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NetBSD/sys/netinet/ip_input.c
chs fd34ea77eb remove checks for failure after memory allocation calls that cannot fail: 
kmem_alloc() with KM_SLEEP
  kmem_zalloc() with KM_SLEEP
  percpu_alloc()
  pserialize_create()
  psref_class_create()

all of these paths include an assertion that the allocation has not failed,
so callers should not assert that again.
2017-06-01 02:45:05 +00:00

1858 lines
49 KiB
C
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/* $NetBSD: ip_input.c,v 1.355 2017/06/01 02:45:14 chs Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*-
* Copyright (c) 1998 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Public Access Networks Corporation ("Panix"). It was developed under
* contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon.
*
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. 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 FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Copyright (c) 1982, 1986, 1988, 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.
*
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ip_input.c,v 1.355 2017/06/01 02:45:14 chs Exp $");
#ifdef _KERNEL_OPT
#include "opt_inet.h"
#include "opt_compat_netbsd.h"
#include "opt_gateway.h"
#include "opt_ipsec.h"
#include "opt_mrouting.h"
#include "opt_mbuftrace.h"
#include "opt_inet_csum.h"
#include "opt_net_mpsafe.h"
#endif
#include "arp.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/cpu.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/pool.h>
#include <sys/sysctl.h>
#include <sys/kauth.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/pktqueue.h>
#include <net/pfil.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_proto.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/ip_private.h>
#include <netinet/ip_icmp.h>
/* just for gif_ttl */
#include <netinet/in_gif.h>
#include "gif.h"
#include <net/if_gre.h>
#include "gre.h"
#ifdef MROUTING
#include <netinet/ip_mroute.h>
#endif
#include <netinet/portalgo.h>
#ifdef IPSEC
#include <netipsec/ipsec.h>
#endif
#ifndef IPFORWARDING
#ifdef GATEWAY
#define IPFORWARDING 1 /* forward IP packets not for us */
#else /* GATEWAY */
#define IPFORWARDING 0 /* don't forward IP packets not for us */
#endif /* GATEWAY */
#endif /* IPFORWARDING */
#ifndef IPSENDREDIRECTS
#define IPSENDREDIRECTS 1
#endif
#ifndef IPFORWSRCRT
#define IPFORWSRCRT 1 /* forward source-routed packets */
#endif
#ifndef IPALLOWSRCRT
#define IPALLOWSRCRT 1 /* allow source-routed packets */
#endif
#ifndef IPMTUDISC
#define IPMTUDISC 1
#endif
#ifndef IPMTUDISCTIMEOUT
#define IPMTUDISCTIMEOUT (10 * 60) /* as per RFC 1191 */
#endif
#ifdef COMPAT_50
#include <compat/sys/time.h>
#include <compat/sys/socket.h>
#endif
/*
* Note: DIRECTED_BROADCAST is handled this way so that previous
* configuration using this option will Just Work.
*/
#ifndef IPDIRECTEDBCAST
#ifdef DIRECTED_BROADCAST
#define IPDIRECTEDBCAST 1
#else
#define IPDIRECTEDBCAST 0
#endif /* DIRECTED_BROADCAST */
#endif /* IPDIRECTEDBCAST */
int ipforwarding = IPFORWARDING;
int ipsendredirects = IPSENDREDIRECTS;
int ip_defttl = IPDEFTTL;
int ip_forwsrcrt = IPFORWSRCRT;
int ip_directedbcast = IPDIRECTEDBCAST;
int ip_allowsrcrt = IPALLOWSRCRT;
int ip_mtudisc = IPMTUDISC;
int ip_mtudisc_timeout = IPMTUDISCTIMEOUT;
#ifdef DIAGNOSTIC
int ipprintfs = 0;
#endif
int ip_do_randomid = 0;
/*
* XXX - Setting ip_checkinterface mostly implements the receive side of
* the Strong ES model described in RFC 1122, but since the routing table
* and transmit implementation do not implement the Strong ES model,
* setting this to 1 results in an odd hybrid.
*
* XXX - ip_checkinterface currently must be disabled if you use ipnat
* to translate the destination address to another local interface.
*
* XXX - ip_checkinterface must be disabled if you add IP aliases
* to the loopback interface instead of the interface where the
* packets for those addresses are received.
*/
static int ip_checkinterface __read_mostly = 0;
struct rttimer_queue *ip_mtudisc_timeout_q = NULL;
pktqueue_t * ip_pktq __read_mostly;
pfil_head_t * inet_pfil_hook __read_mostly;
ipid_state_t * ip_ids __read_mostly;
percpu_t * ipstat_percpu __read_mostly;
static percpu_t *ipforward_rt_percpu __cacheline_aligned;
uint16_t ip_id;
#ifdef INET_CSUM_COUNTERS
#include <sys/device.h>
struct evcnt ip_hwcsum_bad = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
NULL, "inet", "hwcsum bad");
struct evcnt ip_hwcsum_ok = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
NULL, "inet", "hwcsum ok");
struct evcnt ip_swcsum = EVCNT_INITIALIZER(EVCNT_TYPE_MISC,
NULL, "inet", "swcsum");
#define INET_CSUM_COUNTER_INCR(ev) (ev)->ev_count++
EVCNT_ATTACH_STATIC(ip_hwcsum_bad);
EVCNT_ATTACH_STATIC(ip_hwcsum_ok);
EVCNT_ATTACH_STATIC(ip_swcsum);
#else
#define INET_CSUM_COUNTER_INCR(ev) /* nothing */
#endif /* INET_CSUM_COUNTERS */
/*
* Used to save the IP options in case a protocol wants to respond
* to an incoming packet over the same route if the packet got here
* using IP source routing. This allows connection establishment and
* maintenance when the remote end is on a network that is not known
* to us.
*/
struct ip_srcrt {
int isr_nhops; /* number of hops */
struct in_addr isr_dst; /* final destination */
char isr_nop; /* one NOP to align */
char isr_hdr[IPOPT_OFFSET + 1]; /* OPTVAL, OLEN & OFFSET */
struct in_addr isr_routes[MAX_IPOPTLEN/sizeof(struct in_addr)];
};
static int ip_drainwanted;
static void save_rte(struct mbuf *, u_char *, struct in_addr);
#ifdef MBUFTRACE
struct mowner ip_rx_mowner = MOWNER_INIT("internet", "rx");
struct mowner ip_tx_mowner = MOWNER_INIT("internet", "tx");
#endif
static void ipintr(void *);
static void ip_input(struct mbuf *);
static void ip_forward(struct mbuf *, int, struct ifnet *);
static bool ip_dooptions(struct mbuf *);
static struct in_ifaddr *ip_rtaddr(struct in_addr, struct psref *);
static void sysctl_net_inet_ip_setup(struct sysctllog **);
static struct in_ifaddr *ip_match_our_address(struct ifnet *, struct ip *,
int *);
static struct in_ifaddr *ip_match_our_address_broadcast(struct ifnet *,
struct ip *);
#ifdef NET_MPSAFE
#define SOFTNET_LOCK() mutex_enter(softnet_lock)
#define SOFTNET_UNLOCK() mutex_exit(softnet_lock)
#else
#define SOFTNET_LOCK() KASSERT(mutex_owned(softnet_lock))
#define SOFTNET_UNLOCK() KASSERT(mutex_owned(softnet_lock))
#endif
/*
* IP initialization: fill in IP protocol switch table.
