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Date: Mon, 23 Sep 2013 15:43:25 +0200
From: Nicolas Dichtel <nicolas.dichtel@...nd.com>
To: "Eric W. Biederman" <ebiederm@...ssion.com>
CC: David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net ipv4: Convert ipv4.ip_local_port_range to
be per netns
Le 23/09/2013 08:27, Eric W. Biederman a écrit :
>
> - Move sysctl_local_ports from a global variable into struct netns_ipv4.
> - Modify inet_get_local_port_range to take a struct net.
> - Manually expand inet_get_local_range into ipv4_local_port_range
> because I do not know the struct net.
> - Move the initialization of sysctl_local_ports into
> sysctl_net_ipv4.c:ipv4_sysctl_init_net from inet_connection_sock.c
>
> Originally-by: Samya <samya@...tter.com>
> Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
Two minor comments, please see below.
After that: Acked-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
> ---
> drivers/infiniband/core/cma.c | 2 +-
> drivers/net/vxlan.c | 2 +-
> include/net/ip.h | 7 +----
> include/net/netns/ipv4.h | 6 +++++
> net/ipv4/inet_connection_sock.c | 20 +++++---------
> net/ipv4/inet_hashtables.c | 2 +-
> net/ipv4/ping.c | 4 +--
> net/ipv4/sysctl_net_ipv4.c | 57 ++++++++++++++++++++++++++-------------
> net/ipv4/udp.c | 2 +-
> net/sctp/socket.c | 2 +-
> security/selinux/hooks.c | 3 ++-
> 11 files changed, 61 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
> index 7c0f953..9627545 100644
> --- a/drivers/infiniband/core/cma.c
> +++ b/drivers/infiniband/core/cma.c
> @@ -2302,7 +2302,7 @@ static int cma_alloc_any_port(struct idr *ps, struct rdma_id_private *id_priv)
> int low, high, remaining;
> unsigned int rover;
>
> - inet_get_local_port_range(&low, &high);
> + inet_get_local_port_range(&init_net, &low, &high);
> remaining = (high - low) + 1;
> rover = net_random() % remaining + low;
> retry:
> diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c
> index 767f7af..a105376 100644
> --- a/drivers/net/vxlan.c
> +++ b/drivers/net/vxlan.c
> @@ -1501,7 +1501,7 @@ static void vxlan_setup(struct net_device *dev)
> vxlan->age_timer.function = vxlan_cleanup;
> vxlan->age_timer.data = (unsigned long) vxlan;
>
> - inet_get_local_port_range(&low, &high);
> + inet_get_local_port_range(dev_net(net), &low, &high);
> vxlan->port_min = low;
> vxlan->port_max = high;
> vxlan->dst_port = htons(vxlan_port);
> diff --git a/include/net/ip.h b/include/net/ip.h
> index a68f838..5e46435 100644
> --- a/include/net/ip.h
> +++ b/include/net/ip.h
> @@ -195,12 +195,7 @@ static inline u64 snmp_fold_field64(void __percpu *mib[], int offt, size_t syncp
> #endif
> extern int snmp_mib_init(void __percpu *ptr[2], size_t mibsize, size_t align);
> extern void snmp_mib_free(void __percpu *ptr[2]);
> -
> -extern struct local_ports {
> - seqlock_t lock;
> - int range[2];
> -} sysctl_local_ports;
> -extern void inet_get_local_port_range(int *low, int *high);
> +extern void inet_get_local_port_range(struct net *net, int *low, int *high);
>
> extern unsigned long *sysctl_local_reserved_ports;
> static inline int inet_is_reserved_local_port(int port)
> diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
> index 2ba9de8..d685e50 100644
> --- a/include/net/netns/ipv4.h
> +++ b/include/net/netns/ipv4.h
> @@ -15,6 +15,10 @@ struct fib_rules_ops;
> struct hlist_head;
> struct fib_table;
> struct sock;
> +struct local_ports {
> + seqlock_t lock;
> + int range[2];
> +};
>
> struct netns_ipv4 {
> #ifdef CONFIG_SYSCTL
> @@ -62,6 +66,8 @@ struct netns_ipv4 {
> int sysctl_icmp_ratemask;
> int sysctl_icmp_errors_use_inbound_ifaddr;
>
> + struct local_ports sysctl_local_ports;
> +
> int sysctl_tcp_ecn;
>
> kgid_t sysctl_ping_group_range[2];
> diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
> index 6acb541..7ac7aa1 100644
> --- a/net/ipv4/inet_connection_sock.c
> +++ b/net/ipv4/inet_connection_sock.c
> @@ -29,27 +29,19 @@ const char inet_csk_timer_bug_msg[] = "inet_csk BUG: unknown timer value\n";
> EXPORT_SYMBOL(inet_csk_timer_bug_msg);
> #endif
>
> -/*
> - * This struct holds the first and last local port number.
