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[DCCP] ackvec: infrastructure for sending more than one ackvec per packet

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Commiter note:

This was split from Andrea's original patch, in the process I changed the type
of the ackvec index fields to u16 instead of to int and haven't folded
dccp_ackvec_parse with dccp_ackvec_check_rcv_ackno.

Next patch will actually do the insertion of more than one ackvec per packet,
using, initially, up to a max of 2 ackvecs as per Andrea's original patch, then
I'll work on support for larger ackvecs, be it using a sysctl or using
setsockopt.

Signed-off-by: Andrea Bittau <a.bittau@cs.ucl.ac.uk>
Signed-off-by: Arnaldo Carvalho de Melo <acme@mandriva.com>
This commit is contained in:
Andrea Bittau 2006-11-24 13:02:42 -02:00 committed by David S. Miller
parent 0bd4ff1b15
commit bdf13d208d
3 changed files with 24 additions and 20 deletions
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23
net/dccp/ackvec.c
View file

@ -169,13 +169,13 @@ void dccp_ackvec_free(struct dccp_ackvec *av)
}
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;
}
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;
}
@ -275,7 +275,7 @@ int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
* could reduce the complexity of this scan.)
*/
u64 delta = dccp_delta_seqno(ackno, av->dccpav_buf_ackno);
u8 index = av->dccpav_buf_head;
u32 index = av->dccpav_buf_head;
while (1) {
const u8 len = dccp_ackvec_len(av, index);
@ -385,7 +385,7 @@ void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av, struct sock *sk,
}
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)
{
@ -408,7 +408,7 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
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
@ -416,13 +416,13 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
*/
list_for_each_entry_from(avr, &av->dccpav_records,
dccpavr_node) {
if (!after48(avr->dccpavr_ack_seqno, ackno))
if (!after48(avr->dccpavr_ack_seqno, *ackno))
goto found;
}
/* End of the dccpav_records list, not found, exit */
break;
found:
if (between48(avr->dccpavr_ack_seqno, ackno_end_rl, ackno)) {
if (between48(avr->dccpavr_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, "
@ -442,21 +442,20 @@ static void dccp_ackvec_check_rcv_ackvector(struct dccp_ackvec *av,
*/
}
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_MAX_ACKVEC_OPT_LEN)
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;
}

18
net/dccp/ackvec.h
View file

@ -17,7 +17,9 @@
#include <linux/types.h>
/* Read about the ECN nonce to see why it is 253 */
#define DCCP_MAX_ACKVEC_LEN 253
#define DCCP_MAX_ACKVEC_OPT_LEN 253
/* We can spread an ack vector across multiple options */
#define DCCP_MAX_ACKVEC_LEN (DCCP_MAX_ACKVEC_OPT_LEN * 2)
#define DCCP_ACKVEC_STATE_RECEIVED 0
#define DCCP_ACKVEC_STATE_ECN_MARKED (1 << 6)
@ -51,8 +53,8 @@ struct dccp_ackvec {
u64 dccpav_buf_ackno;
struct list_head dccpav_records;
struct timeval dccpav_time;
u8 dccpav_buf_head;
u8 dccpav_vec_len;
u16 dccpav_buf_head;
u16 dccpav_vec_len;
u8 dccpav_buf_nonce;
u8 dccpav_ack_nonce;
u8 dccpav_buf[DCCP_MAX_ACKVEC_LEN];
@ -75,9 +77,9 @@ struct dccp_ackvec_record {
struct list_head dccpavr_node;
u64 dccpavr_ack_seqno;
u64 dccpavr_ack_ackno;
u8 dccpavr_ack_ptr;
u16 dccpavr_ack_ptr;
u16 dccpavr_sent_len;
u8 dccpavr_ack_nonce;
u8 dccpavr_sent_len;
};
struct sock;
@ -96,7 +98,8 @@ extern int dccp_ackvec_add(struct dccp_ackvec *av, const struct sock *sk,
extern void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av,
struct sock *sk, const u64 ackno);
extern 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);
extern int dccp_insert_option_ackvec(struct sock *sk, struct sk_buff *skb);
@ -135,7 +138,8 @@ static inline void dccp_ackvec_check_rcv_ackno(struct dccp_ackvec *av,
}
static inline int dccp_ackvec_parse(struct sock *sk, const struct sk_buff *skb,
const u8 opt, const u8 *value, const u8 len)
const u64 *ackno, const u8 opt,
const u8 *value, const u8 len)
{
return -1;
}

3
net/dccp/options.c
View file

@ -62,6 +62,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
struct dccp_sock *dp = dccp_sk(sk);
const struct dccp_hdr *dh = dccp_hdr(skb);
const u8 pkt_type = DCCP_SKB_CB(skb)->dccpd_type;
u64 ackno = DCCP_SKB_CB(skb)->dccpd_ack_seq;
unsigned char *options = (unsigned char *)dh + dccp_hdr_len(skb);
unsigned char *opt_ptr = options;
const unsigned char *opt_end = (unsigned char *)dh +
@ -149,7 +150,7 @@ int dccp_parse_options(struct sock *sk, struct sk_buff *skb)
break;
if (dccp_msk(sk)->dccpms_send_ack_vector &&
dccp_ackvec_parse(sk, skb, opt, value, len))
dccp_ackvec_parse(sk, skb, &ackno, opt, value, len))
goto out_invalid_option;
break;
case DCCPO_TIMESTAMP: