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 7.8 (Berkeley) 11/08/92 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, tcp_keepidle, tcp_keepintvl, tcp_maxidle; 46 extern int tcppcbcachemiss, tcppredack, tcppreddat, tcprexmtthresh; 47 extern struct tcpiphdr tcp_saveti; 48 struct inpcb tuba_inpcb; 49 struct inpcb *tuba_last_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 = &tc->tc_siso; 80 REDUCE(*sum, *sum + tc->tc_sum_out); 81 } else 82 *error = 1; 83 } 84 85 tuba_output(m, tp) 86 register struct mbuf *m; 87 struct tcpcb *tp; 88 { 89 struct isopcb *isop; 90 register struct tcpiphdr *n; 91 u_long sum, i; 92 93 if (tp == 0 || (n = tp->t_template) == 0 || 94 (isop = (struct isopcb *)tp->t_tuba_pcb) == 0) { 95 isop = &tuba_isopcb; 96 n = mtod(m, struct tcpiphdr *); 97 i = sum = 0; 98 tuba_getaddr(&i, &sum, &tuba_isopcb.isop_faddr, 99 n->ti_dst.s_addr); 100 tuba_getaddr(&i, &sum, &tuba_isopcb.isop_laddr, 101 n->ti_src.s_addr); 102 goto adjust; 103 } 104 if (n->ti_sum == 0) { 105 i = sum = 0; 106 tuba_getaddr(&i, &sum, (struct sockaddr_iso **)0, 107 n->ti_dst.s_addr); 108 tuba_getaddr(&i, &sum, (struct sockaddr_iso **)0, 109 n->ti_src.s_addr); 110 n->ti_sum = sum; 111 n = mtod(m, struct tcpiphdr *); 112 adjust: 113 if (i) { 114 m_freem(m); 115 return (EADDRNOTAVAIL); 116 } 117 REDUCE(n->ti_sum, n->ti_sum + (0xffff ^ sum)); 118 } 119 m->m_len -= sizeof (struct ip); 120 m->m_pkthdr.len -= sizeof (struct ip); 121 m->m_data += sizeof (struct ip); 122 i = clnp_output(m, isop, m->m_pkthdr.len, 0); 123 return (i); 124 } 125 126 tuba_refcnt(isop, delta) 127 struct isopcb *isop; 128 { 129 register struct tuba_cache *tc; 130 unsigned index, sum; 131 132 if (delta != 1) 133 delta = -1; 134 if (isop == 0 || isop->isop_faddr == 0 || isop->isop_laddr == 0 || 135 (delta == -1 && isop->isop_tuba_cached == 0) || 136 (delta == 1 && isop->isop_tuba_cached != 0)) 137 return; 138 isop->isop_tuba_cached = (delta == 1); 139 if ((index = tuba_lookup(&isop->isop_sfaddr.siso_addr, M_DONTWAIT)) != 0 && 140 (tc = tuba_table[index]) != 0 && (delta == 1 || tc->tc_refcnt > 0)) 141 tc->tc_refcnt += delta; 142 if ((index = tuba_lookup(&isop->isop_sladdr.siso_addr, M_DONTWAIT)) != 0 && 143 (tc = tuba_table[index]) != 0 && (delta == 1 || tc->tc_refcnt > 0)) 144 tc->tc_refcnt += delta; 145 } 146 147 tuba_pcbdetach(isop) 148 struct isopcb *isop; 149 { 150 if (isop == 0) 151 return; 152 tuba_refcnt(isop, -1); 153 isop->isop_socket = 0; 154 iso_pcbdetach(isop); 155 } 156 157 /* 158 * Avoid in_pcbconnect in faked out tcp_input() 159 */ 160 tuba_pcbconnect(inp, nam) 161 register struct inpcb *inp; 162 struct mbuf *nam; 163 { 164 register struct sockaddr_iso *siso = mtod(nam, struct sockaddr_iso *); 165 struct sockaddr_in *sin = mtod(nam, struct sockaddr_in *); 166 struct tcpcb *tp = intotcpcb(inp); 167 unsigned index = sin->sin_addr.s_addr; 168 struct tuba_cache *tc = tuba_table[index]; 169 struct isopcb *isop = (struct isopcb *)tp->t_tuba_pcb; 170 int error; 171 172 inp->inp_faddr.s_addr = index; 173 inp->inp_fport = sin->sin_port; 174 *siso = tc->tc_siso; 175 siso->siso_tlen = sizeof(inp->inp_fport); 176 bcopy((caddr_t)&inp->inp_fport, TSEL(siso), sizeof(inp->inp_fport)); 177 nam->m_len = sizeof(*siso); 178 if ((error = iso_pcbconnect(isop, nam)) == 0) 179 tuba_refcnt(isop, 1); 180 return (error); 181 } 182 183 /* 184 * CALLED FROM: 185 * clnp's input routine, indirectly through the protosw. 186 * FUNCTION and ARGUMENTS: 187 * Take a packet (m) from clnp, strip off the clnp header 188 * and do tcp input processing. 