* All protocols not implemented in kernel go to raw IP protocol handler.
*/
void
ip_init(void)
{
const struct protosw *pr;
in_init();
sysctl_net_inet_ip_setup(NULL);
pr = pffindproto(PF_INET, IPPROTO_RAW, SOCK_RAW);
KASSERT(pr != NULL);
ip_pktq = pktq_create(IFQ_MAXLEN, ipintr, NULL);
KASSERT(ip_pktq != NULL);
for (u_int i = 0; i < IPPROTO_MAX; i++) {
ip_protox[i] = pr - inetsw;
}
for (pr = inetdomain.dom_protosw;
pr < inetdomain.dom_protoswNPROTOSW; pr++)
if (pr->pr_domain->dom_family == PF_INET &&
pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
ip_protox[pr->pr_protocol] = pr - inetsw;
ip_reass_init();
ip_ids = ip_id_init();
ip_id = time_uptime & 0xfffff;
#ifdef GATEWAY
ipflow_init();
#endif
/* Register our Packet Filter hook. */
inet_pfil_hook = pfil_head_create(PFIL_TYPE_AF, (void *)AF_INET);
KASSERT(inet_pfil_hook != NULL);
#ifdef MBUFTRACE
MOWNER_ATTACH(&ip_tx_mowner);
MOWNER_ATTACH(&ip_rx_mowner);
#endif /* MBUFTRACE */
ipstat_percpu = percpu_alloc(sizeof(uint64_t) * IP_NSTATS);
ipforward_rt_percpu = percpu_alloc(sizeof(struct route));
ip_mtudisc_timeout_q = rt_timer_queue_create(ip_mtudisc_timeout);
}
static struct in_ifaddr *
ip_match_our_address(struct ifnet *ifp, struct ip *ip, int *downmatch)
{
struct in_ifaddr *ia = NULL;
int checkif;
/*
* Enable a consistency check between the destination address
* and the arrival interface for a unicast packet (the RFC 1122
* strong ES model) if IP forwarding is disabled and the packet
* is not locally generated.
*
* XXX - Checking also should be disabled if the destination
* address is ipnat'ed to a different interface.
*
* XXX - Checking is incompatible with IP aliases added
* to the loopback interface instead of the interface where
* the packets are received.
*
* XXX - We need to add a per ifaddr flag for this so that
* we get finer grain control.
*/
checkif = ip_checkinterface && (ipforwarding == 0) &&
(ifp->if_flags & IFF_LOOPBACK) == 0;
IN_ADDRHASH_READER_FOREACH(ia, ip->ip_dst.s_addr) {
if (in_hosteq(ia->ia_addr.sin_addr, ip->ip_dst)) {
if (ia->ia4_flags & IN_IFF_NOTREADY)
continue;
if (checkif && ia->ia_ifp != ifp)
continue;
if ((ia->ia_ifp->if_flags & IFF_UP) != 0 &&
(ia->ia4_flags & IN_IFF_DETACHED) == 0)
break;
else
(*downmatch)++;
}
}
return ia;
}
static struct in_ifaddr *
ip_match_our_address_broadcast(struct ifnet *ifp, struct ip *ip)
{
struct in_ifaddr *ia = NULL;
struct ifaddr *ifa;
IFADDR_READER_FOREACH(ifa, ifp) {
if (ifa->ifa_addr->sa_family != AF_INET)
continue;
ia = ifatoia(ifa);
if (ia->ia4_flags & (IN_IFF_NOTREADY | IN_IFF_DETACHED))
continue;
if (in_hosteq(ip->ip_dst, ia->ia_broadaddr.sin_addr) ||
in_hosteq(ip->ip_dst, ia->ia_netbroadcast) ||
/*
* Look for all-0's host part (old broadcast addr),
* either for subnet or net.
*/
ip->ip_dst.s_addr == ia->ia_subnet ||
ip->ip_dst.s_addr == ia->ia_net)
goto matched;
/*
* An interface with IP address zero accepts
* all packets that arrive on that interface.
*/
if (in_nullhost(ia->ia_addr.sin_addr))
goto matched;
}
ia = NULL;
matched:
return ia;
}
/*
* IP software interrupt routine.
*/
static void
ipintr(void *arg __unused)
{
struct mbuf *m;
KASSERT(cpu_softintr_p());
#ifndef NET_MPSAFE
mutex_enter(softnet_lock);
#endif
while ((m = pktq_dequeue(ip_pktq)) != NULL) {
ip_input(m);
}
#ifndef NET_MPSAFE
mutex_exit(softnet_lock);
#endif
}
/*
* IP input routine. Checksum and byte swap header. If fragmented
* try to reassemble. Process options. Pass to next level.
*/
static void
ip_input(struct mbuf *m)
{
struct ip *ip = NULL;
struct in_ifaddr *ia = NULL;
int hlen = 0, len;
int downmatch;
int srcrt = 0;
ifnet_t *ifp;
struct psref psref;
int s;
KASSERTMSG(cpu_softintr_p(), "ip_input: not in the software "
"interrupt handler; synchronization assumptions violated");
MCLAIM(m, &ip_rx_mowner);
KASSERT((m->m_flags & M_PKTHDR) != 0);
ifp = m_get_rcvif_psref(m, &psref);
if (__predict_false(ifp == NULL))
goto out;
/*
* If no IP addresses have been set yet but the interfaces
* are receiving, can't do anything with incoming packets yet.
* Note: we pre-check without locks held.
*/
if (IN_ADDRLIST_READER_EMPTY())
goto out;
IP_STATINC(IP_STAT_TOTAL);
/*
* If the IP header is not aligned, slurp it up into a new
* mbuf with space for link headers, in the event we forward
* it. Otherwise, if it is aligned, make sure the entire
* base IP header is in the first mbuf of the chain.
