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/* -*- c -*- */
#include <net/genetlink.h>
#include <linux/version.h>
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
#include <linux/mutex.h>
#include <linux/openvswitch.h>
#include "openvswitch/datapath-compat.h"
static DEFINE_MUTEX(mc_group_mutex);
int genl_register_mc_group(struct genl_family *family,
struct genl_multicast_group *grp)
{
static int next_group = GENL_FIRST_MCGROUP;
grp->family = family;
if (!strcmp(grp->name, OVS_VPORT_MCGROUP)) {
grp->id = OVS_VPORT_MCGROUP_FALLBACK_ID;
return 0;
}
mutex_lock(&mc_group_mutex);
grp->id = next_group;
if (++next_group > GENL_LAST_MCGROUP)
next_group = GENL_FIRST_MCGROUP;
mutex_unlock(&mc_group_mutex);
return 0;
}
#endif /* kernel < 2.6.23 */
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31)
/**
* genl_register_family_with_ops - register a generic netlink family
* @family: generic netlink family
* @ops: operations to be registered
* @n_ops: number of elements to register
*
* Registers the specified family and operations from the specified table.
* Only one family may be registered with the same family name or identifier.
*
* The family id may equal GENL_ID_GENERATE causing an unique id to
* be automatically generated and assigned.
*
* Either a doit or dumpit callback must be specified for every registered
* operation or the function will fail. Only one operation structure per
* command identifier may be registered.
*
* See include/net/genetlink.h for more documenation on the operations
* structure.
*
* This is equivalent to calling genl_register_family() followed by
* genl_register_ops() for every operation entry in the table taking
* care to unregister the family on error path.
*
* Return 0 on success or a negative error code.
*/
int genl_register_family_with_ops(struct genl_family *family,
struct genl_ops *ops, size_t n_ops)
{
int err, i;
err = genl_register_family(family);
if (err)
return err;
for (i = 0; i < n_ops; ++i, ++ops) {
err = genl_register_ops(family, ops);
if (err)
goto err_out;
}
return 0;
err_out:
genl_unregister_family(family);
return err;
}
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
/**
* nlmsg_notify - send a notification netlink message
* @sk: netlink socket to use
* @skb: notification message
* @pid: destination netlink pid for reports or 0
* @group: destination multicast group or 0
* @report: 1 to report back, 0 to disable
* @flags: allocation flags
*/
int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 pid,
unsigned int group, int report, gfp_t flags)
{
int err = 0;
if (group) {
int exclude_pid = 0;
if (report) {
atomic_inc(&skb->users);
exclude_pid = pid;
}
/* errors reported via destination sk->sk_err, but propagate
* delivery errors if NETLINK_BROADCAST_ERROR flag is set */
err = nlmsg_multicast(sk, skb, exclude_pid, group, flags);
}
if (report) {
int err2;
err2 = nlmsg_unicast(sk, skb, pid);
if (!err || err == -ESRCH)
err = err2;
}
return err;
}
#endif
/* This is analogous to rtnl_notify() but uses genl_sock instead of rtnl.
*
* This is not (yet) in any upstream kernel. */
void genl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
struct nlmsghdr *nlh, gfp_t flags)
{
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
struct sock *sk = net->genl_sock;
#else
struct sock *sk = genl_sock;
#endif
int report = 0;
if (nlh)
report = nlmsg_report(nlh);
nlmsg_notify(sk, skb, pid, group, report, flags);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30)
/* This function wasn't exported before 2.6.30. Lose! */
void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code)
{
}
#endif
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