arch/cpu.resource: remove dead code

[AROS.git] / workbench / network / stacks / AROSTCP / bsdsocket / netinet / udp_usrreq.c

/*
 * Copyright (c) 1982, 1986, 1988, 1990, 1993
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 2006
 *      Pavel Fedin
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 *      @(#)udp_usrreq.c        8.4 (Berkeley) 1/21/94
 * $Id$
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/stat.h>
#include <sys/queue.h>
#include <sys/synch.h>
#ifdef ENABLE_SYSCTL
#include <sys/sysctl.h>
#endif

#include <net/route.h>
#include <net/if.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>

#include <kern/kern_subr_protos.h>

/*
 * UDP protocol implementation.
 * Per RFC 768, August, 1980.
 */
#ifndef COMPAT_42
int     udpcksum = 1;
#else
int     udpcksum = 0;           /* XXX */
#endif

struct  inpcbhead udb;          /* from udp_var.h */
struct  inpcbinfo udbinfo;

#ifndef UDBHASHSIZE
#define UDBHASHSIZE 64
#endif

struct  udpstat udpstat;        /* from udp_var.h */

struct  sockaddr_in udp_in = { sizeof(udp_in), AF_INET };

extern struct in_addr zeroin_addr;
extern u_char inetctlerrmap[];
extern int ip_defttl;

static  void udp_detach __P((struct inpcb *));
static  void udp_notify __P((struct inpcb *, int));
static  struct mbuf *udp_saveopt __P((caddr_t, int, int));

void
udp_init()
{
        LIST_INIT(&udb);
        udbinfo.listhead = &udb;
        udbinfo.hashbase = phashinit(UDBHASHSIZE, M_PCB, &udbinfo.hashsize);
}

void udp_input(void *args, ...)
{
        register struct ip *ip;
        register struct udphdr *uh;
        register struct inpcb *inp;
        struct mbuf *opts = 0;
        int len;
        struct ip save_ip;
        register struct mbuf *m = args;
        int iphlen;
        va_list va;

        va_start(va, args);
        iphlen = va_arg(va, int);
        va_end(va);

        udpstat.udps_ipackets++;

        /*
         * Strip IP options, if any; should skip this,
         * make available to user, and use on returned packets,
         * but we don't yet have a way to check the checksum
         * with options still present.
         */
        if (iphlen > sizeof (struct ip)) {
                ip_stripoptions(m, (struct mbuf *)0);
                iphlen = sizeof(struct ip);
        }

        /*
         * Get IP and UDP header together in first mbuf.
         */
        ip = mtod(m, struct ip *);
        if (m->m_len < iphlen + sizeof(struct udphdr)) {
                if ((m = m_pullup(m, iphlen + sizeof(struct udphdr))) == 0) {
                        udpstat.udps_hdrops++;
                        return;
                }
                ip = mtod(m, struct ip *);
        }
        uh = (struct udphdr *)((caddr_t)ip + iphlen);

        /*
         * Make mbuf data length reflect UDP length.
         * If not enough data to reflect UDP length, drop.
         */
        len = ntohs((u_short)uh->uh_ulen);
        if (ip->ip_len != len) {
                if (len > ip->ip_len) {
                        udpstat.udps_badlen++;
                        goto bad;
                }
                m_adj(m, len - ip->ip_len);
                /* ip->ip_len = len; */
        }
        /*
         * Save a copy of the IP header in case we want restore it
         * for sending an ICMP error message in response.
         */
        save_ip = *ip;

        /*
         * Checksum extended UDP header and data.
         */
        if (udpcksum && uh->uh_sum) {
                bzero(((struct ipovly *)ip)->ih_x1, 9);
                ((struct ipovly *)ip)->ih_len = uh->uh_ulen;
                uh->uh_sum = in_cksum(m, len + sizeof (struct ip));
                if (uh->uh_sum) {
                        udpstat.udps_badsum++;
                        m_freem(m);
                        return;
                }
        }

        if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) ||
            in_broadcast(ip->ip_dst, m->m_pkthdr.rcvif)) {
                struct socket *last;
                /*
                 * Deliver a multicast or broadcast datagram to *all* sockets
                 * for which the local and remote addresses and ports match
                 * those of the incoming datagram.  This allows more than
                 * one process to receive multi/broadcasts on the same port.
                 * (This really ought to be done for unicast datagrams as
                 * well, but that would cause problems with existing
                 * applications that open both address-specific sockets and
                 * a wildcard socket listening to the same port -- they would
                 * end up receiving duplicates of every unicast datagram.
                 * Those applications open the multiple sockets to overcome an
                 * inadequacy of the UDP socket interface, but for backwards
                 * compatibility we avoid the problem here rather than
                 * fixing the interface.  Maybe 4.5BSD will remedy this?)
                 */

