| /* |
| * OpenVPN -- An application to securely tunnel IP networks |
| * over a single TCP/UDP port, with support for SSL/TLS-based |
| * session authentication and key exchange, |
| * packet encryption, packet authentication, and |
| * packet compression. |
| * |
| * Copyright (C) 2002-2018 OpenVPN Inc <sales@openvpn.net> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| */ |
| |
| /* |
| * Support routines for adding/deleting network routes. |
| */ |
| |
| #ifdef HAVE_CONFIG_H |
| #include "config.h" |
| #elif defined(_MSC_VER) |
| #include "config-msvc.h" |
| #endif |
| |
| #include "syshead.h" |
| |
| #include "common.h" |
| #include "error.h" |
| #include "route.h" |
| #include "run_command.h" |
| #include "socket.h" |
| #include "manage.h" |
| #include "win32.h" |
| #include "options.h" |
| #include "networking.h" |
| |
| #include "memdbg.h" |
| |
| #if defined(TARGET_LINUX) || defined(TARGET_ANDROID) |
| #include <linux/rtnetlink.h> /* RTM_GETROUTE etc. */ |
| #endif |
| |
| #if defined(TARGET_NETBSD) |
| #include <net/route.h> /* RT_ROUNDUP(), RT_ADVANCE() */ |
| #endif |
| |
| #ifdef _WIN32 |
| #include "openvpn-msg.h" |
| |
| #define METRIC_NOT_USED ((DWORD)-1) |
| static bool add_route_service(const struct route_ipv4 *, const struct tuntap *); |
| |
| static bool del_route_service(const struct route_ipv4 *, const struct tuntap *); |
| |
| static bool add_route_ipv6_service(const struct route_ipv6 *, const struct tuntap *); |
| |
| static bool del_route_ipv6_service(const struct route_ipv6 *, const struct tuntap *); |
| |
| #endif |
| |
| static void delete_route(struct route_ipv4 *r, const struct tuntap *tt, unsigned int flags, const struct route_gateway_info *rgi, const struct env_set *es, openvpn_net_ctx_t *ctx); |
| |
| static void get_bypass_addresses(struct route_bypass *rb, const unsigned int flags); |
| |
| #ifdef ENABLE_DEBUG |
| |
| static void |
| print_bypass_addresses(const struct route_bypass *rb) |
| { |
| struct gc_arena gc = gc_new(); |
| int i; |
| for (i = 0; i < rb->n_bypass; ++i) |
| { |
| msg(D_ROUTE, "ROUTE: bypass_host_route[%d]=%s", |
| i, |
| print_in_addr_t(rb->bypass[i], 0, &gc)); |
| } |
| gc_free(&gc); |
| } |
| |
| #endif |
| |
| static bool |
| add_bypass_address(struct route_bypass *rb, const in_addr_t a) |
| { |
| int i; |
| for (i = 0; i < rb->n_bypass; ++i) |
| { |
| if (a == rb->bypass[i]) /* avoid duplicates */ |
| { |
| return true; |
| } |
| } |
| if (rb->n_bypass < N_ROUTE_BYPASS) |
| { |
| rb->bypass[rb->n_bypass++] = a; |
| return true; |
| } |
| else |
| { |
| return false; |
| } |
| } |
| |
| struct route_option_list * |
| new_route_option_list(struct gc_arena *a) |
| { |
| struct route_option_list *ret; |
| ALLOC_OBJ_CLEAR_GC(ret, struct route_option_list, a); |
| ret->gc = a; |
| return ret; |
| } |
| |
| struct route_ipv6_option_list * |
| new_route_ipv6_option_list(struct gc_arena *a) |
| { |
| struct route_ipv6_option_list *ret; |
| ALLOC_OBJ_CLEAR_GC(ret, struct route_ipv6_option_list, a); |
| ret->gc = a; |
| return ret; |
| } |
| |
| /* |
| * NOTE: structs are cloned/copied shallow by design. |
| * The routes list from src will stay intact since it is allocated using |
| * the options->gc. The cloned/copied lists will share this common tail |
| * to avoid copying the data around between pulls. Pulled routes use |
| * the c2->gc so they get freed immediately after a reconnect. |
| */ |
| struct route_option_list * |
| clone_route_option_list(const struct route_option_list *src, struct gc_arena *a) |
| { |
| struct route_option_list *ret; |
| ALLOC_OBJ_GC(ret, struct route_option_list, a); |
| *ret = *src; |
| return ret; |
| } |
| |
| struct route_ipv6_option_list * |
| clone_route_ipv6_option_list(const struct route_ipv6_option_list *src, struct gc_arena *a) |
| { |
| struct route_ipv6_option_list *ret; |
| ALLOC_OBJ_GC(ret, struct route_ipv6_option_list, a); |
| *ret = *src; |
| return ret; |
| } |
| |
| void |
| copy_route_option_list(struct route_option_list *dest, const struct route_option_list *src, struct gc_arena *a) |
| { |
| *dest = *src; |
| dest->gc = a; |
| } |
| |
| void |
| copy_route_ipv6_option_list(struct route_ipv6_option_list *dest, |
| const struct route_ipv6_option_list *src, |
| struct gc_arena *a) |
| { |
| *dest = *src; |
| dest->gc = a; |
| } |
| |
| static const char * |
| route_string(const struct route_ipv4 *r, struct gc_arena *gc) |
| { |
| struct buffer out = alloc_buf_gc(256, gc); |
| buf_printf(&out, "ROUTE network %s netmask %s gateway %s", |
| print_in_addr_t(r->network, 0, gc), |
| print_in_addr_t(r->netmask, 0, gc), |
| print_in_addr_t(r->gateway, 0, gc) |
| ); |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| buf_printf(&out, " metric %d", r->metric); |
| } |
| return BSTR(&out); |
| } |
| |
| static bool |
| is_route_parm_defined(const char *parm) |
| { |
| if (!parm) |
| { |
| return false; |
| } |
| if (!strcmp(parm, "default")) |
| { |
| return false; |
| } |
| return true; |
| } |
| |
| static void |
| setenv_route_addr(struct env_set *es, const char *key, const in_addr_t addr, int i) |
| { |
| struct gc_arena gc = gc_new(); |
| struct buffer name = alloc_buf_gc(256, &gc); |
| if (i >= 0) |
| { |
| buf_printf(&name, "route_%s_%d", key, i); |
| } |
| else |
| { |
| buf_printf(&name, "route_%s", key); |
| } |
| setenv_str(es, BSTR(&name), print_in_addr_t(addr, 0, &gc)); |
| gc_free(&gc); |
| } |
| |
| static bool |
| get_special_addr(const struct route_list *rl, |
| const char *string, |
| in_addr_t *out, |
| bool *status) |
| { |
| if (status) |
| { |
| *status = true; |
| } |
| if (!strcmp(string, "vpn_gateway")) |
| { |
| if (rl) |
| { |
| if (rl->spec.flags & RTSA_REMOTE_ENDPOINT) |
| { |
| *out = rl->spec.remote_endpoint; |
| } |
| else |
| { |
| msg(M_INFO, PACKAGE_NAME " ROUTE: vpn_gateway undefined"); |
| if (status) |
| { |
| *status = false; |
| } |
| } |
| } |
| return true; |
| } |
| else if (!strcmp(string, "net_gateway")) |
| { |
| if (rl) |
| { |
| if (rl->rgi.flags & RGI_ADDR_DEFINED) |
| { |
| *out = rl->rgi.gateway.addr; |
| } |
| else |
| { |
| msg(M_INFO, PACKAGE_NAME " ROUTE: net_gateway undefined -- unable to get default gateway from system"); |
| if (status) |
| { |
| *status = false; |
| } |
| } |
| } |
| return true; |
| } |
| else if (!strcmp(string, "remote_host")) |
| { |
| if (rl) |
| { |
| if (rl->spec.flags & RTSA_REMOTE_HOST) |
| { |
| *out = rl->spec.remote_host; |
| } |
| else |
| { |
| msg(M_INFO, PACKAGE_NAME " ROUTE: remote_host undefined"); |
| if (status) |
| { |
| *status = false; |
| } |
| } |
| } |
| return true; |
| } |
| return false; |
| } |
| |
| bool |
| is_special_addr(const char *addr_str) |
| { |
| if (addr_str) |
| { |
| return get_special_addr(NULL, addr_str, NULL, NULL); |
| } |
| else |
| { |
| return false; |
| } |
| } |
| |
| static bool |
| init_route(struct route_ipv4 *r, |
| struct addrinfo **network_list, |
| const struct route_option *ro, |
| const struct route_list *rl) |
| { |
| const in_addr_t default_netmask = IPV4_NETMASK_HOST; |
| bool status; |
| int ret; |
| struct in_addr special; |
| |
| CLEAR(*r); |
| r->option = ro; |
| |
| /* network */ |
| |
| if (!is_route_parm_defined(ro->network)) |
| { |
| goto fail; |
| } |
| |
| |
| /* get_special_addr replaces specialaddr with a special ip addr |
| * like gw. getaddrinfo is called to convert a a addrinfo struct */ |
| |
| if (get_special_addr(rl, ro->network, (in_addr_t *) &special.s_addr, &status)) |
| { |
| if (!status) |
| { |
| goto fail; |
| } |
| special.s_addr = htonl(special.s_addr); |
| ret = openvpn_getaddrinfo(0, inet_ntoa(special), NULL, 0, NULL, |
| AF_INET, network_list); |
| } |
| else |
| { |
| ret = openvpn_getaddrinfo(GETADDR_RESOLVE | GETADDR_WARN_ON_SIGNAL, |
| ro->network, NULL, 0, NULL, AF_INET, network_list); |
| } |
| |
| status = (ret == 0); |
| |
| if (!status) |
| { |
| goto fail; |
| } |
| |
| /* netmask */ |
| |
| if (is_route_parm_defined(ro->netmask)) |
| { |
| r->netmask = getaddr( |
| GETADDR_HOST_ORDER |
| | GETADDR_WARN_ON_SIGNAL, |
| ro->netmask, |
| 0, |
| &status, |
| NULL); |
| if (!status) |
| { |
| goto fail; |
| } |
| } |
| else |
| { |
| r->netmask = default_netmask; |
| } |
| |
| /* gateway */ |
| |
| if (is_route_parm_defined(ro->gateway)) |
| { |
| if (!get_special_addr(rl, ro->gateway, &r->gateway, &status)) |
| { |
| r->gateway = getaddr( |
| GETADDR_RESOLVE |
| | GETADDR_HOST_ORDER |
| | GETADDR_WARN_ON_SIGNAL, |
| ro->gateway, |
| 0, |
| &status, |
| NULL); |
| } |
| if (!status) |
| { |
| goto fail; |
| } |
| } |
| else |
| { |
| if (rl->spec.flags & RTSA_REMOTE_ENDPOINT) |
| { |
| r->gateway = rl->spec.remote_endpoint; |
| } |
| else |
| { |
| msg(M_WARN, PACKAGE_NAME " ROUTE: " PACKAGE_NAME " needs a gateway parameter for a --route option and no default was specified by either --route-gateway or --ifconfig options"); |
| goto fail; |
| } |
| } |
| |
| /* metric */ |
| |
| r->metric = 0; |
| if (is_route_parm_defined(ro->metric)) |
| { |
| r->metric = atoi(ro->metric); |
| if (r->metric < 0) |
| { |
| msg(M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0", |
| ro->network, |
| ro->metric); |
| goto fail; |
| } |
| r->flags |= RT_METRIC_DEFINED; |
| } |
| else if (rl->spec.flags & RTSA_DEFAULT_METRIC) |
| { |
| r->metric = rl->spec.default_metric; |
| r->flags |= RT_METRIC_DEFINED; |
| } |
| |
| r->flags |= RT_DEFINED; |
| |
| return true; |
| |
| fail: |
| msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s", |
| ro->network); |
| return false; |
| } |
| |
| static bool |
| init_route_ipv6(struct route_ipv6 *r6, |
| const struct route_ipv6_option *r6o, |
| const struct route_ipv6_list *rl6 ) |
| { |
| CLEAR(*r6); |
| |
| if (!get_ipv6_addr( r6o->prefix, &r6->network, &r6->netbits, M_WARN )) |
| { |
| goto fail; |
| } |
| |
| /* gateway */ |
| if (is_route_parm_defined(r6o->gateway)) |
| { |
| if (inet_pton( AF_INET6, r6o->gateway, &r6->gateway ) != 1) |
| { |
| msg( M_WARN, PACKAGE_NAME "ROUTE6: cannot parse gateway spec '%s'", r6o->gateway ); |
| } |
| } |
| else if (rl6->spec_flags & RTSA_REMOTE_ENDPOINT) |
| { |
| r6->gateway = rl6->remote_endpoint_ipv6; |
| } |
| |
| /* metric */ |
| |
| r6->metric = -1; |
| if (is_route_parm_defined(r6o->metric)) |
| { |
| r6->metric = atoi(r6o->metric); |
| if (r6->metric < 0) |
| { |
| msg(M_WARN, PACKAGE_NAME " ROUTE: route metric for network %s (%s) must be >= 0", |
| r6o->prefix, |
| r6o->metric); |
| goto fail; |
| } |
| r6->flags |= RT_METRIC_DEFINED; |
| } |
| else if (rl6->spec_flags & RTSA_DEFAULT_METRIC) |
| { |
| r6->metric = rl6->default_metric; |
| r6->flags |= RT_METRIC_DEFINED; |
| } |
| |
| r6->flags |= RT_DEFINED; |
| |
| return true; |
| |
| fail: |
| msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve route for host/network: %s", |
| r6o->prefix); |
| return false; |
| } |
| |
| void |
| add_route_to_option_list(struct route_option_list *l, |
| const char *network, |
| const char *netmask, |
| const char *gateway, |
| const char *metric) |
| { |
| struct route_option *ro; |
| ALLOC_OBJ_GC(ro, struct route_option, l->gc); |
| ro->network = network; |
| ro->netmask = netmask; |
| ro->gateway = gateway; |
| ro->metric = metric; |
| ro->next = l->routes; |
| l->routes = ro; |
| |
| } |
| |
| void |
| add_route_ipv6_to_option_list(struct route_ipv6_option_list *l, |
| const char *prefix, |
| const char *gateway, |
| const char *metric) |
| { |
| struct route_ipv6_option *ro; |
| ALLOC_OBJ_GC(ro, struct route_ipv6_option, l->gc); |
| ro->prefix = prefix; |
| ro->gateway = gateway; |
| ro->metric = metric; |
| ro->next = l->routes_ipv6; |
| l->routes_ipv6 = ro; |
| } |
| |
| static void |
| clear_route_list(struct route_list *rl) |
| { |
| gc_free(&rl->gc); |
| CLEAR(*rl); |
| } |
| |
| static void |
| clear_route_ipv6_list(struct route_ipv6_list *rl6) |
| { |
| gc_free(&rl6->gc); |
| CLEAR(*rl6); |
| } |
| |
| void |
| route_list_add_vpn_gateway(struct route_list *rl, |
| struct env_set *es, |
| const in_addr_t addr) |
| { |
| ASSERT(rl); |
| rl->spec.remote_endpoint = addr; |
| rl->spec.flags |= RTSA_REMOTE_ENDPOINT; |
| setenv_route_addr(es, "vpn_gateway", rl->spec.remote_endpoint, -1); |
| } |
| |
| static void |
| add_block_local_item(struct route_list *rl, |
| const struct route_gateway_address *gateway, |
| in_addr_t target) |
| { |
| const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED); |
| if ((rl->rgi.flags & rgi_needed) == rgi_needed |
| && rl->rgi.gateway.netmask < 0xFFFFFFFF) |
| { |
| struct route_ipv4 *r1, *r2; |
| unsigned int l2; |
| |
| ALLOC_OBJ_GC(r1, struct route_ipv4, &rl->gc); |
| ALLOC_OBJ_GC(r2, struct route_ipv4, &rl->gc); |
| |
| /* split a route into two smaller blocking routes, and direct them to target */ |
| l2 = ((~gateway->netmask)+1)>>1; |
| r1->flags = RT_DEFINED; |
| r1->gateway = target; |
| r1->network = gateway->addr & gateway->netmask; |
| r1->netmask = ~(l2-1); |
| r1->next = rl->routes; |
| rl->routes = r1; |
| |
| *r2 = *r1; |
