X-Git-Url: http://git.openwrt.org/?a=blobdiff_plain;f=src%2Fodhcpd.c;h=fafa3f68642781e82fcfeb459c443fe14ad81a90;hb=e7b1d4bf3a2297192638b9c84208b3dcb306ecd8;hp=9a76e4d638ee54b3a0ffcd4592c6b383479e126e;hpb=51c756cfc15c63322df9fdb70d5c701cfb6b9a9f;p=project%2Fodhcpd.git diff --git a/src/odhcpd.c b/src/odhcpd.c index 9a76e4d..fafa3f6 100644 --- a/src/odhcpd.c +++ b/src/odhcpd.c @@ -24,15 +24,14 @@ #include #include #include +#include +#include #include #include #include #include #include -#include -#include -#include #include #include @@ -41,18 +40,13 @@ #include #include -#include -#include -#include #include #include "odhcpd.h" static int ioctl_sock; -static struct nl_sock *rtnl_socket = NULL; static int urandom_fd = -1; -static int log_level = LOG_INFO; static void sighandler(_unused int signal) { @@ -65,10 +59,22 @@ static void print_usage(const char *app) "== %s Usage ==\n\n" " -h, --help Print this help\n" " -l level Specify log level 0..7 (default %d)\n", - app, log_level + app, config.log_level ); } +static bool ipv6_enabled(void) +{ + int fd = socket(AF_INET6, SOCK_DGRAM, 0); + + if (fd < 0) + return false; + + close(fd); + + return true; +} + int main(int argc, char **argv) { openlog("odhcpd", LOG_PERROR | LOG_PID, LOG_DAEMON); @@ -80,12 +86,12 @@ int main(int argc, char **argv) print_usage(argv[0]); return 0; case 'l': - log_level = atoi(optarg); - fprintf(stderr, "Log level set to %d\n", log_level); + config.log_level = (atoi(optarg) & LOG_PRIMASK); + fprintf(stderr, "Log level set to %d\n", config.log_level); break; } } - setlogmask(LOG_UPTO(log_level)); + setlogmask(LOG_UPTO(config.log_level)); uloop_init(); if (getuid() != 0) { @@ -95,10 +101,8 @@ int main(int argc, char **argv) ioctl_sock = socket(AF_INET, SOCK_DGRAM | SOCK_CLOEXEC, 0); - if (!(rtnl_socket = odhcpd_create_nl_socket(NETLINK_ROUTE))) { - syslog(LOG_ERR, "Unable to open nl socket: %s", strerror(errno)); - return 2; - } + if (ioctl_sock < 0) + return 4; if ((urandom_fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC)) < 0) return 4; @@ -107,44 +111,33 @@ int main(int argc, char **argv) signal(SIGINT, sighandler); signal(SIGTERM, sighandler); - if (init_router()) + if (netlink_init()) return 4; - if (init_dhcpv6()) - return 4; + if (ipv6_enabled()) { + if (router_init()) + return 4; - if (init_ndp()) - return 4; + if (dhcpv6_init()) + return 4; - if (init_dhcpv4()) + if (ndp_init()) + return 4; + } +#ifndef DHCPV4_SUPPORT + else + return 4; +#else + if (dhcpv4_init()) return 4; +#endif odhcpd_run(); return 0; } -struct nl_sock *odhcpd_create_nl_socket(int protocol) -{ - struct nl_sock *nl_sock; - - nl_sock = nl_socket_alloc(); - if (!nl_sock) - goto err; - - if (nl_connect(nl_sock, protocol) < 0) - goto err; - - return nl_sock; - -err: - if (nl_sock) - nl_socket_free(nl_sock); - - return NULL; -} - -// Read IPv6 MTU for interface +/* Read IPv6 MTU for interface */ int odhcpd_get_interface_config(const char *ifname, const char *what) { char buf[64]; @@ -152,6 +145,9 @@ int odhcpd_get_interface_config(const char *ifname, const char *what) snprintf(buf, sizeof(buf), sysctl_pattern, ifname, what); int fd = open(buf, O_RDONLY); + if (fd < 0) + return -1; + ssize_t len = read(fd, buf, sizeof(buf) - 1); close(fd); @@ -163,25 +159,27 @@ int odhcpd_get_interface_config(const char *ifname, const char *what) } -// Read IPv6 MAC for interface +/* Read IPv6 MAC for interface */ int odhcpd_get_mac(const struct interface *iface, uint8_t