1 #include <linux/module.h> 2 3 #include <linux/inet_diag.h> 4 #include <linux/sock_diag.h> 5 6 #include <net/inet_sock.h> 7 #include <net/raw.h> 8 #include <net/rawv6.h> 9 10 #ifdef pr_fmt 11 # undef pr_fmt 12 #endif 13 14 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 15 16 static struct raw_hashinfo * 17 raw_get_hashinfo(const struct inet_diag_req_v2 *r) 18 { 19 if (r->sdiag_family == AF_INET) { 20 return &raw_v4_hashinfo; 21 #if IS_ENABLED(CONFIG_IPV6) 22 } else if (r->sdiag_family == AF_INET6) { 23 return &raw_v6_hashinfo; 24 #endif 25 } else { 26 pr_warn_once("Unexpected inet family %d\n", 27 r->sdiag_family); 28 WARN_ON_ONCE(1); 29 return ERR_PTR(-EINVAL); 30 } 31 } 32 33 /* 34 * Due to requirement of not breaking user API we can't simply 35 * rename @pad field in inet_diag_req_v2 structure, instead 36 * use helper to figure it out. 37 */ 38 39 static struct sock *raw_lookup(struct net *net, struct sock *from, 40 const struct inet_diag_req_v2 *req) 41 { 42 struct inet_diag_req_raw *r = (void *)req; 43 struct sock *sk = NULL; 44 45 if (r->sdiag_family == AF_INET) 46 sk = __raw_v4_lookup(net, from, r->sdiag_raw_protocol, 47 r->id.idiag_dst[0], 48 r->id.idiag_src[0], 49 r->id.idiag_if, 0); 50 #if IS_ENABLED(CONFIG_IPV6) 51 else 52 sk = __raw_v6_lookup(net, from, r->sdiag_raw_protocol, 53 (const struct in6_addr *)r->id.idiag_src, 54 (const struct in6_addr *)r->id.idiag_dst, 55 r->id.idiag_if, 0); 56 #endif 57 return sk; 58 } 59 60 static struct sock *raw_sock_get(struct net *net, const struct inet_diag_req_v2 *r) 61 { 62 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 63 struct sock *sk = NULL, *s; 64 int slot; 65 66 if (IS_ERR(hashinfo)) 67 return ERR_CAST(hashinfo); 68 69 read_lock(&hashinfo->lock); 70 for (slot = 0; slot < RAW_HTABLE_SIZE; slot++) { 71 sk_for_each(s, &hashinfo->ht[slot]) { 72 sk = raw_lookup(net, s, r); 73 if (sk) { 74 /* 75 * Grab it and keep until we fill 76 * diag meaage to be reported, so 77 * caller should call sock_put then. 78 * We can do that because we're keeping 79 * hashinfo->lock here. 80 */ 81 sock_hold(sk); 82 goto out_unlock; 83 } 84 } 85 } 86 out_unlock: 87 read_unlock(&hashinfo->lock); 88 89 return sk ? sk : ERR_PTR(-ENOENT); 90 } 91 92 static int raw_diag_dump_one(struct sk_buff *in_skb, 93 const struct nlmsghdr *nlh, 94 const struct inet_diag_req_v2 *r) 95 { 96 struct net *net = sock_net(in_skb->sk); 97 struct sk_buff *rep; 98 struct sock *sk; 99 int err; 100 101 sk = raw_sock_get(net, r); 102 if (IS_ERR(sk)) 103 return PTR_ERR(sk); 104 105 rep = nlmsg_new(sizeof(struct inet_diag_msg) + 106 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, r, 114 sk_user_ns(NETLINK_CB(in_skb).sk), 115 NETLINK_CB(in_skb).portid, 116 nlh->nlmsg_seq, 0, nlh, 117 netlink_net_capable(in_skb, CAP_NET_ADMIN)); 118 sock_put(sk); 119 120 if (err < 0) { 121 kfree_skb(rep); 122 return err; 123 } 124 125 err = netlink_unicast(net->diag_nlsk, rep, 126 NETLINK_CB(in_skb).portid, 127 MSG_DONTWAIT); 128 if (err > 0) 129 err = 0; 130 return err; 131 } 132 133 static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, 134 struct netlink_callback *cb, 135 const struct inet_diag_req_v2 *r, 136 struct nlattr *bc, bool net_admin) 137 { 138 if (!inet_diag_bc_sk(bc, sk)) 139 return 0; 140 141 return inet_sk_diag_fill(sk, NULL, skb, r, 142 sk_user_ns(NETLINK_CB(cb->skb).sk), 143 NETLINK_CB(cb->skb).portid, 144 