net: Add GARP applicant-only participant

Add an implementation of the GARP (Generic Attribute Registration Protocol)
applicant-only participant. This will be used by the following patch to
add GVRP support to the VLAN code.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 127 insertions, 0 deletions

diff --git a/include/net/garp.h b/include/net/garp.h
new file mode 100644
index 000000000000..73c772395f5b
--- /dev/null
+++ b/include/net/garp.h
@@ -0,0 +1,127 @@
+#ifndef _NET_GARP_H
+#define _NET_GARP_H
+
+#include <net/stp.h>
+
+#define GARP_PROTOCOL_ID        0x1
+#define GARP_END_MARK           0x0
+
+struct garp_pdu_hdr {
+        __be16  protocol;
+};
+
+struct garp_msg_hdr {
+        u8      attrtype;
+};
+
+enum garp_attr_event {
+        GARP_LEAVE_ALL,
+        GARP_JOIN_EMPTY,
+        GARP_JOIN_IN,
+        GARP_LEAVE_EMPTY,
+        GARP_LEAVE_IN,
+        GARP_EMPTY,
+};
+
+struct garp_attr_hdr {
+        u8      len;
+        u8      event;
+        u8      data[];
+};
+
+struct garp_skb_cb {
+        u8      cur_type;
+};
+
+static inline struct garp_skb_cb *garp_cb(struct sk_buff *skb)
+{
+        BUILD_BUG_ON(sizeof(struct garp_skb_cb) >
+                     FIELD_SIZEOF(struct sk_buff, cb));
+        return (struct garp_skb_cb *)skb->cb;
+}
+
+enum garp_applicant_state {
+        GARP_APPLICANT_INVALID,
+        GARP_APPLICANT_VA,
+        GARP_APPLICANT_AA,
+        GARP_APPLICANT_QA,
+        GARP_APPLICANT_LA,
+        GARP_APPLICANT_VP,
+        GARP_APPLICANT_AP,
+        GARP_APPLICANT_QP,
+        GARP_APPLICANT_VO,
+        GARP_APPLICANT_AO,
+        GARP_APPLICANT_QO,
+        __GARP_APPLICANT_MAX
+};
+#define GARP_APPLICANT_MAX      (__GARP_APPLICANT_MAX - 1)
+
+enum garp_event {
+        GARP_EVENT_REQ_JOIN,
+        GARP_EVENT_REQ_LEAVE,
+        GARP_EVENT_R_JOIN_IN,
+        GARP_EVENT_R_JOIN_EMPTY,
+        GARP_EVENT_R_EMPTY,
+        GARP_EVENT_R_LEAVE_IN,
+        GARP_EVENT_R_LEAVE_EMPTY,
+        GARP_EVENT_TRANSMIT_PDU,
+        __GARP_EVENT_MAX
+};
+#define GARP_EVENT_MAX          (__GARP_EVENT_MAX - 1)
+
+enum garp_action {
+        GARP_ACTION_NONE,
+        GARP_ACTION_S_JOIN_IN,
+        GARP_ACTION_S_LEAVE_EMPTY,
+};
+
+struct garp_attr {
+        struct rb_node                  node;
+        enum garp_applicant_state       state;
+        u8                              type;
+        u8                              dlen;
+        unsigned char                   data[];
+};
+
+enum garp_applications {
+        __GARP_APPLICATION_MAX
+};
+#define GARP_APPLICATION_MAX    (__GARP_APPLICATION_MAX - 1)
+
+struct garp_application {
+        enum garp_applications  type;
+        unsigned int            maxattr;
+        struct stp_proto        proto;
+};
+
+struct garp_applicant {
+        struct garp_application *app;
+        struct net_device       *dev;
+        struct timer_list       join_timer;
+
+        spinlock_t              lock;
+        struct sk_buff_head     queue;
+        struct sk_buff          *pdu;
+        struct rb_root          gid;
+};
+
+struct garp_port {
+        struct garp_applicant   *applicants[GARP_APPLICATION_MAX + 1];
+};
+
+extern int      garp_register_application(struct garp_application *app);
+extern void     garp_unregister_application(struct garp_application *app);
+
+extern int      garp_init_applicant(struct net_device *dev,
+                                    struct garp_application *app);
+extern void     garp_uninit_applicant(struct net_device *dev,
+                                      struct garp_application *app);
+
+extern int      garp_request_join(const struct net_device *dev,
+                                  const struct garp_application *app,
+                                  const void *data, u8 len, u8 type);
+extern void     garp_request_leave(const struct net_device *dev,
+                                   const struct garp_application *app,
+                                   const void *data, u8 len, u8 type);
+
+#endif /* _NET_GARP_H */