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Diffstat (limited to '')
-rw-r--r-- | net/batman-adv/bat_algo.c | 227 |
1 files changed, 227 insertions, 0 deletions
diff --git a/net/batman-adv/bat_algo.c b/net/batman-adv/bat_algo.c new file mode 100644 index 000000000..382fbe51f --- /dev/null +++ b/net/batman-adv/bat_algo.c @@ -0,0 +1,227 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright (C) 2007-2020 B.A.T.M.A.N. contributors: + * + * Marek Lindner, Simon Wunderlich + */ + +#include "main.h" + +#include <linux/errno.h> +#include <linux/list.h> +#include <linux/moduleparam.h> +#include <linux/netlink.h> +#include <linux/printk.h> +#include <linux/seq_file.h> +#include <linux/skbuff.h> +#include <linux/stddef.h> +#include <linux/string.h> +#include <net/genetlink.h> +#include <net/netlink.h> +#include <uapi/linux/batman_adv.h> + +#include "bat_algo.h" +#include "netlink.h" + +char batadv_routing_algo[20] = "BATMAN_IV"; +static struct hlist_head batadv_algo_list; + +/** + * batadv_algo_init() - Initialize batman-adv algorithm management data + * structures + */ +void batadv_algo_init(void) +{ + INIT_HLIST_HEAD(&batadv_algo_list); +} + +static struct batadv_algo_ops *batadv_algo_get(char *name) +{ + struct batadv_algo_ops *bat_algo_ops = NULL, *bat_algo_ops_tmp; + + hlist_for_each_entry(bat_algo_ops_tmp, &batadv_algo_list, list) { + if (strcmp(bat_algo_ops_tmp->name, name) != 0) + continue; + + bat_algo_ops = bat_algo_ops_tmp; + break; + } + + return bat_algo_ops; +} + +/** + * batadv_algo_register() - Register callbacks for a mesh algorithm + * @bat_algo_ops: mesh algorithm callbacks to add + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_algo_register(struct batadv_algo_ops *bat_algo_ops) +{ + struct batadv_algo_ops *bat_algo_ops_tmp; + + bat_algo_ops_tmp = batadv_algo_get(bat_algo_ops->name); + if (bat_algo_ops_tmp) { + pr_info("Trying to register already registered routing algorithm: %s\n", + bat_algo_ops->name); + return -EEXIST; + } + + /* all algorithms must implement all ops (for now) */ + if (!bat_algo_ops->iface.enable || + !bat_algo_ops->iface.disable || + !bat_algo_ops->iface.update_mac || + !bat_algo_ops->iface.primary_set || + !bat_algo_ops->neigh.cmp || + !bat_algo_ops->neigh.is_similar_or_better) { + pr_info("Routing algo '%s' does not implement required ops\n", + bat_algo_ops->name); + return -EINVAL; + } + + INIT_HLIST_NODE(&bat_algo_ops->list); + hlist_add_head(&bat_algo_ops->list, &batadv_algo_list); + + return 0; +} + +/** + * batadv_algo_select() - Select algorithm of soft interface + * @bat_priv: the bat priv with all the soft interface information + * @name: name of the algorithm to select + * + * The algorithm callbacks for the soft interface will be set when the algorithm + * with the correct name was found. Any previous selected algorithm will not be + * deinitialized and the new selected algorithm will also not be initialized. + * It is therefore not allowed to call batadv_algo_select outside the creation + * function of the soft interface. + * + * Return: 0 on success or negative error number in case of failure + */ +int batadv_algo_select(struct batadv_priv *bat_priv, char *name) +{ + struct batadv_algo_ops *bat_algo_ops; + + bat_algo_ops = batadv_algo_get(name); + if (!bat_algo_ops) + return -EINVAL; + + bat_priv->algo_ops = bat_algo_ops; + + return 0; +} + +#ifdef CONFIG_BATMAN_ADV_DEBUGFS + +/** + * batadv_algo_seq_print_text() - Print the supported algorithms in a seq file + * @seq: seq file to print on + * @offset: not used + * + * Return: always 0 + */ +int batadv_algo_seq_print_text(struct seq_file *seq, void *offset) +{ + struct batadv_algo_ops *bat_algo_ops; + + seq_puts(seq, "Available routing algorithms:\n"); + + hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { + seq_printf(seq, " * %s\n", bat_algo_ops->name); + } + + return 0; +} +#endif + +static int batadv_param_set_ra(const char *val, const struct kernel_param *kp) +{ + struct batadv_algo_ops *bat_algo_ops; + char *algo_name = (char *)val; + size_t name_len = strlen(algo_name); + + if (name_len > 0 && algo_name[name_len - 1] == '\n') + algo_name[name_len - 1] = '\0'; + + bat_algo_ops = batadv_algo_get(algo_name); + if (!bat_algo_ops) { + pr_err("Routing algorithm '%s' is not supported\n", algo_name); + return -EINVAL; + } + + return param_set_copystring(algo_name, kp); +} + +static const struct kernel_param_ops batadv_param_ops_ra = { + .set = batadv_param_set_ra, + .get = param_get_string, +}; + +static struct kparam_string batadv_param_string_ra = { + .maxlen = sizeof(batadv_routing_algo), + .string = batadv_routing_algo, +}; + +module_param_cb(routing_algo, &batadv_param_ops_ra, &batadv_param_string_ra, + 0644); + +/** + * batadv_algo_dump_entry() - fill in information about one supported routing + * algorithm + * @msg: netlink message to be sent back + * @portid: Port to reply to + * @seq: Sequence number of message + * @bat_algo_ops: Algorithm to be dumped + * + * Return: Error number, or 0 on success + */ +static int batadv_algo_dump_entry(struct sk_buff *msg, u32 portid, u32 seq, + struct batadv_algo_ops *bat_algo_ops) +{ + void *hdr; + + hdr = genlmsg_put(msg, portid, seq, &batadv_netlink_family, + NLM_F_MULTI, BATADV_CMD_GET_ROUTING_ALGOS); + if (!hdr) + return -EMSGSIZE; + + if (nla_put_string(msg, BATADV_ATTR_ALGO_NAME, bat_algo_ops->name)) + goto nla_put_failure; + + genlmsg_end(msg, hdr); + return 0; + + nla_put_failure: + genlmsg_cancel(msg, hdr); + return -EMSGSIZE; +} + +/** + * batadv_algo_dump() - fill in information about supported routing + * algorithms + * @msg: netlink message to be sent back + * @cb: Parameters to the netlink request + * + * Return: Length of reply message. + */ +int batadv_algo_dump(struct sk_buff *msg, struct netlink_callback *cb) +{ + int portid = NETLINK_CB(cb->skb).portid; + struct batadv_algo_ops *bat_algo_ops; + int skip = cb->args[0]; + int i = 0; + + hlist_for_each_entry(bat_algo_ops, &batadv_algo_list, list) { + if (i++ < skip) + continue; + + if (batadv_algo_dump_entry(msg, portid, cb->nlh->nlmsg_seq, + bat_algo_ops)) { + i--; + break; + } + } + + cb->args[0] = i; + + return msg->len; +} |