1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /* SCTP kernel implementation
3  * (C) Copyright IBM Corp. 2001, 2004
4  * Copyright (c) 1999-2000 Cisco, Inc.
5  * Copyright (c) 1999-2001 Motorola, Inc.
6  * Copyright (c) 2001 Intel Corp.
7  * Copyright (c) 2001 Nokia, Inc.
8  * Copyright (c) 2001 La Monte H.P. Yarroll
9  *
10  * These are the definitions needed for the sctp_ulpevent type.  The
11  * sctp_ulpevent type is used to carry information from the state machine
12  * upwards to the ULP.
13  *
14  * This file is part of the SCTP kernel implementation
15  *
16  * Please send any bug reports or fixes you make to the
17  * email address(es):
18  *    lksctp developers <linux-sctp@vger.kernel.org>
19  *
20  * Written or modified by:
21  *   Jon Grimm             <jgrimm@us.ibm.com>
22  *   La Monte H.P. Yarroll <piggy@acm.org>
23  *   Karl Knutson          <karl@athena.chicago.il.us>
24  *   Sridhar Samudrala     <sri@us.ibm.com>
25  */
26 
27 #ifndef __sctp_ulpevent_h__
28 #define __sctp_ulpevent_h__
29 
30 /* A structure to carry information to the ULP (e.g. Sockets API) */
31 /* Warning: This sits inside an skb.cb[] area.  Be very careful of
32  * growing this structure as it is at the maximum limit now.
33  *
34  * sctp_ulpevent is saved in sk->cb(48 bytes), whose last 4 bytes
35  * have been taken by sock_skb_cb, So here it has to use 'packed'
36  * to make sctp_ulpevent fit into the rest 44 bytes.
37  */
38 struct sctp_ulpevent {
39 	struct sctp_association *asoc;
40 	struct sctp_chunk *chunk;
41 	unsigned int rmem_len;
42 	union {
43 		__u32 mid;
44 		__u16 ssn;
45 	};
46 	union {
47 		__u32 ppid;
48 		__u32 fsn;
49 	};
50 	__u32 tsn;
51 	__u32 cumtsn;
52 	__u16 stream;
53 	__u16 flags;
54 	__u16 msg_flags;
55 } __packed;
56 
57 /* Retrieve the skb this event sits inside of. */
sctp_event2skb(const struct sctp_ulpevent * ev)58 static inline struct sk_buff *sctp_event2skb(const struct sctp_ulpevent *ev)
59 {
60 	return container_of((void *)ev, struct sk_buff, cb);
61 }
62 
63 /* Retrieve & cast the event sitting inside the skb. */
sctp_skb2event(struct sk_buff * skb)64 static inline struct sctp_ulpevent *sctp_skb2event(struct sk_buff *skb)
65 {
66 	return (struct sctp_ulpevent *)skb->cb;
67 }
68 
69 void sctp_ulpevent_free(struct sctp_ulpevent *);
70 int sctp_ulpevent_is_notification(const struct sctp_ulpevent *);
71 unsigned int sctp_queue_purge_ulpevents(struct sk_buff_head *list);
72 
73 struct sctp_ulpevent *sctp_ulpevent_make_assoc_change(
74 	const struct sctp_association *asoc,
75 	__u16 flags,
76 	__u16 state,
77 	__u16 error,
78 	__u16 outbound,
79 	__u16 inbound,
80 	struct sctp_chunk *chunk,
81 	gfp_t gfp);
82 
83 void sctp_ulpevent_notify_peer_addr_change(struct sctp_transport *transport,
84 					   int state, int error);
85 
86 struct sctp_ulpevent *sctp_ulpevent_make_remote_error(
87 	const struct sctp_association *asoc,
88 	struct sctp_chunk *chunk,
89 	__u16 flags,
90 	gfp_t gfp);
91 struct sctp_ulpevent *sctp_ulpevent_make_send_failed(
92 	const struct sctp_association *asoc,
93 	struct sctp_chunk *chunk,
94 	__u16 flags,
95 	__u32 error,
96 	gfp_t gfp);
97 
98 struct sctp_ulpevent *sctp_ulpevent_make_send_failed_event(
99 	const struct sctp_association *asoc,
100 	struct sctp_chunk *chunk,
