[DCCP]: Remove duplicate code for Reset from connected socket
In this patch, duplicated code is removed for the case when a Reset packet is sent from a connected socket. This code duplication is between dccp_make_reset and dccp_transmit_skb, which already contained an (up to now entirely unused) switch statement to fill in the reset code from the DCCP_SKB_CB. The only thing that has been removed is the call to dst_clone(dst), since the queue_xmit functions use sk_dst_cache anyway. I wasn't sure which purpose inet_sk_rebuild_header served, so I left it in. Signed-off-by: Gerrit Renker <gerrit@erg.abdn.ac.uk> Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
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@ -61,6 +61,7 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
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set_ack = 0;
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/* fall through */
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case DCCP_PKT_DATAACK:
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case DCCP_PKT_RESET:
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break;
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case DCCP_PKT_REQUEST:
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@ -73,8 +74,10 @@ static int dccp_transmit_skb(struct sock *sk, struct sk_buff *skb)
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/* fall through */
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default:
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/*
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* Only data packets should come through with skb->sk
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* set.
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* Set owner/destructor: some skbs are allocated via
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* alloc_skb (e.g. when retransmission may happen).
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* Only Data, DataAck, and Reset packets should come
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* through here with skb->sk set.
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*/
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WARN_ON(skb->sk);
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skb_set_owner_w(skb, sk);
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@ -324,72 +327,29 @@ struct sk_buff *dccp_make_response(struct sock *sk, struct dst_entry *dst,
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EXPORT_SYMBOL_GPL(dccp_make_response);
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static struct sk_buff *dccp_make_reset(struct sock *sk, struct dst_entry *dst,
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const enum dccp_reset_codes code)
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{
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struct dccp_hdr *dh;
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struct dccp_sock *dp = dccp_sk(sk);
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const u32 dccp_header_size = sizeof(struct dccp_hdr) +
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sizeof(struct dccp_hdr_ext) +
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sizeof(struct dccp_hdr_reset);
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struct sk_buff *skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1,
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GFP_ATOMIC);
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if (skb == NULL)
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return NULL;
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/* Reserve space for headers. */
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skb_reserve(skb, sk->sk_prot->max_header);
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skb->dst = dst_clone(dst);
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dccp_inc_seqno(&dp->dccps_gss);
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DCCP_SKB_CB(skb)->dccpd_reset_code = code;
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DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESET;
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DCCP_SKB_CB(skb)->dccpd_seq = dp->dccps_gss;
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if (dccp_insert_options(sk, skb)) {
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kfree_skb(skb);
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return NULL;
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}
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dh = dccp_zeroed_hdr(skb, dccp_header_size);
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dh->dccph_sport = inet_sk(sk)->sport;
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dh->dccph_dport = inet_sk(sk)->dport;
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dh->dccph_doff = (dccp_header_size +
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DCCP_SKB_CB(skb)->dccpd_opt_len) / 4;
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dh->dccph_type = DCCP_PKT_RESET;
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dh->dccph_x = 1;
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dccp_hdr_set_seq(dh, dp->dccps_gss);
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dccp_hdr_set_ack(dccp_hdr_ack_bits(skb), dp->dccps_gsr);
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dccp_hdr_reset(skb)->dccph_reset_code = code;
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inet_csk(sk)->icsk_af_ops->send_check(sk, 0, skb);
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DCCP_INC_STATS(DCCP_MIB_OUTSEGS);
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return skb;
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}
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/* send Reset on established socket, to close or abort the connection */
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int dccp_send_reset(struct sock *sk, enum dccp_reset_codes code)
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{
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struct sk_buff *skb;
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/*
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* FIXME: what if rebuild_header fails?
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* Should we be doing a rebuild_header here?
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*/
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int err = inet_sk_rebuild_header(sk);
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if (err == 0) {
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struct sk_buff *skb = dccp_make_reset(sk, sk->sk_dst_cache,
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code);
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if (skb != NULL) {
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memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));
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err = inet_csk(sk)->icsk_af_ops->queue_xmit(skb, 0);
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return net_xmit_eval(err);
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}
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}
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if (err != 0)
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return err;
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return err;
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skb = sock_wmalloc(sk, sk->sk_prot->max_header, 1, GFP_ATOMIC);
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if (skb == NULL)
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return -ENOBUFS;
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/* Reserve space for headers and prepare control bits. */
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skb_reserve(skb, sk->sk_prot->max_header);
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DCCP_SKB_CB(skb)->dccpd_type = DCCP_PKT_RESET;
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DCCP_SKB_CB(skb)->dccpd_reset_code = code;
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return dccp_transmit_skb(sk, skb);
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}
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/*
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