7c25284e30
Each kernel netdevice may have queueing disciplines set for it, which determine how to handle the packet (mostly on egress). That's part of the TC (Traffic Control) mechanism. Through TC, it is possible to set filter rules that match specific packets, and act according to what is in the rule. This is a perfect candidate to implement the flow API for the tap PMD, as it has an associated kernel netdevice automatically. Each flow API rule will be translated into its TC counterpart. To leverage TC, it is necessary to communicate with the kernel using netlink. This patch introduces a library to help that communication. Inside netlink.c, functions are generic for any netlink messaging. Inside tcmsgs.c, functions are specific to deal with TC rules. Signed-off-by: Pascal Mazon <pascal.mazon@6wind.com> Acked-by: Olga Shern <olgas@mellanox.com> Acked-by: Keith Wiles <keith.wiles@intel.com>
70 lines
2.7 KiB
C
70 lines
2.7 KiB
C
/*-
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* BSD LICENSE
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*
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* Copyright 2017 6WIND S.A.
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* Copyright 2017 Mellanox.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of 6WIND S.A. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _TAP_NETLINK_H_
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#define _TAP_NETLINK_H_
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#include <ctype.h>
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#include <inttypes.h>
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#include <linux/rtnetlink.h>
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#include <linux/netlink.h>
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#include <stdio.h>
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#include <rte_log.h>
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#define NLMSG_BUF 512
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struct nlmsg {
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struct nlmsghdr nh;
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struct tcmsg t;
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char buf[NLMSG_BUF];
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struct nested_tail *nested_tails;
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};
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#define NLMSG_TAIL(nlh) (void *)((char *)(nlh) + NLMSG_ALIGN((nlh)->nlmsg_len))
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int nl_init(void);
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int nl_final(int nlsk_fd);
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int nl_send(int nlsk_fd, struct nlmsghdr *nh);
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int nl_recv(int nlsk_fd, int (*callback)(struct nlmsghdr *, void *), void *arg);
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int nl_recv_ack(int nlsk_fd);
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void nlattr_add(struct nlmsghdr *nh, unsigned short type,
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unsigned int data_len, const void *data);
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void nlattr_add8(struct nlmsghdr *nh, unsigned short type, uint8_t data);
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void nlattr_add16(struct nlmsghdr *nh, unsigned short type, uint16_t data);
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void nlattr_add32(struct nlmsghdr *nh, unsigned short type, uint32_t data);
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int nlattr_nested_start(struct nlmsg *msg, uint16_t type);
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void nlattr_nested_finish(struct nlmsg *msg);
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#endif /* _TAP_NETLINK_H_ */
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