Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
[platform/kernel/linux-starfive.git] / net / packet / diag.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 #include <linux/module.h>
3 #include <linux/sock_diag.h>
4 #include <linux/net.h>
5 #include <linux/netdevice.h>
6 #include <linux/packet_diag.h>
7 #include <linux/percpu.h>
8 #include <net/net_namespace.h>
9 #include <net/sock.h>
10
11 #include "internal.h"
12
13 static int pdiag_put_info(const struct packet_sock *po, struct sk_buff *nlskb)
14 {
15         struct packet_diag_info pinfo;
16
17         pinfo.pdi_index = po->ifindex;
18         pinfo.pdi_version = po->tp_version;
19         pinfo.pdi_reserve = po->tp_reserve;
20         pinfo.pdi_copy_thresh = po->copy_thresh;
21         pinfo.pdi_tstamp = po->tp_tstamp;
22
23         pinfo.pdi_flags = 0;
24         if (po->running)
25                 pinfo.pdi_flags |= PDI_RUNNING;
26         if (po->auxdata)
27                 pinfo.pdi_flags |= PDI_AUXDATA;
28         if (po->origdev)
29                 pinfo.pdi_flags |= PDI_ORIGDEV;
30         if (po->has_vnet_hdr)
31                 pinfo.pdi_flags |= PDI_VNETHDR;
32         if (po->tp_loss)
33                 pinfo.pdi_flags |= PDI_LOSS;
34
35         return nla_put(nlskb, PACKET_DIAG_INFO, sizeof(pinfo), &pinfo);
36 }
37
38 static int pdiag_put_mclist(const struct packet_sock *po, struct sk_buff *nlskb)
39 {
40         struct nlattr *mca;
41         struct packet_mclist *ml;
42
43         mca = nla_nest_start_noflag(nlskb, PACKET_DIAG_MCLIST);
44         if (!mca)
45                 return -EMSGSIZE;
46
47         rtnl_lock();
48         for (ml = po->mclist; ml; ml = ml->next) {
49                 struct packet_diag_mclist *dml;
50
51                 dml = nla_reserve_nohdr(nlskb, sizeof(*dml));
52                 if (!dml) {
53                         rtnl_unlock();
54                         nla_nest_cancel(nlskb, mca);
55                         return -EMSGSIZE;
56                 }
57
58                 dml->pdmc_index = ml->ifindex;
59                 dml->pdmc_type = ml->type;
60                 dml->pdmc_alen = ml->alen;
61                 dml->pdmc_count = ml->count;
62                 BUILD_BUG_ON(sizeof(dml->pdmc_addr) != sizeof(ml->addr));
63                 memcpy(dml->pdmc_addr, ml->addr, sizeof(ml->addr));
64         }
65
66         rtnl_unlock();
67         nla_nest_end(nlskb, mca);
68
69         return 0;
70 }
71
72 static int pdiag_put_ring(struct packet_ring_buffer *ring, int ver, int nl_type,
73                 struct sk_buff *nlskb)
74 {
75         struct packet_diag_ring pdr;
76
77         if (!ring->pg_vec)
78                 return 0;
79
80         pdr.pdr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
81         pdr.pdr_block_nr = ring->pg_vec_len;
82         pdr.pdr_frame_size = ring->frame_size;
83         pdr.pdr_frame_nr = ring->frame_max + 1;
84
85         if (ver > TPACKET_V2) {
86                 pdr.pdr_retire_tmo = ring->prb_bdqc.retire_blk_tov;
87                 pdr.pdr_sizeof_priv = ring->prb_bdqc.blk_sizeof_priv;
88                 pdr.pdr_features = ring->prb_bdqc.feature_req_word;
89         } else {
90                 pdr.pdr_retire_tmo = 0;
91                 pdr.pdr_sizeof_priv = 0;
92                 pdr.pdr_features = 0;
93         }
94
95         return nla_put(nlskb, nl_type, sizeof(pdr), &pdr);
96 }
97
98 static int pdiag_put_rings_cfg(struct packet_sock *po, struct sk_buff *skb)
99 {
100         int ret;
101
102         mutex_lock(&po->pg_vec_lock);
103         ret = pdiag_put_ring(&po->rx_ring, po->tp_version,
104                         PACKET_DIAG_RX_RING, skb);
105         if (!ret)
106                 ret = pdiag_put_ring(&po->tx_ring, po->tp_version,
107                                 PACKET_DIAG_TX_RING, skb);
108         mutex_unlock(&po->pg_vec_lock);
109
110         return ret;
111 }
112
113 static int pdiag_put_fanout(struct packet_sock *po, struct sk_buff *nlskb)
114 {
115         int ret = 0;
116
117         mutex_lock(&fanout_mutex);
118         if (po->fanout) {
119                 u32 val;
120
121                 val = (u32)po->fanout->id | ((u32)po->fanout->type << 16);
122                 ret = nla_put_u32(nlskb, PACKET_DIAG_FANOUT, val);
123         }
124         mutex_unlock(&fanout_mutex);
125
126         return ret;
127 }
128
129 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
130                         struct packet_diag_req *req,
131                         bool may_report_filterinfo,
132                         struct user_namespace *user_ns,
133                         u32 portid, u32 seq, u32 flags, int sk_ino)