                /*
                 * Construct sockaddr format source address.
                 */
                udp_in.sin_port = uh->uh_sport;
                udp_in.sin_addr = ip->ip_src;
                m->m_len -= sizeof (struct udpiphdr);
                m->m_data += sizeof (struct udpiphdr);
                /*
                 * Locate pcb(s) for datagram.
                 * (Algorithm copied from raw_intr().)
                 */
                last = NULL;
                for (inp = udb.lh_first; inp != NULL; inp = inp->inp_list.le_next) {
                        if (inp->inp_lport != uh->uh_dport)
                                continue;
                        if (inp->inp_laddr.s_addr != INADDR_ANY) {
                                if (inp->inp_laddr.s_addr !=
                                    ip->ip_dst.s_addr)
                                        continue;
                        }
                        if (inp->inp_faddr.s_addr != INADDR_ANY) {
                                if (inp->inp_faddr.s_addr !=
                                    ip->ip_src.s_addr ||
                                    inp->inp_fport != uh->uh_sport)
                                        continue;
                        }

                        if (last != NULL) {
                                struct mbuf *n;

                                if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
                                        if (sbappendaddr(&last->so_rcv,
                                                (struct sockaddr *)&udp_in,
                                                n, (struct mbuf *)0) == 0) {
                                                m_freem(n);
                                                udpstat.udps_fullsock++;
                                        } else
                                                sorwakeup(last);
                                }
                        }
                        last = inp->inp_socket;
                        /*
                         * Don't look for additional matches if this one does
                         * not have either the SO_REUSEPORT or SO_REUSEADDR
                         * socket options set.  This heuristic avoids searching
                         * through all pcbs in the common case of a non-shared
                         * port.  It * assumes that an application will never
                         * clear these options after setting them.
                         */
                        if ((last->so_options&(SO_REUSEPORT|SO_REUSEADDR) == 0))
                                break;
                }

                if (last == NULL) {
                        /*
                         * No matching pcb found; discard datagram.
                         * (No need to send an ICMP Port Unreachable
                         * for a broadcast or multicast datgram.)
                         */
                        udpstat.udps_noportbcast++;
                        goto bad;
                }
                if (sbappendaddr(&last->so_rcv, (struct sockaddr *)&udp_in,
                     m, (struct mbuf *)0) == 0) {
                        udpstat.udps_fullsock++;
                        goto bad;
                }
                sorwakeup(last);
                return;
        }
        /*
         * Locate pcb for datagram. First look for an exact match.
         */
        inp = in_pcblookuphash(&udbinfo, ip->ip_src, uh->uh_sport,
            ip->ip_dst, uh->uh_dport);
        /*
         * ...and if that fails, do a wildcard search.
         */
        if (inp == NULL) {
                inp = in_pcblookup(&udb, ip->ip_src, uh->uh_sport, ip->ip_dst,
                    uh->uh_dport, INPLOOKUP_WILDCARD);
        }
        if (inp == NULL) {
                udpstat.udps_noport++;
                if (m->m_flags & (M_BCAST | M_MCAST)) {
                        udpstat.udps_noportbcast++;
                        goto bad;
                }
                *ip = save_ip;
                icmp_error(m, ICMP_UNREACH, ICMP_UNREACH_PORT, 0, 0);
                return;
        }

        /*
         * Construct sockaddr format source address.
         * Stuff source address and datagram in user buffer.
         */
        udp_in.sin_port = uh->uh_sport;
        udp_in.sin_addr = ip->ip_src;
        if (inp->inp_flags & INP_CONTROLOPTS) {
                struct mbuf **mp = &opts;

                if (inp->inp_flags & INP_RECVDSTADDR) {
                        *mp = udp_saveopt((caddr_t) &ip->ip_dst,
                            sizeof(struct in_addr), IP_RECVDSTADDR);
                        if (*mp)
                                mp = &(*mp)->m_next;
                }
#ifdef notyet
                /* options were tossed above */
                if (inp->inp_flags & INP_RECVOPTS) {
                        *mp = udp_saveopt((caddr_t) opts_deleted_above,
                            sizeof(struct in_addr), IP_RECVOPTS);
                        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 = udp_saveopt((caddr_t) ip_srcroute(),
                            sizeof(struct in_addr), IP_RECVRETOPTS);
                        if (*mp)
                                mp = &(*mp)->m_next;
                }
#endif
        }
        iphlen += sizeof(struct udphdr);
        m->m_len -= iphlen;
        m->m_pkthdr.len -= iphlen;
        m->m_data += iphlen;
        if (sbappendaddr(&inp->inp_socket->so_rcv, (struct sockaddr *)&udp_in,
            m, opts) == 0) {
                udpstat.udps_fullsock++;
                goto bad;
        }
        sorwakeup(inp->inp_socket);
        return;
bad:
        m_freem(m);
        if (opts)
                m_freem(opts);
}

