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path: root/net/ipv6/ip6_output.c
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Diffstat (limited to 'net/ipv6/ip6_output.c')
-rw-r--r--net/ipv6/ip6_output.c99
1 files changed, 54 insertions, 45 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 2995f8d89e7e..0c6c971ce0a5 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1350,11 +1350,16 @@ static void ip6_append_data_mtu(unsigned int *mtu,
static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
struct inet6_cork *v6_cork, struct ipcm6_cookie *ipc6,
- struct rt6_info *rt, struct flowi6 *fl6)
+ struct rt6_info *rt)
{
struct ipv6_pinfo *np = inet6_sk(sk);
unsigned int mtu;
- struct ipv6_txoptions *opt = ipc6->opt;
+ struct ipv6_txoptions *nopt, *opt = ipc6->opt;
+
+ /* callers pass dst together with a reference, set it first so
+ * ip6_cork_release() can put it down even in case of an error.
+ */
+ cork->base.dst = &rt->dst;
/*
* setup for corking
@@ -1363,39 +1368,32 @@ static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
if (WARN_ON(v6_cork->opt))
return -EINVAL;
- v6_cork->opt = kzalloc(sizeof(*opt), sk->sk_allocation);
- if (unlikely(!v6_cork->opt))
+ nopt = v6_cork->opt = kzalloc(sizeof(*opt), sk->sk_allocation);
+ if (unlikely(!nopt))
return -ENOBUFS;
- v6_cork->opt->tot_len = sizeof(*opt);
- v6_cork->opt->opt_flen = opt->opt_flen;
- v6_cork->opt->opt_nflen = opt->opt_nflen;
+ nopt->tot_len = sizeof(*opt);
+ nopt->opt_flen = opt->opt_flen;
+ nopt->opt_nflen = opt->opt_nflen;
- v6_cork->opt->dst0opt = ip6_opt_dup(opt->dst0opt,
- sk->sk_allocation);
- if (opt->dst0opt && !v6_cork->opt->dst0opt)
+ nopt->dst0opt = ip6_opt_dup(opt->dst0opt, sk->sk_allocation);
+ if (opt->dst0opt && !nopt->dst0opt)
return -ENOBUFS;
- v6_cork->opt->dst1opt = ip6_opt_dup(opt->dst1opt,
- sk->sk_allocation);
- if (opt->dst1opt && !v6_cork->opt->dst1opt)
+ nopt->dst1opt = ip6_opt_dup(opt->dst1opt, sk->sk_allocation);
+ if (opt->dst1opt && !nopt->dst1opt)
return -ENOBUFS;
- v6_cork->opt->hopopt = ip6_opt_dup(opt->hopopt,
- sk->sk_allocation);
- if (opt->hopopt && !v6_cork->opt->hopopt)
+ nopt->hopopt = ip6_opt_dup(opt->hopopt, sk->sk_allocation);
+ if (opt->hopopt && !nopt->hopopt)
return -ENOBUFS;
- v6_cork->opt->srcrt = ip6_rthdr_dup(opt->srcrt,
- sk->sk_allocation);
- if (opt->srcrt && !v6_cork->opt->srcrt)
+ nopt->srcrt = ip6_rthdr_dup(opt->srcrt, sk->sk_allocation);
+ if (opt->srcrt && !nopt->srcrt)
return -ENOBUFS;
/* need source address above miyazawa*/
}
- dst_hold(&rt->dst);
- cork->base.dst = &rt->dst;
- cork->fl.u.ip6 = *fl6;
v6_cork->hop_limit = ipc6->hlimit;
v6_cork->tclass = ipc6->tclass;
if (rt->dst.flags & DST_XFRM_TUNNEL)
@@ -1426,9 +1424,8 @@ static int ip6_setup_cork(struct sock *sk, struct inet_cork_full *cork,
}
static int __ip6_append_data(struct sock *sk,
- struct flowi6 *fl6,
struct sk_buff_head *queue,
- struct inet_cork *cork,
+ struct inet_cork_full *cork_full,
struct inet6_cork *v6_cork,
struct page_frag *pfrag,
int getfrag(void *from, char *to, int offset,
@@ -1437,6 +1434,8 @@ static int __ip6_append_data(struct sock *sk,
unsigned int flags, struct ipcm6_cookie *ipc6)
{
struct sk_buff *skb, *skb_prev = NULL;
+ struct inet_cork *cork = &cork_full->base;
+ struct flowi6 *fl6 = &cork_full->fl.u.ip6;
unsigned int maxfraglen, fragheaderlen, mtu, orig_mtu, pmtu;
struct ubuf_info *uarg = NULL;
int exthdrlen = 0;
@@ -1788,34 +1787,46 @@ int ip6_append_data(struct sock *sk,
/*
* setup for corking
*/
+ dst_hold(&rt->dst);
err = ip6_setup_cork(sk, &inet->cork, &np->cork,
- ipc6, rt, fl6);
+ ipc6, rt);
if (err)
return err;
+ inet->cork.fl.u.ip6 = *fl6;
exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
