1 /*- 2 * Copyright (c) 2010-2011 Juniper Networks, Inc. 3 * All rights reserved. 4 * 5 * This software was developed by Robert N. M. Watson under contract 6 * to Juniper Networks, Inc. 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 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 31 #include "opt_inet6.h" 32 33 #include <sys/param.h> 34 #include <sys/mbuf.h> 35 #include <sys/socket.h> 36 #include <sys/priv.h> 37 #include <sys/kernel.h> 38 #include <sys/smp.h> 39 #include <sys/sysctl.h> 40 #include <sys/sbuf.h> 41 42 #include <net/if.h> 43 #include <net/if_var.h> 44 #include <net/netisr.h> 45 #include <net/rss_config.h> 46 47 #include <netinet/in.h> 48 #include <netinet/in_pcb.h> 49 #include <netinet6/in6_rss.h> 50 #include <netinet/in_var.h> 51 52 /* for software rss hash support */ 53 #include <netinet/ip6.h> 54 #include <netinet6/ip6_var.h> 55 #include <netinet/tcp.h> 56 #include <netinet/udp.h> 57 58 /* 59 * Hash an IPv6 2-tuple. 60 */ 61 uint32_t 62 rss_hash_ip6_2tuple(const struct in6_addr *src, const struct in6_addr *dst) 63 { 64 uint8_t data[sizeof(*src) + sizeof(*dst)]; 65 u_int datalen; 66 67 datalen = 0; 68 bcopy(src, &data[datalen], sizeof(*src)); 69 datalen += sizeof(*src); 70 bcopy(dst, &data[datalen], sizeof(*dst)); 71 datalen += sizeof(*dst); 72 return (rss_hash(datalen, data)); 73 } 74 75 /* 76 * Hash an IPv6 4-tuple. 77 */ 78 uint32_t 79 rss_hash_ip6_4tuple(const struct in6_addr *src, u_short srcport, 80 const struct in6_addr *dst, u_short dstport) 81 { 82 uint8_t data[sizeof(*src) + sizeof(*dst) + sizeof(srcport) + 83 sizeof(dstport)]; 84 u_int datalen; 85 86 datalen = 0; 87 bcopy(src, &data[datalen], sizeof(*src)); 88 datalen += sizeof(*src); 89 bcopy(dst, &data[datalen], sizeof(*dst)); 90 datalen += sizeof(*dst); 91 bcopy(&srcport, &data[datalen], sizeof(srcport)); 92 datalen += sizeof(srcport); 93 bcopy(&dstport, &data[datalen], sizeof(dstport)); 94 datalen += sizeof(dstport); 95 return (rss_hash(datalen, data)); 96 } 97 98 /* 99 * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given 100 * IPv6 source/destination address, UDP or TCP source/destination ports 101 * and the protocol type. 102 * 103 * The protocol code may wish to do a software hash of the given 104 * tuple. This depends upon the currently configured RSS hash types. 105 * 106 * This assumes that the packet in question isn't a fragment. 107 * 108 * It also assumes the packet source/destination address 109 * are in "incoming" packet order (ie, source is "far" address.) 110 */ 111 int 112 rss_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d, 113 u_short sp, u_short dp, int proto, 114 uint32_t *hashval, uint32_t *hashtype) 115 { 116 uint32_t hash; 117 118 /* 119 * Next, choose the hash type depending upon the protocol 120 * identifier. 121 */ 122 if ((proto == IPPROTO_TCP) && 123 (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) { 124 hash = rss_hash_ip6_4tuple(s, sp, d, dp); 125 *hashval = hash; 126 *hashtype = M_HASHTYPE_RSS_TCP_IPV6; 127 return (0); 128 } else if ((proto == IPPROTO_UDP) && 129 (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) { 130 hash = rss_hash_ip6_4tuple(s, sp, d, dp); 131 *hashval = hash; 132 *hashtype = M_HASHTYPE_RSS_UDP_IPV6; 133 return (0); 134 } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) { 135 /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */ 136 hash = rss_hash_ip6_2tuple(s, d); 137 *hashval = hash; 138 *hashtype = M_HASHTYPE_RSS_IPV6; 139 return (0); 140 } 141 142 /* No configured available hashtypes! */ 143 RSS_DEBUG("no available hashtypes!\n"); 144 return (-1); 145 } 146 147 /* 148 * Calculate an appropriate ipv6 2-tuple or 4-tuple given the given 149 * IPv6 source/destination address, UDP or TCP source/destination ports 150 * and the protocol type. 151 * 152 * The protocol code may wish to do a software hash of the given 153 * tuple. This depends upon the currently configured RSS hash types. 