1 056fe1ba 2003-11-23 devnull #include <u.h>
  2 056fe1ba 2003-11-23 devnull #include <libc.h>
  3 056fe1ba 2003-11-23 devnull #include <venti.h>
  4 056fe1ba 2003-11-23 devnull #include <libsec.h>
  5 056fe1ba 2003-11-23 devnull 
  6 056fe1ba 2003-11-23 devnull typedef struct Mem Mem;
  7 056fe1ba 2003-11-23 devnull typedef struct Frag Frag;
  8 056fe1ba 2003-11-23 devnull 
  9 056fe1ba 2003-11-23 devnull enum {
 10 056fe1ba 2003-11-23 devnull 	BigMemSize = MaxFragSize,
 11 056fe1ba 2003-11-23 devnull 	SmallMemSize = BigMemSize/8,
 12 056fe1ba 2003-11-23 devnull 	NLocalFrag = 2,
 13 056fe1ba 2003-11-23 devnull };
 14 056fe1ba 2003-11-23 devnull 
 15 056fe1ba 2003-11-23 devnull /* position to carve out of a Mem */
 16 056fe1ba 2003-11-23 devnull enum {
 17 056fe1ba 2003-11-23 devnull 	PFront,
 18 056fe1ba 2003-11-23 devnull 	PMiddle,
 19 056fe1ba 2003-11-23 devnull 	PEnd,
 20 056fe1ba 2003-11-23 devnull };
 21 056fe1ba 2003-11-23 devnull 
 22 056fe1ba 2003-11-23 devnull struct Mem
 23 056fe1ba 2003-11-23 devnull {
 24 056fe1ba 2003-11-23 devnull 	Lock lk;
 25 056fe1ba 2003-11-23 devnull 	int ref;
 26 056fe1ba 2003-11-23 devnull 	uchar *bp;
 27 056fe1ba 2003-11-23 devnull 	uchar *ep;
 28 056fe1ba 2003-11-23 devnull 	uchar *rp;
 29 056fe1ba 2003-11-23 devnull 	uchar *wp;
 30 056fe1ba 2003-11-23 devnull 	Mem *next;
 31 056fe1ba 2003-11-23 devnull };
 32 056fe1ba 2003-11-23 devnull 
 33 056fe1ba 2003-11-23 devnull enum {
 34 056fe1ba 2003-11-23 devnull 	FragLocalFree,
 35 056fe1ba 2003-11-23 devnull 	FragLocalAlloc,
 36 056fe1ba 2003-11-23 devnull 	FragGlobal,
 37 056fe1ba 2003-11-23 devnull };
 38 056fe1ba 2003-11-23 devnull 	
 39 056fe1ba 2003-11-23 devnull struct Frag
 40 056fe1ba 2003-11-23 devnull {
 41 056fe1ba 2003-11-23 devnull 	int state;
 42 056fe1ba 2003-11-23 devnull 	Mem *mem;
 43 056fe1ba 2003-11-23 devnull 	uchar *rp;
 44 056fe1ba 2003-11-23 devnull 	uchar *wp;
 45 056fe1ba 2003-11-23 devnull 	Frag *next;
 46 056fe1ba 2003-11-23 devnull 	void (*free)(void*);
 47 056fe1ba 2003-11-23 devnull 	void *a;
 48 056fe1ba 2003-11-23 devnull };
 49 056fe1ba 2003-11-23 devnull 
 50 056fe1ba 2003-11-23 devnull struct Packet
 51 056fe1ba 2003-11-23 devnull {
 52 056fe1ba 2003-11-23 devnull 	int size;
 53 056fe1ba 2003-11-23 devnull 	int asize;  /* allocated memory - greater than size unless foreign frags */
 54 056fe1ba 2003-11-23 devnull 	
 55 056fe1ba 2003-11-23 devnull 	Packet *next;
 56 056fe1ba 2003-11-23 devnull 	
 57 056fe1ba 2003-11-23 devnull 	Frag *first;
 58 056fe1ba 2003-11-23 devnull 	Frag *last;
 59 056fe1ba 2003-11-23 devnull 	
 60 056fe1ba 2003-11-23 devnull 	Frag local[NLocalFrag];
 61 056fe1ba 2003-11-23 devnull };
 62 056fe1ba 2003-11-23 devnull 
 63 056fe1ba 2003-11-23 devnull static Frag *fragalloc(Packet*, int n, int pos, Frag *next);
 64 056fe1ba 2003-11-23 devnull static Frag *fragdup(Packet*, Frag*);
 65 056fe1ba 2003-11-23 devnull static void fragfree(Frag*);
 66 056fe1ba 2003-11-23 devnull 
 67 056fe1ba 2003-11-23 devnull static Mem *memalloc(int, int);
 68 056fe1ba 2003-11-23 devnull static void memfree(Mem*);
 69 056fe1ba 2003-11-23 devnull static int memhead(Mem *m, uchar *rp, int n);
 70 056fe1ba 2003-11-23 devnull static int memtail(Mem *m, uchar *wp, int n);
 71 056fe1ba 2003-11-23 devnull 
 72 056fe1ba 2003-11-23 devnull static char EPacketSize[] = "bad packet size";
 73 056fe1ba 2003-11-23 devnull static char EPacketOffset[] = "bad packet offset";
 74 056fe1ba 2003-11-23 devnull static char EBadSize[] = "bad size";
 75 056fe1ba 2003-11-23 devnull 
 76 056fe1ba 2003-11-23 devnull static struct {
 77 056fe1ba 2003-11-23 devnull 	Lock lk;
 78 056fe1ba 2003-11-23 devnull 	Packet *packet;
 79 056fe1ba 2003-11-23 devnull 	int npacket;
 80 056fe1ba 2003-11-23 devnull 	Frag *frag;
 81 056fe1ba 2003-11-23 devnull 	int nfrag;
 82 056fe1ba 2003-11-23 devnull 	Mem *bigmem;
 83 056fe1ba 2003-11-23 devnull 	int nbigmem;
 84 056fe1ba 2003-11-23 devnull 	Mem *smallmem;
 85 056fe1ba 2003-11-23 devnull 	int nsmallmem;
 86 056fe1ba 2003-11-23 devnull } freelist;
 87 056fe1ba 2003-11-23 devnull 
 88 056fe1ba 2003-11-23 devnull #define FRAGSIZE(f) ((f)->wp - (f)->rp)
 89 056fe1ba 2003-11-23 devnull #define FRAGASIZE(f) ((f)->mem ? (f)->mem->ep - (f)->mem->bp : 0)
 90 056fe1ba 2003-11-23 devnull 
 91 056fe1ba 2003-11-23 devnull #define NOTFREE(p) assert((p)->size>=0)
 92 056fe1ba 2003-11-23 devnull 
 93 056fe1ba 2003-11-23 devnull Packet *
 94 056fe1ba 2003-11-23 devnull packetalloc(void)
 95 056fe1ba 2003-11-23 devnull {
 96 056fe1ba 2003-11-23 devnull 	Packet *p;
 97 056fe1ba 2003-11-23 devnull 
 98 056fe1ba 2003-11-23 devnull 	lock(&freelist.lk);
 99 056fe1ba 2003-11-23 devnull 	p = freelist.packet;
100 056fe1ba 2003-11-23 devnull 	if(p != nil)
101 056fe1ba 2003-11-23 devnull 		freelist.packet = p->next;
102 056fe1ba 2003-11-23 devnull 	else
103 056fe1ba 2003-11-23 devnull 		freelist.npacket++;
104 056fe1ba 2003-11-23 devnull 	unlock(&freelist.lk);
105 056fe1ba 2003-11-23 devnull 
106 056fe1ba 2003-11-23 devnull 	if(p == nil)
107 056fe1ba 2003-11-23 devnull 		p = vtbrk(sizeof(Packet));
108 056fe1ba 2003-11-23 devnull 	else
109 056fe1ba 2003-11-23 devnull 		assert(p->size == -1);
110 056fe1ba 2003-11-23 devnull 	p->size = 0;
111 056fe1ba 2003-11-23 devnull 	p->asize = 0;
112 056fe1ba 2003-11-23 devnull 	p->first = nil;
113 056fe1ba 2003-11-23 devnull 	p->last = nil;
114 056fe1ba 2003-11-23 devnull 	p->next = nil;
115 056fe1ba 2003-11-23 devnull 
116 d23a617a 2004-03-15 devnull if(0)fprint(2, "packetalloc %p from %08lux %08lux %08lux\n", p, *((uint*)&p+2), *((uint*)&p+3), *((uint*)&p+4));
