In the original design of the network stack from the protocol control input method pr_ctlinput was used notify the protocols about two very different kinds of events: internal system events and receival of an ICMP messages from outside. These events were coded with PRC_ codes. Today these methods are removed from the protosw(9) and are isolated to IPv4 and IPv6 stacks and are called only from icmp*_input(). The PRC_ codes now just create a shim layer between ICMP codes and errors or actions taken by protocols. - Change ipproto_ctlinput_t to pass just pointer to ICMP header. This allows protocols to not deduct it from the internal IP header. - Change ip6proto_ctlinput_t to pass just struct ip6ctlparam pointer. It has all the information needed to the protocols. In the structure, change ip6c_finaldst fields to sockaddr_in6. The reason is that icmp6_input() already has this address wrapped in sockaddr, and the protocols want this address as sockaddr. - For UDP tunneling control input, as well as for IPSEC control input, change the prototypes to accept a transparent union of either ICMP header pointer or struct ip6ctlparam pointer. - In icmp_input() and icmp6_input() do only validation of ICMP header and count bad packets. The translation of ICMP codes to errors/actions is done by protocols. - Provide icmp_errmap() and icmp6_errmap() as substitute to inetctlerrmap, inet6ctlerrmap arrays. - In protocol ctlinput methods either trust what icmp_errmap() recommend, or do our own logic based on the ICMP header. Differential revision: https://reviews.freebsd.org/D36731
1366 lines
36 KiB
C
1366 lines
36 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1982, 1986, 1988, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)ip_input.c 8.2 (Berkeley) 1/4/94
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_bootp.h"
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#include "opt_ipstealth.h"
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#include "opt_ipsec.h"
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#include "opt_route.h"
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#include "opt_rss.h"
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#include "opt_sctp.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/hhook.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/rmlock.h>
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#include <sys/rwlock.h>
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#include <sys/sdt.h>
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#include <sys/syslog.h>
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#include <sys/sysctl.h>
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#include <net/if.h>
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#include <net/if_types.h>
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#include <net/if_var.h>
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#include <net/if_dl.h>
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#include <net/pfil.h>
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#include <net/route.h>
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#include <net/route/nhop.h>
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#include <net/netisr.h>
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#include <net/rss_config.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_kdtrace.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip.h>
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#include <netinet/in_fib.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_encap.h>
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#include <netinet/ip_fw.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/igmp_var.h>
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#include <netinet/ip_options.h>
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#include <machine/in_cksum.h>
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#include <netinet/ip_carp.h>
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#include <netinet/in_rss.h>
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#ifdef SCTP
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#include <netinet/sctp_var.h>
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#endif
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#include <netipsec/ipsec_support.h>
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#include <sys/socketvar.h>
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#include <security/mac/mac_framework.h>
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#ifdef CTASSERT
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CTASSERT(sizeof(struct ip) == 20);
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#endif
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/* IP reassembly functions are defined in ip_reass.c. */
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extern void ipreass_init(void);
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extern void ipreass_vnet_init(void);
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#ifdef VIMAGE
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extern void ipreass_destroy(void);
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#endif
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VNET_DEFINE(int, rsvp_on);
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VNET_DEFINE(int, ipforwarding);
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SYSCTL_INT(_net_inet_ip, IPCTL_FORWARDING, forwarding, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ipforwarding), 0,
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"Enable IP forwarding between interfaces");
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/*
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* Respond with an ICMP host redirect when we forward a packet out of
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* the same interface on which it was received. See RFC 792.
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*/
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VNET_DEFINE(int, ipsendredirects) = 1;
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SYSCTL_INT(_net_inet_ip, IPCTL_SENDREDIRECTS, redirect, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ipsendredirects), 0,
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"Enable sending IP redirects");
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VNET_DEFINE_STATIC(bool, ip_strong_es) = false;
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#define V_ip_strong_es VNET(ip_strong_es)
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SYSCTL_BOOL(_net_inet_ip, OID_AUTO, rfc1122_strong_es,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_strong_es), false,
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"Packet's IP destination address must match address on arrival interface");
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VNET_DEFINE_STATIC(bool, ip_sav) = true;
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#define V_ip_sav VNET(ip_sav)
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SYSCTL_BOOL(_net_inet_ip, OID_AUTO, source_address_validation,
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CTLFLAG_VNET | CTLFLAG_RW, &VNET_NAME(ip_sav), true,
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"Drop incoming packets with source address that is a local address");
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VNET_DEFINE(pfil_head_t, inet_pfil_head); /* Packet filter hooks */
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static struct netisr_handler ip_nh = {
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.nh_name = "ip",
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.nh_handler = ip_input,
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.nh_proto = NETISR_IP,
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#ifdef RSS
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.nh_m2cpuid = rss_soft_m2cpuid_v4,
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.nh_policy = NETISR_POLICY_CPU,
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.nh_dispatch = NETISR_DISPATCH_HYBRID,
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#else
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.nh_policy = NETISR_POLICY_FLOW,
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#endif
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};
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#ifdef RSS
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/*
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* Directly dispatched frames are currently assumed
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* to have a flowid already calculated.
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*
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* It should likely have something that assert it
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* actually has valid flow details.
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*/
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static struct netisr_handler ip_direct_nh = {
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.nh_name = "ip_direct",
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.nh_handler = ip_direct_input,
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.nh_proto = NETISR_IP_DIRECT,
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.nh_m2cpuid = rss_soft_m2cpuid_v4,
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.nh_policy = NETISR_POLICY_CPU,
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.nh_dispatch = NETISR_DISPATCH_HYBRID,
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};
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#endif
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ipproto_input_t *ip_protox[IPPROTO_MAX] = {
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[0 ... IPPROTO_MAX - 1] = rip_input };
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ipproto_ctlinput_t *ip_ctlprotox[IPPROTO_MAX] = {
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[0 ... IPPROTO_MAX - 1] = rip_ctlinput };
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VNET_DEFINE(struct in_ifaddrhead, in_ifaddrhead); /* first inet address */
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VNET_DEFINE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); /* inet addr hash table */
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VNET_DEFINE(u_long, in_ifaddrhmask); /* mask for hash table */
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/* Make sure it is safe to use hashinit(9) on CK_LIST. */
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CTASSERT(sizeof(struct in_ifaddrhashhead) == sizeof(LIST_HEAD(, in_addr)));
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#ifdef IPCTL_DEFMTU
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SYSCTL_INT(_net_inet_ip, IPCTL_DEFMTU, mtu, CTLFLAG_RW,
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&ip_mtu, 0, "Default MTU");
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#endif
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#ifdef IPSTEALTH
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VNET_DEFINE(int, ipstealth);
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SYSCTL_INT(_net_inet_ip, OID_AUTO, stealth, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ipstealth), 0,
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"IP stealth mode, no TTL decrementation on forwarding");
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#endif
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/*
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* IP statistics are stored in the "array" of counter(9)s.
