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-rwxr-xr-xhicn-light/src/socket/ops_linux.c1723
1 files changed, 1723 insertions, 0 deletions
diff --git a/hicn-light/src/socket/ops_linux.c b/hicn-light/src/socket/ops_linux.c
new file mode 100755
index 000000000..d085f0d3d
--- /dev/null
+++ b/hicn-light/src/socket/ops_linux.c
@@ -0,0 +1,1723 @@
+#include <sys/ioctl.h> // ioctl
+#include <sys/socket.h> // needed by linux/if.h
+//#include <linux/if.h>
+#include <errno.h>
+#include <fcntl.h> // ''
+#include <linux/if_tun.h>
+#include <linux/limits.h> // PATH_MAX
+#include <stdio.h> // fprintf
+#include <string.h> // memset
+#include <sys/stat.h> // open
+#include <sys/uio.h> // writev
+#include <unistd.h> // close
+
+#include "error.h"
+#include "ops.h"
+
+#define ARRAY_SIZE(a) (sizeof(a) / sizeof(*(a)))
+
+/******************************************************************************
+ * netlink.h
+ ******************************************************************************/
+
+#ifndef HICN_NETLINK_H
+#define HICN_NETLINK_H
+
+#include <stdint.h>
+#include <stdlib.h>
+
+// DEPRECATED|/* Socket */
+// DEPRECATED|int _nl_get_socket();
+// DEPRECATED|int _nl_send(int s, uint8_t * buffer, size_t len);
+// DEPRECATED|size_t _nl_receive(uint8_t * buffer, size_t len);
+// DEPRECATED|
+// DEPRECATED|/* Netlink packet format */
+// DEPRECATED|int _nl_header(int request, uint8_t * buffer, size_t len, uint32_t
+// flags); DEPRECATED|int _nl_payload_rule(uint8_t table_id, uint8_t * buffer,
+// size_t len); DEPRECATED|int _nl_payload_link(uint32_t ifindex, uint8_t *
+// buffer, size_t len); DEPRECATED|int _nl_payload_route(uint8_t table_id,
+// uint8_t dst_len, uint8_t * buffer, size_t len); DEPRECATED| DEPRECATED|int
+// _nl_parse(uint8_t * buffer, size_t len); DEPRECATED|int _nl_parse_ret(uint8_t
+// * buffer, size_t len); DEPRECATED|int _nl_parse_link_ifid(uint8_t * buffer,
+// size_t len, uint32_t * interface_id); DEPRECATED|int
+// _nl_parse_link_ip_addr(uint8_t * buffer, size_t len, struct in6_addr * addr);
+
+/* Public interface */
+
+/**
+ * Get the interface ID of an interface by its name
+ *
+ * @return 32-bit interface identifier in case of success, or 0.
+ *
+ * @see if_nametoindex
+ *
+ */
+uint32_t _nl_get_ifid(const char *ifname);
+
+/**
+ * Retrieve the output interface corresponding to the specified IP address.
+ *
+ * @param [in] addr IP(v6) address in presentation form.
+ * @param [out] Identifier of the corresponding output interface.
+ * @return int 0 in case of success, -1 otherwise
+ */
+int _nl_get_output_ifid(const char *ip_address, uint8_t address_family,
+ uint32_t *interface_id);
+
+/**
+ * Retrieve the first IP address of an interface (identified by its id) which
+ * has a netmask < 128.
+ *
+ * @param [in] s File descriptor of the netlink socket (deprecated).
+ * @param [in] interface_id Identifier of the interface for which to retrieve
+ * the IP address.
+ * @param [out] addr IP(v6) address in binary form.
+ * @return int 0 in case of success, -1 otherwise
+ *
+ * @see getifaddrs
+ */
+int _nl_get_ip_addr(uint32_t interface_id, uint8_t address_family,
+ ip_address_t *ip_address);
+
+int _nl_set_ip_addr(uint32_t interface_id, ip_address_t *ip_address);
+
+int _nl_up_if(uint32_t interface_id);
+
+int _nl_add_in_route_table(const ip_address_t *prefix,
+ const uint32_t interface_id, const uint8_t table_id);
+int _nl_add_in_route_table_s(const char *prefix, const uint32_t interface_id,
+ const uint8_t table_id);
+int _nl_add_in_route_s(const char *prefix, const uint32_t interface_id);
+
+int _nl_add_out_route(const char *gateway, const uint8_t address_family,
+ const uint8_t table_idi, int default_route);
+int _nl_del_out_route(const char *gateway, const uint8_t address_family,
+ const uint8_t table_id);
+
+int _nl_del_lo_route(const ip_address_t *ip_address);
+
+int _nl_add_rule(const char *interface_name, const uint8_t address_family,
+ const uint8_t table_id);
+int _nl_del_rule(const char *interface_name, const uint8_t address_family,
+ const uint8_t table_id);
+
+int _nl_add_neigh_proxy(const ip_address_t *ip_address,
+ const uint32_t interface_id);
+
+int _nl_add_prio_rule(const ip_address_t *ip_address,
+ const uint8_t address_family, const uint32_t priority,
+ const uint8_t table_id);
+int _nl_add_lo_prio_rule(const ip_address_t *ip_address,
+ const uint8_t address_family, const uint32_t priority);
+int _nl_del_prio_rule(const ip_address_t *ip_address,
+ const uint8_t address_family, const uint32_t priority,
+ const uint8_t table_id);
+int _nl_del_lo_prio_rule(const ip_address_t *ip_address,
+ const uint8_t address_family, const uint32_t priority);
+
+#endif /* HICN_NETLINK_H */
+
+/******************************************************************************
+ * netlink.c
+ ******************************************************************************/
+
+/*
+ * This module offers an interface to the Netlink API appropriate for
+ * implementing punting as required by hICN (1).
+ *
+ * More specifically, it consists of the following functionalities:
+ * - LINK
+ . map interface name to ID
+ . set and interface up
+ * - ADDR
+ . get and set ip addresses on a given interface ID
+ * - ROUTE
+ . get output interface id towards IP (ip route get IP > interface_id)
+ . add input route (ip route add PREFIX dev INTERFACE) for punting
+ interests . add output route (ip route add default GATEWAY table TABLE) for
+ routing interests (2, 3) . delete local route towards IP (ip route del IP table
+ local) for ???
+ /!\ could this be avoided by removing the local attribute in the
+ netlink call ?
+ * - RULE
+ * . add output rule (ip rule add iif interface table TABLE) for routing
+ interests (2, 3)
+ * - ND PROXY
+ * . enable NDP proxy functionality for IP on interface ID (ip -6 neigh add
+ proxy IP dev INTERFACE)
+ * for allowing the TUN to be reachable on the reverse data path
+ *
+ * Implementation notes:
+ * (1) We have not been using the libnl library because it requires
+ * manipulating too many function and data structures for a simple purpose.
