/**************************************************************************** * net/route/net_del_fileroute.c * * Copyright (C) 2017-2018 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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. * 3. Neither the name NuttX 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 COPYRIGHT HOLDERS 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 * COPYRIGHT OWNER 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include "route/fileroute.h" #include "route/cacheroute.h" #include "route/route.h" #if defined(CONFIG_ROUTE_IPv4_FILEROUTE) || defined(CONFIG_ROUTE_IPv6_FILEROUTE) /**************************************************************************** * Private Types ****************************************************************************/ #ifdef CONFIG_ROUTE_IPv4_FILEROUTE struct route_match_ipv4_s { in_addr_t target; /* The target IP address to match */ in_addr_t netmask; /* The network mask to match */ unsigned int index; /* Index of match */ }; #endif #ifdef CONFIG_ROUTE_IPv6_FILEROUTE struct route_match_ipv6_s { net_ipv6addr_t target; /* The target IP address to match */ net_ipv6addr_t netmask; /* The network mask to match */ unsigned int index; /* Index of match */ }; #endif /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: net_match_ipv4 * * Description: * Return 1 if the route is available * * Input Parameters: * route - The next route to examine * arg - The match values (cast to void*) * * Returned Value: * 0 if the entry is not a match; 1 if the entry matched and was cleared. * ****************************************************************************/ #ifdef CONFIG_ROUTE_IPv4_FILEROUTE static int net_match_ipv4(FAR struct net_route_ipv4_s *route, FAR void *arg) { FAR struct route_match_ipv4_s *match = (FAR struct route_match_ipv4_s *)arg; /* To match, the masked target address must be the same, and the masks * must be the same. */ net_ipv4_dumproute("Comparing", route); ninfo("With:\n"); ninfo(" target=%08lx netmask=%08lx\n", htonl(match->target), htonl(match->netmask)); if (net_ipv4addr_maskcmp(route->target, match->target, match->netmask) && net_ipv4addr_cmp(route->netmask, match->netmask)) { /* They match.. a non-zero value to terminate the traversal. The last * value of index is the index to the matching entry. */ return 1; } /* Next time we are here, this will be the routing table index */ match->index++; return 0; } #endif #ifdef CONFIG_ROUTE_IPv6_FILEROUTE static int net_match_ipv6(FAR struct net_route_ipv6_s *route, FAR void *arg) { FAR struct route_match_ipv6_s *match = (FAR struct route_match_ipv6_s *)arg; /* To match, the masked target address must be the same, and the masks * must be the same. */ net_ipv6_dumproute("Comparing", route); ninfo("With:\n"); ninfo(" target: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", htons(match->target[0]), htons(match->target[1]), htons(match->target[2]), htons(match->target[3]), htons(match->target[4]), htons(match->target[5]), htons(match->target[6]), htons(match->target[7])); ninfo(" netmask: %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", htons(match->netmask[0]), htons(match->netmask[1]), htons(match->netmask[2]), htons(match->netmask[3]), htons(match->netmask[4]), htons(match->netmask[5]), htons(match->netmask[6]), htons(match->netmask[7])); if (net_ipv6addr_maskcmp(route->target, match->target, match->netmask) && net_ipv6addr_cmp(route->netmask, match->netmask)) { /* They match.. a non-zero value to terminate the traversal. The last * value of index is the index to the matching entry. */ return 1; } /* Next time we are here, this will be the routing table index */ match->index++; return 0; } #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: net_delroute_ipv4 and net_delroute_ipv6 * * Description: * Remove an existing route from the routing table * * Input Parameters: * * Returned Value: * OK on success; Negated errno on failure. * ****************************************************************************/ #ifdef CONFIG_ROUTE_IPv4_FILEROUTE int net_delroute_ipv4(in_addr_t target, in_addr_t netmask) { struct route_match_ipv4_s match; struct net_route_ipv4_s route; struct file fshandle; off_t filesize; ssize_t nwritten; ssize_t nread; off_t pos; int nentries; int index; int ret; /* We must lock out other accesses to the routing table while we remove * entry */ ret = net_lockroute_ipv4(); if (ret < 0) { nerr("ERROR: net_lockroute_ipv4 faled: %d\n", ret); return ret; } /* Get the size of the routing table (in entries) */ nentries = net_routesize_ipv4(); if (nentries < 0) { ret = nentries; goto errout_with_lock; } else if (nentries == 0) { ret = -ENOENT; goto errout_with_lock; } /* Set up the comparison structure */ net_ipv4addr_copy(match.target, target); net_ipv4addr_copy(match.netmask, netmask); match.index = 0; /* Then find the index into the routing table where the match can be found */ ret = net_foreachroute_ipv4(net_match_ipv4, &match); if (ret < 