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l2tp : multicast notification to the registered listeners
Previously l2tp module did not provide any means for the user space to get notified when tunnels/sessions are added/modified/deleted. This change contains the following - create a multicast group for the listeners to register. - notify the registered listeners when the tunnels/sessions are created/modified/deleted. Signed-off-by: Bill Hong <bhong@brocade.com> Reviewed-by: Stephen Hemminger <stephen@networkplumber.org> Reviewed-by: Sven-Thorsten Dietrich <sven@brocade.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Bill Hong
David S. Miller
parent
957f094f22
commit
33f72e6f0c
@ -178,5 +178,6 @@ enum l2tp_seqmode {
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*/
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#define L2TP_GENL_NAME "l2tp"
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#define L2TP_GENL_VERSION 0x1
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#define L2TP_GENL_MCGROUP "l2tp"
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#endif /* _UAPI_LINUX_L2TP_H_ */
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@ -40,6 +40,18 @@ static struct genl_family l2tp_nl_family = {
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.netnsok = true,
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};
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static const struct genl_multicast_group l2tp_multicast_group[] = {
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{
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.name = L2TP_GENL_MCGROUP,
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},
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};
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static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq,
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int flags, struct l2tp_tunnel *tunnel, u8 cmd);
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static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq,
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int flags, struct l2tp_session *session,
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u8 cmd);
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/* Accessed under genl lock */
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static const struct l2tp_nl_cmd_ops *l2tp_nl_cmd_ops[__L2TP_PWTYPE_MAX];
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@ -97,6 +109,52 @@ out:
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return ret;
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}
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static int l2tp_tunnel_notify(struct genl_family *family,
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struct genl_info *info,
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struct l2tp_tunnel *tunnel,
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u8 cmd)
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{
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struct sk_buff *msg;
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int ret;
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
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NLM_F_ACK, tunnel, cmd);
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if (ret >= 0)
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return genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
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nlmsg_free(msg);
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return ret;
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}
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static int l2tp_session_notify(struct genl_family *family,
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struct genl_info *info,
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struct l2tp_session *session,
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u8 cmd)
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{
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struct sk_buff *msg;
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int ret;
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msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
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if (!msg)
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return -ENOMEM;
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ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
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NLM_F_ACK, session, cmd);
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if (ret >= 0)
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return genlmsg_multicast_allns(family, msg, 0, 0, GFP_ATOMIC);
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nlmsg_free(msg);
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return ret;
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}
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static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info)
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{
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u32 tunnel_id;
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@ -188,6 +246,9 @@ static int l2tp_nl_cmd_tunnel_create(struct sk_buff *skb, struct genl_info *info
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break;
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}
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if (ret >= 0)
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ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
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tunnel, L2TP_CMD_TUNNEL_CREATE);
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out:
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return ret;
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}
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@ -211,6 +272,9 @@ static int l2tp_nl_cmd_tunnel_delete(struct sk_buff *skb, struct genl_info *info
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goto out;
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}
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l2tp_tunnel_notify(&l2tp_nl_family, info,
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tunnel, L2TP_CMD_TUNNEL_DELETE);
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(void) l2tp_tunnel_delete(tunnel);
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out:
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@ -239,12 +303,15 @@ static int l2tp_nl_cmd_tunnel_modify(struct sk_buff *skb, struct genl_info *info
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if (info->attrs[L2TP_ATTR_DEBUG])
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tunnel->debug = nla_get_u32(info->attrs[L2TP_ATTR_DEBUG]);
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ret = l2tp_tunnel_notify(&l2tp_nl_family, info,
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tunnel, L2TP_CMD_TUNNEL_MODIFY);
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out:
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return ret;
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}
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static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
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struct l2tp_tunnel *tunnel)
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struct l2tp_tunnel *tunnel, u8 cmd)
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{
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void *hdr;
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struct nlattr *nest;
