diff options
Diffstat (limited to 'sys/net/if_ethersubr.c')
| -rw-r--r-- | sys/net/if_ethersubr.c | 1308 |
1 files changed, 1308 insertions, 0 deletions
diff --git a/sys/net/if_ethersubr.c b/sys/net/if_ethersubr.c new file mode 100644 index 0000000..37c3d11 --- /dev/null +++ b/sys/net/if_ethersubr.c @@ -0,0 +1,1308 @@ +/* + * Copyright (c) 1982, 1989, 1993 + * The Regents of the University of California. 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, 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. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. + * + * @(#)if_ethersubr.c 8.1 (Berkeley) 6/10/93 + * $FreeBSD$ + */ + +#include "opt_atalk.h" +#include "opt_inet.h" +#include "opt_inet6.h" +#include "opt_ipx.h" +#include "opt_bdg.h" +#include "opt_netgraph.h" + +#include <sys/param.h> +#include <sys/systm.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <sys/sockio.h> +#include <sys/sysctl.h> + +#include <net/if.h> +#include <net/netisr.h> +#include <net/route.h> +#include <net/if_llc.h> +#include <net/if_dl.h> +#include <net/if_types.h> + +#if defined(INET) || defined(INET6) +#include <netinet/in.h> +#include <netinet/in_var.h> +#include <netinet/if_ether.h> +#endif +#ifdef INET6 +#include <netinet6/nd6.h> +#include <netinet6/in6_ifattach.h> +#endif + +#ifdef IPX +#include <netipx/ipx.h> +#include <netipx/ipx_if.h> +int (*ef_inputp)(struct ifnet*, struct ether_header *eh, struct mbuf *m); +int (*ef_outputp)(struct ifnet *ifp, struct mbuf *m, + struct sockaddr *dst, short *tp); +#endif + +#ifdef NS +#include <netns/ns.h> +#include <netns/ns_if.h> +ushort ns_nettype; +int ether_outputdebug = 0; +int ether_inputdebug = 0; +#endif + +#ifdef ISO +#include <netiso/argo_debug.h> +#include <netiso/iso.h> +#include <netiso/iso_var.h> +#include <netiso/iso_snpac.h> +#endif + +/*#ifdef LLC +#include <netccitt/dll.h> +#include <netccitt/llc_var.h> +#endif*/ + +#if defined(LLC) && defined(CCITT) +extern struct ifqueue pkintrq; +#endif + +#ifdef NETATALK +#include <netatalk/at.h> +#include <netatalk/at_var.h> +#include <netatalk/at_extern.h> + +#define llc_snap_org_code llc_un.type_snap.org_code +#define llc_snap_ether_type llc_un.type_snap.ether_type + +extern u_char at_org_code[3]; +extern u_char aarp_org_code[3]; +#endif /* NETATALK */ + +#ifdef BRIDGE +#include <net/bridge.h> +#endif + +#include "vlan.h" +#if NVLAN > 0 +#include <net/if_vlan_var.h> +#endif /* NVLAN > 0 */ + +static int ether_resolvemulti __P((struct ifnet *, struct sockaddr **, + struct sockaddr *)); +u_char etherbroadcastaddr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; +#define senderr(e) do { error = (e); goto bad;} while (0) +#define IFP2AC(IFP) ((struct arpcom *)IFP) + +#ifdef NETGRAPH +#include <netgraph/ng_ether.h> +#include <netgraph/ng_message.h> +#include <netgraph/netgraph.h> + +static void ngether_init(void* ignored); +static void ngether_send(struct arpcom *ac, + struct ether_header *eh, struct mbuf *m); +static ng_constructor_t ngether_constructor; +static ng_rcvmsg_t ngether_rcvmsg; +static ng_shutdown_t ngether_rmnode; +static ng_newhook_t ngether_newhook; +static ng_connect_t ngether_connect; +static ng_rcvdata_t ngether_rcvdata; +static ng_disconnect_t ngether_disconnect; + +static struct ng_type typestruct = { + NG_VERSION, + NG_ETHER_NODE_TYPE, + NULL, + ngether_constructor, + ngether_rcvmsg, + ngether_rmnode, + ngether_newhook, + NULL, + ngether_connect, + ngether_rcvdata, + ngether_rcvdata, + ngether_disconnect, + NULL +}; + +#define AC2NG(AC) ((node_p)((AC)->ac_ng)) +#define NGEF_DIVERT NGF_TYPE1 /* all packets sent to netgraph */ +#endif /* NETGRAPH */ + +/* + * Ethernet output routine. + * Encapsulate a packet of type family for the local net. + * Use trailer local net encapsulation if enough data in first + * packet leaves a multiple of 512 bytes of data in remainder. + * Assumes that ifp