diff options
Diffstat (limited to 'net/mptcp/pm.c')
| -rw-r--r-- | net/mptcp/pm.c | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/net/mptcp/pm.c b/net/mptcp/pm.c index 85ee999729a1..f4948a2cf9be 100644 --- a/net/mptcp/pm.c +++ b/net/mptcp/pm.c @@ -5,6 +5,8 @@ */ #define pr_fmt(fmt) "MPTCP: " fmt +#include <linux/rculist.h> +#include <linux/spinlock.h> #include "protocol.h" #include "mib.h" @@ -18,6 +20,9 @@ struct mptcp_pm_add_entry { struct mptcp_sock *sock; }; +static DEFINE_SPINLOCK(mptcp_pm_list_lock); +static LIST_HEAD(mptcp_pm_list); + /* path manager helpers */ /* if sk is ipv4 or ipv6_only allows only same-family local and remote addresses, @@ -1015,3 +1020,48 @@ void __init mptcp_pm_init(void) mptcp_pm_kernel_register(); mptcp_pm_nl_init(); } + +/* Must be called with rcu read lock held */ +struct mptcp_pm_ops *mptcp_pm_find(const char *name) +{ + struct mptcp_pm_ops *pm_ops; + + list_for_each_entry_rcu(pm_ops, &mptcp_pm_list, list) { + if (!strcmp(pm_ops->name, name)) + return pm_ops; + } + + return NULL; +} + +int mptcp_pm_validate(struct mptcp_pm_ops *pm_ops) +{ + return 0; +} + +int mptcp_pm_register(struct mptcp_pm_ops *pm_ops) +{ + int ret; + + ret = mptcp_pm_validate(pm_ops); + if (ret) + return ret; + + spin_lock(&mptcp_pm_list_lock); + if (mptcp_pm_find(pm_ops->name)) { + spin_unlock(&mptcp_pm_list_lock); + return -EEXIST; + } + list_add_tail_rcu(&pm_ops->list, &mptcp_pm_list); + spin_unlock(&mptcp_pm_list_lock); + + pr_debug("%s registered\n", pm_ops->name); + return 0; +} + +void mptcp_pm_unregister(struct mptcp_pm_ops *pm_ops) +{ + spin_lock(&mptcp_pm_list_lock); + list_del_rcu(&pm_ops->list); + spin_unlock(&mptcp_pm_list_lock); +} |