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
1093 lines
26 KiB
C
1093 lines
26 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.
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* 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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* @(#)raw_ip.c 8.7 (Berkeley) 5/15/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_ipsec.h"
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#include "opt_route.h"
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#include <sys/param.h>
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#include <sys/jail.h>
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#include <sys/kernel.h>
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#include <sys/eventhandler.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/rwlock.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sx.h>
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#include <sys/sysctl.h>
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#include <sys/systm.h>
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#include <vm/uma.h>
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#include <net/if.h>
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#include <net/if_var.h>
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#include <net/route.h>
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#include <net/route/route_ctl.h>
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#include <net/vnet.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.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/in_var.h>
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#include <netinet/if_ether.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_mroute.h>
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#include <netinet/ip_icmp.h>
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#include <netipsec/ipsec_support.h>
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#include <machine/stdarg.h>
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#include <security/mac/mac_framework.h>
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extern ipproto_input_t *ip_protox[];
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VNET_DEFINE(int, ip_defttl) = IPDEFTTL;
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SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_VNET | CTLFLAG_RW,
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&VNET_NAME(ip_defttl), 0,
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"Maximum TTL on IP packets");
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VNET_DEFINE(struct inpcbinfo, ripcbinfo);
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#define V_ripcbinfo VNET(ripcbinfo)
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/*
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* Control and data hooks for ipfw, dummynet, divert and so on.
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* The data hooks are not used here but it is convenient
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* to keep them all in one place.
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*/
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VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL;
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VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL;
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int (*ip_dn_ctl_ptr)(struct sockopt *);
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int (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *);
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void (*ip_divert_ptr)(struct mbuf *, bool);
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int (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool);
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#ifdef INET
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/*
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* Hooks for multicast routing. They all default to NULL, so leave them not
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* initialized and rely on BSS being set to 0.
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*/
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/*
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* The socket used to communicate with the multicast routing daemon.
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*/
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VNET_DEFINE(struct socket *, ip_mrouter);
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/*
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* The various mrouter and rsvp functions.
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*/
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int (*ip_mrouter_set)(struct socket *, struct sockopt *);
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int (*ip_mrouter_get)(struct socket *, struct sockopt *);
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int (*ip_mrouter_done)(void);
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int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
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struct ip_moptions *);
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int (*mrt_ioctl)(u_long, caddr_t, int);
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int (*legal_vif_num)(int);
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u_long (*ip_mcast_src)(int);
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int (*rsvp_input_p)(struct mbuf **, int *, int);
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int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
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void (*ip_rsvp_force_done)(struct socket *);
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#endif /* INET */
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u_long rip_sendspace = 9216;
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SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
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&rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
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u_long rip_recvspace = 9216;
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SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
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&rip_recvspace, 0, "Maximum space for incoming raw IP datagrams");
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/*
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* Hash functions
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*/
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#define INP_PCBHASH_RAW_SIZE 256
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#define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \
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(((proto) + (laddr) + (faddr)) % (mask) + 1)
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#ifdef INET
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static void
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rip_inshash(struct inpcb *inp)
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{
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struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
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struct inpcbhead *pcbhash;
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int hash;
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INP_HASH_WLOCK_ASSERT(pcbinfo);
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INP_WLOCK_ASSERT(inp);
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if (inp->inp_ip_p != 0 &&
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inp->inp_laddr.s_addr != INADDR_ANY &&
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inp->inp_faddr.s_addr != INADDR_ANY) {
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hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr,
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inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask);
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} else
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hash = 0;
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pcbhash = &pcbinfo->ipi_hashbase[hash];
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CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
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}
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static void
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rip_delhash(struct inpcb *inp)
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{
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INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
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INP_WLOCK_ASSERT(inp);
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CK_LIST_REMOVE(inp, inp_hash);
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}
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#endif /* INET */
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INPCBSTORAGE_DEFINE(ripcbstor, "rawinp", "ripcb", "rip", "riphash");
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static void
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rip_init(void *arg __unused)
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{
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in_pcbinfo_init(&V_ripcbinfo, &ripcbstor, INP_PCBHASH_RAW_SIZE, 1);
