mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-25 02:09:42 +00:00
![Eric W. Biederman](/assets/img/avatar_default.png)
The network namespace is already passed into dst_output pass it into dst->output lwt->output and friends. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> Signed-off-by: David S. Miller <davem@davemloft.net>
229 lines
5.3 KiB
C
229 lines
5.3 KiB
C
#include <linux/errno.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/types.h>
|
|
#include <net/checksum.h>
|
|
#include <net/ip.h>
|
|
#include <net/ip6_fib.h>
|
|
#include <net/lwtunnel.h>
|
|
#include <net/protocol.h>
|
|
#include <uapi/linux/ila.h>
|
|
|
|
struct ila_params {
|
|
__be64 locator;
|
|
__be64 locator_match;
|
|
__wsum csum_diff;
|
|
};
|
|
|
|
static inline struct ila_params *ila_params_lwtunnel(
|
|
struct lwtunnel_state *lwstate)
|
|
{
|
|
return (struct ila_params *)lwstate->data;
|
|
}
|
|
|
|
static inline __wsum compute_csum_diff8(const __be32 *from, const __be32 *to)
|
|
{
|
|
__be32 diff[] = {
|
|
~from[0], ~from[1], to[0], to[1],
|
|
};
|
|
|
|
return csum_partial(diff, sizeof(diff), 0);
|
|
}
|
|
|
|
static inline __wsum get_csum_diff(struct ipv6hdr *ip6h, struct ila_params *p)
|
|
{
|
|
if (*(__be64 *)&ip6h->daddr == p->locator_match)
|
|
return p->csum_diff;
|
|
else
|
|
return compute_csum_diff8((__be32 *)&ip6h->daddr,
|
|
(__be32 *)&p->locator);
|
|
}
|
|
|
|
static void update_ipv6_locator(struct sk_buff *skb, struct ila_params *p)
|
|
{
|
|
__wsum diff;
|
|
struct ipv6hdr *ip6h = ipv6_hdr(skb);
|
|
size_t nhoff = sizeof(struct ipv6hdr);
|
|
|
|
/* First update checksum */
|
|
switch (ip6h->nexthdr) {
|
|
case NEXTHDR_TCP:
|
|
if (likely(pskb_may_pull(skb, nhoff + sizeof(struct tcphdr)))) {
|
|
struct tcphdr *th = (struct tcphdr *)
|
|
(skb_network_header(skb) + nhoff);
|
|
|
|
diff = get_csum_diff(ip6h, p);
|
|
inet_proto_csum_replace_by_diff(&th->check, skb,
|
|
diff, true);
|
|
}
|
|
break;
|
|
case NEXTHDR_UDP:
|
|
if (likely(pskb_may_pull(skb, nhoff + sizeof(struct udphdr)))) {
|
|
struct udphdr *uh = (struct udphdr *)
|
|
(skb_network_header(skb) + nhoff);
|
|
|
|
if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
|
|
diff = get_csum_diff(ip6h, p);
|
|
inet_proto_csum_replace_by_diff(&uh->check, skb,
|
|
diff, true);
|
|
if (!uh->check)
|
|
uh->check = CSUM_MANGLED_0;
|
|
}
|
|
}
|
|
break;
|
|
case NEXTHDR_ICMP:
|
|
if (likely(pskb_may_pull(skb,
|
|
nhoff + sizeof(struct icmp6hdr)))) {
|
|
struct icmp6hdr *ih = (struct icmp6hdr *)
|
|
(skb_network_header(skb) + nhoff);
|
|
|
|
diff = get_csum_diff(ip6h, p);
|
|
inet_proto_csum_replace_by_diff(&ih->icmp6_cksum, skb,
|
|
diff, true);
|
|
}
|
|
break;
|
|
}
|
|
|
|
/* Now change destination address */
|
|
*(__be64 *)&ip6h->daddr = p->locator;
|
|
}
|
|
|
|
static int ila_output(struct net *net, struct sock *sk, struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
|
|
if (skb->protocol != htons(ETH_P_IPV6))
|
|
goto drop;
|
|
|
|
update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));
|
|
|
|
return dst->lwtstate->orig_output(net, sk, skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static int ila_input(struct sk_buff *skb)