117 056fe1ba 2003-11-23 devnull 
118 056fe1ba 2003-11-23 devnull 	return p;
119 056fe1ba 2003-11-23 devnull }
120 056fe1ba 2003-11-23 devnull 
121 056fe1ba 2003-11-23 devnull void
122 056fe1ba 2003-11-23 devnull packetfree(Packet *p)
123 056fe1ba 2003-11-23 devnull {
124 056fe1ba 2003-11-23 devnull 	Frag *f, *ff;
125 056fe1ba 2003-11-23 devnull 
126 d23a617a 2004-03-15 devnull if(0)fprint(2, "packetfree %p from %08lux\n", p, getcallerpc(&p));
127 056fe1ba 2003-11-23 devnull 
128 056fe1ba 2003-11-23 devnull 	if(p == nil)
129 056fe1ba 2003-11-23 devnull 		return;
130 056fe1ba 2003-11-23 devnull 
131 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
132 056fe1ba 2003-11-23 devnull 	p->size = -1;
133 056fe1ba 2003-11-23 devnull 
134 056fe1ba 2003-11-23 devnull 	for(f=p->first; f!=nil; f=ff) {
135 056fe1ba 2003-11-23 devnull 		ff = f->next;
136 056fe1ba 2003-11-23 devnull 		fragfree(f);
137 056fe1ba 2003-11-23 devnull 	}
138 056fe1ba 2003-11-23 devnull 	p->first = nil;
139 056fe1ba 2003-11-23 devnull 	p->last = nil;
140 056fe1ba 2003-11-23 devnull 
141 056fe1ba 2003-11-23 devnull 	lock(&freelist.lk);
142 056fe1ba 2003-11-23 devnull 	p->next = freelist.packet;
143 056fe1ba 2003-11-23 devnull 	freelist.packet = p;
144 056fe1ba 2003-11-23 devnull 	unlock(&freelist.lk);
145 056fe1ba 2003-11-23 devnull }
146 056fe1ba 2003-11-23 devnull 
147 056fe1ba 2003-11-23 devnull Packet *
148 056fe1ba 2003-11-23 devnull packetdup(Packet *p, int offset, int n)
149 056fe1ba 2003-11-23 devnull {	
150 056fe1ba 2003-11-23 devnull 	Frag *f, *ff;
151 056fe1ba 2003-11-23 devnull 	Packet *pp;
152 056fe1ba 2003-11-23 devnull 
153 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
154 056fe1ba 2003-11-23 devnull 	if(offset < 0 || n < 0 || offset+n > p->size) {
155 056fe1ba 2003-11-23 devnull 		werrstr(EBadSize);
156 056fe1ba 2003-11-23 devnull 		return nil;
157 056fe1ba 2003-11-23 devnull 	}
158 056fe1ba 2003-11-23 devnull 
159 056fe1ba 2003-11-23 devnull 	pp = packetalloc();
160 056fe1ba 2003-11-23 devnull 	if(n == 0)
161 056fe1ba 2003-11-23 devnull 		return pp;
162 056fe1ba 2003-11-23 devnull 
163 056fe1ba 2003-11-23 devnull 	pp->size = n;
164 056fe1ba 2003-11-23 devnull 
165 056fe1ba 2003-11-23 devnull 	/* skip offset */
166 056fe1ba 2003-11-23 devnull 	for(f=p->first; offset >= FRAGSIZE(f); f=f->next)
167 056fe1ba 2003-11-23 devnull 		offset -= FRAGSIZE(f);
168 056fe1ba 2003-11-23 devnull 	
169 056fe1ba 2003-11-23 devnull 	/* first frag */
170 056fe1ba 2003-11-23 devnull 	ff = fragdup(pp, f);
171 056fe1ba 2003-11-23 devnull 	ff->rp += offset;
172 056fe1ba 2003-11-23 devnull 	pp->first = ff;
173 056fe1ba 2003-11-23 devnull 	n -= FRAGSIZE(ff);
174 056fe1ba 2003-11-23 devnull 	pp->asize += FRAGASIZE(ff);
175 056fe1ba 2003-11-23 devnull 
176 056fe1ba 2003-11-23 devnull 	/* the remaining */
177 056fe1ba 2003-11-23 devnull 	while(n > 0) {
178 056fe1ba 2003-11-23 devnull 		f = f->next;
179 056fe1ba 2003-11-23 devnull 		ff->next = fragdup(pp, f);
180 056fe1ba 2003-11-23 devnull 		ff = ff->next;
181 056fe1ba 2003-11-23 devnull 		n -= FRAGSIZE(ff);
182 056fe1ba 2003-11-23 devnull 		pp->asize += FRAGASIZE(ff);
183 056fe1ba 2003-11-23 devnull 	}
184 056fe1ba 2003-11-23 devnull 	
185 056fe1ba 2003-11-23 devnull 	/* fix up last frag: note n <= 0 */
186 056fe1ba 2003-11-23 devnull 	ff->wp += n;
187 056fe1ba 2003-11-23 devnull 	ff->next = nil;
188 056fe1ba 2003-11-23 devnull 	pp->last = ff;
189 056fe1ba 2003-11-23 devnull 
190 056fe1ba 2003-11-23 devnull 	return pp;
191 056fe1ba 2003-11-23 devnull }
192 056fe1ba 2003-11-23 devnull 
193 056fe1ba 2003-11-23 devnull Packet *
194 056fe1ba 2003-11-23 devnull packetsplit(Packet *p, int n)
195 056fe1ba 2003-11-23 devnull {
196 056fe1ba 2003-11-23 devnull 	Packet *pp;
197 056fe1ba 2003-11-23 devnull 	Frag *f, *ff;
198 056fe1ba 2003-11-23 devnull 
199 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
200 056fe1ba 2003-11-23 devnull 	if(n < 0 || n > p->size) {
201 056fe1ba 2003-11-23 devnull 		werrstr(EPacketSize);
202 056fe1ba 2003-11-23 devnull 		return nil;
203 056fe1ba 2003-11-23 devnull 	}
204 056fe1ba 2003-11-23 devnull 
205 056fe1ba 2003-11-23 devnull 	pp = packetalloc();
206 056fe1ba 2003-11-23 devnull 	if(n == 0)
207 056fe1ba 2003-11-23 devnull 		return pp;
208 056fe1ba 2003-11-23 devnull 
209 056fe1ba 2003-11-23 devnull 	pp->size = n;
210 056fe1ba 2003-11-23 devnull 	p->size -= n;
211 056fe1ba 2003-11-23 devnull 	ff = nil;
212 056fe1ba 2003-11-23 devnull 	for(f=p->first; n > 0 && n >= FRAGSIZE(f); f=f->next) {
213 056fe1ba 2003-11-23 devnull 		n -= FRAGSIZE(f);
214 056fe1ba 2003-11-23 devnull 		p->asize -= FRAGASIZE(f);
215 056fe1ba 2003-11-23 devnull 		pp->asize += FRAGASIZE(f);
216 056fe1ba 2003-11-23 devnull 		ff = f;
217 056fe1ba 2003-11-23 devnull 	}
218 056fe1ba 2003-11-23 devnull 
219 056fe1ba 2003-11-23 devnull 	/* split shared frag */
220 056fe1ba 2003-11-23 devnull 	if(n > 0) {
221 056fe1ba 2003-11-23 devnull 		ff = f;
222 056fe1ba 2003-11-23 devnull 		f = fragdup(pp, ff);
223 056fe1ba 2003-11-23 devnull 		pp->asize += FRAGASIZE(ff);
224 056fe1ba 2003-11-23 devnull 		ff->next = nil;
225 056fe1ba 2003-11-23 devnull 		ff->wp = ff->rp + n;
226 056fe1ba 2003-11-23 devnull 		f->rp += n;
227 056fe1ba 2003-11-23 devnull 	}
228 056fe1ba 2003-11-23 devnull 
229 056fe1ba 2003-11-23 devnull 	pp->first = p->first;
230 056fe1ba 2003-11-23 devnull 	pp->last = ff;
231 056fe1ba 2003-11-23 devnull 	p->first = f;
232 056fe1ba 2003-11-23 devnull 	return pp;
233 056fe1ba 2003-11-23 devnull }
234 056fe1ba 2003-11-23 devnull 
235 056fe1ba 2003-11-23 devnull int