154 * 155 * It assumes the packet source/destination address 156 * are in "outgoin" packet order (ie, destination is "far" address.) 157 */ 158 uint32_t 159 xps_proto_software_hash_v6(const struct in6_addr *s, const struct in6_addr *d, 160 u_short sp, u_short dp, int proto, uint32_t *hashtype) 161 { 162 163 uint32_t hash; 164 165 /* 166 * Next, choose the hash type depending upon the protocol 167 * identifier. 168 */ 169 if ((proto == IPPROTO_TCP) && 170 (rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6)) { 171 hash = rss_hash_ip6_4tuple(d, dp, s, sp); 172 *hashtype = M_HASHTYPE_RSS_TCP_IPV6; 173 return (hash); 174 } else if ((proto == IPPROTO_UDP) && 175 (rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6)) { 176 hash = rss_hash_ip6_4tuple(d, dp, s, sp); 177 *hashtype = M_HASHTYPE_RSS_UDP_IPV6; 178 return (hash); 179 } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) { 180 /* RSS doesn't hash on other protocols like SCTP; so 2-tuple */ 181 hash = rss_hash_ip6_2tuple(d, s); 182 *hashtype = M_HASHTYPE_RSS_IPV6; 183 return (hash); 184 } 185 186 *hashtype = M_HASHTYPE_NONE; 187 return (0); 188 } 189 190 191 /* 192 * Do a software calculation of the RSS for the given mbuf. 193 * 194 * This is typically used by the input path to recalculate the RSS after 195 * some form of packet processing (eg de-capsulation, IP fragment reassembly.) 196 * 197 * dir is the packet direction - RSS_HASH_PKT_INGRESS for incoming and 198 * RSS_HASH_PKT_EGRESS for outgoing. 199 * 200 * Returns 0 if a hash was done, -1 if no hash was done, +1 if 201 * the mbuf already had a valid RSS flowid. 202 * 203 * This function doesn't modify the mbuf. It's up to the caller to 204 * assign flowid/flowtype as appropriate. 205 */ 206 int 207 rss_mbuf_software_hash_v6(const struct mbuf *m, int dir, uint32_t *hashval, 208 uint32_t *hashtype) 209 { 210 const struct ip6_hdr *ip6; 211 const struct ip6_frag *ip6f; 212 const struct tcphdr *th; 213 const struct udphdr *uh; 214 uint32_t flowtype; 215 uint8_t proto; 216 int off, newoff; 217 int nxt; 218 219 /* 220 * XXX For now this only handles hashing on incoming mbufs. 221 */ 222 if (dir != RSS_HASH_PKT_INGRESS) { 223 RSS_DEBUG("called on EGRESS packet!\n"); 224 return (-1); 225 } 226 227 off = sizeof(struct ip6_hdr); 228 229 /* 230 * First, validate that the mbuf we have is long enough 231 * to have an IPv6 header in it. 232 */ 233 if (m->m_pkthdr.len < off) { 234 RSS_DEBUG("short mbuf pkthdr\n"); 235 return (-1); 236 } 237 if (m->m_len < off) { 238 RSS_DEBUG("short mbuf len\n"); 239 return (-1); 240 } 241 242 /* Ok, let's dereference that */ 243 ip6 = mtod(m, struct ip6_hdr *); 244 proto = ip6->ip6_nxt; 245 246 /* 247 * Find the beginning of the TCP/UDP header. 248 * 249 * If this is a fragment then it shouldn't be four-tuple 250 * hashed just yet. Once it's reassembled into a full 251 * frame it should be re-hashed. 252 */ 253 while (proto != IPPROTO_FRAGMENT) { 254 newoff = ip6_nexthdr(m, off, proto, &nxt); 255 if (newoff < 0) 256 break; 257 off = newoff; 258 proto = nxt; 259 } 260 261 /* 262 * Ignore the fragment header if this is an "atomic" fragment 263 * (offset and m bit set to 0) 264 */ 265 if (proto == IPPROTO_FRAGMENT) { 266 if (m->m_len < off + sizeof(struct ip6_frag)) { 267 RSS_DEBUG("short fragment frame?\n"); 268 return (-1); 269 } 270 ip6f = (const struct ip6_frag *)((c_caddr_t)ip6 + off); 271 if ((ip6f->ip6f_offlg & ~IP6F_RESERVED_MASK) == 0) { 272 off = ip6_lasthdr(m, off, proto, &nxt); 273 if (off < 0) { 274 RSS_DEBUG("invalid extension header\n"); 275 return (-1); 276 } 277 proto = nxt; 278 } 279 } 280 281 /* 282 * If the mbuf flowid/flowtype matches the packet type, 283 * and we don't support the 4-tuple version of the given protocol, 284 * then signal to the owner that it can trust the flowid/flowtype 285 * details. 