cb->nlh->nlmsg_seq, NLM_F_MULTI, 145 cb->nlh, net_admin); 146 } 147 148 static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 149 const struct inet_diag_req_v2 *r, struct nlattr *bc) 150 { 151 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 152 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 153 struct net *net = sock_net(skb->sk); 154 int num, s_num, slot, s_slot; 155 struct sock *sk = NULL; 156 157 if (IS_ERR(hashinfo)) 158 return; 159 160 s_slot = cb->args[0]; 161 num = s_num = cb->args[1]; 162 163 read_lock(&hashinfo->lock); 164 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) { 165 num = 0; 166 167 sk_for_each(sk, &hashinfo->ht[slot]) { 168 struct inet_sock *inet = inet_sk(sk); 169 170 if (!net_eq(sock_net(sk), net)) 171 continue; 172 if (num < s_num) 173 goto next; 174 if (sk->sk_family != r->sdiag_family) 175 goto next; 176 if (r->id.idiag_sport != inet->inet_sport && 177 r->id.idiag_sport) 178 goto next; 179 if (r->id.idiag_dport != inet->inet_dport && 180 r->id.idiag_dport) 181 goto next; 182 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) 183 goto out_unlock; 184 next: 185 num++; 186 } 187 } 188 189 out_unlock: 190 read_unlock(&hashinfo->lock); 191 192 cb->args[0] = slot; 193 cb->args[1] = num; 194 } 195 196 static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 197 void *info) 198 { 199 r->idiag_rqueue = sk_rmem_alloc_get(sk); 200 r->idiag_wqueue = sk_wmem_alloc_get(sk); 201 } 202 203 #ifdef CONFIG_INET_DIAG_DESTROY 204 static int raw_diag_destroy(struct sk_buff *in_skb, 205 const struct inet_diag_req_v2 *r) 206 { 207 struct net *net = sock_net(in_skb->sk); 208 struct sock *sk; 209 int err; 210 211 sk = raw_sock_get(net, r); 212 if (IS_ERR(sk)) 213 return PTR_ERR(sk); 214 err = sock_diag_destroy(sk, ECONNABORTED); 215 sock_put(sk); 216 return err; 217 } 218 #endif 219 220 static const struct inet_diag_handler raw_diag_handler = { 221 .dump = raw_diag_dump, 222 .dump_one = raw_diag_dump_one, 223 .idiag_get_info = raw_diag_get_info, 224 .idiag_type = IPPROTO_RAW, 225 .idiag_info_size = 0, 226 #ifdef CONFIG_INET_DIAG_DESTROY 227 .destroy = raw_diag_destroy, 228 #endif 229 }; 230 231 static void __always_unused __check_inet_diag_req_raw(void) 232 { 233 /* 234 * Make sure the two structures are identical, 235 * except the @pad field. 236 */ 237 #define __offset_mismatch(m1, m2) \ 238 (offsetof(struct inet_diag_req_v2, m1) != \ 239 offsetof(struct inet_diag_req_raw, m2)) 240 241 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) != 242 sizeof(struct inet_diag_req_raw)); 243 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family)); 244 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol)); 245 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext)); 246 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol)); 247 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states)); 248 BUILD_BUG_ON(__offset_mismatch(id, id)); 249 #undef __offset_mismatch 250 } 251 252 static int __init raw_diag_init(void) 253 { 254 return inet_diag_register(&raw_diag_handler); 255 } 256 257 static void __exit raw_diag_exit(void) 258 { 259 inet_diag_unregister(&raw_diag_handler); 260 } 261 262 module_init(raw_diag_init); 263 module_exit(raw_diag_exit); 264 MODULE_LICENSE("GPL"); 265 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */); 266 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */); 267