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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 | // SPDX-License-Identifier: LGPL-2.1+ // Copyright (C) 2022, Linaro Ltd - Daniel Lezcano <daniel.lezcano@linaro.org> #include <errno.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <thermal.h> #include "thermal_nl.h" struct handler_args { const char *group; int id; }; static __thread int err; static __thread int done; static int nl_seq_check_handler(struct nl_msg *msg, void *arg) { return NL_OK; } static int nl_error_handler(struct sockaddr_nl *nla, struct nlmsgerr *nl_err, void *arg) { int *ret = arg; if (ret) *ret = nl_err->error; return NL_STOP; } static int nl_finish_handler(struct nl_msg *msg, void *arg) { int *ret = arg; if (ret) *ret = 1; return NL_OK; } static int nl_ack_handler(struct nl_msg *msg, void *arg) { int *ret = arg; if (ret) *ret = 1; return NL_OK; } int nl_send_msg(struct nl_sock *sock, struct nl_cb *cb, struct nl_msg *msg, int (*rx_handler)(struct nl_msg *, void *), void *data) { if (!rx_handler) return THERMAL_ERROR; err = nl_send_auto_complete(sock, msg); if (err < 0) return err; nl_cb_set(cb, NL_CB_VALID, NL_CB_CUSTOM, rx_handler, data); err = done = 0; while (err == 0 && done == 0) nl_recvmsgs(sock, cb); return err; } static int nl_family_handler(struct nl_msg *msg, void *arg) { struct handler_args *grp = arg; struct nlattr *tb[CTRL_ATTR_MAX + 1]; struct genlmsghdr *gnlh = nlmsg_data(nlmsg_hdr(msg)); struct nlattr *mcgrp; int rem_mcgrp; nla_parse(tb, CTRL_ATTR_MAX, genlmsg_attrdata(gnlh, 0), genlmsg_attrlen(gnlh, 0), NULL); if (!tb[CTRL_ATTR_MCAST_GROUPS]) return THERMAL_ERROR; nla_for_each_nested(mcgrp, tb[CTRL_ATTR_MCAST_GROUPS], rem_mcgrp) { struct nlattr *tb_mcgrp[CTRL_ATTR_MCAST_GRP_MAX + 1]; nla_parse(tb_mcgrp, CTRL_ATTR_MCAST_GRP_MAX, nla_data(mcgrp), nla_len(mcgrp), NULL); if (!tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME] || !tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]) continue; if (strncmp(nla_data(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]), grp->group, nla_len(tb_mcgrp[CTRL_ATTR_MCAST_GRP_NAME]))) continue; grp->id = nla_get_u32(tb_mcgrp[CTRL_ATTR_MCAST_GRP_ID]); break; } return THERMAL_SUCCESS; } static int nl_get_multicast_id(struct nl_sock *sock, struct nl_cb *cb, const char *family, const char *group) { struct nl_msg *msg; int ret = 0, ctrlid; struct handler_args grp = { .group = group, .id = -ENOENT, }; msg = nlmsg_alloc(); if (!msg) return THERMAL_ERROR; ctrlid = genl_ctrl_resolve(sock, "nlctrl"); genlmsg_put(msg, 0, 0, ctrlid, 0, 0, CTRL_CMD_GETFAMILY, 0); nla_put_string(msg, CTRL_ATTR_FAMILY_NAME, family); ret = nl_send_msg(sock, cb, msg, nl_family_handler, &grp); if (ret) goto nla_put_failure; ret = grp.id; nla_put_failure: nlmsg_free(msg); return ret; } int nl_thermal_connect(struct nl_sock **nl_sock, struct nl_cb **nl_cb) { struct nl_cb *cb; struct nl_sock *sock; cb = nl_cb_alloc(NL_CB_DEFAULT); if (!cb) return THERMAL_ERROR; sock = nl_socket_alloc(); if (!sock) goto out_cb_free; if (genl_connect(sock)) goto out_socket_free; if (nl_cb_err(cb, NL_CB_CUSTOM, nl_error_handler, &err) || nl_cb_set(cb, NL_CB_FINISH, NL_CB_CUSTOM, nl_finish_handler, &done) || nl_cb_set(cb, NL_CB_ACK, NL_CB_CUSTOM, nl_ack_handler, &done) || nl_cb_set(cb, NL_CB_SEQ_CHECK, NL_CB_CUSTOM, nl_seq_check_handler, &done)) return THERMAL_ERROR; *nl_sock = sock; *nl_cb = cb; return THERMAL_SUCCESS; out_socket_free: nl_socket_free(sock); out_cb_free: nl_cb_put(cb); return THERMAL_ERROR; } void nl_thermal_disconnect(struct nl_sock *nl_sock, struct nl_cb *nl_cb) { nl_close(nl_sock); nl_socket_free(nl_sock); nl_cb_put(nl_cb); } int nl_unsubscribe_thermal(struct nl_sock *nl_sock, struct nl_cb *nl_cb, const char *group) { int mcid; mcid = nl_get_multicast_id(nl_sock, nl_cb, THERMAL_GENL_FAMILY_NAME, group); if (mcid < 0) return THERMAL_ERROR; if (nl_socket_drop_membership(nl_sock, mcid)) return THERMAL_ERROR; return THERMAL_SUCCESS; } int nl_subscribe_thermal(struct nl_sock *nl_sock, struct nl_cb *nl_cb, const char *group) { int mcid; mcid = nl_get_multicast_id(nl_sock, nl_cb, THERMAL_GENL_FAMILY_NAME, group); if (mcid < 0) return THERMAL_ERROR; if (nl_socket_add_membership(nl_sock, mcid)) return THERMAL_ERROR; return THERMAL_SUCCESS; } |