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