include/linux/sunrpc/svc_xprt.h

   1 /*
   2  * linux/include/linux/sunrpc/svc_xprt.h
   3  *
   4  * RPC server transport I/O
   5  */
   6
   7 #ifndef SUNRPC_SVC_XPRT_H
   8 #define SUNRPC_SVC_XPRT_H
   9
  10 #include <linux/sunrpc/svc.h>
  11
  12 struct module;
  13
  14 struct svc_xprt_ops {
  15         struct svc_xprt *(*xpo_create)(struct svc_serv *,
  16                                        struct net *net,
  17                                        struct sockaddr *, int,
  18                                        int);
  19         struct svc_xprt *(*xpo_accept)(struct svc_xprt *);
  20         int             (*xpo_has_wspace)(struct svc_xprt *);
  21         int             (*xpo_recvfrom)(struct svc_rqst *);
  22         void            (*xpo_prep_reply_hdr)(struct svc_rqst *);
  23         int             (*xpo_sendto)(struct svc_rqst *);
  24         void            (*xpo_release_rqst)(struct svc_rqst *);
  25         void            (*xpo_detach)(struct svc_xprt *);
  26         void            (*xpo_free)(struct svc_xprt *);
  27         int             (*xpo_secure_port)(struct svc_rqst *);
  28 };
  29
  30 struct svc_xprt_class {
  31         const char              *xcl_name;
  32         struct module           *xcl_owner;
  33         struct svc_xprt_ops     *xcl_ops;
  34         struct list_head        xcl_list;
  35         u32                     xcl_max_payload;
  36 };
  37
  38 /*
  39  * This is embedded in an object that wants a callback before deleting
  40  * an xprt; intended for use by NFSv4.1, which needs to know when a
  41  * client's tcp connection (and hence possibly a backchannel) goes away.
  42  */
  43 struct svc_xpt_user {
  44         struct list_head list;
  45         void (*callback)(struct svc_xpt_user *);
  46 };
  47
  48 struct svc_xprt {
  49         struct svc_xprt_class   *xpt_class;
  50         struct svc_xprt_ops     *xpt_ops;
  51         struct kref             xpt_ref;
  52         struct list_head        xpt_list;
  53         struct list_head        xpt_ready;
  54         unsigned long           xpt_flags;
  55 #define XPT_BUSY        0               /* enqueued/receiving */
  56 #define XPT_CONN        1               /* conn pending */
  57 #define XPT_CLOSE       2               /* dead or dying */
  58 #define XPT_DATA        3               /* data pending */
  59 #define XPT_TEMP        4               /* connected transport */
  60 #define XPT_DEAD        6               /* transport closed */
  61 #define XPT_CHNGBUF     7               /* need to change snd/rcv buf sizes */
  62 #define XPT_DEFERRED    8               /* deferred request pending */
  63 #define XPT_OLD         9               /* used for xprt aging mark+sweep */
  64 #define XPT_DETACHED    10              /* detached from tempsocks list */
  65 #define XPT_LISTENER    11              /* listening endpoint */
  66 #define XPT_CACHE_AUTH  12              /* cache auth info */
  67
  68         struct svc_serv         *xpt_server;    /* service for transport */
  69         atomic_t                xpt_reserved;   /* space on outq that is rsvd */
  70         struct mutex            xpt_mutex;      /* to serialize sending data */
  71         spinlock_t              xpt_lock;       /* protects sk_deferred
  72                                                  * and xpt_auth_cache */
  73         void                    *xpt_auth_cache;/* auth cache */
  74         struct list_head        xpt_deferred;   /* deferred requests that need
  75                                                  * to be revisted */
  76         struct sockaddr_storage xpt_local;      /* local address */
  77         size_t                  xpt_locallen;   /* length of address */
  78         struct sockaddr_storage xpt_remote;     /* remote peer's address */
  79         size_t                  xpt_remotelen;  /* length of address */
  80         struct rpc_wait_queue   xpt_bc_pending; /* backchannel wait queue */
  81         struct list_head        xpt_users;      /* callbacks on free */
  82
  83         struct net              *xpt_net;
  84         struct rpc_xprt         *xpt_bc_xprt;   /* NFSv4.1 backchannel */
  85 };
  86
  87 static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
  88 {
  89         spin_lock(&xpt->xpt_lock);
  90         list_del_init(&u->list);
  91         spin_unlock(&xpt->xpt_lock);
  92 }
  93
  94 static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
  95 {
  96         spin_lock(&xpt->xpt_lock);
  97         if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
  98                 /*
  99                  * The connection is about to be deleted soon (or,
 100                  * worse, may already be deleted--in which case we've
 101                  * already notified the xpt_users).