0) { /* And error occurred */ goto errout_with_lock; } else if (ret == 0) { /* No match found */ ret = -ENOENT; goto errout_with_lock; } /* Open the routing table for read/write access */ ret = net_openroute_ipv4(O_RDWR, &fshandle); if (ret < 0) { nerr("ERROR: Could not open IPv4 routing table: %d\n", ret); goto errout_with_lock; } #ifdef CONFIG_ROUTE_IPv4_CACHEROUTE /* We are committed to modifying the routing table. Flush the in-memory * routing table cache. */ net_flushcache_ipv4(); #endif /* Loop, copying each entry, to the previous entry thus removing the entry * to be deleted. */ for (index = match.index + 1; index < nentries; index++) { /* Seek to the current entry to be moved */ pos = net_seekroute_ipv4(&fshandle, index); if (pos < 0) { nerr("ERROR: net_readroute_ipv4 failed: %ld\n", (long)pos); ret = (int)pos; goto errout_with_fshandle; } /* Read the routing table entry at this position */ nread = net_readroute_ipv4(&fshandle, &route); if (nread < 0) { nerr("ERROR: net_readroute_ipv4 failed: %ld\n", (long)nread); ret = (int)nread; goto errout_with_fshandle; } else if (nread == 0) { nerr("ERROR: Unexpected end of file\n"); ret = -EINVAL; goto errout_with_fshandle; } /* Seek to the previous entry to be replaced */ pos = net_seekroute_ipv4(&fshandle, index - 1); if (pos < 0) { nerr("ERROR: net_readroute_ipv4 failed: %ld\n", (long)pos); ret = (int)pos; goto errout_with_fshandle; } /* Now write the record to its new location */ nwritten = net_writeroute_ipv4(&fshandle, &route); if (nwritten < 0) { nerr("ERROR: net_readroute_ipv4 failed: %ld\n", (long)nwritten); ret = (int)nwritten; goto errout_with_fshandle; } } /* Now truncate the one duplicate entry at the end of the file. This may * result in a zero length file. */ filesize = (nentries - 1) * sizeof(struct net_route_ipv4_s); ret = file_truncate(&fshandle, filesize); errout_with_fshandle: net_closeroute_ipv4(&fshandle); errout_with_lock: net_unlockroute_ipv4(); return ret; } #endif #ifdef CONFIG_ROUTE_IPv6_FILEROUTE int net_delroute_ipv6(net_ipv6addr_t target, net_ipv6addr_t netmask) { struct route_match_ipv6_s match; struct net_route_ipv6_s route; struct file fshandle; off_t filesize; ssize_t nwritten; ssize_t nread; off_t pos; int nentries; int index; int ret; /* We must lock out other accesses to the routing table while we remove * entry */ ret = net_lockroute_ipv6(); if (ret < 0) { nerr("ERROR: net_lockroute_ipv6 failed: %d\n", ret); return ret; } /* Get the size of the routing table (in entries) */ nentries = net_routesize_ipv6(); if (nentries < 0) { ret = nentries; goto errout_with_lock; } else if (nentries == 0) { ret = -ENOENT; goto errout_with_lock; } /* Set up the comparison structure */ net_ipv6addr_copy(match.target, target); net_ipv6addr_copy(match.netmask, netmask); match.index = 0; /* Then find the index into the routing table where the match can be found */ ret = net_foreachroute_ipv6(net_match_ipv6, &match); if (ret < 0) { /* And error occurred */ ret = ret; goto errout_with_lock; } else if (ret == 0) { /* No match found */ ret = -ENOENT; goto errout_with_lock; } /* Open the routing table for read/write access */ ret = net_openroute_ipv6(O_RDWR, &fshandle); if (ret < 0) { nerr("ERROR: Could not open IPv6 routing table: %d\n", ret); goto errout_with_lock; } #ifdef CONFIG_ROUTE_IPv6_CACHEROUTE /* We are committed to modifying the routing table. Flush the in-memory * routing table cache. */ net_flushcache_ipv6(); #endif /* Loop, copying each entry, to the previous entry thus removing the entry * to be deleted. */ for (index = match.index + 1; index < nentries; index++) { /* Seek to the current entry to be moved */ pos = net_seekroute_ipv6(&fshandle, index); if (pos < 0) { nerr("ERROR: net_readroute_ipv6 failed: %ld\n", (long)pos); ret = (int)pos; goto errout_with_fshandle; } /* Read the routing table entry at this position */ nread = net_readroute_ipv6(&fshandle, &route); if (nread < 0) { nerr("ERROR: net_readroute_ipv6 failed: %ld\n", (long)nread); ret = (int)nread; goto errout_with_fshandle; } else if (nread == 0) { nerr("ERROR: Unexpected end of file\n"); ret = -EINVAL; goto errout_with_fshandle; } /* Seek to the previous entry to be replaced */ pos = net_seekroute_ipv6(&fshandle, index - 1); if (pos < 0) { nerr("ERROR: net_readroute_ipv6 failed: %ld\n", (long)pos); ret = (int)pos; goto errout_with_fshandle; } /* Now write the record to its new location */ nwritten = net_writeroute_ipv6(&fshandle, &route); if (nwritten < 0) { nerr("ERROR: net_readroute_ipv6 failed: %ld\n", (long)nwritten); ret = (int)nwritten; goto errout_with_fshandle; } } /* Now truncate the one duplicate entry at the end of the file. This may * result in a zero length file. */ filesize = (nentries - 1) * sizeof(struct net_route_ipv6_s); ret = file_truncate(&fshandle, filesize); errout_with_fshandle: net_closeroute_ipv6(&fshandle); errout_with_lock: net_unlockroute_ipv6(); return ret; } #endif #endif /* CONFIG_ROUTE_IPv4_FILEROUTE || CONFIG_ROUTE_IPv6_FILEROUTE */