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-rw-r--r--net/dccp/Kconfig16
-rw-r--r--net/dccp/Makefile2
-rw-r--r--net/dccp/ccids/ccid2.c2
-rw-r--r--net/dccp/ccids/ccid3.c2
-rw-r--r--net/dccp/ipv4.c3
-rw-r--r--net/dccp/probe.c198
-rw-r--r--net/dccp/proto.c11
7 files changed, 219 insertions, 15 deletions
diff --git a/net/dccp/Kconfig b/net/dccp/Kconfig
index 859e3359fcd..e2a095d0fd8 100644
--- a/net/dccp/Kconfig
+++ b/net/dccp/Kconfig
@@ -40,6 +40,22 @@ config IP_DCCP_DEBUG
Just say N.
+config NET_DCCPPROBE
+ tristate "DCCP connection probing"
+ depends on PROC_FS && KPROBES
+ ---help---
+ This module allows for capturing the changes to DCCP connection
+ state in response to incoming packets. It is used for debugging
+ DCCP congestion avoidance modules. If you don't understand
+ what was just said, you don't need it: say N.
+
+ Documentation on how to use the packet generator can be found
+ at http://linux-net.osdl.org/index.php/DccpProbe
+
+ To compile this code as a module, choose M here: the
+ module will be called dccp_probe.
+
+
endmenu
endmenu
diff --git a/net/dccp/Makefile b/net/dccp/Makefile
index 7696e219b05..17ed99c4661 100644
--- a/net/dccp/Makefile
+++ b/net/dccp/Makefile
@@ -11,9 +11,11 @@ dccp_ipv4-y := ipv4.o
dccp-$(CONFIG_IP_DCCP_ACKVEC) += ackvec.o
obj-$(CONFIG_INET_DCCP_DIAG) += dccp_diag.o
+obj-$(CONFIG_NET_DCCPPROBE) += dccp_probe.o
dccp-$(CONFIG_SYSCTL) += sysctl.o
dccp_diag-y := diag.o
+dccp_probe-y := probe.o
obj-y += ccids/
diff --git a/net/dccp/ccids/ccid2.c b/net/dccp/ccids/ccid2.c
index 457dd3db7f4..2efb505aeb3 100644
--- a/net/dccp/ccids/ccid2.c
+++ b/net/dccp/ccids/ccid2.c
@@ -808,7 +808,7 @@ static void ccid2_hc_rx_packet_recv(struct sock *sk, struct sk_buff *skb)
}
static struct ccid_operations ccid2 = {
- .ccid_id = 2,
+ .ccid_id = DCCPC_CCID2,
.ccid_name = "ccid2",
.ccid_owner = THIS_MODULE,
.ccid_hc_tx_obj_size = sizeof(struct ccid2_hc_tx_sock),
diff --git a/net/dccp/ccids/ccid3.c b/net/dccp/ccids/ccid3.c
index 195aa956622..67d2dc0e7c6 100644
--- a/net/dccp/ccids/ccid3.c
+++ b/net/dccp/ccids/ccid3.c
@@ -1240,7 +1240,7 @@ static int ccid3_hc_tx_getsockopt(struct sock *sk, const int optname, int len,
}
static struct ccid_operations ccid3 = {
- .ccid_id = 3,
+ .ccid_id = DCCPC_CCID3,
.ccid_name = "ccid3",
.ccid_owner = THIS_MODULE,
.ccid_hc_tx_obj_size = sizeof(struct ccid3_hc_tx_sock),
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 9a1a76a7dc4..66be29b6f50 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -56,9 +56,6 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
dp->dccps_role = DCCP_ROLE_CLIENT;
- if (dccp_service_not_initialized(sk))
- return -EPROTO;
-
if (addr_len < sizeof(struct sockaddr_in))
return -EINVAL;
diff --git a/net/dccp/probe.c b/net/dccp/probe.c
new file mode 100644
index 00000000000..146496fce2e
--- /dev/null
+++ b/net/dccp/probe.c
@@ -0,0 +1,198 @@
+/*
+ * dccp_probe - Observe the DCCP flow with kprobes.
