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[NET] Generalise TCP's struct open_request minisock infrastructure

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Kept this first changeset minimal, without changing existing names to
ease peer review.

Basicaly tcp_openreq_alloc now receives the or_calltable, that in turn
has two new members:

->slab, that replaces tcp_openreq_cachep
->obj_size, to inform the size of the openreq descendant for
  a specific protocol

The protocol specific fields in struct open_request were moved to a
class hierarchy, with the things that are common to all connection
oriented PF_INET protocols in struct inet_request_sock, the TCP ones
in tcp_request_sock, that is an inet_request_sock, that is an
open_request.

I.e. this uses the same approach used for the struct sock class
hierarchy, with sk_prot indicating if the protocol wants to use the
open_request infrastructure by filling in sk_prot->rsk_prot with an
or_calltable.

Results? Performance is improved and TCP v4 now uses only 64 bytes per
open request minisock, down from 96 without this patch :-)

Next changeset will rename some of the structs, fields and functions
mentioned above, struct or_calltable is way unclear, better name it
struct request_sock_ops, s/struct open_request/struct request_sock/g,
etc.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Arnaldo Carvalho de Melo
2005-06-18 22:46:52 -07:00
committed by David S. Miller
parent 1944972d3b
commit 2e6599cb89
16 changed files with 341 additions and 230 deletions
Download Patch File Download Diff File Expand all files Collapse all files

39
net/ipv4/syncookies.c
View File

@@ -190,6 +190,8 @@ static inline struct sock *get_cookie_sock(struct sock *sk, struct sk_buff *skb,
struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
struct ip_options *opt)
{
struct inet_request_sock *ireq;
struct tcp_request_sock *treq;
struct tcp_sock *tp = tcp_sk(sk);
__u32 cookie = ntohl(skb->h.th->ack_seq) - 1;
struct sock *ret = sk;
@@ -209,19 +211,20 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
NET_INC_STATS_BH(LINUX_MIB_SYNCOOKIESRECV);
req = tcp_openreq_alloc();
ret = NULL;
req = tcp_openreq_alloc(&or_ipv4); /* for safety */
if (!req)
goto out;
req->rcv_isn = htonl(skb->h.th->seq) - 1;
req->snt_isn = cookie;
ireq = inet_rsk(req);
treq = tcp_rsk(req);
treq->rcv_isn = htonl(skb->h.th->seq) - 1;
treq->snt_isn = cookie;
req->mss = mss;
req->rmt_port = skb->h.th->source;
req->af.v4_req.loc_addr = skb->nh.iph->daddr;
req->af.v4_req.rmt_addr = skb->nh.iph->saddr;
req->class = &or_ipv4; /* for savety */
req->af.v4_req.opt = NULL;
ireq->rmt_port = skb->h.th->source;
ireq->loc_addr = skb->nh.iph->daddr;
ireq->rmt_addr = skb->nh.iph->saddr;
ireq->opt = NULL;
/* We throwed the options of the initial SYN away, so we hope
* the ACK carries the same options again (see RFC1122 4.2.3.8)
@@ -229,17 +232,15 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
if (opt && opt->optlen) {
int opt_size = sizeof(struct ip_options) + opt->optlen;
req->af.v4_req.opt = kmalloc(opt_size, GFP_ATOMIC);
if (req->af.v4_req.opt) {
if (ip_options_echo(req->af.v4_req.opt, skb)) {
kfree(req->af.v4_req.opt);
req->af.v4_req.opt = NULL;
}
ireq->opt = kmalloc(opt_size, GFP_ATOMIC);
if (ireq->opt != NULL && ip_options_echo(ireq->opt, skb)) {
kfree(ireq->opt);
ireq->opt = NULL;
}
}
req->snd_wscale = req->rcv_wscale = req->tstamp_ok = 0;
req->wscale_ok = req->sack_ok = 0;
ireq->snd_wscale = ireq->rcv_wscale = ireq->tstamp_ok = 0;
ireq->wscale_ok = ireq->sack_ok = 0;
req->expires = 0UL;
req->retrans = 0;
@@ -253,8 +254,8 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
struct flowi fl = { .nl_u = { .ip4_u =
{ .daddr = ((opt && opt->srr) ?
opt->faddr :
req->af.v4_req.rmt_addr),
.saddr = req->af.v4_req.loc_addr,
ireq->rmt_addr),
.saddr = ireq->loc_addr,
.tos = RT_CONN_FLAGS(sk) } },
.proto = IPPROTO_TCP,
.uli_u = { .ports =
@@ -272,7 +273,7 @@ struct sock *cookie_v4_check(struct sock *sk, struct sk_buff *skb,
&req->rcv_wnd, &req->window_clamp,
0, &rcv_wscale);
/* BTW win scale with syncookies is 0 by definition */
req->rcv_wscale = rcv_wscale;
ireq->rcv_wscale = rcv_wscale;
ret = get_cookie_sock(sk, skb, req, &rt->u.dst);
out: return ret;