sysfs should be avoided for new settings of network interfaces. To still provide a common configuration infrastructure, all the existing settings subcommands also have to be reimplemented via generic netlink while still using sysfs as fallback.
The gw_mode implementation is using the commands BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH to set/get the configuration of this feature using the attributes:
* u8 BATADV_ATTR_GW_MODE (0 == off, 1 == client, 2 == server) * u32 BATADV_ATTR_GW_BANDWIDTH_DOWN (in 100 kbit/s steps) * u32 BATADV_ATTR_GW_BANDWIDTH_UP (in 100 kbit/s steps) * u32 BATADV_ATTR_GW_SEL_CLASS - 1-255 for BATMAN_IV - 1-UINT32_MAX for BATMAN_V
Signed-off-by: Sven Eckelmann sven@narfation.org --- Cc: Marek Lindner mareklindner@neomailbox.ch Cc: Antonio Quartulli a@unstable.cc --- gw_mode.c | 275 ++++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 206 insertions(+), 69 deletions(-)
diff --git a/gw_mode.c b/gw_mode.c index 167b777..477a1ff 100644 --- a/gw_mode.c +++ b/gw_mode.c @@ -162,80 +162,233 @@ static int parse_gw(struct state *state, int argc, char *argv[]) return 0; }
-static int gw_mode(struct state *state, int argc, char **argv) +static int print_gw(struct nl_msg *msg, void *arg) { - int optchar, res = EXIT_FAILURE; - char *path_buff, gw_mode; + static const int mandatory[] = { + BATADV_ATTR_GW_MODE, + }; + static const int mandatory_client[] = { + BATADV_ATTR_ALGO_NAME, + BATADV_ATTR_GW_SEL_CLASS, + }; + static const int mandatory_server[] = { + BATADV_ATTR_GW_BANDWIDTH_DOWN, + BATADV_ATTR_GW_BANDWIDTH_UP, + }; + struct nlattr *attrs[BATADV_ATTR_MAX + 1]; + struct nlmsghdr *nlh = nlmsg_hdr(msg); + struct genlmsghdr *ghdr; + int *result = arg; + const char *algo; + uint8_t gw_mode; + uint32_t val; + uint32_t down; + uint32_t up; + + if (!genlmsg_valid_hdr(nlh, 0)) + return NL_OK; + + ghdr = nlmsg_data(nlh); + + if (nla_parse(attrs, BATADV_ATTR_MAX, genlmsg_attrdata(ghdr, 0), + genlmsg_len(ghdr), batadv_netlink_policy)) { + return NL_OK; + }
- while ((optchar = getopt(argc, argv, "h")) != -1) { - switch (optchar) { - case 'h': - gw_mode_usage(); - return EXIT_SUCCESS; - default: - gw_mode_usage(); - return EXIT_FAILURE; - } + /* ignore entry when attributes are missing */ + if (missing_mandatory_attrs(attrs, mandatory, ARRAY_SIZE(mandatory))) + return NL_OK; + + gw_mode = nla_get_u8(attrs[BATADV_ATTR_GW_MODE]); + switch (gw_mode) { + case BATADV_GW_MODE_OFF: + printf("off\n"); + break; + case BATADV_GW_MODE_CLIENT: + if (missing_mandatory_attrs(attrs, mandatory_client, + ARRAY_SIZE(mandatory_client))) + return NL_OK; + + algo = nla_data(attrs[BATADV_ATTR_ALGO_NAME]); + val = nla_get_u32(attrs[BATADV_ATTR_GW_SEL_CLASS]); + + if (strcmp(algo, "BATMAN_V") == 0) + printf("client (selection class: %u.%01u MBit)\n", + val / 10, val % 10); + else + printf("client (selection class: %u)\n", val); + break; + case BATADV_GW_MODE_SERVER: + if (missing_mandatory_attrs(attrs, mandatory_server, + ARRAY_SIZE(mandatory_server))) + return NL_OK; + + down = nla_get_u32(attrs[BATADV_ATTR_GW_BANDWIDTH_DOWN]); + up = nla_get_u32(attrs[BATADV_ATTR_GW_BANDWIDTH_UP]); + + printf("server (announced bw: %u.%01u/%u.%01u MBit)\n", + down / 10, down % 10, up / 10, up % 10); + break; + default: + printf("unknown\n"); + break; }
