/* * ng_iface.c * * Copyright (c) 1996-1999 Whistle Communications, Inc. * All rights reserved. * * Subject to the following obligations and disclaimer of warranty, use and * redistribution of this software, in source or object code forms, with or * without modifications are expressly permitted by Whistle Communications; * provided, however, that: * 1. Any and all reproductions of the source or object code must include the * copyright notice above and the following disclaimer of warranties; and * 2. No rights are granted, in any manner or form, to use Whistle * Communications, Inc. trademarks, including the mark "WHISTLE * COMMUNICATIONS" on advertising, endorsements, or otherwise except as * such appears in the above copyright notice or in the software. * * THIS SOFTWARE IS BEING PROVIDED BY WHISTLE COMMUNICATIONS "AS IS", AND * TO THE MAXIMUM EXTENT PERMITTED BY LAW, WHISTLE COMMUNICATIONS MAKES NO * REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, REGARDING THIS SOFTWARE, * INCLUDING WITHOUT LIMITATION, ANY AND ALL IMPLIED WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR NON-INFRINGEMENT. * WHISTLE COMMUNICATIONS DOES NOT WARRANT, GUARANTEE, OR MAKE ANY * REPRESENTATIONS REGARDING THE USE OF, OR THE RESULTS OF THE USE OF THIS * SOFTWARE IN TERMS OF ITS CORRECTNESS, ACCURACY, RELIABILITY OR OTHERWISE. * IN NO EVENT SHALL WHISTLE COMMUNICATIONS BE LIABLE FOR ANY DAMAGES * RESULTING FROM OR ARISING OUT OF ANY USE OF THIS SOFTWARE, INCLUDING * WITHOUT LIMITATION, ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, * PUNITIVE, OR CONSEQUENTIAL DAMAGES, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES, LOSS OF USE, DATA OR PROFITS, HOWEVER CAUSED AND UNDER 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 WHISTLE COMMUNICATIONS IS ADVISED OF THE POSSIBILITY * OF SUCH DAMAGE. * * Author: Archie Cobbs * * $FreeBSD$ * $Whistle: ng_iface.c,v 1.33 1999/11/01 09:24:51 julian Exp $ */ /* * This node is also a system networking interface. It has * a hook for each protocol (IP, AppleTalk, IPX, etc). Packets * are simply relayed between the interface and the hooks. * * Interfaces are named ng0, ng1, etc. New nodes take the * first available interface name. * * This node also includes Berkeley packet filter support. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* This struct describes one address family */ struct iffam { sa_family_t family; /* Address family */ const char *hookname; /* Name for hook */ }; typedef const struct iffam *iffam_p; /* List of address families supported by our interface */ const static struct iffam gFamilies[] = { { AF_INET, NG_IFACE_HOOK_INET }, { AF_INET6, NG_IFACE_HOOK_INET6 }, { AF_APPLETALK, NG_IFACE_HOOK_ATALK }, { AF_IPX, NG_IFACE_HOOK_IPX }, { AF_ATM, NG_IFACE_HOOK_ATM }, { AF_NATM, NG_IFACE_HOOK_NATM }, { AF_NS, NG_IFACE_HOOK_NS }, }; #define NUM_FAMILIES (sizeof(gFamilies) / sizeof(*gFamilies)) /* Node private data */ struct ng_iface_private { struct ifnet *ifp; /* Our interface */ int unit; /* Interface unit number */ node_p node; /* Our netgraph node */ hook_p hooks[NUM_FAMILIES]; /* Hook for each address family */ }; typedef struct ng_iface_private *priv_p; /* Interface methods */ static void ng_iface_start(struct ifnet *ifp); static int