bug fixes from elz and utcsrgv!thomson

[unix-history] / usr / src / sys / netinet / in_pcb.c

diff --git a/usr/src/sys/netinet/in_pcb.c b/usr/src/sys/netinet/in_pcb.c
index 87f6979..ad13011 100644 (file)
--- a/usr/src/sys/netinet/in_pcb.c
+++ b/usr/src/sys/netinet/in_pcb.c
@@ -1,4 +1,4 @@
-/* in_pcb.c 4.8 81/11/21 */
+/*     in_pcb.c        4.24    82/03/30        */

 
 #include "../h/param.h"
 #include "../h/systm.h"
 
 #include "../h/param.h"
 #include "../h/systm.h"


@@ -7,48 +7,95 @@
 #include "../h/mbuf.h"
 #include "../h/socket.h"
 #include "../h/socketvar.h"
 #include "../h/mbuf.h"
 #include "../h/socket.h"
 #include "../h/socketvar.h"

-#include "../net/inet.h"
-#include "../net/inet_systm.h"
+#include "../net/in.h"
+#include "../net/in_systm.h"

 #include "../net/if.h"
 #include "../net/if.h"

-#include "../net/inet_pcb.h"
+#include "../net/route.h"
+#include "../net/in_pcb.h"
+#include "../h/protosw.h"
+
+/*
+ * Routines to manage internet protocol control blocks.
+ *
+ * At PRU_ATTACH time a protocol control block is allocated in
+ * in_pcballoc() and inserted on a doubly-linked list of such blocks
+ * for the protocol.  A port address is either requested (and verified
+ * to not be in use) or assigned at this time.  We also allocate
+ * space in the socket sockbuf structures here, although this is
+ * not a clearly correct place to put this function.
+ *
+ * A connectionless protocol will have its protocol control block
+ * removed at PRU_DETACH time, when the socket will be freed (freeing
+ * the space reserved) and the block will be removed from the list of
+ * blocks for its protocol.
+ *
+ * A connection-based protocol may be connected to a remote peer at
+ * PRU_CONNECT time through the routine in_pcbconnect().  In the normal
+ * case a PRU_DISCONNECT occurs causing a in_pcbdisconnect().
+ * It is also possible that higher-level routines will opt out of the
+ * relationship with the connection before the connection shut down
+ * is complete.  This often occurs in protocols like TCP where we must
+ * hold on to the protocol control block for a unreasonably long time
+ * after the connection is used up to avoid races in later connection
+ * establishment.  To handle this we allow higher-level routines to
+ * disassociate themselves from the socket, marking it SS_USERGONE while
+ * the disconnect is in progress.  We notice that this has happened
+ * when the disconnect is complete, and perform the PRU_DETACH operation,
+ * freeing the socket.
+ *
+ * TODO:
+ *     use hashing
+ */
+struct in_addr zeroin_addr;

 
 /*
  * Allocate a protocol control block, space
  * for send and receive data, and local host information.
  * Return error.  If no error make socket point at pcb.
  */
 
 /*
  * Allocate a protocol control block, space
  * for send and receive data, and local host information.
  * Return error.  If no error make socket point at pcb.
  */

-in_pcballoc(so, head, sndcc, rcvcc, sin)
+in_pcbattach(so, head, sndcc, rcvcc, sin)

        struct socket *so;
        struct inpcb *head;
        int sndcc, rcvcc;
        struct sockaddr_in *sin;
 {
        struct mbuf *m;
        struct socket *so;
        struct inpcb *head;
        int sndcc, rcvcc;
        struct sockaddr_in *sin;
 {
        struct mbuf *m;

-       register struct inpcb *inp, *xp;
-       struct ifnet *ifp;
-       u_long lport;
+       register struct inpcb *inp;
+       u_short lport = 0;

 
 

+COUNT(IN_PCBATTACH);
+       if (ifnet == 0)
+               return (EADDRNOTAVAIL);

        if (sin) {
                if (sin->sin_family != AF_INET)
                        return (EAFNOSUPPORT);
        if (sin) {
                if (sin->sin_family != AF_INET)
                        return (EAFNOSUPPORT);

-               ifp = if_ifwithaddr(sin->sin_addr);
-               if (ifp == 0)
-                       return (EADDRNOTAVAIL);
+               if (sin->sin_addr.s_addr) {
+                       int tport = sin->sin_port;
+
+                       sin->sin_port = 0;              /* yech... */
+                       if (if_ifwithaddr((struct sockaddr *)sin) == 0)
+                               return (EADDRNOTAVAIL);
+                       sin->sin_port = tport;
+               }

                lport = sin->sin_port;
                if (lport) {
                lport = sin->sin_port;
                if (lport) {

