include/net/garp.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _NET_GARP_H
   3 #define _NET_GARP_H
   4
   5 #include <linux/if_ether.h>
   6 #include <linux/types.h>
   7 #include <net/stp.h>
   8
   9 #define GARP_PROTOCOL_ID        0x1
  10 #define GARP_END_MARK           0x0
  11
  12 struct garp_pdu_hdr {
  13         __be16  protocol;
  14 };
  15
  16 struct garp_msg_hdr {
  17         u8      attrtype;
  18 };
  19
  20 enum garp_attr_event {
  21         GARP_LEAVE_ALL,
  22         GARP_JOIN_EMPTY,
  23         GARP_JOIN_IN,
  24         GARP_LEAVE_EMPTY,
  25         GARP_LEAVE_IN,
  26         GARP_EMPTY,
  27 };
  28
  29 struct garp_attr_hdr {
  30         u8      len;
  31         u8      event;
  32         u8      data[];
  33 };
  34
  35 struct garp_skb_cb {
  36         u8      cur_type;
  37 };
  38
  39 static inline struct garp_skb_cb *garp_cb(struct sk_buff *skb)
  40 {
  41         BUILD_BUG_ON(sizeof(struct garp_skb_cb) >
  42                      sizeof_field(struct sk_buff, cb));
  43         return (struct garp_skb_cb *)skb->cb;
  44 }
  45
  46 enum garp_applicant_state {
  47         GARP_APPLICANT_INVALID,
  48         GARP_APPLICANT_VA,
  49         GARP_APPLICANT_AA,
  50         GARP_APPLICANT_QA,
  51         GARP_APPLICANT_LA,
  52         GARP_APPLICANT_VP,
  53         GARP_APPLICANT_AP,
  54         GARP_APPLICANT_QP,
  55         GARP_APPLICANT_VO,
  56         GARP_APPLICANT_AO,
  57         GARP_APPLICANT_QO,
  58         __GARP_APPLICANT_MAX
  59 };
  60 #define GARP_APPLICANT_MAX      (__GARP_APPLICANT_MAX - 1)
  61
  62 enum garp_event {
  63         GARP_EVENT_REQ_JOIN,
  64         GARP_EVENT_REQ_LEAVE,
  65         GARP_EVENT_R_JOIN_IN,
  66         GARP_EVENT_R_JOIN_EMPTY,
  67         GARP_EVENT_R_EMPTY,
  68         GARP_EVENT_R_LEAVE_IN,
  69         GARP_EVENT_R_LEAVE_EMPTY,
  70         GARP_EVENT_TRANSMIT_PDU,
  71         __GARP_EVENT_MAX
  72 };
  73 #define GARP_EVENT_MAX          (__GARP_EVENT_MAX - 1)
  74
  75 enum garp_action {
  76         GARP_ACTION_NONE,
  77         GARP_ACTION_S_JOIN_IN,
  78         GARP_ACTION_S_LEAVE_EMPTY,
  79 };
  80
  81 struct garp_attr {
  82         struct rb_node                  node;
  83         enum garp_applicant_state       state;
  84         u8                              type;
  85         u8                              dlen;
  86         unsigned char                   data[];
  87 };
  88
  89 enum garp_applications {
  90         GARP_APPLICATION_GVRP,
  91         __GARP_APPLICATION_MAX
  92 };
  93 #define GARP_APPLICATION_MAX    (__GARP_APPLICATION_MAX - 1)
  94
  95 struct garp_application {
  96         enum garp_applications  type;
  97         unsigned int            maxattr;
  98         struct stp_proto        proto;
  99 };
 100
 101 struct garp_applicant {
 102         struct garp_application *app;
 103         struct net_device       *dev;
 104         struct timer_list       join_timer;
 105
 106         spinlock_t              lock;
 107         struct sk_buff_head     queue;
 108         struct sk_buff          *pdu;
 109         struct rb_root          gid;
 110         struct rcu_head         rcu;
 111 };
 112
 113 struct garp_port {
 114         struct garp_applicant __rcu     *applicants[GARP_APPLICATION_MAX + 1];
 115         struct rcu_head                 rcu;
 116 };
 117
 118 int garp_register_application(struct garp_application *app);
 119 void garp_unregister_application(struct garp_application *app);
 120
 121 int garp_init_applicant(struct net_device *dev, struct garp_application *app);
 122 void garp_uninit_applicant(struct net_device *dev,
 123                            struct garp_application *app);
 124
 125 int garp_request_join(const struct net_device *dev,
 126                       const struct garp_application *app, const void *data,
 127                       u8 len, u8 type);
 128 void garp_request_leave(const struct net_device *dev,
 129                         const struct garp_application *app,
 130                         const void *data, u8 len, u8 type);
 131
 132 #endif /* _NET_GARP_H */