#include "ackvec.h"
#include "dccp.h"
-#include <linux/dccp.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <net/sock.h>
-static kmem_cache_t *dccp_ackvec_slab;
-static kmem_cache_t *dccp_ackvec_record_slab;
+static struct kmem_cache *dccp_ackvec_slab;
+static struct kmem_cache *dccp_ackvec_record_slab;
static struct dccp_ackvec_record *dccp_ackvec_record_new(void)
{
kmem_cache_alloc(dccp_ackvec_record_slab, GFP_ATOMIC);
if (avr != NULL)
- INIT_LIST_HEAD(&avr->dccpavr_node);
+ INIT_LIST_HEAD(&avr->avr_node);
return avr;
}
if (unlikely(avr == NULL))
return;
/* Check if deleting a linked record */
- WARN_ON(!list_empty(&avr->dccpavr_node));
+ WARN_ON(!list_empty(&avr->avr_node));
kmem_cache_free(dccp_ackvec_record_slab, avr);
}
* just add the AVR at the head of the list.
* -sorbo.
*/
- if (!list_empty(&av->dccpav_records)) {
+ if (!list_empty(&av->av_records)) {
const struct dccp_ackvec_record *head =
- list_entry(av->dccpav_records.next,
+ list_entry(av->av_records.next,
struct dccp_ackvec_record,
- dccpavr_node);
- BUG_ON(before48(avr->dccpavr_ack_seqno,
- head->dccpavr_ack_seqno));
+ avr_node);
+ BUG_ON(before48(avr->avr_ack_seqno, head->avr_ack_seqno));
}
- list_add(&avr->dccpavr_node, &av->dccpav_records);
+ list_add(&avr->avr_node, &av->av_records);
}
int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb)
{
struct dccp_sock *dp = dccp_sk(sk);
struct dccp_ackvec *av = dp->dccps_hc_rx_ackvec;
- int len = av->dccpav_vec_len + 2;
- struct timeval now;
+ /* Figure out how many options do we need to represent the ackvec */
+ const u8 nr_opts = DIV_ROUND_UP(av->av_vec_len, DCCP_SINGLE_OPT_MAXLEN);
+ u16 len = av->av_vec_len + 2 * nr_opts, i;
u32 elapsed_time;
- unsigned char *to, *from;
+ const unsigned char *tail, *from;
+ unsigned char *to;
struct dccp_ackvec_record *avr;
+ suseconds_t delta;
if (DCCP_SKB_CB(skb)->dccpd_opt_len + len > DCCP_MAX_OPT_LEN)
return -1;
- dccp_timestamp(sk, &now);
- elapsed_time = timeval_delta(&now, &av->dccpav_time) / 10;
+ delta = ktime_us_delta(ktime_get_real(), av->av_time);
+ elapsed_time = delta / 10;
if (elapsed_time != 0 &&
- dccp_insert_option_elapsed_time(sk, skb, elapsed_time))
+ dccp_insert_option_elapsed_time(skb, elapsed_time))
return -1;
avr = dccp_ackvec_record_new();
DCCP_SKB_CB(skb)->dccpd_opt_len += len;
- to = skb_push(skb, len);
- *to++ = DCCPO_ACK_VECTOR_0;
- *to++ = len;
+ to = skb_push(skb, len);
+ len = av->av_vec_len;
+ from = av->av_buf + av->av_buf_head;
+ tail = av->av_buf + DCCP_MAX_ACKVEC_LEN;
- len = av->dccpav_vec_len;
- from = av->dccpav_buf + av->dccpav_buf_head;
+ for (i = 0; i < nr_opts; ++i) {
+ int copylen = len;
- /* Check if buf_head wraps */
- if ((int)av->dccpav_buf_head + len > DCCP_MAX_ACKVEC_LEN) {
- const u32 tailsize = DCCP_MAX_ACKVEC_LEN - av->dccpav_buf_head;
+ if (len > DCCP_SINGLE_OPT_MAXLEN)
+ copylen = DCCP_SINGLE_OPT_MAXLEN;
- memcpy(to, from, tailsize);
- to += tailsize;
- len -= tailsize;
- from = av->dccpav_buf;
+ *to++ = DCCPO_ACK_VECTOR_0;
+ *to++ = copylen + 2;
+
+ /* Check if buf_head wraps */
+ if (from + copylen > tail) {
+ const u16 tailsize = tail - from;
+
+ memcpy(to, from, tailsize);
+ to += tailsize;
+ len -= tailsize;
+ copylen -= tailsize;
+ from = av->av_buf;
+ }
+
+ memcpy(to, from, copylen);
+ from += copylen;
+ to += copylen;
+ len -= copylen;
}
- memcpy(to, from, len);
/*
* From RFC 4340, A.2:
*
* buf_head; ack_ackno will equal buf_ackno; and ack_nonce will
* equal buf_nonce.
