freebsd-skq/sys/net/rtsock.c
melifaro aaa6b80bb3 Merge 260488, r260508.
r260488:
  Split rt_newaddrmsg_fib() into two different functions.
  Adding/deleting interface addresses involves access to 3 different subsystems,
  int different parts of code. Each call can fail, so reporting successful
  operation by rtsock in the middle of the process error-prone.

  Further split routing notification API and actual rtsock calls via creating
  public-available rt_addrmsg() / rt_routemsg() functions with "private"
  rtsock_* backend.

r260508:
  Simplify inet alias handling code: if we're adding/removing alias which
  has the same prefix as some other alias on the same interface, use
  newly-added rt_addrmsg() instead of hand-rolled in_addralias_rtmsg().

  This eliminates the following rtsock messages:

  Pinned RTM_ADD for prefix (for alias addition).
  Pinned RTM_DELETE for prefix (for alias withdrawal).

  Example (got 10.0.0.1/24 on vlan4, playing with 10.0.0.2/24):

  before commit, addition:

    got message of size 116 on Fri Jan 10 14:13:15 2014
    RTM_NEWADDR: address being added to iface: len 116, metric 0, flags:
    sockaddrs: <NETMASK,IFP,IFA,BRD>
     255.255.255.0 vlan4:8.0.27.c5.29.d4 10.0.0.2 10.0.0.255

    got message of size 192 on Fri Jan 10 14:13:15 2014
    RTM_ADD: Add Route: len 192, pid: 0, seq 0, errno 0, flags:<UP,PINNED>
    locks:  inits:
    sockaddrs: <DST,GATEWAY,NETMASK>
     10.0.0.0 10.0.0.2 (255) ffff ffff ff

  after commit, addition:

    got message of size 116 on Fri Jan 10 13:56:26 2014
    RTM_NEWADDR: address being added to iface: len 116, metric 0, flags:
    sockaddrs: <NETMASK,IFP,IFA,BRD>
     255.255.255.0 vlan4:8.0.27.c5.29.d4 14.0.0.2 14.0.0.255

  before commit, wihdrawal:

    got message of size 192 on Fri Jan 10 13:58:59 2014
    RTM_DELETE: Delete Route: len 192, pid: 0, seq 0, errno 0, flags:<UP,PINNED>
    locks:  inits:
    sockaddrs: <DST,GATEWAY,NETMASK>
     10.0.0.0 10.0.0.2 (255) ffff ffff ff

    got message of size 116 on Fri Jan 10 13:58:59 2014
    RTM_DELADDR: address being removed from iface: len 116, metric 0, flags:
    sockaddrs: <NETMASK,IFP,IFA,BRD>
     255.255.255.0 vlan4:8.0.27.c5.29.d4 10.0.0.2 10.0.0.255

  adter commit, withdrawal:

    got message of size 116 on Fri Jan 10 14:14:11 2014
    RTM_DELADDR: address being removed from iface: len 116, metric 0, flags:
    sockaddrs: <NETMASK,IFP,IFA,BRD>
     255.255.255.0 vlan4:8.0.27.c5.29.d4 10.0.0.2 10.0.0.255

  Sending both RTM_ADD/RTM_DELETE messages to rtsock is completely wrong
  (and requires some hacks to keep prefix in route table on RTM_DELETE).

  I've tested this change with quagga (no change) and bird (*).

  bird alias handling is already broken in *BSD sysdep code, so nothing
  changes here, too.

  I'm going to MFC this change if there will be no complains about behavior
  change.

  While here, fix some style(9) bugs introduced by r260488
  (pointed by glebius and bde).
2014-05-08 21:03:31 +00:00

