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-rw-r--r--net/dccp/ackvec.c178
-rw-r--r--net/dccp/ackvec.h103
-rw-r--r--net/dccp/ccids/ccid2.c13
-rw-r--r--net/dccp/input.c6
-rw-r--r--net/dccp/options.c1
5 files changed, 128 insertions, 173 deletions
diff --git a/net/dccp/ackvec.c b/net/dccp/ackvec.c
index 92a6fcb40d7d..17bf10f96057 100644
--- a/net/dccp/ackvec.c
+++ b/net/dccp/ackvec.c
@@ -1,7 +1,8 @@
1/* 1/*
2 * net/dccp/ackvec.c 2 * net/dccp/ackvec.c
3 * 3 *
4 * An implementation of the DCCP protocol 4 * An implementation of Ack Vectors for the DCCP protocol
5 * Copyright (c) 2007 University of Aberdeen, Scotland, UK
5 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net> 6 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
6 * 7 *
7 * This program is free software; you can redistribute it and/or modify it 8 * This program is free software; you can redistribute it and/or modify it
@@ -23,24 +24,32 @@
23static struct kmem_cache *dccp_ackvec_slab; 24static struct kmem_cache *dccp_ackvec_slab;
24static struct kmem_cache *dccp_ackvec_record_slab; 25static struct kmem_cache *dccp_ackvec_record_slab;
25 26
26static struct dccp_ackvec_record *dccp_ackvec_record_new(void) 27struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
27{ 28{
28 struct dccp_ackvec_record *avr = 29 struct dccp_ackvec *av = kmem_cache_zalloc(dccp_ackvec_slab, priority);
29 kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC); 30
31 if (av != NULL) {
32 av->av_buf_head = DCCPAV_MAX_ACKVEC_LEN - 1;
33 INIT_LIST_HEAD(&av->av_records);
34 }
35 return av;
36}
30 37
31 if (avr != NULL) 38static void dccp_ackvec_purge_records(struct dccp_ackvec *av)
32 INIT_LIST_HEAD(&avr->avr_node); 39{
40 struct dccp_ackvec_record *cur, *next;
33 41
34 return avr; 42 list_for_each_entry_safe(cur, next, &av->av_records, avr_node)
43 kmem_cache_free(dccp_ackvec_record_slab, cur);
44 INIT_LIST_HEAD(&av->av_records);
35} 45}
36 46
37static void dccp_ackvec_record_delete(struct dccp_ackvec_record *avr) 47void dccp_ackvec_free(struct dccp_ackvec *av)
38{ 48{
39 if (unlikely(avr == NULL)) 49 if (likely(av != NULL)) {
40 return; 50 dccp_ackvec_purge_records(av);
41 /* Check if deleting a linked record */ 51 kmem_cache_free(dccp_ackvec_slab, av);
42 WARN_ON(!list_empty(&avr->avr_node)); 52 }
43 kmem_cache_free(dccp_ackvec_record_slab, avr);
44} 53}
45 54
46static void dccp_ackvec_insert_avr(struct dccp_ackvec *av, 55static void dccp_ackvec_insert_avr(struct dccp_ackvec *av,
@@ -68,24 +77,16 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
68 struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec; 77 struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
69 /* Figure out how many options do we need to represent the ackvec */ 78 /* Figure out how many options do we need to represent the ackvec */
70 const u8 nr_opts = DIV_ROUND_UP(av->av_vec_len, DCCP_SINGLE_OPT_MAXLEN); 79 const u8 nr_opts = DIV_ROUND_UP(av->av_vec_len, DCCP_SINGLE_OPT_MAXLEN);
71 u16 len = av->av_vec_len + 2 * nr_opts, i; 80 u16 len = av->av_vec_len + 2 * nr_opts;
72 u32 elapsed_time; 81 u8 i, nonce = 0;
73 const unsigned char *tail, *from; 82 const unsigned char *tail, *from;
74 unsigned char *to; 83 unsigned char *to;
75 struct dccp_ackvec_record *avr; 84 struct dccp_ackvec_record *avr;
76 suseconds_t delta;
77 85
78 if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN) 86 if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
79 return -1; 87 return -1;
80 88
81 delta = ktime_us_delta(ktime_get_real(), av->av_time); 89 avr = kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
82 elapsed_time = delta / 10;
83