+ * Currently, many parts of the code are somehow repetitive, but this might
+ * be improved by a proper API in a future release.
+ * (2) allows load balancing over different interfaces = multihoming. Please
+ * note that it is not possible to have load balancing over two faces using
+ * the same output interface as we are using the underlying IP network !
+ * This might be mitigated with the use of SR however.
+ * (3) The implementation of punting heavily uses the policy routing
+ * functionalities, as we need to hook through a TUN into user space a
+ * whole prefix used as a destination (for interests) or source (for data
+ * packets). We thus combine the use of rules to assign routing table IDs,
+ * and routes inside those tables. As there is no easy way to allocate
+ * which routing tables we use, we made the choice to index them by the ID
+ * of the interface, assuming there is no external conflict. This might be
+ * improved in the future.
+ *
+ * This hICN implementation uses TUNs in two different ways:
+ * - a main TUN interface, which receives all punted interests,
+ * demultiplex them before assigning them an input face (eventually
+ * dynamically creating it);
+ * - a set of output TUN interfaces, aka faces, used for routing of
+ * interests, and for receiving the corresponding data packets on the way
+ * back. Punting of data packets if based of their destination IP, which
+ * is the IP of the physical output interface used for the interest, which
+ * is unique (cf (2)).
+ *
+ * The corresponding routing tables IDs are :
+ * MAIN_TUN_ID -> used for punting of data packets
+ * OUTPUT_TUN_ID_i -> used for routing of interests towards next hop
+ * (bypassing local IP routing table)
+ *
+ * Note that punting of interests is done just through a route, and routing
+ * of data packets is done just through the regular IP routing table on the
+ * note after the address translation done in the forwarder.
+ *
+ * - Forging netlink packets
+ *
+ * A previous implementation used function calls with pointers to populate
+ * the various header parts in a buffer in order to build a netlink packet.
+ * A newer implementation uses nested structs and iovecs to build the whole
+ * packet in a single write call. This should allow a simpler evolution
+ * towards a cleaner API.
+ */
+
+#include <arpa/inet.h> // inet_pton
+#include <errno.h> // errno
+#include <linux/fib_rules.h> // fib_rule_hdr, FRA_*
+#include <linux/netlink.h>
+#include <linux/rtnetlink.h>
+#include <net/if.h> // IFF_UP
+#include <netinet/in.h> // in6addr
+#include <stdio.h> // perror
+#include <string.h>
+#include <sys/socket.h> // ''
+#include <sys/types.h> // socket
+#include <unistd.h> // read
+
+#include <sys/socket.h> // ''
+#include <sys/types.h> // send, recv
+
+//#include "../../hicn.h"
+//#include "../../hicn_util.h" // ARRAY_SIZE, hicn_packet_dump_iov
+
+#define BUFSIZE 4096
+#define FLAGS_CREATE NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK
+// ??
+#define FLAGS_CREATE_MATCH \
+ NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK | NLM_F_MATCH
+
+// XXX putting ACK poses a prolem for the value received by get_if_id.
+#define FLAGS_GET NLM_F_REQUEST
+#define FLAGS_GET_ROOT (NLM_F_REQUEST | NLM_F_ROOT)
+
+#define FLAGS_LIST NLM_F_REQUEST | NLM_F_DUMP
+
+#define IF_NAMESIZE 16
+#define FR_ACT_TO_TBL 1
+#define NLMSG_BOTTOM(nlmsg) \
+ ((struct rtattr *)(((void *)(nlmsg)) + NLMSG_ALIGN((nlmsg)->nlmsg_len)))
+
+int seq = 1;
+
+static inline size_t iov_length(const struct iovec *iov,
+ unsigned long nr_segs) {
+ unsigned long seg;
+ size_t ret = 0;
+
+ for (seg = 0; seg < nr_segs; seg++) ret += iov[seg].iov_len;
+ return ret;
+}
+
+typedef struct {
+ struct nlmsghdr hdr;
+ struct nlmsgerr payload;
+} nl_err_hdr_t;
+
+/* Low level : nl header */
+
+int _nl_get_socket() { return socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE); }
+
+int _nl_header(int request, uint8_t *buffer, size_t len, uint32_t flags) {
+ struct nlmsghdr *nl = (struct nlmsghdr *)buffer;
+
+ nl->nlmsg_len = 0; // NLMSG_LENGTH(sizeof(struct ifinfomsg));
+ nl->nlmsg_type = request;
+ nl->nlmsg_flags = flags;
+ nl->nlmsg_seq = seq++; //
+ nl->nlmsg_pid = 0; // getpid();
+
+ return 0;
+}
+
+/* Low level : nl protocols */
+
+/* Low level : attributes */
+
+int addAttr(struct nlmsghdr *nl, int maxlen, int type, void *data,
+ int attr_len) {
+ struct rtattr *rta;
+ int len = RTA_LENGTH(attr_len);
+
+ if (NLMSG_ALIGN(nl->nlmsg_len) + len > maxlen) {
+ exit(EXIT_FAILURE);
+ }
+
+ rta = (struct rtattr *)((char *)nl + NLMSG_ALIGN(nl->nlmsg_len));
+ rta->rta_type = type;
+ rta->rta_len = len;
+ memcpy(RTA_DATA(rta), data, attr_len);
+ nl->nlmsg_len = NLMSG_ALIGN(nl->nlmsg_len) + len;
+ return 0;
+}
+
+int _nl_payload_rule(uint8_t table_id, uint8_t address_family, uint8_t *buffer,
+ size_t len) {
+ struct nlmsghdr *nl = (struct nlmsghdr *)buffer;
+ struct fib_rule_hdr *frh = (struct fib_rule_hdr *)(NLMSG_DATA(buffer));
+
+ memset(frh, 0, sizeof(struct fib_rule_hdr));
+ frh->family = address_family;
+ frh->table = table_id;
+ frh->action = FR_ACT_TO_TBL,
+ frh->flags = NLM_F_REPLACE; // 0
+ frh->tos = 0;
+
+ nl->nlmsg_len += NLMSG_LENGTH(sizeof(struct fib_rule_hdr));
+
+ return 0;
+}
+
+int _nl_payload_link(uint32_t ifindex, uint8_t *buffer, size_t len) {
+ struct nlmsghdr *nl = (struct nlmsghdr *)buffer;
+ struct ifinfomsg *ifi = (struct ifinfomsg *)(NLMSG_DATA(buffer));
+
+ memset(ifi, 0, sizeof(struct ifinfomsg));
+ ifi->ifi_family = AF_UNSPEC;
+ // ifi->ifi_type = 0;
+ ifi->ifi_index =
