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c350637227
Variants of proc_create{,_data} that directly take a struct seq_operations
and deal with network namespaces in ->open and ->release. All callers of
proc_create + seq_open_net converted over, and seq_{open,release}_net are
removed entirely.
Signed-off-by: Christoph Hellwig <hch@lst.de>
367 lines
8.4 KiB
C
367 lines
8.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/netdevice.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <net/wext.h>
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#define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
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#define get_bucket(x) ((x) >> BUCKET_SPACE)
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#define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
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#define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
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extern struct list_head ptype_all __read_mostly;
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extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
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static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
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{
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struct net *net = seq_file_net(seq);
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struct net_device *dev;
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struct hlist_head *h;
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unsigned int count = 0, offset = get_offset(*pos);
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h = &net->dev_name_head[get_bucket(*pos)];
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hlist_for_each_entry_rcu(dev, h, name_hlist) {
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if (++count == offset)
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return dev;
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}
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return NULL;
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}
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static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
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{
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struct net_device *dev;
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unsigned int bucket;
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do {
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dev = dev_from_same_bucket(seq, pos);
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if (dev)
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return dev;
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bucket = get_bucket(*pos) + 1;
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*pos = set_bucket_offset(bucket, 1);
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} while (bucket < NETDEV_HASHENTRIES);
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return NULL;
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}
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/*
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* This is invoked by the /proc filesystem handler to display a device
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* in detail.
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*/
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static void *dev_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(RCU)
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{
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rcu_read_lock();
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if (!*pos)
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return SEQ_START_TOKEN;
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if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
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return NULL;
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return dev_from_bucket(seq, pos);
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}
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static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return dev_from_bucket(seq, pos);
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}
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static void dev_seq_stop(struct seq_file *seq, void *v)
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__releases(RCU)
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{
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rcu_read_unlock();
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}
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static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
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{
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struct rtnl_link_stats64 temp;
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const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
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seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
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"%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
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dev->name, stats->rx_bytes, stats->rx_packets,
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stats->rx_errors,
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stats->rx_dropped + stats->rx_missed_errors,
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stats->rx_fifo_errors,
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stats->rx_length_errors + stats->rx_over_errors +
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stats->rx_crc_errors + stats->rx_frame_errors,
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stats->rx_compressed, stats->multicast,
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stats->tx_bytes, stats->tx_packets,
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stats->tx_errors, stats->tx_dropped,
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stats->tx_fifo_errors, stats->collisions,
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stats->tx_carrier_errors +
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stats->tx_aborted_errors +
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stats->tx_window_errors +
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stats->tx_heartbeat_errors,
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stats->tx_compressed);
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}
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/*
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* Called from the PROCfs module. This now uses the new arbitrary sized
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* /proc/net interface to create /proc/net/dev
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*/
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static int dev_seq_show(struct seq_file *seq, void *v)
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{
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if (v == SEQ_START_TOKEN)
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seq_puts(seq, "Inter-| Receive "
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" | Transmit\n"
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" face |bytes packets errs drop fifo frame "
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"compressed multicast|bytes packets errs "
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"drop fifo colls carrier compressed\n");
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else
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dev_seq_printf_stats(seq, v);
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return 0;
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}
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static struct softnet_data *softnet_get_online(loff_t *pos)
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{
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struct softnet_data *sd = NULL;
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while (*pos < nr_cpu_ids)
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if (cpu_online(*pos)) {
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sd = &per_cpu(softnet_data, *pos);
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break;
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} else
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++*pos;
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return sd;
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}
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static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
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{
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return softnet_get_online(pos);
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}
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static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return softnet_get_online(pos);
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}
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static void softnet_seq_stop(struct seq_file *seq, void *v)
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{
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}
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static int softnet_seq_show(struct seq_file *seq, void *v)
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{
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struct softnet_data *sd = v;
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unsigned int flow_limit_count = 0;
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#ifdef CONFIG_NET_FLOW_LIMIT
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struct sd_flow_limit *fl;
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rcu_read_lock();
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fl = rcu_dereference(sd->flow_limit);
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if (fl)
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flow_limit_count = fl->count;
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rcu_read_unlock();
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#endif
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seq_printf(seq,
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"%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
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sd->processed, sd->dropped, sd->time_squeeze, 0,
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0, 0, 0, 0, /* was fastroute */
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0, /* was cpu_collision */
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sd->received_rps, flow_limit_count);
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return 0;
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}
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static const struct seq_operations dev_seq_ops = {
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.start = dev_seq_start,
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.next = dev_seq_next,
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.stop = dev_seq_stop,
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.show = dev_seq_show,
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};
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static const struct seq_operations softnet_seq_ops = {
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.start = softnet_seq_start,
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.next = softnet_seq_next,
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.stop = softnet_seq_stop,
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.show = softnet_seq_show,