*/
- avr->dccpavr_ack_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
- avr->dccpavr_ack_ptr = av->dccpav_buf_head;
- avr->dccpavr_ack_ackno = av->dccpav_buf_ackno;
- avr->dccpavr_ack_nonce = av->dccpav_buf_nonce;
- avr->dccpavr_sent_len = av->dccpav_vec_len;
+ avr->avr_ack_seqno = DCCP_SKB_CB(skb)->dccpd_seq;
+ avr->avr_ack_ptr = av->av_buf_head;
+ avr->avr_ack_ackno = av->av_buf_ackno;
+ avr->avr_ack_nonce = av->av_buf_nonce;
+ avr->avr_sent_len = av->av_vec_len;
dccp_ackvec_insert_avr(av, avr);
dccp_pr_debug("%s ACK Vector 0, len=%d, ack_seqno=%llu, "
"ack_ackno=%llu\n",
- dccp_role(sk), avr->dccpavr_sent_len,
- (unsigned long long)avr->dccpavr_ack_seqno,
- (unsigned long long)avr->dccpavr_ack_ackno);
+ dccp_role(sk), avr->avr_sent_len,
+ (unsigned long long)avr->avr_ack_seqno,
+ (unsigned long long)avr->avr_ack_ackno);
return 0;
}
struct dccp_ackvec *av = kmem_cache_alloc(dccp_ackvec_slab, priority);
if (av != NULL) {
- av->dccpav_buf_head = DCCP_MAX_ACKVEC_LEN - 1;
- av->dccpav_buf_ackno = DCCP_MAX_SEQNO + 1;
- av->dccpav_buf_nonce = av->dccpav_buf_nonce = 0;
- av->dccpav_ack_ptr = 0;
- av->dccpav_time.tv_sec = 0;
- av->dccpav_time.tv_usec = 0;
- av->dccpav_vec_len = 0;
- INIT_LIST_HEAD(&av->dccpav_records);
+ av->av_buf_head = DCCP_MAX_ACKVEC_LEN - 1;
+ av->av_buf_ackno = UINT48_MAX + 1;
+ av->av_buf_nonce = 0;
+ av->av_time = ktime_set(0, 0);
+ av->av_vec_len = 0;
+ INIT_LIST_HEAD(&av->av_records);
}
return av;
if (unlikely(av == NULL))
return;
- if (!list_empty(&av->dccpav_records)) {
+ if (!list_empty(&av->av_records)) {
struct dccp_ackvec_record *avr, *next;
- list_for_each_entry_safe(avr, next, &av->dccpav_records,
- dccpavr_node) {
- list_del_init(&avr->dccpavr_node);
+ list_for_each_entry_safe(avr, next, &av->av_records, avr_node) {
+ list_del_init(&avr->avr_node);
dccp_ackvec_record_delete(avr);
}
}
}
static inline u8 dccp_ackvec_state(const struct dccp_ackvec *av,
- const u8 index)
+ const u32 index)
{
- return av->dccpav_buf[index] & DCCP_ACKVEC_STATE_MASK;
+ return av->av_buf[index] & DCCP_ACKVEC_STATE_MASK;
}
static inline u8 dccp_ackvec_len(const struct dccp_ackvec *av,
- const u8 index)
+ const u32 index)
{
- return av->dccpav_buf[index] & DCCP_ACKVEC_LEN_MASK;
+ return av->av_buf[index] & DCCP_ACKVEC_LEN_MASK;
}
/*
const unsigned int packets,
const unsigned char state)
{
- unsigned int gap;
+ long gap;
long new_head;
- if (av->dccpav_vec_len + packets > DCCP_MAX_ACKVEC_LEN)
+ if (av->av_vec_len + packets > DCCP_MAX_ACKVEC_LEN)
return -ENOBUFS;
gap = packets - 1;
- new_head = av->dccpav_buf_head - packets;
