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dd78dfc7be
Allocation of a new netlink message with the two usual headers is reusable with other netlink netlink message types. Extract it into a helper, mnlu_msg_prepare(). Take the second header as an argument, instead of passing in parameters to initialize it, and copy it in. Signed-off-by: Petr Machata <me@pmachata.org> Signed-off-by: David Ahern <dsahern@gmail.com>
50 lines
1007 B
C
50 lines
1007 B
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* mnl_utils.c Helpers for working with libmnl.
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*/
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#include <string.h>
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#include <time.h>
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#include <libmnl/libmnl.h>
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#include "mnl_utils.h"
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struct mnl_socket *mnlu_socket_open(int bus)
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{
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struct mnl_socket *nl;
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int one = 1;
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nl = mnl_socket_open(bus);
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if (nl == NULL)
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return NULL;
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mnl_socket_setsockopt(nl, NETLINK_CAP_ACK, &one, sizeof(one));
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mnl_socket_setsockopt(nl, NETLINK_EXT_ACK, &one, sizeof(one));
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if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0)
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goto err_bind;
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return nl;
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err_bind:
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mnl_socket_close(nl);
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return NULL;
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}
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struct nlmsghdr *mnlu_msg_prepare(void *buf, uint32_t nlmsg_type, uint16_t flags,
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void *extra_header, size_t extra_header_size)
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{
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struct nlmsghdr *nlh;
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void *eh;
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nlh = mnl_nlmsg_put_header(buf);
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nlh->nlmsg_type = nlmsg_type;
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nlh->nlmsg_flags = flags;
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nlh->nlmsg_seq = time(NULL);
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eh = mnl_nlmsg_put_extra_header(nlh, extra_header_size);
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memcpy(eh, extra_header, extra_header_size);
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return nlh;
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}
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