430 lines
10 KiB
C
430 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Multipath TCP
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*
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* Copyright (c) 2022, Intel Corporation.
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*/
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#include "protocol.h"
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void mptcp_free_local_addr_list(struct mptcp_sock *msk)
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{
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struct mptcp_pm_addr_entry *entry, *tmp;
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struct sock *sk = (struct sock *)msk;
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LIST_HEAD(free_list);
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if (!mptcp_pm_is_userspace(msk))
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return;
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spin_lock_bh(&msk->pm.lock);
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list_splice_init(&msk->pm.userspace_pm_local_addr_list, &free_list);
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spin_unlock_bh(&msk->pm.lock);
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list_for_each_entry_safe(entry, tmp, &free_list, list) {
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sock_kfree_s(sk, entry, sizeof(*entry));
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}
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}
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int mptcp_userspace_pm_append_new_local_addr(struct mptcp_sock *msk,
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struct mptcp_pm_addr_entry *entry)
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{
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DECLARE_BITMAP(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
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struct mptcp_pm_addr_entry *match = NULL;
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struct sock *sk = (struct sock *)msk;
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struct mptcp_pm_addr_entry *e;
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bool addr_match = false;
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bool id_match = false;
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int ret = -EINVAL;
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bitmap_zero(id_bitmap, MPTCP_PM_MAX_ADDR_ID + 1);
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spin_lock_bh(&msk->pm.lock);
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list_for_each_entry(e, &msk->pm.userspace_pm_local_addr_list, list) {
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addr_match = mptcp_addresses_equal(&e->addr, &entry->addr, true);
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if (addr_match && entry->addr.id == 0)
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entry->addr.id = e->addr.id;
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id_match = (e->addr.id == entry->addr.id);
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if (addr_match && id_match) {
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match = e;
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break;
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} else if (addr_match || id_match) {
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break;
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}
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__set_bit(e->addr.id, id_bitmap);
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}
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if (!match && !addr_match && !id_match) {
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/* Memory for the entry is allocated from the
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* sock option buffer.
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*/
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e = sock_kmalloc(sk, sizeof(*e), GFP_ATOMIC);
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if (!e) {
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spin_unlock_bh(&msk->pm.lock);
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return -ENOMEM;
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}
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*e = *entry;
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if (!e->addr.id)
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e->addr.id = find_next_zero_bit(id_bitmap,
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MPTCP_PM_MAX_ADDR_ID + 1,
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1);
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list_add_tail_rcu(&e->list, &msk->pm.userspace_pm_local_addr_list);
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ret = e->addr.id;
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} else if (match) {
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ret = entry->addr.id;
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}
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spin_unlock_bh(&msk->pm.lock);
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return ret;
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}
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int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
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unsigned int id,
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u8 *flags, int *ifindex)
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{
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struct mptcp_pm_addr_entry *entry, *match = NULL;
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*flags = 0;
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*ifindex = 0;
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spin_lock_bh(&msk->pm.lock);
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list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
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if (id == entry->addr.id) {
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match = entry;
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break;
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}
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}
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spin_unlock_bh(&msk->pm.lock);
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if (match) {
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*flags = match->flags;
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*ifindex = match->ifindex;
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}
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return 0;
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}
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int mptcp_userspace_pm_get_local_id(struct mptcp_sock *msk,
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struct mptcp_addr_info *skc)
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{
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struct mptcp_pm_addr_entry new_entry;
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__be16 msk_sport = ((struct inet_sock *)
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inet_sk((struct sock *)msk))->inet_sport;
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memset(&new_entry, 0, sizeof(struct mptcp_pm_addr_entry));
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new_entry.addr = *skc;
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new_entry.addr.id = 0;
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new_entry.flags = MPTCP_PM_ADDR_FLAG_IMPLICIT;
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if (new_entry.addr.port == msk_sport)
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new_entry.addr.port = 0;
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return mptcp_userspace_pm_append_new_local_addr(msk, &new_entry);
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}
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int mptcp_nl_cmd_announce(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
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struct nlattr *addr = info->attrs[MPTCP_PM_ATTR_ADDR];
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struct mptcp_pm_addr_entry addr_val;
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struct mptcp_sock *msk;
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int err = -EINVAL;
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u32 token_val;
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if (!addr || !token) {
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GENL_SET_ERR_MSG(info, "missing required inputs");
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return err;
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}
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token_val = nla_get_u32(token);
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msk = mptcp_token_get_sock(sock_net(skb->sk), token_val);
