/* * Ouroboros - Copyright (C) 2016 - 2018 * * IPC process over Ethernet with LLC * * Dimitri Staessens <dimitri.staessens@ugent.be> * Sander Vrijders <sander.vrijders@ugent.be> * * 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., http://www.fsf.org/about/contact/. */ #if defined(__APPLE__) #define _BSD_SOURCE #define _DARWIN_C_SOURCE #elif defined(__FreeBSD__) #define __BSD_VISIBLE 1 #else #define _POSIX_C_SOURCE 200112L #endif #include "config.h" #define OUROBOROS_PREFIX "ipcpd/eth-llc" #include <ouroboros/hash.h> #include <ouroboros/errno.h> #include <ouroboros/list.h> #include <ouroboros/utils.h> #include <ouroboros/bitmap.h> #include <ouroboros/dev.h> #include <ouroboros/ipcp-dev.h> #include <ouroboros/fqueue.h> #include <ouroboros/logs.h> #include <ouroboros/time_utils.h> #include <ouroboros/fccntl.h> #include "ipcp.h" #include "shim-data.h" #include <signal.h> #include <stdlib.h> #include <pthread.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <sys/socket.h> #include <sys/types.h> #include <sys/ioctl.h> #include <net/if.h> #include <netinet/in.h> #ifdef __linux__ #include <linux/if_packet.h> #include <linux/if_ether.h> #include <linux/netlink.h> #include <linux/rtnetlink.h> #endif #ifdef __FreeBSD__ #include <net/if_dl.h> #include <netinet/if_ether.h> #include <ifaddrs.h> #endif #ifdef __APPLE__ #include <net/if_dl.h> #include <ifaddrs.h> #endif #include <poll.h> #include <sys/mman.h> #if defined(HAVE_NETMAP) #define NETMAP_WITH_LIBS #include <net/netmap_user.h> #elif defined(HAVE_BPF) #define BPF_DEV_MAX 256 #define BPF_BLEN sysconf(_SC_PAGESIZE) #include <net/bpf.h> #endif #define THIS_TYPE IPCP_ETH_LLC #define MGMT_SAP 0x01 #define MAC_SIZE 6 #define LLC_HEADER_SIZE 3 #define MAX_SAPS 64 #define ETH_HEADER_SIZE (2 * MAC_SIZE + 2) #define ETH_FRAME_SIZE (ETH_HEADER_SIZE + LLC_HEADER_SIZE \ + SHIM_ETH_LLC_MAX_SDU_SIZE) #define SHIM_ETH_LLC_MAX_SDU_SIZE (1500 - LLC_HEADER_SIZE) #define ALLOC_TIMEO 10 /* ms */ #define NAME_QUERY_TIMEO 2000 /* ms */ #define MGMT_TIMEO 100 /* ms */ #define FLOW_REQ 0 #define FLOW_REPLY 1 #define NAME_QUERY_REQ 2 #define NAME_QUERY_REPLY 3 struct mgmt_msg { uint8_t code; uint8_t ssap; uint8_t dsap; uint8_t qoscube; int8_t response; } __attribute__((packed)); struct eth_llc_frame { uint8_t dst_hwaddr[MAC_SIZE]; uint8_t src_hwaddr[MAC_SIZE]; uint8_t length[2]; uint8_t dsap; uint8_t ssap; uint8_t cf; uint8_t payload; } __attribute__((packed)); struct ef { int8_t sap; int8_t r_sap; uint8_t r_addr[MAC_SIZE]; }; struct mgmt_frame { struct list_head next; uint8_t r_addr[MAC_SIZE]; uint8_t buf[ETH_FRAME_SIZE]; size_t len; }; struct { struct shim_data * shim_data; #if defined(HAVE_NETMAP) struct nm_desc * nmd; uint8_t hw_addr[MAC_SIZE]; struct pollfd poll_in; struct pollfd poll_out; #elif defined(HAVE_BPF) int bpf; uint8_t hw_addr[MAC_SIZE]; #elif defined(HAVE_RAW_SOCKETS) int s_fd; struct sockaddr_ll device; #endif /* HAVE_NETMAP */ struct bmp * saps; fset_t * np1_flows; fqueue_t * fq; int * ef_to_fd; struct ef * fd_to_ef; pthread_rwlock_t flows_lock; pthread_t sdu_writer; pthread_t sdu_reader; #ifdef __linux__ pthread_t if_monitor; #endif /* Handle mgmt frames in a different thread */ pthread_t mgmt_handler; pthread_mutex_t mgmt_lock; pthread_cond_t mgmt_cond; struct list_head mgmt_frames; } eth_llc_data; static int eth_llc_data_init(void) { int i; int ret = -ENOMEM; pthread_condattr_t cattr; eth_llc_data.fd_to_ef = malloc(sizeof(*eth_llc_data.fd_to_ef) * SYS_MAX_FLOWS); if (eth_llc_data.fd_to_ef == NULL) goto fail_fd_to_ef; eth_llc_data.ef_to_fd = malloc(sizeof(*eth_llc_data.ef_to_fd) * MAX_SAPS); if (eth_llc_data.ef_to_fd == NULL) goto fail_ef_to_fd; eth_llc_data.saps = bmp_create(MAX_SAPS, 2); if (eth_llc_data.saps == NULL) goto fail_saps; eth_llc_data.np1_flows = fset_create(); if (eth_llc_data.np1_flows == NULL) goto fail_np1_flows; eth_llc_data.fq = fqueue_create(); if (eth_llc_data.fq == NULL) goto fail_fq; for (i = 0; i < MAX_SAPS; ++i) eth_llc_data.ef_to_fd[i] = -1; for (i = 0; i < SYS_MAX_FLOWS; ++i) { eth_llc_data.fd_to_ef[i].sap = -1; eth_llc_data.fd_to_ef[i].r_sap = -1; memset(ð_llc_data.fd_to_ef[i].r_addr, 0, MAC_SIZE); } eth_llc_data.shim_data = shim_data_create(); if (eth_llc_data.shim_data == NULL) goto fail_shim_data; ret = -1; if (pthread_rwlock_init(ð_llc_data.flows_lock, NULL)) goto fail_flows_lock; if (pthread_mutex_init(ð_llc_data.mgmt_lock, NULL)) goto fail_mgmt_lock; if (pthread_condattr_init(&cattr)) goto fail_condattr; #ifndef __APPLE__ pthread_condattr_setclock(&cattr, PTHREAD_COND_CLOCK); #endif if (pthread_cond_init(ð_llc_data.mgmt_cond, &cattr)) goto fail_mgmt_cond; pthread_condattr_destroy(&cattr); list_head_init(ð_llc_data.mgmt_frames); return 0; fail_mgmt_cond: pthread_condattr_destroy(&cattr); fail_condattr: pthread_mutex_destroy(ð_llc_data.mgmt_lock); fail_mgmt_lock: pthread_rwlock_destroy(ð_llc_data.flows_lock); fail_flows_lock: shim_data_destroy(eth_llc_data.shim_data); fail_shim_data: fqueue_destroy(eth_llc_data.fq); fail_fq: fset_destroy(eth_llc_data.np1_flows); fail_np1_flows: bmp_destroy(eth_llc_data.saps); fail_saps: free(eth_llc_data.ef_to_fd); fail_ef_to_fd: free(eth_llc_data.fd_to_ef); fail_fd_to_ef: return ret; } static void eth_llc_data_fini(void) { #if defined(HAVE_NETMAP) nm_close(eth_llc_data.nmd); #elif defined(HAVE_BPF) close(eth_llc_data.bpf); #elif defined(HAVE_RAW_SOCKETS) close(eth_llc_data.s_fd); #endif pthread_cond_destroy(ð_llc_data.mgmt_cond); pthread_mutex_destroy(ð_llc_data.mgmt_lock); pthread_rwlock_destroy(ð_llc_data.flows_lock); shim_data_destroy(eth_llc_data.shim_data); fqueue_destroy(eth_llc_data.fq); fset_destroy(eth_llc_data.np1_flows); bmp_destroy(eth_llc_data.saps); free(eth_llc_data.fd_to_ef); free(eth_llc_data.ef_to_fd); } static uint8_t reverse_bits(uint8_t b) { b = (b & 0xF0) >> 4 | (b & 0x0F) << 4; b = (b & 0xCC) >> 2 | (b & 0x33) << 2; b = (b & 0xAA) >> 1 | (b & 0x55) << 1; return b; } static int eth_llc_ipcp_send_frame(const uint8_t * dst_addr, uint8_t dsap, uint8_t ssap, const uint8_t * payload, size_t len) { uint32_t frame_len = 0; uint8_t cf = 0x03; uint16_t length; uint8_t frame[SHIM_ETH_LLC_MAX_SDU_SIZE]; struct eth_llc_frame * llc_frame; if (payload == NULL) { log_err("Payload was NULL."); return -1; } if (len > SHIM_ETH_LLC_MAX_SDU_SIZE) return -1; llc_frame = (struct eth_llc_frame *) frame; memcpy(llc_frame->dst_hwaddr, dst_addr, MAC_SIZE); memcpy(llc_frame->src_hwaddr, #if defined(HAVE_NETMAP) || defined(HAVE_BPF) eth_llc_data.hw_addr, #elif defined(HAVE_RAW_SOCKETS) eth_llc_data.device.sll_addr, #endif /* HAVE_NETMAP */ MAC_SIZE); length = htons(LLC_HEADER_SIZE + len); memcpy(&llc_frame->length, &length, sizeof(length)); llc_frame->dsap = dsap; llc_frame->ssap = ssap; llc_frame->cf = cf; memcpy(&llc_frame->payload, payload, len); frame_len = ETH_HEADER_SIZE + LLC_HEADER_SIZE + len; #if defined(HAVE_NETMAP) if (poll(ð_llc_data.poll_out, 1, -1) < 0) return -1; if (nm_inject(eth_llc_data.nmd, frame, frame_len) != (int) frame_len) { log_dbg("Failed to send message."); return -1; } #elif defined(HAVE_BPF) if (write(eth_llc_data.bpf, frame, frame_len) < 0) { log_dbg("Failed to send message."); return -1; } #elif defined(HAVE_RAW_SOCKETS) if (sendto(eth_llc_data.s_fd, frame, frame_len, 0, (struct sockaddr *) ð_llc_data.device, sizeof(eth_llc_data.device)) <= 0) { log_dbg("Failed to send