is actually pointer to arpcom structure. + */ +int +ether_output(ifp, m, dst, rt0) + register struct ifnet *ifp; + struct mbuf *m; + struct sockaddr *dst; + struct rtentry *rt0; +{ + short type; + int s, error = 0, hdrcmplt = 0; + u_char esrc[6], edst[6]; + register struct rtentry *rt; + register struct ether_header *eh; + int off, len = m->m_pkthdr.len, loop_copy = 0; + int hlen; /* link layer header lenght */ + struct arpcom *ac = IFP2AC(ifp); + + if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) + senderr(ENETDOWN); + rt = rt0; + if (rt) { + if ((rt->rt_flags & RTF_UP) == 0) { + rt0 = rt = rtalloc1(dst, 1, 0UL); + if (rt0) + rt->rt_refcnt--; + else + senderr(EHOSTUNREACH); + } + if (rt->rt_flags & RTF_GATEWAY) { + if (rt->rt_gwroute == 0) + goto lookup; + if (((rt = rt->rt_gwroute)->rt_flags & RTF_UP) == 0) { + rtfree(rt); rt = rt0; + lookup: rt->rt_gwroute = rtalloc1(rt->rt_gateway, 1, + 0UL); + if ((rt = rt->rt_gwroute) == 0) + senderr(EHOSTUNREACH); + } + } + if (rt->rt_flags & RTF_REJECT) + if (rt->rt_rmx.rmx_expire == 0 || + time_second < rt->rt_rmx.rmx_expire) + senderr(rt == rt0 ? EHOSTDOWN : EHOSTUNREACH); + } + hlen = ETHER_HDR_LEN; + switch (dst->sa_family) { +#ifdef INET + case AF_INET: + if (!arpresolve(ac, rt, m, dst, edst, rt0)) + return (0); /* if not yet resolved */ + off = m->m_pkthdr.len - m->m_len; + type = htons(ETHERTYPE_IP); + break; +#endif +#ifdef INET6 + case AF_INET6: + if (!nd6_storelladdr(&ac->ac_if, rt, m, dst, (u_char *)edst)) { + /* this must be impossible, so we bark */ + printf("nd6_storelladdr failed\n"); + return(0); + } + off = m->m_pkthdr.len - m->m_len; + type = htons(ETHERTYPE_IPV6); + break; +#endif +#ifdef IPX + case AF_IPX: + if (ef_outputp) { + error = ef_outputp(ifp, m, dst, &type); + if (error < 0) + senderr(EPFNOSUPPORT); + if (error > 0) + type = htons(ETHERTYPE_IPX); + } else + type = htons(ETHERTYPE_IPX); + bcopy((caddr_t)&(((struct sockaddr_ipx *)dst)->sipx_addr.x_host), + (caddr_t)edst, sizeof (edst)); + break; +#endif +#ifdef NETATALK + case AF_APPLETALK: + { + struct at_ifaddr *aa; + + if ((aa = at_ifawithnet((struct sockaddr_at *)dst)) == NULL) { + goto bad; + } + if (!aarpresolve(ac, m, (struct sockaddr_at *)dst, edst)) + return (0); + /* + * In the phase 2 case, need to prepend an mbuf for the llc header. + * Since we must preserve the value of m, which is passed to us by + * value, we m_copy() the first mbuf, and use it for our llc header. + */ + if ( aa->aa_flags & AFA_PHASE2 ) { + struct llc llc; + + M_PREPEND(m, sizeof(struct llc), M_WAIT); + len += sizeof(struct llc); + llc.llc_dsap = llc.llc_ssap = LLC_SNAP_LSAP; + llc.llc_control = LLC_UI; + bcopy(at_org_code, llc.llc_snap_org_code, sizeof(at_org_code)); + llc.llc_snap_ether_type = htons( ETHERTYPE_AT ); + bcopy(&llc, mtod(m, caddr_t), sizeof(struct llc)); + type = htons(m->m_pkthdr.len); + hlen = sizeof(struct llc) + ETHER_HDR_LEN; + } else { + type = htons(ETHERTYPE_AT); + } + break; + } +#endif NETATALK +#ifdef NS + case AF_NS: + switch(ns_nettype){ + default: + case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ + type = 0x8137; + break; + case 0x0: /* Novell 802.3 */ + type = htons( m->m_pkthdr.len); + break; + case 0xe0e0: /* Novell 802.2 and Token-Ring */ + M_PREPEND(m, 3, M_WAIT); + type = htons( m->m_pkthdr.len); + cp = mtod(m, u_char *); + *cp++ = 0xE0; + *cp++ = 0xE0; + *cp++ = 0x03; + break; + } + bcopy((caddr_t)&(((struct sockaddr_ns *)dst)->sns_addr.x_host), + (caddr_t)edst, sizeof (edst)); + /* + * XXX if ns_thishost is the same as the node's ethernet + * address then just the default code will catch this anyhow. + * So I'm not sure if this next clause should be here at all? + * [JRE] + */ + if (!bcmp((caddr_t)edst, (caddr_t)&ns_thishost, sizeof(edst))){ + m->m_pkthdr.rcvif = ifp; + schednetisr(NETISR_NS); + inq = &nsintrq; + s = splimp(); + if (IF_QFULL(inq)) { + IF_DROP(inq); + m_freem(m); + } else + IF_ENQUEUE(inq, m); + splx(s); + return (error); + } + if (!bcmp((caddr_t)edst, (caddr_t)&ns_broadhost, sizeof(edst))){ + m->m_flags |= M_BCAST; + } + break; +#endif /* NS */ +#ifdef ISO + case AF_ISO: { + int snpalen; + struct llc *l; + register struct sockaddr_dl *sdl; + + if (rt && (sdl = (struct sockaddr_dl *)rt->rt_gateway) && + sdl->sdl_family == AF_LINK && sdl->sdl_alen > 0) { + bcopy(LLADDR(sdl), (caddr_t)edst, sizeof(edst)); + } else if (error = + iso_snparesolve(ifp, (struct sockaddr_iso *)dst, + (char *)edst, &snpalen)) + goto bad; /* Not Resolved */ + /* If broadcasting on a simplex interface, loopback a copy */ + if (*edst & 1) + m->m_flags |= (M_BCAST|M_MCAST); + M_PREPEND(m, 3, M_DONTWAIT); + if (m == NULL) + return (0); + type = htons(m->m_pkthdr.len); + l = mtod(m, struct llc *); + l->llc_dsap = l->llc_ssap = LLC_ISO_LSAP; + l->llc_control = LLC_UI; + len += 3; + IFDEBUG(D_ETHER) + int i; + printf("unoutput: sending pkt to: "); + for (i=0; i<6; i++) + printf("%x ", edst[i] & 0xff); + printf("\n"); + ENDDEBUG + } break; +#endif /* ISO */ +#ifdef LLC +/* case AF_NSAP: */ + case AF_CCITT: { + register struct sockaddr_dl *sdl = + (struct sockaddr_dl *) rt -> rt_gateway; + + if (sdl && sdl->sdl_family == AF_LINK + && sdl->sdl_alen > 0) { + bcopy(LLADDR(sdl), (char *)edst, sizeof(edst)); + } else goto bad; /* Not a link interface ? Funny ... */ + if (*edst & 1) + loop_copy = 1; + type = htons(m->m_pkthdr.len); +#ifdef LLC_DEBUG + { + int i; + register struct llc *l = mtod(m, struct llc *); + + printf("ether_output: sending LLC2 pkt to: "); + for (i=0; i<6; i++) + printf("%x ", edst[i] & 0xff); + printf(" len 0x%x dsap 0x%x ssap 0x%x control 0x%x\n", + type & 0xff, l->llc_dsap & 0xff, l->llc_ssap &0xff, + l->llc_control & 0xff); + + } +#endif /* LLC_DEBUG */ + } break; +#endif /* LLC */ + + case pseudo_AF_HDRCMPLT: + hdrcmplt = 1; + eh = (struct ether_header *)dst->sa_data; + (void)memcpy(esrc, eh->ether_shost, sizeof (esrc)); + /* FALLTHROUGH */ + + case AF_UNSPEC: + loop_copy = -1; /* if this is for us, don't do it */ + eh = (struct ether_header *)dst->sa_data; + (void)memcpy(edst, eh->ether_dhost, sizeof (edst)); + type = eh->ether_type; + break; + + default: + printf("%s%d: can't handle af%d\n", ifp->if_name, ifp->if_unit, + dst->sa_family); + senderr(EAFNOSUPPORT); + } + + /* + * Add local net header. If no space in first mbuf, + * allocate another. + */ + M_PREPEND(m, sizeof (struct ether_header), M_DONTWAIT); + if (m == 0) + senderr(ENOBUFS); + eh = mtod(m, struct ether_header *); + (void)memcpy(&eh->ether_type, &type, + sizeof(eh->ether_type)); + (void)memcpy(eh->ether_dhost, edst, sizeof (edst)); + if (hdrcmplt) + (void)memcpy(eh->ether_shost, esrc, + sizeof(eh->ether_shost)); + else + (void)memcpy(eh->ether_shost, ac->ac_enaddr, + sizeof(eh->ether_shost)); + + /* + * If a simplex interface, and the packet is being sent to our + * Ethernet address or a broadcast address, loopback a copy. + * XXX To make a simplex device behave exactly like a duplex + * device, we should copy in the case of sending to our own + * ethernet address (thus letting the original actually appear + * on the wire). However, we don't do that here for security + * reasons and compatibility with the original behavior. + */ + if ((ifp->if_flags & IFF_SIMPLEX) && (loop_copy != -1)) { + if ((m->m_flags & M_BCAST) || (loop_copy > 0)) { + struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); + + (void) if_simloop(ifp, n, dst, hlen); + } else if (bcmp(eh->ether_dhost, + eh->ether_shost, ETHER_ADDR_LEN) == 0) { + (void) if_simloop(ifp, m, dst, hlen); + return (0); /* XXX */ + } + } +#ifdef BRIDGE + if (do_bridge) { + struct mbuf *m0 = m ; + + if (m->m_pkthdr.rcvif) + m->m_pkthdr.rcvif = NULL ; + ifp = bridge_dst_lookup(m); + bdg_forward(&m0, ifp); + if (m0) + m_freem(m0); + return (0); + } +#endif + s = splimp(); + /* + * Queue message on interface, and start output if interface + * not yet active. + */ + if (IF_QFULL(&ifp->if_snd)) { + IF_DROP(&ifp->if_snd); + splx(s); + senderr(ENOBUFS); + } + IF_ENQUEUE(&ifp->if_snd, m); + if ((ifp->if_flags & IFF_OACTIVE) == 0) + (*ifp->if_start)(ifp); + splx(s); + ifp->if_obytes += len + sizeof (struct ether_header); + if (m->m_flags & M_MCAST) + ifp->if_omcasts++; + return (error); + +bad: + if (m) + m_freem(m); + return (error); +} + +/* + * Process a received Ethernet packet; + * the packet is in the mbuf chain m without + * the ether header, which is provided separately. + */ +void +ether_input(ifp, eh, m) + struct ifnet *ifp; + register struct ether_header *eh; + struct mbuf *m; +{ + register struct ifqueue *inq; + u_short ether_type; + int s; +#if defined (ISO) || defined (LLC) || defined(NETATALK) + register struct llc *l; +#endif + + if ((ifp->if_flags & IFF_UP) == 0) { + m_freem(m); + return; + } + ifp->if_ibytes += m->m_pkthdr.len + sizeof (*eh); + if (eh->ether_dhost[0] & 1) { + if (bcmp((caddr_t)etherbroadcastaddr, (caddr_t)eh->ether_dhost, + sizeof(etherbroadcastaddr)) == 0) + m->m_flags |= M_BCAST; + else + m->m_flags |= M_MCAST; + } + if (m->m_flags & (M_BCAST|M_MCAST)) + ifp->if_imcasts++; + + ether_type = ntohs(eh->ether_type); + +#ifdef NETGRAPH + { + struct arpcom *ac = IFP2AC(ifp); + if (AC2NG(ac) && (AC2NG(ac)->flags & NGEF_DIVERT)) { + ngether_send(ac, eh, m); + return; + } + } +#endif /* NETGRAPH */ + +#if NVLAN > 0 + if (ether_type == vlan_proto) { + if (vlan_input(eh, m) < 0) + ifp->if_data.ifi_noproto++; + return; + } +#endif /* NVLAN > 0 */ + + switch (ether_type) { +#ifdef INET + case ETHERTYPE_IP: + if (ipflow_fastforward(m)) + return; + schednetisr(NETISR_IP); + inq = &ipintrq; + break; + + case ETHERTYPE_ARP: + schednetisr(NETISR_ARP); + inq = &arpintrq; + break; +#endif +#ifdef IPX + case ETHERTYPE_IPX: + if (ef_inputp && ef_inputp(ifp, eh, m) == 0) + return; + schednetisr(NETISR_IPX); + inq = &ipxintrq; + break; +#endif +#ifdef INET6 + case ETHERTYPE_IPV6: + schednetisr(NETISR_IPV6); + inq = &ip6intrq; + break; +#endif +#ifdef NS + case 0x8137: /* Novell Ethernet_II Ethernet TYPE II */ + schednetisr(NETISR_NS); + inq = &nsintrq; + break; + +#endif /* NS */ +#ifdef NETATALK + case ETHERTYPE_AT: + schednetisr(NETISR_ATALK); + inq = &atintrq1; + break; + case ETHERTYPE_AARP: + /* probably this should be done with a NETISR as well */ + aarpinput(IFP2AC(ifp), m); /* XXX */ + return; +#endif NETATALK + default: +#ifdef IPX + if (ef_inputp && ef_inputp(ifp, eh, m) == 0) + return; +#endif /* IPX */ +#ifdef NS + checksum = mtod(m, ushort *); + /* Novell 802.3 */ + if ((ether_type <= ETHERMTU) && + ((*checksum == 0xffff) || (*checksum == 0xE0E0))){ + if(*checksum == 0xE0E0) { + m->m_pkthdr.len -= 3; + m->m_len -= 3; + m->m_data += 3; + } + schednetisr(NETISR_NS); + inq = &nsintrq; + break; + } +#endif /* NS */ +#if defined (ISO) || defined (LLC) || defined(NETATALK) + if (ether_type > ETHERMTU) + goto dropanyway; + l = mtod(m, struct llc *); + switch (l->llc_dsap) { +#ifdef NETATALK + case LLC_SNAP_LSAP: + switch (l->llc_control) { + case LLC_UI: + if (l->llc_ssap != LLC_SNAP_LSAP) + goto dropanyway; + + if (Bcmp(&(l->llc_snap_org_code)[0], at_org_code, + sizeof(at_org_code)) == 0 && + ntohs(l->llc_snap_ether_type) == ETHERTYPE_AT) { + inq = &atintrq2; + m_adj( m, sizeof( struct llc )); + schednetisr(NETISR_ATALK); + break; + } + + if (Bcmp(&(l->llc_snap_org_code)[0], aarp_org_code, + sizeof(aarp_org_code)) == 0 && + ntohs(l->llc_snap_ether_type) == ETHERTYPE_AARP) { + m_adj( m, sizeof( struct llc )); + aarpinput(IFP2AC(ifp), m); /* XXX */ + return; + } + + default: + goto dropanyway; + } + break; +#endif NETATALK +#ifdef ISO + case LLC_ISO_LSAP: + switch (l->llc_control) { + case LLC_UI: + /* LLC_UI_P forbidden in class 1 service */ + if ((l->llc_dsap == LLC_ISO_LSAP) && + (l->llc_ssap == LLC_ISO_LSAP)) { + /* LSAP for ISO */ + if (m->m_pkthdr.len > ether_type) + m_adj(m, ether_type - m->m_pkthdr.len); + m->m_data += 3; /* XXX */ + m->m_len -= 3; /* XXX */ + m->m_pkthdr.len -= 3; /* XXX */ + M_PREPEND(m, sizeof *eh, M_DONTWAIT); + if (m == 0) + return; + *mtod(m, struct ether_header *) = *eh; + IFDEBUG(D_ETHER) + printf("clnp packet"); + ENDDEBUG + schednetisr(NETISR_ISO); + inq = &clnlintrq; + break; + } + goto dropanyway; + + case LLC_XID: + case LLC_XID_P: + if(m->m_len < 6) + goto dropanyway; + l->llc_window = 0; + l->llc_fid = 9; + l->llc_class = 1; + l->llc_dsap = l->llc_ssap = 0; + /* Fall through to */ + case LLC_TEST: + case LLC_TEST_P: + { + struct sockaddr sa; + register struct ether_header *eh2; + int i; + u_char c = l->llc_dsap; + + l->llc_dsap = l->llc_ssap; + l->llc_ssap = c; + if (m->m_flags & (M_BCAST | M_MCAST)) + bcopy((caddr_t)ac->ac_enaddr, + (caddr_t)eh->ether_dhost, 6); + sa.sa_family = AF_UNSPEC; + sa.sa_len = sizeof(sa); + eh2 = (struct ether_header *)sa.sa_data; + for (i = 0; i < 6; i++) { + eh2->ether_shost[i] = c = eh->ether_dhost[i]; + eh2->ether_dhost[i] = + eh->ether_dhost[i] = eh->ether_shost[i]; + eh->ether_shost[i] = c; + } + ifp->if_output(ifp, m, &sa, NULL); + return; + } + default: + m_freem(m); + return; + } + break; +#endif /* ISO */ +#ifdef LLC + case LLC_X25_LSAP: + { + if (m->m_pkthdr.len > ether_type) + m_adj(m, ether_type - m->m_pkthdr.len); + M_PREPEND(m, sizeof(struct sdl_hdr) , M_DONTWAIT); + if (m == 0) + return; + if ( !sdl_sethdrif(ifp, eh->ether_shost, LLC_X25_LSAP, + eh->ether_dhost, LLC_X25_LSAP, 6, + mtod(m, struct sdl_hdr *))) + panic("ETHER cons addr failure"); + mtod(m, struct sdl_hdr *)->sdlhdr_len = ether_type; +#ifdef LLC_DEBUG + printf("llc packet\n"); +#endif /* LLC_DEBUG */ + schednetisr(NETISR_CCITT); + inq = &llcintrq; + break; + } +#endif /* LLC */ + dropanyway: + default: +#ifdef NETGRAPH + ngether_send(IFP2AC(ifp), eh, m); +#else /* NETGRAPH */ + m_freem(m); +#endif /* NETGRAPH */ + return; + } +#else /* ISO || LLC || NETATALK */ +#ifdef NETGRAPH + ngether_send(IFP2AC(ifp), eh, m); +#else /* NETGRAPH */ + m_freem(m); +#endif /* NETGRAPH */ + return; +#endif /* ISO || LLC || NETATALK */ + } + + s = splimp(); + if (IF_QFULL(inq)) { + IF_DROP(inq); + m_freem(m); + } else + IF_ENQUEUE(inq, m); + splx(s); +} + +/* + * Perform common duties while attaching to interface list + */ +void +ether_ifattach(ifp) + register struct ifnet *ifp; +{ + register struct ifaddr *ifa; + register struct sockaddr_dl *sdl; + + ifp->if_type = IFT_ETHER; + ifp->if_addrlen = 6; + ifp->if_hdrlen = 14; + ifp->if_mtu = ETHERMTU; + ifp->if_resolvemulti = ether_resolvemulti; + if (ifp->if_baudrate == 0) + ifp->if_baudrate = 10000000; + ifa = ifnet_addrs[ifp->if_index - 1]; + if (ifa == 0) { + printf("ether_ifattach: no lladdr!\n"); + return; + } + sdl = (struct sockaddr_dl *)ifa->ifa_addr; + sdl->sdl_type = IFT_ETHER; + sdl->sdl_alen = ifp->if_addrlen; + bcopy((IFP2AC(ifp))->ac_enaddr, LLADDR(sdl), ifp->if_addrlen); +#ifdef NETGRAPH + ngether_init(ifp); +#endif /* NETGRAPH */ +#ifdef INET6 + in6_ifattach_getifid(ifp); +#endif +} + +SYSCTL_DECL(_net_link); +SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW, 0, "Ethernet"); + +int +ether_ioctl(ifp, command, data) + struct ifnet *ifp; + int command; + caddr_t data; +{ + struct ifaddr *ifa = (struct ifaddr *) data; + struct ifreq *ifr = (struct ifreq *) data; + int error = 0; + + switch (command) { + case SIOCSIFADDR: + ifp->if_flags |= IFF_UP; + + switch (ifa->ifa_addr->sa_family) { +#ifdef INET + case AF_INET: + ifp->if_init(ifp->if_softc); /* before arpwhohas */ + arp_ifinit(IFP2AC(ifp), ifa); + break; +#endif +#ifdef IPX + /* + * XXX - This code is probably wrong + */ + case AF_IPX: + { + register