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authorVille Nuorvala <vnuorval@tcs.hut.fi>2006-11-24 17:08:32 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-12-02 21:30:26 -0800
commit6fb32ddeb2502292bb89e17f58600ce265598ed7 (patch)
tree4870680606e4dad418c52de2cd5a842ce53fed2c /net/ipv6/ip6_tunnel.c
parent305d4b3ce8c2f00643edc3bb19f005f72e8f84fc (diff)
downloadlwn-6fb32ddeb2502292bb89e17f58600ce265598ed7.tar.gz
lwn-6fb32ddeb2502292bb89e17f58600ce265598ed7.zip
[IPV6]: Don't allocate memory for Tunnel Encapsulation Limit Option
Signed-off-by: Ville Nuorvala <vnuorval@tcs.hut.fi> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6/ip6_tunnel.c')
-rw-r--r--net/ipv6/ip6_tunnel.c58
1 files changed, 22 insertions, 36 deletions
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 3944ea24c38c..daad1e5a2a85 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -572,31 +572,23 @@ discard:
return 0;
}
-static inline struct ipv6_txoptions *create_tel(__u8 encap_limit)
-{
- struct ipv6_tlv_tnl_enc_lim *tel;
- struct ipv6_txoptions *opt;
- __u8 *raw;
-
- int opt_len = sizeof(*opt) + 8;
-
- if (!(opt = kzalloc(opt_len, GFP_ATOMIC))) {
- return NULL;
- }
- opt->tot_len = opt_len;
- opt->dst0opt = (struct ipv6_opt_hdr *) (opt + 1);
- opt->opt_nflen = 8;
+struct ipv6_tel_txoption {
+ struct ipv6_txoptions ops;
+ __u8 dst_opt[8];
+};
- tel = (struct ipv6_tlv_tnl_enc_lim *) (opt->dst0opt + 1);
- tel->type = IPV6_TLV_TNL_ENCAP_LIMIT;
- tel->length = 1;
- tel->encap_limit = encap_limit;
+static void init_tel_txopt(struct ipv6_tel_txoption *opt, __u8 encap_limit)
+{
+ memset(opt, 0, sizeof(struct ipv6_tel_txoption));
- raw = (__u8 *) opt->dst0opt;
- raw[5] = IPV6_TLV_PADN;
- raw[6] = 1;
+ opt->dst_opt[2] = IPV6_TLV_TNL_ENCAP_LIMIT;
+ opt->dst_opt[3] = 1;
+ opt->dst_opt[4] = encap_limit;
+ opt->dst_opt[5] = IPV6_TLV_PADN;
+ opt->dst_opt[6] = 1;
- return opt;
+ opt->ops.dst0opt = (struct ipv6_opt_hdr *) opt->dst_opt;
+ opt->ops.opt_nflen = 8;
}
/**
@@ -666,8 +658,8 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
struct ip6_tnl *t = netdev_priv(dev);
struct net_device_stats *stats = &t->stat;
struct ipv6hdr *ipv6h = skb->nh.ipv6h;
- struct ipv6_txoptions *opt = NULL;
int encap_limit = -1;
+ struct ipv6_tel_txoption opt;
__u16 offset;
struct flowi fl;
struct dst_entry *dst;
@@ -696,9 +688,9 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
goto tx_err;
}
encap_limit = tel->encap_limit - 1;
- } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT)) {
+ } else if (!(t->parms.flags & IP6_TNL_F_IGN_ENCAP_LIMIT))
encap_limit = t->parms.encap_limit;
- }
+
memcpy(&fl, &t->fl, sizeof (fl));
proto = fl.proto;
@@ -708,9 +700,6 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
if ((t->parms.flags & IP6_TNL_F_USE_ORIG_FLOWLABEL))
fl.fl6_flowlabel |= (*(__be32 *) ipv6h & IPV6_FLOWLABEL_MASK);
- if (encap_limit >= 0 && (opt = create_tel(encap_limit)) == NULL)
- goto tx_err;
-
if ((dst = ip6_tnl_dst_check(t)) != NULL)
dst_hold(dst);
else {
@@ -731,7 +720,7 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
goto tx_err_dst_release;
}
mtu = dst_mtu(dst) - sizeof (*ipv6h);
- if (opt) {
+ if (encap_limit >= 0) {
max_headroom += 8;
mtu -= 8;
}
@@ -769,9 +758,10 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
skb->h.raw = skb->nh.raw;
- if (opt)
- ipv6_push_nfrag_opts(skb, opt, &proto, NULL);
-
+ if (encap_limit >= 0) {
+ init_tel_txopt(&opt, encap_limit);
+ ipv6_push_nfrag_opts(skb, &opt.ops, &proto, NULL);
+ }
skb->nh.raw = skb_push(skb, sizeof(struct ipv6hdr));
ipv6h = skb->nh.ipv6h;
*(__be32*)ipv6h = fl.fl6_flowlabel | htonl(0x60000000);
@@ -795,9 +785,6 @@ ip6ip6_tnl_xmit(struct sk_buff *skb, struct net_device *dev)
stats->tx_aborted_errors++;
}
ip6_tnl_dst_store(t, dst);
-
- kfree(opt);
-
t->recursion--;
return 0;
tx_err_link_failure:
@@ -805,7 +792,6 @@ tx_err_link_failure:
dst_link_failure(skb);
tx_err_dst_release:
dst_release(dst);
- kfree(opt);
tx_err:
stats->tx_errors++;
stats->tx_dropped++;