+ new_head = av->av_buf_head - packets;
if (new_head < 0) {
if (gap > 0) {
- memset(av->dccpav_buf, DCCP_ACKVEC_STATE_NOT_RECEIVED,
+ memset(av->av_buf, DCCP_ACKVEC_STATE_NOT_RECEIVED,
gap + new_head + 1);
gap = -new_head;
}
new_head += DCCP_MAX_ACKVEC_LEN;
- }
+ }
- av->dccpav_buf_head = new_head;
+ av->av_buf_head = new_head;
if (gap > 0)
- memset(av->dccpav_buf + av->dccpav_buf_head + 1,
+ memset(av->av_buf + av->av_buf_head + 1,
DCCP_ACKVEC_STATE_NOT_RECEIVED, gap);
- av->dccpav_buf[av->dccpav_buf_head] = state;
- av->dccpav_vec_len += packets;
+ av->av_buf[av->av_buf_head] = state;
+ av->av_vec_len += packets;
return 0;
}
/*
* Check at the right places if the buffer is full, if it is, tell the
* caller to start dropping packets till the HC-Sender acks our ACK
- * vectors, when we will free up space in dccpav_buf.
+ * vectors, when we will free up space in av_buf.
*
* We may well decide to do buffer compression, etc, but for now lets
* just drop.
*/
/* See if this is the first ackno being inserted */
- if (av->dccpav_vec_len == 0) {
- av->dccpav_buf[av->dccpav_buf_head] = state;
- av->dccpav_vec_len = 1;
- } else if (after48(ackno, av->dccpav_buf_ackno)) {
- const u64 delta = dccp_delta_seqno(av->dccpav_buf_ackno,
- ackno);
+ if (av->av_vec_len == 0) {
+ av->av_buf[av->av_buf_head] = state;
+ av->av_vec_len = 1;
+ } else if (after48(ackno, av->av_buf_ackno)) {
+ const u64 delta = dccp_delta_seqno(av->av_buf_ackno, ackno);
/*
* Look if the state of this packet is the same as the
* previous ackno and if so if we can bump the head len.
*/
if (delta == 1 &&
- dccp_ackvec_state(av, av->dccpav_buf_head) == state &&
- (dccp_ackvec_len(av, av->dccpav_buf_head) <
- DCCP_ACKVEC_LEN_MASK))
- av->dccpav_buf[av->dccpav_buf_head]++;
+ dccp_ackvec_state(av, av->av_buf_head) == state &&
+ dccp_ackvec_len(av, av->av_buf_head) < DCCP_ACKVEC_LEN_MASK)
+ av->av_buf[av->av_buf_head]++;
else if (dccp_ackvec_set_buf_head_state(av, delta, state))
return -ENOBUFS;
} else {
* the byte corresponding to S. (Indexing structures
* could reduce the complexity of this scan.)
*/
- u64 delta = dccp_delta_seqno(ackno, av->dccpav_buf_ackno);
- u8 index = av->dccpav_buf_head;
+ u64 delta = dccp_delta_seqno(ackno, av->av_buf_ackno);
+ u32 index = av->av_buf_head;
while (1) {
const u8 len = dccp_ackvec_len(av, index);
- const u8 state = dccp_ackvec_state(av, index);
+ const u8 av_state = dccp_ackvec_state(av, index);
/*
- * valid packets not yet in dccpav_buf have a reserved
+ * valid packets not yet in av_buf have a reserved
* entry, with a len equal to 0.
