v4.19.13 snapshot.
diff --git a/net/netlink/diag.c b/net/netlink/diag.c
new file mode 100644
index 0000000..7dda33b
--- /dev/null
+++ b/net/netlink/diag.c
@@ -0,0 +1,259 @@
+#include <linux/module.h>
+
+#include <net/sock.h>
+#include <linux/netlink.h>
+#include <linux/sock_diag.h>
+#include <linux/netlink_diag.h>
+#include <linux/rhashtable.h>
+
+#include "af_netlink.h"
+
+static int sk_diag_dump_groups(struct sock *sk, struct sk_buff *nlskb)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+
+ if (nlk->groups == NULL)
+ return 0;
+
+ return nla_put(nlskb, NETLINK_DIAG_GROUPS, NLGRPSZ(nlk->ngroups),
+ nlk->groups);
+}
+
+static int sk_diag_put_flags(struct sock *sk, struct sk_buff *skb)
+{
+ struct netlink_sock *nlk = nlk_sk(sk);
+ u32 flags = 0;
+
+ if (nlk->cb_running)
+ flags |= NDIAG_FLAG_CB_RUNNING;
+ if (nlk->flags & NETLINK_F_RECV_PKTINFO)
+ flags |= NDIAG_FLAG_PKTINFO;
+ if (nlk->flags & NETLINK_F_BROADCAST_SEND_ERROR)
+ flags |= NDIAG_FLAG_BROADCAST_ERROR;
+ if (nlk->flags & NETLINK_F_RECV_NO_ENOBUFS)
+ flags |= NDIAG_FLAG_NO_ENOBUFS;
+ if (nlk->flags & NETLINK_F_LISTEN_ALL_NSID)
+ flags |= NDIAG_FLAG_LISTEN_ALL_NSID;
+ if (nlk->flags & NETLINK_F_CAP_ACK)
+ flags |= NDIAG_FLAG_CAP_ACK;
+
+ return nla_put_u32(skb, NETLINK_DIAG_FLAGS, flags);
+}
+
+static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
+ struct netlink_diag_req *req,
+ u32 portid, u32 seq, u32 flags, int sk_ino)
+{
+ struct nlmsghdr *nlh;
+ struct netlink_diag_msg *rep;
+ struct netlink_sock *nlk = nlk_sk(sk);
+
+ nlh = nlmsg_put(skb, portid, seq, SOCK_DIAG_BY_FAMILY, sizeof(*rep),
+ flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ rep = nlmsg_data(nlh);
+ rep->ndiag_family = AF_NETLINK;
+ rep->ndiag_type = sk->sk_type;
+ rep->ndiag_protocol = sk->sk_protocol;
+ rep->ndiag_state = sk->sk_state;
+
+ rep->ndiag_ino = sk_ino;
+ rep->ndiag_portid = nlk->portid;
+ rep->ndiag_dst_portid = nlk->dst_portid;
+ rep->ndiag_dst_group = nlk->dst_group;
+ sock_diag_save_cookie(sk, rep->ndiag_cookie);
+
+ if ((req->ndiag_show & NDIAG_SHOW_GROUPS) &&
+ sk_diag_dump_groups(sk, skb))
+ goto out_nlmsg_trim;
+
+ if ((req->ndiag_show & NDIAG_SHOW_MEMINFO) &&
+ sock_diag_put_meminfo(sk, skb, NETLINK_DIAG_MEMINFO))
+ goto out_nlmsg_trim;
+
+ if ((req->ndiag_show & NDIAG_SHOW_FLAGS) &&
+ sk_diag_put_flags(sk, skb))
+ goto out_nlmsg_trim;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+
+out_nlmsg_trim:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+
+static int __netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
+ int protocol, int s_num)
+{
+ struct rhashtable_iter *hti = (void *)cb->args[2];
+ struct netlink_table *tbl = &nl_table[protocol];
+ struct net *net = sock_net(skb->sk);
+ struct netlink_diag_req *req;
+ struct netlink_sock *nlsk;
+ struct sock *sk;
+ int num = 2;
+ int ret = 0;
+
+ req = nlmsg_data(cb->nlh);
+
+ if (s_num > 1)