84 if (elapsed_time != 0 &&
85 dccp_insert_option_elapsed_time(skb, elapsed_time))
86 return -1;
87
88 avr = dccp_ackvec_record_new();
89 if (avr == NULL) 90 if (avr == NULL)
90 return -1; 91 return -1;
91 92
@@ -94,7 +95,7 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
94 to = skb_push(skb, len); 95 to = skb_push(skb, len);
95 len = av->av_vec_len; 96 len = av->av_vec_len;
96 from = av->av_buf + av->av_buf_head; 97 from = av->av_buf + av->av_buf_head;
97 tail = av->av_buf + DCCP_MAX_ACKVEC_LEN; 98 tail = av->av_buf + DCCPAV_MAX_ACKVEC_LEN;
98 99
99 for (i = 0; i < nr_opts; ++i) { 100 for (i = 0; i < nr_opts; ++i) {
100 int copylen = len; 101 int copylen = len;
@@ -102,7 +103,13 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
102 if (len > DCCP_SINGLE_OPT_MAXLEN) 103 if (len > DCCP_SINGLE_OPT_MAXLEN)
103 copylen = DCCP_SINGLE_OPT_MAXLEN; 104 copylen = DCCP_SINGLE_OPT_MAXLEN;
104 105
105 *to++ = DCCPO_ACK_VECTOR_0; 106 /*
107 * RFC 4340, 12.2: Encode the Nonce Echo for this Ack Vector via
108 * its type; ack_nonce is the sum of all individual buf_nonce's.
109 */
110 nonce ^= av->av_buf_nonce[i];
111
112 *to++ = DCCPO_ACK_VECTOR_0 + av->av_buf_nonce[i];
106 *to++ = copylen + 2; 113 *to++ = copylen + 2;
107 114
108 /* Check if buf_head wraps */ 115 /* Check if buf_head wraps */
@@ -123,75 +130,24 @@ int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
123 } 130 }
124 131
125 /* 132 /*
126 * From RFC 4340, A.2: 133 * Each sent Ack Vector is recorded in the list, as per A.2 of RFC 4340.
127 *
128 * For each acknowledgement it sends, the HC-Receiver will add an
129 * acknowledgement record. ack_seqno will equal the HC-Receiver
130 * sequence number it used for the ack packet; ack_ptr will equal
131 * buf_head; ack_ackno will equal buf_ackno; and ack_nonce will
132 * equal buf_nonce.
133 */ 134 */
134 avr->avr_ack_seqno = DCCP_SKB_CB(skb)->dccpd_seq; 135 avr->avr_ack_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
135 avr->avr_ack_ptr = av->av_buf_head; 136 avr->avr_ack_ptr = av->av_buf_head;
136 avr->avr_ack_ackno = av->av_buf_ackno; 137 avr->avr_ack_ackno = av->av_buf_ackno;
137 avr->avr_ack_nonce = av->av_buf_nonce; 138 avr->avr_ack_nonce = nonce;
138 avr->avr_sent_len = av->av_vec_len; 139 avr->avr_ack_runlen = dccp_ackvec_runlen(av->av_buf + av->av_buf_head);
139 140
140 dccp_ackvec_insert_avr(av, avr); 141 dccp_ackvec_insert_avr(av, avr);
141 142
142 dccp_pr_debug("%s ACK Vector 0, len=%d, ack_seqno=%llu, " 143 dccp_pr_debug("%s ACK Vector 0, len=%d, ack_seqno=%llu, "
143 "ack_ackno=%llu\n", 144 "ack_ackno=%llu\n",
144 dccp_role(sk), avr->avr_sent_len, 145 dccp_role(sk), avr->avr_ack_runlen,
145 (unsigned long long)avr->avr_ack_seqno, 146 (unsigned long long)avr->avr_ack_seqno,
146 (unsigned long long)avr->avr_ack_ackno); 147 (unsigned long long)avr->avr_ack_ackno);
147 return 0; 148 return 0;
148} 149}
149 150
150struct dccp_ackvec *dccp_ackvec_alloc(const gfp_t priority)
151{
152 struct dccp_ackvec *av = kmem_cache_alloc(dccp_ackvec_slab, priority);
153
154 if (av != NULL) {
155 av->av_buf_head = DCCP_MAX_ACKVEC_LEN - 1;
156 av->av_buf_ackno = UINT48_MAX + 1;
157 av->av_buf_nonce = 0;
158 av->av_time = ktime_set(0, 0);
159 av->av_vec_len = 0;
160 INIT_LIST_HEAD(&av->av_records);
161 }
162
163 return av;
164}
165
166void dccp_ackvec_free(struct dccp_ackvec *av)
167{
168 if (unlikely(av == NULL))
169 return;
170
171 if (!list_empty(&av->av_records)) {
172 struct dccp_ackvec_record *avr, *next;
173
174 list_for_each_entry_safe(avr, next, &av->av_records, avr_node) {
175 list_del_init(&avr->avr_node);
176 dccp_ackvec_record_delete(avr);
