Commit | Line | Data |
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1080ef75 SF |
1 | /* |
2 | * SMB2 version specific operations | |
3 | * | |
4 | * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com> | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License v2 as published | |
8 | * by the Free Software Foundation. | |
9 | * | |
10 | * This library is distributed in the hope that it will be useful, | |
11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
13 | * the GNU Lesser General Public License for more details. | |
14 | * | |
15 | * You should have received a copy of the GNU Lesser General Public License | |
16 | * along with this library; if not, write to the Free Software | |
17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
19 | ||
20 | #include "cifsglob.h" | |
2dc7e1c0 PS |
21 | #include "smb2pdu.h" |
22 | #include "smb2proto.h" | |
28ea5290 PS |
23 | #include "cifsproto.h" |
24 | #include "cifs_debug.h" | |
25 | ||
26 | static int | |
27 | change_conf(struct TCP_Server_Info *server) | |
28 | { | |
29 | server->credits += server->echo_credits + server->oplock_credits; | |
30 | server->oplock_credits = server->echo_credits = 0; | |
31 | switch (server->credits) { | |
32 | case 0: | |
33 | return -1; | |
34 | case 1: | |
35 | server->echoes = false; | |
36 | server->oplocks = false; | |
37 | cERROR(1, "disabling echoes and oplocks"); | |
38 | break; | |
39 | case 2: | |
40 | server->echoes = true; | |
41 | server->oplocks = false; | |
42 | server->echo_credits = 1; | |
43 | cFYI(1, "disabling oplocks"); | |
44 | break; | |
45 | default: | |
46 | server->echoes = true; | |
47 | server->oplocks = true; | |
48 | server->echo_credits = 1; | |
49 | server->oplock_credits = 1; | |
50 | } | |
51 | server->credits -= server->echo_credits + server->oplock_credits; | |
52 | return 0; | |
53 | } | |
54 | ||
55 | static void | |
56 | smb2_add_credits(struct TCP_Server_Info *server, const unsigned int add, | |
57 | const int optype) | |
58 | { | |
59 | int *val, rc = 0; | |
60 | spin_lock(&server->req_lock); | |
61 | val = server->ops->get_credits_field(server, optype); | |
62 | *val += add; | |
63 | server->in_flight--; | |
ec2e4523 | 64 | if (server->in_flight == 0 && (optype & CIFS_OP_MASK) != CIFS_NEG_OP) |
28ea5290 PS |
65 | rc = change_conf(server); |
66 | spin_unlock(&server->req_lock); | |
67 | wake_up(&server->request_q); | |
68 | if (rc) | |
69 | cifs_reconnect(server); | |
70 | } | |
71 | ||
72 | static void | |
73 | smb2_set_credits(struct TCP_Server_Info *server, const int val) | |
74 | { | |
75 | spin_lock(&server->req_lock); | |
76 | server->credits = val; | |
77 | spin_unlock(&server->req_lock); | |
78 | } | |
79 | ||
80 | static int * | |
81 | smb2_get_credits_field(struct TCP_Server_Info *server, const int optype) | |
82 | { | |
83 | switch (optype) { | |
84 | case CIFS_ECHO_OP: | |
85 | return &server->echo_credits; | |
86 | case CIFS_OBREAK_OP: | |
87 | return &server->oplock_credits; | |
88 | default: | |
89 | return &server->credits; | |
90 | } | |
91 | } | |
92 | ||
93 | static unsigned int | |
94 | smb2_get_credits(struct mid_q_entry *mid) | |
95 | { | |