189 * No return value. 190 */ 191 tuba_tcpinput(m, src, dst, clnp_len, ce_bit) 192 register struct mbuf *m; 193 struct sockaddr_iso *src, *dst; 194 int clnp_len, ce_bit; 195 { 196 unsigned long sum, lindex, findex; 197 register struct tcpiphdr *ti; 198 register struct inpcb *inp; 199 struct mbuf *om; 200 int len, tlen, off; 201 register struct tcpcb *tp = 0; 202 int tiflags; 203 struct socket *so; 204 int todrop, acked, ourfinisacked, needoutput = 0; 205 short ostate; 206 struct in_addr laddr; 207 int dropsocket = 0, iss = 0; 208 209 if ((m->m_flags & M_PKTHDR) == 0) { 210 om = m_gethdr(M_DONTWAIT, MT_DATA); 211 if (om == 0) 212 goto drop; 213 om->m_next = m; 214 for (len = 0; m; m = m->m_next) 215 len += m->m_len; 216 m = om; 217 m->m_pkthdr.len = len; 218 } 219 om = 0; 220 /* 221 * Do some housekeeping looking up CLNP addresses. 222 * If we are out of space might as well drop the packet now. 223 */ 224 tcpstat.tcps_rcvtotal++; 225 lindex = tuba_lookup(&dst->siso_addr, M_DONTWAIT); 226 findex = tuba_lookup(&dst->siso_addr, M_DONTWAIT); 227 if (lindex == 0 || findex == 0) 228 goto drop; 229 /* 230 * Get CLNP and TCP header together in first mbuf. 231 * CLNP gave us an mbuf chain WITH the clnp header pulled up, 232 * and the length of the clnp header. 233 */ 234 len = clnp_len + sizeof(struct tcphdr); 235 if (m->m_len < len) { 236 if ((m = m_pullup(m, len)) == 0) { 237 tcpstat.tcps_rcvshort++; 238 return; 239 } 240 } 241 /* 242 * Calculate checksum of extended TCP header and data, 243 * by adjusting the checksum for missing parts of the header. 244 */ 245 m->m_data += clnp_len; 246 m->m_len -= clnp_len; 247 tlen = m->m_pkthdr.len -= clnp_len; 248 m->m_data -= sizeof(struct ip); 249 m->m_len += sizeof(struct ip); 250 m->m_pkthdr.len += sizeof(struct ip); 251 /* 252 * The reassembly code assumes it will be overwriting a useless 253 * part of the packet, which is why we need to have it point 254 * into the packet itself. 255 * 256 * Check to see if the data is properly alligned 257 * so that we can save copying the tcp header. 258 * This code knows way too much about the structure of mbufs! 259 */ 260 off = ((sizeof (long) - 1) & ((m->m_flags & M_EXT) ? 261 (m->m_data - m->m_ext.ext_buf) : (m->m_data - m->m_pktdat))); 262 if (off) { 263 struct mbuf *m0 = m_gethdr(M_DONTWAIT, MT_DATA); 264 if (m0 == 0) { 265 goto drop; 266 } 267 m0->m_data += max_linkhdr; 268 bcopy(mtod(m, caddr_t) + sizeof(struct ip), 269 mtod(m0, caddr_t) + sizeof(struct ip), 270 sizeof(struct tcphdr)); 271 m->m_data += sizeof(struct tcpiphdr); 272 m->m_len -= sizeof(struct tcpiphdr); 273 m0->m_next = m; 274 m0->m_pkthdr = m->m_pkthdr; 275 m0->m_flags = m->m_flags & M_COPYFLAGS; 276 m0->m_len = sizeof(struct tcpiphdr); 277 m = m0; 278 } 279 ti = mtod(m, struct tcpiphdr *); 280 ti->ti_src.s_addr = tuba_table[findex]->tc_sum_in; 281 ti->ti_dst.s_addr = tuba_table[lindex]->tc_sum_in; 282 ti->ti_prev = ti->ti_next = 0; 283 ti->ti_x1 = 0; ti->ti_pr = ISOPROTO_TCP; 284 ti->ti_len = htons((u_short)tlen); 285 if (ti->ti_sum = in_cksum(m, m->m_pkthdr.len)) { 286 tcpstat.tcps_rcvbadsum++; 287 goto drop; 288 } 289 ti->ti_src.s_addr = findex; 290 ti->ti_dst.s_addr = lindex; 291 /* 292 * Now include the rest of TCP input 293 */ 294 #define TUBA_INCLUDE 295 #define in_pcbconnect tuba_pcbconnect 296 #define tcb tuba_inpcb 297 #define tcp_last_inpcb tuba_last_inpcb 298 299 #include <netinet/tcp_input.c> 300 } 301 302 #define tcp_slowtimo tuba_slowtimo 303 #define tcp_fasttimo tuba_fasttimo 304 #include <netinet/tcp_timer.c> 305