mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 20:15:13 +07:00
5609e2bbef
Fix the following sparse warning:
net/mptcp/protocol.c:646:13: warning: symbol 'mptcp_sk_clone_lock' was not declared. Should it be static?
Fixes: b0519de8b3
("mptcp: fix use-after-free for ipv6")
Signed-off-by: Chen Wandun <chenwandun@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
1253 lines
29 KiB
C
1253 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Multipath TCP
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*
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* Copyright (c) 2017 - 2019, Intel Corporation.
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*/
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#define pr_fmt(fmt) "MPTCP: " fmt
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/netdevice.h>
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#include <linux/sched/signal.h>
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#include <linux/atomic.h>
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#include <net/sock.h>
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#include <net/inet_common.h>
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#include <net/inet_hashtables.h>
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#include <net/protocol.h>
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#include <net/tcp.h>
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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#include <net/transp_v6.h>
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#endif
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#include <net/mptcp.h>
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#include "protocol.h"
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#define MPTCP_SAME_STATE TCP_MAX_STATES
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#if IS_ENABLED(CONFIG_MPTCP_IPV6)
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struct mptcp6_sock {
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struct mptcp_sock msk;
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struct ipv6_pinfo np;
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};
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#endif
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/* If msk has an initial subflow socket, and the MP_CAPABLE handshake has not
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* completed yet or has failed, return the subflow socket.
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* Otherwise return NULL.
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*/
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static struct socket *__mptcp_nmpc_socket(const struct mptcp_sock *msk)
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{
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if (!msk->subflow || READ_ONCE(msk->can_ack))
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return NULL;
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return msk->subflow;
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}
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static bool __mptcp_needs_tcp_fallback(const struct mptcp_sock *msk)
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{
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return msk->first && !sk_is_mptcp(msk->first);
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}
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static struct socket *__mptcp_tcp_fallback(struct mptcp_sock *msk)
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{
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sock_owned_by_me((const struct sock *)msk);
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if (likely(!__mptcp_needs_tcp_fallback(msk)))
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return NULL;
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if (msk->subflow) {
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release_sock((struct sock *)msk);
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return msk->subflow;
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}
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return NULL;
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}
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static bool __mptcp_can_create_subflow(const struct mptcp_sock *msk)
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{
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return !msk->first;
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}
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static struct socket *__mptcp_socket_create(struct mptcp_sock *msk, int state)
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{
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struct mptcp_subflow_context *subflow;
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struct sock *sk = (struct sock *)msk;
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struct socket *ssock;
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int err;
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ssock = __mptcp_nmpc_socket(msk);
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if (ssock)
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goto set_state;
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if (!__mptcp_can_create_subflow(msk))
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return ERR_PTR(-EINVAL);
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err = mptcp_subflow_create_socket(sk, &ssock);
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if (err)
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return ERR_PTR(err);
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msk->first = ssock->sk;
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msk->subflow = ssock;
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subflow = mptcp_subflow_ctx(ssock->sk);
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list_add(&subflow->node, &msk->conn_list);
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subflow->request_mptcp = 1;
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set_state:
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if (state != MPTCP_SAME_STATE)
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inet_sk_state_store(sk, state);
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return ssock;
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}
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static struct sock *mptcp_subflow_get(const struct mptcp_sock *msk)
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{
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struct mptcp_subflow_context *subflow;
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sock_owned_by_me((const struct sock *)msk);
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mptcp_for_each_subflow(msk, subflow) {
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return mptcp_subflow_tcp_sock(subflow);
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}
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return NULL;
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}
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static bool mptcp_ext_cache_refill(struct mptcp_sock *msk)
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{
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if (!msk->cached_ext)
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msk->cached_ext = __skb_ext_alloc();
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return !!msk->cached_ext;
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}
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static struct sock *mptcp_subflow_recv_lookup(const struct mptcp_sock *msk)
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{
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struct mptcp_subflow_context *subflow;
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struct sock *sk = (struct sock *)msk;
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sock_owned_by_me(sk);
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mptcp_for_each_subflow(msk, subflow) {
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if (subflow->data_avail)
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return mptcp_subflow_tcp_sock(subflow);
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}
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return NULL;
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}
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static inline bool mptcp_skb_can_collapse_to(const struct mptcp_sock *msk,
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const struct sk_buff *skb,
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const struct mptcp_ext *mpext)
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{
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if (!tcp_skb_can_collapse_to(skb))
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return false;
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/* can collapse only if MPTCP level sequence is in order */
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return mpext && mpext->data_seq + mpext->data_len == msk->write_seq;
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}
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static int mptcp_sendmsg_frag(struct sock *sk, struct sock *ssk,
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struct msghdr *msg, long *timeo, int *pmss_now,
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int *ps_goal)
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{
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int mss_now, avail_size, size_goal, ret;
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struct mptcp_sock *msk = mptcp_sk(sk);
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struct mptcp_ext *mpext = NULL;
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struct sk_buff *skb, *tail;
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bool can_collapse = false;
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struct page_frag *pfrag;
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size_t psize;
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/* use the mptcp page cache so that we can easily move the data
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* from one substream to another, but do per subflow memory accounting
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*/
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pfrag = sk_page_frag(sk);
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while (!sk_page_frag_refill(ssk, pfrag) ||
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!mptcp_ext_cache_refill(msk)) {
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ret = sk_stream_wait_memory(ssk, timeo);
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if (ret)
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return ret;
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if (unlikely(__mptcp_needs_tcp_fallback(msk)))
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return 0;
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}
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/* compute copy limit */
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mss_now = tcp_send_mss(ssk, &size_goal, msg->msg_flags);
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*pmss_now = mss_now;
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*ps_goal = size_goal;
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avail_size = size_goal;
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skb = tcp_write_queue_tail(ssk);
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if (skb) {
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mpext = skb_ext_find(skb, SKB_EXT_MPTCP);
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/* Limit the write to the size available in the
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* current skb, if any, so that we create at most a new skb.
