much more generous NFILE

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

diff --git a/usr/src/sys/netinet/ip_input.c b/usr/src/sys/netinet/ip_input.c
index 014e589..04fc07c 100644 (file)
--- a/usr/src/sys/netinet/ip_input.c
+++ b/usr/src/sys/netinet/ip_input.c
@@ -1,4 +1,4 @@
-/* ip_input.c 1.19 81/11/26 */
+/*     ip_input.c      1.38    82/03/31        */

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


@@ -15,9 +15,12 @@
 #include "../net/tcp.h"
 
 u_char ip_protox[IPPROTO_MAX];
 #include "../net/tcp.h"
 
 u_char ip_protox[IPPROTO_MAX];

+int    ipqmaxlen = IFQ_MAXLEN;
+struct ifnet *ifinet;                  /* first inet interface */

 
 /*
 
 /*

- * Ip initialization.
+ * IP initialization: fill in IP protocol switch table.
+ * All protocols not implemented in kernel go to raw IP protocol handler.

  */
 ip_init()
 {
  */
 ip_init()
 {


@@ -36,14 +39,15 @@ COUNT(IP_INIT);
                        ip_protox[pr->pr_protocol] = pr - protosw;
        ipq.next = ipq.prev = &ipq;
        ip_id = time & 0xffff;
                        ip_protox[pr->pr_protocol] = pr - protosw;
        ipq.next = ipq.prev = &ipq;
        ip_id = time & 0xffff;

+       ipintrq.ifq_maxlen = ipqmaxlen;
+       ifinet = if_ifwithaf(AF_INET);

 }
 
 u_char ipcksum = 1;
 struct ip *ip_reass();
 }
 
 u_char ipcksum = 1;
 struct ip *ip_reass();

-
-/*
- * Ip input routines.
- */
+int    ipforwarding = 1;
+int    ipprintfs = 0;
+struct sockaddr_in ipaddr = { AF_INET };

 
 /*
  * Ip input routine.  Checksum and byte swap header.  If fragmented
 
 /*
  * Ip input routine.  Checksum and byte swap header.  If fragmented


@@ -54,7 +58,7 @@ ipintr()
 {
        register struct ip *ip;
        register struct mbuf *m;
 {
        register struct ip *ip;
        register struct mbuf *m;

-       struct mbuf *m0;
+       struct mbuf *m0, *mopt;

        register int i;
        register struct ipq *fp;
        int hlen, s;
        register int i;
        register struct ipq *fp;
        int hlen, s;


@@ -70,26 +74,30 @@ next:
        splx(s);
        if (m == 0)
                return;
        splx(s);
        if (m == 0)
                return;

-       if (m->m_len < sizeof (struct ip) &&
-           m_pullup(m, sizeof (struct ip)) == 0)
-               goto bad;
+       if ((m->m_off > MMAXOFF || m->m_len < sizeof (struct ip)) &&
+           (m = m_pullup(m, sizeof (struct ip))) == 0)
+               return;

        ip = mtod(m, struct ip *);
        ip = mtod(m, struct ip *);

-       if ((hlen = ip->ip_hl << 2) > m->m_len &&
-           m_pullup(m, hlen) == 0)
-               goto bad;
+       if ((hlen = ip->ip_hl << 2) > m->m_len) {
+               if ((m = m_pullup(m, hlen)) == 0)
+                       return;
+               ip = mtod(m, struct ip *);
+       }

        if (ipcksum)
        if (ipcksum)

-               if ((ip->ip_sum = in_cksum(m, hlen)) != 0xffff) {
-                       printf("ip_sum %x\n", ip->ip_sum);
+               if (ip->ip_sum = in_cksum(m, hlen)) {
+                       printf("ip_sum %x\n", ip->ip_sum);      /* XXX */

                        ipstat.ips_badsum++;
                        goto bad;
                }
 
                        ipstat.ips_badsum++;
                        goto bad;
                }
 

+#if vax

        /*
         * Convert fields to host representation.
         */
        ip->ip_len = ntohs((u_short)ip->ip_len);
        ip->ip_id = ntohs(ip->ip_id);
        ip->ip_off = ntohs((u_short)ip->ip_off);
        /*
         * Convert fields to host representation.
         */
        ip->ip_len = ntohs((u_short)ip->ip_len);
        ip->ip_id = ntohs(ip->ip_id);
        ip->ip_off = ntohs((u_short)ip->ip_off);

+#endif

 
        /*
         * Check that the amount of data in the buffers
 
        /*
         * Check that the amount of data in the buffers


@@ -98,12 +106,17 @@ next:
         * Drop packet if shorter than we expect.
         */
        i = 0;
         * Drop packet if shorter than we expect.
         */
        i = 0;

-       for (m0 = m; m != NULL; m = m->m_next)
+       m0 = m;
+       for (; m != NULL; m = m->m_next) {
+               if (m->m_free) panic("ipinput already free");

                i += m->m_len;
                i += m->m_len;

+       }

        m = m0;
        if (i != ip->ip_len) {
        m = m0;
        if (i != ip->ip_len) {