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*/
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VNET_PCPUSTAT_DEFINE(struct ipstat, ipstat);
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VNET_PCPUSTAT_SYSINIT(ipstat);
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SYSCTL_VNET_PCPUSTAT(_net_inet_ip, IPCTL_STATS, stats, struct ipstat, ipstat,
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"IP statistics (struct ipstat, netinet/ip_var.h)");
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#ifdef VIMAGE
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VNET_PCPUSTAT_SYSUNINIT(ipstat);
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#endif /* VIMAGE */
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/*
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* Kernel module interface for updating ipstat. The argument is an index
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* into ipstat treated as an array.
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*/
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void
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kmod_ipstat_inc(int statnum)
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{
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counter_u64_add(VNET(ipstat)[statnum], 1);
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}
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void
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kmod_ipstat_dec(int statnum)
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{
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counter_u64_add(VNET(ipstat)[statnum], -1);
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}
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static int
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sysctl_netinet_intr_queue_maxlen(SYSCTL_HANDLER_ARGS)
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{
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int error, qlimit;
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netisr_getqlimit(&ip_nh, &qlimit);
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error = sysctl_handle_int(oidp, &qlimit, 0, req);
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if (error || !req->newptr)
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return (error);
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if (qlimit < 1)
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return (EINVAL);
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return (netisr_setqlimit(&ip_nh, qlimit));
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}
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SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQMAXLEN, intr_queue_maxlen,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE, 0, 0,
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sysctl_netinet_intr_queue_maxlen, "I",
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"Maximum size of the IP input queue");
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static int
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sysctl_netinet_intr_queue_drops(SYSCTL_HANDLER_ARGS)
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{
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u_int64_t qdrops_long;
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int error, qdrops;
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netisr_getqdrops(&ip_nh, &qdrops_long);
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qdrops = qdrops_long;
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error = sysctl_handle_int(oidp, &qdrops, 0, req);
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if (error || !req->newptr)
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return (error);
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if (qdrops != 0)
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return (EINVAL);
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netisr_clearqdrops(&ip_nh);
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return (0);
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}
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SYSCTL_PROC(_net_inet_ip, IPCTL_INTRQDROPS, intr_queue_drops,
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CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE,
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0, 0, sysctl_netinet_intr_queue_drops, "I",
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"Number of packets dropped from the IP input queue");
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#ifdef RSS
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static int
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sysctl_netinet_intr_direct_queue_maxlen(SYSCTL_HANDLER_ARGS)
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{
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int error, qlimit;
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netisr_getqlimit(&ip_direct_nh, &qlimit);
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error = sysctl_handle_int(oidp, &qlimit, 0, req);
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if (error || !req->newptr)
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return (error);
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if (qlimit < 1)
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return (EINVAL);
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return (netisr_setqlimit(&ip_direct_nh, qlimit));
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}
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SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQMAXLEN, intr_direct_queue_maxlen,
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CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_MPSAFE,
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0, 0, sysctl_netinet_intr_direct_queue_maxlen,
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"I", "Maximum size of the IP direct input queue");
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static int
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sysctl_netinet_intr_direct_queue_drops(SYSCTL_HANDLER_ARGS)
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{
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u_int64_t qdrops_long;
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int error, qdrops;
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netisr_getqdrops(&ip_direct_nh, &qdrops_long);
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qdrops = qdrops_long;
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error = sysctl_handle_int(oidp, &qdrops, 0, req);
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if (error || !req->newptr)
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return (error);
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if (qdrops != 0)
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return (EINVAL);
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netisr_clearqdrops(&ip_direct_nh);
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return (0);
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}
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SYSCTL_PROC(_net_inet_ip, IPCTL_INTRDQDROPS, intr_direct_queue_drops,
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CTLTYPE_INT | CTLFLAG_RD | CTLFLAG_MPSAFE, 0, 0,
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sysctl_netinet_intr_direct_queue_drops, "I",
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"Number of packets dropped from the IP direct input queue");
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#endif /* RSS */
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/*
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* IP initialization: fill in IP protocol switch table.
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* All protocols not implemented in kernel go to raw IP protocol handler.
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*/
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static void
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ip_vnet_init(void *arg __unused)
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{
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struct pfil_head_args args;
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CK_STAILQ_INIT(&V_in_ifaddrhead);
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V_in_ifaddrhashtbl = hashinit(INADDR_NHASH, M_IFADDR, &V_in_ifaddrhmask);
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/* Initialize IP reassembly queue. */
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ipreass_vnet_init();
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/* Initialize packet filter hooks. */
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args.pa_version = PFIL_VERSION;
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args.pa_flags = PFIL_IN | PFIL_OUT;
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args.pa_type = PFIL_TYPE_IP4;
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args.pa_headname = PFIL_INET_NAME;
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V_inet_pfil_head = pfil_head_register(&args);
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if (hhook_head_register(HHOOK_TYPE_IPSEC_IN, AF_INET,
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&V_ipsec_hhh_in[HHOOK_IPSEC_INET],
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HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
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printf("%s: WARNING: unable to register input helper hook\n",
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__func__);
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if (hhook_head_register(HHOOK_TYPE_IPSEC_OUT, AF_INET,
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&V_ipsec_hhh_out[HHOOK_IPSEC_INET],
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HHOOK_WAITOK | HHOOK_HEADISINVNET) != 0)
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printf("%s: WARNING: unable to register output helper hook\n",
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__func__);
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|
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#ifdef VIMAGE
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netisr_register_vnet(&ip_nh);
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#ifdef RSS
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netisr_register_vnet(&ip_direct_nh);
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#endif
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#endif
|
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}
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VNET_SYSINIT(ip_vnet_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH,
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ip_vnet_init, NULL);
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static void
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ip_init(const void *unused __unused)
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{
|
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|
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ipreass_init();
|
|
|
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/*
|
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* Register statically compiled protocols, that are unlikely to
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* ever become dynamic.
