The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/netns/ns_pcb.c

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    1 /*      $NetBSD: ns_pcb.c,v 1.23 2005/02/26 22:39:50 perry Exp $        */
    2 
    3 /*
    4  * Copyright (c) 1984, 1985, 1986, 1987, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)ns_pcb.c    8.1 (Berkeley) 6/10/93
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __KERNEL_RCSID(0, "$NetBSD: ns_pcb.c,v 1.23 2005/02/26 22:39:50 perry Exp $");
   36 
   37 #include <sys/param.h>
   38 #include <sys/systm.h>
   39 #include <sys/mbuf.h>
   40 #include <sys/errno.h>
   41 #include <sys/socket.h>
   42 #include <sys/socketvar.h>
   43 #include <sys/protosw.h>
   44 #include <sys/proc.h>
   45 
   46 #include <net/if.h>
   47 #include <net/route.h>
   48 
   49 #include <netns/ns.h>
   50 #include <netns/ns_if.h>
   51 #include <netns/ns_pcb.h>
   52 #include <netns/ns_var.h>
   53 
   54 static const struct     ns_addr zerons_addr;
   55 
   56 int
   57 ns_pcballoc(struct socket *so, struct nspcb *head)
   58 {
   59         struct nspcb *nsp;
   60 
   61         nsp = malloc(sizeof(*nsp), M_PCB, M_NOWAIT|M_ZERO);
   62         if (nsp == 0)
   63                 return (ENOBUFS);
   64         nsp->nsp_socket = so;
   65         insque(nsp, head);
   66         so->so_pcb = nsp;
   67         return (0);
   68 }
   69 
   70 int
   71 ns_pcbbind(struct nspcb *nsp, struct mbuf *nam, struct proc *p)
   72 {
   73         struct sockaddr_ns *sns;
   74         u_int16_t lport = 0;
   75 
   76         if (nsp->nsp_lport || !ns_nullhost(nsp->nsp_laddr))
   77                 return (EINVAL);
   78         if (nam == 0)
   79                 goto noname;
   80         sns = mtod(nam, struct sockaddr_ns *);
   81         if (nam->m_len != sizeof (*sns))
   82                 return (EINVAL);
   83         if (!ns_nullhost(sns->sns_addr)) {
   84                 int tport = sns->sns_port;
   85 
   86                 sns->sns_port = 0;              /* yech... */
   87                 if (ifa_ifwithaddr(snstosa(sns)) == 0)
   88                         return (EADDRNOTAVAIL);
   89                 sns->sns_port = tport;
   90         }
   91         lport = sns->sns_port;
   92         if (lport) {
   93 
   94                 if (ntohs(lport) < NSPORT_RESERVED &&
   95                     (p == 0 || suser(p->p_ucred, &p->p_acflag)))
   96                         return (EACCES);
   97                 if (ns_pcblookup(&zerons_addr, lport, 0))
   98                         return (EADDRINUSE);
   99         }
  100         nsp->nsp_laddr = sns->sns_addr;
  101 noname:
  102         if (lport == 0)
  103                 do {
  104                         if (nspcb.nsp_lport++ < NSPORT_RESERVED)
  105                                 nspcb.nsp_lport = NSPORT_RESERVED;
  106                         lport = htons(nspcb.nsp_lport);
  107                 } while (ns_pcblookup(&zerons_addr, lport, 0));
  108         nsp->nsp_lport = lport;
  109         return (0);
  110 }
  111 
  112 /*
  113  * Connect from a socket to a specified address.
  114  * Both address and port must be specified in argument sns.
  115  * If don't have a local address for this socket yet,
  116  * then pick one.
  117  */
  118 int
  119 ns_pcbconnect(struct nspcb *nsp, struct mbuf *nam)
  120 {
  121         struct ns_ifaddr *ia;
  122         struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
  123         struct ns_addr *dst;
  124         struct route *ro;
  125         struct ifnet *ifp;
  126 
  127         if (nam->m_len != sizeof (*sns))
  128                 return (EINVAL);
  129         if (sns->sns_family != AF_NS)
  130                 return (EAFNOSUPPORT);
  131         if (sns->sns_port==0 || ns_nullhost(sns->sns_addr))
  132                 return (EADDRNOTAVAIL);
  133         /*
  134          * If we haven't bound which network number to use as ours,
  135          * we will use the number of the outgoing interface.
