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