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// SPDX-License-Identifier: GPL-2.0
/* Multipath TCP
*
* Copyright (c) 2022, Intel Corporation.
*/
#include "protocol.h"
void mptcp_free_local_addr_list(struct mptcp_sock *msk)
{
struct mptcp_pm_addr_entry *entry, *tmp;
struct sock *sk = (struct sock *)msk;
LIST_HEAD(free_list);
if (!mptcp_pm_is_userspace(msk))
return;
spin_lock_bh(&msk->pm.lock);
list_splice_init(&msk->pm.userspace_pm_local_addr_list, &free_list);
spin_unlock_bh(&msk->pm.lock);
list_for_each_entry_safe(entry, tmp, &free_list, list) {
sock_kfree_s(sk, entry, sizeof(*entry));
}
}
int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
struct mptcp_pm_addr_entry *entry)
{
DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
struct mptcp_pm_addr_entry *match = NULL;
struct sock *sk = (struct sock *)msk;
struct mptcp_pm_addr_entry *e;
bool addr_match = false;
bool id_match = false;
int ret = -EINVAL;
bitmap_zero(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
spin_lock_bh(&msk->pm.lock);
list_for_each_entry(e, &msk->pm.userspace_pm_local_addr_list, list) {
addr_match = mptcp_addresses_equal(&e->addr, &entry->addr, true);
if (addr_match && entry->addr.id == 0)
entry->addr.id = e->addr.id;
id_match = (e->addr.id == entry->addr.id);
if (addr_match && id_match) {
match = e;
break;
} else if (addr_match || id_match) {
break;
}
__set_bit(e->addr.id, id_bitmap);
}
if (!match && !addr_match && !id_match) {
/* Memory for the entry is allocated from the
* sock option buffer.
*/
e = sock_kmalloc(sk, sizeof(*e), GFP_ATOMIC);
if (!e) {
spin_unlock_bh(&msk->pm.lock);
return -ENOMEM;
}
*e = *entry;
if (!e->addr.id)
e->addr.id = find_next_zero_bit(id_bitmap,
MPTCP_PM_MAX_ADDR_ID + 1,
1);
list_add_tail_rcu(&e->list, &msk->pm.userspace_pm_local_addr_list);
ret = e->addr.id;
} else if (match) {
ret = entry->addr.id;
}
spin_unlock_bh(&msk->pm.lock);
return ret;
}
int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
unsigned int id,
u8 *flags, int *ifindex)
{
struct mptcp_pm_addr_entry *entry, *match = NULL;
*flags = 0;
*ifindex = 0;
spin_lock_bh(&msk->pm.lock);
list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
if (id == entry->addr.id) {
match = entry;
break;
}
}
spin_unlock_bh(&msk->pm.lock);
if (match) {
*flags = match->flags;
*ifindex = match->ifindex;
}
return 0;
}
int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk,
struct mptcp_addr_info *skc)
{
struct mptcp_pm_addr_entry new_entry;
__be16 msk_sport = ((struct inet_sock *)
inet_sk((struct sock *)msk))->inet_sport;
memset(&new_entry, 0, sizeof(struct mptcp_pm_addr_entry));
new_entry.addr = *skc;
new_entry.addr.id = 0;
new_entry.flags = MPTCP_PM_ADDR_FLAG_IMPLICIT;
if (new_entry.addr.port == msk_sport)
new_entry.addr.port = 0;
return mptcp_userspace_pm_append_new_local_addr(msk, &new_entry);
}
int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
struct nlattr *addr = info->attrs[MPTCP_PM_ATTR_ADDR];
struct mptcp_pm_addr_entry addr_val;
struct mptcp_sock *msk;
int err = -EINVAL;
u32 token_val;
if (!addr || !token) {
GENL_SET_ERR_MSG(info, "missing required inputs");
return err;
}
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 announce_err;
}
err = mptcp_pm_parse_entry(addr, info, true, &addr_val);
if (err < 0) {
GENL_SET_ERR_MSG(info, "error parsing local address");
goto announce_err;
}
if (addr_val.addr.id == 0 || !(addr_val.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
GENL_SET_ERR_MSG(info, "invalid addr id or flags");
goto announce_err;
}
err = mptcp_userspace_pm_append_new_local_addr(msk, &addr_val);
if (err < 0) {
GENL_SET_ERR_MSG(info, "did not match address and id");
goto announce_err;
}
lock_sock((struct sock *)msk);
spin_lock_bh(&msk->pm.lock);
if (mptcp_pm_alloc_anno_list(msk, &addr_val)) {
mptcp_pm_announce_addr(msk, &addr_val.addr, false);
mptcp_pm_nl_addr_send_ack(msk);
}
spin_unlock_bh(&msk->pm.lock);
release_sock((struct sock *)msk);
err = 0;
announce_err:
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;
}
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