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yaml
---
r: 41621
b: refs/heads/master
c: 3d2fe62
h: refs/heads/master
i:
  41619: 1144648
v: v3
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Gerrit Renker authored and David S. Miller committed Dec 3, 2006
1 parent 3d76656 commit b3e694d
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Showing 2 changed files with 133 additions and 135 deletions.
2 changes: 1 addition & 1 deletion [refs]
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Original file line number Diff line number Diff line change
@@ -1,2 +1,2 @@
---
refs/heads/master: 8a73cd09d96aa01743316657fc4e6864fe79b703
refs/heads/master: 3d2fe62b8d8522722c4fe46b8af13520b73848c4
266 changes: 132 additions & 134 deletions trunk/net/dccp/ipv4.c
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Original file line number Diff line number Diff line change
Expand Up @@ -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
Expand Down Expand Up @@ -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.
Expand Down Expand Up @@ -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;
Expand Down Expand Up @@ -708,6 +619,107 @@ static void dccp_v4_ctl_send_reset(struct sk_buff *rxskb)
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);
Expand Down Expand Up @@ -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),
};
Expand Down

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