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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/include/net/dn_route.h
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#ifndef _NET_DN_ROUTE_H

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#define _NET_DN_ROUTE_H

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/******************************************************************************

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    (c) 1995-1998 E.M. Serrat		[email protected]

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    This program is free software; you can redistribute it and/or modify

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    it under the terms of the GNU General Public License as published by

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    the Free Software Foundation; either version 2 of the License, or

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    any later version.

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    This program is distributed in the hope that it will be useful,

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    but WITHOUT ANY WARRANTY; without even the implied warranty of

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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

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    GNU General Public License for more details.

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*******************************************************************************/

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extern struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);

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extern int dn_route_output_sock(struct dst_entry **pprt, struct flowidn *, struct sock *sk, int flags);

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extern int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);

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extern void dn_rt_cache_flush(int delay);

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/* Masks for flags field */

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#define DN_RT_F_PID 0x07 /* Mask for packet type                      */

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#define DN_RT_F_PF  0x80 /* Padding Follows                           */

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#define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1          */

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#define DN_RT_F_IE  0x20 /* Intra Ethernet, Reserved in short pkt     */

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#define DN_RT_F_RTS 0x10 /* Packet is being returned to sender        */

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#define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */

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/* Mask for types of routing packets */

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#define DN_RT_PKT_MSK   0x06

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/* Types of routing packets */

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#define DN_RT_PKT_SHORT 0x02 /* Short routing packet */

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#define DN_RT_PKT_LONG  0x06 /* Long routing packet  */

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/* Mask for control/routing selection */

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#define DN_RT_PKT_CNTL  0x01 /* Set to 1 if a control packet  */

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/* Types of control packets */

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#define DN_RT_CNTL_MSK  0x0f /* Mask for control packets      */

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#define DN_RT_PKT_INIT  0x01 /* Initialisation packet         */

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#define DN_RT_PKT_VERI  0x03 /* Verification Message          */

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#define DN_RT_PKT_HELO  0x05 /* Hello and Test Message        */

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#define DN_RT_PKT_L1RT  0x07 /* Level 1 Routing Message       */

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#define DN_RT_PKT_L2RT  0x09 /* Level 2 Routing Message       */

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#define DN_RT_PKT_ERTH  0x0b /* Ethernet Router Hello         */

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#define DN_RT_PKT_EEDH  0x0d /* Ethernet EndNode Hello        */

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/* Values for info field in hello message */

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#define DN_RT_INFO_TYPE 0x03 /* Type mask                     */

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#define DN_RT_INFO_L1RT 0x02 /* L1 Router                     */

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#define DN_RT_INFO_L2RT 0x01 /* L2 Router                     */

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#define DN_RT_INFO_ENDN 0x03 /* EndNode                       */

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#define DN_RT_INFO_VERI 0x04 /* Verification Reqd.            */

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#define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved         */

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#define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */

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#define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */

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#define DN_RT_INFO_BLKR 0x40 /* Blocking Requested            */

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/*

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 * The fl structure is what we used to look up the route.

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 * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr

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 * except for local input routes, where the rt_saddr = fl.fld_dst and

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 * rt_daddr = fl.fld_src to allow the route to be used for returning

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 * packets to the originating host.

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 */

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struct dn_route {

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	struct dst_entry dst;

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	struct flowidn fld;

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	__le16 rt_saddr;

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	__le16 rt_daddr;

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	__le16 rt_gateway;

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	__le16 rt_local_src;	/* Source used for forwarding packets */

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	__le16 rt_src_map;

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	__le16 rt_dst_map;

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	unsigned rt_flags;

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	unsigned rt_type;

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};

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static inline bool dn_is_input_route(struct dn_route *rt)

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{

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	return rt->fld.flowidn_iif != 0;

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}

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static inline bool dn_is_output_route(struct dn_route *rt)

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{

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	return rt->fld.flowidn_iif == 0;

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}

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extern void dn_route_init(void);

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extern void dn_route_cleanup(void);

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#include <net/sock.h>

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#include <linux/if_arp.h>

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static inline void dn_rt_send(struct sk_buff *skb)

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{

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	dev_queue_xmit(skb);

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}

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static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)

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{

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	struct net_device *dev = skb->dev;

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	if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))

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		dst = NULL;

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	if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)

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		dn_rt_send(skb);

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	else

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		kfree_skb(skb);

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}

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#endif /* _NET_DN_ROUTE_H */

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