length += exthdrlen;
transhdrlen += exthdrlen;
} else {
- fl6 = &inet->cork.fl.u.ip6;
transhdrlen = 0;
}
- return __ip6_append_data(sk, fl6, &sk->sk_write_queue, &inet->cork.base,
+ return __ip6_append_data(sk, &sk->sk_write_queue, &inet->cork,
&np->cork, sk_page_frag(sk), getfrag,
from, length, transhdrlen, flags, ipc6);
}
EXPORT_SYMBOL_GPL(ip6_append_data);
+static void ip6_cork_steal_dst(struct sk_buff *skb, struct inet_cork_full *cork)
+{
+ struct dst_entry *dst = cork->base.dst;
+
+ cork->base.dst = NULL;
+ cork->base.flags &= ~IPCORK_ALLFRAG;
+ skb_dst_set(skb, dst);
+}
+
static void ip6_cork_release(struct inet_cork_full *cork,
struct inet6_cork *v6_cork)
{
if (v6_cork->opt) {
- kfree(v6_cork->opt->dst0opt);
- kfree(v6_cork->opt->dst1opt);
- kfree(v6_cork->opt->hopopt);
- kfree(v6_cork->opt->srcrt);
- kfree(v6_cork->opt);
+ struct ipv6_txoptions *opt = v6_cork->opt;
+
+ kfree(opt->dst0opt);
+ kfree(opt->dst1opt);
+ kfree(opt->hopopt);
+ kfree(opt->srcrt);
+ kfree(opt);
v6_cork->opt = NULL;
}
@@ -1824,7 +1835,6 @@ static void ip6_cork_release(struct inet_cork_full *cork,
cork->base.dst = NULL;
cork->base.flags &= ~IPCORK_ALLFRAG;
}
- memset(&cork->fl, 0, sizeof(cork->fl));
}
struct sk_buff *__ip6_make_skb(struct sock *sk,
@@ -1834,7 +1844,7 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
{
struct sk_buff *skb, *tmp_skb;
struct sk_buff **tail_skb;
- struct in6_addr final_dst_buf, *final_dst = &final_dst_buf;
+ struct in6_addr *final_dst;
struct ipv6_pinfo *np = inet6_sk(sk);
struct net *net = sock_net(sk);
struct ipv6hdr *hdr;
@@ -1864,9 +1874,9 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
/* Allow local fragmentation. */
skb->ignore_df = ip6_sk_ignore_df(sk);
-
- *final_dst = fl6->daddr;
__skb_pull(skb, skb_network_header_len(skb));
+
+ final_dst = &fl6->daddr;
if (opt && opt->opt_flen)
ipv6_push_frag_opts(skb, opt, &proto);
if (opt && opt->opt_nflen)
@@ -1886,10 +1896,9 @@ struct sk_buff *__ip6_make_skb(struct sock *sk,
skb->priority = sk->sk_priority;
skb->mark = cork->base.mark;
-
skb->tstamp = cork->base.transmit_time;
- skb_dst_set(skb, dst_clone(&rt->dst));
+ ip6_cork_steal_dst(skb, cork);
IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
if (proto == IPPROTO_ICMPV6) {
struct inet6_dev *idev = ip6_dst_idev(skb_dst(skb));
@@ -1961,26 +1970,26 @@ struct sk_buff *ip6_make_skb(struct sock *sk,
int getfrag(void *from, char *to, int offset,
int len, int odd, struct sk_buff *skb),
void *from, int length, int transhdrlen,
- struct ipcm6_cookie *ipc6, struct flowi6 *fl6,
- struct rt6_info *rt, unsigned int flags,
- struct inet_cork_full *cork)
+ struct ipcm6_cookie *ipc6, struct rt6_info *rt,
+ unsigned int flags, struct inet_cork_full *cork)
{
struct inet6_cork v6_cork;
struct sk_buff_head queue;
int exthdrlen = (ipc6->opt ? ipc6->opt->opt_flen : 0);
int err;
- if (flags & MSG_PROBE)
+ if (flags & MSG_PROBE) {
+ dst_release(&rt->dst);
return NULL;
+ }
__skb_queue_head_init(&queue);
cork->base.flags = 0;
cork->base.addr = 0;
cork->base.opt = NULL;
- cork->base.dst = NULL;
v6_cork.opt = NULL;
- err = ip6_setup_cork(sk, cork, &v6_cork, ipc6, rt, fl6);
+ err = ip6_setup_cork(sk, cork, &v6_cork, ipc6, rt);
if (err) {
ip6_cork_release(cork, &v6_cork);
return ERR_PTR(err);
@@ -1988,7 +1997,7 @@ struct sk_buff *ip6_make_skb(struct sock *sk,
if (ipc6->dontfrag < 0)
ipc6->dontfrag = inet6_sk(sk)->dontfrag;
- err = __ip6_append_data(sk, fl6, &queue, &cork->base, &v6_cork,
+ err = __ip6_append_data(sk, &queue, cork, &v6_cork,
&current->task_frag, getfrag, from,
length + exthdrlen, transhdrlen + exthdrlen,
flags, ipc6);
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