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*/
|
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IPPROTO_REGISTER(IPPROTO_ICMP, icmp_input, NULL);
|
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IPPROTO_REGISTER(IPPROTO_IGMP, igmp_input, NULL);
|
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IPPROTO_REGISTER(IPPROTO_RSVP, rsvp_input, NULL);
|
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IPPROTO_REGISTER(IPPROTO_IPV4, encap4_input, NULL);
|
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IPPROTO_REGISTER(IPPROTO_MOBILE, encap4_input, NULL);
|
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IPPROTO_REGISTER(IPPROTO_ETHERIP, encap4_input, NULL);
|
|
IPPROTO_REGISTER(IPPROTO_GRE, encap4_input, NULL);
|
|
IPPROTO_REGISTER(IPPROTO_IPV6, encap4_input, NULL);
|
|
IPPROTO_REGISTER(IPPROTO_PIM, encap4_input, NULL);
|
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#ifdef SCTP /* XXX: has a loadable & static version */
|
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IPPROTO_REGISTER(IPPROTO_SCTP, sctp_input, sctp_ctlinput);
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#endif
|
|
|
|
netisr_register(&ip_nh);
|
|
#ifdef RSS
|
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netisr_register(&ip_direct_nh);
|
|
#endif
|
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}
|
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SYSINIT(ip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_init, NULL);
|
|
|
|
#ifdef VIMAGE
|
|
static void
|
|
ip_destroy(void *unused __unused)
|
|
{
|
|
int error;
|
|
|
|
#ifdef RSS
|
|
netisr_unregister_vnet(&ip_direct_nh);
|
|
#endif
|
|
netisr_unregister_vnet(&ip_nh);
|
|
|
|
pfil_head_unregister(V_inet_pfil_head);
|
|
error = hhook_head_deregister(V_ipsec_hhh_in[HHOOK_IPSEC_INET]);
|
|
if (error != 0) {
|
|
printf("%s: WARNING: unable to deregister input helper hook "
|
|
"type HHOOK_TYPE_IPSEC_IN, id HHOOK_IPSEC_INET: "
|
|
"error %d returned\n", __func__, error);
|
|
}
|
|
error = hhook_head_deregister(V_ipsec_hhh_out[HHOOK_IPSEC_INET]);
|
|
if (error != 0) {
|
|
printf("%s: WARNING: unable to deregister output helper hook "
|
|
"type HHOOK_TYPE_IPSEC_OUT, id HHOOK_IPSEC_INET: "
|
|
"error %d returned\n", __func__, error);
|
|
}
|
|
|
|
/* Remove the IPv4 addresses from all interfaces. */
|
|
in_ifscrub_all();
|
|
|
|
/* Make sure the IPv4 routes are gone as well. */
|
|
rib_flush_routes_family(AF_INET);
|
|
|
|
/* Destroy IP reassembly queue. */
|
|
ipreass_destroy();
|
|
|
|
/* Cleanup in_ifaddr hash table; should be empty. */
|
|
hashdestroy(V_in_ifaddrhashtbl, M_IFADDR, V_in_ifaddrhmask);
|
|
}
|
|
|
|
VNET_SYSUNINIT(ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, ip_destroy, NULL);
|
|
#endif
|
|
|
|
#ifdef RSS
|
|
/*
|
|
* IP direct input routine.
|
|
*
|
|
* This is called when reinjecting completed fragments where
|
|
* all of the previous checking and book-keeping has been done.
|
|
*/
|
|
void
|
|
ip_direct_input(struct mbuf *m)
|
|
{
|
|
struct ip *ip;
|
|
int hlen;
|
|
|
|
ip = mtod(m, struct ip *);
|
|
hlen = ip->ip_hl << 2;
|
|
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
if (IPSEC_ENABLED(ipv4)) {
|
|
if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0)
|
|
return;
|
|
}
|
|
#endif /* IPSEC */
|
|
IPSTAT_INC(ips_delivered);
|
|
ip_protox[ip->ip_p](&m, &hlen, ip->ip_p);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Ip input routine. Checksum and byte swap header. If fragmented
|
|
* try to reassemble. Process options. Pass to next level.
|
|
*/
|
|
void
|
|
ip_input(struct mbuf *m)
|
|
{
|
|
struct ip *ip = NULL;
|
|
struct in_ifaddr *ia = NULL;
|
|
struct ifaddr *ifa;
|
|
struct ifnet *ifp;
|
|
int hlen = 0;
|
|
uint16_t sum, ip_len;
|
|
int dchg = 0; /* dest changed after fw */
|
|
struct in_addr odst; /* original dst address */
|
|
bool strong_es;
|
|
|
|
M_ASSERTPKTHDR(m);
|
|
NET_EPOCH_ASSERT();
|
|
|
|
if (m->m_flags & M_FASTFWD_OURS) {
|
|
m->m_flags &= ~M_FASTFWD_OURS;
|
|
/* Set up some basics that will be used later. */
|
|
ip = mtod(m, struct ip *);
|
|
hlen = ip->ip_hl << 2;
|
|
ip_len = ntohs(ip->ip_len);
|
|
goto ours;
|
|
}
|
|
|
|
IPSTAT_INC(ips_total);
|
|
|
|
if (__predict_false(m->m_pkthdr.len < sizeof(struct ip)))
|
|
goto tooshort;
|
|
|
|
if (m->m_len < sizeof(struct ip)) {
|
|
m = m_pullup(m, sizeof(struct ip));
|
|
if (__predict_false(m == NULL)) {
|
|
IPSTAT_INC(ips_toosmall);
|
|
return;
|
|
}
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
|
|
if (__predict_false(ip->ip_v != IPVERSION)) {
|
|
IPSTAT_INC(ips_badvers);
|
|
goto bad;
|
|
}
|
|
|
|
hlen = ip->ip_hl << 2;
|
|
if (__predict_false(hlen < sizeof(struct ip))) { /* minimum header length */
|
|
IPSTAT_INC(ips_badhlen);
|
|
goto bad;
|
|
}
|
|
if (hlen > m->m_len) {
|
|
m = m_pullup(m, hlen);
|
|
if (__predict_false(m == NULL)) {
|
|
IPSTAT_INC(ips_badhlen);
|
|
return;
|
|
}
|
|
ip = mtod(m, struct ip *);
|
|
}
|
|
|
|
IP_PROBE(receive, NULL, NULL, ip, m->m_pkthdr.rcvif, ip, NULL);
|
|
|
|
/* IN_LOOPBACK must not appear on the wire - RFC1122 */
|
|
ifp = m->m_pkthdr.rcvif;
|
|
if (IN_LOOPBACK(ntohl(ip->ip_dst.s_addr)) ||
|
|
IN_LOOPBACK(ntohl(ip->ip_src.s_addr))) {
|
|
if ((ifp->if_flags & IFF_LOOPBACK) == 0) {
|
|
IPSTAT_INC(ips_badaddr);
|
|
goto bad;
|
|
}
|
|
}
|
|
|
|
if (m->m_pkthdr.csum_flags & CSUM_IP_CHECKED) {
|
|
sum = !(m->m_pkthdr.csum_flags & CSUM_IP_VALID);
|
|
} else {
|
|
if (hlen == sizeof(struct ip)) {
|
|
sum = in_cksum_hdr(ip);
|
|
} else {
|
|
sum = in_cksum(m, hlen);
|
|
}
|
|
}
|
|
if (__predict_false(sum)) {
|
|
IPSTAT_INC(ips_badsum);
|
|
goto bad;
|
|
}
|
|
|
|
ip_len = ntohs(ip->ip_len);
|
|
if (__predict_false(ip_len < hlen)) {
|
|
IPSTAT_INC(ips_badlen);
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* 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 (__predict_false(m->m_pkthdr.len < ip_len)) {
|
|
tooshort:
|
|
IPSTAT_INC(ips_tooshort);
|
|
goto bad;
|
|
}
|
|
if (m->m_pkthdr.len > ip_len) {
|
|
if (m->m_len == m->m_pkthdr.len) {
|
|
m->m_len = ip_len;
|
|
m->m_pkthdr.len = ip_len;
|
|
} else
|
|
m_adj(m, ip_len - m->m_pkthdr.len);
|
|
}
|
|
|
|
/*
|
|
* Try to forward the packet, but if we fail continue.