|
|
{
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
|
|
if (skb->protocol != htons(ETH_P_IPV6))
|
|
goto drop;
|
|
|
|
update_ipv6_locator(skb, ila_params_lwtunnel(dst->lwtstate));
|
|
|
|
return dst->lwtstate->orig_input(skb);
|
|
|
|
drop:
|
|
kfree_skb(skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
static struct nla_policy ila_nl_policy[ILA_ATTR_MAX + 1] = {
|
|
[ILA_ATTR_LOCATOR] = { .type = NLA_U64, },
|
|
};
|
|
|
|
static int ila_build_state(struct net_device *dev, struct nlattr *nla,
|
|
unsigned int family, const void *cfg,
|
|
struct lwtunnel_state **ts)
|
|
{
|
|
struct ila_params *p;
|
|
struct nlattr *tb[ILA_ATTR_MAX + 1];
|
|
size_t encap_len = sizeof(*p);
|
|
struct lwtunnel_state *newts;
|
|
const struct fib6_config *cfg6 = cfg;
|
|
int ret;
|
|
|
|
if (family != AF_INET6)
|
|
return -EINVAL;
|
|
|
|
ret = nla_parse_nested(tb, ILA_ATTR_MAX, nla,
|
|
ila_nl_policy);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
if (!tb[ILA_ATTR_LOCATOR])
|
|
return -EINVAL;
|
|
|
|
newts = lwtunnel_state_alloc(encap_len);
|
|
if (!newts)
|
|
return -ENOMEM;
|
|
|
|
newts->len = encap_len;
|
|
p = ila_params_lwtunnel(newts);
|
|
|
|
p->locator = (__force __be64)nla_get_u64(tb[ILA_ATTR_LOCATOR]);
|
|
|
|
if (cfg6->fc_dst_len > sizeof(__be64)) {
|
|
/* Precompute checksum difference for translation since we
|
|
* know both the old locator and the new one.
|
|
*/
|
|
p->locator_match = *(__be64 *)&cfg6->fc_dst;
|
|
p->csum_diff = compute_csum_diff8(
|
|
(__be32 *)&p->locator_match, (__be32 *)&p->locator);
|
|
}
|
|
|
|
newts->type = LWTUNNEL_ENCAP_ILA;
|
|
newts->flags |= LWTUNNEL_STATE_OUTPUT_REDIRECT |
|
|
LWTUNNEL_STATE_INPUT_REDIRECT;
|
|
|
|
*ts = newts;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ila_fill_encap_info(struct sk_buff *skb,
|
|
struct lwtunnel_state *lwtstate)
|
|
{
|
|
struct ila_params *p = ila_params_lwtunnel(lwtstate);
|
|
|
|
if (nla_put_u64(skb, ILA_ATTR_LOCATOR, (__force u64)p->locator))
|
|
goto nla_put_failure;
|
|
|
|
return 0;
|
|
|
|
nla_put_failure:
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int ila_encap_nlsize(struct lwtunnel_state *lwtstate)
|
|
{
|
|
/* No encapsulation overhead */
|
|
return 0;
|
|
}
|
|
|
|
static int ila_encap_cmp(struct lwtunnel_state *a, struct lwtunnel_state *b)
|
|
{
|
|
struct ila_params *a_p = ila_params_lwtunnel(a);
|
|
struct ila_params *b_p = ila_params_lwtunnel(b);
|
|
|
|
return (a_p->locator != b_p->locator);
|
|
}
|
|
|
|
static const struct lwtunnel_encap_ops ila_encap_ops = {
|
|
.build_state = ila_build_state,
|
|
.output = ila_output,
|
|
.input = ila_input,
|
|
.fill_encap = ila_fill_encap_info,
|
|
.get_encap_size = ila_encap_nlsize,
|
|
.cmp_encap = ila_encap_cmp,
|
|
};
|
|
|
|
static int __init ila_init(void)
|
|
{
|
|
return lwtunnel_encap_add_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
|
|
}
|
|
|
|
static void __exit ila_fini(void)
|
|
{
|
|
lwtunnel_encap_del_ops(&ila_encap_ops, LWTUNNEL_ENCAP_ILA);
|
|
}
|
|
|
|
module_init(ila_init);
|
|
module_exit(ila_fini);
|
|
MODULE_AUTHOR("Tom Herbert <tom@herbertland.com>");
|
|
MODULE_LICENSE("GPL");
|