mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 10:46:40 +07:00
b71d1d426d
Add const qualifiers to structs iphdr, ipv6hdr and in6_addr pointers where possible, to make code intention more obvious. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
358 lines
8.6 KiB
C
358 lines
8.6 KiB
C
/*
|
|
* xfrm6_policy.c: based on xfrm4_policy.c
|
|
*
|
|
* Authors:
|
|
* Mitsuru KANDA @USAGI
|
|
* Kazunori MIYAZAWA @USAGI
|
|
* Kunihiro Ishiguro <kunihiro@ipinfusion.com>
|
|
* IPv6 support
|
|
* YOSHIFUJI Hideaki
|
|
* Split up af-specific portion
|
|
*
|
|
*/
|
|
|
|
#include <linux/err.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/netdevice.h>
|
|
#include <net/addrconf.h>
|
|
#include <net/dst.h>
|
|
#include <net/xfrm.h>
|
|
#include <net/ip.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ip6_route.h>
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
|
#include <net/mip6.h>
|
|
#endif
|
|
|
|
static struct xfrm_policy_afinfo xfrm6_policy_afinfo;
|
|
|
|
static struct dst_entry *xfrm6_dst_lookup(struct net *net, int tos,
|
|
const xfrm_address_t *saddr,
|
|
const xfrm_address_t *daddr)
|
|
{
|
|
struct flowi6 fl6;
|
|
struct dst_entry *dst;
|
|
int err;
|
|
|
|
memset(&fl6, 0, sizeof(fl6));
|
|
memcpy(&fl6.daddr, daddr, sizeof(fl6.daddr));
|
|
if (saddr)
|
|
memcpy(&fl6.saddr, saddr, sizeof(fl6.saddr));
|
|
|
|
dst = ip6_route_output(net, NULL, &fl6);
|
|
|
|
err = dst->error;
|
|
if (dst->error) {
|
|
dst_release(dst);
|
|
dst = ERR_PTR(err);
|
|
}
|
|
|
|
return dst;
|
|
}
|
|
|
|
static int xfrm6_get_saddr(struct net *net,
|
|
xfrm_address_t *saddr, xfrm_address_t *daddr)
|
|
{
|
|
struct dst_entry *dst;
|
|
struct net_device *dev;
|
|
|
|
dst = xfrm6_dst_lookup(net, 0, NULL, daddr);
|
|
if (IS_ERR(dst))
|
|
return -EHOSTUNREACH;
|
|
|
|
dev = ip6_dst_idev(dst)->dev;
|
|
ipv6_dev_get_saddr(dev_net(dev), dev,
|
|
(struct in6_addr *)&daddr->a6, 0,
|
|
(struct in6_addr *)&saddr->a6);
|
|
dst_release(dst);
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_get_tos(const struct flowi *fl)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_init_path(struct xfrm_dst *path, struct dst_entry *dst,
|
|
int nfheader_len)
|
|
{
|
|
if (dst->ops->family == AF_INET6) {
|
|
struct rt6_info *rt = (struct rt6_info*)dst;
|
|
if (rt->rt6i_node)
|
|
path->path_cookie = rt->rt6i_node->fn_sernum;
|
|
}
|
|
|
|
path->u.rt6.rt6i_nfheader_len = nfheader_len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int xfrm6_fill_dst(struct xfrm_dst *xdst, struct net_device *dev,
|
|
const struct flowi *fl)
|
|
{
|
|
struct rt6_info *rt = (struct rt6_info*)xdst->route;
|
|
|
|
xdst->u.dst.dev = dev;
|
|
dev_hold(dev);
|
|
|
|
xdst->u.rt6.rt6i_idev = in6_dev_get(dev);
|
|
if (!xdst->u.rt6.rt6i_idev)
|
|
return -ENODEV;
|
|
|
|
xdst->u.rt6.rt6i_peer = rt->rt6i_peer;