| r2->network += l2; |
| r2->next = rl->routes; |
| rl->routes = r2; |
| } |
| } |
| |
| static void |
| add_block_local(struct route_list *rl) |
| { |
| const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED); |
| if ((rl->flags & RG_BLOCK_LOCAL) |
| && (rl->rgi.flags & rgi_needed) == rgi_needed |
| && (rl->spec.flags & RTSA_REMOTE_ENDPOINT) |
| && rl->spec.remote_host_local != TLA_LOCAL) |
| { |
| size_t i; |
| |
| #ifndef TARGET_ANDROID |
| /* add bypass for gateway addr */ |
| add_bypass_address(&rl->spec.bypass, rl->rgi.gateway.addr); |
| #endif |
| |
| /* block access to local subnet */ |
| add_block_local_item(rl, &rl->rgi.gateway, rl->spec.remote_endpoint); |
| |
| /* process additional subnets on gateway interface */ |
| for (i = 0; i < rl->rgi.n_addrs; ++i) |
| { |
| const struct route_gateway_address *gwa = &rl->rgi.addrs[i]; |
| /* omit the add/subnet in &rl->rgi which we processed above */ |
| if (!((rl->rgi.gateway.addr & rl->rgi.gateway.netmask) == (gwa->addr & gwa->netmask) |
| && rl->rgi.gateway.netmask == gwa->netmask)) |
| { |
| add_block_local_item(rl, gwa, rl->spec.remote_endpoint); |
| } |
| } |
| } |
| } |
| |
| bool |
| init_route_list(struct route_list *rl, |
| const struct route_option_list *opt, |
| const char *remote_endpoint, |
| int default_metric, |
| in_addr_t remote_host, |
| struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc = gc_new(); |
| bool ret = true; |
| |
| clear_route_list(rl); |
| |
| rl->flags = opt->flags; |
| |
| if (remote_host != IPV4_INVALID_ADDR) |
| { |
| rl->spec.remote_host = remote_host; |
| rl->spec.flags |= RTSA_REMOTE_HOST; |
| } |
| |
| if (default_metric) |
| { |
| rl->spec.default_metric = default_metric; |
| rl->spec.flags |= RTSA_DEFAULT_METRIC; |
| } |
| |
| get_default_gateway(&rl->rgi, ctx); |
| if (rl->rgi.flags & RGI_ADDR_DEFINED) |
| { |
| setenv_route_addr(es, "net_gateway", rl->rgi.gateway.addr, -1); |
| #if defined(ENABLE_DEBUG) && !defined(ENABLE_SMALL) |
| print_default_gateway(D_ROUTE, &rl->rgi, NULL); |
| #endif |
| } |
| else |
| { |
| dmsg(D_ROUTE, "ROUTE: default_gateway=UNDEF"); |
| } |
| |
| if (rl->spec.flags & RTSA_REMOTE_HOST) |
| { |
| rl->spec.remote_host_local = test_local_addr(remote_host, &rl->rgi); |
| } |
| |
| if (is_route_parm_defined(remote_endpoint)) |
| { |
| bool defined = false; |
| rl->spec.remote_endpoint = getaddr( |
| GETADDR_RESOLVE |
| | GETADDR_HOST_ORDER |
| | GETADDR_WARN_ON_SIGNAL, |
| remote_endpoint, |
| 0, |
| &defined, |
| NULL); |
| |
| if (defined) |
| { |
| setenv_route_addr(es, "vpn_gateway", rl->spec.remote_endpoint, -1); |
| rl->spec.flags |= RTSA_REMOTE_ENDPOINT; |
| } |
| else |
| { |
| msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve default gateway: %s", |
| remote_endpoint); |
| ret = false; |
| } |
| } |
| |
| if (rl->flags & RG_ENABLE) |
| { |
| add_block_local(rl); |
| get_bypass_addresses(&rl->spec.bypass, rl->flags); |
| #ifdef ENABLE_DEBUG |
| print_bypass_addresses(&rl->spec.bypass); |
| #endif |
| } |
| |
| /* parse the routes from opt to rl */ |
| { |
| struct route_option *ro; |
| for (ro = opt->routes; ro; ro = ro->next) |
| { |
| struct addrinfo *netlist = NULL; |
| struct route_ipv4 r; |
| |
| if (!init_route(&r, &netlist, ro, rl)) |
| { |
| ret = false; |
| } |
| else |
| { |
| struct addrinfo *curele; |
| for (curele = netlist; curele; curele = curele->ai_next) |
| { |
| struct route_ipv4 *new; |
| ALLOC_OBJ_GC(new, struct route_ipv4, &rl->gc); |
| *new = r; |
| new->network = ntohl(((struct sockaddr_in *)curele->ai_addr)->sin_addr.s_addr); |
| new->next = rl->routes; |
| rl->routes = new; |
| } |
| } |
| if (netlist) |
| { |
| gc_addspecial(netlist, &gc_freeaddrinfo_callback, &gc); |
| } |
| } |
| } |
| |
| gc_free(&gc); |
| return ret; |
| } |
| |
| /* check whether an IPv6 host address is covered by a given route_ipv6 |
| * (not the most beautiful implementation in the world, but portable and |
| * "good enough") |
| */ |
| static bool |
| route_ipv6_match_host( const struct route_ipv6 *r6, |
| const struct in6_addr *host ) |
| { |
| unsigned int bits = r6->netbits; |
| int i; |
| unsigned int mask; |
| |
| if (bits>128) |
| { |
| return false; |
| } |
| |
| for (i = 0; bits >= 8; i++, bits -= 8) |
| { |
| if (r6->network.s6_addr[i] != host->s6_addr[i]) |
| { |
| return false; |
| } |
| } |
| |
| if (bits == 0) |
| { |
| return true; |
| } |
| |
| mask = 0xff << (8-bits); |
| |
| if ( (r6->network.s6_addr[i] & mask) == (host->s6_addr[i] & mask )) |
| { |
| return true; |
| } |
| |
| return false; |
| } |
| |
| bool |
| init_route_ipv6_list(struct route_ipv6_list *rl6, |
| const struct route_ipv6_option_list *opt6, |
| const char *remote_endpoint, |
| int default_metric, |
| const struct in6_addr *remote_host_ipv6, |
| struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc = gc_new(); |
| bool ret = true; |
| bool need_remote_ipv6_route; |
| |
| clear_route_ipv6_list(rl6); |
| |
| rl6->flags = opt6->flags; |
| |
| if (remote_host_ipv6) |
| { |
| rl6->remote_host_ipv6 = *remote_host_ipv6; |
| rl6->spec_flags |= RTSA_REMOTE_HOST; |
| } |
| |
| if (default_metric >= 0) |
| { |
| rl6->default_metric = default_metric; |
| rl6->spec_flags |= RTSA_DEFAULT_METRIC; |
| } |
| |
| msg(D_ROUTE, "GDG6: remote_host_ipv6=%s", |
| remote_host_ipv6 ? print_in6_addr(*remote_host_ipv6, 0, &gc) : "n/a" ); |
| |
| get_default_gateway_ipv6(&rl6->rgi6, remote_host_ipv6, ctx); |
| if (rl6->rgi6.flags & RGI_ADDR_DEFINED) |
| { |
| setenv_str(es, "net_gateway_ipv6", print_in6_addr(rl6->rgi6.gateway.addr_ipv6, 0, &gc)); |
| #if defined(ENABLE_DEBUG) && !defined(ENABLE_SMALL) |
| print_default_gateway(D_ROUTE, NULL, &rl6->rgi6); |
| #endif |
| } |
| else |
| { |
| dmsg(D_ROUTE, "ROUTE6: default_gateway=UNDEF"); |
| } |
| |
| if (is_route_parm_defined( remote_endpoint )) |
| { |
| if (inet_pton( AF_INET6, remote_endpoint, |
| &rl6->remote_endpoint_ipv6) == 1) |
| { |
| rl6->spec_flags |= RTSA_REMOTE_ENDPOINT; |
| } |
| else |
| { |
| msg(M_WARN, PACKAGE_NAME " ROUTE: failed to parse/resolve VPN endpoint: %s", remote_endpoint); |
| ret = false; |
| } |
| } |
| |
| /* parse the routes from opt6 to rl6 |
| * discovering potential overlaps with remote_host_ipv6 in the process |
| */ |
| need_remote_ipv6_route = false; |
| |
| { |
| struct route_ipv6_option *ro6; |
| for (ro6 = opt6->routes_ipv6; ro6; ro6 = ro6->next) |
| { |
| struct route_ipv6 *r6; |
| ALLOC_OBJ_GC(r6, struct route_ipv6, &rl6->gc); |
| if (!init_route_ipv6(r6, ro6, rl6)) |
| { |
| ret = false; |
| } |
| else |
| { |
| r6->next = rl6->routes_ipv6; |
| rl6->routes_ipv6 = r6; |
| |
| #ifndef TARGET_ANDROID |
| /* On Android the VPNService protect function call will take of |
| * avoiding routing loops, so ignore this part and let |
| * need_remote_ipv6_route always evaluate to false |
| */ |
| if (remote_host_ipv6 |
| && route_ipv6_match_host( r6, remote_host_ipv6 ) ) |
| { |
| need_remote_ipv6_route = true; |
| msg(D_ROUTE, "ROUTE6: %s/%d overlaps IPv6 remote %s, adding host route to VPN endpoint", |
| print_in6_addr(r6->network, 0, &gc), r6->netbits, |
| print_in6_addr(*remote_host_ipv6, 0, &gc)); |
| } |
| #endif |
| } |
| } |
| } |
| |
| /* add VPN server host route if needed */ |
| if (need_remote_ipv6_route) |
| { |
| if ( (rl6->rgi6.flags & (RGI_ADDR_DEFINED|RGI_IFACE_DEFINED) ) == |
| (RGI_ADDR_DEFINED|RGI_IFACE_DEFINED) ) |
| { |
| struct route_ipv6 *r6; |
| ALLOC_OBJ_CLEAR_GC(r6, struct route_ipv6, &rl6->gc); |
| |
| r6->network = *remote_host_ipv6; |
| r6->netbits = 128; |
| if (!(rl6->rgi6.flags & RGI_ON_LINK) ) |
| { |
| r6->gateway = rl6->rgi6.gateway.addr_ipv6; |
| } |
| r6->metric = 1; |
| #ifdef _WIN32 |
| r6->adapter_index = rl6->rgi6.adapter_index; |
| #else |
| r6->iface = rl6->rgi6.iface; |
| #endif |
| r6->flags = RT_DEFINED | RT_METRIC_DEFINED; |
| |
| r6->next = rl6->routes_ipv6; |
| rl6->routes_ipv6 = r6; |
| } |
| else |
| { |
| msg(M_WARN, "ROUTE6: IPv6 route overlaps with IPv6 remote address, but could not determine IPv6 gateway address + interface, expect failure\n" ); |
| } |
| } |
| |
| gc_free(&gc); |
| return ret; |
| } |
| |
| static void |
| add_route3(in_addr_t network, |
| in_addr_t netmask, |
| in_addr_t gateway, |
| const struct tuntap *tt, |
| unsigned int flags, |
| const struct route_gateway_info *rgi, |
| const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| struct route_ipv4 r; |
| CLEAR(r); |
| r.flags = RT_DEFINED; |
| r.network = network; |
| r.netmask = netmask; |
| r.gateway = gateway; |
| add_route(&r, tt, flags, rgi, es, ctx); |
| } |
| |
| static void |
| del_route3(in_addr_t network, |
| in_addr_t netmask, |
| in_addr_t gateway, |
| const struct tuntap *tt, |
| unsigned int flags, |
| const struct route_gateway_info *rgi, |
| const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| struct route_ipv4 r; |
| CLEAR(r); |
| r.flags = RT_DEFINED|RT_ADDED; |
| r.network = network; |
| r.netmask = netmask; |
| r.gateway = gateway; |
| delete_route(&r, tt, flags, rgi, es, ctx); |
| } |
| |
| static void |
| add_bypass_routes(struct route_bypass *rb, |
| in_addr_t gateway, |
| const struct tuntap *tt, |
| unsigned int flags, |
| const struct route_gateway_info *rgi, |
| const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| int i; |
| for (i = 0; i < rb->n_bypass; ++i) |
| { |
| if (rb->bypass[i]) |
| { |
| add_route3(rb->bypass[i], |
| IPV4_NETMASK_HOST, |
| gateway, |
| tt, |
| flags | ROUTE_REF_GW, |
| rgi, |
| es, |
| ctx); |
| } |
| } |
| } |
| |
| static void |
| del_bypass_routes(struct route_bypass *rb, |
| in_addr_t gateway, |
| const struct tuntap *tt, |
| unsigned int flags, |
| const struct route_gateway_info *rgi, |
| const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| int i; |
| for (i = 0; i < rb->n_bypass; ++i) |
| { |
| if (rb->bypass[i]) |
| { |
| del_route3(rb->bypass[i], |
| IPV4_NETMASK_HOST, |
| gateway, |
| tt, |
| flags | ROUTE_REF_GW, |
| rgi, |
| es, |
| ctx); |
| } |
| } |
| } |
| |
| static void |
| redirect_default_route_to_vpn(struct route_list *rl, const struct tuntap *tt, |
| unsigned int flags, const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| const char err[] = "NOTE: unable to redirect IPv4 default gateway --"; |
| |
| if (rl && rl->flags & RG_ENABLE) |
| { |
| bool local = rl->flags & RG_LOCAL; |
| |
| if (!(rl->spec.flags & RTSA_REMOTE_ENDPOINT) && (rl->flags & RG_REROUTE_GW)) |
| { |
| msg(M_WARN, "%s VPN gateway parameter (--route-gateway or --ifconfig) is missing", err); |
| } |
| /* |
| * check if a default route is defined, unless: |
| * - we are connecting to a remote host in our network |
| * - we are connecting to a non-IPv4 remote host (i.e. we use IPv6) |
| */ |
| else if (!(rl->rgi.flags & RGI_ADDR_DEFINED) && !local |
| && (rl->spec.flags & RTSA_REMOTE_HOST)) |
| { |
| msg(M_WARN, "%s Cannot read current default gateway from system", err); |
| } |
| else |
| { |
| #ifndef TARGET_ANDROID |
| if (rl->flags & RG_AUTO_LOCAL) |
| { |
| const int tla = rl->spec.remote_host_local; |
| if (tla == TLA_NONLOCAL) |
| { |
| dmsg(D_ROUTE, "ROUTE remote_host is NOT LOCAL"); |
| local = false; |
| } |
| else if (tla == TLA_LOCAL) |
| { |
| dmsg(D_ROUTE, "ROUTE remote_host is LOCAL"); |
| local = true; |
| } |
| } |
| if (!local) |
| { |
| /* route remote host to original default gateway */ |
| /* if remote_host is not ipv4 (ie: ipv6), just skip |
| * adding this special /32 route */ |
| if ((rl->spec.flags & RTSA_REMOTE_HOST) |
| && rl->spec.remote_host != IPV4_INVALID_ADDR) |
| { |
| add_route3(rl->spec.remote_host, |
| IPV4_NETMASK_HOST, |
| rl->rgi.gateway.addr, |
| tt, |
| flags | ROUTE_REF_GW, |
| &rl->rgi, |
| es, |
| ctx); |
| rl->iflags |= RL_DID_LOCAL; |
| } |
| else |
| { |
| dmsg(D_ROUTE, "ROUTE remote_host protocol differs from tunneled"); |
| } |
| } |
| #endif /* ifndef TARGET_ANDROID */ |
| |
| /* route DHCP/DNS server traffic through original default gateway */ |
| add_bypass_routes(&rl->spec.bypass, rl->rgi.gateway.addr, tt, flags, |
| &rl->rgi, es, ctx); |
| |
| if (rl->flags & RG_REROUTE_GW) |
| { |
| if (rl->flags & RG_DEF1) |
| { |
| /* add new default route (1st component) */ |
| add_route3(0x00000000, |
| 0x80000000, |
| rl->spec.remote_endpoint, |
| tt, |
| flags, |
| &rl->rgi, |
| es, |
| ctx); |
| |
| /* add new default route (2nd component) */ |
| add_route3(0x80000000, |
| 0x80000000, |
| rl->spec.remote_endpoint, |
| tt, |
| flags, |
| &rl->rgi, |
| es, |
| ctx); |
| } |
| else |
| { |
| /* don't try to remove the def route if it does not exist */ |
| if (rl->rgi.flags & RGI_ADDR_DEFINED) |
| { |
| /* delete default route */ |
| del_route3(0, 0, rl->rgi.gateway.addr, tt, |
| flags | ROUTE_REF_GW, &rl->rgi, es, ctx); |
| } |
| |
| /* add new default route */ |
| add_route3(0, |
| 0, |
| rl->spec.remote_endpoint, |
| tt, |
| flags, |
| &rl->rgi, |
| es, |
| ctx); |
| } |
| } |
| |
| /* set a flag so we can undo later */ |
| rl->iflags |= RL_DID_REDIRECT_DEFAULT_GATEWAY; |
| } |
| } |
| } |
| |