- path_buff = malloc(PATH_BUFF_LEN); - if (!path_buff) { - fprintf(stderr, "Error - could not allocate path buffer: out of memory ?\n"); + *result = 0; + return NL_STOP; +} + +static int get_gw(struct state *state) +{ + return sys_simple_nlquery(state, BATADV_CMD_GET_MESH, NULL, print_gw); +} + +static int set_attrs_gw(struct nl_msg *msg, void *arg __maybe_unused) +{ + nla_put_u8(msg, BATADV_ATTR_GW_MODE, gw_globals.mode); + + if (gw_globals.bandwidth_down_found) + nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_DOWN, + gw_globals.bandwidth_down); + + if (gw_globals.bandwidth_up_found) + nla_put_u32(msg, BATADV_ATTR_GW_BANDWIDTH_UP, + gw_globals.bandwidth_up); + + if (gw_globals.sel_class_found) + nla_put_u32(msg, BATADV_ATTR_GW_SEL_CLASS, + gw_globals.sel_class); + + return 0; +} + +static int set_gw(struct state *state) +{ + return sys_simple_nlquery(state, BATADV_CMD_SET_MESH, set_attrs_gw, + NULL); +} + +static int gw_read_setting(struct state *state, const char *path_buff) +{ + enum batadv_gw_modes gw_mode; + int res; + + res = get_gw(state); + if (res < 0 && res != -EOPNOTSUPP) return EXIT_FAILURE; + if (res >= 0) + return EXIT_SUCCESS; + + /* fallback to sysfs */ + res = read_file(path_buff, SYS_GW_MODE, USE_READ_BUFF, 0, 0, 0); + if (res != EXIT_SUCCESS) + goto out; + + if (line_ptr[strlen(line_ptr) - 1] == '\n') + line_ptr[strlen(line_ptr) - 1] = '\0'; + + if (strcmp(line_ptr, "client") == 0) + gw_mode = BATADV_GW_MODE_CLIENT; + else if (strcmp(line_ptr, "server") == 0) + gw_mode = BATADV_GW_MODE_SERVER; + else + gw_mode = BATADV_GW_MODE_OFF; + + free(line_ptr); + line_ptr = NULL; + + switch (gw_mode) { + case BATADV_GW_MODE_CLIENT: + res = read_file(path_buff, SYS_GW_SEL, USE_READ_BUFF, 0, 0, 0); + break; + case BATADV_GW_MODE_SERVER: + res = read_file(path_buff, SYS_GW_BW, USE_READ_BUFF, 0, 0, 0); + break; + default: + printf("off\n"); + goto out; }
- snprintf(path_buff, PATH_BUFF_LEN, SYS_BATIF_PATH_FMT, state->mesh_iface); + if (res != EXIT_SUCCESS) + goto out;
- if (argc == 1) { - res = read_file(path_buff, SYS_GW_MODE, USE_READ_BUFF, 0, 0, 0); + if (line_ptr[strlen(line_ptr) - 1] == '\n') + line_ptr[strlen(line_ptr) - 1] = '\0';
- if (res != EXIT_SUCCESS) - goto out; + switch (gw_mode) { + case BATADV_GW_MODE_CLIENT: + printf("client (selection class: %s)\n", line_ptr); + break; + case BATADV_GW_MODE_SERVER: + printf("server (announced bw: %s)\n", line_ptr); + break; + default: + goto out; + }
- if (line_ptr[strlen(line_ptr) - 1] == '\n') - line_ptr[strlen(line_ptr) - 1] = '\0'; +out: + free(line_ptr); + line_ptr = NULL;
