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ndisc: Calculate message body length and option length separately.

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Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2013-01-21 06:48:49 +00:00 committed by David S. Miller
parent 5135e633f9
commit 2ce1357614
1 changed files with 11 additions and 9 deletions
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20
net/ipv6/ndisc.c
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@ -426,6 +426,7 @@ static struct sk_buff *ndisc_build_skb(struct net_device *dev,
struct sk_buff *skb;
struct icmp6hdr *hdr;
int len;
int optlen = 0;
u8 *opt;
if (!dev->addr_len)
@ -433,13 +434,13 @@ static struct sk_buff *ndisc_build_skb(struct net_device *dev,
len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0);
if (llinfo)
len += ndisc_opt_addr_space(dev);
optlen += ndisc_opt_addr_space(dev);
skb = ndisc_alloc_skb(dev, len);
skb = ndisc_alloc_skb(dev, len + optlen);
if (!skb)
return NULL;
skb_put(skb, len);
skb_put(skb, len + optlen);
hdr = (struct icmp6hdr *)skb_transport_header(skb);
memcpy(hdr, icmp6h, sizeof(*hdr));
@ -1396,7 +1397,7 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
struct net_device *dev = skb->dev;
struct net *net = dev_net(dev);
struct sock *sk = net->ipv6.ndisc_sk;
int len = sizeof(struct rd_msg);
int optlen = 0;
struct inet_peer *peer;
struct sk_buff *buff;
struct rd_msg *msg;
@ -1463,7 +1464,7 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
memcpy(ha_buf, neigh->ha, dev->addr_len);
read_unlock_bh(&neigh->lock);
ha = ha_buf;
len += ndisc_opt_addr_space(dev);
optlen += ndisc_opt_addr_space(dev);
} else
read_unlock_bh(&neigh->lock);
@ -1471,15 +1472,16 @@ void ndisc_send_redirect(struct sk_buff *skb, const struct in6_addr *target)
}
rd_len = min_t(unsigned int,
IPV6_MIN_MTU-sizeof(struct ipv6hdr)-len, skb->len + 8);
IPV6_MIN_MTU - sizeof(struct ipv6hdr) - sizeof(*msg) - optlen,
skb->len + 8);
rd_len &= ~0x7;
len += rd_len;
optlen += rd_len;
buff = ndisc_alloc_skb(dev, len);
buff = ndisc_alloc_skb(dev, sizeof(*msg) + optlen);
if (!buff)
goto release;
skb_put(buff, len);
skb_put(buff, sizeof(*msg) + optlen);
msg = (struct rd_msg *)icmp6_hdr(buff);
memset(&msg->icmph, 0, sizeof(struct icmp6hdr));