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* Explicitly tells TCP internals to avoid collapsing on later
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* queue management operation, to avoid breaking the ext <->
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* SSN association set here
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*/
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can_collapse = (size_goal - skb->len > 0) &&
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mptcp_skb_can_collapse_to(msk, skb, mpext);
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if (!can_collapse)
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TCP_SKB_CB(skb)->eor = 1;
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else
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avail_size = size_goal - skb->len;
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}
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psize = min_t(size_t, pfrag->size - pfrag->offset, avail_size);
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/* Copy to page */
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pr_debug("left=%zu", msg_data_left(msg));
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psize = copy_page_from_iter(pfrag->page, pfrag->offset,
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min_t(size_t, msg_data_left(msg), psize),
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&msg->msg_iter);
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pr_debug("left=%zu", msg_data_left(msg));
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if (!psize)
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return -EINVAL;
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/* tell the TCP stack to delay the push so that we can safely
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* access the skb after the sendpages call
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*/
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ret = do_tcp_sendpages(ssk, pfrag->page, pfrag->offset, psize,
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msg->msg_flags | MSG_SENDPAGE_NOTLAST);
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if (ret <= 0)
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return ret;
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if (unlikely(ret < psize))
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iov_iter_revert(&msg->msg_iter, psize - ret);
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/* if the tail skb extension is still the cached one, collapsing
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* really happened. Note: we can't check for 'same skb' as the sk_buff
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* hdr on tail can be transmitted, freed and re-allocated by the
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* do_tcp_sendpages() call
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*/
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tail = tcp_write_queue_tail(ssk);
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if (mpext && tail && mpext == skb_ext_find(tail, SKB_EXT_MPTCP)) {
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WARN_ON_ONCE(!can_collapse);
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mpext->data_len += ret;
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goto out;
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}
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skb = tcp_write_queue_tail(ssk);
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mpext = __skb_ext_set(skb, SKB_EXT_MPTCP, msk->cached_ext);
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msk->cached_ext = NULL;
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memset(mpext, 0, sizeof(*mpext));
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mpext->data_seq = msk->write_seq;
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mpext->subflow_seq = mptcp_subflow_ctx(ssk)->rel_write_seq;
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mpext->data_len = ret;
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mpext->use_map = 1;
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mpext->dsn64 = 1;
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pr_debug("data_seq=%llu subflow_seq=%u data_len=%u dsn64=%d",
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mpext->data_seq, mpext->subflow_seq, mpext->data_len,
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mpext->dsn64);
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out:
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pfrag->offset += ret;
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msk->write_seq += ret;
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mptcp_subflow_ctx(ssk)->rel_write_seq += ret;
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return ret;
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}
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static void ssk_check_wmem(struct mptcp_sock *msk, struct sock *ssk)
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{
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struct socket *sock;
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if (likely(sk_stream_is_writeable(ssk)))
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return;
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sock = READ_ONCE(ssk->sk_socket);
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if (sock) {
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clear_bit(MPTCP_SEND_SPACE, &msk->flags);
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smp_mb__after_atomic();
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/* set NOSPACE only after clearing SEND_SPACE flag */
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set_bit(SOCK_NOSPACE, &sock->flags);
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}
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}
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static int mptcp_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
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{
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int mss_now = 0, size_goal = 0, ret = 0;
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struct mptcp_sock *msk = mptcp_sk(sk);
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struct socket *ssock;
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size_t copied = 0;
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struct sock *ssk;
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long timeo;
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if (msg->msg_flags & ~(MSG_MORE | MSG_DONTWAIT | MSG_NOSIGNAL))
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return -EOPNOTSUPP;
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lock_sock(sk);
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ssock = __mptcp_tcp_fallback(msk);
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if (unlikely(ssock)) {
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fallback:
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pr_debug("fallback passthrough");
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ret = sock_sendmsg(ssock, msg);
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return ret >= 0 ? ret + copied : (copied ? copied : ret);
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}
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timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
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ssk = mptcp_subflow_get(msk);
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if (!ssk) {
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release_sock(sk);
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return -ENOTCONN;
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}
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pr_debug("conn_list->subflow=%p", ssk);
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lock_sock(ssk);
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while (msg_data_left(msg)) {
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ret = mptcp_sendmsg_frag(sk, ssk, msg, &timeo, &mss_now,
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&size_goal);
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if (ret < 0)
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break;
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if (ret == 0 && unlikely(__mptcp_needs_tcp_fallback(msk))) {
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release_sock(ssk);
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ssock = __mptcp_tcp_fallback(msk);
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goto fallback;
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}
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copied += ret;
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}
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if (copied) {