2003 lines
50 KiB
C

/*-
* 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.
* 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.
*
* @(#)rtsock.c 8.7 (Berkeley) 10/12/95
* $FreeBSD$
*/
#include "opt_compat.h"
#include "opt_mpath.h"
#include "opt_inet.h"
#include "opt_inet6.h"
#include <sys/param.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/domain.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/rwlock.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#define _IN_NET_RTSOCK_C
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_llatbl.h>
#include <net/if_types.h>
#include <net/netisr.h>
#include <net/raw_cb.h>
#include <net/route.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/if_ether.h>
#include <netinet/ip_carp.h>
#ifdef INET6
#include <netinet6/ip6_var.h>
#include <netinet6/scope6_var.h>
#endif
#ifdef COMPAT_FREEBSD32
#include <sys/mount.h>
#include <compat/freebsd32/freebsd32.h>
struct if_data32 {
uint8_t ifi_type;
uint8_t ifi_physical;
uint8_t ifi_addrlen;
uint8_t ifi_hdrlen;
uint8_t ifi_link_state;
uint8_t ifi_vhid;
uint8_t ifi_baudrate_pf;
uint8_t ifi_datalen;
uint32_t ifi_mtu;
uint32_t ifi_metric;
uint32_t ifi_baudrate;
uint32_t ifi_ipackets;
uint32_t ifi_ierrors;
uint32_t ifi_opackets;
uint32_t ifi_oerrors;
uint32_t ifi_collisions;
uint32_t ifi_ibytes;
uint32_t ifi_obytes;
uint32_t ifi_imcasts;
uint32_t ifi_omcasts;
uint32_t ifi_iqdrops;
uint32_t ifi_noproto;
uint32_t ifi_hwassist;
int32_t ifi_epoch;
struct timeval32 ifi_lastchange;
uint32_t ifi_oqdrops;
};
struct if_msghdr32 {
uint16_t ifm_msglen;
uint8_t ifm_version;
uint8_t ifm_type;
int32_t ifm_addrs;
int32_t ifm_flags;
uint16_t ifm_index;
struct if_data32 ifm_data;
};
struct if_msghdrl32 {
uint16_t ifm_msglen;
uint8_t ifm_version;
uint8_t ifm_type;
int32_t ifm_addrs;
int32_t ifm_flags;
uint16_t ifm_index;
uint16_t _ifm_spare1;
uint16_t ifm_len;
uint16_t ifm_data_off;
struct if_data32 ifm_data;
};
struct ifa_msghdrl32 {
uint16_t ifam_msglen;
uint8_t ifam_version;
uint8_t ifam_type;
int32_t ifam_addrs;
int32_t ifam_flags;
uint16_t ifam_index;
uint16_t _ifam_spare1;
uint16_t ifam_len;
uint16_t ifam_data_off;
int32_t ifam_metric;
struct if_data32 ifam_data;
};
#endif /* COMPAT_FREEBSD32 */
MALLOC_DEFINE(M_RTABLE, "routetbl", "routing tables");
/* NB: these are not modified */
static struct sockaddr route_src = { 2, PF_ROUTE, };
static struct sockaddr sa_zero = { sizeof(sa_zero), AF_INET, };
/* These are external hooks for CARP. */
int (*carp_get_vhid_p)(struct ifaddr *);
/*
* Used by rtsock/raw_input callback code to decide whether to filter the update
* notification to a socket bound to a particular FIB.
*/
#define RTS_FILTER_FIB M_PROTO8
static struct {
int ip_count; /* attached w/ AF_INET */
int ip6_count; /* attached w/ AF_INET6 */
int ipx_count; /* attached w/ AF_IPX */
int any_count; /* total attached */
} route_cb;
struct mtx rtsock_mtx;
MTX_SYSINIT(rtsock, &rtsock_mtx, "rtsock route_cb lock", MTX_DEF);
#define RTSOCK_LOCK() mtx_lock(&rtsock_mtx)
#define RTSOCK_UNLOCK() mtx_unlock(&rtsock_mtx)
#define RTSOCK_LOCK_ASSERT() mtx_assert(&rtsock_mtx, MA_OWNED)
static SYSCTL_NODE(_net, OID_AUTO, route, CTLFLAG_RD, 0, "");
struct walkarg {
int w_tmemsize;
int w_op, w_arg;
caddr_t w_tmem;
struct sysctl_req *w_req;
};
static void rts_input(struct mbuf *m);
static struct mbuf *rt_msg1(int type, struct rt_addrinfo *rtinfo);
static int rt_msg2(int type, struct rt_addrinfo *rtinfo,
caddr_t cp, struct walkarg *w);
static int rt_xaddrs(caddr_t cp, caddr_t cplim,
struct rt_addrinfo *rtinfo);
static int sysctl_dumpentry(struct radix_node *rn, void *vw);
static int sysctl_iflist(int af, struct walkarg *w);
static int sysctl_ifmalist(int af, struct walkarg *w);
static int route_output(struct mbuf *m, struct socket *so);
static void rt_setmetrics(const struct rt_msghdr *rtm, struct rtentry *rt);
static void rt_getmetrics(const struct rtentry *rt, struct rt_metrics *out);
static void rt_dispatch(struct mbuf *, sa_family_t);
static struct netisr_handler rtsock_nh = {
.nh_name = "rtsock",
.nh_handler = rts_input,
.nh_proto = NETISR_ROUTE,
.nh_policy = NETISR_POLICY_SOURCE,
};
static int
sysctl_route_netisr_maxqlen(SYSCTL_HANDLER_ARGS)
{
int error, qlimit;
netisr_getqlimit(&rtsock_nh, &qlimit);
error = sysctl_handle_int(oidp, &qlimit, 0, req);
if (error || !req->newptr)
return (error);
if (qlimit < 1)
return (EINVAL);
return (netisr_setqlimit(&rtsock_nh, qlimit));
}
SYSCTL_PROC(_net_route, OID_AUTO, netisr_maxqlen, CTLTYPE_INT|CTLFLAG_RW,
0, 0, sysctl_route_netisr_maxqlen, "I",
"maximum routing socket dispatch queue length");
static void
rts_init(void)
{
int tmp;
if (TUNABLE_INT_FETCH("net.route.netisr_maxqlen", &tmp))
rtsock_nh.nh_qlimit = tmp;
netisr_register(&rtsock_nh);
}
SYSINIT(rtsock, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rts_init, 0);
static int
raw_input_rts_cb(struct mbuf *m, struct sockproto *proto, struct sockaddr *src,
struct rawcb *rp)
{
int fibnum;
KASSERT(m != NULL, ("%s: m is NULL", __func__));
KASSERT(proto != NULL, ("%s: proto is NULL", __func__));
KASSERT(rp != NULL, ("%s: rp is NULL", __func__));
