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![Linus Torvalds](/assets/img/avatar_default.png)
Pull networking changes from David Miller: 1) Allow to dump, monitor, and change the bridge multicast database using netlink. From Cong Wang. 2) RFC 5961 TCP blind data injection attack mitigation, from Eric Dumazet. 3) Networking user namespace support from Eric W. Biederman. 4) tuntap/virtio-net multiqueue support by Jason Wang. 5) Support for checksum offload of encapsulated packets (basically, tunneled traffic can still be checksummed by HW). From Joseph Gasparakis. 6) Allow BPF filter access to VLAN tags, from Eric Dumazet and Daniel Borkmann. 7) Bridge port parameters over netlink and BPDU blocking support from Stephen Hemminger. 8) Improve data access patterns during inet socket demux by rearranging socket layout, from Eric Dumazet. 9) TIPC protocol updates and cleanups from Ying Xue, Paul Gortmaker, and Jon Maloy. 10) Update TCP socket hash sizing to be more in line with current day realities. The existing heurstics were choosen a decade ago. From Eric Dumazet. 11) Fix races, queue bloat, and excessive wakeups in ATM and associated drivers, from Krzysztof Mazur and David Woodhouse. 12) Support DOVE (Distributed Overlay Virtual Ethernet) extensions in VXLAN driver, from David Stevens. 13) Add "oops_only" mode to netconsole, from Amerigo Wang. 14) Support set and query of VEB/VEPA bridge mode via PF_BRIDGE, also allow DCB netlink to work on namespaces other than the initial namespace. From John Fastabend. 15) Support PTP in the Tigon3 driver, from Matt Carlson. 16) tun/vhost zero copy fixes and improvements, plus turn it on by default, from Michael S. Tsirkin. 17) Support per-association statistics in SCTP, from Michele Baldessari. And many, many, driver updates, cleanups, and improvements. Too numerous to mention individually. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next: (1722 commits) net/mlx4_en: Add support for destination MAC in steering rules net/mlx4_en: Use generic etherdevice.h functions. net: ethtool: Add destination MAC address to flow steering API bridge: add support of adding and deleting mdb entries bridge: notify mdb changes via netlink ndisc: Unexport ndisc_{build,send}_skb(). uapi: add missing netconf.h to export list pkt_sched: avoid requeues if possible solos-pci: fix double-free of TX skb in DMA mode bnx2: Fix accidental reversions. bna: Driver Version Updated to 3.1.2.1 bna: Firmware update bna: Add RX State bna: Rx Page Based Allocation bna: TX Intr Coalescing Fix bna: Tx and Rx Optimizations bna: Code Cleanup and Enhancements ath9k: check pdata variable before dereferencing it ath5k: RX timestamp is reported at end of frame ath9k_htc: RX timestamp is reported at end of frame ...
324 lines
7.1 KiB
C
324 lines
7.1 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 <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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#define PRIOMAP_MIN_SZ 128
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static inline struct cgroup_netprio_state *cgrp_netprio_state(struct cgroup *cgrp)
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{
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return container_of(cgroup_subsys_state(cgrp, net_prio_subsys_id),
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struct cgroup_netprio_state, css);
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}
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/*
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* Extend @dev->priomap so that it's large enough to accomodate
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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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pr_warn("Unable to alloc new priomap!\n");
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return -ENOMEM;
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}
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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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* @cgrp: cgroup 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 *cgrp, 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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if (map && cgrp->id < map->priomap_len)
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return map->priomap[cgrp->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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* @cgrp: cgroup 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 @cgrp-@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 *cgrp, struct net_device *dev,
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u32 prio)
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{
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struct netprio_map *map;
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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 <= cgrp->id))
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return 0;
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ret = extend_netdev_table(dev, cgrp->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[cgrp->id] = prio;
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return 0;
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}
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static struct cgroup_subsys_state *cgrp_css_alloc(struct cgroup *cgrp)
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{
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struct cgroup_netprio_state *cs;
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cs = kzalloc(sizeof(*cs), GFP_KERNEL);
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if (!cs)
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return ERR_PTR(-ENOMEM);
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return &cs->css;
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}
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static int cgrp_css_online(struct cgroup *cgrp)
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{
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struct cgroup *parent = cgrp->parent;
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struct net_device *dev;
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int ret = 0;
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if (!parent)
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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, dev);
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ret = netprio_set_prio(cgrp, 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 *cgrp)
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{
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kfree(cgrp_netprio_state(cgrp));
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}
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static u64 read_prioidx(struct cgroup *cgrp, struct cftype *cft)
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{
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return cgrp->id;
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}
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static int read_priomap(struct cgroup *cont, struct cftype *cft,
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struct cgroup_map_cb *cb)
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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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cb->fill(cb, dev->name, netprio_prio(cont, dev));
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rcu_read_unlock();
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return 0;
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}
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static int write_priomap(struct cgroup *cgrp, struct cftype *cft,
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const char *buffer)
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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(buffer, "%"__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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rtnl_lock();
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ret = netprio_set_prio(cgrp, dev, prio);
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rtnl_unlock();
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dev_put(dev);
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return ret;
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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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sock->sk->sk_cgrp_prioidx = (u32)(unsigned long)v;
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return 0;
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}
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static void net_prio_attach(struct cgroup *cgrp, struct cgroup_taskset *tset)
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{
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struct task_struct *p;
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void *v;
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cgroup_taskset_for_each(p, cgrp, tset) {
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task_lock(p);
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v = (void *)(unsigned long)task_netprioidx(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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.read_map = read_priomap,
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.write_string = write_priomap,
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},
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{ } /* terminate */
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};
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struct cgroup_subsys net_prio_subsys = {
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.name = "net_prio",
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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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.subsys_id = net_prio_subsys_id,
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.base_cftypes = ss_files,
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.module = THIS_MODULE,
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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 = 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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int ret;
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ret = cgroup_load_subsys(&net_prio_subsys);
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if (ret)
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goto out;
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register_netdevice_notifier(&netprio_device_notifier);
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out:
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return ret;
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}
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static void __exit exit_cgroup_netprio(void)
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{
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struct netprio_map *old;
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struct net_device *dev;
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unregister_netdevice_notifier(&netprio_device_notifier);
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cgroup_unload_subsys(&net_prio_subsys);
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rtnl_lock();
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for_each_netdev(&init_net, dev) {
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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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}
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rtnl_unlock();
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}
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module_init(init_cgroup_netprio);
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module_exit(exit_cgroup_netprio);
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MODULE_LICENSE("GPL v2");
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