message."); return -1; } #endif /* HAVE_NETMAP */ return 0; } static int eth_llc_ipcp_sap_alloc(const uint8_t * dst_addr, uint8_t ssap, const uint8_t * hash, qoscube_t cube) { uint8_t * buf; struct mgmt_msg * msg; size_t len; int ret; len = sizeof(*msg) + ipcp_dir_hash_len(); buf = malloc(len); if (buf == NULL) return -1; msg = (struct mgmt_msg *) buf; msg->code = FLOW_REQ; msg->ssap = ssap; msg->qoscube = cube; memcpy(msg + 1, hash, ipcp_dir_hash_len()); ret = eth_llc_ipcp_send_frame(dst_addr, reverse_bits(MGMT_SAP), reverse_bits(MGMT_SAP), buf, len); free(buf); return ret; } static int eth_llc_ipcp_sap_alloc_resp(uint8_t * dst_addr, uint8_t ssap, uint8_t dsap, int response) { struct mgmt_msg msg; msg.code = FLOW_REPLY; msg.ssap = ssap; msg.dsap = dsap; msg.response = response; return eth_llc_ipcp_send_frame(dst_addr, reverse_bits(MGMT_SAP), reverse_bits(MGMT_SAP), (uint8_t *) &msg, sizeof(msg)); } static int eth_llc_ipcp_sap_req(uint8_t r_sap, uint8_t * r_addr, const uint8_t * dst, qoscube_t cube) { struct timespec ts = {0, ALLOC_TIMEO * MILLION}; struct timespec abstime; int fd; clock_gettime(PTHREAD_COND_CLOCK, &abstime); pthread_mutex_lock(&ipcpi.alloc_lock); while (ipcpi.alloc_id != -1 && ipcp_get_state() == IPCP_OPERATIONAL) { ts_add(&abstime, &ts, &abstime); pthread_cond_timedwait(&ipcpi.alloc_cond, &ipcpi.alloc_lock, &abstime); } if (ipcp_get_state() != IPCP_OPERATIONAL) { log_dbg("Won't allocate over non-operational IPCP."); pthread_mutex_unlock(&ipcpi.alloc_lock); return -1; } /* reply to IRM, called under lock to prevent race */ fd = ipcp_flow_req_arr(getpid(), dst, ipcp_dir_hash_len(), cube); if (fd < 0) { pthread_mutex_unlock(&ipcpi.alloc_lock); log_err("Could not get new flow from IRMd."); return -1; } pthread_rwlock_wrlock(ð_llc_data.flows_lock); eth_llc_data.fd_to_ef[fd].r_sap = r_sap; memcpy(eth_llc_data.fd_to_ef[fd].r_addr, r_addr, MAC_SIZE); ipcpi.alloc_id = fd; pthread_cond_broadcast(&ipcpi.alloc_cond); pthread_rwlock_unlock(ð_llc_data.flows_lock); pthread_mutex_unlock(&ipcpi.alloc_lock); log_dbg("New flow request, fd %d, remote SAP %d.", fd, r_sap); return 0; } static int eth_llc_ipcp_sap_alloc_reply(uint8_t ssap, uint8_t * r_addr, int dsap, int response) { int ret = 0; int fd = -1; pthread_rwlock_wrlock(ð_llc_data.flows_lock); fd = eth_llc_data.ef_to_fd[dsap]; if (fd < 0) { pthread_rwlock_unlock(& eth_llc_data.flows_lock); log_err("No flow found with that SAP."); return -1; /* -EFLOWNOTFOUND */ } if (response) { bmp_release(eth_llc_data.saps, eth_llc_data.fd_to_ef[fd].sap); } else { eth_llc_data.fd_to_ef[fd].r_sap = ssap; memcpy(eth_llc_data.fd_to_ef[fd].r_addr, r_addr, MAC_SIZE); } pthread_rwlock_unlock(ð_llc_data.flows_lock); log_dbg("Flow reply, fd %d, SSAP %d, DSAP %d.", fd, ssap, dsap); if ((ret = ipcp_flow_alloc_reply(fd, response)) < 0) return -1; return ret; } static int eth_llc_ipcp_name_query_req(const uint8_t * hash, uint8_t * r_addr) { uint8_t * buf; struct mgmt_msg * msg; size_t len; if (shim_data_reg_has(eth_llc_data.shim_data, hash)) { len = sizeof(*msg) + ipcp_dir_hash_len(); buf = malloc(len); if (buf == NULL) return -1; msg = (struct mgmt_msg *) buf; msg->code = NAME_QUERY_REPLY; memcpy(msg + 1, hash, ipcp_dir_hash_len()); if (eth_llc_ipcp_send_frame(r_addr, reverse_bits(MGMT_SAP), reverse_bits(MGMT_SAP), buf, len)) { log_err("Failed to send management frame."); free(buf); return -1; } free(buf); } return 0; } static int eth_llc_ipcp_name_query_reply(const uint8_t * hash, uint8_t * r_addr) { uint64_t address = 0; memcpy(&address, r_addr, MAC_SIZE); shim_data_dir_add_entry(eth_llc_data.shim_data, hash, address); shim_data_dir_query_respond(eth_llc_data.shim_data, hash); return 