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}
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VNET_SYSINIT(rip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rip_init, NULL);
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#ifdef VIMAGE
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static void
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rip_destroy(void *unused __unused)
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{
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in_pcbinfo_destroy(&V_ripcbinfo);
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}
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VNET_SYSUNINIT(raw_ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, rip_destroy, NULL);
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#endif
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#ifdef INET
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static int
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rip_append(struct inpcb *inp, struct ip *ip, struct mbuf *m,
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struct sockaddr_in *ripsrc)
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{
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struct socket *so = inp->inp_socket;
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struct mbuf *n, *opts = NULL;
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INP_LOCK_ASSERT(inp);
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#if defined(IPSEC) || defined(IPSEC_SUPPORT)
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/* check AH/ESP integrity. */
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if (IPSEC_ENABLED(ipv4) && IPSEC_CHECK_POLICY(ipv4, m, inp) != 0)
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return (0);
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#endif /* IPSEC */
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#ifdef MAC
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if (mac_inpcb_check_deliver(inp, m) != 0)
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return (0);
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#endif
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/* Check the minimum TTL for socket. */
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if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl)
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return (0);
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if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL)
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return (0);
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if ((inp->inp_flags & INP_CONTROLOPTS) ||
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(so->so_options & (SO_TIMESTAMP | SO_BINTIME)))
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ip_savecontrol(inp, &opts, ip, n);
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SOCKBUF_LOCK(&so->so_rcv);
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if (sbappendaddr_locked(&so->so_rcv,
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(struct sockaddr *)ripsrc, n, opts) == 0) {
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soroverflow_locked(so);
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m_freem(n);
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if (opts)
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m_freem(opts);
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return (0);
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}
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sorwakeup_locked(so);
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return (1);
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}
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struct rip_inp_match_ctx {
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struct ip *ip;
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int proto;
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};
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static bool
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rip_inp_match1(const struct inpcb *inp, void *v)
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{
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struct rip_inp_match_ctx *ctx = v;
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if (inp->inp_ip_p != ctx->proto)
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return (false);
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#ifdef INET6
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/* XXX inp locking */
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if ((inp->inp_vflag & INP_IPV4) == 0)
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return (false);
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#endif
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if (inp->inp_laddr.s_addr != ctx->ip->ip_dst.s_addr)
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return (false);
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if (inp->inp_faddr.s_addr != ctx->ip->ip_src.s_addr)
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return (false);
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return (true);
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}
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static bool
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rip_inp_match2(const struct inpcb *inp, void *v)
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{
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struct rip_inp_match_ctx *ctx = v;
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if (inp->inp_ip_p && inp->inp_ip_p != ctx->proto)
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return (false);
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#ifdef INET6
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/* XXX inp locking */
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if ((inp->inp_vflag & INP_IPV4) == 0)
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return (false);
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#endif
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if (!in_nullhost(inp->inp_laddr) &&
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!in_hosteq(inp->inp_laddr, ctx->ip->ip_dst))
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return (false);
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if (!in_nullhost(inp->inp_faddr) &&
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!in_hosteq(inp->inp_faddr, ctx->ip->ip_src))
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return (false);
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return (true);
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}
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|
|
/*
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* Setup generic address and protocol structures for raw_input routine, then
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* pass them along with mbuf chain.
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*/
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int
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rip_input(struct mbuf **mp, int *offp, int proto)
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{
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struct rip_inp_match_ctx ctx = {
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.ip = mtod(*mp, struct ip *),
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.proto = proto,
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};
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struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo,
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INPLOOKUP_RLOCKPCB, rip_inp_match1, &ctx);
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struct ifnet *ifp;
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struct mbuf *m = *mp;
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struct inpcb *inp;
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struct sockaddr_in ripsrc;
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int appended;
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*mp = NULL;
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appended = 0;
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bzero(&ripsrc, sizeof(ripsrc));
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ripsrc.sin_len = sizeof(ripsrc);
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ripsrc.sin_family = AF_INET;
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ripsrc.sin_addr = ctx.ip->ip_src;
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ifp = m->m_pkthdr.rcvif;
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inpi.hash = INP_PCBHASH_RAW(proto, ctx.ip->ip_src.s_addr,
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ctx.ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask);
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while ((inp = inp_next(&inpi)) != NULL) {
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INP_RLOCK_ASSERT(inp);
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if (jailed_without_vnet(inp->inp_cred) &&
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prison_check_ip4(inp->inp_cred, &ctx.ip->ip_dst) != 0) {
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/*
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* XXX: If faddr was bound to multicast group,
|
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* jailed raw socket will drop datagram.
