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packet: Report socket mclist info via diag module

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The info is reported as an array of packet_diag_mclist structures. Each
includes not only the directly configured values (index, type, etc), but
also the "count".

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2012-08-13 05:57:44 +00:00 committed by David S. Miller
parent 8a360be0c5
commit eea68e2f1a
2 changed files with 49 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

10
include/linux/packet_diag.h
View file

@ -13,6 +13,7 @@ struct packet_diag_req {
};
#define PACKET_SHOW_INFO 0x00000001 /* Basic packet_sk information */
#define PACKET_SHOW_MCLIST 0x00000002 /* A set of packet_diag_mclist-s */
struct packet_diag_msg {
__u8 pdiag_family;
@ -25,6 +26,7 @@ struct packet_diag_msg {
enum {
PACKET_DIAG_INFO,
PACKET_DIAG_MCLIST,
PACKET_DIAG_MAX,
};
@ -44,4 +46,12 @@ struct packet_diag_info {
#define PDI_LOSS 0x10
};
struct packet_diag_mclist {
__u32 pdmc_index;
__u32 pdmc_count;
__u16 pdmc_type;
__u16 pdmc_alen;
__u8 pdmc_addr[MAX_ADDR_LEN];
};
#endif

39
net/packet/diag.c
View file

@ -1,6 +1,7 @@
#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>
@ -32,6 +33,40 @@ static int pdiag_put_info(const struct packet_sock *po, struct sk_buff *nlskb)
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 sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct packet_diag_req *req,
u32 pid, u32 seq, u32 flags, int sk_ino)
{
@ -54,6 +89,10 @@ static int sk_diag_fill(struct sock *sk, struct sk_buff *skb, struct packet_diag
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;
return nlmsg_end(skb, nlh);
out_nlmsg_trim: