| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Atul Gupta | 11259 | 99.14% | 4 | 44.44% |
| Gustavo A. R. Silva | 84 | 0.74% | 1 | 11.11% |
| Santosh Rastapur | 10 | 0.09% | 1 | 11.11% |
| Thomas Gleixner | 2 | 0.02% | 1 | 11.11% |
| Arjun V | 1 | 0.01% | 1 | 11.11% |
| Arnd Bergmann | 1 | 0.01% | 1 | 11.11% |
| Total | 11357 | 9 |
// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2018 Chelsio Communications, Inc. * * Written by: Atul Gupta (atul.gupta@chelsio.com) */ #include <linux/module.h> #include <linux/list.h> #include <linux/workqueue.h> #include <linux/skbuff.h> #include <linux/timer.h> #include <linux/notifier.h> #include <linux/inetdevice.h> #include <linux/ip.h> #include <linux/tcp.h> #include <linux/sched/signal.h> #include <linux/kallsyms.h> #include <linux/kprobes.h> #include <linux/if_vlan.h> #include <net/inet_common.h> #include <net/tcp.h> #include <net/dst.h> #include <net/tls.h> #include "chtls.h" #include "chtls_cm.h" /* * State transitions and actions for close. Note that if we are in SYN_SENT * we remain in that state as we cannot control a connection while it's in * SYN_SENT; such connections are allowed to establish and are then aborted. */ static unsigned char new_state[16] = { /* current state: new state: action: */ /* (Invalid) */ TCP_CLOSE, /* TCP_ESTABLISHED */ TCP_FIN_WAIT1 | TCP_ACTION_FIN, /* TCP_SYN_SENT */ TCP_SYN_SENT, /* TCP_SYN_RECV */ TCP_FIN_WAIT1 | TCP_ACTION_FIN, /* TCP_FIN_WAIT1 */ TCP_FIN_WAIT1, /* TCP_FIN_WAIT2 */ TCP_FIN_WAIT2, /* TCP_TIME_WAIT */ TCP_CLOSE, /* TCP_CLOSE */ TCP_CLOSE, /* TCP_CLOSE_WAIT */ TCP_LAST_ACK | TCP_ACTION_FIN, /* TCP_LAST_ACK */ TCP_LAST_ACK, /* TCP_LISTEN */ TCP_CLOSE, /* TCP_CLOSING */ TCP_CLOSING, }; static struct chtls_sock *chtls_sock_create(struct chtls_dev *cdev) { struct chtls_sock *csk = kzalloc(sizeof(*csk), GFP_ATOMIC); if (!csk) return NULL; csk->txdata_skb_cache = alloc_skb(TXDATA_SKB_LEN, GFP_ATOMIC); if (!csk->txdata_skb_cache) { kfree(csk); return NULL; } kref_init(&csk->kref); csk->cdev = cdev; skb_queue_head_init(&csk->txq); csk->wr_skb_head = NULL; csk->wr_skb_tail = NULL; csk->mss = MAX_MSS; csk->tlshws.ofld = 1; csk->tlshws.txkey = -1; csk->tlshws.rxkey = -1; csk->tlshws.mfs = TLS_MFS; skb_queue_head_init(&csk->tlshws.sk_recv_queue); return csk; } static void chtls_sock_release(struct kref *ref) { struct chtls_sock *csk = container_of(ref, struct chtls_sock, kref); kfree(csk); } static struct net_device *chtls_ipv4_netdev(struct chtls_dev *cdev, struct sock *sk) { struct net_device *ndev = cdev->ports[0]; if (likely(!inet_sk(sk)->inet_rcv_saddr)) return ndev; ndev = ip_dev_find(&init_net, inet_sk(sk)->inet_rcv_saddr); if (!ndev) return NULL; if (is_vlan_dev(ndev)) return vlan_dev_real_dev(ndev); return ndev; } static void assign_rxopt(struct sock *sk, unsigned int opt) { const struct chtls_dev *cdev; struct chtls_sock *csk; struct tcp_sock *tp; csk = rcu_dereference_sk_user_data(sk); tp = tcp_sk(sk); cdev = csk->cdev; tp->tcp_header_len = sizeof(struct tcphdr); tp->rx_opt.mss_clamp = cdev->mtus[TCPOPT_MSS_G(opt)] - 40; tp->mss_cache = tp->rx_opt.mss_clamp; tp->rx_opt.tstamp_ok = TCPOPT_TSTAMP_G(opt); tp->rx_opt.snd_wscale = TCPOPT_SACK_G(opt); tp->rx_opt.wscale_ok = TCPOPT_WSCALE_OK_G(opt); SND_WSCALE(tp) = TCPOPT_SND_WSCALE_G(opt); if (!tp->rx_opt.wscale_ok) tp->rx_opt.rcv_wscale = 0; if (tp->rx_opt.tstamp_ok) { tp->tcp_header_len += TCPOLEN_TSTAMP_ALIGNED; tp->rx_opt.mss_clamp -= TCPOLEN_TSTAMP_ALIGNED; } else if (csk->opt2 & TSTAMPS_EN_F) { csk->opt2 &= ~TSTAMPS_EN_F; csk->mtu_idx = TCPOPT_MSS_G(opt); } } static void chtls_purge_receive_queue(struct sock *sk) { struct sk_buff *skb; while ((skb = __skb_dequeue(&sk->sk_receive_queue)) != NULL) { skb_dst_set(skb, (void *)NULL); kfree_skb(skb); } } static void chtls_purge_write_queue(struct sock *sk) { struct chtls_sock *csk = rcu_dereference_sk_user_data(sk); struct sk_buff *skb; while ((skb = __skb_dequeue(&csk->txq))) { sk->sk_wmem_queued -= skb->truesize; __kfree_skb(skb); } } static void chtls_purge_recv_queue(struct sock *sk) { struct chtls_sock *csk = rcu_dereference_sk_user_data(sk); struct chtls_hws *tlsk = &csk->tlshws; struct sk_buff *skb; while ((skb = __skb_dequeue(&tlsk->sk_recv_queue)) != NULL) { skb_dst_set(skb, NULL); kfree_skb(skb); } } static void abort_arp_failure(void *handle, struct sk_buff *skb) { struct cpl_abort_req *req = cplhdr(skb); struct chtls_dev *cdev; cdev = (struct chtls_dev *)handle; req->cmd = CPL_ABORT_NO_RST; cxgb4_ofld_send(cdev->lldi->ports[0], skb); } static struct sk_buff *alloc_ctrl_skb(struct sk_buff *skb, int len) { if (likely(skb && !skb_shared(skb) && !skb_cloned(skb))) { __skb_trim(skb, 0); refcount_add(2, &skb->users); } else { skb = alloc_skb(len, GFP_KERNEL | __GFP_NOFAIL); } return skb; } static void chtls_send_abort(struct sock *sk, int mode, struct sk_buff *skb) { struct cpl_abort_req *req; struct chtls_sock *csk; struct tcp_sock *tp; csk = rcu_dereference_sk_user_data(sk); tp = tcp_sk(sk); if (!skb) skb = alloc_ctrl_skb(csk->txdata_skb_cache, sizeof(*req)); req = (struct cpl_abort_req *)skb_put(skb, sizeof(*req)); INIT_TP_WR_CPL(req, CPL_ABORT_REQ, csk->tid); skb_set_queue_mapping(skb, (csk->txq_idx << 1) | CPL_PRIORITY_DATA); req->rsvd0 = htonl(tp->snd_nxt); req->rsvd1 = !csk_flag_nochk(csk, CSK_TX_DATA_SENT); req->cmd = mode; t4_set_arp_err_handler(skb, csk->cdev, abort_arp_failure); send_or_defer(sk, tp, skb, mode == CPL_ABORT_SEND_RST); } static void chtls_send_reset(struct sock *sk, int mode, struct sk_buff *skb) { struct chtls_sock *csk = rcu_dereference_sk_user_data(sk); if (unlikely(csk_flag_nochk(csk, CSK_ABORT_SHUTDOWN) || !csk->cdev)) { if (sk->sk_state == TCP_SYN_RECV) csk_set_flag(csk, CSK_RST_ABORTED); goto out; } if (!csk_flag_nochk(csk, CSK_TX_DATA_SENT)) { struct tcp_sock *tp = tcp_sk(sk); if (send_tx_flowc_wr(sk, 0, tp->snd_nxt, tp->rcv_nxt) < 0) WARN_ONCE(1, "send tx flowc error"); csk_set_flag(csk, CSK_TX_DATA_SENT); } csk_set_flag(csk, CSK_ABORT_RPL_PENDING); chtls_purge_write_queue(sk); csk_set_flag(csk, CSK_ABORT_SHUTDOWN); if (sk->sk_state != TCP_SYN_RECV) chtls_send_abort(sk, mode, skb); else goto out; return; out: kfree_skb(skb); } static void release_tcp_port(struct sock *sk) { if (inet_csk(sk)->icsk_bind_hash) inet_put_port(sk); } static void