/* * ng_eiface.c * * Copyright (c) 1999-2000, 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. * * $Id: ng_eiface.c,v 1.14 2000/03/15 12:28:44 vitaly Exp $ * $FreeBSD: src/sys/netgraph/ng_eiface.c,v 1.4.2.5 2002/12/17 21:47:48 julian Exp $ * $DragonFly: src/sys/netgraph/eiface/ng_eiface.c,v 1.8 2005/06/02 22:11:45 swildner Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "ng_eiface.h" #include #include #include 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 arpcom arpcom; /* per-interface network data */ struct ifnet *ifp; /* This interface */ node_p node; /* Our netgraph node */ hook_p ether; /* Hook for ethernet stream */ struct private *next; /* When hung on the free list */ }; 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_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_rcvdata, ng_eiface_disconnect, ng_eiface_cmdlist }; NETGRAPH_INIT(eiface, &typestruct); static char ng_eiface_ifname[] = NG_EIFACE_EIFACE_NAME; static int ng_eiface_next_unit; /************************************************************************ 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 error = 0; #ifdef DEBUG ng_eiface_print_ioctl(ifp, command, data); #endif crit_enter(); 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; } crit_exit(); return (error); } static void ng_eiface_init(void *xsc) { priv_p sc = xsc; struct ifnet *ifp = sc->ifp; crit_enter(); ifp->if_flags |= IFF_RUNNING; ifp->if_flags &= ~IFF_OACTIVE; crit_exit(); } /* * This routine is called to deliver a packet out the interface. * We simply relay the packet to * the ether hook, if it is connected. */ static void ng_eiface_start(struct ifnet *ifp) { const priv_p priv = (priv_p) ifp->if_softc; meta_p meta = NULL; 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; } 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(error, priv->ether, m, meta); /* Update stats */ if (error == 0) { ifp->if_obytes += len; ifp->if_opackets++; } ifp->if_flags &= ~IFF_OACTIVE; return; } #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: %s('%c', %d, char[%d])\n", ifp->if_xname, str, IOCGROUP(command), command & 0xff, IOCPARM_LEN(command)); } #endif /* DEBUG */ /************************************************************************ NETGRAPH NODE STUFF ************************************************************************/ /* * Constructor for a node */ static int ng_eiface_constructor(node_p *nodep) { struct ifnet *ifp; node_p node; priv_p priv; int error = 0; /* Allocate node and interface private structures */ MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_WAITOK); if (priv == NULL) return (ENOMEM); bzero(priv, sizeof(*priv)); ifp = &(priv->arpcom.ac_if); /* Link them together */ ifp->if_softc = priv; priv->ifp = ifp; /* Call generic node constructor */ if ((error = ng_make_node_common(&typestruct, nodep))) { FREE(priv, M_NETGRAPH); return (error); } node = *nodep; /* Link together node and private info */ node->private = priv; priv->node = node; /* Initialize interface structure */ if_initname(ifp, ng_eiface_ifname, ng_eiface_next_unit++); ifp->if_init = ng_eiface_init; 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); TAILQ_INIT(&ifp->if_addrhead); /* Give this node name * bzero(ifname, sizeof(ifname)); sprintf(ifname, "if%s", ifp->if_xname); (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 = node->private; if (strcmp(name, NG_EIFACE_HOOK_ETHER)) return (EPFNOSUPPORT); if (priv->ether != NULL) return (EISCONN); priv->ether = hook; hook->private = &priv->ether; return (0); } /* * Receive a control message */ static int ng_eiface_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr) { const priv_p priv = node->private; struct ifnet *const ifp = priv->ifp; struct ng_mesg *resp = NULL; int error = 0; switch (msg->header.typecookie) { case NGM_EIFACE_COOKIE: switch (msg->header.cmd) { case NGM_EIFACE_SET: { struct ng_eiface_par *eaddr; 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; 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", ifp->if_xname); /* XXX: strings */ break; } case NGM_EIFACE_GET_IFADDRS: { struct ifaddr *ifa; caddr_t ptr; int buflen; #define SA_SIZE(s) ((s)->sa_lensa_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: len changed?\n", ifp->if_xname); break; } bcopy(ifa->ifa_addr, ptr, len); ptr += len; buflen -= len; } break; #undef SA_SIZE } default: error = EINVAL; break; } break; default: error = EINVAL; break; } if (rptr) *rptr = resp; else if (resp) FREE(resp, M_NETGRAPH); FREE(msg, M_NETGRAPH); return (error); } /* * Recive data from a hook. Pass the packet to the ether_input routine. */ static int ng_eiface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) { const priv_p priv = hook->node->private; struct ifnet *const ifp = priv->ifp; int error = 0; struct ether_header *eh; u_short ether_type; /* Meta-data is end its life here... */ NG_FREE_META(meta); 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++; BPF_MTAP(ifp, m); (*ifp->if_input)(ifp, m); /* Done */ return (error); } /* * Because the BSD networking code doesn't support the removal of * networking interfaces, iface nodes (once created) are persistent. * So this method breaks all connections and marks the interface * down, but does not remove the node. */ static int ng_eiface_rmnode(node_p node) { const priv_p priv = node->private; struct ifnet *const ifp = priv->ifp; ng_cutlinks(node); node->flags &= ~NG_INVALID; ifp->if_flags &= ~(IFF_UP | IFF_RUNNING | IFF_OACTIVE); 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) { const priv_p priv = hook->node->private; priv->ether = NULL; return (0); }