*/
if (IP_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
if ((m = m_copyup(m, sizeof(struct ip),
(max_linkhdr + 3) & ~3)) == NULL) {
/* XXXJRT new stat, please */
IP_STATINC(IP_STAT_TOOSMALL);
goto out;
}
} else if (__predict_false(m->m_len < sizeof (struct ip))) {
if ((m = m_pullup(m, sizeof (struct ip))) == NULL) {
IP_STATINC(IP_STAT_TOOSMALL);
goto out;
}
}
ip = mtod(m, struct ip *);
if (ip->ip_v != IPVERSION) {
IP_STATINC(IP_STAT_BADVERS);
goto out;
}
hlen = ip->ip_hl << 2;
if (hlen < sizeof(struct ip)) { /* minimum header length */
IP_STATINC(IP_STAT_BADHLEN);
goto out;
}
if (hlen > m->m_len) {
if ((m = m_pullup(m, hlen)) == NULL) {
IP_STATINC(IP_STAT_BADHLEN);
goto out;
}
ip = mtod(m, struct ip *);
}
/*
* RFC1122: packets with a multicast source address are
* not allowed.
*/
if (IN_MULTICAST(ip->ip_src.s_addr)) {
IP_STATINC(IP_STAT_BADADDR);
goto out;
}
/* 127/8 must not appear on wire - RFC1122 */
if ((ntohl(ip->ip_dst.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET ||
(ntohl(ip->ip_src.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET) {
if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
IP_STATINC(IP_STAT_BADADDR);
goto out;
}
}
switch (m->m_pkthdr.csum_flags &
((ifp->if_csum_flags_rx & M_CSUM_IPv4) |
M_CSUM_IPv4_BAD)) {
case M_CSUM_IPv4|M_CSUM_IPv4_BAD:
INET_CSUM_COUNTER_INCR(&ip_hwcsum_bad);
IP_STATINC(IP_STAT_BADSUM);
goto out;
case M_CSUM_IPv4:
/* Checksum was okay. */
INET_CSUM_COUNTER_INCR(&ip_hwcsum_ok);
break;
default:
/*
* Must compute it ourselves. Maybe skip checksum on
* loopback interfaces.
*/
if (__predict_true(!(ifp->if_flags & IFF_LOOPBACK) ||
ip_do_loopback_cksum)) {
INET_CSUM_COUNTER_INCR(&ip_swcsum);
if (in_cksum(m, hlen) != 0) {
IP_STATINC(IP_STAT_BADSUM);
goto out;
}
}
break;
}
/* Retrieve the packet length. */
len = ntohs(ip->ip_len);
/*
* Check for additional length bogosity
*/
if (len < hlen) {
IP_STATINC(IP_STAT_BADLEN);
goto out;
}
/*
* Check that the amount of data in the buffers
* is as at least much as the IP header would have us expect.
* Trim mbufs if longer than we expect.
* Drop packet if shorter than we expect.
*/
if (m->m_pkthdr.len < len) {
IP_STATINC(IP_STAT_TOOSHORT);
goto out;
}
if (m->m_pkthdr.len > len) {
if (m->m_len == m->m_pkthdr.len) {
m->m_len = len;
m->m_pkthdr.len = len;
} else
m_adj(m, len - m->m_pkthdr.len);
}
/*
* Assume that we can create a fast-forward IP flow entry
* based on this packet.
*/
m->m_flags |= M_CANFASTFWD;
/*
* Run through list of hooks for input packets. If there are any
* filters which require that additional packets in the flow are
* not fast-forwarded, they must clear the M_CANFASTFWD flag.
* Note that filters must _never_ set this flag, as another filter
* in the list may have previously cleared it.
*/
#if defined(IPSEC)
if (!ipsec_used || !ipsec_indone(m))
#else
if (1)
#endif
{
struct in_addr odst = ip->ip_dst;
bool freed;
freed = pfil_run_hooks(inet_pfil_hook, &m, ifp, PFIL_IN) != 0;
if (freed || m == NULL) {
m = NULL;
goto out;
}
ip = mtod(m, struct ip *);
hlen = ip->ip_hl << 2;
/*
* XXX The setting of "srcrt" here is to prevent ip_forward()
* from generating ICMP redirects for packets that have
* been redirected by a hook back out on to the same LAN that
* they came from and is not an indication that the packet
* is being inffluenced by source routing options. This
* allows things like
* "rdr tlp0 0/0 port 80 -> 1.1.1.200 3128 tcp"
* where tlp0 is both on the 1.1.1.0/24 network and is the
* default route for hosts on 1.1.1.0/24. Of course this
* also requires a "map tlp0 ..." to complete the story.
* One might argue whether or not this kind of network config.
* should be supported in this manner...
*/
srcrt = (odst.s_addr != ip->ip_dst.s_addr);
}
#ifdef ALTQ
/* XXX Temporary until ALTQ is changed to use a pfil hook */
if (altq_input) {
SOFTNET_LOCK();
if ((*altq_input)(m, AF_INET) == 0) {
/* Packet dropped by traffic conditioner. */
SOFTNET_UNLOCK();
m = NULL;
goto out;
}
SOFTNET_UNLOCK();
}
#endif
/*
* Process options and, if not destined for us,
* ship it on. ip_dooptions returns 1 when an
* error was detected (causing an icmp message
* to be sent and the original packet to be freed).
*/
if (hlen > sizeof (struct ip) && ip_dooptions(m)) {
m = NULL;
goto out;
}
/*
* Check our list of addresses, to see if the packet is for us.
*
* Traditional 4.4BSD did not consult IFF_UP at all.
* The behavior here is to treat addresses on !IFF_UP interface
* or IN_IFF_NOTREADY addresses as not mine.
*/
downmatch = 0;
s = pserialize_read_enter();
ia = ip_match_our_address(ifp, ip, &downmatch);
if (ia != NULL) {
pserialize_read_exit(s);
goto ours;
}
if (ifp->if_flags & IFF_BROADCAST) {
ia = ip_match_our_address_broadcast(ifp, ip);
if (ia != NULL) {
pserialize_read_exit(s);
goto ours;
}
}
pserialize_read_exit(s);
if (IN_MULTICAST(ip->ip_dst.s_addr)) {
#ifdef MROUTING
extern struct socket *ip_mrouter;
if (ip_mrouter) {
/*
* If we are acting as a multicast router, all
* incoming multicast packets are passed to the
* kernel-level multicast forwarding function.
* The packet is returned (relatively) intact; if
* ip_mforward() returns a non-zero value, the packet
* must be discarded, else it may be accepted below.
*
* (The IP ident field is put in the same byte order
* as expected when ip_mforward() is called from
* ip_output().)
