1 /* 2 * Copyright (c) 2003, 2004 Jeffrey M. Hsu. All rights reserved. 3 * Copyright (c) 2003, 2004 The DragonFly Project. All rights reserved. 4 * 5 * This code is derived from software contributed to The DragonFly Project 6 * by Jeffrey M. Hsu. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of The DragonFly Project nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific, prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 30 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * $DragonFly: src/sys/netinet/ip_demux.c,v 1.45 2008/11/11 10:46:58 sephe Exp $ 34 */ 35 36 #include "opt_inet.h" 37 #include "opt_rss.h" 38 39 #include <sys/param.h> 40 #include <sys/systm.h> 41 #include <sys/kernel.h> 42 #include <sys/socket.h> 43 #include <sys/socketvar.h> 44 #include <sys/thread.h> 45 #include <sys/sysctl.h> 46 #include <sys/globaldata.h> 47 48 #include <net/if.h> 49 #include <net/netisr.h> 50 #include <net/toeplitz2.h> 51 52 #include <netinet/in_systm.h> 53 #include <netinet/in.h> 54 #include <netinet/in_var.h> 55 #include <netinet/in_pcb.h> 56 #include <netinet/ip.h> 57 #include <netinet/ip_var.h> 58 #include <netinet/tcp.h> 59 #include <netinet/tcpip.h> 60 #include <netinet/tcp_var.h> 61 #include <netinet/udp.h> 62 #include <netinet/udp_var.h> 63 64 extern int udp_mpsafe_thread; 65 66 /* 67 * Toeplitz hash functions - the idea is to match the hardware. 68 */ 69 static __inline int 70 INP_MPORT_HASH_UDP(in_addr_t faddr, in_addr_t laddr, 71 in_port_t fport, in_port_t lport) 72 { 73 return toeplitz_hash(toeplitz_rawhash_addr(faddr, laddr)); 74 } 75 76 static __inline int 77 INP_MPORT_HASH_TCP(in_addr_t faddr, in_addr_t laddr, 78 in_port_t fport, in_port_t lport) 79 { 80 return toeplitz_hash( 81 toeplitz_rawhash_addrport(faddr, laddr, fport, lport)); 82 } 83 84 /* 85 * Map a network address to a processor. 86 */ 87 int 88 tcp_addrcpu(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport) 89 { 90 return (INP_MPORT_HASH_TCP(faddr, laddr, fport, lport)); 91 } 92 93 /* 94 * Not implemented yet, use protocol thread 0 95 */ 96 int 97 udp_addrcpu(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport) 98 { 99 #ifdef notyet 100 return (INP_MPORT_HASH_UDP(faddr, laddr, fport, lport)); 101 #else 102 return 0; 103 #endif 104 } 105 106 /* 107 * If the packet is a valid IP datagram, upon returning of this function 108 * following things are promised: 109 * 110 * o IP header (including any possible IP options) and any data preceding 111 * IP header (usually linker layer header) are in one mbuf (m_len). 112 * o IP header length is not less than the minimum (sizeof(struct ip)). 113 * o IP total length is not less than IP header length. 114 * o IP datagram resides completely in the mbuf chain, 115 * i.e. pkthdr.len >= IP total length. 116 * 117 * If the packet is a UDP datagram, 118 * o IP header (including any possible IP options) and UDP header are in 119 * one mbuf (m_len). 120 * o IP total length is not less than (IP header length + UDP header length). 121 * 122 * If the packet is a TCP segment, 123 * o IP header (including any possible IP options) and TCP header (including 124 * any possible TCP options) are in one mbuf (m_len). 125 * o TCP header length is not less than the minimum (sizeof(struct tcphdr)). 126 * o IP total length is not less than (IP header length + TCP header length). 127 */ 128 boolean_t 129 ip_lengthcheck(struct mbuf **mp, int hoff) 130 { 131 struct mbuf *m = *mp; 132 struct ip *ip; 133 int len, iphlen, iplen; 134 struct tcphdr *th; 135 int thoff; /* TCP data offset */ 136 137 len = hoff + sizeof(struct ip); 138 139 /* The packet must be at least the size of an IP header. */ 140 if (m->m_pkthdr.len < len) { 141 ipstat.ips_tooshort++; 142 goto fail; 143 } 144 145 /* The fixed IP header must reside completely in the first mbuf. */ 146 if (m->m_len < len) { 147 m = m_pullup(m, len); 148 if (m == NULL) { 149 ipstat.ips_toosmall++; 150 goto fail; 151 } 152 } 153 154 ip = mtodoff(m, struct ip *, hoff); 155 156 /* Bound check