raw_ip.c

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/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1982, 1986, 1988, 1993
 *      The Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)raw_ip.c    8.7 (Berkeley) 5/15/95
 */
 
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
 
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_route.h"
 
#include <sys/param.h>
#include <sys/jail.h>
#include <sys/kernel.h>
#include <sys/eventhandler.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/priv.h>
#include <sys/proc.h>
#include <sys/protosw.h>
#include <sys/rwlock.h>
#include <sys/signalvar.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sx.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
 
#include <vm/uma.h>
 
#include <net/if.h>
#include <net/if_var.h>
#include <net/route.h>
#include <net/route/route_ctl.h>
#include <net/vnet.h>
 
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_fib.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/if_ether.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_mroute.h>
#include <netinet/ip_icmp.h>
 
#include <netipsec/ipsec_support.h>
 
#include <machine/stdarg.h>
#include <security/mac/mac_framework.h>
 
VNET_DEFINE(int, ip_defttl) = IPDEFTTL;
SYSCTL_INT(_net_inet_ip, IPCTL_DEFTTL, ttl, CTLFLAG_VNET | CTLFLAG_RW,
    &VNET_NAME(ip_defttl), 0,
    "Maximum TTL on IP packets");
 
VNET_DEFINE(struct inpcbinfo, ripcbinfo);
#define V_ripcbinfo             VNET(ripcbinfo)
 
/*
 * Control and data hooks for ipfw, dummynet, divert and so on.
 * The data hooks are not used here but it is convenient
 * to keep them all in one place.
 */
VNET_DEFINE(ip_fw_chk_ptr_t, ip_fw_chk_ptr) = NULL;
VNET_DEFINE(ip_fw_ctl_ptr_t, ip_fw_ctl_ptr) = NULL;
 
int     (*ip_dn_ctl_ptr)(struct sockopt *);
int     (*ip_dn_io_ptr)(struct mbuf **, struct ip_fw_args *);
void    (*ip_divert_ptr)(struct mbuf *, bool);
int     (*ng_ipfw_input_p)(struct mbuf **, struct ip_fw_args *, bool);
 
#ifdef INET
/*
 * Hooks for multicast routing. They all default to NULL, so leave them not
 * initialized and rely on BSS being set to 0.
 */
 
/*
 * The socket used to communicate with the multicast routing daemon.
 */
VNET_DEFINE(struct socket *, ip_mrouter);
 
/*
 * The various mrouter and rsvp functions.
 */
int (*ip_mrouter_set)(struct socket *, struct sockopt *);
int (*ip_mrouter_get)(struct socket *, struct sockopt *);
int (*ip_mrouter_done)(void);
int (*ip_mforward)(struct ip *, struct ifnet *, struct mbuf *,
                   struct ip_moptions *);
int (*mrt_ioctl)(u_long, caddr_t, int);
int (*legal_vif_num)(int);
u_long (*ip_mcast_src)(int);
 
int (*rsvp_input_p)(struct mbuf **, int *, int);
int (*ip_rsvp_vif)(struct socket *, struct sockopt *);
void (*ip_rsvp_force_done)(struct socket *);
#endif /* INET */
 
extern  struct protosw inetsw[];
 
u_long  rip_sendspace = 9216;
SYSCTL_ULONG(_net_inet_raw, OID_AUTO, maxdgram, CTLFLAG_RW,
    &rip_sendspace, 0, "Maximum outgoing raw IP datagram size");
 
u_long  rip_recvspace = 9216;
SYSCTL_ULONG(_net_inet_raw, OID_AUTO, recvspace, CTLFLAG_RW,
    &rip_recvspace, 0, "Maximum space for incoming raw IP datagrams");
 
/*
 * Hash functions
 */
 
#define INP_PCBHASH_RAW_SIZE    256
#define INP_PCBHASH_RAW(proto, laddr, faddr, mask) \
        (((proto) + (laddr) + (faddr)) % (mask) + 1)
 
#ifdef INET
static void
rip_inshash(struct inpcb *inp)
{
        struct inpcbinfo *pcbinfo = inp->inp_pcbinfo;
        struct inpcbhead *pcbhash;
        int hash;
 