*/
- if (state == DCCP_ACKVEC_STATE_NOT_RECEIVED &&
+ if (av_state == DCCP_ACKVEC_STATE_NOT_RECEIVED &&
len == 0 && delta == 0) { /* Found our
reserved seat! */
dccp_pr_debug("Found %llu reserved seat!\n",
(unsigned long long)ackno);
- av->dccpav_buf[index] = state;
+ av->av_buf[index] = state;
goto out;
}
/* len == 0 means one packet */
}
}
- av->dccpav_buf_ackno = ackno;
- dccp_timestamp(sk, &av->dccpav_time);
+ av->av_buf_ackno = ackno;
+ av->av_time = ktime_get_real();
out:
return 0;
return -EILSEQ;
}
-#ifdef CONFIG_IP_DCCP_DEBUG
-void dccp_ackvector_print(const u64 ackno, const unsigned char *vector, int len)
-{
- dccp_pr_debug_cat("ACK vector len=%d, ackno=%llu |", len,
- (unsigned long long)ackno);
-
- while (len--) {
- const u8 state = (*vector & DCCP_ACKVEC_STATE_MASK) >> 6;
- const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
-
- dccp_pr_debug_cat("%d,%d|", state, rl);
- ++vector;
- }
-
- dccp_pr_debug_cat("\n");
-}
-
-void dccp_ackvec_print(const struct dccp_ackvec *av)
-{
- dccp_ackvector_print(av->dccpav_buf_ackno,
- av->dccpav_buf + av->dccpav_buf_head,
- av->dccpav_vec_len);
-}
-#endif
-
static void dccp_ackvec_throw_record(struct dccp_ackvec *av,
struct dccp_ackvec_record *avr)
{
struct dccp_ackvec_record *next;
/* sort out vector length */
- if (av->dccpav_buf_head <= avr->dccpavr_ack_ptr)
- av->dccpav_vec_len = avr->dccpavr_ack_ptr - av->dccpav_buf_head;
+ if (av->av_buf_head <= avr->avr_ack_ptr)
+ av->av_vec_len = avr->avr_ack_ptr - av->av_buf_head;
else
- av->dccpav_vec_len = DCCP_MAX_ACKVEC_LEN - 1
- - av->dccpav_buf_head
- + avr->dccpavr_ack_ptr;
+ av->av_vec_len = DCCP_MAX_ACKVEC_LEN - 1 -
+ av->av_buf_head + avr->avr_ack_ptr;
/* free records */
- list_for_each_entry_safe_from(avr, next, &av->dccpav_records,
- dccpavr_node) {
- list_del_init(&avr->dccpavr_node);
+ list_for_each_entry_safe_from(avr, next, &av->av_records, avr_node) {
+ list_del_init(&avr->avr_node);
dccp_ackvec_record_delete(avr);
}
}
* windows. We will be receiving ACKs for stuff we sent a while back
* -sorbo.
*/
- list_for_each_entry_reverse(avr, &av->dccpav_records, dccpavr_node) {
- if (ackno == avr->dccpavr_ack_seqno) {
+ list_for_each_entry_reverse(avr, &av->av_records, avr_node) {
+ if (ackno == avr->avr_ack_seqno) {
dccp_pr_debug("%s ACK packet 0, len=%d, ack_seqno=%llu, "
"ack_ackno=%llu, ACKED!\n",
dccp_role(sk), 1,
- (unsigned long long)avr->dccpavr_ack_seqno,
- (unsigned long long)avr->dccpavr_ack_ackno);
+ (unsigned long long)avr->avr_ack_seqno,
+ (unsigned long long)avr->avr_ack_ackno);
dccp_ackvec_throw_record(av, avr);
break;
- } else if (avr->dccpavr_ack_seqno > ackno)
+ } else if (avr->avr_ack_seqno > ackno)
break; /* old news */
}
}
static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
- struct sock *sk, u64 ackno,
+ struct sock *sk, u64 *ackno,
const unsigned char len,
const unsigned char *vector)
{
struct dccp_ackvec_record *avr;
/* Check if we actually sent an ACK vector */
- if (list_empty(&av->dccpav_records))
+ if (list_empty(&av->av_records))
return;
i = len;
* I think it might be more efficient to work backwards. See comment on
* rcv_ackno. -sorbo.
