/*- * * Copyright (c) 1999-2001, Vitaly V Belekhov * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice unmodified, this list of conditions, and the following * disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * $FreeBSD$ */ #include <sys/param.h> #include <sys/systm.h> #include <sys/errno.h> #include <sys/kernel.h> #include <sys/malloc.h> #include <sys/mbuf.h> #include <sys/errno.h> #include <sys/sockio.h> #include <sys/socket.h> #include <sys/syslog.h> #include <net/if.h> #include <net/if_dl.h> #include <net/if_types.h> #include <net/netisr.h> #include <netinet/in.h> #include <netinet/if_ether.h> #include <netgraph/ng_message.h> #include <netgraph/netgraph.h> #include <netgraph/ng_parse.h> #include <netgraph/ng_eiface.h> #include <net/bpf.h> #include <net/ethernet.h> #include <net/if_arp.h> static const struct ng_parse_struct_field ng_eiface_par_fields[] = NG_EIFACE_PAR_FIELDS; static const struct ng_parse_type ng_eiface_par_type = { &ng_parse_struct_type, &ng_eiface_par_fields }; static const struct ng_cmdlist ng_eiface_cmdlist[] = { { NGM_EIFACE_COOKIE, NGM_EIFACE_SET, "set", &ng_eiface_par_type, NULL }, { 0 } }; /* Node private data */ struct ng_eiface_private { struct ifnet *ifp; /* This interface */ int unit; /* Interface unit number */ struct arpcom arpcom; /* per-interface network data */ node_p node; /* Our netgraph node */ hook_p ether; /* Hook for ethernet stream */ }; typedef struct ng_eiface_private *priv_p; /* Interface methods */ static void ng_eiface_init(void *xsc); static void ng_eiface_start(struct ifnet *ifp); static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); #ifdef DEBUG static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); #endif /* Netgraph methods */ static ng_constructor_t ng_eiface_constructor; static ng_rcvmsg_t ng_eiface_rcvmsg; static ng_shutdown_t ng_eiface_rmnode; static ng_newhook_t ng_eiface_newhook; static ng_rcvdata_t ng_eiface_rcvdata; static ng_connect_t ng_eiface_connect; static ng_disconnect_t ng_eiface_disconnect; /* Node type descriptor */ static struct ng_type typestruct = { NG_ABI_VERSION, NG_EIFACE_NODE_TYPE, NULL, ng_eiface_constructor, ng_eiface_rcvmsg, ng_eiface_rmnode, ng_eiface_newhook, NULL, ng_eiface_connect, ng_eiface_rcvdata, ng_eiface_disconnect, ng_eiface_cmdlist }; NETGRAPH_INIT(eiface, &typestruct); static char ng_eiface_ifname[] = NG_EIFACE_EIFACE_NAME; /* We keep a bitmap indicating which unit numbers are free. One means the unit number is free, zero means it's taken. */ static int *ng_eiface_units = NULL; static int ng_eiface_units_len = 0; static int ng_units_in_use = 0; #define UNITS_BITSPERWORD (sizeof(*ng_eiface_units) * NBBY) /************************************************************************ HELPER STUFF ************************************************************************/ /* * Find the first free unit number for a new interface. * Increase the size of the unit bitmap as necessary. */ static __inline__ int ng_eiface_get_unit(int *unit) { int index, bit; for (index = 0; index < ng_eiface_units_len && ng_eiface_units[index] == 0; index++); if (index == ng_eiface_units_len) { /* extend array */ int i, *newarray, newlen; newlen = (2 * ng_eiface_units_len) + 4; MALLOC(newarray, int *, newlen * sizeof(*ng_eiface_units), M_NETGRAPH, M_NOWAIT); if (newarray == NULL) return (ENOMEM); bcopy(ng_eiface_units, newarray, ng_eiface_units_len * sizeof(*ng_eiface_units)); for (i = ng_eiface_units_len; i < newlen; i++) newarray[i] = ~0; if (ng_eiface_units != NULL) FREE(ng_eiface_units, M_NETGRAPH); ng_eiface_units = newarray; ng_eiface_units_len = newlen; } bit = ffs(ng_eiface_units[index]) - 1; KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, ("%s: word=%d bit=%d", __func__, ng_eiface_units[index], bit)); ng_eiface_units[index] &= ~(1 << bit); *unit = (index * UNITS_BITSPERWORD) + bit; ng_units_in_use++; return (0); } /* * Free a no longer needed unit number. */ static __inline__ void ng_eiface_free_unit(int unit) { int index, bit; index = unit / UNITS_BITSPERWORD; bit = unit % UNITS_BITSPERWORD; KASSERT(index < ng_eiface_units_len, ("%s: unit=%d len=%d", __func__, unit, ng_eiface_units_len)); KASSERT((ng_eiface_units[index] & (1 << bit)) == 0, ("%s: unit=%d is free", __func__, unit)); ng_eiface_units[index] |= (1 << bit); /* * XXX We could think about reducing the size of ng_eiface_units[] * XXX here if the last portion is all ones * XXX At least free it if no more units. * Needed if we are to eventually be able to unload. */ ng_units_in_use--; if (ng_units_in_use == 0) { /* XXX make SMP safe */ FREE(ng_eiface_units, M_NETGRAPH); ng_eiface_units_len = 0; ng_eiface_units = NULL; } } /************************************************************************ INTERFACE STUFF ************************************************************************/ /* * Process an ioctl for the virtual interface */ static int ng_eiface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) { struct ifreq *const ifr = (struct ifreq *)data; int s, error = 0; #ifdef DEBUG ng_eiface_print_ioctl(ifp, command, data); #endif s = splimp(); switch (command) { /* These two are mostly handled at a higher layer */ case SIOCSIFADDR: error = ether_ioctl(ifp, command, data); break; case SIOCGIFADDR: break; /* Set flags */ case SIOCSIFFLAGS: /* * If the interface is marked up and stopped, then * start it. If it is marked down and running, * then stop it. */ if (ifr->ifr_flags & IFF_UP) { if (!(ifp->if_flags & IFF_RUNNING)) { ifp->if_flags &= ~(IFF_OACTIVE); ifp->if_flags |= IFF_RUNNING; } } else { if (ifp->if_flags & IFF_RUNNING) ifp->if_flags &= ~(IFF_RUNNING | IFF_OACTIVE); } break; /* Set the interface MTU */ case SIOCSIFMTU: if (ifr->ifr_mtu > NG_EIFACE_MTU_MAX || ifr->ifr_mtu < NG_EIFACE_MTU_MIN) error = EINVAL; else ifp->if_mtu = ifr->ifr_mtu; break; /* Stuff that's not supported */ case SIOCADDMULTI: case SIOCDELMULTI: error = 0; break; case SIOCSIFPHYS: error = EOPNOTSUPP; break; default: error = EINVAL; break; } (void)splx(s); return (error); } static void ng_eiface_init(void *xsc) { priv_p sc = xsc; struct ifnet *ifp = sc->ifp; int s; s = splimp(); ifp->if_flags |= IFF_RUNNING; ifp->if_flags &= ~IFF_OACTIVE; splx(s); } /* * We simply relay the packet to the ether hook, if it is connected. * We have been throughthe netgraph locking an are guaranteed to * be the only code running in this node at this time. */ static void ng_eiface_start2(node_p node, hook_p hook, void *arg1, int arg2) { struct ifnet *ifp = arg1; const priv_p priv = (priv_p) ifp->if_softc; int len, error = 0; struct mbuf *m; /* Check interface flags */ if ((ifp->if_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) return; /* Don't do anything if output is active */ if (ifp->if_flags & IFF_OACTIVE) return; ifp->if_flags |= IFF_OACTIVE; /* * Grab a packet to transmit. */ IF_DEQUEUE(&ifp->if_snd, m); /* If there's nothing to send, return. */ if (m == NULL) { ifp->if_flags &= ~IFF_OACTIVE; return; } /* Berkeley