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if (!msk) {
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NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
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return err;
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}
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if (!mptcp_pm_is_userspace(msk)) {
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GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
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goto announce_err;
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}
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err = mptcp_pm_parse_entry(addr, info, true, &addr_val);
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if (err < 0) {
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GENL_SET_ERR_MSG(info, "error parsing local address");
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goto announce_err;
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}
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if (addr_val.addr.id == 0 || !(addr_val.flags & MPTCP_PM_ADDR_FLAG_SIGNAL)) {
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GENL_SET_ERR_MSG(info, "invalid addr id or flags");
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goto announce_err;
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}
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err = mptcp_userspace_pm_append_new_local_addr(msk, &addr_val);
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if (err < 0) {
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GENL_SET_ERR_MSG(info, "did not match address and id");
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goto announce_err;
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}
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lock_sock((struct sock *)msk);
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spin_lock_bh(&msk->pm.lock);
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if (mptcp_pm_alloc_anno_list(msk, &addr_val)) {
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mptcp_pm_announce_addr(msk, &addr_val.addr, false);
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mptcp_pm_nl_addr_send_ack(msk);
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}
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spin_unlock_bh(&msk->pm.lock);
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release_sock((struct sock *)msk);
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err = 0;
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announce_err:
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sock_put((struct sock *)msk);
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return err;
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}
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int mptcp_nl_cmd_remove(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
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struct nlattr *id = info->attrs[MPTCP_PM_ATTR_LOC_ID];
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struct mptcp_pm_addr_entry *match = NULL;
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struct mptcp_pm_addr_entry *entry;
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struct mptcp_sock *msk;
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LIST_HEAD(free_list);
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int err = -EINVAL;
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u32 token_val;
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u8 id_val;
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if (!id || !token) {
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GENL_SET_ERR_MSG(info, "missing required inputs");
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return err;
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}
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id_val = nla_get_u8(id);
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token_val = nla_get_u32(token);
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msk = mptcp_token_get_sock(sock_net(skb->sk), token_val);
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if (!msk) {
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NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
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return err;
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}
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if (!mptcp_pm_is_userspace(msk)) {
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GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
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goto remove_err;
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}
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lock_sock((struct sock *)msk);
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list_for_each_entry(entry, &msk->pm.userspace_pm_local_addr_list, list) {
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if (entry->addr.id == id_val) {
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match = entry;
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break;
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}
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}
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if (!match) {
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GENL_SET_ERR_MSG(info, "address with specified id not found");
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release_sock((struct sock *)msk);
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goto remove_err;
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}
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list_move(&match->list, &free_list);
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mptcp_pm_remove_addrs_and_subflows(msk, &free_list);
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release_sock((struct sock *)msk);
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list_for_each_entry_safe(match, entry, &free_list, list) {
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sock_kfree_s((struct sock *)msk, match, sizeof(*match));
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}
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err = 0;
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remove_err:
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sock_put((struct sock *)msk);
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return err;
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}
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int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
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struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
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struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
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struct mptcp_addr_info addr_r;
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struct mptcp_addr_info addr_l;
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struct mptcp_sock *msk;
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int err = -EINVAL;
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struct sock *sk;
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u32 token_val;
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if (!laddr || !raddr || !token) {
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GENL_SET_ERR_MSG(info, "missing required inputs");
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return err;
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}
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token_val = nla_get_u32(token);
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msk = mptcp_token_get_sock(genl_info_net(info), token_val);
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if (!msk) {
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NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
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return err;
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}
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if (!mptcp_pm_is_userspace(msk)) {
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GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
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goto create_err;
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}
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err = mptcp_pm_parse_addr(laddr, info, &addr_l);
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if (err < 0) {
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NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr");
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goto create_err;
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}
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if (addr_l.id == 0) {
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NL_SET_ERR_MSG_ATTR(info->extack, laddr, "missing local addr id");
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goto create_err;