mac[6]) { struct ifreq ifr; + memset(&ifr, 0, sizeof(ifr)); - strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name)); + strncpy(ifr.ifr_name, iface->ifname, sizeof(ifr.ifr_name) - 1); if (ioctl(ioctl_sock, SIOCGIFHWADDR, &ifr) < 0) return -1; + memcpy(mac, ifr.ifr_hwaddr.sa_data, 6); return 0; } -// Forwards a packet on a specific interface +/* Forwards a packet on a specific interface */ ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest, struct iovec *iov, size_t iov_len, const struct interface *iface) { - // Construct headers + /* Construct headers */ uint8_t cmsg_buf[CMSG_SPACE(sizeof(struct in6_pktinfo))] = {0}; struct msghdr msg = { .msg_name = (void *) dest, @@ -193,7 +191,7 @@ ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest, .msg_flags = 0 }; - // Set control data (define destination interface) + /* Set control data (define destination interface) */ struct cmsghdr *chdr = CMSG_FIRSTHDR(&msg); chdr->cmsg_level = IPPROTO_IPV6; chdr->cmsg_type = IPV6_PKTINFO; @@ -201,7 +199,7 @@ ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest, struct in6_pktinfo *pktinfo = (struct in6_pktinfo*)CMSG_DATA(chdr); pktinfo->ipi6_ifindex = iface->ifindex; - // Also set scope ID if link-local + /* Also set scope ID if link-local */ if (IN6_IS_ADDR_LINKLOCAL(&dest->sin6_addr) || IN6_IS_ADDR_MC_LINKLOCAL(&dest->sin6_addr)) dest->sin6_scope_id = iface->ifindex; @@ -211,258 +209,116 @@ ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest, ssize_t sent = sendmsg(socket, &msg, MSG_DONTWAIT); if (sent < 0) - syslog(LOG_NOTICE, "Failed to send to %s%%%s (%s)", - ipbuf, iface->ifname, strerror(errno)); + syslog(LOG_NOTICE, "Failed to send to %s%%%s@%s (%m)", + ipbuf, iface->name, iface->ifname); else - syslog(LOG_DEBUG, "Sent %li bytes to %s%%%s", - (long)sent, ipbuf, iface->ifname); + syslog(LOG_DEBUG, "Sent %zd bytes to %s%%%s@%s", + sent, ipbuf, iface->name, iface->ifname); return sent; } -struct addr_info { - int ifindex; - struct odhcpd_ipaddr *addrs; - size_t addrs_sz; - int pending; - ssize_t ret; -}; - -static int cb_valid_handler(struct nl_msg *msg, void *arg) -{ - struct addr_info *ctxt = (struct addr_info *)arg; - struct nlmsghdr *hdr = nlmsg_hdr(msg); - struct ifaddrmsg *ifa; - struct nlattr *nla[__IFA_MAX]; - - if (hdr->nlmsg_type != RTM_NEWADDR || ctxt->ret >= (ssize_t)ctxt->addrs_sz) - return NL_SKIP; - - ifa = NLMSG_DATA(hdr); - if (ifa->ifa_scope != RT_SCOPE_UNIVERSE || - (ctxt->ifindex && ifa->ifa_index != (unsigned)ctxt->ifindex)) - return NL_SKIP; - - nlmsg_parse(hdr, sizeof(*ifa), nla, __IFA_MAX - 1, NULL); - if (!nla[IFA_ADDRESS]) - return NL_SKIP; - - memset(&ctxt->addrs[ctxt->ret], 0, sizeof(ctxt->addrs[ctxt->ret])); - ctxt->addrs[ctxt->ret].prefix = ifa->ifa_prefixlen; - - nla_memcpy(&ctxt->addrs[ctxt->ret].addr, nla[IFA_ADDRESS], - sizeof(ctxt->addrs[ctxt->ret].addr)); - - if (nla[IFA_CACHEINFO]) { - struct ifa_cacheinfo *ifc = nla_data(nla[IFA_CACHEINFO]); - - ctxt->addrs[ctxt->ret].preferred = ifc->ifa_prefered; - ctxt->addrs[ctxt->ret].valid = ifc->ifa_valid; - } - - if (ifa->ifa_flags & IFA_F_DEPRECATED) - ctxt->addrs[ctxt->ret].preferred = 0; - - ctxt->ret++; - - return NL_OK; -} - -static int cb_finish_handler(_unused struct nl_msg *msg, void *arg) -{ - struct addr_info *ctxt = (struct addr_info *)arg; - - ctxt->pending = 0; - - return NL_STOP; -} - -static int cb_error_handler(_unused struct sockaddr_nl *nla, struct nlmsgerr *err, - void *arg) -{ - struct addr_info *ctxt = (struct addr_info *)arg; - - ctxt->pending = 0; - ctxt->ret = err->error; - - return NL_STOP; -} - -// Detect an IPV6-address currently assigned to the given interface -ssize_t odhcpd_get_interface_addresses(int ifindex, - struct odhcpd_ipaddr *addrs, size_t cnt) -{ - struct nl_msg *msg; - struct ifaddrmsg ifa = { - .ifa_family = AF_INET6, - .ifa_prefixlen = 0, - .ifa_flags = 0, - .ifa_scope = 0, - .ifa_index = ifindex, }; - struct nl_cb *cb = nl_cb_alloc(NL_CB_DEFAULT); - struct addr_info ctxt = { - .ifindex = ifindex, - .addrs = addrs, - .addrs_sz = cnt, - .ret = 0, - .pending = 1, - }; - - if (!cb) { - ctxt.ret = -1; - goto out; - } - - msg = nlmsg_alloc_simple(RTM_GETADDR, NLM_F_REQUEST | NLM_F_DUMP); - - if (!msg) { - ctxt.ret = - 1; - goto out; - } - - nlmsg_append(msg, &ifa, sizeof(ifa), 0); - - nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, cb_valid_handler, &ctxt); - nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, cb_finish_handler, &ctxt); - nl_cb_err(cb, NL_CB_CUSTOM, cb_error_handler, &ctxt); - - nl_send_auto_complete(rtnl_socket, msg); - while (ctxt.pending > 0) - nl_recvmsgs(rtnl_socket, cb); - - nlmsg_free(msg); -out: - nl_cb_put(cb); - - return ctxt.ret; -} -int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr) +static int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr) { - int status = -1; - struct sockaddr_in6 addr = {AF_INET6, 0, 0, ALL_IPV6_ROUTERS, ifindex}; + int ret = -1; + struct sockaddr_in6 addr; socklen_t alen = sizeof(addr); int sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); + if (sock < 0) + return -1; + + memset(&addr, 0, sizeof(addr)); + addr.sin6_family = AF_INET6; + inet_pton(AF_INET6, ALL_IPV6_ROUTERS, &addr.sin6_addr); + addr.sin6_scope_id = ifindex; + if (!connect(sock, (struct sockaddr*)&addr, sizeof(addr)) && !getsockname(sock, (struct sockaddr*)&addr, &alen)) { *lladdr = addr.sin6_addr; - status = 0; + ret = 0; } close(sock); - - return status; -} - -int odhcpd_setup_route(const struct in6_addr *addr, const int prefixlen, - const struct interface *iface, const struct in6_addr *gw, - const uint32_t metric, const bool add) -{ - struct nl_msg *msg; - struct rtmsg rtm = { - .rtm_family = AF_INET6, - .rtm_dst_len = prefixlen, - .rtm_src_len = 0, - .rtm_table = RT_TABLE_MAIN, - .rtm_protocol = (add ? RTPROT_STATIC : RTPROT_UNSPEC), - .rtm_scope = (add ? (gw ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK) : RT_SCOPE_NOWHERE), - .rtm_type = (add ? RTN_UNICAST : RTN_UNSPEC), - }; - int ret = 0; - - msg = nlmsg_alloc_simple(add ? RTM_NEWROUTE : RTM_DELROUTE, - add ? NLM_F_CREATE | NLM_F_REPLACE : 0); - if (!msg) - return -1; - - nlmsg_append(msg, &rtm, sizeof(rtm), 0); - - nla_put(msg, RTA_DST, sizeof(*addr), addr); - nla_put_u32(msg, RTA_OIF, iface->ifindex); - nla_put_u32(msg, RTA_PRIORITY, metric); - - if (gw) - nla_put(msg, RTA_GATEWAY, sizeof(*gw), gw); - - ret = nl_send_auto_complete(rtnl_socket, msg); - nlmsg_free(msg); - - if (ret < 0) - return ret; - - return nl_wait_for_ack(rtnl_socket); + return ret; } -int odhcpd_setup_proxy_neigh(const struct in6_addr *addr, - const struct interface *iface, const bool add) +/* + * DNS address selection criteria order : + * - use IPv6 address with valid lifetime if none is yet selected + * - use IPv6 address with a preferred lifetime if the already selected IPv6 address is deprecated + * - use an IPv6 ULA address if the already selected IPv6 address is not an ULA address + * - use