linuxdebug/net/mptcp/pm_userspace.c

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2024-07-16 15:50:57 +02:00
// SPDX-License-Identifier: GPL-2.0
/* Multipath TCP
*
* Copyright (c) 2022, Intel Corporation.
*/
#include "protocol.h"
#include "mib.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);
msk->pm.local_addr_used++;
ret = e->addr.id;
} else if (match) {
ret = entry->addr.id;
}
spin_unlock_bh(&msk->pm.lock);
return ret;
}
/* If the subflow is closed from the other peer (not via a
* subflow destroy command then), we want to keep the entry
* not to assign the same ID to another address and to be
* able to send RM_ADDR after the removal of the subflow.
*/
static int mptcp_userspace_pm_delete_local_addr(struct mptcp_sock *msk,
struct mptcp_pm_addr_entry *addr)
{
struct mptcp_pm_addr_entry *entry, *tmp;
list_for_each_entry_safe(entry, tmp, &msk->pm.userspace_pm_local_addr_list, list) {
if (mptcp_addresses_equal(&entry->addr, &addr->addr, false)) {
/* TODO: a refcount is needed because the entry can
* be used multiple times (e.g. fullmesh mode).
*/
list_del_rcu(&entry->list);
kfree(entry);
msk->pm.local_addr_used--;
return 0;
}
}
return -EINVAL;
}
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");
err = -EINVAL;
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)) {
msk->pm.add_addr_signaled++;
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(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;
}
int mptcp_nl_cmd_sf_create(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
struct mptcp_pm_addr_entry local = { 0 };
struct mptcp_addr_info addr_r;
struct mptcp_addr_info addr_l;
struct mptcp_sock *msk;
int err = -EINVAL;
struct sock *sk;
u32 token_val;
if (!laddr || !raddr || !token) {
GENL_SET_ERR_MSG(info, "missing required inputs");
return err;
}
token_val = nla_get_u32(token);
msk = mptcp_token_get_sock(genl_info_net(info), 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 create_err;
}
err = mptcp_pm_parse_addr(laddr, info, &addr_l);
if (err < 0) {
NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr");
goto create_err;
}
if (addr_l.id == 0) {
NL_SET_ERR_MSG_ATTR(info->extack, laddr, "missing local addr id");
err = -EINVAL;
goto create_err;
}
err = mptcp_pm_parse_addr(raddr, info, &addr_r);
if (err < 0) {
NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr");
goto create_err;
}
sk = &msk->sk.icsk_inet.sk;
if (!mptcp_pm_addr_families_match(sk, &addr_l, &addr_r)) {
GENL_SET_ERR_MSG(info, "families mismatch");
err = -EINVAL;
goto create_err;
}
local.addr = addr_l;
err = mptcp_userspace_pm_append_new_local_addr(msk, &local);
if (err < 0) {
GENL_SET_ERR_MSG(info, "did not match address and id");
goto create_err;
}
lock_sock(sk);
err = __mptcp_subflow_connect(sk, &addr_l, &addr_r);
release_sock(sk);
spin_lock_bh(&msk->pm.lock);
if (err)
mptcp_userspace_pm_delete_local_addr(msk, &local);
else
msk->pm.subflows++;
spin_unlock_bh(&msk->pm.lock);
create_err:
sock_put((struct sock *)msk);
return err;
}
static struct sock *mptcp_nl_find_ssk(struct mptcp_sock *msk,
const struct mptcp_addr_info *local,
const struct mptcp_addr_info *remote)
{
struct mptcp_subflow_context *subflow;
if (local->family != remote->family)
return NULL;
mptcp_for_each_subflow(msk, subflow) {
const struct inet_sock *issk;
struct sock *ssk;
ssk = mptcp_subflow_tcp_sock(subflow);
if (local->family != ssk->sk_family)
continue;
issk = inet_sk(ssk);
switch (ssk->sk_family) {
case AF_INET:
if (issk->inet_saddr != local->addr.s_addr ||
issk->inet_daddr != remote->addr.s_addr)
continue;
break;
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
case AF_INET6: {
const struct ipv6_pinfo *pinfo = inet6_sk(ssk);
if (!ipv6_addr_equal(&local->addr6, &pinfo->saddr) ||
!ipv6_addr_equal(&remote->addr6, &ssk->sk_v6_daddr))
continue;
break;
}
#endif
default:
continue;
}
if (issk->inet_sport == local->port &&
issk->inet_dport == remote->port)
return ssk;
}
return NULL;
}
int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *raddr = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
struct nlattr *laddr = info->attrs[MPTCP_PM_ATTR_ADDR];
struct mptcp_addr_info addr_l;
struct mptcp_addr_info addr_r;
struct mptcp_sock *msk;
struct sock *sk, *ssk;
int err = -EINVAL;
u32 token_val;
if (!laddr || !raddr || !token) {
GENL_SET_ERR_MSG(info, "missing required inputs");
return err;
}
token_val = nla_get_u32(token);
msk = mptcp_token_get_sock(genl_info_net(info), 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 destroy_err;
}
err = mptcp_pm_parse_addr(laddr, info, &addr_l);
if (err < 0) {
NL_SET_ERR_MSG_ATTR(info->extack, laddr, "error parsing local addr");
goto destroy_err;
}
err = mptcp_pm_parse_addr(raddr, info, &addr_r);
if (err < 0) {
NL_SET_ERR_MSG_ATTR(info->extack, raddr, "error parsing remote addr");
goto destroy_err;
}
if (addr_l.family != addr_r.family) {
GENL_SET_ERR_MSG(info, "address families do not match");
err = -EINVAL;
goto destroy_err;
}
if (!addr_l.port || !addr_r.port) {
GENL_SET_ERR_MSG(info, "missing local or remote port");
err = -EINVAL;
goto destroy_err;
}
sk = &msk->sk.icsk_inet.sk;
lock_sock(sk);
ssk = mptcp_nl_find_ssk(msk, &addr_l, &addr_r);
if (ssk) {
struct mptcp_subflow_context *subflow = mptcp_subflow_ctx(ssk);
struct mptcp_pm_addr_entry entry = { .addr = addr_l };
spin_lock_bh(&msk->pm.lock);
mptcp_userspace_pm_delete_local_addr(msk, &entry);
spin_unlock_bh(&msk->pm.lock);
mptcp_subflow_shutdown(sk, ssk, RCV_SHUTDOWN | SEND_SHUTDOWN);
mptcp_close_ssk(sk, ssk, subflow);
MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_RMSUBFLOW);
err = 0;
} else {
err = -ESRCH;
}
release_sock(sk);
destroy_err:
sock_put((struct sock *)msk);
return err;
}
int mptcp_userspace_pm_set_flags(struct net *net, struct nlattr *token,
struct mptcp_pm_addr_entry *loc,
struct mptcp_pm_addr_entry *rem, u8 bkup)
{
struct mptcp_sock *msk;
int ret = -EINVAL;
u32 token_val;
token_val = nla_get_u32(token);
msk = mptcp_token_get_sock(net, token_val);
if (!msk)
return ret;
if (!mptcp_pm_is_userspace(msk))
goto set_flags_err;
if (loc->addr.family == AF_UNSPEC ||
rem->addr.family == AF_UNSPEC)
goto set_flags_err;
lock_sock((struct sock *)msk);
ret = mptcp_pm_nl_mp_prio_send_ack(msk, &loc->addr, &rem->addr, bkup);
release_sock((struct sock *)msk);
set_flags_err:
sock_put((struct sock *)msk);
return ret;
}