*/
- avr = list_entry(av->dccpav_records.next, struct dccp_ackvec_record,
- dccpavr_node);
+ avr = list_entry(av->av_records.next, struct dccp_ackvec_record, avr_node);
while (i--) {
const u8 rl = *vector & DCCP_ACKVEC_LEN_MASK;
u64 ackno_end_rl;
- dccp_set_seqno(&ackno_end_rl, ackno - rl);
+ dccp_set_seqno(&ackno_end_rl, *ackno - rl);
/*
* If our AVR sequence number is greater than the ack, go
* forward in the AVR list until it is not so.
*/
- list_for_each_entry_from(avr, &av->dccpav_records,
- dccpavr_node) {
- if (!after48(avr->dccpavr_ack_seqno, ackno))
+ list_for_each_entry_from(avr, &av->av_records, avr_node) {
+ if (!after48(avr->avr_ack_seqno, *ackno))
goto found;
}
- /* End of the dccpav_records list, not found, exit */
+ /* End of the av_records list, not found, exit */
break;
found:
- if (between48(avr->dccpavr_ack_seqno, ackno_end_rl, ackno)) {
+ if (between48(avr->avr_ack_seqno, ackno_end_rl, *ackno)) {
const u8 state = *vector & DCCP_ACKVEC_STATE_MASK;
if (state != DCCP_ACKVEC_STATE_NOT_RECEIVED) {
dccp_pr_debug("%s ACK vector 0, len=%d, "
"ACKED!\n",
dccp_role(sk), len,
(unsigned long long)
- avr->dccpavr_ack_seqno,
+ avr->avr_ack_seqno,
(unsigned long long)
- avr->dccpavr_ack_ackno);
+ avr->avr_ack_ackno);
dccp_ackvec_throw_record(av, avr);
break;
}
*/
}
- dccp_set_seqno(&ackno, ackno_end_rl - 1);
+ dccp_set_seqno(ackno, ackno_end_rl - 1);
++vector;
}
}
int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
- const u8 opt, const u8 *value, const u8 len)
+ u64 *ackno, const u8 opt, const u8 *value, const u8 len)
{
- if (len > DCCP_MAX_ACKVEC_LEN)
+ if (len > DCCP_SINGLE_OPT_MAXLEN)
return -1;
/* dccp_ackvector_print(DCCP_SKB_CB(skb)->dccpd_ack_seq, value, len); */
dccp_ackvec_check_rcv_ackvector(dccp_sk(sk)->dccps_hc_rx_ackvec, sk,
- DCCP_SKB_CB(skb)->dccpd_ack_seq,
- len, value);
+ ackno, len, value);
return 0;
}
{
dccp_ackvec_slab = kmem_cache_create("dccp_ackvec",
sizeof(struct dccp_ackvec), 0,
- SLAB_HWCACHE_ALIGN, NULL, NULL);
+ SLAB_HWCACHE_ALIGN, NULL);
if (dccp_ackvec_slab == NULL)
goto out_err;
dccp_ackvec_record_slab =
kmem_cache_create("dccp_ackvec_record",
sizeof(struct dccp_ackvec_record),
- 0, SLAB_HWCACHE_ALIGN, NULL, NULL);
+ 0, SLAB_HWCACHE_ALIGN, NULL);
if (dccp_ackvec_record_slab == NULL)
goto out_destroy_slab;
Code Review / linux-2.6.git / blobdiff