177 }
178 }
179
180 kmem_cache_free(dccp_ackvec_slab, av);
181}
182
183static inline u8 dccp_ackvec_state(const struct dccp_ackvec *av,
184 const u32 index)
185{
186 return av->av_buf[index] & DCCP_ACKVEC_STATE_MASK;
187}
188
189static inline u8 dccp_ackvec_len(const struct dccp_ackvec *av,
190 const u32 index)
191{
192 return av->av_buf[index] & DCCP_ACKVEC_LEN_MASK;
193}
194
195/* 151/*
196 * If several packets are missing, the HC-Receiver may prefer to enter multiple 152 * If several packets are missing, the HC-Receiver may prefer to enter multiple
197 * bytes with run length 0, rather than a single byte with a larger run length; 153 * bytes with run length 0, rather than a single byte with a larger run length;
@@ -204,7 +160,7 @@ static inline int dccp_ackvec_set_buf_head_state(struct dccp_ackvec *av,
204 long gap; 160 long gap;
205 long new_head; 161 long new_head;
206 162
207 if (av->av_vec_len + packets > DCCP_MAX_ACKVEC_LEN) 163 if (av->av_vec_len + packets > DCCPAV_MAX_ACKVEC_LEN)
208 return -ENOBUFS; 164 return -ENOBUFS;
209 165
210 gap = packets - 1; 166 gap = packets - 1;
@@ -212,18 +168,18 @@ static inline int dccp_ackvec_set_buf_head_state(struct dccp_ackvec *av,
212 168
213 if (new_head < 0) { 169 if (new_head < 0) {
214 if (gap > 0) { 170 if (gap > 0) {
215 memset(av->av_buf, DCCP_ACKVEC_STATE_NOT_RECEIVED, 171 memset(av->av_buf, DCCPAV_NOT_RECEIVED,
216 gap + new_head + 1); 172 gap + new_head + 1);
217 gap = -new_head; 173 gap = -new_head;
218 } 174 }
219 new_head += DCCP_MAX_ACKVEC_LEN; 175 new_head += DCCPAV_MAX_ACKVEC_LEN;
220 } 176 }
221 177
222 av->av_buf_head = new_head; 178 av->av_buf_head = new_head;
223 179
224 if (gap > 0) 180 if (gap > 0)
225 memset(av->av_buf + av->av_buf_head + 1, 181 memset(av->av_buf + av->av_buf_head + 1,
226 DCCP_ACKVEC_STATE_NOT_RECEIVED, gap); 182 DCCPAV_NOT_RECEIVED, gap);
227 183
228 av->av_buf[av->av_buf_head] = state; 184 av->av_buf[av->av_buf_head] = state;
229 av->av_vec_len += packets; 185 av->av_vec_len += packets;
@@ -236,6 +192,8 @@ static inline int dccp_ackvec_set_buf_head_state(struct dccp_ackvec *av,
236int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk, 192int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
237 const u64 ackno, const u8 state) 193 const u64 ackno, const u8 state)
238{ 194{
195 u8 *cur_head = av->av_buf + av->av_buf_head,
196 *buf_end = av->av_buf + DCCPAV_MAX_ACKVEC_LEN;
239 /* 197 /*
240 * Check at the right places if the buffer is full, if it is, tell the 198 * Check at the right places if the buffer is full, if it is, tell the
241 * caller to start dropping packets till the HC-Sender acks our ACK 199 * caller to start dropping packets till the HC-Sender acks our ACK
@@ -260,7 +218,7 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
260 218
261 /* See if this is the first ackno being inserted */ 219 /* See if this is the first ackno being inserted */
262 if (av->av_vec_len == 0) { 220 if (av->av_vec_len == 0) {
263 av->av_buf[av->av_buf_head] = state; 221 *cur_head = state;
264 av->av_vec_len = 1; 222 av->av_vec_len = 1;
265 } else if (after48(ackno, av->av_buf_ackno)) { 223 } else if (after48(ackno, av->av_buf_ackno)) {
266 const u64 delta = dccp_delta_seqno(av->av_buf_ackno, ackno); 224 const u64 delta = dccp_delta_seqno(av->av_buf_ackno, ackno);
@@ -269,10 +227,9 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
269 * Look if the state of this packet is the same as the 227 * Look if the state of this packet is the same as the
270 * previous ackno and if so if we can bump the head len. 228 * previous ackno and if so if we can bump the head len.