+ ifindex; // new interface, could be specified since linux 3.7
+ ifi->ifi_flags = 0;
+ // ifi->ifi_change = 0xffffffff;
+
+ nl->nlmsg_len += NLMSG_LENGTH(sizeof(struct ifinfomsg));
+
+ return 0;
+}
+
+int _nl_payload_addr(uint32_t ifindex, uint8_t *buffer, size_t len) {
+ struct nlmsghdr *nl = (struct nlmsghdr *)buffer;
+ struct ifaddrmsg *addr = (struct ifaddrmsg *)(NLMSG_DATA(buffer));
+
+ memset(addr, 0, sizeof(struct ifaddrmsg));
+ addr->ifa_family = AF_UNSPEC; // INET6;
+ /*
+ addr->ifa_prefixlen = 128;
+ addr->ifa_flags = 0;
+ addr->ifa_scope = RT_SCOPE_LINK; //IFA_ADDRESS;
+ addr->ifa_index = ifindex;
+ */
+
+ nl->nlmsg_len += NLMSG_LENGTH(sizeof(struct ifaddrmsg)) - 4;
+
+ return 0;
+}
+
+int _nl_payload_route(uint8_t table_id, uint8_t addr_family, uint8_t dst_len,
+ uint8_t *buffer, size_t len) {
+ struct nlmsghdr *nl = (struct nlmsghdr *)buffer;
+ struct rtmsg *raddr = (struct rtmsg *)(NLMSG_DATA(buffer));
+
+ raddr->rtm_family = addr_family;
+ raddr->rtm_dst_len = dst_len;
+ raddr->rtm_src_len = 0;
+ raddr->rtm_tos = 0;
+
+ raddr->rtm_table = table_id;
+ raddr->rtm_protocol = RTPROT_BOOT;
+ raddr->rtm_scope = RT_SCOPE_UNIVERSE;
+ raddr->rtm_type = RTN_UNICAST;
+
+ raddr->rtm_flags = 0;
+
+ nl->nlmsg_len += NLMSG_LENGTH(sizeof(struct rtmsg));
+
+ return 0;
+}
+
+uint32_t _nl_get_ifid(const char *interface_name) {
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+ size_t len = interface_name ? strlen(interface_name) + 1 : 0;
+ uint8_t padding[RTA_ALIGNTO] = {0, 0, 0, 0};
+
+ if (len == 0) {
+ goto ERR_IF;
+ }
+
+ struct {
+ struct nlmsghdr hdr;
+ struct ifinfomsg payload;
+ } msg = {//.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+ .hdr.nlmsg_type = RTM_GETLINK,
+ .hdr.nlmsg_flags = FLAGS_GET,
+ .payload.ifi_family = AF_UNSPEC,
+ .payload.ifi_index = 0};
+ struct rtattr a_ifname = {RTA_LENGTH(strlen(interface_name) + 1),
+ IFLA_IFNAME};
+
+ struct iovec iov[] = {{&msg, sizeof(msg)},
+ {&a_ifname, sizeof(a_ifname)},
+ {(char *)interface_name, len},
+ {padding, RTA_SPACE(len) - RTA_LENGTH(len)}};
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR_SOCKET;
+ }
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR_SEND;
+ }
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR_RECV;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR_NL;
+ }
+ return 0; /* Unexpected */
+ }
+
+ for (; NLMSG_OK(hdr, n); hdr = NLMSG_NEXT(hdr, n)) {
+ struct ifinfomsg *payload = (struct ifinfomsg *)NLMSG_DATA(hdr);
+ return payload->ifi_index;
+ }
+ return 0;
+
+ERR_NL:
+ERR_RECV:
+ERR_SEND:
+ERR_SOCKET:
+ERR_IF:
+ return 0;
+}
+
+int _nl_get_output_ifid(const char *ip_address, uint8_t family_address,
+ uint32_t *interface_id) {
+ int rc;
+
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR;
+ }
+
+ if (family_address == AF_INET6) {
+ struct in6_addr addr; // V6SPECIFIC
+
+ struct {
+ struct nlmsghdr hdr;
+ struct rtmsg payload;
+ } msg = {
+ .hdr.nlmsg_type = RTM_GETROUTE,
+ .hdr.nlmsg_flags = NLM_F_REQUEST,
+ .hdr.nlmsg_seq = seq++,
+ .payload.rtm_family = AF_INET6,
+ .payload.rtm_dst_len = IPV6_ADDR_LEN_BITS,
+ .payload.rtm_src_len = 0,
+ .payload.rtm_tos = 0,
+ .payload.rtm_table = RT_TABLE_UNSPEC,
+ .payload.rtm_protocol = RTPROT_UNSPEC,
+ .payload.rtm_scope = RT_SCOPE_UNIVERSE,
+ .payload.rtm_type = RTN_UNSPEC,
+ .payload.rtm_flags = 0 // RTM_F_NOTIFY in 'ip route get'
+ };
+
+ /* Convert the IP address to binary form */
+ rc = inet_pton(AF_INET6, ip_address, &addr);
+ if (rc <= 0) {
+ goto ERR;
+ }
+
+ /* Set attribute = length/type/value */
+ struct rtattr a_dst = {RTA_LENGTH(16), RTA_DST};
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ {&a_dst, sizeof(a_dst)}, // attribute
+ {&addr, sizeof(addr)} // value
+ };
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR;
+ }
+ } else if (family_address == AF_INET) {
+ struct in_addr addr;
+
+ struct {
+ struct nlmsghdr hdr;
+ struct rtmsg payload;
+ } msg = {
+ .hdr.nlmsg_type = RTM_GETROUTE,
+ .hdr.nlmsg_flags = NLM_F_REQUEST,
+ .hdr.nlmsg_seq = seq++,
+ .payload.rtm_family = AF_INET,
+ .payload.rtm_dst_len = IPV4_ADDR_LEN_BITS,
+ .payload.rtm_src_len = 0,
+ .payload.rtm_tos = 0,
+ .payload.rtm_table = RT_TABLE_UNSPEC,
+ .payload.rtm_protocol = RTPROT_UNSPEC,
+ .payload.rtm_scope = RT_SCOPE_UNIVERSE,
+ .payload.rtm_type = RTN_UNSPEC,
+ .payload.rtm_flags = 0 // RTM_F_NOTIFY in 'ip route get'
+ };
+
+ /* Convert the IP address to binary form */
+ rc = inet_pton(AF_INET, ip_address, &addr);
+ if (rc <= 0) {
+ goto ERR;
+ }
+
+ /* Set attribute = length/type/value */
+ struct rtattr a_dst = {RTA_LENGTH(4), RTA_DST};
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ {&a_dst, sizeof(a_dst)}, // attribute
+ {&addr, sizeof(addr)} // value
+ };
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR;
+ }
+ } else {
+ goto ERR;
+ }
+
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR;
+ }
+ return HICN_SOCKET_ERROR_UNEXPECTED; /* Unexpected */
+ }
+
+ for (; NLMSG_OK(hdr, n); hdr = NLMSG_NEXT(hdr, n)) {
+ struct rtmsg *rtm = (struct rtmsg *)NLMSG_DATA(hdr);
+ int attrlen = RTM_PAYLOAD(hdr);
+ struct rtattr *rta;
+ for (rta = RTM_RTA(rtm); RTA_OK(rta, attrlen);
+ rta = RTA_NEXT(rta, attrlen)) {
+ if (rta->rta_type == RTA_OIF) {
+ *interface_id = *(uint32_t *)RTA_DATA(rta);
+ return HICN_SOCKET_ERROR_NONE;
+ }
+ }
+ }
+
+ return HICN_SOCKET_ERROR_NONE;
+
+ERR:
+ return HICN_SOCKET_ERROR_UNSPEC;
+}
+
+int _nl_get_ip_addr(uint32_t interface_id, uint8_t address_family,
+ ip_address_t *ip_address) {
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ struct {
+ struct nlmsghdr hdr;
+ struct ifaddrmsg payload;
