bond_procfs.c

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#include <linux/proc_fs.h>
#include <linux/export.h>
#include <net/net_namespace.h>
#include <net/netns/generic.h>
#include "bonding.h"


static void *bond_info_seq_start(struct seq_file *seq, loff_t *pos)
    __acquires(RCU)
    __acquires(&bond->lock)
{
    struct bonding *bond = seq->private;
    loff_t off = 0;
    struct slave *slave;
    int i;

    /* make sure the bond won't be taken away */
    rcu_read_lock();
    read_lock(&bond->lock);

    if (*pos == 0)
        return SEQ_START_TOKEN;

    bond_for_each_slave(bond, slave, i) {
        if (++off == *pos)
            return slave;
    }

    return NULL;
}

static void *bond_info_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
    struct bonding *bond = seq->private;
    struct slave *slave = v;

    ++*pos;
    if (v == SEQ_START_TOKEN)
        return bond->first_slave;

    slave = slave->next;

    return (slave == bond->first_slave) ? NULL : slave;
}

static void bond_info_seq_stop(struct seq_file *seq, void *v)
    __releases(&bond->lock)
    __releases(RCU)
{
    struct bonding *bond = seq->private;

    read_unlock(&bond->lock);
    rcu_read_unlock();
}

static void bond_info_show_master(struct seq_file *seq)
{
    struct bonding *bond = seq->private;
    struct slave *curr;
    int i;

    read_lock(&bond->curr_slave_lock);
    curr = bond->curr_active_slave;
    read_unlock(&bond->curr_slave_lock);

    seq_printf(seq, "Bonding Mode: %s",
           bond_mode_name(bond->params.mode));

    if (bond->params.mode == BOND_MODE_ACTIVEBACKUP &&
        bond->params.fail_over_mac)
        seq_printf(seq, " (fail_over_mac %s)",
           fail_over_mac_tbl[bond->params.fail_over_mac].modename);

    seq_printf(seq, "\n");

    if (bond->params.mode == BOND_MODE_XOR ||
        bond->params.mode == BOND_MODE_8023AD) {
        seq_printf(seq, "Transmit Hash Policy: %s (%d)\n",
            xmit_hashtype_tbl[bond->params.xmit_policy].modename,
            bond->params.xmit_policy);
    }

    if (USES_PRIMARY(bond->params.mode)) {
        seq_printf(seq, "Primary Slave: %s",
               (bond->primary_slave) ?
               bond->primary_slave->dev->name : "None");
        if (bond->primary_slave)
            seq_printf(seq, " (primary_reselect %s)",
           pri_reselect_tbl[bond->params.primary_reselect].modename);

        seq_printf(seq, "\nCurrently Active Slave: %s\n",
               (curr) ? curr->dev->name : "None");
    }

    seq_printf(seq, "MII Status: %s\n", netif_carrier_ok(bond->dev) ?
           "up" : "down");
    seq_printf(seq, "MII Polling Interval (ms): %d\n", bond->params.miimon);
    seq_printf(seq, "Up Delay (ms): %d\n",
           bond->params.updelay * bond->params.miimon);
    seq_printf(seq, "Down Delay (ms): %d\n",
           bond->params.downdelay * bond->params.miimon);


    /* ARP information */
    if (bond->params.arp_interval > 0) {
        int printed = 0;
        seq_printf(seq, "ARP Polling Interval (ms): %d\n",
                bond->params.arp_interval);

        seq_printf(seq, "ARP IP target/s (n.n.n.n form):");

        for (i = 0; (i < BOND_MAX_ARP_TARGETS); i++) {
            if (!bond->params.arp_targets[i])
                break;
            if (printed)
                seq_printf(seq, ",");
            seq_printf(seq, " %pI4", &bond->params.arp_targets[i]);
            printed = 1;
        }
        seq_printf(seq, "\n");
    }

    if (bond->params.mode == BOND_MODE_8023AD) {
        struct ad_info ad_info;

        seq_puts(seq, "\n802.3ad info\n");
        seq_printf(seq, "LACP rate: %s\n",
               (bond->params.lacp_fast) ? "fast" : "slow");
        seq_printf(seq, "Min links: %d\n", bond->params.min_links);
        seq_printf(seq, "Aggregator selection policy (ad_select): %s\n",
               ad_select_tbl[bond->params.ad_select].modename);

        if (bond_3ad_get_active_agg_info(bond, &ad_info)) {
            seq_printf(seq, "bond %s has no active aggregator\n",
                   bond->dev->name);
        } else {
            seq_printf(seq, "Active Aggregator Info:\n");

            seq_printf(seq, "\tAggregator ID: %d\n",
                   ad_info.aggregator_id);
            seq_printf(seq, "\tNumber of ports: %d\n",
                   ad_info.ports);
            seq_printf(seq, "\tActor Key: %d\n",
                   ad_info.actor_key);
            seq_printf(seq, "\tPartner Key: %d\n",
                   ad_info.partner_key);
            seq_printf(seq, "\tPartner Mac Address: %pM\n",
                   ad_info.partner_system);
        }
    }
}

