l2tp: add udp encap socket destroy handler
[linux-3.10.git] / net / l2tp / l2tp_core.h
index 2efe1a3..8eb8f1d 100644 (file)
 #define L2TP_TUNNEL_MAGIC      0x42114DDA
 #define L2TP_SESSION_MAGIC     0x0C04EB7D
 
+/* Per tunnel, session hash table size */
 #define L2TP_HASH_BITS 4
 #define L2TP_HASH_SIZE (1 << L2TP_HASH_BITS)
 
+/* System-wide, session hash table size */
+#define L2TP_HASH_BITS_2       8
+#define L2TP_HASH_SIZE_2       (1 << L2TP_HASH_BITS_2)
+
 /* Debug message categories for the DEBUG socket option */
 enum {
        L2TP_MSG_DEBUG          = (1 << 0),     /* verbose debug (if
@@ -39,6 +44,8 @@ struct l2tp_stats {
        u64                     rx_seq_discards;
        u64                     rx_oos_packets;
        u64                     rx_errors;
+       u64                     rx_cookie_discards;
+       struct u64_stats_sync   syncp;
 };
 
 struct l2tp_tunnel;
@@ -47,25 +54,33 @@ struct l2tp_tunnel;
  * packets and transmit outgoing ones.
  */
 struct l2tp_session_cfg {
-       unsigned                data_seq:2;     /* data sequencing level
+       enum l2tp_pwtype        pw_type;
+       unsigned int            data_seq:2;     /* data sequencing level
                                                 * 0 => none, 1 => IP only,
                                                 * 2 => all
                                                 */
-       unsigned                recv_seq:1;     /* expect receive packets with
+       unsigned int            recv_seq:1;     /* expect receive packets with
                                                 * sequence numbers? */
-       unsigned                send_seq:1;     /* send packets with sequence
+       unsigned int            send_seq:1;     /* send packets with sequence
                                                 * numbers? */
-       unsigned                lns_mode:1;     /* behave as LNS? LAC enables
+       unsigned int            lns_mode:1;     /* behave as LNS? LAC enables
                                                 * sequence numbers under
                                                 * control of LNS. */
        int                     debug;          /* bitmask of debug message
                                                 * categories */
-       int                     offset;         /* offset to payload */
+       u16                     vlan_id;        /* VLAN pseudowire only */
+       u16                     offset;         /* offset to payload */
+       u16                     l2specific_len; /* Layer 2 specific length */
+       u16                     l2specific_type; /* Layer 2 specific type */
+       u8                      cookie[8];      /* optional cookie */
+       int                     cookie_len;     /* 0, 4 or 8 bytes */
+       u8                      peer_cookie[8]; /* peer's cookie */
+       int                     peer_cookie_len; /* 0, 4 or 8 bytes */
        int                     reorder_timeout; /* configured reorder timeout
                                                  * (in jiffies) */
        int                     mtu;
        int                     mru;
-       int                     hdr_len;
+       char                    *ifname;
 };
 
 struct l2tp_session {
@@ -76,38 +91,53 @@ struct l2tp_session {
                                                 * context */
        u32                     session_id;
        u32                     peer_session_id;
-       u16                     nr;             /* session NR state (receive) */
-       u16                     ns;             /* session NR state (send) */
+       u8                      cookie[8];
+       int                     cookie_len;
+       u8                      peer_cookie[8];
+       int                     peer_cookie_len;
+       u16                     offset;         /* offset from end of L2TP header
+                                                  to beginning of data */
+       u16                     l2specific_len;
+       u16                     l2specific_type;
+       u16                     hdr_len;
+       u32                     nr;             /* session NR state (receive) */
+       u32                     ns;             /* session NR state (send) */
        struct sk_buff_head     reorder_q;      /* receive reorder queue */
        struct hlist_node       hlist;          /* Hash list node */
        atomic_t                ref_count;
 
        char                    name[32];       /* for logging */
-       unsigned                data_seq:2;     /* data sequencing level
+       char                    ifname[IFNAMSIZ];
+       unsigned int            data_seq:2;     /* data sequencing level
                                                 * 0 => none, 1 => IP only,
                                                 * 2 => all
                                                 */
-       unsigned                recv_seq:1;     /* expect receive packets with
+       unsigned int            recv_seq:1;     /* expect receive packets with
                                                 * sequence numbers? */
-       unsigned                send_seq:1;     /* send packets with sequence
+       unsigned int            send_seq:1;     /* send packets with sequence
                                                 * numbers? */
-       unsigned                lns_mode:1;     /* behave as LNS? LAC enables
+       unsigned int            lns_mode:1;     /* behave as LNS? LAC enables
                                                 * sequence numbers under
                                                 * control of LNS. */
        int                     debug;          /* bitmask of debug message
                                                 * categories */
        int                     reorder_timeout; /* configured reorder timeout
                                                  * (in jiffies) */
+       int                     reorder_skip;   /* set if skip to next nr */
        int                     mtu;
        int                     mru;
-       int                     hdr_len;
+       enum l2tp_pwtype        pwtype;
        struct l2tp_stats       stats;
+       struct hlist_node       global_hlist;   /* Global hash list node */
 
