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- /* vim: set expandtab ts=4 sw=4: */
- /*
- * You may redistribute this program and/or modify it under the terms of
- * the GNU General Public License as published by the Free Software Foundation,
- * either version 3 of the License, or (at your option) any later version.
- *
- * 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, see <https://www.gnu.org/licenses/>.
- */
- #include "exception/Except.h"
- #include "util/platform/netdev/NetPlatform.h"
- #include "util/AddrTools.h"
- #include "util/platform/Sockaddr.h"
- #include "util/Assert.h"
- #include "util/Bits.h"
- #include "util/CString.h"
- #include "wire/Message.h"
- #include <stdbool.h>
- #include <errno.h>
- #include <stdio.h>
- #include <sys/ioctl.h>
- #include <unistd.h>
- #include <sys/socket.h>
- #include <sys/types.h>
- #include <stdlib.h>
- #include <stddef.h>
- #include <net/if.h>
- #include <net/if_dl.h>
- #include <net/if_types.h>
- #include <string.h>
- #include <netdb.h>
- #include <net/if_var.h>
- #include <netinet/in_var.h>
- #include <netinet6/nd6.h>
- #include <netinet/in.h>
- #include <sys/kern_control.h>
- #include <sys/sys_domain.h>
- #include <sys/kern_event.h>
- #include <net/route.h>
- #include <sys/sysctl.h>
- struct Prefix {
- struct sockaddr_storage ss;
- int prefix;
- };
- #define ArrayList_TYPE struct Prefix
- #define ArrayList_NAME OfPrefix
- #include "util/ArrayList.h"
- Assert_compileTime(sizeof(struct in_addr) == 4);
- struct RouteMessage4 {
- struct rt_msghdr header;
- struct sockaddr_in dest;
- struct sockaddr_dl link;
- struct sockaddr_in netmask;
- };
- Assert_compileTime(sizeof(struct rt_msghdr) == 92);
- Assert_compileTime(sizeof(struct sockaddr_in) == 16);
- Assert_compileTime(sizeof(struct sockaddr_dl) == 20);
- Assert_compileTime(sizeof(struct RouteMessage4) == 144);
- static Er_DEFUN(void mkRouteMsg(struct Message* msg,
- struct Prefix* addRoute,
- int ifIndex,
- const char* ifName,
- int seq,
- bool delete))
- {
- if (CString_strlen(ifName) >= 12) {
- Er_raise(Message_getAlloc(msg), "ifName [%s] too long, limit 11 chars", ifName);
- }
- int lengthBegin = Message_getLength(msg);
- bool ipv6 = addRoute->ss.ss_family == AF_INET6;
- if (ipv6) {
- struct sockaddr_in6 mask = {
- .sin6_family = AF_INET6,
- .sin6_len = sizeof(struct sockaddr_in6)
- };
- Bits_memset((void *)&mask.sin6_addr, 0xff, addRoute->prefix >> 3);
- ((uint8_t*)&mask.sin6_addr)[addRoute->prefix >> 3] = 0xff << (8 - (addRoute->prefix % 8));
- Er(Message_epush(msg, &mask, sizeof(struct sockaddr_in6)));
- } else {
- struct sockaddr_in mask = {
- .sin_family = AF_INET,
- .sin_len = sizeof(struct sockaddr_in)
- };
- mask.sin_addr.s_addr = Endian_hostToBigEndian32(~0u << (32 - addRoute->prefix));
- Er(Message_epush(msg, &mask, sizeof(struct sockaddr_in)));
- }
- if (!delete) {
- struct sockaddr_dl link = {
- .sdl_family = AF_LINK,
- .sdl_len = sizeof(struct sockaddr_dl),
- .sdl_type = IFT_OTHER,
- .sdl_index = ifIndex,
- .sdl_nlen = CString_strlen(ifName)
- };
- CString_safeStrncpy(link.sdl_data, ifName, 12);
- Er(Message_epush(msg, &link, sizeof(struct sockaddr_dl)));
- }
- int len = (ipv6) ? sizeof(struct sockaddr_in6) : sizeof(struct sockaddr_in);
