tcp: Initial image description

Introduce the image file for tcp info, its entry and the show method.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Makefile

@@ -40,6 +40,7 @@ OBJS		+= log.o
 OBJS		+= libnetlink.o
 OBJS		+= sockets.o
 OBJS		+= sk-inet.o
+OBJS		+= sk-tcp.o
 OBJS		+= sk-unix.o
 OBJS		+= sk-queue.o
 OBJS		+= files.o

crtools.c

@@ -196,6 +196,12 @@ struct cr_fd_desc_tmpl fdset_template[CR_FD_MAX] = {
 		.magic	= GHOST_FILE_MAGIC,
 		.show	= show_ghost_file,
 	},
+
+	[CR_FD_TCP_STREAM] = {
+		.fmt	= FMT_FNAME_TCP_STREAM,
+		.magic	= TCP_STREAM_MAGIC,
+		.show	= show_tcp_stream,
+	},
 };
 
 static struct cr_fdset *alloc_cr_fdset(int nr)

include/crtools.h

@@ -45,6 +45,7 @@ enum {
 	CR_FD_PSTREE,
 	CR_FD_SHMEM_PAGES,
 	CR_FD_GHOST_FILE,
+	CR_FD_TCP_STREAM,
 
 	_CR_FD_GLOB_FROM,
 	CR_FD_SK_QUEUES,
@@ -129,6 +130,7 @@ extern struct cr_fd_desc_tmpl fdset_template[CR_FD_MAX];
 #define FMT_FNAME_FS		"fs-%d.img"
 #define FMT_FNAME_REMAP_FPATH	"remap-fpath.img"
 #define FMT_FNAME_GHOST_FILE	"ghost-file-%x.img"
+#define FMT_FNAME_TCP_STREAM	"tcp-stream-%x.img"
 
 extern int open_image_dir(void);
 extern void close_image_dir(void);

include/image.h

@@ -32,6 +32,7 @@
 #define MM_MAGIC		0x57492820 /* Pskov */
 #define REMAP_FPATH_MAGIC	0x59133954 /* Vologda */
 #define GHOST_FILE_MAGIC	0x52583605 /* Oryol */
+#define TCP_STREAM_MAGIC	0x51465506 /* Orenburg */
 
 #define PIPEFS_MAGIC	0x50495045
 
@@ -155,6 +156,17 @@ struct inet_sk_entry {
 	u32	dst_addr[4];
 } __packed;
 
+struct tcp_stream_entry {
+	u32	inq_len;
+	u32	inq_seq;
+	u32	outq_len;
+	u32	outq_seq;
+
+	u8	opt_mask;	/* TCPI_OPT_ bits */
+	u8	snd_wscale;
+	u16	mss_clamp;
+} __packed;
+
 struct sk_packet_entry {
 	u32	id_for;
 	u32	length;

include/sk-inet.h

@@ -35,4 +35,7 @@ static inline int restore_one_tcp(int sk, struct inet_sk_info *si)
 }
 
 #define SK_EST_PARAM	"tcp-established"
+
+struct cr_options;
+void show_tcp_stream(int fd, struct cr_options *);
 #endif

sk-tcp.c

+#include <netinet/tcp.h>
+#include "types.h"
+#include "sockets.h"
+#include "files.h"
+#include "sk-inet.h"
+
+void show_tcp_stream(int fd, struct cr_options *opt)
+{
+	struct tcp_stream_entry tse;
+	pr_img_head(CR_FD_TCP_STREAM);
+
+	if (read_img(fd, &tse) > 0) {
+		pr_msg("IN:   seq %10u len %10u\n", tse.inq_seq, tse.inq_len);
+		pr_msg("OUT:  seq %10u len %10u\n", tse.outq_seq, tse.outq_len);
+		pr_msg("OPTS: %#x\n", (int)tse.opt_mask);
+		pr_msg("\tmss_clamp %u\n", (int)tse.mss_clamp);
+		if (tse.opt_mask & TCPI_OPT_WSCALE)
+			pr_msg("\twscale %u\n", (int)tse.snd_wscale);
+		if (tse.opt_mask & TCPI_OPT_TIMESTAMPS)
+			pr_msg("\ttimestamps\n");
+		if (tse.opt_mask & TCPI_OPT_SACK)
+			pr_msg("\tsack\n");
+	}
+
+	pr_img_tail(CR_FD_TCP_STREAM);
+}