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Date: Mon, 5 Jan 2009 15:42:22 +0100
From: Gerrit Renker <gerrit@....abdn.ac.uk>
To: dccp@...r.kernel.org, netdev@...r.kernel.org
Subject: dccp test tree [RFC/RFT] [Patch 2/3] dccp: CCID-independent probe
plugin
dccp: Remove CCID-3 specific code from dccp_probe
This creates a function pointer to wrap CCID-specific code, since
CCID-specific code should not be mixed with the general DCCP code
(in particular when CCID-3 is disabled via Kconfig).
Resolving module dependencies did not work satisfactorily in the
current dccp_probe, so I created an explicit depdency by putting
the probe handler into output.c.
% modprobe -v dccp_probe
insmod /lib/modules/2.6.28/kernel/net/dccp/dccp.ko
insmod /lib/modules/2.6.28/kernel/net/dccp/dccp_probe.ko
--> Still, there may be more elegant solutions to this: I'd welcome
suggestions.
Signed-off-by: Gerrit Renker <gerrit@....abdn.ac.uk>
---
net/dccp/ccid.h | 11 +++++++++++
net/dccp/ccids/ccid3.c | 14 ++++++++++++++
net/dccp/dccp.h | 1 +
net/dccp/output.c | 8 ++++++++
net/dccp/probe.c | 29 ++++++++++++-----------------
5 files changed, 46 insertions(+), 17 deletions(-)
--- a/net/dccp/ccid.h
+++ b/net/dccp/ccid.h
@@ -40,6 +40,7 @@ struct tcp_info;
* @ccid_hc_tx_packet_recv: implements feedback processing for the HC-sender
* @ccid_hc_tx_send_packet: implements the sending part of the HC-sender
* @ccid_hc_tx_packet_sent: does accounting for packets in flight by HC-sender
+ * @ccid_hc_tx_probe: CCID-dependent hook for dccp_probe
* @ccid_hc_{r,t}x_get_info: INET_DIAG information for HC-receiver/sender
* @ccid_hc_{r,t}x_getsockopt: socket options specific to HC-receiver/sender
*/
@@ -70,6 +71,8 @@ struct ccid_operations {
struct sk_buff *skb);
void (*ccid_hc_tx_packet_sent)(struct sock *sk,
unsigned int len);
+ size_t (*ccid_hc_tx_probe)(struct sock *sk,
+ char *buf, const size_t maxlen);
void (*ccid_hc_rx_get_info)(struct sock *sk,
struct tcp_info *info);
void (*ccid_hc_tx_get_info)(struct sock *sk,
@@ -174,6 +177,14 @@ static inline void ccid_hc_tx_packet_sen
ccid->ccid_ops->ccid_hc_tx_packet_sent(sk, len);
}
+static inline size_t ccid_hc_tx_probe(struct ccid *ccid, struct sock *sk,
+ char *buf, const size_t maxlen)
+{
+ if (ccid->ccid_ops->ccid_hc_tx_probe != NULL)
+ return ccid->ccid_ops->ccid_hc_tx_probe(sk, buf, maxlen);
+ return 0;
+}
+
static inline void ccid_hc_rx_packet_recv(struct ccid *ccid, struct sock *sk,
struct sk_buff *skb)
{
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -362,6 +362,19 @@ static void ccid3_hc_tx_packet_sent(stru
DCCP_CRIT("packet history - out of memory!");
}
+static size_t ccid3_hc_tx_probe(struct sock *sk, char *buf, const size_t maxlen)
+{
+ struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
+
+ /* Specific field numbering:
+ 5 6 7 8 9 10 11
+ s rtt p X_calc X_recv X t_ipi */
+ return snprintf(buf, maxlen, " %d %d %d %u %u %u %d",
+ hctx->s, hctx->rtt, hctx->p, hctx->x_calc,
+ (unsigned)(hctx->x_recv >> 6),