- Assert_true(addRoute->ss.ss_len == len);
- Er(Message_epush(msg, &addRoute->ss, len));
- struct rt_msghdr hdr = {
- .rtm_type = (delete) ? RTM_DELETE : RTM_ADD,
- .rtm_flags = RTF_UP | RTF_STATIC,
- .rtm_version = RTM_VERSION,
- .rtm_seq = seq,
- .rtm_pid = getpid(),
- .rtm_addrs = RTA_DST | RTA_NETMASK | ((delete) ? 0 : RTA_GATEWAY),
- .rtm_msglen = sizeof(struct rt_msghdr) + (Message_getLength(msg) - lengthBegin)
- };
- Er(Message_epush(msg, &hdr, sizeof(struct rt_msghdr)));
- Er_ret();
- }
- static Er_DEFUN(void setRoutes(uint32_t ifIndex,
- const char* ifName,
- struct ArrayList_OfPrefix* toRemove,
- struct ArrayList_OfPrefix* toAdd,
- struct Log* logger,
- struct Allocator* alloc))
- {
- int seq = 0;
- int sock = socket(PF_ROUTE, SOCK_RAW, 0);
- if (sock == -1) {
- int err = errno;
- close(sock);
- Er_raise(alloc, "open route socket [%s]", strerror(err));
- }
- bool err = false;
- ssize_t returnLen = 0;
- for (int i = 0; !err && i < toRemove->length; i++) {
- struct Prefix* pfx = ArrayList_OfPrefix_get(toRemove, i);
- struct Message* msg = Message_new(0, 1024, alloc);
- Er(mkRouteMsg(msg, pfx, ifIndex, ifName, seq++, true));
- //printf("DELETE ROUTE %s\n", Hex_print(msg->bytes, Message_getLength(msg), alloc));
- returnLen = write(sock, msg->msgbytes, Message_getLength(msg));
- if (returnLen < Message_getLength(msg)) { err = true; break; }
- }
- for (int i = 0; !err && i < toAdd->length; i++) {
- struct Prefix* pfx = ArrayList_OfPrefix_get(toAdd, i);
- struct Message* msg = Message_new(0, 1024, alloc);
- Er(mkRouteMsg(msg, pfx, ifIndex, ifName, seq++, false));
- //printf("ADD ROUTE %s\n", Hex_print(msg->bytes, Message_getLength(msg), alloc));
- returnLen = write(sock, msg->msgbytes, Message_getLength(msg));
- if (returnLen < Message_getLength(msg)) { err = true; break; }
- }
- if (returnLen < 0) {
- int error = errno;
- close(sock);
- Er_raise(alloc, "setRoutes() [%s]", strerror(error));
- } else if (err) {
- close(sock);
- Er_raise(alloc, "setRoutes() returned short");
- }
- close(sock);
- Er_ret();
- }
- static int prefixFromWeirdBSDMask(uint8_t* weirdBsdMask, bool ipv6)
- {
- uint8_t len = weirdBsdMask[0];
- int out;
- if (ipv6) {
- Assert_true(len >= 8);
- out = (len - 9) * 8;
- } else {
- Assert_true(len >= 4);
- out = (len - 5) * 8;
- }
- for (int i = 1; i < len - 1; i++) {
- Assert_true(weirdBsdMask[i] == 0xff);
- }
- return out + Bits_popCountx32(weirdBsdMask[len - 1]);
- }
- static Er_DEFUN(struct ArrayList_OfPrefix* getRoutes(uint32_t ifIndex,
- struct Log* logger,
- struct Allocator* allocator))
- {
- size_t needed;
- int mib[] = { CTL_NET, PF_ROUTE, 0, 0, NET_RT_DUMP, 0 };
- if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
- Er_raise(allocator, "sysctl(net.route.0.0.dump) estimate");
- }
- struct Allocator* tempAlloc = Allocator_child(allocator);
- uint8_t* buf = Allocator_malloc(tempAlloc, needed);
- if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
- Er_raise(allocator, "sysctl(net.route.0.0.dump)");
- }
- struct ArrayList_OfPrefix* addrList = ArrayList_OfPrefix_new(allocator);
- for (int i = 0; i < (int)needed;) {
- struct rt_msghdr* rtm = (struct rt_msghdr*) (&buf[i]);
- i += rtm->rtm_msglen;
- struct sockaddr* sa1 = (struct sockaddr*)(rtm + 1);
