include/net/dn_route.h

0001 /* SPDX-License-Identifier: GPL-2.0-or-later */
0002 #ifndef _NET_DN_ROUTE_H
0003 #define _NET_DN_ROUTE_H
0004
0005 /******************************************************************************
0006     (c) 1995-1998 E.M. Serrat       emserrat@geocities.com
0007
0008 *******************************************************************************/
0009
0010 #include <linux/types.h>
0011 #include <net/dst.h>
0012
0013 struct sk_buff *dn_alloc_skb(struct sock *sk, int size, gfp_t pri);
0014 int dn_route_output_sock(struct dst_entry __rcu **pprt, struct flowidn *,
0015              struct sock *sk, int flags);
0016 int dn_cache_dump(struct sk_buff *skb, struct netlink_callback *cb);
0017 void dn_rt_cache_flush(int delay);
0018 int dn_route_rcv(struct sk_buff *skb, struct net_device *dev,
0019          struct packet_type *pt, struct net_device *orig_dev);
0020
0021 /* Masks for flags field */
0022 #define DN_RT_F_PID 0x07 /* Mask for packet type                      */
0023 #define DN_RT_F_PF  0x80 /* Padding Follows                           */
0024 #define DN_RT_F_VER 0x40 /* Version =0 discard packet if ==1          */
0025 #define DN_RT_F_IE  0x20 /* Intra Ethernet, Reserved in short pkt     */
0026 #define DN_RT_F_RTS 0x10 /* Packet is being returned to sender        */
0027 #define DN_RT_F_RQR 0x08 /* Return packet to sender upon non-delivery */
0028
0029 /* Mask for types of routing packets */
0030 #define DN_RT_PKT_MSK   0x06
0031 /* Types of routing packets */
0032 #define DN_RT_PKT_SHORT 0x02 /* Short routing packet */
0033 #define DN_RT_PKT_LONG  0x06 /* Long routing packet  */
0034
0035 /* Mask for control/routing selection */
0036 #define DN_RT_PKT_CNTL  0x01 /* Set to 1 if a control packet  */
0037 /* Types of control packets */
0038 #define DN_RT_CNTL_MSK  0x0f /* Mask for control packets      */
0039 #define DN_RT_PKT_INIT  0x01 /* Initialisation packet         */
0040 #define DN_RT_PKT_VERI  0x03 /* Verification Message          */
0041 #define DN_RT_PKT_HELO  0x05 /* Hello and Test Message        */
0042 #define DN_RT_PKT_L1RT  0x07 /* Level 1 Routing Message       */
0043 #define DN_RT_PKT_L2RT  0x09 /* Level 2 Routing Message       */
0044 #define DN_RT_PKT_ERTH  0x0b /* Ethernet Router Hello         */
0045 #define DN_RT_PKT_EEDH  0x0d /* Ethernet EndNode Hello        */
0046
0047 /* Values for info field in hello message */
0048 #define DN_RT_INFO_TYPE 0x03 /* Type mask                     */
0049 #define DN_RT_INFO_L1RT 0x02 /* L1 Router                     */
0050 #define DN_RT_INFO_L2RT 0x01 /* L2 Router                     */
0051 #define DN_RT_INFO_ENDN 0x03 /* EndNode                       */
0052 #define DN_RT_INFO_VERI 0x04 /* Verification Reqd.            */
0053 #define DN_RT_INFO_RJCT 0x08 /* Reject Flag, Reserved         */
0054 #define DN_RT_INFO_VFLD 0x10 /* Verification Failed, Reserved */
0055 #define DN_RT_INFO_NOML 0x20 /* No Multicast traffic accepted */
0056 #define DN_RT_INFO_BLKR 0x40 /* Blocking Requested            */
0057
0058 /*
0059  * The fl structure is what we used to look up the route.
0060  * The rt_saddr & rt_daddr entries are the same as key.saddr & key.daddr
0061  * except for local input routes, where the rt_saddr = fl.fld_dst and
0062  * rt_daddr = fl.fld_src to allow the route to be used for returning
0063  * packets to the originating host.
0064  */
0065 struct dn_route {
0066     struct dst_entry dst;
0067     struct dn_route __rcu *dn_next;
0068
0069     struct neighbour *n;
0070
0071     struct flowidn fld;
0072
0073     __le16 rt_saddr;
0074     __le16 rt_daddr;
0075     __le16 rt_gateway;
0076     __le16 rt_local_src;    /* Source used for forwarding packets */
0077     __le16 rt_src_map;
0078     __le16 rt_dst_map;
0079
0080     unsigned int rt_flags;
0081     unsigned int rt_type;
0082 };
0083
0084 static inline bool dn_is_input_route(struct dn_route *rt)
0085 {
0086     return rt->fld.flowidn_iif != 0;
0087 }
0088
0089 static inline bool dn_is_output_route(struct dn_route *rt)
0090 {
0091     return rt->fld.flowidn_iif == 0;
0092 }
0093
0094 void dn_route_init(void);
0095 void dn_route_cleanup(void);
0096
0097 #include <net/sock.h>
0098 #include <linux/if_arp.h>
0099
0100 static inline void dn_rt_send(struct sk_buff *skb)
0101 {
0102     dev_queue_xmit(skb);
0103 }
0104
0105 static inline void dn_rt_finish_output(struct sk_buff *skb, char *dst, char *src)
0106 {
0107     struct net_device *dev = skb->dev;
0108
0109     if ((dev->type != ARPHRD_ETHER) && (dev->type != ARPHRD_LOOPBACK))
0110         dst = NULL;
0111
0112     if (dev_hard_header(skb, dev, ETH_P_DNA_RT, dst, src, skb->len) >= 0)
0113         dn_rt_send(skb);
0114     else
0115         kfree_skb(skb);
0116 }
0117
0118 #endif /* _NET_DN_ROUTE_H */