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 <linux/percpu.h>
   7#include <net/net_namespace.h>
   8#include <net/sock.h>
   9
  10#include "internal.h"
  11
  12static 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
  37static 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
  71static 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 || ((ver > TPACKET_V2) &&
  77                                (nl_type == PACKET_DIAG_TX_RING)))
  78                return 0;
  79
  80        pdr.pdr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
  81        pdr.pdr_block_nr = ring->pg_vec_len;
  82        pdr.pdr_frame_size = ring->frame_size;
  83        pdr.pdr_frame_nr = ring->frame_max + 1;
  84
  85        if (ver > TPACKET_V2) {
  86                pdr.pdr_retire_tmo = ring->prb_bdqc.retire_blk_tov;
  87                pdr.pdr_sizeof_priv = ring->prb_bdqc.blk_sizeof_priv;
  88                pdr.pdr_features = ring->prb_bdqc.feature_req_word;
  89        } else {
  90                pdr.pdr_retire_tmo = 0;
  91                pdr.pdr_sizeof_priv = 0;
  92                pdr.pdr_features = 0;
  93        }
  94
  95        return nla_put(nlskb, nl_type, sizeof(pdr), &pdr);
  96}
  97
  98static int pdiag_put_rings_cfg(struct packet_sock *po, struct sk_buff *skb)
  99{
 100        int ret;
 101
 102        mutex_lock(&po->pg_vec_lock);
 103        ret = pdiag_put_ring(&po->rx_ring, po->tp_version,
 104                        PACKET_DIAG_RX_RING, skb);
 105        if (!ret)
 106                ret = pdiag_put_ring(&po->tx_ring, po->tp_version,
 107                                PACKET_DIAG_TX_RING, skb);
 108        mutex_unlock(&po->pg_vec_lock);
 109
 110        return ret;
 111}
 112
 113static int pdiag_put_fanout(struct packet_sock *po, struct sk_buff *nlskb)
 114{
 115        int ret = 0;
 116
 117        mutex_lock(&fanout_mutex);
 118        if (po->fanout) {
 119                u32 val;
 120
 121                val = (u32)po->fanout->id | ((u32)po->fanout->type << 16);
 122                ret = nla_put_u32(nlskb, PACKET_DIAG_FANOUT, val);
 123        }
 124        mutex_unlock(&fanout_mutex);
 125
 126        return ret;
 127}
 128
 129static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
 130                        struct packet_diag_req *req,
 131                        bool may_report_filterinfo,
 132                        struct user_namespace *user_ns,
 133                        u32 portid, u32 seq, u32 flags, int sk_ino)
 134{
 135        struct nlmsghdr *nlh;
 136        struct packet_diag_msg *rp;
 137        struct packet_sock *po = pkt_sk(sk);
 138
 139        nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags);
 140        if (!nlh)
 141                return -EMSGSIZE;
 142
 143        rp = nlmsg_data(nlh);
 144        rp->pdiag_family = AF_PACKET;
 145        rp->pdiag_type = sk->sk_type;
 146        rp->pdiag_num = ntohs(po->num);
 147        rp->pdiag_ino = sk_ino;
 148        sock_diag_save_cookie(sk, rp->pdiag_cookie);
 149
 150        if ((req->pdiag_show & PACKET_SHOW_INFO) &&
 151                        pdiag_put_info(po, skb))
 152                goto out_nlmsg_trim;
 153
 154        if ((req->pdiag_show & PACKET_SHOW_INFO) &&
 155            nla_put_u32(skb, PACKET_DIAG_UID,
 156                        from_kuid_munged(user_ns, sock_i_uid(sk))))
 157                goto out_nlmsg_trim;
 158
 159        if ((req->pdiag_show & PACKET_SHOW_MCLIST) &&
 160                        pdiag_put_mclist(po, skb))
 161                goto out_nlmsg_trim;
 162
 163        if ((req->pdiag_show & PACKET_SHOW_RING_CFG) &&
 164                        pdiag_put_rings_cfg(po, skb))
 165                goto out_nlmsg_trim;
 166
 167        if ((req->pdiag_show & PACKET_SHOW_FANOUT) &&
 168                        pdiag_put_fanout(po, skb))
 169                goto out_nlmsg_trim;
 170
 171        if ((req->pdiag_show & PACKET_SHOW_MEMINFO) &&
 172            sock_diag_put_meminfo(sk, skb, PACKET_DIAG_MEMINFO))
 173                goto out_nlmsg_trim;
 174
 175        if ((req->pdiag_show & PACKET_SHOW_FILTER) &&
 176            sock_diag_put_filterinfo(may_report_filterinfo, sk, skb,
 177                                     PACKET_DIAG_FILTER))
 178                goto out_nlmsg_trim;
 179
 180        nlmsg_end(skb, nlh);
 181        return 0;
 182
 183out_nlmsg_trim:
 184        nlmsg_cancel(skb, nlh);
 185        return -EMSGSIZE;
 186}
 187
 188static int packet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
 189{
 190        int num = 0, s_num = cb->args[0];
 191        struct packet_diag_req *req;
 192        struct net *net;
 193        struct sock *sk;
 194        bool may_report_filterinfo;
 195
 196        net = sock_net(skb->sk);
 197        req = nlmsg_data(cb->nlh);
 198        may_report_filterinfo = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
 199
 200        mutex_lock(&net->packet.sklist_lock);
 201        sk_for_each(sk, &net->packet.sklist) {
 202                if (!net_eq(sock_net(sk), net))
 203                        continue;
 204                if (num < s_num)
 205                        goto next;
 206
 207                if (sk_diag_fill(sk, skb, req,
 208                                 may_report_filterinfo,
 209                                 sk_user_ns(NETLINK_CB(cb->skb).sk),
 210                                 NETLINK_CB(cb->skb).portid,
 211                                 cb->nlh->nlmsg_seq, NLM_F_MULTI,
 212                                 sock_i_ino(sk)) < 0)
 213                        goto done;
 214next:
 215                num++;
 216        }
 217done:
 218        mutex_unlock(&net->packet.sklist_lock);
 219        cb->args[0] = num;
 220
 221        return skb->len;
 222}
 223
 224static int packet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
 225{
 226        int hdrlen = sizeof(struct packet_diag_req);
 227        struct net *net = sock_net(skb->sk);
 228        struct packet_diag_req *req;
 229
 230        if (nlmsg_len(h) < hdrlen)
 231                return -EINVAL;
 232
 233        req = nlmsg_data(h);
 234        /* Make it possible to support protocol filtering later */
 235        if (req->sdiag_protocol)
 236                return -EINVAL;
 237
 238        if (h->nlmsg_flags & NLM_F_DUMP) {
 239                struct netlink_dump_control c = {
 240                        .dump = packet_diag_dump,
 241                };
 242                return netlink_dump_start(net->diag_nlsk, skb, h, &c);
 243        } else
 244                return -EOPNOTSUPP;
 245}
 246
 247static const struct sock_diag_handler packet_diag_handler = {
 248        .family = AF_PACKET,
 249        .dump = packet_diag_handler_dump,
 250};
 251
 252static int __init packet_diag_init(void)
 253{
 254        return sock_diag_register(&packet_diag_handler);
 255}
 256
 257static void __exit packet_diag_exit(void)
 258{
 259        sock_diag_unregister(&packet_diag_handler);
 260}
 261
 262module_init(packet_diag_init);
 263module_exit(packet_diag_exit);
 264MODULE_LICENSE("GPL");
 265MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);
 266