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ret = copied;
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tcp_push(ssk, msg->msg_flags, mss_now, tcp_sk(ssk)->nonagle,
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size_goal);
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}
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ssk_check_wmem(msk, ssk);
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release_sock(ssk);
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release_sock(sk);
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return ret;
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}
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int mptcp_read_actor(read_descriptor_t *desc, struct sk_buff *skb,
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unsigned int offset, size_t len)
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{
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struct mptcp_read_arg *arg = desc->arg.data;
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size_t copy_len;
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copy_len = min(desc->count, len);
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if (likely(arg->msg)) {
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int err;
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err = skb_copy_datagram_msg(skb, offset, arg->msg, copy_len);
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if (err) {
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pr_debug("error path");
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desc->error = err;
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return err;
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}
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} else {
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pr_debug("Flushing skb payload");
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}
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desc->count -= copy_len;
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pr_debug("consumed %zu bytes, %zu left", copy_len, desc->count);
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return copy_len;
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}
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static void mptcp_wait_data(struct sock *sk, long *timeo)
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{
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DEFINE_WAIT_FUNC(wait, woken_wake_function);
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struct mptcp_sock *msk = mptcp_sk(sk);
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add_wait_queue(sk_sleep(sk), &wait);
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sk_set_bit(SOCKWQ_ASYNC_WAITDATA, sk);
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sk_wait_event(sk, timeo,
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test_and_clear_bit(MPTCP_DATA_READY, &msk->flags), &wait);
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sk_clear_bit(SOCKWQ_ASYNC_WAITDATA, sk);
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remove_wait_queue(sk_sleep(sk), &wait);
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}
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static int mptcp_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
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int nonblock, int flags, int *addr_len)
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{
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struct mptcp_sock *msk = mptcp_sk(sk);
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struct mptcp_subflow_context *subflow;
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bool more_data_avail = false;
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struct mptcp_read_arg arg;
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read_descriptor_t desc;
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bool wait_data = false;
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struct socket *ssock;
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struct tcp_sock *tp;
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bool done = false;
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struct sock *ssk;
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int copied = 0;
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int target;
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long timeo;
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if (msg->msg_flags & ~(MSG_WAITALL | MSG_DONTWAIT))
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return -EOPNOTSUPP;
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lock_sock(sk);
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ssock = __mptcp_tcp_fallback(msk);
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if (unlikely(ssock)) {
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fallback:
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pr_debug("fallback-read subflow=%p",
|
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mptcp_subflow_ctx(ssock->sk));
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copied = sock_recvmsg(ssock, msg, flags);
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return copied;
|
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}
|
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|
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arg.msg = msg;
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desc.arg.data = &arg;
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desc.error = 0;
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|
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timeo = sock_rcvtimeo(sk, nonblock);
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|
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len = min_t(size_t, len, INT_MAX);
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target = sock_rcvlowat(sk, flags & MSG_WAITALL, len);
|
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|
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while (!done) {
|
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u32 map_remaining;
|
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int bytes_read;
|
|
|
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ssk = mptcp_subflow_recv_lookup(msk);
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pr_debug("msk=%p ssk=%p", msk, ssk);
|
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if (!ssk)
|
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goto wait_for_data;
|
|
|
|
subflow = mptcp_subflow_ctx(ssk);
|
|
tp = tcp_sk(ssk);
|
|
|
|
lock_sock(ssk);
|
|
do {
|
|
/* try to read as much data as available */
|
|
map_remaining = subflow->map_data_len -
|
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mptcp_subflow_get_map_offset(subflow);
|
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desc.count = min_t(size_t, len - copied, map_remaining);
|
|
pr_debug("reading %zu bytes, copied %d", desc.count,
|
|
copied);
|
|
bytes_read = tcp_read_sock(ssk, &desc,
|
|
mptcp_read_actor);
|
|
if (bytes_read < 0) {
|
|
if (!copied)
|
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copied = bytes_read;
|
|
done = true;
|
|
goto next;
|
|
}
|
|
|
|
pr_debug("msk ack_seq=%llx -> %llx", msk->ack_seq,
|
|
msk->ack_seq + bytes_read);
|
|
msk->ack_seq += bytes_read;
|
|
copied += bytes_read;
|
|
if (copied >= len) {
|
|
done = true;
|
|
goto next;
|
|
}
|
|
if (tp->urg_data && tp->urg_seq == tp->copied_seq) {
|
|
pr_err("Urgent data present, cannot proceed");
|
|
done = true;
|
|
goto next;
|
|
}
|
|
next:
|
|
more_data_avail = mptcp_subflow_data_available(ssk);
|
|
} while (more_data_avail && !done);
|
|
release_sock(ssk);
|
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continue;
|
|
|
|
wait_for_data:
|
|
more_data_avail = false;
|
|
|
|
/* only the master socket status is relevant here. The exit
|
|
* conditions mirror closely tcp_recvmsg()
|
|
*/
|
|
if (copied >= target)
|
|
break;
|
|
|
|
if (copied) {
|
|
if (sk->sk_err ||
|
|
sk->sk_state == TCP_CLOSE ||
|
|
(sk->sk_shutdown & RCV_SHUTDOWN) ||
|
|
!timeo ||
|
|
signal_pending(current))
|
|
break;
|
|
} else {
|
|
if (sk->sk_err) {
|
|
copied = sock_error(sk);
|
|
break;
|
|
}
|
|
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
break;
|
|
|
|
if (sk->sk_state == TCP_CLOSE) {
|
|
copied = -ENOTCONN;
|
|
break;
|
|
}
|
|
|
|
if (!timeo) {
|
|
copied = -EAGAIN;
|
|
break;
|
|
}
|
|
|
|
if (signal_pending(current)) {
|
|
copied = sock_intr_errno(timeo);
|
|
break;
|
|
}
|
|
}
|
|
|
|
pr_debug("block timeout %ld", timeo);
|
|
wait_data = true;
|
|
mptcp_wait_data(sk, &timeo);
|
|
if (unlikely(__mptcp_tcp_fallback(msk)))
|
|
goto fallback;
|
|
}
|
|
|
|
if (more_data_avail) {
|
|
if (!test_bit(MPTCP_DATA_READY, &msk->flags))
|
|
set_bit(MPTCP_DATA_READY, &msk->flags);
|
|
} else if (!wait_data) {
|
|
clear_bit(MPTCP_DATA_READY, &msk->flags);
|
|
|
|
/* .. race-breaker: ssk might get new data after last
|
|
* data_available() returns false.