*/
SOFTNET_LOCK();
if (ip_mforward(m, ifp) != 0) {
SOFTNET_UNLOCK();
IP_STATINC(IP_STAT_CANTFORWARD);
goto out;
}
SOFTNET_UNLOCK();
/*
* The process-level routing demon needs to receive
* all multicast IGMP packets, whether or not this
* host belongs to their destination groups.
*/
if (ip->ip_p == IPPROTO_IGMP) {
goto ours;
}
IP_STATINC(IP_STAT_CANTFORWARD);
}
#endif
/*
* See if we belong to the destination multicast group on the
* arrival interface.
*/
if (!in_multi_group(ip->ip_dst, ifp, 0)) {
IP_STATINC(IP_STAT_CANTFORWARD);
goto out;
}
goto ours;
}
if (ip->ip_dst.s_addr == INADDR_BROADCAST ||
in_nullhost(ip->ip_dst))
goto ours;
/*
* Not for us; forward if possible and desirable.
*/
if (ipforwarding == 0) {
m_put_rcvif_psref(ifp, &psref);
IP_STATINC(IP_STAT_CANTFORWARD);
m_freem(m);
} else {
/*
* If ip_dst matched any of my address on !IFF_UP interface,
* and there's no IFF_UP interface that matches ip_dst,
* send icmp unreach. Forwarding it will result in in-kernel
* forwarding loop till TTL goes to 0.
*/
if (downmatch) {
m_put_rcvif_psref(ifp, &psref);
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_HOST, 0, 0);
IP_STATINC(IP_STAT_CANTFORWARD);
return;
}
#ifdef IPSEC
/* Perform IPsec, if any. */
if (ipsec_used) {
SOFTNET_LOCK();
if (ipsec4_input(m, IP_FORWARDING |
(ip_directedbcast ? IP_ALLOWBROADCAST : 0)) != 0) {
SOFTNET_UNLOCK();
goto out;
}
SOFTNET_UNLOCK();
}
#endif
ip_forward(m, srcrt, ifp);
m_put_rcvif_psref(ifp, &psref);
}
return;
ours:
m_put_rcvif_psref(ifp, &psref);
ifp = NULL;
/*
* If offset or IP_MF are set, must reassemble.
*/
if (ip->ip_off & ~htons(IP_DF|IP_RF)) {
/*
* Pass to IP reassembly mechanism.
*/
if (ip_reass_packet(&m, ip) != 0) {
/* Failed; invalid fragment(s) or packet. */
goto out;
}
if (m == NULL) {
/* More fragments should come; silently return. */
goto out;
}
/*
* Reassembly is done, we have the final packet.
* Updated cached data in local variable(s).
*/
ip = mtod(m, struct ip *);
hlen = ip->ip_hl << 2;
}
#ifdef IPSEC
/*
* Enforce IPsec policy checking if we are seeing last header.
* Note that we do not visit this with protocols with PCB layer
* code - like UDP/TCP/raw IP.
*/
if (ipsec_used &&
(inetsw[ip_protox[ip->ip_p]].pr_flags & PR_LASTHDR) != 0) {
SOFTNET_LOCK();
if (ipsec4_input(m, 0) != 0) {
SOFTNET_UNLOCK();
goto out;
}
SOFTNET_UNLOCK();
}
#endif
/*
* Switch out to protocol's input routine.
*/
#if IFA_STATS
if (ia && ip) {
struct in_ifaddr *_ia;
/*
* Keep a reference from ip_match_our_address with psref
* is expensive, so explore ia here again.
*/
s = pserialize_read_enter();
_ia = in_get_ia(ip->ip_dst);
_ia->ia_ifa.ifa_data.ifad_inbytes += ntohs(ip->ip_len);
pserialize_read_exit(s);
}
#endif
IP_STATINC(IP_STAT_DELIVERED);
const int off = hlen, nh = ip->ip_p;
SOFTNET_LOCK();
(*inetsw[ip_protox[nh]].pr_input)(m, off, nh);
SOFTNET_UNLOCK();
return;
out:
m_put_rcvif_psref(ifp, &psref);
if (m != NULL)
m_freem(m);
}
/*
* IP timer processing.
*/
void
ip_slowtimo(void)
{
#ifndef NET_MPSAFE
mutex_enter(softnet_lock);
KERNEL_LOCK(1, NULL);
#endif
ip_reass_slowtimo();
#ifndef NET_MPSAFE
KERNEL_UNLOCK_ONE(NULL);
mutex_exit(softnet_lock);
#endif
}
/*
* IP drain processing.
*/
void
ip_drain(void)
{
KERNEL_LOCK(1, NULL);
ip_reass_drain();
KERNEL_UNLOCK_ONE(NULL);
}
/*
* ip_dooptions: perform option processing on a datagram, possibly discarding
* it if bad options are encountered, or forwarding it if source-routed.
*
* => Returns true if packet has been forwarded/freed.
* => Returns false if the packet should be processed further.
*/
static bool
ip_dooptions(struct mbuf *m)
{
struct ip *ip = mtod(m, struct ip *);
u_char *cp, *cp0;
struct ip_timestamp *ipt;
struct in_ifaddr *ia;
int opt, optlen, cnt, off, code, type = ICMP_PARAMPROB, forward = 0;
struct in_addr dst;
n_time ntime;
struct ifaddr *ifa = NULL;
int s;
dst = ip->ip_dst;
cp = (u_char *)(ip + 1);
cnt = (ip->ip_hl << 2) - sizeof (struct ip);
for (; cnt > 0; cnt -= optlen, cp += optlen) {
opt = cp[IPOPT_OPTVAL];
if (opt == IPOPT_EOL)
break;
if (opt == IPOPT_NOP)
optlen = 1;
else {
if (cnt < IPOPT_OLEN + sizeof(*cp)) {
code = &cp[IPOPT_OLEN] - (u_char *)ip;
goto bad;
}
optlen = cp[IPOPT_OLEN];
if (optlen < IPOPT_OLEN + sizeof(*cp) || optlen > cnt) {
code = &cp[IPOPT_OLEN] - (u_char *)ip;
goto bad;
}
}
switch (opt) {
default:
break;
/*
* Source routing with record.
* Find interface with current destination address.
* If none on this machine then drop if strictly routed,
* or do nothing if loosely routed.
* Record interface address and bring up next address
* component. If strictly routed make sure next
* address is on directly accessible net.