- struct sockaddr* sa2 = (struct sockaddr*)(sa1->sa_len + (char *)sa1);
- uint8_t* mask = (uint8_t*) (sa2->sa_len + (char*)sa2);
- Assert_true(&buf[i] >= mask);
- if (sa2->sa_family != AF_LINK) { continue; }
- if (rtm->rtm_flags & RTF_LOCAL) { continue; }
- if (!(rtm->rtm_flags & RTF_STATIC)) { continue; }
- if (((struct sockaddr_dl*) sa2)->sdl_index != ifIndex) { continue; }
- bool ipv6 = (sa1->sa_family == AF_INET6);
- if (!ipv6 && (sa1->sa_family != AF_INET)) { continue; }
- // printf("GOT ROUTE %s\n", Hex_print(rtm, rtm->rtm_msglen, tempAlloc));
- int prefix;
- if (&buf[i] < &mask[mask[0]] || mask[0] == 0) {
- //Assert_true(rtm->rtm_flags & RTF_HOST);
- prefix = (ipv6) ? 128 : 32;
- } else {
- prefix = prefixFromWeirdBSDMask(mask, ipv6);
- }
- struct Prefix* pfx = Allocator_calloc(allocator, sizeof(struct Prefix), 1);
- Assert_true(sizeof(pfx->ss) >= sa1->sa_len);
- Bits_memcpy(&pfx->ss, sa1, sa1->sa_len);
- pfx->prefix = prefix;
- ArrayList_OfPrefix_add(addrList, pfx);
- }
- Allocator_free(tempAlloc);
- Er_ret(addrList);
- }
- static Er_DEFUN(void addIp4Address(const char* interfaceName,
- const uint8_t address[4],
- int prefixLen,
- struct Log* logger,
- struct Allocator* tempAlloc))
- {
- struct ifaliasreq ifarted;
- Bits_memset(&ifarted, 0, sizeof(struct ifaliasreq));
- CString_safeStrncpy(ifarted.ifra_name, interfaceName, IFNAMSIZ);
- struct sockaddr_in sin = { .sin_family = AF_INET, .sin_len = sizeof(struct sockaddr_in) };
- Bits_memcpy(&sin.sin_addr.s_addr, address, 4);
- Bits_memcpy(&ifarted.ifra_addr, &sin, sizeof(struct sockaddr_in));
- sin.sin_addr.s_addr = Endian_hostToBigEndian32(~0u << (32 - prefixLen));
- Bits_memcpy(&ifarted.ifra_mask, &sin, sizeof(struct sockaddr_in));
- int s = socket(AF_INET, SOCK_DGRAM, 0);
- if (s < 0) {
- Er_raise(tempAlloc, "socket() [%s]", strerror(errno));
- }
- // will probably fail, ignore result.
- struct ifreq ifr = { .ifr_flags = 0 };
- CString_safeStrncpy(ifr.ifr_name, interfaceName, IFNAMSIZ);
- ioctl(s, SIOCDIFADDR, &ifr);
- if (ioctl(s, SIOCSIFADDR, &ifarted) < 0) {
- int err = errno;
- close(s);
- Er_raise(tempAlloc, "ioctl(SIOCSIFADDR) [%s]", strerror(err));
- }
- //setupRoute4(address, prefixLen, interfaceName, logger, tempAlloc, eh);
- Log_info(logger, "Configured IPv4 [%u.%u.%u.%u/%i] for [%s]",
- address[0], address[1], address[2], address[3], prefixLen, interfaceName);
- close(s);
- Er_ret();
- }
- static Er_DEFUN(void addIp6Address(const char* interfaceName,
- const uint8_t address[16],
- int prefixLen,
- struct Log* logger,
- struct Allocator* errAlloc))
- {
- /* stringify our IP address */
- char myIp[40];
- AddrTools_printIp((uint8_t*)myIp, address);
- /* set up the interface ip assignment request */
- struct in6_aliasreq in6_addreq;
- memset(&in6_addreq, 0, sizeof(in6_addreq));
- in6_addreq.ifra_lifetime.ia6t_vltime = ND6_INFINITE_LIFETIME;
- in6_addreq.ifra_lifetime.ia6t_pltime = ND6_INFINITE_LIFETIME;
- /* parse the IPv6 address and add it to the request */
- struct addrinfo hints, *result;
- bzero(&hints, sizeof(struct addrinfo));
- hints.ai_family = AF_INET6;
- int err = getaddrinfo((const char *)myIp, NULL, &hints, &result);
- if (err) {
- // Should never happen since the address is specified as binary.
