1 /* 2 * Copyright (c) 1992 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)tuba_subr.c 7.7 (Berkeley) 11/05/92 8 */ 9 10 #include <sys/param.h> 11 #include <sys/proc.h> 12 #include <sys/systm.h> 13 #include <sys/malloc.h> 14 #include <sys/mbuf.h> 15 #include <sys/socket.h> 16 #include <sys/socketvar.h> 17 #include <sys/protosw.h> 18 #include <sys/errno.h> 19 20 #include <net/route.h> 21 #include <net/if.h> 22 23 #include <netinet/in.h> 24 #include <netinet/in_systm.h> 25 #include <netinet/ip.h> 26 #include <netinet/in_pcb.h> 27 #include <netinet/ip_var.h> 28 #include <netinet/ip_icmp.h> 29 #include <netinet/tcp.h> 30 #include <netinet/tcp_fsm.h> 31 #include <netinet/tcp_seq.h> 32 #include <netinet/tcp_timer.h> 33 #include <netinet/tcp_var.h> 34 #include <netinet/tcpip.h> 35 #include <netinet/tcp_debug.h> 36 37 #include <netiso/argo_debug.h> 38 #include <netiso/iso.h> 39 #include <netiso/clnp.h> 40 #include <netiso/iso_pcb.h> 41 #include <netiso/iso_var.h> 42 #include <netiso/tuba_table.h> 43 44 static struct sockaddr_iso null_siso = { sizeof(null_siso), AF_ISO, }; 45 extern int tuba_table_size; 46 extern int tcppcbcachemiss, tcppredack, tcppreddat, tcprexmtthresh; 47 extern struct tcpiphdr tcp_saveti; 48 struct inpcb *tuba_last_inpcb; 49 struct inpcb tuba_inpcb; 50 struct isopcb tuba_isopcb; 51 /* 52 * Tuba initialization 53 */ 54 tuba_init() 55 { 56 #define TUBAHDRSIZE (3 /*LLC*/ + 9 /*CLNP Fixed*/ + 42 /*Addresses*/ \ 57 + 6 /*CLNP Segment*/ + 20 /*TCP*/) 58 59 tuba_inpcb.inp_next = tuba_inpcb.inp_prev = &tuba_inpcb; 60 tuba_isopcb.isop_next = tuba_isopcb.isop_prev = &tuba_isopcb; 61 tuba_isopcb.isop_faddr = &tuba_isopcb.isop_sfaddr; 62 tuba_isopcb.isop_laddr = &tuba_isopcb.isop_sladdr; 63 if (max_protohdr < TUBAHDRSIZE) 64 max_protohdr = TUBAHDRSIZE; 65 if (max_linkhdr + TUBAHDRSIZE > MHLEN) 66 panic("tuba_init"); 67 } 68 69 static void 70 tuba_getaddr(error, sum, siso, index) 71 int *error; 72 register u_long *sum; 73 struct sockaddr_iso *siso; 74 u_long index; 75 { 76 register struct tuba_cache *tc; 77 if (index <= tuba_table_size && (tc = tuba_table[index])) { 78 if (siso) { 79 *siso = null_siso; 80 siso->siso_addr = tc->tc_addr; 81 } 82 REDUCE(*sum, *sum + tc->tc_sum_out); 83 } else 84 *error = 1; 85 } 86 87 tuba_output(m, tp) 88 register struct mbuf *m; 89 struct tcpcb *tp; 90 { 91 struct isopcb *isop; 92 register struct tcpiphdr *n; 93 u_long sum, i; 94 95 if (tp == 0 || (n = tp->t_template) == 0 || 96 (isop = (struct isopcb *)tp->t_tuba_pcb) == 0) { 97 isop = &tuba_isopcb; 98 n = mtod(m, struct tcpiphdr *); 99 i = sum = 0; 100 tuba_getaddr(&i, &sum, tuba_isopcb.isop_faddr, 101 n->ti_dst.s_addr); 102 tuba_getaddr(&i, &sum, tuba_isopcb.isop_laddr, 103 n->ti_src.s_addr); 104 goto adjust; 105 } 106 if (n->ti_sum == 0) { 107 i = sum = 0; 108 tuba_getaddr(&i, &sum, (struct sockaddr_iso *)0, 109 n->ti_dst.s_addr); 110 tuba_getaddr(&i, &sum, (struct sockaddr_iso *)0, 111 n->ti_src.s_addr); 112 n->ti_sum = sum; 113 n = mtod(m, struct tcpiphdr *); 114 adjust: 115 if (i) { 116 m_freem(m); 117 return (EADDRNOTAVAIL); 118 } 119 REDUCE(n->ti_sum, n->ti_sum + (0xffff ^ sum)); 120 } 121 m->m_len -= sizeof (struct ip); 122 m->m_pkthdr.len -= sizeof (struct ip); 123 m->m_data += sizeof (struct ip); 124 return (clnp_output(m, isop, m->m_pkthdr.len, 0)); 125 } 126 127 128 tuba_refcnt(isop, delta) 129 struct isopcb *isop; 130 { 131 register struct tuba_cache *tc; 132 unsigned index, sum; 133 134 if (delta != 1) 135 delta = -1; 136 if (isop == 0 || isop->isop_faddr == 0 || isop->isop_laddr == 0 || 137 (delta == -1 && isop->isop_tuba_cached == 0) || 138 (delta == 1 && isop->isop_tuba_cached != 0)) 139 return; 140 isop->isop_tuba_cached = (delta == 1); 141 if ((index = tuba_lookup(&isop->isop_sfaddr.siso_addr, M_DONTWAIT)) != 0 && 142 (tc = tuba_table[index]) != 0 && (delta == 1 || tc->tc_refcnt > 0)) 143 tc->tc_refcnt += delta; 144 if ((index = tuba_lookup(&isop->isop_sladdr.siso_addr, M_DONTWAIT)) != 0 && 145 (tc = tuba_table[index]) != 0 && (delta == 1 || tc->tc_refcnt > 0)) 146 tc->tc_refcnt += delta; 147 } 148 149 tuba_pcbdetach(isop) 150 struct isopcb *isop; 151 { 152 if (isop == 0) 153 return; 154 tuba_refcnt(isop, -1); 155 isop->isop_socket = 0; 156 iso_pcbdetach(isop); 157 } 158 159 /* 160 * Avoid in_pcbconnect in faked out tcp_input() 161 */ 162 tuba_pcbconnect(inp, nam) 163 register struct inpcb *inp; 164 struct mbuf *nam; 165 { 166 register struct sockaddr_iso *siso = mtod(nam, struct sockaddr_iso *); 167 struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 168 struct tcpcb *tp = intotcpcb(inp); 169 unsigned index = sin->sin_addr.s_addr; 170 struct tuba_cache *tc = tuba_table[index]; 171 struct isopcb *isop = (struct isopcb *)tp->t_tuba_pcb; 172 int error; 173 174 inp->inp_faddr.s_addr = index; 175 inp->inp_fport = sin->sin_port; 176 *siso = null_siso; 177 siso->siso_addr = tc->tc_addr; 178 siso->siso_tlen = sizeof(inp->inp_fport); 179 bcopy((caddr_t)&inp->inp_fport, TSEL(siso), sizeof(inp->inp_fport)); 180 nam->m_len = sizeof(*siso); 181 if ((error = iso_pcbconnect(isop, nam)) == 0) 182 tuba_refcnt(isop, 1); 183 return (error); 184 } 185 186 /* 187 * CALLED FROM: 188 * clnp's input routine, indirectly through the protosw. 189 * FUNCTION and ARGUMENTS: 190 * Take a packet (m) from clnp, strip off the clnp header 191 * and do tcp input processing. 192 * No return value. 193 */ 194 tuba_tcpinput(m, src, dst, clnp_len, ce_bit) 195 register struct mbuf *m; 196 struct sockaddr_iso *src, *dst; 197 int clnp_len, ce_bit; 198 { 199 int s = splnet(); 200 unsigned long sum, lindex, findex; 201 register struct tcpiphdr *ti; 202 register struct inpcb *inp; 203 struct mbuf *om; 204 int len, tlen, off; 205 register struct tcpcb *tp = 0; 206 int tiflags; 207 struct socket *so; 208 int todrop, acked, ourfinisacked, needoutput = 0; 209 short ostate; 210 struct in_addr laddr; 211 int dropsocket = 0, iss = 0; 212 213 if ((m->m_flags & M_PKTHDR) == 0) { 214 om = m_gethdr(M_DONTWAIT, MT_DATA); 215 if (om == 0) 216 goto drop; 217 om->m_next = m; 218 for (len = 0; m; m = m->m_next) 219 len += m->m_len; 220 m = om; 221 m->m_pkthdr.len = len; 222 } 223 om = 0; 224 /* 225 * Do some housekeeping looking up CLNP addresses. 