| static void |
| undo_redirect_default_route_to_vpn(struct route_list *rl, |
| const struct tuntap *tt, unsigned int flags, |
| const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| if (rl && rl->iflags & RL_DID_REDIRECT_DEFAULT_GATEWAY) |
| { |
| /* delete remote host route */ |
| if (rl->iflags & RL_DID_LOCAL) |
| { |
| del_route3(rl->spec.remote_host, |
| IPV4_NETMASK_HOST, |
| rl->rgi.gateway.addr, |
| tt, |
| flags | ROUTE_REF_GW, |
| &rl->rgi, |
| es, |
| ctx); |
| rl->iflags &= ~RL_DID_LOCAL; |
| } |
| |
| /* delete special DHCP/DNS bypass route */ |
| del_bypass_routes(&rl->spec.bypass, rl->rgi.gateway.addr, tt, flags, |
| &rl->rgi, es, ctx); |
| |
| if (rl->flags & RG_REROUTE_GW) |
| { |
| if (rl->flags & RG_DEF1) |
| { |
| /* delete default route (1st component) */ |
| del_route3(0x00000000, |
| 0x80000000, |
| rl->spec.remote_endpoint, |
| tt, |
| flags, |
| &rl->rgi, |
| es, |
| ctx); |
| |
| /* delete default route (2nd component) */ |
| del_route3(0x80000000, |
| 0x80000000, |
| rl->spec.remote_endpoint, |
| tt, |
| flags, |
| &rl->rgi, |
| es, |
| ctx); |
| } |
| else |
| { |
| /* delete default route */ |
| del_route3(0, |
| 0, |
| rl->spec.remote_endpoint, |
| tt, |
| flags, |
| &rl->rgi, |
| es, |
| ctx); |
| /* restore original default route if there was any */ |
| if (rl->rgi.flags & RGI_ADDR_DEFINED) |
| { |
| add_route3(0, 0, rl->rgi.gateway.addr, tt, |
| flags | ROUTE_REF_GW, &rl->rgi, es, ctx); |
| } |
| } |
| } |
| |
| rl->iflags &= ~RL_DID_REDIRECT_DEFAULT_GATEWAY; |
| } |
| } |
| |
| void |
| add_routes(struct route_list *rl, struct route_ipv6_list *rl6, |
| const struct tuntap *tt, unsigned int flags, |
| const struct env_set *es, openvpn_net_ctx_t *ctx) |
| { |
| redirect_default_route_to_vpn(rl, tt, flags, es, ctx); |
| if (rl && !(rl->iflags & RL_ROUTES_ADDED) ) |
| { |
| struct route_ipv4 *r; |
| |
| if (rl->routes && !tt->did_ifconfig_setup) |
| { |
| msg(M_INFO, "WARNING: OpenVPN was configured to add an IPv4 " |
| "route. However, no IPv4 has been configured for %s, " |
| "therefore the route installation may fail or may not work " |
| "as expected.", tt->actual_name); |
| } |
| |
| #ifdef ENABLE_MANAGEMENT |
| if (management && rl->routes) |
| { |
| management_set_state(management, |
| OPENVPN_STATE_ADD_ROUTES, |
| NULL, |
| NULL, |
| NULL, |
| NULL, |
| NULL); |
| } |
| #endif |
| |
| for (r = rl->routes; r; r = r->next) |
| { |
| check_subnet_conflict(r->network, r->netmask, "route"); |
| if (flags & ROUTE_DELETE_FIRST) |
| { |
| delete_route(r, tt, flags, &rl->rgi, es, ctx); |
| } |
| add_route(r, tt, flags, &rl->rgi, es, ctx); |
| } |
| rl->iflags |= RL_ROUTES_ADDED; |
| } |
| if (rl6 && !(rl6->iflags & RL_ROUTES_ADDED) ) |
| { |
| struct route_ipv6 *r; |
| |
| if (!tt->did_ifconfig_ipv6_setup) |
| { |
| msg(M_INFO, "WARNING: OpenVPN was configured to add an IPv6 " |
| "route. However, no IPv6 has been configured for %s, " |
| "therefore the route installation may fail or may not work " |
| "as expected.", tt->actual_name); |
| } |
| |
| for (r = rl6->routes_ipv6; r; r = r->next) |
| { |
| if (flags & ROUTE_DELETE_FIRST) |
| { |
| delete_route_ipv6(r, tt, flags, es, ctx); |
| } |
| add_route_ipv6(r, tt, flags, es, ctx); |
| } |
| rl6->iflags |= RL_ROUTES_ADDED; |
| } |
| } |
| |
| void |
| delete_routes(struct route_list *rl, struct route_ipv6_list *rl6, |
| const struct tuntap *tt, unsigned int flags, |
| const struct env_set *es, openvpn_net_ctx_t *ctx) |
| { |
| if (rl && rl->iflags & RL_ROUTES_ADDED) |
| { |
| struct route_ipv4 *r; |
| for (r = rl->routes; r; r = r->next) |
| { |
| delete_route(r, tt, flags, &rl->rgi, es, ctx); |
| } |
| rl->iflags &= ~RL_ROUTES_ADDED; |
| } |
| |
| undo_redirect_default_route_to_vpn(rl, tt, flags, es, ctx); |
| |
| if (rl) |
| { |
| clear_route_list(rl); |
| } |
| |
| if (rl6 && (rl6->iflags & RL_ROUTES_ADDED) ) |
| { |
| struct route_ipv6 *r6; |
| for (r6 = rl6->routes_ipv6; r6; r6 = r6->next) |
| { |
| delete_route_ipv6(r6, tt, flags, es, ctx); |
| } |
| rl6->iflags &= ~RL_ROUTES_ADDED; |
| } |
| |
| if (rl6) |
| { |
| clear_route_ipv6_list(rl6); |
| } |
| } |
| |
| #ifndef ENABLE_SMALL |
| |
| static const char * |
| show_opt(const char *option) |
| { |
| if (!option) |
| { |
| return "default (not set)"; |
| } |
| else |
| { |
| return option; |
| } |
| } |
| |
| static void |
| print_route_option(const struct route_option *ro, int level) |
| { |
| msg(level, " route %s/%s/%s/%s", |
| show_opt(ro->network), |
| show_opt(ro->netmask), |
| show_opt(ro->gateway), |
| show_opt(ro->metric)); |
| } |
| |
| void |
| print_route_options(const struct route_option_list *rol, |
| int level) |
| { |
| struct route_option *ro; |
| if (rol->flags & RG_ENABLE) |
| { |
| msg(level, " [redirect_default_gateway local=%d]", |
| (rol->flags & RG_LOCAL) != 0); |
| } |
| for (ro = rol->routes; ro; ro = ro->next) |
| { |
| print_route_option(ro, level); |
| } |
| } |
| |
| void |
| print_default_gateway(const int msglevel, |
| const struct route_gateway_info *rgi, |
| const struct route_ipv6_gateway_info *rgi6) |
| { |
| struct gc_arena gc = gc_new(); |
| if (rgi && (rgi->flags & RGI_ADDR_DEFINED)) |
| { |
| struct buffer out = alloc_buf_gc(256, &gc); |
| buf_printf(&out, "ROUTE_GATEWAY"); |
| if (rgi->flags & RGI_ON_LINK) |
| { |
| buf_printf(&out, " ON_LINK"); |
| } |
| else |
| { |
| buf_printf(&out, " %s", print_in_addr_t(rgi->gateway.addr, 0, &gc)); |
| } |
| if (rgi->flags & RGI_NETMASK_DEFINED) |
| { |
| buf_printf(&out, "/%s", print_in_addr_t(rgi->gateway.netmask, 0, &gc)); |
| } |
| #ifdef _WIN32 |
| if (rgi->flags & RGI_IFACE_DEFINED) |
| { |
| buf_printf(&out, " I=%lu", rgi->adapter_index); |
| } |
| #else |
| if (rgi->flags & RGI_IFACE_DEFINED) |
| { |
| buf_printf(&out, " IFACE=%s", rgi->iface); |
| } |
| #endif |
| if (rgi->flags & RGI_HWADDR_DEFINED) |
| { |
| buf_printf(&out, " HWADDR=%s", format_hex_ex(rgi->hwaddr, 6, 0, 1, ":", &gc)); |
| } |
| msg(msglevel, "%s", BSTR(&out)); |
| } |
| |
| if (rgi6 && (rgi6->flags & RGI_ADDR_DEFINED)) |
| { |
| struct buffer out = alloc_buf_gc(256, &gc); |
| buf_printf(&out, "ROUTE6_GATEWAY"); |
| buf_printf(&out, " %s", print_in6_addr(rgi6->gateway.addr_ipv6, 0, &gc)); |
| if (rgi6->flags & RGI_ON_LINK) |
| { |
| buf_printf(&out, " ON_LINK"); |
| } |
| if (rgi6->flags & RGI_NETMASK_DEFINED) |
| { |
| buf_printf(&out, "/%d", rgi6->gateway.netbits_ipv6); |
| } |
| #ifdef _WIN32 |
| if (rgi6->flags & RGI_IFACE_DEFINED) |
| { |
| buf_printf(&out, " I=%lu", rgi6->adapter_index); |
| } |
| #else |
| if (rgi6->flags & RGI_IFACE_DEFINED) |
| { |
| buf_printf(&out, " IFACE=%s", rgi6->iface); |
| } |
| #endif |
| if (rgi6->flags & RGI_HWADDR_DEFINED) |
| { |
| buf_printf(&out, " HWADDR=%s", format_hex_ex(rgi6->hwaddr, 6, 0, 1, ":", &gc)); |
| } |
| msg(msglevel, "%s", BSTR(&out)); |
| } |
| gc_free(&gc); |
| } |
| |
| #endif /* ifndef ENABLE_SMALL */ |
| |
| static void |
| print_route(const struct route_ipv4 *r, int level) |
| { |
| struct gc_arena gc = gc_new(); |
| if (r->flags & RT_DEFINED) |
| { |
| msg(level, "%s", route_string(r, &gc)); |
| } |
| gc_free(&gc); |
| } |
| |
| void |
| print_routes(const struct route_list *rl, int level) |
| { |
| struct route_ipv4 *r; |
| for (r = rl->routes; r; r = r->next) |
| { |
| print_route(r, level); |
| } |
| } |
| |
| static void |
| setenv_route(struct env_set *es, const struct route_ipv4 *r, int i) |
| { |
| struct gc_arena gc = gc_new(); |
| if (r->flags & RT_DEFINED) |
| { |
| setenv_route_addr(es, "network", r->network, i); |
| setenv_route_addr(es, "netmask", r->netmask, i); |
| setenv_route_addr(es, "gateway", r->gateway, i); |
| |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| struct buffer name = alloc_buf_gc(256, &gc); |
| buf_printf(&name, "route_metric_%d", i); |
| setenv_int(es, BSTR(&name), r->metric); |
| } |
| } |
| gc_free(&gc); |
| } |
| |
| void |
| setenv_routes(struct env_set *es, const struct route_list *rl) |
| { |
| int i = 1; |
| struct route_ipv4 *r; |
| for (r = rl->routes; r; r = r->next) |
| { |
| setenv_route(es, r, i++); |
| } |
| } |
| |
| static void |
| setenv_route_ipv6(struct env_set *es, const struct route_ipv6 *r6, int i) |
| { |
| struct gc_arena gc = gc_new(); |
| if (r6->flags & RT_DEFINED) |
| { |
| struct buffer name1 = alloc_buf_gc( 256, &gc ); |
| struct buffer val = alloc_buf_gc( 256, &gc ); |
| struct buffer name2 = alloc_buf_gc( 256, &gc ); |
| |
| buf_printf( &name1, "route_ipv6_network_%d", i ); |
| buf_printf( &val, "%s/%d", print_in6_addr( r6->network, 0, &gc ), |
| r6->netbits ); |
| setenv_str( es, BSTR(&name1), BSTR(&val) ); |
| |
| buf_printf( &name2, "route_ipv6_gateway_%d", i ); |
| setenv_str( es, BSTR(&name2), print_in6_addr( r6->gateway, 0, &gc )); |
| |
| if (r6->flags & RT_METRIC_DEFINED) |
| { |
| struct buffer name3 = alloc_buf_gc( 256, &gc ); |
| buf_printf( &name3, "route_ipv6_metric_%d", i) ; |
| setenv_int( es, BSTR(&name3), r6->metric); |
| } |
| } |
| gc_free(&gc); |
| } |
| void |
| setenv_routes_ipv6(struct env_set *es, const struct route_ipv6_list *rl6) |
| { |
| int i = 1; |
| struct route_ipv6 *r6; |
| for (r6 = rl6->routes_ipv6; r6; r6 = r6->next) |
| { |
| setenv_route_ipv6(es, r6, i++); |
| } |
| } |
| |
| /* |
| * local_route() determines whether the gateway of a provided host |
| * route is on the same interface that owns the default gateway. |
| * It uses the data structure |
| * returned by get_default_gateway() (struct route_gateway_info) |
| * to determine this. If the route is local, LR_MATCH is returned. |
| * When adding routes into the kernel, if LR_MATCH is defined for |
| * a given route, the route should explicitly reference the default |
| * gateway interface as the route destination. For example, here |
| * is an example on Linux that uses LR_MATCH: |
| * |
| * route add -net 10.10.0.1 netmask 255.255.255.255 dev eth0 |
| * |
| * This capability is needed by the "default-gateway block-local" |
| * directive, to allow client access to the local subnet to be |
| * blocked but still allow access to the local default gateway. |
| */ |
| |
| /* local_route() return values */ |
| #define LR_NOMATCH 0 /* route is not local */ |
| #define LR_MATCH 1 /* route is local */ |
| #define LR_ERROR 2 /* caller should abort adding route */ |
| |
| static int |
| local_route(in_addr_t network, |
| in_addr_t netmask, |
| in_addr_t gateway, |
| const struct route_gateway_info *rgi) |
| { |
| /* set LR_MATCH on local host routes */ |
| const int rgi_needed = (RGI_ADDR_DEFINED|RGI_NETMASK_DEFINED|RGI_IFACE_DEFINED); |
| if (rgi |
| && (rgi->flags & rgi_needed) == rgi_needed |
| && gateway == rgi->gateway.addr |
| && netmask == 0xFFFFFFFF) |
| { |
| if (((network ^ rgi->gateway.addr) & rgi->gateway.netmask) == 0) |
| { |
| return LR_MATCH; |
| } |
| else |
| { |
| /* examine additional subnets on gateway interface */ |
| size_t i; |
| for (i = 0; i < rgi->n_addrs; ++i) |
| { |
| const struct route_gateway_address *gwa = &rgi->addrs[i]; |
| if (((network ^ gwa->addr) & gwa->netmask) == 0) |
| { |
| return LR_MATCH; |
| } |
| } |
| } |
| } |
| return LR_NOMATCH; |
| } |
| |
| /* Return true if the "on-link" form of the route should be used. This is when the gateway for a |
| * a route is specified as an interface rather than an address. */ |
| static inline bool |
| is_on_link(const int is_local_route, const unsigned int flags, const struct route_gateway_info *rgi) |
| { |
| return rgi && (is_local_route == LR_MATCH || ((flags & ROUTE_REF_GW) && (rgi->flags & RGI_ON_LINK))); |
| } |
| |
| void |
| add_route(struct route_ipv4 *r, |
| const struct tuntap *tt, |
| unsigned int flags, |
| const struct route_gateway_info *rgi, /* may be NULL */ |
| const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc; |
| struct argv argv = argv_new(); |
| #if !defined(TARGET_LINUX) |
| const char *network; |
| #if !defined(TARGET_AIX) |
| const char *netmask; |
| #endif |
| const char *gateway; |
| #endif |
| bool status = false; |
| int is_local_route; |
| |
| if (!(r->flags & RT_DEFINED)) |
| { |
| return; |
| } |
| |
| gc_init(&gc); |
| |
| #if !defined(TARGET_LINUX) |
| network = print_in_addr_t(r->network, 0, &gc); |
| #if !defined(TARGET_AIX) |
| netmask = print_in_addr_t(r->netmask, 0, &gc); |
| #endif |
| gateway = print_in_addr_t(r->gateway, 0, &gc); |
| #endif |
| |
| is_local_route = local_route(r->network, r->netmask, r->gateway, rgi); |
| if (is_local_route == LR_ERROR) |
| { |
| goto done; |
| } |
| |
| #if defined(TARGET_LINUX) |
| const char *iface = NULL; |
| int metric = -1; |
| |
| if (is_on_link(is_local_route, flags, rgi)) |
| { |
| iface = rgi->iface; |
| } |
| |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| metric = r->metric; |
| } |
| |
| status = true; |
| if (net_route_v4_add(ctx, &r->network, netmask_to_netbits2(r->netmask), |
| &r->gateway, iface, 0, metric) < 0) |
| { |
| msg(M_WARN, "ERROR: Linux route add command failed"); |
| status = false; |
| } |
| |
