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ipv6: hash net ptr into fragmentation bucket selection 

As namespaces are sometimes used with overlapping ip address ranges,
we should also use the namespace as input to the hash to select the ip
fragmentation counter bucket.

Cc: Eric Dumazet <edumazet@google.com>
Cc: Flavio Leitner <fbl@redhat.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hannes Frederic Sowa 2015-03-25 17:07:45 +01:00 committed by David S. Miller
parent b6a7719aed
commit 5a352dd0a3
4 changed files with 16 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/ipv6.h
View File

@ -671,8 +671,9 @@ static inline int ipv6_addr_diff(const struct in6_addr *a1, const struct in6_add
return __ipv6_addr_diff(a1, a2, sizeof(struct in6_addr));
}
void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt);
void ipv6_proxy_select_ident(struct sk_buff *skb);
void ipv6_select_ident(struct net *net, struct frag_hdr *fhdr,
struct rt6_info *rt);
void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb);
int ip6_dst_hoplimit(struct dst_entry *dst);

6
net/ipv6/ip6_output.c
View File

@ -628,7 +628,7 @@ int ip6_fragment(struct sk_buff *skb, int (*output)(struct sk_buff *))
skb_reset_network_header(skb);
memcpy(skb_network_header(skb), tmp_hdr, hlen);
ipv6_select_ident(fh, rt);
ipv6_select_ident(net, fh, rt);
fh->nexthdr = nexthdr;
fh->reserved = 0;
fh->frag_off = htons(IP6_MF);
@ -775,7 +775,7 @@ slow_path:
fh->nexthdr = nexthdr;
fh->reserved = 0;
if (!frag_id) {
ipv6_select_ident(fh, rt);
ipv6_select_ident(net, fh, rt);
frag_id = fh->identification;
} else
fh->identification = frag_id;
@ -1079,7 +1079,7 @@ static inline int ip6_ufo_append_data(struct sock *sk,
skb_shinfo(skb)->gso_size = (mtu - fragheaderlen -
sizeof(struct frag_hdr)) & ~7;
skb_shinfo(skb)->gso_type = SKB_GSO_UDP;
ipv6_select_ident(&fhdr, rt);
ipv6_select_ident(sock_net(sk), &fhdr, rt);
skb_shinfo(skb)->ip6_frag_id = fhdr.identification;
append:

14
net/ipv6/output_core.c
View File

@ -9,13 +9,14 @@
#include <net/addrconf.h>
#include <net/secure_seq.h>
static u32 __ipv6_select_ident(u32 hashrnd, struct in6_addr *dst,
struct in6_addr *src)
static u32 __ipv6_select_ident(struct net *net, u32 hashrnd,
struct in6_addr *dst, struct in6_addr *src)
{
u32 hash, id;
hash = __ipv6_addr_jhash(dst, hashrnd);
hash = __ipv6_addr_jhash(src, hash);
hash ^= net_hash_mix(net);
/* Treat id of 0 as unset and if we get 0 back from ip_idents_reserve,
* set the hight order instead thus minimizing possible future
@ -36,7 +37,7 @@ static u32 __ipv6_select_ident(u32 hashrnd, struct in6_addr *dst,
*
* The network header must be set before calling this.
*/
void ipv6_proxy_select_ident(struct sk_buff *skb)
void ipv6_proxy_select_ident(struct net *net, struct sk_buff *skb)
{
static u32 ip6_proxy_idents_hashrnd __read_mostly;
struct in6_addr buf[2];
@ -53,20 +54,21 @@ void ipv6_proxy_select_ident(struct sk_buff *skb)
net_get_random_once(&ip6_proxy_idents_hashrnd,
sizeof(ip6_proxy_idents_hashrnd));
id = __ipv6_select_ident(ip6_proxy_idents_hashrnd,
id = __ipv6_select_ident(net, ip6_proxy_idents_hashrnd,
&addrs[1], &addrs[0]);
skb_shinfo(skb)->ip6_frag_id = htonl(id);
}
EXPORT_SYMBOL_GPL(ipv6_proxy_select_ident);
void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
void ipv6_select_ident(struct net *net, struct frag_hdr *fhdr,
struct rt6_info *rt)
{
static u32 ip6_idents_hashrnd __read_mostly;
u32 id;
net_get_random_once(&ip6_idents_hashrnd, sizeof(ip6_idents_hashrnd));
id = __ipv6_select_ident(ip6_idents_hashrnd, &rt->rt6i_dst.addr,
id = __ipv6_select_ident(net, ip6_idents_hashrnd, &rt->rt6i_dst.addr,
&rt->rt6i_src.addr);
fhdr->identification = htonl(id);
}

4
net/ipv6/udp_offload.c
View File

@ -54,7 +54,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
/* Set the IPv6 fragment id if not set yet */
if (!skb_shinfo(skb)->ip6_frag_id)
ipv6_proxy_select_ident(skb);
ipv6_proxy_select_ident(dev_net(skb->dev), skb);
segs = NULL;
goto out;
@ -113,7 +113,7 @@ static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb,
fptr->nexthdr = nexthdr;
fptr->reserved = 0;
if (!skb_shinfo(skb)->ip6_frag_id)
ipv6_proxy_select_ident(skb);
ipv6_proxy_select_ident(dev_net(skb->dev), skb);
fptr->identification = skb_shinfo(skb)->ip6_frag_id;
/* Fragment the skb. ipv6 header and the remaining fields of the