Commit | Line | Data |
---|---|---|
96ec6327 PE |
1 | #include <linux/module.h> |
2 | #include <linux/sock_diag.h> | |
3 | #include <linux/net.h> | |
eea68e2f | 4 | #include <linux/netdevice.h> |
96ec6327 PE |
5 | #include <linux/packet_diag.h> |
6 | #include <net/net_namespace.h> | |
7 | #include <net/sock.h> | |
8 | ||
9 | #include "internal.h" | |
10 | ||
8a360be0 PE |
11 | static int pdiag_put_info(const struct packet_sock *po, struct sk_buff *nlskb) |
12 | { | |
13 | struct packet_diag_info pinfo; | |
14 | ||
15 | pinfo.pdi_index = po->ifindex; | |
16 | pinfo.pdi_version = po->tp_version; | |
17 | pinfo.pdi_reserve = po->tp_reserve; | |
18 | pinfo.pdi_copy_thresh = po->copy_thresh; | |
19 | pinfo.pdi_tstamp = po->tp_tstamp; | |
20 | ||
21 | pinfo.pdi_flags = 0; | |
22 | if (po->running) | |
23 | pinfo.pdi_flags |= PDI_RUNNING; | |
24 | if (po->auxdata) | |
25 | pinfo.pdi_flags |= PDI_AUXDATA; | |
26 | if (po->origdev) | |
27 | pinfo.pdi_flags |= PDI_ORIGDEV; | |
28 | if (po->has_vnet_hdr) | |
29 | pinfo.pdi_flags |= PDI_VNETHDR; | |
30 | if (po->tp_loss) | |
31 | pinfo.pdi_flags |= PDI_LOSS; | |
32 | ||
33 | return nla_put(nlskb, PACKET_DIAG_INFO, sizeof(pinfo), &pinfo); | |
34 | } | |
35 | ||
eea68e2f PE |
36 | static int pdiag_put_mclist(const struct packet_sock *po, struct sk_buff *nlskb) |
37 | { | |
38 | struct nlattr *mca; | |
39 | struct packet_mclist *ml; | |
40 | ||
41 | mca = nla_nest_start(nlskb, PACKET_DIAG_MCLIST); | |
42 | if (!mca) | |
43 | return -EMSGSIZE; | |
44 | ||
45 | rtnl_lock(); | |
46 | for (ml = po->mclist; ml; ml = ml->next) { | |
47 | struct packet_diag_mclist *dml; | |
48 | ||
49 | dml = nla_reserve_nohdr(nlskb, sizeof(*dml)); | |
50 | if (!dml) { | |
51 | rtnl_unlock(); | |
52 | nla_nest_cancel(nlskb, mca); | |
53 | return -EMSGSIZE; | |
54 | } | |
55 | ||
56 | dml->pdmc_index = ml->ifindex; | |
57 | dml->pdmc_type = ml->type; | |
58 | dml->pdmc_alen = ml->alen; | |
59 | dml->pdmc_count = ml->count; | |
60 | BUILD_BUG_ON(sizeof(dml->pdmc_addr) != sizeof(ml->addr)); | |
61 | memcpy(dml->pdmc_addr, ml->addr, sizeof(ml->addr)); | |
62 | } | |
63 | ||
64 | rtnl_unlock(); | |
65 | nla_nest_end(nlskb, mca); | |
66 | ||
67 | return 0; | |
68 | } | |
69 | ||
16f01365 PE |
70 | static int pdiag_put_ring(struct packet_ring_buffer *ring, int ver, int nl_type, |
71 | struct sk_buff *nlskb) | |
72 | { | |
73 | struct packet_diag_ring pdr; | |
74 | ||
75 | if (!ring->pg_vec || ((ver > TPACKET_V2) && | |
76 | (nl_type == PACKET_DIAG_TX_RING))) | |
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 | ||
fff3321d PE |
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 | ||
96ec6327 | 128 | static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct packet_diag_req *req, |
15e47304 | 129 | u32 portid, u32 seq, u32 flags, int sk_ino) |
96ec6327 PE |
130 | { |
131 | struct nlmsghdr *nlh; | |
132 | struct packet_diag_msg *rp; | |
16f01365 | 133 | struct packet_sock *po = pkt_sk(sk); |
96ec6327 | 134 | |
15e47304 | 135 | nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags); |
96ec6327 PE |
136 | if (!nlh) |
137 | return -EMSGSIZE; | |
138 | ||
139 | rp = nlmsg_data(nlh); | |
140 | rp->pdiag_family = AF_PACKET; | |
141 | rp->pdiag_type = sk->sk_type; | |
142 | rp->pdiag_num = ntohs(po->num); | |