|
|
* ip_tryforward() may generate redirects these days.
|
|
* XXX the logic below falling through to normal processing
|
|
* if redirects are required should be revisited as well.
|
|
* ip_tryforward() does inbound and outbound packet firewall
|
|
* processing. If firewall has decided that destination becomes
|
|
* our local address, it sets M_FASTFWD_OURS flag. In this
|
|
* case skip another inbound firewall processing and update
|
|
* ip pointer.
|
|
*/
|
|
if (V_ipforwarding != 0
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
&& (!IPSEC_ENABLED(ipv4) ||
|
|
IPSEC_CAPS(ipv4, m, IPSEC_CAP_OPERABLE) == 0)
|
|
#endif
|
|
) {
|
|
/*
|
|
* ip_dooptions() was run so we can ignore the source route (or
|
|
* any IP options case) case for redirects in ip_tryforward().
|
|
*/
|
|
if ((m = ip_tryforward(m)) == NULL)
|
|
return;
|
|
if (m->m_flags & M_FASTFWD_OURS) {
|
|
m->m_flags &= ~M_FASTFWD_OURS;
|
|
ip = mtod(m, struct ip *);
|
|
goto ours;
|
|
}
|
|
}
|
|
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
/*
|
|
* Bypass packet filtering for packets previously handled by IPsec.
|
|
*/
|
|
if (IPSEC_ENABLED(ipv4) &&
|
|
IPSEC_CAPS(ipv4, m, IPSEC_CAP_BYPASS_FILTER) != 0)
|
|
goto passin;
|
|
#endif
|
|
|
|
/*
|
|
* Run through list of hooks for input packets.
|
|
*
|
|
* NB: Beware of the destination address changing (e.g.
|
|
* by NAT rewriting). When this happens, tell
|
|
* ip_forward to do the right thing.
|
|
*/
|
|
|
|
/* Jump over all PFIL processing if hooks are not active. */
|
|
if (!PFIL_HOOKED_IN(V_inet_pfil_head))
|
|
goto passin;
|
|
|
|
odst = ip->ip_dst;
|
|
if (pfil_mbuf_in(V_inet_pfil_head, &m, ifp, NULL) !=
|
|
PFIL_PASS)
|
|
return;
|
|
if (m == NULL) /* consumed by filter */
|
|
return;
|
|
|
|
ip = mtod(m, struct ip *);
|
|
dchg = (odst.s_addr != ip->ip_dst.s_addr);
|
|
|
|
if (m->m_flags & M_FASTFWD_OURS) {
|
|
m->m_flags &= ~M_FASTFWD_OURS;
|
|
goto ours;
|
|
}
|
|
if (m->m_flags & M_IP_NEXTHOP) {
|
|
if (m_tag_find(m, PACKET_TAG_IPFORWARD, NULL) != NULL) {
|
|
/*
|
|
* Directly ship the packet on. This allows
|
|
* forwarding packets originally destined to us
|
|
* to some other directly connected host.
|
|
*/
|
|
ip_forward(m, 1);
|
|
return;
|
|
}
|
|
}
|
|
passin:
|
|
|
|
/*
|
|
* 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, 0))
|
|
return;
|
|
|
|
/* greedy RSVP, snatches any PATH packet of the RSVP protocol and no
|
|
* matter if it is destined to another node, or whether it is
|
|
* a multicast one, RSVP wants it! and prevents it from being forwarded
|
|
* anywhere else. Also checks if the rsvp daemon is running before
|
|
* grabbing the packet.
|
|
*/
|
|
if (ip->ip_p == IPPROTO_RSVP && V_rsvp_on)
|
|
goto ours;
|
|
|
|
/*
|
|
* Check our list of addresses, to see if the packet is for us.
|
|
* If we don't have any addresses, assume any unicast packet
|
|
* we receive might be for us (and let the upper layers deal
|
|
* with it).
|
|
*/
|
|
if (CK_STAILQ_EMPTY(&V_in_ifaddrhead) &&
|
|
(m->m_flags & (M_MCAST|M_BCAST)) == 0)
|
|
goto ours;
|
|
|
|
/*
|
|
* Enable a consistency check between the destination address
|
|
* and the arrival interface for a unicast packet (the RFC 1122
|
|
* strong ES model) with a list of additional predicates:
|
|
* - if IP forwarding is disabled
|
|
* - the packet is not locally generated
|
|
* - the packet is not subject to 'ipfw fwd'
|
|
* - Interface is not running CARP. If the packet got here, we already
|
|
* checked it with carp_iamatch() and carp_forus().