271 */ 229 */
272 if (delta == 1 && 230 if (delta == 1 && dccp_ackvec_state(cur_head) == state &&
273 dccp_ackvec_state(av, av->av_buf_head) == state && 231 dccp_ackvec_runlen(cur_head) < DCCPAV_MAX_RUNLEN)
274 dccp_ackvec_len(av, av->av_buf_head) < DCCP_ACKVEC_LEN_MASK) 232 *cur_head += 1;
275 av->av_buf[av->av_buf_head]++;
276 else if (dccp_ackvec_set_buf_head_state(av, delta, state)) 233 else if (dccp_ackvec_set_buf_head_state(av, delta, state))
277 return -ENOBUFS; 234 return -ENOBUFS;
278 } else { 235 } else {
@@ -285,21 +242,17 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
285 * could reduce the complexity of this scan.) 242 * could reduce the complexity of this scan.)
286 */ 243 */
287 u64 delta = dccp_delta_seqno(ackno, av->av_buf_ackno); 244 u64 delta = dccp_delta_seqno(ackno, av->av_buf_ackno);
288 u32 index = av->av_buf_head;
289 245
290 while (1) { 246 while (1) {
291 const u8 len = dccp_ackvec_len(av, index); 247 const u8 len = dccp_ackvec_runlen(cur_head);
292 const u8 av_state = dccp_ackvec_state(av, index);
293 /* 248 /*
294 * valid packets not yet in av_buf have a reserved 249 * valid packets not yet in av_buf have a reserved
295 * entry, with a len equal to 0. 250 * entry, with a len equal to 0.
296 */ 251 */
297 if (av_state == DCCP_ACKVEC_STATE_NOT_RECEIVED && 252 if (*cur_head == DCCPAV_NOT_RECEIVED && delta == 0) {
298 len == 0 && delta == 0) { /* Found our
299 reserved seat! */
300 dccp_pr_debug("Found %llu reserved seat!\n", 253 dccp_pr_debug("Found %llu reserved seat!\n",
301 (unsigned long long)ackno); 254 (unsigned long long)ackno);
302 av->av_buf[index] = state; 255 *cur_head = state;
303 goto out; 256 goto out;
304 } 257 }
305 /* len == 0 means one packet */ 258 /* len == 0 means one packet */
@@ -307,13 +260,12 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
307 goto out_duplicate; 260 goto out_duplicate;
308 261
309 delta -= len + 1; 262 delta -= len + 1;
310 if (++index == DCCP_MAX_ACKVEC_LEN) 263 if (++cur_head == buf_end)
311 index = 0; 264 cur_head = av->av_buf;
312 } 265 }
313 } 266 }
314 267
315 av->av_buf_ackno = ackno; 268 av->av_buf_ackno = ackno;
316 av->av_time = ktime_get_real();
317out: 269out:
318 return 0; 270 return 0;
319 271
@@ -333,13 +285,13 @@ static void dccp_ackvec_throw_record(struct dccp_ackvec *av,
333 if (av->av_buf_head <= avr->avr_ack_ptr) 285 if (av->av_buf_head <= avr->avr_ack_ptr)
334 av->av_vec_len = avr->avr_ack_ptr - av->av_buf_head; 286 av->av_vec_len = avr->avr_ack_ptr - av->av_buf_head;
335 else 287 else
336 av->av_vec_len = DCCP_MAX_ACKVEC_LEN - 1 - 288 av->av_vec_len = DCCPAV_MAX_ACKVEC_LEN - 1 -
337 av->av_buf_head + avr->avr_ack_ptr; 289 av->av_buf_head + avr->avr_ack_ptr;
338 290
339 /* free records */ 291 /* free records */
340 list_for_each_entry_safe_from(avr, next, &av->av_records, avr_node) { 292 list_for_each_entry_safe_from(avr, next, &av->av_records, avr_node) {
341 list_del_init(&avr->avr_node); 293 list_del(&avr->avr_node);
342 dccp_ackvec_record_delete(avr); 294 kmem_cache_free(dccp_ackvec_record_slab, avr);
343 } 295 }
344} 296}
345 297
@@ -357,7 +309,7 @@ void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av, struct sock *sk,