-                       xp = head->inp_next;
-                       for (; xp != head; xp = inp->inp_next) 
-                               if (xp->inp_laddr.s_addr ==
-                                   sin->sin_addr.s_addr &&
-                                   xp->inp_lport == lport &&
-                                   xp->inp_faddr.s_addr == 0)
-                                       return (EADDRINUSE);
+                       u_short aport = lport;
+                       int wild = 0;
+#if vax
+                       aport = htons(aport);
+#endif
+                       /* GROSS */
+                       if (aport < IPPORT_RESERVED && u.u_uid != 0)
+                               return (EPERM);
+                       if ((so->so_proto->pr_flags & PR_CONNREQUIRED) == 0 ||
+                           (so->so_options & SO_ACCEPTCONN) == 0)
+                               wild = INPLOOKUP_WILDCARD;
+                       if (in_pcblookup(head,
+                           zeroin_addr, 0, sin->sin_addr, lport, wild))
+                               return (EADDRINUSE);

                }
                }

-       } else {
-               ifp = if_ifwithaddr(ifnet->if_addr);
-               lport = 0;

        }
        }

-       m = m_getclr(M_WAIT);
+       m = m_getclr(M_DONTWAIT);

        if (m == 0)
                return (ENOBUFS);
        if (sbreserve(&so->so_snd, sndcc) == 0)
        if (m == 0)
                return (ENOBUFS);
        if (sbreserve(&so->so_snd, sndcc) == 0)


@@ -56,25 +103,21 @@ in_pcballoc(so, head, sndcc, rcvcc, sin)
        if (sbreserve(&so->so_rcv, rcvcc) == 0)
                goto bad2;
        inp = mtod(m, struct inpcb *);
        if (sbreserve(&so->so_rcv, rcvcc) == 0)
                goto bad2;
        inp = mtod(m, struct inpcb *);

-       inp->inp_laddr = ifp->if_addr;
-       if (lport)
-               goto gotport;
-again:
-       if (head->inp_lport++ < 1024)
-               head->inp_lport = 1024;
-       for (xp = head->inp_next; xp != head; xp = xp->inp_next)
-               if (xp->inp_lport == head->inp_lport)
-                       goto again;
-       lport = head->inp_lport;
-gotport:
-       inp->inp_socket = so;
+       inp->inp_head = head;
+       if (sin)
+               inp->inp_laddr = sin->sin_addr;
+       if (lport == 0)
+               do {
+                       if (head->inp_lport++ < IPPORT_RESERVED)
+                               head->inp_lport = IPPORT_RESERVED;
+                       lport = htons(head->inp_lport);
+               } while (in_pcblookup(head,
+                           zeroin_addr, 0, inp->inp_laddr, lport, 0));

        inp->inp_lport = lport;
        inp->inp_lport = lport;

+       inp->inp_socket = so;

        insque(inp, head);
        so->so_pcb = (caddr_t)inp;
        insque(inp, head);
        so->so_pcb = (caddr_t)inp;

-       sin = (struct sockaddr_in *)&so->so_addr;
-       sin->sin_family = AF_INET;
-       sin->sin_addr = inp->inp_laddr;
-       sin->sin_port = inp->inp_lport;
+       in_setsockaddr(inp);

        return (0);
 bad2:
        sbrelease(&so->so_snd);
        return (0);
 bad2:
        sbrelease(&so->so_snd);


@@ -83,52 +126,131 @@ bad:
        return (ENOBUFS);
 }
 
        return (ENOBUFS);
 }
 

-in_pcbsetpeer(inp, sin)
+/*
+ * Connect from a socket to a specified address.
+ * Both address and port must be specified in argument sin.
+ * If don't have a local address for this socket yet,
+ * then pick one.
+ */
+in_pcbconnect(inp, sin)

        struct inpcb *inp;
        struct sockaddr_in *sin;
 {
        struct inpcb *inp;
        struct sockaddr_in *sin;
 {

+       struct ifnet *ifp;
+       struct sockaddr_in *ifaddr;

 
 

+COUNT(IN_PCBCONNECT);

        if (sin->sin_family != AF_INET)
                return (EAFNOSUPPORT);
        if (sin->sin_addr.s_addr == 0 || sin->sin_port == 0)
                return (EADDRNOTAVAIL);
        if (sin->sin_family != AF_INET)
                return (EAFNOSUPPORT);
        if (sin->sin_addr.s_addr == 0 || sin->sin_port == 0)
                return (EADDRNOTAVAIL);

