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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
eaaa3139 AV |
2 | #include <linux/module.h> |
3 | ||
4 | #include <net/sock.h> | |
5 | #include <linux/netlink.h> | |
6 | #include <linux/sock_diag.h> | |
7 | #include <linux/netlink_diag.h> | |
e341694e | 8 | #include <linux/rhashtable.h> |
eaaa3139 AV |
9 | |
10 | #include "af_netlink.h" | |
11 | ||
12 | static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb) | |
13 | { | |
14 | struct netlink_sock *nlk = nlk_sk(sk); | |
15 | ||
16 | if (nlk->groups == NULL) | |
17 | return 0; | |
18 | ||
19 | return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups), | |
20 | nlk->groups); | |
21 | } | |
22 | ||
457c79e5 AV |
23 | static int sk_diag_put_flags(struct sock *sk, struct sk_buff *skb) |
24 | { | |
25 | struct netlink_sock *nlk = nlk_sk(sk); | |
26 | u32 flags = 0; | |
27 | ||
28 | if (nlk->cb_running) | |
29 | flags |= NDIAG_FLAG_CB_RUNNING; | |
8fe08d70 | 30 | if (nlk_test_bit(RECV_PKTINFO, sk)) |
457c79e5 | 31 | flags |= NDIAG_FLAG_PKTINFO; |
8fe08d70 | 32 | if (nlk_test_bit(BROADCAST_SEND_ERROR, sk)) |
457c79e5 | 33 | flags |= NDIAG_FLAG_BROADCAST_ERROR; |
8fe08d70 | 34 | if (nlk_test_bit(RECV_NO_ENOBUFS, sk)) |
457c79e5 | 35 | flags |= NDIAG_FLAG_NO_ENOBUFS; |
8fe08d70 | 36 | if (nlk_test_bit(LISTEN_ALL_NSID, sk)) |
457c79e5 | 37 | flags |= NDIAG_FLAG_LISTEN_ALL_NSID; |
8fe08d70 | 38 | if (nlk_test_bit(CAP_ACK, sk)) |
457c79e5 AV |
39 | flags |= NDIAG_FLAG_CAP_ACK; |
40 | ||
41 | return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags); | |
42 | } | |
43 | ||
eaaa3139 AV |
44 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, |
45 | struct netlink_diag_req *req, | |
46 | u32 portid, u32 seq, u32 flags, int sk_ino) | |
47 | { | |
48 | struct nlmsghdr *nlh; | |
49 | struct netlink_diag_msg *rep; | |
50 | struct netlink_sock *nlk = nlk_sk(sk); | |
51 | ||
52 | nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep), | |
53 | flags); | |
54 | if (!nlh) | |
55 | return -EMSGSIZE; | |
56 | ||
57 | rep = nlmsg_data(nlh); | |
58 | rep->ndiag_family = AF_NETLINK; | |
59 | rep->ndiag_type = sk->sk_type; | |
60 | rep->ndiag_protocol = sk->sk_protocol; | |
61 | rep->ndiag_state = sk->sk_state; | |
62 | ||
63 | rep->ndiag_ino = sk_ino; | |
64 | rep->ndiag_portid = nlk->portid; | |
65 | rep->ndiag_dst_portid = nlk->dst_portid; | |
66 | rep->ndiag_dst_group = nlk->dst_group; | |
67 | sock_diag_save_cookie(sk, rep->ndiag_cookie); | |
68 | ||
69 | if ((req->ndiag_show & NDIAG_SHOW_GROUPS) && | |
70 | sk_diag_dump_groups(sk, skb)) | |
71 | goto out_nlmsg_trim; | |
72 | ||
73 | if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) && | |
74 | sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO)) | |
75 | goto out_nlmsg_trim; | |
76 | ||
457c79e5 AV |
77 | if ((req->ndiag_show & NDIAG_SHOW_FLAGS) && |
78 | sk_diag_put_flags(sk, skb)) | |
79 | goto out_nlmsg_trim; | |
80 | ||
053c095a JB |
81 | nlmsg_end(skb, nlh); |
82 | return 0; | |
eaaa3139 AV |
83 | |
84 | out_nlmsg_trim: | |
85 | nlmsg_cancel(skb, nlh); | |
86 | return -EMSGSIZE; | |
87 | } | |
88 | ||
89 | static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb, | |
90 | int protocol, int s_num) | |
91 | { | |
ad202074 | 92 | struct rhashtable_iter *hti = (void *)cb->args[2]; |
eaaa3139 | 93 | struct netlink_table *tbl = &nl_table[protocol]; |
eaaa3139 AV |
94 | struct net *net = sock_net(skb->sk); |
95 | struct netlink_diag_req *req; | |
e341694e | 96 | struct netlink_sock *nlsk; |
8d61f926 | 97 | unsigned long flags; |
eaaa3139 | 98 | struct sock *sk; |
ad202074 HX |
99 | int num = 2; |
100 | int ret = 0; | |
eaaa3139 AV |
101 | |
102 | req = nlmsg_data(cb->nlh); | |
103 | ||
ad202074 HX |
104 | if (s_num > 1) |
105 | goto mc_list; | |
88d6ed15 | 106 | |
ad202074 | 107 | num--; |
e341694e | 108 | |
ad202074 HX |
109 | if (!hti) { |
110 | hti = kmalloc(sizeof(*hti), GFP_KERNEL); | |
111 | if (!hti) | |
112 | return -ENOMEM; | |
113 | ||
114 | cb->args[2] = (long)hti; | |
115 | } | |
116 | ||
117 | if (!s_num) | |
118 | rhashtable_walk_enter(&tbl->hash, hti); | |
119 | ||
97a6ec4a | 120 | rhashtable_walk_start(hti); |
ad202074 HX |