357 if (ackno == avr->avr_ack_seqno) { 309 if (ackno == avr->avr_ack_seqno) {
358 dccp_pr_debug("%s ACK packet 0, len=%d, ack_seqno=%llu, " 310 dccp_pr_debug("%s ACK packet 0, len=%d, ack_seqno=%llu, "
359 "ack_ackno=%llu, ACKED!\n", 311 "ack_ackno=%llu, ACKED!\n",
360 dccp_role(sk), 1, 312 dccp_role(sk), avr->avr_ack_runlen,
361 (unsigned long long)avr->avr_ack_seqno, 313 (unsigned long long)avr->avr_ack_seqno,
362 (unsigned long long)avr->avr_ack_ackno); 314 (unsigned long long)avr->avr_ack_ackno);
363 dccp_ackvec_throw_record(av, avr); 315 dccp_ackvec_throw_record(av, avr);
@@ -387,7 +339,7 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
387 */ 339 */
388 avr = list_entry(av->av_records.next, struct dccp_ackvec_record, avr_node); 340 avr = list_entry(av->av_records.next, struct dccp_ackvec_record, avr_node);
389 while (i--) { 341 while (i--) {
390 const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK; 342 const u8 rl = dccp_ackvec_runlen(vector);
391 u64 ackno_end_rl; 343 u64 ackno_end_rl;
392 344
393 dccp_set_seqno(&ackno_end_rl, *ackno - rl); 345 dccp_set_seqno(&ackno_end_rl, *ackno - rl);
@@ -404,8 +356,7 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
404 break; 356 break;
405found: 357found:
406 if (between48(avr->avr_ack_seqno, ackno_end_rl, *ackno)) { 358 if (between48(avr->avr_ack_seqno, ackno_end_rl, *ackno)) {
407 const u8 state = *vector & DCCP_ACKVEC_STATE_MASK; 359 if (dccp_ackvec_state(vector) != DCCPAV_NOT_RECEIVED) {
408 if (state != DCCP_ACKVEC_STATE_NOT_RECEIVED) {
409 dccp_pr_debug("%s ACK vector 0, len=%d, " 360 dccp_pr_debug("%s ACK vector 0, len=%d, "
410 "ack_seqno=%llu, ack_ackno=%llu, " 361 "ack_seqno=%llu, ack_ackno=%llu, "
411 "ACKED!\n", 362 "ACKED!\n",
@@ -448,10 +399,9 @@ int __init dccp_ackvec_init(void)
448 if (dccp_ackvec_slab == NULL) 399 if (dccp_ackvec_slab == NULL)
449 goto out_err; 400 goto out_err;
450 401
451 dccp_ackvec_record_slab = 402 dccp_ackvec_record_slab = kmem_cache_create("dccp_ackvec_record",
452 kmem_cache_create("dccp_ackvec_record", 403 sizeof(struct dccp_ackvec_record),
453 sizeof(struct dccp_ackvec_record), 404 0, SLAB_HWCACHE_ALIGN, NULL);
454 0, SLAB_HWCACHE_ALIGN, NULL);
455 if (dccp_ackvec_record_slab == NULL) 405 if (dccp_ackvec_record_slab == NULL)
456 goto out_destroy_slab; 406 goto out_destroy_slab;
457 407
diff --git a/net/dccp/ackvec.h b/net/dccp/ackvec.h
index 7ea557b7c6b1..ebcbbc726cff 100644
--- a/net/dccp/ackvec.h
+++ b/net/dccp/ackvec.h
@@ -3,9 +3,9 @@
3/* 3/*
4 * net/dccp/ackvec.h 4 * net/dccp/ackvec.h
5 * 5 *
6 * An implementation of the DCCP protocol 6 * An implementation of Ack Vectors for the DCCP protocol
7 * Copyright (c) 2007 University of Aberdeen, Scotland, UK
7 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@mandriva.com> 8 * Copyright (c) 2005 Arnaldo Carvalho de Melo <acme@mandriva.com>
8 *
9 * This program is free software; you can redistribute it and/or modify it 9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License version 2 as 10 * under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation. 11 * published by the Free Software Foundation.
