/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2009 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * Copyright 2019 Joyent, Inc. */ #ifndef _INET_IP_NDP_H #define _INET_IP_NDP_H #include #include #include #include #include #include /* * Internal definitions for the kernel implementation of the IPv6 * Neighbor Discovery Protocol (NDP) and Address Resolution Protocol (ARP). */ #ifdef __cplusplus extern "C" { #endif #ifdef _KERNEL #define NCE_TABLE_SIZE 256 /* * callbacks set up with ip2mac interface, waiting for result * of neighbor resolution. */ typedef struct ncec_cb_s { list_node_t ncec_cb_node; /* next entry in list */ void *ncec_cb_id; uint32_t ncec_cb_flags; ip2mac_callback_t *ncec_cb_func; void *ncec_cb_arg; } ncec_cb_t; #define NCE_CB_DISPATCHED 0x00000001 /* * Core information tracking Neighbor Reachability is tracked in the * ncec_s/ncec_t. The information contained in the ncec_t does not contain * any link-specific details other than the pointer to the ill_t itself. * The link-specific information is tracked in the nce_t structure. */ struct ncec_s { struct ncec_s *ncec_next; /* Hash chain next pointer */ struct ncec_s **ncec_ptpn; /* Pointer to previous next */ struct ill_s *ncec_ill; /* Associated ill */ uint16_t ncec_flags; /* See below */ uint16_t ncec_state; /* See reachability states in if.h */ int16_t ncec_pcnt; /* Probe counter */ uint16_t ncec_rcnt; /* Retransmit counter */ in6_addr_t ncec_addr; /* address of the nighbor */ uchar_t *ncec_lladdr; mblk_t *ncec_qd_mp; /* Head outgoing queued packets */ uint64_t ncec_last; /* Time last reachable in msec */ uint32_t ncec_refcnt; /* ncec active usage count */ kmutex_t ncec_lock; /* See comments on top for what */ /* this field protects */ int ncec_unsolicit_count; /* Unsolicited Adv count */ timeout_id_t ncec_timeout_id; uchar_t ncec_ipversion; /* IPv4(ARP)/IPv6(NDP) version */ uint_t ncec_defense_count; /* number of NDP conflicts */ clock_t ncec_last_time_defended; /* defended last (ticks) */ uint64_t ncec_init_time; /* time when it was set to ND_INITIAL */ boolean_t ncec_trace_disable; /* True when alloc fails */ /* * interval to keep track of DAD probes. */ clock_t ncec_xmit_interval; ip_stack_t *ncec_ipst; /* Does not have a netstack_hold */ list_t ncec_cb; /* callbacks waiting for resolution */ uint_t ncec_cb_walker_cnt; uint_t ncec_nprobes; uint_t ncec_lladdr_length; }; /* * The nce_t list hangs off the ill_s and tracks information that depends * on the underlying physical link. Thus when the ill goes down, * the nce_t list has to be flushed. This is done as part of ill_delete() * * When the fastpath ack comes back in ill_fastpath_ack we call * nce_fastpath_update to update the nce_t. We never actually * flush the fastpath list, which is kept as an index into the * ncec_t structures. * * when we ndp_delete, we remove the nce entries pointing * at the dying ncec from the ill_fastpath_list chain. * */ struct nce_s { list_node_t nce_node; ill_t *nce_ill; boolean_t nce_is_condemned; in6_addr_t nce_addr; /* * link-layer specific fields below */ mblk_t *nce_dlur_mp; /* DL_UNITDATA_REQ mp */ mblk_t *nce_fp_mp; /* fast path mp */ struct ncec_s *nce_common; kmutex_t nce_lock; uint32_t nce_refcnt; uint_t nce_ipif_cnt; /* number of ipifs with the nce_addr */ /* as their local address */ }; /* * The ndp_g_t structure contains protocol specific information needed * to synchronize and manage neighbor cache entries for IPv4 and IPv6. * There are 2 such structures, ips_ndp4 and ips_ndp6. * ips_ndp6 contains the data structures needed for IPv6 Neighbor Discovery. * ips_ndp4 contains the data