96 | return le16_to_cpu(((struct smb2_hdr *)mid->resp_buf)->CreditRequest); | |
97 | } | |
2dc7e1c0 PS |
98 | |
99 | static __u64 | |
100 | smb2_get_next_mid(struct TCP_Server_Info *server) | |
101 | { | |
102 | __u64 mid; | |
103 | /* for SMB2 we need the current value */ | |
104 | spin_lock(&GlobalMid_Lock); | |
105 | mid = server->CurrentMid++; | |
106 | spin_unlock(&GlobalMid_Lock); | |
107 | return mid; | |
108 | } | |
1080ef75 | 109 | |
093b2bda PS |
110 | static struct mid_q_entry * |
111 | smb2_find_mid(struct TCP_Server_Info *server, char *buf) | |
112 | { | |
113 | struct mid_q_entry *mid; | |
114 | struct smb2_hdr *hdr = (struct smb2_hdr *)buf; | |
115 | ||
116 | spin_lock(&GlobalMid_Lock); | |
117 | list_for_each_entry(mid, &server->pending_mid_q, qhead) { | |
118 | if ((mid->mid == hdr->MessageId) && | |
119 | (mid->mid_state == MID_REQUEST_SUBMITTED) && | |
120 | (mid->command == hdr->Command)) { | |
121 | spin_unlock(&GlobalMid_Lock); | |
122 | return mid; | |
123 | } | |
124 | } | |
125 | spin_unlock(&GlobalMid_Lock); | |
126 | return NULL; | |
127 | } | |
128 | ||
129 | static void | |
130 | smb2_dump_detail(void *buf) | |
131 | { | |
132 | #ifdef CONFIG_CIFS_DEBUG2 | |
133 | struct smb2_hdr *smb = (struct smb2_hdr *)buf; | |
134 | ||
135 | cERROR(1, "Cmd: %d Err: 0x%x Flags: 0x%x Mid: %llu Pid: %d", | |
136 | smb->Command, smb->Status, smb->Flags, smb->MessageId, | |
137 | smb->ProcessId); | |
138 | cERROR(1, "smb buf %p len %u", smb, smb2_calc_size(smb)); | |
139 | #endif | |
140 | } | |
141 | ||
ec2e4523 PS |
142 | static bool |
143 | smb2_need_neg(struct TCP_Server_Info *server) | |
144 | { | |
145 | return server->max_read == 0; | |
146 | } | |
147 | ||
148 | static int | |
149 | smb2_negotiate(const unsigned int xid, struct cifs_ses *ses) | |
150 | { | |
151 | int rc; | |
152 | ses->server->CurrentMid = 0; | |
153 | rc = SMB2_negotiate(xid, ses); | |
154 | /* BB we probably don't need to retry with modern servers */ | |
155 | if (rc == -EAGAIN) | |
156 | rc = -EHOSTDOWN; | |
157 | return rc; | |
158 | } | |
159 | ||
1080ef75 | 160 | struct smb_version_operations smb21_operations = { |
2dc7e1c0 PS |
161 | .setup_request = smb2_setup_request, |
162 | .check_receive = smb2_check_receive, | |
28ea5290 PS |
163 | .add_credits = smb2_add_credits, |
164 | .set_credits = smb2_set_credits, | |
165 | .get_credits_field = smb2_get_credits_field, | |
166 | .get_credits = smb2_get_credits, | |
2dc7e1c0 | 167 | .get_next_mid = smb2_get_next_mid, |
093b2bda PS |
168 | .find_mid = smb2_find_mid, |
169 | .check_message = smb2_check_message, | |
170 | .dump_detail = smb2_dump_detail, | |
ec2e4523 PS |
171 | .need_neg = smb2_need_neg, |
172 | .negotiate = smb2_negotiate, | |
5478f9ba PS |
173 | .sess_setup = SMB2_sess_setup, |
174 | .logoff = SMB2_logoff, | |
faaf946a PS |
175 | .tree_connect = SMB2_tcon, |
176 | .tree_disconnect = SMB2_tdis, | |
1080ef75 SF |
177 | }; |
178 | ||
179 | struct smb_version_values smb21_values = { | |
180 | .version_string = SMB21_VERSION_STRING, | |
093b2bda PS |
181 | .header_size = sizeof(struct smb2_hdr), |
182 | .max_header_size = MAX_SMB2_HDR_SIZE, | |
2dc7e1c0 | 183 | .lock_cmd = SMB2_LOCK, |
1080ef75 | 184 | }; |