/* No filtering requested. */
if ((m->m_flags & RTS_FILTER_FIB) == 0)
return (0);
/* Check if it is a rts and the fib matches the one of the socket. */
fibnum = M_GETFIB(m);
if (proto->sp_family != PF_ROUTE ||
rp->rcb_socket == NULL ||
rp->rcb_socket->so_fibnum == fibnum)
return (0);
/* Filtering requested and no match, the socket shall be skipped. */
return (1);
}
static void
rts_input(struct mbuf *m)
{
struct sockproto route_proto;
unsigned short *family;
struct m_tag *tag;
route_proto.sp_family = PF_ROUTE;
tag = m_tag_find(m, PACKET_TAG_RTSOCKFAM, NULL);
if (tag != NULL) {
family = (unsigned short *)(tag + 1);
route_proto.sp_protocol = *family;
m_tag_delete(m, tag);
} else
route_proto.sp_protocol = 0;
raw_input_ext(m, &route_proto, &route_src, raw_input_rts_cb);
}
/*
* It really doesn't make any sense at all for this code to share much
* with raw_usrreq.c, since its functionality is so restricted. XXX
*/
static void
rts_abort(struct socket *so)
{
raw_usrreqs.pru_abort(so);
}
static void
rts_close(struct socket *so)
{
raw_usrreqs.pru_close(so);
}
/* pru_accept is EOPNOTSUPP */
static int
rts_attach(struct socket *so, int proto, struct thread *td)
{
struct rawcb *rp;
int error;
KASSERT(so->so_pcb == NULL, ("rts_attach: so_pcb != NULL"));
/* XXX */
rp = malloc(sizeof *rp, M_PCB, M_WAITOK | M_ZERO);
if (rp == NULL)
return ENOBUFS;
so->so_pcb = (caddr_t)rp;
so->so_fibnum = td->td_proc->p_fibnum;
error = raw_attach(so, proto);
rp = sotorawcb(so);
if (error) {
so->so_pcb = NULL;
free(rp, M_PCB);
return error;
}
RTSOCK_LOCK();
switch(rp->rcb_proto.sp_protocol) {
case AF_INET:
route_cb.ip_count++;
break;
case AF_INET6:
route_cb.ip6_count++;
break;
case AF_IPX:
route_cb.ipx_count++;
break;
}
route_cb.any_count++;
RTSOCK_UNLOCK();
soisconnected(so);
so->so_options |= SO_USELOOPBACK;
return 0;
}
static int
rts_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
{
return (raw_usrreqs.pru_bind(so, nam, td)); /* xxx just EINVAL */
}
static int
rts_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
{
return (raw_usrreqs.pru_connect(so, nam, td)); /* XXX just EINVAL */
}
/* pru_connect2 is EOPNOTSUPP */
/* pru_control is EOPNOTSUPP */
static void
rts_detach(struct socket *so)
{
struct rawcb *rp = sotorawcb(so);
KASSERT(rp != NULL, ("rts_detach: rp == NULL"));
RTSOCK_LOCK();
switch(rp->rcb_proto.sp_protocol) {
case AF_INET:
route_cb.ip_count--;
break;
case AF_INET6:
route_cb.ip6_count--;
break;
case AF_IPX:
route_cb.ipx_count--;
break;
}
route_cb.any_count--;
RTSOCK_UNLOCK();
raw_usrreqs.pru_detach(so);
}
static int
rts_disconnect(struct socket *so)
{
return (raw_usrreqs.pru_disconnect(so));
}
/* pru_listen is EOPNOTSUPP */
static int
rts_peeraddr(struct socket *so, struct sockaddr **nam)
{
return (raw_usrreqs.pru_peeraddr(so, nam));
}
/* pru_rcvd is EOPNOTSUPP */
/* pru_rcvoob is EOPNOTSUPP */
static int
rts_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
struct mbuf *control, struct thread *td)
{
return (raw_usrreqs.pru_send(so, flags, m, nam, control, td));
}
/* pru_sense is null */
static int
rts_shutdown(struct socket *so)
{
return (raw_usrreqs.pru_shutdown(so));
}
static int
rts_sockaddr(struct socket *so, struct sockaddr **nam)
{
return (raw_usrreqs.pru_sockaddr(so, nam));
}
static struct pr_usrreqs route_usrreqs = {
.pru_abort = rts_abort,
.pru_attach = rts_attach,
.pru_bind = rts_bind,
.pru_connect = rts_connect,
.pru_detach = rts_detach,
.pru_disconnect = rts_disconnect,
.pru_peeraddr = rts_peeraddr,
.pru_send = rts_send,
.pru_shutdown = rts_shutdown,
.pru_sockaddr = rts_sockaddr,
.pru_close = rts_close,
};
#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 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);
}
/*ARGSUSED*/
static int
route_output(struct mbuf *m, struct socket *so)
{
#define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
struct rt_msghdr *rtm = NULL;
struct rtentry *rt = NULL;
struct radix_node_head *rnh;
struct rt_addrinfo info;
#ifdef INET6
struct sockaddr_storage ss;
struct sockaddr_in6 *sin6;
int i, rti_need_deembed = 0;
#endif
int len, error = 0;
struct ifnet *ifp = NULL;
union sockaddr_union saun;
sa_family_t saf = AF_UNSPEC;
#define senderr(e) { error = e; goto flush;}
if (m == NULL || ((m->m_len < sizeof(long)) &&
(m = m_pullup(m, sizeof(long))) == NULL))
return (ENOBUFS);
if ((m->m_flags & M_PKTHDR) == 0)
panic("route_output");
len = m->m_pkthdr.len;
if (len < sizeof(*rtm) ||
len != mtod(m, struct rt_msghdr *)->rtm_msglen) {
info.rti_info[RTAX_DST] = NULL;
senderr(EINVAL);
}
R_Malloc(rtm, struct rt_msghdr *, len);
if (rtm == NULL) {
info.rti_info[RTAX_DST] = NULL;
senderr(ENOBUFS);
}
m_copydata(m, 0, len, (caddr_t)rtm);
if (rtm->rtm_version != RTM_VERSION) {
info.rti_info[RTAX_DST] = NULL;
senderr(EPROTONOSUPPORT);
}
rtm->rtm_pid = curproc->p_pid;
bzero(&info, sizeof(info));
info.rti_addrs = rtm->rtm_addrs;
/*
* 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)) {
info.rti_info[RTAX_DST] = NULL;
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;
/*
* Verify that the caller has the appropriate privilege; RTM_GET