|
|
*/
|
|
ssk = mptcp_subflow_recv_lookup(msk);
|
|
if (unlikely(ssk))
|
|
set_bit(MPTCP_DATA_READY, &msk->flags);
|
|
}
|
|
|
|
release_sock(sk);
|
|
return copied;
|
|
}
|
|
|
|
/* subflow sockets can be either outgoing (connect) or incoming
|
|
* (accept).
|
|
*
|
|
* Outgoing subflows use in-kernel sockets.
|
|
* Incoming subflows do not have their own 'struct socket' allocated,
|
|
* so we need to use tcp_close() after detaching them from the mptcp
|
|
* parent socket.
|
|
*/
|
|
static void __mptcp_close_ssk(struct sock *sk, struct sock *ssk,
|
|
struct mptcp_subflow_context *subflow,
|
|
long timeout)
|
|
{
|
|
struct socket *sock = READ_ONCE(ssk->sk_socket);
|
|
|
|
list_del(&subflow->node);
|
|
|
|
if (sock && sock != sk->sk_socket) {
|
|
/* outgoing subflow */
|
|
sock_release(sock);
|
|
} else {
|
|
/* incoming subflow */
|
|
tcp_close(ssk, timeout);
|
|
}
|
|
}
|
|
|
|
static int __mptcp_init_sock(struct sock *sk)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
|
|
INIT_LIST_HEAD(&msk->conn_list);
|
|
__set_bit(MPTCP_SEND_SPACE, &msk->flags);
|
|
|
|
msk->first = NULL;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mptcp_init_sock(struct sock *sk)
|
|
{
|
|
if (!mptcp_is_enabled(sock_net(sk)))
|
|
return -ENOPROTOOPT;
|
|
|
|
return __mptcp_init_sock(sk);
|
|
}
|
|
|
|
static void mptcp_subflow_shutdown(struct sock *ssk, int how)
|
|
{
|
|
lock_sock(ssk);
|
|
|
|
switch (ssk->sk_state) {
|
|
case TCP_LISTEN:
|
|
if (!(how & RCV_SHUTDOWN))
|
|
break;
|
|
/* fall through */
|
|
case TCP_SYN_SENT:
|
|
tcp_disconnect(ssk, O_NONBLOCK);
|
|
break;
|
|
default:
|
|
ssk->sk_shutdown |= how;
|
|
tcp_shutdown(ssk, how);
|
|
break;
|
|
}
|
|
|
|
/* Wake up anyone sleeping in poll. */
|
|
ssk->sk_state_change(ssk);
|
|
release_sock(ssk);
|
|
}
|
|
|
|
/* Called with msk lock held, releases such lock before returning */
|
|
static void mptcp_close(struct sock *sk, long timeout)
|
|
{
|
|
struct mptcp_subflow_context *subflow, *tmp;
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
LIST_HEAD(conn_list);
|
|
|
|
lock_sock(sk);
|
|
|
|
mptcp_token_destroy(msk->token);
|
|
inet_sk_state_store(sk, TCP_CLOSE);
|
|
|
|
list_splice_init(&msk->conn_list, &conn_list);
|
|
|
|
release_sock(sk);
|
|
|
|
list_for_each_entry_safe(subflow, tmp, &conn_list, node) {
|
|
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
|
|
|
|
__mptcp_close_ssk(sk, ssk, subflow, timeout);
|
|
}
|
|
|
|
sk_common_release(sk);
|
|
}
|
|
|
|
static void mptcp_copy_inaddrs(struct sock *msk, const struct sock *ssk)
|
|
{
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
const struct ipv6_pinfo *ssk6 = inet6_sk(ssk);
|
|
struct ipv6_pinfo *msk6 = inet6_sk(msk);
|
|
|
|
msk->sk_v6_daddr = ssk->sk_v6_daddr;
|
|
msk->sk_v6_rcv_saddr = ssk->sk_v6_rcv_saddr;
|
|
|
|
if (msk6 && ssk6) {
|
|
msk6->saddr = ssk6->saddr;
|
|
msk6->flow_label = ssk6->flow_label;
|
|
}
|
|
#endif
|
|
|
|
inet_sk(msk)->inet_num = inet_sk(ssk)->inet_num;
|
|
inet_sk(msk)->inet_dport = inet_sk(ssk)->inet_dport;
|
|
inet_sk(msk)->inet_sport = inet_sk(ssk)->inet_sport;
|
|
inet_sk(msk)->inet_daddr = inet_sk(ssk)->inet_daddr;
|
|
inet_sk(msk)->inet_saddr = inet_sk(ssk)->inet_saddr;
|
|
inet_sk(msk)->inet_rcv_saddr = inet_sk(ssk)->inet_rcv_saddr;
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
static struct ipv6_pinfo *mptcp_inet6_sk(const struct sock *sk)
|
|
{
|
|
unsigned int offset = sizeof(struct mptcp6_sock) - sizeof(struct ipv6_pinfo);
|
|
|
|
return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
|
|
}
|
|
#endif
|
|
|
|
static struct sock *mptcp_sk_clone_lock(const struct sock *sk)
|
|
{
|
|
struct sock *nsk = sk_clone_lock(sk, GFP_ATOMIC);
|
|
|
|
if (!nsk)
|
|
return NULL;
|
|