packet filter * Pass packet to bpf if there is a listener. * XXX is this safe? locking? */ BPF_MTAP(ifp, m); /* Copy length before the mbuf gets invalidated */ len = m->m_pkthdr.len; /* * Send packet; if hook is not connected, mbuf will get * freed. */ NG_SEND_DATA_ONLY(error, priv->ether, m); /* Update stats */ if (error == 0) { ifp->if_obytes += len; ifp->if_opackets++; } ifp->if_flags &= ~IFF_OACTIVE; return; } /* * This routine is called to deliver a packet out the interface. * We simply queue the netgraph version to be called when netgraph locking * allows it to happen. * Until we know what the rest of the networking code is doing for * locking, we don't know how we will interact with it. * Take comfort from the fact that the ifnet struct is part of our * private info and can't go away while we are queued. * [Though we don't know it is still there now....] * it is possible we don't gain anything from this because * we would like to get the mbuf and queue it as data * somehow, but we can't and if we did would we solve anything? */ static void ng_eiface_start(struct ifnet *ifp) { const priv_p priv = (priv_p) ifp->if_softc; ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0); } #ifdef DEBUG /* * Display an ioctl to the virtual interface */ static void ng_eiface_print_ioctl(struct ifnet *ifp, int command, caddr_t data){ char *str; switch (command & IOC_DIRMASK) { case IOC_VOID: str = "IO"; break; case IOC_OUT: str = "IOR"; break; case IOC_IN: str = "IOW"; break; case IOC_INOUT: str = "IORW"; break; default: str = "IO??"; } log(LOG_DEBUG, "%s%d: %s('%c', %d, char[%d])\n", ifp->if_name, ifp->if_unit, str, IOCGROUP(command), command & 0xff, IOCPARM_LEN(command)); } #endif /* DEBUG */ /************************************************************************ NETGRAPH NODE STUFF ************************************************************************/ /* * Constructor for a node */ static int ng_eiface_constructor(node_p node) { struct ifnet *ifp; priv_p priv; int error = 0; /* Allocate node and interface private structures */ MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, 0); if (priv == NULL) { return (ENOMEM); } bzero(priv, sizeof(*priv)); ifp = &(priv->arpcom.ac_if); /* Link them together */ ifp->if_softc = priv; priv->ifp = ifp; /* Get an interface unit number */ if ((error = ng_eiface_get_unit(&priv->unit)) != 0) { FREE(priv, M_NETGRAPH); return (error); } /* Link together node and private info */ NG_NODE_SET_PRIVATE(node, priv); priv->node = node; /* Initialize interface structure */ ifp->if_name = ng_eiface_ifname; ifp->if_unit = priv->unit; ifp->if_init = ng_eiface_init; ifp->if_output = ether_output; ifp->if_start = ng_eiface_start; ifp->if_ioctl = ng_eiface_ioctl; ifp->if_watchdog = NULL; ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST); /* * Give this node name * bzero(ifname, sizeof(ifname)); * sprintf(ifname, "if%s%d", ifp->if_name, ifp->if_unit); (void) * ng_name_node(node, ifname); */ /* Attach the interface */ ether_ifattach(ifp, priv->arpcom.ac_enaddr); /* Done */ return (0); } /* * Give our ok for a hook to be added */ static int ng_eiface_newhook(node_p node, hook_p hook, const char *name) { priv_p priv = NG_NODE_PRIVATE(node); if (strcmp(name, NG_EIFACE_HOOK_ETHER)) return (EPFNOSUPPORT); if (priv->ether != NULL) return (EISCONN); priv->ether = hook; NG_HOOK_SET_PRIVATE(hook, &priv->ether); return (0); } /* * Receive a control message */ static int ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook) { priv_p