diff options
Diffstat (limited to 'src/libsystemd-network/test-ndisc-send.c')
| -rw-r--r-- | src/libsystemd-network/test-ndisc-send.c | 449 |
1 files changed, 449 insertions, 0 deletions
diff --git a/src/libsystemd-network/test-ndisc-send.c b/src/libsystemd-network/test-ndisc-send.c new file mode 100644 index 0000000..1b1b27d --- /dev/null +++ b/src/libsystemd-network/test-ndisc-send.c @@ -0,0 +1,449 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include <getopt.h> + +#include "build.h" +#include "ether-addr-util.h" +#include "fd-util.h" +#include "hexdecoct.h" +#include "icmp6-util.h" +#include "in-addr-util.h" +#include "main-func.h" +#include "ndisc-option.h" +#include "netlink-util.h" +#include "network-common.h" +#include "parse-util.h" +#include "socket-util.h" +#include "strv.h" +#include "time-util.h" + +static int arg_ifindex = 0; +static int arg_icmp6_type = 0; +static union in_addr_union arg_dest = IN_ADDR_NULL; +static uint8_t arg_hop_limit = 0; +static uint8_t arg_ra_flags = 0; +static uint8_t arg_preference = false; +static usec_t arg_lifetime = 0; +static usec_t arg_reachable = 0; +static usec_t arg_retransmit = 0; +static uint32_t arg_na_flags = 0; +static union in_addr_union arg_target_address = IN_ADDR_NULL; +static union in_addr_union arg_redirect_destination = IN_ADDR_NULL; +static bool arg_set_source_mac = false; +static struct ether_addr arg_source_mac = {}; +static bool arg_set_target_mac = false; +static struct ether_addr arg_target_mac = {}; +static struct ip6_hdr *arg_redirected_header = NULL; +static bool arg_set_mtu = false; +static uint32_t arg_mtu = 0; + +STATIC_DESTRUCTOR_REGISTER(arg_redirected_header, freep); + +static int parse_icmp6_type(const char *str) { + if (STR_IN_SET(str, "router-solicit", "rs", "RS")) + return ND_ROUTER_SOLICIT; + if (STR_IN_SET(str, "router-advertisement", "ra", "RA")) + return ND_ROUTER_ADVERT; + if (STR_IN_SET(str, "neighbor-solicit", "ns", "NS")) + return ND_NEIGHBOR_SOLICIT; + if (STR_IN_SET(str, "neighbor-advertisement", "na", "NA")) + return ND_NEIGHBOR_ADVERT; + if (STR_IN_SET(str, "redirect", "rd", "RD")) + return ND_REDIRECT; + return -EINVAL; +} + +static int parse_preference(const char *str) { + if (streq(str, "low")) + return SD_NDISC_PREFERENCE_LOW; + if (streq(str, "medium")) + return SD_NDISC_PREFERENCE_MEDIUM; + if (streq(str, "high")) + return SD_NDISC_PREFERENCE_HIGH; + if (streq(str, "reserved")) + return SD_NDISC_PREFERENCE_RESERVED; + return -EINVAL; +} + +static int parse_argv(int argc, char *argv[]) { + enum { + ARG_VERSION = 0x100, + ARG_RA_HOP_LIMIT, + ARG_RA_MANAGED, + ARG_RA_OTHER, + ARG_RA_HOME_AGENT, + ARG_RA_PREFERENCE, + ARG_RA_LIFETIME, + ARG_RA_REACHABLE, + ARG_RA_RETRANSMIT, + ARG_NA_ROUTER, + ARG_NA_SOLICITED, + ARG_NA_OVERRIDE, + ARG_TARGET_ADDRESS, + ARG_REDIRECT_DESTINATION, + ARG_OPTION_SOURCE_LL, + ARG_OPTION_TARGET_LL, + ARG_OPTION_REDIRECTED_HEADER, + ARG_OPTION_MTU, + }; + + static const struct option options[] = { + { "version", no_argument, NULL, ARG_VERSION }, + { "interface", required_argument, NULL, 'i' }, + { "type", required_argument, NULL, 't' }, + { "dest", required_argument, NULL, 