the IPv6 address with the longest preferred lifetime + */ +int odhcpd_get_interface_dns_addr(const struct interface *iface, struct in6_addr *addr) { - struct nl_msg *msg; - struct ndmsg ndm = { - .ndm_family = AF_INET6, - .ndm_flags = NTF_PROXY, - .ndm_ifindex = iface->ifindex, - }; - int ret = 0, flags = NLM_F_REQUEST; + time_t now = odhcpd_time(); + ssize_t m = -1; - if (add) - flags |= NLM_F_REPLACE | NLM_F_CREATE; + for (size_t i = 0; i < iface->addr6_len; ++i) { + if (iface->addr6[i].valid <= (uint32_t)now) + continue; - msg = nlmsg_alloc_simple(add ? RTM_NEWNEIGH : RTM_DELNEIGH, flags); - if (!msg) - return -1; + if (m < 0) { + m = i; + continue; + } - nlmsg_append(msg, &ndm, sizeof(ndm), 0); + if (iface->addr6[m].preferred >= (uint32_t)now && + iface->addr6[i].preferred < (uint32_t)now) + continue; - nla_put(msg, NDA_DST, sizeof(*addr), addr); + if (IN6_IS_ADDR_ULA(&iface->addr6[i].addr.in6)) { + if (!IN6_IS_ADDR_ULA(&iface->addr6[m].addr.in6)) { + m = i; + continue; + } + } else if (IN6_IS_ADDR_ULA(&iface->addr6[m].addr.in6)) + continue; - ret = nl_send_auto_complete(rtnl_socket, msg); - nlmsg_free(msg); + if (iface->addr6[i].preferred > iface->addr6[m].preferred) + m = i; + } - if (ret < 0) - return ret; + if (m >= 0) { + *addr = iface->addr6[m].addr.in6; + return 0; + } - return nl_wait_for_ack(rtnl_socket); + return odhcpd_get_linklocal_interface_address(iface->ifindex, addr); } struct interface* odhcpd_get_interface_by_index(int ifindex) { struct interface *iface; - list_for_each_entry(iface, &interfaces, head) - if (iface->ifindex == ifindex) - return iface; - - return NULL; -} - -struct interface* odhcpd_get_interface_by_name(const char *name) -{ - struct interface *iface; - list_for_each_entry(iface, &interfaces, head) - if (!strcmp(iface->ifname, name)) + avl_for_each_element(&interfaces, iface, avl) { + if (iface->ifindex == ifindex) return iface; + } return NULL; } - struct interface* odhcpd_get_master_interface(void) { struct interface *iface; - list_for_each_entry(iface, &interfaces, head) + + avl_for_each_element(&interfaces, iface, avl) { if (iface->master) return iface; + } return NULL; } -// Convenience function to receive and do basic validation of packets +/* Convenience function to receive and do basic validation of packets */ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int events) { struct odhcpd_event *e = container_of(u, struct odhcpd_event, uloop); - uint8_t data_buf[RELAYD_BUFFER_SIZE], cmsg_buf[128]; + uint8_t data_buf[8192], cmsg_buf[128]; union { struct sockaddr_in6 in6; struct sockaddr_in in; @@ -473,9 +329,9 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even if (u->error) { int ret = -1; socklen_t ret_len = sizeof(ret); - getsockopt(u->fd, SOL_SOCKET, SO_ERROR, &ret, &ret_len); + u->error = false; - if (e->handle_error) + if (e->handle_error && getsockopt(u->fd, SOL_SOCKET, SO_ERROR, &ret, &ret_len) == 0) e->handle_error(e, ret); } @@ -505,7 +361,7 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even } - // Extract destination interface + /* Extract destination interface */ int destiface = 0; int *hlim = NULL; void *dest = NULL; @@ -528,20 +384,14 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even } } - // Check hoplimit if received + /* Check hoplimit if received */ if (hlim && *hlim != 255) continue; - // Detect interface for packet sockets + /* Detect interface for packet sockets */ if (addr.ll.sll_family == AF_PACKET) destiface = addr.ll.sll_ifindex; - struct interface *iface = - odhcpd_get_interface_by_index(destiface); - - if (!iface && addr.nl.nl_family != AF_NETLINK) - continue; - char ipbuf[INET6_ADDRSTRLEN] = "kernel"; if (addr.ll.sll_family == AF_PACKET && len >= (ssize_t)sizeof(struct ip6_hdr)) @@ -551,14 +401,31 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even else if (addr.in.sin_family == AF_INET) inet_ntop(AF_INET, &addr.in.sin_addr, ipbuf, sizeof(ipbuf)); - syslog(LOG_DEBUG, "Received %li Bytes from %s%%%s", (long)len, - ipbuf, (iface) ? iface->ifname : "netlink"); + /* From netlink */ + if (addr.nl.nl_family == AF_NETLINK) { + syslog(LOG_DEBUG, "Received %zd Bytes from %s%%netlink", len, + ipbuf); + e->handle_dgram(&addr, data_buf, len, NULL, dest); + return; + } else if (destiface != 0) { + struct interface *iface; + + avl_for_each_element(&interfaces, iface, avl) { + if (iface->ifindex != destiface) + continue; + + syslog(LOG_DEBUG, "Received %zd Bytes from %s%%%s@%s", len, + ipbuf, iface->name, iface->ifname); + + e->handle_dgram(&addr, data_buf, len, iface, dest); + } + } + - e->handle_dgram(&addr, data_buf, len, iface, dest); } } -// Register events for the multiplexer +/* Register events for the multiplexer */ int odhcpd_register(struct odhcpd_event *event) { event->uloop.cb = odhcpd_receive_packets; @@ -631,6 +498,16 @@ void odhcpd_hexlify(char *dst, const uint8_t *src, size_t len) *dst = 0; } +const char *odhcpd_print_mac(const uint8_t *mac, const size_t len) +{ + static char buf[32]; + + snprintf(buf, sizeof(buf), "%02x", mac[0]); + for (size_t i = 1, j = 2; i < len && j < sizeof(buf); i++, j += 3) + snprintf(buf + j, sizeof(buf) - j, ":%02x", mac[i]); + + return buf; +} int odhcpd_bmemcmp(const void *av, const void *bv, size_t bits) { @@ -660,3 +537,89 @@ void odhcpd_bmemcpy(void *av, const void *bv, size_t bits) a[bytes] = (a[bytes] & mask) | ((~mask) & b[bytes]); } } + + +int odhcpd_netmask2bitlen(bool inet6, void *mask) +{ + int bits; + struct in_addr *v4; + struct in6_addr *v6; + + if (inet6) + for (bits = 0, v6 = mask; + bits < 128 && (v6->s6_addr[bits / 8] << (bits % 8)) & 128; + bits++); + else + for (bits = 0, v4 = mask; + bits < 32 && (ntohl(v4->s_addr) << bits) & 0x80000000; + bits++); + + return bits; +} + +bool odhcpd_bitlen2netmask(bool inet6, unsigned int bits, void *mask) +{ + uint8_t b; + struct in_addr *v4; + struct in6_addr *v6; + + if (inet6) + { + if (bits > 128) + return false; + + v6 = mask; + + for (unsigned int i = 0; i < sizeof(v6->s6_addr); i++) + { + b = (bits > 8) ? 8 : bits; + v6->s6_addr[i] = (uint8_t)(0xFF << (8 - b)); + bits -= b; + } + } + else + { + if (bits > 32) + return false; + + v4 = mask; + v4->s_addr = bits ? htonl(~((1 << (32 - bits)) - 1)) : 0; + } + + return true; +} + +bool odhcpd_valid_hostname(const char *name) +{ +#define MAX_LABEL 63 + const char *c, *label, *label_end; + int label_sz = 0; + + for (c = name, label_sz = 0, label = name, label_end = name + strcspn(name, ".") - 1; + *c && label_sz <= MAX_LABEL; c++) { + if ((*c >= '0' && *c <= '9') || + (*c >= 'A' && *c <= 'Z') || + (*c >= 'a' && *c <= 'z')) { + label_sz++; + continue; + } + + if ((*c == '_' || *c == '-') && c != label && c != label_end) { + label_sz++; + continue; + } + + if (*c == '.') { + if (*(c + 1)) { + label = c + 1; + label_end = label + strcspn(label, ".") - 1; + label_sz = 0; + } + continue; + } + + return false; + } + + return (label_sz && label_sz <= MAX_LABEL ? true : false); +}