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ipv6: Remove all uses of LL_ALLOCATED_SPACE
ipv6: Remove all uses of LL_ALLOCATED_SPACE The macro LL_ALLOCATED_SPACE was ill-conceived. It applies the alignment to the sum of needed_headroom and needed_tailroom. As the amount that is then reserved for head room is needed_headroom with alignment, this means that the tail room left may be too small. This patch replaces all uses of LL_ALLOCATED_SPACE in net/ipv6 with the macro LL_RESERVED_SPACE and direct reference to needed_tailroom. This also fixes the problem with needed_headroom changing between allocating the skb and reserving the head room. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Herbert Xu
David S. Miller
parent
6608824329
commit
a7ae199224
@ -631,6 +631,7 @@ int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
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struct ipv6hdr *tmp_hdr;
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struct frag_hdr *fh;
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unsigned int mtu, hlen, left, len;
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int hroom, troom;
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__be32 frag_id = 0;
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int ptr, offset = 0, err=0;
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u8 *prevhdr, nexthdr = 0;
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@ -797,6 +798,8 @@ slow_path:
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*/
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*prevhdr = NEXTHDR_FRAGMENT;
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hroom = LL_RESERVED_SPACE(rt->dst.dev);
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troom = rt->dst.dev->needed_tailroom;
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/*
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* Keep copying data until we run out.
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@ -815,7 +818,8 @@ slow_path:
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* Allocate buffer.
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*/
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if ((frag = alloc_skb(len+hlen+sizeof(struct frag_hdr)+LL_ALLOCATED_SPACE(rt->dst.dev), GFP_ATOMIC)) == NULL) {
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if ((frag = alloc_skb(len + hlen + sizeof(struct frag_hdr) +
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hroom + troom, GFP_ATOMIC)) == NULL) {
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NETDEBUG(KERN_INFO "IPv6: frag: no memory for new fragment!\n");
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IP6_INC_STATS(net, ip6_dst_idev(skb_dst(skb)),
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IPSTATS_MIB_FRAGFAILS);
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@ -828,7 +832,7 @@ slow_path:
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*/
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ip6_copy_metadata(frag, skb);
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skb_reserve(frag, LL_RESERVED_SPACE(rt->dst.dev));
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skb_reserve(frag, hroom);
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skb_put(frag, len + hlen + sizeof(struct frag_hdr));
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skb_reset_network_header(frag);
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fh = (struct frag_hdr *)(skb_network_header(frag) + hlen);
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@ -1343,13 +1343,15 @@ static struct sk_buff *mld_newpack(struct net_device *dev, int size)
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struct mld2_report *pmr;
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struct in6_addr addr_buf;
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const struct in6_addr *saddr;
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int hlen = LL_RESERVED_SPACE(dev);
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int tlen = dev->needed_tailroom;
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int err;
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u8 ra[8] = { IPPROTO_ICMPV6, 0,
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IPV6_TLV_ROUTERALERT, 2, 0, 0,
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IPV6_TLV_PADN, 0 };
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/* we assume size > sizeof(ra) here */
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size += LL_ALLOCATED_SPACE(dev);
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size += hlen + tlen;
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/* limit our allocations to order-0 page */
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size = min_t(int, size, SKB_MAX_ORDER(0, 0));
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skb = sock_alloc_send_skb(sk, size, 1, &err);
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@ -1357,7 +1359,7 @@ static struct sk_buff *mld_newpack(struct net_device *dev, int size)
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if (!skb)
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return NULL;
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skb_reserve(skb, LL_RESERVED_SPACE(dev));
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skb_reserve(skb, hlen);
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if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
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/* <draft-ietf-magma-mld-source-05.txt>:
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@ -1723,6 +1725,8 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
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struct mld_msg *hdr;
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const struct in6_addr *snd_addr, *saddr;
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struct in6_addr addr_buf;
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int hlen = LL_RESERVED_SPACE(dev);
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int tlen = dev->needed_tailroom;
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int err, len, payload_len, full_len;
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u8 ra[8] = { IPPROTO_ICMPV6, 0,
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IPV6_TLV_ROUTERALERT, 2, 0, 0,
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@ -1744,7 +1748,7 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
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IPSTATS_MIB_OUT, full_len);
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rcu_read_unlock();
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skb = sock_alloc_send_skb(sk, LL_ALLOCATED_SPACE(dev) + full_len, 1, &err);
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skb = sock_alloc_send_skb(sk, hlen + tlen + full_len, 1, &err);
