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129 lines
3.6 KiB
Diff
129 lines
3.6 KiB
Diff
From 75090d40ffbd9b4863238e1d62b43f8598da5e5e Mon Sep 17 00:00:00 2001
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From: Robert Love <rlove@google.com>
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Date: Thu, 31 Jul 2008 11:12:44 -0400
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Subject: [PATCH 082/134] sysfs_net_ipv4: Add sysfs-based knobs for controlling TCP window size
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Add a family of knobs to /sys/kernel/ipv4 for controlling the TCP window size:
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tcp_wmem_min
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tcp_wmem_def
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tcp_wmem_max
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tcp_rmem_min
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tcp_rmem_def
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tcp_rmem_max
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This six values mirror the sysctl knobs in /proc/sys/net/ipv4/tcp_wmem and
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/proc/sys/net/ipv4/tcp_rmem.
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Sysfs, unlike sysctl, allows us to set and manage the files' permissions and
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owners.
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Signed-off-by: Robert Love <rlove@google.com>
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---
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net/ipv4/Makefile | 1 +
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net/ipv4/sysfs_net_ipv4.c | 88 +++++++++++++++++++++++++++++++++++++++++++++
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2 files changed, 89 insertions(+), 0 deletions(-)
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create mode 100644 net/ipv4/sysfs_net_ipv4.c
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--- a/net/ipv4/Makefile
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+++ b/net/ipv4/Makefile
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@@ -14,6 +14,7 @@ obj-y := route.o inetpeer.o protocol
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inet_fragment.o
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obj-$(CONFIG_SYSCTL) += sysctl_net_ipv4.o
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+obj-$(CONFIG_SYSFS) += sysfs_net_ipv4.o
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obj-$(CONFIG_IP_FIB_HASH) += fib_hash.o
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obj-$(CONFIG_IP_FIB_TRIE) += fib_trie.o
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obj-$(CONFIG_PROC_FS) += proc.o
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--- /dev/null
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+++ b/net/ipv4/sysfs_net_ipv4.c
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@@ -0,0 +1,88 @@
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+/*
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+ * net/ipv4/sysfs_net_ipv4.c
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+ *
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+ * sysfs-based networking knobs (so we can, unlike with sysctl, control perms)
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+ *
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+ * Copyright (C) 2008 Google, Inc.
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+ *
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+ * Robert Love <rlove@google.com>
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+ *
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+ * This software is licensed under the terms of the GNU General Public
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+ * License version 2, as published by the Free Software Foundation, and
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+ * may be copied, distributed, and modified under those terms.
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+ *
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+ * This program is distributed in the hope that it will be useful,
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+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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+ * GNU General Public License for more details.
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+ */
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+
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+#include <linux/kobject.h>
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+#include <linux/string.h>
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+#include <linux/sysfs.h>
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+#include <linux/init.h>
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+#include <net/tcp.h>
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+
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+#define CREATE_IPV4_FILE(_name, _var) \
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+static ssize_t _name##_show(struct kobject *kobj, \
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+ struct kobj_attribute *attr, char *buf) \
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+{ \
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+ return sprintf(buf, "%d\n", _var); \
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+} \
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+static ssize_t _name##_store(struct kobject *kobj, \
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+ struct kobj_attribute *attr, \
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+ const char *buf, size_t count) \
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+{ \
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+ int val, ret; \
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+ ret = sscanf(buf, "%d", &val); \
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+ if (ret != 1) \
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+ return -EINVAL; \
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+ if (val < 0) \
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+ return -EINVAL; \
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+ _var = val; \
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+ return count; \
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+} \
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+static struct kobj_attribute _name##_attr = \
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+ __ATTR(_name, 0644, _name##_show, _name##_store)
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+
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+CREATE_IPV4_FILE(tcp_wmem_min, sysctl_tcp_wmem[0]);
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+CREATE_IPV4_FILE(tcp_wmem_def, sysctl_tcp_wmem[1]);
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+CREATE_IPV4_FILE(tcp_wmem_max, sysctl_tcp_wmem[2]);
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+
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+CREATE_IPV4_FILE(tcp_rmem_min, sysctl_tcp_rmem[0]);
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+CREATE_IPV4_FILE(tcp_rmem_def, sysctl_tcp_rmem[1]);
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+CREATE_IPV4_FILE(tcp_rmem_max, sysctl_tcp_rmem[2]);
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+
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+static struct attribute *ipv4_attrs[] = {
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+ &tcp_wmem_min_attr.attr,
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+ &tcp_wmem_def_attr.attr,
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+ &tcp_wmem_max_attr.attr,
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+ &tcp_rmem_min_attr.attr,
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+ &tcp_rmem_def_attr.attr,
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+ &tcp_rmem_max_attr.attr,
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+ NULL
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+};
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+
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+static struct attribute_group ipv4_attr_group = {
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+ .attrs = ipv4_attrs,
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+};
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+
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+static __init int sysfs_ipv4_init(void)
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+{
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+ struct kobject *ipv4_kobject;
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+ int ret;
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+
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+ ipv4_kobject = kobject_create_and_add("ipv4", kernel_kobj);
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+ if (!ipv4_kobject)
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+ return -ENOMEM;
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+
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+ ret = sysfs_create_group(ipv4_kobject, &ipv4_attr_group);
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+ if (ret) {
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+ kobject_put(ipv4_kobject);
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+ return ret;
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+ }
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+
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+ return 0;
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+}
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+
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+subsys_initcall(sysfs_ipv4_init);
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