        INP_HASH_WLOCK_ASSERT(pcbinfo);
        INP_WLOCK_ASSERT(inp);
 
        if (inp->inp_ip_p != 0 &&
            inp->inp_laddr.s_addr != INADDR_ANY &&
            inp->inp_faddr.s_addr != INADDR_ANY) {
                hash = INP_PCBHASH_RAW(inp->inp_ip_p, inp->inp_laddr.s_addr,
                    inp->inp_faddr.s_addr, pcbinfo->ipi_hashmask);
        } else
                hash = 0;
        pcbhash = &pcbinfo->ipi_hashbase[hash];
        CK_LIST_INSERT_HEAD(pcbhash, inp, inp_hash);
}
 
static void
rip_delhash(struct inpcb *inp)
{
 
        INP_HASH_WLOCK_ASSERT(inp->inp_pcbinfo);
        INP_WLOCK_ASSERT(inp);
 
        CK_LIST_REMOVE(inp, inp_hash);
}
#endif /* INET */
 
INPCBSTORAGE_DEFINE(ripcbstor, "rawinp", "ripcb", "rip", "riphash");
 
static void
rip_init(void *arg __unused)
{
 
        in_pcbinfo_init(&V_ripcbinfo, &ripcbstor, INP_PCBHASH_RAW_SIZE, 1);
}
VNET_SYSINIT(rip_init, SI_SUB_PROTO_DOMAIN, SI_ORDER_THIRD, rip_init, NULL);
 
#ifdef VIMAGE
static void
rip_destroy(void *unused __unused)
{
 
        in_pcbinfo_destroy(&V_ripcbinfo);
}
VNET_SYSUNINIT(raw_ip, SI_SUB_PROTO_DOMAIN, SI_ORDER_FOURTH, rip_destroy, NULL);
#endif
 
#ifdef INET
static int
rip_append(struct inpcb *inp, struct ip *ip, struct mbuf *m,
    struct sockaddr_in *ripsrc)
{
        struct socket *so = inp->inp_socket;
        struct mbuf *n, *opts = NULL;
 
        INP_LOCK_ASSERT(inp);
 
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
        /* check AH/ESP integrity. */
        if (IPSEC_ENABLED(ipv4) && IPSEC_CHECK_POLICY(ipv4, m, inp) != 0)
                return (0);
#endif /* IPSEC */
#ifdef MAC
        if (mac_inpcb_check_deliver(inp, m) != 0)
                return (0);
#endif
        /* Check the minimum TTL for socket. */
        if (inp->inp_ip_minttl && inp->inp_ip_minttl > ip->ip_ttl)
                return (0);
 
        if ((n = m_copym(m, 0, M_COPYALL, M_NOWAIT)) == NULL)
                return (0);
 
        if ((inp->inp_flags & INP_CONTROLOPTS) ||
            (so->so_options & (SO_TIMESTAMP | SO_BINTIME)))
                ip_savecontrol(inp, &opts, ip, n);
        SOCKBUF_LOCK(&so->so_rcv);
        if (sbappendaddr_locked(&so->so_rcv,
            (struct sockaddr *)ripsrc, n, opts) == 0) {
                soroverflow_locked(so);
                m_freem(n);
                if (opts)
                        m_freem(opts);
                return (0);
        }
        sorwakeup_locked(so);
 
        return (1);
}
 
struct rip_inp_match_ctx {
        struct ip *ip;
        int proto;
};
 
static bool
rip_inp_match1(const struct inpcb *inp, void *v)
{
        struct rip_inp_match_ctx *ctx = v;
 
        if (inp->inp_ip_p != ctx->proto)
                return (false);
#ifdef INET6
        /* XXX inp locking */
        if ((inp->inp_vflag & INP_IPV4) == 0)
                return (false);
#endif
        if (inp->inp_laddr.s_addr != ctx->ip->ip_dst.s_addr)
                return (false);
        if (inp->inp_faddr.s_addr != ctx->ip->ip_src.s_addr)
                return (false);
        return (true);
}
 
static bool
rip_inp_match2(const struct inpcb *inp, void *v)
{
        struct rip_inp_match_ctx *ctx = v;
 
        if (inp->inp_ip_p && inp->inp_ip_p != ctx->proto)
                return (false);
#ifdef INET6
        /* XXX inp locking */
        if ((inp->inp_vflag & INP_IPV4) == 0)
                return (false);
#endif
        if (!in_nullhost(inp->inp_laddr) &&
            !in_hosteq(inp->inp_laddr, ctx->ip->ip_dst))
                return (false);
        if (!in_nullhost(inp->inp_faddr) &&
            !in_hosteq(inp->inp_faddr, ctx->ip->ip_src))
                return (false);
        return (true);
}
 
