1 files changed, 242 insertions, 0 deletions

diff --git a/net/packet/diag.c b/net/packet/diag.c
new file mode 100644
index 000000000000..8db6e21c46bd
--- /dev/null
+++ b/net/packet/diag.c
@@ -0,0 +1,242 @@
+#include <linux/module.h>
+#include <linux/sock_diag.h>
+#include <linux/net.h>
+#include <linux/netdevice.h>
+#include <linux/packet_diag.h>
+#include <net/net_namespace.h>
+#include <net/sock.h>
+
+#include "internal.h"
+
+static int pdiag_put_info(const struct packet_sock *po, struct sk_buff *nlskb)
+{
+        struct packet_diag_info pinfo;
+
+        pinfo.pdi_index = po->ifindex;
+        pinfo.pdi_version = po->tp_version;
+        pinfo.pdi_reserve = po->tp_reserve;
+        pinfo.pdi_copy_thresh = po->copy_thresh;
+        pinfo.pdi_tstamp = po->tp_tstamp;
+
+        pinfo.pdi_flags = 0;
+        if (po->running)
+                pinfo.pdi_flags |= PDI_RUNNING;
+        if (po->auxdata)
+                pinfo.pdi_flags |= PDI_AUXDATA;
+        if (po->origdev)
+                pinfo.pdi_flags |= PDI_ORIGDEV;
+        if (po->has_vnet_hdr)
+                pinfo.pdi_flags |= PDI_VNETHDR;
+        if (po->tp_loss)
+                pinfo.pdi_flags |= PDI_LOSS;
+
+        return nla_put(nlskb, PACKET_DIAG_INFO, sizeof(pinfo), &pinfo);
+}
+
+static int pdiag_put_mclist(const struct packet_sock *po, struct sk_buff *nlskb)
+{
+        struct nlattr *mca;
+        struct packet_mclist *ml;
+
+        mca = nla_nest_start(nlskb, PACKET_DIAG_MCLIST);
+        if (!mca)
+                return -EMSGSIZE;
+
+        rtnl_lock();
+        for (ml = po->mclist; ml; ml = ml->next) {
+                struct packet_diag_mclist *dml;
+
+                dml = nla_reserve_nohdr(nlskb, sizeof(*dml));
+                if (!dml) {
+                        rtnl_unlock();
+                        nla_nest_cancel(nlskb, mca);
+                        return -EMSGSIZE;
+                }
+
+                dml->pdmc_index = ml->ifindex;
+                dml->pdmc_type = ml->type;
+                dml->pdmc_alen = ml->alen;
+                dml->pdmc_count = ml->count;
+                BUILD_BUG_ON(sizeof(dml->pdmc_addr) != sizeof(ml->addr));
+                memcpy(dml->pdmc_addr, ml->addr, sizeof(ml->addr));
+        }
+
+        rtnl_unlock();
+        nla_nest_end(nlskb, mca);
+
+        return 0;
+}
+
+static int pdiag_put_ring(struct packet_ring_buffer *ring, int ver, int nl_type,
+                struct sk_buff *nlskb)
+{
+        struct packet_diag_ring pdr;
+
+        if (!ring->pg_vec || ((ver > TPACKET_V2) &&
+                                (nl_type == PACKET_DIAG_TX_RING)))
+                return 0;
+
+        pdr.pdr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
+        pdr.pdr_block_nr = ring->pg_vec_len;
+        pdr.pdr_frame_size = ring->frame_size;
+        pdr.pdr_frame_nr = ring->frame_max + 1;
+
+        if (ver > TPACKET_V2) {
+                pdr.pdr_retire_tmo = ring->prb_bdqc.retire_blk_tov;
+                pdr.pdr_sizeof_priv = ring->prb_bdqc.blk_sizeof_priv;
+                pdr.pdr_features = ring->prb_bdqc.feature_req_word;
+        } else {
+                pdr.pdr_retire_tmo = 0;
+                pdr.pdr_sizeof_priv = 0;
+                pdr.pdr_features = 0;
+        }
+
+        return nla_put(nlskb, nl_type, sizeof(pdr), &pdr);
+}
+
+static int pdiag_put_rings_cfg(struct packet_sock *po, struct sk_buff *skb)
+{
+        int ret;
+
+        mutex_lock(&po->pg_vec_lock);
+        ret = pdiag_put_ring(&po->rx_ring, po->tp_version,
+                        PACKET_DIAG_RX_RING, skb);
+        if (!ret)
+                ret = pdiag_put_ring(&po->tx_ring, po->tp_version,
+                                PACKET_DIAG_TX_RING, skb);
+        mutex_unlock(&po->pg_vec_lock);
+
+        return ret;
+}
+
+static int pdiag_put_fanout(struct packet_sock *po, struct sk_buff *nlskb)
+{
+        int ret = 0;
