1 /* 2 * Copyright (C) Dirk Husemann, Computer Science Department IV, 3 * University of Erlangen-Nuremberg, Germany, 1990, 1991, 1992 4 * Copyright (c) 1992 Regents of the University of California. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Dirk Husemann and the Computer Science Department (IV) of 9 * the University of Erlangen-Nuremberg, Germany. 10 * 11 * %sccs.include.redist.c% 12 * 13 * @(#)pk_llcsubr.c 7.1 (Berkeley) 12/08/92 14 */ 15 16 #include <sys/param.h> 17 #include <sys/systm.h> 18 #include <sys/mbuf.h> 19 #include <sys/domain.h> 20 #include <sys/socket.h> 21 #include <sys/socketvar.h> 22 #include <sys/protosw.h> 23 #include <sys/errno.h> 24 #include <sys/time.h> 25 #include <sys/kernel.h> 26 27 #include <net/if.h> 28 #include <net/if_dl.h> 29 #include <net/if_llc.h> 30 #include <net/if_types.h> 31 #include <net/route.h> 32 33 #include <netccitt/dll.h> 34 #include <netccitt/x25.h> 35 #include <netccitt/pk.h> 36 #include <netccitt/pk_var.h> 37 #include <netccitt/llc_var.h> 38 39 40 /* 41 * Routing support for X.25 42 * 43 * We distinguish between two cases: 44 * RTF_HOST: 45 * rt_key(rt) X.25 address of host 46 * rt_gateway SNPA (MAC+DLSAP) address of host 47 * rt_llinfo pkcb for rt_key(rt) 48 * 49 * RTF_GATEWAY 50 * rt_key(rt) X.25 address of host or suitably masked network 51 * rt_gateway X.25 address of next X.25 gateway (switch) 52 * rt_llinfo rtentry for rt_gateway address 53 * ought to be of type RTF_HOST 54 * 55 * 56 * Mapping of X.121 to pkcbs: 57 * 58 * HDLC uses the DTE-DCE model of X.25, therefore we need a many-to-one 59 * relationship, i.e.: 60 * 61 * {X.121_a, X.121_b, X.121_c, ..., X.121_i} -> pkcb_0 62 * 63 * LLC2 utilizes the DTE-DTE model of X.25, resulting effectively in a 64 * one-to-one relationship, i.e.: 65 * 66 * {X.121_j} -> pkcb_1a 67 * {X.121_k} -> pkcb_1b 68 * ... 69 * {X.121_q} -> pkcb_1q 70 * 71 * It might make sense to allow a many-to-one relation for LLC2 also, 72 * 73 * {X.121_r, X.121_s, X.121_t, X.121_u} -> pkcb_2a 74 * 75 * This would make addresses X.121_[r-u] essentially aliases of one 76 * address ({X.121_[r-u]} would constitute a representative set). 77 * 78 * Each one-to-one relation must obviously be entered individually with 79 * a route add command, whereas a many-to-one relationship can be 80 * either entered individually or generated by using a netmask. 81 * 82 * To facilitate dealings the many-to-one case for LLC2 can only be 83 * established via a netmask. 84 * 85 */ 86 87 #define XTRACTPKP(rt) ((rt)->rt_flags & RTF_GATEWAY ? \ 88 ((rt)->rt_llinfo ? \ 89 (struct pkcb *) ((struct rtentry *)((rt)->rt_llinfo))->rt_llinfo : \ 90 (struct pkcb *) NULL) : \ 91 (struct pkcb *)((rt)->rt_llinfo)) 92 93 #define equal(a1, a2) (bcmp((caddr_t)(a1), \ 94 (caddr_t)(a2), \ 95 (a1)->sa_len) == 0) 96 #define XIFA(rt) ((struct x25_ifaddr *)((rt)->rt_ifa)) 97 98 int 99 cons_rtrequest(int cmd, struct rtentry *rt, struct sockaddr *dst) 100 { 101 register struct pkcb *pkp; 102 register int i; 103 register char one_to_one; 104 struct pkcb *pk_newlink(); 105 