0; } static int eth_llc_ipcp_mgmt_frame(const uint8_t * buf, uint8_t * r_addr) { struct mgmt_msg * msg; msg = (struct mgmt_msg *) buf; switch (msg->code) { case FLOW_REQ: if (shim_data_reg_has(eth_llc_data.shim_data, buf + sizeof(*msg))) { eth_llc_ipcp_sap_req(msg->ssap, r_addr, buf + sizeof(*msg), msg->qoscube); } break; case FLOW_REPLY: eth_llc_ipcp_sap_alloc_reply(msg->ssap, r_addr, msg->dsap, msg->response); break; case NAME_QUERY_REQ: eth_llc_ipcp_name_query_req(buf + sizeof(*msg), r_addr); break; case NAME_QUERY_REPLY: eth_llc_ipcp_name_query_reply(buf + sizeof(*msg), r_addr); break; default: log_err("Unknown message received %d.", msg->code); return -1; } return 0; } static void * eth_llc_ipcp_mgmt_handler(void * o) { int ret; struct timespec timeout = {(MGMT_TIMEO / 1000), (MGMT_TIMEO % 1000) * MILLION}; struct timespec abstime; struct mgmt_frame * frame; (void) o; pthread_cleanup_push((void (*)(void *)) pthread_mutex_unlock, (void *) ð_llc_data.mgmt_lock); while (true) { ret = 0; clock_gettime(PTHREAD_COND_CLOCK, &abstime); ts_add(&abstime, &timeout, &abstime); pthread_mutex_lock(ð_llc_data.mgmt_lock); while (list_is_empty(ð_llc_data.mgmt_frames) && ret != -ETIMEDOUT) ret = -pthread_cond_timedwait(ð_llc_data.mgmt_cond, ð_llc_data.mgmt_lock, &abstime); if (ret == -ETIMEDOUT) { pthread_mutex_unlock(ð_llc_data.mgmt_lock); continue; } frame = list_first_entry((ð_llc_data.mgmt_frames), struct mgmt_frame, next); if (frame == NULL) { pthread_mutex_unlock(ð_llc_data.mgmt_lock); continue; } list_del(&frame->next); pthread_mutex_unlock(ð_llc_data.mgmt_lock); eth_llc_ipcp_mgmt_frame(frame->buf, frame->r_addr); free(frame); } pthread_cleanup_pop(false); return (void *) 0; } static void * eth_llc_ipcp_sdu_reader(void * o) { uint8_t br_addr[MAC_SIZE]; uint16_t length; uint8_t dsap; uint8_t ssap; int fd; #if defined(HAVE_NETMAP) uint8_t * buf; struct nm_pkthdr hdr; #elif defined(HAVE_BPF) uint8_t buf[BPF_BLEN]; #elif defined(HAVE_RAW_SOCKETS) uint8_t buf[ETH_FRAME_SIZE]; #endif int frame_len = 0; struct eth_llc_frame * llc_frame; struct mgmt_frame * frame; (void) o; memset(br_addr, 0xff, MAC_SIZE * sizeof(uint8_t)); while (true) { #if defined(HAVE_NETMAP) if (poll(ð_llc_data.poll_in, 1, -1) < 0) continue; if (eth_llc_data.poll_in.revents == 0) /* TIMED OUT */ continue; buf = nm_nextpkt(eth_llc_data.nmd, &hdr); if (buf == NULL) { log_err("Bad read from netmap device."); continue; } #elif defined(HAVE_BPF) frame_len = read(eth_llc_data.bpf, buf, BPF_BLEN); #elif defined(HAVE_RAW_SOCKETS) frame_len = recv(eth_llc_data.s_fd, buf, SHIM_ETH_LLC_MAX_SDU_SIZE, 0); #endif if (frame_len <= 0) continue; #if defined(HAVE_BPF) && !defined(HAVE_NETMAP) llc_frame = (struct eth_llc_frame *) (buf + ((struct bpf_hdr *) buf)->bh_hdrlen); #else llc_frame = (struct eth_llc_frame *) buf; #endif assert(llc_frame->dst_hwaddr); #if !defined(HAVE_BPF) #if defined(HAVE_NETMAP) if (memcmp(eth_llc_data.hw_addr, #elif defined(HAVE_RAW_SOCKETS) if (memcmp(eth_llc_data.device.sll_addr, #endif /* HAVE_NETMAP */ llc_frame->dst_hwaddr, MAC_SIZE) && memcmp(br_addr, llc_frame->dst_hwaddr, MAC_SIZE)) { } #endif memcpy(&length, &llc_frame->length, sizeof(length)); length = ntohs(length); if (length > 0x05FF) /* DIX */ continue; length -= LLC_HEADER_SIZE; dsap = reverse_bits(llc_frame->dsap); ssap = reverse_bits(llc_frame->ssap); if (ssap == MGMT_SAP && dsap == MGMT_SAP) { pthread_mutex_lock(ð_llc_data.mgmt_lock); frame = malloc(sizeof(*frame)); if (frame == NULL) { pthread_mutex_unlock(ð_llc_data.mgmt_lock); continue; } memcpy(frame->buf, &llc_frame->payload, length); memcpy(frame->r_addr, llc_frame->src_hwaddr, MAC_SIZE); frame->len = length; list_add(&frame->next, ð_llc_data.mgmt_frames); pthread_cond_signal(ð_llc_data.mgmt_cond); pthread_mutex_unlock(ð_llc_data.mgmt_lock); } else { pthread_rwlock_rdlock(ð_llc_data.flows_lock); fd = eth_llc_data.ef_to_fd[dsap]; if (fd < 0) { pthread_rwlock_unlock(ð_llc_data.flows_lock); continue; } if (eth_llc_data.fd_to_ef[fd].r_sap != ssap || memcmp(eth_llc_data.fd_to_ef[fd].r_addr, llc_frame->src_hwaddr, MAC_SIZE)) { pthread_rwlock_unlock(ð_llc_data.flows_lock); continue; } pthread_rwlock_unlock(ð_llc_data.flows_lock); flow_write(fd, &llc_frame->payload, length); } } return (void *) 0; } static void * eth_llc_ipcp_sdu_writer(void * o) { int fd; struct shm_du_buff * sdb; uint8_t ssap; uint8_t dsap; uint8_t r_addr[MAC_SIZE]; (void) o; while (true) { fevent(eth_llc_data.np1_flows, eth_llc_data.fq, NULL); pthread_rwlock_rdlock(ð_llc_data.flows_lock); while ((fd = fqueue_next(eth_llc_data.fq)) >= 0) { if (ipcp_flow_read(fd, &sdb)) { log_err("Bad read from fd %d.", fd); continue; } ssap = reverse_bits(eth_llc_data.fd_to_ef[fd].sap); dsap = reverse_bits(eth_llc_data.fd_to_ef[fd].r_sap); memcpy(r_addr, eth_llc_data.fd_to_ef[fd].r_addr, MAC_SIZE); eth_llc_ipcp_send_frame(r_addr, dsap, ssap, shm_du_buff_head(sdb), shm_du_buff_tail(sdb) - shm_du_buff_head(sdb)); ipcp_sdb_release(sdb); } pthread_rwlock_unlock(ð_llc_data.flows_lock); } return (void *) 1; } #ifdef __linux__ static int open_netlink_socket(void) { struct sockaddr_nl sa; int fd; memset(&sa, 0, sizeof(sa)); sa.nl_family = AF_NETLINK; sa.nl_pid = getpid(); sa.nl_groups = RTMGRP_LINK; fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_ROUTE); if (fd < 0) return -1; if (bind(fd, (struct sockaddr *) &sa, sizeof(sa))) { close(fd); return -1; } return fd; } static void change_flows_state(bool up) { int i; uint32_t flags; pthread_rwlock_rdlock(ð_llc_data.flows_lock); for (i = 0; i < MAX_SAPS; i++) { if (eth_llc_data.ef_to_fd[i] != -1) { fccntl(i, FLOWGFLAGS, &flags); if (up) fccntl(eth_llc_data.ef_to_fd[i], FLOWSFLAGS, flags & ~FLOWFDOWN); else fccntl(eth_llc_data.ef_to_fd[i], FLOWSFLAGS, flags | FLOWFDOWN); } } pthread_rwlock_unlock(ð_llc_data.flows_lock); } static void close_ptr(void * o) { close(*((int *) o)); } static void * eth_llc_ipcp_if_monitor(void * o) { int fd; int status; char buf[4096]; struct iovec iov = {buf, sizeof(buf)}; struct sockaddr_nl snl; struct msghdr msg = {(void *) &snl, sizeof(snl), &iov, 1, NULL, 0, 0}; struct nlmsghdr * h; struct ifinfomsg * ifi; (void ) o; fd = open_netlink_socket(); if (fd < 0) { log_err("Failed to open socket."); return (void *) -1; } pthread_cleanup_push(close_ptr, &fd); while (true) { status = recvmsg(fd, &msg, 0); if (status < 0) continue; for (h = (struct nlmsghdr *) buf; NLMSG_OK(h, (unsigned int) status); h = NLMSG_NEXT(h, status)) { /* Finish reading */ if (h->nlmsg_type == NLMSG_DONE) break; /* Message is some kind of error */ if (h->nlmsg_type == NLMSG_ERROR) continue; /* Only interested in link up/down */ if (h->nlmsg_type != RTM_NEWLINK) continue; ifi = NLMSG_DATA(h); /* Not our interface */ if (ifi->ifi_index != eth_llc_data.device.sll_ifindex) continue; if (ifi->ifi_flags & IFF_UP) { change_flows_state(true); log_dbg("Interface up."); } else { change_flows_state(false); log_dbg("Interface down."); } } } pthread_cleanup_pop(true); return (void *) 0; } #endif #if defined (HAVE_BPF) && !defined(HAVE_NETMAP) static int open_bpf_device(void) { char dev[32]; size_t i = 0; for (i = 0; i < BPF_DEV_MAX; i++) { int fd = -1; snprintf(dev, sizeof(dev), "/dev/bpf%zu", i); fd = open(dev, O_RDWR); if (fd > -1) return fd; } return -1; } #endif static int eth_llc_ipcp_bootstrap(const struct ipcp_config * conf) { int