| #elif defined (TARGET_ANDROID) |
| char out[128]; |
| |
| if (rgi) |
| { |
| openvpn_snprintf(out, sizeof(out), "%s %s %s dev %s", network, netmask, gateway, rgi->iface); |
| } |
| else |
| { |
| openvpn_snprintf(out, sizeof(out), "%s %s %s", network, netmask, gateway); |
| } |
| management_android_control(management, "ROUTE", out); |
| |
| #elif defined (_WIN32) |
| { |
| DWORD ai = TUN_ADAPTER_INDEX_INVALID; |
| argv_printf(&argv, "%s%s ADD %s MASK %s %s", |
| get_win_sys_path(), |
| WIN_ROUTE_PATH_SUFFIX, |
| network, |
| netmask, |
| gateway); |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| argv_printf_cat(&argv, "METRIC %d", r->metric); |
| } |
| if (is_on_link(is_local_route, flags, rgi)) |
| { |
| ai = rgi->adapter_index; |
| argv_printf_cat(&argv, "IF %lu", ai); |
| } |
| |
| argv_msg(D_ROUTE, &argv); |
| |
| if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_SERVICE) |
| { |
| status = add_route_service(r, tt); |
| msg(D_ROUTE, "Route addition via service %s", status ? "succeeded" : "failed"); |
| } |
| else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI) |
| { |
| status = add_route_ipapi(r, tt, ai); |
| msg(D_ROUTE, "Route addition via IPAPI %s", status ? "succeeded" : "failed"); |
| } |
| else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE) |
| { |
| netcmd_semaphore_lock(); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: Windows route add command failed"); |
| netcmd_semaphore_release(); |
| } |
| else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE) |
| { |
| status = add_route_ipapi(r, tt, ai); |
| msg(D_ROUTE, "Route addition via IPAPI %s [adaptive]", status ? "succeeded" : "failed"); |
| if (!status) |
| { |
| msg(D_ROUTE, "Route addition fallback to route.exe"); |
| netcmd_semaphore_lock(); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: Windows route add command failed [adaptive]"); |
| netcmd_semaphore_release(); |
| } |
| } |
| else |
| { |
| ASSERT(0); |
| } |
| } |
| |
| #elif defined (TARGET_SOLARIS) |
| |
| /* example: route add 192.0.2.32 -netmask 255.255.255.224 somegateway */ |
| |
| argv_printf(&argv, "%s add", |
| ROUTE_PATH); |
| |
| argv_printf_cat(&argv, "%s -netmask %s %s", |
| network, |
| netmask, |
| gateway); |
| |
| /* Solaris can only distinguish between "metric 0" == "on-link on the |
| * interface where the IP address given is configured" and "metric > 0" |
| * == "use gateway specified" (no finer-grained route metrics available) |
| * |
| * More recent versions of Solaris can also do "-interface", but that |
| * would break backwards compatibility with older versions for no gain. |
| */ |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| argv_printf_cat(&argv, "%d", r->metric); |
| } |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route add command failed"); |
| |
| #elif defined(TARGET_FREEBSD) |
| |
| argv_printf(&argv, "%s add", |
| ROUTE_PATH); |
| |
| #if 0 |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| argv_printf_cat(&argv, "-rtt %d", r->metric); |
| } |
| #endif |
| |
| argv_printf_cat(&argv, "-net %s %s %s", |
| network, |
| gateway, |
| netmask); |
| |
| /* FIXME -- add on-link support for FreeBSD */ |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: FreeBSD route add command failed"); |
| |
| #elif defined(TARGET_DRAGONFLY) |
| |
| argv_printf(&argv, "%s add", |
| ROUTE_PATH); |
| |
| #if 0 |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| argv_printf_cat(&argv, "-rtt %d", r->metric); |
| } |
| #endif |
| |
| argv_printf_cat(&argv, "-net %s %s %s", |
| network, |
| gateway, |
| netmask); |
| |
| /* FIXME -- add on-link support for Dragonfly */ |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: DragonFly route add command failed"); |
| |
| #elif defined(TARGET_DARWIN) |
| |
| argv_printf(&argv, "%s add", |
| ROUTE_PATH); |
| |
| #if 0 |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| argv_printf_cat(&argv, "-rtt %d", r->metric); |
| } |
| #endif |
| |
| if (is_on_link(is_local_route, flags, rgi)) |
| { |
| /* Mac OS X route syntax for ON_LINK: |
| * route add -cloning -net 10.10.0.1 -netmask 255.255.255.255 -interface en0 */ |
| argv_printf_cat(&argv, "-cloning -net %s -netmask %s -interface %s", |
| network, |
| netmask, |
| rgi->iface); |
| } |
| else |
| { |
| argv_printf_cat(&argv, "-net %s %s %s", |
| network, |
| gateway, |
| netmask); |
| } |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: OS X route add command failed"); |
| |
| #elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) |
| |
| argv_printf(&argv, "%s add", |
| ROUTE_PATH); |
| |
| #if 0 |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| argv_printf_cat(&argv, "-rtt %d", r->metric); |
| } |
| #endif |
| |
| argv_printf_cat(&argv, "-net %s %s -netmask %s", |
| network, |
| gateway, |
| netmask); |
| |
| /* FIXME -- add on-link support for OpenBSD/NetBSD */ |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD/NetBSD route add command failed"); |
| |
| #elif defined(TARGET_AIX) |
| |
| { |
| int netbits = netmask_to_netbits2(r->netmask); |
| argv_printf(&argv, "%s add -net %s/%d %s", |
| ROUTE_PATH, |
| network, netbits, gateway); |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: AIX route add command failed"); |
| } |
| |
| #else /* if defined(TARGET_LINUX) */ |
| msg(M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system. Try putting your routes in a --route-up script"); |
| #endif /* if defined(TARGET_LINUX) */ |
| |
| done: |
| if (status) |
| { |
| r->flags |= RT_ADDED; |
| } |
| else |
| { |
| r->flags &= ~RT_ADDED; |
| } |
| argv_free(&argv); |
| gc_free(&gc); |
| /* release resources potentially allocated during route setup */ |
| net_ctx_reset(ctx); |
| } |
| |
| |
| void |
| route_ipv6_clear_host_bits( struct route_ipv6 *r6 ) |
| { |
| /* clear host bit parts of route |
| * (needed if routes are specified improperly, or if we need to |
| * explicitly setup/clear the "connected" network routes on some OSes) |
| */ |
| int byte = 15; |
| int bits_to_clear = 128 - r6->netbits; |
| |
| while (byte >= 0 && bits_to_clear > 0) |
| { |
| if (bits_to_clear >= 8) |
| { |
| r6->network.s6_addr[byte--] = 0; bits_to_clear -= 8; |
| } |
| else |
| { |
| r6->network.s6_addr[byte--] &= (0xff << bits_to_clear); bits_to_clear = 0; |
| } |
| } |
| } |
| |
| void |
| add_route_ipv6(struct route_ipv6 *r6, const struct tuntap *tt, |
| unsigned int flags, const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc; |
| struct argv argv = argv_new(); |
| |
| const char *network; |
| const char *gateway; |
| bool status = false; |
| const char *device = tt->actual_name; |
| #if defined(TARGET_LINUX) |
| int metric; |
| #endif |
| bool gateway_needed = false; |
| |
| if (!(r6->flags & RT_DEFINED) ) |
| { |
| return; |
| } |
| |
| #ifndef _WIN32 |
| if (r6->iface != NULL) /* vpn server special route */ |
| { |
| device = r6->iface; |
| if (!IN6_IS_ADDR_UNSPECIFIED(&r6->gateway) ) |
| { |
| gateway_needed = true; |
| } |
| } |
| #endif |
| |
| gc_init(&gc); |
| |
| route_ipv6_clear_host_bits(r6); |
| |
| network = print_in6_addr( r6->network, 0, &gc); |
| gateway = print_in6_addr( r6->gateway, 0, &gc); |
| |
| #if defined(TARGET_DARWIN) \ |
| || defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \ |
| || defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) |
| |
| /* the BSD platforms cannot specify gateway and interface independently, |
| * but for link-local destinations, we MUST specify the interface, so |
| * we build a combined "$gateway%$interface" gateway string |
| */ |
| if (r6->iface != NULL && gateway_needed |
| && IN6_IS_ADDR_LINKLOCAL(&r6->gateway) ) /* fe80::...%intf */ |
| { |
| int len = strlen(gateway) + 1 + strlen(r6->iface)+1; |
| char *tmp = gc_malloc( len, true, &gc ); |
| snprintf( tmp, len, "%s%%%s", gateway, r6->iface ); |
| gateway = tmp; |
| } |
| #endif |
| |
| msg( M_INFO, "add_route_ipv6(%s/%d -> %s metric %d) dev %s", |
| network, r6->netbits, gateway, r6->metric, device ); |
| |
| /* |
| * Filter out routes which are essentially no-ops |
| * (not currently done for IPv6) |
| */ |
| |
| /* On "tun" interface, we never set a gateway if the operating system |
| * can do "route to interface" - it does not add value, as the target |
| * dev already fully qualifies the route destination on point-to-point |
| * interfaces. OTOH, on "tap" interface, we must always set the |
| * gateway unless the route is to be an on-link network |
| */ |
| if (tt->type == DEV_TYPE_TAP |
| && !( (r6->flags & RT_METRIC_DEFINED) && r6->metric == 0 ) ) |
| { |
| gateway_needed = true; |
| } |
| |
| if (gateway_needed && IN6_IS_ADDR_UNSPECIFIED(&r6->gateway)) |
| { |
| msg(M_WARN, "ROUTE6 WARNING: " PACKAGE_NAME " needs a gateway " |
| "parameter for a --route-ipv6 option and no default was set via " |
| "--ifconfig-ipv6 or --route-ipv6-gateway option. Not installing " |
| "IPv6 route to %s/%d.", network, r6->netbits); |
| status = false; |
| goto done; |
| } |
| |
| #if defined(TARGET_LINUX) |
| metric = -1; |
| if ((r6->flags & RT_METRIC_DEFINED) && (r6->metric > 0)) |
| { |
| metric = r6->metric; |
| } |
| |
| status = true; |
| if (net_route_v6_add(ctx, &r6->network, r6->netbits, |
| gateway_needed ? &r6->gateway : NULL, device, 0, |
| metric) < 0) |
| { |
| msg(M_WARN, "ERROR: Linux IPv6 route can't be added"); |
| status = false; |
| } |
| |
| #elif defined (TARGET_ANDROID) |
| char out[64]; |
| |
| openvpn_snprintf(out, sizeof(out), "%s/%d %s", network, r6->netbits, device); |
| |
| management_android_control(management, "ROUTE6", out); |
| |
| #elif defined (_WIN32) |
| |
| if (tt->options.msg_channel) |
| { |
| status = add_route_ipv6_service(r6, tt); |
| } |
| else |
| { |
| DWORD adapter_index; |
| if (r6->adapter_index) /* vpn server special route */ |
| { |
| adapter_index = r6->adapter_index; |
| gateway_needed = true; |
| } |
| else |
| { |
| adapter_index = tt->adapter_index; |
| } |
| |
| /* netsh interface ipv6 add route 2001:db8::/32 42 */ |
| argv_printf(&argv, "%s%s interface ipv6 add route %s/%d %lu", |
| get_win_sys_path(), |
| NETSH_PATH_SUFFIX, |
| network, |
| r6->netbits, |
| adapter_index); |
| |
| /* next-hop depends on TUN or TAP mode: |
| * - in TAP mode, we use the "real" next-hop |
| * - in TUN mode we use a special-case link-local address that the tapdrvr |
| * knows about and will answer ND (neighbor discovery) packets for |
| */ |
| if (tt->type == DEV_TYPE_TUN && !gateway_needed) |
| { |
| argv_printf_cat( &argv, " %s", "fe80::8" ); |
| } |
| else if (!IN6_IS_ADDR_UNSPECIFIED(&r6->gateway) ) |
| { |
| argv_printf_cat( &argv, " %s", gateway ); |
| } |
| |
| #if 0 |
| if (r6->flags & RT_METRIC_DEFINED) |
| { |
| argv_printf_cat(&argv, " METRIC %d", r->metric); |
| } |
| #endif |
| |
| /* in some versions of Windows, routes are persistent across reboots by |
| * default, unless "store=active" is set (pointed out by Tony Lim, thanks) |
| */ |
| argv_printf_cat( &argv, " store=active" ); |
| |
| argv_msg(D_ROUTE, &argv); |
| |
| netcmd_semaphore_lock(); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: Windows route add ipv6 command failed"); |
| netcmd_semaphore_release(); |
| } |
| |
| #elif defined (TARGET_SOLARIS) |
| |
| /* example: route add -inet6 2001:db8::/32 somegateway 0 */ |
| |
| /* for some reason, routes to tun/tap do not work for me unless I set |
| * "metric 0" - otherwise, the routes will be nicely installed, but |
| * packets will just disappear somewhere. So we always use "0" now, |
| * unless the route points to "gateway on other interface"... |
| * |
| * (Note: OpenSolaris can not specify host%interface gateways, so we just |
| * use the GW addresses - it seems to still work for fe80:: addresses, |
| * however this is done internally. NUD maybe?) |
| */ |
| argv_printf(&argv, "%s add -inet6 %s/%d %s", |
| ROUTE_PATH, |
| network, |
| r6->netbits, |
| gateway ); |
| |
| /* on tun (not tap), not "elsewhere"? -> metric 0 */ |
| if (tt->type == DEV_TYPE_TUN && !r6->iface) |
| { |
| argv_printf_cat(&argv, "0"); |
| } |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route add -inet6 command failed"); |
| |
| #elif defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) |
| |
| argv_printf(&argv, "%s add -inet6 %s/%d", |
| ROUTE_PATH, |
| network, |
| r6->netbits); |
| |
| if (gateway_needed) |
| { |
| argv_printf_cat(&argv, "%s", gateway); |
| } |
| else |
| { |
| argv_printf_cat(&argv, "-iface %s", device); |
| } |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: *BSD route add -inet6 command failed"); |
| |
| #elif defined(TARGET_DARWIN) |
| |
| argv_printf(&argv, "%s add -inet6 %s -prefixlen %d", |
| ROUTE_PATH, |
| network, r6->netbits ); |
| |
| if (gateway_needed) |
| { |
| argv_printf_cat(&argv, "%s", gateway); |
| } |
| else |
| { |
| argv_printf_cat(&argv, "-iface %s", device); |
| } |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: MacOS X route add -inet6 command failed"); |
| |
| #elif defined(TARGET_OPENBSD) |
| |