* is the only operation the non-superuser is allowed.
*/
if (rtm->rtm_type != RTM_GET) {
error = priv_check(curthread, PRIV_NET_ROUTE);
if (error)
senderr(error);
}
/*
* 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 route gw_ro;
bzero(&gw_ro, sizeof(gw_ro));
gw_ro.ro_dst = *info.rti_info[RTAX_GATEWAY];
rtalloc_ign_fib(&gw_ro, 0, so->so_fibnum);
/*
* 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 (gw_ro.ro_rt != NULL &&
gw_ro.ro_rt->rt_gateway->sa_family == AF_LINK &&
gw_ro.ro_rt->rt_ifp->if_flags & IFF_LOOPBACK) {
info.rti_flags &= ~RTF_GATEWAY;
info.rti_flags |= RTF_GWFLAG_COMPAT;
}
if (gw_ro.ro_rt != NULL)
RTFREE(gw_ro.ro_rt);
}
switch (rtm->rtm_type) {
struct rtentry *saved_nrt;
case RTM_ADD:
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_ADD, &info, &saved_nrt,
so->so_fibnum);
if (error == 0 && saved_nrt) {
#ifdef INET6
rti_need_deembed = (V_deembed_scopeid) ? 1 : 0;
#endif
RT_LOCK(saved_nrt);
rt_setmetrics(rtm, 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,
so->so_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:
case RTM_CHANGE:
case RTM_LOCK:
rnh = rt_tables_get_rnh(so->so_fibnum,
info.rti_info[RTAX_DST]->sa_family);
if (rnh == NULL)
senderr(EAFNOSUPPORT);
RADIX_NODE_HEAD_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);
} else
rt = (struct rtentry *) rnh->rnh_lookup(
info.rti_info[RTAX_DST],
info.rti_info[RTAX_NETMASK], rnh);
if (rt == NULL) {
RADIX_NODE_HEAD_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 (rn_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) {
RADIX_NODE_HEAD_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);
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);
if (rt == NULL) {
RADIX_NODE_HEAD_RUNLOCK(rnh);
senderr(ESRCH);
}
}
RT_LOCK(rt);
RT_ADDREF(rt);
RADIX_NODE_HEAD_RUNLOCK(rnh);
switch(rtm->rtm_type) {
case RTM_GET:
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] = rt_mask(rt);
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;
}
len = rt_msg2(rtm->rtm_type, &info, NULL, NULL);
if (len > rtm->rtm_msglen) {
struct rt_msghdr *new_rtm;
R_Malloc(new_rtm, struct rt_msghdr *, len);
if (new_rtm == NULL) {
RT_UNLOCK(rt);
senderr(ENOBUFS);
}
bcopy(rtm, new_rtm, rtm->rtm_msglen);
Free(rtm); rtm = new_rtm;
}
(void)rt_msg2(rtm->rtm_type, &info, (caddr_t)rtm, NULL);
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;
break;
case RTM_CHANGE:
/*
* 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))) {
RT_UNLOCK(rt);
RADIX_NODE_HEAD_LOCK(rnh);
error = rt_getifa_fib(&info, rt->rt_fibnum);
/*
* XXXRW: Really we should release this
* reference later, but this maintains
* historical behavior.
*/
if (info.rti_ifa != NULL)
ifa_free(info.rti_ifa);
RADIX_NODE_HEAD_UNLOCK(rnh);
if (error != 0)
senderr(error);
RT_LOCK(rt);
}
if (info.rti_ifa != NULL &&
info.rti_ifa != rt->rt_ifa &&
rt->rt_ifa != NULL &&
rt->rt_ifa->ifa_rtrequest != NULL) {
rt->rt_ifa->ifa_rtrequest(RTM_DELETE, rt,
&info);
ifa_free(rt->rt_ifa);
}
if (info.rti_info[RTAX_GATEWAY] != NULL) {
RT_UNLOCK(rt);
RADIX_NODE_HEAD_LOCK(rnh);
RT_LOCK(rt);
error = rt_setgate(rt, rt_key(rt),
info.rti_info[RTAX_GATEWAY]);
RADIX_NODE_HEAD_UNLOCK(rnh);
if (error != 0) {
RT_UNLOCK(rt);
senderr(error);
}
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 = (rt->rt_flags & ~RTF_FMASK) |
(rtm->rtm_flags & RTF_FMASK);
rt_setmetrics(rtm, rt);
rtm->rtm_index = rt->rt_ifp->if_index;
if (rt->rt_ifa && rt->rt_ifa->ifa_rtrequest)
rt->rt_ifa->ifa_rtrequest(RTM_ADD, rt, &info);
/* FALLTHROUGH */
case RTM_LOCK:
/* We don't support locks anymore */
break;
}
RT_UNLOCK(rt);
break;
default:
senderr(EOPNOTSUPP);
}
flush:
if (rtm) {
if (error)
rtm->rtm_errno = error;
else
rtm->rtm_flags |= RTF_DONE;
}
if (rt) /* XXX can this be true? */
RTFREE(rt);
{
struct rawcb *rp = NULL;
/*
* Check to see if we don't want our own messages.
*/
if ((so->so_options & SO_USELOOPBACK) == 0) {
if (route_cb.any_count <= 1) {
if (rtm)
Free(rtm);
m_freem(m);
return (error);
}
/* There is another listener, so construct message */
rp = sotorawcb(so);
}
if (rtm) {
#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
m_copyback(m, 0, rtm->rtm_msglen, (caddr_t)rtm);
if (m->m_pkthdr.len < rtm->rtm_msglen) {
m_freem(m);
m = NULL;
} else if (m->m_pkthdr.len > rtm->rtm_msglen)
m_adj(m, rtm->rtm_msglen - m->m_pkthdr.len);
}
if (m) {
M_SETFIB(m, so->so_fibnum);
m->m_flags |= RTS_FILTER_FIB;
if (rp) {
/*
* XXX insure we don't get a copy by
* invalidating our protocol
*/
unsigned short family = rp->rcb_proto.sp_family;
rp->rcb_proto.sp_family = 0;
rt_dispatch(m, saf);
rp->rcb_proto.sp_family = family;
} else
rt_dispatch(m, saf);
}
/* info.rti_info[RTAX_DST] (used above) can point inside of rtm */
if (rtm)
Free(rtm);
}
return (error);
#undef sa_equal
}
static void
rt_setmetrics(const struct rt_msghdr *rtm, struct rtentry *rt)
{
if (rtm->rtm_inits & RTV_MTU)
rt->rt_mtu = rtm->rtm_rmx.rmx_mtu;
if (rtm->rtm_inits & RTV_WEIGHT)
rt->rt_weight = rtm->rtm_rmx.rmx_weight;
/* Kernel -> userland timebase conversion. */
if (rtm->rtm_inits & RTV_EXPIRE)
rt->rt_expire = rtm->rtm_rmx.rmx_expire ?
rtm->rtm_rmx.rmx_expire - time_second + time_uptime : 0;
}
