Return to if_loop.c CVS log

Up to [CSRG BSD Unix] / 42BSD / sys / netinet

Annotation of 42BSD/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: #ifdef vax
        !            24: #include "../vax/mtpr.h"
        !            25: #endif
        !            26: 
        !            27: #define        LONET   127
        !            28: #define        LOHOST  1                       /* can't be 0, that's broadcast */
        !            29: #define        LOMTU   (1024+512)
        !            30: 
        !            31: struct ifnet loif;
        !            32: int    looutput(), loioctl();
        !            33: 
        !            34: loattach()
        !            35: {
        !            36:        register struct ifnet *ifp = &loif;
        !            37:        register struct sockaddr_in *sin;
        !            38: 
        !            39:        ifp->if_name = "lo";
        !            40:        ifp->if_mtu = LOMTU;
        !            41:        ifp->if_net = LONET;
        !            42:        ifp->if_host[0] = LOHOST;
        !            43:        sin = (struct sockaddr_in *)&ifp->if_addr;
        !            44:        sin->sin_family = AF_INET;
        !            45:        sin->sin_addr = if_makeaddr(LONET, LOHOST);
        !            46:        ifp->if_flags = IFF_UP | IFF_RUNNING;
        !            47:        ifp->if_ioctl = loioctl;
        !            48:        ifp->if_output = looutput;
        !            49:        if_attach(ifp);
        !            50:        if_rtinit(ifp, RTF_UP);
        !            51: }
        !            52: 
        !            53: looutput(ifp, m0, dst)
        !            54:        struct ifnet *ifp;
        !            55:        struct mbuf *m0;
        !            56:        struct sockaddr *dst;
        !            57: {
        !            58:        int s = splimp();
        !            59:        register struct ifqueue *ifq;
        !            60: 
        !            61:        ifp->if_opackets++;
        !            62:        switch (dst->sa_family) {
        !            63: 
        !            64: #ifdef INET
        !            65:        case AF_INET:
        !            66:                ifq = &ipintrq;
        !            67:                if (IF_QFULL(ifq)) {
        !            68:                        IF_DROP(ifq);
        !            69:                        m_freem(m0);
        !            70:                        splx(s);
        !            71:                        return (ENOBUFS);
        !            72:                }
        !            73:                IF_ENQUEUE(ifq, m0);
        !            74:                schednetisr(NETISR_IP);
        !            75:                break;
        !            76: #endif
        !            77:        default:
        !            78:                splx(s);
        !            79:                printf("lo%d: can't handle af%d\n", ifp->if_unit,
        !            80:                        dst->sa_family);
        !            81:                m_freem(m0);
        !            82:                return (EAFNOSUPPORT);
        !            83:        }
        !            84:        ifp->if_ipackets++;
        !            85:        splx(s);
        !            86:        return (0);
        !            87: }
        !            88: 
        !            89: /*
        !            90:  * Process an ioctl request.
        !            91:  */
        !            92: loioctl(ifp, cmd, data)
        !            93:        register struct ifnet *ifp;
        !            94:        int cmd;
        !            95:        caddr_t data;
        !            96: {
        !            97:        struct ifreq *ifr = (struct ifreq *)data;
        !            98:        struct sockaddr_in *sin;
        !            99:        int s = splimp(), error = 0;
        !           100: 
        !           101:        switch (cmd) {
        !           102: 
        !           103:        case SIOCSIFADDR:
        !           104:                if (ifp->if_flags & IFF_RUNNING)
        !           105:                        if_rtinit(ifp, -1);     /* delete previous route */
        !           106:                ifp->if_addr = ifr->ifr_addr;
        !           107:                sin = (struct sockaddr_in *)&ifp->if_addr;
        !           108:                ifp->if_net = in_netof(sin->sin_addr);
        !           109:                ifp->if_host[0] = in_lnaof(sin->sin_addr);
        !           110:                if_rtinit(ifp, RTF_UP);
        !           111:                break;
        !           112: 
        !           113:        default:
        !           114:                error = EINVAL;
        !           115:        }
        !           116:        splx(s);
        !           117:        return (error);
        !           118: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.