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mptcp: netlink: issue MP_PRIO signals from userspace PMs

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This change updates MPTCP_PM_CMD_SET_FLAGS to allow userspace PMs
to issue MP_PRIO signals over a specific subflow selected by
the connection token, local and remote address+port.

Closes: https://github.com/multipath-tcp/mptcp_net-next/issues/286
Fixes: 702c2f646d ("mptcp: netlink: allow userspace-driven subflow establishment")
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 2022-07-05 14:32:14 -07:00 committed by David S. Miller
parent a657430260
commit 892f396c8e
3 changed files with 62 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
net/mptcp/pm_netlink.c
View File

@ -717,9 +717,10 @@ void mptcp_pm_nl_addr_send_ack(struct mptcp_sock *msk)
}
}
static int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
struct mptcp_addr_info *addr,
u8 bkup)
int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
struct mptcp_addr_info *addr,
struct mptcp_addr_info *rem,
u8 bkup)
{
struct mptcp_subflow_context *subflow;
@ -727,13 +728,19 @@ static int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
mptcp_for_each_subflow(msk, subflow) {
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
struct mptcp_addr_info local;
struct mptcp_addr_info local, remote;
bool slow;
local_address((struct sock_common *)ssk, &local);
if (!mptcp_addresses_equal(&local, addr, addr->port))
continue;
if (rem && rem->family != AF_UNSPEC) {
remote_address((struct sock_common *)ssk, &remote);
if (!mptcp_addresses_equal(&remote, rem, rem->port))
continue;
}
slow = lock_sock_fast(ssk);
if (subflow->backup != bkup)
msk->last_snd = NULL;
@ -1837,7 +1844,7 @@ static int mptcp_nl_set_flags(struct net *net,
lock_sock(sk);
if (changed & MPTCP_PM_ADDR_FLAG_BACKUP)
ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, bkup);
ret = mptcp_pm_nl_mp_prio_send_ack(msk, addr, NULL, bkup);
if (changed & MPTCP_PM_ADDR_FLAG_FULLMESH)
mptcp_pm_nl_fullmesh(msk, addr);
release_sock(sk);
@ -1853,6 +1860,9 @@ static int mptcp_nl_set_flags(struct net *net,
static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
{
struct mptcp_pm_addr_entry addr = { .addr = { .family = AF_UNSPEC }, }, *entry;
struct mptcp_pm_addr_entry remote = { .addr = { .family = AF_UNSPEC }, };
struct nlattr *attr_rem = info->attrs[MPTCP_PM_ATTR_ADDR_REMOTE];
struct nlattr *token = info->attrs[MPTCP_PM_ATTR_TOKEN];
struct nlattr *attr = info->attrs[MPTCP_PM_ATTR_ADDR];
struct pm_nl_pernet *pernet = genl_info_pm_nl(info);
u8 changed, mask = MPTCP_PM_ADDR_FLAG_BACKUP |
@ -1865,6 +1875,12 @@ static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
if (ret < 0)
return ret;
if (attr_rem) {
ret = mptcp_pm_parse_entry(attr_rem, info, false, &remote);
if (ret < 0)
return ret;
}
if (addr.flags & MPTCP_PM_ADDR_FLAG_BACKUP)
bkup = 1;
if (addr.addr.family == AF_UNSPEC) {
@ -1873,6 +1889,10 @@ static int mptcp_nl_cmd_set_flags(struct sk_buff *skb, struct genl_info *info)
return -EOPNOTSUPP;
}
if (token)
return mptcp_userspace_pm_set_flags(sock_net(skb->sk),
token, &addr, &remote, bkup);
spin_lock_bh(&pernet->lock);
entry = __lookup_addr(pernet, &addr.addr, lookup_by_id);
if (!entry) {

30
net/mptcp/pm_userspace.c
View File

@ -420,3 +420,33 @@ int mptcp_nl_cmd_sf_destroy(struct sk_buff *skb, struct genl_info *info)
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;
}

8
net/mptcp/protocol.h
View File

@ -772,6 +772,10 @@ void mptcp_pm_rm_addr_received(struct mptcp_sock *msk,
const struct mptcp_rm_list *rm_list);
void mptcp_pm_mp_prio_received(struct sock *sk, u8 bkup);
void mptcp_pm_mp_fail_received(struct sock *sk, u64 fail_seq);
int mptcp_pm_nl_mp_prio_send_ack(struct mptcp_sock *msk,
struct mptcp_addr_info *addr,
struct mptcp_addr_info *rem,
u8 bkup);
bool mptcp_pm_alloc_anno_list(struct mptcp_sock *msk,
const struct mptcp_pm_addr_entry *entry);
void mptcp_pm_free_anno_list(struct mptcp_sock *msk);
@ -788,7 +792,9 @@ int mptcp_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
int mptcp_userspace_pm_get_flags_and_ifindex_by_id(struct mptcp_sock *msk,
unsigned int id,
u8 *flags, int *ifindex);
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);
int mptcp_pm_announce_addr(struct mptcp_sock *msk,
const struct mptcp_addr_info *addr,
bool echo);