+ } msg = {.hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifaddrmsg)),
+ .hdr.nlmsg_type = RTM_GETADDR,
+ .hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ROOT, // | NLM_F_MATCH,
+ .payload.ifa_family = address_family,
+ .payload.ifa_index = 0};
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR_SOCKET;
+ }
+
+ n = send(fd, &msg, sizeof(msg), 0);
+ if (n == -1) {
+ goto ERR_SEND;
+ }
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR_RECV;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR_NL;
+ }
+ return -99; /* Unexpected */
+ }
+
+ for (; NLMSG_OK(hdr, n); hdr = NLMSG_NEXT(hdr, n)) {
+ struct ifaddrmsg *payload = (struct ifaddrmsg *)NLMSG_DATA(hdr);
+
+ if (address_family == AF_INET6) {
+ if ((payload->ifa_index == interface_id) &&
+ (payload->ifa_prefixlen < IPV6_ADDR_LEN * 8)) {
+ printf("got ip address\n");
+ memcpy(ip_address->buffer, RTA_DATA(payload + 1), IPV6_ADDR_LEN);
+ ip_address->family = AF_INET6;
+ ip_address->prefix_len = IPV6_ADDR_LEN_BITS;
+ printf("returning %d\n", HICN_SOCKET_ERROR_NONE);
+ return HICN_SOCKET_ERROR_NONE;
+ }
+ } else if (address_family == AF_INET) {
+ if ((payload->ifa_index == interface_id) &&
+ (payload->ifa_prefixlen < IPV4_ADDR_LEN * 8)) {
+ printf("got ip address\n");
+ memcpy(ip_address->buffer, RTA_DATA(payload + 1), IPV4_ADDR_LEN);
+ ip_address->family = AF_INET;
+ ip_address->prefix_len = IPV4_ADDR_LEN_BITS;
+ printf("returning %d\n", HICN_SOCKET_ERROR_NONE);
+ return HICN_SOCKET_ERROR_NONE;
+ }
+ } else {
+ return -99;
+ }
+ }
+
+ERR_NL:
+ERR_RECV:
+ERR_SEND:
+ERR_SOCKET:
+ printf("error getting ip address\n");
+ return HICN_SOCKET_ERROR_UNSPEC;
+}
+
+int _nl_set_ip_addr(uint32_t interface_id, ip_address_t *ip_address) {
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ struct {
+ struct nlmsghdr hdr;
+ struct ifaddrmsg payload;
+ } msg = {
+ .hdr.nlmsg_type = RTM_NEWADDR,
+ .hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | NLM_F_MATCH | NLM_F_ATOMIC,
+ .hdr.nlmsg_seq = seq++,
+ .payload.ifa_family = ip_address->family,
+ .payload.ifa_prefixlen = ip_address->prefix_len,
+ .payload.ifa_flags = 0,
+ .payload.ifa_scope = RT_SCOPE_UNIVERSE,
+ .payload.ifa_index = interface_id};
+
+ /* Set attributes = length/type/value */
+ struct rtattr ifa_address = {RTA_LENGTH(ip_address_len(ip_address)),
+ IFA_ADDRESS};
+ // XXX maybe the reason why we have a local route ?
+ // struct rtattr ifa_local = { RTA_LENGTH(ip_address_len(ip_address)),
+ // IFA_LOCAL };
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ {&ifa_address, sizeof(ifa_address)},
+ {(void *)&ip_address->buffer, sizeof(ip_address->buffer)},
+ // { &ifa_local, sizeof(ifa_local) },
+ // { (void*)&ip_address->buffer, sizeof(ip_address->buffer) },
+ };
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR_SOCKET;
+ }
+
+ // hicn_packet_dump_iov(iov, ARRAY_SIZE(iov));
+
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR_SEND;
+ }
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR_RECV;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR_NL;
+ }
+ }
+
+ return 0;
+
+ERR_NL:
+ERR_RECV:
+ERR_SEND:
+ERR_SOCKET:
+ return -1;
+}
+
+int _nl_up_if(uint32_t interface_id) {
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR_SOCKET;
+ }
+
+ struct {
+ struct nlmsghdr hdr;
+ struct ifinfomsg payload;
+ } msg = {
+ .hdr.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg)),
+ .hdr.nlmsg_type = RTM_NEWLINK,
+ .hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
+ .payload.ifi_family = AF_UNSPEC,
+ .payload.ifi_index = interface_id,
+ .payload.ifi_flags = IFF_UP,
+ .payload.ifi_change = IFF_UP // 0xffffffff
+ };
+
+ n = send(fd, &msg, sizeof(msg), 0);
+ if (n == -1) {
+ goto ERR_SEND;
+ }
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR_RECV;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR_NL;
+ }
+ return 0;
+ }
+
+ERR_NL:
+ERR_RECV:
+ERR_SEND:
+ERR_SOCKET:
+ return -1;
+}
+
+struct route_info {
+ char *dst_addr;
+ char *src_addr;
+ char *gateway;
+ char ifName[IF_NAMESIZE];
+};
+
+/*
+ * ip -6 route add PREFIX dev INTERFACE_NAME
+ */
+#if 0
+int _nl_add_in_route(const char * prefix, const uint32_t interface_id)
+{
+ char buffer[BUFSIZE];
+ struct nlmsghdr * hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ int pton_fd;
+ unsigned char dst[sizeof(struct in6_addr)];
+ char * p;
+ char * eptr;
+ char addr[strlen(prefix)];
+ uint32_t dst_len;
+
+ strncpy(addr, prefix, strlen(prefix));
+
+ p = strchr(addr, '/');
+ if (!p) {
+ dst_len = IPV6_ADDR_LEN;
+ } else {
+ dst_len = strtoul(p + 1, &eptr, 10);
+ if (dst_len > IPV6_ADDR_LEN * 8) {
+ printf("E: Netmask > IPV6_ADDR_LEN");
+ return -1;
+ }
+ *p = 0;
+ }
+
+ pton_fd = inet_pton(AF_INET6, addr, dst);
+ if (pton_fd <= 0) {
+ if (pton_fd == 0)
+ ;//ERROR("Not in presentation format");
+ else
+ perror("inet_pton");
+ return -2;
+ }
+
+ _nl_header(RTM_NEWROUTE, (uint8_t *)buffer, BUFSIZE, FLAGS_CREATE_MATCH);
+ _nl_payload_route(RT_TABLE_MAIN, dst_len, (uint8_t *)buffer, BUFSIZE);
+
+ addAttr(hdr, BUFSIZE, RTA_DST, dst, IPV6_ADDR_LEN);
+ addAttr(hdr, BUFSIZE, RTA_OIF, (void*)&interface_id, sizeof(uint32_t));
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR_SOCKET;
+ }
+
+ n = send(fd, buffer, hdr->nlmsg_len, 0);
+ if (n == -1) {
+ goto ERR_SEND;
+ }
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR_RECV;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr * err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR_NL;
+ }
+ return 0;
+ }
+
+ERR_NL:
+ERR_RECV:
+ERR_SEND:
+ERR_SOCKET:
+ return -1;
+
+}
+#endif
+
+/*
+ * ip -6 route add local default via GATEWAY_IP table TABLE_ID
