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mptcp: netlink: Add MPTCP_PM_CMD_REMOVE

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This change adds a MPTCP netlink command for issuing a
REMOVE_ADDR signal for an address over the chosen MPTCP
connection from a userspace path manager.

The command requires the following parameters: {token, loc_id}.

Acked-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Kishen Maloor <kishen.maloor@intel.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Kishen Maloor 2022-05-03 19:38:54 -07:00 • committed by David S. Miller
parent 9a0b36509d
commit d9a4594eda
4 changed files with 76 additions and 2 deletions
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62
net/mptcp/pm_userspace.c
View file

@ -180,3 +180,65 @@ int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info)
sock_put((struct sock *)msk);
return err;
}
int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
struct nlattr *id = info->attrs[MPTCP_PM_ATTR_LOC_ID];
struct mptcp_pm_addr_entry *match = NULL;
struct mptcp_pm_addr_entry *entry;
struct mptcp_sock *msk;
LIST_HEAD(free_list);
int err = -EINVAL;
u32 token_val;
u8 id_val;
if (!id || !token) {
GENL_SET_ERR_MSG(info, "missing required inputs");
return err;
}
id_val = nla_get_u8(id);
token_val = nla_get_u32(token);
msk = mptcp_token_get_sock(sock_net(skb->sk), token_val);
if (!msk) {
NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
return err;
}
if (!mptcp_pm_is_userspace(msk)) {
GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
goto remove_err;
}
lock_sock((struct sock *)msk);
list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
if (entry->addr.id == id_val) {
match = entry;
break;
}
}
if (!match) {
GENL_SET_ERR_MSG(info, "address with specified id not found");
release_sock((struct sock *)msk);
goto remove_err;
}
list_move(&match->list, &free_list);
mptcp_pm_remove_addrs_and_subflows(msk, &free_list);
release_sock((struct sock *)msk);
list_for_each_entry_safe(match, entry, &free_list, list) {
sock_kfree_s((struct sock *)msk, match, sizeof(*match));
}
err = 0;
remove_err:
sock_put((struct sock *)msk);
return err;
}