  136          * This depends on having done a routing lookup, which
  137          * we will probably have to do anyway, so we might
  138          * as well do it now.  On the other hand if we are
  139          * sending to multiple destinations we may have already
  140          * done the lookup, so see if we can use the route
  141          * from before.  In any case, we only
  142          * chose a port number once, even if sending to multiple
  143          * destinations.
  144          */
  145         ro = &nsp->nsp_route;
  146         dst = &satons_addr(ro->ro_dst);
  147         if (nsp->nsp_socket->so_options & SO_DONTROUTE)
  148                 goto flush;
  149         if (!ns_neteq(nsp->nsp_lastdst, sns->sns_addr))
  150                 goto flush;
  151         if (!ns_hosteq(nsp->nsp_lastdst, sns->sns_addr)) {
  152                 if (ro->ro_rt && ! (ro->ro_rt->rt_flags & RTF_HOST)) {
  153                         /* can patch route to avoid rtalloc */
  154                         *dst = sns->sns_addr;
  155                 } else {
  156         flush:
  157                         if (ro->ro_rt)
  158                                 RTFREE(ro->ro_rt);
  159                         ro->ro_rt = (struct rtentry *)0;
  160                         nsp->nsp_laddr.x_net = ns_zeronet;
  161                 }
  162         }/* else cached route is ok; do nothing */
  163         nsp->nsp_lastdst = sns->sns_addr;
  164         if ((nsp->nsp_socket->so_options & SO_DONTROUTE) == 0 && /*XXX*/
  165             (ro->ro_rt == (struct rtentry *)0 ||
  166              ro->ro_rt->rt_ifp == (struct ifnet *)0)) {
  167                     /* No route yet, so try to acquire one */
  168                     ro->ro_dst.sa_family = AF_NS;
  169                     ro->ro_dst.sa_len = sizeof(ro->ro_dst);
  170                     *dst = sns->sns_addr;
  171                     dst->x_port = 0;
  172                     rtalloc(ro);
  173         }
  174         if (ns_neteqnn(nsp->nsp_laddr.x_net, ns_zeronet)) {
  175                 /*
  176                  * If route is known or can be allocated now,
  177                  * our src addr is taken from the i/f, else punt.
  178                  */
  179 
  180                 ia = 0;
  181                 /*
  182                  * If we found a route, use the address
  183                  * corresponding to the outgoing interface
  184                  */
  185                 if (ro->ro_rt && (ifp = ro->ro_rt->rt_ifp)) {
  186                         for (ia = ns_ifaddr.tqh_first; ia != 0;
  187                             ia = ia->ia_list.tqe_next) {
  188                                 if (ia->ia_ifp == ifp)
  189                                         break;
  190                         }
  191                 }
  192                 if (ia == 0) {
  193                         u_int16_t fport = sns->sns_addr.x_port;
  194                         sns->sns_addr.x_port = 0;
  195                         ia = (struct ns_ifaddr *)
  196                                 ifa_ifwithdstaddr(snstosa(sns));
  197                         sns->sns_addr.x_port = fport;
  198                         if (ia == 0)
  199                                 ia = ns_iaonnetof(&sns->sns_addr);
  200                         if (ia == 0)
  201                                 ia = ns_ifaddr.tqh_first;
  202                         if (ia == 0)
  203                                 return (EADDRNOTAVAIL);
  204                 }
  205                 nsp->nsp_laddr.x_net = satons_addr(ia->ia_addr).x_net;
  206         }
  207         if (ns_pcblookup(&sns->sns_addr, nsp->nsp_lport, 0))
  208                 return (EADDRINUSE);
  209         if (ns_nullhost(nsp->nsp_laddr)) {
  210                 if (nsp->nsp_lport == 0)
  211                         (void) ns_pcbbind(nsp, (struct mbuf *)0,
  212                             (struct proc *)0);
  213                 nsp->nsp_laddr.x_host = ns_thishost;
  214         }
  215         nsp->nsp_faddr = sns->sns_addr;
  216         /* Includes nsp->nsp_fport = sns->sns_port; */
  217         return (0);
  218 }
  219 
  220 void
  221 ns_pcbdisconnect(struct nspcb *nsp)
  222 {
  223 
  224         nsp->nsp_faddr = zerons_addr;
  225         if (nsp->nsp_socket->so_state & SS_NOFDREF)
  226                 ns_pcbdetach(nsp);
  227 }
  228 
  229 void
  230 ns_pcbdetach(struct nspcb *nsp)
  231 {
  232         struct socket *so = nsp->nsp_socket;
  233 
  234         so->so_pcb = 0;
  235         sofree(so);
  236         if (nsp->nsp_route.ro_rt)