/*
 * Create a "control" mbuf containing the specified data
 * with the specified type for presentation with a datagram.
 */
struct mbuf *
udp_saveopt(p, size, type)
        caddr_t p;
        register int size;
        int type;
{
        register struct cmsghdr *cp;
        struct mbuf *m;

        if ((m = m_get(M_DONTWAIT, MT_CONTROL)) == NULL)
                return ((struct mbuf *) NULL);
        cp = (struct cmsghdr *) mtod(m, struct cmsghdr *);
        (void)memcpy(CMSG_DATA(cp), p, size);
        size += sizeof(*cp);
        m->m_len = size;
        cp->cmsg_len = size;
        cp->cmsg_level = IPPROTO_IP;
        cp->cmsg_type = type;
        return (m);
}

/*
 * Notify a udp user of an asynchronous error;
 * just wake up so that he can collect error status.
 */
static void
udp_notify(inp, _errno)
        register struct inpcb *inp;
        int _errno;
{
        inp->inp_socket->so_error = _errno;
        sorwakeup(inp->inp_socket);
        sowwakeup(inp->inp_socket);
}

void
udp_ctlinput(cmd, sa, arg)
        int cmd;
        struct sockaddr *sa;
        void *arg;
{
        register struct ip *ip = arg;
        register struct udphdr *uh;

        if (!PRC_IS_REDIRECT(cmd) &&
            ((unsigned)cmd >= PRC_NCMDS || inetctlerrmap[cmd] == 0))
                return;
        if (ip) {
                uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2));
                in_pcbnotify(&udb, sa, uh->uh_dport, ip->ip_src, uh->uh_sport,
                        cmd, udp_notify);
        } else
                in_pcbnotify(&udb, sa, 0, zeroin_addr, 0, cmd, udp_notify);
}

int
udp_output(void *arg, ...)
{
        register struct inpcb *inp = arg;
        register struct mbuf *m;
        struct mbuf *addr, *control;
        register struct udpiphdr *ui;
        register int len;
        struct in_addr laddr;
        int s = 0, error = 0;
        va_list va;

        va_start(va, arg);
        m       = va_arg(va, struct mbuf *);
        addr    = va_arg(va, struct mbuf *);
        control = va_arg(va, struct mbuf *);
        va_end(va);

        len = m->m_pkthdr.len;

        if (control)
                m_freem(control);               /* XXX */

        if (addr) {
                laddr = inp->inp_laddr;
                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                        error = EISCONN;
                        goto release;
                }
                /*
                 * Must block input while temporarily connected.
                 */
                s = splnet();
                error = in_pcbconnect(inp, addr);
                if (error) {
                        splx(s);
                        goto release;
                }
        } else {
                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                        error = ENOTCONN;
                        goto release;
                }
        }
        /*
         * Calculate data length and get a mbuf
         * for UDP and IP headers.
         */
        M_PREPEND(m, sizeof(struct udpiphdr), M_DONTWAIT);
        if (m == 0) {
                error = ENOBUFS;
                if (addr)
                        splx(s);
                goto release;
        }

        /*
         * Fill in mbuf with extended UDP header
         * and addresses and length put into network format.
         */
        ui = mtod(m, struct udpiphdr *);
        bzero(ui->ui_x1, sizeof(ui->ui_x1));
        ui->ui_pr = IPPROTO_UDP;
        ui->ui_len = htons((u_short)len + sizeof (struct udphdr));
        ui->ui_src = inp->inp_laddr;
        ui->ui_dst = inp->inp_faddr;
        ui->ui_sport = inp->inp_lport;
        ui->ui_dport = inp->inp_fport;
        ui->ui_ulen = ui->ui_len;

        /*
         * Stuff checksum and output datagram.
         */
        ui->ui_sum = 0;
        if (udpcksum) {
            if ((ui->ui_sum = in_cksum(m, sizeof (struct udpiphdr) + len)) == 0)
                ui->ui_sum = 0xffff;
        }
        ((struct ip *)ui)->ip_len = sizeof (struct udpiphdr) + len;
        ((struct ip *)ui)->ip_ttl = inp->inp_ip.ip_ttl; /* XXX */
        ((struct ip *)ui)->ip_tos = inp->inp_ip.ip_tos; /* XXX */
        udpstat.udps_opackets++;
        error = ip_output(m, inp->inp_options, &inp->inp_route,
            inp->inp_socket->so_options & (SO_DONTROUTE | SO_BROADCAST),
            inp->inp_moptions);

        if (addr) {
                in_pcbdisconnect(inp);
                inp->inp_laddr = laddr;
                splx(s);
        }
        return (error);

release:
        m_freem(m);
        return (error);
}

u_long  udp_sendspace = 9216;           /* really max datagram size */
u_long  udp_recvspace = 40 * (1024 + sizeof(struct sockaddr_in));
                                        /* 40 1K datagrams */