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;
}
/*
* 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);
}
/*
* Used by the routing socket.
*/
static struct mbuf *
rt_msg1(int type, struct rt_addrinfo *rtinfo)
{
struct rt_msghdr *rtm;
struct mbuf *m;
int i;
struct sockaddr *sa;
#ifdef INET6
struct sockaddr_storage ss;
struct sockaddr_in6 *sin6;
#endif
int len, dlen;
switch (type) {
case RTM_DELADDR:
case RTM_NEWADDR:
len = sizeof(struct ifa_msghdr);
break;
case RTM_DELMADDR:
case RTM_NEWMADDR:
len = sizeof(struct ifma_msghdr);
break;
case RTM_IFINFO:
len = sizeof(struct if_msghdr);
break;
case RTM_IFANNOUNCE:
case RTM_IEEE80211:
len = sizeof(struct if_announcemsghdr);
break;
default:
len = sizeof(struct rt_msghdr);
}
/* XXXGL: can we use MJUMPAGESIZE cluster here? */
KASSERT(len <= MCLBYTES, ("%s: message too big", __func__));
if (len > MHLEN)
m = m_getcl(M_NOWAIT, MT_DATA, M_PKTHDR);
else
m = m_gethdr(M_NOWAIT, MT_DATA);
if (m == NULL)
return (m);
m->m_pkthdr.len = m->m_len = len;
rtm = mtod(m, struct rt_msghdr *);
bzero((caddr_t)rtm, len);
for (i = 0; i < RTAX_MAX; i++) {
if ((sa = rtinfo->rti_info[i]) == NULL)
continue;
rtinfo->rti_addrs |= (1 << i);
dlen = SA_SIZE(sa);
#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
m_copyback(m, len, dlen, (caddr_t)sa);
len += dlen;
}
if (m->m_pkthdr.len != len) {
m_freem(m);
return (NULL);
}
rtm->rtm_msglen = len;
rtm->rtm_version = RTM_VERSION;
rtm->rtm_type = type;
return (m);
}
/*
* Used by the sysctl code and routing socket.
*/
static int
rt_msg2(int type, struct rt_addrinfo *rtinfo, caddr_t cp, struct walkarg *w)
{
int i;
int len, dlen, second_time = 0;
caddr_t cp0;
#ifdef INET6
struct sockaddr_storage ss;
struct sockaddr_in6 *sin6;
#endif
rtinfo->rti_addrs = 0;
again:
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);
}
cp0 = cp;
if (cp0)
cp += len;
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) {
#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;
}
len += dlen;
}
len = ALIGN(len);
if (cp == NULL && w != NULL && !second_time) {
struct walkarg *rw = w;
if (rw->w_req) {
if (rw->w_tmemsize < len) {
if (rw->w_tmem)
free(rw->w_tmem, M_RTABLE);
rw->w_tmem = (caddr_t)
malloc(len, M_RTABLE, M_NOWAIT);
if (rw->w_tmem)
rw->w_tmemsize = len;
}
if (rw->w_tmem) {
cp = rw->w_tmem;
second_time = 1;
goto again;
}
}
}
if (cp) {
struct rt_msghdr *rtm = (struct rt_msghdr *)cp0;
rtm->rtm_version = RTM_VERSION;
rtm->rtm_type = type;
rtm->rtm_msglen = len;
}
return (len);
}
/*
* This routine is called to generate a message from the routing
* socket indicating that a redirect has occured, a routing lookup
* has failed, or that a protocol has detected timeouts to a particular
* destination.
*/
void
rt_missmsg_fib(int type, struct rt_addrinfo *rtinfo, int flags, int error,
int fibnum)
{
struct rt_msghdr *rtm;
struct mbuf *m;
struct sockaddr *sa = rtinfo->rti_info[RTAX_DST];
if (route_cb.any_count == 0)
return;
m = rt_msg1(type, rtinfo);
if (m == NULL)
return;
if (fibnum != RT_ALL_FIBS) {
KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: fibnum out "
"of range 0 <= %d < %d", __func__, fibnum, rt_numfibs));
M_SETFIB(m, fibnum);
m->m_flags |= RTS_FILTER_FIB;
}
rtm = mtod(m, struct rt_msghdr *);
rtm->rtm_flags = RTF_DONE | flags;
rtm->rtm_errno = error;
rtm->rtm_addrs = rtinfo->rti_addrs;
rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
}
void
rt_missmsg(int type, struct rt_addrinfo *rtinfo, int flags, int error)
{
rt_missmsg_fib(type, rtinfo, flags, error, RT_ALL_FIBS);
}
/*
* This routine is called to generate a message from the routing
* socket indicating that the status of a network interface has changed.
*/
void
rt_ifmsg(struct ifnet *ifp)
{
struct if_msghdr *ifm;
struct mbuf *m;
struct rt_addrinfo info;
if (route_cb.any_count == 0)
return;
bzero((caddr_t)&info, sizeof(info));
m = rt_msg1(RTM_IFINFO, &info);
if (m == NULL)
return;
ifm = mtod(m, struct if_msghdr *);
ifm->ifm_index = ifp->if_index;
ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
ifm->ifm_data = ifp->if_data;
ifm->ifm_addrs = 0;
rt_dispatch(m, AF_UNSPEC);
}
/*
* Announce interface address arrival/withdraw.
* Please do not call directly, use rt_addrmsg().
* Assume input data to be valid.
* Returns 0 on success.
*/
int
rtsock_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
{
struct rt_addrinfo info;
struct sockaddr *sa;
int ncmd;
struct mbuf *m;
struct ifa_msghdr *ifam;
struct ifnet *ifp = ifa->ifa_ifp;
if (route_cb.any_count == 0)
return (0);
ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
if ((m = rt_msg1(ncmd, &info)) == NULL)
return (ENOBUFS);
ifam = mtod(m, struct ifa_msghdr *);
ifam->ifam_index = ifp->if_index;
ifam->ifam_metric = ifa->ifa_metric;
ifam->ifam_flags = ifa->ifa_flags;
ifam->ifam_addrs = info.rti_addrs;
if (fibnum != RT_ALL_FIBS) {
M_SETFIB(m, fibnum);
m->m_flags |= RTS_FILTER_FIB;
}
rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
return (0);
}
/*
* Announce route addition/removal.
* Please do not call directly, use rt_routemsg().
* Note that @rt data MAY be inconsistent/invalid:
* if some userland app sends us "invalid" route message (invalid mask,