struct ipx_addr *ina = &(IA_SIPX(ifa)->sipx_addr); + struct arpcom *ac = IFP2AC(ifp); + + if (ipx_nullhost(*ina)) + ina->x_host = + *(union ipx_host *) + ac->ac_enaddr; + else { + bcopy((caddr_t) ina->x_host.c_host, + (caddr_t) ac->ac_enaddr, + sizeof(ac->ac_enaddr)); + } + + /* + * Set new address + */ + ifp->if_init(ifp->if_softc); + break; + } +#endif +#ifdef NS + /* + * XXX - This code is probably wrong + */ + case AF_NS: + { + register struct ns_addr *ina = &(IA_SNS(ifa)->sns_addr); + struct arpcom *ac = IFP2AC(ifp); + + if (ns_nullhost(*ina)) + ina->x_host = + *(union ns_host *) (ac->ac_enaddr); + else { + bcopy((caddr_t) ina->x_host.c_host, + (caddr_t) ac->ac_enaddr, + sizeof(ac->ac_enaddr)); + } + + /* + * Set new address + */ + ifp->if_init(ifp->if_softc); + break; + } +#endif + default: + ifp->if_init(ifp->if_softc); + break; + } + break; + + case SIOCGIFADDR: + { + struct sockaddr *sa; + + sa = (struct sockaddr *) & ifr->ifr_data; + bcopy(IFP2AC(ifp)->ac_enaddr, + (caddr_t) sa->sa_data, ETHER_ADDR_LEN); + } + break; + + case SIOCSIFMTU: + /* + * Set the interface MTU. + */ + if (ifr->ifr_mtu > ETHERMTU) { + error = EINVAL; + } else { + ifp->if_mtu = ifr->ifr_mtu; + } + break; + } + return (error); +} + +int +ether_resolvemulti(ifp, llsa, sa) + struct ifnet *ifp; + struct sockaddr **llsa; + struct sockaddr *sa; +{ + struct sockaddr_dl *sdl; + struct sockaddr_in *sin; +#ifdef INET6 + struct sockaddr_in6 *sin6; +#endif + u_char *e_addr; + + switch(sa->sa_family) { + case AF_LINK: + /* + * No mapping needed. Just check that it's a valid MC address. + */ + sdl = (struct sockaddr_dl *)sa; + e_addr = LLADDR(sdl); + if ((e_addr[0] & 1) != 1) + return EADDRNOTAVAIL; + *llsa = 0; + return 0; + +#ifdef INET + case AF_INET: + sin = (struct sockaddr_in *)sa; + if (!IN_MULTICAST(ntohl(sin->sin_addr.s_addr))) + return EADDRNOTAVAIL; + MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, + M_WAITOK); + sdl->sdl_len = sizeof *sdl; + sdl->sdl_family = AF_LINK; + sdl->sdl_index = ifp->if_index; + sdl->sdl_type = IFT_ETHER; + sdl->sdl_nlen = 0; + sdl->sdl_alen = ETHER_ADDR_LEN; + sdl->sdl_slen = 0; + e_addr = LLADDR(sdl); + ETHER_MAP_IP_MULTICAST(&sin->sin_addr, e_addr); + *llsa = (struct sockaddr *)sdl; + return 0; +#endif +#ifdef INET6 + case AF_INET6: + sin6 = (struct sockaddr_in6 *)sa; + if (!IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) + return EADDRNOTAVAIL; + MALLOC(sdl, struct sockaddr_dl *, sizeof *sdl, M_IFMADDR, + M_WAITOK); + sdl->sdl_len = sizeof *sdl; + sdl->sdl_family = AF_LINK; + sdl->sdl_index = ifp->if_index; + sdl->sdl_type = IFT_ETHER; + sdl->sdl_nlen = 0; + sdl->sdl_alen = ETHER_ADDR_LEN; + sdl->sdl_slen = 0; + e_addr = LLADDR(sdl); + ETHER_MAP_IPV6_MULTICAST(&sin6->sin6_addr, e_addr); + *llsa = (struct sockaddr *)sdl; + return 0; +#endif + + default: + /* + * Well, the text isn't quite right, but it's the name + * that counts... + */ + return EAFNOSUPPORT; + } +} + +#ifdef NETGRAPH + +/*********************************************************************** + * This section contains the methods for the Netgraph interface + ***********************************************************************/ +/* It's Ascii-art time! + * The ifnet is the first part of the arpcom which must be + * the first part of the device's softc.. yuk. + * + * +--------------------------+-----+---------+ + * | struct ifnet (*ifp) | | | + * | | | | + * +--------------------------+ | | + * +--|[ac_ng] struct arpcom (*ac) | | + * | +--------------------------------+ | + * | | struct softc (*ifp->if_softc) (device) | + * | +------------------------------------------+ + * | ^ + * AC2NG() | + * | v + * | +----------------------+ + * | | [private] [flags] | + * +------>| struct ng_node | + * | [hooks] | ** we only allow one hook + * +----------------------+ + * ^ + * | + * v + * +-------------+ + * | [node] | + * | hook | + * | [private]|-- *unused* + * +-------------+ + */ + +/* + * called during interface attaching + */ +static void +ngether_init(void *ifpvoid) +{ + struct ifnet *ifp = ifpvoid; + struct arpcom *ac = IFP2AC(ifp); + static int ngether_done_init; + char namebuf[32]; + node_p node; + + /* + * we have found a node, make sure our 'type' is availabe. + */ + if (ngether_done_init == 0) { + if (ng_newtype(&typestruct)) { + printf("ngether install failed\n"); + return; + } + ngether_done_init = 1; + } + if (ng_make_node_common(&typestruct, &node) != 0) + return; + ac->ac_ng = node; + node->private = ifp; + sprintf(namebuf, "%s%d", ifp->if_name, ifp->if_unit); + ng_name_node(AC2NG(ac), namebuf); +} + +/* + * It is not possible or allowable to create a node of this type. + * If the hardware exists, it will already have created it. + */ +static int +ngether_constructor(node_p *nodep) +{ + return (EINVAL); +} + +/* + * Give our ok for a hook to be added... + * + * Allow one hook at a time (rawdata). + * It can eiteh rdivert everything or only unclaimed packets. + */ +static int +ngether_newhook(node_p node, hook_p hook, const char *name) +{ + + /* check if there is already a hook */ + if (LIST_FIRST(&(node->hooks))) + return(EISCONN); + /* + * Check for which mode hook we want. + */ + if (strcmp(name, NG_ETHER_HOOK_ORPHAN) != 0) { + if (strcmp(name, NG_ETHER_HOOK_DIVERT) != 0) { + return (EINVAL); + } + node->flags |= NGEF_DIVERT; + } else { + node->flags &= ~NGEF_DIVERT; + } + return (0); +} + +/* + * incoming messages. + * Just respond to the generic TEXT_STATUS message + */ +static int +ngether_rcvmsg(node_p node, + struct ng_mesg *msg, const char *retaddr, struct ng_mesg **resp) +{ + struct ifnet *ifp; + int error = 0; + + ifp = node->private; + switch (msg->header.typecookie) { + case NGM_ETHER_COOKIE: + error = EINVAL; + break; + case NGM_GENERIC_COOKIE: + switch(msg->header.cmd) { + case NGM_TEXT_STATUS: { + char *arg; + int pos = 0; + int resplen = sizeof(struct ng_mesg) + 512; + MALLOC(*resp, struct ng_mesg *, resplen, + M_NETGRAPH, M_NOWAIT); + if (*resp == NULL) { + error = ENOMEM; + break; + } + bzero(*resp, resplen); + arg = (*resp)->data; + + /* + * Put in the throughput information. + */ + pos = sprintf(arg, "%ld bytes in, %ld bytes out\n", + ifp->if_ibytes, ifp->if_obytes); + pos += sprintf(arg + pos, + "%ld output errors\n", + ifp->if_oerrors); + pos += sprintf(arg + pos, + "ierrors = %ld\n", + ifp->if_ierrors); + + (*resp)->header.version = NG_VERSION; + (*resp)->header.arglen = strlen(arg) + 1; + (*resp)->header.token = msg->header.token; + (*resp)->header.typecookie = NGM_ETHER_COOKIE; + (*resp)->header.cmd = msg->header.cmd; + strncpy((*resp)->header.cmdstr, "status", + NG_CMDSTRLEN); + } + break; + default: + error = EINVAL; + break; + } + break; + default: + error = EINVAL; + break; + } + free(msg, M_NETGRAPH); + return (error); +} + +/* + * Receive a completed ethernet packet. + * Queue it for output. + */ +static int +ngether_rcvdata(hook_p hook, struct mbuf *m, meta_p meta) +{ + struct ifnet *ifp; + int error = 0; + int s; + struct ether_header *eh; + + ifp = hook->node->private; + + if ((ifp->if_flags & (IFF_UP|IFF_RUNNING)) != (IFF_UP|IFF_RUNNING)) + senderr(ENETDOWN); + /* drop in the MAC address */ + eh = mtod(m, struct ether_header *); + bcopy(IFP2AC(ifp)->ac_enaddr, eh->ether_shost, 6); + /* + * If a simplex interface, and the packet is being sent to our + * Ethernet address or a broadcast address, loopback a copy. + * XXX To make a simplex device behave exactly like a duplex + * device, we should copy in the case of sending to our own + * ethernet address (thus letting the original actually appear + * on the wire). However, we don't do that here for security + * reasons and compatibility with the original behavior. + */ + if (ifp->if_flags & IFF_SIMPLEX) { + if (m->m_flags & M_BCAST) { + struct mbuf *n = m_copy(m, 0, (int)M_COPYALL); + + ng_queue_data(hook, n, meta); + } else if (bcmp(eh->ether_dhost, + eh->ether_shost, ETHER_ADDR_LEN) == 0) { + ng_queue_data(hook, m, meta); + return (0); /* XXX */ + } + } + s = splimp(); + /* + * Queue message on interface, and start output if interface + * not yet active. + * XXX if we lookead at the priority in the meta data we could + * queue high priority items at the head. + */ + if (IF_QFULL(&ifp->if_snd)) { + IF_DROP(&ifp->if_snd); + splx(s); + senderr(ENOBUFS); + } + IF_ENQUEUE(&ifp->if_snd, m); + if ((ifp->if_flags & IFF_OACTIVE) == 0) + (*ifp->if_start)(ifp); + splx(s); + ifp->if_obytes += m->m_pkthdr.len; + if (m->m_flags & M_MCAST) + ifp->if_omcasts++; + return (error); + +bad: + NG_FREE_DATA(m, meta); + return (error); +} + +/* + * pass an mbuf out to the connected hook + * More complicated than just an m_prepend, as it tries to save later nodes + * from needing to do lots of m_pullups. + */ +static void +ngether_send(struct arpcom *ac, struct ether_header *eh, struct mbuf *m) +{ + int room; + node_p node = AC2NG(ac); + struct ether_header *eh2; + + if (node && LIST_FIRST(&(node->hooks))) { + /* + * Possibly the header is already on the front, + */ + eh2 = mtod(m, struct ether_header *) - 1; + if ( eh == eh2) { + /* + * This is the case so just move the markers back to + * re-include it. We lucked out. + * This allows us to avoid a yucky m_pullup + * in later nodes if it works. + */ + m->m_len += sizeof(*eh); + m->m_data -= sizeof(*eh); + m->m_pkthdr.len += sizeof(*eh); + } else { + /* + * Alternatively there may be room even though + * it is stored somewhere else. If so, copy it in. + * This only safe because we KNOW that this packet has + * just been generated by an ethernet card, so there + * are no aliases to the buffer. (unlike in outgoing + * packets). + * Nearly all ethernet cards will end up producing mbufs + * that fall into these cases. So we are not optimising + * contorted cases. + */ + + if (m->m_flags & M_EXT) { + room = (mtod(m, caddr_t) - m->m_ext.ext_buf); + if (room > m->m_ext.ext_size) /* garbage */ + room = 0; /* fail immediatly */ + } else { + room = (mtod(m, caddr_t) - m->m_pktdat); + } + if (room > sizeof (*eh)) { + /* we have room, just copy it and adjust */ + m->m_len += sizeof(*eh); + m->m_data -= sizeof(*eh); + m->m_pkthdr.len += sizeof(*eh); + } else { + /* + * Doing anything more is likely to get more + * expensive than it's worth.. + * it's probable that everything else is in one + * big lump. The next node will do an m_pullup() + * for exactly the amount of data it needs and + * hopefully everything after that will not + * need one. So let's just use M_PREPEND. + */ + M_PREPEND(m, sizeof (*eh), M_DONTWAIT); + if (m == NULL) + return; + } + bcopy ((caddr_t)eh, mtod(m, struct ether_header *), + sizeof(*eh)); + } + ng_queue_data(LIST_FIRST(&(node->hooks)), m, NULL); + } else { + m_freem(m); + } +} + +/* + * do local shutdown processing.. + * This node will refuse to go away, unless the hardware says to.. + * don't unref the node, or remove our name. just clear our links up. + */ +static int +ngether_rmnode(node_p node) +{ + ng_cutlinks(node); + node->flags &= ~NG_INVALID; /* bounce back to life */ + return (0); +} + +/* already linked */ +static int +ngether_connect(hook_p hook) +{ + /* be really amiable and just say "YUP that's OK by me! " */ + return (0); +} + +/* + * notify on hook disconnection (destruction) + * + * For this type, removal of the last lins no effect. The interface can run + * independently. + * Since we have no per-hook information, this is rather simple. + */ +static int +ngether_disconnect(hook_p hook) +{ + hook->node->flags &= ~NGEF_DIVERT; + return (0); +} +#endif /* NETGRAPH */ + +/********************************** END *************************************/ |
