18ef874bfSPavel Emelyanov #include <linux/mutex.h> 28ef874bfSPavel Emelyanov #include <linux/socket.h> 38ef874bfSPavel Emelyanov #include <linux/skbuff.h> 48ef874bfSPavel Emelyanov #include <net/netlink.h> 58ef874bfSPavel Emelyanov #include <net/net_namespace.h> 68ef874bfSPavel Emelyanov #include <linux/module.h> 75d2e5f27SPavel Emelyanov #include <net/sock.h> 88ef874bfSPavel Emelyanov 98ef874bfSPavel Emelyanov #include <linux/inet_diag.h> 108ef874bfSPavel Emelyanov #include <linux/sock_diag.h> 118ef874bfSPavel Emelyanov 128dcf01fcSShan Wei static const struct sock_diag_handler *sock_diag_handlers[AF_MAX]; 138ef874bfSPavel Emelyanov static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh); 148ef874bfSPavel Emelyanov static DEFINE_MUTEX(sock_diag_table_mutex); 158ef874bfSPavel Emelyanov 1633cf7c90SEric Dumazet static u64 sock_gen_cookie(struct sock *sk) 17f65c1b53SPavel Emelyanov { 1833cf7c90SEric Dumazet while (1) { 1933cf7c90SEric Dumazet u64 res = atomic64_read(&sk->sk_cookie); 2033cf7c90SEric Dumazet 2133cf7c90SEric Dumazet if (res) 2233cf7c90SEric Dumazet return res; 2333cf7c90SEric Dumazet res = atomic64_inc_return(&sock_net(sk)->cookie_gen); 2433cf7c90SEric Dumazet atomic64_cmpxchg(&sk->sk_cookie, 0, res); 2533cf7c90SEric Dumazet } 2633cf7c90SEric Dumazet } 2733cf7c90SEric Dumazet 2833cf7c90SEric Dumazet int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie) 2933cf7c90SEric Dumazet { 3033cf7c90SEric Dumazet u64 res; 3133cf7c90SEric Dumazet 3233cf7c90SEric Dumazet if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE) 3333cf7c90SEric Dumazet return 0; 3433cf7c90SEric Dumazet 3533cf7c90SEric Dumazet res = sock_gen_cookie(sk); 3633cf7c90SEric Dumazet if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1]) 37f65c1b53SPavel Emelyanov return -ESTALE; 3833cf7c90SEric Dumazet 39f65c1b53SPavel Emelyanov return 0; 40f65c1b53SPavel Emelyanov } 41f65c1b53SPavel Emelyanov EXPORT_SYMBOL_GPL(sock_diag_check_cookie); 42f65c1b53SPavel Emelyanov 4333cf7c90SEric Dumazet void sock_diag_save_cookie(struct sock *sk, __u32 *cookie) 44f65c1b53SPavel Emelyanov { 4533cf7c90SEric Dumazet u64 res = sock_gen_cookie(sk); 4633cf7c90SEric Dumazet 4733cf7c90SEric Dumazet cookie[0] = (u32)res; 4833cf7c90SEric Dumazet cookie[1] = (u32)(res >> 32); 49f65c1b53SPavel Emelyanov } 50f65c1b53SPavel Emelyanov EXPORT_SYMBOL_GPL(sock_diag_save_cookie); 51f65c1b53SPavel Emelyanov 525d2e5f27SPavel Emelyanov int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) 535d2e5f27SPavel Emelyanov { 547b46866dSThomas Graf u32 mem[SK_MEMINFO_VARS]; 555d2e5f27SPavel Emelyanov 565d2e5f27SPavel Emelyanov mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); 575d2e5f27SPavel Emelyanov mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; 585d2e5f27SPavel Emelyanov mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); 595d2e5f27SPavel Emelyanov mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; 605d2e5f27SPavel Emelyanov mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; 615d2e5f27SPavel Emelyanov mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; 