*
* point to the (possibly newly malloc'd) dest address.
*/
ndst = (struct sockaddr *)rt_key(rt);
/*
* make sure it contains the value we want (masked if needed).
*/
if (netmask) {
rt_maskedcopy(dst, ndst, netmask);
} else
bcopy(dst, ndst, dst->sa_len);
/*
* We use the ifa reference returned by rt_getifa_fib().
* This moved from below so that rnh->rnh_addaddr() can
* examine the ifa and ifa->ifa_ifp if it so desires.
*/
ifa = info->rti_ifa;
rt->rt_ifa = ifa;
rt->rt_ifp = ifa->ifa_ifp;
rt->rt_weight = 1;
rt_setmetrics(info, rt);
RIB_WLOCK(rnh);
RT_LOCK(rt);
#ifdef RADIX_MPATH
/* do not permit exactly the same dst/mask/gw pair */
if (rt_mpath_capable(rnh) &&
rt_mpath_conflict(rnh, rt, netmask)) {
RIB_WUNLOCK(rnh);
ifa_free(rt->rt_ifa);
R_Free(rt_key(rt));
uma_zfree(V_rtzone, rt);
return (EEXIST);
}
#endif
/* XXX mtu manipulation will be done in rnh_addaddr -- itojun */
rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head, rt->rt_nodes);
if (rn != NULL && rt->rt_expire > 0)
tmproutes_update(rnh, rt);
rt_old = NULL;
if (rn == NULL && (info->rti_flags & RTF_PINNED) != 0) {
/*
* Force removal and re-try addition
* TODO: better multipath&pinned support
*/
struct sockaddr *info_dst = info->rti_info[RTAX_DST];
info->rti_info[RTAX_DST] = ndst;
/* Do not delete existing PINNED(interface) routes */
info->rti_flags &= ~RTF_PINNED;
rt_old = rt_unlinkrte(rnh, info, &error);
info->rti_flags |= RTF_PINNED;
info->rti_info[RTAX_DST] = info_dst;
if (rt_old != NULL)
rn = rnh->rnh_addaddr(ndst, netmask, &rnh->head,
rt->rt_nodes);
}
RIB_WUNLOCK(rnh);
if (rt_old != NULL)
RT_UNLOCK(rt_old);
/*
* If it still failed to go into the tree,
* then un-make it (this should be a function)
*/
if (rn == NULL) {
ifa_free(rt->rt_ifa);
R_Free(rt_key(rt));
uma_zfree(V_rtzone, rt);
return (EEXIST);
}
if (rt_old != NULL) {
rt_notifydelete(rt_old, info);
RTFREE(rt_old);
}
/*
* If this protocol has something to add to this then
* allow it to do that as well.
*/
if (ifa->ifa_rtrequest)
ifa->ifa_rtrequest(req, rt, info);
/*
* actually return a resultant rtentry and
* give the caller a single reference.
*/
if (ret_nrt) {
*ret_nrt = rt;
RT_ADDREF(rt);
}
rnh->rnh_gen++; /* Routing table updated */
RT_UNLOCK(rt);
break;
case RTM_CHANGE:
RIB_WLOCK(rnh);
error = rtrequest1_fib_change(rnh, info, ret_nrt, fibnum);
RIB_WUNLOCK(rnh);
break;
default:
error = EOPNOTSUPP;
}
return (error);
}
#undef dst
#undef gateway
#undef netmask
#undef ifaaddr
#undef ifpaddr
#undef flags
static int
rtrequest1_fib_change(struct rib_head *rnh, struct rt_addrinfo *info,
struct rtentry **ret_nrt, u_int fibnum)
{
struct rtentry *rt = NULL;
int error = 0;
int free_ifa = 0;
int family, mtu;
struct if_mtuinfo ifmtu;
RIB_WLOCK_ASSERT(rnh);
rt = (struct rtentry *)rnh->rnh_lookup(info->rti_info[RTAX_DST],
info->rti_info[RTAX_NETMASK], &rnh->head);
if (rt == NULL)
return (ESRCH);
#ifdef RADIX_MPATH
/*
* If we got multipath routes,
* we require users to specify a matching RTAX_GATEWAY.