+ goto mc_list;
+
+ num--;
+
+ if (!hti) {
+ hti = kmalloc(sizeof(*hti), GFP_KERNEL);
+ if (!hti)
+ return -ENOMEM;
+
+ cb->args[2] = (long)hti;
+ }
+
+ if (!s_num)
+ rhashtable_walk_enter(&tbl->hash, hti);
+
+ rhashtable_walk_start(hti);
+
+ while ((nlsk = rhashtable_walk_next(hti))) {
+ if (IS_ERR(nlsk)) {
+ ret = PTR_ERR(nlsk);
+ if (ret == -EAGAIN) {
+ ret = 0;
+ continue;
+ }
+ break;
+ }
+
+ sk = (struct sock *)nlsk;
+
+ if (!net_eq(sock_net(sk), net))
+ continue;
+
+ if (sk_diag_fill(sk, skb, req,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ NLM_F_MULTI,
+ sock_i_ino(sk)) < 0) {
+ ret = 1;
+ break;
+ }
+ }
+
+ rhashtable_walk_stop(hti);
+
+ if (ret)
+ goto done;
+
+ rhashtable_walk_exit(hti);
+ num++;
+
+mc_list:
+ read_lock(&nl_table_lock);
+ sk_for_each_bound(sk, &tbl->mc_list) {
+ if (sk_hashed(sk))
+ continue;
+ if (!net_eq(sock_net(sk), net))
+ continue;
+ if (num < s_num) {
+ num++;
+ continue;
+ }
+
+ if (sk_diag_fill(sk, skb, req,
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq,
+ NLM_F_MULTI,
+ sock_i_ino(sk)) < 0) {
+ ret = 1;
+ break;
+ }
+ num++;
+ }
+ read_unlock(&nl_table_lock);
+
+done:
+ cb->args[0] = num;
+
+ return ret;
+}
+
+static int netlink_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct netlink_diag_req *req;
+ int s_num = cb->args[0];
+ int err = 0;
+
+ req = nlmsg_data(cb->nlh);
+
+ if (req->sdiag_protocol == NDIAG_PROTO_ALL) {
+ int i;
+
+ for (i = cb->args[1]; i < MAX_LINKS; i++) {
+ err = __netlink_diag_dump(skb, cb, i, s_num);
+ if (err)
+ break;
+ s_num = 0;
+ }
+ cb->args[1] = i;
+ } else {
+ if (req->sdiag_protocol >= MAX_LINKS)
+ return -ENOENT;
+
+ err = __netlink_diag_dump(skb, cb, req->sdiag_protocol, s_num);
+ }
+
+ return err < 0 ? err : skb->len;
+}
+
+static int netlink_diag_dump_done(struct netlink_callback *cb)
+{
+ struct rhashtable_iter *hti = (void *)cb->args[2];
+
+ if (cb->args[0] == 1)
+ rhashtable_walk_exit(hti);
+
+ kfree(hti);
+
+ return 0;
+}
+
+static int netlink_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
+{
+ int hdrlen = sizeof(struct netlink_diag_req);
+ struct net *net = sock_net(skb->sk);
+
+ if (nlmsg_len(h) < hdrlen)
+ return -EINVAL;
+
+ if (h->nlmsg_flags & NLM_F_DUMP) {
+ struct netlink_dump_control c = {
+ .dump = netlink_diag_dump,
+ .done = netlink_diag_dump_done,
+ };
+ return netlink_dump_start(net->diag_nlsk, skb, h, &c);
+ } else
+ return -EOPNOTSUPP;
+}
+
+static const struct sock_diag_handler netlink_diag_handler = {
+ .family = AF_NETLINK,
+ .dump = netlink_diag_handler_dump,
+};
+
+static int __init netlink_diag_init(void)
+{
+ return sock_diag_register(&netlink_diag_handler);
+}
+
+static void __exit netlink_diag_exit(void)
+{
+ sock_diag_unregister(&netlink_diag_handler);
+}
+
+module_init(netlink_diag_init);
+module_exit(netlink_diag_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 16 /* AF_NETLINK */);