X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=blobdiff_plain;f=src%2Fodhcpd.c;h=8aa4571ea642dc15409f00f235ad8b16900e92c2;hp=f59d5a885f246502cb2fda7b8b7d68076bc99ffe;hb=HEAD;hpb=028ab85da8ef40af43aeb48129ffa32c98503336 diff --git a/src/odhcpd.c b/src/odhcpd.c index f59d5a8..8aa4571 100644 --- a/src/odhcpd.c +++ b/src/odhcpd.c @@ -32,9 +32,6 @@ #include #include #include -#include -#include -#include #include #include @@ -43,16 +40,12 @@ #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 void sighandler(_unused int signal) @@ -60,6 +53,7 @@ static void sighandler(_unused int signal) uloop_end(); } + static void print_usage(const char *app) { printf( @@ -70,6 +64,7 @@ static void print_usage(const char *app) ); } + int main(int argc, char **argv) { openlog("odhcpd", LOG_PERROR | LOG_PID, LOG_DAEMON); @@ -96,11 +91,6 @@ 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 ((urandom_fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC)) < 0) return 4; @@ -108,42 +98,27 @@ int main(int argc, char **argv) signal(SIGINT, sighandler); signal(SIGTERM, sighandler); - if (init_router()) + if (netlink_init()) + return 4; + + if (router_init()) return 4; - if (init_dhcpv6()) + if (dhcpv6_init()) return 4; - if (init_ndp()) + if (ndp_init()) return 4; - if (init_dhcpv4()) +#ifdef DHCPV4_SUPPORT + 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 int odhcpd_get_interface_config(const char *ifname, const char *what) @@ -168,10 +143,12 @@ int odhcpd_get_interface_config(const char *ifname, const char *what) 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; } @@ -212,195 +189,14 @@ 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 (%m)", + ipbuf, iface->ifname); else syslog(LOG_DEBUG, "Sent %li bytes to %s%%%s", (long)sent, ipbuf, iface->ifname); return sent; } -struct addr_info { - int ifindex; - int af; - struct odhcpd_ipaddr **addrs; - 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 odhcpd_ipaddr *addrs = *(ctxt->addrs); - struct nlmsghdr *hdr = nlmsg_hdr(msg); - struct ifaddrmsg *ifa; - struct nlattr *nla[__IFA_MAX], *nla_addr = NULL; - - if (hdr->nlmsg_type != RTM_NEWADDR) - return NL_SKIP; - - ifa = NLMSG_DATA(hdr); - if (ifa->ifa_scope != RT_SCOPE_UNIVERSE || - (ctxt->af != ifa->ifa_family) || - (ctxt->ifindex && ifa->ifa_index != (unsigned)ctxt->ifindex)) - return NL_SKIP; - - nlmsg_parse(hdr, sizeof(*ifa), nla, __IFA_MAX - 1, NULL); - - switch (ifa->ifa_family) { - case AF_INET6: - if (nla[IFA_ADDRESS]) - nla_addr = nla[IFA_ADDRESS]; - break; - - case AF_INET: - if (nla[IFA_LOCAL]) - nla_addr = nla[IFA_LOCAL]; - break; - - default: - break; - } - if (!nla_addr) - return NL_SKIP; - - addrs = realloc(addrs, sizeof(*addrs)*(ctxt->ret + 1)); - if (!addrs) - return NL_SKIP; - - memset(&addrs[ctxt->ret], 0, sizeof(addrs[ctxt->ret])); - addrs[ctxt->ret].prefix = ifa->ifa_prefixlen; - - nla_memcpy(&addrs[ctxt->ret].addr, nla_addr, - sizeof(addrs[ctxt->ret].addr)); - - if (nla[IFA_BROADCAST]) - nla_memcpy(&addrs[ctxt->ret].broadcast, nla[IFA_BROADCAST], - sizeof(addrs[ctxt->ret].broadcast)); - - if (nla[IFA_CACHEINFO]) { - struct