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 sk_buff *in_skb, 91 const struct nlmsghdr *nlh, 92 const struct inet_diag_req_v2 *r) 93 { 94 struct net *net = sock_net(in_skb->sk); 95 struct sk_buff *rep; 96 struct sock *sk; 97 int err; 98 99 sk = raw_sock_get(net, r); 100 if (IS_ERR(sk)) 101 return PTR_ERR(sk); 102 103 rep = nlmsg_new(sizeof(struct inet_diag_msg) + 104 sizeof(struct inet_diag_meminfo) + 64, 105 GFP_KERNEL); 106 if (!rep) { 107 sock_put(sk); 108 return -ENOMEM; 109 } 110 111 err = inet_sk_diag_fill(sk, NULL, rep, r, 112 sk_user_ns(NETLINK_CB(in_skb).sk), 113 NETLINK_CB(in_skb).portid, 114 nlh->nlmsg_seq, 0, nlh, 115 netlink_net_capable(in_skb, CAP_NET_ADMIN)); 116 sock_put(sk); 117 118 if (err < 0) { 119 kfree_skb(rep); 120 return err; 121 } 122 123 err = netlink_unicast(net->diag_nlsk, rep, 124 NETLINK_CB(in_skb).portid, 125 MSG_DONTWAIT); 126 if (err > 0) 127 err = 0; 128 return err; 129 } 130 131 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, 132 struct netlink_callback *cb, 133 const struct inet_diag_req_v2 *r, 134 struct nlattr *bc, bool net_admin) 135 { 136 if (!inet_diag_bc_sk(bc, sk)) 137 return 0; 138 139 return inet_sk_diag_fill(sk, NULL, skb, r, 140 sk_user_ns(NETLINK_CB(cb->skb).sk), 141 NETLINK_CB(cb->skb).portid, 142 cb->nlh->nlmsg_seq, NLM_F_MULTI, 143 cb->nlh, net_admin); 144 } 145 146 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 147 const struct inet_diag_req_v2 *r, struct nlattr *bc) 148 { 149 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 150 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 151 struct net *net = sock_net(skb->sk); 152 int num, s_num, slot, s_slot; 153 struct sock *sk = NULL; 154 155 if (IS_ERR(hashinfo)) 156 return; 157 158 s_slot = cb->args[0]; 159 num = s_num = cb->args[1]; 160 161 read_lock(&hashinfo->lock); 162 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) { 163 num = 0; 164 165 sk_for_each(sk, &hashinfo->ht[slot]) { 166 struct inet_sock *inet = inet_sk(sk); 167 168 if (!net_eq(sock_net(sk), net)) 169 continue; 170 if (num < s_num) 171 goto next; 172 if (sk->sk_family != r->sdiag_family) 173 goto next; 174 if (r->id.idiag_sport != inet->inet_sport && 175 r->id.idiag_sport) 176 goto next; 177 if (r->id.idiag_dport != inet->inet_dport && 178 r->id.idiag_dport) 179 goto next; 180 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) 181 goto out_unlock; 182 next: 183 num++; 184 } 185 } 186 187 out_unlock: 188 read_unlock(&hashinfo->lock); 189 190 cb->args[0] = slot; 191 cb->args[1] = num; 192 } 193 194 static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 195 void *info) 196 { 197 r->idiag_rqueue = sk_rmem_alloc_get(sk); 198 r->idiag_wqueue = sk_wmem_alloc_get(sk); 199 } 200 201 #ifdef CONFIG_INET_DIAG_DESTROY 202 static int raw_diag_destroy(struct sk_buff *in_skb, 203 const struct inet_diag_req_v2 *r) 204 { 205 struct net *net = sock_net(in_skb->sk); 206 struct sock *sk; 207 int err; 208 209 sk = raw_sock_get(net, r); 210 if (IS_ERR(sk)) 211 return PTR_ERR(sk); 212 err = sock_diag_destroy(sk, ECONNABORTED); 213 sock_put(sk); 214 return err; 215 } 216 #endif 217 218 static const struct inet_diag_handler raw_diag_handler = { 219 .dump = raw_diag_dump, 220 .dump_one = raw_diag_dump_one, 221 .idiag_get_info = raw_diag_get_info, 222 .idiag_type = IPPROTO_RAW, 223 .idiag_info_size = 0, 224 #ifdef CONFIG_INET_DIAG_DESTROY 225 .destroy = raw_diag_destroy, 226 #endif 227 }; 228 229 static void __always_unused __check_inet_diag_req_raw(void) 230 { 231 /* 232 * Make sure the two structures are identical, 233 * except the @pad field. 234 */ 235 #define __offset_mismatch(m1, m2) \ 236 (offsetof(struct inet_diag_req_v2, m1) != \ 237 offsetof(struct inet_diag_req_raw, m2)) 238 239 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) != 240 sizeof(struct inet_diag_req_raw)); 241 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family)); 242 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol)); 243 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext)); 244 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol)); 245 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states)); 246 BUILD_BUG_ON(__offset_mismatch(id, id)); 247 #undef __offset_mismatch 248 } 249 250 static int __init raw_diag_init(void) 251 { 252 return inet_diag_register(&raw_diag_handler); 253 } 254 255 static void __exit raw_diag_exit(void) 256 { 257 inet_diag_unregister(&raw_diag_handler); 258 } 259 260 module_init(raw_diag_init); 261 module_exit(raw_diag_exit); 262 MODULE_LICENSE("GPL"); 263 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */); 264 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */); 265