X-Git-Url: http://git.archive.openwrt.org/?p=project%2Fodhcpd.git;a=blobdiff_plain;f=src%2Fodhcpd.c;h=5f871518e218e2f875202876c4e43891842d6202;hp=6f38d5c1c06117aa182ea9862234ba76cff6e24e;hb=24cdc1b59f00a065dd1cf0a04145ca6aaf6f23f1;hpb=18df6cca092743a07be8e0f05d0a9ef941957b66 diff --git a/src/odhcpd.c b/src/odhcpd.c index 6f38d5c..5f87151 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 +98,25 @@ 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()) + if (dhcpv4_init()) return 4; 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) @@ -220,154 +193,6 @@ ssize_t odhcpd_send(int socket, struct sockaddr_in6 *dest, 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]; - - 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); - if (!nla[IFA_ADDRESS]) - 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[IFA_ADDRESS], - sizeof(addrs[ctxt->ret].addr)); - - 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; -} - -// compare prefixes -static int prefixcmp(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), prefixcmp); - - 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) { @@ -432,76 +257,6 @@ int odhcpd_get_interface_dns_addr(const struct interface *iface, struct in6_addr 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); -} - struct interface* odhcpd_get_interface_by_index(int ifindex) { struct interface *iface; @@ -540,7 +295,7 @@ static void odhcpd_receive_packets(struct uloop_fd *u, _unused unsigned int even { 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; @@ -738,3 +493,54 @@ 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; +}