236 056fe1ba 2003-11-23 devnull packetconsume(Packet *p, uchar *buf, int n)
237 056fe1ba 2003-11-23 devnull {
238 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
239 056fe1ba 2003-11-23 devnull 	if(buf && packetcopy(p, buf, 0, n) < 0)
240 d23a617a 2004-03-15 devnull 		return -1;
241 056fe1ba 2003-11-23 devnull 	return packettrim(p, n, p->size-n);
242 056fe1ba 2003-11-23 devnull }
243 056fe1ba 2003-11-23 devnull 
244 056fe1ba 2003-11-23 devnull int
245 056fe1ba 2003-11-23 devnull packettrim(Packet *p, int offset, int n)
246 056fe1ba 2003-11-23 devnull {
247 056fe1ba 2003-11-23 devnull 	Frag *f, *ff;
248 056fe1ba 2003-11-23 devnull 
249 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
250 056fe1ba 2003-11-23 devnull 	if(offset < 0 || offset > p->size) {
251 056fe1ba 2003-11-23 devnull 		werrstr(EPacketOffset);
252 056fe1ba 2003-11-23 devnull 		return -1;
253 056fe1ba 2003-11-23 devnull 	}
254 056fe1ba 2003-11-23 devnull 
255 056fe1ba 2003-11-23 devnull 	if(n < 0 || offset + n > p->size) {
256 056fe1ba 2003-11-23 devnull 		werrstr(EPacketOffset);
257 056fe1ba 2003-11-23 devnull 		return -1;
258 056fe1ba 2003-11-23 devnull 	}
259 056fe1ba 2003-11-23 devnull 
260 056fe1ba 2003-11-23 devnull 	p->size = n;
261 056fe1ba 2003-11-23 devnull 
262 056fe1ba 2003-11-23 devnull 	/* easy case */
263 056fe1ba 2003-11-23 devnull 	if(n == 0) {
264 056fe1ba 2003-11-23 devnull 		for(f=p->first; f != nil; f=ff) {
265 056fe1ba 2003-11-23 devnull 			ff = f->next;
266 056fe1ba 2003-11-23 devnull 			fragfree(f);
267 056fe1ba 2003-11-23 devnull 		}
268 056fe1ba 2003-11-23 devnull 		p->first = p->last = nil;
269 056fe1ba 2003-11-23 devnull 		p->asize = 0;
270 056fe1ba 2003-11-23 devnull 		return 0;
271 056fe1ba 2003-11-23 devnull 	}
272 056fe1ba 2003-11-23 devnull 	
273 056fe1ba 2003-11-23 devnull 	/* free before offset */
274 056fe1ba 2003-11-23 devnull 	for(f=p->first; offset >= FRAGSIZE(f); f=ff) {
275 056fe1ba 2003-11-23 devnull 		p->asize -= FRAGASIZE(f);
276 056fe1ba 2003-11-23 devnull 		offset -= FRAGSIZE(f);
277 056fe1ba 2003-11-23 devnull 		ff = f->next;
278 056fe1ba 2003-11-23 devnull 		fragfree(f);
279 056fe1ba 2003-11-23 devnull 	}
280 056fe1ba 2003-11-23 devnull 
281 056fe1ba 2003-11-23 devnull 	/* adjust frag */
282 056fe1ba 2003-11-23 devnull 	f->rp += offset;
283 056fe1ba 2003-11-23 devnull 	p->first = f;
284 056fe1ba 2003-11-23 devnull 
285 056fe1ba 2003-11-23 devnull 	/* skip middle */
286 056fe1ba 2003-11-23 devnull 	for(; n > 0 && n > FRAGSIZE(f); f=f->next)
287 056fe1ba 2003-11-23 devnull 		n -= FRAGSIZE(f);
288 056fe1ba 2003-11-23 devnull 
289 056fe1ba 2003-11-23 devnull 	/* adjust end */
290 056fe1ba 2003-11-23 devnull 	f->wp = f->rp + n;
291 056fe1ba 2003-11-23 devnull 	p->last = f;
292 056fe1ba 2003-11-23 devnull 	ff = f->next;
293 056fe1ba 2003-11-23 devnull 	f->next = nil;
294 056fe1ba 2003-11-23 devnull 
295 056fe1ba 2003-11-23 devnull 	/* free after */
296 056fe1ba 2003-11-23 devnull 	for(f=ff; f != nil; f=ff) {
297 056fe1ba 2003-11-23 devnull 		p->asize -= FRAGASIZE(f);
298 056fe1ba 2003-11-23 devnull 		ff = f->next;
299 056fe1ba 2003-11-23 devnull 		fragfree(f);
300 056fe1ba 2003-11-23 devnull 	}
301 056fe1ba 2003-11-23 devnull 	return 0;
302 056fe1ba 2003-11-23 devnull }
303 056fe1ba 2003-11-23 devnull 
304 056fe1ba 2003-11-23 devnull uchar *
305 056fe1ba 2003-11-23 devnull packetheader(Packet *p, int n)
306 056fe1ba 2003-11-23 devnull {
307 056fe1ba 2003-11-23 devnull 	Frag *f;
308 056fe1ba 2003-11-23 devnull 	Mem *m;
309 056fe1ba 2003-11-23 devnull 
310 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
311 056fe1ba 2003-11-23 devnull 	if(n <= 0 || n > MaxFragSize) {
312 056fe1ba 2003-11-23 devnull 		werrstr(EPacketSize);
313 056fe1ba 2003-11-23 devnull 		return nil;
314 056fe1ba 2003-11-23 devnull 	}
315 056fe1ba 2003-11-23 devnull 
316 056fe1ba 2003-11-23 devnull 	p->size += n;
317 056fe1ba 2003-11-23 devnull 	
318 056fe1ba 2003-11-23 devnull 	/* try and fix in current frag */
319 056fe1ba 2003-11-23 devnull 	f = p->first;
320 056fe1ba 2003-11-23 devnull 	if(f != nil) {
321 056fe1ba 2003-11-23 devnull 		m = f->mem;
322 056fe1ba 2003-11-23 devnull 		if(n <= f->rp - m->bp)
323 056fe1ba 2003-11-23 devnull 		if(m->ref == 1 || memhead(m, f->rp, n) >= 0) {
324 056fe1ba 2003-11-23 devnull 			f->rp -= n;
325 056fe1ba 2003-11-23 devnull 			return f->rp;
326 056fe1ba 2003-11-23 devnull 		}
327 056fe1ba 2003-11-23 devnull 	}
328 056fe1ba 2003-11-23 devnull 
329 056fe1ba 2003-11-23 devnull 	/* add frag to front */
330 056fe1ba 2003-11-23 devnull 	f = fragalloc(p, n, PEnd, p->first);
331 056fe1ba 2003-11-23 devnull 	p->asize += FRAGASIZE(f);
332 056fe1ba 2003-11-23 devnull 	if(p->first == nil)
333 056fe1ba 2003-11-23 devnull 		p->last = f;
334 056fe1ba 2003-11-23 devnull 	p->first = f;
335 056fe1ba 2003-11-23 devnull 	return f->rp;
336 056fe1ba 2003-11-23 devnull }
337 056fe1ba 2003-11-23 devnull 
338 056fe1ba 2003-11-23 devnull uchar *
339 056fe1ba 2003-11-23 devnull packettrailer(Packet *p, int n)
340 056fe1ba 2003-11-23 devnull {
341 056fe1ba 2003-11-23 devnull 	Mem *m;
342 056fe1ba 2003-11-23 devnull 	Frag *f;
343 056fe1ba 2003-11-23 devnull 
344 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
345 056fe1ba 2003-11-23 devnull 	if(n <= 0 || n > MaxFragSize) {
346 056fe1ba 2003-11-23 devnull 		werrstr(EPacketSize);
347 056fe1ba 2003-11-23 devnull 		return nil;
348 056fe1ba 2003-11-23 devnull 	}
349 056fe1ba 2003-11-23 devnull 
350 056fe1ba 2003-11-23 devnull 	p->size += n;
351 056fe1ba 2003-11-23 devnull 	
352 056fe1ba 2003-11-23 devnull 	/* try and fix in current frag */