tcp_uncork(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); if (tp->nonagle & TCP_NAGLE_CORK) { tp->nonagle &= ~TCP_NAGLE_CORK; chtls_tcp_push(sk, 0); } } static void chtls_close_conn(struct sock *sk) { struct cpl_close_con_req *req; struct chtls_sock *csk; struct sk_buff *skb; unsigned int tid; unsigned int len; len = roundup(sizeof(struct cpl_close_con_req), 16); csk = rcu_dereference_sk_user_data(sk); tid = csk->tid; skb = alloc_skb(len, GFP_KERNEL | __GFP_NOFAIL); req = (struct cpl_close_con_req *)__skb_put(skb, len); memset(req, 0, len); req->wr.wr_hi = htonl(FW_WR_OP_V(FW_TP_WR) | FW_WR_IMMDLEN_V(sizeof(*req) - sizeof(req->wr))); req->wr.wr_mid = htonl(FW_WR_LEN16_V(DIV_ROUND_UP(sizeof(*req), 16)) | FW_WR_FLOWID_V(tid)); OPCODE_TID(req) = htonl(MK_OPCODE_TID(CPL_CLOSE_CON_REQ, tid)); tcp_uncork(sk); skb_entail(sk, skb, ULPCB_FLAG_NO_HDR | ULPCB_FLAG_NO_APPEND); if (sk->sk_state != TCP_SYN_SENT) chtls_push_frames(csk, 1); } /* * Perform a state transition during close and return the actions indicated * for the transition. Do not make this function inline, the main reason * it exists at all is to avoid multiple inlining of tcp_set_state. */ static int make_close_transition(struct sock *sk) { int next = (int)new_state[sk->sk_state]; tcp_set_state(sk, next & TCP_STATE_MASK); return next & TCP_ACTION_FIN; } void chtls_close(struct sock *sk, long timeout) { int data_lost, prev_state; struct chtls_sock *csk; csk = rcu_dereference_sk_user_data(sk); lock_sock(sk); sk->sk_shutdown |= SHUTDOWN_MASK; data_lost = skb_queue_len(&sk->sk_receive_queue); data_lost |= skb_queue_len(&csk->tlshws.sk_recv_queue); chtls_purge_recv_queue(sk); chtls_purge_receive_queue(sk); if (sk->sk_state == TCP_CLOSE) { goto wait; } else if (data_lost || sk->sk_state == TCP_SYN_SENT) { chtls_send_reset(sk, CPL_ABORT_SEND_RST, NULL); release_tcp_port(sk); goto unlock; } else if (sock_flag(sk, SOCK_LINGER) && !sk->sk_lingertime) { sk->sk_prot->disconnect(sk, 0); } else if (make_close_transition(sk)) { chtls_close_conn(sk); } wait: if (timeout) sk_stream_wait_close(sk, timeout); unlock: prev_state = sk->sk_state; sock_hold(sk); sock_orphan(sk); release_sock(sk); local_bh_disable(); bh_lock_sock(sk); if (prev_state != TCP_CLOSE && sk->sk_state == TCP_CLOSE) goto out; if (sk->sk_state == TCP_FIN_WAIT2 && tcp_sk(sk)->linger2 < 0 && !csk_flag(sk, CSK_ABORT_SHUTDOWN)) { struct sk_buff *skb; skb = alloc_skb(sizeof(struct cpl_abort_req), GFP_ATOMIC); if (skb) chtls_send_reset(sk, CPL_ABORT_SEND_RST, skb); } if (sk->sk_state == TCP_CLOSE) inet_csk_destroy_sock(sk); out: bh_unlock_sock(sk); local_bh_enable(); sock_put(sk); } /* * Wait until a socket enters on of the given states. */ static int wait_for_states(struct sock *sk, unsigned int states) { DECLARE_WAITQUEUE(wait, current); struct socket_wq _sk_wq; long current_timeo; int err = 0; current_timeo = 200; /* * We want this to work even when there's no associated struct socket. * In that case we provide a temporary wait_queue_head_t. */ if (!sk->sk_wq) { init_waitqueue_head(&_sk_wq.wait); _sk_wq.fasync_list = NULL; init_rcu_head_on_stack(&_sk_wq.rcu); RCU_INIT_POINTER(sk->sk_wq, &_sk_wq); } add_wait_queue(sk_sleep(sk), &wait); while (!sk_in_state(sk, states)) { if (!current_timeo) { err = -EBUSY; break; } if (signal_pending(current)) { err = sock_intr_errno(current_timeo); break; } set_current_state(TASK_UNINTERRUPTIBLE); release_sock(sk); if (!sk_in_state(sk, states)) current_timeo = schedule_timeout(current_timeo); __set_current_state(TASK_RUNNING); lock_sock(sk); } remove_wait_queue(sk_sleep(sk), &wait); if (rcu_dereference(sk->sk_wq) == &_sk_wq) sk->sk_wq = NULL; return err; } int chtls_disconnect(struct sock *sk, int flags) { struct tcp_sock *tp; int err; tp = tcp_sk(sk); chtls_purge_recv_queue(sk); chtls_purge_receive_queue(sk); chtls_purge_write_queue(sk); if (sk->sk_state != TCP_CLOSE) { sk->sk_err = ECONNRESET; chtls_send_reset(sk, CPL_ABORT_SEND_RST, NULL); err = wait_for_states(sk, TCPF_CLOSE); if (err) return err; } chtls_purge_recv_queue(sk); chtls_purge_receive_queue(sk); tp->max_window = 0xFFFF << (tp->rx_opt.snd_wscale); return tcp_disconnect(sk, flags); } #define SHUTDOWN_ELIGIBLE_STATE (TCPF_ESTABLISHED | \ TCPF_SYN_RECV | TCPF_CLOSE_WAIT) void chtls_shutdown(struct sock *sk, int how) { if ((how & SEND_SHUTDOWN) && sk_in_state(sk, SHUTDOWN_ELIGIBLE_STATE) && make_close_transition(sk)) chtls_close_conn(sk); } void chtls_destroy_sock(struct sock *sk) { struct chtls_sock *csk; csk = rcu_dereference_sk_user_data(sk); chtls_purge_recv_queue(sk); csk->ulp_mode = ULP_MODE_NONE; chtls_purge_write_queue(sk); free_tls_keyid(sk); kref_put(&csk->kref, chtls_sock_release); sk->sk_prot = &tcp_prot; sk->sk_prot->destroy(sk); } static void reset_listen_child(struct sock *child) { struct chtls_sock *csk = rcu_dereference_sk_user_data(child); struct sk_buff *skb; skb = alloc_ctrl_skb(csk->txdata_skb_cache, sizeof(struct cpl_abort_req)); chtls_send_reset(child, CPL_ABORT_SEND_RST, skb); sock_orphan(child); INC_ORPHAN_COUNT(child); if (child->sk_state == TCP_CLOSE) inet_csk_destroy_sock(child); } static void chtls_disconnect_acceptq(struct sock *listen_sk) { struct request_sock **pprev; pprev = ACCEPT_QUEUE(listen_sk); while (*pprev) { struct request_sock *req = *pprev; if (req->rsk_ops == &chtls_rsk_ops) { struct sock *child = req->sk; *pprev = req->dl_next; sk_acceptq_removed(listen_sk); reqsk_put(req); sock_hold(child); local_bh_disable(); bh_lock_sock(child); release_tcp_port(child); reset_listen_child(child); bh_unlock_sock(child); local_bh_enable(); sock_put(child); } else { pprev = &req->dl_next; } } } static int listen_hashfn(const struct sock *sk) { return ((unsigned long)sk >> 10) & (LISTEN_INFO_HASH_SIZE - 1); } static struct listen_info *listen_hash_add(struct chtls_dev *cdev, struct sock *sk, unsigned int stid) { struct listen_info *p = kmalloc(sizeof(*p), GFP_KERNEL); if (p) { int key = listen_hashfn(sk); p->sk = sk; p->stid = stid; spin_lock(&cdev->listen_lock); p->next = cdev->listen_hash_tab[key]; cdev->listen_hash_tab[key] = p; spin_unlock(&cdev->listen_lock); } return p; } static int listen_hash_find(struct chtls_dev *cdev, struct sock *sk) { struct listen_info *p; int stid = -1; int key; key = listen_hashfn(sk); spin_lock(&cdev->listen_lock); for (p = cdev->listen_hash_tab[key]; p; p = p->next) if (p->sk == sk) { stid = p->stid; break; } spin_unlock(&cdev->listen_lock); return stid; } static int listen_hash_del(struct chtls_dev *cdev, struct sock *sk) { struct listen_info *p, **prev; int stid = -1; int key; key = listen_hashfn(sk); prev = &cdev->listen_hash_tab[key]; spin_lock(&cdev->listen_lock); for (p = *prev; p; prev = &p->next, p = p->next) if (p->sk == sk) { stid = p->stid; *prev = p->next; kfree(p); break; } spin_unlock(&cdev->listen_lock); return stid; } static void cleanup_syn_rcv_conn(struct sock *child, struct sock *parent) { struct request_sock *req; struct chtls_sock *csk; csk = rcu_dereference_sk_user_data(child); req = csk->passive_reap_next; reqsk_queue_removed(&inet_csk(parent)->icsk_accept_queue, req); __skb_unlink((struct sk_buff *)&csk->synq, &csk->listen_ctx->synq); chtls_reqsk_free(req); csk->passive_reap_next = NULL; } static void chtls_reset_synq(struct listen_ctx *listen_ctx) { struct sock *listen_sk = listen_ctx->lsk; while (!skb_queue_empty(&listen_ctx->synq)) { struct chtls_sock *csk = container_of((struct synq *)__skb_dequeue (&listen_ctx->synq), struct chtls_sock, synq); struct sock *child = csk->sk; cleanup_syn_rcv_conn(child, listen_sk); sock_hold(child); local_bh_disable(); bh_lock_sock(child); release_tcp_port(child); reset_listen_child(child); bh_unlock_sock(child); local_bh_enable(); sock_put(child); } } int chtls_listen_start(struct chtls_dev *cdev, struct sock *sk) { struct net_device *ndev; struct listen_ctx *ctx; struct adapter *adap; struct port_info *pi; int stid; int ret; if (sk->sk_family != PF_INET) return -EAGAIN; rcu_read_lock(); ndev = chtls_ipv4_netdev(cdev, sk); rcu_read_unlock(); if (!ndev) return -EBADF; pi = netdev_priv(ndev); adap = pi->adapter; if (!(adap->flags & CXGB4_FULL_INIT_DONE)) return -EBADF; if (listen_hash_find(cdev, sk) >= 0) /* already have it */ return -EADDRINUSE; ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); if (!ctx) return -ENOMEM; __module_get(THIS_MODULE); ctx->lsk = sk; ctx->cdev = cdev; ctx->state = T4_LISTEN_START_PENDING; skb_queue_head_init(&ctx->synq); stid = cxgb4_alloc_stid(cdev->tids, sk->sk_family, ctx); if (stid < 0) goto free_ctx; sock_hold(sk); if (!listen_hash_add(cdev, sk, stid)) goto free_stid; ret = cxgb4_create_server(ndev, stid, inet_sk(sk)->inet_rcv_saddr, inet_sk(sk)->inet_sport, 0, cdev->lldi->rxq_ids[0]); if (ret > 0) ret = net_xmit_errno(ret); if (ret) goto del_hash; return 0; del_hash: listen_hash_del(cdev, sk); free_stid: cxgb4_free_stid(cdev->tids, stid, sk->sk_family); sock_put(sk); free_ctx: kfree(ctx); module_put(THIS_MODULE); return -EBADF; } void chtls_listen_stop(struct chtls_dev *cdev, struct sock *sk) { struct listen_ctx *listen_ctx; int stid; stid = listen_hash_del(cdev, sk); if (stid < 0) return; listen_ctx = (struct listen_ctx *)lookup_stid(cdev->tids, stid); chtls_reset_synq(listen_ctx); cxgb4_remove_server(cdev->lldi->ports[0], stid, cdev->lldi->rxq_ids[0], 0); chtls_disconnect_acceptq(sk); } static int chtls_pass_open_rpl(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_pass_open_rpl *rpl = cplhdr(skb) + RSS_HDR; unsigned int stid = GET_TID(rpl); struct listen_ctx *listen_ctx; listen_ctx = (struct listen_ctx *)lookup_stid(cdev->tids, stid); if (!listen_ctx) return CPL_RET_BUF_DONE; if (listen_ctx->state == T4_LISTEN_START_PENDING) { listen_ctx->state = T4_LISTEN_STARTED; return CPL_RET_BUF_DONE; } if (rpl->status != CPL_ERR_NONE) { pr_info("Unexpected PASS_OPEN_RPL status %u for STID %u\n", rpl->status, stid); return CPL_RET_BUF_DONE; } cxgb4_free_stid(cdev->tids, stid, listen_ctx->lsk->sk_family); sock_put(listen_ctx->lsk); kfree(listen_ctx); module_put(THIS_MODULE); return 0; } static int chtls_close_listsrv_rpl(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_close_listsvr_rpl *rpl = cplhdr(skb) + RSS_HDR; struct listen_ctx *listen_ctx; unsigned int stid; void *data; stid = GET_TID(rpl); data = lookup_stid(cdev->tids, stid); listen_ctx = (struct listen_ctx *)data; if (rpl->status != CPL_ERR_NONE) { pr_info("Unexpected CLOSE_LISTSRV_RPL status %u for STID %u\n", rpl->status, stid); return CPL_RET_BUF_DONE; } cxgb4_free_stid(cdev->tids, stid, listen_ctx->lsk->sk_family); sock_put(listen_ctx->lsk); kfree(listen_ctx); module_put(THIS_MODULE); return 0; } static void chtls_release_resources(struct sock *sk) { struct chtls_sock *csk = rcu_dereference_sk_user_data(sk); struct chtls_dev *cdev = csk->cdev; unsigned int tid = csk->tid; struct tid_info *tids; if (!cdev) return; tids = cdev->tids; kfree_skb(csk->txdata_skb_cache); csk->txdata_skb_cache = NULL; if (csk->l2t_entry) { cxgb4_l2t_release(csk->l2t_entry); csk->l2t_entry = NULL; } cxgb4_remove_tid(tids, csk->port_id, tid, sk->sk_family); sock_put(sk); } static void chtls_conn_done(struct sock *sk) { if (sock_flag(sk, SOCK_DEAD)) chtls_purge_receive_queue(sk); sk_wakeup_sleepers(sk, 0); tcp_done(sk); } static void do_abort_syn_rcv(struct sock *child, struct sock *parent) { /* * If the server is still open we clean up the child connection, * otherwise the server already did the clean up as it was purging * its SYN queue and the skb was just sitting in its backlog. */ if (likely(parent->sk_state == TCP_LISTEN)) { cleanup_syn_rcv_conn(child, parent); /* Without the below call to sock_orphan, * we leak the socket resource with syn_flood test * as inet_csk_destroy_sock will not be called * in tcp_done since SOCK_DEAD flag is not set. * Kernel handles this differently where new socket is * created only after 3 way handshake is done. */ sock_orphan(child); percpu_counter_inc((child)->sk_prot->orphan_count); chtls_release_resources(child); chtls_conn_done(child); } else { if (csk_flag(child, CSK_RST_ABORTED)) { chtls_release_resources(child); chtls_conn_done(child); } } } static void pass_open_abort(struct sock *child, struct sock *parent, struct sk_buff *skb) { do_abort_syn_rcv(child, parent); kfree_skb(skb); } static void bl_pass_open_abort(struct sock *lsk, struct sk_buff *skb) { pass_open_abort(skb->sk, lsk, skb); } static void chtls_pass_open_arp_failure(struct sock *sk, struct sk_buff *skb) { const struct request_sock *oreq; struct chtls_sock *csk; struct chtls_dev *cdev; struct sock *parent; void *data; csk = rcu_dereference_sk_user_data(sk); cdev = csk->cdev; /* * If the connection is being aborted due to the parent listening * socket going away there's nothing to do, the ABORT_REQ will close * the connection. */ if (csk_flag(sk, CSK_ABORT_RPL_PENDING)) { kfree_skb(skb); return; } oreq = csk->passive_reap_next; data = lookup_stid(cdev->tids, oreq->ts_recent); parent = ((struct listen_ctx *)data)->lsk; bh_lock_sock(parent); if (!sock_owned_by_user(parent)) { pass_open_abort(sk, parent, skb); } else { BLOG_SKB_CB(skb)->backlog_rcv = bl_pass_open_abort; __sk_add_backlog(parent, skb); } bh_unlock_sock(parent); } static void chtls_accept_rpl_arp_failure(void *handle, struct sk_buff *skb) { struct sock *sk = (struct sock *)handle; sock_hold(sk); process_cpl_msg(chtls_pass_open_arp_failure, sk, skb); sock_put(sk); } static unsigned int chtls_select_mss(const struct chtls_sock *csk, unsigned int pmtu, struct cpl_pass_accept_req *req) { struct chtls_dev *cdev; struct dst_entry *dst; unsigned int tcpoptsz; unsigned int iphdrsz; unsigned int mtu_idx; struct tcp_sock *tp; unsigned int mss; struct sock *sk; mss = ntohs(req->tcpopt.mss); sk = csk->sk; dst = __sk_dst_get(sk); cdev = csk->cdev; tp = tcp_sk(sk); tcpoptsz = 0; iphdrsz = sizeof(struct iphdr) + sizeof(struct tcphdr); if (req->tcpopt.tstamp) tcpoptsz += round_up(TCPOLEN_TIMESTAMP, 4); tp->advmss = dst_metric_advmss(dst); if (USER_MSS(tp) && tp->advmss > USER_MSS(tp)) tp->advmss = USER_MSS(tp); if (tp->advmss > pmtu - iphdrsz) tp->advmss = pmtu - iphdrsz; if (mss && tp->advmss > mss) tp->advmss = mss; tp->advmss = cxgb4_best_aligned_mtu(cdev->lldi->mtus, iphdrsz + tcpoptsz, tp->advmss - tcpoptsz, 8, &mtu_idx); tp->advmss -= iphdrsz; inet_csk(sk)->icsk_pmtu_cookie = pmtu; return mtu_idx; } static unsigned int select_rcv_wscale(int space, int wscale_ok, int win_clamp) { int wscale = 0; if (space > MAX_RCV_WND) space = MAX_RCV_WND; if (win_clamp && win_clamp < space) space = win_clamp; if (wscale_ok) { while (wscale < 14 && (65535 << wscale) < space) wscale++; } return wscale; } static void chtls_pass_accept_rpl(struct sk_buff *skb, struct cpl_pass_accept_req *req, unsigned int tid) { struct cpl_t5_pass_accept_rpl *rpl5; struct cxgb4_lld_info *lldi; const struct tcphdr *tcph; const struct tcp_sock *tp; struct chtls_sock *csk; unsigned int len; struct sock *sk; u32 opt2, hlen; u64 opt0; sk = skb->sk; tp = tcp_sk(sk); csk = sk->sk_user_data; csk->tid = tid; lldi = csk->cdev->lldi; len = roundup(sizeof(*rpl5), 16); rpl5 = __skb_put_zero(skb, len); INIT_TP_WR(rpl5, tid); OPCODE_TID(rpl5) = cpu_to_be32(MK_OPCODE_TID(CPL_PASS_ACCEPT_RPL, csk->tid)); csk->mtu_idx = chtls_select_mss(csk, dst_mtu(__sk_dst_get(sk)), req); opt0 = TCAM_BYPASS_F | WND_SCALE_V(RCV_WSCALE(tp)) | MSS_IDX_V(csk->mtu_idx) | L2T_IDX_V(csk->l2t_entry->idx) | NAGLE_V(!(tp->nonagle & TCP_NAGLE_OFF)) | TX_CHAN_V(csk->tx_chan) | SMAC_SEL_V(csk->smac_idx) | DSCP_V(csk->tos >> 2) | ULP_MODE_V(ULP_MODE_TLS) | RCV_BUFSIZ_V(min(tp->rcv_wnd >> 10, RCV_BUFSIZ_M)); opt2 = RX_CHANNEL_V(0) | RSS_QUEUE_VALID_F | RSS_QUEUE_V(csk->rss_qid); if (!is_t5(lldi->adapter_type)) opt2 |= RX_FC_DISABLE_F; if (req->tcpopt.tstamp) opt2 |= TSTAMPS_EN_F; if (req->tcpopt.sack) opt2 |= SACK_EN_F; hlen = ntohl(req->hdr_len); tcph = (struct tcphdr *)((u8 *)(req + 1) + T6_ETH_HDR_LEN_G(hlen) + T6_IP_HDR_LEN_G(hlen)); if (tcph->ece && tcph->cwr) opt2 |= CCTRL_ECN_V(1); opt2 |= CONG_CNTRL_V(CONG_ALG_NEWRENO); opt2 |= T5_ISS_F; opt2 |= T5_OPT_2_VALID_F; rpl5->opt0 = cpu_to_be64(opt0); rpl5->opt2 = cpu_to_be32(opt2); rpl5->iss = cpu_to_be32((prandom_u32() & ~7UL) - 1); set_wr_txq(skb, CPL_PRIORITY_SETUP, csk->port_id); t4_set_arp_err_handler(skb, sk, chtls_accept_rpl_arp_failure); cxgb4_l2t_send(csk->egress_dev, skb, csk->l2t_entry); } static void inet_inherit_port(struct inet_hashinfo *hash_info, struct sock *lsk, struct sock *newsk) { local_bh_disable(); __inet_inherit_port(lsk, newsk); local_bh_enable(); } static int chtls_backlog_rcv(struct sock *sk, struct sk_buff *skb) { if (skb->protocol) { kfree_skb(skb); return 0; } BLOG_SKB_CB(skb)->backlog_rcv(sk, skb); return 0; } static void chtls_set_tcp_window(struct chtls_sock *csk) { struct net_device *ndev = csk->egress_dev; struct port_info *pi = netdev_priv(ndev); unsigned int linkspeed; u8 scale; linkspeed = pi->link_cfg.speed; scale = linkspeed / SPEED_10000; #define CHTLS_10G_RCVWIN (256 * 1024) csk->rcv_win = CHTLS_10G_RCVWIN; if (scale) csk->rcv_win *= scale; #define CHTLS_10G_SNDWIN (256 * 1024) csk->snd_win = CHTLS_10G_SNDWIN; if (scale) csk->snd_win *= scale; } static struct sock *chtls_recv_sock(struct sock *lsk, struct request_sock *oreq, void *network_hdr, const struct cpl_pass_accept_req *req, struct chtls_dev *cdev) { struct inet_sock *newinet; const struct iphdr *iph; struct tls_context *ctx; struct net_device *ndev; struct chtls_sock *csk; struct dst_entry *dst; struct neighbour *n; struct tcp_sock *tp; struct sock *newsk; u16 port_id; int rxq_idx; int step; iph = (const struct iphdr *)network_hdr; newsk = tcp_create_openreq_child(lsk, oreq, cdev->askb); if (!newsk) goto free_oreq; dst = inet_csk_route_child_sock(lsk, newsk, oreq); if (!dst) goto free_sk; n = dst_neigh_lookup(dst, &iph->saddr); if (!n) goto free_sk; ndev = n->dev; if (!ndev) goto free_dst; port_id = cxgb4_port_idx(ndev); csk = chtls_sock_create(cdev); if (!csk) goto free_dst; csk->l2t_entry = cxgb4_l2t_get(cdev->lldi->l2t, n, ndev, 0); if (!csk->l2t_entry) goto free_csk; newsk->sk_user_data = csk; newsk->sk_backlog_rcv = chtls_backlog_rcv; tp = tcp_sk(newsk); newinet = inet_sk(newsk); newinet->inet_daddr = iph->saddr; newinet->inet_rcv_saddr = iph->daddr; newinet->inet_saddr = iph->daddr; oreq->ts_recent = PASS_OPEN_TID_G(ntohl(req->tos_stid)); sk_setup_caps(newsk, dst); ctx = tls_get_ctx(lsk); newsk->sk_destruct = ctx->sk_destruct; csk->sk = newsk; csk->passive_reap_next = oreq; csk->tx_chan = cxgb4_port_chan(ndev); csk->port_id = port_id; csk->egress_dev = ndev; csk->tos = PASS_OPEN_TOS_G(ntohl(req->tos_stid)); chtls_set_tcp_window(csk); tp->rcv_wnd = csk->rcv_win; csk->sndbuf = csk->snd_win; csk->ulp_mode = ULP_MODE_TLS; step = cdev->lldi->nrxq / cdev->lldi->nchan; csk->rss_qid = cdev->lldi->rxq_ids[port_id * step]; rxq_idx = port_id * step; csk->txq_idx = (rxq_idx < cdev->lldi->ntxq) ? rxq_idx : port_id * step; csk->sndbuf = newsk->sk_sndbuf; csk->smac_idx = ((struct port_info *)netdev_priv(ndev))->smt_idx; RCV_WSCALE(tp) = select_rcv_wscale(tcp_full_space(newsk), sock_net(newsk)-> ipv4.sysctl_tcp_window_scaling, tp->window_clamp); neigh_release(n); inet_inherit_port(&tcp_hashinfo, lsk, newsk); csk_set_flag(csk, CSK_CONN_INLINE); bh_unlock_sock(newsk); /* tcp_create_openreq_child ->sk_clone_lock */ return newsk; free_csk: chtls_sock_release(&csk->kref); free_dst: dst_release(dst); free_sk: inet_csk_prepare_forced_close(newsk); tcp_done(newsk); free_oreq: chtls_reqsk_free(oreq); return NULL; } /* * Populate a TID_RELEASE WR. The skb must be already propely sized. */ static void mk_tid_release(struct sk_buff *skb, unsigned int chan, unsigned int tid) { struct cpl_tid_release *req; unsigned int len; len = roundup(sizeof(struct cpl_tid_release), 16); req = (struct cpl_tid_release *)__skb_put(skb, len); memset(req, 0, len); set_wr_txq(skb, CPL_PRIORITY_SETUP, chan); INIT_TP_WR_CPL(req, CPL_TID_RELEASE, tid); } static int chtls_get_module(struct sock *sk) { struct inet_connection_sock *icsk = inet_csk(sk); if (!try_module_get(icsk->icsk_ulp_ops->owner)) return -1; return 0; } static void chtls_pass_accept_request(struct sock *sk, struct sk_buff *skb) { struct cpl_t5_pass_accept_rpl *rpl; struct cpl_pass_accept_req *req; struct listen_ctx *listen_ctx; struct vlan_ethhdr *vlan_eh; struct request_sock *oreq; struct sk_buff *reply_skb; struct chtls_sock *csk; struct chtls_dev *cdev; struct tcphdr *tcph; struct sock *newsk; struct ethhdr *eh; struct iphdr *iph; void *network_hdr; unsigned int stid; unsigned int len; unsigned int tid; bool th_ecn, ect; __u8 ip_dsfield; /* IPv4 tos or IPv6 dsfield */ u16 eth_hdr_len; bool ecn_ok; req = cplhdr(skb) + RSS_HDR; tid = GET_TID(req); cdev = BLOG_SKB_CB(skb)->cdev; newsk = lookup_tid(cdev->tids, tid); stid = PASS_OPEN_TID_G(ntohl(req->tos_stid)); if (newsk) { pr_info("tid (%d) already in use\n", tid); return; } len = roundup(sizeof(*rpl), 16); reply_skb = alloc_skb(len, GFP_ATOMIC); if (!reply_skb) { cxgb4_remove_tid(cdev->tids, 0, tid, sk->sk_family); kfree_skb(skb); return; } if (sk->sk_state != TCP_LISTEN) goto reject; if (inet_csk_reqsk_queue_is_full(sk)) goto reject; if (sk_acceptq_is_full(sk)) goto reject; oreq = inet_reqsk_alloc(&chtls_rsk_ops, sk, true); if (!oreq) goto reject; oreq->rsk_rcv_wnd = 0; oreq->rsk_window_clamp = 0; oreq->cookie_ts = 0; oreq->mss = 0; oreq->ts_recent = 0; eth_hdr_len = T6_ETH_HDR_LEN_G(ntohl(req->hdr_len)); if (eth_hdr_len == ETH_HLEN) { eh = (struct ethhdr *)(req + 1); iph = (struct iphdr *)(eh + 1); network_hdr = (void *)(eh + 1); } else { vlan_eh = (struct vlan_ethhdr *)(req + 1); iph = (struct iphdr *)(vlan_eh + 1); network_hdr = (void *)(vlan_eh + 1); } if (iph->version != 0x4) goto free_oreq; tcph = (struct tcphdr *)(iph + 1); skb_set_network_header(skb, (void *)iph - (void *)req); tcp_rsk(oreq)->tfo_listener = false; tcp_rsk(oreq)->rcv_isn = ntohl(tcph->seq); chtls_set_req_port(oreq, tcph->source, tcph->dest); chtls_set_req_addr(oreq, iph->daddr, iph->saddr); ip_dsfield = ipv4_get_dsfield(iph); if (req->tcpopt.wsf <= 14 && sock_net(sk)->ipv4.sysctl_tcp_window_scaling) { inet_rsk(oreq)->wscale_ok = 1; inet_rsk(oreq)->snd_wscale = req->tcpopt.wsf; } inet_rsk(oreq)->ir_iif = sk->sk_bound_dev_if; th_ecn = tcph->ece && tcph->cwr; if (th_ecn) { ect = !INET_ECN_is_not_ect(ip_dsfield); ecn_ok = sock_net(sk)->ipv4.sysctl_tcp_ecn; if ((!ect && ecn_ok) || tcp_ca_needs_ecn(sk)) inet_rsk(oreq)->ecn_ok = 1; } newsk = chtls_recv_sock(sk, oreq, network_hdr, req, cdev); if (!newsk) goto reject; if (chtls_get_module(newsk)) goto reject; inet_csk_reqsk_queue_added(sk); reply_skb->sk = newsk; chtls_install_cpl_ops(newsk); cxgb4_insert_tid(cdev->tids, newsk, tid, newsk->sk_family); csk = rcu_dereference_sk_user_data(newsk); listen_ctx = (struct listen_ctx *)lookup_stid(cdev->tids, stid); csk->listen_ctx = listen_ctx; __skb_queue_tail(&listen_ctx->synq, (struct sk_buff *)&csk->synq); chtls_pass_accept_rpl(reply_skb, req, tid); kfree_skb(skb); return; free_oreq: chtls_reqsk_free(oreq); reject: mk_tid_release(reply_skb, 0, tid); cxgb4_ofld_send(cdev->lldi->ports[0], reply_skb); kfree_skb(skb); } /* * Handle a CPL_PASS_ACCEPT_REQ message. */ static int chtls_pass_accept_req(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_pass_accept_req *req = cplhdr(skb) + RSS_HDR; struct listen_ctx *ctx; unsigned int stid; unsigned int tid; struct sock *lsk; void *data; stid = PASS_OPEN_TID_G(ntohl(req->tos_stid)); tid = GET_TID(req); data = lookup_stid(cdev->tids, stid); if (!data) return 1; ctx = (struct listen_ctx *)data; lsk = ctx->lsk; if (unlikely(tid >= cdev->tids->ntids)) { pr_info("passive open TID %u too large\n", tid); return 1; } BLOG_SKB_CB(skb)->cdev = cdev; process_cpl_msg(chtls_pass_accept_request, lsk, skb); return 0; } /* * Completes some final bits of initialization for just established connections * and changes their state to TCP_ESTABLISHED. * * snd_isn here is the ISN after the SYN, i.e., the true ISN + 1. */ static void make_established(struct sock *sk, u32 snd_isn, unsigned int opt) { struct tcp_sock *tp = tcp_sk(sk); tp->pushed_seq = snd_isn; tp->write_seq = snd_isn; tp->snd_nxt = snd_isn; tp->snd_una = snd_isn; inet_sk(sk)->inet_id = tp->write_seq ^ jiffies; assign_rxopt(sk, opt); if (tp->rcv_wnd > (RCV_BUFSIZ_M << 10)) tp->rcv_wup -= tp->rcv_wnd - (RCV_BUFSIZ_M << 10); smp_mb(); tcp_set_state(sk, TCP_ESTABLISHED); } static void chtls_abort_conn(struct sock *sk, struct sk_buff *skb) { struct sk_buff *abort_skb; abort_skb = alloc_skb(sizeof(struct cpl_abort_req), GFP_ATOMIC); if (abort_skb) chtls_send_reset(sk, CPL_ABORT_SEND_RST, abort_skb); } static struct sock *reap_list; static DEFINE_SPINLOCK(reap_list_lock); /* * Process the reap list. */ DECLARE_TASK_FUNC(process_reap_list, task_param) { spin_lock_bh(&reap_list_lock); while (reap_list) { struct sock *sk = reap_list; struct chtls_sock *csk = rcu_dereference_sk_user_data(sk); reap_list = csk->passive_reap_next; csk->passive_reap_next = NULL; spin_unlock(&reap_list_lock); sock_hold(sk); bh_lock_sock(sk); chtls_abort_conn(sk, NULL); sock_orphan(sk); if (sk->sk_state == TCP_CLOSE) inet_csk_destroy_sock(sk); bh_unlock_sock(sk); sock_put(sk); spin_lock(&reap_list_lock); } spin_unlock_bh(&reap_list_lock); } static