- if (strcmp(line_ptr, "client") == 0) - gw_mode = BATADV_GW_MODE_CLIENT; - else if (strcmp(line_ptr, "server") == 0) - gw_mode = BATADV_GW_MODE_SERVER; - else - gw_mode = BATADV_GW_MODE_OFF; + return res; +} + +static int gw_write_setting(struct state *state, const char *path_buff, + int argc, char *argv[]) +{ + int res = EXIT_FAILURE; + + res = set_gw(state); + if (res < 0 && res != -EOPNOTSUPP) + return EXIT_FAILURE; + if (res >= 0) + return EXIT_SUCCESS;
- free(line_ptr); - line_ptr = NULL; + /* sysfs fallback */ + res = write_file(path_buff, SYS_GW_MODE, argv[1], NULL); + if (res != EXIT_SUCCESS) + return res;
- switch (gw_mode) { + if (argc > 2) { + switch (gw_globals.mode) { case BATADV_GW_MODE_CLIENT: - res = read_file(path_buff, SYS_GW_SEL, USE_READ_BUFF, 0, 0, 0); + res = write_file(path_buff, SYS_GW_SEL, argv[2], NULL); break; case BATADV_GW_MODE_SERVER: - res = read_file(path_buff, SYS_GW_BW, USE_READ_BUFF, 0, 0, 0); + res = write_file(path_buff, SYS_GW_BW, argv[2], NULL); break; - default: - printf("off\n"); - goto out; } + }
- if (res != EXIT_SUCCESS) - goto out; + return res; +}
- if (line_ptr[strlen(line_ptr) - 1] == '\n') - line_ptr[strlen(line_ptr) - 1] = '\0'; +static int gw_mode(struct state *state, int argc, char **argv) +{ + int optchar, res = EXIT_FAILURE; + char *path_buff;
- switch (gw_mode) { - case BATADV_GW_MODE_CLIENT: - printf("client (selection class: %s)\n", line_ptr); - break; - case BATADV_GW_MODE_SERVER: - printf("server (announced bw: %s)\n", line_ptr); - break; + while ((optchar = getopt(argc, argv, "h")) != -1) { + switch (optchar) { + case 'h': + gw_mode_usage(); + return EXIT_SUCCESS; default: - goto out; + gw_mode_usage(); + return EXIT_FAILURE; } + }
- free(line_ptr); - line_ptr = NULL; + path_buff = malloc(PATH_BUFF_LEN); + if (!path_buff) { + fprintf(stderr, "Error - could not allocate path buffer: out of memory ?\n"); + return EXIT_FAILURE; + } + + snprintf(path_buff, PATH_BUFF_LEN, SYS_BATIF_PATH_FMT, state->mesh_iface); + + if (argc == 1) { + res = gw_read_setting(state, path_buff); goto out; }
@@ -247,28 +400,12 @@ static int gw_mode(struct state *state, int argc, char **argv) goto out; }
- res = write_file(path_buff, SYS_GW_MODE, argv[1], NULL); - if (res != EXIT_SUCCESS) - goto out; - - if (argc == 2) - goto out; - - switch (gw_globals.mode) { - case BATADV_GW_MODE_CLIENT: - res = write_file(path_buff, SYS_GW_SEL, argv[2], NULL); - break; - case BATADV_GW_MODE_SERVER: - res = write_file(path_buff, SYS_GW_BW, argv[2], NULL); - break; - } - - goto out; - + res = gw_write_setting(state, path_buff, argc, argv); out: free(path_buff); return res; }
-COMMAND(SUBCOMMAND, gw_mode, "gw", COMMAND_FLAG_MESH_IFACE, NULL, +COMMAND(SUBCOMMAND, gw_mode, "gw", + COMMAND_FLAG_MESH_IFACE | COMMAND_FLAG_NETLINK, NULL, "[mode] \tdisplay or modify the gateway mode");