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@ -254,8 +321,7 @@ static int l2tp_nl_tunnel_send(struct sk_buff *skb, u32 portid, u32 seq, int fla
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struct ipv6_pinfo *np = NULL;
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#endif
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hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags,
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L2TP_CMD_TUNNEL_GET);
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hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
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if (!hdr)
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return -EMSGSIZE;
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@ -359,7 +425,7 @@ static int l2tp_nl_cmd_tunnel_get(struct sk_buff *skb, struct genl_info *info)
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}
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ret = l2tp_nl_tunnel_send(msg, info->snd_portid, info->snd_seq,
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NLM_F_ACK, tunnel);
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NLM_F_ACK, tunnel, L2TP_CMD_TUNNEL_GET);
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if (ret < 0)
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goto err_out;
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@ -385,7 +451,7 @@ static int l2tp_nl_cmd_tunnel_dump(struct sk_buff *skb, struct netlink_callback
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if (l2tp_nl_tunnel_send(skb, NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, NLM_F_MULTI,
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tunnel) <= 0)
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tunnel, L2TP_CMD_TUNNEL_GET) <= 0)
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goto out;
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ti++;
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@ -539,6 +605,13 @@ static int l2tp_nl_cmd_session_create(struct sk_buff *skb, struct genl_info *inf
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ret = (*l2tp_nl_cmd_ops[cfg.pw_type]->session_create)(net, tunnel_id,
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session_id, peer_session_id, &cfg);
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if (ret >= 0) {
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session = l2tp_session_find(net, tunnel, session_id);
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if (session)
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ret = l2tp_session_notify(&l2tp_nl_family, info, session,
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L2TP_CMD_SESSION_CREATE);
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}
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out:
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return ret;
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}
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@ -555,6 +628,9 @@ static int l2tp_nl_cmd_session_delete(struct sk_buff *skb, struct genl_info *inf
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goto out;
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}
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l2tp_session_notify(&l2tp_nl_family, info,
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session, L2TP_CMD_SESSION_DELETE);
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pw_type = session->pwtype;
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if (pw_type < __L2TP_PWTYPE_MAX)
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if (l2tp_nl_cmd_ops[pw_type] && l2tp_nl_cmd_ops[pw_type]->session_delete)
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@ -601,12 +677,15 @@ static int l2tp_nl_cmd_session_modify(struct sk_buff *skb, struct genl_info *inf
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if (info->attrs[L2TP_ATTR_MRU])
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session->mru = nla_get_u16(info->attrs[L2TP_ATTR_MRU]);
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ret = l2tp_session_notify(&l2tp_nl_family, info,
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session, L2TP_CMD_SESSION_MODIFY);
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out:
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return ret;
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}
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static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int flags,
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struct l2tp_session *session)
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struct l2tp_session *session, u8 cmd)
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{
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void *hdr;
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struct nlattr *nest;
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@ -615,7 +694,7 @@ static int l2tp_nl_session_send(struct sk_buff *skb, u32 portid, u32 seq, int fl
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sk = tunnel->sock;
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hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, L2TP_CMD_SESSION_GET);
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hdr = genlmsg_put(skb, portid, seq, &l2tp_nl_family, flags, cmd);
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if (!hdr)
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return -EMSGSIZE;
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@ -699,7 +778,7 @@ static int l2tp_nl_cmd_session_get(struct sk_buff *skb, struct genl_info *info)
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}
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ret = l2tp_nl_session_send(msg, info->snd_portid, info->snd_seq,
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0, session);
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0, session, L2TP_CMD_SESSION_GET);
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if (ret < 0)
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goto err_out;
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@ -737,7 +816,7 @@ static int l2tp_nl_cmd_session_dump(struct sk_buff *skb, struct netlink_callback
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if (l2tp_nl_session_send(skb, NETLINK_CB(cb->skb).portid,
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cb->nlh->nlmsg_seq, NLM_F_MULTI,
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session) <= 0)
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session, L2TP_CMD_SESSION_GET) <= 0)
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break;
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si++;
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@ -896,7 +975,9 @@ EXPORT_SYMBOL_GPL(l2tp_nl_unregister_ops);
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static int l2tp_nl_init(void)
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{
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pr_info("L2TP netlink interface\n");
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return genl_register_family_with_ops(&l2tp_nl_family, l2tp_nl_ops);
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return genl_register_family_with_ops_groups(&l2tp_nl_family,
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l2tp_nl_ops,
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l2tp_multicast_group);
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}
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static void l2tp_nl_cleanup(void)
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