-       /* should check not already in use... */
+       if (inp->inp_laddr.s_addr == 0) {
+               ifp = if_ifonnetof(sin->sin_addr.s_net);
+               if (ifp == 0) {
+                       ifp = if_ifwithaf(AF_INET);
+                       if (ifp == 0)
+                               return (EADDRNOTAVAIL);         /* XXX */
+               }
+               ifaddr = (struct sockaddr_in *)&ifp->if_addr;
+       }
+       if (in_pcblookup(inp->inp_head,
+           sin->sin_addr,
+           sin->sin_port,
+           inp->inp_laddr.s_addr ? inp->inp_laddr : ifaddr->sin_addr,
+           inp->inp_lport,
+           0))
+               return (EADDRINUSE);
+       if (inp->inp_laddr.s_addr == 0) {
+               struct sockaddr_in *sin2 =
+                   (struct sockaddr_in *)&inp->inp_socket->so_addr;
+
+               inp->inp_laddr = ifaddr->sin_addr;
+               sin2->sin_addr = inp->inp_laddr;
+       }

        inp->inp_faddr = sin->sin_addr;
        inp->inp_fport = sin->sin_port;
        return (0);
 }
 
        inp->inp_faddr = sin->sin_addr;
        inp->inp_fport = sin->sin_port;
        return (0);
 }
 

-in_pcbfree(inp)
+in_setsockaddr(inp)
+       struct inpcb *inp;
+{
+       register struct sockaddr_in *sin =
+           (struct sockaddr_in *)&inp->inp_socket->so_addr;
+
+       sin->sin_family = AF_INET;
+       sin->sin_addr = inp->inp_laddr;
+       sin->sin_port = inp->inp_lport;
+}
+
+in_pcbdisconnect(inp)
+       struct inpcb *inp;
+{
+
+COUNT(IN_PCBDISCONNECT);
+       inp->inp_faddr.s_addr = 0;
+       inp->inp_fport = 0;
+       if (inp->inp_socket->so_state & SS_USERGONE)
+               in_pcbdetach(inp);
+}
+
+in_pcbdetach(inp)

        struct inpcb *inp;
 {
        struct socket *so = inp->inp_socket;
 
        so->so_pcb = 0;
        sofree(so);
        struct inpcb *inp;
 {
        struct socket *so = inp->inp_socket;
 
        so->so_pcb = 0;
        sofree(so);

+       if (inp->inp_route.ro_rt)
+               rtfree(inp->inp_route.ro_rt);

        remque(inp);
        (void) m_free(dtom(inp));
 }
 
        remque(inp);
        (void) m_free(dtom(inp));
 }
 

+/*
+ * SHOULD ALLOW MATCH ON MULTI-HOMING ONLY
+ */

 struct inpcb *
 struct inpcb *

-in_pcblookup(head, faddr, fport, laddr, lport)
+in_pcblookup(head, faddr, fport, laddr, lport, flags)

        struct inpcb *head;
        struct in_addr faddr, laddr;
        u_short fport, lport;
        struct inpcb *head;
        struct in_addr faddr, laddr;
        u_short fport, lport;

+       int flags;

 {
 {

-       register struct inpcb *inp;
+       register struct inpcb *inp, *match = 0;
+       int matchwild = 3, wildcard;

 
 

-       for (inp = head->inp_next; inp != head; inp = inp->inp_next)
-               if (inp->inp_faddr.s_addr == faddr.s_addr &&
-                   inp->inp_fport == fport &&
-                   inp->inp_laddr.s_addr == laddr.s_addr &&
-                   inp->inp_lport == lport)
-                       return (inp);
-       for (inp = head->inp_next; inp != head; inp = inp->inp_next)
-               if ((inp->inp_faddr.s_addr == faddr.s_addr ||
-                    inp->inp_faddr.s_addr == 0) &&
-                   (inp->inp_fport == fport || inp->inp_fport == 0) &&
-                    inp->inp_laddr.s_addr == laddr.s_addr &&
-                   (inp->inp_lport == lport || inp->inp_lport == 0))
-                       return (inp);
-       return (0);
+       for (inp = head->inp_next; inp != head; inp = inp->inp_next) {
+               if (inp->inp_lport != lport)
+                       continue;
+               wildcard = 0;
+               if (inp->inp_laddr.s_addr != 0) {
+                       if (laddr.s_addr == 0)
+                               wildcard++;
+                       else if (inp->inp_laddr.s_addr != laddr.s_addr)
+                               continue;
+               } else {
+                       if (laddr.s_addr != 0)
+                               wildcard++;
+               }
+               if (inp->inp_faddr.s_addr != 0) {
+                       if (faddr.s_addr == 0)
+                               wildcard++;
+                       else if (inp->inp_faddr.s_addr != faddr.s_addr ||
+                           inp->inp_fport != fport)
+                               continue;
+               } else {
+                       if (faddr.s_addr != 0)
+                               wildcard++;
+               }
+               if (wildcard && (flags & INPLOOKUP_WILDCARD) == 0)
+                       continue;
+               if (wildcard < matchwild) {
+                       match = inp;
+                       matchwild = wildcard;
+                       if (matchwild == 0)
+                               break;
+               }
+       }
+       return (match);

 }
 }