| 1 | /* Copyright (C) 2007-2016 B.A.T.M.A.N. contributors: |
| 2 | * |
| 3 | * Marek Lindner, Simon Wunderlich |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of version 2 of the GNU General Public |
| 7 | * License as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but |
| 10 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, see <http://www.gnu.org/licenses/>. |
| 16 | */ |
| 17 | |
| 18 | #include "main.h" |
| 19 | |
| 20 | #include <linux/errno.h> |
| 21 | #include <linux/list.h> |
| 22 | #include <linux/moduleparam.h> |
| 23 | #include <linux/netlink.h> |
| 24 | #include <linux/printk.h> |
| 25 | #include <linux/seq_file.h> |
| 26 | #include <linux/skbuff.h> |
| 27 | #include <linux/stddef.h> |
| 28 | #include <linux/string.h> |
| 29 | #include <net/genetlink.h> |
| 30 | #include <net/netlink.h> |
| 31 | #include <uapi/linux/batman_adv.h> |
| 32 | |
| 33 | #include "bat_algo.h" |
| 34 | #include "netlink.h" |
| 35 | |
| 36 | char batadv_routing_algo[20] = "BATMAN_IV"; |
| 37 | static struct hlist_head batadv_algo_list; |
| 38 | |
| 39 | /** |
| 40 | * batadv_algo_init - Initialize batman-adv algorithm management data structures |
| 41 | */ |
| 42 | void batadv_algo_init(void) |
| 43 | { |
| 44 | INIT_HLIST_HEAD(&batadv_algo_list); |
| 45 | } |
| 46 | |
| 47 | static struct batadv_algo_ops *batadv_algo_get(char *name) |
| 48 | { |
| 49 | struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; |
| 50 | |
| 51 | hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { |
| 52 | if (strcmp(bat_algo_ops_tmp->name, name) != 0) |
| 53 | continue; |
| 54 | |
| 55 | bat_algo_ops = bat_algo_ops_tmp; |
| 56 | break; |
| 57 | } |
| 58 | |
| 59 | return bat_algo_ops; |
| 60 | } |
| 61 | |
| 62 | int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) |
| 63 | { |
| 64 | struct batadv_algo_ops *bat_algo_ops_tmp; |
| 65 | |
| 66 | bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); |
| 67 | if (bat_algo_ops_tmp) { |
| 68 | pr_info("Trying to register already registered routing algorithm: %s\n", |
| 69 | bat_algo_ops->name); |
| 70 | return -EEXIST; |
| 71 | } |
| 72 | |
| 73 | /* all algorithms must implement all ops (for now) */ |
| 74 | if (!bat_algo_ops->iface.enable || |
| 75 | !bat_algo_ops->iface.disable || |
| 76 | !bat_algo_ops->iface.update_mac || |
| 77 | !bat_algo_ops->iface.primary_set || |
| 78 | !bat_algo_ops->neigh.cmp || |
| 79 | !bat_algo_ops->neigh.is_similar_or_better) { |
| 80 | pr_info("Routing algo '%s' does not implement required ops\n", |
| 81 | bat_algo_ops->name); |
| 82 | return -EINVAL; |
| 83 | } |
| 84 | |
| 85 | INIT_HLIST_NODE(&bat_algo_ops->list); |
| 86 | hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); |
| 87 | |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | int batadv_algo_select(struct batadv_priv *bat_priv, char *name) |
| 92 | { |
| 93 | struct batadv_algo_ops *bat_algo_ops; |
| 94 | |
| 95 | bat_algo_ops = batadv_algo_get(name); |
| 96 | if (!bat_algo_ops) |
| 97 | return -EINVAL; |
| 98 | |
| 99 | bat_priv->algo_ops = bat_algo_ops; |
| 100 | |
| 101 | return 0; |
| 102 | } |
| 103 | |
| 104 | int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) |
| 105 | { |
| 106 | struct batadv_algo_ops *bat_algo_ops; |