+ */
+int _nl_add_out_route(const char *gateway, uint8_t address_family,
+ const uint8_t table_id, int default_route) {
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ int pton_fd;
+
+ if (address_family == AF_INET) {
+ struct in_addr gw;
+
+ pton_fd = inet_pton(AF_INET, gateway, (struct in_addr *)&gw);
+ if (pton_fd < 0) {
+ return -1;
+ }
+
+ _nl_header(RTM_NEWROUTE, (uint8_t *)buffer, BUFSIZE,
+ NLM_F_REQUEST | NLM_F_ACK | NLM_F_MATCH | NLM_F_ATOMIC);
+ _nl_payload_route(table_id, address_family, 0, (uint8_t *)buffer, BUFSIZE);
+
+ /* gw */
+ addAttr(hdr, BUFSIZE, RTA_GATEWAY, &gw, sizeof(gw));
+
+ } else if (address_family == AF_INET6) {
+ struct in6_addr gw;
+
+ pton_fd = inet_pton(AF_INET6, gateway, (struct in6_addr *)&gw);
+ if (pton_fd < 0) {
+ return -1;
+ }
+
+ _nl_header(RTM_NEWROUTE, (uint8_t *)buffer, BUFSIZE,
+ NLM_F_REQUEST | NLM_F_ACK | NLM_F_MATCH | NLM_F_ATOMIC);
+ _nl_payload_route(table_id, address_family, 0, (uint8_t *)buffer, BUFSIZE);
+
+ /* gw */
+ addAttr(hdr, BUFSIZE, RTA_GATEWAY, &gw, sizeof(gw));
+ if (default_route != -1) {
+ addAttr(hdr, BUFSIZE, RTA_OIF, &default_route, sizeof(default_route));
+ }
+
+ } else {
+ return -1;
+ }
+
+ // For more than 255 tables
+ // addAttr(msg, BUFSIZE, RTA_TABLE, &table_id, sizeof(uint32_t));
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR_SOCKET;
+ }
+
+ n = send(fd, buffer, hdr->nlmsg_len, 0);
+ if (n == -1) {
+ goto ERR_SEND;
+ }
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR_RECV;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR_NL;
+ }
+ return 0;
+ }
+
+ERR_NL:
+ERR_RECV:
+ERR_SEND:
+ERR_SOCKET:
+ return -1;
+}
+
+/*
+ * ip -6 route del local default via GATEWAY_IP table TABLE_ID
+ */
+int _nl_del_out_route(const char *gateway, const uint8_t address_family,
+ const uint8_t table_id) {
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ int pton_fd;
+
+ if (address_family == AF_INET) {
+ struct in_addr gw;
+
+ pton_fd = inet_pton(AF_INET, gateway, (struct in_addr *)&gw);
+ if (pton_fd < 0) {
+ return -1;
+ }
+
+ _nl_header(RTM_DELROUTE, (uint8_t *)buffer, BUFSIZE,
+ NLM_F_REQUEST | NLM_F_ACK | NLM_F_MATCH | NLM_F_ATOMIC);
+ _nl_payload_route(table_id, address_family, 0, (uint8_t *)buffer, BUFSIZE);
+
+ /* gw */
+ addAttr(hdr, BUFSIZE, RTA_GATEWAY, &gw, sizeof(gw));
+
+ } else if (address_family == AF_INET6) {
+ struct in6_addr gw;
+
+ pton_fd = inet_pton(AF_INET6, gateway, (struct in6_addr *)&gw);
+ if (pton_fd < 0) {
+ return -1;
+ }
+
+ _nl_header(RTM_DELROUTE, (uint8_t *)buffer, BUFSIZE,
+ NLM_F_REQUEST | NLM_F_ACK | NLM_F_MATCH | NLM_F_ATOMIC);
+ _nl_payload_route(table_id, address_family, 0, (uint8_t *)buffer, BUFSIZE);
+
+ /* gw */
+ addAttr(hdr, BUFSIZE, RTA_GATEWAY, &gw, sizeof(gw));
+
+ } else {
+ return -1;
+ }
+
+ // For more than 255 tables
+ // addAttr(msg, BUFSIZE, RTA_TABLE, &table_id, sizeof(uint32_t));
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR_SOCKET;
+ }
+
+ n = send(fd, buffer, hdr->nlmsg_len, 0);
+ if (n == -1) {
+ goto ERR_SEND;
+ }
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR_RECV;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR_NL;
+ }
+ return 0;
+ }
+
+ERR_NL:
+ERR_RECV:
+ERR_SEND:
+ERR_SOCKET:
+ return -1;
+}
+
+/*
+ * ip route del 1:2::2 dev lo table local
+ *
+ */
+int _nl_del_lo_route(const ip_address_t *ip_address) {
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ struct {
+ struct nlmsghdr hdr;
+ struct rtmsg payload;
+ } msg = {
+ .hdr.nlmsg_type = RTM_DELROUTE,
+ .hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK,
+ .hdr.nlmsg_seq = seq++,
+ .payload.rtm_family = ip_address->family,
+ .payload.rtm_dst_len = ip_address->prefix_len,
+ .payload.rtm_src_len = 0,
+ .payload.rtm_tos = 0,
+ .payload.rtm_table = RT_TABLE_LOCAL,
+ .payload.rtm_protocol = RTPROT_UNSPEC,
+ .payload.rtm_scope = RT_SCOPE_UNIVERSE,
+ .payload.rtm_type = RTN_UNSPEC,
+ .payload.rtm_flags = 0 // RTM_F_NOTIFY in 'ip route get'
+ };
+
+ /* Set attribute = length/type/value */
+ uint32_t one = 1;
+ struct rtattr a_dst = {RTA_LENGTH(ip_address_len(ip_address)), RTA_DST};
+ struct rtattr a_ifid_lo = {RTA_LENGTH(sizeof(uint32_t)), RTA_OIF};
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ /* Ip address */
+ {&a_dst, sizeof(a_dst)},
+ {(void *)&ip_address->buffer, ip_address_len(ip_address)},
+ /* Interface id */
+ {&a_ifid_lo, sizeof(a_ifid_lo)},
+ {&one, sizeof(one)}};
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR;
+ }
+
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR;
+ }
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR;
+ }
+ return 0;
+ }
+
+ return HICN_SOCKET_ERROR_NONE;
+ERR:
+ return HICN_SOCKET_ERROR_UNSPEC;
+}
+
+/*
+ * ip -6 rule add iif INTERFACE_NAME lookup TABLE_ID
+ */
+int _nl_add_rule(const char *interface_name, uint8_t address_family,
+ const uint8_t table_id) {
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ _nl_header(RTM_NEWRULE, (uint8_t *)buffer, BUFSIZE, FLAGS_CREATE);
+ _nl_payload_rule(table_id, address_family, (uint8_t *)buffer, BUFSIZE);
+
+ /* XXX iif */
+ addAttr(hdr, BUFSIZE, FRA_IIFNAME, (void *)interface_name,
+ strlen(interface_name));
+ // attr1 = addNestedAttr(hdr, IFLA_LINKINFO);
+ // endNestedAttr(hdr, attr1);
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR_SOCKET;
+ }
+
+ n = send(fd, buffer, hdr->nlmsg_len, 0);
+ if (n == -1) {
+ goto ERR_SEND;
+ }
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR_RECV;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR_NL;
+ }
+ return 0;
+ }
+
+ERR_NL:
+ERR_RECV:
+ERR_SEND:
+ERR_SOCKET:
