projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 0939c871 | 1 | /* if_loop.c 4.5 81/12/22 */ |
| 0a486d2b BJ |
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 "../net/in.h" | |
| 12 | #include "../net/in_systm.h" | |
| 13 | #include "../net/if.h" | |
| 14 | #include "../net/ip.h" | |
| 15 | #include "../net/ip_var.h" | |
| 16 | #include "../h/mtpr.h" | |
| 17 | ||
| 0939c871 | 18 | #define LONET 127 |
| 56e0df97 | 19 | #define LOMTU (1024+512) |
| 0a486d2b BJ |
20 | |
| 21 | struct ifnet loif; | |
| 22 | int looutput(); | |
| 23 | ||
| 24 | loattach() | |
| 25 | { | |
| 26 | register struct ifnet *ifp = &loif; | |
| 27 | ||
| b454c3ea | 28 | ifp->if_name = "lo"; |
| 0a486d2b BJ |
29 | ifp->if_mtu = LOMTU; |
| 30 | ifp->if_net = LONET; | |
| b454c3ea | 31 | ifp->if_addr = if_makeaddr(ifp->if_net, 0); |
| 0a486d2b | 32 | ifp->if_output = looutput; |
| 405c9168 | 33 | if_attach(ifp); |
| 0a486d2b BJ |
34 | } |
| 35 | ||
| 36 | looutput(ifp, m0, pf) | |
| 37 | struct ifnet *ifp; | |
| 38 | struct mbuf *m0; | |
| 39 | int pf; | |
| 40 | { | |
| 41 | int s = splimp(); | |
| 42 | ||
| b454c3ea | 43 | ifp->if_opackets++; |
| 0a486d2b BJ |
44 | switch (pf) { |
| 45 | ||
| 46 | #ifdef INET | |
| 47 | case PF_INET: | |
| 48 | IF_ENQUEUE(&ipintrq, m0); | |
| 49 | setipintr(); | |
| 50 | break; | |
| 51 | #endif | |
| 52 | ||
| 53 | default: | |
| 54 | splx(s); | |
| 55 | printf("lo%d: can't encapsulate pf%d\n", ifp->if_unit, pf); | |
| 56 | m_freem(m0); | |
| 57 | return (0); | |
| 58 | } | |
| b454c3ea | 59 | ifp->if_ipackets++; |
| 0a486d2b BJ |
60 | splx(s); |
| 61 | return (1); | |
| 62 | } |