* no dst, wrong address families, etc...) we need to pass it back
* to app (and any other rtsock consumers) with rtm_errno field set to
* non-zero value.
*
* Returns 0 on success.
*/
int
rtsock_routemsg(int cmd, struct ifnet *ifp, int error, struct rtentry *rt,
int fibnum)
{
struct rt_addrinfo info;
struct sockaddr *sa;
struct mbuf *m;
struct rt_msghdr *rtm;
if (route_cb.any_count == 0)
return (0);
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_DST] = sa = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
if ((m = rt_msg1(cmd, &info)) == NULL)
return (ENOBUFS);
rtm = mtod(m, struct rt_msghdr *);
rtm->rtm_index = ifp->if_index;
rtm->rtm_flags |= rt->rt_flags;
rtm->rtm_errno = error;
rtm->rtm_addrs = info.rti_addrs;
if (fibnum != RT_ALL_FIBS) {
M_SETFIB(m, fibnum);
m->m_flags |= RTS_FILTER_FIB;
}
rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
return (0);
}
/*
* This is the analogue to the rt_newaddrmsg which performs the same
* function but for multicast group memberhips. This is easier since
* there is no route state to worry about.
*/
void
rt_newmaddrmsg(int cmd, struct ifmultiaddr *ifma)
{
struct rt_addrinfo info;
struct mbuf *m = NULL;
struct ifnet *ifp = ifma->ifma_ifp;
struct ifma_msghdr *ifmam;
if (route_cb.any_count == 0)
return;
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_IFA] = ifma->ifma_addr;
info.rti_info[RTAX_IFP] = ifp ? ifp->if_addr->ifa_addr : NULL;
/*
* If a link-layer address is present, present it as a ``gateway''
* (similarly to how ARP entries, e.g., are presented).
*/
info.rti_info[RTAX_GATEWAY] = ifma->ifma_lladdr;
m = rt_msg1(cmd, &info);
if (m == NULL)
return;
ifmam = mtod(m, struct ifma_msghdr *);
KASSERT(ifp != NULL, ("%s: link-layer multicast address w/o ifp\n",
__func__));
ifmam->ifmam_index = ifp->if_index;
ifmam->ifmam_addrs = info.rti_addrs;
rt_dispatch(m, ifma->ifma_addr ? ifma->ifma_addr->sa_family : AF_UNSPEC);
}
static struct mbuf *
rt_makeifannouncemsg(struct ifnet *ifp, int type, int what,
struct rt_addrinfo *info)
{
struct if_announcemsghdr *ifan;
struct mbuf *m;
if (route_cb.any_count == 0)
return NULL;
bzero((caddr_t)info, sizeof(*info));
m = rt_msg1(type, info);
if (m != NULL) {
ifan = mtod(m, struct if_announcemsghdr *);
ifan->ifan_index = ifp->if_index;
strlcpy(ifan->ifan_name, ifp->if_xname,
sizeof(ifan->ifan_name));
ifan->ifan_what = what;
}
return m;
}
/*
* This is called to generate routing socket messages indicating
* IEEE80211 wireless events.
* XXX we piggyback on the RTM_IFANNOUNCE msg format in a clumsy way.
*/
void
rt_ieee80211msg(struct ifnet *ifp, int what, void *data, size_t data_len)
{
struct mbuf *m;
struct rt_addrinfo info;
m = rt_makeifannouncemsg(ifp, RTM_IEEE80211, what, &info);
if (m != NULL) {
/*
* Append the ieee80211 data. Try to stick it in the
* mbuf containing the ifannounce msg; otherwise allocate
* a new mbuf and append.
*
* NB: we assume m is a single mbuf.
*/
if (data_len > M_TRAILINGSPACE(m)) {
struct mbuf *n = m_get(M_NOWAIT, MT_DATA);
if (n == NULL) {
m_freem(m);
return;
}
bcopy(data, mtod(n, void *), data_len);
n->m_len = data_len;
m->m_next = n;
} else if (data_len > 0) {
bcopy(data, mtod(m, u_int8_t *) + m->m_len, data_len);
m->m_len += data_len;
}
if (m->m_flags & M_PKTHDR)
m->m_pkthdr.len += data_len;
mtod(m, struct if_announcemsghdr *)->ifan_msglen += data_len;
rt_dispatch(m, AF_UNSPEC);
}
}
/*
* This is called to generate routing socket messages indicating
* network interface arrival and departure.
*/
void
rt_ifannouncemsg(struct ifnet *ifp, int what)
{
struct mbuf *m;
struct rt_addrinfo info;
m = rt_makeifannouncemsg(ifp, RTM_IFANNOUNCE, what, &info);
if (m != NULL)
rt_dispatch(m, AF_UNSPEC);
}
static void
rt_dispatch(struct mbuf *m, sa_family_t saf)
{
struct m_tag *tag;
/*
* Preserve the family from the sockaddr, if any, in an m_tag for
* use when injecting the mbuf into the routing socket buffer from
* the netisr.
*/
if (saf != AF_UNSPEC) {
tag = m_tag_get(PACKET_TAG_RTSOCKFAM, sizeof(unsigned short),
M_NOWAIT);
if (tag == NULL) {
m_freem(m);
return;
}
*(unsigned short *)(tag + 1) = saf;
m_tag_prepend(m, tag);
}
#ifdef VIMAGE
if (V_loif)
m->m_pkthdr.rcvif = V_loif;
else {
m_freem(m);
return;
}
#endif
netisr_queue(NETISR_ROUTE, m); /* mbuf is free'd on failure. */
}
/*
* This is used in dumping the kernel table via sysctl().
*/
static int
sysctl_dumpentry(struct radix_node *rn, void *vw)
{
struct walkarg *w = vw;
struct rtentry *rt = (struct rtentry *)rn;
int error = 0, size;
struct rt_addrinfo info;
if (w->w_op == NET_RT_FLAGS && !(rt->rt_flags & w->w_arg))
return 0;
if ((rt->rt_flags & RTF_HOST) == 0
? jailed_without_vnet(w->w_req->td->td_ucred)
: prison_if(w->w_req->td->td_ucred, rt_key(rt)) != 0)
return (0);
bzero((caddr_t)&info, sizeof(info));
info.rti_info[RTAX_DST] = rt_key(rt);
info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
info.rti_info[RTAX_NETMASK] = rt_mask(rt);
info.rti_info[RTAX_GENMASK] = 0;
if (rt->rt_ifp) {
info.rti_info[RTAX_IFP] = rt->rt_ifp->if_addr->ifa_addr;
info.rti_info[RTAX_IFA] = rt->rt_ifa->ifa_addr;
if (rt->rt_ifp->if_flags & IFF_POINTOPOINT)