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
if (nsk->sk_family == AF_INET6)
|
|
inet_sk(nsk)->pinet6 = mptcp_inet6_sk(nsk);
|
|
#endif
|
|
|
|
return nsk;
|
|
}
|
|
|
|
static struct sock *mptcp_accept(struct sock *sk, int flags, int *err,
|
|
bool kern)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
struct socket *listener;
|
|
struct sock *newsk;
|
|
|
|
listener = __mptcp_nmpc_socket(msk);
|
|
if (WARN_ON_ONCE(!listener)) {
|
|
*err = -EINVAL;
|
|
return NULL;
|
|
}
|
|
|
|
pr_debug("msk=%p, listener=%p", msk, mptcp_subflow_ctx(listener->sk));
|
|
newsk = inet_csk_accept(listener->sk, flags, err, kern);
|
|
if (!newsk)
|
|
return NULL;
|
|
|
|
pr_debug("msk=%p, subflow is mptcp=%d", msk, sk_is_mptcp(newsk));
|
|
|
|
if (sk_is_mptcp(newsk)) {
|
|
struct mptcp_subflow_context *subflow;
|
|
struct sock *new_mptcp_sock;
|
|
struct sock *ssk = newsk;
|
|
u64 ack_seq;
|
|
|
|
subflow = mptcp_subflow_ctx(newsk);
|
|
lock_sock(sk);
|
|
|
|
local_bh_disable();
|
|
new_mptcp_sock = mptcp_sk_clone_lock(sk);
|
|
if (!new_mptcp_sock) {
|
|
*err = -ENOBUFS;
|
|
local_bh_enable();
|
|
release_sock(sk);
|
|
mptcp_subflow_shutdown(newsk, SHUT_RDWR + 1);
|
|
tcp_close(newsk, 0);
|
|
return NULL;
|
|
}
|
|
|
|
__mptcp_init_sock(new_mptcp_sock);
|
|
|
|
msk = mptcp_sk(new_mptcp_sock);
|
|
msk->local_key = subflow->local_key;
|
|
msk->token = subflow->token;
|
|
msk->subflow = NULL;
|
|
msk->first = newsk;
|
|
|
|
mptcp_token_update_accept(newsk, new_mptcp_sock);
|
|
|
|
msk->write_seq = subflow->idsn + 1;
|
|
if (subflow->can_ack) {
|
|
msk->can_ack = true;
|
|
msk->remote_key = subflow->remote_key;
|
|
mptcp_crypto_key_sha(msk->remote_key, NULL, &ack_seq);
|
|
ack_seq++;
|
|
msk->ack_seq = ack_seq;
|
|
}
|
|
newsk = new_mptcp_sock;
|
|
mptcp_copy_inaddrs(newsk, ssk);
|
|
list_add(&subflow->node, &msk->conn_list);
|
|
|
|
/* will be fully established at mptcp_stream_accept()
|
|
* completion.
|
|
*/
|
|
inet_sk_state_store(new_mptcp_sock, TCP_SYN_RECV);
|
|
bh_unlock_sock(new_mptcp_sock);
|
|
local_bh_enable();
|
|
release_sock(sk);
|
|
|
|
/* the subflow can already receive packet, avoid racing with
|
|
* the receive path and process the pending ones
|
|
*/
|
|
lock_sock(ssk);
|
|
subflow->rel_write_seq = 1;
|
|
subflow->tcp_sock = ssk;
|
|
subflow->conn = new_mptcp_sock;
|
|
if (unlikely(!skb_queue_empty(&ssk->sk_receive_queue)))
|
|
mptcp_subflow_data_available(ssk);
|
|
release_sock(ssk);
|
|
}
|
|
|
|
return newsk;
|
|
}
|
|
|
|
static void mptcp_destroy(struct sock *sk)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
|
|
if (msk->cached_ext)
|
|
__skb_ext_put(msk->cached_ext);
|
|
}
|
|
|
|
static int mptcp_setsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, unsigned int optlen)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
int ret = -EOPNOTSUPP;
|
|
struct socket *ssock;
|
|
struct sock *ssk;
|
|
|
|
pr_debug("msk=%p", msk);
|
|
|
|
/* @@ the meaning of setsockopt() when the socket is connected and
|
|
* there are multiple subflows is not defined.
|
|
*/
|
|
lock_sock(sk);
|
|
ssock = __mptcp_socket_create(msk, MPTCP_SAME_STATE);
|
|
if (IS_ERR(ssock)) {
|
|
release_sock(sk);
|
|
return ret;
|
|
}
|
|
|
|
ssk = ssock->sk;
|
|
sock_hold(ssk);
|
|
release_sock(sk);
|
|
|
|
ret = tcp_setsockopt(ssk, level, optname, optval, optlen);
|
|
sock_put(ssk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mptcp_getsockopt(struct sock *sk, int level, int optname,
|
|
char __user *optval, int __user *option)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
int ret = -EOPNOTSUPP;
|
|
struct socket *ssock;
|
|
struct sock *ssk;
|
|
|
|
pr_debug("msk=%p", msk);
|
|
|
|
/* @@ the meaning of getsockopt() when the socket is connected and
|
|
* there are multiple subflows is not defined.