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};
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static void *ptype_get_idx(loff_t pos)
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{
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struct packet_type *pt = NULL;
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loff_t i = 0;
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int t;
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list_for_each_entry_rcu(pt, &ptype_all, list) {
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if (i == pos)
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return pt;
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++i;
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}
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for (t = 0; t < PTYPE_HASH_SIZE; t++) {
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list_for_each_entry_rcu(pt, &ptype_base[t], list) {
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if (i == pos)
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return pt;
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++i;
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}
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}
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return NULL;
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}
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static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(RCU)
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{
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rcu_read_lock();
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return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
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}
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static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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struct packet_type *pt;
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struct list_head *nxt;
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int hash;
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++*pos;
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if (v == SEQ_START_TOKEN)
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return ptype_get_idx(0);
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pt = v;
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nxt = pt->list.next;
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if (pt->type == htons(ETH_P_ALL)) {
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if (nxt != &ptype_all)
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goto found;
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hash = 0;
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nxt = ptype_base[0].next;
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} else
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hash = ntohs(pt->type) & PTYPE_HASH_MASK;
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while (nxt == &ptype_base[hash]) {
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if (++hash >= PTYPE_HASH_SIZE)
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return NULL;
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nxt = ptype_base[hash].next;
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}
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found:
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return list_entry(nxt, struct packet_type, list);
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}
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static void ptype_seq_stop(struct seq_file *seq, void *v)
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__releases(RCU)
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{
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rcu_read_unlock();
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}
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static int ptype_seq_show(struct seq_file *seq, void *v)
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{
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struct packet_type *pt = v;
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if (v == SEQ_START_TOKEN)
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seq_puts(seq, "Type Device Function\n");
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else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
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if (pt->type == htons(ETH_P_ALL))
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seq_puts(seq, "ALL ");
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else
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seq_printf(seq, "%04x", ntohs(pt->type));
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seq_printf(seq, " %-8s %pf\n",
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pt->dev ? pt->dev->name : "", pt->func);
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}
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return 0;
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}
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static const struct seq_operations ptype_seq_ops = {
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.start = ptype_seq_start,
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.next = ptype_seq_next,
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.stop = ptype_seq_stop,
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.show = ptype_seq_show,
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};
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static int __net_init dev_proc_net_init(struct net *net)
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{
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int rc = -ENOMEM;
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if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
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sizeof(struct seq_net_private)))
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goto out;
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if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
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&softnet_seq_ops))
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goto out_dev;
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if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
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sizeof(struct seq_net_private)))
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goto out_softnet;
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if (wext_proc_init(net))
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goto out_ptype;
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rc = 0;
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out:
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return rc;
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out_ptype:
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remove_proc_entry("ptype", net->proc_net);
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out_softnet:
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remove_proc_entry("softnet_stat", net->proc_net);
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out_dev:
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remove_proc_entry("dev", net->proc_net);
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goto out;
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}
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static void __net_exit dev_proc_net_exit(struct net *net)
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{
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wext_proc_exit(net);
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remove_proc_entry("ptype", net->proc_net);
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remove_proc_entry("softnet_stat", net->proc_net);
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remove_proc_entry("dev", net->proc_net);
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}
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static struct pernet_operations __net_initdata dev_proc_ops = {
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.init = dev_proc_net_init,
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.exit = dev_proc_net_exit,
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};
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static int dev_mc_seq_show(struct seq_file *seq, void *v)
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{
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struct netdev_hw_addr *ha;
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struct net_device *dev = v;
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if (v == SEQ_START_TOKEN)
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return 0;
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netif_addr_lock_bh(dev);
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netdev_for_each_mc_addr(ha, dev) {
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seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
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dev->ifindex, dev->name,
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ha->refcount, ha->global_use,
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(int)dev->addr_len, ha->addr);
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}
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netif_addr_unlock_bh(dev);
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return 0;
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}
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static const struct seq_operations dev_mc_seq_ops = {
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.start = dev_seq_start,
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.next = dev_seq_next,
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.stop = dev_seq_stop,
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.show = dev_mc_seq_show,
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};
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static int __net_init dev_mc_net_init(struct net *net)
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{
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if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
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sizeof(struct seq_net_private)))
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return -ENOMEM;
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return 0;
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}
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static void __net_exit dev_mc_net_exit(struct net *net)
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{
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remove_proc_entry("dev_mcast", net->proc_net);
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}
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static struct pernet_operations __net_initdata dev_mc_net_ops = {
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.init = dev_mc_net_init,
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.exit = dev_mc_net_exit,
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};
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int __init dev_proc_init(void)
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{
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int ret = register_pernet_subsys(&dev_proc_ops);
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if (!ret)
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return register_pernet_subsys(&dev_mc_net_ops);
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return ret;
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}
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