121 | |
122 | while ((nlsk = rhashtable_walk_next(hti))) { | |
123 | if (IS_ERR(nlsk)) { | |
124 | ret = PTR_ERR(nlsk); | |
125 | if (ret == -EAGAIN) { | |
126 | ret = 0; | |
eaaa3139 AV |
127 | continue; |
128 | } | |
ad202074 HX |
129 | break; |
130 | } | |
eaaa3139 | 131 | |
ad202074 | 132 | sk = (struct sock *)nlsk; |
eaaa3139 | 133 | |
ad202074 HX |
134 | if (!net_eq(sock_net(sk), net)) |
135 | continue; | |
136 | ||
137 | if (sk_diag_fill(sk, skb, req, | |
138 | NETLINK_CB(cb->skb).portid, | |
139 | cb->nlh->nlmsg_seq, | |
140 | NLM_F_MULTI, | |
141 | sock_i_ino(sk)) < 0) { | |
142 | ret = 1; | |
143 | break; | |
eaaa3139 AV |
144 | } |
145 | } | |
146 | ||
ad202074 | 147 | rhashtable_walk_stop(hti); |
97a6ec4a | 148 | |
ad202074 HX |
149 | if (ret) |
150 | goto done; | |
151 | ||
152 | rhashtable_walk_exit(hti); | |
ad202074 HX |
153 | num++; |
154 | ||
155 | mc_list: | |
8d61f926 | 156 | read_lock_irqsave(&nl_table_lock, flags); |
eaaa3139 AV |
157 | sk_for_each_bound(sk, &tbl->mc_list) { |
158 | if (sk_hashed(sk)) | |
159 | continue; | |
160 | if (!net_eq(sock_net(sk), net)) | |
161 | continue; | |
162 | if (num < s_num) { | |
163 | num++; | |
164 | continue; | |
165 | } | |
166 | ||
167 | if (sk_diag_fill(sk, skb, req, | |
168 | NETLINK_CB(cb->skb).portid, | |
169 | cb->nlh->nlmsg_seq, | |
170 | NLM_F_MULTI, | |
25a9c8a4 | 171 | __sock_i_ino(sk)) < 0) { |
eaaa3139 | 172 | ret = 1; |
ad202074 | 173 | break; |
eaaa3139 AV |
174 | } |
175 | num++; | |
176 | } | |
8d61f926 | 177 | read_unlock_irqrestore(&nl_table_lock, flags); |
ad202074 | 178 | |
eaaa3139 AV |
179 | done: |
180 | cb->args[0] = num; | |
eaaa3139 AV |
181 | |
182 | return ret; | |
183 | } | |
184 | ||
185 | static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
186 | { | |
187 | struct netlink_diag_req *req; | |
188 | int s_num = cb->args[0]; | |
ad202074 | 189 | int err = 0; |
eaaa3139 AV |
190 | |
191 | req = nlmsg_data(cb->nlh); | |
192 | ||
eaaa3139 AV |
193 | if (req->sdiag_protocol == NDIAG_PROTO_ALL) { |
194 | int i; | |
195 | ||
196 | for (i = cb->args[1]; i < MAX_LINKS; i++) { | |
ad202074 HX |
197 | err = __netlink_diag_dump(skb, cb, i, s_num); |
198 | if (err) | |
eaaa3139 AV |
199 | break; |
200 | s_num = 0; | |
201 | } | |
ad202074 | 202 | cb->args[1] = i; |
eaaa3139 | 203 | } else { |
93636d1f | 204 | if (req->sdiag_protocol >= MAX_LINKS) |
eaaa3139 | 205 | return -ENOENT; |
eaaa3139 | 206 | |
ad202074 | 207 | err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num); |
eaaa3139 AV |
208 | } |
209 | ||
ad202074 HX |
210 | return err < 0 ? err : skb->len; |
211 | } | |
212 | ||
213 | static int netlink_diag_dump_done(struct netlink_callback *cb) | |
214 | { | |
215 | struct rhashtable_iter *hti = (void *)cb->args[2]; | |
216 | ||
217 | if (cb->args[0] == 1) | |
218 | rhashtable_walk_exit(hti); | |
eaaa3139 | 219 | |
ad202074 HX |
220 | kfree(hti); |
221 | ||
222 | return 0; | |
eaaa3139 AV |
223 | } |
224 | ||
225 | static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
226 | { | |
227 | int hdrlen = sizeof(struct netlink_diag_req); | |
228 | struct net *net = sock_net(skb->sk); | |
229 | ||
230 | if (nlmsg_len(h) < hdrlen) | |
231 | return -EINVAL; | |
232 | ||
233 | if (h->nlmsg_flags & NLM_F_DUMP) { | |
234 | struct netlink_dump_control c = { | |
235 | .dump = netlink_diag_dump, | |
ad202074 | 236 | .done = netlink_diag_dump_done, |
eaaa3139 AV |
237 | }; |
238 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); | |
239 | } else | |
240 | return -EOPNOTSUPP; | |
241 | } | |
242 | ||
243 | static const struct sock_diag_handler netlink_diag_handler = { | |
244 | .family = AF_NETLINK, | |
245 | .dump = netlink_diag_handler_dump, | |
246 | }; | |
247 | ||
248 | static int __init netlink_diag_init(void) | |
249 | { | |
250 | return sock_diag_register(&netlink_diag_handler); | |
251 | } | |
252 | ||
253 | static void __exit netlink_diag_exit(void) | |
254 | { | |
255 | sock_diag_unregister(&netlink_diag_handler); | |
256 | } | |
257 | ||
258 | module_init(netlink_diag_init); | |
259 | module_exit(netlink_diag_exit); | |
260 | MODULE_LICENSE("GPL"); | |
261 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */); |