|
|
*/
|
|
lock_sock(sk);
|
|
ssock = __mptcp_socket_create(msk, MPTCP_SAME_STATE);
|
|
if (IS_ERR(ssock)) {
|
|
release_sock(sk);
|
|
return ret;
|
|
}
|
|
|
|
ssk = ssock->sk;
|
|
sock_hold(ssk);
|
|
release_sock(sk);
|
|
|
|
ret = tcp_getsockopt(ssk, level, optname, optval, option);
|
|
sock_put(ssk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mptcp_get_port(struct sock *sk, unsigned short snum)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
struct socket *ssock;
|
|
|
|
ssock = __mptcp_nmpc_socket(msk);
|
|
pr_debug("msk=%p, subflow=%p", msk, ssock);
|
|
if (WARN_ON_ONCE(!ssock))
|
|
return -EINVAL;
|
|
|
|
return inet_csk_get_port(ssock->sk, snum);
|
|
}
|
|
|
|
void mptcp_finish_connect(struct sock *ssk)
|
|
{
|
|
struct mptcp_subflow_context *subflow;
|
|
struct mptcp_sock *msk;
|
|
struct sock *sk;
|
|
u64 ack_seq;
|
|
|
|
subflow = mptcp_subflow_ctx(ssk);
|
|
|
|
if (!subflow->mp_capable)
|
|
return;
|
|
|
|
sk = subflow->conn;
|
|
msk = mptcp_sk(sk);
|
|
|
|
pr_debug("msk=%p, token=%u", sk, subflow->token);
|
|
|
|
mptcp_crypto_key_sha(subflow->remote_key, NULL, &ack_seq);
|
|
ack_seq++;
|
|
subflow->map_seq = ack_seq;
|
|
subflow->map_subflow_seq = 1;
|
|
subflow->rel_write_seq = 1;
|
|
|
|
/* the socket is not connected yet, no msk/subflow ops can access/race
|
|
* accessing the field below
|
|
*/
|
|
WRITE_ONCE(msk->remote_key, subflow->remote_key);
|
|
WRITE_ONCE(msk->local_key, subflow->local_key);
|
|
WRITE_ONCE(msk->token, subflow->token);
|
|
WRITE_ONCE(msk->write_seq, subflow->idsn + 1);
|
|
WRITE_ONCE(msk->ack_seq, ack_seq);
|
|
WRITE_ONCE(msk->can_ack, 1);
|
|
}
|
|
|
|
static void mptcp_sock_graft(struct sock *sk, struct socket *parent)
|
|
{
|
|
write_lock_bh(&sk->sk_callback_lock);
|
|
rcu_assign_pointer(sk->sk_wq, &parent->wq);
|
|
sk_set_socket(sk, parent);
|
|
sk->sk_uid = SOCK_INODE(parent)->i_uid;
|
|
write_unlock_bh(&sk->sk_callback_lock);
|
|
}
|
|
|
|
static bool mptcp_memory_free(const struct sock *sk, int wake)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sk);
|
|
|
|
return wake ? test_bit(MPTCP_SEND_SPACE, &msk->flags) : true;
|
|
}
|
|
|
|
static struct proto mptcp_prot = {
|
|
.name = "MPTCP",
|
|
.owner = THIS_MODULE,
|
|
.init = mptcp_init_sock,
|
|
.close = mptcp_close,
|
|
.accept = mptcp_accept,
|
|
.setsockopt = mptcp_setsockopt,
|
|
.getsockopt = mptcp_getsockopt,
|
|
.shutdown = tcp_shutdown,
|
|
.destroy = mptcp_destroy,
|
|
.sendmsg = mptcp_sendmsg,
|
|
.recvmsg = mptcp_recvmsg,
|
|
.hash = inet_hash,
|
|
.unhash = inet_unhash,
|
|
.get_port = mptcp_get_port,
|
|
.stream_memory_free = mptcp_memory_free,
|
|
.obj_size = sizeof(struct mptcp_sock),
|
|
.no_autobind = true,
|
|
};
|
|
|
|
static int mptcp_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sock->sk);
|
|
struct socket *ssock;
|
|
int err;
|
|
|
|
lock_sock(sock->sk);
|
|
ssock = __mptcp_socket_create(msk, MPTCP_SAME_STATE);
|
|
if (IS_ERR(ssock)) {
|
|
err = PTR_ERR(ssock);
|
|
goto unlock;
|
|
}
|
|
|
|
err = ssock->ops->bind(ssock, uaddr, addr_len);
|
|
if (!err)
|
|
mptcp_copy_inaddrs(sock->sk, ssock->sk);
|
|
|
|
unlock:
|
|
release_sock(sock->sk);
|
|
return err;
|
|
}
|
|
|
|
static int mptcp_stream_connect(struct socket *sock, struct sockaddr *uaddr,
|
|
int addr_len, int flags)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sock->sk);
|
|
struct socket *ssock;
|
|
int err;
|
|
|
|
lock_sock(sock->sk);
|
|
ssock = __mptcp_socket_create(msk, TCP_SYN_SENT);
|
|
if (IS_ERR(ssock)) {
|
|
err = PTR_ERR(ssock);
|
|
goto unlock;
|
|
}
|
|
|
|
#ifdef CONFIG_TCP_MD5SIG
|
|
/* no MPTCP if MD5SIG is enabled on this socket or we may run out of
|
|
* TCP option space.
|
|
*/
|
|
if (rcu_access_pointer(tcp_sk(ssock->sk)->md5sig_info))
|
|
mptcp_subflow_ctx(ssock->sk)->request_mptcp = 0;
|
|
#endif
|
|
|
|
err = ssock->ops->connect(ssock, uaddr, addr_len, flags);
|
|
inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk));
|
|
mptcp_copy_inaddrs(sock->sk, ssock->sk);
|
|
|
|
unlock:
|
|
release_sock(sock->sk);
|
|
return err;
|
|
}
|
|
|
|
static int mptcp_v4_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int peer)
|
|
{
|
|
if (sock->sk->sk_prot == &tcp_prot) {
|
|
/* we are being invoked from __sys_accept4, after
|
|
* mptcp_accept() has just accepted a non-mp-capable
|
|
* flow: sk is a tcp_sk, not an mptcp one.