-               if (i < ip->ip_len)
+               if (i < ip->ip_len) {
+                       ipstat.ips_tooshort++;

                        goto bad;
                        goto bad;

+               }

                m_adj(m, ip->ip_len - i);
        }
 
                m_adj(m, ip->ip_len - i);
        }
 


@@ -113,16 +126,44 @@ next:
         */
        if (hlen > sizeof (struct ip))
                ip_dooptions(ip);
         */
        if (hlen > sizeof (struct ip))
                ip_dooptions(ip);

-       if (ifnet && ip->ip_dst.s_addr != ifnet->if_addr.s_addr &&
-           if_ifwithaddr(ip->ip_dst) == 0) {
-               if (--ip->ip_ttl == 0) {
+
+       /*
+        * Fast check on the first internet
+        * interface in the list.
+        */
+       if (ifinet) {
+               struct sockaddr_in *sin;
+
+               sin = (struct sockaddr_in *)&ifinet->if_addr;
+               if (sin->sin_addr.s_addr == ip->ip_dst.s_addr)
+                       goto ours;
+               if ((ifinet->if_flags & IFF_BROADCAST) &&
+                   sin->sin_addr.s_addr == ip->ip_dst.s_addr)
+                       goto ours;
+       }
+       ipaddr.sin_addr = ip->ip_dst;
+       if (if_ifwithaddr((struct sockaddr *)&ipaddr) == 0) {
+               if (ipprintfs)
+                       printf("forward: src %x dst %x ttl %x\n", ip->ip_src,
+                               ip->ip_dst, ip->ip_ttl);
+               if (ipforwarding == 0)
+                       goto bad;
+               if (ip->ip_ttl < IPTTLDEC) {

                        icmp_error(ip, ICMP_TIMXCEED, 0);
                        goto next;
                }
                        icmp_error(ip, ICMP_TIMXCEED, 0);
                        goto next;
                }

-               ip_output(dtom(ip), (struct mbuf *)0);
+               ip->ip_ttl -= IPTTLDEC;
+               mopt = m_get(M_DONTWAIT);
+               if (mopt == 0)
+                       goto bad;
+               ip_stripoptions(ip, mopt);
+
+               /* last 0 here means no directed broadcast */
+               (void) ip_output(m0, mopt, 0, 0);

                goto next;
        }
 
                goto next;
        }
 

+ours:

        /*
         * Look for queue of fragments
         * of this datagram.
        /*
         * Look for queue of fragments
         * of this datagram.


@@ -201,7 +242,7 @@ COUNT(IP_REASS);
         * If first fragment to arrive, create a reassembly queue.
         */
        if (fp == 0) {
         * If first fragment to arrive, create a reassembly queue.
         */
        if (fp == 0) {

-               if ((t = m_get(1)) == NULL)
+               if ((t = m_get(M_WAIT)) == NULL)

                        goto dropfrag;
                t->m_off = MMINOFF;
                fp = mtod(t, struct ipq *);
                        goto dropfrag;
                t->m_off = MMINOFF;
                fp = mtod(t, struct ipq *);


@@ -212,6 +253,8 @@ COUNT(IP_REASS);
                fp->ipq_next = fp->ipq_prev = (struct ipasfrag *)fp;
                fp->ipq_src = ((struct ip *)ip)->ip_src;
                fp->ipq_dst = ((struct ip *)ip)->ip_dst;
                fp->ipq_next = fp->ipq_prev = (struct ipasfrag *)fp;
                fp->ipq_src = ((struct ip *)ip)->ip_src;
                fp->ipq_dst = ((struct ip *)ip)->ip_dst;

+               q = (struct ipasfrag *)fp;
+               goto insert;

        }
 
        /*
        }
 
        /*


@@ -245,6 +288,7 @@ COUNT(IP_REASS);
                i = (ip->ip_off + ip->ip_len) - q->ip_off;
                if (i < q->ip_len) {
                        q->ip_len -= i;
                i = (ip->ip_off + ip->ip_len) - q->ip_off;
                if (i < q->ip_len) {
                        q->ip_len -= i;

+                       q->ip_off += i;

                        m_adj(dtom(q), i);
                        break;
                }
                        m_adj(dtom(q), i);
                        break;
                }


@@ -253,6 +297,7 @@ COUNT(IP_REASS);
                ip_deq(q->ipf_prev);
        }
 
                ip_deq(q->ipf_prev);
        }
 

+insert:

        /*
         * Stick new segment in its place;
         * check for complete reassembly.
        /*
         * Stick new segment in its place;
         * check for complete reassembly.


