[PATCH] tcpv4: convert /proc/net/tcp to seq_file

Arnaldo Carvalho de Melo (acme@conectiva.com.br)
Sun, 24 Nov 2002 00:00:46 -0200


Hi David,

Handle with care and please pull from:

master.kernel.org:/home/acme/BK/net-2.5

Now there are two outstanding changesets :-)

- Arnaldo

You can import this changeset into BK by piping this whole message to:
'| bk receive [path to repository]' or apply the patch as usual.

===================================================================

ChangeSet@1.859, 2002-11-23 23:49:24-02:00, acme@conectiva.com.br
o tcpv4: convert /proc/net/tcp to seq_file

af_inet.c | 7
tcp_ipv4.c | 480 +++++++++++++++++++++++++++++++++++++++++++++----------------
2 files changed, 365 insertions(+), 122 deletions(-)

diff -Nru a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
--- a/net/ipv4/af_inet.c Sat Nov 23 23:56:58 2002
+++ b/net/ipv4/af_inet.c Sat Nov 23 23:56:58 2002
@@ -1165,7 +1165,8 @@
extern int ip_misc_proc_init(void);
extern int raw_proc_init(void);
extern void raw_proc_exit(void);
-extern int tcp_get_info(char *buffer, char **start, off_t offset, int length);
+extern int tcp_proc_init(void);
+extern void tcp_proc_exit(void);
extern int udp_proc_init(void);
extern void udp_proc_exit(void);

@@ -1175,7 +1176,7 @@

if (raw_proc_init())
goto out_raw;
- if (!proc_net_create("tcp", 0, tcp_get_info))
+ if (tcp_proc_init())
goto out_tcp;
if (udp_proc_init())
goto out_udp;
@@ -1190,7 +1191,7 @@
out_fib:
udp_proc_exit();
out_udp:
- proc_net_remove("tcp");
+ tcp_proc_exit();
out_tcp:
raw_proc_exit();
out_raw:
diff -Nru a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
--- a/net/ipv4/tcp_ipv4.c Sat Nov 23 23:56:58 2002
+++ b/net/ipv4/tcp_ipv4.c Sat Nov 23 23:56:58 2002
@@ -69,6 +69,8 @@
#include <linux/inet.h>
#include <linux/ipv6.h>
#include <linux/stddef.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>

extern int sysctl_ip_dynaddr;
extern int sysctl_ip_default_ttl;
@@ -2131,7 +2133,295 @@
return 0;
}

