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 void (*xpo_adjust_wspace)(struct svc_xprt *); 29 }; 30 31 struct svc_xprt_class { 32 const char *xcl_name; 33 struct module *xcl_owner; 34 struct svc_xprt_ops *xcl_ops; 35 struct list_head xcl_list; 36 u32 xcl_max_payload; 37 int xcl_ident; 38 }; 39 40 /* 41 * This is embedded in an object that wants a callback before deleting 42 * an xprt; intended for use by NFSv4.1, which needs to know when a 43 * client's tcp connection (and hence possibly a backchannel) goes away. 44 */ 45 struct svc_xpt_user { 46 struct list_head list; 47 void (*callback)(struct svc_xpt_user *); 48 }; 49 50 struct svc_xprt { 51 struct svc_xprt_class *xpt_class; 52 struct svc_xprt_ops *xpt_ops; 53 struct kref xpt_ref; 54 struct list_head xpt_list; 55 struct list_head xpt_ready; 56 unsigned long xpt_flags; 57 #define XPT_BUSY 0 /* enqueued/receiving */ 58 #define XPT_CONN 1 /* conn pending */ 59 #define XPT_CLOSE 2 /* dead or dying */ 60 #define XPT_DATA 3 /* data pending */ 61 #define XPT_TEMP 4 /* connected transport */ 62 #define XPT_DEAD 6 /* transport closed */ 63 #define XPT_CHNGBUF 7 /* need to change snd/rcv buf sizes */ 64 #define XPT_DEFERRED 8 /* deferred request pending */ 65 #define XPT_OLD 9 /* used for xprt aging mark+sweep */ 66 #define XPT_LISTENER 10 /* listening endpoint */ 67 #define XPT_CACHE_AUTH 11 /* cache auth info */ 68 #define XPT_LOCAL 12 /* connection from loopback interface */ 69 70 struct svc_serv *xpt_server; /* service for transport */ 71 atomic_t xpt_reserved; /* space on outq that is rsvd */ 72 struct mutex xpt_mutex; /* to serialize sending data */ 73 spinlock_t xpt_lock; /* protects sk_deferred 74 * and xpt_auth_cache */ 75 void *xpt_auth_cache;/* auth cache */ 76 struct list_head xpt_deferred; /* deferred requests that need 77 * to be revisted */ 78 struct sockaddr_storage xpt_local; /* local address */ 79 size_t xpt_locallen; /* length of address */ 80 struct sockaddr_storage xpt_remote; /* remote peer's address */ 81 size_t xpt_remotelen; /* length of address */ 82 struct rpc_wait_queue xpt_bc_pending; /* backchannel wait queue */ 83 struct list_head xpt_users; /* callbacks on free */ 84 85 struct net *xpt_net; 86 struct rpc_xprt *xpt_bc_xprt; /* NFSv4.1 backchannel */ 87 }; 88 89 static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u) 90 { 91 spin_lock(&xpt->xpt_lock); 92 list_del_init(&u->list); 93 spin_unlock(&xpt->xpt_lock); 94 } 95 96 static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u) 97 { 98 spin_lock(&xpt->xpt_lock); 99 if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) { 100 /* 101 * The connection is about to be deleted soon (or, 102 * worse, may already be deleted--in which case we've 103 * already notified the xpt_users). 104 */ 105 spin_unlock(&xpt->xpt_lock); 106 return -ENOTCONN; 107 } 108 list_add(&u->list, &xpt->xpt_users); 109 spin_unlock(&xpt->xpt_lock); 110 return 0; 111 } 112 113 int svc_reg_xprt_class(struct svc_xprt_class *); 114 void svc_unreg_xprt_class(struct svc_xprt_class *); 115 void svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *, 116 struct svc_serv *); 117 int svc_create_xprt(struct svc_serv *, const char *, struct net *, 118 const int, const unsigned short, int); 119 void svc_xprt_do_enqueue(struct svc_xprt *xprt); 120 void svc_xprt_enqueue(struct svc_xprt *xprt); 121 void svc_xprt_put(struct svc_xprt *xprt); 122 void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt); 123 void svc_close_xprt(struct svc_xprt *xprt); 124 int svc_port_is_privileged(struct sockaddr *sin); 125 int svc_print_xprts(char *buf, int maxlen); 126 struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name, 127 struct net *net, const sa_family_t af, 128 const unsigned short port); 129 int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen); 130 void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt); 131 132 static inline void svc_xprt_get(struct svc_xprt *xprt) 133 { 134 kref_get(&xprt->xpt_ref); 135 } 136 static inline void svc_xprt_set_local(struct svc_xprt *xprt, 137 const struct sockaddr *sa, 138 const size_t salen) 139 { 140 memcpy(&xprt->xpt_local, sa, salen); 141 xprt->xpt_locallen = salen; 142 } 143 static inline void svc_xprt_set_remote(struct svc_xprt *xprt, 144 const struct sockaddr *sa, 145 const size_t salen) 146 { 147 memcpy(&xprt->xpt_remote, sa, salen); 148 xprt->xpt_remotelen = salen; 149 } 150 static inline unsigned short svc_addr_port(const struct sockaddr *sa) 151 { 152 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa; 153 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa; 154 155 switch (sa->sa_family) { 156 case AF_INET: 157 return ntohs(sin->sin_port); 158 case AF_INET6: 159 return ntohs(sin6->sin6_port); 160 } 161 162 return 0; 163 } 164 165 static inline size_t svc_addr_len(const struct sockaddr *sa) 166 { 167 switch (sa->sa_family) { 168 case AF_INET: 169 return sizeof(struct sockaddr_in); 170 case AF_INET6: 171 return sizeof(struct sockaddr_in6); 172 } 173 BUG(); 174 } 175 176 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt) 177 { 178 return svc_addr_port((const struct sockaddr *)&xprt->xpt_local); 179 } 180 181 static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt) 182 { 183 return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote); 184 } 185 186 static inline char *__svc_print_addr(const struct sockaddr *addr, 187 char *buf, const size_t len) 188 { 189 const struct sockaddr_in *sin = (const struct sockaddr_in *)addr; 190 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr; 191 192 switch (addr->sa_family) { 193 case AF_INET: 194 snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr, 195 ntohs(sin->sin_port)); 196 break; 197 198 case AF_INET6: 199 snprintf(buf, len, "%pI6, port=%u", 200 &sin6->sin6_addr, 201 ntohs(sin6->sin6_port)); 202 break; 203 204 default: 205 snprintf(buf, len, "unknown address type: %d", addr->sa_family); 206 break; 207 } 208 209 return buf; 210 } 211 #endif /* SUNRPC_SVC_XPRT_H */ 212