/*
 * Setup generic address and protocol structures for raw_input routine, then
 * pass them along with mbuf chain.
 */
int
rip_input(struct mbuf **mp, int *offp, int proto)
{
        struct rip_inp_match_ctx ctx = {
                .ip = mtod(*mp, struct ip *),
                .proto = proto,
        };
        struct inpcb_iterator inpi = INP_ITERATOR(&V_ripcbinfo,
            INPLOOKUP_RLOCKPCB, rip_inp_match1, &ctx);
        struct ifnet *ifp;
        struct mbuf *m = *mp;
        struct inpcb *inp;
        struct sockaddr_in ripsrc;
        int appended;
 
        *mp = NULL;
        appended = 0;
 
        bzero(&ripsrc, sizeof(ripsrc));
        ripsrc.sin_len = sizeof(ripsrc);
        ripsrc.sin_family = AF_INET;
        ripsrc.sin_addr = ctx.ip->ip_src;
 
        ifp = m->m_pkthdr.rcvif;
 
        inpi.hash = INP_PCBHASH_RAW(proto, ctx.ip->ip_src.s_addr,
            ctx.ip->ip_dst.s_addr, V_ripcbinfo.ipi_hashmask);
        while ((inp = inp_next(&inpi)) != NULL) {
                INP_RLOCK_ASSERT(inp);
                if (jailed_without_vnet(inp->inp_cred) &&
                    prison_check_ip4(inp->inp_cred, &ctx.ip->ip_dst) != 0) {
                        /*
                         * XXX: If faddr was bound to multicast group,
                         * jailed raw socket will drop datagram.
                         */
                        continue;
                }
                appended += rip_append(inp, ctx.ip, m, &ripsrc);
        }
 
        inpi.hash = 0;
        inpi.match = rip_inp_match2;
        MPASS(inpi.inp == NULL);
        while ((inp = inp_next(&inpi)) != NULL) {
                INP_RLOCK_ASSERT(inp);
                if (jailed_without_vnet(inp->inp_cred) &&
                    !IN_MULTICAST(ntohl(ctx.ip->ip_dst.s_addr)) &&
                    prison_check_ip4(inp->inp_cred, &ctx.ip->ip_dst) != 0)
                        /*
                         * Allow raw socket in jail to receive multicast;
                         * assume process had PRIV_NETINET_RAW at attach,
                         * and fall through into normal filter path if so.
                         */
                        continue;
                /*
                 * If this raw socket has multicast state, and we
                 * have received a multicast, check if this socket
                 * should receive it, as multicast filtering is now
                 * the responsibility of the transport layer.
                 */
                if (inp->inp_moptions != NULL &&
                    IN_MULTICAST(ntohl(ctx.ip->ip_dst.s_addr))) {
                        /*
                         * If the incoming datagram is for IGMP, allow it
                         * 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
                         * on the interface. imo_multi_filter() may discard
                         * control traffic we actually need to see.
                         *
                         * Userland multicast routing daemons should continue
                         * filter the control traffic appropriately.
                         */
                        int blocked;
 
                        blocked = MCAST_PASS;
                        if (proto != IPPROTO_IGMP) {
                                struct sockaddr_in group;
 
                                bzero(&group, sizeof(struct sockaddr_in));
                                group.sin_len = sizeof(struct sockaddr_in);
                                group.sin_family = AF_INET;
                                group.sin_addr = ctx.ip->ip_dst;
 
                                blocked = imo_multi_filter(inp->inp_moptions,
                                    ifp,
                                    (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 &&
            inetsw[ip_protox[ctx.ip->ip_p]].pr_input == 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.
 */
int
rip_output(struct mbuf *m, struct socket *so, ...)
{
        struct epoch_tracker et;
        struct ip *ip;
        int error;
        struct inpcb *inp = sotoinpcb(so);
        va_list ap;
        u_long dst;
        int flags = ((so->so_options & SO_DONTROUTE) ? IP_ROUTETOIF : 0) |
            IP_ALLOWBROADCAST;
        int cnt, hlen;
        u_char opttype, optlen, *cp;
 
        va_start(ap, so);
        dst = va_arg(ap, u_long);
        va_end(ap);
 