226 * If we are out of space might as well drop the packet now. 227 */ 228 tcpstat.tcps_rcvtotal++; 229 lindex = tuba_lookup(&dst->siso_addr, M_DONTWAIT); 230 findex = tuba_lookup(&dst->siso_addr, M_DONTWAIT); 231 if (lindex == 0 || findex == 0) 232 goto drop; 233 /* 234 * Get CLNP and TCP header together in first mbuf. 235 * CLNP gave us an mbuf chain WITH the clnp header pulled up, 236 * and the length of the clnp header. 237 */ 238 len = clnp_len + sizeof(struct tcphdr); 239 if (m->m_len < len) { 240 if ((m = m_pullup(m, len)) == 0) { 241 tcpstat.tcps_rcvshort++; 242 return; 243 } 244 } 245 /* 246 * Calculate checksum of extended TCP header and data, 247 * by adjusting the checksum for missing parts of the header. 248 */ 249 m->m_data += clnp_len; 250 m->m_len -= clnp_len; 251 tlen = m->m_pkthdr.len -= clnp_len; 252 m->m_data -= sizeof(struct ip); 253 m->m_len += sizeof(struct ip); 254 m->m_pkthdr.len += sizeof(struct ip); 255 /* 256 * The reassembly code assumes it will be overwriting a useless 257 * part of the packet, which is why we need to have it point 258 * into the packet itself. 259 * 260 * Check to see if the data is properly alligned 261 * so that we can save copying the tcp header. 262 * This code knows way too much about the structure of mbufs! 263 */ 264 off = ((sizeof (long) - 1) & ((m->m_flags & M_EXT) ? 265 (m->m_data - m->m_ext.ext_buf) : (m->m_data - m->m_pktdat))); 266 if (off) { 267 struct mbuf *m0 = m_gethdr(M_DONTWAIT, MT_DATA); 268 if (m0 == 0) { 269 goto drop; 270 } 271 m0->m_data += max_linkhdr; 272 bcopy(mtod(m, caddr_t) + sizeof(struct ip), 273 mtod(m0, caddr_t) + sizeof(struct ip), 274 sizeof(struct tcphdr)); 275 m->m_data += sizeof(struct tcpiphdr); 276 m0->m_next = m; 277 m0->m_pkthdr = m->m_pkthdr; 278 m0->m_flags = m->m_flags & M_COPYFLAGS; 279 m0->m_len = sizeof(struct tcpiphdr); 280 m = m0; 281 } 282 ti = mtod(m, struct tcpiphdr *); 283 ti->ti_src.s_addr = tuba_table[findex]->tc_sum_in; 284 ti->ti_dst.s_addr = tuba_table[lindex]->tc_sum_in; 285 ti->ti_prev = ti->ti_next = 0; 286 ti->ti_x1 = 0; ti->ti_pr = ISOPROTO_TCP; 287 ti->ti_len = htons((u_short)tlen); 288 if (ti->ti_sum = in_cksum(m, m->m_pkthdr.len)) { 289 tcpstat.tcps_rcvbadsum++; 290 goto drop; 291 } 292 ti->ti_src.s_addr = findex; 293 ti->ti_dst.s_addr = lindex; 294 /* 295 * Now include the rest of TCP input 296 */ 297 #define TUBA_INCLUDE 298 #define in_pcbconnect tuba_pcbconnect 299 #define tcb tuba_inpcb 300 #define tcp_last_inpcb tuba_last_inpcb 301 302 #include <netinet/tcp_input.c> 303 } 304