+#ifdef CONFIG_PROC_FS
/* Proc filesystem TCP sock list dumping. */
+
+enum tcp_seq_states {
+ TCP_SEQ_STATE_LISTENING,
+ TCP_SEQ_STATE_OPENREQ,
+ TCP_SEQ_STATE_ESTABLISHED,
+ TCP_SEQ_STATE_TIME_WAIT,
+};
+
+struct tcp_iter_state {
+ enum tcp_seq_states state;
+ struct sock *syn_wait_sk;
+ int bucket, sbucket, num, uid;
+};
+
+static void *listening_get_first(struct seq_file *seq)
+{
+ struct tcp_iter_state* st = seq->private;
+ void *rc = NULL;
+
+ for (st->bucket = 0; st->bucket < TCP_LHTABLE_SIZE; ++st->bucket) {
+ struct open_request *req;
+ struct tcp_opt *tp;
+ struct sock *sk = tcp_listening_hash[st->bucket];
+
+ if (!sk)
+ continue;
+ ++st->num;
+ if (TCP_INET_FAMILY(sk->family)) {
+ rc = sk;
+ goto out;
+ }
+ tp = tcp_sk(sk);
+ read_lock_bh(&tp->syn_wait_lock);
+ if (tp->listen_opt && tp->listen_opt->qlen) {
+ st->uid = sock_i_uid(sk);
+ st->syn_wait_sk = sk;
+ st->state = TCP_SEQ_STATE_OPENREQ;
+ for (st->sbucket = 0; st->sbucket < TCP_SYNQ_HSIZE;
+ ++st->sbucket) {
+ for (req = tp->listen_opt->syn_table[st->sbucket];
+ req; req = req->dl_next, ++st->num) {
+ if (!TCP_INET_FAMILY(req->class->family))
+ continue;
+ rc = req;
+ goto out;
+ }
+ }
+ st->state = TCP_SEQ_STATE_LISTENING;
+ }
+ read_unlock_bh(&tp->syn_wait_lock);
+ }
+out:
+ return rc;
+}
+
+static void *listening_get_next(struct seq_file *seq, void *cur)
+{
+ struct tcp_opt *tp;
+ struct sock *sk = cur;
+ struct tcp_iter_state* st = seq->private;
+
+ if (st->state == TCP_SEQ_STATE_OPENREQ) {
+ struct open_request *req = cur;
+
+ tp = tcp_sk(st->syn_wait_sk);
+ req = req->dl_next;
+ while (1) {
+ while (req) {
+ ++st->num;
+ if (TCP_INET_FAMILY(req->class->family)) {
+ cur = req;
+ goto out;
+ }
+ req = req->dl_next;
+ }
+ if (++st->sbucket >= TCP_SYNQ_HSIZE)
+ break;
+get_req:
+ req = tp->listen_opt->syn_table[st->sbucket];
+ }
+ sk = st->syn_wait_sk->next;
+ st->state = TCP_SEQ_STATE_LISTENING;
+ read_unlock_bh(&tp->syn_wait_lock);
+ } else
+ sk = sk->next;
+get_sk:
+ while (sk) {
+ if (TCP_INET_FAMILY(sk->family)) {
+ cur = sk;
+ goto out;
+ }
+ tp = tcp_sk(sk);
+ read_lock_bh(&tp->syn_wait_lock);
+ if (tp->listen_opt && tp->listen_opt->qlen) {
+ st->uid = sock_i_uid(sk);
+ st->syn_wait_sk = sk;
+ st->state = TCP_SEQ_STATE_OPENREQ;
+ st->sbucket = 0;
+ goto get_req;
+ }
+ read_unlock_bh(&tp->syn_wait_lock);
+ }
+ if (++st->bucket < TCP_LHTABLE_SIZE) {
+ sk = tcp_listening_hash[st->bucket];
+ goto get_sk;
+ }
+ cur = NULL;
+out:
+ return cur;
+}
+
+static void *listening_get_idx(struct seq_file *seq, loff_t *pos)
+{
+ void *rc = listening_get_first(seq);
+
+ if (rc)
+ while (*pos && (rc = listening_get_next(seq, rc)))
+ --*pos;
+ return *pos ? NULL : rc;
+}
+
+static void *established_get_first(struct seq_file *seq)
+{
+ struct tcp_iter_state* st = seq->private;
+ void *rc = NULL;
+
+ for (st->bucket = 0; st->bucket < tcp_ehash_size; ++st->bucket) {
+ struct sock *sk;
+ struct tcp_tw_bucket *tw;
+
+ read_lock(&tcp_ehash[st->bucket].lock);
+ for (sk = tcp_ehash[st->bucket].chain; sk;
+ sk = sk->next, ++st->num) {
+ if (!TCP_INET_FAMILY(sk->family))
+ continue;
+ rc = sk;
+ goto out;
+ }
+ st->state = TCP_SEQ_STATE_TIME_WAIT;
+ for (tw = (struct tcp_tw_bucket *)
+ tcp_ehash[st->bucket + tcp_ehash_size].chain;
+ tw; tw = (struct tcp_tw_bucket *)tw->next, ++st->num) {
+ if (!TCP_INET_FAMILY(tw->family))
+ continue;
+ rc = tw;
+ goto out;
+ }
+ read_unlock(&tcp_ehash[st->bucket].lock);
+ st->state = TCP_SEQ_STATE_ESTABLISHED;
+ }
+out:
+ return rc;
+}
+
+static void *established_get_next(struct seq_file *seq, void *cur)
+{
+ struct sock *sk = cur;
+ struct tcp_tw_bucket *tw;
+ struct tcp_iter_state* st = seq->private;
+
+ if (st->state == TCP_SEQ_STATE_TIME_WAIT) {
+ tw = cur;
+ tw = (struct tcp_tw_bucket *)tw->next;
+get_tw:
+ while (tw && !TCP_INET_FAMILY(tw->family)) {
+ ++st->num;
+ tw = (struct tcp_tw_bucket *)tw->next;
+ }
+ if (tw) {
+ cur = tw;
+ goto out;
+ }
+ read_unlock(&tcp_ehash[st->bucket].lock);
+ st->state = TCP_SEQ_STATE_ESTABLISHED;
+ if (++st->bucket < tcp_ehash_size) {
+ read_lock(&tcp_ehash[st->bucket].lock);
+ sk = tcp_ehash[st->bucket].chain;
+ } else {
+ cur = NULL;
+ goto out;
+ }
+ } else
+ sk = sk->next;
+
+ while (sk && !TCP_INET_FAMILY(sk->family)) {
+ ++st->num;
+ sk = sk->next;
+ }
+ if (!sk) {
+ st->state = TCP_SEQ_STATE_TIME_WAIT;
+ tw = (struct tcp_tw_bucket *)
+ tcp_ehash[st->bucket + tcp_ehash_size].chain;
+ goto get_tw;
+ }
+ cur = sk;
+out:
+ return cur;
+}
+
+static void *established_get_idx(struct seq_file *seq, loff_t pos)
+{
+ void *rc = established_get_first(seq);
+
+ if (rc)
+ while (pos && (rc = established_get_next(seq, rc)))
+ --pos;
+ return pos ? NULL : rc;
+}
+
+static void *tcp_get_idx(struct seq_file *seq, loff_t pos)
+{
+ void *rc;
+ struct tcp_iter_state* st = seq->private;
+
+ tcp_listen_lock();
+ st->state = TCP_SEQ_STATE_LISTENING;
+ rc = listening_get_idx(seq, &pos);
+
+ if (!rc) {
+ tcp_listen_unlock();
+ local_bh_disable();
+ st->state = TCP_SEQ_STATE_ESTABLISHED;
+ rc = established_get_idx(seq, pos);
+ }
+
+ return rc;
+}
+
+static void *tcp_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ return *pos ? tcp_get_idx(seq, *pos - 1) : (void *)1;
+}
+
+static void *tcp_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ void *rc = NULL;
+ struct tcp_iter_state* st;
+
+ if (v == (void *)1) {
+ rc = tcp_get_idx(seq, 0);
+ goto out;
+ }
+ st = seq->private;
+
+ switch (st->state) {
+ case TCP_SEQ_STATE_OPENREQ:
+ case TCP_SEQ_STATE_LISTENING:
+ rc = listening_get_next(seq, v);
+ if (!rc) {
+ tcp_listen_unlock();
+ local_bh_disable();
+ st->state = TCP_SEQ_STATE_ESTABLISHED;
+ rc = established_get_first(seq);
+ }
+ break;
+ case TCP_SEQ_STATE_ESTABLISHED:
+ case TCP_SEQ_STATE_TIME_WAIT:
+ rc = established_get_next(seq, v);
+ break;
+ }
+out:
+ ++*pos;
+ return rc;
+}
+
+static void tcp_seq_stop(struct seq_file *seq, void *v)
+{
+ struct tcp_iter_state* st = seq->private;
+
+ switch (st->state) {
+ case TCP_SEQ_STATE_OPENREQ:
+ if (v) {
+ struct tcp_opt *tp = tcp_sk(st->syn_wait_sk);
+ read_unlock_bh(&tp->syn_wait_lock);
+ }
+ case TCP_SEQ_STATE_LISTENING:
+ tcp_listen_unlock();
+ break;
+ case TCP_SEQ_STATE_TIME_WAIT:
+ case TCP_SEQ_STATE_ESTABLISHED:
+ if (v)
+ read_unlock(&tcp_ehash[st->bucket].lock);
+ local_bh_enable();
+ break;
+ }
+}
+
static void get_openreq(struct sock *sk, struct open_request *req,
char *tmpbuf, int i, int uid)
{
@@ -2219,137 +2509,89 @@