DECLARE_WORK(reap_task, process_reap_list); static void add_to_reap_list(struct sock *sk) { struct chtls_sock *csk = sk->sk_user_data; local_bh_disable(); bh_lock_sock(sk); release_tcp_port(sk); /* release the port immediately */ spin_lock(&reap_list_lock); csk->passive_reap_next = reap_list; reap_list = sk; if (!csk->passive_reap_next) schedule_work(&reap_task); spin_unlock(&reap_list_lock); bh_unlock_sock(sk); local_bh_enable(); } static void add_pass_open_to_parent(struct sock *child, struct sock *lsk, struct chtls_dev *cdev) { struct request_sock *oreq; struct chtls_sock *csk; if (lsk->sk_state != TCP_LISTEN) return; csk = child->sk_user_data; oreq = csk->passive_reap_next; csk->passive_reap_next = NULL; reqsk_queue_removed(&inet_csk(lsk)->icsk_accept_queue, oreq); __skb_unlink((struct sk_buff *)&csk->synq, &csk->listen_ctx->synq); if (sk_acceptq_is_full(lsk)) { chtls_reqsk_free(oreq); add_to_reap_list(child); } else { refcount_set(&oreq->rsk_refcnt, 1); inet_csk_reqsk_queue_add(lsk, oreq, child); lsk->sk_data_ready(lsk); } } static void bl_add_pass_open_to_parent(struct sock *lsk, struct sk_buff *skb) { struct sock *child = skb->sk; skb->sk = NULL; add_pass_open_to_parent(child, lsk, BLOG_SKB_CB(skb)->cdev); kfree_skb(skb); } static int chtls_pass_establish(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_pass_establish *req = cplhdr(skb) + RSS_HDR; struct chtls_sock *csk; struct sock *lsk, *sk; unsigned int hwtid; hwtid = GET_TID(req); sk = lookup_tid(cdev->tids, hwtid); if (!sk) return (CPL_RET_UNKNOWN_TID | CPL_RET_BUF_DONE); bh_lock_sock(sk); if (unlikely(sock_owned_by_user(sk))) { kfree_skb(skb); } else { unsigned int stid; void *data; csk = sk->sk_user_data; csk->wr_max_credits = 64; csk->wr_credits = 64; csk->wr_unacked = 0; make_established(sk, ntohl(req->snd_isn), ntohs(req->tcp_opt)); stid = PASS_OPEN_TID_G(ntohl(req->tos_stid)); sk->sk_state_change(sk); if (unlikely(sk->sk_socket)) sk_wake_async(sk, 0, POLL_OUT); data = lookup_stid(cdev->tids, stid); lsk = ((struct listen_ctx *)data)->lsk; bh_lock_sock(lsk); if (unlikely(skb_queue_empty(&csk->listen_ctx->synq))) { /* removed from synq */ bh_unlock_sock(lsk); kfree_skb(skb); goto unlock; } if (likely(!sock_owned_by_user(lsk))) { kfree_skb(skb); add_pass_open_to_parent(sk, lsk, cdev); } else { skb->sk = sk; BLOG_SKB_CB(skb)->cdev = cdev; BLOG_SKB_CB(skb)->backlog_rcv = bl_add_pass_open_to_parent; __sk_add_backlog(lsk, skb); } bh_unlock_sock(lsk); } unlock: bh_unlock_sock(sk); return 0; } /* * Handle receipt of an urgent pointer. */ static void handle_urg_ptr(struct sock *sk, u32 urg_seq) { struct tcp_sock *tp = tcp_sk(sk); urg_seq--; if (tp->urg_data && !after(urg_seq, tp->urg_seq)) return; /* duplicate pointer */ sk_send_sigurg(sk); if (tp->urg_seq == tp->copied_seq && tp->urg_data && !sock_flag(sk, SOCK_URGINLINE) && tp->copied_seq != tp->rcv_nxt) { struct sk_buff *skb = skb_peek(&sk->sk_receive_queue); tp->copied_seq++; if (skb && tp->copied_seq - ULP_SKB_CB(skb)->seq >= skb->len) chtls_free_skb(sk, skb); } tp->urg_data = TCP_URG_NOTYET; tp->urg_seq = urg_seq; } static void check_sk_callbacks(struct chtls_sock *csk) { struct sock *sk = csk->sk; if (unlikely(sk->sk_user_data && !csk_flag_nochk(csk, CSK_CALLBACKS_CHKD))) csk_set_flag(csk, CSK_CALLBACKS_CHKD); } /* * Handles Rx data that arrives in a state where the socket isn't accepting * new data. */ static void handle_excess_rx(struct sock *sk, struct sk_buff *skb) { if (!csk_flag(sk, CSK_ABORT_SHUTDOWN)) chtls_abort_conn(sk, skb); kfree_skb(skb); } static void chtls_recv_data(struct sock *sk, struct sk_buff *skb) { struct cpl_rx_data *hdr = cplhdr(skb) + RSS_HDR; struct chtls_sock *csk; struct tcp_sock *tp; csk = rcu_dereference_sk_user_data(sk); tp = tcp_sk(sk); if (unlikely(sk->sk_shutdown & RCV_SHUTDOWN)) { handle_excess_rx(sk, skb); return; } ULP_SKB_CB(skb)->seq = ntohl(hdr->seq); ULP_SKB_CB(skb)->psh = hdr->psh; skb_ulp_mode(skb) = ULP_MODE_NONE; skb_reset_transport_header(skb); __skb_pull(skb, sizeof(*hdr) + RSS_HDR); if (!skb->data_len) __skb_trim(skb, ntohs(hdr->len)); if (unlikely(hdr->urg)) handle_urg_ptr(sk, tp->rcv_nxt + ntohs(hdr->urg)); if (unlikely(tp->urg_data == TCP_URG_NOTYET && tp->urg_seq - tp->rcv_nxt < skb->len)) tp->urg_data = TCP_URG_VALID | skb->data[tp->urg_seq - tp->rcv_nxt]; if (unlikely(hdr->dack_mode != csk->delack_mode)) { csk->delack_mode = hdr->dack_mode; csk->delack_seq = tp->rcv_nxt; } tcp_hdr(skb)->fin = 0; tp->rcv_nxt += skb->len; __skb_queue_tail(&sk->sk_receive_queue, skb); if (!sock_flag(sk, SOCK_DEAD)) { check_sk_callbacks(csk); sk->sk_data_ready(sk); } } static int chtls_rx_data(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_rx_data *req = cplhdr(skb) + RSS_HDR; unsigned int hwtid = GET_TID(req); struct sock *sk; sk = lookup_tid(cdev->tids, hwtid); if (unlikely(!sk)) { pr_err("can't find conn. for hwtid %u.\n", hwtid); return -EINVAL; } skb_dst_set(skb, NULL); process_cpl_msg(chtls_recv_data, sk, skb); return 0; } static void chtls_recv_pdu(struct sock *sk, struct sk_buff *skb) { struct cpl_tls_data *hdr = cplhdr(skb); struct chtls_sock *csk; struct chtls_hws *tlsk; struct tcp_sock *tp; csk = rcu_dereference_sk_user_data(sk); tlsk = &csk->tlshws; tp = tcp_sk(sk); if (unlikely(sk->sk_shutdown & RCV_SHUTDOWN)) { handle_excess_rx(sk, skb); return; } ULP_SKB_CB(skb)->seq = ntohl(hdr->seq); ULP_SKB_CB(skb)->flags = 0; skb_ulp_mode(skb) = ULP_MODE_TLS; skb_reset_transport_header(skb); __skb_pull(skb, sizeof(*hdr)); if (!skb->data_len) __skb_trim(skb, CPL_TLS_DATA_LENGTH_G(ntohl(hdr->length_pkd))); if (unlikely(tp->urg_data == TCP_URG_NOTYET && tp->urg_seq - tp->rcv_nxt < skb->len)) tp->urg_data = TCP_URG_VALID | skb->data[tp->urg_seq - tp->rcv_nxt]; tcp_hdr(skb)->fin = 0; tlsk->pldlen = CPL_TLS_DATA_LENGTH_G(ntohl(hdr->length_pkd)); __skb_queue_tail(&tlsk->sk_recv_queue, skb); } static int chtls_rx_pdu(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_tls_data *req = cplhdr(skb); unsigned int hwtid = GET_TID(req); struct sock *sk; sk = lookup_tid(cdev->tids, hwtid); if (unlikely(!sk)) { pr_err("can't find conn. for hwtid %u.