ifa_cacheinfo *ifc = nla_data(nla[IFA_CACHEINFO]); - - addrs[ctxt->ret].preferred = ifc->ifa_prefered; - addrs[ctxt->ret].valid = ifc->ifa_valid; - } - - if (ifa->ifa_flags & IFA_F_DEPRECATED) - addrs[ctxt->ret].preferred = 0; - - ctxt->ret++; - *(ctxt->addrs) = addrs; - - 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; -} - -static int prefix_cmp(const void *va, const void *vb) -{ - const struct odhcpd_ipaddr *a = va, *b = vb; - int ret = 0; - - if (a->prefix == b->prefix) { - ret = (ntohl(a->addr.in.s_addr) < ntohl(b->addr.in.s_addr)) ? 1 : - (ntohl(a->addr.in.s_addr) > ntohl(b->addr.in.s_addr)) ? -1 : 0; - } else - ret = a->prefix < b->prefix ? 1 : -1; - - return ret; -} - -// compare IPv6 prefixes -static int prefix6_cmp(const void *va, const void *vb) -{ - const struct odhcpd_ipaddr *a = va, *b = vb; - uint32_t a_pref = IN6_IS_ADDR_ULA(&a->addr.in6) ? 1 : a->preferred; - uint32_t b_pref = IN6_IS_ADDR_ULA(&b->addr.in6) ? 1 : b->preferred; - return (a_pref < b_pref) ? 1 : (a_pref > b_pref) ? -1 : 0; -} - -// Detect an IPV6-address currently assigned to the given interface -ssize_t odhcpd_get_interface_addresses(int ifindex, bool v6, struct odhcpd_ipaddr **addrs) -{ - struct nl_msg *msg; - struct ifaddrmsg ifa = { - .ifa_family = v6? AF_INET6: AF_INET, - .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, - .af = v6? AF_INET6: AF_INET, - .addrs = addrs, - .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); - - if (ctxt.ret <= 0) - goto out; - - time_t now = odhcpd_time(); - struct odhcpd_ipaddr *addr = *addrs; - - qsort(addr, ctxt.ret, sizeof(*addr), v6 ? prefix6_cmp : prefix_cmp); - - for (ssize_t i = 0; i < ctxt.ret; ++i) { - if (addr[i].preferred < UINT32_MAX - now) - addr[i].preferred += now; - - if (addr[i].valid < UINT32_MAX - now) - addr[i].valid += now; - } - -out: - nl_cb_put(cb); - - return ctxt.ret; -} static int odhcpd_get_linklocal_interface_address(int ifindex, struct in6_addr *lladdr) { @@ -432,8 +228,8 @@ int odhcpd_get_interface_dns_addr(const struct interface *iface, struct in6_addr time_t now = odhcpd_time(); ssize_t m = -1; - for (size_t i = 0; i < iface->ia_addr_len; ++i) { - if (iface->ia_addr[i].valid <= (uint32_t)now) + for (size_t i = 0; i < iface->addr6_len; ++i) { + if (iface->addr6[i].valid <= (uint32_t)now) continue; if (m < 0) { @@ -441,168 +237,30 @@ int odhcpd_get_interface_dns_addr(const struct interface *iface, struct in6_addr continue; } - if (iface->ia_addr[m].preferred >= (uint32_t)now && - iface->ia_addr[i].preferred < (uint32_t)now) + if (iface->addr6[m].preferred >= (uint32_t)now && + iface->addr6[i].preferred < (uint32_t)now) continue; - if (IN6_IS_ADDR_ULA(&iface->ia_addr[i].addr.in6)) { - if (!IN6_IS_ADDR_ULA(&iface->ia_addr[m].addr.in6)) { + 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->ia_addr[m].addr.in6)) + } else if (IN6_IS_ADDR_ULA(&iface->addr6[m].addr.in6)) continue; - if (iface->ia_addr[i].preferred > iface->ia_addr[m].preferred) + if (iface->addr6[i].preferred > iface->addr6[m].preferred) m = i; } if (m >= 0) { - *addr = iface->ia_addr[m].addr.in6; + *addr = iface->addr6[m].addr.in6; return 