#define TMPSZ 150

-int tcp_get_info(char *buffer, char **start, off_t offset, int length)
+static int tcp_seq_show(struct seq_file *seq, void *v)
{
- int len = 0, num = 0, i;
- off_t begin, pos = 0;
+ struct tcp_iter_state* st;
char tmpbuf[TMPSZ + 1];

- if (offset < TMPSZ)
- len += sprintf(buffer, "%-*s\n", TMPSZ - 1,
- " sl local_address rem_address st tx_queue "
- "rx_queue tr tm->when retrnsmt uid timeout "
- "inode");
-
- pos = TMPSZ;
-
- /* First, walk listening socket table. */
- tcp_listen_lock();
- for (i = 0; i < TCP_LHTABLE_SIZE; i++) {
- struct sock *sk;
- struct tcp_listen_opt *lopt;
- int k;
-
- for (sk = tcp_listening_hash[i]; sk; sk = sk->next, num++) {
- struct open_request *req;
- int uid;
- struct tcp_opt *tp = tcp_sk(sk);
-
- if (!TCP_INET_FAMILY(sk->family))
- goto skip_listen;
+ if (v == (void *)1) {
+ seq_printf(seq, "%-*s\n", TMPSZ - 1,
+ " sl local_address rem_address st tx_queue "
+ "rx_queue tr tm->when retrnsmt uid timeout "
+ "inode");
+ goto out;
+ }
+ st = seq->private;

- pos += TMPSZ;
- if (pos >= offset) {
- get_tcp_sock(sk, tmpbuf, num);
- len += sprintf(buffer + len, "%-*s\n",
- TMPSZ - 1, tmpbuf);
- if (pos >= offset + length) {
- tcp_listen_unlock();
- goto out_no_bh;
- }
- }
+ switch (st->state) {
+ case TCP_SEQ_STATE_LISTENING:
+ case TCP_SEQ_STATE_ESTABLISHED:
+ get_tcp_sock(v, tmpbuf, st->num);
+ break;
+ case TCP_SEQ_STATE_OPENREQ:
+ get_openreq(st->syn_wait_sk, v, tmpbuf, st->num, st->uid);
+ break;
+ case TCP_SEQ_STATE_TIME_WAIT:
+ get_timewait_sock(v, tmpbuf, st->num);
+ break;
+ }
+ seq_printf(seq, "%-*s\n", TMPSZ - 1, tmpbuf);
+out:
+ return 0;
+}

