/* Add an association to an endpoint. */ void sctp_endpoint_add_asoc(struct sctp_endpoint *ep, struct sctp_association *asoc) { struct sock *sk = ep->base.sk; /* Now just add it to our list of asocs */ list_add_tail(&asoc->asocs, &ep->asocs); /* Increment the backlog value for a TCP-style listening socket. */ if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) sk->sk_ack_backlog++; }
/* Add an association to an endpoint. */ void sctp_endpoint_add_asoc(struct sctp_endpoint *ep, struct sctp_association *asoc) { struct sock *sk = ep->base.sk; /* If this is a temporary association, don't bother * since we'll be removing it shortly and don't * want anyone to find it anyway. */ if (asoc->temp) return; /* Now just add it to our list of asocs */ list_add_tail(&asoc->asocs, &ep->asocs); /* Increment the backlog value for a TCP-style listening socket. */ if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) sk->sk_ack_backlog++; }
void sctp_endpoint_add_asoc(struct sctp_endpoint *ep, struct sctp_association *asoc) { struct sock *sk = ep->base.sk; /* */ if (asoc->temp) return; /* */ list_add_tail(&asoc->asocs, &ep->asocs); /* */ if (sctp_style(sk, TCP) && sctp_sstate(sk, LISTENING)) sk->sk_ack_backlog++; }
/* * Respond to a normal COOKIE ECHO chunk. * We are the side that is being asked for an association. * * Section: 5.1 Normal Establishment of an Association, D * D) Upon reception of the COOKIE ECHO chunk, Endpoint "Z" will reply * with a COOKIE ACK chunk after building a TCB and moving to * the ESTABLISHED state. A COOKIE ACK chunk may be bundled with * any pending DATA chunks (and/or SACK chunks), but the COOKIE ACK * chunk MUST be the first chunk in the packet. * * IMPLEMENTATION NOTE: An implementation may choose to send the * Communication Up notification to the SCTP user upon reception * of a valid COOKIE ECHO chunk. * * Verification Tag: 8.5.1 Exceptions in Verification Tag Rules * D) Rules for packet carrying a COOKIE ECHO * * - When sending a COOKIE ECHO, the endpoint MUST use the value of the * Initial Tag received in the INIT ACK. * * - The receiver of a COOKIE ECHO follows the procedures in Section 5. * * Inputs * (endpoint, asoc, chunk) * * Outputs * (asoc, reply_msg, msg_up, timers, counters) * * The return value is the disposition of the chunk. */ sctp_disposition_t sctp_sf_do_5_1D_ce(struct net *net, const struct sctp_endpoint *ep, const struct sctp_association *asoc, const sctp_subtype_t type, void *arg, sctp_cmd_seq_t *commands) { struct sctp_chunk *chunk = arg; struct sctp_association *new_asoc; sctp_init_chunk_t *peer_init; struct sctp_chunk *repl; struct sctp_ulpevent *ev, *ai_ev = NULL; int error = 0; struct sctp_chunk *err_chk_p; struct sock *sk; /* If the packet is an OOTB packet which is temporarily on the * control endpoint, respond with an ABORT. */ if (ep == sctp_sk(net->sctp.ctl_sock)->ep) { SCTP_INC_STATS(net, SCTP_MIB_OUTOFBLUES); return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); } /* Make sure that the COOKIE_ECHO chunk has a valid length. * In this case, we check that we have enough for at least a * chunk header. More detailed verification is done * in sctp_unpack_cookie(). */ if (!sctp_chunk_length_valid(chunk, sizeof(sctp_chunkhdr_t))) return sctp_sf_pdiscard(net, ep, asoc, type, arg, commands); /* If the endpoint is not listening or if the number of associations * on the TCP-style socket exceed the max backlog, respond with an * ABORT. */ sk = ep->base.sk; if (!sctp_sstate(sk, LISTENING) || (sctp_style(sk, TCP) && sk_acceptq_is_full(sk))) return sctp_sf_tabort_8_4_8(net, ep, asoc, type, arg, commands); /* "Decode" the chunk. We have no optional parameters so we * are in good shape. */ chunk->subh.cookie_hdr = (struct sctp_signed_cookie *)chunk->skb->data; if (!pskb_pull(chunk->skb, ntohs(chunk->chunk_hdr->length) - sizeof(sctp_chunkhdr_t))) goto nomem; /* 5.1 D) Upon reception of the COOKIE ECHO chunk, Endpoint * "Z" will reply with a COOKIE ACK chunk after building a TCB * and moving to the ESTABLISHED state. */ new_asoc = sctp_unpack_cookie(ep, asoc, chunk, GFP_ATOMIC, &error, &err_chk_p); /* FIXME: * If the re-build failed, what is the proper error path * from here? * * [We should abort the association. --piggy] */ if (!new_asoc) { /* FIXME: Several errors are possible. A bad cookie should * be silently discarded, but think about logging it too. */ switch (error) { case -SCTP_IERROR_NOMEM: goto nomem; case -SCTP_IERROR_STALE_COOKIE: sctp_send_stale_cookie_err(net, ep, asoc, chunk, commands, err_chk_p); return sctp_sf_pdisc