6647b338fc
__netlink_diag_dump() returns 1 if the dump is not complete, zero if no error occurred. If err variable is zero, this means the dump is complete: We should not return skb->len in this case, but 0. This allows NLMSG_DONE to be appended to the skb. User space does not have to call us again only to get NLMSG_DONE. Signed-off-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Donald Hunter <donald.hunter@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
264 lines
5.6 KiB
C
264 lines
5.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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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#include <linux/rhashtable.h>
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#include "af_netlink.h"
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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_put_flags(struct sock *sk, struct sk_buff *skb)
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{
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struct netlink_sock *nlk = nlk_sk(sk);
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u32 flags = 0;
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if (nlk->cb_running)
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flags |= NDIAG_FLAG_CB_RUNNING;
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if (nlk_test_bit(RECV_PKTINFO, sk))
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flags |= NDIAG_FLAG_PKTINFO;
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if (nlk_test_bit(BROADCAST_SEND_ERROR, sk))
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flags |= NDIAG_FLAG_BROADCAST_ERROR;
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if (nlk_test_bit(RECV_NO_ENOBUFS, sk))
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flags |= NDIAG_FLAG_NO_ENOBUFS;
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if (nlk_test_bit(LISTEN_ALL_NSID, sk))
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flags |= NDIAG_FLAG_LISTEN_ALL_NSID;
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if (nlk_test_bit(CAP_ACK, sk))
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flags |= NDIAG_FLAG_CAP_ACK;
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return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags);
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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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if ((req->ndiag_show & NDIAG_SHOW_FLAGS) &&
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sk_diag_put_flags(sk, skb))
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goto out_nlmsg_trim;
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nlmsg_end(skb, nlh);
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return 0;
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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 rhashtable_iter *hti = (void *)cb->args[2];
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struct netlink_table *tbl = &nl_table[protocol];
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struct net *net = sock_net(skb->sk);
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struct netlink_diag_req *req;
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struct netlink_sock *nlsk;
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unsigned long flags;
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struct sock *sk;
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int num = 2;
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int ret = 0;
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req = nlmsg_data(cb->nlh);
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if (s_num > 1)
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goto mc_list;
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num--;
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if (!hti) {
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hti = kmalloc(sizeof(*hti), GFP_KERNEL);
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if (!hti)
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return -ENOMEM;
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cb->args[2] = (long)hti;
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}
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if (!s_num)
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rhashtable_walk_enter(&tbl->hash, hti);
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rhashtable_walk_start(hti);
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while ((nlsk = rhashtable_walk_next(hti))) {
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if (IS_ERR(nlsk)) {
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ret = PTR_ERR(nlsk);
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if (ret == -EAGAIN) {
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ret = 0;
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continue;
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}
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break;
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}
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sk = (struct sock *)nlsk;
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if (!net_eq(sock_net(sk), net))
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continue;
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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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break;
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}
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}
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rhashtable_walk_stop(hti);
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if (ret)
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goto done;
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rhashtable_walk_exit(hti);
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num++;
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mc_list:
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read_lock_irqsave(&nl_table_lock, flags);
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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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break;
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}
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num++;
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}
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read_unlock_irqrestore(&nl_table_lock, flags);
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done:
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cb->args[0] = num;
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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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int err = 0;
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req = nlmsg_data(cb->nlh);
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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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err = __netlink_diag_dump(skb, cb, i, s_num);
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if (err)
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break;
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s_num = 0;
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}
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cb->args[1] = i;
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} else {
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if (req->sdiag_protocol >= MAX_LINKS)
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return -ENOENT;
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err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
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}
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return err <= 0 ? err : skb->len;
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}
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static int netlink_diag_dump_done(struct netlink_callback *cb)
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{
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struct rhashtable_iter *hti = (void *)cb->args[2];
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if (cb->args[0] == 1)
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rhashtable_walk_exit(hti);
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kfree(hti);
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return 0;
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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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.done = netlink_diag_dump_done,
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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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.owner = THIS_MODULE,
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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_DESCRIPTION("Netlink-based socket monitoring/diagnostic interface (sock_diag)");
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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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