*/
case IPOPT_LSRR:
case IPOPT_SSRR: {
struct psref psref;
struct sockaddr_in ipaddr = {
.sin_len = sizeof(ipaddr),
.sin_family = AF_INET,
};
if (ip_allowsrcrt == 0) {
type = ICMP_UNREACH;
code = ICMP_UNREACH_NET_PROHIB;
goto bad;
}
if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
code = &cp[IPOPT_OLEN] - (u_char *)ip;
goto bad;
}
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
goto bad;
}
ipaddr.sin_addr = ip->ip_dst;
s = pserialize_read_enter();
ifa = ifa_ifwithaddr(sintosa(&ipaddr));
if (ifa == NULL) {
pserialize_read_exit(s);
if (opt == IPOPT_SSRR) {
type = ICMP_UNREACH;
code = ICMP_UNREACH_SRCFAIL;
goto bad;
}
/*
* Loose routing, and not at next destination
* yet; nothing to do except forward.
*/
break;
}
pserialize_read_exit(s);
off--; /* 0 origin */
if ((off + sizeof(struct in_addr)) > optlen) {
/*
* End of source route. Should be for us.
*/
save_rte(m, cp, ip->ip_src);
break;
}
/*
* locate outgoing interface
*/
memcpy((void *)&ipaddr.sin_addr, (void *)(cp + off),
sizeof(ipaddr.sin_addr));
if (opt == IPOPT_SSRR) {
ifa = ifa_ifwithladdr_psref(sintosa(&ipaddr),
&psref);
if (ifa != NULL)
ia = ifatoia(ifa);
else
ia = NULL;
} else {
ia = ip_rtaddr(ipaddr.sin_addr, &psref);
}
if (ia == NULL) {
type = ICMP_UNREACH;
code = ICMP_UNREACH_SRCFAIL;
goto bad;
}
ip->ip_dst = ipaddr.sin_addr;
bcopy((void *)&ia->ia_addr.sin_addr,
(void *)(cp + off), sizeof(struct in_addr));
ia4_release(ia, &psref);
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
/*
* Let ip_intr's mcast routing check handle mcast pkts
*/
forward = !IN_MULTICAST(ip->ip_dst.s_addr);
break;
}
case IPOPT_RR: {
struct psref psref;
struct sockaddr_in ipaddr = {
.sin_len = sizeof(ipaddr),
.sin_family = AF_INET,
};
if (optlen < IPOPT_OFFSET + sizeof(*cp)) {
code = &cp[IPOPT_OLEN] - (u_char *)ip;
goto bad;
}
if ((off = cp[IPOPT_OFFSET]) < IPOPT_MINOFF) {
code = &cp[IPOPT_OFFSET] - (u_char *)ip;
goto bad;
}
/*
* If no space remains, ignore.
*/
off--; /* 0 origin */
if ((off + sizeof(struct in_addr)) > optlen)
break;
memcpy((void *)&ipaddr.sin_addr, (void *)(&ip->ip_dst),
sizeof(ipaddr.sin_addr));
/*
* locate outgoing interface; if we're the destination,
* use the incoming interface (should be same).
*/
ifa = ifa_ifwithaddr_psref(sintosa(&ipaddr), &psref);
if (ifa == NULL) {
ia = ip_rtaddr(ipaddr.sin_addr, &psref);
if (ia == NULL) {
type = ICMP_UNREACH;
code = ICMP_UNREACH_HOST;
goto bad;
}
} else {
ia = ifatoia(ifa);
}
bcopy((void *)&ia->ia_addr.sin_addr,
(void *)(cp + off), sizeof(struct in_addr));
ia4_release(ia, &psref);
cp[IPOPT_OFFSET] += sizeof(struct in_addr);
break;
}
case IPOPT_TS:
code = cp - (u_char *)ip;
ipt = (struct ip_timestamp *)cp;
if (ipt->ipt_len < 4 || ipt->ipt_len > 40) {
code = (u_char *)&ipt->ipt_len - (u_char *)ip;
goto bad;
}
if (ipt->ipt_ptr < 5) {
code = (u_char *)&ipt->ipt_ptr - (u_char *)ip;
goto bad;
}
if (ipt->ipt_ptr > ipt->ipt_len - sizeof (int32_t)) {
if (++ipt->ipt_oflw == 0) {
code = (u_char *)&ipt->ipt_ptr -
(u_char *)ip;
goto bad;
}
break;
}
cp0 = (cp + ipt->ipt_ptr - 1);
switch (ipt->ipt_flg) {
case IPOPT_TS_TSONLY:
break;
case IPOPT_TS_TSANDADDR: {
struct ifnet *rcvif;
int _s, _ss;
struct sockaddr_in ipaddr = {
.sin_len = sizeof(ipaddr),
.sin_family = AF_INET,
};
if (ipt->ipt_ptr - 1 + sizeof(n_time) +
sizeof(struct in_addr) > ipt->ipt_len) {
code = (u_char *)&ipt->ipt_ptr -
(u_char *)ip;
goto bad;
}
ipaddr.sin_addr = dst;
_ss = pserialize_read_enter();
rcvif = m_get_rcvif(m, &_s);
if (__predict_true(rcvif != NULL)) {
ifa = ifaof_ifpforaddr(sintosa(&ipaddr),
rcvif);
}
m_put_rcvif(rcvif, &_s);
if (ifa == NULL) {
pserialize_read_exit(_ss);
break;
}
ia = ifatoia(ifa);
bcopy(&ia->ia_addr.sin_addr,
cp0, sizeof(struct in_addr));
pserialize_read_exit(_ss);
ipt->ipt_ptr += sizeof(struct in_addr);
break;
}
case IPOPT_TS_PRESPEC: {
struct sockaddr_in ipaddr = {
.sin_len = sizeof(ipaddr),
.sin_family = AF_INET,
};
if (ipt->ipt_ptr - 1 + sizeof(n_time) +
sizeof(struct in_addr) > ipt->ipt_len) {
code = (u_char *)&ipt->ipt_ptr -
(u_char *)ip;
goto bad;
}
memcpy(&ipaddr.sin_addr, cp0,
sizeof(struct in_addr));
s = pserialize_read_enter();
ifa = ifa_ifwithaddr(sintosa(&ipaddr));
if (ifa == NULL) {
pserialize_read_exit(s);
continue;
}
pserialize_read_exit(s);
ipt->ipt_ptr += sizeof(struct in_addr);
break;
}
default:
/* XXX can't take &ipt->ipt_flg */
code = (u_char *)&ipt->ipt_ptr -
(u_char *)ip + 1;
goto bad;
}
ntime = iptime();
cp0 = (u_char *) &ntime; /* XXX grumble, GCC... */
memmove((char *)cp + ipt->ipt_ptr - 1, cp0,
sizeof(n_time));
ipt->ipt_ptr += sizeof(n_time);
}
}
if (forward) {
struct ifnet *rcvif;
struct psref _psref;
if (ip_forwsrcrt == 0) {
type = ICMP_UNREACH;
code = ICMP_UNREACH_SRCFAIL;
goto bad;
}
rcvif = m_get_rcvif_psref(m, &_psref);
if (__predict_false(rcvif == NULL)) {
type = ICMP_UNREACH;
code = ICMP_UNREACH_HOST;
goto bad;
}
ip_forward(m, 1, rcvif);
m_put_rcvif_psref(rcvif, &_psref);
return true;
}
return false;
bad:
icmp_error(m, type, code, 0, 0);
IP_STATINC(IP_STAT_BADOPTIONS);
return true;
}
/*
* ip_rtaddr: given address of next destination (final or next hop),
* return internet address info of interface to be used to get there.