| argv_printf(&argv, "%s add -inet6 %s -prefixlen %d %s", |
| ROUTE_PATH, |
| network, r6->netbits, gateway ); |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD route add -inet6 command failed"); |
| |
| #elif defined(TARGET_NETBSD) |
| |
| argv_printf(&argv, "%s add -inet6 %s/%d %s", |
| ROUTE_PATH, |
| network, r6->netbits, gateway ); |
| |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: NetBSD route add -inet6 command failed"); |
| |
| #elif defined(TARGET_AIX) |
| |
| argv_printf(&argv, "%s add -inet6 %s/%d %s", |
| ROUTE_PATH, |
| network, r6->netbits, gateway); |
| argv_msg(D_ROUTE, &argv); |
| status = openvpn_execve_check(&argv, es, 0, "ERROR: AIX route add command failed"); |
| |
| #else /* if defined(TARGET_LINUX) */ |
| msg(M_FATAL, "Sorry, but I don't know how to do 'route ipv6' commands on this operating system. Try putting your routes in a --route-up script"); |
| #endif /* if defined(TARGET_LINUX) */ |
| |
| done: |
| if (status) |
| { |
| r6->flags |= RT_ADDED; |
| } |
| else |
| { |
| r6->flags &= ~RT_ADDED; |
| } |
| argv_free(&argv); |
| gc_free(&gc); |
| /* release resources potentially allocated during route setup */ |
| net_ctx_reset(ctx); |
| } |
| |
| static void |
| delete_route(struct route_ipv4 *r, |
| const struct tuntap *tt, |
| unsigned int flags, |
| const struct route_gateway_info *rgi, |
| const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc; |
| struct argv argv = argv_new(); |
| #if !defined(TARGET_LINUX) |
| const char *network; |
| #if !defined(TARGET_AIX) |
| const char *netmask; |
| #endif |
| #if !defined(TARGET_ANDROID) |
| const char *gateway; |
| #endif |
| #else /* if !defined(TARGET_LINUX) */ |
| int metric; |
| #endif |
| int is_local_route; |
| |
| if ((r->flags & (RT_DEFINED|RT_ADDED)) != (RT_DEFINED|RT_ADDED)) |
| { |
| return; |
| } |
| |
| gc_init(&gc); |
| |
| #if !defined(TARGET_LINUX) |
| network = print_in_addr_t(r->network, 0, &gc); |
| #if !defined(TARGET_AIX) |
| netmask = print_in_addr_t(r->netmask, 0, &gc); |
| #endif |
| #if !defined(TARGET_ANDROID) |
| gateway = print_in_addr_t(r->gateway, 0, &gc); |
| #endif |
| #endif |
| |
| is_local_route = local_route(r->network, r->netmask, r->gateway, rgi); |
| if (is_local_route == LR_ERROR) |
| { |
| goto done; |
| } |
| |
| #if defined(TARGET_LINUX) |
| metric = -1; |
| if (r->flags & RT_METRIC_DEFINED) |
| { |
| metric = r->metric; |
| } |
| |
| if (net_route_v4_del(ctx, &r->network, netmask_to_netbits2(r->netmask), |
| &r->gateway, NULL, 0, metric) < 0) |
| { |
| msg(M_WARN, "ERROR: Linux route delete command failed"); |
| } |
| #elif defined (_WIN32) |
| |
| argv_printf(&argv, "%s%s DELETE %s MASK %s %s", |
| get_win_sys_path(), |
| WIN_ROUTE_PATH_SUFFIX, |
| network, |
| netmask, |
| gateway); |
| |
| argv_msg(D_ROUTE, &argv); |
| |
| if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_SERVICE) |
| { |
| const bool status = del_route_service(r, tt); |
| msg(D_ROUTE, "Route deletion via service %s", status ? "succeeded" : "failed"); |
| } |
| else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_IPAPI) |
| { |
| const bool status = del_route_ipapi(r, tt); |
| msg(D_ROUTE, "Route deletion via IPAPI %s", status ? "succeeded" : "failed"); |
| } |
| else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_EXE) |
| { |
| netcmd_semaphore_lock(); |
| openvpn_execve_check(&argv, es, 0, "ERROR: Windows route delete command failed"); |
| netcmd_semaphore_release(); |
| } |
| else if ((flags & ROUTE_METHOD_MASK) == ROUTE_METHOD_ADAPTIVE) |
| { |
| const bool status = del_route_ipapi(r, tt); |
| msg(D_ROUTE, "Route deletion via IPAPI %s [adaptive]", status ? "succeeded" : "failed"); |
| if (!status) |
| { |
| msg(D_ROUTE, "Route deletion fallback to route.exe"); |
| netcmd_semaphore_lock(); |
| openvpn_execve_check(&argv, es, 0, "ERROR: Windows route delete command failed [adaptive]"); |
| netcmd_semaphore_release(); |
| } |
| } |
| else |
| { |
| ASSERT(0); |
| } |
| |
| #elif defined (TARGET_SOLARIS) |
| |
| argv_printf(&argv, "%s delete %s -netmask %s %s", |
| ROUTE_PATH, |
| network, |
| netmask, |
| gateway); |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route delete command failed"); |
| |
| #elif defined(TARGET_FREEBSD) |
| |
| argv_printf(&argv, "%s delete -net %s %s %s", |
| ROUTE_PATH, |
| network, |
| gateway, |
| netmask); |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: FreeBSD route delete command failed"); |
| |
| #elif defined(TARGET_DRAGONFLY) |
| |
| argv_printf(&argv, "%s delete -net %s %s %s", |
| ROUTE_PATH, |
| network, |
| gateway, |
| netmask); |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: DragonFly route delete command failed"); |
| |
| #elif defined(TARGET_DARWIN) |
| |
| if (is_on_link(is_local_route, flags, rgi)) |
| { |
| argv_printf(&argv, "%s delete -cloning -net %s -netmask %s -interface %s", |
| ROUTE_PATH, |
| network, |
| netmask, |
| rgi->iface); |
| } |
| else |
| { |
| argv_printf(&argv, "%s delete -net %s %s %s", |
| ROUTE_PATH, |
| network, |
| gateway, |
| netmask); |
| } |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: OS X route delete command failed"); |
| |
| #elif defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) |
| |
| argv_printf(&argv, "%s delete -net %s %s -netmask %s", |
| ROUTE_PATH, |
| network, |
| gateway, |
| netmask); |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD/NetBSD route delete command failed"); |
| |
| #elif defined(TARGET_ANDROID) |
| msg(M_NONFATAL, "Sorry, deleting routes on Android is not possible. The VpnService API allows routes to be set on connect only."); |
| |
| #elif defined(TARGET_AIX) |
| |
| { |
| int netbits = netmask_to_netbits2(r->netmask); |
| argv_printf(&argv, "%s delete -net %s/%d %s", |
| ROUTE_PATH, |
| network, netbits, gateway); |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: AIX route delete command failed"); |
| } |
| |
| #else /* if defined(TARGET_LINUX) */ |
| msg(M_FATAL, "Sorry, but I don't know how to do 'route' commands on this operating system. Try putting your routes in a --route-up script"); |
| #endif /* if defined(TARGET_LINUX) */ |
| |
| done: |
| r->flags &= ~RT_ADDED; |
| argv_free(&argv); |
| gc_free(&gc); |
| /* release resources potentially allocated during route cleanup */ |
| net_ctx_reset(ctx); |
| } |
| |
| void |
| delete_route_ipv6(const struct route_ipv6 *r6, const struct tuntap *tt, |
| unsigned int flags, const struct env_set *es, |
| openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc; |
| struct argv argv = argv_new(); |
| const char *network; |
| #if !defined(TARGET_LINUX) |
| const char *gateway; |
| #else |
| int metric; |
| #endif |
| const char *device = tt->actual_name; |
| bool gateway_needed = false; |
| |
| if ((r6->flags & (RT_DEFINED|RT_ADDED)) != (RT_DEFINED|RT_ADDED)) |
| { |
| return; |
| } |
| |
| #ifndef _WIN32 |
| if (r6->iface != NULL) /* vpn server special route */ |
| { |
| device = r6->iface; |
| gateway_needed = true; |
| } |
| #endif |
| |
| gc_init(&gc); |
| |
| network = print_in6_addr( r6->network, 0, &gc); |
| #if !defined(TARGET_LINUX) |
| gateway = print_in6_addr( r6->gateway, 0, &gc); |
| #endif |
| |
| #if defined(TARGET_DARWIN) \ |
| || defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \ |
| || defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) |
| |
| /* the BSD platforms cannot specify gateway and interface independently, |
| * but for link-local destinations, we MUST specify the interface, so |
| * we build a combined "$gateway%$interface" gateway string |
| */ |
| if (r6->iface != NULL && gateway_needed |
| && IN6_IS_ADDR_LINKLOCAL(&r6->gateway) ) /* fe80::...%intf */ |
| { |
| int len = strlen(gateway) + 1 + strlen(r6->iface)+1; |
| char *tmp = gc_malloc( len, true, &gc ); |
| snprintf( tmp, len, "%s%%%s", gateway, r6->iface ); |
| gateway = tmp; |
| } |
| #endif |
| |
| msg( M_INFO, "delete_route_ipv6(%s/%d)", network, r6->netbits ); |
| |
| /* if we used a gateway on "add route", we also need to specify it on |
| * delete, otherwise some OSes will refuse to delete the route |
| */ |
| if (tt->type == DEV_TYPE_TAP |
| && !( (r6->flags & RT_METRIC_DEFINED) && r6->metric == 0 ) ) |
| { |
| gateway_needed = true; |
| } |
| |
| #if defined(TARGET_LINUX) |
| metric = -1; |
| if ((r6->flags & RT_METRIC_DEFINED) && (r6->metric > 0)) |
| { |
| metric = r6->metric; |
| } |
| |
| if (net_route_v6_del(ctx, &r6->network, r6->netbits, |
| gateway_needed ? &r6->gateway : NULL, device, 0, |
| metric) < 0) |
| { |
| msg(M_WARN, "ERROR: Linux route v6 delete command failed"); |
| } |
| |
| #elif defined (_WIN32) |
| |
| if (tt->options.msg_channel) |
| { |
| del_route_ipv6_service(r6, tt); |
| } |
| else |
| { |
| DWORD adapter_index; |
| if (r6->adapter_index) /* vpn server special route */ |
| { |
| adapter_index = r6->adapter_index; |
| gateway_needed = true; |
| } |
| else |
| { |
| adapter_index = tt->adapter_index; |
| } |
| |
| /* netsh interface ipv6 delete route 2001:db8::/32 42 */ |
| argv_printf(&argv, "%s%s interface ipv6 delete route %s/%d %lu", |
| get_win_sys_path(), |
| NETSH_PATH_SUFFIX, |
| network, |
| r6->netbits, |
| adapter_index); |
| |
| /* next-hop depends on TUN or TAP mode: |
| * - in TAP mode, we use the "real" next-hop |
| * - in TUN mode we use a special-case link-local address that the tapdrvr |
| * knows about and will answer ND (neighbor discovery) packets for |
| * (and "route deletion without specifying next-hop" does not work...) |
| */ |
| if (tt->type == DEV_TYPE_TUN && !gateway_needed) |
| { |
| argv_printf_cat( &argv, " %s", "fe80::8" ); |
| } |
| else if (!IN6_IS_ADDR_UNSPECIFIED(&r6->gateway) ) |
| { |
| argv_printf_cat( &argv, " %s", gateway ); |
| } |
| |
| #if 0 |
| if (r6->flags & RT_METRIC_DEFINED) |
| { |
| argv_printf_cat(&argv, "METRIC %d", r->metric); |
| } |
| #endif |
| |
| /* Windows XP to 7 "just delete" routes, wherever they came from, but |
| * in Windows 8(.1?), if you create them with "store=active", this is |
| * how you should delete them as well (pointed out by Cedric Tabary) |
| */ |
| argv_printf_cat( &argv, " store=active" ); |
| |
| argv_msg(D_ROUTE, &argv); |
| |
| netcmd_semaphore_lock(); |
| openvpn_execve_check(&argv, es, 0, "ERROR: Windows route delete ipv6 command failed"); |
| netcmd_semaphore_release(); |
| } |
| |
| #elif defined (TARGET_SOLARIS) |
| |
| /* example: route delete -inet6 2001:db8::/32 somegateway */ |
| |
| argv_printf(&argv, "%s delete -inet6 %s/%d %s", |
| ROUTE_PATH, |
| network, |
| r6->netbits, |
| gateway ); |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: Solaris route delete -inet6 command failed"); |
| |
| #elif defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) |
| |
| argv_printf(&argv, "%s delete -inet6 %s/%d", |
| ROUTE_PATH, |
| network, |
| r6->netbits ); |
| |
| if (gateway_needed) |
| { |
| argv_printf_cat(&argv, "%s", gateway); |
| } |
| else |
| { |
| argv_printf_cat(&argv, "-iface %s", device); |
| } |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: *BSD route delete -inet6 command failed"); |
| |
| #elif defined(TARGET_DARWIN) |
| |
| argv_printf(&argv, "%s delete -inet6 %s -prefixlen %d", |
| ROUTE_PATH, |
| network, r6->netbits ); |
| |
| if (gateway_needed) |
| { |
| argv_printf_cat(&argv, "%s", gateway); |
| } |
| else |
| { |
| argv_printf_cat(&argv, "-iface %s", device); |
| } |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: MacOS X route delete -inet6 command failed"); |
| |
| #elif defined(TARGET_OPENBSD) |
| |
| argv_printf(&argv, "%s delete -inet6 %s -prefixlen %d %s", |
| ROUTE_PATH, |
| network, r6->netbits, gateway ); |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: OpenBSD route delete -inet6 command failed"); |
| |
| #elif defined(TARGET_NETBSD) |
| |
| argv_printf(&argv, "%s delete -inet6 %s/%d %s", |
| ROUTE_PATH, |
| network, r6->netbits, gateway ); |
| |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: NetBSD route delete -inet6 command failed"); |
| |
| #elif defined(TARGET_AIX) |
| |
| argv_printf(&argv, "%s delete -inet6 %s/%d %s", |
| ROUTE_PATH, |
| network, r6->netbits, gateway); |
| argv_msg(D_ROUTE, &argv); |
| openvpn_execve_check(&argv, es, 0, "ERROR: AIX route add command failed"); |
| |
| #else /* if defined(TARGET_LINUX) */ |
| msg(M_FATAL, "Sorry, but I don't know how to do 'route ipv6' commands on this operating system. Try putting your routes in a --route-down script"); |
| #endif /* if defined(TARGET_LINUX) */ |
| |
| argv_free(&argv); |
| gc_free(&gc); |
| /* release resources potentially allocated during route cleanup */ |
| net_ctx_reset(ctx); |
| } |
| |
| /* |
| * The --redirect-gateway option requires OS-specific code below |
| * to get the current default gateway. |
| */ |
| |
| #if defined(_WIN32) |
| |
| static const MIB_IPFORWARDTABLE * |
| get_windows_routing_table(struct gc_arena *gc) |
| { |
| ULONG size = 0; |
| PMIB_IPFORWARDTABLE rt = NULL; |
| DWORD status; |
| |
| status = GetIpForwardTable(NULL, &size, TRUE); |
