Commit 67c8e4bb authored by Justin Iurman's avatar Justin Iurman Committed by David S. Miller
Browse files

net: ioam6: multicast event 



Add a multicast group to the ioam6 generic netlink family and provide
ioam6_event() to send an ioam6 event to the multicast group.

Reviewed-by: default avatarDavid Ahern <dsahern@kernel.org>
Signed-off-by: default avatarJustin Iurman <justin.iurman@uliege.be>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 5fa918a3

include/net/ioam6.h

+4 −0
Original line number Diff line number Diff line
@@ -12,6 +12,7 @@ 
#include <linux/net.h>

#include <linux/ipv6.h>

#include <linux/ioam6.h>

#include <linux/ioam6_genl.h>

#include <linux/rhashtable-types.h>



struct ioam6_namespace {
@@ -65,4 +66,7 @@ void ioam6_exit(void); 
int ioam6_iptunnel_init(void);

void ioam6_iptunnel_exit(void);



void ioam6_event(enum ioam6_event_type type, struct net *net, gfp_t gfp,

		 void *opt, unsigned int opt_len);



#endif /* _NET_IOAM6_H */

net/ipv6/ioam6.c

+64 −0
Original line number Diff line number Diff line
@@ -612,6 +612,68 @@ static const struct genl_ops ioam6_genl_ops[] = { 
	},

};



#define IOAM6_GENL_EV_GRP_OFFSET 0



static const struct genl_multicast_group ioam6_mcgrps[] = {

	[IOAM6_GENL_EV_GRP_OFFSET] = { .name = IOAM6_GENL_EV_GRP_NAME,

				       .flags = GENL_MCAST_CAP_NET_ADMIN },

};



static int ioam6_event_put_trace(struct sk_buff *skb,

				 struct ioam6_trace_hdr *trace,

				 unsigned int len)

{

	if (nla_put_u16(skb, IOAM6_EVENT_ATTR_TRACE_NAMESPACE,

			be16_to_cpu(trace->namespace_id)) ||

	    nla_put_u8(skb, IOAM6_EVENT_ATTR_TRACE_NODELEN, trace->nodelen) ||

	    nla_put_u32(skb, IOAM6_EVENT_ATTR_TRACE_TYPE,

			be32_to_cpu(trace->type_be32)) ||

	    nla_put(skb, IOAM6_EVENT_ATTR_TRACE_DATA,

		    len - sizeof(struct ioam6_trace_hdr) - trace->remlen * 4,

		    trace->data + trace->remlen * 4))

		return 1;



	return 0;

}



void ioam6_event(enum ioam6_event_type type, struct net *net, gfp_t gfp,

		 void *opt, unsigned int opt_len)

{

	struct nlmsghdr *nlh;

	struct sk_buff *skb;



	if (!genl_has_listeners(&ioam6_genl_family, net,

				IOAM6_GENL_EV_GRP_OFFSET))

		return;



	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);

	if (!skb)

		return;



	nlh = genlmsg_put(skb, 0, 0, &ioam6_genl_family, 0, type);

	if (!nlh)

		goto nla_put_failure;



	switch (type) {

	case IOAM6_EVENT_UNSPEC:

		WARN_ON_ONCE(1);

		break;

	case IOAM6_EVENT_TRACE:

		if (ioam6_event_put_trace(skb, (struct ioam6_trace_hdr *)opt,

					  opt_len))

			goto nla_put_failure;

		break;

	}



	genlmsg_end(skb, nlh);

	genlmsg_multicast_netns(&ioam6_genl_family, net, skb, 0,

				IOAM6_GENL_EV_GRP_OFFSET, gfp);

	return;



nla_put_failure:

	nlmsg_free(skb);

}



static struct genl_family ioam6_genl_family __ro_after_init = {

	.name		= IOAM6_GENL_NAME,

	.version	= IOAM6_GENL_VERSION,
@@ -620,6 +682,8 @@ static struct genl_family ioam6_genl_family __ro_after_init = { 
	.ops		= ioam6_genl_ops,

	.n_ops		= ARRAY_SIZE(ioam6_genl_ops),

	.resv_start_op	= IOAM6_CMD_NS_SET_SCHEMA + 1,

	.mcgrps		= ioam6_mcgrps,

	.n_mcgrps	= ARRAY_SIZE(ioam6_mcgrps),

	.module		= THIS_MODULE,

};