*/
static struct in_ifaddr *
ip_rtaddr(struct in_addr dst, struct psref *psref)
{
struct rtentry *rt;
union {
struct sockaddr dst;
struct sockaddr_in dst4;
} u;
struct route *ro;
sockaddr_in_init(&u.dst4, &dst, 0);
ro = percpu_getref(ipforward_rt_percpu);
rt = rtcache_lookup(ro, &u.dst);
if (rt == NULL) {
percpu_putref(ipforward_rt_percpu);
return NULL;
}
ia4_acquire(ifatoia(rt->rt_ifa), psref);
rtcache_unref(rt, ro);
percpu_putref(ipforward_rt_percpu);
return ifatoia(rt->rt_ifa);
}
/*
* save_rte: save incoming source route for use in replies, to be picked
* up later by ip_srcroute if the receiver is interested.
*/
static void
save_rte(struct mbuf *m, u_char *option, struct in_addr dst)
{
struct ip_srcrt *isr;
struct m_tag *mtag;
unsigned olen;
olen = option[IPOPT_OLEN];
if (olen > sizeof(isr->isr_hdr) + sizeof(isr->isr_routes))
return;
mtag = m_tag_get(PACKET_TAG_SRCROUTE, sizeof(*isr), M_NOWAIT);
if (mtag == NULL)
return;
isr = (struct ip_srcrt *)(mtag + 1);
memcpy(isr->isr_hdr, option, olen);
isr->isr_nhops = (olen - IPOPT_OFFSET - 1) / sizeof(struct in_addr);
isr->isr_dst = dst;
m_tag_prepend(m, mtag);
}
/*
* Retrieve incoming source route for use in replies,
* in the same form used by setsockopt.
* The first hop is placed before the options, will be removed later.
*/
struct mbuf *
ip_srcroute(struct mbuf *m0)
{
struct in_addr *p, *q;
struct mbuf *m;
struct ip_srcrt *isr;
struct m_tag *mtag;
mtag = m_tag_find(m0, PACKET_TAG_SRCROUTE, NULL);
if (mtag == NULL)
return NULL;
isr = (struct ip_srcrt *)(mtag + 1);
if (isr->isr_nhops == 0)
return NULL;
m = m_get(M_DONTWAIT, MT_SOOPTS);
if (m == NULL)
return NULL;
MCLAIM(m, &inetdomain.dom_mowner);
#define OPTSIZ (sizeof(isr->isr_nop) + sizeof(isr->isr_hdr))
/* length is (nhops+1)*sizeof(addr) + sizeof(nop + header) */
m->m_len = (isr->isr_nhops + 1) * sizeof(struct in_addr) + OPTSIZ;
/*
* First save first hop for return route
*/
p = &(isr->isr_routes[isr->isr_nhops - 1]);
*(mtod(m, struct in_addr *)) = *p--;
/*
* Copy option fields and padding (nop) to mbuf.
*/
isr->isr_nop = IPOPT_NOP;
isr->isr_hdr[IPOPT_OFFSET] = IPOPT_MINOFF;
memmove(mtod(m, char *) + sizeof(struct in_addr), &isr->isr_nop,
OPTSIZ);
q = (struct in_addr *)(mtod(m, char *) +
sizeof(struct in_addr) + OPTSIZ);
#undef OPTSIZ
/*
* Record return path as an IP source route,
* reversing the path (pointers are now aligned).
*/
while (p >= isr->isr_routes) {
*q++ = *p--;
}
/*
* Last hop goes to final destination.
*/
*q = isr->isr_dst;
m_tag_delete(m0, mtag);
return m;
}
const int inetctlerrmap[PRC_NCMDS] = {
[PRC_MSGSIZE] = EMSGSIZE,
[PRC_HOSTDEAD] = EHOSTDOWN,
[PRC_HOSTUNREACH] = EHOSTUNREACH,
[PRC_UNREACH_NET] = EHOSTUNREACH,
[PRC_UNREACH_HOST] = EHOSTUNREACH,
[PRC_UNREACH_PROTOCOL] = ECONNREFUSED,
[PRC_UNREACH_PORT] = ECONNREFUSED,
[PRC_UNREACH_SRCFAIL] = EHOSTUNREACH,
[PRC_PARAMPROB] = ENOPROTOOPT,
};
void
ip_fasttimo(void)
{
if (ip_drainwanted) {
ip_drain();
ip_drainwanted = 0;
}
}
void
ip_drainstub(void)
{
ip_drainwanted = 1;
}
/*
* Forward a packet. If some error occurs return the sender
* an icmp packet. Note we can't always generate a meaningful
* icmp message because icmp doesn't have a large enough repertoire
* of codes and types.
*
* If not forwarding, just drop the packet. This could be confusing
* if ipforwarding was zero but some routing protocol was advancing
* us as a gateway to somewhere. However, we must let the routing
* protocol deal with that.
*
* The srcrt parameter indicates whether the packet is being forwarded
* via a source route.
*/
static void
ip_forward(struct mbuf *m, int srcrt, struct ifnet *rcvif)
{
struct ip *ip = mtod(m, struct ip *);
struct rtentry *rt;
int error, type = 0, code = 0, destmtu = 0;
struct mbuf *mcopy;
n_long dest;
union {
struct sockaddr dst;
struct sockaddr_in dst4;
} u;
uint64_t *ips;
struct route *ro;
KASSERTMSG(cpu_softintr_p(), "ip_forward: not in the software "
"interrupt handler; synchronization assumptions violated");
/*
* We are now in the output path.
*/
MCLAIM(m, &ip_tx_mowner);
/*
* Clear any in-bound checksum flags for this packet.
*/
m->m_pkthdr.csum_flags = 0;
dest = 0;
if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
IP_STATINC(IP_STAT_CANTFORWARD);
m_freem(m);
return;
}
if (ip->ip_ttl <= IPTTLDEC) {
icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, dest, 0);
return;
}
sockaddr_in_init(&u.dst4, &ip->ip_dst, 0);
ro = percpu_getref(ipforward_rt_percpu);
rt = rtcache_lookup(ro, &u.dst);
if (rt == NULL) {
percpu_putref(ipforward_rt_percpu);
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_NET, dest, 0);
return;
}
/*
* Save at most 68 bytes of the packet in case
* we need to generate an ICMP message to the src.