| if (status == ERROR_INSUFFICIENT_BUFFER) |
| { |
| rt = (PMIB_IPFORWARDTABLE) gc_malloc(size, false, gc); |
| status = GetIpForwardTable(rt, &size, TRUE); |
| if (status != NO_ERROR) |
| { |
| msg(D_ROUTE, "NOTE: GetIpForwardTable returned error: %s (code=%u)", |
| strerror_win32(status, gc), |
| (unsigned int)status); |
| rt = NULL; |
| } |
| } |
| return rt; |
| } |
| |
| static int |
| test_route(const IP_ADAPTER_INFO *adapters, |
| const in_addr_t gateway, |
| DWORD *index) |
| { |
| int count = 0; |
| DWORD i = adapter_index_of_ip(adapters, gateway, &count, NULL); |
| if (index) |
| { |
| *index = i; |
| } |
| return count; |
| } |
| |
| static void |
| test_route_helper(bool *ret, |
| int *count, |
| int *good, |
| int *ambig, |
| const IP_ADAPTER_INFO *adapters, |
| const in_addr_t gateway) |
| { |
| int c; |
| |
| ++*count; |
| c = test_route(adapters, gateway, NULL); |
| if (c == 0) |
| { |
| *ret = false; |
| } |
| else |
| { |
| ++*good; |
| } |
| if (c > 1) |
| { |
| ++*ambig; |
| } |
| } |
| |
| /* |
| * If we tried to add routes now, would we succeed? |
| */ |
| bool |
| test_routes(const struct route_list *rl, const struct tuntap *tt) |
| { |
| struct gc_arena gc = gc_new(); |
| const IP_ADAPTER_INFO *adapters = get_adapter_info_list(&gc); |
| bool ret = false; |
| int count = 0; |
| int good = 0; |
| int ambig = 0; |
| int len = -1; |
| bool adapter_up = false; |
| |
| if (is_adapter_up(tt, adapters)) |
| { |
| ret = true; |
| adapter_up = true; |
| |
| /* we do this test only if we have IPv4 routes to install, and if |
| * the tun/tap interface has seen IPv4 ifconfig - because if we |
| * have no IPv4, the check will always fail, failing tun init |
| */ |
| if (rl && tt->did_ifconfig_setup) |
| { |
| struct route_ipv4 *r; |
| for (r = rl->routes, len = 0; r; r = r->next, ++len) |
| { |
| test_route_helper(&ret, &count, &good, &ambig, adapters, r->gateway); |
| } |
| |
| if ((rl->flags & RG_ENABLE) && (rl->spec.flags & RTSA_REMOTE_ENDPOINT)) |
| { |
| test_route_helper(&ret, &count, &good, &ambig, adapters, rl->spec.remote_endpoint); |
| } |
| } |
| } |
| |
| msg(D_ROUTE, "TEST ROUTES: %d/%d succeeded len=%d ret=%d a=%d u/d=%s", |
| good, |
| count, |
| len, |
| (int)ret, |
| ambig, |
| adapter_up ? "up" : "down"); |
| |
| gc_free(&gc); |
| return ret; |
| } |
| |
| static const MIB_IPFORWARDROW * |
| get_default_gateway_row(const MIB_IPFORWARDTABLE *routes) |
| { |
| struct gc_arena gc = gc_new(); |
| DWORD lowest_metric = MAXDWORD; |
| const MIB_IPFORWARDROW *ret = NULL; |
| int i; |
| int best = -1; |
| |
| if (routes) |
| { |
| for (i = 0; i < routes->dwNumEntries; ++i) |
| { |
| const MIB_IPFORWARDROW *row = &routes->table[i]; |
| const in_addr_t net = ntohl(row->dwForwardDest); |
| const in_addr_t mask = ntohl(row->dwForwardMask); |
| const DWORD index = row->dwForwardIfIndex; |
| const DWORD metric = row->dwForwardMetric1; |
| |
| dmsg(D_ROUTE_DEBUG, "GDGR: route[%d] %s/%s i=%d m=%d", |
| i, |
| print_in_addr_t((in_addr_t) net, 0, &gc), |
| print_in_addr_t((in_addr_t) mask, 0, &gc), |
| (int)index, |
| (int)metric); |
| |
| if (!net && !mask && metric < lowest_metric) |
| { |
| ret = row; |
| lowest_metric = metric; |
| best = i; |
| } |
| } |
| } |
| |
| dmsg(D_ROUTE_DEBUG, "GDGR: best=%d lm=%u", best, (unsigned int)lowest_metric); |
| |
| gc_free(&gc); |
| return ret; |
| } |
| |
| void |
| get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc = gc_new(); |
| |
| const IP_ADAPTER_INFO *adapters = get_adapter_info_list(&gc); |
| const MIB_IPFORWARDTABLE *routes = get_windows_routing_table(&gc); |
| const MIB_IPFORWARDROW *row = get_default_gateway_row(routes); |
| DWORD a_index; |
| const IP_ADAPTER_INFO *ai; |
| |
| CLEAR(*rgi); |
| |
| if (row) |
| { |
| rgi->gateway.addr = ntohl(row->dwForwardNextHop); |
| if (rgi->gateway.addr) |
| { |
| rgi->flags |= RGI_ADDR_DEFINED; |
| a_index = adapter_index_of_ip(adapters, rgi->gateway.addr, NULL, &rgi->gateway.netmask); |
| if (a_index != TUN_ADAPTER_INDEX_INVALID) |
| { |
| rgi->adapter_index = a_index; |
| rgi->flags |= (RGI_IFACE_DEFINED|RGI_NETMASK_DEFINED); |
| ai = get_adapter(adapters, a_index); |
| if (ai) |
| { |
| memcpy(rgi->hwaddr, ai->Address, 6); |
| rgi->flags |= RGI_HWADDR_DEFINED; |
| } |
| } |
| } |
| } |
| |
| gc_free(&gc); |
| } |
| |
| static DWORD |
| windows_route_find_if_index(const struct route_ipv4 *r, const struct tuntap *tt) |
| { |
| struct gc_arena gc = gc_new(); |
| DWORD ret = TUN_ADAPTER_INDEX_INVALID; |
| int count = 0; |
| const IP_ADAPTER_INFO *adapters = get_adapter_info_list(&gc); |
| const IP_ADAPTER_INFO *tun_adapter = get_tun_adapter(tt, adapters); |
| bool on_tun = false; |
| |
| /* first test on tun interface */ |
| if (is_ip_in_adapter_subnet(tun_adapter, r->gateway, NULL)) |
| { |
| ret = tun_adapter->Index; |
| count = 1; |
| on_tun = true; |
| } |
| else /* test on other interfaces */ |
| { |
| count = test_route(adapters, r->gateway, &ret); |
| } |
| |
| if (count == 0) |
| { |
| msg(M_WARN, "Warning: route gateway is not reachable on any active network adapters: %s", |
| print_in_addr_t(r->gateway, 0, &gc)); |
| ret = TUN_ADAPTER_INDEX_INVALID; |
| } |
| else if (count > 1) |
| { |
| msg(M_WARN, "Warning: route gateway is ambiguous: %s (%d matches)", |
| print_in_addr_t(r->gateway, 0, &gc), |
| count); |
| } |
| |
| dmsg(D_ROUTE_DEBUG, "DEBUG: route find if: on_tun=%d count=%d index=%d", |
| on_tun, |
| count, |
| (int)ret); |
| |
| gc_free(&gc); |
| return ret; |
| } |
| |
| /* IPv6 implementation using GetBestRoute2() |
| * (TBD: dynamic linking so the binary can still run on XP?) |
| * https://msdn.microsoft.com/en-us/library/windows/desktop/aa365922(v=vs.85).aspx |
| * https://msdn.microsoft.com/en-us/library/windows/desktop/aa814411(v=vs.85).aspx |
| */ |
| void |
| get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6, |
| const struct in6_addr *dest, openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc = gc_new(); |
| MIB_IPFORWARD_ROW2 BestRoute; |
| SOCKADDR_INET DestinationAddress, BestSourceAddress; |
| DWORD BestIfIndex; |
| DWORD status; |
| NET_LUID InterfaceLuid; |
| |
| CLEAR(*rgi6); |
| CLEAR(InterfaceLuid); /* cleared = not used for lookup */ |
| CLEAR(DestinationAddress); |
| |
| DestinationAddress.si_family = AF_INET6; |
| if (dest) |
| { |
| DestinationAddress.Ipv6.sin6_addr = *dest; |
| } |
| |
| status = GetBestInterfaceEx( (struct sockaddr *)&DestinationAddress, &BestIfIndex ); |
| |
| if (status != NO_ERROR) |
| { |
| msg(D_ROUTE, "NOTE: GetBestInterfaceEx returned error: %s (code=%u)", |
| strerror_win32(status, &gc), |
| (unsigned int)status); |
| goto done; |
| } |
| |
| msg( D_ROUTE, "GetBestInterfaceEx() returned if=%d", (int) BestIfIndex ); |
| |
| status = GetBestRoute2( &InterfaceLuid, BestIfIndex, NULL, |
| &DestinationAddress, 0, |
| &BestRoute, &BestSourceAddress ); |
| |
| if (status != NO_ERROR) |
| { |
| msg(D_ROUTE, "NOTE: GetIpForwardEntry2 returned error: %s (code=%u)", |
| strerror_win32(status, &gc), |
| (unsigned int)status); |
| goto done; |
| } |
| |
| msg( D_ROUTE, "GDG6: II=%lu DP=%s/%d NH=%s", |
| BestRoute.InterfaceIndex, |
| print_in6_addr( BestRoute.DestinationPrefix.Prefix.Ipv6.sin6_addr, 0, &gc), |
| BestRoute.DestinationPrefix.PrefixLength, |
| print_in6_addr( BestRoute.NextHop.Ipv6.sin6_addr, 0, &gc) ); |
| msg( D_ROUTE, "GDG6: Metric=%d, Loopback=%d, AA=%d, I=%d", |
| (int) BestRoute.Metric, |
| (int) BestRoute.Loopback, |
| (int) BestRoute.AutoconfigureAddress, |
| (int) BestRoute.Immortal ); |
| |
| rgi6->gateway.addr_ipv6 = BestRoute.NextHop.Ipv6.sin6_addr; |
| rgi6->adapter_index = BestRoute.InterfaceIndex; |
| rgi6->flags |= RGI_ADDR_DEFINED | RGI_IFACE_DEFINED; |
| |
| /* on-link is signalled by receiving an empty (::) NextHop */ |
| if (IN6_IS_ADDR_UNSPECIFIED(&BestRoute.NextHop.Ipv6.sin6_addr) ) |
| { |
| rgi6->flags |= RGI_ON_LINK; |
| } |
| |
| done: |
| gc_free(&gc); |
| } |
| |
| bool |
| add_route_ipapi(const struct route_ipv4 *r, const struct tuntap *tt, DWORD adapter_index) |
| { |
| struct gc_arena gc = gc_new(); |
| bool ret = false; |
| DWORD status; |
| const DWORD if_index = (adapter_index == TUN_ADAPTER_INDEX_INVALID) ? windows_route_find_if_index(r, tt) : adapter_index; |
| |
| if (if_index != TUN_ADAPTER_INDEX_INVALID) |
| { |
| MIB_IPFORWARDROW fr; |
| CLEAR(fr); |
| fr.dwForwardDest = htonl(r->network); |
| fr.dwForwardMask = htonl(r->netmask); |
| fr.dwForwardPolicy = 0; |
| fr.dwForwardNextHop = htonl(r->gateway); |
| fr.dwForwardIfIndex = if_index; |
| fr.dwForwardType = 4; /* the next hop is not the final dest */ |
| fr.dwForwardProto = 3; /* PROTO_IP_NETMGMT */ |
| fr.dwForwardAge = 0; |
| fr.dwForwardNextHopAS = 0; |
| fr.dwForwardMetric1 = (r->flags & RT_METRIC_DEFINED) ? r->metric : 1; |
| fr.dwForwardMetric2 = METRIC_NOT_USED; |
| fr.dwForwardMetric3 = METRIC_NOT_USED; |
| fr.dwForwardMetric4 = METRIC_NOT_USED; |
| fr.dwForwardMetric5 = METRIC_NOT_USED; |
| |
| if ((r->network & r->netmask) != r->network) |
| { |
| msg(M_WARN, "Warning: address %s is not a network address in relation to netmask %s", |
| print_in_addr_t(r->network, 0, &gc), |
| print_in_addr_t(r->netmask, 0, &gc)); |
| } |
| |
| status = CreateIpForwardEntry(&fr); |
| |
| if (status == NO_ERROR) |
| { |
| ret = true; |
| } |
| else |
| { |
| /* failed, try increasing the metric to work around Vista issue */ |
| const unsigned int forward_metric_limit = 2048; /* iteratively retry higher metrics up to this limit */ |
| |
| for (; fr.dwForwardMetric1 <= forward_metric_limit; ++fr.dwForwardMetric1) |
| { |
| /* try a different forward type=3 ("the next hop is the final dest") in addition to 4. |
| * --redirect-gateway over RRAS seems to need this. */ |
| for (fr.dwForwardType = 4; fr.dwForwardType >= 3; --fr.dwForwardType) |
| { |
| status = CreateIpForwardEntry(&fr); |
| if (status == NO_ERROR) |
| { |
| msg(D_ROUTE, "ROUTE: CreateIpForwardEntry succeeded with dwForwardMetric1=%u and dwForwardType=%u", |
| (unsigned int)fr.dwForwardMetric1, |
| (unsigned int)fr.dwForwardType); |
| ret = true; |
| goto doublebreak; |
| } |
| else if (status != ERROR_BAD_ARGUMENTS) |
| { |
| goto doublebreak; |
| } |
| } |
| } |
| |
| doublebreak: |
| if (status != NO_ERROR) |
| { |
| msg(M_WARN, "ROUTE: route addition failed using CreateIpForwardEntry: %s [status=%u if_index=%u]", |
| strerror_win32(status, &gc), |
| (unsigned int)status, |
| (unsigned int)if_index); |
| } |
| } |
| } |
| |
| gc_free(&gc); |
| return ret; |
| } |
| |
| bool |
| del_route_ipapi(const struct route_ipv4 *r, const struct tuntap *tt) |
| { |
| struct gc_arena gc = gc_new(); |
| bool ret = false; |
| DWORD status; |
| const DWORD if_index = windows_route_find_if_index(r, tt); |
| |
| if (if_index != TUN_ADAPTER_INDEX_INVALID) |
| { |
| MIB_IPFORWARDROW fr; |
| CLEAR(fr); |
| |
| fr.dwForwardDest = htonl(r->network); |
| fr.dwForwardMask = htonl(r->netmask); |
| fr.dwForwardPolicy = 0; |
| fr.dwForwardNextHop = htonl(r->gateway); |
| fr.dwForwardIfIndex = if_index; |
| |
| status = DeleteIpForwardEntry(&fr); |
| |
| if (status == NO_ERROR) |
| { |
| ret = true; |
| } |
| else |
| { |
| msg(M_WARN, "ROUTE: route deletion failed using DeleteIpForwardEntry: %s", |
| strerror_win32(status, &gc)); |
| } |
| } |
| |
| gc_free(&gc); |
| return ret; |
| } |
| |
| static bool |
| do_route_service(const bool add, const route_message_t *rt, const size_t size, HANDLE pipe) |
| { |
| bool ret = false; |
| ack_message_t ack; |
| struct gc_arena gc = gc_new(); |
| |
| if (!send_msg_iservice(pipe, rt, size, &ack, "ROUTE")) |
| { |
| goto out; |
| } |
| |
| if (ack.error_number != NO_ERROR) |
| { |
| msg(M_WARN, "ROUTE: route %s failed using service: %s [status=%u if_index=%d]", |
| (add ? "addition" : "deletion"), strerror_win32(ack.error_number, &gc), |
| ack.error_number, rt->iface.index); |
| goto out; |
| } |
| |
| ret = true; |
| |
| out: |
| gc_free(&gc); |
| return ret; |
| } |
| |
| static bool |
| do_route_ipv4_service(const bool add, const struct route_ipv4 *r, const struct tuntap *tt) |
| { |
| DWORD if_index = windows_route_find_if_index(r, tt); |
| if (if_index == ~0) |
| { |
| return false; |
| } |
| |
| route_message_t msg = { |
| .header = { |
| (add ? msg_add_route : msg_del_route), |
| sizeof(route_message_t), |
| 0 |
| }, |
| .family = AF_INET, |
| .prefix.ipv4.s_addr = htonl(r->network), |
| .gateway.ipv4.s_addr = htonl(r->gateway), |
| .iface = { .index = if_index, .name = "" }, |
| .metric = (r->flags & RT_METRIC_DEFINED ? r->metric : -1) |
| }; |
| |
| netmask_to_netbits(r->network, r->netmask, &msg.prefix_len); |
| if (msg.prefix_len == -1) |
| { |
| msg.prefix_len = 32; |
| } |
| |
| return do_route_service(add, &msg, sizeof(msg), tt->options.msg_channel); |
| } |
| |
| static bool |
| do_route_ipv6_service(const bool add, const struct route_ipv6 *r, const struct tuntap *tt) |
| { |
| bool status; |
| route_message_t msg = { |
| .header = { |