 102                  */
 103                 spin_unlock(&xpt->xpt_lock);
 104                 return -ENOTCONN;
 105         }
 106         list_add(&u->list, &xpt->xpt_users);
 107         spin_unlock(&xpt->xpt_lock);
 108         return 0;
 109 }
 110
 111 int     svc_reg_xprt_class(struct svc_xprt_class *);
 112 void    svc_unreg_xprt_class(struct svc_xprt_class *);
 113 void    svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *,
 114                       struct svc_serv *);
 115 int     svc_create_xprt(struct svc_serv *, const char *, struct net *,
 116                         const int, const unsigned short, int);
 117 void    svc_xprt_enqueue(struct svc_xprt *xprt);
 118 void    svc_xprt_put(struct svc_xprt *xprt);
 119 void    svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
 120 void    svc_close_xprt(struct svc_xprt *xprt);
 121 int     svc_port_is_privileged(struct sockaddr *sin);
 122 int     svc_print_xprts(char *buf, int maxlen);
 123 struct  svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
 124                         struct net *net, const sa_family_t af,
 125                         const unsigned short port);
 126 int     svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
 127 void    svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt);
 128
 129 static inline void svc_xprt_get(struct svc_xprt *xprt)
 130 {
 131         kref_get(&xprt->xpt_ref);
 132 }
 133 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
 134                                       const struct sockaddr *sa,
 135                                       const size_t salen)
 136 {
 137         memcpy(&xprt->xpt_local, sa, salen);
 138         xprt->xpt_locallen = salen;
 139 }
 140 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
 141                                        const struct sockaddr *sa,
 142                                        const size_t salen)
 143 {
 144         memcpy(&xprt->xpt_remote, sa, salen);
 145         xprt->xpt_remotelen = salen;
 146 }
 147 static inline unsigned short svc_addr_port(const struct sockaddr *sa)
 148 {
 149         const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
 150         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
 151
 152         switch (sa->sa_family) {
 153         case AF_INET:
 154                 return ntohs(sin->sin_port);
 155         case AF_INET6:
 156                 return ntohs(sin6->sin6_port);
 157         }
 158
 159         return 0;
 160 }
 161
 162 static inline size_t svc_addr_len(const struct sockaddr *sa)
 163 {
 164         switch (sa->sa_family) {
 165         case AF_INET:
 166                 return sizeof(struct sockaddr_in);
 167         case AF_INET6:
 168                 return sizeof(struct sockaddr_in6);
 169         }
 170         BUG();
 171 }
 172
 173 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
 174 {
 175         return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
 176 }
 177
 178 static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
 179 {
 180         return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
 181 }
 182
 183 static inline char *__svc_print_addr(const struct sockaddr *addr,
 184                                      char *buf, const size_t len)
 185 {
 186         const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
 187         const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
 188
 189         switch (addr->sa_family) {
 190         case AF_INET:
 191                 snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
 192                         ntohs(sin->sin_port));
 193                 break;
 194
 195         case AF_INET6:
 196                 snprintf(buf, len, "%pI6, port=%u",
 197                          &sin6->sin6_addr,
 198                         ntohs(sin6->sin6_port));
 199                 break;
 200
 201         default:
 202                 snprintf(buf, len, "unknown address type: %d", addr->sa_family);
 203                 break;
 204         }
 205
 206         return buf;
 207 }
 208 #endif /* SUNRPC_SVC_XPRT_H */