* Pullup to avoid sharing mbuf cluster between m and mcopy.
*/
mcopy = m_copym(m, 0, imin(ntohs(ip->ip_len), 68), M_DONTWAIT);
if (mcopy)
mcopy = m_pullup(mcopy, ip->ip_hl << 2);
ip->ip_ttl -= IPTTLDEC;
/*
* If forwarding packet using same interface that it came in on,
* perhaps should send a redirect to sender to shortcut a hop.
* Only send redirect if source is sending directly to us,
* and if packet was not source routed (or has any options).
* Also, don't send redirect if forwarding using a default route
* or a route modified by a redirect.
*/
if (rt->rt_ifp == rcvif &&
(rt->rt_flags & (RTF_DYNAMIC|RTF_MODIFIED)) == 0 &&
!in_nullhost(satocsin(rt_getkey(rt))->sin_addr) &&
ipsendredirects && !srcrt) {
if (rt->rt_ifa &&
(ip->ip_src.s_addr & ifatoia(rt->rt_ifa)->ia_subnetmask) ==
ifatoia(rt->rt_ifa)->ia_subnet) {
if (rt->rt_flags & RTF_GATEWAY)
dest = satosin(rt->rt_gateway)->sin_addr.s_addr;
else
dest = ip->ip_dst.s_addr;
/*
* Router requirements says to only send host
* redirects.
*/
type = ICMP_REDIRECT;
code = ICMP_REDIRECT_HOST;
}
}
rtcache_unref(rt, ro);
error = ip_output(m, NULL, ro,
(IP_FORWARDING | (ip_directedbcast ? IP_ALLOWBROADCAST : 0)),
NULL, NULL);
if (error) {
IP_STATINC(IP_STAT_CANTFORWARD);
goto error;
}
ips = IP_STAT_GETREF();
ips[IP_STAT_FORWARD]++;
if (type) {
ips[IP_STAT_REDIRECTSENT]++;
IP_STAT_PUTREF();
goto redirect;
}
IP_STAT_PUTREF();
if (mcopy) {
#ifdef GATEWAY
if (mcopy->m_flags & M_CANFASTFWD)
ipflow_create(ro, mcopy);
#endif
m_freem(mcopy);
}
percpu_putref(ipforward_rt_percpu);
return;
redirect:
error:
if (mcopy == NULL) {
percpu_putref(ipforward_rt_percpu);
return;
}
switch (error) {
case 0: /* forwarded, but need redirect */
/* type, code set above */
break;
case ENETUNREACH: /* shouldn't happen, checked above */
case EHOSTUNREACH:
case ENETDOWN:
case EHOSTDOWN:
default:
type = ICMP_UNREACH;
code = ICMP_UNREACH_HOST;
break;
case EMSGSIZE:
type = ICMP_UNREACH;
code = ICMP_UNREACH_NEEDFRAG;
if ((rt = rtcache_validate(ro)) != NULL) {
destmtu = rt->rt_ifp->if_mtu;
rtcache_unref(rt, ro);
}
#ifdef IPSEC
if (ipsec_used)
(void)ipsec4_forward(mcopy, &destmtu);
#endif
IP_STATINC(IP_STAT_CANTFRAG);
break;
case ENOBUFS:
/*
* Do not generate ICMP_SOURCEQUENCH as required in RFC 1812,
* Requirements for IP Version 4 Routers. Source quench can
* big problem under DoS attacks or if the underlying
* interface is rate-limited.
*/
if (mcopy)
m_freem(mcopy);
percpu_putref(ipforward_rt_percpu);
return;
}
icmp_error(mcopy, type, code, dest, destmtu);
percpu_putref(ipforward_rt_percpu);
}
void
ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
struct mbuf *m)
{
struct socket *so = inp->inp_socket;
ifnet_t *ifp;
int inpflags = inp->inp_flags;
struct psref psref;
ifp = m_get_rcvif_psref(m, &psref);
if (__predict_false(ifp == NULL))
return; /* XXX should report error? */
if (so->so_options & SO_TIMESTAMP
#ifdef SO_OTIMESTAMP
|| so->so_options & SO_OTIMESTAMP
#endif
) {
struct timeval tv;
microtime(&tv);
#ifdef SO_OTIMESTAMP
if (so->so_options & SO_OTIMESTAMP) {
struct timeval50 tv50;
timeval_to_timeval50(&tv, &tv50);
*mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
SCM_OTIMESTAMP, SOL_SOCKET);
} else
#endif
*mp = sbcreatecontrol((void *) &tv, sizeof(tv),
SCM_TIMESTAMP, SOL_SOCKET);
if (*mp)
mp = &(*mp)->m_next;
}
if (inpflags & INP_RECVDSTADDR) {
*mp = sbcreatecontrol((void *) &ip->ip_dst,
sizeof(struct in_addr), IP_RECVDSTADDR, IPPROTO_IP);
if (*mp)
mp = &(*mp)->m_next;
}
if (inpflags & INP_RECVPKTINFO) {
struct in_pktinfo ipi;
ipi.ipi_addr = ip->ip_src;
ipi.ipi_ifindex = ifp->if_index;
*mp = sbcreatecontrol((void *) &ipi,
sizeof(ipi), IP_RECVPKTINFO, IPPROTO_IP);
if (*mp)
mp = &(*mp)->m_next;
}
if (inpflags & INP_PKTINFO) {
struct in_pktinfo ipi;
ipi.ipi_addr = ip->ip_dst;
ipi.ipi_ifindex = ifp->if_index;
*mp = sbcreatecontrol((void *) &ipi,
sizeof(ipi), IP_PKTINFO, IPPROTO_IP);
if (*mp)
mp = &(*mp)->m_next;
}
if (inpflags & INP_RECVIF) {
struct sockaddr_dl sdl;
sockaddr_dl_init(&sdl, sizeof(sdl), ifp->if_index, 0, NULL, 0,
NULL, 0);
*mp = sbcreatecontrol(&sdl, sdl.sdl_len, IP_RECVIF, IPPROTO_IP);
if (*mp)
mp = &(*mp)->m_next;
}
if (inpflags & INP_RECVTTL) {
*mp = sbcreatecontrol((void *) &ip->ip_ttl,
sizeof(uint8_t), IP_RECVTTL, IPPROTO_IP);
if (*mp)
mp = &(*mp)->m_next;
}
m_put_rcvif_psref(ifp, &psref);
}
/*
* sysctl helper routine for net.inet.ip.forwsrcrt.
