raw_diag.c (6373B)
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 17static struct raw_hashinfo * 18raw_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 37static 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 58static 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 } 84out_unlock: 85 read_unlock(&hashinfo->lock); 86 87 return sk ? sk : ERR_PTR(-ENOENT); 88} 89 90static 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 = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid); 123 124 return err; 125} 126 127static int sk_diag_dump(struct sock *sk, struct sk_buff *skb, 128 struct netlink_callback *cb, 129 const struct inet_diag_req_v2 *r, 130 struct nlattr *bc, bool net_admin) 131{ 132 if (!inet_diag_bc_sk(bc, sk)) 133 return 0; 134 135 return inet_sk_diag_fill(sk, NULL, skb, cb, r, NLM_F_MULTI, net_admin); 136} 137 138static void raw_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, 139 const struct inet_diag_req_v2 *r) 140{ 141 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN); 142 struct raw_hashinfo *hashinfo = raw_get_hashinfo(r); 143 struct net *net = sock_net(skb->sk); 144 struct inet_diag_dump_data *cb_data; 145 int num, s_num, slot, s_slot; 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 read_lock(&hashinfo->lock); 158 for (slot = s_slot; slot < RAW_HTABLE_SIZE; s_num = 0, slot++) { 159 num = 0; 160 161 sk_for_each(sk, &hashinfo->ht[slot]) { 162 struct inet_sock *inet = inet_sk(sk); 163 164 if (!net_eq(sock_net(sk), net)) 165 continue; 166 if (num < s_num) 167 goto next; 168 if (sk->sk_family != r->sdiag_family) 169 goto next; 170 if (r->id.idiag_sport != inet->inet_sport && 171 r->id.idiag_sport) 172 goto next; 173 if (r->id.idiag_dport != inet->inet_dport && 174 r->id.idiag_dport) 175 goto next; 176 if (sk_diag_dump(sk, skb, cb, r, bc, net_admin) < 0) 177 goto out_unlock; 178next: 179 num++; 180 } 181 } 182 183out_unlock: 184 read_unlock(&hashinfo->lock); 185 186 cb->args[0] = slot; 187 cb->args[1] = num; 188} 189 190static void raw_diag_get_info(struct sock *sk, struct inet_diag_msg *r, 191 void *info) 192{ 193 r->idiag_rqueue = sk_rmem_alloc_get(sk); 194 r->idiag_wqueue = sk_wmem_alloc_get(sk); 195} 196 197#ifdef CONFIG_INET_DIAG_DESTROY 198static int raw_diag_destroy(struct sk_buff *in_skb, 199 const struct inet_diag_req_v2 *r) 200{ 201 struct net *net = sock_net(in_skb->sk); 202 struct sock *sk; 203 int err; 204 205 sk = raw_sock_get(net, r); 206 if (IS_ERR(sk)) 207 return PTR_ERR(sk); 208 err = sock_diag_destroy(sk, ECONNABORTED); 209 sock_put(sk); 210 return err; 211} 212#endif 213 214static const struct inet_diag_handler raw_diag_handler = { 215 .dump = raw_diag_dump, 216 .dump_one = raw_diag_dump_one, 217 .idiag_get_info = raw_diag_get_info, 218 .idiag_type = IPPROTO_RAW, 219 .idiag_info_size = 0, 220#ifdef CONFIG_INET_DIAG_DESTROY 221 .destroy = raw_diag_destroy, 222#endif 223}; 224 225static void __always_unused __check_inet_diag_req_raw(void) 226{ 227 /* 228 * Make sure the two structures are identical, 229 * except the @pad field. 230 */ 231#define __offset_mismatch(m1, m2) \ 232 (offsetof(struct inet_diag_req_v2, m1) != \ 233 offsetof(struct inet_diag_req_raw, m2)) 234 235 BUILD_BUG_ON(sizeof(struct inet_diag_req_v2) != 236 sizeof(struct inet_diag_req_raw)); 237 BUILD_BUG_ON(__offset_mismatch(sdiag_family, sdiag_family)); 238 BUILD_BUG_ON(__offset_mismatch(sdiag_protocol, sdiag_protocol)); 239 BUILD_BUG_ON(__offset_mismatch(idiag_ext, idiag_ext)); 240 BUILD_BUG_ON(__offset_mismatch(pad, sdiag_raw_protocol)); 241 BUILD_BUG_ON(__offset_mismatch(idiag_states, idiag_states)); 242 BUILD_BUG_ON(__offset_mismatch(id, id)); 243#undef __offset_mismatch 244} 245 246static int __init raw_diag_init(void) 247{ 248 return inet_diag_register(&raw_diag_handler); 249} 250 251static void __exit raw_diag_exit(void) 252{ 253 inet_diag_unregister(&raw_diag_handler); 254} 255 256module_init(raw_diag_init); 257module_exit(raw_diag_exit); 258MODULE_LICENSE("GPL"); 259MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2-255 /* AF_INET - IPPROTO_RAW */); 260MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10-255 /* AF_INET6 - IPPROTO_RAW */);