/* * Copyright (c) 2000-2006 Apple Computer, Inc. All rights reserved. * * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. The rights granted to you under the License * may not be used to create, or enable the creation or redistribution of, * unlawful or unlicensed copies of an Apple operating system, or to * circumvent, violate, or enable the circumvention or violation of, any * terms of an Apple operating system software license agreement. * * Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ */ /* * 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. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* For M_LOOP */ #include #include /* #if INET #include #include #include #include #endif */ #include #include #include #include #include #if LLC && CCITT extern struct ifqueue pkintrq; #endif /* General stuff from if_ethersubr.c - may not need some of it */ #include #if NETAT extern struct ifqueue atalkintrq; #endif #if BRIDGE #include #endif #define memcpy(x,y,z) bcopy(y, x, z) SYSCTL_DECL(_net_link); SYSCTL_NODE(_net_link, IFT_ETHER, ether, CTLFLAG_RW|CTLFLAG_LOCKED, 0, "Ethernet"); struct en_desc { u_int16_t type; /* Type of protocol stored in data */ u_long protocol_family; /* Protocol family */ u_long data[2]; /* Protocol data */ }; /* descriptors are allocated in blocks of ETHER_DESC_BLK_SIZE */ #if CONFIG_EMBEDDED #define ETHER_DESC_BLK_SIZE (2) /* IP, ARP */ #else #define ETHER_DESC_BLK_SIZE (10) #endif /* * Header for the demux list, hangs off of IFP at family_cookie */ struct ether_desc_blk_str { u_long n_max_used; u_long n_count; u_long n_used; struct en_desc block_ptr[1]; }; /* Size of the above struct before the array of struct en_desc */ #define ETHER_DESC_HEADER_SIZE ((size_t)offsetof(struct ether_desc_blk_str, block_ptr)) __private_extern__ u_char etherbroadcastaddr[ETHER_ADDR_LEN] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }; static __inline__ int _ether_cmp(const void * a, const void * b) { const u_int16_t * a_s = (const u_int16_t *)a; const u_int16_t * b_s = (const u_int16_t *)b; if (a_s[0] != b_s[0] || a_s[1] != b_s[1] || a_s[2] != b_s[2]) { return (1); } return (0); } /* * Release all descriptor entries owned by this protocol (there may be several). * Setting the type to 0 releases the entry. Eventually we should compact-out * the unused entries. */ int ether_del_proto( ifnet_t ifp, protocol_family_t protocol_family) { struct ether_desc_blk_str *desc_blk = (struct ether_desc_blk_str *)ifp->family_cookie; u_long current = 0; int found = 0; if (desc_blk == NULL) return 0; for (current = desc_blk->n_max_used; current > 0; current--) { if (desc_blk->block_ptr[current - 1].protocol_family == protocol_family) { found = 1; desc_blk->block_ptr[current - 1].type = 0; desc_blk->n_used--; } } if (desc_blk->n_used == 0) { FREE(ifp->family_cookie, M_IFADDR); ifp->family_cookie = 0; } else { /* Decrement n_max_used */ for (; desc_blk->n_max_used > 0 && desc_blk->block_ptr[desc_blk->n_max_used - 1].type == 0; desc_blk->n_max_used--) ; } return 0; } static int ether_add_proto_internal( struct ifnet *ifp, protocol_family_t protocol, const struct ifnet_demux_desc *demux) { struct en_desc *ed; struct ether_desc_blk_str *desc_blk = (struct ether_desc_blk_str *)ifp->family_cookie; u_int32_t i; switch (demux->type) { /* These types are supported */ /* Top three are preferred */ case DLIL_DESC_ETYPE2: if (demux->datalen != 2) { return EINVAL; } break; case DLIL_DESC_SAP: if (demux->datalen != 3) { return EINVAL; } break; case DLIL_DESC_SNAP: if (demux->datalen != 5) { return EINVAL; } break; default: return ENOTSUP; } // Verify a matching descriptor does not exist. if (desc_blk != NULL) { switch (demux->type) { case DLIL_DESC_ETYPE2: for (i = 0; i < desc_blk->n_max_used; i++) { if (desc_blk->block_ptr[i].type == DLIL_DESC_ETYPE2 && desc_blk->block_ptr[i].data[0] == *(u_int16_t*)demux->data) { return EADDRINUSE; } } break; case DLIL_DESC_SAP: case DLIL_DESC_SNAP: for (i = 0; i < desc_blk->n_max_used; i++) { if (desc_blk->block_ptr[i].type == demux->type && bcmp(desc_blk->block_ptr[i].data, demux->data, demux->datalen) == 0) { return EADDRINUSE; } } break; } } // Check for case where all of the descriptor blocks are in use if (desc_blk == NULL || desc_blk->n_used == desc_blk->n_count) { struct ether_desc_blk_str *tmp; u_long new_count = ETHER_DESC_BLK_SIZE; u_long new_size; u_long old_size = 0; i = 0; if (desc_blk) { new_count += desc_blk->n_count; old_size = desc_blk->n_count * sizeof(struct en_desc) + ETHER_DESC_HEADER_SIZE; i = desc_blk->n_used; } new_size = new_count * sizeof(struct en_desc) + ETHER_DESC_HEADER_SIZE; tmp = _MALLOC(new_size, M_IFADDR, M_WAITOK); if (tmp == 0) { /* * Remove any previous descriptors set in the call. */ return ENOMEM; } bzero(((char *)tmp) + old_size, new_size - old_size); if (desc_blk) { bcopy(desc_blk, tmp, old_size); FREE(desc_blk, M_IFADDR); } desc_blk = tmp; ifp->family_cookie = (u_long)desc_blk; desc_blk->n_count = new_count; } else { /* Find a free entry */ for (i = 0; i < desc_blk->n_count; i++) { if (desc_blk->block_ptr[i].type == 0) { break; } } } /* Bump n_max_used if appropriate */ if (i + 1 > desc_blk->n_max_used) { desc_blk->n_max_used = i + 1; } ed = &desc_blk->block_ptr[i]; ed->protocol_family = protocol; ed->data[0] = 0; ed->data[1] = 0; switch (demux->type) { case DLIL_DESC_ETYPE2: /* 2 byte ethernet raw protocol type is at native_type */ /* prtocol must be in network byte order */ ed->type = DLIL_DESC_ETYPE2; ed->data[0] = *(u_int16_t*)demux->data; break; case DLIL_DESC_SAP: ed->type = DLIL_DESC_SAP; bcopy(demux->data, &ed->data[0], 3); break; case DLIL_DESC_SNAP: { u_int8_t* pDest = ((u_int8_t*)&ed->data[0]) + 3; ed->type = DLIL_DESC_SNAP; bcopy(demux->data, pDest, 5); } break; } desc_blk->n_used++; return 0; } int ether_add_proto( ifnet_t ifp, protocol_family_t protocol, const struct ifnet_demux_desc *demux_list, u_int32_t demux_count) { int error = 0; u_int32_t i; for (i = 0; i < demux_count; i++) { error = ether_add_proto_internal(ifp, protocol, &demux_list[i]); if (error) { ether_del_proto(ifp, protocol); break; } } return error; } int ether_demux( ifnet_t ifp, mbuf_t m, char *frame_header, protocol_family_t *protocol_family) { struct ether_header *eh = (struct ether_header *)frame_header; u_short ether_type = eh->ether_type; u_int16_t type; u_int8_t *data; u_long i = 0; struct ether_desc_blk_str *desc_blk = (struct ether_desc_blk_str *)ifp->family_cookie; u_long maxd = desc_blk ? desc_blk->n_max_used : 0; struct en_desc *ed = desc_blk ? desc_blk->block_ptr : NULL; u_int32_t extProto1 = 0; u_int32_t extProto2 = 0; if (eh->ether_dhost[0] & 1) { /* Check for broadcast */ if (_ether_cmp(etherbroadcastaddr, eh->ether_dhost) == 0) m->m_flags |= M_BCAST; else m->m_flags |= M_MCAST; } if (ifp->if_eflags & IFEF_BOND) { /* if we're bonded, bond "protocol" gets all the packets */ *protocol_family = PF_BOND; return (0); } if ((eh->ether_dhost[0] & 1) == 0) { /* * When the driver is put into promiscuous mode we may receive unicast * frames that are not intended for our interfaces. They are marked here * as being promiscuous so the caller may dispose of them after passing * the packets to any interface filters. */ if (_ether_cmp(eh->ether_dhost, ifnet_lladdr(ifp))) { m->m_flags |= M_PROMISC; } } /* check for VLAN */ if ((m->m_pkthdr.csum_flags & CSUM_VLAN_TAG_VALID) != 0) { if (EVL_VLANOFTAG(m->m_pkthdr.vlan_tag) != 0) { *protocol_family = PF_VLAN; return (0); } /* the packet is just priority-tagged, clear the bit */ m->m_pkthdr.csum_flags &= ~CSUM_VLAN_TAG_VALID; } else if (ether_type == htons(ETHERTYPE_VLAN)) { struct ether_vlan_header * evl; evl = (struct ether_vlan_header *)frame_header; if (m->m_len < ETHER_VLAN_ENCAP_LEN || ntohs(evl->evl_proto) == ETHERTYPE_VLAN || EVL_VLANOFTAG(ntohs(evl->evl_tag)) != 0) { *protocol_family = PF_VLAN; return 0; } /* the packet is just priority-tagged */ /* make the encapsulated ethertype the actual ethertype */ ether_type = evl->evl_encap_proto = evl->evl_proto; /* remove the encapsulation