@@ -13,75 +13,84 @@
13 13
14#include <linux/dccp.h> 14#include <linux/dccp.h>
15#include <linux/compiler.h> 15#include <linux/compiler.h>
16#include <linux/ktime.h>
17#include <linux/list.h> 16#include <linux/list.h>
18#include <linux/types.h> 17#include <linux/types.h>
19 18
20/* We can spread an ack vector across multiple options */ 19/*
21#define DCCP_MAX_ACKVEC_LEN (DCCP_SINGLE_OPT_MAXLEN * 2) 20 * Ack Vector buffer space is static, in multiples of %DCCP_SINGLE_OPT_MAXLEN,
21 * the maximum size of a single Ack Vector. Setting %DCCPAV_NUM_ACKVECS to 1
22 * will be sufficient for most cases of low Ack Ratios, using a value of 2 gives
23 * more headroom if Ack Ratio is higher or when the sender acknowledges slowly.
24 */
25#define DCCPAV_NUM_ACKVECS 2
26#define DCCPAV_MAX_ACKVEC_LEN (DCCP_SINGLE_OPT_MAXLEN * DCCPAV_NUM_ACKVECS)
22 27
23/* Estimated minimum average Ack Vector length - used for updating MPS */ 28/* Estimated minimum average Ack Vector length - used for updating MPS */
24#define DCCPAV_MIN_OPTLEN 16 29#define DCCPAV_MIN_OPTLEN 16
25 30
26#define DCCP_ACKVEC_STATE_RECEIVED 0 31enum dccp_ackvec_states {
27#define DCCP_ACKVEC_STATE_ECN_MARKED (1 << 6) 32 DCCPAV_RECEIVED = 0x00,
28#define DCCP_ACKVEC_STATE_NOT_RECEIVED (3 << 6) 33 DCCPAV_ECN_MARKED = 0x40,
34 DCCPAV_RESERVED = 0x80,
35 DCCPAV_NOT_RECEIVED = 0xC0
36};
37#define DCCPAV_MAX_RUNLEN 0x3F
29 38
30#define DCCP_ACKVEC_STATE_MASK 0xC0 /* 11000000 */ 39static inline u8 dccp_ackvec_runlen(const u8 *cell)
31#define DCCP_ACKVEC_LEN_MASK 0x3F /* 00111111 */ 40{
41 return *cell & DCCPAV_MAX_RUNLEN;
42}
32 43
33/** struct dccp_ackvec - ack vector 44static inline u8 dccp_ackvec_state(const u8 *cell)
34 * 45{
35 * This data structure is the one defined in RFC 4340, Appendix A. 46 return *cell & ~DCCPAV_MAX_RUNLEN;
36 * 47}
37 * @av_buf_head - circular buffer head 48
38 * @av_buf_tail - circular buffer tail 49/** struct dccp_ackvec - Ack Vector main data structure
39 * @av_buf_ackno - ack # of the most recent packet acknowledgeable in the
40 * buffer (i.e. %av_buf_head)
41 * @av_buf_nonce - the one-bit sum of the ECN Nonces on all packets acked
42 * by the buffer with State 0
43 *
44 * Additionally, the HC-Receiver must keep some information about the
45 * Ack Vectors it has recently sent. For each packet sent carrying an
46 * Ack Vector, it remembers four variables:
47 * 50 *
48 * @av_records - list of dccp_ackvec_record 51 * This implements a fixed-size circular buffer within an array and is largely
49 * @av_ack_nonce - the one-bit sum of the ECN Nonces for all State 0. 52 * based on Appendix A of RFC 4340.