*/
if (rt_mpath_capable(rnh)) {
rt = rt_mpath_matchgate(rt, info->rti_info[RTAX_GATEWAY]);
if (rt == NULL)
return (ESRCH);
}
#endif
RT_LOCK(rt);
rt_setmetrics(info, rt);
/*
* New gateway could require new ifaddr, ifp;
* flags may also be different; ifp may be specified
* by ll sockaddr when protocol address is ambiguous
*/
if (((rt->rt_flags & RTF_GATEWAY) &&
info->rti_info[RTAX_GATEWAY] != NULL) ||
info->rti_info[RTAX_IFP] != NULL ||
(info->rti_info[RTAX_IFA] != NULL &&
!sa_equal(info->rti_info[RTAX_IFA], rt->rt_ifa->ifa_addr))) {
/*
* XXX: Temporarily set RTF_RNH_LOCKED flag in the rti_flags
* to avoid rlock in the ifa_ifwithroute().
*/
info->rti_flags |= RTF_RNH_LOCKED;
error = rt_getifa_fib(info, fibnum);
info->rti_flags &= ~RTF_RNH_LOCKED;
if (info->rti_ifa != NULL)
free_ifa = 1;
if (error != 0)
goto bad;
}
/* Check if outgoing interface has changed */
if (info->rti_ifa != NULL && info->rti_ifa != rt->rt_ifa &&
rt->rt_ifa != NULL) {
if (rt->rt_ifa->ifa_rtrequest != NULL)
rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt, info);
ifa_free(rt->rt_ifa);
rt->rt_ifa = NULL;
}
/* Update gateway address */
if (info->rti_info[RTAX_GATEWAY] != NULL) {
error = rt_setgate(rt, rt_key(rt), info->rti_info[RTAX_GATEWAY]);
if (error != 0)
goto bad;
rt->rt_flags &= ~RTF_GATEWAY;
rt->rt_flags |= (RTF_GATEWAY & info->rti_flags);
}
if (info->rti_ifa != NULL && info->rti_ifa != rt->rt_ifa) {
ifa_ref(info->rti_ifa);
rt->rt_ifa = info->rti_ifa;
rt->rt_ifp = info->rti_ifp;
}
/* Allow some flags to be toggled on change. */
rt->rt_flags &= ~RTF_FMASK;
rt->rt_flags |= info->rti_flags & RTF_FMASK;
if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest != NULL)
rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, info);
/* Alter route MTU if necessary */
if (rt->rt_ifp != NULL) {
family = info->rti_info[RTAX_DST]->sa_family;
mtu = if_getmtu_family(rt->rt_ifp, family);
/* Set default MTU */
if (rt->rt_mtu == 0)
rt->rt_mtu = mtu;
if (rt->rt_mtu != mtu) {
/* Check if we really need to update */
ifmtu.ifp = rt->rt_ifp;
ifmtu.mtu = mtu;
if_updatemtu_cb(rt->rt_nodes, &ifmtu);
}
}
/*
* This route change may have modified the route's gateway. In that
* case, any inpcbs that have cached this route need to invalidate their
* llentry cache.
*/
rnh->rnh_gen++;
if (ret_nrt) {
*ret_nrt = rt;
RT_ADDREF(rt);
}
bad:
RT_UNLOCK(rt);
if (free_ifa != 0) {
ifa_free(info->rti_ifa);
info->rti_ifa = NULL;
}
return (error);
}
static void
rt_setmetrics(const struct rt_addrinfo *info, struct rtentry *rt)
{
if (info->rti_mflags & RTV_MTU) {
if (info->rti_rmx->rmx_mtu != 0) {
/*
* MTU was explicitly provided by user.
* Keep it.
*/
rt->rt_flags |= RTF_FIXEDMTU;
} else {
/*
* User explicitly sets MTU to 0.