'd' }, + /* For Router Advertisement */ + { "hop-limit", required_argument, NULL, ARG_RA_HOP_LIMIT }, + { "managed", required_argument, NULL, ARG_RA_MANAGED }, + { "other", required_argument, NULL, ARG_RA_OTHER }, + { "home-agent", required_argument, NULL, ARG_RA_HOME_AGENT }, + { "preference", required_argument, NULL, ARG_RA_PREFERENCE }, + { "lifetime", required_argument, NULL, ARG_RA_LIFETIME }, + { "reachable-time", required_argument, NULL, ARG_RA_REACHABLE }, + { "retransmit-timer", required_argument, NULL, ARG_RA_RETRANSMIT }, + /* For Neighbor Advertisement */ + { "is-router", required_argument, NULL, ARG_NA_ROUTER }, + { "is-solicited", required_argument, NULL, ARG_NA_SOLICITED }, + { "is-override", required_argument, NULL, ARG_NA_OVERRIDE }, + /* For Neighbor Solicit, Neighbor Advertisement, and Redirect */ + { "target-address", required_argument, NULL, ARG_TARGET_ADDRESS }, + /* For Redirect */ + { "redirect-destination", required_argument, NULL, ARG_REDIRECT_DESTINATION }, + /* Options */ + { "source-ll-address", required_argument, NULL, ARG_OPTION_SOURCE_LL }, + { "target-ll-address", required_argument, NULL, ARG_OPTION_TARGET_LL }, + { "redirected-header", required_argument, NULL, ARG_OPTION_REDIRECTED_HEADER }, + { "mtu", required_argument, NULL, ARG_OPTION_MTU }, + {} + }; + + _cleanup_(sd_netlink_unrefp) sd_netlink *rtnl = NULL; + int c, r; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "i:t:d:", options, NULL)) >= 0) { + + switch (c) { + + case ARG_VERSION: + return version(); + + case 'i': + r = rtnl_resolve_interface_or_warn(&rtnl, optarg); + if (r < 0) + return r; + arg_ifindex = r; + break; + + case 't': + r = parse_icmp6_type(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse message type: %m"); + arg_icmp6_type = r; + break; + + case 'd': + r = in_addr_from_string(AF_INET6, optarg, &arg_dest); + if (r < 0) + return log_error_errno(r, "Failed to parse destination address: %m"); + if (!in6_addr_is_link_local(&arg_dest.in6)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), + "The destination address %s is not a link-local address.", optarg); + break; + + case ARG_RA_HOP_LIMIT: + r = safe_atou8(optarg, &arg_hop_limit); + if (r < 0) + return log_error_errno(r, "Failed to parse hop limit: %m"); + break; + + case ARG_RA_MANAGED: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse managed flag: %m"); + SET_FLAG(arg_ra_flags, ND_RA_FLAG_MANAGED, r); + break; + + case ARG_RA_OTHER: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse other flag: %m"); + SET_FLAG(arg_ra_flags, ND_RA_FLAG_OTHER, r); + break; + + case ARG_RA_HOME_AGENT: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse home-agent flag: %m"); + SET_FLAG(arg_ra_flags, ND_RA_FLAG_HOME_AGENT, r); + break; + + case ARG_RA_PREFERENCE: + r = parse_preference(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse preference: %m"); + arg_preference = r; + break; + + case ARG_RA_LIFETIME: + r = parse_sec(optarg, &arg_lifetime); + if (r < 0) + return log_error_errno(r, "Failed to parse lifetime: %m"); + break; + + case ARG_RA_REACHABLE: + r = parse_sec(optarg, &arg_reachable); + if (r < 0) + return log_error_errno(r, "Failed to parse reachable time: %m"); + break; + + case ARG_RA_RETRANSMIT: + r = parse_sec(optarg, &arg_retransmit); + if (r < 0) + return log_error_errno(r, "Failed to parse retransmit timer: %m"); + break; + + case ARG_NA_ROUTER: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse is-router flag: %m"); + SET_FLAG(arg_na_flags, ND_NA_FLAG_ROUTER, r); + break; + + case ARG_NA_SOLICITED: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse is-solicited flag: %m"); + SET_FLAG(arg_na_flags, ND_NA_FLAG_SOLICITED, r); + break; + + case ARG_NA_OVERRIDE: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse is-override flag: %m"); + SET_FLAG(arg_na_flags, ND_NA_FLAG_OVERRIDE, r); + break; + + case ARG_TARGET_ADDRESS: + r = in_addr_from_string(AF_INET6, optarg, &arg_target_address); + if (r < 0) + return log_error_errno(r, "Failed to parse target address: %m"); + break; + + case ARG_REDIRECT_DESTINATION: + r = in_addr_from_string(AF_INET6, optarg, &arg_redirect_destination); + if (r < 0) + return log_error_errno(r, "Failed to parse destination address: %m"); + break; + + case ARG_OPTION_SOURCE_LL: + r = parse_boolean(optarg); + if (r < 0) + return log_error_errno(r, "Failed to parse source LL address option: %m"); + arg_set_source_mac = r; + break; + + case ARG_OPTION_TARGET_LL: + r = parse_ether_addr(optarg, &arg_target_mac); + if (r < 0) + return log_error_errno(r, "Failed to parse target LL address option: %m"); + arg_set_target_mac = true; + break; + + case ARG_OPTION_REDIRECTED_HEADER: { + _cleanup_free_ void *p = NULL; + size_t len; + + r = unbase64mem(optarg, &p, &len); + if (r < 0) + return log_error_errno(r, "Failed to parse redirected header: %m"); + + if (len < sizeof(struct ip6_hdr)) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Invalid redirected header."); + + arg_redirected_header = TAKE_PTR(p); + break; + } + case ARG_OPTION_MTU: + r = safe_atou32(optarg, &arg_mtu); + if (r < 0) + return log_error_errno(r, "Failed to parse MTU: %m"); + arg_set_mtu = true; + break; + + case '?': + return -EINVAL; + + default: + assert_not_reached(); + } + } + + if (arg_ifindex <= 0) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--interface/-i option is mandatory."); + + if (arg_icmp6_type <= 0) + return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "--type/-t option is mandatory."); + + if (in6_addr_is_null(&arg_dest.in6)) { + if (IN_SET(arg_icmp6_type, ND_ROUTER_ADVERT, ND_NEIGHBOR_ADVERT, ND_REDIRECT)) + arg_dest.in6 = IN6_ADDR_ALL_NODES_MULTICAST; + else + arg_dest.in6 = IN6_ADDR_ALL_ROUTERS_MULTICAST; + } + + if (arg_set_source_mac) { + struct hw_addr_data hw_addr; + + r = rtnl_get_link_info(&rtnl, arg_ifindex, + /* ret_iftype = */ NULL, + /* ret_flags = */ NULL, + /* ret_kind = */ NULL, + &hw_addr, + /* ret_permanent_hw_addr = */ NULL); + if (r < 0) + return log_error_errno(r, "Failed to get the source link-layer address: %m"); + + if (hw_addr.length != sizeof(struct ether_addr)) + return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), + "Unsupported hardware address length %zu: %m", + hw_addr.length); + + arg_source_mac = hw_addr.ether; + } + + return 1; +} + +static int send_icmp6(int fd, const struct icmp6_hdr *hdr) { + _cleanup_set_free_ Set *options = NULL; + int r; + + assert(fd >= 0); + assert(hdr); + + if (arg_set_source_mac) { + r = ndisc_option_add_link_layer_address(&options, 0, SD_NDISC_OPTION_SOURCE_LL_ADDRESS, &arg_source_mac); + if (r < 0) + return r; + } + + if (arg_set_target_mac) { + r = ndisc_option_add_link_layer_address(&options, 0, SD_NDISC_OPTION_TARGET_LL_ADDRESS, &arg_target_mac); + if (r < 0) + return r; + } + + if (arg_redirected_header) { + r = ndisc_option_add_redirected_header(&options, 0, arg_redirected_header); + if (r < 0) + return r; + } + + if (arg_set_mtu) { + r = ndisc_option_add_mtu(&options, 0, arg_mtu); + if (r < 0) + return r; + } + + return ndisc_send(fd, &arg_dest.in6, hdr, options, now(CLOCK_BOOTTIME)); +} + +static int send_router_solicit(int fd) { + struct nd_router_solicit hdr = { + .nd_rs_type = ND_ROUTER_SOLICIT, + }; + + assert(fd >= 0); + + return send_icmp6(fd, &hdr.nd_rs_hdr); +} + +static int send_router_advertisement(int fd) { + struct nd_router_advert hdr = { + .nd_ra_type = ND_ROUTER_ADVERT, + .nd_ra_router_lifetime = usec_to_be16_sec(arg_lifetime), + .nd_ra_reachable = usec_to_be32_msec(arg_reachable), + .nd_ra_retransmit = usec_to_be32_msec(arg_retransmit), + }; + + assert(fd >= 0); + + /* The nd_ra_curhoplimit and nd_ra_flags_reserved fields cannot specified with nd_ra_router_lifetime + * simultaneously in the structured initializer in the above. */ + hdr.nd_ra_curhoplimit = arg_hop_limit; + hdr.nd_ra_flags_reserved = arg_ra_flags; + + return send_icmp6(fd, &hdr.nd_ra_hdr); +} + +static int send_neighbor_solicit(int fd) { + struct nd_neighbor_solicit hdr = { + .nd_ns_type = ND_NEIGHBOR_SOLICIT, + .nd_ns_target = arg_target_address.in6, + }; + + assert(fd >= 0); + + return send_icmp6(fd, &hdr.nd_ns_hdr); +} + +static int send_neighbor_advertisement(int fd) { + struct nd_neighbor_advert hdr = { + .nd_na_type = ND_NEIGHBOR_ADVERT, + .nd_na_flags_reserved = arg_na_flags, + .nd_na_target = arg_target_address.in6, + }; + + assert(fd >= 0); + + return send_icmp6(fd, &hdr.nd_na_hdr); +} + +static int send_redirect(int fd) { + struct nd_redirect hdr = { + .nd_rd_type = ND_REDIRECT, + .nd_rd_target = arg_target_address.in6, + .nd_rd_dst = arg_redirect_destination.in6, + }; + + assert(fd >= 0); + + return send_icmp6(fd, &hdr.nd_rd_hdr); +} + +static int run(int argc, char *argv[]) { + _cleanup_close_ int fd = -EBADF; + int r; + + log_setup(); + + r = parse_argv(argc, argv); + if (r <= 0) + return r; + + fd = icmp6_bind(arg_ifindex, /* is_router = */ false); + if (fd < 0) + return log_error_errno(fd, "Failed to bind socket to interface: %m"); + + switch (arg_icmp6_type) { + case ND_ROUTER_SOLICIT: + return send_router_solicit(fd); + case ND_ROUTER_ADVERT: + return send_router_advertisement(fd); + case ND_NEIGHBOR_SOLICIT: + return send_neighbor_solicit(fd); + case ND_NEIGHBOR_ADVERT: + return send_neighbor_advertisement(fd); + case ND_REDIRECT: + return send_redirect(fd); + default: + assert_not_reached(); + } + + return 0; +} + +DEFINE_MAIN_FUNCTION(run); |