priv = NG_NODE_PRIVATE(node); struct ifnet *const ifp = priv->ifp; struct ng_mesg *resp = NULL; int error = 0; struct ng_mesg *msg; NGI_GET_MSG(item, msg); switch (msg->header.typecookie) { case NGM_EIFACE_COOKIE: switch (msg->header.cmd) { case NGM_EIFACE_SET: { struct ng_eiface_par *eaddr; struct ifaddr *ifa; struct sockaddr_dl *sdl; if (msg->header.arglen != sizeof(struct ng_eiface_par)){ error = EINVAL; break; } eaddr = (struct ng_eiface_par *)(msg->data); priv->arpcom.ac_enaddr[0] = eaddr->oct0; priv->arpcom.ac_enaddr[1] = eaddr->oct1; priv->arpcom.ac_enaddr[2] = eaddr->oct2; priv->arpcom.ac_enaddr[3] = eaddr->oct3; priv->arpcom.ac_enaddr[4] = eaddr->oct4; priv->arpcom.ac_enaddr[5] = eaddr->oct5; /* And put it in the ifaddr list */ #define IFP2AC(IFP) ((struct arpcom *)IFP) TAILQ_FOREACH(ifa, &(ifp->if_addrhead), ifa_link) { sdl = (struct sockaddr_dl *)ifa->ifa_addr; if (sdl->sdl_type == IFT_ETHER) { bcopy((IFP2AC(ifp))->ac_enaddr, LLADDR(sdl), ifp->if_addrlen); break; } } break; } case NGM_EIFACE_GET_IFNAME: { struct ng_eiface_ifname *arg; NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); if (resp == NULL) { error = ENOMEM; break; } arg = (struct ng_eiface_ifname *)resp->data; sprintf(arg->ngif_name, "%s%d", ifp->if_name, ifp->if_unit); break; } case NGM_EIFACE_GET_IFADDRS: { struct ifaddr *ifa; caddr_t ptr; int buflen; #define SA_SIZE(s) ((s)->sa_len<sizeof(*(s))? sizeof(*(s)):(s)->sa_len) /* Determine size of response and allocate it */ buflen = 0; TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) buflen += SA_SIZE(ifa->ifa_addr); NG_MKRESPONSE(resp, msg, buflen, M_NOWAIT); if (resp == NULL) { error = ENOMEM; break; } /* Add addresses */ ptr = resp->data; TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { const int len = SA_SIZE(ifa->ifa_addr); if (buflen < len) { log(LOG_ERR, "%s%d: len changed?\n", ifp->if_name, ifp->if_unit); break; } bcopy(ifa->ifa_addr, ptr, len); ptr += len; buflen -= len; } break; #undef SA_SIZE } default: error = EINVAL; break; } /* end of inner switch() */ break; default: error = EINVAL; break; } NG_RESPOND_MSG(error, node, item, resp); NG_FREE_MSG(msg); return (error); } /* * Recive data from a hook. Pass the packet to the ether_input routine. */ static int ng_eiface_rcvdata(hook_p hook, item_p item) { priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); struct ifnet *const ifp = priv->ifp; struct mbuf *m; NGI_GET_M(item, m); /* Meta-data ends its life here... */ NG_FREE_ITEM(item); if (m == NULL) { printf("ng_eiface: mbuf is null.\n"); return (EINVAL); } if (!(ifp->if_flags & IFF_UP)) { return (ENETDOWN); } /* Note receiving interface */ m->m_pkthdr.rcvif = ifp; /* Update interface stats */ ifp->if_ipackets++; (*ifp->if_input)(ifp, m); /* Done */ return (0); } /* * the node. */ static int ng_eiface_rmnode(node_p node) { priv_p priv = NG_NODE_PRIVATE(node); struct ifnet *const ifp = priv->ifp; ether_ifdetach(ifp); ng_eiface_free_unit(priv->unit); FREE(priv, M_NETGRAPH); NG_NODE_SET_PRIVATE(node, NULL); NG_NODE_UNREF(node); return (0); } /* * This is called once we've already connected a new hook to the other node. * It gives us a chance to balk at the last minute. */ static int ng_eiface_connect(hook_p hook) { /* be really amiable and just say "YUP that's OK by me! " */ return (0); } /* * Hook disconnection */ static int ng_eiface_disconnect(hook_p hook) { priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); priv->ether = NULL; return (0); }