101 	__u16 flags,
102 	__u32 error,
103 	gfp_t gfp);
104 
105 struct sctp_ulpevent *sctp_ulpevent_make_shutdown_event(
106 	const struct sctp_association *asoc,
107 	__u16 flags,
108 	gfp_t gfp);
109 
110 struct sctp_ulpevent *sctp_ulpevent_make_pdapi(
111 	const struct sctp_association *asoc,
112 	__u32 indication, __u32 sid, __u32 seq,
113 	__u32 flags, gfp_t gfp);
114 
115 struct sctp_ulpevent *sctp_ulpevent_make_adaptation_indication(
116 	const struct sctp_association *asoc, gfp_t gfp);
117 
118 struct sctp_ulpevent *sctp_ulpevent_make_rcvmsg(struct sctp_association *asoc,
119 	struct sctp_chunk *chunk,
120 	gfp_t gfp);
121 
122 struct sctp_ulpevent *sctp_ulpevent_make_authkey(
123 	const struct sctp_association *asoc, __u16 key_id,
124 	__u32 indication, gfp_t gfp);
125 
126 struct sctp_ulpevent *sctp_ulpevent_make_sender_dry_event(
127 	const struct sctp_association *asoc, gfp_t gfp);
128 
129 struct sctp_ulpevent *sctp_ulpevent_make_stream_reset_event(
130 	const struct sctp_association *asoc, __u16 flags,
131 	__u16 stream_num, __be16 *stream_list, gfp_t gfp);
132 
133 struct sctp_ulpevent *sctp_ulpevent_make_assoc_reset_event(
134 	const struct sctp_association *asoc, __u16 flags,
135 	 __u32 local_tsn, __u32 remote_tsn, gfp_t gfp);
136 
137 struct sctp_ulpevent *sctp_ulpevent_make_stream_change_event(
138 	const struct sctp_association *asoc, __u16 flags,
139 	__u32 strchange_instrms, __u32 strchange_outstrms, gfp_t gfp);
140 
141 struct sctp_ulpevent *sctp_make_reassembled_event(
142 	struct net *net, struct sk_buff_head *queue,
143 	struct sk_buff *f_frag, struct sk_buff *l_frag);
144 
145 void sctp_ulpevent_read_sndrcvinfo(const struct sctp_ulpevent *event,
146 				   struct msghdr *);
147 void sctp_ulpevent_read_rcvinfo(const struct sctp_ulpevent *event,
148 				struct msghdr *);
149 void sctp_ulpevent_read_nxtinfo(const struct sctp_ulpevent *event,
150 				struct msghdr *, struct sock *sk);
151 
152 __u16 sctp_ulpevent_get_notification_type(const struct sctp_ulpevent *event);
153 
sctp_ulpevent_type_set(__u16 * subscribe,__u16 sn_type,__u8 on)154 static inline void sctp_ulpevent_type_set(__u16 *subscribe,
155 					  __u16 sn_type, __u8 on)
156 {
157 	if (sn_type > SCTP_SN_TYPE_MAX)
158 		return;
159 
160 	if (on)
161 		*subscribe |=  (1 << (sn_type - SCTP_SN_TYPE_BASE));
162 	else
163 		*subscribe &= ~(1 << (sn_type - SCTP_SN_TYPE_BASE));
164 }
165 
166 /* Is this event type enabled? */
sctp_ulpevent_type_enabled(__u16 subscribe,__u16 sn_type)167 static inline bool sctp_ulpevent_type_enabled(__u16 subscribe, __u16 sn_type)
168 {
169 	if (sn_type > SCTP_SN_TYPE_MAX)
170 		return false;
171 
172 	return subscribe & (1 << (sn_type - SCTP_SN_TYPE_BASE));
173 }
174 
175 /* Given an event subscription, is this event enabled? */
sctp_ulpevent_is_enabled(const struct sctp_ulpevent * event,__u16 subscribe)176 static inline bool sctp_ulpevent_is_enabled(const struct sctp_ulpevent *event,
177 					    __u16 subscribe)
178 {
179 	__u16 sn_type;
180 
181 	if (!sctp_ulpevent_is_notification(event))
182 		return true;
183 
184 	sn_type = sctp_ulpevent_get_notification_type(event);
185 
186 	return sctp_ulpevent_type_enabled(subscribe, sn_type);
187 }
188 
189 #endif /* __sctp_ulpevent_h__ */
190