+ return -1;
+}
+
+/*
+ * ip -6 rule del iif INTERFACE_NAME //lookup TABLE_ID
+ */
+int _nl_del_rule(const char *interface_name, uint8_t address_family,
+ const uint8_t table_id) {
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+ size_t n;
+ int fd;
+
+ _nl_header(RTM_DELRULE, (uint8_t *)buffer, BUFSIZE, FLAGS_CREATE);
+ _nl_payload_rule(table_id, address_family, (uint8_t *)buffer, BUFSIZE);
+
+ /* XXX iif */
+ addAttr(hdr, BUFSIZE, FRA_IIFNAME, (void *)interface_name,
+ strlen(interface_name));
+
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR_SOCKET;
+ }
+
+ n = send(fd, buffer, hdr->nlmsg_len, 0);
+ if (n == -1) {
+ goto ERR_SEND;
+ }
+
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR_RECV;
+ }
+
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR_NL;
+ }
+ return 0;
+ }
+
+ERR_NL:
+ERR_RECV:
+ERR_SEND:
+ERR_SOCKET:
+ return -1;
+}
+
+/*
+ * ip -6 neigh add proxy 1:2::2 dev hicnc-cons-eth0 2>&1 | grep nei
+ *
+ */
+int _nl_add_neigh_proxy(const ip_address_t *ip_address,
+ const uint32_t interface_id) {
+ /* Buffer for holding the response, with appropriate casting on the header */
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+
+ /* Used for send and receive operations on netlink socket */
+ int fd;
+ size_t n;
+
+ /* Packet header */
+ struct {
+ struct nlmsghdr hdr;
+ struct ndmsg payload;
+ } msg = {
+ .hdr.nlmsg_type = RTM_NEWNEIGH,
+ .hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK | NLM_F_EXCL,
+ .hdr.nlmsg_seq = seq++,
+ .payload.ndm_family = ip_address->family,
+ .payload.ndm_ifindex = interface_id,
+ .payload.ndm_state = NUD_PERMANENT,
+ .payload.ndm_flags = NTF_PROXY,
+ };
+
+ /* Message attributes = length/type/value */
+ struct rtattr a_dst = {RTA_LENGTH(ip_address_len(ip_address)), NDA_DST};
+
+ /* Iovec describing the packets */
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ /* Ip address */
+ {&a_dst, sizeof(a_dst)},
+ {(void *)&ip_address->buffer, sizeof(ip_address->buffer)},
+ };
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ /* Open netlink socket */
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR;
+ }
+
+ /* Send packet */
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR;
+ }
+
+ /* Receive answer */
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR;
+ }
+
+ /* Parse answer */
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR;
+ }
+ }
+
+ return HICN_SOCKET_ERROR_NONE;
+ERR:
+ return HICN_SOCKET_ERROR_UNSPEC;
+}
+
+/* ip -6 route add 0:1::/64 dev hicn-if0 table 100 */
+/* ip -6 route add 0:2::/64 dev hicn-if1 table 100 */
+int _nl_add_in_route_table(const ip_address_t *prefix,
+ const uint32_t interface_id,
+ const uint8_t table_id) {
+ /* Buffer for holding the response, with appropriate casting on the header */
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+
+ /* Used for send and receive operations on netlink socket */
+ int fd;
+ size_t n;
+
+ /* Packet header */
+ struct {
+ struct nlmsghdr hdr;
+ struct rtmsg payload;
+ } msg = {
+ .hdr.nlmsg_type = RTM_NEWROUTE,
+ .hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK | NLM_F_EXCL,
+ .hdr.nlmsg_seq = seq++,
+ .payload.rtm_family = prefix->family,
+ .payload.rtm_dst_len = prefix->prefix_len, // XXX ? XXX dst_len,
+ .payload.rtm_src_len = 0,
+ .payload.rtm_tos = 0,
+ .payload.rtm_table = table_id, /* RT_TABLE_MAIN, etc. */
+ .payload.rtm_protocol = RTPROT_BOOT,
+ .payload.rtm_scope =
+ prefix->family == AF_INET6 ? RT_SCOPE_UNIVERSE : RT_SCOPE_LINK,
+ .payload.rtm_type = RTN_UNICAST,
+ .payload.rtm_flags = 0,
+ };
+
+ /* Message attributes = length/type/value */
+ // XXX This could be put directly inside the iovec maybe ? XXX
+ struct rtattr a_dst = {RTA_LENGTH(ip_address_len(prefix)), RTA_DST};
+ struct rtattr a_oif = {RTA_LENGTH(sizeof(uint32_t)), RTA_OIF};
+
+ /* Iovec describing the packets */
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ /* Destination prefix / ip address */
+ {&a_dst, sizeof(a_dst)},
+ {(void *)&prefix->buffer, ip_address_len(prefix)},
+ /* Output interface */
+ {&a_oif, sizeof(a_oif)},
+ {(void *)&interface_id, sizeof(uint32_t)},
+ };
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ /* Open netlink socket */
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR;
+ }
+
+ /* Send packet */
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR;
+ }
+
+ /* Receive answer */
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR;
+ }
+
+ /* Parse answer */
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR;
+ }
+ }
+
+ return HICN_SOCKET_ERROR_NONE;
+ERR:
+ return HICN_SOCKET_ERROR_UNSPEC;
+}
+
+/* Additional helper functions */
+
+int _nl_add_in_route_table_s(const char *prefix, const uint32_t interface_id,
+ const uint8_t table_id) {
+ int rc;
+ ip_address_t ip_address;
+
+ rc = hicn_ip_pton(prefix, &ip_address);
+ if (rc < 0) {
+ return rc;
+ }
+
+ return _nl_add_in_route_table(&ip_address, interface_id, table_id);
+}
+
+int _nl_add_in_route_s(const char *prefix, const uint32_t interface_id) {
+ return _nl_add_in_route_table_s(prefix, interface_id, RT_TABLE_MAIN);
+}
+
+////////* ip -6 rule add from all prio 10 table local */
+/* ip -6 rule add from b001::/16 prio 0 table 100 */
+int _nl_add_prio_rule(const ip_address_t *ip_address, uint8_t address_family,
+ const uint32_t priority, const uint8_t table_id) {
+ /* Buffer for holding the response, with appropriate casting on the header */
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+
+ /* Used for send and receive operations on netlink socket */
+ int fd;
+ size_t n;
+
+ /* Packet header */
+ struct {