|
|
*/
|
|
strong_es = V_ip_strong_es && (V_ipforwarding == 0) &&
|
|
((ifp->if_flags & IFF_LOOPBACK) == 0) &&
|
|
ifp->if_carp == NULL && (dchg == 0);
|
|
|
|
/*
|
|
* Check for exact addresses in the hash bucket.
|
|
*/
|
|
CK_LIST_FOREACH(ia, INADDR_HASH(ip->ip_dst.s_addr), ia_hash) {
|
|
if (IA_SIN(ia)->sin_addr.s_addr != ip->ip_dst.s_addr)
|
|
continue;
|
|
|
|
/*
|
|
* net.inet.ip.rfc1122_strong_es: the address matches, verify
|
|
* that the packet arrived via the correct interface.
|
|
*/
|
|
if (__predict_false(strong_es && ia->ia_ifp != ifp)) {
|
|
IPSTAT_INC(ips_badaddr);
|
|
goto bad;
|
|
}
|
|
|
|
/*
|
|
* net.inet.ip.source_address_validation: drop incoming
|
|
* packets that pretend to be ours.
|
|
*/
|
|
if (V_ip_sav && !(ifp->if_flags & IFF_LOOPBACK) &&
|
|
__predict_false(in_localip_fib(ip->ip_src, ifp->if_fib))) {
|
|
IPSTAT_INC(ips_badaddr);
|
|
goto bad;
|
|
}
|
|
|
|
counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
|
|
counter_u64_add(ia->ia_ifa.ifa_ibytes, m->m_pkthdr.len);
|
|
goto ours;
|
|
}
|
|
|
|
/*
|
|
* Check for broadcast addresses.
|
|
*
|
|
* Only accept broadcast packets that arrive via the matching
|
|
* interface. Reception of forwarded directed broadcasts would
|
|
* be handled via ip_forward() and ether_output() with the loopback
|
|
* into the stack for SIMPLEX interfaces handled by ether_output().
|
|
*/
|
|
if (ifp->if_flags & IFF_BROADCAST) {
|
|
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
|
|
if (ifa->ifa_addr->sa_family != AF_INET)
|
|
continue;
|
|
ia = ifatoia(ifa);
|
|
if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr ==
|
|
ip->ip_dst.s_addr) {
|
|
counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
|
|
counter_u64_add(ia->ia_ifa.ifa_ibytes,
|
|
m->m_pkthdr.len);
|
|
goto ours;
|
|
}
|
|
#ifdef BOOTP_COMPAT
|
|
if (IA_SIN(ia)->sin_addr.s_addr == INADDR_ANY) {
|
|
counter_u64_add(ia->ia_ifa.ifa_ipackets, 1);
|
|
counter_u64_add(ia->ia_ifa.ifa_ibytes,
|
|
m->m_pkthdr.len);
|
|
goto ours;
|
|
}
|
|
#endif
|
|
}
|
|
ia = NULL;
|
|
}
|
|
if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr))) {
|
|
/*
|
|
* RFC 3927 2.7: Do not forward multicast packets from
|
|
* IN_LINKLOCAL.
|
|
*/
|
|
if (V_ip_mrouter && !IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) {
|
|
/*
|
|
* 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.
|
|
*/
|
|
if (ip_mforward && ip_mforward(ip, ifp, m, 0) != 0) {
|
|
IPSTAT_INC(ips_cantforward);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* The process-level routing daemon 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;
|
|
}
|
|
IPSTAT_INC(ips_forward);
|
|
}
|
|
/*
|
|
* Assume the packet is for us, to avoid prematurely taking
|
|
* a lock on the in_multi hash. Protocols must perform
|
|
* their own filtering and update statistics accordingly.
|
|
*/
|
|
goto ours;
|
|
}
|
|
if (ip->ip_dst.s_addr == (u_long)INADDR_BROADCAST)
|
|
goto ours;
|
|
if (ip->ip_dst.s_addr == INADDR_ANY)
|
|
goto ours;
|
|
/* RFC 3927 2.7: Do not forward packets to or from IN_LINKLOCAL. */
|
|
if (IN_LINKLOCAL(ntohl(ip->ip_dst.s_addr)) ||
|
|
IN_LINKLOCAL(ntohl(ip->ip_src.s_addr))) {
|
|
IPSTAT_INC(ips_cantforward);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Not for us; forward if possible and desirable.
|
|
*/
|
|
if (V_ipforwarding == 0) {
|
|
IPSTAT_INC(ips_cantforward);
|
|
m_freem(m);
|
|
} else {
|
|
ip_forward(m, dchg);
|
|
}
|
|
return;
|
|
|
|
ours:
|
|
#ifdef IPSTEALTH
|
|
/*
|
|
* IPSTEALTH: Process non-routing options only
|
|
* if the packet is destined for us.
|
|
*/
|
|
if (V_ipstealth && hlen > sizeof (struct ip) && ip_dooptions(m, 1))
|
|
return;
|
|
#endif /* IPSTEALTH */
|
|
|
|
/*
|
|
* Attempt reassembly; if it succeeds, proceed.
|
|
* ip_reass() will return a different mbuf.
|
|
*/
|
|
if (ip->ip_off & htons(IP_MF | IP_OFFMASK)) {
|
|
/* XXXGL: shouldn't we save & set m_flags? */
|
|
m = ip_reass(m);
|
|
if (m == NULL)
|
|
return;
|
|
ip = mtod(m, struct ip *);
|
|
/* Get the header length of the reassembled packet */
|
|
hlen = ip->ip_hl << 2;
|
|
}
|
|
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
if (IPSEC_ENABLED(ipv4)) {
|
|
if (IPSEC_INPUT(ipv4, m, hlen, ip->ip_p) != 0)
|
|
return;
|
|
}
|
|
#endif /* IPSEC */
|
|
|
|
/*
|
|
* Switch out to protocol's input routine.
|
|
*/
|
|
IPSTAT_INC(ips_delivered);
|
|
|
|
ip_protox[ip->ip_p](&m, &hlen, ip->ip_p);
|
|
return;
|
|
bad:
|
|
m_freem(m);
|
|
}
|
|
|
|
int
|
|
ipproto_register(uint8_t proto, ipproto_input_t input, ipproto_ctlinput_t ctl)
|
|
{
|
|
|
|
MPASS(proto > 0);
|
|
|
|
/*
|
|
* The protocol slot must not be occupied by another protocol
|
|
* already. An index pointing to rip_input() is unused.