info.rti_info[RTAX_BRD] = rt->rt_ifa->ifa_dstaddr;
}
size = rt_msg2(RTM_GET, &info, NULL, w);
if (w->w_req && w->w_tmem) {
struct rt_msghdr *rtm = (struct rt_msghdr *)w->w_tmem;
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_index = rt->rt_ifp->if_index;
rtm->rtm_errno = rtm->rtm_pid = rtm->rtm_seq = 0;
rtm->rtm_addrs = info.rti_addrs;
error = SYSCTL_OUT(w->w_req, (caddr_t)rtm, size);
return (error);
}
return (error);
}
#ifdef COMPAT_FREEBSD32
static void
copy_ifdata32(struct if_data *src, struct if_data32 *dst)
{
bzero(dst, sizeof(*dst));
CP(*src, *dst, ifi_type);
CP(*src, *dst, ifi_physical);
CP(*src, *dst, ifi_addrlen);
CP(*src, *dst, ifi_hdrlen);
CP(*src, *dst, ifi_link_state);
CP(*src, *dst, ifi_vhid);
CP(*src, *dst, ifi_baudrate_pf);
dst->ifi_datalen = sizeof(struct if_data32);
CP(*src, *dst, ifi_mtu);
CP(*src, *dst, ifi_metric);
CP(*src, *dst, ifi_baudrate);
CP(*src, *dst, ifi_ipackets);
CP(*src, *dst, ifi_ierrors);
CP(*src, *dst, ifi_opackets);
CP(*src, *dst, ifi_oerrors);
CP(*src, *dst, ifi_collisions);
CP(*src, *dst, ifi_ibytes);
CP(*src, *dst, ifi_obytes);
CP(*src, *dst, ifi_imcasts);
CP(*src, *dst, ifi_omcasts);
CP(*src, *dst, ifi_iqdrops);
CP(*src, *dst, ifi_noproto);
CP(*src, *dst, ifi_hwassist);
CP(*src, *dst, ifi_epoch);
TV_CP(*src, *dst, ifi_lastchange);
}
#endif
static int
sysctl_iflist_ifml(struct ifnet *ifp, struct rt_addrinfo *info,
struct walkarg *w, int len)
{
struct if_msghdrl *ifm;
#ifdef COMPAT_FREEBSD32
if (w->w_req->flags & SCTL_MASK32) {
struct if_msghdrl32 *ifm32;
ifm32 = (struct if_msghdrl32 *)w->w_tmem;
ifm32->ifm_addrs = info->rti_addrs;
ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
ifm32->ifm_index = ifp->if_index;
ifm32->_ifm_spare1 = 0;
ifm32->ifm_len = sizeof(*ifm32);
ifm32->ifm_data_off = offsetof(struct if_msghdrl32, ifm_data);
copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
/* Fixup if_data carp(4) vhid. */
if (carp_get_vhid_p != NULL)
ifm32->ifm_data.ifi_vhid =
(*carp_get_vhid_p)(ifp->if_addr);
ifm32->ifm_data.ifi_oqdrops = ifp->if_snd.ifq_drops;
return (SYSCTL_OUT(w->w_req, (caddr_t)ifm32, len));
}
#endif
ifm = (struct if_msghdrl *)w->w_tmem;
ifm->ifm_addrs = info->rti_addrs;
ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
ifm->ifm_index = ifp->if_index;
ifm->_ifm_spare1 = 0;
ifm->ifm_len = sizeof(*ifm);
ifm->ifm_data_off = offsetof(struct if_msghdrl, ifm_data);
ifm->ifm_data = ifp->if_data;
/* Fixup if_data carp(4) vhid. */
if (carp_get_vhid_p != NULL)
ifm->ifm_data.ifi_vhid = (*carp_get_vhid_p)(ifp->if_addr);
ifm->ifm_data.ifi_datalen += sizeof(u_long);
ifm->ifi_oqdrops = ifp->if_snd.ifq_drops;
return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
}
static int
sysctl_iflist_ifm(struct ifnet *ifp, struct rt_addrinfo *info,
struct walkarg *w, int len)
{
struct if_msghdr *ifm;
#ifdef COMPAT_FREEBSD32
if (w->w_req->flags & SCTL_MASK32) {
struct if_msghdr32 *ifm32;
ifm32 = (struct if_msghdr32 *)w->w_tmem;
ifm32->ifm_addrs = info->rti_addrs;
ifm32->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
ifm32->ifm_index = ifp->if_index;
copy_ifdata32(&ifp->if_data, &ifm32->ifm_data);
/* Fixup if_data carp(4) vhid. */
if (carp_get_vhid_p != NULL)
ifm32->ifm_data.ifi_vhid =
(*carp_get_vhid_p)(ifp->if_addr);
return (SYSCTL_OUT(w->w_req, (caddr_t)ifm32, len));
}
#endif
ifm = (struct if_msghdr *)w->w_tmem;
ifm->ifm_addrs = info->rti_addrs;
ifm->ifm_flags = ifp->if_flags | ifp->if_drv_flags;
ifm->ifm_index = ifp->if_index;
ifm->ifm_data = ifp->if_data;
/* Fixup if_data carp(4) vhid. */
if (carp_get_vhid_p != NULL)
ifm->ifm_data.ifi_vhid = (*carp_get_vhid_p)(ifp->if_addr);
return (SYSCTL_OUT(w->w_req, (caddr_t)ifm, len));
}
static int
sysctl_iflist_ifaml(struct ifaddr *ifa, struct rt_addrinfo *info,
struct walkarg *w, int len)
{
struct ifa_msghdrl *ifam;
#ifdef COMPAT_FREEBSD32
if (w->w_req->flags & SCTL_MASK32) {
struct ifa_msghdrl32 *ifam32;
ifam32 = (struct ifa_msghdrl32 *)w->w_tmem;
ifam32->ifam_addrs = info->rti_addrs;
ifam32->ifam_flags = ifa->ifa_flags;
ifam32->ifam_index = ifa->ifa_ifp->if_index;
ifam32->_ifam_spare1 = 0;
ifam32->ifam_len = sizeof(*ifam32);
ifam32->ifam_data_off =
offsetof(struct ifa_msghdrl32, ifam_data);
ifam32->ifam_metric = ifa->ifa_metric;
copy_ifdata32(&ifa->ifa_ifp->if_data, &ifam32->ifam_data);
/* Fixup if_data carp(4) vhid. */
if (carp_get_vhid_p != NULL)
ifam32->ifam_data.ifi_vhid = (*carp_get_vhid_p)(ifa);
return (SYSCTL_OUT(w->w_req, (caddr_t)ifam32, len));
}
#endif
ifam = (struct ifa_msghdrl *)w->w_tmem;
ifam->ifam_addrs = info->rti_addrs;
ifam->ifam_flags = ifa->ifa_flags;
ifam->ifam_index = ifa->ifa_ifp->if_index;
ifam->_ifam_spare1 = 0;
ifam->ifam_len = sizeof(*ifam);
ifam->ifam_data_off = offsetof(struct ifa_msghdrl, ifam_data);
ifam->ifam_metric = ifa->ifa_metric;
ifam->ifam_data = ifa->if_data;
/* Fixup if_data carp(4) vhid. */
if (carp_get_vhid_p != NULL)
ifam->ifam_data.ifi_vhid = (*carp_get_vhid_p)(ifa);
return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
}
static int
sysctl_iflist_ifam(struct ifaddr *ifa, struct rt_addrinfo *info,
struct walkarg *w, int len)
{
