Repository : ssh://git@open-mesh.org/batctl

On branch : master

commit a319ec4dcbffd0e65361ef4037f3698335cb50c4 Author: Sven Eckelmann sven@narfation.org Date: Sat Feb 9 14:42:11 2019 +0100

batctl: Support generic netlink for isolation_mark command

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 isolation_mark implementation is using the commands BATADV_CMD_SET_MESH/BATADV_CMD_GET_MESH to set/get the configuration of the mark/mask using the u32 attributes BATADV_ATTR_ISOLATION_MARK and BATADV_ATTR_ISOLATION_MASK.

Signed-off-by: Sven Eckelmann sven@narfation.org

a319ec4dcbffd0e65361ef4037f3698335cb50c4 isolation_mark.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 121 insertions(+), 2 deletions(-)

diff --git a/isolation_mark.c b/isolation_mark.c index c9d296e..aeb2da3 100644 --- a/isolation_mark.c +++ b/isolation_mark.c @@ -20,16 +20,135 @@ * License-Filename: LICENSES/preferred/GPL-2.0 */

+#include <errno.h> #include <stddef.h> +#include <stdint.h> +#include <string.h>

#include "main.h" #include "sys.h"

+static struct isolation_mark_data { + uint32_t isolation_mark; + uint32_t isolation_mask; +} isolation_mark; + +static int parse_isolation_mark(struct state *state, int argc, char *argv[]) +{ + struct settings_data *settings = state->cmd->arg; + struct isolation_mark_data *data = settings->data; + char *mask_ptr; + char buff[256]; + uint32_t mark; + uint32_t mask; + char *endptr; + + if (argc != 2) { + fprintf(stderr, "Error - incorrect number of arguments (expected 1)\n"); + return -EINVAL; + } + + strncpy(buff, argv[1], sizeof(buff)); + buff[sizeof(buff) - 1] = '\0'; + + /* parse the mask if it has been specified, otherwise assume the mask is + * the biggest possible + */ + mask = 0xFFFFFFFF; + mask_ptr = strchr(buff, '/'); + if (mask_ptr) { + *mask_ptr = '\0'; + mask_ptr++; + + /* the mask must be entered in hex base as it is going to be a + * bitmask and not a prefix length + */ + mask = strtoul(mask_ptr, &endptr, 16); + if (!endptr || *endptr != '\0') + goto inval_format; + } + + /* the mark can be entered in any base */ + mark = strtoul(buff, &endptr, 0); + if (!endptr || *endptr != '\0') + goto inval_format; + + data->isolation_mask = mask; + /* erase bits not covered by the mask */ + data->isolation_mark = mark & mask; + + return 0; + +inval_format: + fprintf(stderr, "Error - incorrect number of arguments (expected 1)\n"); + fprintf(stderr, "The following formats for mark(/mask) are allowed:\n"); + fprintf(stderr, " * 0x12345678\n"); + fprintf(stderr, " * 0x12345678/0xabcdef09\n"); + return -EINVAL; +} + +static int print_isolation_mark(struct nl_msg *msg, void *arg) +{ + struct nlattr *attrs[BATADV_ATTR_MAX + 1]; + struct nlmsghdr *nlh = nlmsg_hdr(msg); + struct genlmsghdr *ghdr; + int *result = arg; + + 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; + } + + if (!attrs[BATADV_ATTR_ISOLATION_MARK] || + !attrs[BATADV_ATTR_ISOLATION_MASK]) + return NL_OK; + + printf("0x%08x/0x%08x\n", + nla_get_u32(attrs[BATADV_ATTR_ISOLATION_MARK]), + nla_get_u32(attrs[BATADV_ATTR_ISOLATION_MASK])); + + *result = 0; + return NL_STOP; +} + +static int get_isolation_mark(struct state *state) +{ + return sys_simple_nlquery(state, BATADV_CMD_GET_MESH, + NULL, print_isolation_mark); +} + +static int set_attrs_isolation_mark(struct nl_msg *msg, void *arg) +{ + struct state *state = arg; + struct settings_data *settings = state->cmd->arg; + struct isolation_mark_data *data = settings->data; + + nla_put_u32(msg, BATADV_ATTR_ISOLATION_MARK, data->isolation_mark); + nla_put_u32(msg, BATADV_ATTR_ISOLATION_MASK, data->isolation_mask); + + return 0; +} + +static int set_isolation_mark(struct state *state) +{ + return sys_simple_nlquery(state, BATADV_CMD_SET_MESH, + set_attrs_isolation_mark, NULL); +} + static struct settings_data batctl_settings_isolation_mark = { .sysfs_name = "isolation_mark", - .params = NULL, + .data = &isolation_mark, + .parse = parse_isolation_mark, + .netlink_get = get_isolation_mark, + .netlink_set = set_isolation_mark, };

COMMAND_NAMED(SUBCOMMAND, isolation_mark, "mark", handle_sys_setting, - COMMAND_FLAG_MESH_IFACE, &batctl_settings_isolation_mark, + COMMAND_FLAG_MESH_IFACE | COMMAND_FLAG_NETLINK, + &batctl_settings_isolation_mark, "[mark] \tdisplay or modify isolation_mark setting");