|
|
*/
|
|
if (ip_protox[proto] == rip_input) {
|
|
ip_protox[proto] = input;
|
|
ip_ctlprotox[proto] = ctl;
|
|
return (0);
|
|
} else
|
|
return (EEXIST);
|
|
}
|
|
|
|
int
|
|
ipproto_unregister(uint8_t proto)
|
|
{
|
|
|
|
MPASS(proto > 0);
|
|
|
|
if (ip_protox[proto] != rip_input) {
|
|
ip_protox[proto] = rip_input;
|
|
ip_ctlprotox[proto] = rip_ctlinput;
|
|
return (0);
|
|
} else
|
|
return (ENOENT);
|
|
}
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
void
|
|
ip_forward(struct mbuf *m, int srcrt)
|
|
{
|
|
struct ip *ip = mtod(m, struct ip *);
|
|
struct in_ifaddr *ia;
|
|
struct mbuf *mcopy;
|
|
struct sockaddr_in *sin;
|
|
struct in_addr dest;
|
|
struct route ro;
|
|
uint32_t flowid;
|
|
int error, type = 0, code = 0, mtu = 0;
|
|
|
|
NET_EPOCH_ASSERT();
|
|
|
|
if (m->m_flags & (M_BCAST|M_MCAST) || in_canforward(ip->ip_dst) == 0) {
|
|
IPSTAT_INC(ips_cantforward);
|
|
m_freem(m);
|
|
return;
|
|
}
|
|
if (
|
|
#ifdef IPSTEALTH
|
|
V_ipstealth == 0 &&
|
|
#endif
|
|
ip->ip_ttl <= IPTTLDEC) {
|
|
icmp_error(m, ICMP_TIMXCEED, ICMP_TIMXCEED_INTRANS, 0, 0);
|
|
return;
|
|
}
|
|
|
|
bzero(&ro, sizeof(ro));
|
|
sin = (struct sockaddr_in *)&ro.ro_dst;
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_len = sizeof(*sin);
|
|
sin->sin_addr = ip->ip_dst;
|
|
flowid = m->m_pkthdr.flowid;
|
|
ro.ro_nh = fib4_lookup(M_GETFIB(m), ip->ip_dst, 0, NHR_REF, flowid);
|
|
if (ro.ro_nh != NULL) {
|
|
ia = ifatoia(ro.ro_nh->nh_ifa);
|
|
} else
|
|
ia = NULL;
|
|
/*
|
|
* Save the IP header and at most 8 bytes of the payload,
|
|
* in case we need to generate an ICMP message to the src.
|
|
*
|
|
* XXX this can be optimized a lot by saving the data in a local
|
|
* buffer on the stack (72 bytes at most), and only allocating the
|
|
* mbuf if really necessary. The vast majority of the packets
|
|
* are forwarded without having to send an ICMP back (either
|
|
* because unnecessary, or because rate limited), so we are
|
|
* really we are wasting a lot of work here.
|
|
*
|
|
* We don't use m_copym() because it might return a reference
|
|
* to a shared cluster. Both this function and ip_output()
|
|
* assume exclusive access to the IP header in `m', so any
|
|
* data in a cluster may change before we reach icmp_error().
|
|
*/
|
|
mcopy = m_gethdr(M_NOWAIT, m->m_type);
|
|
if (mcopy != NULL && !m_dup_pkthdr(mcopy, m, M_NOWAIT)) {
|
|
/*
|
|
* It's probably ok if the pkthdr dup fails (because
|
|
* the deep copy of the tag chain failed), but for now
|
|
* be conservative and just discard the copy since
|
|
* code below may some day want the tags.
|
|
*/
|
|
m_free(mcopy);
|
|
mcopy = NULL;
|
|
}
|
|
if (mcopy != NULL) {
|
|
mcopy->m_len = min(ntohs(ip->ip_len), M_TRAILINGSPACE(mcopy));
|
|
mcopy->m_pkthdr.len = mcopy->m_len;
|
|
m_copydata(m, 0, mcopy->m_len, mtod(mcopy, caddr_t));
|
|
}
|
|
#ifdef IPSTEALTH
|
|
if (V_ipstealth == 0)
|
|
#endif
|
|
ip->ip_ttl -= IPTTLDEC;
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
if (IPSEC_ENABLED(ipv4)) {
|
|
if ((error = IPSEC_FORWARD(ipv4, m)) != 0) {
|
|
/* mbuf consumed by IPsec */
|
|
RO_NHFREE(&ro);
|
|
m_freem(mcopy);
|
|
if (error != EINPROGRESS)
|
|
IPSTAT_INC(ips_cantforward);
|
|
return;
|
|
}
|
|
/* No IPsec processing required */
|
|
}
|
|
#endif /* IPSEC */
|
|
/*
|
|
* 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.
|
|
*/
|
|
dest.s_addr = 0;
|
|
if (!srcrt && V_ipsendredirects &&
|
|
ia != NULL && ia->ia_ifp == m->m_pkthdr.rcvif) {
|
|
struct nhop_object *nh;
|
|
|
|
nh = ro.ro_nh;
|
|
|
|
if (nh != NULL && ((nh->nh_flags & (NHF_REDIRECT|NHF_DEFAULT)) == 0)) {
|
|
struct in_ifaddr *nh_ia = (struct in_ifaddr *)(nh->nh_ifa);
|
|
u_long src = ntohl(ip->ip_src.s_addr);
|
|
|
|
if (nh_ia != NULL &&
|
|
(src & nh_ia->ia_subnetmask) == nh_ia->ia_subnet) {
|
|
/* Router requirements says to only send host redirects */
|
|
type = ICMP_REDIRECT;
|
|
code = ICMP_REDIRECT_HOST;
|
|
if (nh->nh_flags & NHF_GATEWAY) {
|
|
if (nh->gw_sa.sa_family == AF_INET)
|
|
dest.s_addr = nh->gw4_sa.sin_addr.s_addr;
|
|
else /* Do not redirect in case gw is AF_INET6 */
|
|
type = 0;
|
|
} else
|
|
dest.s_addr = ip->ip_dst.s_addr;
|
|
}
|
|
}
|
|
}
|
|
|
|
error = ip_output(m, NULL, &ro, IP_FORWARDING, NULL, NULL);
|
|
|
|
if (error == EMSGSIZE && ro.ro_nh)
|
|
mtu = ro.ro_nh->nh_mtu;
|
|
RO_NHFREE(&ro);
|
|
|
|
if (error)
|
|
IPSTAT_INC(ips_cantforward);
|
|
else {
|
|
IPSTAT_INC(ips_forward);
|
|
if (type)
|
|
IPSTAT_INC(ips_redirectsent);
|
|
else {
|
|
if (mcopy)
|
|
m_freem(mcopy);
|
|
return;
|
|
}
|
|
}
|
|
if (mcopy == NULL)
|
|
return;
|
|
|
|
switch (error) {
|
|
case 0: /* forwarded, but need redirect */
|
|
/* type, code set above */
|
|
break;
|
|
|
|
case ENETUNREACH:
|
|
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 the MTU was set before make sure we are below the
|
|
* interface MTU.