|
|
*
|
|
* Hand the socket over to tcp so all further socket ops
|
|
* bypass mptcp.
|
|
*/
|
|
sock->ops = &inet_stream_ops;
|
|
}
|
|
|
|
return inet_getname(sock, uaddr, peer);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
static int mptcp_v6_getname(struct socket *sock, struct sockaddr *uaddr,
|
|
int peer)
|
|
{
|
|
if (sock->sk->sk_prot == &tcpv6_prot) {
|
|
/* we are being invoked from __sys_accept4 after
|
|
* mptcp_accept() has accepted a non-mp-capable
|
|
* subflow: sk is a tcp_sk, not mptcp.
|
|
*
|
|
* Hand the socket over to tcp so all further
|
|
* socket ops bypass mptcp.
|
|
*/
|
|
sock->ops = &inet6_stream_ops;
|
|
}
|
|
|
|
return inet6_getname(sock, uaddr, peer);
|
|
}
|
|
#endif
|
|
|
|
static int mptcp_listen(struct socket *sock, int backlog)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sock->sk);
|
|
struct socket *ssock;
|
|
int err;
|
|
|
|
pr_debug("msk=%p", msk);
|
|
|
|
lock_sock(sock->sk);
|
|
ssock = __mptcp_socket_create(msk, TCP_LISTEN);
|
|
if (IS_ERR(ssock)) {
|
|
err = PTR_ERR(ssock);
|
|
goto unlock;
|
|
}
|
|
|
|
err = ssock->ops->listen(ssock, backlog);
|
|
inet_sk_state_store(sock->sk, inet_sk_state_load(ssock->sk));
|
|
if (!err)
|
|
mptcp_copy_inaddrs(sock->sk, ssock->sk);
|
|
|
|
unlock:
|
|
release_sock(sock->sk);
|
|
return err;
|
|
}
|
|
|
|
static bool is_tcp_proto(const struct proto *p)
|
|
{
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
return p == &tcp_prot || p == &tcpv6_prot;
|
|
#else
|
|
return p == &tcp_prot;
|
|
#endif
|
|
}
|
|
|
|
static int mptcp_stream_accept(struct socket *sock, struct socket *newsock,
|
|
int flags, bool kern)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sock->sk);
|
|
struct socket *ssock;
|
|
int err;
|
|
|
|
pr_debug("msk=%p", msk);
|
|
|
|
lock_sock(sock->sk);
|
|
if (sock->sk->sk_state != TCP_LISTEN)
|
|
goto unlock_fail;
|
|
|
|
ssock = __mptcp_nmpc_socket(msk);
|
|
if (!ssock)
|
|
goto unlock_fail;
|
|
|
|
sock_hold(ssock->sk);
|
|
release_sock(sock->sk);
|
|
|
|
err = ssock->ops->accept(sock, newsock, flags, kern);
|
|
if (err == 0 && !is_tcp_proto(newsock->sk->sk_prot)) {
|
|
struct mptcp_sock *msk = mptcp_sk(newsock->sk);
|
|
struct mptcp_subflow_context *subflow;
|
|
|
|
/* set ssk->sk_socket of accept()ed flows to mptcp socket.
|
|
* This is needed so NOSPACE flag can be set from tcp stack.
|
|
*/
|
|
list_for_each_entry(subflow, &msk->conn_list, node) {
|
|
struct sock *ssk = mptcp_subflow_tcp_sock(subflow);
|
|
|
|
if (!ssk->sk_socket)
|
|
mptcp_sock_graft(ssk, newsock);
|
|
}
|
|
|
|
inet_sk_state_store(newsock->sk, TCP_ESTABLISHED);
|
|
}
|
|
|
|
sock_put(ssock->sk);
|
|
return err;
|
|
|
|
unlock_fail:
|
|
release_sock(sock->sk);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static __poll_t mptcp_poll(struct file *file, struct socket *sock,
|
|
struct poll_table_struct *wait)
|
|
{
|
|
struct sock *sk = sock->sk;
|
|
struct mptcp_sock *msk;
|
|
struct socket *ssock;
|
|
__poll_t mask = 0;
|
|
|
|
msk = mptcp_sk(sk);
|
|
lock_sock(sk);
|
|
ssock = __mptcp_nmpc_socket(msk);
|
|
if (ssock) {
|
|
mask = ssock->ops->poll(file, ssock, wait);
|
|
release_sock(sk);
|
|
return mask;
|
|
}
|
|
|
|
release_sock(sk);
|
|
sock_poll_wait(file, sock, wait);
|
|
lock_sock(sk);
|
|
ssock = __mptcp_tcp_fallback(msk);
|
|
if (unlikely(ssock))
|
|
return ssock->ops->poll(file, ssock, NULL);
|
|
|
|
if (test_bit(MPTCP_DATA_READY, &msk->flags))
|
|
mask = EPOLLIN | EPOLLRDNORM;
|
|
if (sk_stream_is_writeable(sk) &&
|
|
test_bit(MPTCP_SEND_SPACE, &msk->flags))
|
|
mask |= EPOLLOUT | EPOLLWRNORM;
|
|
if (sk->sk_shutdown & RCV_SHUTDOWN)
|
|
mask |= EPOLLIN | EPOLLRDNORM | EPOLLRDHUP;
|
|
|
|
release_sock(sk);
|
|
|
|
return mask;
|
|
}
|
|
|
|
static int mptcp_shutdown(struct socket *sock, int how)