|
|
if (rt->rt6i_peer)
|
|
atomic_inc(&rt->rt6i_peer->refcnt);
|
|
|
|
/* Sheit... I remember I did this right. Apparently,
|
|
* it was magically lost, so this code needs audit */
|
|
xdst->u.rt6.rt6i_flags = rt->rt6i_flags & (RTF_ANYCAST |
|
|
RTF_LOCAL);
|
|
xdst->u.rt6.rt6i_metric = rt->rt6i_metric;
|
|
xdst->u.rt6.rt6i_node = rt->rt6i_node;
|
|
if (rt->rt6i_node)
|
|
xdst->route_cookie = rt->rt6i_node->fn_sernum;
|
|
xdst->u.rt6.rt6i_gateway = rt->rt6i_gateway;
|
|
xdst->u.rt6.rt6i_dst = rt->rt6i_dst;
|
|
xdst->u.rt6.rt6i_src = rt->rt6i_src;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline void
|
|
_decode_session6(struct sk_buff *skb, struct flowi *fl, int reverse)
|
|
{
|
|
struct flowi6 *fl6 = &fl->u.ip6;
|
|
int onlyproto = 0;
|
|
u16 offset = skb_network_header_len(skb);
|
|
const struct ipv6hdr *hdr = ipv6_hdr(skb);
|
|
struct ipv6_opt_hdr *exthdr;
|
|
const unsigned char *nh = skb_network_header(skb);
|
|
u8 nexthdr = nh[IP6CB(skb)->nhoff];
|
|
|
|
memset(fl6, 0, sizeof(struct flowi6));
|
|
fl6->flowi6_mark = skb->mark;
|
|
|
|
ipv6_addr_copy(&fl6->daddr, reverse ? &hdr->saddr : &hdr->daddr);
|
|
ipv6_addr_copy(&fl6->saddr, reverse ? &hdr->daddr : &hdr->saddr);
|
|
|
|
while (nh + offset + 1 < skb->data ||
|
|
pskb_may_pull(skb, nh + offset + 1 - skb->data)) {
|
|
nh = skb_network_header(skb);
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
|
|
|
switch (nexthdr) {
|
|
case NEXTHDR_FRAGMENT:
|
|
onlyproto = 1;
|
|
case NEXTHDR_ROUTING:
|
|
case NEXTHDR_HOP:
|
|
case NEXTHDR_DEST:
|
|
offset += ipv6_optlen(exthdr);
|
|
nexthdr = exthdr->nexthdr;
|
|
exthdr = (struct ipv6_opt_hdr *)(nh + offset);
|
|
break;
|
|
|
|
case IPPROTO_UDP:
|
|
case IPPROTO_UDPLITE:
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_SCTP:
|
|
case IPPROTO_DCCP:
|
|
if (!onlyproto && (nh + offset + 4 < skb->data ||
|
|
pskb_may_pull(skb, nh + offset + 4 - skb->data))) {
|
|
__be16 *ports = (__be16 *)exthdr;
|
|
|
|
fl6->fl6_sport = ports[!!reverse];
|
|
fl6->fl6_dport = ports[!reverse];
|
|
}
|
|
fl6->flowi6_proto = nexthdr;
|
|
return;
|
|
|
|
case IPPROTO_ICMPV6:
|
|
if (!onlyproto && pskb_may_pull(skb, nh + offset + 2 - skb->data)) {
|
|
u8 *icmp = (u8 *)exthdr;
|
|
|
|
fl6->fl6_icmp_type = icmp[0];
|
|
fl6->fl6_icmp_code = icmp[1];
|
|
}
|
|
fl6->flowi6_proto = nexthdr;
|
|
return;
|
|
|
|
#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
|
|
case IPPROTO_MH:
|
|
if (!onlyproto && pskb_may_pull(skb, nh + offset + 3 - skb->data)) {
|
|
struct ip6_mh *mh;
|
|
mh = (struct ip6_mh *)exthdr;
|
|
|
|
fl6->fl6_mh_type = mh->ip6mh_type;
|
|
}
|
|
fl6->flowi6_proto = nexthdr;
|
|
return;
|
|
#endif
|
|
|
|
/* XXX Why are there these headers? */
|
|
case IPPROTO_AH:
|
|
case IPPROTO_ESP:
|
|
case IPPROTO_COMP:
|
|
default:
|
|
fl6->fl6_ipsec_spi = 0;