struct rtentry *npaidb_enter(); 106 107 pkp = XTRACTPKP(rt); 108 109 switch(cmd) { 110 case RTM_RESOLVE: 111 case RTM_ADD: 112 if (pkp) 113 return(EEXIST); 114 115 if (rt->rt_flags & RTF_GATEWAY) { 116 if (rt->rt_llinfo) 117 RTFREE((struct rtentry *)rt->rt_llinfo); 118 rt->rt_llinfo = (caddr_t) rtalloc1(rt->rt_gateway, 1); 119 return(0); 120 } 121 /* 122 * Assumptions: (1) ifnet structure is filled in 123 * (2) at least the pkcb created via 124 * x25config (ifconfig?) has been 125 * set up already. 126 * (3) HDLC interfaces have an if_type of 127 * IFT_X25{,DDN}, LLC2 interfaces 128 * anything else (any better way to 129 * do this?) 130 * 131 */ 132 if (!rt->rt_ifa) 133 return (ENETDOWN); 134 135 /* 136 * We differentiate between dealing with a many-to-one 137 * (HDLC: DTE-DCE) and a one-to-one (LLC2: DTE-DTE) 138 * relationship (by looking at the if type). 139 * 140 * Only in case of the many-to-one relationship (HDLC) 141 * we set the ia->ia_pkcb pointer to the pkcb allocated 142 * via pk_newlink() as we will use just that one pkcb for 143 * future route additions (the rtentry->rt_llinfo pointer 144 * points to the pkcb allocated for that route). 145 * 146 * In case of the one-to-one relationship (LLC2) we 147 * create a new pkcb (via pk_newlink()) for each new rtentry. 148 * 149 * NOTE: Only in case of HDLC does ia->ia_pkcb point 150 * to a pkcb, in the LLC2 case it doesn't (as we don't 151 * need it here)! 152 */ 153 one_to_one = ISISO8802(rt->rt_ifp); 154 155 if (!(pkp = XIFA(rt)->ia_pkcb) && !one_to_one) 156 XIFA(rt)->ia_pkcb = pkp = 157 pk_newlink(XIFA(rt), (caddr_t) 0); 158 else if (one_to_one && 159 !equal(rt->rt_gateway, rt->rt_ifa->ifa_addr)) { 160 pkp = pk_newlink(XIFA(rt), (caddr_t) 0); 161 /* 162 * We also need another route entry for mapping 163 * MAC+LSAP->X.25 address 164 */ 165 pkp->pk_llrt = npaidb_enter(rt->rt_gateway, rt_key(rt), rt, 0); 166 } 167 if (pkp) { 168 if (!pkp->pk_rt) 169 pkp->pk_rt = rt; 170 pkp->pk_refcount++; 171 } 172 rt->rt_llinfo = (caddr_t) pkp; 173 174 return(0); 175 176 case RTM_DELETE: 177 { 178 /* 179 * The pkp might be empty if we are dealing 180 * with an interface route entry for LLC2, in this 181 * case we don't need to do anything ... 182 */ 183 if (pkp) { 184 if ( rt->rt_flags & RTF_GATEWAY ) { 185 if (rt->rt_llinfo) 186 RTFREE((struct rtentry *)rt->rt_llinfo); 187 return(0); 188 } 189 190 if (pkp->pk_llrt) 191 npaidb_destroy(pkp->pk_llrt); 192 193 pk_dellink (pkp); 194 195 return(0); 196 } 197 } 198 } 199 } 200 201 202 /* 203 * Glue between X.25 and LLC2 204 */ 205 int 206 x25_llcglue(int prc, struct sockaddr *addr) 207 { 208 register struct sockaddr_x25 *sx25 = (struct sockaddr_x25 *)addr; 209 register struct x25_ifaddr *x25ifa; 210 struct dll_ctlinfo ctlinfo; 211 212 if((x25ifa = (struct x25_ifaddr *)ifa_ifwithaddr(addr)) == 0) 213 return 0; 214 215 ctlinfo.dlcti_cfg = 216 (struct dllconfig *)(((struct sockaddr_x25 *)(&x25ifa->ia_xc))+1); 217 ctlinfo.dlcti_lsap = LLC_X25_LSAP; 218 219 return ((int)llc_ctlinput(prc, addr, (caddr_t)&ctlinfo)); 220 } 221