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1.1 root 1: /*
2: * network filesystem protocol
3: *
4: * messages are character arrays,
5: * encoding structures of characters,
6: * two-byte shorts, and four-byte longs.
7: * shorts and longs have a specific byte order,
8: * and should be accessed through the macros below.
9: */
10:
11: /*
12: * general numbers
13: */
14: #define NETB 2 /* protocol version */
15: #define NBMAXMSG (5*1024) /* max message size */
16: #define NBROOTTAG 0 /* i_tag assumed for the root */
17:
18:
19: /*
20: * turn network numbers into host numbers
21: * unsigned char *p
22: */
23: #define frnetlong(p, off) (p[off+0]+(p[off+1]<<8)+((long)p[off+2]<<16)+((long)p[off+3]<<24))
24: #define frnetshort(p, off) (p[off+0]+(p[off+1]<<8))
25: #define frnetchar(p, off) p[off]
26:
27: /*
28: * turn host numbers to network numbers
29: */
30:
31: #define tonetlong(p, off, l) (p[off+0]=(l), p[off+1]=(l)>>8, p[off+2]=(l)>>16, p[off+3]=(l)>>24)
32: #define tonetshort(p, off, s) (p[off+0]=(s), p[off+1]=(s)>>8)
33: #define tonetchar(p, off, c) (p[off]=c)
34:
35: /*
36: * messages from client to server
37: */
38:
39: /*
40: * general header
41: */
42:
43: #define SNB_VERSION 0 /* (char) version */
44: #define SNB_CMD 1 /* (char) command; see below */
45: #define SNB_FLAGS 2 /* (char) mostly for nami */
46: /* one byte of padding */
47: #define SNB_TRANNUM 4 /* (long) unique transaction ID */
48: #define SNB_LEN 8 /* (long) including header and any data */
49: #define SNB_TAG 12 /* (long) which file this is about */
50: #define SNB_UID 16 /* (short) who wants to do IO */
51: #define SNB_GID 18 /* (short) ditto */
52: /* four more bytes of junk */
53: #define SNBSIZE 24
54:
55: /*
56: * commands
57: */
58: #define NBPUT 1 /* put file */
59: /* 2 was NAGET */
60: #define NBUPD 3 /* update attributes */
61: #define NBREAD 4 /* read data */
62: #define NBWRT 5 /* write data */
63: #define NBNAMI 6 /* translate name (with many side effects) */
64: #define NBSTAT 7 /* read file status */
65: #define NBIOCTL 8 /* ioctl */
66: #define NBTRNC 9 /* truncate */
67: #define NBDIR 10 /* directory read */
68:
69: /*
70: * flags, for namei sub-function code,
71: * are defined in inode.h
72: * should they be here too?
73: */
74:
75: /*
76: * additional data for each command
77: */
78:
79: /*
80: * update
81: */
82: #define SUP_MODE (SNBSIZE+0) /* (short) new mode */
83: /* two bytes for raw device (mknod) */
84: /* four bytes of junk */
85: #define SUP_ATIME (SNBSIZE+8) /* (long) access time */
86: #define SUP_MTIME (SNBSIZE+12) /* (long) mod time */
87: #define SUPSIZE (SNBSIZE+16)
88:
89: /*
90: * read, dirread
91: */
92: #define SRD_LEN (SNBSIZE+0) /* (long) how much to read */
93: #define SRD_OFFSET (SNBSIZE+4) /* (long) file offset */
94: #define SRDSIZE (SNBSIZE+8)
95:
96: /*
97: * write
98: */
99: #define SWR_LEN (SNBSIZE+0) /* (long) how much to write */
100: #define SWR_OFFSET (SNBSIZE+4) /* (long) where to write it */
101: #define SWRSIZE (SNBSIZE+8)
102: /* data to be written follows immediately */
103:
104: /*
105: * namei
106: */
107: #define SNM_MODE (SNBSIZE+0) /* (short) mode for creat */
108: #define SNM_DEV (SNBSIZE+2) /* (short) device (mknod); used? */
109: #define SNM_INO (SNBSIZE+4) /* (long) i-number, for link */
110: #define SNMSIZE (SNBSIZE+8)
111: /* name to be translated follows immediately */
112:
113: /*
114: * SNB_FLAGS: namei function codes
115: * these must match the numbers in inode.h;
116: * they are repeated here so the protocol
117: * is all defined in one place
118: */
