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 #include "opt_mpath.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/lock.h> 41 #include <sys/rmlock.h> 42 #include <sys/malloc.h> 43 #include <sys/mbuf.h> 44 #include <sys/socket.h> 45 #include <sys/sysctl.h> 46 #include <sys/kernel.h> 47 48 #include <net/if.h> 49 #include <net/if_var.h> 50 #include <net/if_dl.h> 51 #include <net/route.h> 52 #include <net/route/route_var.h> 53 #include <net/route/nhop.h> 54 #include <net/vnet.h> 55 56 #ifdef RADIX_MPATH 57 #include <net/radix_mpath.h> 58 #endif 59 60 #include <netinet/in.h> 61 #include <netinet/in_var.h> 62 #include <netinet/ip_mroute.h> 63 #include <netinet/ip6.h> 64 #include <netinet6/in6_fib.h> 65 #include <netinet6/in6_var.h> 66 #include <netinet6/nd6.h> 67 #include <netinet6/scope6_var.h> 68 69 #include <net/if_types.h> 70 71 #ifdef INET6 72 73 CHK_STRUCT_ROUTE_COMPAT(struct route_in6, ro_dst); 74 75 /* 76 * Looks up path in fib @fibnum specified by @dst. 77 * Assumes scope is deembedded and provided in @scopeid. 78 * 79 * Returns path nexthop on success. Nexthop is safe to use 80 * within the current network epoch. If longer lifetime is required, 81 * one needs to pass NHR_REF as a flag. This will return referenced 82 * nexthop. 83 */ 84 struct nhop_object * 85 fib6_lookup(uint32_t fibnum, const struct in6_addr *dst6, 86 uint32_t scopeid, uint32_t flags, uint32_t flowid) 87 { 88 RIB_RLOCK_TRACKER; 89 struct rib_head *rh; 90 struct radix_node *rn; 91 struct rtentry *rt; 92 struct nhop_object *nh; 93 struct sockaddr_in6 sin6; 94 95 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum")); 96 rh = rt_tables_get_rnh(fibnum, AF_INET6); 97 if (rh == NULL) 98 return (NULL); 99 100 /* TODO: radix changes */ 101 //addr = *dst6; 102 /* Prepare lookup key */ 103 memset(&sin6, 0, sizeof(sin6)); 104 sin6.sin6_len = sizeof(struct sockaddr_in6); 105 sin6.sin6_addr = *dst6; 106 107 /* Assume scopeid is valid and embed it directly */ 108 if (IN6_IS_SCOPE_LINKLOCAL(dst6)) 109 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 110 111 RIB_RLOCK(rh); 112 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 113 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 114 rt = RNTORT(rn); 115 #ifdef RADIX_MPATH 116 if (rt_mpath_next(rt) != NULL) 117 rt = rt_mpath_selectrte(rt, flowid); 118 #endif 119 nh = rt->rt_nhop; 120 /* Ensure route & ifp is UP */ 121 if (RT_LINK_IS_UP(nh->nh_ifp)) { 122 if (flags & NHR_REF) 123 nhop_ref_object(nh); 124 RIB_RUNLOCK(rh); 125 return (nh); 126 } 127 } 128 RIB_RUNLOCK(rh); 129 130 RTSTAT_INC(rts_unreach); 131 return (NULL); 132 } 133 134 inline static int 135 check_urpf(const struct nhop_object *nh, uint32_t flags, 136 const struct ifnet *src_if) 137 { 138 139 if (src_if != NULL && nh->nh_aifp == src_if) { 140 return (1); 141 } 142 if (src_if == NULL) { 143 if ((flags & NHR_NODEFAULT) == 0) 144 return (1); 145 else if ((nh->nh_flags & NHF_DEFAULT) == 0) 146 return (1); 147 } 148 149 return (0); 150 } 151 152 #ifdef RADIX_MPATH 153 inline static int 154 check_urpf_mpath(struct rtentry *rt, uint32_t flags, 155 const struct ifnet *src_if) 156 { 157 158 while (rt != NULL) { 159 if (check_urpf(rt->rt_nhop, flags, src_if) != 0) 160 return (1); 161 rt = rt_mpath_next(rt); 162 } 163 164 return (0); 165 } 166 #endif 167 168 /* 169 * Performs reverse path forwarding lookup. 170 * If @src_if is non-zero, verifies that at least 1 path goes via 171 * this interface. 172 * If @src_if is zero, verifies that route exist. 173 * if @flags contains NHR_NOTDEFAULT, do not consider default route. 174 * 175 * Returns 1 if route matching conditions is found, 0 otherwise. 176 */ 177 int 178 fib6_check_urpf(uint32_t fibnum, const struct in6_addr *dst6, 179 uint32_t scopeid, uint32_t flags, const struct ifnet *src_if) 180 { 181 RIB_RLOCK_TRACKER; 182 struct rib_head *rh; 183 struct radix_node *rn; 184 struct rtentry *rt; 185 struct sockaddr_in6 sin6; 186 int ret; 187 188 KASSERT((fibnum < rt_numfibs), ("fib6_check_urpf: bad fibnum")); 189 rh = rt_tables_get_rnh(fibnum, AF_INET6); 190 if (rh == NULL) 191 return (0); 192 193 /* TODO: radix changes */ 194 /* Prepare lookup key */ 195 memset(&sin6, 0, sizeof(sin6)); 196 sin6.sin6_len = sizeof(struct sockaddr_in6); 197 sin6.sin6_addr = *dst6; 198 199 /* Assume scopeid is valid and embed it directly */ 200 if (IN6_IS_SCOPE_LINKLOCAL(dst6)) 201 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 202 203 RIB_RLOCK(rh); 204 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 205 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 206 rt = RNTORT(rn); 207 #ifdef RADIX_MPATH 208 ret = check_urpf_mpath(rt, flags, src_if); 209 #else 210 ret = check_urpf(rt->rt_nhop, flags, src_if); 211 #endif 212 RIB_RUNLOCK(rh); 213 return (ret); 214 } 215 RIB_RUNLOCK(rh); 216 217 return (0); 218 } 219 220 struct nhop_object * 221 fib6_lookup_debugnet(uint32_t fibnum, const struct in6_addr *dst6, 222 uint32_t scopeid, uint32_t flags) 223 { 224 struct rib_head *rh; 225 struct radix_node *rn; 226 struct rtentry *rt; 227 struct nhop_object *nh; 228 struct sockaddr_in6 sin6; 229 230 KASSERT((fibnum < rt_numfibs), ("fib6_lookup: bad fibnum")); 231 rh = rt_tables_get_rnh(fibnum, AF_INET6); 232 if (rh == NULL) 233 return (NULL); 234 235 /* TODO: radix changes */ 236 //addr = *dst6; 237 /* Prepare lookup key */ 238 memset(&sin6, 0, sizeof(sin6)); 239 sin6.sin6_len = sizeof(struct sockaddr_in6); 240 sin6.sin6_addr = *dst6; 241 242 /* Assume scopeid is valid and embed it directly */ 243 if (IN6_IS_SCOPE_LINKLOCAL(dst6)) 244 sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); 245 246 rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); 247 if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { 248 rt = RNTORT(rn); 249 nh = rt->rt_nhop; 250 /* Ensure route & ifp is UP */ 251 if (RT_LINK_IS_UP(nh->nh_ifp)) { 252 if (flags & NHR_REF) 253 nhop_ref_object(nh); 254 return (nh); 255 } 256 } 257 258 return (NULL); 259 } 260 261 #endif 262