+ *
+ * The idea for this came from Werner Almesberger's umlsim
+ * Copyright (C) 2004, Stephen Hemminger <shemminger@osdl.org>
+ *
+ * Modified for DCCP from Stephen Hemminger's code
+ * Copyright (C) 2006, Ian McDonald <ian.mcdonald@jandi.co.nz>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#include <linux/kernel.h>
+#include <linux/kprobes.h>
+#include <linux/socket.h>
+#include <linux/dccp.h>
+#include <linux/proc_fs.h>
+#include <linux/module.h>
+#include <linux/kfifo.h>
+#include <linux/vmalloc.h>
+
+#include "dccp.h"
+#include "ccid.h"
+#include "ccids/ccid3.h"
+
+static int port;
+
+static int bufsize = 64 * 1024;
+
+static const char procname[] = "dccpprobe";
+
+struct {
+ struct kfifo *fifo;
+ spinlock_t lock;
+ wait_queue_head_t wait;
+ struct timeval tstart;
+} dccpw;
+
+static void printl(const char *fmt, ...)
+{
+ va_list args;
+ int len;
+ struct timeval now;
+ char tbuf[256];
+
+ va_start(args, fmt);
+ do_gettimeofday(&now);
+
+ now.tv_sec -= dccpw.tstart.tv_sec;
+ now.tv_usec -= dccpw.tstart.tv_usec;
+ if (now.tv_usec < 0) {
+ --now.tv_sec;
+ now.tv_usec += 1000000;
+ }
+
+ len = sprintf(tbuf, "%lu.%06lu ",
+ (unsigned long) now.tv_sec,
+ (unsigned long) now.tv_usec);
+ len += vscnprintf(tbuf+len, sizeof(tbuf)-len, fmt, args);
+ va_end(args);
+
+ kfifo_put(dccpw.fifo, tbuf, len);
+ wake_up(&dccpw.wait);
+}
+
+static int jdccp_sendmsg(struct kiocb *iocb, struct sock *sk,
+ struct msghdr *msg, size_t size)
+{
+ const struct dccp_minisock *dmsk = dccp_msk(sk);
+ const struct inet_sock *inet = inet_sk(sk);
+ const struct ccid3_hc_tx_sock *hctx;
+
+ if (dmsk->dccpms_tx_ccid == DCCPC_CCID3)
+ hctx = ccid3_hc_tx_sk(sk);
+ else
+ hctx = NULL;
+
+ if (port == 0 || ntohs(inet->dport) == port ||
+ ntohs(inet->sport) == port) {
+ if (hctx)
+ printl("%d.%d.%d.%d:%u %d.%d.%d.%d:%u %d %d %d %d %d\n",
+ NIPQUAD(inet->saddr), ntohs(inet->sport),
+ NIPQUAD(inet->daddr), ntohs(inet->dport), size,
+ hctx->ccid3hctx_s, hctx->ccid3hctx_rtt,
+ hctx->ccid3hctx_p, hctx->ccid3hctx_t_ipi);
+ else
+ printl("%d.%d.%d.%d:%u %d.%d.%d.%d:%u %d\n",
+ NIPQUAD(inet->saddr), ntohs(inet->sport),
+ NIPQUAD(inet->daddr), ntohs(inet->dport), size);
+ }
+
+ jprobe_return();
+ return 0;
+}
+
+static struct jprobe dccp_send_probe = {
+ .kp = { .addr = (kprobe_opcode_t *)&dccp_sendmsg, },
+ .entry = (kprobe_opcode_t *)&jdccp_sendmsg,
+};
+
+static int dccpprobe_open(struct inode *inode, struct file *file)
+{
+ kfifo_reset(dccpw.fifo);
+ do_gettimeofday(&dccpw.tstart);
+ return 0;
+}
+
+static ssize_t dccpprobe_read(struct file *file, char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ int error = 0, cnt = 0;
+ unsigned char *tbuf;
+
+ if (!buf || len < 0)