134 {
135         struct nlmsghdr *nlh;
136         struct packet_diag_msg *rp;
137         struct packet_sock *po = pkt_sk(sk);
138
139         nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags);
140         if (!nlh)
141                 return -EMSGSIZE;
142
143         rp = nlmsg_data(nlh);
144         rp->pdiag_family = AF_PACKET;
145         rp->pdiag_type = sk->sk_type;
146         rp->pdiag_num = ntohs(po->num);
147         rp->pdiag_ino = sk_ino;
148         sock_diag_save_cookie(sk, rp->pdiag_cookie);
149
150         if ((req->pdiag_show & PACKET_SHOW_INFO) &&
151                         pdiag_put_info(po, skb))
152                 goto out_nlmsg_trim;
153
154         if ((req->pdiag_show & PACKET_SHOW_INFO) &&
155             nla_put_u32(skb, PACKET_DIAG_UID,
156                         from_kuid_munged(user_ns, sock_i_uid(sk))))
157                 goto out_nlmsg_trim;
158
159         if ((req->pdiag_show & PACKET_SHOW_MCLIST) &&
160                         pdiag_put_mclist(po, skb))
161                 goto out_nlmsg_trim;
162
163         if ((req->pdiag_show & PACKET_SHOW_RING_CFG) &&
164                         pdiag_put_rings_cfg(po, skb))
165                 goto out_nlmsg_trim;
166
167         if ((req->pdiag_show & PACKET_SHOW_FANOUT) &&
168                         pdiag_put_fanout(po, skb))
169                 goto out_nlmsg_trim;
170
171         if ((req->pdiag_show & PACKET_SHOW_MEMINFO) &&
172             sock_diag_put_meminfo(sk, skb, PACKET_DIAG_MEMINFO))
173                 goto out_nlmsg_trim;
174
175         if ((req->pdiag_show & PACKET_SHOW_FILTER) &&
176             sock_diag_put_filterinfo(may_report_filterinfo, sk, skb,
177                                      PACKET_DIAG_FILTER))
178                 goto out_nlmsg_trim;
179
180         nlmsg_end(skb, nlh);
181         return 0;
182
183 out_nlmsg_trim:
184         nlmsg_cancel(skb, nlh);
185         return -EMSGSIZE;
186 }
187
188 static int packet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
189 {
190         int num = 0, s_num = cb->args[0];
191         struct packet_diag_req *req;
192         struct net *net;
193         struct sock *sk;
194         bool may_report_filterinfo;
195
196         net = sock_net(skb->sk);
197         req = nlmsg_data(cb->nlh);
198         may_report_filterinfo = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
199
200         mutex_lock(&net->packet.sklist_lock);
201         sk_for_each(sk, &net->packet.sklist) {
202                 if (!net_eq(sock_net(sk), net))
203                         continue;
204                 if (num < s_num)
205                         goto next;
206
207                 if (sk_diag_fill(sk, skb, req,
208                                  may_report_filterinfo,
209                                  sk_user_ns(NETLINK_CB(cb->skb).sk),
210                                  NETLINK_CB(cb->skb).portid,
211                                  cb->nlh->nlmsg_seq, NLM_F_MULTI,
212                                  sock_i_ino(sk)) < 0)
213                         goto done;
214 next:
215                 num++;
216         }
217 done:
218         mutex_unlock(&net->packet.sklist_lock);
219         cb->args[0] = num;
220
221         return skb->len;
222 }
223
224 static int packet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
225 {
226         int hdrlen = sizeof(struct packet_diag_req);
227         struct net *net = sock_net(skb->sk);
228         struct packet_diag_req *req;
229
230         if (nlmsg_len(h) < hdrlen)
231                 return -EINVAL;
232
233         req = nlmsg_data(h);
234         /* Make it possible to support protocol filtering later */
235         if (req->sdiag_protocol)
236                 return -EINVAL;
237
238         if (h->nlmsg_flags & NLM_F_DUMP) {
239                 struct netlink_dump_control c = {
240                         .dump = packet_diag_dump,
241                 };
242                 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
243         } else
244                 return -EOPNOTSUPP;
245 }
246
247 static const struct sock_diag_handler packet_diag_handler = {
248         .family = AF_PACKET,
249         .dump = packet_diag_handler_dump,
250 };
251
252 static int __init packet_diag_init(void)
253 {
254         return sock_diag_register(&packet_diag_handler);
255 }
256
257 static void __exit packet_diag_exit(void)
258 {
259         sock_diag_unregister(&packet_diag_handler);
260 }
261
262 module_init(packet_diag_init);
263 module_exit(packet_diag_exit);
264 MODULE_LICENSE("GPL");
265 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);