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![Pravin Shedge](/assets/img/avatar_default.png)
These duplicate includes have been found with scripts/checkincludes.pl but they have been removed manually to avoid removing false positives. Signed-off-by: Pravin Shedge <pravin.shedge4linux@gmail.com> Acked-by: Pablo Neira Ayuso <pablo@netfilter.org> Signed-off-by: David S. Miller <davem@davemloft.net>
306 lines
6.8 KiB
C
306 lines
6.8 KiB
C
/*
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* net/core/netprio_cgroup.c Priority Control Group
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Authors: Neil Horman <nhorman@tuxdriver.com>
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/skbuff.h>
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#include <linux/cgroup.h>
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#include <linux/rcupdate.h>
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#include <linux/atomic.h>
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#include <linux/sched/task.h>
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#include <net/rtnetlink.h>
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#include <net/pkt_cls.h>
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#include <net/sock.h>
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#include <net/netprio_cgroup.h>
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#include <linux/fdtable.h>
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/*
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* netprio allocates per-net_device priomap array which is indexed by
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* css->id. Limiting css ID to 16bits doesn't lose anything.
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*/
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#define NETPRIO_ID_MAX USHRT_MAX
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#define PRIOMAP_MIN_SZ 128
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/*
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* Extend @dev->priomap so that it's large enough to accommodate
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* @target_idx. @dev->priomap.priomap_len > @target_idx after successful
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* return. Must be called under rtnl lock.
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*/
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static int extend_netdev_table(struct net_device *dev, u32 target_idx)
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{
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struct netprio_map *old, *new;
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size_t new_sz, new_len;
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/* is the existing priomap large enough? */
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old = rtnl_dereference(dev->priomap);
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if (old && old->priomap_len > target_idx)
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return 0;
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/*
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* Determine the new size. Let's keep it power-of-two. We start
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* from PRIOMAP_MIN_SZ and double it until it's large enough to
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* accommodate @target_idx.
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*/
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new_sz = PRIOMAP_MIN_SZ;
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while (true) {
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new_len = (new_sz - offsetof(struct netprio_map, priomap)) /
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sizeof(new->priomap[0]);
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if (new_len > target_idx)
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break;
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new_sz *= 2;
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/* overflowed? */
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if (WARN_ON(new_sz < PRIOMAP_MIN_SZ))
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return -ENOSPC;
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}
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/* allocate & copy */
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new = kzalloc(new_sz, GFP_KERNEL);
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if (!new)
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return -ENOMEM;
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if (old)
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memcpy(new->priomap, old->priomap,
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old->priomap_len * sizeof(old->priomap[0]));
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new->priomap_len = new_len;
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/* install the new priomap */
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rcu_assign_pointer(dev->priomap, new);
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if (old)
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kfree_rcu(old, rcu);
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return 0;
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}
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/**
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* netprio_prio - return the effective netprio of a cgroup-net_device pair
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* @css: css part of the target pair
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* @dev: net_device part of the target pair
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*
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* Should be called under RCU read or rtnl lock.
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*/
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static u32 netprio_prio(struct cgroup_subsys_state *css, struct net_device *dev)
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{
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struct netprio_map *map = rcu_dereference_rtnl(dev->priomap);
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int id = css->cgroup->id;
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if (map && id < map->priomap_len)
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return map->priomap[id];
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return 0;
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}
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/**
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* netprio_set_prio - set netprio on a cgroup-net_device pair
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* @css: css part of the target pair
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* @dev: net_device part of the target pair
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* @prio: prio to set
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*
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* Set netprio to @prio on @css-@dev pair. Should be called under rtnl
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* lock and may fail under memory pressure for non-zero @prio.
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*/
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static int netprio_set_prio(struct cgroup_subsys_state *css,
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struct net_device *dev, u32 prio)
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{
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struct netprio_map *map;
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int id = css->cgroup->id;
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int ret;
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/* avoid extending priomap for zero writes */
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map = rtnl_dereference(dev->priomap);
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if (!prio && (!map || map->priomap_len <= id))
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return 0;
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ret = extend_netdev_table(dev, id);
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if (ret)
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return ret;
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map = rtnl_dereference(dev->priomap);
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map->priomap[id] = prio;
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return 0;
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}
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static struct cgroup_subsys_state *
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cgrp_css_alloc(struct cgroup_subsys_state *parent_css)
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{
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struct cgroup_subsys_state *css;
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css = kzalloc(sizeof(*css), GFP_KERNEL);
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if (!css)
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return ERR_PTR(-ENOMEM);
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return css;
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}
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static int cgrp_css_online(struct cgroup_subsys_state *css)
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{
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struct cgroup_subsys_state *parent_css = css->parent;
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struct net_device *dev;
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int ret = 0;
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if (css->id > NETPRIO_ID_MAX)
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return -ENOSPC;
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if (!parent_css)
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return 0;
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rtnl_lock();
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/*
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* Inherit prios from the parent. As all prios are set during
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* onlining, there is no need to clear them on offline.