50 * 53 *
51 * @av_time - the time in usecs 54 * @av_buf: circular buffer storage area
52 * @av_buf - circular buffer of acknowledgeable packets 55 * @av_buf_head: head index; begin of live portion in @av_buf
56 * @av_buf_tail: tail index; first index _after_ the live portion in @av_buf
57 * @av_buf_ackno: highest seqno of acknowledgeable packet recorded in @av_buf
58 * @av_buf_nonce: ECN nonce sums, each covering subsequent segments of up to
59 * %DCCP_SINGLE_OPT_MAXLEN cells in the live portion of @av_buf
60 * @av_records: list of %dccp_ackvec_record (Ack Vectors sent previously)
61 * @av_veclen: length of the live portion of @av_buf
53 */ 62 */
54struct dccp_ackvec { 63struct dccp_ackvec {
55 u64 av_buf_ackno; 64 u8 av_buf[DCCPAV_MAX_ACKVEC_LEN];
56 struct list_head av_records;
57 ktime_t av_time;
58 u16 av_buf_head; 65 u16 av_buf_head;
66 u16 av_buf_tail;
67 u64 av_buf_ackno:48;
68 bool av_buf_nonce[DCCPAV_NUM_ACKVECS];
69 struct list_head av_records;
59 u16 av_vec_len; 70 u16 av_vec_len;
60 u8 av_buf_nonce;
61 u8 av_ack_nonce;
62 u8 av_buf[DCCP_MAX_ACKVEC_LEN];
63}; 71};
64 72
65/** struct dccp_ackvec_record - ack vector record 73/** struct dccp_ackvec_record - Records information about sent Ack Vectors
66 * 74 *
67 * ACK vector record as defined in Appendix A of spec. 75 * These list entries define the additional information which the HC-Receiver
76 * keeps about recently-sent Ack Vectors; again refer to RFC 4340, Appendix A.
68 * 77 *
69 * The list is sorted by avr_ack_seqno 78 * @avr_node: the list node in @av_records
79 * @avr_ack_seqno: sequence number of the packet the Ack Vector was sent on
80 * @avr_ack_ackno: the Ack number that this record/Ack Vector refers to
81 * @avr_ack_ptr: pointer into @av_buf where this record starts
82 * @avr_ack_runlen: run length of @avr_ack_ptr at the time of sending
83 * @avr_ack_nonce: the sum of @av_buf_nonce's at the time this record was sent
70 * 84 *
71 * @avr_node - node in av_records 85 * The list as a whole is sorted in descending order by @avr_ack_seqno.
72 * @avr_ack_seqno - sequence number of the packet this record was sent on
73 * @avr_ack_ackno - sequence number being acknowledged
74 * @avr_ack_ptr - pointer into av_buf where this record starts
75 * @avr_ack_nonce - av_ack_nonce at the time this record was sent
76 * @avr_sent_len - lenght of the record in av_buf
77 */ 86 */
78struct dccp_ackvec_record { 87struct dccp_ackvec_record {
79 struct list_head avr_node; 88 struct list_head avr_node;
80 u64 avr_ack_seqno; 89 u64 avr_ack_seqno:48;
81 u64 avr_ack_ackno; 90 u64 avr_ack_ackno:48;
82 u16 avr_ack_ptr; 91 u16 avr_ack_ptr;
83 u16 avr_sent_len; 92 u8 avr_ack_runlen;
84 u8 avr_ack_nonce; 93 u8 avr_ack_nonce:1;
85}; 94};
86 95
87struct sock; 96struct sock;
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 6576eae9e779..cb1b4a0d1877 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -513,8 +513,7 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
513 &vector, &veclen)) != -1) { 513 &vector, &veclen)) != -1) {
514 /* go through this ack vector */ 514 /* go through this ack vector */
515 while (veclen--) { 515 while (veclen--) {
