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Annotation of xinu/sys/icmp_in.c, revision 1.1

1.1     ! root        1: /* icmp_in.c - icmp_in */
        !             2: 
        !             3: #include <conf.h>
        !             4: #include <kernel.h>
        !             5: #include <network.h>
        !             6: 
        !             7: /*------------------------------------------------------------------------
        !             8:  *  icmp_in  -  handle ICMP packet coming in from the network
        !             9:  *------------------------------------------------------------------------
        !            10:  */
        !            11: icmp_in(packet, icmpp, lim)
        !            12: struct epacket *packet;
        !            13: int    icmpp;
        !            14: int    lim;
        !            15: {
        !            16:        struct  ip      *ipptr;
        !            17:        struct  icmp    *icmpptr;
        !            18:        int     len;
        !            19: 
        !            20:        ipptr = (struct ip *)packet->ep_data;
        !            21:        icmpptr = (struct icmp *) ipptr->i_data;
        !            22:        if (!Net.mavalid || icmpptr->ic_typ != ICRQECH) {
        !            23:                freebuf(packet);
        !            24:        } else {
        !            25:                icmpptr->ic_typ = (char) ICRPECH;
        !            26:                blkcopy(ipptr->i_dest, ipptr->i_src, IPLEN);
        !            27:                len = net2hs(ipptr->i_paclen) - IPHLEN;
        !            28:                if (isodd(len)) {
        !            29:                        ipptr->i_data[len++] = NULLCH;
        !            30:                }
        !            31:                icmpptr->ic_cksum = 0;
        !            32:                icmpptr->ic_cksum = cksum(icmpptr, len>>1);
        !            33:                if (pcount(icmpp) < lim)
        !            34:                        psend(icmpp, packet);
        !            35:                else
        !            36:                        freebuf(packet);
        !            37:        }
        !            38:        return(OK);
        !            39: }

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