idx; struct ifreq ifr; #if defined(HAVE_NETMAP) char ifn[IFNAMSIZ]; #elif defined(HAVE_BPF) int enable = 1; int disable = 0; int blen; #endif /* HAVE_NETMAP */ #if defined(__FreeBSD__) || defined(__APPLE__) struct ifaddrs * ifaddr; struct ifaddrs * ifa; #elif defined(__linux__) int skfd; #endif assert(conf); assert(conf->type == THIS_TYPE); if (conf->if_name == NULL) { log_err("Interface name is NULL."); return -1; } memset(&ifr, 0, sizeof(ifr)); memcpy(ifr.ifr_name, conf->if_name, strlen(conf->if_name)); #if defined(__FreeBSD__) || defined(__APPLE__) if (getifaddrs(&ifaddr) < 0) { log_err("Could not get interfaces."); return -1; } for (ifa = ifaddr, idx = 0; ifa != NULL; ifa = ifa->ifa_next, ++idx) { if (strcmp(ifa->ifa_name, conf->if_name)) continue; log_dbg("Interface %s found.", conf->if_name); #if defined(HAVE_NETMAP) || defined(HAVE_BPF) memcpy(eth_llc_data.hw_addr, LLADDR((struct sockaddr_dl *) (ifa)->ifa_addr), MAC_SIZE); #elif defined (HAVE_RAW_SOCKETS) memcpy(&ifr.ifr_addr, ifa->ifa_addr, sizeof(*ifa->ifa_addr)); #endif break; } freeifaddrs(ifaddr); if (ifa == NULL) { log_err("Interface not found."); return -1; } #elif defined(__linux__) skfd = socket(AF_UNIX, SOCK_STREAM, 0); if (skfd < 0) { log_err("Failed to open socket."); return -1; } if (ioctl(skfd, SIOCGIFHWADDR, &ifr)) { log_err("Failed to ioctl."); close(skfd); return -1; } close(skfd); idx = if_nametoindex(conf->if_name); if (idx == 0) { log_err("Failed to retrieve interface index."); close(skfd); return -1; } #endif /* __FreeBSD__ */ #if defined(HAVE_NETMAP) strcpy(ifn, "netmap:"); strcat(ifn, conf->if_name); eth_llc_data.nmd = nm_open(ifn, NULL, 0, NULL); if (eth_llc_data.nmd == NULL) { log_err("Failed to open netmap device."); return -1; } memset(ð_llc_data.poll_in, 0, sizeof(eth_llc_data.poll_in)); memset(ð_llc_data.poll_out, 0, sizeof(eth_llc_data.poll_out)); eth_llc_data.poll_in.fd = NETMAP_FD(eth_llc_data.nmd); eth_llc_data.poll_in.events = POLLIN; eth_llc_data.poll_out.fd = NETMAP_FD(eth_llc_data.nmd); eth_llc_data.poll_out.events = POLLOUT; log_info("Using netmap device."); #elif defined(HAVE_BPF) /* !HAVE_NETMAP */ eth_llc_data.bpf = open_bpf_device(); if (eth_llc_data.bpf < 0) { log_err("Failed to open bpf device."); return -1; } ioctl(eth_llc_data.bpf, BIOCGBLEN, &blen); if (BPF_BLEN < blen) { log_err("BPF buffer too small (is: %ld must be: %d).", BPF_BLEN, blen); goto fail_device; } if (ioctl(eth_llc_data.bpf, BIOCSETIF, &ifr) < 0) { log_err("Failed to set interface."); goto fail_device; } if (ioctl(eth_llc_data.bpf, BIOCSHDRCMPLT, &enable) < 0) { log_err("Failed to set BIOCSHDRCMPLT."); goto fail_device; } if (ioctl(eth_llc_data.bpf, BIOCSSEESENT, &disable) < 0) { log_err("Failed to set BIOCSSEESENT."); goto fail_device; } if (ioctl(eth_llc_data.bpf, BIOCIMMEDIATE, &enable) < 0) { log_err("Failed to set BIOCIMMEDIATE."); goto fail_device; } log_info("Using Berkeley Packet Filter."); #elif defined(HAVE_RAW_SOCKETS) memset(&(eth_llc_data.device), 0, sizeof(eth_llc_data.device)); eth_llc_data.device.sll_ifindex = idx; eth_llc_data.device.sll_family = AF_PACKET; memcpy(eth_llc_data.device.sll_addr, ifr.ifr_hwaddr.sa_data, MAC_SIZE); eth_llc_data.device.sll_halen = MAC_SIZE; eth_llc_data.device.sll_protocol = htons(ETH_P_ALL); eth_llc_data.s_fd = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_802_2)); log_info("Using raw socket device."); if (eth_llc_data.s_fd < 0) { log_err("Failed to create socket."); return -1; } if (bind(eth_llc_data.s_fd, (struct sockaddr *) ð_llc_data.device, sizeof(eth_llc_data.device))) { log_err("Failed to bind socket to interface"); goto fail_device; } #endif /* HAVE_NETMAP */ ipcp_set_state(IPCP_OPERATIONAL); #ifdef __linux__ if (pthread_create(ð_llc_data.if_monitor, NULL, eth_llc_ipcp_if_monitor, NULL)) { ipcp_set_state(IPCP_INIT); goto fail_device; } #endif if (pthread_create(ð_llc_data.mgmt_handler, NULL, eth_llc_ipcp_mgmt_handler, NULL)) { ipcp_set_state(IPCP_INIT); goto fail_mgmt_handler; } if (pthread_create(ð_llc_data.sdu_reader, NULL, eth_llc_ipcp_sdu_reader, NULL)) { ipcp_set_state(IPCP_INIT); goto fail_sdu_reader; } if (pthread_create(ð_llc_data.sdu_writer, NULL, eth_llc_ipcp_sdu_writer, NULL)) { ipcp_set_state(IPCP_INIT); goto fail_sdu_writer; } log_dbg("Bootstrapped IPCP over Ethernet with LLC with pid %d.", getpid()); return 0; fail_sdu_writer: pthread_cancel(eth_llc_data.sdu_reader); pthread_join(eth_llc_data.sdu_reader, NULL); fail_sdu_reader: pthread_cancel(eth_llc_data.mgmt_handler); pthread_join(eth_llc_data.mgmt_handler, NULL); fail_mgmt_handler: #if defined(__linux__) pthread_cancel(eth_llc_data.if_monitor); pthread_join(eth_llc_data.if_monitor, NULL); #endif #if !defined(HAVE_NETMAP) fail_device: #endif #if defined(HAVE_NETMAP) nm_close(eth_llc_data.nmd); #elif defined(HAVE_BPF) close(eth_llc_data.bpf); #elif defined(HAVE_RAW_SOCKETS) close(eth_llc_data.s_fd); #endif return -1; } static int eth_llc_ipcp_reg(const uint8_t * hash) { if (shim_data_reg_add_entry(eth_llc_data.shim_data, hash)) { log_err("Failed to add " HASH_FMT " to local registry.", HASH_VAL(hash)); return -1; } log_dbg("Registered " HASH_FMT ".", HASH_VAL(hash)); return 0; } static int eth_llc_ipcp_unreg(const uint8_t * hash) { shim_data_reg_del_entry(eth_llc_data.shim_data, hash); return 0; } static int eth_llc_ipcp_query(const uint8_t * hash) { uint8_t r_addr[MAC_SIZE]; struct timespec timeout = {(NAME_QUERY_TIMEO / 1000), (NAME_QUERY_TIMEO % 1000) * MILLION}; struct dir_query * query; int ret; uint8_t * buf; struct mgmt_msg * msg; size_t len; if (shim_data_dir_has(eth_llc_data.shim_data, hash)) return 0; len = sizeof(*msg) + ipcp_dir_hash_len(); buf = malloc(len); if (buf == NULL) return -1; msg = (struct mgmt_msg *) buf; msg->code = NAME_QUERY_REQ; memcpy(buf + sizeof(*msg), hash, ipcp_dir_hash_len()); memset(r_addr, 0xff, MAC_SIZE); query = shim_data_dir_query_create(eth_llc_data.shim_data, hash); if (query == NULL) { free(buf); return -1; } if (eth_llc_ipcp_send_frame(r_addr, reverse_bits(MGMT_SAP), reverse_bits(MGMT_SAP), buf, len)) { log_err("Failed to send management frame."); shim_data_dir_query_destroy(eth_llc_data.shim_data, query); free(buf); return -1; } free(buf); ret = shim_data_dir_query_wait(query, &timeout); shim_data_dir_query_destroy(eth_llc_data.shim_data, query); return ret; } static int eth_llc_ipcp_flow_alloc(int fd, const uint8_t * hash, qoscube_t cube) { uint8_t ssap = 0; uint8_t r_addr[MAC_SIZE]; uint64_t addr = 0; log_dbg("Allocating flow to " HASH_FMT ".", HASH_VAL(hash)); assert(hash); if (cube != QOS_CUBE_BE) { log_dbg("Unsupported QoS requested."); return -1; } if (!shim_data_dir_has(eth_llc_data.shim_data, hash)) { log_err("Destination unreachable."); return -1; } addr = shim_data_dir_get_addr(eth_llc_data.shim_data, hash); pthread_rwlock_wrlock(ð_llc_data.flows_lock); ssap = bmp_allocate(eth_llc_data.saps); if (!bmp_is_id_valid(eth_llc_data.saps, ssap)) { pthread_rwlock_unlock(ð_llc_data.flows_lock); return -1; } eth_llc_data.fd_to_ef[fd].sap = ssap; eth_llc_data.ef_to_fd[ssap] = fd; pthread_rwlock_unlock(ð_llc_data.flows_lock); memcpy(r_addr, &addr, MAC_SIZE); if (eth_llc_ipcp_sap_alloc(r_addr, ssap, hash, cube) < 0) { pthread_rwlock_wrlock(ð_llc_data.flows_lock); bmp_release(eth_llc_data.saps, eth_llc_data.fd_to_ef[fd].sap); eth_llc_data.fd_to_ef[fd].sap = -1; eth_llc_data.ef_to_fd[ssap] = -1; pthread_rwlock_unlock(ð_llc_data.flows_lock); return -1; } fset_add(eth_llc_data.np1_flows, fd); log_dbg("Pending flow with fd %d on SAP %d.", fd, ssap); return 0; } static int eth_llc_ipcp_flow_alloc_resp(int fd, int response) { struct timespec ts = {0, ALLOC_TIMEO * MILLION}; struct timespec abstime; uint8_t ssap = 0; uint8_t r_sap = 0; uint8_t r_addr[MAC_SIZE]; clock_gettime(PTHREAD_COND_CLOCK, &abstime); pthread_mutex_lock(&ipcpi.alloc_lock); while (ipcpi.alloc_id != fd && ipcp_get_state() == IPCP_OPERATIONAL) { ts_add(&abstime, &ts, &abstime); pthread_cond_timedwait(&ipcpi.alloc_cond, &ipcpi.alloc_lock, &abstime); } if (ipcp_get_state() != IPCP_OPERATIONAL) { pthread_mutex_unlock(&ipcpi.alloc_lock); return -1; } ipcpi.alloc_id = -1; pthread_cond_broadcast(&ipcpi.alloc_cond); pthread_mutex_unlock(&ipcpi.alloc_lock); pthread_rwlock_wrlock(ð_llc_data.flows_lock); ssap = bmp_allocate(eth_llc_data.saps); if (!bmp_is_id_valid(eth_llc_data.saps, ssap)) { pthread_rwlock_unlock(ð_llc_data.flows_lock); return -1; } eth_llc_data.fd_to_ef[fd].sap = ssap; memcpy(r_addr, eth_llc_data.fd_to_ef[fd].r_addr, MAC_SIZE); r_sap = eth_llc_data.fd_to_ef[fd].r_sap; eth_llc_data.ef_to_fd[ssap] = fd; pthread_rwlock_unlock(ð_llc_data.flows_lock); if (eth_llc_ipcp_sap_alloc_resp(r_addr, ssap, r_sap, response) < 0) { pthread_rwlock_wrlock(ð_llc_data.flows_lock); bmp_release(eth_llc_data.saps, eth_llc_data.fd_to_ef[fd].sap); pthread_rwlock_unlock(ð_llc_data.flows_lock); return -1; } fset_add(eth_llc_data.np1_flows, fd); log_dbg("Accepted flow, fd %d, SAP %d.", fd, (uint8_t)ssap); return 0; } static int eth_llc_ipcp_flow_dealloc(int fd) { uint8_t sap; uint8_t addr[MAC_SIZE]; ipcp_flow_fini(fd); pthread_rwlock_wrlock(ð_llc_data.flows_lock); fset_del(eth_llc_data.np1_flows, fd); sap = eth_llc_data.fd_to_ef[fd].sap; memcpy(addr, eth_llc_data.fd_to_ef[fd].r_addr, MAC_SIZE); bmp_release(eth_llc_data.saps, sap); eth_llc_data.fd_to_ef[fd].sap = -1; eth_llc_data.fd_to_ef[fd].r_sap = -1; memset(ð_llc_data.fd_to_ef[fd].r_addr, 0, MAC_SIZE); eth_llc_data.ef_to_fd[sap] = -1; pthread_rwlock_unlock(ð_llc_data.flows_lock); flow_dealloc(fd); log_dbg("Flow with fd %d deallocated.", fd); return 0; } static struct ipcp_ops eth_llc_ops = { .ipcp_bootstrap = eth_llc_ipcp_bootstrap, .ipcp_enroll = NULL, .ipcp_connect = NULL, .ipcp_disconnect = NULL, .ipcp_reg = eth_llc_ipcp_reg, .ipcp_unreg = eth_llc_ipcp_unreg, .ipcp_query = eth_llc_ipcp_query, .ipcp_flow_alloc = eth_llc_ipcp_flow_alloc, .ipcp_flow_alloc_resp = eth_llc_ipcp_flow_alloc_resp, .ipcp_flow_dealloc = eth_llc_ipcp_flow_dealloc }; int main(int argc, char * argv[]) { if (ipcp_init(argc, argv, ð_llc_ops) < 0) goto fail_init; if (eth_llc_data_init() < 0) { log_err("Failed to init eth-llc data."); goto fail_data_init; } if (ipcp_boot() < 0) { log_err("Failed to boot IPCP."); goto fail_boot; } if (ipcp_create_r(getpid(), 0)) { log_err("Failed to notify IRMd we are initialized."); ipcp_set_state(IPCP_NULL); goto fail_create_r; } ipcp_shutdown(); if (ipcp_get_state() == IPCP_SHUTDOWN) { pthread_cancel(eth_llc_data.sdu_writer); pthread_cancel(eth_llc_data.sdu_reader); pthread_cancel(eth_llc_data.mgmt_handler); #ifdef __linux__ pthread_cancel(eth_llc_data.if_monitor); #endif pthread_join(eth_llc_data.sdu_writer, NULL); pthread_join(eth_llc_data.sdu_reader, NULL); pthread_join(eth_llc_data.mgmt_handler, NULL); #ifdef __linux__ pthread_join(eth_llc_data.if_monitor, NULL); #endif } eth_llc_data_fini(); ipcp_fini(); exit(EXIT_SUCCESS); fail_create_r: ipcp_shutdown(); fail_boot: eth_llc_data_fini(); fail_data_init: ipcp_fini(); fail_init: ipcp_create_r(getpid(), -1); exit(EXIT_FAILURE); }