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TOMOYO Linux Cross Reference
Linux/net/packet/diag.c

Version: ~ [ linux-5.7-rc7 ] ~ [ linux-5.6.14 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.42 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.124 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.181 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.224 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.224 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.84 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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 */);
265 

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