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 pr_warn_once("Unexpected inet family %d\n", 28 r->sdiag_family); 29 WARN_ON_ONCE(1); 30 return ERR_PTR(-EINVAL); 31 } 32 } 33 34 /* 35 * Due to requirement of not breaking user API we can't simply 36 * rename @pad field in inet_diag_req_v2 structure, instead 37 * use helper to figure it out. 38 */ 39 40 static struct sock *raw_lookup(struct net *net, struct sock *from, 41 const struct inet_diag_req_v2 *req) 42 { 43 struct inet_diag_req_raw *r = (void *)req; 44 struct sock *sk = NULL; 45 46 if (r->sdiag_family == AF_INET) 47 sk = __raw_v4_lookup(net, from, r->sdiag_raw_protocol, 48 r->id.idiag_dst[0], 49 r->id.idiag_src[0], 50 r->id.idiag_if, 0); 51 #if IS_ENABLED(CONFIG_IPV6) 52 else 53 sk = __raw_v6_lookup(net, from, r->sdiag_raw_protocol, 54 (const struct in6_addr *)r->id.idiag_src, 55 (const struct in6_addr *)r->id.idiag_dst, 56 r->id.idiag_if, 0); 57 #endif 58 return sk; 59 } 60 61 static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r) 62 { 63 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 64 struct sock *sk = NULL, *s; 65 int slot; 66 67 if (IS_ERR(hashinfo)) 68 return ERR_CAST(hashinfo); 69 70 read_lock(&hashinfo->lock); 71 for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) { 72 sk_for_each(s, &hashinfo->ht[slot]) { 73 sk = raw_lookup(net, s, r); 74 if (sk) { 75 /* 76 * Grab it and keep until we fill 77 * diag meaage to be reported, so 78 * caller should call sock_put then. 79 * We can do that because we're keeping 80 * hashinfo->lock here. 81 */ 82 sock_hold(sk); 83 goto out_unlock; 84 } 85 } 86 } 87 out_unlock: 88 read_unlock(&hashinfo->lock); 89 90 return sk ? sk : ERR_PTR(-ENOENT); 91 } 92 93 static int raw_diag_dump_one(struct sk_buff *in_skb, 94 const struct nlmsghdr *nlh, 95 const struct inet_diag_req_v2 *r) 96 { 97 struct net *net = sock_net(in_skb->sk); 98 struct sk_buff *rep; 99 struct sock *sk; 100 int err; 101 102 sk = raw_sock_get(net, r); 103 if (IS_ERR(sk)) 104 return PTR_ERR(sk); 105 106 rep = nlmsg_new(sizeof(struct inet_diag_msg) + 107 sizeof(struct inet_diag_meminfo) + 64, 108 GFP_KERNEL); 109 if (!rep) { 110 sock_put(sk); 111 return -ENOMEM; 112 } 113 114 err = inet_sk_diag_fill(sk, NULL, rep, r, 115 sk_user_ns(NETLINK_CB(in_skb).sk), 116 NETLINK_CB(in_skb).portid, 117 nlh->nlmsg_seq, 0, nlh, 118 netlink_net_capable(in_skb, CAP_NET_ADMIN)); 119 sock_put(sk); 120 121 if (err < 0) { 122 kfree_skb(rep); 123 return err; 124 } 125 126 err = netlink_unicast(net->diag_nlsk, rep, 127 NETLINK_CB(in_skb).portid, 128 MSG_DONTWAIT); 129 if (err > 0) 130 err = 0; 131 return err; 132 } 133 134 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, 135 struct netlink_callback *cb, 136 const struct inet_diag_req_v2 *r, 137 struct nlattr *bc, bool net_admin) 138 { 139 if (!inet_diag_bc_sk(bc, sk)) 140 return 0; 141 142 return inet_sk_diag_fill(sk, NULL, skb, r, 143 sk_user_ns(NETLINK_CB(cb->skb).sk), 144 NETLINK_CB(cb->skb).portid, 145 cb->nlh->nlmsg_seq, NLM_F_MULTI, 146 cb->nlh, net_admin); 147 } 148 149 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 150 const struct inet_diag_req_v2 *r, struct nlattr *bc) 151 { 152 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 153 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 154 struct net *net = sock_net(skb->sk); 155 int num, s_num, slot, s_slot; 156 struct sock *sk = NULL; 157 158 if (IS_ERR(hashinfo)) 159 return; 160 161 s_slot = cb->args[0]; 162 num = s_num = cb->args[1]; 163 164 read_lock(&hashinfo->lock); 165 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) { 166 num = 0; 167 168 sk_for_each(sk, &hashinfo->ht[slot]) { 169 struct inet_sock *inet = inet_sk(sk); 170 171 if (!net_eq(sock_net(sk), net)) 172 continue; 173 if (num < s_num) 174 goto next; 175 if (sk->sk_family != r->sdiag_family) 176 goto next; 177 if (r->id.idiag_sport != inet->inet_sport && 178 r->id.idiag_sport) 179 goto next; 180 if (r->id.idiag_dport != inet->inet_dport && 181 r->id.idiag_dport) 182 goto next; 183 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) 184 goto out_unlock; 185 next: 186 num++; 187 } 188 } 189 190 out_unlock: 191 read_unlock(&hashinfo->lock); 192 193 cb->args[0] = slot; 194 cb->args[1] = num; 195 } 196 197 static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 198 void *info) 199 { 200 r->idiag_rqueue = sk_rmem_alloc_get(sk); 201 r->idiag_wqueue = sk_wmem_alloc_get(sk); 202 } 203 204 #ifdef CONFIG_INET_DIAG_DESTROY 205 static int raw_diag_destroy(struct sk_buff *in_skb, 206 const struct inet_diag_req_v2 *r) 207 { 208 struct net *net = sock_net(in_skb->sk); 209 struct sock *sk; 210 int err; 211 212 sk = raw_sock_get(net, r); 213 if (IS_ERR(sk)) 214 return PTR_ERR(sk); 215 err = sock_diag_destroy(sk, ECONNABORTED); 216 sock_put(sk); 217 return err; 218 } 219 #endif 220 221 static const struct inet_diag_handler raw_diag_handler = { 222 .dump = raw_diag_dump, 223 .dump_one = raw_diag_dump_one, 224 .idiag_get_info = raw_diag_get_info, 225 .idiag_type = IPPROTO_RAW, 226 .idiag_info_size = 0, 227 #ifdef CONFIG_INET_DIAG_DESTROY 228 .destroy = raw_diag_destroy, 229 #endif 230 }; 231 232 static void __always_unused __check_inet_diag_req_raw(void) 233 { 234 /* 235 * Make sure the two structures are identical, 236 * except the @pad field. 237 */ 238 #define __offset_mismatch(m1, m2) \ 239 (offsetof(struct inet_diag_req_v2, m1) != \ 240 offsetof(struct inet_diag_req_raw, m2)) 241 242 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) != 243 sizeof(struct inet_diag_req_raw)); 244 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family)); 245 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol)); 246 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext)); 247 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol)); 248 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states)); 249 BUILD_BUG_ON(__offset_mismatch(id, id)); 250 #undef __offset_mismatch 251 } 252 253 static int __init raw_diag_init(void) 254 { 255 return inet_diag_register(&raw_diag_handler); 256 } 257 258 static void __exit raw_diag_exit(void) 259 { 260 inet_diag_unregister(&raw_diag_handler); 261 } 262 263 module_init(raw_diag_init); 264 module_exit(raw_diag_exit); 265 MODULE_LICENSE("GPL"); 266 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */); 267 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */); 268