ng_iface_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data); static int ng_iface_output(struct ifnet *ifp, struct mbuf *m0, struct sockaddr *dst, struct rtentry *rt0); static void ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family); #ifdef DEBUG static void ng_iface_print_ioctl(struct ifnet *ifp, int cmd, caddr_t data); #endif /* Netgraph methods */ static ng_constructor_t ng_iface_constructor; static ng_rcvmsg_t ng_iface_rcvmsg; static ng_shutdown_t ng_iface_rmnode; static ng_newhook_t ng_iface_newhook; static ng_rcvdata_t ng_iface_rcvdata; static ng_disconnect_t ng_iface_disconnect; /* Helper stuff */ static iffam_p get_iffam_from_af(sa_family_t family); static iffam_p get_iffam_from_hook(priv_p priv, hook_p hook); static iffam_p get_iffam_from_name(const char *name); static hook_p *get_hook_from_iffam(priv_p priv, iffam_p iffam); /* Parse type for struct ng_iface_ifname */ static const struct ng_parse_fixedstring_info ng_iface_ifname_info = { NG_IFACE_IFACE_NAME_MAX + 1 }; static const struct ng_parse_type ng_iface_ifname_type = { &ng_parse_fixedstring_type, &ng_iface_ifname_info }; /* Parse type for struct ng_cisco_ipaddr */ static const struct ng_parse_struct_info ng_cisco_ipaddr_type_info = NG_CISCO_IPADDR_TYPE_INFO; static const struct ng_parse_type ng_cisco_ipaddr_type = { &ng_parse_struct_type, &ng_cisco_ipaddr_type_info }; /* List of commands and how to convert arguments to/from ASCII */ static const struct ng_cmdlist ng_iface_cmds[] = { { NGM_IFACE_COOKIE, NGM_IFACE_GET_IFNAME, "getifname", NULL, &ng_iface_ifname_type }, { NGM_IFACE_COOKIE, NGM_IFACE_POINT2POINT, "point2point", NULL, NULL }, { NGM_IFACE_COOKIE, NGM_IFACE_BROADCAST, "broadcast", NULL, NULL }, { NGM_CISCO_COOKIE, NGM_CISCO_GET_IPADDR, "getipaddr", NULL, &ng_cisco_ipaddr_type }, { 0 } }; /* Node type descriptor */ static struct ng_type typestruct = { NG_VERSION, NG_IFACE_NODE_TYPE, NULL, ng_iface_constructor, ng_iface_rcvmsg, ng_iface_rmnode, ng_iface_newhook, NULL, NULL, ng_iface_rcvdata, ng_iface_disconnect, ng_iface_cmds }; NETGRAPH_INIT(iface, &typestruct); /* 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_iface_units = NULL; static int ng_iface_units_len = 0; #define UNITS_BITSPERWORD (sizeof(*ng_iface_units) * NBBY) /************************************************************************ HELPER STUFF ************************************************************************/ /* * Get the family descriptor from the family ID */ static __inline__ iffam_p get_iffam_from_af(sa_family_t family) { iffam_p iffam; int k; for (k = 0; k < NUM_FAMILIES; k++) { iffam = &gFamilies[k]; if (iffam->family == family) return (iffam); } return (NULL); } /* * Get the family descriptor from the hook */ static __inline__ iffam_p get_iffam_from_hook(priv_p priv, hook_p hook) { int k; for (k = 0; k < NUM_FAMILIES; k++) if (priv->hooks[k] == hook) return (&gFamilies[k]); return (NULL); } /* * Get the hook from the iffam descriptor */ static __inline__ hook_p * get_hook_from_iffam(priv_p priv, iffam_p iffam) { return (&priv->hooks[iffam - gFamilies]); } /* * Get the iffam descriptor from the name */ static __inline__ iffam_p get_iffam_from_name(const char *name) { iffam_p iffam; int k; for (k = 0; k < NUM_FAMILIES; k++) { iffam = &gFamilies[k]; if (!strcmp(iffam->hookname, name)) return (iffam); } return (NULL); } /* * Find the first free unit number for a new interface. * Increase the size of the unit bitmap as necessary. */ static __inline__ int ng_iface_get_unit(int *unit) { int index, bit; for (index = 0; index < ng_iface_units_len && ng_iface_units[index] == 0; index++); if (index == ng_iface_units_len) { /* extend array */ int i, *newarray, newlen; newlen = (2 * ng_iface_units_len) + 4; MALLOC(newarray, int *, newlen * sizeof(*ng_iface_units), M_NETGRAPH, M_NOWAIT); if (newarray == NULL) return (ENOMEM); bcopy(ng_iface_units, newarray, ng_iface_units_len * sizeof(*ng_iface_units)); for (i = ng_iface_units_len; i < newlen; i++) newarray[i] = ~0; if (ng_iface_units != NULL) FREE(ng_iface_units, M_NETGRAPH); ng_iface_units = newarray; ng_iface_units_len = newlen; } bit = ffs(ng_iface_units[index]) - 1; KASSERT(bit >= 0 && bit <= UNITS_BITSPERWORD - 1, ("%s: word=%d bit=%d", __FUNCTION__, ng_iface_units[index], bit)); ng_iface_units[index] &= ~(1 << bit); *unit = (index * UNITS_BITSPERWORD) + bit; return (0); } /* * Free a no longer needed unit number. */ static __inline__ void ng_iface_free_unit(int unit) { int index, bit; index = unit / UNITS_BITSPERWORD; bit = unit % UNITS_BITSPERWORD; KASSERT(index < ng_iface_units_len, ("%s: unit=%d len=%d", __FUNCTION__, unit, ng_iface_units_len)); KASSERT((ng_iface_units[index] & (1 << bit)) == 0, ("%s: unit=%d is free", __FUNCTION__, unit)); ng_iface_units[index] |= (1 << bit); /* * XXX We could think about reducing the size of ng_iface_units[] * XXX here if the last portion is all ones */ } /************************************************************************ INTERFACE STUFF ************************************************************************/ /* * Process an ioctl for the virtual interface */ static int ng_iface_ioctl(struct ifnet *ifp, u_long command, caddr_t data) { struct ifreq *const ifr = (struct ifreq *) data; int s, error = 0; #ifdef DEBUG ng_iface_print_ioctl(ifp, command, data); #endif s = splimp(); switch (command) { /* These two are mostly handled at a higher layer */ case SIOCSIFADDR: ifp->if_flags |= (IFF_UP | IFF_RUNNING); ifp->if_flags &= ~(IFF_OACTIVE); 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_IFACE_MTU_MAX || ifr->ifr_mtu < NG_IFACE_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); } /* * This routine is called to deliver a packet out the interface. * We simply look at the address family and relay the packet to * the corresponding hook, if it exists and is connected. */ static int ng_iface_output(struct ifnet *ifp, struct mbuf *m, struct sockaddr *dst, struct rtentry *rt0) { const priv_p priv = (priv_p) ifp->if_softc; const iffam_p iffam = get_iffam_from_af(dst->sa_family); meta_p meta = NULL; int len, error = 0; /* Check interface flags */ if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) { m_freem(m); return (ENETDOWN); } /* BPF writes need to be handled specially */ if (dst->sa_family == AF_UNSPEC) { if (m->m_len < 4 && (m = m_pullup(m, 4)) == NULL) return (ENOBUFS); dst->sa_family = (sa_family_t)*mtod(m, int32_t *); m->m_data += 4; m->m_len -= 4; m->m_pkthdr.len -= 4; } /* Berkeley packet filter */ ng_iface_bpftap(ifp, m, dst->sa_family); /* Check address family to