- Er_raise(errAlloc, "bad IPv6 address [%s]", gai_strerror(err));
- }
- bcopy(result->ai_addr, &in6_addreq.ifra_addr, result->ai_addrlen);
- /* turn the prefixlen into a mask, and add it to the request */
- struct sockaddr_in6* mask = &in6_addreq.ifra_prefixmask;
- mask->sin6_len = sizeof(*mask);
- if (prefixLen >= 128 || prefixLen <= 0) {
- memset(&mask->sin6_addr, 0xff, sizeof(struct in6_addr));
- } else {
- memset((void *)&mask->sin6_addr, 0x00, sizeof(mask->sin6_addr));
- memset((void *)&mask->sin6_addr, 0xff, prefixLen>>3);
- ((uint8_t*)&mask->sin6_addr)[prefixLen>>3] = 0xff << (8 - (prefixLen%8));
- }
- CString_safeStrncpy(in6_addreq.ifra_name, interfaceName, sizeof(in6_addreq.ifra_name));
- /* do the actual assignment ioctl */
- int s = socket(AF_INET6, SOCK_DGRAM, 0);
- if (s < 0) {
- Er_raise(errAlloc, "socket() [%s]", strerror(errno));
- }
- if (ioctl(s, SIOCAIFADDR_IN6, &in6_addreq) < 0) {
- int err = errno;
- close(s);
- Er_raise(errAlloc, "ioctl(SIOCAIFADDR) [%s] for [%s]", strerror(err), interfaceName);
- }
- Log_info(logger, "Configured IPv6 [%s/%i] for [%s]", myIp, prefixLen, interfaceName);
- close(s);
- Er_ret();
- }
- Er_DEFUN(void NetPlatform_addAddress(const char* interfaceName,
- const uint8_t* address,
- int prefixLen,
- int addrFam,
- struct Log* logger,
- struct Allocator* tempAlloc))
- {
- if (addrFam == Sockaddr_AF_INET6) {
- Er(addIp6Address(interfaceName, address, prefixLen, logger, tempAlloc));
- } else if (addrFam == Sockaddr_AF_INET) {
- Er(addIp4Address(interfaceName, address, prefixLen, logger, tempAlloc));
- } else {
- Assert_true(0);
- }
- Er_ret();
- }
- Er_DEFUN(void NetPlatform_setMTU(const char* interfaceName,
- uint32_t mtu,
- struct Log* logger,
- struct Allocator* errAlloc))
- {
- int s = socket(AF_INET6, SOCK_DGRAM, 0);
- if (s < 0) {
- Er_raise(errAlloc, "socket() [%s]", strerror(errno));
- }
- struct ifreq ifRequest;
- CString_safeStrncpy(ifRequest.ifr_name, interfaceName, IFNAMSIZ);
- ifRequest.ifr_mtu = mtu;
- Log_info(logger, "Setting MTU for device [%s] to [%u] bytes.", interfaceName, mtu);
- if (ioctl(s, SIOCSIFMTU, &ifRequest) < 0) {
- int err = errno;
- close(s);
- Er_raise(errAlloc, "ioctl(SIOCSIFMTU) [%s]", strerror(err));
- }
- close(s);
- Er_ret();
- }
- Er_DEFUN(void NetPlatform_setRoutes(const char* ifName,
- struct Sockaddr** prefixSet,
- int prefixCount,
- struct Log* logger,
- struct Allocator* tempAlloc))
- {
- struct ArrayList_OfPrefix* newRoutes = ArrayList_OfPrefix_new(tempAlloc);
- for (int i = 0; i < prefixCount; i++) {
- struct Prefix* pfx = Allocator_calloc(tempAlloc, sizeof(struct Prefix), 1);
- //Sockaddr_getAddress
- int addrFam = Sockaddr_getFamily(prefixSet[i]);
- if (addrFam == Sockaddr_AF_INET) {
- // OK
- struct sockaddr_in* in = (struct sockaddr_in*) &pfx->ss;
- in->sin_family = AF_INET;
- Assert_compileTime(sizeof(in->sin_addr) == 4);
- Assert_true(Sockaddr_getAddress(prefixSet[i], &in->sin_addr) == AF_INET);
- } else if (addrFam == Sockaddr_AF_INET6) {
- // OK
- struct sockaddr_in6* in6 = (struct sockaddr_in6*) &pfx->ss;
- in6->sin6_family = AF_INET6;
- Assert_compileTime(sizeof(in6->sin6_addr) == 16);
- Assert_true(Sockaddr_getAddress(prefixSet[i], &in6->sin6_addr) == AF_INET6);
- } else {
- Er_raise(tempAlloc, "Unrecognized address type %d", addrFam);
- }
- ArrayList_OfPrefix_add(newRoutes, prefixSet[i]);
- }
- uint32_t ifIndex = if_nametoindex(ifName);
- if (!ifIndex) {
- Er_raise(tempAlloc, "tunName not recognized");
- }
- struct ArrayList_OfPrefix* oldRoutes = Er(getRoutes(ifIndex, logger, tempAlloc));
- Er(setRoutes(ifIndex, ifName, oldRoutes, newRoutes, logger, tempAlloc));
- Er_ret();
- }
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