+ (unsigned)(hctx->x >> 6), hctx->t_ipi);
+}
+
static void ccid3_hc_tx_packet_recv(struct sock *sk, struct sk_buff *skb)
{
struct ccid3_hc_tx_sock *hctx = ccid3_hc_tx_sk(sk);
@@ -848,6 +861,7 @@ struct ccid_operations ccid3_ops = {
.ccid_hc_tx_exit = ccid3_hc_tx_exit,
.ccid_hc_tx_send_packet = ccid3_hc_tx_send_packet,
.ccid_hc_tx_packet_sent = ccid3_hc_tx_packet_sent,
+ .ccid_hc_tx_probe = ccid3_hc_tx_probe,
.ccid_hc_tx_packet_recv = ccid3_hc_tx_packet_recv,
.ccid_hc_tx_parse_options = ccid3_hc_tx_parse_options,
.ccid_hc_rx_obj_size = sizeof(struct ccid3_hc_rx_sock),
--- a/net/dccp/probe.c
+++ b/net/dccp/probe.c
@@ -34,7 +34,6 @@
#include "dccp.h"
#include "ccid.h"
-#include "ccids/ccid3.h"
static int port;
@@ -52,30 +51,26 @@ static struct {
static void jdccp_write_xmit(struct sock *sk)
{
const struct inet_sock *inet = inet_sk(sk);
- struct ccid3_hc_tx_sock *hctx = NULL;
- struct timespec tv;
- char buf[256];
- int len, ccid = ccid_get_current_tx_ccid(dccp_sk(sk));
-
- if (ccid == DCCPC_CCID3)
- hctx = ccid3_hc_tx_sk(sk);
if (!port || ntohs(inet->dport) == port || ntohs(inet->sport) == port) {
-
- tv = ktime_to_timespec(ktime_sub(ktime_get(), dccpw.start));
- len = sprintf(buf, "%lu.%09lu %pI4:%u %pI4:%u %u",
+ char buf[256];
+ struct timespec tv;
+ int len, ccid;
+
+ tv = ktime_to_timespec(ktime_sub(ktime_get(), dccpw.start));
+ ccid = ccid_get_current_tx_ccid(dccp_sk(sk));
+ /* Basic field numbering (remainder is CCID-dependent):
+ 1 2 3 4
+ sec.usec source dest ccid */
+ len = sprintf(buf, "%lu.%09lu %pI4:%u %pI4:%u %u",
(unsigned long)tv.tv_sec,
(unsigned long)tv.tv_nsec,
&inet->saddr, ntohs(inet->sport),
&inet->daddr, ntohs(inet->dport), ccid);
- if (hctx)
- len += sprintf(buf + len, " %d %d %d %u %u %u %d",
- hctx->s, hctx->rtt, hctx->p, hctx->x_calc,
- (unsigned)(hctx->x_recv >> 6),
- (unsigned)(hctx->x >> 6), hctx->t_ipi);
-
+ len += dccp_xmit_probe(sk, buf + len, sizeof(buf) - len - 1);
len += sprintf(buf + len, "\n");
+
kfifo_put(dccpw.fifo, buf, len);
wake_up(&dccpw.wait);
}
--- a/net/dccp/dccp.h
+++ b/net/dccp/dccp.h
@@ -235,6 +235,7 @@ extern void dccp_send_sync(struct sock *
const enum dccp_pkt_type pkt_type);
extern void dccp_write_xmit(struct sock *sk);
+extern size_t dccp_xmit_probe(struct sock *sk, char *buf, const size_t maxlen);
extern void dccp_write_space(struct sock *sk);
extern void dccp_flush_write_queue(struct sock *sk, long *time_budget);
--- a/net/dccp/output.c
+++ b/net/dccp/output.c
@@ -365,6 +365,14 @@ void dccp_write_xmit(struct sock *sk)
}
}
+size_t dccp_xmit_probe(struct sock *sk, char *buf, const size_t maxlen)
+{
+ struct ccid *tx_ccid = dccp_sk(sk)->dccps_hc_tx_ccid;
+
+ return tx_ccid == NULL ? 0 : ccid_hc_tx_probe(tx_ccid, sk, buf, maxlen);
+}
+EXPORT_SYMBOL_GPL(dccp_xmit_probe);
+
/**
* dccp_retransmit_skb - Retransmit Request, Close, or CloseReq packets
* There are only four retransmittable packet types in DCCP:
--
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