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tcp: pass fl6 to inet6_csk_route_req() 

This commit changes inet_csk_route_req() so that it uses a pointer to
a struct flowi6, rather than allocating its own on the stack. This
brings its behavior in line with its IPv4 cousin,
inet_csk_route_req(), and allows a follow-on patch to fix a dst leak.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neal Cardwell 2012-06-28 12:34:19 +00:00 committed by David S. Miller
parent 9247869ee6
commit 3840a06e60
3 changed files with 19 additions and 15 deletions
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1
include/net/inet6_connection_sock.h
View File

@ -26,6 +26,7 @@ extern int inet6_csk_bind_conflict(const struct sock *sk,
const struct inet_bind_bucket *tb, bool relax);
extern struct dst_entry* inet6_csk_route_req(struct sock *sk,
struct flowi6 *fl6,
const struct request_sock *req);
extern struct request_sock *inet6_csk_search_req(const struct sock *sk,

24
net/ipv6/inet6_connection_sock.c
View File

@ -55,26 +55,26 @@ int inet6_csk_bind_conflict(const struct sock *sk,
EXPORT_SYMBOL_GPL(inet6_csk_bind_conflict);
struct dst_entry *inet6_csk_route_req(struct sock *sk,
struct flowi6 *fl6,
const struct request_sock *req)
{
struct inet6_request_sock *treq = inet6_rsk(req);
struct ipv6_pinfo *np = inet6_sk(sk);
struct in6_addr *final_p, final;
struct dst_entry *dst;
struct flowi6 fl6;
memset(&fl6, 0, sizeof(fl6));
fl6.flowi6_proto = IPPROTO_TCP;
fl6.daddr = treq->rmt_addr;
final_p = fl6_update_dst(&fl6, np->opt, &final);
fl6.saddr = treq->loc_addr;
fl6.flowi6_oif = treq->iif;
fl6.flowi6_mark = sk->sk_mark;
fl6.fl6_dport = inet_rsk(req)->rmt_port;
fl6.fl6_sport = inet_rsk(req)->loc_port;
security_req_classify_flow(req, flowi6_to_flowi(&fl6));
memset(fl6, 0, sizeof(*fl6));
fl6->flowi6_proto = IPPROTO_TCP;
fl6->daddr = treq->rmt_addr;
final_p = fl6_update_dst(fl6, np->opt, &final);
fl6->saddr = treq->loc_addr;
fl6->flowi6_oif = treq->iif;
fl6->flowi6_mark = sk->sk_mark;
fl6->fl6_dport = inet_rsk(req)->rmt_port;
fl6->fl6_sport = inet_rsk(req)->loc_port;
security_req_classify_flow(req, flowi6_to_flowi(fl6));
dst = ip6_dst_lookup_flow(sk, &fl6, final_p, false);
dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
if (IS_ERR(dst))
return NULL;

9
net/ipv6/tcp_ipv6.c
View File

@ -477,7 +477,8 @@ out:
}
static int tcp_v6_send_synack(struct sock *sk, struct request_sock *req,
static int tcp_v6_send_synack(struct sock *sk,
struct request_sock *req,
struct request_values *rvp,
u16 queue_mapping)
{
@ -1058,6 +1059,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
struct tcp_sock *tp = tcp_sk(sk);
__u32 isn = TCP_SKB_CB(skb)->when;
struct dst_entry *dst = NULL;
struct flowi6 fl6;
bool want_cookie = false;
if (skb->protocol == htons(ETH_P_IP))
@ -1177,7 +1179,7 @@ static int tcp_v6_conn_request(struct sock *sk, struct sk_buff *skb)
*/
if (tmp_opt.saw_tstamp &&
tcp_death_row.sysctl_tw_recycle &&
(dst = inet6_csk_route_req(sk, req)) != NULL &&
(dst = inet6_csk_route_req(sk, &fl6, req)) != NULL &&
(peer = rt6_get_peer((struct rt6_info *)dst)) != NULL &&
ipv6_addr_equal((struct in6_addr *)peer->daddr.addr.a6,
&treq->rmt_addr)) {
@ -1247,6 +1249,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
#ifdef CONFIG_TCP_MD5SIG
struct tcp_md5sig_key *key;
#endif
struct flowi6 fl6;
if (skb->protocol == htons(ETH_P_IP)) {
/*
@ -1309,7 +1312,7 @@ static struct sock * tcp_v6_syn_recv_sock(struct sock *sk, struct sk_buff *skb,
goto out_overflow;
if (!dst) {
dst = inet6_csk_route_req(sk, req);
dst = inet6_csk_route_req(sk, &fl6, req);
if (!dst)
goto out;
}