> - */
> -struct local_ports sysctl_local_ports __read_mostly = {
> - .lock = __SEQLOCK_UNLOCKED(sysctl_local_ports.lock),
> - .range = { 32768, 61000 },
> -};
> -
> unsigned long *sysctl_local_reserved_ports;
> EXPORT_SYMBOL(sysctl_local_reserved_ports);
>
> -void inet_get_local_port_range(int *low, int *high)
> +void inet_get_local_port_range(struct net *net, int *low, int *high)
> {
> unsigned int seq;
>
> do {
> - seq = read_seqbegin(&sysctl_local_ports.lock);
> + seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock);
>
> - *low = sysctl_local_ports.range[0];
> - *high = sysctl_local_ports.range[1];
> - } while (read_seqretry(&sysctl_local_ports.lock, seq));
> + *low = net->ipv4.sysctl_local_ports.range[0];
> + *high = net->ipv4.sysctl_local_ports.range[1];
> + } while (read_seqretry(&net->ipv4.sysctl_local_ports.lock, seq));
> }
> EXPORT_SYMBOL(inet_get_local_port_range);
>
> @@ -116,7 +108,7 @@ int inet_csk_get_port(struct sock *sk, unsigned short snum)
> int remaining, rover, low, high;
>
> again:
> - inet_get_local_port_range(&low, &high);
> + inet_get_local_port_range(net, &low, &high);
> remaining = (high - low) + 1;
> smallest_rover = rover = net_random() % remaining + low;
>
> diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
> index 7bd8983..2779037 100644
> --- a/net/ipv4/inet_hashtables.c
> +++ b/net/ipv4/inet_hashtables.c
> @@ -494,7 +494,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
> u32 offset = hint + port_offset;
> struct inet_timewait_sock *tw = NULL;
>
> - inet_get_local_port_range(&low, &high);
> + inet_get_local_port_range(net, &low, &high);
> remaining = (high - low) + 1;
>
> local_bh_disable();
> diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
> index 746427c..d71ecc4 100644
> --- a/net/ipv4/ping.c
> +++ b/net/ipv4/ping.c
> @@ -237,11 +237,11 @@ static void inet_get_ping_group_range_net(struct net *net, kgid_t *low,
> unsigned int seq;
>
> do {
> - seq = read_seqbegin(&sysctl_local_ports.lock);
> + seq = read_seqbegin(&net->ipv4.sysctl_local_ports.lock);
>
> *low = data[0];
> *high = data[1];
> - } while (read_seqretry(&sysctl_local_ports.lock, seq));
> + } while (read_seqretry(&net->ipv4.sysctl_local_ports.lock, seq));
> }
>
>
> diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
> index 610e324..b91f963 100644
> --- a/net/ipv4/sysctl_net_ipv4.c
> +++ b/net/ipv4/sysctl_net_ipv4.c
> @@ -42,12 +42,12 @@ static int ip_ping_group_range_min[] = { 0, 0 };
> static int ip_ping_group_range_max[] = { GID_T_MAX, GID_T_MAX };
>
> /* Update system visible IP port range */
> -static void set_local_port_range(int range[2])
> +static void set_local_port_range(struct local_ports *ports, int range[2])
> {
> - write_seqlock(&sysctl_local_ports.lock);
> - sysctl_local_ports.range[0] = range[0];
> - sysctl_local_ports.range[1] = range[1];
> - write_sequnlock(&sysctl_local_ports.lock);
> + write_seqlock(&ports->lock);
> + ports->range[0] = range[0];
> + ports->range[1] = range[1];
> + write_sequnlock(&ports->lock);
> }
>
> /* Validate changes from /proc interface. */
> @@ -55,6 +55,9 @@ static int ipv4_local_port_range(struct ctl_table *table, int write,
> void __user *buffer,
> size_t *lenp, loff_t *ppos)
> {
> + struct local_ports *ports =
> + container_of(table->data, struct local_ports, range);
> + unsigned int seq;
> int ret;
> int range[2];
> struct ctl_table tmp = {
> @@ -65,14 +68,19 @@ static int ipv4_local_port_range(struct ctl_table *table, int write,
> .extra2 = &ip_local_port_range_max,
> };
>
> - inet_get_local_port_range(range, range + 1);
> + do {
> + seq = read_seqbegin(&ports->lock);
> + range[0] = ports->range[0];
> + range[1] = ports->range[1];
> + } while (read_seqretry(&ports->lock, seq));
> +
> ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
>
> if (write && ret == 0) {
> if (range[1] < range[0])
> ret = -EINVAL;
> else
> - set_local_port_range(range);
> + set_local_port_range(ports, range);
> }
>
> return ret;
> @@ -82,23 +90,27 @@ static int ipv4_local_port_range(struct ctl_table *table, int write,
> static void inet_get_ping_group_range_table(struct ctl_table *table, kgid_t *low, kgid_t *high)
> {
> kgid_t *data = table->data;
> + struct netns_ipv4 *ipv4 =
There is spaces here instead of tabs.
> + container_of(table->data, struct netns_ipv4, sysctl_ping_group_range);
> unsigned int seq;
> do {
> - seq = read_seqbegin(&sysctl_local_ports.lock);
> + seq = read_seqbegin(&ipv4->sysctl_local_ports.lock);
>
> *low = data[0];
> *high = data[1];
> - } while (read_seqretry(&sysctl_local_ports.lock, seq));
> + } while (read_seqretry(&ipv4->sysctl_local_ports.lock, seq));
> }
>
> /* Update system visible IP port range */
> static void set_ping_group_range(struct ctl_table *table, kgid_t low, kgid_t high)
> {
> kgid_t *data = table->data;
> - write_seqlock(&sysctl_local_ports.lock);
> + struct netns_ipv4 *ipv4 =
Same here.
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