353 056fe1ba 2003-11-23 devnull 	if(p->first != nil) {
354 056fe1ba 2003-11-23 devnull 		f = p->last;
355 056fe1ba 2003-11-23 devnull 		m = f->mem;
356 056fe1ba 2003-11-23 devnull 		if(n <= m->ep - f->wp)
357 056fe1ba 2003-11-23 devnull 		if(m->ref == 1 || memtail(m, f->wp, n) >= 0) {
358 056fe1ba 2003-11-23 devnull 			f->wp += n;
359 056fe1ba 2003-11-23 devnull 			return f->wp - n;
360 056fe1ba 2003-11-23 devnull 		}
361 056fe1ba 2003-11-23 devnull 	}
362 056fe1ba 2003-11-23 devnull 
363 056fe1ba 2003-11-23 devnull 	/* add frag to end */
364 056fe1ba 2003-11-23 devnull 	f = fragalloc(p, n, (p->first == nil)?PMiddle:PFront, nil);
365 056fe1ba 2003-11-23 devnull 	p->asize += FRAGASIZE(f);
366 056fe1ba 2003-11-23 devnull 	if(p->first == nil)
367 056fe1ba 2003-11-23 devnull 		p->first = f;
368 056fe1ba 2003-11-23 devnull 	else
369 056fe1ba 2003-11-23 devnull 		p->last->next = f;
370 056fe1ba 2003-11-23 devnull 	p->last = f;
371 056fe1ba 2003-11-23 devnull 	return f->rp;
372 056fe1ba 2003-11-23 devnull }
373 056fe1ba 2003-11-23 devnull 
374 d23a617a 2004-03-15 devnull void
375 056fe1ba 2003-11-23 devnull packetprefix(Packet *p, uchar *buf, int n)
376 056fe1ba 2003-11-23 devnull {
377 056fe1ba 2003-11-23 devnull 	Frag *f;
378 056fe1ba 2003-11-23 devnull 	int nn;
379 056fe1ba 2003-11-23 devnull 	Mem *m;
380 056fe1ba 2003-11-23 devnull 
381 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
382 056fe1ba 2003-11-23 devnull 	if(n <= 0)
383 d23a617a 2004-03-15 devnull 		return;
384 056fe1ba 2003-11-23 devnull 
385 056fe1ba 2003-11-23 devnull 	p->size += n;
386 056fe1ba 2003-11-23 devnull 
387 056fe1ba 2003-11-23 devnull 	/* try and fix in current frag */
388 056fe1ba 2003-11-23 devnull 	f = p->first;
389 056fe1ba 2003-11-23 devnull 	if(f != nil) {
390 056fe1ba 2003-11-23 devnull 		m = f->mem;
391 056fe1ba 2003-11-23 devnull 		nn = f->rp - m->bp;
392 056fe1ba 2003-11-23 devnull 		if(nn > n)
393 056fe1ba 2003-11-23 devnull 			nn = n;
394 056fe1ba 2003-11-23 devnull 		if(m->ref == 1 || memhead(m, f->rp, nn) >= 0) {
395 056fe1ba 2003-11-23 devnull 			f->rp -= nn;
396 056fe1ba 2003-11-23 devnull 			n -= nn;
397 056fe1ba 2003-11-23 devnull 			memmove(f->rp, buf+n, nn);
398 056fe1ba 2003-11-23 devnull 		}
399 056fe1ba 2003-11-23 devnull 	}
400 056fe1ba 2003-11-23 devnull 
401 056fe1ba 2003-11-23 devnull 	while(n > 0) {
402 056fe1ba 2003-11-23 devnull 		nn = n;
403 056fe1ba 2003-11-23 devnull 		if(nn > MaxFragSize)
404 056fe1ba 2003-11-23 devnull 			nn = MaxFragSize;
405 056fe1ba 2003-11-23 devnull 		f = fragalloc(p, nn, PEnd, p->first);	
406 056fe1ba 2003-11-23 devnull 		p->asize += FRAGASIZE(f);
407 056fe1ba 2003-11-23 devnull 		if(p->first == nil)
408 056fe1ba 2003-11-23 devnull 			p->last = f;
409 056fe1ba 2003-11-23 devnull 		p->first = f;
410 056fe1ba 2003-11-23 devnull 		n -= nn;
411 056fe1ba 2003-11-23 devnull 		memmove(f->rp, buf+n, nn);
412 056fe1ba 2003-11-23 devnull 	}
413 056fe1ba 2003-11-23 devnull }
414 056fe1ba 2003-11-23 devnull 
415 d23a617a 2004-03-15 devnull void
416 056fe1ba 2003-11-23 devnull packetappend(Packet *p, uchar *buf, int n)
417 056fe1ba 2003-11-23 devnull {
418 056fe1ba 2003-11-23 devnull 	Frag *f;
419 056fe1ba 2003-11-23 devnull 	int nn;
420 056fe1ba 2003-11-23 devnull 	Mem *m;
421 056fe1ba 2003-11-23 devnull 
422 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
423 056fe1ba 2003-11-23 devnull 	if(n <= 0)
424 d23a617a 2004-03-15 devnull 		return;
425 056fe1ba 2003-11-23 devnull 
426 056fe1ba 2003-11-23 devnull 	p->size += n;
427 056fe1ba 2003-11-23 devnull 	/* try and fix in current frag */
428 056fe1ba 2003-11-23 devnull 	if(p->first != nil) {
429 056fe1ba 2003-11-23 devnull 		f = p->last;
430 056fe1ba 2003-11-23 devnull 		m = f->mem;
431 056fe1ba 2003-11-23 devnull 		nn = m->ep - f->wp;
432 056fe1ba 2003-11-23 devnull 		if(nn > n)
433 056fe1ba 2003-11-23 devnull 			nn = n;
434 056fe1ba 2003-11-23 devnull 		if(m->ref == 1 || memtail(m, f->wp, nn) >= 0) {
435 056fe1ba 2003-11-23 devnull 			memmove(f->wp, buf, nn);
436 056fe1ba 2003-11-23 devnull 			f->wp += nn;
437 056fe1ba 2003-11-23 devnull 			buf += nn;
438 056fe1ba 2003-11-23 devnull 			n -= nn;
439 056fe1ba 2003-11-23 devnull 		}
440 056fe1ba 2003-11-23 devnull 	}
441 056fe1ba 2003-11-23 devnull 	
442 056fe1ba 2003-11-23 devnull 	while(n > 0) {
443 056fe1ba 2003-11-23 devnull 		nn = n;
444 056fe1ba 2003-11-23 devnull 		if(nn > MaxFragSize)
445 056fe1ba 2003-11-23 devnull 			nn = MaxFragSize;
446 056fe1ba 2003-11-23 devnull 		f = fragalloc(p, nn, (p->first == nil)?PMiddle:PFront, nil);
447 056fe1ba 2003-11-23 devnull 		p->asize += FRAGASIZE(f);
448 056fe1ba 2003-11-23 devnull 		if(p->first == nil)
449 056fe1ba 2003-11-23 devnull 			p->first = f;
450 056fe1ba 2003-11-23 devnull 		else
451 056fe1ba 2003-11-23 devnull 			p->last->next = f;
452 056fe1ba 2003-11-23 devnull 		p->last = f;
453 056fe1ba 2003-11-23 devnull 		memmove(f->rp, buf, nn);
454 056fe1ba 2003-11-23 devnull 		buf += nn;
455 056fe1ba 2003-11-23 devnull 		n -= nn;
456 056fe1ba 2003-11-23 devnull 	}
457 d23a617a 2004-03-15 devnull 	return;
458 056fe1ba 2003-11-23 devnull }
459 056fe1ba 2003-11-23 devnull 
460 d23a617a 2004-03-15 devnull void
461 056fe1ba 2003-11-23 devnull packetconcat(Packet *p, Packet *pp)
462 056fe1ba 2003-11-23 devnull {
463 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
464 056fe1ba 2003-11-23 devnull 	NOTFREE(pp);
465 056fe1ba 2003-11-23 devnull 	if(pp->size == 0)
466 d23a617a 2004-03-15 devnull 		return;
467 056fe1ba 2003-11-23 devnull 	p->size += pp->size;
468 056fe1ba 2003-11-23 devnull 	p->asize += pp->asize;
