diff options
Diffstat (limited to 'freebsd/sys/netinet6/in6_fib.c')
| -rw-r--r-- | freebsd/sys/netinet6/in6_fib.c | 278 |
1 files changed, 278 insertions, 0 deletions
diff --git a/freebsd/sys/netinet6/in6_fib.c b/freebsd/sys/netinet6/in6_fib.c new file mode 100644 index 00000000..824db1fc --- /dev/null +++ b/freebsd/sys/netinet6/in6_fib.c @@ -0,0 +1,278 @@ +#include <machine/rtems-bsd-kernel-space.h> + +/*- + * Copyright (c) 2015 + * Alexander V. Chernikov <melifaro@FreeBSD.org> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <rtems/bsd/local/opt_inet.h> +#include <rtems/bsd/local/opt_inet6.h> +#include <rtems/bsd/local/opt_route.h> +#include <rtems/bsd/local/opt_mpath.h> + +#include <rtems/bsd/sys/param.h> +#include <sys/systm.h> +#include <rtems/bsd/sys/lock.h> +#include <sys/rwlock.h> +#include <sys/malloc.h> +#include <sys/mbuf.h> +#include <sys/socket.h> +#include <sys/sysctl.h> +#include <sys/kernel.h> + +#include <net/if.h> +#include <net/if_var.h> +#include <net/if_dl.h> +#include <net/route.h> +#include <net/route_var.h> +#include <net/vnet.h> + +#ifdef RADIX_MPATH +#include <net/radix_mpath.h> +#endif + +#include <netinet/in.h> +#include <netinet/in_var.h> +#include <netinet/ip_mroute.h> +#include <netinet/ip6.h> +#include <netinet6/in6_fib.h> +#include <netinet6/in6_var.h> +#include <netinet6/nd6.h> +#include <netinet6/scope6_var.h> + +#include <net/if_types.h> + +#ifdef INET6 +static void fib6_rte_to_nh_extended(struct rtentry *rte, + const struct in6_addr *dst, uint32_t flags, struct nhop6_extended *pnh6); +static void fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst, + uint32_t flags, struct nhop6_basic *pnh6); +static struct ifnet *fib6_get_ifaifp(struct rtentry *rte); +#define RNTORT(p) ((struct rtentry *)(p)) + +/* + * Gets real interface for the @rte. + * Returns rt_ifp for !IFF_LOOPBACK routers. + * Extracts "real" address interface from interface address + * loopback routes. + */ +static struct ifnet * +fib6_get_ifaifp(struct rtentry *rte) +{ + struct ifnet *ifp; + struct sockaddr_dl *sdl; + + ifp = rte->rt_ifp; + if ((ifp->if_flags & IFF_LOOPBACK) && + rte->rt_gateway->sa_family == AF_LINK) { + sdl = (struct sockaddr_dl *)rte->rt_gateway; + return (ifnet_byindex(sdl->sdl_index)); + } + + return (ifp); +} + +static void +fib6_rte_to_nh_basic(struct rtentry *rte, const struct in6_addr *dst, + uint32_t flags, struct nhop6_basic *pnh6) +{ + struct sockaddr_in6 *gw; + + /* Do explicit nexthop zero unless we're copying it */ + memset(pnh6, 0, sizeof(*pnh6)); + + if ((flags & NHR_IFAIF) != 0) + pnh6->nh_ifp = fib6_get_ifaifp(rte); + else + pnh6->nh_ifp = rte->rt_ifp; + + pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp)); + if (rte->rt_flags & RTF_GATEWAY) { + gw = (struct sockaddr_in6 *)rte->rt_gateway; + pnh6->nh_addr = gw->sin6_addr; + in6_clearscope(&pnh6->nh_addr); + } else + pnh6->nh_addr = *dst; + /* Set flags */ + pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags); + gw = (struct sockaddr_in6 *)rt_key(rte); + if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr)) + pnh6->nh_flags |= NHF_DEFAULT; +} + +static void +fib6_rte_to_nh_extended(struct rtentry *rte, const struct in6_addr *dst, + uint32_t flags, struct nhop6_extended *pnh6) +{ + struct sockaddr_in6 *gw; + + /* Do explicit nexthop zero unless we're copying it */ + memset(pnh6, 0, sizeof(*pnh6)); + + if ((flags & NHR_IFAIF) != 0) + pnh6->nh_ifp = fib6_get_ifaifp(rte); + else + pnh6->nh_ifp = rte->rt_ifp; + + pnh6->nh_mtu = min(rte->rt_mtu, IN6_LINKMTU(rte->rt_ifp)); + if (rte->rt_flags & RTF_GATEWAY) { + gw = (struct sockaddr_in6 *)rte->rt_gateway; + pnh6->nh_addr = gw->sin6_addr; + in6_clearscope(&pnh6->nh_addr); + } else + pnh6->nh_addr = *dst; + /* Set flags */ + pnh6->nh_flags = fib_rte_to_nh_flags(rte->rt_flags); + gw = (struct sockaddr_in6 *)rt_key(rte); + if (IN6_IS_ADDR_UNSPECIFIED(&gw->sin6_addr)) + pnh6->nh_flags |= NHF_DEFAULT; +} + +/* + * Performs IPv6 route table lookup on @dst. Returns 0 on success. + * Stores basic nexthop info into provided @pnh6 structure. + * Note that + * - nh_ifp represents logical transmit interface (rt_ifp) by default + * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed + * - mtu from logical transmit interface will be returned. + * - nh_ifp cannot be safely dereferenced + * - nh_ifp represents rt_ifp (e.g. if looking up address on + * interface "ix0" pointer to "ix0" interface will be returned instead + * of "lo0") + * - howewer mtu from "transmit" interface will be returned. + * - scope will be embedded in nh_addr + */ +int +fib6_lookup_nh_basic(uint32_t fibnum, const struct in6_addr *dst, uint32_t scopeid, + uint32_t flags, uint32_t flowid, struct nhop6_basic *pnh6) +{ + struct rib_head *rh; + struct radix_node *rn; + struct sockaddr_in6 sin6; + struct rtentry *rte; + + KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_basic: bad fibnum")); + rh = rt_tables_get_rnh(fibnum, AF_INET6); + if (rh == NULL) + return (ENOENT); + + /* Prepare lookup key */ + memset(&sin6, 0, sizeof(sin6)); + sin6.sin6_addr = *dst; + sin6.sin6_len = sizeof(struct sockaddr_in6); + /* Assume scopeid is valid and embed it directly */ + if (IN6_IS_SCOPE_LINKLOCAL(dst)) + sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); + + RIB_RLOCK(rh); + rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); + if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { + rte = RNTORT(rn); + /* Ensure route & ifp is UP */ + if (RT_LINK_IS_UP(rte->rt_ifp)) { + fib6_rte_to_nh_basic(rte, &sin6.sin6_addr, flags, pnh6); + RIB_RUNLOCK(rh); + return (0); + } + } + RIB_RUNLOCK(rh); + + return (ENOENT); +} + +/* + * Performs IPv6 route table lookup on @dst. Returns 0 on success. + * Stores extended nexthop info into provided @pnh6 structure. + * Note that + * - nh_ifp cannot be safely dereferenced unless NHR_REF is specified. + * - in that case you need to call fib6_free_nh_ext() + * - nh_ifp represents logical transmit interface (rt_ifp) by default + * - nh_ifp represents "address" interface if NHR_IFAIF flag is passed + * - mtu from logical transmit interface will be returned. + * - scope will be embedded in nh_addr + */ +int +fib6_lookup_nh_ext(uint32_t fibnum, const struct in6_addr *dst,uint32_t scopeid, + uint32_t flags, uint32_t flowid, struct nhop6_extended *pnh6) +{ + struct rib_head *rh; + struct radix_node *rn; + struct sockaddr_in6 sin6; + struct rtentry *rte; + + KASSERT((fibnum < rt_numfibs), ("fib6_lookup_nh_ext: bad fibnum")); + rh = rt_tables_get_rnh(fibnum, AF_INET6); + if (rh == NULL) + return (ENOENT); + + /* Prepare lookup key */ + memset(&sin6, 0, sizeof(sin6)); + sin6.sin6_len = sizeof(struct sockaddr_in6); + sin6.sin6_addr = *dst; + /* Assume scopeid is valid and embed it directly */ + if (IN6_IS_SCOPE_LINKLOCAL(dst)) + sin6.sin6_addr.s6_addr16[1] = htons(scopeid & 0xffff); + + RIB_RLOCK(rh); + rn = rh->rnh_matchaddr((void *)&sin6, &rh->head); + if (rn != NULL && ((rn->rn_flags & RNF_ROOT) == 0)) { + rte = RNTORT(rn); +#ifdef RADIX_MPATH + rte = rt_mpath_select(rte, flowid); + if (rte == NULL) { + RIB_RUNLOCK(rh); + return (ENOENT); + } +#endif + /* Ensure route & ifp is UP */ + if (RT_LINK_IS_UP(rte->rt_ifp)) { + fib6_rte_to_nh_extended(rte, &sin6.sin6_addr, flags, + pnh6); + if ((flags & NHR_REF) != 0) { + /* TODO: Do lwref on egress ifp's */ + } + RIB_RUNLOCK(rh); + + return (0); + } + } + RIB_RUNLOCK(rh); + + return (ENOENT); +} + +void +fib6_free_nh_ext(uint32_t fibnum, struct nhop6_extended *pnh6) +{ + +} + +#endif + |