286 * 287 * This is a little picky - eg, if TCPv6 / UDPv6 hashing 288 * is supported but we got a TCP/UDP frame only 2-tuple hashed, 289 * then we shouldn't just "trust" the 2-tuple hash. We need 290 * a 4-tuple hash. 291 */ 292 flowtype = M_HASHTYPE_GET(m); 293 294 if (flowtype != M_HASHTYPE_NONE) { 295 switch (proto) { 296 case IPPROTO_UDP: 297 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) && 298 (flowtype == M_HASHTYPE_RSS_UDP_IPV6)) { 299 return (1); 300 } 301 /* 302 * Only allow 2-tuple for UDP frames if we don't also 303 * support 4-tuple for UDP. 304 */ 305 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) && 306 ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) == 0) && 307 flowtype == M_HASHTYPE_RSS_IPV6) { 308 return (1); 309 } 310 break; 311 case IPPROTO_TCP: 312 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) && 313 (flowtype == M_HASHTYPE_RSS_TCP_IPV6)) { 314 return (1); 315 } 316 /* 317 * Only allow 2-tuple for TCP frames if we don't also 318 * support 4-tuple for TCP. 319 */ 320 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) && 321 ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) == 0) && 322 flowtype == M_HASHTYPE_RSS_IPV6) { 323 return (1); 324 } 325 break; 326 default: 327 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) && 328 flowtype == M_HASHTYPE_RSS_IPV6) { 329 return (1); 330 } 331 break; 332 } 333 } 334 335 /* 336 * Decode enough information to make a hash decision. 337 */ 338 if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_TCP_IPV6) && 339 (proto == IPPROTO_TCP)) { 340 if (m->m_len < off + sizeof(struct tcphdr)) { 341 RSS_DEBUG("short TCP frame?\n"); 342 return (-1); 343 } 344 th = (const struct tcphdr *)((c_caddr_t)ip6 + off); 345 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst, 346 th->th_sport, 347 th->th_dport, 348 proto, 349 hashval, 350 hashtype); 351 } else if ((rss_gethashconfig() & RSS_HASHTYPE_RSS_UDP_IPV6) && 352 (proto == IPPROTO_UDP)) { 353 if (m->m_len < off + sizeof(struct udphdr)) { 354 RSS_DEBUG("short UDP frame?\n"); 355 return (-1); 356 } 357 uh = (const struct udphdr *)((c_caddr_t)ip6 + off); 358 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst, 359 uh->uh_sport, 360 uh->uh_dport, 361 proto, 362 hashval, 363 hashtype); 364 } else if (rss_gethashconfig() & RSS_HASHTYPE_RSS_IPV6) { 365 /* Default to 2-tuple hash */ 366 return rss_proto_software_hash_v6(&ip6->ip6_src, &ip6->ip6_dst, 367 0, /* source port */ 368 0, /* destination port */ 369 0, /* IPPROTO_IP */ 370 hashval, 371 hashtype); 372 } else { 373 RSS_DEBUG("no available hashtypes!\n"); 374 return (-1); 375 } 376 } 377 378 /* 379 * Similar to rss_m2cpuid, but designed to be used by the IPv6 NETISR 380 * on incoming frames. 381 * 382 * If an existing RSS hash exists and it matches what the configured 383 * hashing is, then use it. 384 * 385 * If there's an existing RSS hash but the desired hash is different, 386 * or if there's no useful RSS hash, then calculate it via 387 * the software path. 388 * 389 * XXX TODO: definitely want statistics here! 390 */ 391 struct mbuf * 392 rss_soft_m2cpuid_v6(struct mbuf *m, uintptr_t source, u_int *cpuid) 393 { 394 uint32_t hash_val, hash_type; 395 int ret; 396 397 M_ASSERTPKTHDR(m); 398 399 ret = rss_mbuf_software_hash_v6(m, RSS_HASH_PKT_INGRESS, 400 &hash_val, &hash_type); 401 if (ret > 0) { 402 /* mbuf has a valid hash already; don't need to modify it */ 403 *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m)); 404 } else if (ret == 0) { 405 /* hash was done; update */ 406 m->m_pkthdr.flowid = hash_val; 407 M_HASHTYPE_SET(m, hash_type); 408 *cpuid = rss_hash2cpuid(m->m_pkthdr.flowid, M_HASHTYPE_GET(m)); 409 } else { /* ret < 0 */ 410 /* no hash was done */ 411 *cpuid = NETISR_CPUID_NONE; 412 } 413 return (m); 414 } 415