1 /*- 2 * Copyright (c) 2015 3 * Alexander V. Chernikov <melifaro@FreeBSD.org> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 #include "opt_inet.h" 34 #include "opt_inet6.h" 35 #include "opt_route.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/lock.h> 40 #include <sys/rmlock.h> 41 #include <sys/malloc.h> 42 #include <sys/mbuf.h> 43 #include <sys/socket.h> 44 #include <sys/sysctl.h> 45 #include <sys/kernel.h> 46 47 #include <net/if.h> 48 #include <net/if_var.h> 49 #include <net/if_dl.h> 50 #include <net/route.h> 51 #include <net/route/route_ctl.h> 52 #include <net/route/route_var.h> 53 #include <net/route/nhop.h> 54 #include <net/toeplitz.h> 55 #include <net/vnet.h> 56 57 #include <netinet/in.h> 58 #include <netinet/in_var.h> 59 #include <netinet/ip_mroute.h> 60 #include <netinet/ip6.h> 61 #include <netinet6/in6_fib.h> 62 #include <netinet6/in6_var.h> 63 #include <netinet6/nd6.h> 64 #include <netinet6/scope6_var.h> 65 66 #include <net/if_types.h> 67 68 #ifdef INET6 69 70 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst); 71 72 #ifdef ROUTE_MPATH 73 struct _hash_5tuple_ipv6 { 74 struct in6_addr src; 75 struct in6_addr dst; 76 unsigned short src_port; 77 unsigned short dst_port; 78 char proto; 79 char spare[3]; 80 }; 81 _Static_assert(sizeof(struct _hash_5tuple_ipv6) == 40, 82 "_hash_5tuple_ipv6 size is wrong"); 83 84 uint32_t 85 fib6_calc_software_hash(const struct in6_addr *src, const struct in6_addr *dst, 86 unsigned short src_port, unsigned short dst_port, char proto, 87 uint32_t *phashtype) 88 { 89 struct _hash_5tuple_ipv6 data; 90 91 data.src = *src; 92 data.dst = *dst; 93 data.src_port = src_port; 94 data.dst_port = dst_port; 95 data.proto = proto; 96 data.spare[0] = data.spare[1] = data.spare[2] = 0; 97 98 *phashtype = M_HASHTYPE_OPAQUE_HASH; 99 100 return (toeplitz_hash(MPATH_ENTROPY_KEY_LEN, mpath_entropy_key, 101 sizeof(data), (uint8_t *)&data)); 102 } 103 #endif 104 105 /* 106 * Looks up path in fib @fibnum specified by @dst. 107 * Assumes scope is deembedded and provided in @scopeid. 108 * 109 * Returns path nexthop on success. Nexthop is safe to use 110 * within the current network epoch. If longer lifetime is required, 111 * one needs to pass NHR_REF as a flag. This will return referenced 112 * nexthop. 113 */ 114 struct nhop_object * 115 fib6_lookup(uint32_t fibnum, const struct in6_addr *dst6, 116 uint32_t scopeid, uint32_t flags, uint32_t flowid) 117 { 118 RIB_RLOCK_TRACKER; 119 struct rib_head *rh; 120 struct radix_node *rn; 121 struct nhop_object *nh; 122 struct sockaddr_in6 sin6; 123 124 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum")); 125 rh = rt_tables_get_rnh(fibnum, AF_INET6); 126 if (rh == NULL) 127 return (NULL); 128 129 /* TODO: radix changes */ 130 //addr = *dst6; 131 /* Prepare lookup key */ 132 memset(&sin6, 0, sizeof(sin6)); 133 sin6.sin6_len = sizeof(struct sockaddr_in6); 134 sin6.sin6_addr = *dst6; 135 136 /* Assume scopeid is valid and embed it directly */ 137 if (IN6_IS_SCOPE_LINKLOCAL(dst6)) 138 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 139 140 RIB_RLOCK(rh); 141 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 142 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 143 nh = nhop_select((RNTORT(rn))->rt_nhop, flowid); 144 /* Ensure route & ifp is UP */ 145 if (RT_LINK_IS_UP(nh->nh_ifp)) { 146 if (flags & NHR_REF) 147 nhop_ref_object(nh); 148 RIB_RUNLOCK(rh); 149 return (nh); 150 } 151 } 152 RIB_RUNLOCK(rh); 