netlink: Diag core and basic socket info dumping (v2)
The netlink_diag can be built as a module, just like it's done in unix sockets. The core dumping message carries the basic info about netlink sockets: family, type and protocol, portis, dst_group, dst_portid, state. Groups can be received as an optional parameter NETLINK_DIAG_GROUPS. Netlink sockets cab be filtered by protocols. The socket inode number and cookie is reserved for future per-socket info retrieving. The per-protocol filtering is also reserved for future by requiring the sdiag_protocol to be zero. The file /proc/net/netlink doesn't provide enough information for dumping netlink sockets. It doesn't provide dst_group, dst_portid, groups above 32. v2: fix NETLINK_DIAG_MAX. Now it's equal to the last constant. Acked-by: Pavel Emelyanov <xemul@parallels.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Eric Dumazet <edumazet@google.com> Cc: Pablo Neira Ayuso <pablo@netfilter.org> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Gao feng <gaofeng@cn.fujitsu.com> Cc: Thomas Graf <tgraf@suug.ch> Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andrey Vagin
David S. Miller
parent
0f29c76864
commit
eaaa313926
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@ -0,0 +1,42 @@
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#ifndef __NETLINK_DIAG_H__
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#define __NETLINK_DIAG_H__
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#include <linux/types.h>
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struct netlink_diag_req {
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__u8 sdiag_family;
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__u8 sdiag_protocol;
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__u16 pad;
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__u32 ndiag_ino;
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__u32 ndiag_show;
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__u32 ndiag_cookie[2];
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};
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struct netlink_diag_msg {
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__u8 ndiag_family;
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__u8 ndiag_type;
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__u8 ndiag_protocol;
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__u8 ndiag_state;
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__u32 ndiag_portid;
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__u32 ndiag_dst_portid;
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__u32 ndiag_dst_group;
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__u32 ndiag_ino;
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__u32 ndiag_cookie[2];
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};
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enum {
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NETLINK_DIAG_MEMINFO,
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NETLINK_DIAG_GROUPS,
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__NETLINK_DIAG_MAX,
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};
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#define NETLINK_DIAG_MAX (__NETLINK_DIAG_MAX - 1)
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#define NDIAG_PROTO_ALL ((__u8) ~0)
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#define NDIAG_SHOW_MEMINFO 0x00000001 /* show memory info of a socket */
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#define NDIAG_SHOW_GROUPS 0x00000002 /* show groups of a netlink socket */
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#endif
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@ -217,6 +217,7 @@ source "net/dns_resolver/Kconfig"
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source "net/batman-adv/Kconfig"
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source "net/openvswitch/Kconfig"
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source "net/vmw_vsock/Kconfig"
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source "net/netlink/Kconfig"
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config RPS
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boolean
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@ -0,0 +1,10 @@
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#
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# Netlink Sockets
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#
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config NETLINK_DIAG
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tristate "NETLINK: socket monitoring interface"
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default n
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---help---
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Support for NETLINK socket monitoring interface used by the ss tool.
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If unsure, say Y.
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@ -3,3 +3,6 @@
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#
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obj-y := af_netlink.o genetlink.o
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obj-$(CONFIG_NETLINK_DIAG) += netlink_diag.o
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netlink_diag-y := diag.o
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@ -0,0 +1,188 @@
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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 "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_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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return nlmsg_end(skb, nlh);
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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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struct nl_portid_hash *hash = &tbl->hash;
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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 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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for (i = 0; i <= hash->mask; i++) {
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sk_for_each(sk, &hash->table[i]) {
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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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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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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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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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