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*/
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continue;
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}
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appended += rip_append(inp, ctx.ip, m, &ripsrc);
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}
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inpi.hash = 0;
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inpi.match = rip_inp_match2;
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MPASS(inpi.inp == NULL);
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while ((inp = inp_next(&inpi)) != NULL) {
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INP_RLOCK_ASSERT(inp);
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if (jailed_without_vnet(inp->inp_cred) &&
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!IN_MULTICAST(ntohl(ctx.ip->ip_dst.s_addr)) &&
|
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prison_check_ip4(inp->inp_cred, &ctx.ip->ip_dst) != 0)
|
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/*
|
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* Allow raw socket in jail to receive multicast;
|
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* assume process had PRIV_NETINET_RAW at attach,
|
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* and fall through into normal filter path if so.
|
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*/
|
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continue;
|
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/*
|
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* If this raw socket has multicast state, and we
|
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* have received a multicast, check if this socket
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* should receive it, as multicast filtering is now
|
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* the responsibility of the transport layer.
|
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*/
|
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if (inp->inp_moptions != NULL &&
|
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IN_MULTICAST(ntohl(ctx.ip->ip_dst.s_addr))) {
|
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/*
|
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* If the incoming datagram is for IGMP, allow it
|
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* through unconditionally to the raw socket.
|
|
*
|
|
* In the case of IGMPv2, we may not have explicitly
|
|
* joined the group, and may have set IFF_ALLMULTI
|
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* on the interface. imo_multi_filter() may discard
|
|
* control traffic we actually need to see.
|
|
*
|
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* Userland multicast routing daemons should continue
|
|
* filter the control traffic appropriately.
|
|
*/
|
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int blocked;
|
|
|
|
blocked = MCAST_PASS;
|
|
if (proto != IPPROTO_IGMP) {
|
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struct sockaddr_in group;
|
|
|
|
bzero(&group, sizeof(struct sockaddr_in));
|
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group.sin_len = sizeof(struct sockaddr_in);
|
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group.sin_family = AF_INET;
|
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group.sin_addr = ctx.ip->ip_dst;
|
|
|
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blocked = imo_multi_filter(inp->inp_moptions,
|
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ifp,
|
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(struct sockaddr *)&group,
|
|
(struct sockaddr *)&ripsrc);
|
|
}
|
|
|
|
if (blocked != MCAST_PASS) {
|
|
IPSTAT_INC(ips_notmember);
|
|
continue;
|
|
}
|
|
}
|
|
appended += rip_append(inp, ctx.ip, m, &ripsrc);
|
|
}
|
|
if (appended == 0 && ip_protox[ctx.ip->ip_p] == rip_input) {
|
|
IPSTAT_INC(ips_noproto);
|
|
IPSTAT_DEC(ips_delivered);
|
|
icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PROTOCOL, 0, 0);
|
|
} else
|
|
m_freem(m);
|
|
return (IPPROTO_DONE);
|
|
}
|
|
|
|
/*
|
|
* Generate IP header and pass packet to ip_output. Tack on options user may
|
|
* have setup with control call.
|
|
*/
|
|
static int
|
|
rip_send(struct socket *so, int pruflags, struct mbuf *m, struct sockaddr *nam,
|
|
struct mbuf *control, struct thread *td)
|
|
{
|
|
struct epoch_tracker et;
|
|
struct ip *ip;
|
|
struct inpcb *inp;
|
|
in_addr_t *dst;
|
|
int error, flags, cnt, hlen;
|
|
u_char opttype, optlen, *cp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("rip_send: inp == NULL"));
|
|
|
|
if (control != NULL) {
|
|
m_freem(control);
|
|
control = NULL;
|
|
}
|
|
|
|
if (so->so_state & SS_ISCONNECTED) {
|
|
if (nam) {
|
|
error = EISCONN;
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
dst = &inp->inp_faddr.s_addr;
|
|
} else {
|
|
if (nam == NULL)
|
|
error = ENOTCONN;
|
|
else if (nam->sa_family != AF_INET)
|
|
error = EAFNOSUPPORT;
|
|
else if (nam->sa_len != sizeof(struct sockaddr_in))
|
|
error = EINVAL;
|
|
else
|
|
error = 0;
|
|
if (error != 0) {
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
dst = &((struct sockaddr_in *)nam)->sin_addr.s_addr;
|
|
}
|
|
|
|
flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) |
|
|
IP_ALLOWBROADCAST;
|
|
|
|
/*
|
|
* If the user handed us a complete IP packet, use it. Otherwise,
|
|
* allocate an mbuf for a header and fill it in.
