1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/module.h> 3 4 #include <linux/inet_diag.h> 5 #include <linux/sock_diag.h> 6 7 #include <net/inet_sock.h> 8 #include <net/raw.h> 9 #include <net/rawv6.h> 10 11 #ifdef pr_fmt 12 # undef pr_fmt 13 #endif 14 15 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 16 17 static struct raw_hashinfo * 18 raw_get_hashinfo(const struct inet_diag_req_v2 *r) 19 { 20 if (r->sdiag_family == AF_INET) { 21 return &raw_v4_hashinfo; 22 #if IS_ENABLED(CONFIG_IPV6) 23 } else if (r->sdiag_family == AF_INET6) { 24 return &raw_v6_hashinfo; 25 #endif 26 } else { 27 return ERR_PTR(-EINVAL); 28 } 29 } 30 31 /* 32 * Due to requirement of not breaking user API we can't simply 33 * rename @pad field in inet_diag_req_v2 structure, instead 34 * use helper to figure it out. 35 */ 36 37 static bool raw_lookup(struct net *net, const struct sock *sk, 38 const struct inet_diag_req_v2 *req) 39 { 40 struct inet_diag_req_raw *r = (void *)req; 41 42 if (r->sdiag_family == AF_INET) 43 return raw_v4_match(net, sk, r->sdiag_raw_protocol, 44 r->id.idiag_dst[0], 45 r->id.idiag_src[0], 46 r->id.idiag_if, 0); 47 #if IS_ENABLED(CONFIG_IPV6) 48 else 49 return raw_v6_match(net, sk, r->sdiag_raw_protocol, 50 (const struct in6_addr *)r->id.idiag_src, 51 (const struct in6_addr *)r->id.idiag_dst, 52 r->id.idiag_if, 0); 53 #endif 54 return false; 55 } 56 57 static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r) 58 { 59 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 60 struct hlist_head *hlist; 61 struct sock *sk; 62 int slot; 63 64 if (IS_ERR(hashinfo)) 65 return ERR_CAST(hashinfo); 66 67 rcu_read_lock(); 68 for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) { 69 hlist = &hashinfo->ht[slot]; 70 sk_for_each_rcu(sk, hlist) { 71 if (raw_lookup(net, sk, r)) { 72 /* 73 * Grab it and keep until we fill 74 * diag message to be reported, so 75 * caller should call sock_put then. 76 */ 77 if (refcount_inc_not_zero(&sk->sk_refcnt)) 78 goto out_unlock; 79 } 80 } 81 } 82 sk = ERR_PTR(-ENOENT); 83 out_unlock: 84 rcu_read_unlock(); 85 86 return sk; 87 } 88 89 static int raw_diag_dump_one(struct netlink_callback *cb, 90 const struct inet_diag_req_v2 *r) 91 { 92 struct sk_buff *in_skb = cb->skb; 93 struct sk_buff *rep; 94 struct sock *sk; 95 struct net *net; 96 int err; 97 98 net = sock_net(in_skb->sk); 99 sk = raw_sock_get(net, r); 100 if (IS_ERR(sk)) 101 return PTR_ERR(sk); 102 103 rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) + 104 inet_diag_msg_attrs_size() + 105 nla_total_size(sizeof(struct inet_diag_meminfo)) + 64, 106 GFP_KERNEL); 107 if (!rep) { 108 sock_put(sk); 109 return -ENOMEM; 110 } 111 112 err = inet_sk_diag_fill(sk, NULL, rep, cb, r, 0, 113 netlink_net_capable(in_skb, CAP_NET_ADMIN)); 114 sock_put(sk); 115 116 if (err < 0) { 117 kfree_skb(rep); 118 return err; 119 } 120 121 err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid); 122 123 return err; 124 } 125 126 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, 127 struct netlink_callback *cb, 128 const struct inet_diag_req_v2 *r, 129 struct nlattr *bc, bool net_admin) 130 { 131 if (!inet_diag_bc_sk(bc, sk)) 132 return 0; 133 134 return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin); 135 } 136 137 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 138 const struct inet_diag_req_v2 *r) 139 { 140 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 