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Date: Tue, 17 Apr 2018 16:11:19 +0200
From: Daniel Borkmann <daniel@...earbox.net>
To: Li RongQing <lirongqing@...du.com>
Cc: netdev@...r.kernel.org, tj@...nel.org, ast@...com, brakmo@...com
Subject: Re: [PATCH][net-next] net: ip tos cgroup
On 04/17/2018 05:36 AM, Li RongQing wrote:
> ip tos segment can be changed by setsockopt(IP_TOS), or by iptables;
> this patch creates a new method to change socket tos segment of
> processes based on cgroup
>
> The usage:
>
> 1. mount ip_tos cgroup, and setting tos value
> mount -t cgroup -o ip_tos ip_tos /cgroups/tos
> echo tos_value >/cgroups/tos/ip_tos.tos
> 2. then move processes to cgroup, or create processes in cgroup
>
> Signed-off-by: jimyan <jimyan@...du.com>
> Signed-off-by: Li RongQing <lirongqing@...du.com>
This functionality is already possible through the help of BPF programs
attached to cgroups, have you had a chance to look into that?
> include/linux/cgroup_subsys.h | 4 ++
> include/net/tos_cgroup.h | 35 ++++++++++++
> net/ipv4/Kconfig | 10 ++++
> net/ipv4/Makefile | 1 +
> net/ipv4/af_inet.c | 2 +
> net/ipv4/tos_cgroup.c | 128 ++++++++++++++++++++++++++++++++++++++++++
> net/ipv6/af_inet6.c | 2 +
> 7 files changed, 182 insertions(+)
> create mode 100644 include/net/tos_cgroup.h
> create mode 100644 net/ipv4/tos_cgroup.c
>
> diff --git a/include/linux/cgroup_subsys.h b/include/linux/cgroup_subsys.h
> index acb77dcff3b4..1b86eda1c23e 100644
> --- a/include/linux/cgroup_subsys.h
> +++ b/include/linux/cgroup_subsys.h
> @@ -61,6 +61,10 @@ SUBSYS(pids)
> SUBSYS(rdma)
> #endif
>
> +#if IS_ENABLED(CONFIG_IP_TOS_CGROUP)
> +SUBSYS(ip_tos)
> +#endif
> +
> /*
> * The following subsystems are not supported on the default hierarchy.
> */
> diff --git a/include/net/tos_cgroup.h b/include/net/tos_cgroup.h
> new file mode 100644
> index 000000000000..0868e921faf3
> --- /dev/null
> +++ b/include/net/tos_cgroup.h
> @@ -0,0 +1,35 @@
> +/* SPDX-License-Identifier: GPL-2.0 */
> +
> +#ifndef _IP_TOS_CGROUP_H
> +#define _IP_TOS_CGROUP_H
> +
> +#include <linux/cgroup.h>
> +#include <linux/hardirq.h>
> +
> +struct tos_cgroup_state {
> + struct cgroup_subsys_state css;
> + u32 tos;
> +};
> +
> +#if IS_ENABLED(CONFIG_IP_TOS_CGROUP)
> +static inline u32 task_ip_tos(struct task_struct *p)
> +{
> + u32 tos;
> +
> + if (in_interrupt())
> + return 0;
> +
> + rcu_read_lock();
> + tos = container_of(task_css(p, ip_tos_cgrp_id),
> + struct tos_cgroup_state, css)->tos;
> + rcu_read_unlock();
> +
> + return tos;
> +}
> +#else /* !CONFIG_IP_TOS_CGROUP */
> +static inline u32 task_ip_tos(struct task_struct *p)
> +{
> + return 0;
> +}
> +#endif /* CONFIG_IP_TOS_CGROUP */
> +#endif /* _IP_TOS_CGROUP_H */
> diff --git a/net/ipv4/Kconfig b/net/ipv4/Kconfig
> index 80dad301361d..57070bbb0394 100644
> --- a/net/ipv4/Kconfig
> +++ b/net/ipv4/Kconfig
> @@ -753,3 +753,13 @@ config TCP_MD5SIG
> on the Internet.
>
> If unsure, say N.
> +
> +config IP_TOS_CGROUP
> + bool "ip tos cgroup"
> + depends on CGROUPS
> + default n
> + ---help---
> + Say Y here if you want to set ip packet tos based on the
> + control cgroup of their process.