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*/
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for_each_netdev(&init_net, dev) {
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u32 prio = netprio_prio(parent_css, dev);
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ret = netprio_set_prio(css, dev, prio);
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if (ret)
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break;
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}
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rtnl_unlock();
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return ret;
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}
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static void cgrp_css_free(struct cgroup_subsys_state *css)
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{
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kfree(css);
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}
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static u64 read_prioidx(struct cgroup_subsys_state *css, struct cftype *cft)
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{
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return css->cgroup->id;
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}
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static int read_priomap(struct seq_file *sf, void *v)
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{
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struct net_device *dev;
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rcu_read_lock();
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for_each_netdev_rcu(&init_net, dev)
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seq_printf(sf, "%s %u\n", dev->name,
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netprio_prio(seq_css(sf), dev));
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rcu_read_unlock();
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return 0;
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}
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static ssize_t write_priomap(struct kernfs_open_file *of,
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char *buf, size_t nbytes, loff_t off)
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{
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char devname[IFNAMSIZ + 1];
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struct net_device *dev;
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u32 prio;
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int ret;
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if (sscanf(buf, "%"__stringify(IFNAMSIZ)"s %u", devname, &prio) != 2)
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return -EINVAL;
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dev = dev_get_by_name(&init_net, devname);
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if (!dev)
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return -ENODEV;
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cgroup_sk_alloc_disable();
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rtnl_lock();
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ret = netprio_set_prio(of_css(of), dev, prio);
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rtnl_unlock();
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dev_put(dev);
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return ret ?: nbytes;
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}
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static int update_netprio(const void *v, struct file *file, unsigned n)
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{
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int err;
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struct socket *sock = sock_from_file(file, &err);
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if (sock) {
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spin_lock(&cgroup_sk_update_lock);
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sock_cgroup_set_prioidx(&sock->sk->sk_cgrp_data,
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(unsigned long)v);
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spin_unlock(&cgroup_sk_update_lock);
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}
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return 0;
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}
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static void net_prio_attach(struct cgroup_taskset *tset)
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{
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struct task_struct *p;
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struct cgroup_subsys_state *css;
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cgroup_taskset_for_each(p, css, tset) {
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void *v = (void *)(unsigned long)css->cgroup->id;
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task_lock(p);
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iterate_fd(p->files, 0, update_netprio, v);
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task_unlock(p);
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}
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}
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static struct cftype ss_files[] = {
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{
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.name = "prioidx",
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.read_u64 = read_prioidx,
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},
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{
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.name = "ifpriomap",
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.seq_show = read_priomap,
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.write = write_priomap,
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},
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{ } /* terminate */
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};
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struct cgroup_subsys net_prio_cgrp_subsys = {
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.css_alloc = cgrp_css_alloc,
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.css_online = cgrp_css_online,
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.css_free = cgrp_css_free,
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.attach = net_prio_attach,
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.legacy_cftypes = ss_files,
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};
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static int netprio_device_event(struct notifier_block *unused,
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unsigned long event, void *ptr)
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{
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struct net_device *dev = netdev_notifier_info_to_dev(ptr);
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struct netprio_map *old;
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/*
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* Note this is called with rtnl_lock held so we have update side
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* protection on our rcu assignments
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*/
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switch (event) {
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case NETDEV_UNREGISTER:
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old = rtnl_dereference(dev->priomap);
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RCU_INIT_POINTER(dev->priomap, NULL);
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if (old)
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kfree_rcu(old, rcu);
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break;
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}
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return NOTIFY_DONE;
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}
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static struct notifier_block netprio_device_notifier = {
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.notifier_call = netprio_device_event
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};
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static int __init init_cgroup_netprio(void)
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{
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register_netdevice_notifier(&netprio_device_notifier);
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return 0;
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}
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subsys_initcall(init_cgroup_netprio);
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MODULE_LICENSE("GPL v2");
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