469 056fe1ba 2003-11-23 devnull 
470 056fe1ba 2003-11-23 devnull 	if(p->first != nil)
471 056fe1ba 2003-11-23 devnull 		p->last->next = pp->first;
472 056fe1ba 2003-11-23 devnull 	else
473 056fe1ba 2003-11-23 devnull 		p->first = pp->first;
474 056fe1ba 2003-11-23 devnull 	p->last = pp->last;
475 056fe1ba 2003-11-23 devnull 	pp->size = 0;
476 056fe1ba 2003-11-23 devnull 	pp->asize = 0;
477 056fe1ba 2003-11-23 devnull 	pp->first = nil;
478 056fe1ba 2003-11-23 devnull 	pp->last = nil;
479 056fe1ba 2003-11-23 devnull }
480 056fe1ba 2003-11-23 devnull 
481 056fe1ba 2003-11-23 devnull uchar *
482 056fe1ba 2003-11-23 devnull packetpeek(Packet *p, uchar *buf, int offset, int n)
483 056fe1ba 2003-11-23 devnull {
484 056fe1ba 2003-11-23 devnull 	Frag *f;
485 056fe1ba 2003-11-23 devnull 	int nn;
486 056fe1ba 2003-11-23 devnull 	uchar *b;
487 056fe1ba 2003-11-23 devnull 
488 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
489 056fe1ba 2003-11-23 devnull 	if(n == 0)
490 056fe1ba 2003-11-23 devnull 		return buf;
491 056fe1ba 2003-11-23 devnull 
492 056fe1ba 2003-11-23 devnull 	if(offset < 0 || offset >= p->size) {
493 056fe1ba 2003-11-23 devnull 		werrstr(EPacketOffset);
494 056fe1ba 2003-11-23 devnull 		return nil;
495 056fe1ba 2003-11-23 devnull 	}
496 056fe1ba 2003-11-23 devnull 
497 056fe1ba 2003-11-23 devnull 	if(n < 0 || offset + n > p->size) {
498 056fe1ba 2003-11-23 devnull 		werrstr(EPacketSize);
499 056fe1ba 2003-11-23 devnull 		return nil;
500 056fe1ba 2003-11-23 devnull 	}
501 056fe1ba 2003-11-23 devnull 	
502 056fe1ba 2003-11-23 devnull 	/* skip up to offset */
503 056fe1ba 2003-11-23 devnull 	for(f=p->first; offset >= FRAGSIZE(f); f=f->next)
504 056fe1ba 2003-11-23 devnull 		offset -= FRAGSIZE(f);
505 056fe1ba 2003-11-23 devnull 
506 056fe1ba 2003-11-23 devnull 	/* easy case */
507 056fe1ba 2003-11-23 devnull 	if(offset + n <= FRAGSIZE(f))
508 056fe1ba 2003-11-23 devnull 		return f->rp + offset;
509 056fe1ba 2003-11-23 devnull 
510 056fe1ba 2003-11-23 devnull 	for(b=buf; n>0; n -= nn) {
511 056fe1ba 2003-11-23 devnull 		nn = FRAGSIZE(f) - offset;
512 056fe1ba 2003-11-23 devnull 		if(nn > n)
513 056fe1ba 2003-11-23 devnull 			nn = n;
514 056fe1ba 2003-11-23 devnull 		memmove(b, f->rp+offset, nn);
515 056fe1ba 2003-11-23 devnull 		offset = 0;
516 056fe1ba 2003-11-23 devnull 		f = f->next;
517 056fe1ba 2003-11-23 devnull 		b += nn;
518 056fe1ba 2003-11-23 devnull 	}
519 056fe1ba 2003-11-23 devnull 
520 056fe1ba 2003-11-23 devnull 	return buf;
521 056fe1ba 2003-11-23 devnull }
522 056fe1ba 2003-11-23 devnull 
523 056fe1ba 2003-11-23 devnull int
524 056fe1ba 2003-11-23 devnull packetcopy(Packet *p, uchar *buf, int offset, int n)
525 056fe1ba 2003-11-23 devnull {
526 056fe1ba 2003-11-23 devnull 	uchar *b;
527 056fe1ba 2003-11-23 devnull 
528 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
529 056fe1ba 2003-11-23 devnull 	b = packetpeek(p, buf, offset, n);
530 056fe1ba 2003-11-23 devnull 	if(b == nil)
531 056fe1ba 2003-11-23 devnull 		return -1;
532 056fe1ba 2003-11-23 devnull 	if(b != buf)
533 056fe1ba 2003-11-23 devnull 		memmove(buf, b, n);
534 056fe1ba 2003-11-23 devnull 	return 0;
535 056fe1ba 2003-11-23 devnull }
536 056fe1ba 2003-11-23 devnull 
537 056fe1ba 2003-11-23 devnull int
538 056fe1ba 2003-11-23 devnull packetfragments(Packet *p, IOchunk *io, int nio, int offset)
539 056fe1ba 2003-11-23 devnull {
540 056fe1ba 2003-11-23 devnull 	Frag *f;
541 056fe1ba 2003-11-23 devnull 	int size;
542 056fe1ba 2003-11-23 devnull 	IOchunk *eio;
543 056fe1ba 2003-11-23 devnull 
544 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
545 056fe1ba 2003-11-23 devnull 	if(p->size == 0 || nio <= 0)
546 056fe1ba 2003-11-23 devnull 		return 0;
547 056fe1ba 2003-11-23 devnull 	
548 056fe1ba 2003-11-23 devnull 	if(offset < 0 || offset > p->size) {
549 056fe1ba 2003-11-23 devnull 		werrstr(EPacketOffset);
550 056fe1ba 2003-11-23 devnull 		return -1;
551 056fe1ba 2003-11-23 devnull 	}
552 056fe1ba 2003-11-23 devnull 
553 056fe1ba 2003-11-23 devnull 	for(f=p->first; offset >= FRAGSIZE(f); f=f->next)
554 056fe1ba 2003-11-23 devnull 		offset -= FRAGSIZE(f);
555 056fe1ba 2003-11-23 devnull 
556 056fe1ba 2003-11-23 devnull 	size = 0;
557 056fe1ba 2003-11-23 devnull 	eio = io + nio;
558 056fe1ba 2003-11-23 devnull 	for(; f != nil && io < eio; f=f->next) {
559 056fe1ba 2003-11-23 devnull 		io->addr = f->rp + offset;
560 056fe1ba 2003-11-23 devnull 		io->len = f->wp - (f->rp + offset);	
561 056fe1ba 2003-11-23 devnull 		offset = 0;
562 056fe1ba 2003-11-23 devnull 		size += io->len;
563 056fe1ba 2003-11-23 devnull 		io++;
564 056fe1ba 2003-11-23 devnull 	}
565 056fe1ba 2003-11-23 devnull 
566 056fe1ba 2003-11-23 devnull 	return size;
567 056fe1ba 2003-11-23 devnull }
568 056fe1ba 2003-11-23 devnull 
569 056fe1ba 2003-11-23 devnull void
570 056fe1ba 2003-11-23 devnull packetstats(void)
571 056fe1ba 2003-11-23 devnull {
572 056fe1ba 2003-11-23 devnull 	Packet *p;
573 056fe1ba 2003-11-23 devnull 	Frag *f;
574 056fe1ba 2003-11-23 devnull 	Mem *m;
575 056fe1ba 2003-11-23 devnull 
576 056fe1ba 2003-11-23 devnull 	int np, nf, nsm, nbm;
577 056fe1ba 2003-11-23 devnull 
578 056fe1ba 2003-11-23 devnull 	lock(&freelist.lk);
579 056fe1ba 2003-11-23 devnull 	np = 0;
580 056fe1ba 2003-11-23 devnull 	for(p=freelist.packet; p; p=p->next)
581 056fe1ba 2003-11-23 devnull 		np++;
582 056fe1ba 2003-11-23 devnull 	nf = 0;
583 056fe1ba 2003-11-23 devnull 	for(f=freelist.frag; f; f=f->next)
584 056fe1ba 2003-11-23 devnull 		nf++;
585 056fe1ba 2003-11-23 devnull 	nsm = 0;
586 056fe1ba 2003-11-23 devnull 	for(m=freelist.smallmem; m; m=m->next)