/*ARGSUSED*/
int
udp_usrreq(so, req, m, addr, control)
        struct socket *so;
        int req;
        struct mbuf *m, *addr, *control;
{
        struct inpcb *inp = sotoinpcb(so);
        int error = 0;
        int s;

        if (req == PRU_CONTROL)
                return (in_control(so, (long)m, (caddr_t)addr,
                        (struct ifnet *)control));
        if (inp == NULL && req != PRU_ATTACH) {
                error = EINVAL;
                goto release;
        }
        /*
         * Note: need to block udp_input while changing
         * the udp pcb queue and/or pcb addresses.
         */
        switch (req) {

        case PRU_ATTACH:
                if (inp != NULL) {
                        error = EINVAL;
                        break;
                }
                s = splnet();
                error = in_pcballoc(so, &udbinfo);
                splx(s);
                if (error)
                        break;
                error = soreserve(so, udp_sendspace, udp_recvspace);
                if (error)
                        break;
                ((struct inpcb *) so->so_pcb)->inp_ip.ip_ttl = ip_defttl;
                break;

        case PRU_DETACH:
                udp_detach(inp);
                break;

        case PRU_BIND:
                s = splnet();
                error = in_pcbbind(inp, addr);
                splx(s);
                break;

        case PRU_LISTEN:
                error = EOPNOTSUPP;
                break;

        case PRU_CONNECT:
                if (inp->inp_faddr.s_addr != INADDR_ANY) {
                        error = EISCONN;
                        break;
                }
                s = splnet();
                error = in_pcbconnect(inp, addr);
                splx(s);
                if (error == 0)
                        soisconnected(so);
                break;

        case PRU_CONNECT2:
                error = EOPNOTSUPP;
                break;

        case PRU_ACCEPT:
                error = EOPNOTSUPP;
                break;

        case PRU_DISCONNECT:
                if (inp->inp_faddr.s_addr == INADDR_ANY) {
                        error = ENOTCONN;
                        break;
                }
                s = splnet();
                in_pcbdisconnect(inp);
                inp->inp_laddr.s_addr = INADDR_ANY;
                splx(s);
                so->so_state &= ~SS_ISCONNECTED;                /* XXX */
                break;

        case PRU_SHUTDOWN:
                socantsendmore(so);
                break;

        case PRU_SEND:
                return (udp_output(inp, m, addr, control));

        case PRU_ABORT:
                soisdisconnected(so);
                udp_detach(inp);
                break;

        case PRU_SOCKADDR:
                in_setsockaddr(inp, addr);
                break;

        case PRU_PEERADDR:
                in_setpeeraddr(inp, addr);
                break;

        case PRU_SENSE:
                /*
                 * stat: don't bother with a blocksize.
                 */
                return (0);

        case PRU_SENDOOB:
        case PRU_FASTTIMO:
        case PRU_SLOWTIMO:
        case PRU_PROTORCV:
        case PRU_PROTOSEND:
                error =  EOPNOTSUPP;
                break;

        case PRU_RCVD:
        case PRU_RCVOOB:
                return (EOPNOTSUPP);    /* do not free mbuf's */

        default:
                panic("udp_usrreq");
        }

release:
        if (control) {
                printf("udp control data unexpectedly retained\n");
                m_freem(control);
        }
        if (m)
                m_freem(m);
        return (error);
}

static void
udp_detach(inp)
        struct inpcb *inp;
{
        int s = splnet();

        in_pcbdetach(inp);
        splx(s);
}

#ifdef ENABLE_SYSCTL
/*
 * Sysctl for udp variables.
 */
int
udp_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
        int *name;
        u_int namelen;
        void *oldp;
        size_t *oldlenp;
        void *newp;
        size_t newlen;
{
        /* All sysctl names at this level are terminal. */
        if (namelen != 1)
                return (ENOTDIR);

        switch (name[0]) {
        case UDPCTL_CHECKSUM:
                return (sysctl_int(oldp, oldlenp, newp, newlen, &udpcksum));
        case UDPCTL_STATS:
                return (sysctl_rdstruct(oldp, oldlenp, newp, &udpstat,
                                        sizeof udpstat));
        case UDPCTL_MAXDGRAM:
                return (sysctl_int(oldp, oldlenp, newp, newlen,
                                   (int *)&udp_sendspace)); /* XXX */
        case UDPCTL_RECVSPACE:
                return (sysctl_int(oldp, oldlenp, newp, newlen,
                                   (int *)&udp_recvspace)); /* XXX */
        default:
                return (ENOPROTOOPT);
        }
        /* NOTREACHED */
}
#endif