625d2e5f27SPavel Emelyanov mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); 63d594e987SEric Dumazet mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; 645d2e5f27SPavel Emelyanov 657b46866dSThomas Graf return nla_put(skb, attrtype, sizeof(mem), &mem); 665d2e5f27SPavel Emelyanov } 675d2e5f27SPavel Emelyanov EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); 685d2e5f27SPavel Emelyanov 69a53b72c8SEric W. Biederman int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk, 70e8d9612cSNicolas Dichtel struct sk_buff *skb, int attrtype) 71e8d9612cSNicolas Dichtel { 72a3ea269bSDaniel Borkmann struct sock_fprog_kern *fprog; 73e8d9612cSNicolas Dichtel struct sk_filter *filter; 74a3ea269bSDaniel Borkmann struct nlattr *attr; 75a3ea269bSDaniel Borkmann unsigned int flen; 76e8d9612cSNicolas Dichtel int err = 0; 77e8d9612cSNicolas Dichtel 78a53b72c8SEric W. Biederman if (!may_report_filterinfo) { 79e8d9612cSNicolas Dichtel nla_reserve(skb, attrtype, 0); 80e8d9612cSNicolas Dichtel return 0; 81e8d9612cSNicolas Dichtel } 82e8d9612cSNicolas Dichtel 83e8d9612cSNicolas Dichtel rcu_read_lock(); 84e8d9612cSNicolas Dichtel filter = rcu_dereference(sk->sk_filter); 85a3ea269bSDaniel Borkmann if (!filter) 86a3ea269bSDaniel Borkmann goto out; 87e8d9612cSNicolas Dichtel 887ae457c1SAlexei Starovoitov fprog = filter->prog->orig_prog; 89009937e7SAlexei Starovoitov flen = bpf_classic_proglen(fprog); 90a3ea269bSDaniel Borkmann 91a3ea269bSDaniel Borkmann attr = nla_reserve(skb, attrtype, flen); 92e8d9612cSNicolas Dichtel if (attr == NULL) { 93e8d9612cSNicolas Dichtel err = -EMSGSIZE; 94e8d9612cSNicolas Dichtel goto out; 95e8d9612cSNicolas Dichtel } 96e8d9612cSNicolas Dichtel 97a3ea269bSDaniel Borkmann memcpy(nla_data(attr), fprog->filter, flen); 98e8d9612cSNicolas Dichtel out: 99e8d9612cSNicolas Dichtel rcu_read_unlock(); 100e8d9612cSNicolas Dichtel return err; 101e8d9612cSNicolas Dichtel } 102e8d9612cSNicolas Dichtel EXPORT_SYMBOL(sock_diag_put_filterinfo); 103e8d9612cSNicolas Dichtel 1048ef874bfSPavel Emelyanov void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) 1058ef874bfSPavel Emelyanov { 1068ef874bfSPavel Emelyanov mutex_lock(&sock_diag_table_mutex); 1078ef874bfSPavel Emelyanov inet_rcv_compat = fn; 1088ef874bfSPavel Emelyanov mutex_unlock(&sock_diag_table_mutex); 1098ef874bfSPavel Emelyanov } 1108ef874bfSPavel Emelyanov EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat); 1118ef874bfSPavel Emelyanov 1128ef874bfSPavel Emelyanov void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) 1138ef874bfSPavel Emelyanov { 1148ef874bfSPavel Emelyanov mutex_lock(&sock_diag_table_mutex); 1158ef874bfSPavel Emelyanov inet_rcv_compat = NULL; 1168ef874bfSPavel Emelyanov mutex_unlock(&sock_diag_table_mutex); 1178ef874bfSPavel Emelyanov } 1188ef874bfSPavel Emelyanov EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat); 1198ef874bfSPavel Emelyanov 1208dcf01fcSShan Wei int sock_diag_register(const struct sock_diag_handler *hndl) 1218ef874bfSPavel Emelyanov { 1228ef874bfSPavel Emelyanov int