516 const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK; 516 u64 ackno_end_rl = SUB48(ackno, dccp_ackvec_runlen(vector));
517 u64 ackno_end_rl = SUB48(ackno, rl);
518 517
519 ccid2_pr_debug("ackvec start:%llu end:%llu\n", 518 ccid2_pr_debug("ackvec start:%llu end:%llu\n",
520 (unsigned long long)ackno, 519 (unsigned long long)ackno,
@@ -537,17 +536,15 @@ static void ccid2_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
537 * run length 536 * run length
538 */ 537 */
539 while (between48(seqp->ccid2s_seq,ackno_end_rl,ackno)) { 538 while (between48(seqp->ccid2s_seq,ackno_end_rl,ackno)) {
540 const u8 state = *vector & 539 const u8 state = dccp_ackvec_state(vector);
541 DCCP_ACKVEC_STATE_MASK;
542 540
543 /* new packet received or marked */ 541 /* new packet received or marked */
544 if (state != DCCP_ACKVEC_STATE_NOT_RECEIVED && 542 if (state != DCCPAV_NOT_RECEIVED &&
545 !seqp->ccid2s_acked) { 543 !seqp->ccid2s_acked) {
546 if (state == 544 if (state == DCCPAV_ECN_MARKED)
547 DCCP_ACKVEC_STATE_ECN_MARKED) {
548 ccid2_congestion_event(sk, 545 ccid2_congestion_event(sk,
549 seqp); 546 seqp);
550 } else 547 else
551 ccid2_new_ack(sk, seqp, 548 ccid2_new_ack(sk, seqp,
552 &maxincr); 549 &maxincr);
553 550
diff --git a/net/dccp/input.c b/net/dccp/input.c
index 265985370fa1..c7aeeba859d4 100644
--- a/net/dccp/input.c
+++ b/net/dccp/input.c
@@ -378,8 +378,7 @@ int dccp_rcv_established(struct sock *sk, struct sk_buff *skb,
378 378
379 if (dp->dccps_hc_rx_ackvec != NULL && 379 if (dp->dccps_hc_rx_ackvec != NULL &&
380 dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk, 380 dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,
381 DCCP_SKB_CB(skb)->dccpd_seq, 381 DCCP_SKB_CB(skb)->dccpd_seq, DCCPAV_RECEIVED))
382 DCCP_ACKVEC_STATE_RECEIVED))
383 goto discard; 382 goto discard;
384 dccp_deliver_input_to_ccids(sk, skb); 383 dccp_deliver_input_to_ccids(sk, skb);
385 384
@@ -637,8 +636,7 @@ int dccp_rcv_state_process(struct sock *sk, struct sk_buff *skb,
637 636
638 if (dp->dccps_hc_rx_ackvec != NULL && 637 if (dp->dccps_hc_rx_ackvec != NULL &&
639 dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk, 638 dccp_ackvec_add(dp->dccps_hc_rx_ackvec, sk,
640 DCCP_SKB_CB(skb)->dccpd_seq, 639 DCCP_SKB_CB(skb)->dccpd_seq, DCCPAV_RECEIVED))
641 DCCP_ACKVEC_STATE_RECEIVED))
642 goto discard; 640 goto discard;
643 641
644 dccp_deliver_input_to_ccids(sk, skb); 642 dccp_deliver_input_to_ccids(sk, skb);
diff --git a/net/dccp/options.c b/net/dccp/options.c
index cd3061813009..799c6f4547cd 100644
--- a/net/dccp/options.c
+++ b/net/dccp/options.c
@@ -340,6 +340,7 @@ static inline int dccp_elapsed_time_len(const u32 elapsed_time)
340 return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4; 340 return elapsed_time == 0 ? 0 : elapsed_time <= 0xFFFF ? 2 : 4;
341} 341}
342 342
343/* FIXME: This function is currently not used anywhere */
343int dccp_insert_option_elapsed_time(struct sk_buff *skb, u32 elapsed_time) 344int dccp_insert_option_elapsed_time(struct sk_buff *skb, u32 elapsed_time)
344{ 345{
345 const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time); 346 const int elapsed_time_len = dccp_elapsed_time_len(elapsed_time);
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-23 00:56:40 -0500