1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3 * linux/include/linux/sunrpc/svc_xprt.h
4 *
5 * RPC server transport I/O
6 */
7
8 #ifndef SUNRPC_SVC_XPRT_H
9 #define SUNRPC_SVC_XPRT_H
10
11 #include <linux/sunrpc/svc.h>
12
13 struct module;
14
15 struct svc_xprt_ops {
16 struct svc_xprt *(*xpo_create)(struct svc_serv *,
17 struct net *net,
18 struct sockaddr *, int,
19 int);
20 struct svc_xprt *(*xpo_accept)(struct svc_xprt *);
21 int (*xpo_has_wspace)(struct svc_xprt *);
22 int (*xpo_recvfrom)(struct svc_rqst *);
23 int (*xpo_sendto)(struct svc_rqst *);
24 int (*xpo_result_payload)(struct svc_rqst *, unsigned int,
25 unsigned int);
26 void (*xpo_release_rqst)(struct svc_rqst *);
27 void (*xpo_detach)(struct svc_xprt *);
28 void (*xpo_free)(struct svc_xprt *);
29 void (*xpo_kill_temp_xprt)(struct svc_xprt *);
30 void (*xpo_start_tls)(struct svc_xprt *);
31 };
32
33 struct svc_xprt_class {
34 const char *xcl_name;
35 struct module *xcl_owner;
36 const struct svc_xprt_ops *xcl_ops;
37 struct list_head xcl_list;
38 u32 xcl_max_payload;
39 int xcl_ident;
40 };
41
42 /*
43 * This is embedded in an object that wants a callback before deleting
44 * an xprt; intended for use by NFSv4.1, which needs to know when a
45 * client's tcp connection (and hence possibly a backchannel) goes away.
46 */
47 struct svc_xpt_user {
48 struct list_head list;
49 void (*callback)(struct svc_xpt_user *);
50 };
51
52 struct svc_xprt {
53 struct svc_xprt_class *xpt_class;
54 const struct svc_xprt_ops *xpt_ops;
55 struct kref xpt_ref;
56 struct list_head xpt_list;
57 struct list_head xpt_ready;
58 unsigned long xpt_flags;
59 #define XPT_BUSY 0 /* enqueued/receiving */
60 #define XPT_CONN 1 /* conn pending */
61 #define XPT_CLOSE 2 /* dead or dying */
62 #define XPT_DATA 3 /* data pending */
63 #define XPT_TEMP 4 /* connected transport */
64 #define XPT_DEAD 6 /* transport closed */
65 #define XPT_CHNGBUF 7 /* need to change snd/rcv buf sizes */
66 #define XPT_DEFERRED 8 /* deferred request pending */
67 #define XPT_OLD 9 /* used for xprt aging mark+sweep */
68 #define XPT_LISTENER 10 /* listening endpoint */
69 #define XPT_CACHE_AUTH 11 /* cache auth info */
70 #define XPT_LOCAL 12 /* connection from loopback interface */
71 #define XPT_KILL_TEMP 13 /* call xpo_kill_temp_xprt before closing */
72 #define XPT_CONG_CTRL 14 /* has congestion control */
73
74 struct svc_serv *xpt_server; /* service for transport */
75 atomic_t xpt_reserved; /* space on outq that is rsvd */
76 atomic_t xpt_nr_rqsts; /* Number of requests */
77 struct mutex xpt_mutex; /* to serialize sending data */
78 spinlock_t xpt_lock; /* protects sk_deferred
79 * and xpt_auth_cache */
80 void *xpt_auth_cache;/* auth cache */
81 struct list_head xpt_deferred; /* deferred requests that need
82 * to be revisted */
83 struct sockaddr_storage xpt_local; /* local address */
84 size_t xpt_locallen; /* length of address */
85 struct sockaddr_storage xpt_remote; /* remote peer's address */
86 size_t xpt_remotelen; /* length of address */
87 char xpt_remotebuf[INET6_ADDRSTRLEN + 10];
88 struct list_head xpt_users; /* callbacks on free */
89
90 struct net *xpt_net;
91 netns_tracker ns_tracker;
92 const struct cred *xpt_cred;
93 struct rpc_xprt *xpt_bc_xprt; /* NFSv4.1 backchannel */
94 struct rpc_xprt_switch *xpt_bc_xps; /* NFSv4.1 backchannel */
95 };
96
unregister_xpt_user(struct svc_xprt * xpt,struct svc_xpt_user * u)97 static inline void unregister_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
98 {
99 spin_lock(&xpt->xpt_lock);
100 list_del_init(&u->list);
101 spin_unlock(&xpt->xpt_lock);
102 }
103
register_xpt_user(struct svc_xprt * xpt,struct svc_xpt_user * u)104 static inline int register_xpt_user(struct svc_xprt *xpt, struct svc_xpt_user *u)
105 {
106 spin_lock(&xpt->xpt_lock);
107 if (test_bit(XPT_CLOSE, &xpt->xpt_flags)) {
108 /*
109 * The connection is about to be deleted soon (or,
110 * worse, may already be deleted--in which case we've
111 * already notified the xpt_users).
