diff options
Diffstat (limited to 'net/dccp')
| -rw-r--r-- | net/dccp/ipv4.c | 266 |
1 files changed, 132 insertions, 134 deletions
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c index 8dd9f5a..ed62026 100644 --- a/net/dccp/ipv4.c +++ b/net/dccp/ipv4.c @@ -193,37 +193,6 @@ static inline void dccp_do_pmtu_discovery(struct sock *sk, } /* else let the usual retransmit timer handle it */ } -static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, - struct dst_entry *dst) -{ - int err = -1; - struct sk_buff *skb; - - /* First, grab a route. */ - - if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) - goto out; - - skb = dccp_make_response(sk, dst, req); - if (skb != NULL) { - const struct inet_request_sock *ireq = inet_rsk(req); - struct dccp_hdr *dh = dccp_hdr(skb); - - dh->dccph_checksum = dccp_v4_checksum(skb, ireq->loc_addr, - ireq->rmt_addr); - memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); - err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, - ireq->rmt_addr, - ireq->opt); - if (err == NET_XMIT_CN) - err = 0; - } - -out: - dst_release(dst); - return err; -} - /* * This routine is called by the ICMP module when it gets some sort of error * condition. If err < 0 then the socket should be closed and the error @@ -400,95 +369,6 @@ static inline u64 dccp_v4_init_sequence(const struct sock *sk, dccp_hdr(skb)->dccph_sport); } -static struct request_sock_ops dccp_request_sock_ops; - -int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) -{ - struct inet_request_sock *ireq; - struct dccp_sock dp; - struct request_sock *req; - struct dccp_request_sock *dreq; - const __be32 saddr = skb->nh.iph->saddr; - const __be32 daddr = skb->nh.iph->daddr; - const __be32 service = dccp_hdr_request(skb)->dccph_req_service; - struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); - __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; - - /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ - if (((struct rtable *)skb->dst)->rt_flags & - (RTCF_BROADCAST | RTCF_MULTICAST)) { - reset_code = DCCP_RESET_CODE_NO_CONNECTION; - goto drop; - } - - if (dccp_bad_service_code(sk, service)) { - reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; - goto drop; - } - /* - * TW buckets are converted to open requests without - * limitations, they conserve resources and peer is - * evidently real one. - */ - if (inet_csk_reqsk_queue_is_full(sk)) - goto drop; - - /* - * Accept backlog is full. If we have already queued enough - * of warm entries in syn queue, drop request. It is better than - * clogging syn queue with openreqs with exponentially increasing - * timeout. - */ - if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) - goto drop; - - req = reqsk_alloc(&dccp_request_sock_ops); - if (req == NULL) - goto drop; - - if (dccp_parse_options(sk, skb)) - goto drop_and_free; - - dccp_openreq_init(req, &dp, skb); - - if (security_inet_conn_request(sk, skb, req)) - goto drop_and_free; - - ireq = inet_rsk(req); - ireq->loc_addr = daddr; - ireq->rmt_addr = saddr; - req->rcv_wnd = dccp_feat_default_sequence_window; - ireq->opt = NULL; - - /* - * Step 3: Process LISTEN state - * - * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie - * - * In fact we defer setting S.GSR, S.SWL, S.SWH to - * dccp_create_openreq_child. - */ - dreq = dccp_rsk(req); - dreq->dreq_isr = dcb->dccpd_seq; - dreq->dreq_iss = dccp_v4_init_sequence(sk, skb); - dreq->dreq_service = service; - - if (dccp_v4_send_response(sk, req, NULL)) - goto drop_and_free; - - inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); - return 0; - -drop_and_free: - reqsk_free(req); -drop: - DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); - dcb->dccpd_reset_code = reset_code; - return -1; -} - -EXPORT_SYMBOL_GPL(dccp_v4_conn_request); - /* * The three way handshake has completed - we got a valid ACK or DATAACK - * now create the new socket. @@ -640,6 +520,37 @@ static struct dst_entry* dccp_v4_route_skb(struct sock *sk, return &rt->u.dst; } +static int dccp_v4_send_response(struct sock *sk, struct request_sock *req, + struct dst_entry *dst) +{ + int err = -1; + struct sk_buff *skb; + + /* First, grab a route. */ + + if (dst == NULL && (dst = inet_csk_route_req(sk, req)) == NULL) + goto out; + + skb = dccp_make_response(sk, dst, req); + if (skb != NULL) { + const struct inet_request_sock *ireq = inet_rsk(req); + struct dccp_hdr *dh = dccp_hdr(skb); + + dh->dccph_checksum = dccp_v4_checksum(skb, ireq->loc_addr, + ireq->rmt_addr); + memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt)); + err = ip_build_and_send_pkt(skb, sk, ireq->loc_addr, + ireq->rmt_addr, + ireq->opt); + if (err == NET_XMIT_CN) + err = 0; + } + +out: + dst_release(dst); + return err; +} + static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb) { int err; @@ -708,6 +619,107 @@ out: dst_release(dst); } +static void dccp_v4_reqsk_destructor(struct request_sock *req) +{ + kfree(inet_rsk(req)->opt); +} + +static struct request_sock_ops dccp_request_sock_ops __read_mostly = { + .family = PF_INET, + .obj_size = sizeof(struct dccp_request_sock), + .rtx_syn_ack = dccp_v4_send_response, + .send_ack = dccp_reqsk_send_ack, + .destructor = dccp_v4_reqsk_destructor, + .send_reset = dccp_v4_ctl_send_reset, +}; + +int dccp_v4_conn_request(struct sock *sk, struct sk_buff *skb) +{ + struct inet_request_sock *ireq; + struct dccp_sock dp; + struct request_sock *req; + struct dccp_request_sock *dreq; + const __be32 saddr = skb->nh.iph->saddr; + const __be32 daddr = skb->nh.iph->daddr; + const __be32 service = dccp_hdr_request(skb)->dccph_req_service; + struct dccp_skb_cb *dcb = DCCP_SKB_CB(skb); + __u8 reset_code = DCCP_RESET_CODE_TOO_BUSY; + + /* Never answer to DCCP_PKT_REQUESTs send to broadcast or multicast */ + if (((struct rtable *)skb->dst)->rt_flags & + (RTCF_BROADCAST | RTCF_MULTICAST)) { + reset_code = DCCP_RESET_CODE_NO_CONNECTION; + goto drop; + } + + if (dccp_bad_service_code(sk, service)) { + reset_code = DCCP_RESET_CODE_BAD_SERVICE_CODE; + goto drop; + } + /* + * TW buckets are converted to open requests without + * limitations, they conserve resources and peer is + * evidently real one. + */ + if (inet_csk_reqsk_queue_is_full(sk)) + goto drop; + + /* + * Accept backlog is full. If we have already queued enough + * of warm entries in syn queue, drop request. It is better than + * clogging syn queue with openreqs with exponentially increasing + * timeout. + */ + if (sk_acceptq_is_full(sk) && inet_csk_reqsk_queue_young(sk) > 1) + goto drop; + + req = reqsk_alloc(&dccp_request_sock_ops); + if (req == NULL) + goto drop; + + if (dccp_parse_options(sk, skb)) + goto drop_and_free; + + dccp_openreq_init(req, &dp, skb); + + if (security_inet_conn_request(sk, skb, req)) + goto drop_and_free; + + ireq = inet_rsk(req); + ireq->loc_addr = daddr; + ireq->rmt_addr = saddr; + req->rcv_wnd = dccp_feat_default_sequence_window; + ireq->opt = NULL; + + /* + * Step 3: Process LISTEN state + * + * Set S.ISR, S.GSR, S.SWL, S.SWH from packet or Init Cookie + * + * In fact we defer setting S.GSR, S.SWL, S.SWH to + * dccp_create_openreq_child. + */ + dreq = dccp_rsk(req); + dreq->dreq_isr = dcb->dccpd_seq; + dreq->dreq_iss = dccp_v4_init_sequence(sk, skb); + dreq->dreq_service = service; + + if (dccp_v4_send_response(sk, req, NULL)) + goto drop_and_free; + + inet_csk_reqsk_queue_hash_add(sk, req, DCCP_TIMEOUT_INIT); + return 0; + +drop_and_free: + reqsk_free(req); +drop: + DCCP_INC_STATS_BH(DCCP_MIB_ATTEMPTFAILS); + dcb->dccpd_reset_code = reset_code; + return -1; +} + +EXPORT_SYMBOL_GPL(dccp_v4_conn_request); + int dccp_v4_do_rcv(struct sock *sk, struct sk_buff *skb) { struct dccp_hdr *dh = dccp_hdr(skb); @@ -959,20 +971,6 @@ static int dccp_v4_init_sock(struct sock *sk) return err; } -static void dccp_v4_reqsk_destructor(struct request_sock *req) -{ - kfree(inet_rsk(req)->opt); -} - -static struct request_sock_ops dccp_request_sock_ops __read_mostly = { - .family = PF_INET, - .obj_size = sizeof(struct dccp_request_sock), - .rtx_syn_ack = dccp_v4_send_response, - .send_ack = dccp_reqsk_send_ack, - .destructor = dccp_v4_reqsk_destructor, - .send_reset = dccp_v4_ctl_send_reset, -}; - static struct timewait_sock_ops dccp_timewait_sock_ops = { .twsk_obj_size = sizeof(struct inet_timewait_sock), }; |