Repository : ssh://git@diktynna/batctl
On branch : master
commit ff4f4de578867460b78a4eb63977ae53c0a66f02 Author: Sven Eckelmann sven@narfation.org Date: Mon May 10 18:37:15 2021 +0200
batctl: interface: List using shared genl socket
The interface subcommand doesn't need to allocate a new netlink socket to query the state of a single interface. But it can also not use the socket which is automatically pre-configured by COMMAND_FLAG_NETLINK because the (main sub)command might also be started for interfaces which might not exist yet.
Instead use the shared functions to pre-allocate the necessary state information when calling the "list" sub-subcommand.
Signed-off-by: Sven Eckelmann sven@narfation.org
ff4f4de578867460b78a4eb63977ae53c0a66f02 interface.c | 77 +++++++++++++++++++++++++------------------------------------ 1 file changed, 31 insertions(+), 46 deletions(-)
diff --git a/interface.c b/interface.c index cf9c0c3..a96a328 100644 --- a/interface.c +++ b/interface.c @@ -62,65 +62,46 @@ static int get_iface_status_netlink_parse(struct nl_msg *msg, void *arg)
iface_status[IFACE_STATUS_LEN - 1] = '\0';
- return NL_STOP; + return NL_OK; }
-static char *get_iface_status_netlink(unsigned int meshif, unsigned int hardif, +static char *get_iface_status_netlink(struct state *state, unsigned int hardif, char *iface_status) { char *ret_status = NULL; - struct nl_sock *sock; struct nl_msg *msg; - int batadv_family; - struct nl_cb *cb; int ret;
iface_status[0] = '\0';
- sock = nl_socket_alloc(); - if (!sock) - return NULL; - - ret = genl_connect(sock); - if (ret < 0) - goto err_free_sock; - - batadv_family = genl_ctrl_resolve(sock, BATADV_NL_NAME); - if (batadv_family < 0) - goto err_free_sock; - - cb = nl_cb_alloc(NL_CB_DEFAULT); - if (!cb) - goto err_free_sock; - - nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, get_iface_status_netlink_parse, + nl_cb_set(state->cb, NL_CB_VALID, NL_CB_CUSTOM, get_iface_status_netlink_parse, iface_status);
msg = nlmsg_alloc(); if (!msg) - goto err_free_cb; + return NULL;
- genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, batadv_family, + genlmsg_put(msg, NL_AUTO_PID, NL_AUTO_SEQ, state->batadv_family, 0, 0, BATADV_CMD_GET_HARDIF, 1);
- nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, meshif); + nla_put_u32(msg, BATADV_ATTR_MESH_IFINDEX, state->mesh_ifindex); nla_put_u32(msg, BATADV_ATTR_HARD_IFINDEX, hardif);
- ret = nl_send_auto_complete(sock, msg); + ret = nl_send_auto_complete(state->sock, msg); + if (ret < 0) + goto err_free_msg; + + ret = nl_recvmsgs(state->sock, state->cb); if (ret < 0) goto err_free_msg;
- nl_recvmsgs(sock, cb); + nl_wait_for_ack(state->sock);
if (strlen(iface_status) > 0) ret_status = iface_status;
err_free_msg: nlmsg_free(msg); -err_free_cb: - nl_cb_put(cb); -err_free_sock: - nl_socket_free(sock);
return ret_status; } @@ -130,20 +111,16 @@ static struct nla_policy link_policy[IFLA_MAX + 1] = { [IFLA_MASTER] = { .type = NLA_U32 }, };
-struct print_interfaces_rtnl_arg { - int ifindex; -}; - static int print_interfaces_rtnl_parse(struct nl_msg *msg, void *arg) { - struct print_interfaces_rtnl_arg *print_arg = arg; char iface_status[IFACE_STATUS_LEN]; struct nlattr *attrs[IFLA_MAX + 1]; + struct state *state = arg; struct ifinfomsg *ifm; + unsigned int master; char *ifname; int ret; const char *status; - int master;
ifm = nlmsg_data(nlmsg_hdr(msg)); ret = nlmsg_parse(nlmsg_hdr(msg), sizeof(*ifm), attrs, IFLA_MAX, @@ -161,10 +138,10 @@ static int print_interfaces_rtnl_parse(struct nl_msg *msg, void *arg) master = nla_get_u32(attrs[IFLA_MASTER]);
/* required on older kernels which don't prefilter the results */ - if (master != print_arg->ifindex) + if (master != state->mesh_ifindex) goto err;
- status = get_iface_status_netlink(master, ifm->ifi_index, iface_status); + status = get_iface_status_netlink(state, ifm->ifi_index, iface_status); if (!status) status = "<error reading status>\n";
@@ -174,21 +151,29 @@ err: return NL_OK; }
-static int print_interfaces(char *mesh_iface) +static int print_interfaces(struct state *state) { - struct print_interfaces_rtnl_arg print_arg; + int ret;
if (!file_exists(module_ver_path)) { fprintf(stderr, "Error - batman-adv module has not been loaded\n"); return EXIT_FAILURE; }
- print_arg.ifindex = if_nametoindex(mesh_iface); - if (!print_arg.ifindex) + /* duplicated code here from the main() because interface doesn't always + * need COMMAND_FLAG_MESH_IFACE and COMMAND_FLAG_NETLINK + */ + if (check_mesh_iface(state)) return EXIT_FAILURE;
- query_rtnl_link(print_arg.ifindex, print_interfaces_rtnl_parse, - &print_arg); + ret = netlink_create(state); + if (ret < 0) + return EXIT_FAILURE; + + query_rtnl_link(state->mesh_ifindex, print_interfaces_rtnl_parse, + state); + + netlink_destroy(state);
return EXIT_SUCCESS; } @@ -452,7 +437,7 @@ static int interface(struct state *state, int argc, char **argv) rest_argv = &argv[optind];
if (rest_argc == 0) - return print_interfaces(state->mesh_iface); + return print_interfaces(state);
check_root_or_die("batctl interface");