int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr) { int err; u32 addr = imr->imr_multiaddr.s_addr; struct ip_mc_socklist *iml, *i; struct in_device *in_dev; int count = 0; if (!MULTICAST(addr)) return -EINVAL; rtnl_shlock(); if (!imr->imr_ifindex) in_dev = ip_mc_find_dev(imr); else { in_dev = inetdev_by_index(imr->imr_ifindex); if (in_dev) __in_dev_put(in_dev); } if (!in_dev) { iml = NULL; err = -ENODEV; goto done; } iml = (struct ip_mc_socklist *)sock_kmalloc(sk, sizeof(*iml), GFP_KERNEL); err = -EADDRINUSE; for (i=sk->protinfo.af_inet.mc_list; i; i=i->next) { if (memcmp(&i->multi, imr, sizeof(*imr)) == 0) { /* New style additions are reference counted */ if (imr->imr_address.s_addr == 0) { i->count++; err = 0; } goto done; } count++; } err = -ENOBUFS; if (iml == NULL || count >= sysctl_igmp_max_memberships) goto done; memcpy(&iml->multi, imr, sizeof(*imr)); iml->next = sk->protinfo.af_inet.mc_list; iml->count = 1; sk->protinfo.af_inet.mc_list = iml; ip_mc_inc_group(in_dev, addr); iml = NULL; err = 0; done: rtnl_shunlock(); if (iml) sock_kfree_s(sk, iml, sizeof(*iml)); return err; }
void rtnl_unlock(void) { rtnl_shunlock(); netdev_run_todo(); }
void rtnl_unlock(void) { rtnl_exunlock(); rtnl_shunlock(); }