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}
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err = mptcp_pm_parse_addr(raddr, info, &addr_r);
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if (err < 0) {
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NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr");
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goto create_err;
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}
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sk = &msk->sk.icsk_inet.sk;
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lock_sock(sk);
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err = __mptcp_subflow_connect(sk, &addr_l, &addr_r);
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release_sock(sk);
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create_err:
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sock_put((struct sock *)msk);
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return err;
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}
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static struct sock *mptcp_nl_find_ssk(struct mptcp_sock *msk,
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const struct mptcp_addr_info *local,
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const struct mptcp_addr_info *remote)
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{
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struct sock *sk = &msk->sk.icsk_inet.sk;
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struct mptcp_subflow_context *subflow;
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struct sock *found = NULL;
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if (local->family != remote->family)
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return NULL;
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lock_sock(sk);
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mptcp_for_each_subflow(msk, subflow) {
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const struct inet_sock *issk;
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struct sock *ssk;
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ssk = mptcp_subflow_tcp_sock(subflow);
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if (local->family != ssk->sk_family)
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continue;
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issk = inet_sk(ssk);
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switch (ssk->sk_family) {
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case AF_INET:
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if (issk->inet_saddr != local->addr.s_addr ||
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issk->inet_daddr != remote->addr.s_addr)
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continue;
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break;
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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case AF_INET6: {
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const struct ipv6_pinfo *pinfo = inet6_sk(ssk);
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if (!ipv6_addr_equal(&local->addr6, &pinfo->saddr) ||
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!ipv6_addr_equal(&remote->addr6, &ssk->sk_v6_daddr))
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continue;
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break;
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}
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#endif
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default:
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continue;
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}
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if (issk->inet_sport == local->port &&
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issk->inet_dport == remote->port) {
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found = ssk;
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goto found;
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}
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}
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found:
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release_sock(sk);
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return found;
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}
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int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info)
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{
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struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
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struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
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struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
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struct mptcp_addr_info addr_l;
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struct mptcp_addr_info addr_r;
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struct mptcp_sock *msk;
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struct sock *sk, *ssk;
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int err = -EINVAL;
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u32 token_val;
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if (!laddr || !raddr || !token) {
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GENL_SET_ERR_MSG(info, "missing required inputs");
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return err;
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}
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token_val = nla_get_u32(token);
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msk = mptcp_token_get_sock(genl_info_net(info), token_val);
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if (!msk) {
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NL_SET_ERR_MSG_ATTR(info->extack, token, "invalid token");
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return err;
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}
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if (!mptcp_pm_is_userspace(msk)) {
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GENL_SET_ERR_MSG(info, "invalid request; userspace PM not selected");
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goto destroy_err;
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}
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err = mptcp_pm_parse_addr(laddr, info, &addr_l);
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if (err < 0) {
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NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr");
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goto destroy_err;
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}
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err = mptcp_pm_parse_addr(raddr, info, &addr_r);
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if (err < 0) {
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NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr");
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goto destroy_err;
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}
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if (addr_l.family != addr_r.family) {
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GENL_SET_ERR_MSG(info, "address families do not match");
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goto destroy_err;
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}
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if (!addr_l.port || !addr_r.port) {
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GENL_SET_ERR_MSG(info, "missing local or remote port");
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goto destroy_err;
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}
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sk = &msk->sk.icsk_inet.sk;
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ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r);
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if (ssk) {
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struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
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mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN);
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mptcp_close_ssk(sk, ssk, subflow);
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err = 0;
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} else {
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err = -ESRCH;
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}
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destroy_err:
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sock_put((struct sock *)msk);
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return err;
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}
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