datapath/linux-2.6/compat-2.6/genetlink.inc

   1 /* -*- c -*- */
   2
   3 #include <net/genetlink.h>
   4 #include <linux/version.h>
   5
   6 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,23)
   7 #include <linux/mutex.h>
   8
   9 static DEFINE_MUTEX(mc_group_mutex);
  10
  11 int genl_register_mc_group(struct genl_family *family,
  12                            struct genl_multicast_group *grp)
  13 {
  14         static int next_group = GENL_FIRST_MCGROUP;
  15
  16         mutex_lock(&mc_group_mutex);
  17         grp->id = next_group;
  18         grp->family = family;
  19
  20         if (++next_group > GENL_LAST_MCGROUP)
  21                 next_group = GENL_FIRST_MCGROUP;
  22         mutex_unlock(&mc_group_mutex);
  23
  24         return 0;
  25 }
  26 #endif /* kernel < 2.6.23 */
  27
  28 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,31)
  29 /**
  30  * genl_register_family_with_ops - register a generic netlink family
  31  * @family: generic netlink family
  32  * @ops: operations to be registered
  33  * @n_ops: number of elements to register
  34  *
  35  * Registers the specified family and operations from the specified table.
  36  * Only one family may be registered with the same family name or identifier.
  37  *
  38  * The family id may equal GENL_ID_GENERATE causing an unique id to
  39  * be automatically generated and assigned.
  40  *
  41  * Either a doit or dumpit callback must be specified for every registered
  42  * operation or the function will fail. Only one operation structure per
  43  * command identifier may be registered.
  44  *
  45  * See include/net/genetlink.h for more documenation on the operations
  46  * structure.
  47  *
  48  * This is equivalent to calling genl_register_family() followed by
  49  * genl_register_ops() for every operation entry in the table taking
  50  * care to unregister the family on error path.
  51  *
  52  * Return 0 on success or a negative error code.
  53  */
  54 int genl_register_family_with_ops(struct genl_family *family,
  55         struct genl_ops *ops, size_t n_ops)
  56 {
  57         int err, i;
  58
  59         err = genl_register_family(family);
  60         if (err)
  61                 return err;
  62
  63         for (i = 0; i < n_ops; ++i, ++ops) {
  64                 err = genl_register_ops(family, ops);
  65                 if (err)
  66                         goto err_out;
  67         }
  68         return 0;
  69 err_out:
  70         genl_unregister_family(family);
  71         return err;
  72 }
  73 #endif
  74
  75 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,19)
  76 /**
  77  * nlmsg_notify - send a notification netlink message
  78  * @sk: netlink socket to use
  79  * @skb: notification message
  80  * @pid: destination netlink pid for reports or 0
  81  * @group: destination multicast group or 0
  82  * @report: 1 to report back, 0 to disable
  83  * @flags: allocation flags
  84  */
  85 int nlmsg_notify(struct sock *sk, struct sk_buff *skb, u32 pid,
  86                  unsigned int group, int report, gfp_t flags)
  87 {
  88         int err = 0;
  89
  90         if (group) {
  91                 int exclude_pid = 0;
  92
  93                 if (report) {
  94                         atomic_inc(&skb->users);
  95                         exclude_pid = pid;
  96                 }
  97
  98                 /* errors reported via destination sk->sk_err, but propagate
  99                  * delivery errors if NETLINK_BROADCAST_ERROR flag is set */
 100                 err = nlmsg_multicast(sk, skb, exclude_pid, group, flags);
 101         }
 102
 103         if (report) {
 104                 int err2;
 105
 106                 err2 = nlmsg_unicast(sk, skb, pid);
 107                 if (!err || err == -ESRCH)
 108                         err = err2;
 109         }
 110
 111         return err;
 112 }
 113 #endif
 114
 115 /* This is analogous to rtnl_notify() but uses genl_sock instead of rtnl.
 116  *
 117  * This is not (yet) in any upstream kernel. */
 118 void genl_notify(struct sk_buff *skb, struct net *net, u32 pid, u32 group,
 119                  struct nlmsghdr *nlh, gfp_t flags)
 120 {
 121 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,32)
 122         struct sock *sk = net->genl_sock;
 123 #else
 124         struct sock *sk = genl_sock;
 125 #endif
 126         int report = 0;
 127
 128         if (nlh)
 129                 report = nlmsg_report(nlh);
 130
 131         nlmsg_notify(sk, skb, pid, group, report, flags);
 132 }
 133
 134 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,30)
 135 /* This function wasn't exported before 2.6.30.  Lose! */
 136 void netlink_set_err(struct sock *ssk, u32 pid, u32 group, int code)
 137 {
 138 }
 139 #endif