linux/net/packet/diag.c
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   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
  11static 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
  36static 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
  70static 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
  97static 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
 112static 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
 128static 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
 164out_nlmsg_trim:
 165        nlmsg_cancel(skb, nlh);
 166        return -EMSGSIZE;
 167}
 168
 169static 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;
 191next:
 192                num++;
 193        }
 194done:
 195        mutex_unlock(&net->packet.sklist_lock);
 196        cb->args[0] = num;
 197
 198        return skb->len;
 199}
 200
 201static 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
 224static const struct sock_diag_handler packet_diag_handler = {
 225        .family = AF_PACKET,
 226        .dump = packet_diag_handler_dump,
 227};
 228
 229static int __init packet_diag_init(void)
 230{
 231        return sock_diag_register(&packet_diag_handler);
 232}
 233
 234static void __exit packet_diag_exit(void)
 235{
 236        sock_diag_unregister(&packet_diag_handler);
 237}
 238
 239module_init(packet_diag_init);
 240module_exit(packet_diag_exit);
 241MODULE_LICENSE("GPL");
 242MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);
 243
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