47148ab3cb
Querying the OS routing table is important for making decisions about which local and remote interfaces should be paired into reliable communication channels. Reviewed-by: Jeff Squyres <jsquyres@cisco.com> cmr=v1.7.5:ticket=trac:4253 This commit was SVN r30848. The following Trac tickets were found above: Ticket 4253 --> https://svn.open-mpi.org/trac/ompi/ticket/4253
37 строки
1.2 KiB
C
37 строки
1.2 KiB
C
/*
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* Copyright (c) 2014 Cisco Systems, Inc. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#ifndef LIBNL_UTILS_H
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#define LIBNL_UTILS_H
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/* This header file and btl_usnic_libnl1_utils.c/btl_usnic_libnl3_utils.c are
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* here to support OS routing lookups. They use the Linux "routing netlink"
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* communication subsystem (see "man 7 rtnetlink") via the "libnl" helper
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* library. Unfortunately, libnl comes in two major versions: libnl (v1) and
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* libnl-3 with significant API differences between them.
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*
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* Quick glossary to some of the abbreviations here:
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* rtnl -- rtnetlink (routing netlink)
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* sk -- socket
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*/
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struct usnic_rtnl_sk;
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/* returns zero on success or negative errno values on failure */
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int ompi_btl_usnic_rtnl_sk_alloc(struct usnic_rtnl_sk **p_sk);
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void ompi_btl_usnic_rtnl_sk_free(struct usnic_rtnl_sk* u_nlsk);
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/* src_addr and dst_addr are IPv4 addresses in network byte order. Returns
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* zero on successful route lookup, -1 otherwise. */
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int ompi_btl_usnic_nl_ip_rt_lookup(struct usnic_rtnl_sk *unlsk, uint32_t src_addr,
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uint32_t dst_addr, int *metric);
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#endif /* LIBNL_UTILS_H */
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