119: #define NI_SEARCH 0 /* search only (0 value known to nilargnamei, beware) */
120: #define NI_DEL 1 /* unlink this file */
121: #define NI_CREAT 2 /* create it if it doesn't exits */
122: #define NI_NXCREAT 3 /* create it, error if it already exists */
123: #define NI_LINK 4 /* make a link */
124: #define NI_MKDIR 5 /* make a directory */
125: #define NI_RMDIR 6 /* remove a directory */
126:
127: /*
128: * stat
129: */
130: #define SST_TIME (SNBSIZE+0) /* (long) time, for synchronization */
131: /* four bytes of padding */
132: #define SSTSIZE (SNBSIZE+8)
133:
134: /*
135: * ioctl
136: */
137: #define SIO_CMD (SNBSIZE+0) /* (long) function code */
138: #define SIO_FLAG (SNBSIZE+4) /* (short) file flags; silly? */
139: /* two bytes padding */
140: #define SIOSIZE (SNBSIZE+8)
141: #define SIODATA 64 /* bytes of data follow */
142: /* does some ioctl data follow? */
143:
144: /*
145: * responses from server to client
146: */
147:
148: /*
149: * general header
150: */
151: #define RNB_TRANNUM 0 /* (long) transaction ID */
152: #define RNB_ERRNO 4 /* (short) error number; zero if OK */
153: #define RNB_FLAGS 6 /* (char) see below */
154: /* one byte of pad */
155: #define RNB_LEN 8 /* (long) including header and any data */
156: #define RNB_FSIZE 12 /* (long) file size after write (why here?) */
157: #define RNBSIZE 16
158:
159: /*
160: * flags
161: */
162: #define NBROOT 1 /* namei popped out of root */
163: #define NBEND 2 /* last read was short, probably end of file */
164:
165: /*
166: * extra data for each type of response
167: */
168:
169: /*
170: * read: no extra header info;
171: * data follows at offset RNBSIZE
172: */
173:
174: /*
175: * namei
176: * contains an entire stat response
177: * so sys stat sends one namei message and no stat message
178: * not exactly a stat message, though: RNM_USED is in the middle
179: */
180:
181: #define RNM_TAG (RNBSIZE+0) /* (long) new file */
182: #define RNM_INO (RNBSIZE+4) /* (long) its i-number */
183: #define RNM_DEV (RNBSIZE+8) /* (short) st_dev */
184: #define RNM_MODE (RNBSIZE+10) /* (short) mode */
185: #define RNM_USED (RNBSIZE+12) /* (long) filename chars consumed (NBROOT only) */
186: #define RNM_NLINK (RNBSIZE+16) /* (short) */
187: #define RNM_UID (RNBSIZE+18) /* (short) */
188: #define RNM_GID (RNBSIZE+20) /* (short) */
189: #define RNM_RDEV (RNBSIZE+22) /* (short) st_rdev; useful? */
190: #define RNM_SIZE (RNBSIZE+24) /* (long) */
191: #define RNM_ATIME (RNBSIZE+28) /* (long) */
192: #define RNM_MTIME (RNBSIZE+32) /* (long) */
193: #define RNM_CTIME (RNBSIZE+36) /* (long) */
194: #define RNMSIZE (RNBSIZE+40)
195:
196: /*
197: * stat
198: */
199: #define RST_INO (RNBSIZE+0) /* (long) i-number */
200: #define RST_DEV (RNBSIZE+4) /* (short) st_dev */
201: #define RST_MODE (RNBSIZE+6) /* (short) */
202: #define RST_NLINK (RNBSIZE+8) /* (short) */
203: #define RST_UID (RNBSIZE+10) /* (short) */
204: #define RST_GID (RNBSIZE+12) /* (short) */
205: #define RST_RDEV (RNBSIZE+14) /* (short) st_rdev; used? */
206: #define RST_SIZE (RNBSIZE+16) /* (long) */
207: #define RST_ATIME (RNBSIZE+20) /* (long) */
208: #define RST_MTIME (RNBSIZE+24) /* (long) */
209: #define RST_CTIME (RNBSIZE+28) /* (long) */
210: #define RSTSIZE (RNBSIZE+32)
211:
212: /*
213: * ioctl:
214: * no header, just SIOSIZE bytes of ioctl data
215: */
216:
217: /*
218: * dirread
219: */
220: #define RDI_USED (RNBSIZE+0) /* (long) advance file pointer this much */
221: /* four bytes of junk */
222: #define RDISIZE (RNBSIZE+8)
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