err = 0; 1238ef874bfSPavel Emelyanov 1246f8e4ad0SDan Carpenter if (hndl->family >= AF_MAX) 1258ef874bfSPavel Emelyanov return -EINVAL; 1268ef874bfSPavel Emelyanov 1278ef874bfSPavel Emelyanov mutex_lock(&sock_diag_table_mutex); 1288ef874bfSPavel Emelyanov if (sock_diag_handlers[hndl->family]) 1298ef874bfSPavel Emelyanov err = -EBUSY; 1308ef874bfSPavel Emelyanov else 1318ef874bfSPavel Emelyanov sock_diag_handlers[hndl->family] = hndl; 1328ef874bfSPavel Emelyanov mutex_unlock(&sock_diag_table_mutex); 1338ef874bfSPavel Emelyanov 1348ef874bfSPavel Emelyanov return err; 1358ef874bfSPavel Emelyanov } 1368ef874bfSPavel Emelyanov EXPORT_SYMBOL_GPL(sock_diag_register); 1378ef874bfSPavel Emelyanov 1388dcf01fcSShan Wei void sock_diag_unregister(const struct sock_diag_handler *hnld) 1398ef874bfSPavel Emelyanov { 1408ef874bfSPavel Emelyanov int family = hnld->family; 1418ef874bfSPavel Emelyanov 1426f8e4ad0SDan Carpenter if (family >= AF_MAX) 1438ef874bfSPavel Emelyanov return; 1448ef874bfSPavel Emelyanov 1458ef874bfSPavel Emelyanov mutex_lock(&sock_diag_table_mutex); 1468ef874bfSPavel Emelyanov BUG_ON(sock_diag_handlers[family] != hnld); 1478ef874bfSPavel Emelyanov sock_diag_handlers[family] = NULL; 1488ef874bfSPavel Emelyanov mutex_unlock(&sock_diag_table_mutex); 1498ef874bfSPavel Emelyanov } 1508ef874bfSPavel Emelyanov EXPORT_SYMBOL_GPL(sock_diag_unregister); 1518ef874bfSPavel Emelyanov 1528ef874bfSPavel Emelyanov static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1538ef874bfSPavel Emelyanov { 1548ef874bfSPavel Emelyanov int err; 1557b46866dSThomas Graf struct sock_diag_req *req = nlmsg_data(nlh); 1568dcf01fcSShan Wei const struct sock_diag_handler *hndl; 1578ef874bfSPavel Emelyanov 1588ef874bfSPavel Emelyanov if (nlmsg_len(nlh) < sizeof(*req)) 1598ef874bfSPavel Emelyanov return -EINVAL; 1608ef874bfSPavel Emelyanov 1616e601a53SMathias Krause if (req->sdiag_family >= AF_MAX) 1626e601a53SMathias Krause return -EINVAL; 1636e601a53SMathias Krause 1648e904550SMathias Krause if (sock_diag_handlers[req->sdiag_family] == NULL) 1658e904550SMathias Krause request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 1668e904550SMathias Krause NETLINK_SOCK_DIAG, req->sdiag_family); 1678e904550SMathias Krause 1688e904550SMathias Krause mutex_lock(&sock_diag_table_mutex); 1698e904550SMathias Krause hndl = sock_diag_handlers[req->sdiag_family]; 1708ef874bfSPavel Emelyanov if (hndl == NULL) 1718ef874bfSPavel Emelyanov err = -ENOENT; 1728ef874bfSPavel Emelyanov else 1738ef874bfSPavel Emelyanov err = hndl->dump(skb, nlh); 1748e904550SMathias Krause mutex_unlock(&sock_diag_table_mutex); 1758ef874bfSPavel Emelyanov 1768ef874bfSPavel Emelyanov return err; 1778ef874bfSPavel Emelyanov } 1788ef874bfSPavel Emelyanov 1798ef874bfSPavel Emelyanov static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 1808ef874bfSPavel Emelyanov { 1818ef874bfSPavel Emelyanov int ret; 1828ef874bfSPavel Emelyanov 1838ef874bfSPavel Emelyanov switch (nlh->nlmsg_type) { 1848ef874bfSPavel Emelyanov case TCPDIAG_GETSOCK: 1858ef874bfSPavel Emelyanov case