* Assume rollback to default.
*/
rt->rt_flags &= ~RTF_FIXEDMTU;
}
rt->rt_mtu = info->rti_rmx->rmx_mtu;
}
if (info->rti_mflags & RTV_WEIGHT)
rt->rt_weight = info->rti_rmx->rmx_weight;
/* Kernel -> userland timebase conversion. */
if (info->rti_mflags & RTV_EXPIRE)
rt->rt_expire = info->rti_rmx->rmx_expire ?
info->rti_rmx->rmx_expire - time_second + time_uptime : 0;
}
int
rt_setgate(struct rtentry *rt, struct sockaddr *dst, struct sockaddr *gate)
{
/* XXX dst may be overwritten, can we move this to below */
int dlen = SA_SIZE(dst), glen = SA_SIZE(gate);
/*
* Prepare to store the gateway in rt->rt_gateway.
* Both dst and gateway are stored one after the other in the same
* malloc'd chunk. If we have room, we can reuse the old buffer,
* rt_gateway already points to the right place.
* Otherwise, malloc a new block and update the 'dst' address.
*/
if (rt->rt_gateway == NULL || glen > SA_SIZE(rt->rt_gateway)) {
caddr_t new;
R_Malloc(new, caddr_t, dlen + glen);
if (new == NULL)
return ENOBUFS;
/*
* XXX note, we copy from *dst and not *rt_key(rt) because
* rt_setgate() can be called to initialize a newly
* allocated route entry, in which case rt_key(rt) == NULL
* (and also rt->rt_gateway == NULL).
* Free()/free() handle a NULL argument just fine.
*/
bcopy(dst, new, dlen);
R_Free(rt_key(rt)); /* free old block, if any */
rt_key(rt) = (struct sockaddr *)new;
rt->rt_gateway = (struct sockaddr *)(new + dlen);
}
/*
* Copy the new gateway value into the memory chunk.
*/
bcopy(gate, rt->rt_gateway, glen);
return (0);
}
void
rt_maskedcopy(struct sockaddr *src, struct sockaddr *dst, struct sockaddr *netmask)
{
u_char *cp1 = (u_char *)src;
u_char *cp2 = (u_char *)dst;
u_char *cp3 = (u_char *)netmask;
u_char *cplim = cp2 + *cp3;
u_char *cplim2 = cp2 + *cp1;
*cp2++ = *cp1++; *cp2++ = *cp1++; /* copies sa_len & sa_family */
cp3 += 2;
if (cplim > cplim2)
cplim = cplim2;
while (cp2 < cplim)
*cp2++ = *cp1++ & *cp3++;
if (cp2 < cplim2)
bzero((caddr_t)cp2, (unsigned)(cplim2 - cp2));
}
/*
* Set up a routing table entry, normally
* for an interface.
*/
#define _SOCKADDR_TMPSIZE 128 /* Not too big.. kernel stack size is limited */
static inline int
rtinit1(struct ifaddr *ifa, int cmd, int flags, int fibnum)
{
RIB_RLOCK_TRACKER;
struct sockaddr *dst;
struct sockaddr *netmask;
struct rtentry *rt = NULL;
struct rt_addrinfo info;
int error = 0;
int startfib, endfib;
char tempbuf[_SOCKADDR_TMPSIZE];
int didwork = 0;
int a_failure = 0;
struct sockaddr_dl *sdl = NULL;
struct rib_head *rnh;
if (flags & RTF_HOST) {
dst = ifa->ifa_dstaddr;
netmask = NULL;
} else {
dst = ifa->ifa_addr;
netmask = ifa->ifa_netmask;
}
if (dst->sa_len == 0)
return(EINVAL);
switch (dst->sa_family) {
case AF_INET6:
case AF_INET:
/* We support multiple FIBs. */
break;
default:
fibnum = RT_DEFAULT_FIB;
break;
}
if (fibnum == RT_ALL_FIBS) {
if (V_rt_add_addr_allfibs == 0 && cmd == (int)RTM_ADD)
startfib = endfib = ifa->ifa_ifp->if_fib;
else {
startfib = 0;
endfib = rt_numfibs - 1;
}
} else {
KASSERT((fibnum < rt_numfibs), ("rtinit1: bad fibnum"));
startfib = fibnum;
endfib = fibnum;
}
/*
* If it's a delete, check that if it exists,
* it's on the correct interface or we might scrub
* a route to another ifa which would
* be confusing at best and possibly worse.