|
|
*/
|
|
if ((inp->inp_flags & INP_HDRINCL) == 0) {
|
|
if (m->m_pkthdr.len + sizeof(struct ip) > IP_MAXPACKET) {
|
|
m_freem(m);
|
|
return(EMSGSIZE);
|
|
}
|
|
M_PREPEND(m, sizeof(struct ip), M_NOWAIT);
|
|
if (m == NULL)
|
|
return(ENOBUFS);
|
|
|
|
INP_RLOCK(inp);
|
|
ip = mtod(m, struct ip *);
|
|
ip->ip_tos = inp->inp_ip_tos;
|
|
if (inp->inp_flags & INP_DONTFRAG)
|
|
ip->ip_off = htons(IP_DF);
|
|
else
|
|
ip->ip_off = htons(0);
|
|
ip->ip_p = inp->inp_ip_p;
|
|
ip->ip_len = htons(m->m_pkthdr.len);
|
|
ip->ip_src = inp->inp_laddr;
|
|
ip->ip_dst.s_addr = *dst;
|
|
#ifdef ROUTE_MPATH
|
|
if (CALC_FLOWID_OUTBOUND) {
|
|
uint32_t hash_type, hash_val;
|
|
|
|
hash_val = fib4_calc_software_hash(ip->ip_src,
|
|
ip->ip_dst, 0, 0, ip->ip_p, &hash_type);
|
|
m->m_pkthdr.flowid = hash_val;
|
|
M_HASHTYPE_SET(m, hash_type);
|
|
flags |= IP_NODEFAULTFLOWID;
|
|
}
|
|
#endif
|
|
if (jailed(inp->inp_cred)) {
|
|
/*
|
|
* prison_local_ip4() would be good enough but would
|
|
* let a source of INADDR_ANY pass, which we do not
|
|
* want to see from jails.
|
|
*/
|
|
if (ip->ip_src.s_addr == INADDR_ANY) {
|
|
NET_EPOCH_ENTER(et);
|
|
error = in_pcbladdr(inp, &ip->ip_dst,
|
|
&ip->ip_src, inp->inp_cred);
|
|
NET_EPOCH_EXIT(et);
|
|
} else {
|
|
error = prison_local_ip4(inp->inp_cred,
|
|
&ip->ip_src);
|
|
}
|
|
if (error != 0) {
|
|
INP_RUNLOCK(inp);
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
}
|
|
ip->ip_ttl = inp->inp_ip_ttl;
|
|
} else {
|
|
if (m->m_pkthdr.len > IP_MAXPACKET) {
|
|
m_freem(m);
|
|
return (EMSGSIZE);
|
|
}
|
|
if (m->m_pkthdr.len < sizeof(*ip)) {
|
|
m_freem(m);
|
|
return (EINVAL);
|
|
}
|
|
m = m_pullup(m, sizeof(*ip));
|
|
if (m == NULL)
|
|
return (ENOMEM);
|
|
ip = mtod(m, struct ip *);
|
|
hlen = ip->ip_hl << 2;
|
|
if (m->m_len < hlen) {
|
|
m = m_pullup(m, hlen);
|
|
if (m == NULL)
|
|
return (EINVAL);
|
|
ip = mtod(m, struct ip *);
|
|
}
|
|
#ifdef ROUTE_MPATH
|
|
if (CALC_FLOWID_OUTBOUND) {
|
|
uint32_t hash_type, hash_val;
|
|
|
|
hash_val = fib4_calc_software_hash(ip->ip_dst,
|
|
ip->ip_src, 0, 0, ip->ip_p, &hash_type);
|
|
m->m_pkthdr.flowid = hash_val;
|
|
M_HASHTYPE_SET(m, hash_type);
|
|
flags |= IP_NODEFAULTFLOWID;
|
|
}
|
|
#endif
|
|
INP_RLOCK(inp);
|
|
/*
|
|
* Don't allow both user specified and setsockopt options,
|
|
* and don't allow packet length sizes that will crash.
|
|
*/
|
|
if ((hlen < sizeof (*ip))
|
|
|| ((hlen > sizeof (*ip)) && inp->inp_options)
|
|
|| (ntohs(ip->ip_len) != m->m_pkthdr.len)) {
|
|
INP_RUNLOCK(inp);
|
|
m_freem(m);
|
|
return (EINVAL);
|
|
}
|
|
error = prison_check_ip4(inp->inp_cred, &ip->ip_src);
|
|
if (error != 0) {
|
|
INP_RUNLOCK(inp);
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
/*
|
|
* Don't allow IP options which do not have the required
|
|
* structure as specified in section 3.1 of RFC 791 on
|
|
* pages 15-23.
|
|
*/
|
|
cp = (u_char *)(ip + 1);
|
|
cnt = hlen - sizeof (struct ip);
|
|
for (; cnt > 0; cnt -= optlen, cp += optlen) {
|
|
opttype = cp[IPOPT_OPTVAL];
|
|
if (opttype == IPOPT_EOL)
|
|
break;
|
|
if (opttype == IPOPT_NOP) {
|
|
optlen = 1;
|
|
continue;
|
|
}
|
|
if (cnt < IPOPT_OLEN + sizeof(u_char)) {
|
|
INP_RUNLOCK(inp);
|
|
m_freem(m);
|
|
return (EINVAL);
|
|
}
|
|
optlen = cp[IPOPT_OLEN];
|
|
if (optlen < IPOPT_OLEN + sizeof(u_char) ||
|
|
optlen > cnt) {
|
|
INP_RUNLOCK(inp);
|
|
m_freem(m);
|
|
return (EINVAL);
|
|
}
|
|
}
|
|
/*
|
|
* This doesn't allow application to specify ID of zero,
|
|
* but we got this limitation from the beginning of history.