587 056fe1ba 2003-11-23 devnull 		nsm++;
588 056fe1ba 2003-11-23 devnull 	nbm = 0;
589 056fe1ba 2003-11-23 devnull 	for(m=freelist.bigmem; m; m=m->next)
590 056fe1ba 2003-11-23 devnull 		nbm++;
591 056fe1ba 2003-11-23 devnull 	
592 056fe1ba 2003-11-23 devnull 	fprint(2, "packet: %d/%d frag: %d/%d small mem: %d/%d big mem: %d/%d\n",
593 056fe1ba 2003-11-23 devnull 		np, freelist.npacket,
594 056fe1ba 2003-11-23 devnull 		nf, freelist.nfrag,
595 056fe1ba 2003-11-23 devnull 		nsm, freelist.nsmallmem,
596 056fe1ba 2003-11-23 devnull 		nbm, freelist.nbigmem);
597 056fe1ba 2003-11-23 devnull 
598 056fe1ba 2003-11-23 devnull 	unlock(&freelist.lk);
599 056fe1ba 2003-11-23 devnull }
600 056fe1ba 2003-11-23 devnull 
601 056fe1ba 2003-11-23 devnull 
602 056fe1ba 2003-11-23 devnull uint
603 056fe1ba 2003-11-23 devnull packetsize(Packet *p)
604 056fe1ba 2003-11-23 devnull {
605 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
606 056fe1ba 2003-11-23 devnull 	if(0) {
607 056fe1ba 2003-11-23 devnull 		Frag *f;
608 056fe1ba 2003-11-23 devnull 		int size = 0;
609 056fe1ba 2003-11-23 devnull 	
610 056fe1ba 2003-11-23 devnull 		for(f=p->first; f; f=f->next)
611 056fe1ba 2003-11-23 devnull 			size += FRAGSIZE(f);
612 056fe1ba 2003-11-23 devnull 		if(size != p->size)
613 056fe1ba 2003-11-23 devnull 			fprint(2, "packetsize %d %d\n", size, p->size);
614 056fe1ba 2003-11-23 devnull 		assert(size == p->size);
615 056fe1ba 2003-11-23 devnull 	}
616 056fe1ba 2003-11-23 devnull 	return p->size;
617 056fe1ba 2003-11-23 devnull }
618 056fe1ba 2003-11-23 devnull 
619 056fe1ba 2003-11-23 devnull uint
620 056fe1ba 2003-11-23 devnull packetasize(Packet *p)
621 056fe1ba 2003-11-23 devnull {
622 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
623 056fe1ba 2003-11-23 devnull 	if(0) {
624 056fe1ba 2003-11-23 devnull 		Frag *f;
625 056fe1ba 2003-11-23 devnull 		int asize = 0;
626 056fe1ba 2003-11-23 devnull 	
627 056fe1ba 2003-11-23 devnull 		for(f=p->first; f; f=f->next)
628 056fe1ba 2003-11-23 devnull 			asize += FRAGASIZE(f);
629 056fe1ba 2003-11-23 devnull 		if(asize != p->asize)
630 056fe1ba 2003-11-23 devnull 			fprint(2, "packetasize %d %d\n", asize, p->asize);
631 056fe1ba 2003-11-23 devnull 		assert(asize == p->asize);
632 056fe1ba 2003-11-23 devnull 	}
633 056fe1ba 2003-11-23 devnull 	return p->asize;
634 056fe1ba 2003-11-23 devnull }
635 056fe1ba 2003-11-23 devnull 
636 056fe1ba 2003-11-23 devnull void
637 056fe1ba 2003-11-23 devnull packetsha1(Packet *p, uchar digest[VtScoreSize])
638 056fe1ba 2003-11-23 devnull {
639 056fe1ba 2003-11-23 devnull 	DigestState ds;
640 056fe1ba 2003-11-23 devnull 	Frag *f;
641 056fe1ba 2003-11-23 devnull 	int size;
642 056fe1ba 2003-11-23 devnull 
643 056fe1ba 2003-11-23 devnull 	NOTFREE(p);
644 056fe1ba 2003-11-23 devnull 	memset(&ds, 0, sizeof ds);
645 056fe1ba 2003-11-23 devnull 	size = p->size;
646 056fe1ba 2003-11-23 devnull 	for(f=p->first; f; f=f->next) {
647 056fe1ba 2003-11-23 devnull 		sha1(f->rp, FRAGSIZE(f), nil, &ds);
648 056fe1ba 2003-11-23 devnull 		size -= FRAGSIZE(f);
649 056fe1ba 2003-11-23 devnull 	}
650 056fe1ba 2003-11-23 devnull 	assert(size == 0);
651 056fe1ba 2003-11-23 devnull 	sha1(nil, 0, digest, &ds);
652 056fe1ba 2003-11-23 devnull }
653 056fe1ba 2003-11-23 devnull 
654 056fe1ba 2003-11-23 devnull int
655 056fe1ba 2003-11-23 devnull packetcmp(Packet *pkt0, Packet *pkt1)
656 056fe1ba 2003-11-23 devnull {
657 056fe1ba 2003-11-23 devnull 	Frag *f0, *f1;
658 056fe1ba 2003-11-23 devnull 	int n0, n1, x;
659 056fe1ba 2003-11-23 devnull 
660 056fe1ba 2003-11-23 devnull 	NOTFREE(pkt0);
661 056fe1ba 2003-11-23 devnull 	NOTFREE(pkt1);
662 056fe1ba 2003-11-23 devnull 	f0 = pkt0->first;
663 056fe1ba 2003-11-23 devnull 	f1 = pkt1->first;
664 056fe1ba 2003-11-23 devnull 
665 056fe1ba 2003-11-23 devnull 	if(f0 == nil)
666 056fe1ba 2003-11-23 devnull 		return (f1 == nil)?0:-1;
667 056fe1ba 2003-11-23 devnull 	if(f1 == nil)
668 056fe1ba 2003-11-23 devnull 		return 1;
669 056fe1ba 2003-11-23 devnull 	n0 = FRAGSIZE(f0);
670 056fe1ba 2003-11-23 devnull 	n1 = FRAGSIZE(f1);
671 056fe1ba 2003-11-23 devnull 
672 056fe1ba 2003-11-23 devnull 	for(;;) {
673 056fe1ba 2003-11-23 devnull 		if(n0 < n1) {
674 056fe1ba 2003-11-23 devnull 			x = memcmp(f0->wp - n0, f1->wp - n1, n0);
675 056fe1ba 2003-11-23 devnull 			if(x != 0)
676 056fe1ba 2003-11-23 devnull 				return x;
677 056fe1ba 2003-11-23 devnull 			n1 -= n0;
678 056fe1ba 2003-11-23 devnull 			f0 = f0->next;
679 056fe1ba 2003-11-23 devnull 			if(f0 == nil)
680 056fe1ba 2003-11-23 devnull 				return -1;
681 056fe1ba 2003-11-23 devnull 			n0 = FRAGSIZE(f0);
682 056fe1ba 2003-11-23 devnull 		} else if (n0 > n1) {
683 056fe1ba 2003-11-23 devnull 			x = memcmp(f0->wp - n0, f1->wp - n1, n1);
684 056fe1ba 2003-11-23 devnull 			if(x != 0)
685 056fe1ba 2003-11-23 devnull 				return x;
686 056fe1ba 2003-11-23 devnull 			n0 -= n1;
687 056fe1ba 2003-11-23 devnull 			f1 = f1->next;
688 056fe1ba 2003-11-23 devnull 			if(f1 == nil)
689 056fe1ba 2003-11-23 devnull 				return 1;
690 056fe1ba 2003-11-23 devnull 			n1 = FRAGSIZE(f1);
691 056fe1ba 2003-11-23 devnull 		} else { /* n0 == n1 */
692 056fe1ba 2003-11-23 devnull 			x = memcmp(f0->wp - n0, f1->wp - n1, n0);
693 056fe1ba 2003-11-23 devnull 			if(x != 0)
694 056fe1ba 2003-11-23 devnull 				return x;
695 056fe1ba 2003-11-23 devnull 			f0 = f0->next;
696 056fe1ba 2003-11-23 devnull 			f1 = f1->next;
697 056fe1ba 2003-11-23 devnull 			if(f0 == nil)
698 056fe1ba 2003-11-23 devnull 				return (f1 == nil)?0:-1;
699 056fe1ba 2003-11-23 devnull 			if(f1 == nil)