determine hook (if known) */ if (iffam == NULL) { m_freem(m); log(LOG_WARNING, "%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, (int)dst->sa_family); return (EAFNOSUPPORT); } /* 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, *get_hook_from_iffam(priv, iffam), m, meta); /* Update stats */ if (error == 0) { ifp->if_obytes += len; ifp->if_opackets++; } return (error); } /* * This routine should never be called */ static void ng_iface_start(struct ifnet *ifp) { printf("%s%d: %s called?", ifp->if_name, ifp->if_unit, __FUNCTION__); } /* * Flash a packet by the BPF (requires prepending 4 byte AF header) * Note the phoney mbuf; this is OK because BPF treats it read-only. */ static void ng_iface_bpftap(struct ifnet *ifp, struct mbuf *m, sa_family_t family) { int32_t family4 = (int32_t)family; struct mbuf m0; KASSERT(family != AF_UNSPEC, ("%s: family=AF_UNSPEC", __FUNCTION__)); if (ifp->if_bpf != NULL) { bzero(&m0, sizeof(m0)); m0.m_next = m; m0.m_len = sizeof(family4); m0.m_data = (char *)&family4; bpf_mtap(ifp, &m0); } } #ifdef DEBUG /* * Display an ioctl to the virtual interface */ static void ng_iface_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_iface_constructor(node_p *nodep) { char ifname[NG_IFACE_IFACE_NAME_MAX + 1]; 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_NOWAIT|M_ZERO); if (priv == NULL) return (ENOMEM); MALLOC(ifp, struct ifnet *, sizeof(*ifp), M_NETGRAPH, M_NOWAIT|M_ZERO); if (ifp == NULL) { FREE(priv, M_NETGRAPH); return (ENOMEM); } /* Link them together */ ifp->if_softc = priv; priv->ifp = ifp; /* Get an interface unit number */ if ((error = ng_iface_get_unit(&priv->unit)) != 0) { FREE(ifp, M_NETGRAPH); FREE(priv, M_NETGRAPH); return (error); } /* Call generic node constructor */ if ((error = ng_make_node_common(&typestruct, nodep)) != 0) { ng_iface_free_unit(priv->unit); FREE(ifp, M_NETGRAPH); FREE(priv, M_NETGRAPH); return (error); } node = *nodep; /* Link together node and private info */ node->private = priv; priv->node = node; /* Initialize interface structure */ ifp->if_name = NG_IFACE_IFACE_NAME; ifp->if_unit = priv->unit; ifp->if_output = ng_iface_output; ifp->if_start = ng_iface_start; ifp->if_ioctl = ng_iface_ioctl; ifp->if_watchdog = NULL; ifp->if_snd.ifq_maxlen = IFQ_MAXLEN; ifp->if_mtu = NG_IFACE_MTU_DEFAULT; ifp->if_flags = (IFF_SIMPLEX|IFF_POINTOPOINT|IFF_NOARP|IFF_MULTICAST); ifp->if_type = IFT_PROPVIRTUAL; /* XXX */ ifp->if_addrlen = 0; /* XXX */ ifp->if_hdrlen = 0; /* XXX */ ifp->if_baudrate = 64000; /* XXX */ TAILQ_INIT(&ifp->if_addrhead); /* Give this node the same name as the interface (if possible) */ bzero(ifname, sizeof(ifname)); snprintf(ifname, sizeof(ifname), "%s%d", ifp->if_name, ifp->if_unit); if (ng_name_node(node, ifname) != 0) log(LOG_WARNING, "%s: can't acquire netgraph name\n", ifname); /* Attach the interface */ if_attach(ifp); bpfattach(ifp, DLT_NULL, sizeof(u_int)); /* Done */ return (0); } /* * Give our ok for a hook to be added */ static int ng_iface_newhook(node_p node, hook_p hook, const char *name) { const iffam_p iffam = get_iffam_from_name(name); hook_p *hookptr; if (iffam == NULL) return (EPFNOSUPPORT); hookptr = get_hook_from_iffam((priv_p) node->private, iffam); if (*hookptr != NULL) return (EISCONN); *hookptr = hook; return (0); } /* * Receive a control message */ static int ng_iface_rcvmsg(node_p node, struct ng_mesg *msg, const char *retaddr, struct ng_mesg **rptr, hook_p lasthook) { 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_IFACE_COOKIE: switch (msg->header.cmd) { case NGM_IFACE_GET_IFNAME: { struct ng_iface_ifname *arg; NG_MKRESPONSE(resp, msg, sizeof(*arg), M_NOWAIT); if (resp == NULL) { error = ENOMEM; break; } arg = (struct ng_iface_ifname *)resp->data; snprintf(arg->ngif_name, sizeof(arg->ngif_name), "%s%d", ifp->if_name, ifp->if_unit); break; } case NGM_IFACE_POINT2POINT: case NGM_IFACE_BROADCAST: { /* Deny request if interface is UP */ if ((ifp->if_flags & IFF_UP) != 0) return (EBUSY); /* Change flags */ switch (msg->header.cmd) { case NGM_IFACE_POINT2POINT: ifp->if_flags |= IFF_POINTOPOINT; ifp->if_flags &= ~IFF_BROADCAST; break; case NGM_IFACE_BROADCAST: ifp->if_flags &= ~IFF_POINTOPOINT; ifp->if_flags |= IFF_BROADCAST; break; } break; } default: error = EINVAL; break; } break; case NGM_CISCO_COOKIE: switch (msg->header.cmd) { case NGM_CISCO_GET_IPADDR: /* we understand this too */ { struct ifaddr *ifa; /* Return the first configured IP address */ TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) { struct ng_cisco_ipaddr *ips; if (ifa->ifa_addr->sa_family != AF_INET) continue; NG_MKRESPONSE(resp, msg, sizeof(ips), M_NOWAIT); if (resp == NULL) { error = ENOMEM; break; } ips = (struct ng_cisco_ipaddr *)resp->data; ips->ipaddr = ((struct sockaddr_in *) ifa->ifa_addr)->sin_addr; ips->netmask = ((struct sockaddr_in *) ifa->ifa_netmask)->sin_addr; break; } /* No IP addresses on this interface? */ if (ifa == NULL) error = EADDRNOTAVAIL; break; } 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 correct input routine. */ static int ng_iface_rcvdata(hook_p hook, struct mbuf *m, meta_p meta, struct mbuf **ret_m, meta_p *ret_meta, struct ng_mesg **resp) { const priv_p priv = hook->node->private; const iffam_p iffam = get_iffam_from_hook(priv, hook); struct ifnet *const ifp = priv->ifp; /* Sanity checks */ KASSERT(iffam != NULL, ("%s: iffam", __FUNCTION__)); KASSERT(m->m_flags & M_PKTHDR, ("%s: not pkthdr", __FUNCTION__)); if (m == NULL) return (EINVAL); if ((ifp->if_flags & IFF_UP) == 0) { NG_FREE_DATA(m, meta); return (ENETDOWN); } /* Update interface stats */ ifp->if_ipackets++; ifp->if_ibytes += m->m_pkthdr.len; /* Note receiving interface */ m->m_pkthdr.rcvif = ifp; /* Berkeley packet filter */ ng_iface_bpftap(ifp, m, iffam->family); /* Ignore any meta-data */ NG_FREE_META(meta); /* Send packet */ return family_enqueue(iffam->family, m); } /* * Shutdown and remove the node and its associated interface. */ static int ng_iface_rmnode(node_p node) { const priv_p priv = node->private; ng_cutlinks(node); ng_unname(node); bpfdetach(priv->ifp); if_detach(priv->ifp); priv->ifp = NULL; ng_iface_free_unit(priv->unit); FREE(priv, M_NETGRAPH); node->private = NULL; ng_unref(node); return (0); } /* * Hook disconnection. Note that we do *not* shutdown when all * hooks have been disconnected. */ static int ng_iface_disconnect(hook_p hook) { const priv_p priv = hook->node->private; const iffam_p iffam = get_iffam_from_hook(priv, hook); if (iffam == NULL) panic(__FUNCTION__); *get_hook_from_iffam(priv, iffam) = NULL; return (0); }