header */ m->m_len -= ETHER_VLAN_ENCAP_LEN; m->m_data += ETHER_VLAN_ENCAP_LEN; m->m_pkthdr.len -= ETHER_VLAN_ENCAP_LEN; m->m_pkthdr.csum_flags = 0; /* can't trust hardware checksum */ } data = mtod(m, u_int8_t*); /* * Determine the packet's protocol type and stuff the protocol into * longs for quick compares. */ if (ntohs(ether_type) <= 1500) { extProto1 = *(u_int32_t*)data; // SAP or SNAP if ((extProto1 & htonl(0xFFFFFF00)) == htonl(0xAAAA0300)) { // SNAP type = DLIL_DESC_SNAP; extProto2 = *(u_int32_t*)(data + sizeof(u_int32_t)); extProto1 &= htonl(0x000000FF); } else { type = DLIL_DESC_SAP; extProto1 &= htonl(0xFFFFFF00); } } else { type = DLIL_DESC_ETYPE2; } /* * Search through the connected protocols for a match. */ switch (type) { case DLIL_DESC_ETYPE2: for (i = 0; i < maxd; i++) { if ((ed[i].type == type) && (ed[i].data[0] == ether_type)) { *protocol_family = ed[i].protocol_family; return 0; } } break; case DLIL_DESC_SAP: for (i = 0; i < maxd; i++) { if ((ed[i].type == type) && (ed[i].data[0] == extProto1)) { *protocol_family = ed[i].protocol_family; return 0; } } break; case DLIL_DESC_SNAP: for (i = 0; i < maxd; i++) { if ((ed[i].type == type) && (ed[i].data[0] == extProto1) && (ed[i].data[1] == extProto2)) { *protocol_family = ed[i].protocol_family; return 0; } } break; } return ENOENT; } /* * 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. */ int ether_frameout( struct ifnet *ifp, struct mbuf **m, const struct sockaddr *ndest, const char *edst, const char *ether_type) { struct ether_header *eh; int hlen; /* link layer header length */ hlen = ETHER_HDR_LEN; /* * 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) && ((*m)->m_flags & M_LOOP)) { if (lo_ifp) { if ((*m)->m_flags & M_BCAST) { struct mbuf *n = m_copy(*m, 0, (int)M_COPYALL); if (n != NULL) dlil_output(lo_ifp, ndest->sa_family, n, NULL, ndest, 0); } else { if (_ether_cmp(edst, ifnet_lladdr(ifp)) == 0) { dlil_output(lo_ifp, ndest->sa_family, *m, NULL, ndest, 0); return EJUSTRETURN; } } } } /* * Add local net header. If no space in first mbuf, * allocate another. */ M_PREPEND(*m, sizeof (struct ether_header), M_DONTWAIT); if (*m == 0) { return (EJUSTRETURN); } eh = mtod(*m, struct ether_header *); (void)memcpy(&eh->ether_type, ether_type, sizeof(eh->ether_type)); (void)memcpy(eh->ether_dhost, edst, ETHER_ADDR_LEN); ifnet_lladdr_copy_bytes(ifp, eh->ether_shost, ETHER_ADDR_LEN); return 0; } errno_t ether_check_multi( __unused ifnet_t ifp, const struct sockaddr *proto_addr) { errno_t result = EAFNOSUPPORT; const u_char *e_addr; /* * AF_SPEC and AF_LINK don't require translation. We do * want to verify that they specify a valid multicast. */ switch(proto_addr->sa_family) { case AF_UNSPEC: e_addr = (const u_char*)&proto_addr->sa_data[0]; if ((e_addr[0] & 0x01) != 0x01) result = EADDRNOTAVAIL; else result = 0; break; case AF_LINK: e_addr = CONST_LLADDR((const struct sockaddr_dl*)proto_addr); if ((e_addr[0] & 0x01) != 0x01) result = EADDRNOTAVAIL; else result = 0; break; } return result; } int ether_ioctl( __unused ifnet_t ifp, __unused u_int32_t command, __unused void* data) { return EOPNOTSUPP; } __private_extern__ int ether_family_init(void) { errno_t error = 0; /* Register protocol registration functions */ if ((error = proto_register_plumber(PF_INET, APPLE_IF_FAM_ETHERNET, ether_attach_inet, ether_detach_inet)) != 0) { printf("proto_register_plumber failed for PF_INET error=%d\n", error); goto done; } #if INET6 if ((error = proto_register_plumber(PF_INET6, APPLE_IF_FAM_ETHERNET, ether_attach_inet6, ether_detach_inet6)) != 0) { printf("proto_register_plumber failed for PF_INET6 error=%d\n", error); goto done; } #endif /* INET6 */ #if NETAT if ((error = proto_register_plumber(PF_APPLETALK, APPLE_IF_FAM_ETHERNET, ether_attach_at, ether_detach_at)) != 0) { printf("proto_register_plumber failed PF_APPLETALK error=%d\n", error); goto done; } #endif /* NETAT */ #if VLAN vlan_family_init(); #endif /* VLAN */ #if BOND bond_family_init(); #endif /* BOND */ done: return (error); }