| (add ? msg_add_route : msg_del_route), |
| sizeof(route_message_t), |
| 0 |
| }, |
| .family = AF_INET6, |
| .prefix.ipv6 = r->network, |
| .prefix_len = r->netbits, |
| .gateway.ipv6 = r->gateway, |
| .iface = { .index = tt->adapter_index, .name = "" }, |
| .metric = ( (r->flags & RT_METRIC_DEFINED) ? r->metric : -1) |
| }; |
| |
| if (r->adapter_index) /* vpn server special route */ |
| { |
| msg.iface.index = r->adapter_index; |
| } |
| |
| /* In TUN mode we use a special link-local address as the next hop. |
| * The tapdrvr knows about it and will answer neighbor discovery packets. |
| * (only do this for routes actually using the tun/tap device) |
| */ |
| if (tt->type == DEV_TYPE_TUN |
| && msg.iface.index == tt->adapter_index) |
| { |
| inet_pton(AF_INET6, "fe80::8", &msg.gateway.ipv6); |
| } |
| |
| if (msg.iface.index == TUN_ADAPTER_INDEX_INVALID) |
| { |
| strncpy(msg.iface.name, tt->actual_name, sizeof(msg.iface.name)); |
| msg.iface.name[sizeof(msg.iface.name) - 1] = '\0'; |
| } |
| |
| status = do_route_service(add, &msg, sizeof(msg), tt->options.msg_channel); |
| msg(D_ROUTE, "IPv6 route %s via service %s", |
| add ? "addition" : "deletion", |
| status ? "succeeded" : "failed"); |
| return status; |
| } |
| |
| static bool |
| add_route_service(const struct route_ipv4 *r, const struct tuntap *tt) |
| { |
| return do_route_ipv4_service(true, r, tt); |
| } |
| |
| static bool |
| del_route_service(const struct route_ipv4 *r, const struct tuntap *tt) |
| { |
| return do_route_ipv4_service(false, r, tt); |
| } |
| |
| static bool |
| add_route_ipv6_service(const struct route_ipv6 *r, const struct tuntap *tt) |
| { |
| return do_route_ipv6_service(true, r, tt); |
| } |
| |
| static bool |
| del_route_ipv6_service(const struct route_ipv6 *r, const struct tuntap *tt) |
| { |
| return do_route_ipv6_service(false, r, tt); |
| } |
| |
| static const char * |
| format_route_entry(const MIB_IPFORWARDROW *r, struct gc_arena *gc) |
| { |
| struct buffer out = alloc_buf_gc(256, gc); |
| buf_printf(&out, "%s %s %s p=%d i=%d t=%d pr=%d a=%d h=%d m=%d/%d/%d/%d/%d", |
| print_in_addr_t(r->dwForwardDest, IA_NET_ORDER, gc), |
| print_in_addr_t(r->dwForwardMask, IA_NET_ORDER, gc), |
| print_in_addr_t(r->dwForwardNextHop, IA_NET_ORDER, gc), |
| (int)r->dwForwardPolicy, |
| (int)r->dwForwardIfIndex, |
| (int)r->dwForwardType, |
| (int)r->dwForwardProto, |
| (int)r->dwForwardAge, |
| (int)r->dwForwardNextHopAS, |
| (int)r->dwForwardMetric1, |
| (int)r->dwForwardMetric2, |
| (int)r->dwForwardMetric3, |
| (int)r->dwForwardMetric4, |
| (int)r->dwForwardMetric5); |
| return BSTR(&out); |
| } |
| |
| /* |
| * Show current routing table |
| */ |
| void |
| show_routes(int msglev) |
| { |
| struct gc_arena gc = gc_new(); |
| int i; |
| |
| const MIB_IPFORWARDTABLE *rt = get_windows_routing_table(&gc); |
| |
| msg(msglev, "SYSTEM ROUTING TABLE"); |
| if (rt) |
| { |
| for (i = 0; i < rt->dwNumEntries; ++i) |
| { |
| msg(msglev, "%s", format_route_entry(&rt->table[i], &gc)); |
| } |
| } |
| gc_free(&gc); |
| } |
| |
| #elif defined(TARGET_ANDROID) |
| |
| void |
| get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx) |
| { |
| /* Android, set some pseudo GW, addr is in host byte order, |
| * Determining the default GW on Android 5.0+ is non trivial |
| * and serves almost no purpose since OpenVPN only uses the |
| * default GW address to add routes for networks that should |
| * NOT be routed over the VPN. Using a well known address |
| * (127.'d'.'g'.'w') for the default GW make detecting |
| * these routes easier from the controlling app. |
| */ |
| CLEAR(*rgi); |
| |
| rgi->gateway.addr = 127 << 24 | 'd' << 16 | 'g' << 8 | 'w'; |
| rgi->flags = RGI_ADDR_DEFINED | RGI_IFACE_DEFINED; |
| strcpy(rgi->iface, "android-gw"); |
| |
| /* Skip scanning/fetching interface from loopback interface we do |
| * normally on Linux. |
| * It always fails and "ioctl(SIOCGIFCONF) failed" confuses users |
| */ |
| |
| } |
| |
| void |
| get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6, |
| const struct in6_addr *dest, openvpn_net_ctx_t *ctx) |
| { |
| /* Same for ipv6 */ |
| |
| CLEAR(*rgi6); |
| |
| /* Use a fake link-local address */ |
| ASSERT(inet_pton(AF_INET6, "fe80::ad", &rgi6->addrs->addr_ipv6) == 1); |
| rgi6->addrs->netbits_ipv6 = 64; |
| rgi6->flags = RGI_ADDR_DEFINED | RGI_IFACE_DEFINED; |
| strcpy(rgi6->iface, "android-gw"); |
| } |
| |
| #elif defined(TARGET_LINUX) |
| |
| void |
| get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc = gc_new(); |
| int sd = -1; |
| char best_name[IFNAMSIZ]; |
| |
| CLEAR(*rgi); |
| CLEAR(best_name); |
| |
| /* get default gateway IP addr */ |
| if (net_route_v4_best_gw(ctx, NULL, &rgi->gateway.addr, best_name) == 0) |
| { |
| rgi->flags |= RGI_ADDR_DEFINED; |
| if (!rgi->gateway.addr && best_name[0]) |
| { |
| rgi->flags |= RGI_ON_LINK; |
| } |
| } |
| |
| /* scan adapter list */ |
| if (rgi->flags & RGI_ADDR_DEFINED) |
| { |
| struct ifreq *ifr, *ifend; |
| in_addr_t addr, netmask; |
| struct ifreq ifreq; |
| struct ifconf ifc; |
| struct ifreq ifs[20]; /* Maximum number of interfaces to scan */ |
| |
| if ((sd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) |
| { |
| msg(M_WARN, "GDG: socket() failed"); |
| goto done; |
| } |
| ifc.ifc_len = sizeof(ifs); |
| ifc.ifc_req = ifs; |
| if (ioctl(sd, SIOCGIFCONF, &ifc) < 0) |
| { |
| msg(M_WARN, "GDG: ioctl(SIOCGIFCONF) failed"); |
| goto done; |
| } |
| |
| /* scan through interface list */ |
| ifend = ifs + (ifc.ifc_len / sizeof(struct ifreq)); |
| for (ifr = ifc.ifc_req; ifr < ifend; ifr++) |
| { |
| if (ifr->ifr_addr.sa_family == AF_INET) |
| { |
| /* get interface addr */ |
| addr = ntohl(((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr); |
| |
| /* get interface name */ |
| strncpynt(ifreq.ifr_name, ifr->ifr_name, sizeof(ifreq.ifr_name)); |
| |
| /* check that the interface is up */ |
| if (ioctl(sd, SIOCGIFFLAGS, &ifreq) < 0) |
| { |
| continue; |
| } |
| if (!(ifreq.ifr_flags & IFF_UP)) |
| { |
| continue; |
| } |
| |
| if (rgi->flags & RGI_ON_LINK) |
| { |
| /* check that interface name of current interface |
| * matches interface name of best default route */ |
| if (strcmp(ifreq.ifr_name, best_name)) |
| { |
| continue; |
| } |
| #if 0 |
| /* if point-to-point link, use remote addr as route gateway */ |
| if ((ifreq.ifr_flags & IFF_POINTOPOINT) && ioctl(sd, SIOCGIFDSTADDR, &ifreq) >= 0) |
| { |
| rgi->gateway.addr = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr); |
| if (rgi->gateway.addr) |
| { |
| rgi->flags &= ~RGI_ON_LINK; |
| } |
| } |
| #endif |
| } |
| else |
| { |
| /* get interface netmask */ |
| if (ioctl(sd, SIOCGIFNETMASK, &ifreq) < 0) |
| { |
| continue; |
| } |
| netmask = ntohl(((struct sockaddr_in *) &ifreq.ifr_addr)->sin_addr.s_addr); |
| |
| /* check that interface matches default route */ |
| if (((rgi->gateway.addr ^ addr) & netmask) != 0) |
| { |
| continue; |
| } |
| |
| /* save netmask */ |
| rgi->gateway.netmask = netmask; |
| rgi->flags |= RGI_NETMASK_DEFINED; |
| } |
| |
| /* save iface name */ |
| strncpynt(rgi->iface, ifreq.ifr_name, sizeof(rgi->iface)); |
| rgi->flags |= RGI_IFACE_DEFINED; |
| |
| /* now get the hardware address. */ |
| memset(&ifreq.ifr_hwaddr, 0, sizeof(struct sockaddr)); |
| if (ioctl(sd, SIOCGIFHWADDR, &ifreq) < 0) |
| { |
| msg(M_WARN, "GDG: SIOCGIFHWADDR(%s) failed", ifreq.ifr_name); |
| goto done; |
| } |
| memcpy(rgi->hwaddr, &ifreq.ifr_hwaddr.sa_data, 6); |
| rgi->flags |= RGI_HWADDR_DEFINED; |
| |
| break; |
| } |
| } |
| } |
| |
| done: |
| if (sd >= 0) |
| { |
| close(sd); |
| } |
| gc_free(&gc); |
| } |
| |
| /* IPv6 implementation using netlink |
| * http://www.linuxjournal.com/article/7356 |
| * netlink(3), netlink(7), rtnetlink(7) |
| * http://www.virtualbox.org/svn/vbox/trunk/src/VBox/NetworkServices/NAT/rtmon_linux.c |
| */ |
| struct rtreq { |
| struct nlmsghdr nh; |
| struct rtmsg rtm; |
| char attrbuf[512]; |
| }; |
| |
| void |
| get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6, |
| const struct in6_addr *dest, openvpn_net_ctx_t *ctx) |
| { |
| int flags; |
| |
| CLEAR(*rgi6); |
| |
| if (net_route_v6_best_gw(ctx, dest, &rgi6->gateway.addr_ipv6, |
| rgi6->iface) == 0) |
| { |
| if (!IN6_IS_ADDR_UNSPECIFIED(rgi6->gateway.addr_ipv6.s6_addr)) |
| { |
| rgi6->flags |= RGI_ADDR_DEFINED; |
| } |
| |
| if (strlen(rgi6->iface) > 0) |
| { |
| rgi6->flags |= RGI_IFACE_DEFINED; |
| } |
| } |
| |
| /* if we have an interface but no gateway, the destination is on-link */ |
| flags = rgi6->flags & (RGI_IFACE_DEFINED | RGI_ADDR_DEFINED); |
| if (flags == RGI_IFACE_DEFINED) |
| { |
| rgi6->flags |= (RGI_ADDR_DEFINED | RGI_ON_LINK); |
| if (dest) |
| { |
| rgi6->gateway.addr_ipv6 = *dest; |
| } |
| } |
| } |
| |
| #elif defined(TARGET_DARWIN) || defined(TARGET_SOLARIS) \ |
| || defined(TARGET_FREEBSD) || defined(TARGET_DRAGONFLY) \ |
| || defined(TARGET_OPENBSD) || defined(TARGET_NETBSD) |
| |
| #include <sys/types.h> |
| #include <sys/socket.h> |
| #include <netinet/in.h> |
| #include <net/route.h> |
| #include <net/if_dl.h> |
| |
| struct rtmsg { |
| struct rt_msghdr m_rtm; |
| char m_space[512]; |
| }; |
| |
| /* the route socket code is identical for all 4 supported BSDs and for |
| * MacOS X (Darwin), with one crucial difference: when going from |
| * 32 bit to 64 bit, FreeBSD/OpenBSD increased the structure size but kept |
| * source code compatibility by keeping the use of "long", while |
| * MacOS X decided to keep binary compatibility by *changing* the API |
| * to use "uint32_t", thus 32 bit on all OS X variants |
| * |
| * NetBSD does the MacOS way of "fixed number of bits, no matter if |
| * 32 or 64 bit OS", but chose uint64_t. For maximum portability, we |
| * just use the OS RT_ROUNDUP() macro, which is guaranteed to be correct. |
| * |
| * We used to have a large amount of duplicate code here which really |
| * differed only in this (long) vs. (uint32_t) - IMHO, worse than |
| * having a combined block for all BSDs with this single #ifdef inside |
| */ |
| |
| #if defined(TARGET_DARWIN) |
| #define ROUNDUP(a) \ |
| ((a) > 0 ? (1 + (((a) - 1) | (sizeof(uint32_t) - 1))) : sizeof(uint32_t)) |
| #elif defined(TARGET_NETBSD) |
| #define ROUNDUP(a) RT_ROUNDUP(a) |
| #else |
| #define ROUNDUP(a) \ |
| ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long)) |
| #endif |
| |
| #if defined(TARGET_SOLARIS) |
| #define NEXTADDR(w, u) \ |
| if (rtm_addrs & (w)) { \ |
| l = sizeof(u); memmove(cp, &(u), l); cp += ROUNDUP(l); \ |
| } |
| |
| #define ADVANCE(x, n) (x += ROUNDUP(sizeof(struct sockaddr_in))) |
| #else /* if defined(TARGET_SOLARIS) */ |
| #define NEXTADDR(w, u) \ |
| if (rtm_addrs & (w)) { \ |
| l = ((struct sockaddr *)&(u))->sa_len; memmove(cp, &(u), l); cp += ROUNDUP(l); \ |
| } |
| |
| #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len)) |
| #endif |
| |
| #define max(a,b) ((a) > (b) ? (a) : (b)) |
| |
| void |
| get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx) |
| { |
| struct gc_arena gc = gc_new(); |
| struct rtmsg m_rtmsg; |
| int sockfd = -1; |
| int seq, l, pid, rtm_addrs; |
| unsigned int i; |
| struct sockaddr so_dst, so_mask; |
| char *cp = m_rtmsg.m_space; |
| struct sockaddr *gate = NULL, *ifp = NULL, *sa; |
| struct rt_msghdr *rtm_aux; |
| |
| #define rtm m_rtmsg.m_rtm |
| |
| CLEAR(*rgi); |
| |
| /* setup data to send to routing socket */ |
| pid = getpid(); |
| seq = 0; |
| rtm_addrs = RTA_DST | RTA_NETMASK | RTA_IFP; |
| |
| bzero(&m_rtmsg, sizeof(m_rtmsg)); |
| bzero(&so_dst, sizeof(so_dst)); |
| bzero(&so_mask, sizeof(so_mask)); |
| bzero(&rtm, sizeof(struct rt_msghdr)); |
| |
| rtm.rtm_type = RTM_GET; |
| rtm.rtm_flags = RTF_UP | RTF_GATEWAY; |
| rtm.rtm_version = RTM_VERSION; |
| rtm.rtm_seq = ++seq; |
| #ifdef TARGET_OPENBSD |
| rtm.rtm_tableid = getrtable(); |
| #endif |
| rtm.rtm_addrs = rtm_addrs; |
| |
| so_dst.sa_family = AF_INET; |
| so_mask.sa_family = AF_INET; |
| |
| #ifndef TARGET_SOLARIS |
| so_dst.sa_len = sizeof(struct sockaddr_in); |
| so_mask.sa_len = sizeof(struct sockaddr_in); |
| #endif |
| |
| NEXTADDR(RTA_DST, so_dst); |
| NEXTADDR(RTA_NETMASK, so_mask); |
| |
| rtm.rtm_msglen = l = cp - (char *)&m_rtmsg; |
| |
| /* transact with routing socket */ |
| sockfd = socket(PF_ROUTE, SOCK_RAW, 0); |
| if (sockfd < 0) |
| { |
| msg(M_WARN, "GDG: socket #1 failed"); |
| goto done; |
| } |
| if (write(sockfd, (char *)&m_rtmsg, l) < 0) |
| { |
| msg(M_WARN, "GDG: problem writing to routing socket"); |
| goto done; |
| } |
| do |
| { |
| l = read(sockfd, (char *)&m_rtmsg, sizeof(m_rtmsg)); |
| } while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid)); |
| close(sockfd); |
| sockfd = -1; |
| |
| /* extract return data from routing socket */ |
| rtm_aux = &rtm; |
| cp = ((char *)(rtm_aux + 1)); |
| if (rtm_aux->rtm_addrs) |
| { |
| for (i = 1; i; i <<= 1) |
| { |
| if (i & rtm_aux->rtm_addrs) |
| { |
| sa = (struct sockaddr *)cp; |
| if (i == RTA_GATEWAY) |
| { |
| gate = sa; |
| } |
| else if (i == RTA_IFP) |