\n", hwtid); return -EINVAL; } skb_dst_set(skb, NULL); process_cpl_msg(chtls_recv_pdu, sk, skb); return 0; } static void chtls_set_hdrlen(struct sk_buff *skb, unsigned int nlen) { struct tlsrx_cmp_hdr *tls_cmp_hdr = cplhdr(skb); skb->hdr_len = ntohs((__force __be16)tls_cmp_hdr->length); tls_cmp_hdr->length = ntohs((__force __be16)nlen); } static void chtls_rx_hdr(struct sock *sk, struct sk_buff *skb) { struct tlsrx_cmp_hdr *tls_hdr_pkt; struct cpl_rx_tls_cmp *cmp_cpl; struct sk_buff *skb_rec; struct chtls_sock *csk; struct chtls_hws *tlsk; struct tcp_sock *tp; cmp_cpl = cplhdr(skb); csk = rcu_dereference_sk_user_data(sk); tlsk = &csk->tlshws; tp = tcp_sk(sk); ULP_SKB_CB(skb)->seq = ntohl(cmp_cpl->seq); ULP_SKB_CB(skb)->flags = 0; skb_reset_transport_header(skb); __skb_pull(skb, sizeof(*cmp_cpl)); tls_hdr_pkt = (struct tlsrx_cmp_hdr *)skb->data; if (tls_hdr_pkt->res_to_mac_error & TLSRX_HDR_PKT_ERROR_M) tls_hdr_pkt->type = CONTENT_TYPE_ERROR; if (!skb->data_len) __skb_trim(skb, TLS_HEADER_LENGTH); tp->rcv_nxt += CPL_RX_TLS_CMP_PDULENGTH_G(ntohl(cmp_cpl->pdulength_length)); ULP_SKB_CB(skb)->flags |= ULPCB_FLAG_TLS_HDR; skb_rec = __skb_dequeue(&tlsk->sk_recv_queue); if (!skb_rec) { __skb_queue_tail(&sk->sk_receive_queue, skb); } else { chtls_set_hdrlen(skb, tlsk->pldlen); tlsk->pldlen = 0; __skb_queue_tail(&sk->sk_receive_queue, skb); __skb_queue_tail(&sk->sk_receive_queue, skb_rec); } if (!sock_flag(sk, SOCK_DEAD)) { check_sk_callbacks(csk); sk->sk_data_ready(sk); } } static int chtls_rx_cmp(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_rx_tls_cmp *req = cplhdr(skb); unsigned int hwtid = GET_TID(req); struct sock *sk; sk = lookup_tid(cdev->tids, hwtid); if (unlikely(!sk)) { pr_err("can't find conn. for hwtid %u.\n", hwtid); return -EINVAL; } skb_dst_set(skb, NULL); process_cpl_msg(chtls_rx_hdr, sk, skb); return 0; } static void chtls_timewait(struct sock *sk) { struct tcp_sock *tp = tcp_sk(sk); tp->rcv_nxt++; tp->rx_opt.ts_recent_stamp = ktime_get_seconds(); tp->srtt_us = 0; tcp_time_wait(sk, TCP_TIME_WAIT, 0); } static void chtls_peer_close(struct sock *sk, struct sk_buff *skb) { struct chtls_sock *csk = rcu_dereference_sk_user_data(sk); sk->sk_shutdown |= RCV_SHUTDOWN; sock_set_flag(sk, SOCK_DONE); switch (sk->sk_state) { case TCP_SYN_RECV: case TCP_ESTABLISHED: tcp_set_state(sk, TCP_CLOSE_WAIT); break; case TCP_FIN_WAIT1: tcp_set_state(sk, TCP_CLOSING); break; case TCP_FIN_WAIT2: chtls_release_resources(sk); if (csk_flag_nochk(csk, CSK_ABORT_RPL_PENDING)) chtls_conn_done(sk); else chtls_timewait(sk); break; default: pr_info("cpl_peer_close in bad state %d\n", sk->sk_state); } if (!sock_flag(sk, SOCK_DEAD)) { sk->sk_state_change(sk); /* Do not send POLL_HUP for half duplex close. */ if ((sk->sk_shutdown & SEND_SHUTDOWN) || sk->sk_state == TCP_CLOSE) sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_HUP); else sk_wake_async(sk, SOCK_WAKE_WAITD, POLL_IN); } } static void chtls_close_con_rpl(struct sock *sk, struct sk_buff *skb) { struct cpl_close_con_rpl *rpl = cplhdr(skb) + RSS_HDR; struct chtls_sock *csk; struct tcp_sock *tp; csk = rcu_dereference_sk_user_data(sk); tp = tcp_sk(sk); tp->snd_una = ntohl(rpl->snd_nxt) - 1; /* exclude FIN */ switch (sk->sk_state) { case TCP_CLOSING: chtls_release_resources(sk); if (csk_flag_nochk(csk, CSK_ABORT_RPL_PENDING)) chtls_conn_done(sk); else chtls_timewait(sk); break; case TCP_LAST_ACK: chtls_release_resources(sk); chtls_conn_done(sk); break; case TCP_FIN_WAIT1: tcp_set_state(sk, TCP_FIN_WAIT2); sk->sk_shutdown |= SEND_SHUTDOWN; if (!sock_flag(sk, SOCK_DEAD)) sk->sk_state_change(sk); else if (tcp_sk(sk)->linger2 < 0 && !csk_flag_nochk(csk, CSK_ABORT_SHUTDOWN)) chtls_abort_conn(sk, skb); break; default: pr_info("close_con_rpl in bad state %d\n", sk->sk_state); } kfree_skb(skb); } static struct sk_buff *get_cpl_skb(struct sk_buff *skb, size_t len, gfp_t gfp) { if (likely(!skb_is_nonlinear(skb) && !skb_cloned(skb))) { WARN_ONCE(skb->len < len, "skb alloc error"); __skb_trim(skb, len); skb_get(skb); } else { skb = alloc_skb(len, gfp); if (skb) __skb_put(skb, len); } return skb; } static void set_abort_rpl_wr(struct sk_buff *skb, unsigned int tid, int cmd) { struct cpl_abort_rpl *rpl = cplhdr(skb); INIT_TP_WR_CPL(rpl, CPL_ABORT_RPL, tid); rpl->cmd = cmd; } static void send_defer_abort_rpl(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_abort_req_rss *req = cplhdr(skb); struct sk_buff *reply_skb; reply_skb = alloc_skb(sizeof(struct cpl_abort_rpl), GFP_KERNEL | __GFP_NOFAIL); __skb_put(reply_skb, sizeof(struct cpl_abort_rpl)); set_abort_rpl_wr(reply_skb, GET_TID(req), (req->status & CPL_ABORT_NO_RST)); set_wr_txq(reply_skb, CPL_PRIORITY_DATA, req->status >> 1); cxgb4_ofld_send(cdev->lldi->ports[0], reply_skb); kfree_skb(skb); } static void send_abort_rpl(struct sock *sk, struct sk_buff *skb, struct chtls_dev *cdev, int status, int queue) { struct cpl_abort_req_rss *req = cplhdr(skb); struct sk_buff *reply_skb; struct chtls_sock *csk; csk = rcu_dereference_sk_user_data(sk); reply_skb = alloc_skb(sizeof(struct cpl_abort_rpl), GFP_KERNEL); if (!reply_skb) { req->status = (queue << 1); send_defer_abort_rpl(cdev, skb); return; } set_abort_rpl_wr(reply_skb, GET_TID(req), status); kfree_skb(skb); set_wr_txq(reply_skb, CPL_PRIORITY_DATA, queue); if (csk_conn_inline(csk)) { struct l2t_entry *e = csk->l2t_entry; if (e && sk->sk_state != TCP_SYN_RECV) { cxgb4_l2t_send(csk->egress_dev, reply_skb, e); return; } } cxgb4_ofld_send(cdev->lldi->ports[0], reply_skb); } /* * Add an skb to the deferred skb queue for processing from process context. */ static void t4_defer_reply(struct sk_buff *skb, struct chtls_dev *cdev, defer_handler_t handler) { DEFERRED_SKB_CB(skb)->handler = handler; spin_lock_bh(&cdev->deferq.lock); __skb_queue_tail(&cdev->deferq, skb); if (skb_queue_len(&cdev->deferq) == 1) schedule_work(&cdev->deferq_task); spin_unlock_bh(&cdev->deferq.lock); } static void chtls_send_abort_rpl(struct sock *sk, struct sk_buff *skb, struct chtls_dev *cdev, int status, int queue) { struct cpl_abort_req_rss *req = cplhdr(skb) + RSS_HDR; struct sk_buff *reply_skb; struct chtls_sock *csk; unsigned int tid; csk = rcu_dereference_sk_user_data(sk); tid = GET_TID(req); reply_skb = get_cpl_skb(skb, sizeof(struct cpl_abort_rpl), gfp_any()); if (!reply_skb) { req->status = (queue << 1) | status; t4_defer_reply(skb, cdev, send_defer_abort_rpl); return; } set_abort_rpl_wr(reply_skb, tid, status); set_wr_txq(reply_skb, CPL_PRIORITY_DATA, queue); if (csk_conn_inline(csk)) { struct l2t_entry *e = csk->l2t_entry; if (e && sk->sk_state != TCP_SYN_RECV) { cxgb4_l2t_send(csk->egress_dev, reply_skb, e); return; } } cxgb4_ofld_send(cdev->lldi->ports[0], reply_skb); kfree_skb(skb); } /* * This is run from a listener's backlog to abort a child connection in * SYN_RCV state (i.e., one on the listener's SYN queue). */ static void bl_abort_syn_rcv(struct sock *lsk, struct sk_buff *skb) { struct chtls_sock *csk; struct sock *child; int queue; child = skb->sk; csk = rcu_dereference_sk_user_data(child); queue = csk->txq_idx; skb->sk = NULL; do_abort_syn_rcv(child, lsk); send_abort_rpl(child, skb, BLOG_SKB_CB(skb)->cdev, CPL_ABORT_NO_RST, queue); } static int abort_syn_rcv(struct sock *sk, struct sk_buff *skb) { const struct request_sock *oreq; struct listen_ctx *listen_ctx; struct chtls_sock *csk; struct chtls_dev *cdev; struct sock *psk; void *ctx; csk = sk->sk_user_data; oreq = csk->passive_reap_next; cdev = csk->cdev; if (!oreq) return -1; ctx = lookup_stid(cdev->tids, oreq->ts_recent); if (!ctx) return -1; listen_ctx = (struct listen_ctx *)ctx; psk = listen_ctx->lsk; bh_lock_sock(psk); if (!sock_owned_by_user(psk)) { int queue = csk->txq_idx; do_abort_syn_rcv(sk, psk); send_abort_rpl(sk, skb, cdev, CPL_ABORT_NO_RST, queue); } else { skb->sk = sk; BLOG_SKB_CB(skb)->backlog_rcv = bl_abort_syn_rcv; __sk_add_backlog(psk, skb); } bh_unlock_sock(psk); return 0; } static void chtls_abort_req_rss(struct sock *sk, struct sk_buff *skb) { const struct cpl_abort_req_rss *req = cplhdr(skb) + RSS_HDR; struct chtls_sock *csk = sk->sk_user_data; int rst_status = CPL_ABORT_NO_RST; int queue = csk->txq_idx; if (is_neg_adv(req->status)) { if (sk->sk_state == TCP_SYN_RECV) chtls_set_tcb_tflag(sk, 0, 0); kfree_skb(skb); return; } csk_reset_flag(csk, CSK_ABORT_REQ_RCVD); if (!csk_flag_nochk(csk, CSK_ABORT_SHUTDOWN) && !csk_flag_nochk(csk, CSK_TX_DATA_SENT)) { struct tcp_sock *tp = tcp_sk(sk); if (send_tx_flowc_wr(sk, 0, tp->snd_nxt, tp->rcv_nxt) < 0) WARN_ONCE(1, "send_tx_flowc error"); csk_set_flag(csk, CSK_TX_DATA_SENT); } csk_set_flag(csk, CSK_ABORT_SHUTDOWN); if (!csk_flag_nochk(csk, CSK_ABORT_RPL_PENDING)) { sk->sk_err = ETIMEDOUT; if (!sock_flag(sk, SOCK_DEAD)) sk->sk_error_report(sk); if (sk->sk_state == TCP_SYN_RECV && !abort_syn_rcv(sk, skb)) return; chtls_release_resources(sk); chtls_conn_done(sk); } chtls_send_abort_rpl(sk, skb, csk->cdev, rst_status, queue); } static void chtls_abort_rpl_rss(struct sock *sk, struct sk_buff *skb) { struct cpl_abort_rpl_rss *rpl = cplhdr(skb) + RSS_HDR; struct chtls_sock *csk; struct chtls_dev *cdev; csk = rcu_dereference_sk_user_data(sk); cdev = csk->cdev; if (csk_flag_nochk(csk, CSK_ABORT_RPL_PENDING)) { csk_reset_flag(csk, CSK_ABORT_RPL_PENDING); if (!csk_flag_nochk(csk, CSK_ABORT_REQ_RCVD)) { if (sk->sk_state == TCP_SYN_SENT) { cxgb4_remove_tid(cdev->tids, csk->port_id, GET_TID(rpl), sk->sk_family); sock_put(sk); } chtls_release_resources(sk); chtls_conn_done(sk); } } kfree_skb(skb); } static int chtls_conn_cpl(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_peer_close *req = cplhdr(skb) + RSS_HDR; void (*fn)(struct sock *sk, struct sk_buff *skb); unsigned int hwtid = GET_TID(req); struct sock *sk; u8 opcode; opcode = ((const struct rss_header *)cplhdr(skb))->opcode; sk = lookup_tid(cdev->tids, hwtid); if (!sk) goto rel_skb; switch (opcode) { case CPL_PEER_CLOSE: fn = chtls_peer_close; break; case CPL_CLOSE_CON_RPL: fn = chtls_close_con_rpl; break; case CPL_ABORT_REQ_RSS: fn = chtls_abort_req_rss; break; case CPL_ABORT_RPL_RSS: fn = chtls_abort_rpl_rss; break; default: goto rel_skb; } process_cpl_msg(fn, sk, skb); return 0; rel_skb: kfree_skb(skb); return 0; } static struct sk_buff *dequeue_wr(struct sock *sk) { struct chtls_sock *csk = rcu_dereference_sk_user_data(sk); struct sk_buff *skb = csk->wr_skb_head; if (likely(skb)) { /* Don't bother clearing the tail */ csk->wr_skb_head = WR_SKB_CB(skb)->next_wr; WR_SKB_CB(skb)->next_wr = NULL; } return skb; } static void chtls_rx_ack(struct sock *sk, struct sk_buff *skb) { struct cpl_fw4_ack *hdr = cplhdr(skb) + RSS_HDR; struct chtls_sock *csk = sk->sk_user_data; struct tcp_sock *tp = tcp_sk(sk); u32 credits = hdr->credits; u32 snd_una; snd_una = ntohl(hdr->snd_una); csk->wr_credits += credits; if (csk->wr_unacked > csk->wr_max_credits - csk->wr_credits) csk->wr_unacked = csk->wr_max_credits - csk->wr_credits; while (credits) { struct sk_buff *pskb = csk->wr_skb_head; u32 csum; if (unlikely(!pskb)) { if (csk->wr_nondata) csk->wr_nondata -= credits; break; } csum = (__force u32)pskb->csum; if (unlikely(credits < csum)) { pskb->csum = (__force __wsum)(csum - credits); break; } dequeue_wr(sk); credits -= csum; kfree_skb(pskb); } if (hdr->seq_vld & CPL_FW4_ACK_FLAGS_SEQVAL) { if (unlikely(before(snd_una, tp->snd_una))) { kfree_skb(skb); return; } if (tp->snd_una != snd_una) { tp->snd_una = snd_una; tp->rcv_tstamp = tcp_time_stamp(tp); if (tp->snd_una == tp->snd_nxt && !csk_flag_nochk(csk, CSK_TX_FAILOVER)) csk_reset_flag(csk, CSK_TX_WAIT_IDLE); } } if (hdr->seq_vld & CPL_FW4_ACK_FLAGS_CH) { unsigned int fclen16 = roundup(failover_flowc_wr_len, 16); csk->wr_credits -= fclen16; csk_reset_flag(csk, CSK_TX_WAIT_IDLE); csk_reset_flag(csk, CSK_TX_FAILOVER); } if (skb_queue_len(&csk->txq) && chtls_push_frames(csk, 0)) sk->sk_write_space(sk); kfree_skb(skb); } static int chtls_wr_ack(struct chtls_dev *cdev, struct sk_buff *skb) { struct cpl_fw4_ack *rpl = cplhdr(skb) + RSS_HDR; unsigned int hwtid = GET_TID(rpl); struct sock *sk; sk = lookup_tid(cdev->tids, hwtid); if (unlikely(!sk)) { pr_err("can't find conn. for hwtid %u.\n", hwtid); return -EINVAL; } process_cpl_msg(chtls_rx_ack, sk, skb); return 0; } chtls_handler_func chtls_handlers[NUM_CPL_CMDS] = { [CPL_PASS_OPEN_RPL] = chtls_pass_open_rpl, [CPL_CLOSE_LISTSRV_RPL] = chtls_close_listsrv_rpl, [CPL_PASS_ACCEPT_REQ] = chtls_pass_accept_req, [CPL_PASS_ESTABLISH] = chtls_pass_establish, [CPL_RX_DATA] = chtls_rx_data, [CPL_TLS_DATA] = chtls_rx_pdu, [CPL_RX_TLS_CMP] = chtls_rx_cmp, [CPL_PEER_CLOSE] = chtls_conn_cpl, [CPL_CLOSE_CON_RPL] = chtls_conn_cpl, [CPL_ABORT_REQ_RSS] = chtls_conn_cpl, [CPL_ABORT_RPL_RSS] = chtls_conn_cpl, [CPL_FW4_ACK] = chtls_wr_ack, };
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