+       int (*build_header)(struct l2tp_session *session, void *buf);
        void (*recv_skb)(struct l2tp_session *session, struct sk_buff *skb, int data_len);
        void (*session_close)(struct l2tp_session *session);
        void (*ref)(struct l2tp_session *session);
        void (*deref)(struct l2tp_session *session);
-
+#if defined(CONFIG_L2TP_DEBUGFS) || defined(CONFIG_L2TP_DEBUGFS_MODULE)
+       void (*show)(struct seq_file *m, void *priv);
+#endif
        uint8_t                 priv[0];        /* private data */
 };
 
@@ -117,10 +147,23 @@ struct l2tp_session {
 struct l2tp_tunnel_cfg {
        int                     debug;          /* bitmask of debug message
                                                 * categories */
+       enum l2tp_encap_type    encap;
+
+       /* Used only for kernel-created sockets */
+       struct in_addr          local_ip;
+       struct in_addr          peer_ip;
+#if IS_ENABLED(CONFIG_IPV6)
+       struct in6_addr         *local_ip6;
+       struct in6_addr         *peer_ip6;
+#endif
+       u16                     local_udp_port;
+       u16                     peer_udp_port;
+       unsigned int            use_udp_checksums:1;
 };
 
 struct l2tp_tunnel {
        int                     magic;          /* Should be L2TP_TUNNEL_MAGIC */
+       struct rcu_head rcu;
        rwlock_t                hlist_lock;     /* protect session_hlist */
        struct hlist_head       session_hlist[L2TP_HASH_SIZE];
                                                /* hashed list of sessions,
@@ -132,22 +175,32 @@ struct l2tp_tunnel {
        char                    name[20];       /* for logging */
        int                     debug;          /* bitmask of debug message
                                                 * categories */
-       int                     hdr_len;
+       enum l2tp_encap_type    encap;
        struct l2tp_stats       stats;
 
        struct list_head        list;           /* Keep a list of all tunnels */
        struct net              *l2tp_net;      /* the net we belong to */
 
        atomic_t                ref_count;
-
+#ifdef CONFIG_DEBUG_FS
+       void (*show)(struct seq_file *m, void *arg);
+#endif
        int (*recv_payload_hook)(struct sk_buff *skb);
        void (*old_sk_destruct)(struct sock *);
        struct sock             *sock;          /* Parent socket */
-       int                     fd;
+       int                     fd;             /* Parent fd, if tunnel socket
+                                                * was created by userspace */
+
+       struct work_struct      del_work;
 
        uint8_t                 priv[0];        /* private data */
 };
 
+struct l2tp_nl_cmd_ops {
+       int (*session_create)(struct net *net, u32 tunnel_id, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg);
+       int (*session_delete)(struct l2tp_session *session);
+};
+
 static inline void *l2tp_tunnel_priv(struct l2tp_tunnel *tunnel)
 {
        return &tunnel->priv[0];
@@ -178,50 +231,26 @@ out:
        return tunnel;
 }
 
-extern struct l2tp_session *l2tp_session_find(struct l2tp_tunnel *tunnel, u32 session_id);
+extern struct sock *l2tp_tunnel_sock_lookup(struct l2tp_tunnel *tunnel);
+extern void l2tp_tunnel_sock_put(struct sock *sk);
+extern struct l2tp_session *l2tp_session_find(struct net *net, struct l2tp_tunnel *tunnel, u32 session_id);
 extern struct l2tp_session *l2tp_session_find_nth(struct l2tp_tunnel *tunnel, int nth);
+extern struct l2tp_session *l2tp_session_find_by_ifname(struct net *net, char *ifname);
 extern struct l2tp_tunnel *l2tp_tunnel_find(struct net *net, u32 tunnel_id);
 extern struct l2tp_tunnel *l2tp_tunnel_find_nth(struct net *net, int nth);
 
 extern int l2tp_tunnel_create(struct net *net, int fd, int version, u32 tunnel_id, u32 peer_tunnel_id, struct l2tp_tunnel_cfg *cfg, struct l2tp_tunnel **tunnelp);
+extern int l2tp_tunnel_delete(struct l2tp_tunnel *tunnel);
 extern struct l2tp_session *l2tp_session_create(int priv_size, struct l2tp_tunnel *tunnel, u32 session_id, u32 peer_session_id, struct l2tp_session_cfg *cfg);
-extern void l2tp_tunnel_free(struct l2tp_tunnel *tunnel);
+extern int l2tp_session_delete(struct l2tp_session *session);
 extern void l2tp_session_free(struct l2tp_session *session);
-extern int l2tp_udp_recv_core(struct l2tp_tunnel *tunnel, struct sk_buff *skb, int (*payload_hook)(struct sk_buff *skb));
+extern void l2tp_recv_common(struct l2tp_session *session, struct sk_buff *skb, unsigned char *ptr, unsigned char *optr, u16 hdrflags, int length, int (*payload_hook)(struct sk_buff *skb));
 extern int l2tp_udp_encap_recv(struct sock *sk, struct sk_buff *skb);
 