> +
> + This can set ip packet tos
> diff --git a/net/ipv4/Makefile b/net/ipv4/Makefile
> index a07b7dd06def..12c708142d1f 100644
> --- a/net/ipv4/Makefile
> +++ b/net/ipv4/Makefile
> @@ -61,6 +61,7 @@ obj-$(CONFIG_TCP_CONG_LP) += tcp_lp.o
> obj-$(CONFIG_TCP_CONG_YEAH) += tcp_yeah.o
> obj-$(CONFIG_TCP_CONG_ILLINOIS) += tcp_illinois.o
> obj-$(CONFIG_NETLABEL) += cipso_ipv4.o
> +obj-$(CONFIG_IP_TOS_CGROUP) += tos_cgroup.o
>
> obj-$(CONFIG_XFRM) += xfrm4_policy.o xfrm4_state.o xfrm4_input.o \
> xfrm4_output.o xfrm4_protocol.o
> diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
> index eaed0367e669..e2dd902b06dd 100644
> --- a/net/ipv4/af_inet.c
> +++ b/net/ipv4/af_inet.c
> @@ -120,6 +120,7 @@
> #include <linux/mroute.h>
> #endif
> #include <net/l3mdev.h>
> +#include <net/tos_cgroup.h>
>
> #include <trace/events/sock.h>
>
> @@ -356,6 +357,7 @@ static int inet_create(struct net *net, struct socket *sock, int protocol,
> inet->mc_index = 0;
> inet->mc_list = NULL;
> inet->rcv_tos = 0;
> + inet->tos = task_ip_tos(current);
>
> sk_refcnt_debug_inc(sk);
>
> diff --git a/net/ipv4/tos_cgroup.c b/net/ipv4/tos_cgroup.c
> new file mode 100644
> index 000000000000..dbb828f5b464
> --- /dev/null
> +++ b/net/ipv4/tos_cgroup.c
> @@ -0,0 +1,128 @@
> +// SPDX-License-Identifier: GPL-2.0
> +#include <linux/module.h>
> +#include <linux/types.h>
> +#include <linux/errno.h>
> +#include <linux/slab.h>
> +#include <linux/skbuff.h>
> +#include <linux/cgroup.h>
> +#include <net/sock.h>
> +#include <net/inet_sock.h>
> +#include <net/tos_cgroup.h>
> +#include <linux/fdtable.h>
> +#include <net/route.h>
> +#include <net/inet_ecn.h>
> +#include <linux/sched/task.h>
> +
> +static inline
> +struct tos_cgroup_state *css_tos_cgroup(struct cgroup_subsys_state *css)
> +{
> + return css ? container_of(css, struct tos_cgroup_state, css) : NULL;
> +}
> +
> +static inline struct tos_cgroup_state *task_tos_cgroup(struct task_struct *task)
> +{
> + return css_tos_cgroup(task_css(task, ip_tos_cgrp_id));
> +}
> +
> +static struct cgroup_subsys_state
> +*cgrp_css_alloc(struct cgroup_subsys_state *parent_css)
> +{
> + struct tos_cgroup_state *cs;
> +
> + cs = kzalloc(sizeof(*cs), GFP_KERNEL);
> + if (!cs)
> + return ERR_PTR(-ENOMEM);
> +
> + return &cs->css;
> +}
> +
> +static void cgrp_css_free(struct cgroup_subsys_state *css)
> +{
> + kfree(css_tos_cgroup(css));
> +}
> +
> +static int update_tos(const void *v, struct file *file, unsigned int n)
> +{
> + int err;
> + struct socket *sock = sock_from_file(file, &err);
> + unsigned char val = (unsigned char)*(u64 *)v;
> +
> + if (sock && (sock->sk->sk_family == PF_INET ||
> + sock->sk->sk_family == PF_INET6)) {
> + struct inet_sock *inet = inet_sk(sock->sk);
> +
> + lock_sock(sock->sk);
> + if (sock->sk->sk_type == SOCK_STREAM) {
> + val &= ~INET_ECN_MASK;
> + val |= inet->tos & INET_ECN_MASK;
> + }
> + if (inet->tos != val) {
> + inet->tos = val;
> + sock->sk->sk_priority = rt_tos2priority(val);
> + sk_dst_reset(sock->sk);
> + }
> + release_sock(sock->sk);
> + }
> + return 0;
> +}
> +
> +static void cgrp_attach(struct cgroup_taskset *tset)
> +{
> + struct task_struct *p;
> + struct cgroup_subsys_state *css;
> + u64 v;
> +
> + cgroup_taskset_for_each(p, css, tset) {
> + task_lock(p);
> + v = task_tos_cgroup(p)->tos;
> + iterate_fd(p->files, 0, update_tos, (void *)&v);
> + task_unlock(p);
> + }
> +}
> +
> +static u64 read_tos(struct cgroup_subsys_state *css, struct cftype *cft)
> +{
> + return css_tos_cgroup(css)->tos;
> +}
> +
> +static int
> +write_tos(struct cgroup_subsys_state *css, struct cftype *cft, u64 value)
> +{
> + struct css_task_iter it;
> + struct task_struct *task = NULL;
> +
> + if (value < 0 || value > 255) {
> + pr_info("Invalid TOS value\n");
> + return 0;
> + }
> +
> + css_tos_cgroup(css)->tos = (u32)value;
> +
> + css_task_iter_start(css, 0, &it);
> + while ((task = css_task_iter_next(&it))) {
> + task_lock(task);
> + iterate_fd(task->files, 0, update_tos, (void *)&value);
> + task_unlock(task);
> + }
> + css_task_iter_end(&it);
> +
> + return 0;
> +}
> +
> +static struct cftype ss_files[] = {
> + {
> + .name = "tos",
> + .read_u64 = read_tos,
> + .write_u64 = write_tos,
> + },
> + { } /* terminate */
> +};
> +
> +struct cgroup_subsys ip_tos_cgrp_subsys = {
> + .css_alloc = cgrp_css_alloc,
> + .css_free = cgrp_css_free,
> + .attach = cgrp_attach,
> + .legacy_cftypes = ss_files,
> +};
> +
> +MODULE_LICENSE("GPL v2");
> diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
> index 8da0b513f188..d33e240613e0 100644
> --- a/net/ipv6/af_inet6.c
> +++ b/net/ipv6/af_inet6.c
> @@ -44,6 +44,7 @@
> #include <linux/icmpv6.h>
> #include <linux/netfilter_ipv6.h>
>
> +#include <net/tos_cgroup.h>
> #include <net/ip.h>
> #include <net/ipv6.h>
> #include <net/udp.h>
> @@ -223,6 +224,7 @@ static int inet6_create(struct net *net, struct socket *sock, int protocol,
> inet->mc_index = 0;
> inet->mc_list = NULL;
> inet->rcv_tos = 0;
> + inet->tos = task_ip_tos(current);
>
> if (net->ipv4.sysctl_ip_no_pmtu_disc)
> inet->pmtudisc = IP_PMTUDISC_DONT;
>
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