+ struct nlmsghdr hdr;
+ struct fib_rule_hdr payload;
+ } msg = {
+ .hdr.nlmsg_type = RTM_NEWRULE,
+ .hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK | NLM_F_EXCL,
+ .hdr.nlmsg_seq = seq++,
+ .payload.family = address_family,
+ //.payload.dst_len = ,
+ .payload.src_len = ip_address ? ip_address->prefix_len : 0,
+ .payload.tos = 0,
+ .payload.table = table_id,
+ .payload.action = FR_ACT_TO_TBL,
+ .payload.flags = NLM_F_REPLACE, // 0
+ };
+
+ /* Open netlink socket */
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR;
+ }
+
+ if (ip_address) {
+ /* Message attributes = length/type/value */
+ struct rtattr a_src = {RTA_LENGTH(ip_address_len(ip_address)), FRA_SRC};
+ struct rtattr a_prio = {RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY};
+
+ /* Iovec describing the packets */
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ /* Source prefix / ip_address */
+ {&a_src, sizeof(a_src)},
+ {(void *)&ip_address->buffer, ip_address_len(ip_address)},
+ /* Priority */
+ {&a_prio, sizeof(a_prio)},
+ {(void *)&priority, sizeof(uint32_t)},
+ };
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ /* Send packet */
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR;
+ }
+ } else {
+ struct rtattr a_prio = {RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY};
+
+ /* Iovec describing the packets */
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ /* Priority */
+ {&a_prio, sizeof(a_prio)},
+ {(void *)&priority, sizeof(uint32_t)},
+ };
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ /* Send packet */
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR;
+ }
+ }
+
+ /* Receive answer */
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR;
+ }
+
+ /* Parse answer */
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0) {
+ errno = -err->error;
+ goto ERR;
+ }
+ }
+
+ return HICN_SOCKET_ERROR_NONE;
+ERR:
+ return HICN_SOCKET_ERROR_UNSPEC;
+}
+
+int _nl_add_lo_prio_rule(const ip_address_t *ip_address, uint8_t address_family,
+ const uint32_t priority) {
+ return _nl_add_prio_rule(ip_address, address_family, priority,
+ RT_TABLE_LOCAL);
+}
+
+/* ip -6 rule del from all prio 0 table local */
+int _nl_del_prio_rule(const ip_address_t *ip_address, uint8_t address_family,
+ const uint32_t priority, const uint8_t table_id) {
+ /* Buffer for holding the response, with appropriate casting on the header */
+ char buffer[BUFSIZE];
+ struct nlmsghdr *hdr = (struct nlmsghdr *)buffer;
+
+ /* Used for send and receive operations on netlink socket */
+ int fd;
+ size_t n;
+
+ /* Packet header */
+ struct {
+ struct nlmsghdr hdr;
+ struct fib_rule_hdr payload;
+ } msg = {
+ .hdr.nlmsg_type = RTM_DELRULE,
+ .hdr.nlmsg_flags = NLM_F_REQUEST | NLM_F_CREATE | NLM_F_ACK | NLM_F_EXCL,
+ .hdr.nlmsg_seq = seq++,
+ .payload.family = address_family,
+ //.payload.dst_len = ,
+ .payload.src_len = ip_address ? ip_address->prefix_len : 0,
+ .payload.tos = 0,
+ .payload.table = table_id,
+ .payload.action = FR_ACT_TO_TBL,
+ .payload.flags = NLM_F_REPLACE, // 0
+ };
+
+ /* Open netlink socket */
+ fd = socket(AF_NETLINK, SOCK_DGRAM, NETLINK_ROUTE);
+ if (fd < 0) {
+ goto ERR;
+ }
+
+ /* Message attributes = length/type/value */
+ if (ip_address) {
+ struct rtattr a_src = {RTA_LENGTH(ip_address_len(ip_address)), FRA_SRC};
+ struct rtattr a_prio = {RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY};
+
+ /* Iovec describing the packets */
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ /* Source prefix / ip_address */
+ {&a_src, sizeof(a_src)},
+ {(void *)&ip_address->buffer, ip_address_len(ip_address)},
+ /* Priority */
+ {&a_prio, sizeof(a_prio)},
+ {(void *)&priority, sizeof(uint32_t)},
+ };
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ /* Send packet */
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR;
+ }
+
+ } else {
+ struct rtattr a_prio = {RTA_LENGTH(sizeof(uint32_t)), FRA_PRIORITY};
+
+ /* Iovec describing the packets */
+ struct iovec iov[] = {
+ {&msg, sizeof(msg)},
+ /* Priority */
+ {&a_prio, sizeof(a_prio)},
+ {(void *)&priority, sizeof(uint32_t)},
+ };
+ msg.hdr.nlmsg_len = iov_length(iov, ARRAY_SIZE(iov));
+
+ /* Send packet */
+ n = writev(fd, (struct iovec *)&iov, ARRAY_SIZE(iov));
+ if (n == -1) {
+ goto ERR;
+ }
+ }
+
+ /* Receive answer */
+ n = recv(fd, buffer, BUFSIZE, 0);
+ if (n == -1) {
+ goto ERR;
+ }
+
+ /* Parse answer */
+ if (hdr->nlmsg_type == NLMSG_ERROR) {
+ struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(hdr);
+ if (err->error < 0 &&
+ err->error != -2) { //-2 is not such file or directory
+ errno = -err->error;
+ goto ERR;
+ }
+ }
+
+ return HICN_SOCKET_ERROR_NONE;
+ERR:
+ return HICN_SOCKET_ERROR_UNSPEC;
+}
+
+int _nl_del_lo_prio_rule(const ip_address_t *ip_address, uint8_t address_family,
+ const uint32_t priority) {
+ return _nl_del_prio_rule(ip_address, address_family, priority,
+ RT_TABLE_LOCAL);
+}
+
+/******************************************************************************/
+
+// #include <net/if.h>
+// duplicate declarations, in the meantime
+#define IF_NAMESIZE 16
+
+//#define WITH_TUN_PI 1
+
+#ifdef WITH_TUN_PI
+#define TUN_FLAGS IFF_TUN
+#else
+#define TUN_FLAGS IFF_TUN | IFF_NO_PI
+#endif
+
+/*
+ * Taken from Kernel Documentation/networking/tuntap.txt
+ */
+
+int tun_alloc(char *dev, int flags) {
+ struct ifreq ifr;
+ int fd, err;
+ char *clonedev = "/dev/net/tun";
+
+ /* Arguments taken by the function:
+ *
+ * char *dev: the name of an interface (or '\0'). MUST have enough
+ * space to hold the interface name if '\0' is passed
+ * int flags: interface flags (eg, IFF_TUN etc.)
