1#include <linux/mutex.h> 2#include <linux/socket.h> 3#include <linux/skbuff.h> 4#include <net/netlink.h> 5#include <net/net_namespace.h> 6#include <linux/module.h> 7#include <net/sock.h> 8 9#include <linux/inet_diag.h> 10#include <linux/sock_diag.h> 11 12static const struct sock_diag_handler *sock_diag_handlers[AF_MAX]; 13static int (*inet_rcv_compat)(struct sk_buff *skb, struct nlmsghdr *nlh); 14static DEFINE_MUTEX(sock_diag_table_mutex); 15 16static u64 sock_gen_cookie(struct sock *sk) 17{ 18 while (1) { 19 u64 res = atomic64_read(&sk->sk_cookie); 20 21 if (res) 22 return res; 23 res = atomic64_inc_return(&sock_net(sk)->cookie_gen); 24 atomic64_cmpxchg(&sk->sk_cookie, 0, res); 25 } 26} 27 28int sock_diag_check_cookie(struct sock *sk, const __u32 *cookie) 29{ 30 u64 res; 31 32 if (cookie[0] == INET_DIAG_NOCOOKIE && cookie[1] == INET_DIAG_NOCOOKIE) 33 return 0; 34 35 res = sock_gen_cookie(sk); 36 if ((u32)res != cookie[0] || (u32)(res >> 32) != cookie[1]) 37 return -ESTALE; 38 39 return 0; 40} 41EXPORT_SYMBOL_GPL(sock_diag_check_cookie); 42 43void sock_diag_save_cookie(struct sock *sk, __u32 *cookie) 44{ 45 u64 res = sock_gen_cookie(sk); 46 47 cookie[0] = (u32)res; 48 cookie[1] = (u32)(res >> 32); 49} 50EXPORT_SYMBOL_GPL(sock_diag_save_cookie); 51 52int sock_diag_put_meminfo(struct sock *sk, struct sk_buff *skb, int attrtype) 53{ 54 u32 mem[SK_MEMINFO_VARS]; 55 56 mem[SK_MEMINFO_RMEM_ALLOC] = sk_rmem_alloc_get(sk); 57 mem[SK_MEMINFO_RCVBUF] = sk->sk_rcvbuf; 58 mem[SK_MEMINFO_WMEM_ALLOC] = sk_wmem_alloc_get(sk); 59 mem[SK_MEMINFO_SNDBUF] = sk->sk_sndbuf; 60 mem[SK_MEMINFO_FWD_ALLOC] = sk->sk_forward_alloc; 61 mem[SK_MEMINFO_WMEM_QUEUED] = sk->sk_wmem_queued; 62 mem[SK_MEMINFO_OPTMEM] = atomic_read(&sk->sk_omem_alloc); 63 mem[SK_MEMINFO_BACKLOG] = sk->sk_backlog.len; 64 65 return nla_put(skb, attrtype, sizeof(mem), &mem); 66} 67EXPORT_SYMBOL_GPL(sock_diag_put_meminfo); 68 69int sock_diag_put_filterinfo(bool may_report_filterinfo, struct sock *sk, 70 struct sk_buff *skb, int attrtype) 71{ 72 struct sock_fprog_kern *fprog; 73 struct sk_filter *filter; 74 struct nlattr *attr; 75 unsigned int flen; 76 int err = 0; 77 78 if (!may_report_filterinfo) { 79 nla_reserve(skb, attrtype, 0); 80 return 0; 81 } 82 83 rcu_read_lock(); 84 filter = rcu_dereference(sk->sk_filter); 85 if (!filter) 86 goto out; 87 88 fprog = filter->prog->orig_prog; 89 if (!fprog) 90 goto out; 91 92 flen = bpf_classic_proglen(fprog); 93 94 attr = nla_reserve(skb, attrtype, flen); 95 if (attr == NULL) { 96 err = -EMSGSIZE; 97 goto out; 98 } 99 100 memcpy(nla_data(attr), fprog->filter, flen); 101out: 102 rcu_read_unlock(); 103 return err; 104} 105EXPORT_SYMBOL(sock_diag_put_filterinfo); 106 107void sock_diag_register_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) 108{ 109 mutex_lock(&sock_diag_table_mutex); 110 inet_rcv_compat = fn; 111 mutex_unlock(&sock_diag_table_mutex); 112} 113EXPORT_SYMBOL_GPL(sock_diag_register_inet_compat); 114 115void sock_diag_unregister_inet_compat(int (*fn)(struct sk_buff *skb, struct nlmsghdr *nlh)) 116{ 117 mutex_lock(&sock_diag_table_mutex); 118 inet_rcv_compat = NULL; 119 mutex_unlock(&sock_diag_table_mutex); 120} 121EXPORT_SYMBOL_GPL(sock_diag_unregister_inet_compat); 122 