|
|
* If the MTU wasn't set before use the interface mtu or
|
|
* fall back to the next smaller mtu step compared to the
|
|
* current packet size.
|
|
*/
|
|
if (mtu != 0) {
|
|
if (ia != NULL)
|
|
mtu = min(mtu, ia->ia_ifp->if_mtu);
|
|
} else {
|
|
if (ia != NULL)
|
|
mtu = ia->ia_ifp->if_mtu;
|
|
else
|
|
mtu = ip_next_mtu(ntohs(ip->ip_len), 0);
|
|
}
|
|
IPSTAT_INC(ips_cantfrag);
|
|
break;
|
|
|
|
case ENOBUFS:
|
|
case EACCES: /* ipfw denied packet */
|
|
m_freem(mcopy);
|
|
return;
|
|
}
|
|
icmp_error(mcopy, type, code, dest.s_addr, mtu);
|
|
}
|
|
|
|
#define CHECK_SO_CT(sp, ct) \
|
|
(((sp->so_options & SO_TIMESTAMP) && (sp->so_ts_clock == ct)) ? 1 : 0)
|
|
|
|
void
|
|
ip_savecontrol(struct inpcb *inp, struct mbuf **mp, struct ip *ip,
|
|
struct mbuf *m)
|
|
{
|
|
bool stamped;
|
|
|
|
stamped = false;
|
|
if ((inp->inp_socket->so_options & SO_BINTIME) ||
|
|
CHECK_SO_CT(inp->inp_socket, SO_TS_BINTIME)) {
|
|
struct bintime boottimebin, bt;
|
|
struct timespec ts1;
|
|
|
|
if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
|
|
M_TSTMP)) {
|
|
mbuf_tstmp2timespec(m, &ts1);
|
|
timespec2bintime(&ts1, &bt);
|
|
getboottimebin(&boottimebin);
|
|
bintime_add(&bt, &boottimebin);
|
|
} else {
|
|
bintime(&bt);
|
|
}
|
|
*mp = sbcreatecontrol(&bt, sizeof(bt), SCM_BINTIME,
|
|
SOL_SOCKET, M_NOWAIT);
|
|
if (*mp != NULL) {
|
|
mp = &(*mp)->m_next;
|
|
stamped = true;
|
|
}
|
|
}
|
|
if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME_MICRO)) {
|
|
struct bintime boottimebin, bt1;
|
|
struct timespec ts1;
|
|
struct timeval tv;
|
|
|
|
if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
|
|
M_TSTMP)) {
|
|
mbuf_tstmp2timespec(m, &ts1);
|
|
timespec2bintime(&ts1, &bt1);
|
|
getboottimebin(&boottimebin);
|
|
bintime_add(&bt1, &boottimebin);
|
|
bintime2timeval(&bt1, &tv);
|
|
} else {
|
|
microtime(&tv);
|
|
}
|
|
*mp = sbcreatecontrol((caddr_t)&tv, sizeof(tv), SCM_TIMESTAMP,
|
|
SOL_SOCKET, M_NOWAIT);
|
|
if (*mp != NULL) {
|
|
mp = &(*mp)->m_next;
|
|
stamped = true;
|
|
}
|
|
} else if (CHECK_SO_CT(inp->inp_socket, SO_TS_REALTIME)) {
|
|
struct bintime boottimebin;
|
|
struct timespec ts, ts1;
|
|
|
|
if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
|
|
M_TSTMP)) {
|
|
mbuf_tstmp2timespec(m, &ts);
|
|
getboottimebin(&boottimebin);
|
|
bintime2timespec(&boottimebin, &ts1);
|
|
timespecadd(&ts, &ts1, &ts);
|
|
} else {
|
|
nanotime(&ts);
|
|
}
|
|
*mp = sbcreatecontrol(&ts, sizeof(ts), SCM_REALTIME,
|
|
SOL_SOCKET, M_NOWAIT);
|
|
if (*mp != NULL) {
|
|
mp = &(*mp)->m_next;
|
|
stamped = true;
|
|
}
|
|
} else if (CHECK_SO_CT(inp->inp_socket, SO_TS_MONOTONIC)) {
|
|
struct timespec ts;
|
|
|
|
if ((m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
|
|
M_TSTMP))
|
|
mbuf_tstmp2timespec(m, &ts);
|
|
else
|
|
nanouptime(&ts);
|
|
*mp = sbcreatecontrol(&ts, sizeof(ts), SCM_MONOTONIC,
|
|
SOL_SOCKET, M_NOWAIT);
|
|
if (*mp != NULL) {
|
|
mp = &(*mp)->m_next;
|
|
stamped = true;
|
|
}
|
|
}
|
|
if (stamped && (m->m_flags & (M_PKTHDR | M_TSTMP)) == (M_PKTHDR |
|
|
M_TSTMP)) {
|
|
struct sock_timestamp_info sti;
|
|
|
|
bzero(&sti, sizeof(sti));
|
|
sti.st_info_flags = ST_INFO_HW;
|
|
if ((m->m_flags & M_TSTMP_HPREC) != 0)
|
|
sti.st_info_flags |= ST_INFO_HW_HPREC;
|
|
*mp = sbcreatecontrol(&sti, sizeof(sti), SCM_TIME_INFO,
|
|
SOL_SOCKET, M_NOWAIT);
|
|
if (*mp != NULL)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
if (inp->inp_flags & INP_RECVDSTADDR) {
|
|
*mp = sbcreatecontrol(&ip->ip_dst, sizeof(struct in_addr),
|
|
IP_RECVDSTADDR, IPPROTO_IP, M_NOWAIT);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
if (inp->inp_flags & INP_RECVTTL) {
|
|
*mp = sbcreatecontrol(&ip->ip_ttl, sizeof(u_char), IP_RECVTTL,
|
|
IPPROTO_IP, M_NOWAIT);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
#ifdef notyet
|
|
/* XXX
|
|
* Moving these out of udp_input() made them even more broken
|
|
* than they already were.