*/
if (cmd == RTM_DELETE) {
/*
* It's a delete, so it should already exist..
* If it's a net, mask off the host bits
* (Assuming we have a mask)
* XXX this is kinda inet specific..
*/
if (netmask != NULL) {
rt_maskedcopy(dst, (struct sockaddr *)tempbuf, netmask);
dst = (struct sockaddr *)tempbuf;
}
} else if (cmd == RTM_ADD) {
sdl = (struct sockaddr_dl *)tempbuf;
bzero(sdl, sizeof(struct sockaddr_dl));
sdl->sdl_family = AF_LINK;
sdl->sdl_len = sizeof(struct sockaddr_dl);
sdl->sdl_type = ifa->ifa_ifp->if_type;
sdl->sdl_index = ifa->ifa_ifp->if_index;
}
/*
* Now go through all the requested tables (fibs) and do the
* requested action. Realistically, this will either be fib 0
* for protocols that don't do multiple tables or all the
* tables for those that do.
*/
for ( fibnum = startfib; fibnum <= endfib; fibnum++) {
if (cmd == RTM_DELETE) {
struct radix_node *rn;
/*
* Look up an rtentry that is in the routing tree and
* contains the correct info.
*/
rnh = rt_tables_get_rnh(fibnum, dst->sa_family);
if (rnh == NULL)
/* this table doesn't exist but others might */
continue;
RIB_RLOCK(rnh);
rn = rnh->rnh_lookup(dst, netmask, &rnh->head);
#ifdef RADIX_MPATH
if (rt_mpath_capable(rnh)) {
if (rn == NULL)
error = ESRCH;
else {
rt = RNTORT(rn);
/*
* for interface route the
* rt->rt_gateway is sockaddr_intf
* for cloning ARP entries, so
* rt_mpath_matchgate must use the
* interface address
*/
rt = rt_mpath_matchgate(rt,
ifa->ifa_addr);
if (rt == NULL)
error = ESRCH;
}
}
#endif
error = (rn == NULL ||
(rn->rn_flags & RNF_ROOT) ||
RNTORT(rn)->rt_ifa != ifa);
RIB_RUNLOCK(rnh);
if (error) {
/* this is only an error if bad on ALL tables */
continue;
}
}
/*
* Do the actual request
*/
bzero((caddr_t)&info, sizeof(info));
info.rti_ifa = ifa;
info.rti_flags = flags |
(ifa->ifa_flags & ~IFA_RTSELF) | RTF_PINNED;
info.rti_info[RTAX_DST] = dst;
/*
* doing this for compatibility reasons
*/
if (cmd == RTM_ADD)
info.rti_info[RTAX_GATEWAY] = (struct sockaddr *)sdl;
else
info.rti_info[RTAX_GATEWAY] = ifa->ifa_addr;
info.rti_info[RTAX_NETMASK] = netmask;
error = rtrequest1_fib(cmd, &info, &rt, fibnum);
if (error == 0 && rt != NULL) {
/*
* notify any listening routing agents of the change
*/
RT_LOCK(rt);
#ifdef RADIX_MPATH
/*
* in case address alias finds the first address
* e.g. ifconfig bge0 192.0.2.246/24
* e.g. ifconfig bge0 192.0.2.247/24
* the address set in the route is 192.0.2.246
* so we need to replace it with 192.0.2.247
*/
if (memcmp(rt->rt_ifa->ifa_addr,
ifa->ifa_addr, ifa->ifa_addr->sa_len)) {
ifa_free(rt->rt_ifa);
ifa_ref(ifa);
rt->rt_ifp = ifa->ifa_ifp;
rt->rt_ifa = ifa;
}
#endif
RT_ADDREF(rt);
RT_UNLOCK(rt);
rt_newaddrmsg_fib(cmd, ifa, rt, fibnum);
RT_LOCK(rt);
RT_REMREF(rt);
if (cmd == RTM_DELETE) {
/*
* If we are deleting, and we found an entry,
* then it's been removed from the tree..