153 154 RTSTAT_INC(rts_unreach); 155 return (NULL); 156 } 157 158 inline static int 159 check_urpf_nhop(const struct nhop_object *nh, uint32_t flags, 160 const struct ifnet *src_if) 161 { 162 163 if (src_if != NULL && nh->nh_aifp == src_if) { 164 return (1); 165 } 166 if (src_if == NULL) { 167 if ((flags & NHR_NODEFAULT) == 0) 168 return (1); 169 else if ((nh->nh_flags & NHF_DEFAULT) == 0) 170 return (1); 171 } 172 173 return (0); 174 } 175 176 static int 177 check_urpf(struct nhop_object *nh, uint32_t flags, 178 const struct ifnet *src_if) 179 { 180 #ifdef ROUTE_MPATH 181 if (NH_IS_NHGRP(nh)) { 182 struct weightened_nhop *wn; 183 uint32_t num_nhops; 184 wn = nhgrp_get_nhops((struct nhgrp_object *)nh, &num_nhops); 185 for (int i = 0; i < num_nhops; i++) { 186 if (check_urpf_nhop(wn[i].nh, flags, src_if) != 0) 187 return (1); 188 } 189 return (0); 190 } else 191 #endif 192 return (check_urpf_nhop(nh, flags, src_if)); 193 } 194 195 /* 196 * Performs reverse path forwarding lookup. 197 * If @src_if is non-zero, verifies that at least 1 path goes via 198 * this interface. 199 * If @src_if is zero, verifies that route exist. 200 * if @flags contains NHR_NOTDEFAULT, do not consider default route. 201 * 202 * Returns 1 if route matching conditions is found, 0 otherwise. 203 */ 204 int 205 fib6_check_urpf(uint32_t fibnum, const struct in6_addr *dst6, 206 uint32_t scopeid, uint32_t flags, const struct ifnet *src_if) 207 { 208 RIB_RLOCK_TRACKER; 209 struct rib_head *rh; 210 struct radix_node *rn; 211 struct sockaddr_in6 sin6; 212 int ret; 213 214 KASSERT((fibnum < rt_numfibs), ("fib6_check_urpf: bad fibnum")); 215 rh = rt_tables_get_rnh(fibnum, AF_INET6); 216 if (rh == NULL) 217 return (0); 218 219 /* TODO: radix changes */ 220 /* Prepare lookup key */ 221 memset(&sin6, 0, sizeof(sin6)); 222 sin6.sin6_len = sizeof(struct sockaddr_in6); 223 sin6.sin6_addr = *dst6; 224 225 /* Assume scopeid is valid and embed it directly */ 226 if (IN6_IS_SCOPE_LINKLOCAL(dst6)) 227 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 228 229 RIB_RLOCK(rh); 230 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 231 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 232 ret = check_urpf(RNTORT(rn)->rt_nhop, flags, src_if); 233 RIB_RUNLOCK(rh); 234 return (ret); 235 } 236 RIB_RUNLOCK(rh); 237 238 return (0); 239 } 240 241 struct nhop_object * 242 fib6_lookup_debugnet(uint32_t fibnum, const struct in6_addr *dst6, 243 uint32_t scopeid, uint32_t flags) 244 { 245 struct rib_head *rh; 246 struct radix_node *rn; 247 struct nhop_object *nh; 248 struct sockaddr_in6 sin6; 249 250 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum")); 251 rh = rt_tables_get_rnh(fibnum, AF_INET6); 252 if (rh == NULL) 253 return (NULL); 254 255 /* TODO: radix changes */ 256 //addr = *dst6; 257 /* Prepare lookup key */ 258 memset(&sin6, 0, sizeof(sin6)); 259 sin6.sin6_len = sizeof(struct sockaddr_in6); 260 sin6.sin6_addr = *dst6; 261 262 /* Assume scopeid is valid and embed it directly */ 263 if (IN6_IS_SCOPE_LINKLOCAL(dst6)) 264 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 265 266 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 267 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 268 nh = nhop_select((RNTORT(rn))->rt_nhop, 0); 269 /* Ensure route & ifp is UP */ 270 if (RT_LINK_IS_UP(nh->nh_ifp)) { 271 if (flags & NHR_REF) 272 nhop_ref_object(nh); 273 return (nh); 274 } 275 } 276 277 return (NULL); 278 } 279 280 #endif 281