| { |
| ifp = sa; |
| } |
| ADVANCE(cp, sa); |
| } |
| } |
| } |
| else |
| { |
| goto done; |
| } |
| |
| /* get gateway addr and interface name */ |
| if (gate != NULL) |
| { |
| /* get default gateway addr */ |
| rgi->gateway.addr = ntohl(((struct sockaddr_in *)gate)->sin_addr.s_addr); |
| if (rgi->gateway.addr) |
| { |
| rgi->flags |= RGI_ADDR_DEFINED; |
| } |
| |
| if (ifp) |
| { |
| /* get interface name */ |
| const struct sockaddr_dl *adl = (struct sockaddr_dl *) ifp; |
| if (adl->sdl_nlen && adl->sdl_nlen < sizeof(rgi->iface)) |
| { |
| memcpy(rgi->iface, adl->sdl_data, adl->sdl_nlen); |
| rgi->iface[adl->sdl_nlen] = '\0'; |
| rgi->flags |= RGI_IFACE_DEFINED; |
| } |
| } |
| } |
| |
| /* get netmask of interface that owns default gateway */ |
| if (rgi->flags & RGI_IFACE_DEFINED) |
| { |
| struct ifreq ifr; |
| |
| sockfd = socket(AF_INET, SOCK_DGRAM, 0); |
| if (sockfd < 0) |
| { |
| msg(M_WARN, "GDG: socket #2 failed"); |
| goto done; |
| } |
| |
| CLEAR(ifr); |
| ifr.ifr_addr.sa_family = AF_INET; |
| strncpynt(ifr.ifr_name, rgi->iface, IFNAMSIZ); |
| |
| if (ioctl(sockfd, SIOCGIFNETMASK, (char *)&ifr) < 0) |
| { |
| msg(M_WARN, "GDG: ioctl #1 failed"); |
| goto done; |
| } |
| close(sockfd); |
| sockfd = -1; |
| |
| rgi->gateway.netmask = ntohl(((struct sockaddr_in *)&ifr.ifr_addr)->sin_addr.s_addr); |
| rgi->flags |= RGI_NETMASK_DEFINED; |
| } |
| |
| /* try to read MAC addr associated with interface that owns default gateway */ |
| if (rgi->flags & RGI_IFACE_DEFINED) |
| { |
| struct ifconf ifc; |
| struct ifreq *ifr; |
| const int bufsize = 4096; |
| char *buffer; |
| |
| buffer = (char *) gc_malloc(bufsize, true, &gc); |
| sockfd = socket(AF_INET, SOCK_DGRAM, 0); |
| if (sockfd < 0) |
| { |
| msg(M_WARN, "GDG: socket #3 failed"); |
| goto done; |
| } |
| |
| ifc.ifc_len = bufsize; |
| ifc.ifc_buf = buffer; |
| |
| if (ioctl(sockfd, SIOCGIFCONF, (char *)&ifc) < 0) |
| { |
| msg(M_WARN, "GDG: ioctl #2 failed"); |
| goto done; |
| } |
| close(sockfd); |
| sockfd = -1; |
| |
| for (cp = buffer; cp <= buffer + ifc.ifc_len - sizeof(struct ifreq); ) |
| { |
| ifr = (struct ifreq *)cp; |
| #if defined(TARGET_SOLARIS) |
| const size_t len = sizeof(ifr->ifr_name) + sizeof(ifr->ifr_addr); |
| #else |
| const size_t len = sizeof(ifr->ifr_name) + max(sizeof(ifr->ifr_addr), ifr->ifr_addr.sa_len); |
| #endif |
| |
| if (!ifr->ifr_addr.sa_family) |
| { |
| break; |
| } |
| if (!strncmp(ifr->ifr_name, rgi->iface, IFNAMSIZ)) |
| { |
| if (ifr->ifr_addr.sa_family == AF_LINK) |
| { |
| struct sockaddr_dl *sdl = (struct sockaddr_dl *)&ifr->ifr_addr; |
| memcpy(rgi->hwaddr, LLADDR(sdl), 6); |
| rgi->flags |= RGI_HWADDR_DEFINED; |
| } |
| } |
| cp += len; |
| } |
| } |
| |
| done: |
| if (sockfd >= 0) |
| { |
| close(sockfd); |
| } |
| gc_free(&gc); |
| } |
| |
| /* BSD implementation using routing socket (as does IPv4) |
| * (the code duplication is somewhat unavoidable if we want this to |
| * work on OpenSolaris as well. *sigh*) |
| */ |
| |
| /* Solaris has no length field - this is ugly, but less #ifdef in total |
| */ |
| #if defined(TARGET_SOLARIS) |
| #undef ADVANCE |
| #define ADVANCE(x, n) (x += ROUNDUP(sizeof(struct sockaddr_in6))) |
| #endif |
| |
| void |
| get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6, |
| const struct in6_addr *dest, openvpn_net_ctx_t *ctx) |
| { |
| |
| struct rtmsg m_rtmsg; |
| int sockfd = -1; |
| int seq, l, pid, rtm_addrs; |
| unsigned int i; |
| struct sockaddr_in6 so_dst, so_mask; |
| char *cp = m_rtmsg.m_space; |
| struct sockaddr *gate = NULL, *ifp = NULL, *sa; |
| struct rt_msghdr *rtm_aux; |
| |
| CLEAR(*rgi6); |
| |
| /* setup data to send to routing socket */ |
| pid = getpid(); |
| seq = 0; |
| rtm_addrs = RTA_DST | RTA_NETMASK | RTA_IFP; |
| |
| bzero(&m_rtmsg, sizeof(m_rtmsg)); |
| bzero(&so_dst, sizeof(so_dst)); |
| bzero(&so_mask, sizeof(so_mask)); |
| bzero(&rtm, sizeof(struct rt_msghdr)); |
| |
| rtm.rtm_type = RTM_GET; |
| rtm.rtm_flags = RTF_UP; |
| rtm.rtm_version = RTM_VERSION; |
| rtm.rtm_seq = ++seq; |
| #ifdef TARGET_OPENBSD |
| rtm.rtm_tableid = getrtable(); |
| #endif |
| |
| so_dst.sin6_family = AF_INET6; |
| so_mask.sin6_family = AF_INET6; |
| |
| if (dest != NULL /* specific host? */ |
| && !IN6_IS_ADDR_UNSPECIFIED(dest) ) |
| { |
| so_dst.sin6_addr = *dest; |
| /* :: needs /0 "netmask", host route wants "no netmask */ |
| rtm_addrs &= ~RTA_NETMASK; |
| } |
| |
| rtm.rtm_addrs = rtm_addrs; |
| |
| #ifndef TARGET_SOLARIS |
| so_dst.sin6_len = sizeof(struct sockaddr_in6); |
| so_mask.sin6_len = sizeof(struct sockaddr_in6); |
| #endif |
| |
| NEXTADDR(RTA_DST, so_dst); |
| NEXTADDR(RTA_NETMASK, so_mask); |
| |
| rtm.rtm_msglen = l = cp - (char *)&m_rtmsg; |
| |
| /* transact with routing socket */ |
| sockfd = socket(PF_ROUTE, SOCK_RAW, 0); |
| if (sockfd < 0) |
| { |
| msg(M_WARN, "GDG6: socket #1 failed"); |
| goto done; |
| } |
| if (write(sockfd, (char *)&m_rtmsg, l) < 0) |
| { |
| msg(M_WARN|M_ERRNO, "GDG6: problem writing to routing socket"); |
| goto done; |
| } |
| |
| do |
| { |
| l = read(sockfd, (char *)&m_rtmsg, sizeof(m_rtmsg)); |
| } |
| while (l > 0 && (rtm.rtm_seq != seq || rtm.rtm_pid != pid)); |
| |
| close(sockfd); |
| sockfd = -1; |
| |
| /* extract return data from routing socket */ |
| rtm_aux = &rtm; |
| cp = ((char *)(rtm_aux + 1)); |
| if (rtm_aux->rtm_addrs) |
| { |
| for (i = 1; i; i <<= 1) |
| { |
| if (i & rtm_aux->rtm_addrs) |
| { |
| sa = (struct sockaddr *)cp; |
| if (i == RTA_GATEWAY) |
| { |
| gate = sa; |
| } |
| else if (i == RTA_IFP) |
| { |
| ifp = sa; |
| } |
| ADVANCE(cp, sa); |
| } |
| } |
| } |
| else |
| { |
| goto done; |
| } |
| |
| /* get gateway addr and interface name */ |
| if (gate != NULL) |
| { |
| struct sockaddr_in6 *s6 = (struct sockaddr_in6 *)gate; |
| struct in6_addr gw = s6->sin6_addr; |
| |
| #ifndef TARGET_SOLARIS |
| /* You do not really want to know... from FreeBSD's route.c |
| * (KAME encodes the 16 bit scope_id in s6_addr[2] + [3], |
| * but for a correct link-local address these must be :0000: ) |
| */ |
| if (gate->sa_len == sizeof(struct sockaddr_in6) |
| && IN6_IS_ADDR_LINKLOCAL(&gw) ) |
| { |
| gw.s6_addr[2] = gw.s6_addr[3] = 0; |
| } |
| |
| if (gate->sa_len != sizeof(struct sockaddr_in6) |
| || IN6_IS_ADDR_UNSPECIFIED(&gw) ) |
| { |
| rgi6->flags |= RGI_ON_LINK; |
| } |
| else |
| #endif |
| |
| rgi6->gateway.addr_ipv6 = gw; |
| rgi6->flags |= RGI_ADDR_DEFINED; |
| |
| if (ifp) |
| { |
| /* get interface name */ |
| const struct sockaddr_dl *adl = (struct sockaddr_dl *) ifp; |
| if (adl->sdl_nlen && adl->sdl_nlen < sizeof(rgi6->iface)) |
| { |
| memcpy(rgi6->iface, adl->sdl_data, adl->sdl_nlen); |
| rgi6->flags |= RGI_IFACE_DEFINED; |
| } |
| } |
| } |
| |
| done: |
| if (sockfd >= 0) |
| { |
| close(sockfd); |
| } |
| } |
| |
| #undef max |
| |
| #else /* if defined(_WIN32) */ |
| |
| /* |
| * This is a platform-specific method that returns data about |
| * the current default gateway. Return data is placed into |
| * a struct route_gateway_info object provided by caller. The |
| * implementation should CLEAR the structure before adding |
| * data to it. |
| * |
| * Data returned includes: |
| * 1. default gateway address (rgi->gateway.addr) |
| * 2. netmask of interface that owns default gateway |
| * (rgi->gateway.netmask) |
| * 3. hardware address (i.e. MAC address) of interface that owns |
| * default gateway (rgi->hwaddr) |
| * 4. interface name (or adapter index on Windows) that owns default |
| * gateway (rgi->iface or rgi->adapter_index) |
| * 5. an array of additional address/netmask pairs defined by |
| * interface that owns default gateway (rgi->addrs with length |
| * given in rgi->n_addrs) |
| * |
| * The flags RGI_x_DEFINED may be used to indicate which of the data |
| * members were successfully returned (set in rgi->flags). All of |
| * the data members are optional, however certain OpenVPN functionality |
| * may be disabled by missing items. |
| */ |
| void |
| get_default_gateway(struct route_gateway_info *rgi, openvpn_net_ctx_t *ctx) |
| { |
| CLEAR(*rgi); |
| } |
| void |
| get_default_gateway_ipv6(struct route_ipv6_gateway_info *rgi6, |
| const struct in6_addr *dest, openvpn_net_ctx_t *ctx) |
| { |
| msg(D_ROUTE, "no support for get_default_gateway_ipv6() on this system"); |
| CLEAR(*rgi6); |
| } |
| |
| #endif /* if defined(_WIN32) */ |
| |
| bool |
| netmask_to_netbits(const in_addr_t network, const in_addr_t netmask, int *netbits) |
| { |
| int i; |
| const int addrlen = sizeof(in_addr_t) * 8; |
| |
| if ((network & netmask) == network) |
| { |
| for (i = 0; i <= addrlen; ++i) |
| { |
| in_addr_t mask = netbits_to_netmask(i); |
| if (mask == netmask) |
| { |
| if (i == addrlen) |
| { |
| *netbits = -1; |
| } |
| else |
| { |
| *netbits = i; |
| } |
| return true; |
| } |
| } |
| } |
| return false; |
| } |
| |
| /* similar to netmask_to_netbits(), but don't mess with base address |
| * etc., just convert to netbits - non-mappable masks are returned as "-1" |
| */ |
| int |
| netmask_to_netbits2(in_addr_t netmask) |
| { |
| int i; |
| const int addrlen = sizeof(in_addr_t) * 8; |
| |
| for (i = 0; i <= addrlen; ++i) |
| { |
| in_addr_t mask = netbits_to_netmask(i); |
| if (mask == netmask) |
| { |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| |
| /* |
| * get_bypass_addresses() is used by the redirect-gateway bypass-x |
| * functions to build a route bypass to selected DHCP/DNS servers, |
| * so that outgoing packets to these servers don't end up in the tunnel. |
| */ |
| |
| #if defined(_WIN32) |
| |
| static void |
| add_host_route_if_nonlocal(struct route_bypass *rb, const in_addr_t addr) |
| { |
| if (test_local_addr(addr, NULL) == TLA_NONLOCAL && addr != 0 && addr != IPV4_NETMASK_HOST) |
| { |
| add_bypass_address(rb, addr); |
| } |
| } |
| |
| static void |
| add_host_route_array(struct route_bypass *rb, const IP_ADDR_STRING *iplist) |
| { |
| while (iplist) |
| { |
| bool succeed = false; |
| const in_addr_t ip = getaddr(GETADDR_HOST_ORDER, iplist->IpAddress.String, 0, &succeed, NULL); |
| if (succeed) |
| { |
| add_host_route_if_nonlocal(rb, ip); |
| } |
| iplist = iplist->Next; |
| } |
| } |
| |
| static void |
| get_bypass_addresses(struct route_bypass *rb, const unsigned int flags) |
| { |
| struct gc_arena gc = gc_new(); |
| /*bool ret_bool = false;*/ |
| |
| /* get full routing table */ |
| const MIB_IPFORWARDTABLE *routes = get_windows_routing_table(&gc); |
| |
| /* get the route which represents the default gateway */ |
| const MIB_IPFORWARDROW *row = get_default_gateway_row(routes); |
| |
| if (row) |
| { |
| /* get the adapter which the default gateway is associated with */ |
| const IP_ADAPTER_INFO *dgi = get_adapter_info(row->dwForwardIfIndex, &gc); |
| |
| /* get extra adapter info, such as DNS addresses */ |
| const IP_PER_ADAPTER_INFO *pai = get_per_adapter_info(row->dwForwardIfIndex, &gc); |
| |
| /* Bypass DHCP server address */ |
| if ((flags & RG_BYPASS_DHCP) && dgi && dgi->DhcpEnabled) |
| { |
| add_host_route_array(rb, &dgi->DhcpServer); |
| } |
| |
| /* Bypass DNS server addresses */ |
| if ((flags & RG_BYPASS_DNS) && pai) |
| { |
| add_host_route_array(rb, &pai->DnsServerList); |
| } |
| } |
| |
| gc_free(&gc); |
| } |
| |
| #else /* if defined(_WIN32) */ |
| |
| static void |
| get_bypass_addresses(struct route_bypass *rb, const unsigned int flags) /* PLATFORM-SPECIFIC */ |
| { |
| } |
| |
| #endif /* if defined(_WIN32) */ |
| |
| /* |
| * Test if addr is reachable via a local interface (return ILA_LOCAL), |
| * or if it needs to be routed via the default gateway (return |
| * ILA_NONLOCAL). If the target platform doesn't implement this |
| * function, return ILA_NOT_IMPLEMENTED. |
| * |
| * Used by redirect-gateway autolocal feature |
| */ |
| |
| #if defined(_WIN32) |
| |
| int |
| test_local_addr(const in_addr_t addr, const struct route_gateway_info *rgi) |
| { |
| struct gc_arena gc = gc_new(); |
| const in_addr_t nonlocal_netmask = 0x80000000L; /* routes with netmask <= to this are considered non-local */ |
| int ret = TLA_NONLOCAL; |
| |
| /* get full routing table */ |
| const MIB_IPFORWARDTABLE *rt = get_windows_routing_table(&gc); |
| if (rt) |
| { |
| int i; |
| for (i = 0; i < rt->dwNumEntries; ++i) |
| { |
| const MIB_IPFORWARDROW *row = &rt->table[i]; |
| const in_addr_t net = ntohl(row->dwForwardDest); |
| const in_addr_t mask = ntohl(row->dwForwardMask); |
| if (mask > nonlocal_netmask && (addr & mask) == net) |
| { |
| ret = TLA_LOCAL; |
| break; |
| } |
| } |
| } |
| |
| gc_free(&gc); |
| return ret; |
| } |
| |
| #else /* if defined(_WIN32) */ |
| |
| int |
| test_local_addr(const in_addr_t addr, const struct route_gateway_info *rgi) /* PLATFORM-SPECIFIC */ |
| { |
| if (rgi) |
| { |
| if (local_route(addr, 0xFFFFFFFF, rgi->gateway.addr, rgi)) |
| { |
| return TLA_LOCAL; |
| } |
| else |
| { |
| return TLA_NONLOCAL; |
| } |
| } |
| return TLA_NOT_IMPLEMENTED; |
| } |
| |
| #endif /* if defined(_WIN32) */ |