*/
static int
sysctl_net_inet_ip_forwsrcrt(SYSCTLFN_ARGS)
{
int error, tmp;
struct sysctlnode node;
node = *rnode;
tmp = ip_forwsrcrt;
node.sysctl_data = &tmp;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);
error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_FORWSRCRT,
0, NULL, NULL, NULL);
if (error)
return (error);
ip_forwsrcrt = tmp;
return (0);
}
/*
* sysctl helper routine for net.inet.ip.mtudisctimeout. checks the
* range of the new value and tweaks timers if it changes.
*/
static int
sysctl_net_inet_ip_pmtudto(SYSCTLFN_ARGS)
{
int error, tmp;
struct sysctlnode node;
icmp_mtudisc_lock();
node = *rnode;
tmp = ip_mtudisc_timeout;
node.sysctl_data = &tmp;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
goto out;
if (tmp < 0) {
error = EINVAL;
goto out;
}
ip_mtudisc_timeout = tmp;
rt_timer_queue_change(ip_mtudisc_timeout_q, ip_mtudisc_timeout);
error = 0;
out:
icmp_mtudisc_unlock();
return error;
}
static int
sysctl_net_inet_ip_stats(SYSCTLFN_ARGS)
{
return (NETSTAT_SYSCTL(ipstat_percpu, IP_NSTATS));
}
static void
sysctl_net_inet_ip_setup(struct sysctllog **clog)
{
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "inet",
SYSCTL_DESCR("PF_INET related settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_INET, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "ip",
SYSCTL_DESCR("IPv4 related settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_INET, IPPROTO_IP, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "forwarding",
SYSCTL_DESCR("Enable forwarding of INET datagrams"),
NULL, 0, &ipforwarding, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_FORWARDING, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "redirect",
SYSCTL_DESCR("Enable sending of ICMP redirect messages"),
NULL, 0, &ipsendredirects, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_SENDREDIRECTS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "ttl",
SYSCTL_DESCR("Default TTL for an INET datagram"),
NULL, 0, &ip_defttl, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_DEFTTL, CTL_EOL);
#ifdef IPCTL_DEFMTU
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT /* |CTLFLAG_READWRITE? */,
CTLTYPE_INT, "mtu",
SYSCTL_DESCR("Default MTA for an INET route"),
NULL, 0, &ip_mtu, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_DEFMTU, CTL_EOL);
#endif /* IPCTL_DEFMTU */
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "forwsrcrt",
SYSCTL_DESCR("Enable forwarding of source-routed "
"datagrams"),
sysctl_net_inet_ip_forwsrcrt, 0, &ip_forwsrcrt, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_FORWSRCRT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "directed-broadcast",
SYSCTL_DESCR("Enable forwarding of broadcast datagrams"),
NULL, 0, &ip_directedbcast, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_DIRECTEDBCAST, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "allowsrcrt",
SYSCTL_DESCR("Accept source-routed datagrams"),
NULL, 0, &ip_allowsrcrt, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_ALLOWSRCRT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "mtudisc",
SYSCTL_DESCR("Use RFC1191 Path MTU Discovery"),
NULL, 0, &ip_mtudisc, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_MTUDISC, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "anonportmin",
SYSCTL_DESCR("Lowest ephemeral port number to assign"),
sysctl_net_inet_ip_ports, 0, &anonportmin, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_ANONPORTMIN, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "anonportmax",
SYSCTL_DESCR("Highest ephemeral port number to assign"),
sysctl_net_inet_ip_ports, 0, &anonportmax, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_ANONPORTMAX, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "mtudisctimeout",
SYSCTL_DESCR("Lifetime of a Path MTU Discovered route"),
sysctl_net_inet_ip_pmtudto, 0, (void *)&ip_mtudisc_timeout, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_MTUDISCTIMEOUT, CTL_EOL);
#ifndef IPNOPRIVPORTS
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "lowportmin",
SYSCTL_DESCR("Lowest privileged ephemeral port number "
"to assign"),
sysctl_net_inet_ip_ports, 0, &lowportmin, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_LOWPORTMIN, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "lowportmax",
SYSCTL_DESCR("Highest privileged ephemeral port number "
"to assign"),
sysctl_net_inet_ip_ports, 0, &lowportmax, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_LOWPORTMAX, CTL_EOL);
#endif /* IPNOPRIVPORTS */
#if NGRE > 0
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "grettl",
SYSCTL_DESCR("Default TTL for a gre tunnel datagram"),
NULL, 0, &ip_gre_ttl, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_GRE_TTL, CTL_EOL);
#endif /* NGRE */
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "checkinterface",
SYSCTL_DESCR("Enable receive side of Strong ES model "
"from RFC1122"),
NULL, 0, &ip_checkinterface, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_CHECKINTERFACE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "random_id",
SYSCTL_DESCR("Assign random ip_id values"),
NULL, 0, &ip_do_randomid, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_RANDOMID, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "do_loopback_cksum",
SYSCTL_DESCR("Perform IP checksum on loopback"),
NULL, 0, &ip_do_loopback_cksum, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_LOOPBACKCKSUM, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "stats",
SYSCTL_DESCR("IP statistics"),
sysctl_net_inet_ip_stats, 0, NULL, 0,
CTL_NET, PF_INET, IPPROTO_IP, IPCTL_STATS,
CTL_EOL);
#if NARP
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "dad_count",
SYSCTL_DESCR("Number of Duplicate Address Detection "
"probes to send"),
NULL, 0, &ip_dad_count, 0,
CTL_NET, PF_INET, IPPROTO_IP,
IPCTL_DAD_COUNT, CTL_EOL);
#endif
/* anonportalgo RFC6056 subtree */
const struct sysctlnode *portalgo_node;
sysctl_createv(clog, 0, NULL, &portalgo_node,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "anonportalgo",
SYSCTL_DESCR("Anonymous Port Algorithm Selection (RFC 6056)"),
NULL, 0, NULL, 0,
CTL_NET, PF_INET, IPPROTO_IP, CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &portalgo_node, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRING, "available",
SYSCTL_DESCR("available algorithms"),
sysctl_portalgo_available, 0, NULL, PORTALGO_MAXLEN,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &portalgo_node, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_STRING, "selected",
SYSCTL_DESCR("selected algorithm"),
sysctl_portalgo_selected4, 0, NULL, PORTALGO_MAXLEN,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, &portalgo_node, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_STRUCT, "reserve",
SYSCTL_DESCR("bitmap of reserved ports"),
sysctl_portalgo_reserve4, 0, NULL, 0,
CTL_CREATE, CTL_EOL);
}
void
ip_statinc(u_int stat)
{
KASSERT(stat < IP_NSTATS);
IP_STATINC(stat);
}
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