+
+        mutex_lock(&fanout_mutex);
+        if (po->fanout) {
+                u32 val;
+
+                val = (u32)po->fanout->id | ((u32)po->fanout->type << 16);
+                ret = nla_put_u32(nlskb, PACKET_DIAG_FANOUT, val);
+        }
+        mutex_unlock(&fanout_mutex);
+
+        return ret;
+}
+
+static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct packet_diag_req *req,
+                u32 portid, u32 seq, u32 flags, int sk_ino)
+{
+        struct nlmsghdr *nlh;
+        struct packet_diag_msg *rp;
+        struct packet_sock *po = pkt_sk(sk);
+
+        nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rp), flags);
+        if (!nlh)
+                return -EMSGSIZE;
+
+        rp = nlmsg_data(nlh);
+        rp->pdiag_family = AF_PACKET;
+        rp->pdiag_type = sk->sk_type;
+        rp->pdiag_num = ntohs(po->num);
+        rp->pdiag_ino = sk_ino;
+        sock_diag_save_cookie(sk, rp->pdiag_cookie);
+
+        if ((req->pdiag_show & PACKET_SHOW_INFO) &&
+                        pdiag_put_info(po, skb))
+                goto out_nlmsg_trim;
+
+        if ((req->pdiag_show & PACKET_SHOW_MCLIST) &&
+                        pdiag_put_mclist(po, skb))
+                goto out_nlmsg_trim;
+
+        if ((req->pdiag_show & PACKET_SHOW_RING_CFG) &&
+                        pdiag_put_rings_cfg(po, skb))
+                goto out_nlmsg_trim;
+
+        if ((req->pdiag_show & PACKET_SHOW_FANOUT) &&
+                        pdiag_put_fanout(po, skb))
+                goto out_nlmsg_trim;
+
+        return nlmsg_end(skb, nlh);
+
+out_nlmsg_trim:
+        nlmsg_cancel(skb, nlh);
+        return -EMSGSIZE;
+}
+
+static int packet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+        int num = 0, s_num = cb->args[0];
+        struct packet_diag_req *req;
+        struct net *net;
+        struct sock *sk;
+        struct hlist_node *node;
+
+        net = sock_net(skb->sk);
+        req = nlmsg_data(cb->nlh);
+
+        mutex_lock(&net->packet.sklist_lock);
+        sk_for_each(sk, node, &net->packet.sklist) {
+                if (!net_eq(sock_net(sk), net))
+                        continue;
+                if (num < s_num)
+                        goto next;
+
+                if (sk_diag_fill(sk, skb, req, NETLINK_CB(cb->skb).portid,
+                                        cb->nlh->nlmsg_seq, NLM_F_MULTI,
+                                        sock_i_ino(sk)) < 0)
+                        goto done;
+next:
+                num++;
+        }
+done:
+        mutex_unlock(&net->packet.sklist_lock);
+        cb->args[0] = num;
+
+        return skb->len;
+}
+
+static int packet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
+{
+        int hdrlen = sizeof(struct packet_diag_req);
+        struct net *net = sock_net(skb->sk);
+        struct packet_diag_req *req;
+
+        if (nlmsg_len(h) < hdrlen)
+                return -EINVAL;
+
+        req = nlmsg_data(h);
+        /* Make it possible to support protocol filtering later */
+        if (req->sdiag_protocol)
+                return -EINVAL;
+
+        if (h->nlmsg_flags & NLM_F_DUMP) {
+                struct netlink_dump_control c = {
+                        .dump = packet_diag_dump,
+                };
+                return netlink_dump_start(net->diag_nlsk, skb, h, &c);
+        } else
+                return -EOPNOTSUPP;
+}
+
+static const struct sock_diag_handler packet_diag_handler = {
+        .family = AF_PACKET,
+        .dump = packet_diag_handler_dump,
+};
+
+static int __init packet_diag_init(void)
+{
+        return sock_diag_register(&packet_diag_handler);
+}
+
+static void __exit packet_diag_exit(void)
+{
+        sock_diag_unregister(&packet_diag_handler);
+}
+
+module_init(packet_diag_init);
+module_exit(packet_diag_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 17 /* AF_PACKET */);