diff options
Diffstat (limited to 'kernel/net/core/sysctl_net_core.c')
| -rw-r--r-- | kernel/net/core/sysctl_net_core.c | 464 |
1 files changed, 464 insertions, 0 deletions
diff --git a/kernel/net/core/sysctl_net_core.c b/kernel/net/core/sysctl_net_core.c new file mode 100644 index 000000000..95b6139d7 --- /dev/null +++ b/kernel/net/core/sysctl_net_core.c @@ -0,0 +1,464 @@ +/* -*- linux-c -*- + * sysctl_net_core.c: sysctl interface to net core subsystem. + * + * Begun April 1, 1996, Mike Shaver. + * Added /proc/sys/net/core directory entry (empty =) ). [MS] + */ + +#include <linux/mm.h> +#include <linux/sysctl.h> +#include <linux/module.h> +#include <linux/socket.h> +#include <linux/netdevice.h> +#include <linux/ratelimit.h> +#include <linux/vmalloc.h> +#include <linux/init.h> +#include <linux/slab.h> +#include <linux/kmemleak.h> + +#include <net/ip.h> +#include <net/sock.h> +#include <net/net_ratelimit.h> +#include <net/busy_poll.h> +#include <net/pkt_sched.h> + +static int zero = 0; +static int one = 1; +static int min_sndbuf = SOCK_MIN_SNDBUF; +static int min_rcvbuf = SOCK_MIN_RCVBUF; + +static int net_msg_warn; /* Unused, but still a sysctl */ + +#ifdef CONFIG_RPS +static int rps_sock_flow_sysctl(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + unsigned int orig_size, size; + int ret, i; + struct ctl_table tmp = { + .data = &size, + .maxlen = sizeof(size), + .mode = table->mode + }; + struct rps_sock_flow_table *orig_sock_table, *sock_table; + static DEFINE_MUTEX(sock_flow_mutex); + + mutex_lock(&sock_flow_mutex); + + orig_sock_table = rcu_dereference_protected(rps_sock_flow_table, + lockdep_is_held(&sock_flow_mutex)); + size = orig_size = orig_sock_table ? orig_sock_table->mask + 1 : 0; + + ret = proc_dointvec(&tmp, write, buffer, lenp, ppos); + + if (write) { + if (size) { + if (size > 1<<29) { + /* Enforce limit to prevent overflow */ + mutex_unlock(&sock_flow_mutex); + return -EINVAL; + } + size = roundup_pow_of_two(size); + if (size != orig_size) { + sock_table = + vmalloc(RPS_SOCK_FLOW_TABLE_SIZE(size)); + if (!sock_table) { + mutex_unlock(&sock_flow_mutex); + return -ENOMEM; + } + rps_cpu_mask = roundup_pow_of_two(nr_cpu_ids) - 1; + sock_table->mask = size - 1; + } else + sock_table = orig_sock_table; + + for (i = 0; i < size; i++) + sock_table->ents[i] = RPS_NO_CPU; + } else + sock_table = NULL; + + if (sock_table != orig_sock_table) { + rcu_assign_pointer(rps_sock_flow_table, sock_table); + if (sock_table) + static_key_slow_inc(&rps_needed); + if (orig_sock_table) { + static_key_slow_dec(&rps_needed); + synchronize_rcu(); + vfree(orig_sock_table); + } + } + } + + mutex_unlock(&sock_flow_mutex); + + return ret; +} +#endif /* CONFIG_RPS */ + +#ifdef CONFIG_NET_FLOW_LIMIT +static DEFINE_MUTEX(flow_limit_update_mutex); + +static int flow_limit_cpu_sysctl(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, + loff_t *ppos) +{ + struct sd_flow_limit *cur; + struct softnet_data *sd; + cpumask_var_t mask; + int i, len, ret = 0; + + if (!alloc_cpumask_var(&mask, GFP_KERNEL)) + return -ENOMEM; + + if (write) { + ret = cpumask_parse_user(buffer, *lenp, mask); + if (ret) + goto done; + + mutex_lock(&flow_limit_update_mutex); + len = sizeof(*cur) + netdev_flow_limit_table_len; + for_each_possible_cpu(i) { + sd = &per_cpu(softnet_data, i); + cur = rcu_dereference_protected(sd->flow_limit, + lockdep_is_held(&flow_limit_update_mutex)); + if (cur && !cpumask_test_cpu(i, mask)) { + RCU_INIT_POINTER(sd->flow_limit, NULL); + synchronize_rcu(); + kfree(cur); + } else if (!cur && cpumask_test_cpu(i, mask)) { + cur = kzalloc_node(len, GFP_KERNEL, + cpu_to_node(i)); + if (!cur) { + /* not unwinding previous changes */ + ret = -ENOMEM; + goto write_unlock; + } + cur->num_buckets = netdev_flow_limit_table_len; + rcu_assign_pointer(sd->flow_limit, cur); + } + } +write_unlock: + mutex_unlock(&flow_limit_update_mutex); + } else { + char kbuf[128]; + + if (*ppos || !*lenp) { + *lenp = 0; + goto done; + } + + cpumask_clear(mask); + rcu_read_lock(); + for_each_possible_cpu(i) { + sd = &per_cpu(softnet_data, i); + if (rcu_dereference(sd->flow_limit)) + cpumask_set_cpu(i, mask); + } + rcu_read_unlock(); + + len = min(sizeof(kbuf) - 1, *lenp); + len = scnprintf(kbuf, len, "%*pb", cpumask_pr_args(mask)); + if (!len) { + *lenp = 0; + goto done; + } + if (len < *lenp) + kbuf[len++] = '\n'; + if (copy_to_user(buffer, kbuf, len)) { + ret = -EFAULT; + goto done; + } + *lenp = len; + *ppos += len; + } + +done: + free_cpumask_var(mask); + return ret; +} + +static int flow_limit_table_len_sysctl(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, + loff_t *ppos) +{ + unsigned int old, *ptr; + int ret; + + mutex_lock(&flow_limit_update_mutex); + + ptr = table->data; + old = *ptr; + ret = proc_dointvec(table, write, buffer, lenp, ppos); + if (!ret && write && !is_power_of_2(*ptr)) { + *ptr = old; + ret = -EINVAL; + } + + mutex_unlock(&flow_limit_update_mutex); + return ret; +} +#endif /* CONFIG_NET_FLOW_LIMIT */ + +#ifdef CONFIG_NET_SCHED +static int set_default_qdisc(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + char id[IFNAMSIZ]; + struct ctl_table tbl = { + .data = id, + .maxlen = IFNAMSIZ, + }; + int ret; + + qdisc_get_default(id, IFNAMSIZ); + + ret = proc_dostring(&tbl, write, buffer, lenp, ppos); + if (write && ret == 0) + ret = qdisc_set_default(id); + return ret; +} +#endif + +static int proc_do_rss_key(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + struct ctl_table fake_table; + char buf[NETDEV_RSS_KEY_LEN * 3]; + + snprintf(buf, sizeof(buf), "%*phC", NETDEV_RSS_KEY_LEN, netdev_rss_key); + fake_table.data = buf; + fake_table.maxlen = sizeof(buf); + return proc_dostring(&fake_table, write, buffer, lenp, ppos); +} + +static struct ctl_table net_core_table[] = { +#ifdef CONFIG_NET + { + .procname = "wmem_max", + .data = &sysctl_wmem_max, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_sndbuf, + }, + { + .procname = "rmem_max", + .data = &sysctl_rmem_max, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_rcvbuf, + }, + { + .procname = "wmem_default", + .data = &sysctl_wmem_default, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_sndbuf, + }, + { + .procname = "rmem_default", + .data = &sysctl_rmem_default, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &min_rcvbuf, + }, + { + .procname = "dev_weight", + .data = &weight_p, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "netdev_max_backlog", + .data = &netdev_max_backlog, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "netdev_rss_key", + .data = &netdev_rss_key, + .maxlen = sizeof(int), + .mode = 0444, + .proc_handler = proc_do_rss_key, + }, +#ifdef CONFIG_BPF_JIT + { + .procname = "bpf_jit_enable", + .data = &bpf_jit_enable, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, +#endif + { + .procname = "netdev_tstamp_prequeue", + .data = &netdev_tstamp_prequeue, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "message_cost", + .data = &net_ratelimit_state.interval, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_jiffies, + }, + { + .procname = "message_burst", + .data = &net_ratelimit_state.burst, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec, + }, + { + .procname = "optmem_max", + .data = &sysctl_optmem_max, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "tstamp_allow_data", + .data = &sysctl_tstamp_allow_data, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &zero, + .extra2 = &one + }, +#ifdef CONFIG_RPS + { + .procname = "rps_sock_flow_entries", + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = rps_sock_flow_sysctl + }, +#endif +#ifdef CONFIG_NET_FLOW_LIMIT + { + .procname = "flow_limit_cpu_bitmap", + .mode = 0644, + .proc_handler = flow_limit_cpu_sysctl + }, + { + .procname = "flow_limit_table_len", + .data = &netdev_flow_limit_table_len, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = flow_limit_table_len_sysctl + }, +#endif /* CONFIG_NET_FLOW_LIMIT */ +#ifdef CONFIG_NET_RX_BUSY_POLL + { + .procname = "busy_poll", + .data = &sysctl_net_busy_poll, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "busy_read", + .data = &sysctl_net_busy_read, + .maxlen = sizeof(unsigned int), + .mode = 0644, + .proc_handler = proc_dointvec + }, +#endif +#ifdef CONFIG_NET_SCHED + { + .procname = "default_qdisc", + .mode = 0644, + .maxlen = IFNAMSIZ, + .proc_handler = set_default_qdisc + }, +#endif +#endif /* CONFIG_NET */ + { + .procname = "netdev_budget", + .data = &netdev_budget, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { + .procname = "warnings", + .data = &net_msg_warn, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec + }, + { } +}; + +static struct ctl_table netns_core_table[] = { + { + .procname = "somaxconn", + .data = &init_net.core.sysctl_somaxconn, + .maxlen = sizeof(int), + .mode = 0644, + .extra1 = &zero, + .proc_handler = proc_dointvec_minmax + }, + { } +}; + +static __net_init int sysctl_core_net_init(struct net *net) +{ + struct ctl_table *tbl; + + net->core.sysctl_somaxconn = SOMAXCONN; + + tbl = netns_core_table; + if (!net_eq(net, &init_net)) { + tbl = kmemdup(tbl, sizeof(netns_core_table), GFP_KERNEL); + if (tbl == NULL) + goto err_dup; + + tbl[0].data = &net->core.sysctl_somaxconn; + + /* Don't export any sysctls to unprivileged users */ + if (net->user_ns != &init_user_ns) { + tbl[0].procname = NULL; + } + } + + net->core.sysctl_hdr = register_net_sysctl(net, "net/core", tbl); + if (net->core.sysctl_hdr == NULL) + goto err_reg; + + return 0; + +err_reg: + if (tbl != netns_core_table) + kfree(tbl); +err_dup: + return -ENOMEM; +} + +static __net_exit void sysctl_core_net_exit(struct net *net) +{ + struct ctl_table *tbl; + + tbl = net->core.sysctl_hdr->ctl_table_arg; + unregister_net_sysctl_table(net->core.sysctl_hdr); + BUG_ON(tbl == netns_core_table); + kfree(tbl); +} + +static __net_initdata struct pernet_operations sysctl_core_ops = { + .init = sysctl_core_net_init, + .exit = sysctl_core_net_exit, +}; + +static __init int sysctl_core_init(void) +{ + register_net_sysctl(&init_net, "net/core", net_core_table); + return register_pernet_subsys(&sysctl_core_ops); +} + +fs_initcall(sysctl_core_init); |