the packet's stated IP header length. */ 157 iphlen = ip->ip_hl << 2; 158 if (iphlen < sizeof(struct ip)) { /* minimum header length */ 159 ipstat.ips_badhlen++; 160 goto fail; 161 } 162 163 /* The full IP header must reside completely in the one mbuf. */ 164 if (m->m_len < hoff + iphlen) { 165 m = m_pullup(m, hoff + iphlen); 166 if (m == NULL) { 167 ipstat.ips_badhlen++; 168 goto fail; 169 } 170 ip = mtodoff(m, struct ip *, hoff); 171 } 172 173 iplen = ntohs(ip->ip_len); 174 175 /* 176 * Check that the amount of data in the buffers is as 177 * at least much as the IP header would have us expect. 178 */ 179 if (m->m_pkthdr.len < hoff + iplen) { 180 ipstat.ips_tooshort++; 181 goto fail; 182 } 183 184 /* 185 * Fragments other than the first fragment don't have much 186 * length information. 187 */ 188 if (ntohs(ip->ip_off) & IP_OFFMASK) 189 goto ipcheckonly; 190 191 /* 192 * The TCP/IP or UDP/IP header must be entirely contained within 193 * the first fragment of a packet. Packet filters will break if they 194 * aren't. 195 * 196 * Since the packet will be trimmed to ip_len we must also make sure 197 * the potentially trimmed down length is still sufficient to hold 198 * the header(s). 199 */ 200 switch (ip->ip_p) { 201 case IPPROTO_TCP: 202 if (iplen < iphlen + sizeof(struct tcphdr)) { 203 ++tcpstat.tcps_rcvshort; 204 goto fail; 205 } 206 if (m->m_len < hoff + iphlen + sizeof(struct tcphdr)) { 207 m = m_pullup(m, hoff + iphlen + sizeof(struct tcphdr)); 208 if (m == NULL) { 209 tcpstat.tcps_rcvshort++; 210 goto fail; 211 } 212 ip = mtodoff(m, struct ip *, hoff); 213 } 214 th = (struct tcphdr *)((caddr_t)ip + iphlen); 215 thoff = th->th_off << 2; 216 if (thoff < sizeof(struct tcphdr) || 217 thoff + iphlen > ntohs(ip->ip_len)) { 218 tcpstat.tcps_rcvbadoff++; 219 goto fail; 220 } 221 if (m->m_len < hoff + iphlen + thoff) { 222 m = m_pullup(m, hoff + iphlen + thoff); 223 if (m == NULL) { 224 tcpstat.tcps_rcvshort++; 225 goto fail; 226 } 227 } 228 break; 229 case IPPROTO_UDP: 230 if (iplen < iphlen + sizeof(struct udphdr)) { 231 ++udpstat.udps_hdrops; 232 goto fail; 233 } 234 if (m->m_len < hoff + iphlen + sizeof(struct udphdr)) { 235 m = m_pullup(m, hoff + iphlen + sizeof(struct udphdr)); 236 if (m == NULL) { 237 udpstat.udps_hdrops++; 238 goto fail; 239 } 240 } 241 break; 242 default: 243 ipcheckonly: 244 if (iplen < iphlen) { 245 ++ipstat.ips_badlen; 246 goto fail; 247 } 248 break; 249 } 250 251 m->m_flags |= M_LENCHECKED; 252 *mp = m; 253 return TRUE; 254 255 fail: 256 if (m != NULL) 257 m_freem(m); 258 *mp = NULL; 259 return FALSE; 260 } 261 262 /* 263 * Assign a protocol processing thread to a packet. The IP header is at 264 * offset (hoff) in the packet (i.e. the mac header might still be intact). 265 * 266 * This function can blow away the mbuf if the packet is malformed. 267 */ 268 void 269 ip_cpufn(struct mbuf **mptr, int hoff, int dir) 270 { 271 struct ip *ip; 272 int iphlen; 273 struct tcphdr *th; 274 struct udphdr *uh; 275 struct mbuf *m; 276 int thoff; /* TCP data offset */ 277 int cpu; 278 279 if (!ip_lengthcheck(mptr, hoff)) 280 return; 281 282 m = *mptr; 283 ip = mtodoff(m, struct ip *, hoff); 284 iphlen = ip->ip_hl << 2; 285 286 /* 287 * XXX generic packet handling defrag on CPU 0 for now. 288 */ 289 if (ntohs(ip->ip_off) & (IP_MF | IP_OFFMASK)) { 290 cpu = 0; 291 goto back; 292 } 293 294 switch (ip->ip_p) { 295 case IPPROTO_TCP: 296 th = (struct tcphdr *)((caddr_t)ip + iphlen); 297 thoff = th->th_off << 2; 298 cpu = INP_MPORT_HASH_TCP(ip->ip_src.s_addr, 299 ip->ip_dst.s_addr, 300 th->th_sport, 301 th->th_dport); 302 break; 303 304 case IPPROTO_UDP: 305 uh = (struct udphdr *)((caddr_t)ip + iphlen); 306 307 cpu = INP_MPORT_HASH_UDP(ip->ip_src.s_addr, 308 ip->ip_dst.s_addr, 309 uh->uh_sport, 310 uh->uh_dport); 311 break; 312 313 default: 314 cpu = 0; 315 break; 316 } 317 back: 318 m->m_flags |= M_HASH; 319 m->m_pkthdr.hash = cpu; 320 } 321 322 void 323 ip_cpufn_in(struct mbuf **mptr, int hoff) 324 { 325 ip_cpufn(mptr, hoff, IP_MPORT_IN); 326 } 327 328 /* 329 * Verify and adjust the hash value of the packet. 