-skip_listen:
- uid = sock_i_uid(sk);
- read_lock_bh(&tp->syn_wait_lock);
- lopt = tp->listen_opt;
- if (lopt && lopt->qlen) {
- for (k = 0; k < TCP_SYNQ_HSIZE; k++) {
- for (req = lopt->syn_table[k];
- req; req = req->dl_next, num++) {
- if (!TCP_INET_FAMILY(req->class->family))
- continue;
-
- pos += TMPSZ;
- if (pos <= offset)
- continue;
- get_openreq(sk, req, tmpbuf,
- num, uid);
- len += sprintf(buffer + len,
- "%-*s\n",
- TMPSZ - 1,
- tmpbuf);
- if (pos >= offset + length) {
- read_unlock_bh(&tp->syn_wait_lock);
- tcp_listen_unlock();
- goto out_no_bh;
- }
- }
- }
- }
- read_unlock_bh(&tp->syn_wait_lock);
+static struct seq_operations tcp_seq_ops = {
+ .start = tcp_seq_start,
+ .next = tcp_seq_next,
+ .stop = tcp_seq_stop,
+ .show = tcp_seq_show,
+};

- /* Completed requests are in normal socket hash table */
- }
- }
- tcp_listen_unlock();
+static int tcp_seq_open(struct inode *inode, struct file *file)
+{
+ struct seq_file *seq;
+ int rc = -ENOMEM;
+ struct tcp_iter_state *s = kmalloc(sizeof(*s), GFP_KERNEL);

- local_bh_disable();
+ if (!s)
+ goto out;
+ rc = seq_open(file, &tcp_seq_ops);
+ if (rc)
+ goto out_kfree;
+ seq = file->private_data;
+ seq->private = s;
+ memset(s, 0, sizeof(*s));
+out:
+ return rc;
+out_kfree:
+ kfree(s);
+ goto out;
+}

- /* Next, walk established hash chain. */
- for (i = 0; i < tcp_ehash_size; i++) {
- struct tcp_ehash_bucket *head = &tcp_ehash[i];
- struct sock *sk;
- struct tcp_tw_bucket *tw;
+static struct file_operations tcp_seq_fops = {
+ .open = tcp_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = ip_seq_release,
+};

- read_lock(&head->lock);
- for (sk = head->chain; sk; sk = sk->next, num++) {
- if (!TCP_INET_FAMILY(sk->family))
- continue;
- pos += TMPSZ;
- if (pos <= offset)
- continue;
- get_tcp_sock(sk, tmpbuf, num);
- len += sprintf(buffer + len, "%-*s\n",
- TMPSZ - 1, tmpbuf);
- if (pos >= offset + length) {
- read_unlock(&head->lock);
- goto out;
- }
- }
- for (tw = (struct tcp_tw_bucket *)tcp_ehash[i +
- tcp_ehash_size].chain;
- tw;
- tw = (struct tcp_tw_bucket *)tw->next, num++) {
- if (!TCP_INET_FAMILY(tw->family))
- continue;
- pos += TMPSZ;
- if (pos <= offset)
- continue;
- get_timewait_sock(tw, tmpbuf, num);
- len += sprintf(buffer + len, "%-*s\n",
- TMPSZ - 1, tmpbuf);
- if (pos >= offset + length) {
- read_unlock(&head->lock);
- goto out;
- }
- }
- read_unlock(&head->lock);
- }
+int __init tcp_proc_init(void)
+{
+ int rc = 0;
+ struct proc_dir_entry *p = create_proc_entry("tcp", S_IRUGO, proc_net);

-out:
- local_bh_enable();
-out_no_bh:
+ if (p)
+ p->proc_fops = &tcp_seq_fops;
+ else
+ rc = -ENOMEM;
+ return rc;
+}

- begin = len - (pos - offset);
- *start = buffer + begin;
- len -= begin;
- if (len > length)
- len = length;
- if (len < 0)
- len = 0;
- return len;
+void __init tcp_proc_exit(void)
+{
+ remove_proc_entry("tcp", proc_net);
}
+#endif /* CONFIG_PROC_FS */

struct proto tcp_prot = {
.name = "TCP",

===================================================================

This BitKeeper patch contains the following changesets:
1.859
## Wrapped with gzip_uu ##

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