141 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 142 struct net *net = sock_net(skb->sk); 143 struct inet_diag_dump_data *cb_data; 144 int num, s_num, slot, s_slot; 145 struct hlist_head *hlist; 146 struct sock *sk = NULL; 147 struct nlattr *bc; 148 149 if (IS_ERR(hashinfo)) 150 return; 151 152 cb_data = cb->data; 153 bc = cb_data->inet_diag_nla_bc; 154 s_slot = cb->args[0]; 155 num = s_num = cb->args[1]; 156 157 rcu_read_lock(); 158 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) { 159 num = 0; 160 161 hlist = &hashinfo->ht[slot]; 162 sk_for_each_rcu(sk, hlist) { 163 struct inet_sock *inet = inet_sk(sk); 164 165 if (!net_eq(sock_net(sk), net)) 166 continue; 167 if (num < s_num) 168 goto next; 169 if (sk->sk_family != r->sdiag_family) 170 goto next; 171 if (r->id.idiag_sport != inet->inet_sport && 172 r->id.idiag_sport) 173 goto next; 174 if (r->id.idiag_dport != inet->inet_dport && 175 r->id.idiag_dport) 176 goto next; 177 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) 178 goto out_unlock; 179 next: 180 num++; 181 } 182 } 183 184 out_unlock: 185 rcu_read_unlock(); 186 187 cb->args[0] = slot; 188 cb->args[1] = num; 189 } 190 191 static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 192 void *info) 193 { 194 r->idiag_rqueue = sk_rmem_alloc_get(sk); 195 r->idiag_wqueue = sk_wmem_alloc_get(sk); 196 } 197 198 #ifdef CONFIG_INET_DIAG_DESTROY 199 static int raw_diag_destroy(struct sk_buff *in_skb, 200 const struct inet_diag_req_v2 *r) 201 { 202 struct net *net = sock_net(in_skb->sk); 203 struct sock *sk; 204 int err; 205 206 sk = raw_sock_get(net, r); 207 if (IS_ERR(sk)) 208 return PTR_ERR(sk); 209 err = sock_diag_destroy(sk, ECONNABORTED); 210 sock_put(sk); 211 return err; 212 } 213 #endif 214 215 static const struct inet_diag_handler raw_diag_handler = { 216 .dump = raw_diag_dump, 217 .dump_one = raw_diag_dump_one, 218 .idiag_get_info = raw_diag_get_info, 219 .idiag_type = IPPROTO_RAW, 220 .idiag_info_size = 0, 221 #ifdef CONFIG_INET_DIAG_DESTROY 222 .destroy = raw_diag_destroy, 223 #endif 224 }; 225 226 static void __always_unused __check_inet_diag_req_raw(void) 227 { 228 /* 229 * Make sure the two structures are identical, 230 * except the @pad field. 231 */ 232 #define __offset_mismatch(m1, m2) \ 233 (offsetof(struct inet_diag_req_v2, m1) != \ 234 offsetof(struct inet_diag_req_raw, m2)) 235 236 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) != 237 sizeof(struct inet_diag_req_raw)); 238 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family)); 239 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol)); 240 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext)); 241 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol)); 242 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states)); 243 BUILD_BUG_ON(__offset_mismatch(id, id)); 244 #undef __offset_mismatch 245 } 246 247 static int __init raw_diag_init(void) 248 { 249 return inet_diag_register(&raw_diag_handler); 250 } 251 252 static void __exit raw_diag_exit(void) 253 { 254 inet_diag_unregister(&raw_diag_handler); 255 } 256 257 module_init(raw_diag_init); 258 module_exit(raw_diag_exit); 259 MODULE_LICENSE("GPL"); 260 MODULE_DESCRIPTION("RAW socket monitoring via SOCK_DIAG"); 261 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */); 262 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */); 263