330 * 331 * Unlike ip_cpufn(), the packet content is not accessed. The packet info 332 * (pi) and the hash of the packet (m_pkthdr.hash) is used instead. 333 * 334 * Caller has already made sure that m_pkthdr.hash is valid, i.e. m_flags 335 * has M_HASH set. 336 */ 337 void 338 ip_hashcheck(struct mbuf *m, const struct pktinfo *pi) 339 { 340 KASSERT((m->m_flags & M_HASH), ("no valid packet hash\n")); 341 KASSERT(m->m_pkthdr.hash < ncpus2, 342 ("invalid packet hash %#x\n", m->m_pkthdr.hash)); 343 344 /* 345 * XXX generic packet handling defrag on CPU 0 for now. 346 */ 347 if (pi->pi_flags & PKTINFO_FLAG_FRAG) { 348 m->m_pkthdr.hash = 0; 349 return; 350 } 351 352 switch (pi->pi_l3proto) { 353 case IPPROTO_TCP: 354 case IPPROTO_UDP: 355 break; 356 357 default: 358 /* Let software calculate the hash */ 359 m->m_flags &= ~M_HASH; 360 break; 361 } 362 } 363 364 /* 365 * This is used to map a socket to a message port for sendmsg() and friends. 366 * It is not called for any other purpose. In the case of TCP we just return 367 * the port already installed in the socket. 368 */ 369 lwkt_port_t 370 tcp_soport(struct socket *so, struct sockaddr *nam, 371 struct mbuf **dummy __unused) 372 { 373 return(so->so_port); 374 } 375 376 /* 377 * Used to route icmp messages to the proper protocol thread for ctlinput 378 * operation. 379 */ 380 lwkt_port_t 381 tcp_ctlport(int cmd, struct sockaddr *sa, void *vip) 382 { 383 struct ip *ip = vip; 384 struct tcphdr *th; 385 struct in_addr faddr; 386 int cpu; 387 388 faddr = ((struct sockaddr_in *)sa)->sin_addr; 389 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 390 return(NULL); 391 if (ip == NULL || PRC_IS_REDIRECT(cmd) || cmd == PRC_HOSTDEAD) { 392 /* 393 * A new message will be allocated later to save necessary 394 * information and will be forwarded to all network protocol 395 * threads in the following way: 396 * 397 * (the the thread owns the msgport that we return here) 398 * netisr0 <--+ 399 * | | 400 * | | 401 * | | 402 * +-------+ 403 * sendmsg 404 * [msg is kmalloc()ed] 405 * 406 * 407 * Later on, when the msg is received by netisr0: 408 * 409 * forwardmsg forwardmsg 410 * netisr0 ---------> netisr1 ---------> netisrN 411 * [msg is kfree()ed] 412 */ 413 return cpu0_ctlport(cmd, sa, vip); 414 } else { 415 th = (struct tcphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 416 cpu = tcp_addrcpu(faddr.s_addr, th->th_dport, 417 ip->ip_src.s_addr, th->th_sport); 418 } 419 return(cpu_portfn(cpu)); 420 } 421 422 lwkt_port_t 423 tcp_addrport(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport) 424 { 425 return(cpu_portfn(tcp_addrcpu(faddr, fport, laddr, lport))); 426 } 427 428 lwkt_port_t 429 tcp_addrport0(void) 430 { 431 return(cpu_portfn(0)); 432 } 433 434 lwkt_port_t 435 udp_addrport(in_addr_t faddr, in_port_t fport, in_addr_t laddr, in_port_t lport) 436 { 437 return(cpu_portfn(udp_addrcpu(faddr, fport, laddr, lport))); 438 } 439 440 /* 441 * Used to route icmp messages to the proper protocol thread for ctlinput 442 * operation. 443 */ 444 lwkt_port_t 445 udp_ctlport(int cmd, struct sockaddr *sa, void *vip) 446 { 447 struct ip *ip = vip; 448 struct udphdr *uh; 449 struct in_addr faddr; 450 int cpu; 451 452 faddr = ((struct sockaddr_in *)sa)->sin_addr; 453 if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY) 454 return(NULL); 455 if (PRC_IS_REDIRECT(cmd)) { 456 /* 457 * See the comment in tcp_ctlport; the only difference 458 * is that message is forwarded to UDP protocol theads. 459 */ 460 return cpu0_ctlport(cmd, sa, vip); 461 } else if (ip == NULL || cmd == PRC_HOSTDEAD) { 462 /* 463 * XXX 464 * Once UDP inpcbs are CPU localized, we should do 465 * the same forwarding as PRC_IS_REDIRECT(cmd) 466 */ 467 cpu = 0; 468 } else { 469 uh = (struct udphdr *)((caddr_t)ip + (ip->ip_hl << 2)); 470 471 cpu = udp_addrcpu(faddr.s_addr, ip->ip_src.s_addr, 472 uh->uh_dport, uh->uh_sport); 473 } 474 return (cpu_portfn(cpu)); 475 } 476