@@ -275,8 +320,12 @@ COUNT(IP_REASS);
        t = m->m_next;
        m->m_next = 0;
        m_cat(m, t);
        t = m->m_next;
        m->m_next = 0;
        m_cat(m, t);

-       while ((q = q->ipf_next) != (struct ipasfrag *)fp)
-               m_cat(m, dtom(q));
+       q = q->ipf_next;
+       while (q != (struct ipasfrag *)fp) {
+               t = dtom(q);
+               q = q->ipf_next;
+               m_cat(m, t);
+       }

 
        /*
         * Create header for new ip packet by
 
        /*
         * Create header for new ip packet by


@@ -359,7 +408,12 @@ ip_slowtimo()
        int s = splnet();
 
 COUNT(IP_SLOWTIMO);
        int s = splnet();
 
 COUNT(IP_SLOWTIMO);

-       for (fp = ipq.next; fp != &ipq; )
+       fp = ipq.next;
+       if (fp == 0) {
+               splx(s);
+               return;
+       }
+       while (fp != &ipq)

                if (--fp->ipq_ttl == 0)
                        fp = ip_freef(fp);
                else
                if (--fp->ipq_ttl == 0)
                        fp = ip_freef(fp);
                else


@@ -422,7 +476,8 @@ COUNT(IP_DOOPTIONS);
                        if (cp[2] < 4 || cp[2] > optlen - (sizeof (long) - 1))
                                break;
                        sin = (struct in_addr *)(cp + cp[2]);
                        if (cp[2] < 4 || cp[2] > optlen - (sizeof (long) - 1))
                                break;
                        sin = (struct in_addr *)(cp + cp[2]);

-                       ifp = if_ifwithaddr(*sin);
+                       ipaddr.sin_addr = *sin;
+                       ifp = if_ifwithaddr((struct sockaddr *)&ipaddr);

                        if (ifp == 0) {
                                if (opt == IPOPT_SSRR)
                                        goto bad;
                        if (ifp == 0) {
                                if (opt == IPOPT_SSRR)
                                        goto bad;


@@ -433,7 +488,8 @@ COUNT(IP_DOOPTIONS);
                        if (cp[2] > optlen - (sizeof (long) - 1))
                                break;
                        ip->ip_dst = sin[1];
                        if (cp[2] > optlen - (sizeof (long) - 1))
                                break;
                        ip->ip_dst = sin[1];

-                       if (opt == IPOPT_SSRR && if_ifonnetof(ip->ip_dst)==0)
+                       if (opt == IPOPT_SSRR &&
+                           if_ifonnetof(ip->ip_dst.s_net) == 0)

                                goto bad;
                        break;
 
                                goto bad;
                        break;
 


@@ -455,12 +511,14 @@ COUNT(IP_DOOPTIONS);
                        case IPOPT_TS_TSANDADDR:
                                if (ipt->ipt_ptr + 8 > ipt->ipt_len)
                                        goto bad;
                        case IPOPT_TS_TSANDADDR:
                                if (ipt->ipt_ptr + 8 > ipt->ipt_len)
                                        goto bad;

-                               /* stamp with ``first'' interface address */
-                               *sin++ = ifnet->if_addr;
+                               if (ifinet == 0)
+                                       goto bad;       /* ??? */
+                               *sin++ = ((struct sockaddr_in *)&ifinet->if_addr)->sin_addr;

                                break;
 
                        case IPOPT_TS_PRESPEC:
                                break;
 
                        case IPOPT_TS_PRESPEC:

-                               if (if_ifwithaddr(*sin) == 0)
+                               ipaddr.sin_addr = *sin;
+                               if (if_ifwithaddr((struct sockaddr *)&ipaddr) == 0)

                                        continue;
                                if (ipt->ipt_ptr + 8 > ipt->ipt_len)
                                        goto bad;
                                        continue;
                                if (ipt->ipt_ptr + 8 > ipt->ipt_len)
                                        goto bad;


@@ -486,9 +544,9 @@ bad:
  * Second argument is buffer to which options
  * will be moved, and return value is their length.
  */
  * Second argument is buffer to which options
  * will be moved, and return value is their length.
  */

-ip_stripoptions(ip, cp)
+ip_stripoptions(ip, mopt)

        struct ip *ip;
        struct ip *ip;

-       char *cp;
+       struct mbuf *mopt;

 {
        register int i;
        register struct mbuf *m;
 {
        register int i;
        register struct mbuf *m;


@@ -498,9 +556,12 @@ COUNT(IP_STRIPOPTIONS);
        olen = (ip->ip_hl<<2) - sizeof (struct ip);
        m = dtom(ip);
        ip++;
        olen = (ip->ip_hl<<2) - sizeof (struct ip);
        m = dtom(ip);
        ip++;

-       if (cp)
-               bcopy((caddr_t)ip, cp, (unsigned)olen);
+       if (mopt) {
+               mopt->m_len = olen;
+               mopt->m_off = MMINOFF;
+               bcopy((caddr_t)ip, mtod(m, caddr_t), (unsigned)olen);
+       }

        i = m->m_len - (sizeof (struct ip) + olen);
        bcopy((caddr_t)ip+olen, (caddr_t)ip, (unsigned)i);
        i = m->m_len - (sizeof (struct ip) + olen);
        bcopy((caddr_t)ip+olen, (caddr_t)ip, (unsigned)i);

-       m->m_len -= i;
+       m->m_len -= olen;

 }
 }