|
|
*/
|
|
if (ip->ip_id == 0)
|
|
ip_fillid(ip);
|
|
|
|
/*
|
|
* XXX prevent ip_output from overwriting header fields.
|
|
*/
|
|
flags |= IP_RAWOUTPUT;
|
|
IPSTAT_INC(ips_rawout);
|
|
}
|
|
|
|
if (inp->inp_flags & INP_ONESBCAST)
|
|
flags |= IP_SENDONES;
|
|
|
|
#ifdef MAC
|
|
mac_inpcb_create_mbuf(inp, m);
|
|
#endif
|
|
|
|
NET_EPOCH_ENTER(et);
|
|
error = ip_output(m, inp->inp_options, NULL, flags,
|
|
inp->inp_moptions, inp);
|
|
NET_EPOCH_EXIT(et);
|
|
INP_RUNLOCK(inp);
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* Raw IP socket option processing.
|
|
*
|
|
* IMPORTANT NOTE regarding access control: Traditionally, raw sockets could
|
|
* only be created by a privileged process, and as such, socket option
|
|
* operations to manage system properties on any raw socket were allowed to
|
|
* take place without explicit additional access control checks. However,
|
|
* raw sockets can now also be created in jail(), and therefore explicit
|
|
* checks are now required. Likewise, raw sockets can be used by a process
|
|
* after it gives up privilege, so some caution is required. For options
|
|
* passed down to the IP layer via ip_ctloutput(), checks are assumed to be
|
|
* performed in ip_ctloutput() and therefore no check occurs here.
|
|
* Unilaterally checking priv_check() here breaks normal IP socket option
|
|
* operations on raw sockets.
|
|
*
|
|
* When adding new socket options here, make sure to add access control
|
|
* checks here as necessary.
|
|
*
|
|
* XXX-BZ inp locking?
|
|
*/
|
|
int
|
|
rip_ctloutput(struct socket *so, struct sockopt *sopt)
|
|
{
|
|
struct inpcb *inp = sotoinpcb(so);
|
|
int error, optval;
|
|
|
|
if (sopt->sopt_level != IPPROTO_IP) {
|
|
if ((sopt->sopt_level == SOL_SOCKET) &&
|
|
(sopt->sopt_name == SO_SETFIB)) {
|
|
inp->inp_inc.inc_fibnum = so->so_fibnum;
|
|
return (0);
|
|
}
|
|
return (EINVAL);
|
|
}
|
|
|
|
error = 0;
|
|
switch (sopt->sopt_dir) {
|
|
case SOPT_GET:
|
|
switch (sopt->sopt_name) {
|
|
case IP_HDRINCL:
|
|
optval = inp->inp_flags & INP_HDRINCL;
|
|
error = sooptcopyout(sopt, &optval, sizeof optval);
|
|
break;
|
|
|
|
case IP_FW3: /* generic ipfw v.3 functions */
|
|
case IP_FW_ADD: /* ADD actually returns the body... */
|
|
case IP_FW_GET:
|
|
case IP_FW_TABLE_GETSIZE:
|
|
case IP_FW_TABLE_LIST:
|
|
case IP_FW_NAT_GET_CONFIG:
|
|
case IP_FW_NAT_GET_LOG:
|
|
if (V_ip_fw_ctl_ptr != NULL)
|
|
error = V_ip_fw_ctl_ptr(sopt);
|
|
else
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
|
|
case IP_DUMMYNET3: /* generic dummynet v.3 functions */
|
|
case IP_DUMMYNET_GET:
|
|
if (ip_dn_ctl_ptr != NULL)
|
|
error = ip_dn_ctl_ptr(sopt);
|
|
else
|
|
error = ENOPROTOOPT;
|
|
break ;
|
|
|
|
case MRT_INIT:
|
|
case MRT_DONE:
|
|
case MRT_ADD_VIF:
|
|
case MRT_DEL_VIF:
|
|
case MRT_ADD_MFC:
|
|
case MRT_DEL_MFC:
|
|
case MRT_VERSION:
|
|
case MRT_ASSERT:
|
|
case MRT_API_SUPPORT:
|
|
case MRT_API_CONFIG:
|
|
case MRT_ADD_BW_UPCALL:
|
|
case MRT_DEL_BW_UPCALL:
|
|
error = priv_check(curthread, PRIV_NETINET_MROUTE);
|
|
if (error != 0)
|
|
return (error);