  237                 rtfree(nsp->nsp_route.ro_rt);
  238         remque(nsp);
  239         free(nsp, M_PCB);
  240 }
  241 
  242 void
  243 ns_setsockaddr(struct nspcb *nsp, struct mbuf *nam)
  244 {
  245         struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
  246 
  247         nam->m_len = sizeof (*sns);
  248         sns = mtod(nam, struct sockaddr_ns *);
  249         bzero((caddr_t)sns, sizeof (*sns));
  250         sns->sns_len = sizeof(*sns);
  251         sns->sns_family = AF_NS;
  252         sns->sns_addr = nsp->nsp_laddr;
  253 }
  254 
  255 void
  256 ns_setpeeraddr(struct nspcb *nsp, struct mbuf *nam)
  257 {
  258         struct sockaddr_ns *sns = mtod(nam, struct sockaddr_ns *);
  259 
  260         nam->m_len = sizeof (*sns);
  261         sns = mtod(nam, struct sockaddr_ns *);
  262         bzero((caddr_t)sns, sizeof (*sns));
  263         sns->sns_len = sizeof(*sns);
  264         sns->sns_family = AF_NS;
  265         sns->sns_addr  = nsp->nsp_faddr;
  266 }
  267 
  268 /*
  269  * Pass some notification to all connections of a protocol
  270  * associated with address dst.  Call the
  271  * protocol specific routine to handle each connection.
  272  * Also pass an extra parameter via the nspcb. (which may in fact
  273  * be a parameter list!)
  274  */
  275 void
  276 ns_pcbnotify(struct ns_addr *dst, int errno,
  277         void (*notify)(struct nspcb *), long param)
  278 {
  279         struct nspcb *nsp, *oinp;
  280         int s = splnet();
  281 
  282         for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb);) {
  283                 if (!ns_hosteq(*dst,nsp->nsp_faddr)) {
  284         next:
  285                         nsp = nsp->nsp_next;
  286                         continue;
  287                 }
  288                 if (nsp->nsp_socket == 0)
  289                         goto next;
  290                 if (errno)
  291                         nsp->nsp_socket->so_error = errno;
  292                 oinp = nsp;
  293                 nsp = nsp->nsp_next;
  294                 oinp->nsp_notify_param = param;
  295                 (*notify)(oinp);
  296         }
  297         splx(s);
  298 }
  299 
  300 /*
  301  * After a routing change, flush old routing
  302  * and allocate a (hopefully) better one.
  303  */
  304 void
  305 ns_rtchange(struct nspcb *nsp)
  306 {
  307         if (nsp->nsp_route.ro_rt) {
  308                 rtfree(nsp->nsp_route.ro_rt);
  309                 nsp->nsp_route.ro_rt = 0;
  310                 /*
  311                  * A new route can be allocated the next time
  312                  * output is attempted.
  313                  */
  314         }
  315         /* SHOULD NOTIFY HIGHER-LEVEL PROTOCOLS */
  316 }
  317 
  318 struct nspcb *
  319 ns_pcblookup(const struct ns_addr *faddr, u_int16_t lport, int wildp)
  320 {
  321         struct nspcb *nsp, *match = 0;
  322         int matchwild = 3, wildcard;
  323         u_int16_t fport;
  324 
  325         fport = faddr->x_port;
  326         for (nsp = (&nspcb)->nsp_next; nsp != (&nspcb); nsp = nsp->nsp_next) {
  327                 if (nsp->nsp_lport != lport)
  328                         continue;
  329                 wildcard = 0;
  330                 if (ns_nullhost(nsp->nsp_faddr)) {
  331                         if (!ns_nullhost(*faddr))
  332                                 wildcard++;
  333                 } else {
  334                         if (ns_nullhost(*faddr))
  335                                 wildcard++;
  336                         else {
  337                                 if (!ns_hosteq(nsp->nsp_faddr, *faddr))
  338                                         continue;
  339                                 if (nsp->nsp_fport != fport) {
  340                                         if (nsp->nsp_fport != 0)
  341                                                 continue;
  342                                         else
  343                                                 wildcard++;
  344                                 }
  345                         }
  346                 }
  347                 if (wildcard && wildp==0)
  348                         continue;
  349                 if (wildcard < matchwild) {
  350                         match = nsp;
  351                         matchwild = wildcard;
  352                         if (wildcard == 0)
  353                                 break;
  354                 }
  355         }
  356         return (match);
  357 }

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