143 | rp->pdiag_ino = sk_ino; | |
144 | sock_diag_save_cookie(sk, rp->pdiag_cookie); | |
145 | ||
8a360be0 PE |
146 | if ((req->pdiag_show & PACKET_SHOW_INFO) && |
147 | pdiag_put_info(po, skb)) | |
148 | goto out_nlmsg_trim; | |
149 | ||
eea68e2f PE |
150 | if ((req->pdiag_show & PACKET_SHOW_MCLIST) && |
151 | pdiag_put_mclist(po, skb)) | |
152 | goto out_nlmsg_trim; | |
153 | ||
16f01365 PE |
154 | if ((req->pdiag_show & PACKET_SHOW_RING_CFG) && |
155 | pdiag_put_rings_cfg(po, skb)) | |
156 | goto out_nlmsg_trim; | |
157 | ||
fff3321d PE |
158 | if ((req->pdiag_show & PACKET_SHOW_FANOUT) && |
159 | pdiag_put_fanout(po, skb)) | |
160 | goto out_nlmsg_trim; | |
161 | ||
96ec6327 | 162 | return nlmsg_end(skb, nlh); |
8a360be0 PE |
163 | |
164 | out_nlmsg_trim: | |
165 | nlmsg_cancel(skb, nlh); | |
166 | return -EMSGSIZE; | |
96ec6327 PE |
167 | } |
168 | ||
169 | static int packet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb) | |
170 | { | |
171 | int num = 0, s_num = cb->args[0]; | |
172 | struct packet_diag_req *req; | |
173 | struct net *net; | |
174 | struct sock *sk; | |
175 | struct hlist_node *node; | |
176 | ||
177 | net = sock_net(skb->sk); | |
178 | req = nlmsg_data(cb->nlh); | |
179 | ||
0fa7fa98 PE |
180 | mutex_lock(&net->packet.sklist_lock); |
181 | sk_for_each(sk, node, &net->packet.sklist) { | |
96ec6327 PE |
182 | if (!net_eq(sock_net(sk), net)) |
183 | continue; | |
184 | if (num < s_num) | |
185 | goto next; | |
186 | ||
15e47304 | 187 | if (sk_diag_fill(sk, skb, req, NETLINK_CB(cb->skb).portid, |
96ec6327 PE |
188 | cb->nlh->nlmsg_seq, NLM_F_MULTI, |
189 | sock_i_ino(sk)) < 0) | |
190 | goto done; | |
191 | next: | |
192 | num++; | |
193 | } | |
194 | done: | |
0fa7fa98 | 195 | mutex_unlock(&net->packet.sklist_lock); |
96ec6327 PE |
196 | cb->args[0] = num; |
197 | ||
198 | return skb->len; | |
199 | } | |
200 | ||
201 | static int packet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h) | |
202 | { | |
203 | int hdrlen = sizeof(struct packet_diag_req); | |
204 | struct net *net = sock_net(skb->sk); | |
205 | struct packet_diag_req *req; | |
206 | ||
207 | if (nlmsg_len(h) < hdrlen) | |
208 | return -EINVAL; | |
209 | ||
210 | req = nlmsg_data(h); | |
211 | /* Make it possible to support protocol filtering later */ | |
212 | if (req->sdiag_protocol) | |
213 | return -EINVAL; | |
214 | ||
215 | if (h->nlmsg_flags & NLM_F_DUMP) { | |
216 | struct netlink_dump_control c = { | |
217 | .dump = packet_diag_dump, | |
218 | }; | |
219 | return netlink_dump_start(net->diag_nlsk, skb, h, &c); | |
220 | } else | |
221 | return -EOPNOTSUPP; | |
222 | } | |
223 | ||
224 | static const struct sock_diag_handler packet_diag_handler = { | |
225 | .family = AF_PACKET, | |
226 | .dump = packet_diag_handler_dump, | |
227 | }; | |
228 | ||
229 | static int __init packet_diag_init(void) | |
230 | { | |
231 | return sock_diag_register(&packet_diag_handler); | |
232 | } | |
233 | ||
234 | static void __exit packet_diag_exit(void) | |
235 | { | |
236 | sock_diag_unregister(&packet_diag_handler); | |
237 | } | |
238 | ||
239 | module_init(packet_diag_init); | |
240 | module_exit(packet_diag_exit); | |
241 | MODULE_LICENSE("GPL"); | |
242 | MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */); |