+ return -EINVAL;
+
+ if (len == 0)
+ return 0;
+
+ tbuf = vmalloc(len);
+ if (!tbuf)
+ return -ENOMEM;
+
+ error = wait_event_interruptible(dccpw.wait,
+ __kfifo_len(dccpw.fifo) != 0);
+ if (error)
+ goto out_free;
+
+ cnt = kfifo_get(dccpw.fifo, tbuf, len);
+ error = copy_to_user(buf, tbuf, cnt);
+
+out_free:
+ vfree(tbuf);
+
+ return error ? error : cnt;
+}
+
+static struct file_operations dccpprobe_fops = {
+ .owner = THIS_MODULE,
+ .open = dccpprobe_open,
+ .read = dccpprobe_read,
+};
+
+static __init int dccpprobe_init(void)
+{
+ int ret = -ENOMEM;
+
+ init_waitqueue_head(&dccpw.wait);
+ spin_lock_init(&dccpw.lock);
+ dccpw.fifo = kfifo_alloc(bufsize, GFP_KERNEL, &dccpw.lock);
+
+ if (!proc_net_fops_create(procname, S_IRUSR, &dccpprobe_fops))
+ goto err0;
+
+ ret = register_jprobe(&dccp_send_probe);
+ if (ret)
+ goto err1;
+
+ pr_info("DCCP watch registered (port=%d)\n", port);
+ return 0;
+err1:
+ proc_net_remove(procname);
+err0:
+ kfifo_free(dccpw.fifo);
+ return ret;
+}
+module_init(dccpprobe_init);
+
+static __exit void dccpprobe_exit(void)
+{
+ kfifo_free(dccpw.fifo);
+ proc_net_remove(procname);
+ unregister_jprobe(&dccp_send_probe);
+
+}
+module_exit(dccpprobe_exit);
+
+MODULE_PARM_DESC(port, "Port to match (0=all)");
+module_param(port, int, 0);
+
+MODULE_PARM_DESC(bufsize, "Log buffer size (default 64k)");
+module_param(bufsize, int, 0);
+
+MODULE_AUTHOR("Ian McDonald <ian.mcdonald@jandi.co.nz>");
+MODULE_DESCRIPTION("DCCP snooper");
+MODULE_LICENSE("GPL");
diff --git a/net/dccp/proto.c b/net/dccp/proto.c
index 962df0ea31a..72cbdcfc2c6 100644
--- a/net/dccp/proto.c
+++ b/net/dccp/proto.c
@@ -217,7 +217,7 @@ int dccp_init_sock(struct sock *sk, const __u8 ctl_sock_initialized)
icsk->icsk_sync_mss = dccp_sync_mss;
dp->dccps_mss_cache = 536;
dp->dccps_role = DCCP_ROLE_UNDEFINED;
- dp->dccps_service = DCCP_SERVICE_INVALID_VALUE;
+ dp->dccps_service = DCCP_SERVICE_CODE_IS_ABSENT;
dp->dccps_l_ack_ratio = dp->dccps_r_ack_ratio = 1;
return 0;
@@ -267,12 +267,6 @@ static inline int dccp_listen_start(struct sock *sk)
struct dccp_sock *dp = dccp_sk(sk);
dp->dccps_role = DCCP_ROLE_LISTEN;
- /*
- * Apps need to use setsockopt(DCCP_SOCKOPT_SERVICE)
- * before calling listen()
- */
- if (dccp_service_not_initialized(sk))
- return -EPROTO;
return inet_csk_listen_start(sk, TCP_SYNQ_HSIZE);
}
@@ -540,9 +534,6 @@ static int dccp_getsockopt_service(struct sock *sk, int len,
int err = -ENOENT, slen = 0, total_len = sizeof(u32);
lock_sock(sk);
- if (dccp_service_not_initialized(sk))
- goto out;
-
if ((sl = dp->dccps_service_list) != NULL) {
slen = sl->dccpsl_nr * sizeof(u32);
total_len += slen;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-04 02:04:32 +0000