structures for IPv4 ARP. * * Locking notes: * ndp_g_lock protects neighbor cache tables access and * insertion/removal of cache entries into/from these tables. The ncec_lock * and nce_lock protect fields in the ncec_t and nce_t structures. * Should there be a need to obtain nce[c]_lock and ndp_g_lock, ndp_g_lock is * acquired first. */ typedef struct ndp_g_s { kmutex_t ndp_g_lock; /* Lock protecting cache hash table */ ncec_t *nce_hash_tbl[NCE_TABLE_SIZE]; int ndp_g_walker; /* # of active thread walking hash list */ boolean_t ndp_g_walker_cleanup; /* true implies defer deletion. */ } ndp_g_t; /* ncec_flags */ #define NCE_F_MYADDR 0x1 /* ipif exists for the ncec_addr */ #define NCE_F_UNVERIFIED 0x2 /* DAD in progress. */ #define NCE_F_ISROUTER 0x4 #define NCE_F_FAST 0x8 /* * NCE_F_NONUD is used to disable IPv6 Neighbor Unreachability Detection or * IPv4 aging and maps to the ATF_PERM flag for arp(1m) */ #define NCE_F_NONUD 0x10 #define NCE_F_ANYCAST 0x20 #define NCE_F_CONDEMNED 0x40 #define NCE_F_UNSOL_ADV 0x80 #define NCE_F_BCAST 0x100 #define NCE_F_MCAST 0x200 /* * NCE_F_PUBLISH is set for all ARP/ND entries that we announce. This * includes locally configured addresses as well as those that we proxy for. */ #define NCE_F_PUBLISH 0x400 /* * NCE_F_AUTHORITY is set for any address that we have authoritatitve * information for. This includes locally configured addresses as well * as statically configured arp entries that are set up using the "permanent" * option described in arp(1m). The NCE_F_AUTHORITY asserts that we would * reject any updates for that nce's (host, link-layer-address) information */ #define NCE_F_AUTHORITY 0x800 #define NCE_F_DELAYED 0x1000 /* rescheduled on dad_defend_rate */ #define NCE_F_STATIC 0x2000 /* State REACHABLE, STALE, DELAY or PROBE */ #define NCE_ISREACHABLE(ncec) \ (((((ncec)->ncec_state) >= ND_REACHABLE) && \ ((ncec)->ncec_state) <= ND_PROBE)) #define NCE_ISCONDEMNED(ncec) ((ncec)->ncec_flags & NCE_F_CONDEMNED) /* NDP flags set in SOL/ADV requests */ #define NDP_UNICAST 0x1 #define NDP_ISROUTER 0x2 #define NDP_SOLICITED 0x4 #define NDP_ORIDE 0x8 #define NDP_PROBE 0x10 /* Number of packets queued in NDP for a neighbor */ #define ND_MAX_Q 4 /* * Structure for nce_update_hw_changed; */ typedef struct { ipaddr_t hwm_addr; /* IPv4 address */ uint_t hwm_hwlen; /* Length of hardware address (may be 0) */ uchar_t *hwm_hwaddr; /* Pointer to new hardware address, if any */ int hwm_flags; } nce_hw_map_t; /* When SAP is greater than zero address appears before SAP */ #define NCE_LL_ADDR_OFFSET(ill) (((ill)->ill_sap_length) < 0 ? \ (sizeof (dl_unitdata_req_t)) : \ ((sizeof (dl_unitdata_req_t)) + (ABS((ill)->ill_sap_length)))) #define NCE_LL_SAP_OFFSET(ill) (((ill)->ill_sap_length) < 0 ? \ ((sizeof (dl_unitdata_req_t)) + ((ill)->ill_phys_addr_length)) : \ (sizeof (dl_unitdata_req_t))) #define NCE_MYADDR(ncec) (((ncec)->ncec_flags & NCE_F_MYADDR) != 0) /* * NCE_PUBLISH() identifies the addresses that we are publishing. This * includes locally configured address (NCE_MYADDR()) as well as those that * we are proxying. */ #define NCE_PUBLISH(ncec) ((ncec->ncec_flags & NCE_F_PUBLISH) != 0) #ifdef _BIG_ENDIAN #define NCE_LL_SAP_COPY(ill, mp) \ { \ size_t abs_sap_len = ABS((ill)->ill_sap_length); \ if (abs_sap_len > 0) { \ ASSERT(abs_sap_len <= sizeof (uint32_t)); \ ASSERT((mp)->b_rptr + NCE_LL_SAP_OFFSET(ill) + \ abs_sap_len <= ((mp)->b_wptr)); \ bcopy((uint8_t *)&(ill)->ill_sap + sizeof (ill->ill_sap) - \ abs_sap_len, \ ((mp)->b_rptr + NCE_LL_SAP_OFFSET(ill)), \ abs_sap_len); \ } \ } #else #define NCE_LL_SAP_COPY(ill, mp) \ { \ size_t abs_sap_len = ABS((ill)->ill_sap_length); \ if (abs_sap_len > 0) { \ uint32_t abs_sap_len = ABS((ill)->ill_sap_length); \ ASSERT(abs_sap_len <= sizeof (uint32_t)); \ ASSERT((mp)->b_rptr + NCE_LL_SAP_OFFSET(ill) + \ abs_sap_len <= ((mp)->b_wptr)); \ bcopy(&((ill)->ill_sap), \ ((mp)->b_rptr + NCE_LL_SAP_OFFSET(ill)), \ abs_sap_len); \ } \ } #endif /* * Exclusive-or the 6 bytes that are likely to contain the MAC * address. Assumes table_size does not exceed 256. * Assumes EUI-64 format for good hashing. */ #define NCE_ADDR_HASH_V6(addr, table_size) \ (((addr).s6_addr8[8] ^ (addr).s6_addr8[9] ^ \ (addr).s6_addr8[10] ^ (addr).s6_addr8[13] ^ \ (addr).s6_addr8[14] ^ (addr).s6_addr8[15]) % (table_size)) /* NDP Cache Entry Hash Table */ #define NCE_TABLE_SIZE 256 extern void ip_nce_reclaim(void *); extern void ncec_delete(ncec_t *); extern void ncec_delete_per_ill(ncec_t *, uchar_t *); extern void nce_fastpath_update(ill_t *, mblk_t *); extern nd_opt_hdr_t *ndp_get_option(nd_opt_hdr_t *, int, int); extern void ncec_inactive(ncec_t *); extern void ndp_input(mblk_t *, ip_recv_attr_t *); extern ncec_t *ncec_lookup_illgrp_v6(ill_t *, const in6_addr_t *); extern ncec_t *ncec_lookup_illgrp_v4(ill_t *, const in_addr_t *); extern nce_t *nce_lookup_v4(ill_t *, const in_addr_t *); extern nce_t *nce_lookup_v6(ill_t *, const in6_addr_t *); extern void nce_make_unreachable(ncec_t *); extern mblk_t *ndp_mcastreq(ill_t *, const in6_addr_t *, uint32_t, uint32_t, mblk_t *); extern nce_t *ndp_nce_init(ill_t *, const in6_addr_t *, int); extern void nce_process(ncec_t *, uchar_t *, uint32_t, boolean_t); extern int ndp_query(ill_t *, lif_nd_req_t *); extern int ndp_sioc_update(ill_t *, lif_nd_req_t *); extern boolean_t ndp_verify_optlen(nd_opt_hdr_t *, int); extern void nce_timer(void *); extern void ncec_walk(ill_t *, pfi_t, void *, ip_stack_t *); extern void ncec_walk_common(ndp_g_t *, ill_t *, pfi_t, void *, boolean_t); extern boolean_t nce_restart_dad(ncec_t *); extern void ndp_resolv_failed(ncec_t *); extern void arp_resolv_failed(ncec_t *); extern void nce_fastpath_list_delete(ill_t *, ncec_t *, list_t *); extern void nce_queue_mp(ncec_t *, mblk_t *, boolean_t); extern void nce_update_hw_changed(ncec_t *, void *); extern int nce_lookup_then_add_v6(ill_t *, uchar_t *, uint_t, const in6_addr_t *, uint16_t, uint16_t, nce_t **); extern int nce_lookup_then_add_v4(ill_t *, uchar_t *, uint_t, const in_addr_t *, uint16_t, uint16_t, nce_t **); extern boolean_t nce_cmp_ll_addr(const ncec_t *, const uchar_t *, uint32_t); extern void nce_update(ncec_t *, uint16_t, uchar_t *); extern nce_t *nce_lookup_mapping(ill_t *, const in6_addr_t *); extern void nce_restart_timer(ncec_t *, uint_t); extern void ncec_refrele(ncec_t *); extern void ncec_refhold(ncec_t *); extern void ncec_refrele_notr(ncec_t *); extern void ncec_refhold_notr(ncec_t *); extern void nce_resolv_ok(ncec_t *); extern uint32_t ndp_solicit(ncec_t *, in6_addr_t, ill_t *); extern boolean_t ip_nce_conflict(mblk_t *, ip_recv_attr_t *, ncec_t *); extern boolean_t ndp_announce(ncec_t *); extern void ip_nce_lookup_and_update(ipaddr_t *, ipif_t *, ip_stack_t *, uchar_t *, int, int); extern void nce_refrele(nce_t *); extern void nce_refhold(nce_t *); extern void nce_delete(nce_t *); extern void nce_flush(ill_t *, boolean_t); extern void nce_walk(ill_t *, pfi_t, void *); extern void ip_ndp_resolve(struct ncec_s *); extern void ip_addr_recover(ipsq_t *, queue_t *, mblk_t *, void *); #ifdef DEBUG extern void nce_trace_ref(ncec_t *); extern void nce_untrace_ref(ncec_t *); #endif #endif /* _KERNEL */ #ifdef __cplusplus } #endif #endif /* _INET_IP_NDP_H */