| 107 | |
| 108 | seq_puts(seq, "Available routing algorithms:\n"); |
| 109 | |
| 110 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
| 111 | seq_printf(seq, " * %s\n", bat_algo_ops->name); |
| 112 | } |
| 113 | |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) |
| 118 | { |
| 119 | struct batadv_algo_ops *bat_algo_ops; |
| 120 | char *algo_name = (char *)val; |
| 121 | size_t name_len = strlen(algo_name); |
| 122 | |
| 123 | if (name_len > 0 && algo_name[name_len - 1] == '\n') |
| 124 | algo_name[name_len - 1] = '\0'; |
| 125 | |
| 126 | bat_algo_ops = batadv_algo_get(algo_name); |
| 127 | if (!bat_algo_ops) { |
| 128 | pr_err("Routing algorithm '%s' is not supported\n", algo_name); |
| 129 | return -EINVAL; |
| 130 | } |
| 131 | |
| 132 | return param_set_copystring(algo_name, kp); |
| 133 | } |
| 134 | |
| 135 | static const struct kernel_param_ops batadv_param_ops_ra = { |
| 136 | .set = batadv_param_set_ra, |
| 137 | .get = param_get_string, |
| 138 | }; |
| 139 | |
| 140 | static struct kparam_string batadv_param_string_ra = { |
| 141 | .maxlen = sizeof(batadv_routing_algo), |
| 142 | .string = batadv_routing_algo, |
| 143 | }; |
| 144 | |
| 145 | module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, |
| 146 | 0644); |
| 147 | |
| 148 | /** |
| 149 | * batadv_algo_dump_entry - fill in information about one supported routing |
| 150 | * algorithm |
| 151 | * @msg: netlink message to be sent back |
| 152 | * @portid: Port to reply to |
| 153 | * @seq: Sequence number of message |
| 154 | * @bat_algo_ops: Algorithm to be dumped |
| 155 | * |
| 156 | * Return: Error number, or 0 on success |
| 157 | */ |
| 158 | static int batadv_algo_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, |
| 159 | struct batadv_algo_ops *bat_algo_ops) |
| 160 | { |
| 161 | void *hdr; |
| 162 | |
| 163 | hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, |
| 164 | NLM_F_MULTI, BATADV_CMD_GET_ROUTING_ALGOS); |
| 165 | if (!hdr) |
| 166 | return -EMSGSIZE; |
| 167 | |
| 168 | if (nla_put_string(msg, BATADV_ATTR_ALGO_NAME, bat_algo_ops->name)) |
| 169 | goto nla_put_failure; |
| 170 | |
| 171 | genlmsg_end(msg, hdr); |
| 172 | return 0; |
| 173 | |
| 174 | nla_put_failure: |
| 175 | genlmsg_cancel(msg, hdr); |
| 176 | return -EMSGSIZE; |
| 177 | } |
| 178 | |
| 179 | /** |
| 180 | * batadv_algo_dump - fill in information about supported routing |
| 181 | * algorithms |
| 182 | * @msg: netlink message to be sent back |
| 183 | * @cb: Parameters to the netlink request |
| 184 | * |
| 185 | * Return: Length of reply message. |
| 186 | */ |
| 187 | int batadv_algo_dump(struct sk_buff *msg, struct netlink_callback *cb) |
| 188 | { |
| 189 | int portid = NETLINK_CB(cb->skb).portid; |
| 190 | struct batadv_algo_ops *bat_algo_ops; |
| 191 | int skip = cb->args[0]; |
| 192 | int i = 0; |
| 193 | |
| 194 | hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { |
| 195 | if (i++ < skip) |
| 196 | continue; |
| 197 | |
| 198 | if (batadv_algo_dump_entry(msg, portid, cb->nlh->nlmsg_seq, |
| 199 | bat_algo_ops)) { |
| 200 | i--; |
| 201 | break; |
| 202 | } |
| 203 | } |
| 204 | |
| 205 | cb->args[0] = i; |
| 206 | |
| 207 | return msg->len; |
| 208 | } |