struct ifa_msghdr *ifam;
ifam = (struct ifa_msghdr *)w->w_tmem;
ifam->ifam_addrs = info->rti_addrs;
ifam->ifam_flags = ifa->ifa_flags;
ifam->ifam_index = ifa->ifa_ifp->if_index;
ifam->ifam_metric = ifa->ifa_metric;
return (SYSCTL_OUT(w->w_req, w->w_tmem, len));
}
static int
sysctl_iflist(int af, struct walkarg *w)
{
struct ifnet *ifp;
struct ifaddr *ifa;
struct rt_addrinfo info;
int len, error = 0;
bzero((caddr_t)&info, sizeof(info));
IFNET_RLOCK_NOSLEEP();
TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
if (w->w_arg && w->w_arg != ifp->if_index)
continue;
IF_ADDR_RLOCK(ifp);
ifa = ifp->if_addr;
info.rti_info[RTAX_IFP] = ifa->ifa_addr;
len = rt_msg2(RTM_IFINFO, &info, NULL, w);
info.rti_info[RTAX_IFP] = NULL;
if (w->w_req && w->w_tmem) {
if (w->w_op == NET_RT_IFLISTL)
error = sysctl_iflist_ifml(ifp, &info, w, len);
else
error = sysctl_iflist_ifm(ifp, &info, w, len);
if (error)
goto done;
}
while ((ifa = TAILQ_NEXT(ifa, ifa_link)) != NULL) {
if (af && af != ifa->ifa_addr->sa_family)
continue;
if (prison_if(w->w_req->td->td_ucred,
ifa->ifa_addr) != 0)
continue;
info.rti_info[RTAX_IFA] = ifa->ifa_addr;
info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
len = rt_msg2(RTM_NEWADDR, &info, NULL, w);
if (w->w_req && w->w_tmem) {
if (w->w_op == NET_RT_IFLISTL)
error = sysctl_iflist_ifaml(ifa, &info,
w, len);
else
error = sysctl_iflist_ifam(ifa, &info,
w, len);
if (error)
goto done;
}
}
IF_ADDR_RUNLOCK(ifp);
info.rti_info[RTAX_IFA] = info.rti_info[RTAX_NETMASK] =
info.rti_info[RTAX_BRD] = NULL;
}
done:
if (ifp != NULL)
IF_ADDR_RUNLOCK(ifp);
IFNET_RUNLOCK_NOSLEEP();
return (error);
}
static int
sysctl_ifmalist(int af, struct walkarg *w)
{
struct ifnet *ifp;
struct ifmultiaddr *ifma;
struct rt_addrinfo info;
int len, error = 0;
struct ifaddr *ifa;
bzero((caddr_t)&info, sizeof(info));
IFNET_RLOCK_NOSLEEP();
TAILQ_FOREACH(ifp, &V_ifnet, if_link) {
if (w->w_arg && w->w_arg != ifp->if_index)
continue;
ifa = ifp->if_addr;
info.rti_info[RTAX_IFP] = ifa ? ifa->ifa_addr : NULL;
IF_ADDR_RLOCK(ifp);
TAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (af && af != ifma->ifma_addr->sa_family)
continue;
if (prison_if(w->w_req->td->td_ucred,
ifma->ifma_addr) != 0)
continue;
info.rti_info[RTAX_IFA] = ifma->ifma_addr;
info.rti_info[RTAX_GATEWAY] =
(ifma->ifma_addr->sa_family != AF_LINK) ?
ifma->ifma_lladdr : NULL;
len = rt_msg2(RTM_NEWMADDR, &info, NULL, w);
if (w->w_req && w->w_tmem) {
struct ifma_msghdr *ifmam;
ifmam = (struct ifma_msghdr *)w->w_tmem;
ifmam->ifmam_index = ifma->ifma_ifp->if_index;
ifmam->ifmam_flags = 0;
ifmam->ifmam_addrs = info.rti_addrs;
error = SYSCTL_OUT(w->w_req, w->w_tmem, len);
if (error) {
IF_ADDR_RUNLOCK(ifp);
goto done;
}
}
}
IF_ADDR_RUNLOCK(ifp);
}
done:
IFNET_RUNLOCK_NOSLEEP();
return (error);
}
static int
sysctl_rtsock(SYSCTL_HANDLER_ARGS)
{
int *name = (int *)arg1;
u_int namelen = arg2;
struct radix_node_head *rnh = NULL; /* silence compiler. */
int i, lim, error = EINVAL;
int fib = 0;
u_char af;
struct walkarg w;
name ++;
namelen--;
if (req->newptr)
return (EPERM);
if (name[1] == NET_RT_DUMP) {
if (namelen == 3)
fib = req->td->td_proc->p_fibnum;
else if (namelen == 4)
fib = (name[3] == RT_ALL_FIBS) ?
req->td->td_proc->p_fibnum : name[3];
else
return ((namelen < 3) ? EISDIR : ENOTDIR);
if (fib < 0 || fib >= rt_numfibs)
return (EINVAL);
} else if (namelen != 3)
return ((namelen < 3) ? EISDIR : ENOTDIR);
af = name[0];
if (af > AF_MAX)
return (EINVAL);
bzero(&w, sizeof(w));
w.w_op = name[1];
w.w_arg = name[2];
w.w_req = req;
error = sysctl_wire_old_buffer(req, 0);
if (error)
return (error);
switch (w.w_op) {
case NET_RT_DUMP:
case NET_RT_FLAGS:
if (af == 0) { /* dump all tables */
i = 1;
lim = AF_MAX;
} else /* dump only one table */
i = lim = af;
/*
* take care of llinfo entries, the caller must
* specify an AF
*/
if (w.w_op == NET_RT_FLAGS &&
(w.w_arg == 0 || w.w_arg & RTF_LLINFO)) {
if (af != 0)
error = lltable_sysctl_dumparp(af, w.w_req);
else
error = EINVAL;
break;
}
/*
* take care of routing entries
*/
for (error = 0; error == 0 && i <= lim; i++) {
rnh = rt_tables_get_rnh(fib, i);
if (rnh != NULL) {
RADIX_NODE_HEAD_RLOCK(rnh);
error = rnh->rnh_walktree(rnh,
sysctl_dumpentry, &w);
RADIX_NODE_HEAD_RUNLOCK(rnh);
} else if (af != 0)
error = EAFNOSUPPORT;
}
break;
case NET_RT_IFLIST:
case NET_RT_IFLISTL:
error = sysctl_iflist(af, &w);
break;
case NET_RT_IFMALIST:
error = sysctl_ifmalist(af, &w);
break;
}
if (w.w_tmem)
free(w.w_tmem, M_RTABLE);
return (error);
}
static SYSCTL_NODE(_net, PF_ROUTE, routetable, CTLFLAG_RD, sysctl_rtsock, "");
/*
* Definitions of protocols supported in the ROUTE domain.
*/
static struct domain routedomain; /* or at least forward */
static struct protosw routesw[] = {
{
.pr_type = SOCK_RAW,
.pr_domain = &routedomain,
.pr_flags = PR_ATOMIC|PR_ADDR,
.pr_output = route_output,
.pr_ctlinput = raw_ctlinput,
.pr_init = raw_init,
.pr_usrreqs = &route_usrreqs
}
};
static struct domain routedomain = {
.dom_family = PF_ROUTE,
.dom_name = "route",
.dom_protosw = routesw,
.dom_protoswNPROTOSW = &routesw[sizeof(routesw)/sizeof(routesw[0])]
};
VNET_DOMAIN_SET(route);