|
|
*/
|
|
/* options were tossed already */
|
|
if (inp->inp_flags & INP_RECVOPTS) {
|
|
*mp = sbcreatecontrol(opts_deleted_above,
|
|
sizeof(struct in_addr), IP_RECVOPTS, IPPROTO_IP, M_NOWAIT);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
/* ip_srcroute doesn't do what we want here, need to fix */
|
|
if (inp->inp_flags & INP_RECVRETOPTS) {
|
|
*mp = sbcreatecontrol(ip_srcroute(m), sizeof(struct in_addr),
|
|
IP_RECVRETOPTS, IPPROTO_IP, M_NOWAIT);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
#endif
|
|
if (inp->inp_flags & INP_RECVIF) {
|
|
struct ifnet *ifp;
|
|
struct sdlbuf {
|
|
struct sockaddr_dl sdl;
|
|
u_char pad[32];
|
|
} sdlbuf;
|
|
struct sockaddr_dl *sdp;
|
|
struct sockaddr_dl *sdl2 = &sdlbuf.sdl;
|
|
|
|
if ((ifp = m->m_pkthdr.rcvif)) {
|
|
sdp = (struct sockaddr_dl *)ifp->if_addr->ifa_addr;
|
|
/*
|
|
* Change our mind and don't try copy.
|
|
*/
|
|
if (sdp->sdl_family != AF_LINK ||
|
|
sdp->sdl_len > sizeof(sdlbuf)) {
|
|
goto makedummy;
|
|
}
|
|
bcopy(sdp, sdl2, sdp->sdl_len);
|
|
} else {
|
|
makedummy:
|
|
sdl2->sdl_len =
|
|
offsetof(struct sockaddr_dl, sdl_data[0]);
|
|
sdl2->sdl_family = AF_LINK;
|
|
sdl2->sdl_index = 0;
|
|
sdl2->sdl_nlen = sdl2->sdl_alen = sdl2->sdl_slen = 0;
|
|
}
|
|
*mp = sbcreatecontrol(sdl2, sdl2->sdl_len, IP_RECVIF,
|
|
IPPROTO_IP, M_NOWAIT);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
if (inp->inp_flags & INP_RECVTOS) {
|
|
*mp = sbcreatecontrol(&ip->ip_tos, sizeof(u_char), IP_RECVTOS,
|
|
IPPROTO_IP, M_NOWAIT);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
|
|
if (inp->inp_flags2 & INP_RECVFLOWID) {
|
|
uint32_t flowid, flow_type;
|
|
|
|
flowid = m->m_pkthdr.flowid;
|
|
flow_type = M_HASHTYPE_GET(m);
|
|
|
|
/*
|
|
* XXX should handle the failure of one or the
|
|
* other - don't populate both?
|
|
*/
|
|
*mp = sbcreatecontrol(&flowid, sizeof(uint32_t), IP_FLOWID,
|
|
IPPROTO_IP, M_NOWAIT);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
*mp = sbcreatecontrol(&flow_type, sizeof(uint32_t),
|
|
IP_FLOWTYPE, IPPROTO_IP, M_NOWAIT);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
|
|
#ifdef RSS
|
|
if (inp->inp_flags2 & INP_RECVRSSBUCKETID) {
|
|
uint32_t flowid, flow_type;
|
|
uint32_t rss_bucketid;
|
|
|
|
flowid = m->m_pkthdr.flowid;
|
|
flow_type = M_HASHTYPE_GET(m);
|
|
|
|
if (rss_hash2bucket(flowid, flow_type, &rss_bucketid) == 0) {
|
|
*mp = sbcreatecontrol(&rss_bucketid, sizeof(uint32_t),
|
|
IP_RSSBUCKETID, IPPROTO_IP, M_NOWAIT);
|
|
if (*mp)
|
|
mp = &(*mp)->m_next;
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* XXXRW: Multicast routing code in ip_mroute.c is generally MPSAFE, but the
|
|
* ip_rsvp and ip_rsvp_on variables need to be interlocked with rsvp_on
|
|
* locking. This code remains in ip_input.c as ip_mroute.c is optionally
|
|
* compiled.
|
|
*/
|
|
VNET_DEFINE_STATIC(int, ip_rsvp_on);
|
|
VNET_DEFINE(struct socket *, ip_rsvpd);
|
|
|
|
#define V_ip_rsvp_on VNET(ip_rsvp_on)
|
|
|
|
int
|
|
ip_rsvp_init(struct socket *so)
|
|
{
|
|
|
|
if (V_ip_rsvpd != NULL)
|
|
return EADDRINUSE;
|
|
|
|
V_ip_rsvpd = so;
|
|
/*
|
|
* This may seem silly, but we need to be sure we don't over-increment
|
|
* the RSVP counter, in case something slips up.
|
|
*/
|
|
if (!V_ip_rsvp_on) {
|
|
V_ip_rsvp_on = 1;
|
|
V_rsvp_on++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
ip_rsvp_done(void)
|
|
{
|
|
|
|
V_ip_rsvpd = NULL;
|
|
/*
|
|
* This may seem silly, but we need to be sure we don't over-decrement
|
|
* the RSVP counter, in case something slips up.
|
|
*/
|
|
if (V_ip_rsvp_on) {
|
|
V_ip_rsvp_on = 0;
|
|
V_rsvp_on--;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
rsvp_input(struct mbuf **mp, int *offp, int proto)
|
|
{
|
|
struct mbuf *m;
|
|
|
|
m = *mp;
|
|
*mp = NULL;
|
|
|
|
if (rsvp_input_p) { /* call the real one if loaded */
|
|
*mp = m;
|
|
rsvp_input_p(mp, offp, proto);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
/* Can still get packets with rsvp_on = 0 if there is a local member
|
|
* of the group to which the RSVP packet is addressed. But in this
|
|
* case we want to throw the packet away.
|
|
*/
|
|
|
|
if (!V_rsvp_on) {
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
if (V_ip_rsvpd != NULL) {
|
|
*mp = m;
|
|
rip_input(mp, offp, proto);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
/* Drop the packet */
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|