Before this modification, this function was quite long with many levels of indentations.
Each case can be split in a dedicated function: fullmesh, C flag, any. No functional changes intended. Reviewed-by: Geliang Tang <[email protected]> Signed-off-by: Matthieu Baerts (NGI0) <[email protected]> --- net/mptcp/pm_kernel.c | 199 +++++++++++++++++++++++++++++--------------------- 1 file changed, 116 insertions(+), 83 deletions(-) diff --git a/net/mptcp/pm_kernel.c b/net/mptcp/pm_kernel.c index 8c46493a0835b0e2d5e70950662ae6e845393777..c8f2af2277c2c28bc7ad393bc4ef8507ddd3a875 100644 --- a/net/mptcp/pm_kernel.c +++ b/net/mptcp/pm_kernel.c @@ -377,116 +377,149 @@ static void mptcp_pm_nl_subflow_established(struct mptcp_sock *msk) mptcp_pm_create_subflow_or_signal_addr(msk); } -/* Fill all the local addresses into the array addrs[], - * and return the array size. - */ -static unsigned int fill_local_addresses_vec(struct mptcp_sock *msk, - struct mptcp_addr_info *remote, - struct mptcp_pm_local *locals) +static unsigned int +fill_local_addresses_vec_fullmesh(struct mptcp_sock *msk, + struct mptcp_addr_info *remote, + struct mptcp_pm_local *locals, + bool c_flag_case) { + struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); + unsigned int subflows_max = mptcp_pm_get_subflows_max(msk); struct sock *sk = (struct sock *)msk; struct mptcp_pm_addr_entry *entry; struct mptcp_addr_info mpc_addr; - struct pm_nl_pernet *pernet; - unsigned int subflows_max; - bool c_flag_case; + struct mptcp_pm_local *local; int i = 0; - pernet = pm_nl_get_pernet_from_msk(msk); - subflows_max = mptcp_pm_get_subflows_max(msk); - c_flag_case = remote->id && mptcp_pm_add_addr_c_flag_case(msk); - mptcp_local_address((struct sock_common *)msk, &mpc_addr); rcu_read_lock(); list_for_each_entry_rcu(entry, &pernet->local_addr_list, list) { + bool is_id0; + if (!(entry->flags & MPTCP_PM_ADDR_FLAG_FULLMESH)) continue; if (!mptcp_pm_addr_families_match(sk, &entry->addr, remote)) continue; - if (msk->pm.subflows < subflows_max) { - bool is_id0; + local = &locals[i]; + local->addr = entry->addr; + local->flags = entry->flags; + local->ifindex = entry->ifindex; - locals[i].addr = entry->addr; - locals[i].flags = entry->flags; - locals[i].ifindex = entry->ifindex; + is_id0 = mptcp_addresses_equal(&local->addr, &mpc_addr, + local->addr.port); - is_id0 = mptcp_addresses_equal(&locals[i].addr, - &mpc_addr, - locals[i].addr.port); + if (c_flag_case && + (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)) { + __clear_bit(local->addr.id, msk->pm.id_avail_bitmap); - if (c_flag_case && - (entry->flags & MPTCP_PM_ADDR_FLAG_SUBFLOW)) { - __clear_bit(locals[i].addr.id, - msk->pm.id_avail_bitmap); - - if (!is_id0) - msk->pm.local_addr_used++; - } - - /* Special case for ID0: set the correct ID */ - if (is_id0) - locals[i].addr.id = 0; - - msk->pm.subflows++; - i++; + if (!is_id0) + msk->pm.local_addr_used++; } + + /* Special case for ID0: set the correct ID */ + if (is_id0) + local->addr.id = 0; + + msk->pm.subflows++; + i++; + + if (msk->pm.subflows >= subflows_max) + break; } rcu_read_unlock(); + return i; +} + +static unsigned int +fill_local_addresses_vec_c_flag(struct mptcp_sock *msk, + struct mptcp_addr_info *remote, + struct mptcp_pm_local *locals) +{ + unsigned int local_addr_max = mptcp_pm_get_local_addr_max(msk); + struct pm_nl_pernet *pernet = pm_nl_get_pernet_from_msk(msk); + unsigned int subflows_max = mptcp_pm_get_subflows_max(msk); + struct sock *sk = (struct sock *)msk; + struct mptcp_addr_info mpc_addr; + struct mptcp_pm_local *local; + int i = 0; + + mptcp_local_address((struct sock_common *)msk, &mpc_addr); + + while (msk->pm.local_addr_used < local_addr_max) { + local = &locals[i]; + + if (!select_local_address(pernet, msk, local)) + break; + + __clear_bit(local->addr.id, msk->pm.id_avail_bitmap); + + if (!mptcp_pm_addr_families_match(sk, &local->addr, remote)) + continue; + + if (mptcp_addresses_equal(&local->addr, &mpc_addr, + local->addr.port)) + continue; + + msk->pm.local_addr_used++; + msk->pm.subflows++; + i++; + + if (msk->pm.subflows >= subflows_max) + break; + } + + return i; +} + +static unsigned int +fill_local_address_any(struct mptcp_sock *msk, struct mptcp_addr_info *remote, + struct mptcp_pm_local *local) +{ + struct sock *sk = (struct sock *)msk; + + memset(local, 0, sizeof(*local)); + local->addr.family = +#if IS_ENABLED(CONFIG_MPTCP_IPV6) + remote->family == AF_INET6 && + ipv6_addr_v4mapped(&remote->addr6) ? AF_INET : +#endif + remote->family; + + if (!mptcp_pm_addr_families_match(sk, &local->addr, remote)) + return 0; + + msk->pm.subflows++; + + return 1; +} + +/* Fill all the local addresses into the array addrs[], + * and return the array size. + */ +static unsigned int +fill_local_addresses_vec(struct mptcp_sock *msk, struct mptcp_addr_info *remote, + struct mptcp_pm_local *locals) +{ + bool c_flag_case = remote->id && mptcp_pm_add_addr_c_flag_case(msk); + int i; + + /* If there is at least one MPTCP endpoint with a fullmesh flag */ + i = fill_local_addresses_vec_fullmesh(msk, remote, locals, c_flag_case); + if (i) + return i; + /* Special case: peer sets the C flag, accept one ADD_ADDR if default * limits are used -- accepting no ADD_ADDR -- and use subflow endpoints */ - if (!i && c_flag_case) { - unsigned int local_addr_max = mptcp_pm_get_local_addr_max(msk); + if (c_flag_case) + return fill_local_addresses_vec_c_flag(msk, remote, locals); - while (msk->pm.local_addr_used < local_addr_max && - msk->pm.subflows < subflows_max) { - struct mptcp_pm_local *local = &locals[i]; - - if (!select_local_address(pernet, msk, local)) - break; - - __clear_bit(local->addr.id, msk->pm.id_avail_bitmap); - - if (!mptcp_pm_addr_families_match(sk, &local->addr, - remote)) - continue; - - if (mptcp_addresses_equal(&local->addr, &mpc_addr, - local->addr.port)) - continue; - - msk->pm.local_addr_used++; - msk->pm.subflows++; - i++; - } - - return i; - } - - /* If the array is empty, fill in the single - * 'IPADDRANY' local address - */ - if (!i) { - memset(&locals[i], 0, sizeof(locals[i])); - locals[i].addr.family = -#if IS_ENABLED(CONFIG_MPTCP_IPV6) - remote->family == AF_INET6 && - ipv6_addr_v4mapped(&remote->addr6) ? AF_INET : -#endif - remote->family; - - if (!mptcp_pm_addr_families_match(sk, &locals[i].addr, remote)) - return 0; - - msk->pm.subflows++; - i++; - } - - return i; + /* No special case: fill in the single 'IPADDRANY' local address */ + return fill_local_address_any(msk, remote, &locals[0]); } static void mptcp_pm_nl_add_addr_received(struct mptcp_sock *msk) -- 2.51.0