0; } return odhcpd_get_linklocal_interface_address(iface->ifindex, addr); } -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); -} - -int odhcpd_setup_proxy_neigh(const struct in6_addr *addr, - const struct interface *iface, const bool add) -{ - 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; - - if (add) - flags |= NLM_F_REPLACE | NLM_F_CREATE; - - msg = nlmsg_alloc_simple(add ? RTM_NEWNEIGH : RTM_DELNEIGH, flags); - if (!msg) - return -1; - - nlmsg_append(msg, &ndm, sizeof(ndm), 0); - - nla_put(msg, NDA_DST, sizeof(*addr), addr); - - ret = nl_send_auto_complete(rtnl_socket, msg); - nlmsg_free(msg); - - if (ret < 0) - return ret; - - return nl_wait_for_ack(rtnl_socket); -} - -int odhcpd_setup_addr(struct odhcpd_ipaddr *addr, - const struct interface *iface, const bool v6, - const bool add) -{ - struct nl_msg *msg; - struct ifaddrmsg ifa = { - .ifa_family = v6 ? AF_INET6 : AF_INET, - .ifa_prefixlen = addr->prefix, - .ifa_flags = 0, - .ifa_scope = 0, - .ifa_index = iface->ifindex, }; - int ret = 0, flags = NLM_F_REQUEST; - - if (add) - flags |= NLM_F_REPLACE | NLM_F_CREATE; - - msg = nlmsg_alloc_simple(add ? RTM_NEWADDR : RTM_DELADDR, 0); - if (!msg) - return -1; - - nlmsg_append(msg, &ifa, sizeof(ifa), flags); - nla_put(msg, IFA_LOCAL, v6 ? 16 : 4, &addr->addr); - if (v6) { - struct ifa_cacheinfo cinfo = { .ifa_prefered = 0xffffffffU, - .ifa_valid = 0xffffffffU, - .cstamp = 0, - .tstamp = 0 }; - time_t now = odhcpd_time(); - - if (addr->preferred) { - int64_t preferred = addr->preferred - now; - if (preferred < 0) - preferred = 0; - else if (preferred > UINT32_MAX) - preferred = UINT32_MAX; - - cinfo.ifa_prefered = preferred; - } - - if (addr->valid) { - int64_t valid = addr->valid - now; - if (valid <= 0) { - nlmsg_free(msg); - return -1; - } - else if (valid > UINT32_MAX) - valid = UINT32_MAX; - - cinfo.ifa_valid = valid; - } - - nla_put(msg, IFA_CACHEINFO, sizeof(cinfo), &cinfo); - - nla_put_u32(msg, IFA_FLAGS, IFA_F_NOPREFIXROUTE); - } else { - if (addr->broadcast.s_addr) - nla_put_u32(msg, IFA_BROADCAST, addr->broadcast.s_addr); - } - - ret = nl_send_auto_complete(rtnl_socket, msg); - nlmsg_free(msg); - - if (ret < 0) - return ret; - - return nl_wait_for_ack(rtnl_socket); -} - struct interface* odhcpd_get_interface_by_index(int ifindex) { struct interface *iface; @@ -715,12 +373,6 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even 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)) @@ -730,10 +382,26 @@ 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 %li Bytes from %s%%%s", (long)len, + ipbuf, "netlink"); + e->handle_dgram(&addr, data_buf, len, NULL, dest); + return; + } else if (destiface != 0) { + struct interface *iface; + list_for_each_entry(iface, &interfaces, head) { + if (iface->ifindex != destiface) + continue; + + syslog(LOG_DEBUG, "Received %li Bytes from %s%%%s", (long)len, + ipbuf, iface->ifname); + + e->handle_dgram(&addr, data_buf, len, iface, dest); + } + } + - e->handle_dgram(&addr, data_buf, len, iface, dest); } } @@ -810,6 +478,16 @@ 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) {