112 */
113 spin_unlock(&xpt->xpt_lock);
114 return -ENOTCONN;
115 }
116 list_add(&u->list, &xpt->xpt_users);
117 spin_unlock(&xpt->xpt_lock);
118 return 0;
119 }
120
svc_xprt_is_dead(const struct svc_xprt * xprt)121 static inline bool svc_xprt_is_dead(const struct svc_xprt *xprt)
122 {
123 return (test_bit(XPT_DEAD, &xprt->xpt_flags) != 0) ||
124 (test_bit(XPT_CLOSE, &xprt->xpt_flags) != 0);
125 }
126
127 int svc_reg_xprt_class(struct svc_xprt_class *);
128 void svc_unreg_xprt_class(struct svc_xprt_class *);
129 void svc_xprt_init(struct net *, struct svc_xprt_class *, struct svc_xprt *,
130 struct svc_serv *);
131 int svc_xprt_create(struct svc_serv *serv, const char *xprt_name,
132 struct net *net, const int family,
133 const unsigned short port, int flags,
134 const struct cred *cred);
135 void svc_xprt_destroy_all(struct svc_serv *serv, struct net *net);
136 void svc_xprt_received(struct svc_xprt *xprt);
137 void svc_xprt_enqueue(struct svc_xprt *xprt);
138 void svc_xprt_put(struct svc_xprt *xprt);
139 void svc_xprt_copy_addrs(struct svc_rqst *rqstp, struct svc_xprt *xprt);
140 void svc_xprt_close(struct svc_xprt *xprt);
141 int svc_port_is_privileged(struct sockaddr *sin);
142 int svc_print_xprts(char *buf, int maxlen);
143 struct svc_xprt *svc_find_xprt(struct svc_serv *serv, const char *xcl_name,
144 struct net *net, const sa_family_t af,
145 const unsigned short port);
146 int svc_xprt_names(struct svc_serv *serv, char *buf, const int buflen);
147 void svc_add_new_perm_xprt(struct svc_serv *serv, struct svc_xprt *xprt);
148 void svc_age_temp_xprts_now(struct svc_serv *, struct sockaddr *);
149 void svc_xprt_deferred_close(struct svc_xprt *xprt);
150
svc_xprt_get(struct svc_xprt * xprt)151 static inline void svc_xprt_get(struct svc_xprt *xprt)
152 {
153 kref_get(&xprt->xpt_ref);
154 }
svc_xprt_set_local(struct svc_xprt * xprt,const struct sockaddr * sa,const size_t salen)155 static inline void svc_xprt_set_local(struct svc_xprt *xprt,
156 const struct sockaddr *sa,
157 const size_t salen)
158 {
159 memcpy(&xprt->xpt_local, sa, salen);
160 xprt->xpt_locallen = salen;
161 }
svc_xprt_set_remote(struct svc_xprt * xprt,const struct sockaddr * sa,const size_t salen)162 static inline void svc_xprt_set_remote(struct svc_xprt *xprt,
163 const struct sockaddr *sa,
164 const size_t salen)
165 {
166 memcpy(&xprt->xpt_remote, sa, salen);
167 xprt->xpt_remotelen = salen;
168 snprintf(xprt->xpt_remotebuf, sizeof(xprt->xpt_remotebuf) - 1,
169 "%pISpc", sa);
170 }
171
svc_addr_port(const struct sockaddr * sa)172 static inline unsigned short svc_addr_port(const struct sockaddr *sa)
173 {
174 const struct sockaddr_in *sin = (const struct sockaddr_in *)sa;
175 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)sa;
176
177 switch (sa->sa_family) {
178 case AF_INET:
179 return ntohs(sin->sin_port);
180 case AF_INET6:
181 return ntohs(sin6->sin6_port);
182 }
183
184 return 0;
185 }
186
svc_addr_len(const struct sockaddr * sa)187 static inline size_t svc_addr_len(const struct sockaddr *sa)
188 {
189 switch (sa->sa_family) {
190 case AF_INET:
191 return sizeof(struct sockaddr_in);
192 case AF_INET6:
193 return sizeof(struct sockaddr_in6);
194 }
195 BUG();
196 }
197
svc_xprt_local_port(const struct svc_xprt * xprt)198 static inline unsigned short svc_xprt_local_port(const struct svc_xprt *xprt)
199 {
200 return svc_addr_port((const struct sockaddr *)&xprt->xpt_local);
201 }
202
svc_xprt_remote_port(const struct svc_xprt * xprt)203 static inline unsigned short svc_xprt_remote_port(const struct svc_xprt *xprt)
204 {
205 return svc_addr_port((const struct sockaddr *)&xprt->xpt_remote);
206 }
207
__svc_print_addr(const struct sockaddr * addr,char * buf,const size_t len)208 static inline char *__svc_print_addr(const struct sockaddr *addr,
209 char *buf, const size_t len)
210 {
211 const struct sockaddr_in *sin = (const struct sockaddr_in *)addr;
212 const struct sockaddr_in6 *sin6 = (const struct sockaddr_in6 *)addr;
213
214 switch (addr->sa_family) {
215 case AF_INET:
216 snprintf(buf, len, "%pI4, port=%u", &sin->sin_addr,
217 ntohs(sin->sin_port));
218 break;
219
220 case AF_INET6:
221 snprintf(buf, len, "%pI6, port=%u",
222 &sin6->sin6_addr,
223 ntohs(sin6->sin6_port));
224 break;
225
226 default:
227 snprintf(buf, len, "unknown address type: %d", addr->sa_family);
228 break;
229 }
230
231 return buf;
232 }
233 #endif /* SUNRPC_SVC_XPRT_H */
234