DCCPDIAG_GETSOCK: 1868ef874bfSPavel Emelyanov if (inet_rcv_compat == NULL) 1878ef874bfSPavel Emelyanov request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 188aec8dc62SPavel Emelyanov NETLINK_SOCK_DIAG, AF_INET); 1898ef874bfSPavel Emelyanov 1908ef874bfSPavel Emelyanov mutex_lock(&sock_diag_table_mutex); 1918ef874bfSPavel Emelyanov if (inet_rcv_compat != NULL) 1928ef874bfSPavel Emelyanov ret = inet_rcv_compat(skb, nlh); 1938ef874bfSPavel Emelyanov else 1948ef874bfSPavel Emelyanov ret = -EOPNOTSUPP; 1958ef874bfSPavel Emelyanov mutex_unlock(&sock_diag_table_mutex); 1968ef874bfSPavel Emelyanov 1978ef874bfSPavel Emelyanov return ret; 1988ef874bfSPavel Emelyanov case SOCK_DIAG_BY_FAMILY: 1998ef874bfSPavel Emelyanov return __sock_diag_rcv_msg(skb, nlh); 2008ef874bfSPavel Emelyanov default: 2018ef874bfSPavel Emelyanov return -EINVAL; 2028ef874bfSPavel Emelyanov } 2038ef874bfSPavel Emelyanov } 2048ef874bfSPavel Emelyanov 2058ef874bfSPavel Emelyanov static DEFINE_MUTEX(sock_diag_mutex); 2068ef874bfSPavel Emelyanov 2078ef874bfSPavel Emelyanov static void sock_diag_rcv(struct sk_buff *skb) 2088ef874bfSPavel Emelyanov { 2098ef874bfSPavel Emelyanov mutex_lock(&sock_diag_mutex); 2108ef874bfSPavel Emelyanov netlink_rcv_skb(skb, &sock_diag_rcv_msg); 2118ef874bfSPavel Emelyanov mutex_unlock(&sock_diag_mutex); 2128ef874bfSPavel Emelyanov } 2138ef874bfSPavel Emelyanov 21451d7cccfSAndrey Vagin static int __net_init diag_net_init(struct net *net) 2158ef874bfSPavel Emelyanov { 216a31f2d17SPablo Neira Ayuso struct netlink_kernel_cfg cfg = { 217a31f2d17SPablo Neira Ayuso .input = sock_diag_rcv, 218a31f2d17SPablo Neira Ayuso }; 219a31f2d17SPablo Neira Ayuso 2209f00d977SPablo Neira Ayuso net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg); 22151d7cccfSAndrey Vagin return net->diag_nlsk == NULL ? -ENOMEM : 0; 22251d7cccfSAndrey Vagin } 22351d7cccfSAndrey Vagin 22451d7cccfSAndrey Vagin static void __net_exit diag_net_exit(struct net *net) 22551d7cccfSAndrey Vagin { 22651d7cccfSAndrey Vagin netlink_kernel_release(net->diag_nlsk); 22751d7cccfSAndrey Vagin net->diag_nlsk = NULL; 22851d7cccfSAndrey Vagin } 22951d7cccfSAndrey Vagin 23051d7cccfSAndrey Vagin static struct pernet_operations diag_net_ops = { 23151d7cccfSAndrey Vagin .init = diag_net_init, 23251d7cccfSAndrey Vagin .exit = diag_net_exit, 23351d7cccfSAndrey Vagin }; 23451d7cccfSAndrey Vagin 23551d7cccfSAndrey Vagin static int __init sock_diag_init(void) 23651d7cccfSAndrey Vagin { 23751d7cccfSAndrey Vagin return register_pernet_subsys(&diag_net_ops); 2388ef874bfSPavel Emelyanov } 2398ef874bfSPavel Emelyanov 2408ef874bfSPavel Emelyanov static void __exit sock_diag_exit(void) 2418ef874bfSPavel Emelyanov { 24251d7cccfSAndrey Vagin unregister_pernet_subsys(&diag_net_ops); 2438ef874bfSPavel Emelyanov } 2448ef874bfSPavel Emelyanov 2458ef874bfSPavel Emelyanov module_init(sock_diag_init); 2468ef874bfSPavel Emelyanov module_exit(sock_diag_exit); 2478ef874bfSPavel Emelyanov MODULE_LICENSE("GPL"); 2488ef874bfSPavel Emelyanov MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); 249