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Annotation of cci/sys/netinet/if_loop.c, revision 1.1

1.1     ! root        1: /*     if_loop.c       6.1     83/07/29        */
        !             2: 
        !             3: /*
        !             4:  * Loopback interface driver for protocol testing and timing.
        !             5:  */
        !             6: 
        !             7: #include "../h/param.h"
        !             8: #include "../h/systm.h"
        !             9: #include "../h/mbuf.h"
        !            10: #include "../h/socket.h"
        !            11: #include "../h/errno.h"
        !            12: #include "../h/ioctl.h"
        !            13: 
        !            14: #include "../net/if.h"
        !            15: #include "../net/netisr.h"
        !            16: #include "../net/route.h"
        !            17: 
        !            18: #include "../netinet/in.h"
        !            19: #include "../netinet/in_systm.h"
        !            20: #include "../netinet/ip.h"
        !            21: #include "../netinet/ip_var.h"
        !            22: 
        !            23: #include "../machine/mtpr.h"
        !            24: 
        !            25: #define        LONET   127
        !            26: #define        LOHOST  1                       /* can't be 0, that's broadcast */
        !            27: #define        LOMTU   (1024+512)
        !            28: 
        !            29: struct ifnet loif;
        !            30: int    looutput(), loioctl();
        !            31: 
        !            32: loattach()
        !            33: {
        !            34:        register struct ifnet *ifp = &loif;
        !            35:        register struct sockaddr_in *sin;
        !            36: 
        !            37:        ifp->if_name = "lo";
        !            38:        ifp->if_mtu = LOMTU;
        !            39:        ifp->if_net = LONET;
        !            40:        ifp->if_host[0] = LOHOST;
        !            41:        sin = (struct sockaddr_in *)&ifp->if_addr;
        !            42:        sin->sin_family = AF_INET;
        !            43:        sin->sin_addr = if_makeaddr(LONET, LOHOST);
        !            44:        ifp->if_flags = IFF_UP | IFF_RUNNING;
        !            45:        ifp->if_ioctl = loioctl;
        !            46:        ifp->if_output = looutput;
        !            47:        if_attach(ifp);
        !            48:        if_rtinit(ifp, RTF_UP);
        !            49: }
        !            50: 
        !            51: looutput(ifp, m0, dst)
        !            52:        struct ifnet *ifp;
        !            53:        struct mbuf *m0;
        !            54:        struct sockaddr *dst;
        !            55: {
        !            56:        int s = splimp();
        !            57:        register struct ifqueue *ifq;
        !            58: 
        !            59:        ifp->if_opackets++;
        !            60:        switch (dst->sa_family) {
        !            61: 
        !            62: #ifdef INET
        !            63:        case AF_INET:
        !            64:                ifq = &ipintrq;
        !            65:                if (IF_QFULL(ifq)) {
        !            66:                        IF_DROP(ifq);
        !            67:                        m_freem(m0);
        !            68:                        splx(s);
        !            69:                        return (ENOBUFS);
        !            70:                }
        !            71:                IF_ENQUEUE(ifq, m0);
        !            72:                schednetisr(NETISR_IP);
        !            73:                break;
        !            74: #endif
        !            75:        default:
        !            76:                splx(s);
        !            77:                printf("lo%d: can't handle af%d\n", ifp->if_unit,
        !            78:                        dst->sa_family);
        !            79:                m_freem(m0);
        !            80:                return (EAFNOSUPPORT);
        !            81:        }
        !            82:        ifp->if_ipackets++;
        !            83:        splx(s);
        !            84:        return (0);
        !            85: }
        !            86: 
        !            87: /*
        !            88:  * Process an ioctl request.
        !            89:  */
        !            90: loioctl(ifp, cmd, data)
        !            91:        register struct ifnet *ifp;
        !            92:        int cmd;
        !            93:        caddr_t data;
        !            94: {
        !            95:        struct ifreq *ifr = (struct ifreq *)data;
        !            96:        struct sockaddr_in *sin;
        !            97:        int s = splimp(), error = 0;
        !            98: 
        !            99:        switch (cmd) {
        !           100: 
        !           101:        case SIOCSIFADDR:
        !           102:                if (ifp->if_flags & IFF_RUNNING)
        !           103:                        if_rtinit(ifp, -1);     /* delete previous route */
        !           104:                ifp->if_addr = ifr->ifr_addr;
        !           105:                sin = (struct sockaddr_in *)&ifp->if_addr;
        !           106:                ifp->if_net = in_netof(sin->sin_addr);
        !           107:                ifp->if_host[0] = in_lnaof(sin->sin_addr);
        !           108:                if_rtinit(ifp, RTF_UP);
        !           109:                break;
        !           110: 
        !           111:        default:
        !           112:                error = EINVAL;
        !           113:        }
        !           114:        splx(s);
        !           115:        return (error);
        !           116: }

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