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 <net/net_namespace.h> 7 #include <net/sock.h> 8 9 #include "internal.h" 10 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 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 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 } 111 112 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, struct packet_diag_req *req, 129 u32 portid, u32 seq, u32 flags, int sk_ino) 130 { 131 struct nlmsghdr *nlh; 132 struct packet_diag_msg *rp; 133 struct packet_sock *po = pkt_sk(sk); 134 135 nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags); 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); 145 146 if ((req->pdiag_show & PACKET_SHOW_INFO) && 147 pdiag_put_info(po, skb)) 148 goto out_nlmsg_trim; 149 150 if ((req->pdiag_show & PACKET_SHOW_MCLIST) && 151 pdiag_put_mclist(po, skb)) 152 goto out_nlmsg_trim; 153 154 if ((req->pdiag_show & PACKET_SHOW_RING_CFG) && 155 pdiag_put_rings_cfg(po, skb)) 156 goto out_nlmsg_trim; 157 158 if ((req->pdiag_show & PACKET_SHOW_FANOUT) && 159 pdiag_put_fanout(po, skb)) 160 goto out_nlmsg_trim; 161 162 return nlmsg_end(skb, nlh); 163 164 out_nlmsg_trim: 165 nlmsg_cancel(skb, nlh); 166 return -EMSGSIZE; 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); 179 180 mutex_lock(&net->packet.sklist_lock); 181 sk_for_each(sk, node, &net->packet.sklist) { 182 if (!net_eq(sock_net(sk), net)) 183 continue; 184 if (num < s_num) 185 goto next; 186 187 if (sk_diag_fill(sk, skb, req, NETLINK_CB(cb->skb).portid, 188 cb->nlh->nlmsg_seq, NLM_F_MULTI, 189 sock_i_ino(sk)) < 0) 190 goto done; 191 next: 192 num++; 193 } 194 done: 195 mutex_unlock(&net->packet.sklist_lock); 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 */); 243