-extern void l2tp_build_l2tp_header(struct l2tp_session *session, void *buf);
-extern int l2tp_xmit_core(struct l2tp_session *session, struct sk_buff *skb, size_t data_len);
 extern int l2tp_xmit_skb(struct l2tp_session *session, struct sk_buff *skb, int hdr_len);
-extern void l2tp_tunnel_destruct(struct sock *sk);
-extern void l2tp_tunnel_closeall(struct l2tp_tunnel *tunnel);
 
-/* Tunnel reference counts. Incremented per session that is added to
- * the tunnel.
- */
-static inline void l2tp_tunnel_inc_refcount_1(struct l2tp_tunnel *tunnel)
-{
-       atomic_inc(&tunnel->ref_count);
-}
-
-static inline void l2tp_tunnel_dec_refcount_1(struct l2tp_tunnel *tunnel)
-{
-       if (atomic_dec_and_test(&tunnel->ref_count))
-               l2tp_tunnel_free(tunnel);
-}
-#ifdef L2TP_REFCNT_DEBUG
-#define l2tp_tunnel_inc_refcount(_t) do { \
-               printk(KERN_DEBUG "l2tp_tunnel_inc_refcount: %s:%d %s: cnt=%d\n", __func__, __LINE__, (_t)->name, atomic_read(&_t->ref_count)); \
-               l2tp_tunnel_inc_refcount_1(_t);                         \
-       } while (0)
-#define l2tp_tunnel_dec_refcount(_t) do { \
-               printk(KERN_DEBUG "l2tp_tunnel_dec_refcount: %s:%d %s: cnt=%d\n", __func__, __LINE__, (_t)->name, atomic_read(&_t->ref_count)); \
-               l2tp_tunnel_dec_refcount_1(_t);                         \
-       } while (0)
-#else
-#define l2tp_tunnel_inc_refcount(t) l2tp_tunnel_inc_refcount_1(t)
-#define l2tp_tunnel_dec_refcount(t) l2tp_tunnel_dec_refcount_1(t)
-#endif
+extern int l2tp_nl_register_ops(enum l2tp_pwtype pw_type, const struct l2tp_nl_cmd_ops *ops);
+extern void l2tp_nl_unregister_ops(enum l2tp_pwtype pw_type);
 
 /* Session reference counts. Incremented when code obtains a reference
  * to a session.
@@ -238,17 +267,36 @@ static inline void l2tp_session_dec_refcount_1(struct l2tp_session *session)
 }
 
 #ifdef L2TP_REFCNT_DEBUG
-#define l2tp_session_inc_refcount(_s) do { \
-               printk(KERN_DEBUG "l2tp_session_inc_refcount: %s:%d %s: cnt=%d\n", __func__, __LINE__, (_s)->name, atomic_read(&_s->ref_count)); \
-               l2tp_session_inc_refcount_1(_s);                                \
-       } while (0)
-#define l2tp_session_dec_refcount(_s) do { \
-               printk(KERN_DEBUG "l2tp_session_dec_refcount: %s:%d %s: cnt=%d\n", __func__, __LINE__, (_s)->name, atomic_read(&_s->ref_count)); \
-               l2tp_session_dec_refcount_1(_s);                                \
-       } while (0)
+#define l2tp_session_inc_refcount(_s)                                  \
+do {                                                                   \
+       pr_debug("l2tp_session_inc_refcount: %s:%d %s: cnt=%d\n",       \
+                __func__, __LINE__, (_s)->name,                        \
+                atomic_read(&_s->ref_count));                          \
+       l2tp_session_inc_refcount_1(_s);                                \
+} while (0)
+#define l2tp_session_dec_refcount(_s)                                  \
+do {                                                                   \
+       pr_debug("l2tp_session_dec_refcount: %s:%d %s: cnt=%d\n",       \
+                __func__, __LINE__, (_s)->name,                        \
+                atomic_read(&_s->ref_count));                          \
+       l2tp_session_dec_refcount_1(_s);                                \
+} while (0)
 #else
 #define l2tp_session_inc_refcount(s) l2tp_session_inc_refcount_1(s)
 #define l2tp_session_dec_refcount(s) l2tp_session_dec_refcount_1(s)
 #endif
 
+#define l2tp_printk(ptr, type, func, fmt, ...)                         \
+do {                                                                   \
+       if (((ptr)->debug) & (type))                                    \
+               func(fmt, ##__VA_ARGS__);                               \
+} while (0)
+
+#define l2tp_warn(ptr, type, fmt, ...)                                 \
+       l2tp_printk(ptr, type, pr_warn, fmt, ##__VA_ARGS__)
+#define l2tp_info(ptr, type, fmt, ...)                                 \
+       l2tp_printk(ptr, type, pr_info, fmt, ##__VA_ARGS__)
+#define l2tp_dbg(ptr, type, fmt, ...)                                  \
+       l2tp_printk(ptr, type, pr_debug, fmt, ##__VA_ARGS__)
+
 #endif /* _L2TP_CORE_H_ */