2013-03-21 10:33:48 -06:00
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#include <linux/module.h>
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#include <net/sock.h>
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#include <linux/netlink.h>
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#include <linux/sock_diag.h>
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#include <linux/netlink_diag.h>
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2014-08-02 03:47:45 -06:00
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#include <linux/rhashtable.h>
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2013-03-21 10:33:48 -06:00
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#include "af_netlink.h"
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2013-04-23 13:39:03 -06:00
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#ifdef CONFIG_NETLINK_MMAP
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2013-04-17 00:47:06 -06:00
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static int sk_diag_put_ring(struct netlink_ring *ring, int nl_type,
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struct sk_buff *nlskb)
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{
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struct netlink_diag_ring ndr;
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ndr.ndr_block_size = ring->pg_vec_pages << PAGE_SHIFT;
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ndr.ndr_block_nr = ring->pg_vec_len;
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ndr.ndr_frame_size = ring->frame_size;
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ndr.ndr_frame_nr = ring->frame_max + 1;
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return nla_put(nlskb, nl_type, sizeof(ndr), &ndr);
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}
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static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb)
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{
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struct netlink_sock *nlk = nlk_sk(sk);
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int ret;
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mutex_lock(&nlk->pg_vec_lock);
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ret = sk_diag_put_ring(&nlk->rx_ring, NETLINK_DIAG_RX_RING, nlskb);
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if (!ret)
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ret = sk_diag_put_ring(&nlk->tx_ring, NETLINK_DIAG_TX_RING,
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nlskb);
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mutex_unlock(&nlk->pg_vec_lock);
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return ret;
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}
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2013-04-23 13:39:03 -06:00
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#else
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static int sk_diag_put_rings_cfg(struct sock *sk, struct sk_buff *nlskb)
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{
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return 0;
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}
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#endif
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2013-04-17 00:47:06 -06:00
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2013-03-21 10:33:48 -06:00
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static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb)
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{
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struct netlink_sock *nlk = nlk_sk(sk);
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if (nlk->groups == NULL)
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return 0;
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return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
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nlk->groups);
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}
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static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
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struct netlink_diag_req *req,
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u32 portid, u32 seq, u32 flags, int sk_ino)
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{
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struct nlmsghdr *nlh;
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struct netlink_diag_msg *rep;
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struct netlink_sock *nlk = nlk_sk(sk);
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nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
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flags);
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if (!nlh)
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return -EMSGSIZE;
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rep = nlmsg_data(nlh);
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rep->ndiag_family = AF_NETLINK;
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rep->ndiag_type = sk->sk_type;
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rep->ndiag_protocol = sk->sk_protocol;
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rep->ndiag_state = sk->sk_state;
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rep->ndiag_ino = sk_ino;
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rep->ndiag_portid = nlk->portid;
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rep->ndiag_dst_portid = nlk->dst_portid;
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rep->ndiag_dst_group = nlk->dst_group;
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sock_diag_save_cookie(sk, rep->ndiag_cookie);
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if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
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sk_diag_dump_groups(sk, skb))
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goto out_nlmsg_trim;
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if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
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sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
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goto out_nlmsg_trim;
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2013-04-17 00:47:06 -06:00
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if ((req->ndiag_show & NDIAG_SHOW_RING_CFG) &&
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sk_diag_put_rings_cfg(sk, skb))
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goto out_nlmsg_trim;
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2015-01-16 14:09:00 -07:00
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nlmsg_end(skb, nlh);
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return 0;
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2013-03-21 10:33:48 -06:00
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out_nlmsg_trim:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
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int protocol, int s_num)
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{
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struct netlink_table *tbl = &nl_table[protocol];
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2014-08-02 03:47:45 -06:00
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struct rhashtable *ht = &tbl->hash;
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2015-01-11 23:52:23 -07:00
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const struct bucket_table *htbl = rht_dereference_rcu(ht->tbl, ht);
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2013-03-21 10:33:48 -06:00
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struct net *net = sock_net(skb->sk);
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struct netlink_diag_req *req;
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2014-08-02 03:47:45 -06:00
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struct netlink_sock *nlsk;
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2013-03-21 10:33:48 -06:00
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struct sock *sk;
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int ret = 0, num = 0, i;
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req = nlmsg_data(cb->nlh);
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2014-08-02 03:47:45 -06:00
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for (i = 0; i < htbl->size; i++) {
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2015-01-02 15:00:16 -07:00
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struct rhash_head *pos;
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2015-01-11 23:52:23 -07:00
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rht_for_each_entry_rcu(nlsk, pos, htbl, i, node) {
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2014-08-02 03:47:45 -06:00
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sk = (struct sock *)nlsk;
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2013-03-21 10:33:48 -06:00
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if (!net_eq(sock_net(sk), net))
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continue;
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if (num < s_num) {
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num++;
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continue;
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}
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if (sk_diag_fill(sk, skb, req,
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq,
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NLM_F_MULTI,
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sock_i_ino(sk)) < 0) {
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ret = 1;
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goto done;
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}
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num++;
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}
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}
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sk_for_each_bound(sk, &tbl->mc_list) {
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if (sk_hashed(sk))
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continue;
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if (!net_eq(sock_net(sk), net))
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continue;
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if (num < s_num) {
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num++;
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continue;
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}
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if (sk_diag_fill(sk, skb, req,
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NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq,
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NLM_F_MULTI,
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sock_i_ino(sk)) < 0) {
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ret = 1;
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goto done;
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}
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num++;
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}
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done:
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cb->args[0] = num;
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cb->args[1] = protocol;
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return ret;
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}
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static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct netlink_diag_req *req;
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int s_num = cb->args[0];
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req = nlmsg_data(cb->nlh);
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2015-01-11 23:52:23 -07:00
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rcu_read_lock();
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2013-03-21 10:33:48 -06:00
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read_lock(&nl_table_lock);
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if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
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int i;
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for (i = cb->args[1]; i < MAX_LINKS; i++) {
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if (__netlink_diag_dump(skb, cb, i, s_num))
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break;
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s_num = 0;
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}
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} else {
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if (req->sdiag_protocol >= MAX_LINKS) {
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read_unlock(&nl_table_lock);
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2015-01-11 23:52:23 -07:00
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rcu_read_unlock();
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2013-03-21 10:33:48 -06:00
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return -ENOENT;
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}
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__netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
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}
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read_unlock(&nl_table_lock);
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2015-01-11 23:52:23 -07:00
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rcu_read_unlock();
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2013-03-21 10:33:48 -06:00
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return skb->len;
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}
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static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
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{
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int hdrlen = sizeof(struct netlink_diag_req);
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struct net *net = sock_net(skb->sk);
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if (nlmsg_len(h) < hdrlen)
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return -EINVAL;
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if (h->nlmsg_flags & NLM_F_DUMP) {
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struct netlink_dump_control c = {
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.dump = netlink_diag_dump,
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};
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return netlink_dump_start(net->diag_nlsk, skb, h, &c);
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} else
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return -EOPNOTSUPP;
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}
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static const struct sock_diag_handler netlink_diag_handler = {
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.family = AF_NETLINK,
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.dump = netlink_diag_handler_dump,
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};
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static int __init netlink_diag_init(void)
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{
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return sock_diag_register(&netlink_diag_handler);
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}
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static void __exit netlink_diag_exit(void)
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{
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sock_diag_unregister(&netlink_diag_handler);
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}
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module_init(netlink_diag_init);
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module_exit(netlink_diag_exit);
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);
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