700 056fe1ba 2003-11-23 devnull 				return 1;
701 056fe1ba 2003-11-23 devnull 			n0 = FRAGSIZE(f0);
702 056fe1ba 2003-11-23 devnull 			n1 = FRAGSIZE(f1);
703 056fe1ba 2003-11-23 devnull 		}
704 056fe1ba 2003-11-23 devnull 	}
705 056fe1ba 2003-11-23 devnull 	return 0; /* for ken */
706 056fe1ba 2003-11-23 devnull }
707 056fe1ba 2003-11-23 devnull 	
708 056fe1ba 2003-11-23 devnull 
709 056fe1ba 2003-11-23 devnull static Frag *
710 056fe1ba 2003-11-23 devnull fragalloc(Packet *p, int n, int pos, Frag *next)
711 056fe1ba 2003-11-23 devnull {
712 056fe1ba 2003-11-23 devnull 	Frag *f, *ef;
713 056fe1ba 2003-11-23 devnull 	Mem *m;
714 056fe1ba 2003-11-23 devnull 
715 056fe1ba 2003-11-23 devnull 	/* look for local frag */
716 056fe1ba 2003-11-23 devnull 	f = &p->local[0];
717 056fe1ba 2003-11-23 devnull 	ef = &p->local[NLocalFrag];
718 056fe1ba 2003-11-23 devnull 	for(;f<ef; f++) {
719 056fe1ba 2003-11-23 devnull 		if(f->state == FragLocalFree) {
720 056fe1ba 2003-11-23 devnull 			f->state = FragLocalAlloc;
721 056fe1ba 2003-11-23 devnull 			goto Found;
722 056fe1ba 2003-11-23 devnull 		}
723 056fe1ba 2003-11-23 devnull 	}
724 056fe1ba 2003-11-23 devnull 	lock(&freelist.lk);	
725 056fe1ba 2003-11-23 devnull 	f = freelist.frag;
726 056fe1ba 2003-11-23 devnull 	if(f != nil)
727 056fe1ba 2003-11-23 devnull 		freelist.frag = f->next;
728 056fe1ba 2003-11-23 devnull 	else
729 056fe1ba 2003-11-23 devnull 		freelist.nfrag++;
730 056fe1ba 2003-11-23 devnull 	unlock(&freelist.lk);
731 056fe1ba 2003-11-23 devnull 
732 056fe1ba 2003-11-23 devnull 	if(f == nil) {
733 056fe1ba 2003-11-23 devnull 		f = vtbrk(sizeof(Frag));
734 056fe1ba 2003-11-23 devnull 		f->state = FragGlobal;
735 056fe1ba 2003-11-23 devnull 	}
736 056fe1ba 2003-11-23 devnull 
737 056fe1ba 2003-11-23 devnull Found:
738 056fe1ba 2003-11-23 devnull 	f->next = next;
739 056fe1ba 2003-11-23 devnull 
740 056fe1ba 2003-11-23 devnull 	if(n == 0){
741 056fe1ba 2003-11-23 devnull 		f->mem = 0;
742 056fe1ba 2003-11-23 devnull 		f->rp = 0;
743 056fe1ba 2003-11-23 devnull 		f->wp = 0;
744 056fe1ba 2003-11-23 devnull 		return f;
745 056fe1ba 2003-11-23 devnull 	}
746 056fe1ba 2003-11-23 devnull 
747 056fe1ba 2003-11-23 devnull 	if(pos == PEnd && next == nil)
748 056fe1ba 2003-11-23 devnull 		pos = PMiddle;
749 056fe1ba 2003-11-23 devnull 	m = memalloc(n, pos);
750 056fe1ba 2003-11-23 devnull 	f->mem = m;
751 056fe1ba 2003-11-23 devnull 	f->rp = m->rp;
752 056fe1ba 2003-11-23 devnull 	f->wp = m->wp;
753 056fe1ba 2003-11-23 devnull 	return f;
754 056fe1ba 2003-11-23 devnull }
755 056fe1ba 2003-11-23 devnull 
756 056fe1ba 2003-11-23 devnull Packet*
757 056fe1ba 2003-11-23 devnull packetforeign(uchar *buf, int n, void (*free)(void *a), void *a)
758 056fe1ba 2003-11-23 devnull {
759 056fe1ba 2003-11-23 devnull 	Packet *p;
760 056fe1ba 2003-11-23 devnull 	Frag *f;
761 056fe1ba 2003-11-23 devnull 
762 056fe1ba 2003-11-23 devnull 	p = packetalloc();
763 056fe1ba 2003-11-23 devnull 	f = fragalloc(p, 0, 0, nil);
764 056fe1ba 2003-11-23 devnull 	f->free = free;
765 056fe1ba 2003-11-23 devnull 	f->a = a;
766 056fe1ba 2003-11-23 devnull 	f->next = nil;
767 056fe1ba 2003-11-23 devnull 	f->rp = buf;
768 056fe1ba 2003-11-23 devnull 	f->wp = buf+n;
769 056fe1ba 2003-11-23 devnull 
770 056fe1ba 2003-11-23 devnull 	p->first = f;
771 056fe1ba 2003-11-23 devnull 	p->size = n;
772 056fe1ba 2003-11-23 devnull 	return p;
773 056fe1ba 2003-11-23 devnull }
774 056fe1ba 2003-11-23 devnull 
775 056fe1ba 2003-11-23 devnull static Frag *
776 056fe1ba 2003-11-23 devnull fragdup(Packet *p, Frag *f)
777 056fe1ba 2003-11-23 devnull {
778 056fe1ba 2003-11-23 devnull 	Frag *ff;
779 056fe1ba 2003-11-23 devnull 	Mem *m;
780 056fe1ba 2003-11-23 devnull 
781 056fe1ba 2003-11-23 devnull 	m = f->mem;	
782 056fe1ba 2003-11-23 devnull 
783 056fe1ba 2003-11-23 devnull 	/*
784 056fe1ba 2003-11-23 devnull 	 * m->rp && m->wp can be out of date when ref == 1
785 056fe1ba 2003-11-23 devnull 	 * also, potentially reclaims space from previous frags
786 056fe1ba 2003-11-23 devnull 	 */
787 056fe1ba 2003-11-23 devnull 	if(m && m->ref == 1) {
788 056fe1ba 2003-11-23 devnull 		m->rp = f->rp;
789 056fe1ba 2003-11-23 devnull 		m->wp = f->wp;
790 056fe1ba 2003-11-23 devnull 	}
791 056fe1ba 2003-11-23 devnull 
792 056fe1ba 2003-11-23 devnull 	ff = fragalloc(p, 0, 0, nil);
793 056fe1ba 2003-11-23 devnull 	*ff = *f;
794 056fe1ba 2003-11-23 devnull 	if(m){
795 056fe1ba 2003-11-23 devnull 		lock(&m->lk);
796 056fe1ba 2003-11-23 devnull 		m->ref++;
797 056fe1ba 2003-11-23 devnull 		unlock(&m->lk);
798 056fe1ba 2003-11-23 devnull 	}
799 056fe1ba 2003-11-23 devnull 	return ff;
800 056fe1ba 2003-11-23 devnull }
801 056fe1ba 2003-11-23 devnull 
802 056fe1ba 2003-11-23 devnull 
803 056fe1ba 2003-11-23 devnull static void
804 056fe1ba 2003-11-23 devnull fragfree(Frag *f)
805 056fe1ba 2003-11-23 devnull {
806 056fe1ba 2003-11-23 devnull 	if(f->mem == nil){
807 056fe1ba 2003-11-23 devnull 		if(f->free)
808 056fe1ba 2003-11-23 devnull 			(*f->free)(f->a);
809 056fe1ba 2003-11-23 devnull 	}else{
810 056fe1ba 2003-11-23 devnull 		memfree(f->mem);
811 056fe1ba 2003-11-23 devnull 		f->mem = 0;
812 056fe1ba 2003-11-23 devnull 	}
813 056fe1ba 2003-11-23 devnull 
814 056fe1ba 2003-11-23 devnull 	if(f->state == FragLocalAlloc) {
815 056fe1ba 2003-11-23 devnull 		f->state = FragLocalFree;
816 056fe1ba 2003-11-23 devnull 		return;
817 056fe1ba 2003-11-23 devnull 	}
818 056fe1ba 2003-11-23 devnull 
819 056fe1ba 2003-11-23 devnull 	lock(&freelist.lk);
820 056fe1ba 2003-11-23 devnull 	f->next = freelist.frag;