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if (skb == NULL) {
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rcu_read_lock();
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@ -1754,7 +1758,7 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
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return;
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}
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skb_reserve(skb, LL_RESERVED_SPACE(dev));
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skb_reserve(skb, hlen);
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if (ipv6_get_lladdr(dev, &addr_buf, IFA_F_TENTATIVE)) {
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/* <draft-ietf-magma-mld-source-05.txt>:
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@ -446,6 +446,8 @@ struct sk_buff *ndisc_build_skb(struct net_device *dev,
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struct sock *sk = net->ipv6.ndisc_sk;
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struct sk_buff *skb;
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struct icmp6hdr *hdr;
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int hlen = LL_RESERVED_SPACE(dev);
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int tlen = dev->needed_tailroom;
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int len;
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int err;
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u8 *opt;
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@ -459,7 +461,7 @@ struct sk_buff *ndisc_build_skb(struct net_device *dev,
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skb = sock_alloc_send_skb(sk,
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(MAX_HEADER + sizeof(struct ipv6hdr) +
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len + LL_ALLOCATED_SPACE(dev)),
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len + hlen + tlen),
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1, &err);
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if (!skb) {
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ND_PRINTK0(KERN_ERR
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@ -468,7 +470,7 @@ struct sk_buff *ndisc_build_skb(struct net_device *dev,
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return NULL;
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}
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skb_reserve(skb, LL_RESERVED_SPACE(dev));
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skb_reserve(skb, hlen);
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ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len);
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skb->transport_header = skb->tail;
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@ -1533,6 +1535,7 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
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struct inet6_dev *idev;
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struct flowi6 fl6;
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u8 *opt;
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int hlen, tlen;
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int rd_len;
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int err;
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u8 ha_buf[MAX_ADDR_LEN], *ha = NULL;
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@ -1590,9 +1593,11 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
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rd_len &= ~0x7;
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len += rd_len;
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hlen = LL_RESERVED_SPACE(dev);
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tlen = dev->needed_tailroom;
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buff = sock_alloc_send_skb(sk,
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(MAX_HEADER + sizeof(struct ipv6hdr) +
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len + LL_ALLOCATED_SPACE(dev)),
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len + hlen + tlen),
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1, &err);
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if (buff == NULL) {
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ND_PRINTK0(KERN_ERR
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@ -1601,7 +1606,7 @@ void ndisc_send_redirect(struct sk_buff *skb, struct neighbour *neigh,
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goto release;
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}
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skb_reserve(buff, LL_RESERVED_SPACE(dev));
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skb_reserve(buff, hlen);
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ip6_nd_hdr(sk, buff, dev, &saddr_buf, &ipv6_hdr(skb)->saddr,
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IPPROTO_ICMPV6, len);
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@ -611,6 +611,8 @@ static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
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struct sk_buff *skb;
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int err;
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struct rt6_info *rt = (struct rt6_info *)*dstp;
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int hlen = LL_RESERVED_SPACE(rt->dst.dev);
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int tlen = rt->dst.dev->needed_tailroom;
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if (length > rt->dst.dev->mtu) {
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ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
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@ -620,11 +622,11 @@ static int rawv6_send_hdrinc(struct sock *sk, void *from, int length,
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goto out;
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skb = sock_alloc_send_skb(sk,
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length + LL_ALLOCATED_SPACE(rt->dst.dev) + 15,
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length + hlen + tlen + 15,
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flags & MSG_DONTWAIT, &err);
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if (skb == NULL)
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goto error;
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skb_reserve(skb, LL_RESERVED_SPACE(rt->dst.dev));
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skb_reserve(skb, hlen);
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skb->priority = sk->sk_priority;
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skb->mark = sk->sk_mark;
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