/** * llc_conn_state_process - sends event to connection state machine * @sk: connection * @skb: occurred event * * Sends an event to connection state machine. After processing event * (executing it's actions and changing state), upper layer will be * indicated or confirmed, if needed. Returns 0 for success, 1 for * failure. The socket lock has to be held before calling this function. */ int llc_conn_state_process(struct sock *sk, struct sk_buff *skb) { int rc; struct llc_sock *llc = llc_sk(skb->sk); struct llc_conn_state_ev *ev = llc_conn_ev(skb); /* * We have to hold the skb, because llc_conn_service will kfree it in * the sending path and we need to look at the skb->cb, where we encode * llc_conn_state_ev. */ skb_get(skb); ev->ind_prim = ev->cfm_prim = 0; /* * Send event to state machine */ rc = llc_conn_service(skb->sk, skb); if (unlikely(rc != 0)) { ; goto out_kfree_skb; } if (unlikely(!ev->ind_prim && !ev->cfm_prim)) { /* indicate or confirm not required */ if (!skb->next) goto out_kfree_skb; goto out_skb_put; } if (unlikely(ev->ind_prim && ev->cfm_prim)) /* Paranoia */ skb_get(skb); switch (ev->ind_prim) { case LLC_DATA_PRIM: llc_save_primitive(sk, skb, LLC_DATA_PRIM); if (unlikely(sock_queue_rcv_skb(sk, skb))) { /* * shouldn't happen */ // printk(KERN_ERR "%s: sock_queue_rcv_skb failed!\n", ; kfree_skb(skb); } break; case LLC_CONN_PRIM: /* * Can't be sock_queue_rcv_skb, because we have to leave the * skb->sk pointing to the newly created struct sock in * llc_conn_handler. -acme */ skb_queue_tail(&sk->sk_receive_queue, skb); sk->sk_state_change(sk); break; case LLC_DISC_PRIM: sock_hold(sk); if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_ESTABLISHED) { sk->sk_shutdown = SHUTDOWN_MASK; sk->sk_socket->state = SS_UNCONNECTED; sk->sk_state = TCP_CLOSE; if (!sock_flag(sk, SOCK_DEAD)) { sock_set_flag(sk, SOCK_DEAD); sk->sk_state_change(sk); } } kfree_skb(skb); sock_put(sk); break; case LLC_RESET_PRIM: /* * FIXME: * RESET is not being notified to upper layers for now */ ; kfree_skb(skb); break; default: if (ev->ind_prim) { // printk(KERN_INFO "%s: received unknown %d prim!\n", ; kfree_skb(skb); } /* No indication */ break; } switch (ev->cfm_prim) { case LLC_DATA_PRIM: if (!llc_data_accept_state(llc->state)) sk->sk_write_space(sk); else rc = llc->failed_data_req = 1; break; case LLC_CONN_PRIM: if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_SYN_SENT) { if (ev->status) { sk->sk_socket->state = SS_UNCONNECTED; sk->sk_state = TCP_CLOSE; } else { sk->sk_socket->state = SS_CONNECTED; sk->sk_state = TCP_ESTABLISHED; } sk->sk_state_change(sk); } break; case LLC_DISC_PRIM: sock_hold(sk); if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSING) { sk->sk_socket->state = SS_UNCONNECTED; sk->sk_state = TCP_CLOSE; sk->sk_state_change(sk); } sock_put(sk); break; case LLC_RESET_PRIM: /* * FIXME: * RESET is not being notified to upper layers for now */ ; break; default: if (ev->cfm_prim) { // printk(KERN_INFO "%s: received unknown %d prim!\n", ; break; } goto out_skb_put; /* No confirmation */ } out_kfree_skb: kfree_skb(skb); out_skb_put: kfree_skb(skb); return rc; }
int llc_conn_state_process(struct sock *sk, struct sk_buff *skb) { int rc; struct llc_sock *llc = llc_sk(skb->sk); struct llc_conn_state_ev *ev = llc_conn_ev(skb); skb_get(skb); ev->ind_prim = ev->cfm_prim = 0; rc = llc_conn_service(skb->sk, skb); if (unlikely(rc != 0)) { printk(KERN_ERR "%s: llc_conn_service failed\n", __func__); goto out_kfree_skb; } if (unlikely(!ev->ind_prim && !ev->cfm_prim)) { if (!skb->next) goto out_kfree_skb; goto out_skb_put; } if (unlikely(ev->ind_prim && ev->cfm_prim)) skb_get(skb); switch (ev->ind_prim) { case LLC_DATA_PRIM: llc_save_primitive(sk, skb, LLC_DATA_PRIM); if (unlikely(sock_queue_rcv_skb(sk, skb))) { printk(KERN_ERR "%s: sock_queue_rcv_skb failed!\n", __func__); kfree_skb(skb); } break; case LLC_CONN_PRIM: skb_queue_tail(&sk->sk_receive_queue, skb); sk->sk_state_change(sk); break; case LLC_DISC_PRIM: sock_hold(sk); if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_ESTABLISHED) { sk->sk_shutdown = SHUTDOWN_MASK; sk->sk_socket->state = SS_UNCONNECTED; sk->sk_state = TCP_CLOSE; if (!sock_flag(sk, SOCK_DEAD)) { sock_set_flag(sk, SOCK_DEAD); sk->sk_state_change(sk); } } kfree_skb(skb); sock_put(sk); break; case LLC_RESET_PRIM: printk(KERN_INFO "%s: received a reset ind!\n", __func__); kfree_skb(skb); break; default: if (ev->ind_prim) { printk(KERN_INFO "%s: received unknown %d prim!\n", __func__, ev->ind_prim); kfree_skb(skb); } break; } switch (ev->cfm_prim) { case LLC_DATA_PRIM: if (!llc_data_accept_state(llc->state)) sk->sk_write_space(sk); else rc = llc->failed_data_req = 1; break; case LLC_CONN_PRIM: if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_SYN_SENT) { if (ev->status) { sk->sk_socket->state = SS_UNCONNECTED; sk->sk_state = TCP_CLOSE; } else { sk->sk_socket->state = SS_CONNECTED; sk->sk_state = TCP_ESTABLISHED; } sk->sk_state_change(sk); } break; case LLC_DISC_PRIM: sock_hold(sk); if (sk->sk_type == SOCK_STREAM && sk->sk_state == TCP_CLOSING) { sk->sk_socket->state = SS_UNCONNECTED; sk->sk_state = TCP_CLOSE; sk->sk_state_change(sk); } sock_put(sk); break; case LLC_RESET_PRIM: printk(KERN_INFO "%s: received a reset conf!\n", __func__); break; default: if (ev->cfm_prim) { printk(KERN_INFO "%s: received unknown %d prim!\n", __func__, ev->cfm_prim); break; } goto out_skb_put; } out_kfree_skb: kfree_skb(skb); out_skb_put: kfree_skb(skb); return rc; }