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67 lines
2.1 KiB
67 lines
2.1 KiB
/* |
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* Copyright 2012 Daniel Drown <dan-android@drown.org> |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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* |
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* netlink_callbacks.c - generic callbacks for netlink responses |
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*/ |
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#include <netinet/in.h> |
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#include <net/if.h> |
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#include <linux/rtnetlink.h> |
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#include <netlink/handlers.h> |
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#include <netlink/msg.h> |
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/* function: ack_handler |
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* generic netlink callback for ack messages |
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* msg - netlink message |
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* data - pointer to an int, stores the success code |
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*/ |
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static int ack_handler(__attribute__((unused)) struct nl_msg *msg, void *data) { |
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int *retval = data; |
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*retval = 0; |
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return NL_OK; |
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} |
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/* function: error_handler |
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* generic netlink callback for error messages |
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* nla - error source |
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* err - netlink error message |
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* arg - pointer to an int, stores the error code |
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*/ |
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static int error_handler(__attribute__((unused)) struct sockaddr_nl *nla, |
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struct nlmsgerr *err, void *arg) { |
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int *retval = arg; |
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if(err->error < 0) { |
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*retval = err->error; |
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} else { |
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*retval = 0; // NLMSG_ERROR used as reply type on no error |
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} |
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return NL_OK; |
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} |
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/* function: alloc_ack_callbacks |
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* allocates a set of netlink callbacks. returns NULL on failure. callbacks will modify retval with <0 meaning failure |
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* retval - shared state between caller and callback functions |
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*/ |
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struct nl_cb *alloc_ack_callbacks(int *retval) { |
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struct nl_cb *callbacks; |
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callbacks = nl_cb_alloc(NL_CB_DEFAULT); |
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if(!callbacks) { |
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return NULL; |
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} |
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nl_cb_set(callbacks, NL_CB_ACK, NL_CB_CUSTOM, ack_handler, retval); |
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nl_cb_err(callbacks, NL_CB_CUSTOM, error_handler, retval); |
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return callbacks; |
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}
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