123int sock_diag_register(const struct sock_diag_handler *hndl) 124{ 125 int err = 0; 126 127 if (hndl->family >= AF_MAX) 128 return -EINVAL; 129 130 mutex_lock(&sock_diag_table_mutex); 131 if (sock_diag_handlers[hndl->family]) 132 err = -EBUSY; 133 else 134 sock_diag_handlers[hndl->family] = hndl; 135 mutex_unlock(&sock_diag_table_mutex); 136 137 return err; 138} 139EXPORT_SYMBOL_GPL(sock_diag_register); 140 141void sock_diag_unregister(const struct sock_diag_handler *hnld) 142{ 143 int family = hnld->family; 144 145 if (family >= AF_MAX) 146 return; 147 148 mutex_lock(&sock_diag_table_mutex); 149 BUG_ON(sock_diag_handlers[family] != hnld); 150 sock_diag_handlers[family] = NULL; 151 mutex_unlock(&sock_diag_table_mutex); 152} 153EXPORT_SYMBOL_GPL(sock_diag_unregister); 154 155static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 156{ 157 int err; 158 struct sock_diag_req *req = nlmsg_data(nlh); 159 const struct sock_diag_handler *hndl; 160 161 if (nlmsg_len(nlh) < sizeof(*req)) 162 return -EINVAL; 163 164 if (req->sdiag_family >= AF_MAX) 165 return -EINVAL; 166 167 if (sock_diag_handlers[req->sdiag_family] == NULL) 168 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 169 NETLINK_SOCK_DIAG, req->sdiag_family); 170 171 mutex_lock(&sock_diag_table_mutex); 172 hndl = sock_diag_handlers[req->sdiag_family]; 173 if (hndl == NULL) 174 err = -ENOENT; 175 else 176 err = hndl->dump(skb, nlh); 177 mutex_unlock(&sock_diag_table_mutex); 178 179 return err; 180} 181 182static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 183{ 184 int ret; 185 186 switch (nlh->nlmsg_type) { 187 case TCPDIAG_GETSOCK: 188 case DCCPDIAG_GETSOCK: 189 if (inet_rcv_compat == NULL) 190 request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK, 191 NETLINK_SOCK_DIAG, AF_INET); 192 193 mutex_lock(&sock_diag_table_mutex); 194 if (inet_rcv_compat != NULL) 195 ret = inet_rcv_compat(skb, nlh); 196 else 197 ret = -EOPNOTSUPP; 198 mutex_unlock(&sock_diag_table_mutex); 199 200 return ret; 201 case SOCK_DIAG_BY_FAMILY: 202 return __sock_diag_rcv_msg(skb, nlh); 203 default: 204 return -EINVAL; 205 } 206} 207 208static DEFINE_MUTEX(sock_diag_mutex); 209 210static void sock_diag_rcv(struct sk_buff *skb) 211{ 212 mutex_lock(&sock_diag_mutex); 213 netlink_rcv_skb(skb, &sock_diag_rcv_msg); 214 mutex_unlock(&sock_diag_mutex); 215} 216 217static int __net_init diag_net_init(struct net *net) 218{ 219 struct netlink_kernel_cfg cfg = { 220 .input = sock_diag_rcv, 221 }; 222 223 net->diag_nlsk = netlink_kernel_create(net, NETLINK_SOCK_DIAG, &cfg); 224 return net->diag_nlsk == NULL ? -ENOMEM : 0; 225} 226 227static void __net_exit diag_net_exit(struct net *net) 228{ 229 netlink_kernel_release(net->diag_nlsk); 230 net->diag_nlsk = NULL; 231} 232 233static struct pernet_operations diag_net_ops = { 234 .init = diag_net_init, 235 .exit = diag_net_exit, 236}; 237 238static int __init sock_diag_init(void) 239{ 240 return register_pernet_subsys(&diag_net_ops); 241} 242 243static void __exit sock_diag_exit(void) 244{ 245 unregister_pernet_subsys(&diag_net_ops); 246} 247 248module_init(sock_diag_init); 249module_exit(sock_diag_exit); 250MODULE_LICENSE("GPL"); 251MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG); 252