|
|
if (inp->inp_ip_p != IPPROTO_IGMP)
|
|
return (EOPNOTSUPP);
|
|
error = ip_mrouter_get ? ip_mrouter_get(so, sopt) :
|
|
EOPNOTSUPP;
|
|
break;
|
|
|
|
default:
|
|
error = ip_ctloutput(so, sopt);
|
|
break;
|
|
}
|
|
break;
|
|
|
|
case SOPT_SET:
|
|
switch (sopt->sopt_name) {
|
|
case IP_HDRINCL:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
if (optval)
|
|
inp->inp_flags |= INP_HDRINCL;
|
|
else
|
|
inp->inp_flags &= ~INP_HDRINCL;
|
|
break;
|
|
|
|
case IP_FW3: /* generic ipfw v.3 functions */
|
|
case IP_FW_ADD:
|
|
case IP_FW_DEL:
|
|
case IP_FW_FLUSH:
|
|
case IP_FW_ZERO:
|
|
case IP_FW_RESETLOG:
|
|
case IP_FW_TABLE_ADD:
|
|
case IP_FW_TABLE_DEL:
|
|
case IP_FW_TABLE_FLUSH:
|
|
case IP_FW_NAT_CFG:
|
|
case IP_FW_NAT_DEL:
|
|
if (V_ip_fw_ctl_ptr != NULL)
|
|
error = V_ip_fw_ctl_ptr(sopt);
|
|
else
|
|
error = ENOPROTOOPT;
|
|
break;
|
|
|
|
case IP_DUMMYNET3: /* generic dummynet v.3 functions */
|
|
case IP_DUMMYNET_CONFIGURE:
|
|
case IP_DUMMYNET_DEL:
|
|
case IP_DUMMYNET_FLUSH:
|
|
if (ip_dn_ctl_ptr != NULL)
|
|
error = ip_dn_ctl_ptr(sopt);
|
|
else
|
|
error = ENOPROTOOPT ;
|
|
break ;
|
|
|
|
case IP_RSVP_ON:
|
|
error = priv_check(curthread, PRIV_NETINET_MROUTE);
|
|
if (error != 0)
|
|
return (error);
|
|
if (inp->inp_ip_p != IPPROTO_RSVP)
|
|
return (EOPNOTSUPP);
|
|
error = ip_rsvp_init(so);
|
|
break;
|
|
|
|
case IP_RSVP_OFF:
|
|
error = priv_check(curthread, PRIV_NETINET_MROUTE);
|
|
if (error != 0)
|
|
return (error);
|
|
error = ip_rsvp_done();
|
|
break;
|
|
|
|
case IP_RSVP_VIF_ON:
|
|
case IP_RSVP_VIF_OFF:
|
|
error = priv_check(curthread, PRIV_NETINET_MROUTE);
|
|
if (error != 0)
|
|
return (error);
|
|
if (inp->inp_ip_p != IPPROTO_RSVP)
|
|
return (EOPNOTSUPP);
|
|
error = ip_rsvp_vif ?
|
|
ip_rsvp_vif(so, sopt) : EINVAL;
|
|
break;
|
|
|
|
case MRT_INIT:
|
|
case MRT_DONE:
|
|
case MRT_ADD_VIF:
|
|
case MRT_DEL_VIF:
|
|
case MRT_ADD_MFC:
|
|
case MRT_DEL_MFC:
|
|
case MRT_VERSION:
|
|
case MRT_ASSERT:
|
|
case MRT_API_SUPPORT:
|
|
case MRT_API_CONFIG:
|
|
case MRT_ADD_BW_UPCALL:
|
|
case MRT_DEL_BW_UPCALL:
|
|
error = priv_check(curthread, PRIV_NETINET_MROUTE);
|
|
if (error != 0)
|
|
return (error);
|
|
if (inp->inp_ip_p != IPPROTO_IGMP)
|
|
return (EOPNOTSUPP);
|
|
error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
|
|
EOPNOTSUPP;
|
|
break;
|
|
|
|
default:
|
|
error = ip_ctloutput(so, sopt);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
void
|
|
rip_ctlinput(struct icmp *icmp)
|
|
{
|
|
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
|
|
if (IPSEC_ENABLED(ipv4))
|
|
IPSEC_CTLINPUT(ipv4, icmp);
|
|
#endif
|
|
}
|
|
|
|
static int
|
|
rip_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp == NULL, ("rip_attach: inp != NULL"));
|
|
|
|
error = priv_check(td, PRIV_NETINET_RAW);
|
|
if (error)
|
|
return (error);
|
|
if (proto >= IPPROTO_MAX || proto < 0)
|
|
return EPROTONOSUPPORT;
|
|
error = soreserve(so, rip_sendspace, rip_recvspace);
|
|
if (error)
|
|
return (error);
|
|
error = in_pcballoc(so, &V_ripcbinfo);
|
|
if (error)
|
|
return (error);
