/*- * * 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: src/sys/netgraph/ng_eiface.c,v 1.39 2007/07/26 10:54:33 glebius 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_cmdlist ng_eiface_cmdlist[] = { { NGM_EIFACE_COOKIE, NGM_EIFACE_GET_IFNAME, "getifname", NULL, &ng_parse_string_type }, { NGM_EIFACE_COOKIE, NGM_EIFACE_SET, "set", &ng_parse_enaddr_type, NULL }, { 0 } }; /* Node private data */ struct ng_eiface_private { struct ifnet *ifp; /* per-interface network data */ int unit; /* Interface unit number */ 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, struct ifaltq_subque *); static int ng_eiface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data, struct ucred *cr); #ifdef DEBUG static void ng_eiface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); #endif /* Netgraph methods */ static int ng_eiface_mod_event(module_t, int, void *); 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_disconnect_t ng_eiface_disconnect; /* Node type descriptor */ static struct ng_type typestruct = { .version = NG_ABI_VERSION, .name = NG_EIFACE_NODE_TYPE, .mod_event = ng_eiface_mod_event, .constructor = ng_eiface_constructor, .rcvmsg = ng_eiface_rcvmsg, .shutdown = ng_eiface_rmnode, .newhook = ng_eiface_newhook, .rcvdata = ng_eiface_rcvdata, .disconnect = ng_eiface_disconnect, .cmdlist = ng_eiface_cmdlist }; NETGRAPH_INIT(eiface, &typestruct); 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 ucred *cr) { 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 (ifp->if_flags & IFF_UP) { if (!(ifp->if_flags & IFF_RUNNING)) { ifq_clr_oactive(&ifp->if_snd); ifp->if_flags |= IFF_RUNNING; } } else { if (ifp->if_flags & IFF_RUNNING) ifq_clr_oactive(&ifp->if_snd); ifp->if_flags &= ~(IFF_RUNNING); } 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; ifq_clr_oactive(&ifp->if_snd); crit_exit(); } /* * We simply relay the packet to the "ether" hook, if it is connected. * We have been through the netgraph locking and 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 error = 0; struct mbuf *m; /* Check interface flags */ if (!((ifp->if_flags & IFF_UP) && (ifp->if_flags & IFF_RUNNING))) return; for (;;) { /* * Grab a packet to transmit. */ m = ifq_dequeue(&ifp->if_snd); /* If there's nothing to send, break. */ if (m == NULL) break; /* * Berkeley packet filter. * Pass packet to bpf if there is a listener. * XXX is this safe? locking? */ BPF_MTAP(ifp, m); if (ifp->if_flags & IFF_MONITOR) { ifp->if_ipackets++; m_freem(m); continue; } /* * 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_opackets++; else ifp->if_oerrors++; } ifq_clr_oactive(&ifp->if_snd); 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, struct ifaltq_subque *ifsq __unused) { const priv_p priv = (priv_p)ifp->if_softc; /* Don't do anything if output is active */ if (ifq_is_oactive(&ifp->if_snd)) return; ifq_set_oactive(&ifp->if_snd); if (ng_send_fn(priv->node, NULL, &ng_eiface_start2, ifp, 0) != 0) ifq_clr_oactive(&ifp->if_snd); } #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 node) { struct ifnet *ifp; priv_p priv; u_char eaddr[6] = {0,0,0,0,0,0}; /* Allocate node and interface private structures */ priv = kmalloc(sizeof(*priv), M_NETGRAPH, M_WAITOK | M_NULLOK | M_ZERO); if (priv == NULL) return (ENOMEM); ifp = priv->ifp = if_alloc(IFT_ETHER); if (ifp == NULL) { kfree(priv, M_NETGRAPH); return (ENOSPC); } /* Link them together */ ifp->if_softc = priv; /* Get an interface unit number */ priv->unit = ng_eiface_next_unit++; /* Link together node and private info */ NG_NODE_SET_PRIVATE(node, priv); priv->node = node; /* Initialize interface structure */ if_initname(ifp, NG_EIFACE_EIFACE_NAME, 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; ifq_set_maxlen(&ifp->if_snd, IFQ_MAXLEN); ifp->if_flags = (IFF_SIMPLEX | IFF_BROADCAST | IFF_MULTICAST); #if 0 /* Give this node name */ bzero(ifname, sizeof(ifname)); ksprintf(ifname, "if%s", ifp->if_xname); (void)ng_name_node(node, ifname); #endif /* Attach the interface */ ether_ifattach(ifp, eaddr, NULL); /* 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); struct ifnet *ifp = priv->ifp; 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); ifp->if_link_state = LINK_STATE_UP; if_link_state_change(ifp); return (0); } /* * Receive a control message */ static int ng_eiface_rcvmsg(node_p node, item_p item, hook_p lasthook) { const 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: { if (msg->header.arglen != ETHER_ADDR_LEN) { error = EINVAL; break; } error = if_setlladdr(priv->ifp, (u_char *)msg->data, ETHER_ADDR_LEN); break; } case NGM_EIFACE_GET_IFNAME: NG_MKRESPONSE(resp, msg, IFNAMSIZ, M_WAITOK | M_NULLOK); if (resp == NULL) { error = ENOMEM; break; } strlcpy(resp->data, ifp->if_xname, IFNAMSIZ); break; case NGM_EIFACE_GET_IFADDRS: { struct ifaddr_container *ifac; caddr_t ptr; int buflen; #define SA_SIZE(s) RT_ROUNDUP((s)->sa_len) /* Determine size of response and allocate it */ buflen = 0; TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) buflen += SA_SIZE(ifac->ifa->ifa_addr); NG_MKRESPONSE(resp, msg, buflen, M_WAITOK | M_NULLOK); if (resp == NULL) { error = ENOMEM; break; } /* Add addresses */ ptr = resp->data; TAILQ_FOREACH(ifac, &ifp->if_addrheads[mycpuid], ifa_link) { struct ifaddr *ifa = ifac->ifa; 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; } /* end of inner switch() */ break; case NGM_FLOW_COOKIE: switch (msg->header.cmd) { case NGM_LINK_IS_UP: ifp->if_link_state = LINK_STATE_UP; if_link_state_change(ifp); break; case NGM_LINK_IS_DOWN: ifp->if_link_state = LINK_STATE_DOWN; if_link_state_change(ifp); break; default: break; } break; default: error = EINVAL; break; } NG_RESPOND_MSG(error, node, item, resp); NG_FREE_MSG(msg); return (error); } /* * Receive data from a hook. Pass the packet to the ether_input routine. */ static int ng_eiface_rcvdata(hook_p hook, item_p item) { const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); struct ifnet *const ifp = priv->ifp; struct mbuf *m; NGI_GET_M(item, m); NG_FREE_ITEM(item); if (!((ifp->if_flags & IFF_UP) && (ifp->if_flags & IFF_RUNNING))) { NG_FREE_M(m); return (ENETDOWN); } if (m->m_len < ETHER_HDR_LEN) { m = m_pullup(m, ETHER_HDR_LEN); if (m == NULL) return (EINVAL); } /* Note receiving interface */ m->m_pkthdr.rcvif = ifp; /* Update interface stats */ ifp->if_ipackets++; ifp->if_input(ifp, m, NULL, -1); /* Done */ return (0); } /* * Shutdown processing. */ static int ng_eiface_rmnode(node_p node) { const priv_p priv = NG_NODE_PRIVATE(node); struct ifnet *const ifp = priv->ifp; ether_ifdetach(ifp); if_free(ifp); kfree(priv, M_NETGRAPH); NG_NODE_SET_PRIVATE(node, NULL); NG_NODE_UNREF(node); return (0); } /* * Hook disconnection */ static int ng_eiface_disconnect(hook_p hook) { const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook)); priv->ether = NULL; return (0); } /* * Handle loading and unloading for this node type. */ static int ng_eiface_mod_event(module_t mod, int event, void *data) { int error = 0; switch (event) { case MOD_LOAD: break; case MOD_UNLOAD: break; default: error = EOPNOTSUPP; break; } return (error); }