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 struct sock *raw_lookup(struct net *net, struct sock *from, 38 const struct inet_diag_req_v2 *req) 39 { 40 struct inet_diag_req_raw *r = (void *)req; 41 struct sock *sk = NULL; 42 43 if (r->sdiag_family == AF_INET) 44 sk = __raw_v4_lookup(net, from, r->sdiag_raw_protocol, 45 r->id.idiag_dst[0], 46 r->id.idiag_src[0], 47 r->id.idiag_if, 0); 48 #if IS_ENABLED(CONFIG_IPV6) 49 else 50 sk = __raw_v6_lookup(net, from, r->sdiag_raw_protocol, 51 (const struct in6_addr *)r->id.idiag_src, 52 (const struct in6_addr *)r->id.idiag_dst, 53 r->id.idiag_if, 0); 54 #endif 55 return sk; 56 } 57 58 static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r) 59 { 60 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 61 struct sock *sk = NULL, *s; 62 int slot; 63 64 if (IS_ERR(hashinfo)) 65 return ERR_CAST(hashinfo); 66 67 read_lock(&hashinfo->lock); 68 for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) { 69 sk_for_each(s, &hashinfo->ht[slot]) { 70 sk = raw_lookup(net, s, r); 71 if (sk) { 72 /* 73 * Grab it and keep until we fill 74 * diag meaage to be reported, so 75 * caller should call sock_put then. 76 * We can do that because we're keeping 77 * hashinfo->lock here. 78 */ 79 sock_hold(sk); 80 goto out_unlock; 81 } 82 } 83 } 84 out_unlock: 85 read_unlock(&hashinfo->lock); 86 87 return sk ? sk : ERR_PTR(-ENOENT); 88 } 89 90 static int raw_diag_dump_one(struct netlink_callback *cb, 91 const struct inet_diag_req_v2 *r) 92 { 93 struct sk_buff *in_skb = cb->skb; 94 struct sk_buff *rep; 95 struct sock *sk; 96 struct net *net; 97 int err; 98 99 net = sock_net(in_skb->sk); 100 sk = raw_sock_get(net, r); 101 if (IS_ERR(sk)) 102 return PTR_ERR(sk); 103 104 rep = nlmsg_new(nla_total_size(sizeof(struct inet_diag_msg)) + 105 inet_diag_msg_attrs_size() + 106 nla_total_size(sizeof(struct inet_diag_meminfo)) + 64, 107 GFP_KERNEL); 108 if (!rep) { 109 sock_put(sk); 110 return -ENOMEM; 111 } 112 113 err = inet_sk_diag_fill(sk, NULL, rep, cb, r, 0, 114 netlink_net_capable(in_skb, CAP_NET_ADMIN)); 115 sock_put(sk); 116 117 if (err < 0) { 118 kfree_skb(rep); 119 return err; 120 } 121 122 err = netlink_unicast(net->diag_nlsk, rep, 123 NETLINK_CB(in_skb).portid, 124 MSG_DONTWAIT); 125 if (err > 0) 126 err = 0; 127 return err; 128 } 129 130 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, 131 struct netlink_callback *cb, 132 const struct inet_diag_req_v2 *r, 133 struct nlattr *bc, bool net_admin) 134 { 135 if (!inet_diag_bc_sk(bc, sk)) 136 return 0; 137 138 return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin); 139 } 140 141 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 142 const struct inet_diag_req_v2 *r) 143 { 144 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 145 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 146 struct net *net = sock_net(skb->sk); 147 struct inet_diag_dump_data *cb_data; 148 int num, s_num, slot, s_slot; 149 struct sock *sk = NULL; 150 struct nlattr *bc; 151 152 if (IS_ERR(hashinfo)) 153 return; 154 155 cb_data = cb->data; 156 bc = cb_data->inet_diag_nla_bc; 157 s_slot = cb->args[0]; 158 num = s_num = cb->args[1]; 159 160 read_lock(&hashinfo->lock); 161 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) { 162 num = 0; 163 164 sk_for_each(sk, &hashinfo->ht[slot]) { 165 struct inet_sock *inet = inet_sk(sk); 166 167 if (!net_eq(sock_net(sk), net)) 168 continue; 169 if (num < s_num) 170 goto next; 171 if (sk->sk_family != r->sdiag_family) 172 goto next; 173 if (r->id.idiag_sport != inet->inet_sport && 174 r->id.idiag_sport) 175 goto next; 176 if (r->id.idiag_dport != inet->inet_dport && 177 r->id.idiag_dport) 178 goto next; 179 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) 180 goto out_unlock; 181 next: 182 num++; 183 } 184 } 185 186 out_unlock: 187 read_unlock(&hashinfo->lock); 188 189 cb->args[0] = slot; 190 cb->args[1] = num; 191 } 192 193 static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 194 void *info) 195 { 196 r->idiag_rqueue = sk_rmem_alloc_get(sk); 197 r->idiag_wqueue = sk_wmem_alloc_get(sk); 198 } 199 200 #ifdef CONFIG_INET_DIAG_DESTROY 201 static int raw_diag_destroy(struct sk_buff *in_skb, 202 const struct inet_diag_req_v2 *r) 203 { 204 struct net *net = sock_net(in_skb->sk); 205 struct sock *sk; 206 int err; 207 208 sk = raw_sock_get(net, r); 209 if (IS_ERR(sk)) 210 return PTR_ERR(sk); 211 err = sock_diag_destroy(sk, ECONNABORTED); 212 sock_put(sk); 213 return err; 214 } 215 #endif 216 217 static const struct inet_diag_handler raw_diag_handler = { 218 .dump = raw_diag_dump, 219 .dump_one = raw_diag_dump_one, 220 .idiag_get_info = raw_diag_get_info, 221 .idiag_type = IPPROTO_RAW, 222 .idiag_info_size = 0, 223 #ifdef CONFIG_INET_DIAG_DESTROY 224 .destroy = raw_diag_destroy, 225 #endif 226 }; 227 228 static void __always_unused __check_inet_diag_req_raw(void) 229 { 230 /* 231 * Make sure the two structures are identical, 232 * except the @pad field. 233 */ 234 #define __offset_mismatch(m1, m2) \ 235 (offsetof(struct inet_diag_req_v2, m1) != \ 236 offsetof(struct inet_diag_req_raw, m2)) 237 238 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) != 239 sizeof(struct inet_diag_req_raw)); 240 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family)); 241 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol)); 242 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext)); 243 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol)); 244 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states)); 245 BUILD_BUG_ON(__offset_mismatch(id, id)); 246 #undef __offset_mismatch 247 } 248 249 static int __init raw_diag_init(void) 250 { 251 return inet_diag_register(&raw_diag_handler); 252 } 253 254 static void __exit raw_diag_exit(void) 255 { 256 inet_diag_unregister(&raw_diag_handler); 257 } 258 259 module_init(raw_diag_init); 260 module_exit(raw_diag_exit); 261 MODULE_LICENSE("GPL"); 262 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */); 263 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */); 264