* now throw it away.
*/
RTFREE_LOCKED(rt);
} else {
if (cmd == RTM_ADD) {
/*
* We just wanted to add it..
* we don't actually need a reference.
*/
RT_REMREF(rt);
}
RT_UNLOCK(rt);
}
didwork = 1;
}
if (error)
a_failure = error;
}
if (cmd == RTM_DELETE) {
if (didwork) {
error = 0;
} else {
/* we only give an error if it wasn't in any table */
error = ((flags & RTF_HOST) ?
EHOSTUNREACH : ENETUNREACH);
}
} else {
if (a_failure) {
/* return an error if any of them failed */
error = a_failure;
}
}
return (error);
}
/*
* Set up a routing table entry, normally
* for an interface.
*/
int
rtinit(struct ifaddr *ifa, int cmd, int flags)
{
struct sockaddr *dst;
int fib = RT_DEFAULT_FIB;
if (flags & RTF_HOST) {
dst = ifa->ifa_dstaddr;
} else {
dst = ifa->ifa_addr;
}
switch (dst->sa_family) {
case AF_INET6:
case AF_INET:
/* We do support multiple FIBs. */
fib = RT_ALL_FIBS;
break;
}
return (rtinit1(ifa, cmd, flags, fib));
}
/*
* Announce interface address arrival/withdraw
* Returns 0 on success.
*/
int
rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
{
KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
("unexpected cmd %d", cmd));
KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
EVENTHANDLER_DIRECT_INVOKE(rt_addrmsg, ifa, cmd);
return (rtsock_addrmsg(cmd, ifa, fibnum));
}
/*
* Announce kernel-originated route addition/removal to rtsock based on @rt data.
* cmd: RTM_ cmd
* @rt: valid rtentry
* @ifp: target route interface
* @fibnum: fib id or RT_ALL_FIBS
*
* Returns 0 on success.
*/
int
rt_routemsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int rti_addrs,
int fibnum)
{
KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
("unexpected cmd %d", cmd));
KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__));
return (rtsock_routemsg(cmd, rt, ifp, 0, fibnum));
}
/*
* Announce kernel-originated route addition/removal to rtsock based on @rt data.
* cmd: RTM_ cmd
* @info: addrinfo structure with valid data.
* @fibnum: fib id or RT_ALL_FIBS
*
* Returns 0 on success.
*/
int
rt_routemsg_info(int cmd, struct rt_addrinfo *info, int fibnum)
{
KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE || cmd == RTM_CHANGE,
("unexpected cmd %d", cmd));
KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
KASSERT(info->rti_info[RTAX_DST] != NULL, (":%s: RTAX_DST must be supplied", __func__));
return (rtsock_routemsg_info(cmd, info, fibnum));
}
/*
* This is called to generate messages from the routing socket
* indicating a network interface has had addresses associated with it.
*/
void
rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, struct rtentry *rt, int fibnum)
{
KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
("unexpected cmd %u", cmd));
KASSERT(fibnum == RT_ALL_FIBS || (fibnum >= 0 && fibnum < rt_numfibs),
("%s: fib out of range 0 <=%d<%d", __func__, fibnum, rt_numfibs));
if (cmd == RTM_ADD) {
rt_addrmsg(cmd, ifa, fibnum);
if (rt != NULL)
rt_routemsg(cmd, rt, ifa->ifa_ifp, 0, fibnum);
} else {
if (rt != NULL)
rt_routemsg(cmd, rt, ifa->ifa_ifp, 0, fibnum);
rt_addrmsg(cmd, ifa, fibnum);
}
}
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