static const char *bond_slave_link_status(s8 link)
{
    static const char * const status[] = {
        [BOND_LINK_UP] = "up",
        [BOND_LINK_FAIL] = "going down",
        [BOND_LINK_DOWN] = "down",
        [BOND_LINK_BACK] = "going back",
    };

    return status[link];
}

static void bond_info_show_slave(struct seq_file *seq,
                 const struct slave *slave)
{
    struct bonding *bond = seq->private;

    seq_printf(seq, "\nSlave Interface: %s\n", slave->dev->name);
    seq_printf(seq, "MII Status: %s\n", bond_slave_link_status(slave->link));
    if (slave->speed == SPEED_UNKNOWN)
        seq_printf(seq, "Speed: %s\n", "Unknown");
    else
        seq_printf(seq, "Speed: %d Mbps\n", slave->speed);

    if (slave->duplex == DUPLEX_UNKNOWN)
        seq_printf(seq, "Duplex: %s\n", "Unknown");
    else
        seq_printf(seq, "Duplex: %s\n", slave->duplex ? "full" : "half");

    seq_printf(seq, "Link Failure Count: %u\n",
           slave->link_failure_count);

    seq_printf(seq, "Permanent HW addr: %pM\n", slave->perm_hwaddr);

    if (bond->params.mode == BOND_MODE_8023AD) {
        const struct aggregator *agg
            = SLAVE_AD_INFO(slave).port.aggregator;

        if (agg)
            seq_printf(seq, "Aggregator ID: %d\n",
                   agg->aggregator_identifier);
        else
            seq_puts(seq, "Aggregator ID: N/A\n");
    }
    seq_printf(seq, "Slave queue ID: %d\n", slave->queue_id);
}

static int bond_info_seq_show(struct seq_file *seq, void *v)
{
    if (v == SEQ_START_TOKEN) {
        seq_printf(seq, "%s\n", bond_version);
        bond_info_show_master(seq);
    } else
        bond_info_show_slave(seq, v);

    return 0;
}

static const struct seq_operations bond_info_seq_ops = {
    .start = bond_info_seq_start,
    .next  = bond_info_seq_next,
    .stop  = bond_info_seq_stop,
    .show  = bond_info_seq_show,
};

static int bond_info_open(struct inode *inode, struct file *file)
{
    struct seq_file *seq;
    struct proc_dir_entry *proc;
    int res;

    res = seq_open(file, &bond_info_seq_ops);
    if (!res) {
        /* recover the pointer buried in proc_dir_entry data */
        seq = file->private_data;
        proc = PDE(inode);
        seq->private = proc->data;
    }

    return res;
}

static const struct file_operations bond_info_fops = {
    .owner   = THIS_MODULE,
    .open    = bond_info_open,
    .read    = seq_read,
    .llseek  = seq_lseek,
    .release = seq_release,
};

void bond_create_proc_entry(struct bonding *bond)
{
    struct net_device *bond_dev = bond->dev;
    struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);

    if (bn->proc_dir) {
        bond->proc_entry = proc_create_data(bond_dev->name,
                            S_IRUGO, bn->proc_dir,
                            &bond_info_fops, bond);
        if (bond->proc_entry == NULL)
            pr_warning("Warning: Cannot create /proc/net/%s/%s\n",
                   DRV_NAME, bond_dev->name);
        else
            memcpy(bond->proc_file_name, bond_dev->name, IFNAMSIZ);
    }
}

void bond_remove_proc_entry(struct bonding *bond)
{
    struct net_device *bond_dev = bond->dev;
    struct bond_net *bn = net_generic(dev_net(bond_dev), bond_net_id);

    if (bn->proc_dir && bond->proc_entry) {
        remove_proc_entry(bond->proc_file_name, bn->proc_dir);
        memset(bond->proc_file_name, 0, IFNAMSIZ);
        bond->proc_entry = NULL;
    }
}

/* Create the bonding directory under /proc/net, if doesn't exist yet.
 * Caller must hold rtnl_lock.
 */
void __net_init bond_create_proc_dir(struct bond_net *bn)
{
    if (!bn->proc_dir) {
        bn->proc_dir = proc_mkdir(DRV_NAME, bn->net->proc_net);
        if (!bn->proc_dir)
            pr_warning("Warning: cannot create /proc/net/%s\n",
                   DRV_NAME);
    }
}

/* Destroy the bonding directory under /proc/net, if empty.
 * Caller must hold rtnl_lock.
 */
void __net_exit bond_destroy_proc_dir(struct bond_net *bn)
{
    if (bn->proc_dir) {
        remove_proc_entry(DRV_NAME, bn->net->proc_net);
        bn->proc_dir = NULL;
    }
}