1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _LINUX_RSTREASON_H
#define _LINUX_RSTREASON_H
#include <net/dropreason-core.h>
#include <uapi/linux/mptcp.h>
#define DEFINE_RST_REASON(FN, FNe) \
FN(NOT_SPECIFIED) \
FN(NO_SOCKET) \
FN(TCP_INVALID_ACK_SEQUENCE) \
FN(TCP_RFC7323_PAWS) \
FN(TCP_TOO_OLD_ACK) \
FN(TCP_ACK_UNSENT_DATA) \
FN(TCP_FLAGS) \
FN(TCP_OLD_ACK) \
FN(TCP_ABORT_ON_DATA) \
FN(TCP_TIMEWAIT_SOCKET) \
FN(INVALID_SYN) \
FN(TCP_ABORT_ON_CLOSE) \
FN(TCP_ABORT_ON_LINGER) \
FN(TCP_ABORT_ON_MEMORY) \
FN(TCP_STATE) \
FN(TCP_KEEPALIVE_TIMEOUT) \
FN(TCP_DISCONNECT_WITH_DATA) \
FN(MPTCP_RST_EUNSPEC) \
FN(MPTCP_RST_EMPTCP) \
FN(MPTCP_RST_ERESOURCE) \
FN(MPTCP_RST_EPROHIBIT) \
FN(MPTCP_RST_EWQ2BIG) \
FN(MPTCP_RST_EBADPERF) \
FN(MPTCP_RST_EMIDDLEBOX) \
FN(ERROR) \
FNe(MAX)
/**
* enum sk_rst_reason - the reasons of socket reset
*
* The reasons of sk reset, which are used in DCCP/TCP/MPTCP protocols.
*
* There are three parts in order:
* 1) skb drop reasons: relying on drop reasons for such as passive reset
* 2) independent reset reasons: such as active reset reasons
* 3) reset reasons in MPTCP: only for MPTCP use
*/
enum sk_rst_reason {
/* Refer to include/net/dropreason-core.h
* Rely on skb drop reasons because it indicates exactly why RST
* could happen.
*/
/** @SK_RST_REASON_NOT_SPECIFIED: reset reason is not specified */
SK_RST_REASON_NOT_SPECIFIED,
/** @SK_RST_REASON_NO_SOCKET: no valid socket that can be used */
SK_RST_REASON_NO_SOCKET,
/**
* @SK_RST_REASON_TCP_INVALID_ACK_SEQUENCE: Not acceptable ACK SEQ
* field because ack sequence is not in the window between snd_una
* and snd_nxt
*/
SK_RST_REASON_TCP_INVALID_ACK_SEQUENCE,
/**
* @SK_RST_REASON_TCP_RFC7323_PAWS: PAWS check, corresponding to
* LINUX_MIB_PAWSESTABREJECTED, LINUX_MIB_PAWSACTIVEREJECTED
*/
SK_RST_REASON_TCP_RFC7323_PAWS,
/** @SK_RST_REASON_TCP_TOO_OLD_ACK: TCP ACK is too old */
SK_RST_REASON_TCP_TOO_OLD_ACK,
/**
* @SK_RST_REASON_TCP_ACK_UNSENT_DATA: TCP ACK for data we haven't
* sent yet
*/
SK_RST_REASON_TCP_ACK_UNSENT_DATA,
/** @SK_RST_REASON_TCP_FLAGS: TCP flags invalid */
SK_RST_REASON_TCP_FLAGS,
/** @SK_RST_REASON_TCP_OLD_ACK: TCP ACK is old, but in window */
SK_RST_REASON_TCP_OLD_ACK,
/**
* @SK_RST_REASON_TCP_ABORT_ON_DATA: abort on data
* corresponding to LINUX_MIB_TCPABORTONDATA
*/
SK_RST_REASON_TCP_ABORT_ON_DATA,
/* Here start with the independent reasons */
/** @SK_RST_REASON_TCP_TIMEWAIT_SOCKET: happen on the timewait socket */
SK_RST_REASON_TCP_TIMEWAIT_SOCKET,
/**
* @SK_RST_REASON_INVALID_SYN: receive bad syn packet
* RFC 793 says if the state is not CLOSED/LISTEN/SYN-SENT then
* "fourth, check the SYN bit,...If the SYN is in the window it is
* an error, send a reset"
*/
SK_RST_REASON_INVALID_SYN,
/**
* @SK_RST_REASON_TCP_ABORT_ON_CLOSE: abort on close
* corresponding to LINUX_MIB_TCPABORTONCLOSE
*/
SK_RST_REASON_TCP_ABORT_ON_CLOSE,
/**
* @SK_RST_REASON_TCP_ABORT_ON_LINGER: abort on linger
* corresponding to LINUX_MIB_TCPABORTONLINGER
*/
SK_RST_REASON_TCP_ABORT_ON_LINGER,
/**
* @SK_RST_REASON_TCP_ABORT_ON_MEMORY: abort on memory
* corresponding to LINUX_MIB_TCPABORTONMEMORY
*/
SK_RST_REASON_TCP_ABORT_ON_MEMORY,
/**
* @SK_RST_REASON_TCP_STATE: abort on tcp state
* Please see RFC 9293 for all possible reset conditions
*/
SK_RST_REASON_TCP_STATE,
/**
* @SK_RST_REASON_TCP_KEEPALIVE_TIMEOUT: time to timeout
* When we have already run out of all the chances, which means
* keepalive timeout, we have to reset the connection
*/
SK_RST_REASON_TCP_KEEPALIVE_TIMEOUT,
/**
* @SK_RST_REASON_TCP_DISCONNECT_WITH_DATA: disconnect when write
* queue is not empty
* It means user has written data into the write queue when doing
* disconnecting, so we have to send an RST.