|
|
inp = (struct inpcb *)so->so_pcb;
|
|
inp->inp_ip_p = proto;
|
|
inp->inp_ip_ttl = V_ip_defttl;
|
|
INP_HASH_WLOCK(&V_ripcbinfo);
|
|
rip_inshash(inp);
|
|
INP_HASH_WUNLOCK(&V_ripcbinfo);
|
|
INP_WUNLOCK(inp);
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
rip_detach(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("rip_detach: inp == NULL"));
|
|
KASSERT(inp->inp_faddr.s_addr == INADDR_ANY,
|
|
("rip_detach: not closed"));
|
|
|
|
/* Disable mrouter first */
|
|
if (so == V_ip_mrouter && ip_mrouter_done)
|
|
ip_mrouter_done();
|
|
|
|
INP_WLOCK(inp);
|
|
INP_HASH_WLOCK(&V_ripcbinfo);
|
|
rip_delhash(inp);
|
|
INP_HASH_WUNLOCK(&V_ripcbinfo);
|
|
|
|
if (ip_rsvp_force_done)
|
|
ip_rsvp_force_done(so);
|
|
if (so == V_ip_rsvpd)
|
|
ip_rsvp_done();
|
|
in_pcbdetach(inp);
|
|
in_pcbfree(inp);
|
|
}
|
|
|
|
static void
|
|
rip_dodisconnect(struct socket *so, struct inpcb *inp)
|
|
{
|
|
struct inpcbinfo *pcbinfo;
|
|
|
|
pcbinfo = inp->inp_pcbinfo;
|
|
INP_WLOCK(inp);
|
|
INP_HASH_WLOCK(pcbinfo);
|
|
rip_delhash(inp);
|
|
inp->inp_faddr.s_addr = INADDR_ANY;
|
|
rip_inshash(inp);
|
|
INP_HASH_WUNLOCK(pcbinfo);
|
|
SOCK_LOCK(so);
|
|
so->so_state &= ~SS_ISCONNECTED;
|
|
SOCK_UNLOCK(so);
|
|
INP_WUNLOCK(inp);
|
|
}
|
|
|
|
static void
|
|
rip_abort(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("rip_abort: inp == NULL"));
|
|
|
|
rip_dodisconnect(so, inp);
|
|
}
|
|
|
|
static void
|
|
rip_close(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("rip_close: inp == NULL"));
|
|
|
|
rip_dodisconnect(so, inp);
|
|
}
|
|
|
|
static int
|
|
rip_disconnect(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
if ((so->so_state & SS_ISCONNECTED) == 0)
|
|
return (ENOTCONN);
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("rip_disconnect: inp == NULL"));
|
|
|
|
rip_dodisconnect(so, inp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rip_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)nam;
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
if (nam->sa_family != AF_INET)
|
|
return (EAFNOSUPPORT);
|
|
if (nam->sa_len != sizeof(*addr))
|
|
return (EINVAL);
|
|
|
|
error = prison_check_ip4(td->td_ucred, &addr->sin_addr);
|
|
if (error != 0)
|
|
return (error);
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("rip_bind: inp == NULL"));
|
|
|
|
if (CK_STAILQ_EMPTY(&V_ifnet) ||
|
|
(addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK) ||
|
|
(addr->sin_addr.s_addr &&
|
|
(inp->inp_flags & INP_BINDANY) == 0 &&
|
|
ifa_ifwithaddr_check((struct sockaddr *)addr) == 0))
|
|
return (EADDRNOTAVAIL);
|
|
|
|
INP_WLOCK(inp);
|
|
INP_HASH_WLOCK(&V_ripcbinfo);
|
|
rip_delhash(inp);
|
|
inp->inp_laddr = addr->sin_addr;
|
|
rip_inshash(inp);
|
|
INP_HASH_WUNLOCK(&V_ripcbinfo);
|
|
INP_WUNLOCK(inp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rip_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct sockaddr_in *addr = (struct sockaddr_in *)nam;
|
|
struct inpcb *inp;
|
|
|
|
if (nam->sa_len != sizeof(*addr))
|
|
return (EINVAL);
|
|
if (CK_STAILQ_EMPTY(&V_ifnet))
|
|