|
|
{
|
|
struct mptcp_sock *msk = mptcp_sk(sock->sk);
|
|
struct mptcp_subflow_context *subflow;
|
|
int ret = 0;
|
|
|
|
pr_debug("sk=%p, how=%d", msk, how);
|
|
|
|
lock_sock(sock->sk);
|
|
|
|
if (how == SHUT_WR || how == SHUT_RDWR)
|
|
inet_sk_state_store(sock->sk, TCP_FIN_WAIT1);
|
|
|
|
how++;
|
|
|
|
if ((how & ~SHUTDOWN_MASK) || !how) {
|
|
ret = -EINVAL;
|
|
goto out_unlock;
|
|
}
|
|
|
|
if (sock->state == SS_CONNECTING) {
|
|
if ((1 << sock->sk->sk_state) &
|
|
(TCPF_SYN_SENT | TCPF_SYN_RECV | TCPF_CLOSE))
|
|
sock->state = SS_DISCONNECTING;
|
|
else
|
|
sock->state = SS_CONNECTED;
|
|
}
|
|
|
|
mptcp_for_each_subflow(msk, subflow) {
|
|
struct sock *tcp_sk = mptcp_subflow_tcp_sock(subflow);
|
|
|
|
mptcp_subflow_shutdown(tcp_sk, how);
|
|
}
|
|
|
|
out_unlock:
|
|
release_sock(sock->sk);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct proto_ops mptcp_stream_ops = {
|
|
.family = PF_INET,
|
|
.owner = THIS_MODULE,
|
|
.release = inet_release,
|
|
.bind = mptcp_bind,
|
|
.connect = mptcp_stream_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = mptcp_stream_accept,
|
|
.getname = mptcp_v4_getname,
|
|
.poll = mptcp_poll,
|
|
.ioctl = inet_ioctl,
|
|
.gettstamp = sock_gettstamp,
|
|
.listen = mptcp_listen,
|
|
.shutdown = mptcp_shutdown,
|
|
.setsockopt = sock_common_setsockopt,
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet_sendmsg,
|
|
.recvmsg = inet_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = inet_sendpage,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
static struct inet_protosw mptcp_protosw = {
|
|
.type = SOCK_STREAM,
|
|
.protocol = IPPROTO_MPTCP,
|
|
.prot = &mptcp_prot,
|
|
.ops = &mptcp_stream_ops,
|
|
.flags = INET_PROTOSW_ICSK,
|
|
};
|
|
|
|
void mptcp_proto_init(void)
|
|
{
|
|
mptcp_prot.h.hashinfo = tcp_prot.h.hashinfo;
|
|
|
|
mptcp_subflow_init();
|
|
|
|
if (proto_register(&mptcp_prot, 1) != 0)
|
|
panic("Failed to register MPTCP proto.\n");
|
|
|
|
inet_register_protosw(&mptcp_protosw);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_MPTCP_IPV6)
|
|
static const struct proto_ops mptcp_v6_stream_ops = {
|
|
.family = PF_INET6,
|
|
.owner = THIS_MODULE,
|
|
.release = inet6_release,
|
|
.bind = mptcp_bind,
|
|
.connect = mptcp_stream_connect,
|
|
.socketpair = sock_no_socketpair,
|
|
.accept = mptcp_stream_accept,
|
|
.getname = mptcp_v6_getname,
|
|
.poll = mptcp_poll,
|
|
.ioctl = inet6_ioctl,
|
|
.gettstamp = sock_gettstamp,
|
|
.listen = mptcp_listen,
|
|
.shutdown = mptcp_shutdown,
|
|
.setsockopt = sock_common_setsockopt,
|
|
.getsockopt = sock_common_getsockopt,
|
|
.sendmsg = inet6_sendmsg,
|
|
.recvmsg = inet6_recvmsg,
|
|
.mmap = sock_no_mmap,
|
|
.sendpage = inet_sendpage,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_setsockopt = compat_sock_common_setsockopt,
|
|
.compat_getsockopt = compat_sock_common_getsockopt,
|
|
#endif
|
|
};
|
|
|
|
static struct proto mptcp_v6_prot;
|
|
|
|
static void mptcp_v6_destroy(struct sock *sk)
|
|
{
|
|
mptcp_destroy(sk);
|
|
inet6_destroy_sock(sk);
|
|
}
|
|
|
|
static struct inet_protosw mptcp_v6_protosw = {
|
|
.type = SOCK_STREAM,
|
|
.protocol = IPPROTO_MPTCP,
|
|
.prot = &mptcp_v6_prot,
|
|
.ops = &mptcp_v6_stream_ops,
|
|
.flags = INET_PROTOSW_ICSK,
|
|
};
|
|
|
|
int mptcp_proto_v6_init(void)
|
|
{
|
|
int err;
|
|
|
|
mptcp_v6_prot = mptcp_prot;
|
|
strcpy(mptcp_v6_prot.name, "MPTCPv6");
|
|
mptcp_v6_prot.slab = NULL;
|
|
mptcp_v6_prot.destroy = mptcp_v6_destroy;
|
|
mptcp_v6_prot.obj_size = sizeof(struct mptcp6_sock);
|
|
|
|
err = proto_register(&mptcp_v6_prot, 1);
|
|
if (err)
|
|
return err;
|
|
|
|
err = inet6_register_protosw(&mptcp_v6_protosw);
|
|
if (err)
|
|
proto_unregister(&mptcp_v6_prot);
|
|
|
|
return err;
|
|
}
|
|
#endif
|