        /*
         * 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);
                        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);
                        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);
                        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);
                        error = ip_mrouter_set ? ip_mrouter_set(so, sopt) :
                                        EOPNOTSUPP;
                        break;
 
                default:
                        error = ip_ctloutput(so, sopt);
                        break;
                }
                break;
        }
 
        return (error);
}
 
/*
 * This function exists solely to receive the PRC_IFDOWN messages which are
 * sent by if_down().  It looks for an ifaddr whose ifa_addr is sa, and calls
 * in_ifadown() to remove all routes corresponding to that address.  It also
 * receives the PRC_IFUP messages from if_up() and reinstalls the interface
 * routes.
 */
void
rip_ctlinput(int cmd, struct sockaddr *sa, void *vip)
{
        struct in_ifaddr *ia;
        int err;
 
        NET_EPOCH_ASSERT();
 
        switch (cmd) {
        case PRC_IFDOWN:
                CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
                        if (ia->ia_ifa.ifa_addr == sa
                            && (ia->ia_flags & IFA_ROUTE)) {
                                ifa_ref(&ia->ia_ifa);
                                /*
                                 * in_scrubprefix() kills the interface route.
                                 */
                                in_scrubprefix(ia, 0);
                                /*
                                 * in_ifadown gets rid of all the rest of the
                                 * routes.  This is not quite the right thing
                                 * to do, but at least if we are running a
                                 * routing process they will come back.
                                 */
                                in_ifadown(&ia->ia_ifa, 0);
                                ifa_free(&ia->ia_ifa);
                                break;
                        }
                }
                break;
 
        case PRC_IFUP:
                CK_STAILQ_FOREACH(ia, &V_in_ifaddrhead, ia_link) {
                        if (ia->ia_ifa.ifa_addr == sa)
                                break;
                }
                if (ia == NULL || (ia->ia_flags & IFA_ROUTE))
                        return;
                ifa_ref(&ia->ia_ifa);
 
                err = ifa_del_loopback_route((struct ifaddr *)ia, sa);
 
                rt_addrmsg(RTM_ADD, &ia->ia_ifa, ia->ia_ifp->if_fib);
                err = in_handle_ifaddr_route(RTM_ADD, ia);
                if (err == 0)
                        ia->ia_flags |= IFA_ROUTE;
 
                err = ifa_add_loopback_route((struct ifaddr *)ia, sa);
 
                ifa_free(&ia->ia_ifa);
                break;
#if defined(IPSEC) || defined(IPSEC_SUPPORT)
        case PRC_MSGSIZE:
                if (IPSEC_ENABLED(ipv4))
                        IPSEC_CTLINPUT(ipv4, cmd, sa, vip);
                break;
#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_vflag |= INP_IPV4;
        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);
}
 
static int
rip_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *nam,
    struct mbuf *control, struct thread *td)
{
        struct inpcb *inp;
        u_long dst;
        int error;
 
        inp = sotoinpcb(so);
        KASSERT(inp != NULL, ("rip_send: inp == NULL"));
 
        if (control != NULL) {
                m_freem(control);
                control = NULL;
        }
 
        /*
         * Note: 'dst' reads below are unlocked.
         */
        if (so->so_state & SS_ISCONNECTED) {
                if (nam) {
                        error = EISCONN;
                        goto release;
                }
                dst = inp->inp_faddr.s_addr;    /* Unlocked read. */
        } else {
                error = 0;
                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;
                if (error != 0)
                        goto release;
                dst = ((struct sockaddr_in *)nam)->sin_addr.s_addr;
        }
        return (rip_output(m, so, dst));
 
release:
        m_freem(m);
        return (error);
}
#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 pr_usrreqs rip_usrreqs = {
        .pru_abort =            rip_abort,
        .pru_attach =           rip_attach,
        .pru_bind =             rip_bind,
        .pru_connect =          rip_connect,
        .pru_control =          in_control,
        .pru_detach =           rip_detach,
        .pru_disconnect =       rip_disconnect,
        .pru_peeraddr =         in_getpeeraddr,
        .pru_send =             rip_send,
        .pru_shutdown =         rip_shutdown,
        .pru_sockaddr =         in_getsockaddr,
        .pru_sosetlabel =       in_pcbsosetlabel,
        .pru_close =            rip_close,
};
#endif /* INET */