return (EADDRNOTAVAIL);
|
|
if (addr->sin_family != AF_INET && addr->sin_family != AF_IMPLINK)
|
|
return (EAFNOSUPPORT);
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("rip_connect: inp == NULL"));
|
|
|
|
INP_WLOCK(inp);
|
|
INP_HASH_WLOCK(&V_ripcbinfo);
|
|
rip_delhash(inp);
|
|
inp->inp_faddr = addr->sin_addr;
|
|
rip_inshash(inp);
|
|
INP_HASH_WUNLOCK(&V_ripcbinfo);
|
|
soisconnected(so);
|
|
INP_WUNLOCK(inp);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
rip_shutdown(struct socket *so)
|
|
{
|
|
struct inpcb *inp;
|
|
|
|
inp = sotoinpcb(so);
|
|
KASSERT(inp != NULL, ("rip_shutdown: inp == NULL"));
|
|
|
|
INP_WLOCK(inp);
|
|
socantsendmore(so);
|
|
INP_WUNLOCK(inp);
|
|
return (0);
|
|
}
|
|
#endif /* INET */
|
|
|
|
static int
|
|
rip_pcblist(SYSCTL_HANDLER_ARGS)
|
|
{
|
|
struct inpcb_iterator inpi = INP_ALL_ITERATOR(&V_ripcbinfo,
|
|
INPLOOKUP_RLOCKPCB);
|
|
struct xinpgen xig;
|
|
struct inpcb *inp;
|
|
int error;
|
|
|
|
if (req->newptr != 0)
|
|
return (EPERM);
|
|
|
|
if (req->oldptr == 0) {
|
|
int n;
|
|
|
|
n = V_ripcbinfo.ipi_count;
|
|
n += imax(n / 8, 10);
|
|
req->oldidx = 2 * (sizeof xig) + n * sizeof(struct xinpcb);
|
|
return (0);
|
|
}
|
|
|
|
if ((error = sysctl_wire_old_buffer(req, 0)) != 0)
|
|
return (error);
|
|
|
|
bzero(&xig, sizeof(xig));
|
|
xig.xig_len = sizeof xig;
|
|
xig.xig_count = V_ripcbinfo.ipi_count;
|
|
xig.xig_gen = V_ripcbinfo.ipi_gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
if (error)
|
|
return (error);
|
|
|
|
while ((inp = inp_next(&inpi)) != NULL) {
|
|
if (inp->inp_gencnt <= xig.xig_gen &&
|
|
cr_canseeinpcb(req->td->td_ucred, inp) == 0) {
|
|
struct xinpcb xi;
|
|
|
|
in_pcbtoxinpcb(inp, &xi);
|
|
error = SYSCTL_OUT(req, &xi, sizeof xi);
|
|
if (error) {
|
|
INP_RUNLOCK(inp);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!error) {
|
|
/*
|
|
* Give the user an updated idea of our state. If the
|
|
* generation differs from what we told her before, she knows
|
|
* that something happened while we were processing this
|
|
* request, and it might be necessary to retry.
|
|
*/
|
|
xig.xig_gen = V_ripcbinfo.ipi_gencnt;
|
|
xig.xig_sogen = so_gencnt;
|
|
xig.xig_count = V_ripcbinfo.ipi_count;
|
|
error = SYSCTL_OUT(req, &xig, sizeof xig);
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
SYSCTL_PROC(_net_inet_raw, OID_AUTO/*XXX*/, pcblist,
|
|
CTLTYPE_OPAQUE | CTLFLAG_RD | CTLFLAG_MPSAFE, NULL, 0,
|
|
rip_pcblist, "S,xinpcb",
|
|
"List of active raw IP sockets");
|
|
|
|
#ifdef INET
|
|
struct protosw rip_protosw = {
|
|
.pr_type = SOCK_RAW,
|
|
.pr_flags = PR_ATOMIC|PR_ADDR,
|
|
.pr_ctloutput = rip_ctloutput,
|
|
.pr_abort = rip_abort,
|
|
.pr_attach = rip_attach,
|
|
.pr_bind = rip_bind,
|
|
.pr_connect = rip_connect,
|
|
.pr_control = in_control,
|
|
.pr_detach = rip_detach,
|
|
.pr_disconnect = rip_disconnect,
|
|
.pr_peeraddr = in_getpeeraddr,
|
|
.pr_send = rip_send,
|
|
.pr_shutdown = rip_shutdown,
|
|
.pr_sockaddr = in_getsockaddr,
|
|
.pr_sosetlabel = in_pcbsosetlabel,
|
|
.pr_close = rip_close
|
|
};
|
|
#endif /* INET */
|