*/
SK_RST_REASON_TCP_DISCONNECT_WITH_DATA,
/* Copy from include/uapi/linux/mptcp.h.
* These reset fields will not be changed since they adhere to
* RFC 8684. So do not touch them. I'm going to list each definition
* of them respectively.
*/
/**
* @SK_RST_REASON_MPTCP_RST_EUNSPEC: Unspecified error.
* This is the default error; it implies that the subflow is no
* longer available. The presence of this option shows that the
* RST was generated by an MPTCP-aware device.
*/
SK_RST_REASON_MPTCP_RST_EUNSPEC,
/**
* @SK_RST_REASON_MPTCP_RST_EMPTCP: MPTCP-specific error.
* An error has been detected in the processing of MPTCP options.
* This is the usual reason code to return in the cases where a RST
* is being sent to close a subflow because of an invalid response.
*/
SK_RST_REASON_MPTCP_RST_EMPTCP,
/**
* @SK_RST_REASON_MPTCP_RST_ERESOURCE: Lack of resources.
* This code indicates that the sending host does not have enough
* resources to support the terminated subflow.
*/
SK_RST_REASON_MPTCP_RST_ERESOURCE,
/**
* @SK_RST_REASON_MPTCP_RST_EPROHIBIT: Administratively prohibited.
* This code indicates that the requested subflow is prohibited by
* the policies of the sending host.
*/
SK_RST_REASON_MPTCP_RST_EPROHIBIT,
/**
* @SK_RST_REASON_MPTCP_RST_EWQ2BIG: Too much outstanding data.
* This code indicates that there is an excessive amount of data
* that needs to be transmitted over the terminated subflow while
* having already been acknowledged over one or more other subflows.
* This may occur if a path has been unavailable for a short period
* and it is more efficient to reset and start again than it is to
* retransmit the queued data.
*/
SK_RST_REASON_MPTCP_RST_EWQ2BIG,
/**
* @SK_RST_REASON_MPTCP_RST_EBADPERF: Unacceptable performance.
* This code indicates that the performance of this subflow was
* too low compared to the other subflows of this Multipath TCP
* connection.
*/
SK_RST_REASON_MPTCP_RST_EBADPERF,
/**
* @SK_RST_REASON_MPTCP_RST_EMIDDLEBOX: Middlebox interference.
* Middlebox interference has been detected over this subflow,
* making MPTCP signaling invalid. For example, this may be sent
* if the checksum does not validate.
*/
SK_RST_REASON_MPTCP_RST_EMIDDLEBOX,
/** @SK_RST_REASON_ERROR: unexpected error happens */
SK_RST_REASON_ERROR,
/**
* @SK_RST_REASON_MAX: Maximum of socket reset reasons.
* It shouldn't be used as a real 'reason'.
*/
SK_RST_REASON_MAX,
};
/* Convert skb drop reasons to enum sk_rst_reason type */
static inline enum sk_rst_reason
sk_rst_convert_drop_reason(enum skb_drop_reason reason)
{
switch (reason) {
case SKB_DROP_REASON_NOT_SPECIFIED:
return SK_RST_REASON_NOT_SPECIFIED;
case SKB_DROP_REASON_NO_SOCKET:
return SK_RST_REASON_NO_SOCKET;
case SKB_DROP_REASON_TCP_INVALID_ACK_SEQUENCE:
return SK_RST_REASON_TCP_INVALID_ACK_SEQUENCE;
case SKB_DROP_REASON_TCP_RFC7323_PAWS:
return SK_RST_REASON_TCP_RFC7323_PAWS;
case SKB_DROP_REASON_TCP_TOO_OLD_ACK:
return SK_RST_REASON_TCP_TOO_OLD_ACK;
case SKB_DROP_REASON_TCP_ACK_UNSENT_DATA:
return SK_RST_REASON_TCP_ACK_UNSENT_DATA;
case SKB_DROP_REASON_TCP_FLAGS:
return SK_RST_REASON_TCP_FLAGS;
case SKB_DROP_REASON_TCP_OLD_ACK:
return SK_RST_REASON_TCP_OLD_ACK;
case SKB_DROP_REASON_TCP_ABORT_ON_DATA:
return SK_RST_REASON_TCP_ABORT_ON_DATA;
default:
/* If we don't have our own corresponding reason */
return SK_RST_REASON_NOT_SPECIFIED;
}
}
#endif
|