+ */
+
+ /* open the clone device */
+ if ((fd = open(clonedev, O_RDWR)) < 0) {
+ return fd;
+ }
+
+ /* preparation of the struct ifr, of type "struct ifreq" */
+ memset(&ifr, 0, sizeof(ifr));
+
+ ifr.ifr_flags = flags;
+
+ if (*dev) {
+ /* if a device name was specified, put it in the structure; otherwise,
+ * the kernel will try to allocate the "next" device of the
+ * specified type */
+ strncpy(ifr.ifr_name, dev, IF_NAMESIZE - 1);
+ }
+
+ /* try to create the device */
+ if ((err = ioctl(fd, TUNSETIFF, (void *)&ifr)) < 0) {
+ close(fd);
+ return err;
+ }
+
+ /* if the operation was successful, write back the name of the
+ * interface to the variable "dev", so the caller can know
+ * it. Note that the caller MUST reserve space in *dev (see calling
+ * code below) */
+ strcpy(dev, ifr.ifr_name);
+
+ /* this is the special file descriptor that the caller will use to talk
+ * with the virtual interface */
+ return fd;
+}
+
+int linux_get_tun_name(const char *prefix, const char *identifier,
+ char *tun_name) {
+ snprintf(tun_name, IF_NAMESIZE, "%s-%s", prefix,
+ identifier ? identifier : "main");
+ return 0;
+}
+
+int linux_tun_enable_offload(int fd) {
+ unsigned int offload = 0, tso4 = 1, tso6 = 1, ecn = 1, ufo = 1, csum = 1;
+
+ /* Check if our kernel supports TUNSETOFFLOAD */
+ if (ioctl(fd, TUNSETOFFLOAD, 0) != 0 && errno == EINVAL) {
+ goto ERR_TUN;
+ }
+
+ if (csum) {
+ offload |= TUN_F_CSUM;
+ if (tso4) offload |= TUN_F_TSO4;
+ if (tso6) offload |= TUN_F_TSO6;
+ if ((tso4 || tso6) && ecn) offload |= TUN_F_TSO_ECN;
+ if (ufo) offload |= TUN_F_UFO;
+ }
+
+ if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
+ offload &= ~TUN_F_UFO;
+ if (ioctl(fd, TUNSETOFFLOAD, offload) != 0) {
+ fprintf(stderr, "TUNSETOFFLOAD ioctl() failed: %s\n", strerror(errno));
+ }
+ }
+
+ return 0;
+
+ERR_TUN:
+ return -1;
+}
+
+int linux_tun_create(char *name) {
+ int fd, rc;
+
+ fd = tun_alloc(name, TUN_FLAGS);
+ if (fd < 0) {
+ // ERROR("Error connecting to tun/tap interface %s!", name);
+ errno = -2;
+ goto ERR_TUN;
+ }
+
+ rc = linux_tun_enable_offload(fd);
+ if (rc < 0) {
+ // WARN("Could not enable hardware offload on TUN device");
+ } else {
+ // INFO("Enabled hardware offload on TUN device");
+ }
+
+ return fd;
+
+ERR_TUN:
+ return -1;
+}
+
+/*
+ *
+ * interface name can be NULL for all interfaces
+ */
+int linux_enable_proc(char *path) {
+ int ret = 0;
+ int fd;
+
+ fd = open(path, O_WRONLY);
+ if (fd < 0) {
+ return -1;
+ }
+
+ if (write(fd, "1", 1) != 1) {
+ ret = -2;
+ }
+
+ close(fd);
+ return ret;
+}
+
+int linux_enable_v4_forwarding() {
+ return linux_enable_proc("/proc/sys/net/ipv4/ip_forward");
+}
+
+int linux_enable_v6_forwarding(char *interface_name) {
+ char path[PATH_MAX];
+ snprintf(path, PATH_MAX, "/proc/sys/net/ipv6/conf/%s/forwarding",
+ (interface_name) ? interface_name : "all");
+
+ return linux_enable_proc(path);
+}
+
+int linux_enable_ndp_proxy() {
+ return linux_enable_proc("/proc/sys/net/ipv6/conf/all/proxy_ndp");
+}
+
+const hicn_socket_ops_t ops = {
+ .arch = "linux",
+ .get_tun_name = linux_get_tun_name,
+ .tun_create = linux_tun_create,
+ .enable_v4_forwarding = linux_enable_v4_forwarding,
+ .enable_v6_forwarding = linux_enable_v6_forwarding,
+ .enable_ndp_proxy = linux_enable_ndp_proxy,
+ .get_ifid = _nl_get_ifid,
+ .get_output_ifid = _nl_get_output_ifid,
+ .get_ip_addr = _nl_get_ip_addr,
+ .set_ip_addr = _nl_set_ip_addr,
+ .up_if = _nl_up_if,
+ .add_in_route_table = _nl_add_in_route_table,
+ .add_in_route_table_s = _nl_add_in_route_table_s,
+ .add_in_route_s = _nl_add_in_route_s,
+ .add_out_route = _nl_add_out_route,
+ .del_out_route = _nl_del_out_route,
+ .del_lo_route = _nl_del_lo_route,
+ .add_rule = _nl_add_rule,
+ .del_rule = _nl_del_rule,
+ .add_neigh_proxy = _nl_add_neigh_proxy,
+ .add_prio_rule = _nl_add_prio_rule,
+ .add_lo_prio_rule = _nl_add_lo_prio_rule,
+ .del_prio_rule = _nl_del_prio_rule,
+ .del_lo_prio_rule = _nl_del_lo_prio_rule,
+};