821 056fe1ba 2003-11-23 devnull 	freelist.frag = f;
822 056fe1ba 2003-11-23 devnull 	unlock(&freelist.lk);	
823 056fe1ba 2003-11-23 devnull }
824 056fe1ba 2003-11-23 devnull 
825 056fe1ba 2003-11-23 devnull static Mem *
826 056fe1ba 2003-11-23 devnull memalloc(int n, int pos)
827 056fe1ba 2003-11-23 devnull {
828 056fe1ba 2003-11-23 devnull 	Mem *m;
829 056fe1ba 2003-11-23 devnull 	int nn;
830 056fe1ba 2003-11-23 devnull 
831 056fe1ba 2003-11-23 devnull 	if(n < 0 || n > MaxFragSize) {
832 056fe1ba 2003-11-23 devnull 		werrstr(EPacketSize);
833 056fe1ba 2003-11-23 devnull 		return 0;
834 056fe1ba 2003-11-23 devnull 	}
835 056fe1ba 2003-11-23 devnull 	if(n <= SmallMemSize) {
836 056fe1ba 2003-11-23 devnull 		lock(&freelist.lk);
837 056fe1ba 2003-11-23 devnull 		m = freelist.smallmem;
838 056fe1ba 2003-11-23 devnull 		if(m != nil)
839 056fe1ba 2003-11-23 devnull 			freelist.smallmem = m->next;
840 056fe1ba 2003-11-23 devnull 		else
841 056fe1ba 2003-11-23 devnull 			freelist.nsmallmem++;
842 056fe1ba 2003-11-23 devnull 		unlock(&freelist.lk);
843 056fe1ba 2003-11-23 devnull 		nn = SmallMemSize;
844 056fe1ba 2003-11-23 devnull 	} else {
845 056fe1ba 2003-11-23 devnull 		lock(&freelist.lk);
846 056fe1ba 2003-11-23 devnull 		m = freelist.bigmem;
847 056fe1ba 2003-11-23 devnull 		if(m != nil)
848 056fe1ba 2003-11-23 devnull 			freelist.bigmem = m->next;
849 056fe1ba 2003-11-23 devnull 		else
850 056fe1ba 2003-11-23 devnull 			freelist.nbigmem++;
851 056fe1ba 2003-11-23 devnull 		unlock(&freelist.lk);
852 056fe1ba 2003-11-23 devnull 		nn = BigMemSize;
853 056fe1ba 2003-11-23 devnull 	}
854 056fe1ba 2003-11-23 devnull 
855 056fe1ba 2003-11-23 devnull 	if(m == nil) {
856 056fe1ba 2003-11-23 devnull 		m = vtbrk(sizeof(Mem));
857 056fe1ba 2003-11-23 devnull 		m->bp = vtbrk(nn);
858 056fe1ba 2003-11-23 devnull 		m->ep = m->bp + nn;
859 056fe1ba 2003-11-23 devnull 	}
860 056fe1ba 2003-11-23 devnull 	assert(m->ref == 0);	
861 056fe1ba 2003-11-23 devnull 	m->ref = 1;
862 056fe1ba 2003-11-23 devnull 
863 056fe1ba 2003-11-23 devnull 	switch(pos) {
864 056fe1ba 2003-11-23 devnull 	default:
865 056fe1ba 2003-11-23 devnull 		assert(0);
866 056fe1ba 2003-11-23 devnull 	case PFront:
867 056fe1ba 2003-11-23 devnull 		m->rp = m->bp;
868 056fe1ba 2003-11-23 devnull 		break;
869 056fe1ba 2003-11-23 devnull 	case PMiddle:
870 056fe1ba 2003-11-23 devnull 		/* leave a little bit at end */
871 056fe1ba 2003-11-23 devnull 		m->rp = m->ep - n - 32;
872 056fe1ba 2003-11-23 devnull 		break;
873 056fe1ba 2003-11-23 devnull 	case PEnd:
874 056fe1ba 2003-11-23 devnull 		m->rp = m->ep - n;
875 056fe1ba 2003-11-23 devnull 		break; 
876 056fe1ba 2003-11-23 devnull 	}
877 056fe1ba 2003-11-23 devnull 	/* check we did not blow it */
878 056fe1ba 2003-11-23 devnull 	if(m->rp < m->bp)
879 056fe1ba 2003-11-23 devnull 		m->rp = m->bp;
880 056fe1ba 2003-11-23 devnull 	m->wp = m->rp + n;
881 056fe1ba 2003-11-23 devnull 	assert(m->rp >= m->bp && m->wp <= m->ep);
882 056fe1ba 2003-11-23 devnull 	return m;
883 056fe1ba 2003-11-23 devnull }
884 056fe1ba 2003-11-23 devnull 
885 056fe1ba 2003-11-23 devnull static void
886 056fe1ba 2003-11-23 devnull memfree(Mem *m)
887 056fe1ba 2003-11-23 devnull {
888 056fe1ba 2003-11-23 devnull 	lock(&m->lk);
889 056fe1ba 2003-11-23 devnull 	m->ref--;
890 056fe1ba 2003-11-23 devnull 	if(m->ref > 0) {
891 056fe1ba 2003-11-23 devnull 		unlock(&m->lk);
892 056fe1ba 2003-11-23 devnull 		return;
893 056fe1ba 2003-11-23 devnull 	}
894 056fe1ba 2003-11-23 devnull 	unlock(&m->lk);
895 056fe1ba 2003-11-23 devnull 	assert(m->ref == 0);
896 056fe1ba 2003-11-23 devnull 
897 056fe1ba 2003-11-23 devnull 	switch(m->ep - m->bp) {
898 056fe1ba 2003-11-23 devnull 	default:
899 056fe1ba 2003-11-23 devnull 		assert(0);
900 056fe1ba 2003-11-23 devnull 	case SmallMemSize:
901 056fe1ba 2003-11-23 devnull 		lock(&freelist.lk);
902 056fe1ba 2003-11-23 devnull 		m->next = freelist.smallmem;
903 056fe1ba 2003-11-23 devnull 		freelist.smallmem = m;
904 056fe1ba 2003-11-23 devnull 		unlock(&freelist.lk);
905 056fe1ba 2003-11-23 devnull 		break;
906 056fe1ba 2003-11-23 devnull 	case BigMemSize:
907 056fe1ba 2003-11-23 devnull 		lock(&freelist.lk);
908 056fe1ba 2003-11-23 devnull 		m->next = freelist.bigmem;
909 056fe1ba 2003-11-23 devnull 		freelist.bigmem = m;
910 056fe1ba 2003-11-23 devnull 		unlock(&freelist.lk);
911 056fe1ba 2003-11-23 devnull 		break;
912 056fe1ba 2003-11-23 devnull 	}
913 056fe1ba 2003-11-23 devnull }
914 056fe1ba 2003-11-23 devnull 
915 056fe1ba 2003-11-23 devnull static int
916 056fe1ba 2003-11-23 devnull memhead(Mem *m, uchar *rp, int n)
917 056fe1ba 2003-11-23 devnull {
918 056fe1ba 2003-11-23 devnull 	lock(&m->lk);
919 056fe1ba 2003-11-23 devnull 	if(m->rp != rp) {
920 056fe1ba 2003-11-23 devnull 		unlock(&m->lk);
921 056fe1ba 2003-11-23 devnull 		return -1;
922 056fe1ba 2003-11-23 devnull 	}
923 056fe1ba 2003-11-23 devnull 	m->rp -= n;
924 056fe1ba 2003-11-23 devnull 	unlock(&m->lk);
925 056fe1ba 2003-11-23 devnull 	return 0;
926 056fe1ba 2003-11-23 devnull }
927 056fe1ba 2003-11-23 devnull 
928 056fe1ba 2003-11-23 devnull static int
929 056fe1ba 2003-11-23 devnull memtail(Mem *m, uchar *wp, int n)
930 056fe1ba 2003-11-23 devnull {
931 056fe1ba 2003-11-23 devnull 	lock(&m->lk);
932 056fe1ba 2003-11-23 devnull 	if(m->wp != wp) {
933 056fe1ba 2003-11-23 devnull 		unlock(&m->lk);
934 056fe1ba 2003-11-23 devnull 		return -1;
935 056fe1ba 2003-11-23 devnull 	}
936 056fe1ba 2003-11-23 devnull 	m->wp += n;
937 056fe1ba 2003-11-23 devnull 	unlock(&m->lk);
938 056fe1ba 2003-11-23 devnull 	return 0;
939 056fe1ba 2003-11-23 devnull }