|
|
fl6->flowi6_proto = nexthdr;
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
static inline int xfrm6_garbage_collect(struct dst_ops *ops)
|
|
{
|
|
struct net *net = container_of(ops, struct net, xfrm.xfrm6_dst_ops);
|
|
|
|
xfrm6_policy_afinfo.garbage_collect(net);
|
|
return dst_entries_get_fast(ops) > ops->gc_thresh * 2;
|
|
}
|
|
|
|
static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
|
|
{
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
struct dst_entry *path = xdst->route;
|
|
|
|
path->ops->update_pmtu(path, mtu);
|
|
}
|
|
|
|
static void xfrm6_dst_destroy(struct dst_entry *dst)
|
|
{
|
|
struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
|
|
|
|
if (likely(xdst->u.rt6.rt6i_idev))
|
|
in6_dev_put(xdst->u.rt6.rt6i_idev);
|
|
dst_destroy_metrics_generic(dst);
|
|
if (likely(xdst->u.rt6.rt6i_peer))
|
|
inet_putpeer(xdst->u.rt6.rt6i_peer);
|
|
xfrm_dst_destroy(xdst);
|
|
}
|
|
|
|
static void xfrm6_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
|
|
int unregister)
|
|
{
|
|
struct xfrm_dst *xdst;
|
|
|
|
if (!unregister)
|
|
return;
|
|
|
|
xdst = (struct xfrm_dst *)dst;
|
|
if (xdst->u.rt6.rt6i_idev->dev == dev) {
|
|
struct inet6_dev *loopback_idev =
|
|
in6_dev_get(dev_net(dev)->loopback_dev);
|
|
BUG_ON(!loopback_idev);
|
|
|
|
do {
|
|
in6_dev_put(xdst->u.rt6.rt6i_idev);
|
|
xdst->u.rt6.rt6i_idev = loopback_idev;
|
|
in6_dev_hold(loopback_idev);
|
|
xdst = (struct xfrm_dst *)xdst->u.dst.child;
|
|
} while (xdst->u.dst.xfrm);
|
|
|
|
__in6_dev_put(loopback_idev);
|
|
}
|
|
|
|
xfrm_dst_ifdown(dst, dev);
|
|
}
|
|
|
|
static struct dst_ops xfrm6_dst_ops = {
|
|
.family = AF_INET6,
|
|
.protocol = cpu_to_be16(ETH_P_IPV6),
|
|
.gc = xfrm6_garbage_collect,
|
|
.update_pmtu = xfrm6_update_pmtu,
|
|
.cow_metrics = dst_cow_metrics_generic,
|
|
.destroy = xfrm6_dst_destroy,
|
|
.ifdown = xfrm6_dst_ifdown,
|
|
.local_out = __ip6_local_out,
|
|
.gc_thresh = 1024,
|
|
};
|
|
|
|
static struct xfrm_policy_afinfo xfrm6_policy_afinfo = {
|
|
.family = AF_INET6,
|
|
.dst_ops = &xfrm6_dst_ops,
|
|
.dst_lookup = xfrm6_dst_lookup,
|
|
.get_saddr = xfrm6_get_saddr,
|
|
.decode_session = _decode_session6,
|
|
.get_tos = xfrm6_get_tos,
|
|
.init_path = xfrm6_init_path,
|
|
.fill_dst = xfrm6_fill_dst,
|
|
.blackhole_route = ip6_blackhole_route,
|
|
};
|
|
|
|
static int __init xfrm6_policy_init(void)
|
|
{
|
|
return xfrm_policy_register_afinfo(&xfrm6_policy_afinfo);
|
|
}
|
|
|
|
static void xfrm6_policy_fini(void)
|
|
{
|
|
xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo);
|
|
}
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
static struct ctl_table xfrm6_policy_table[] = {
|
|
{
|
|
.procname = "xfrm6_gc_thresh",
|
|
.data = &init_net.xfrm.xfrm6_dst_ops.gc_thresh,
|
|
.maxlen = sizeof(int),
|
|
.mode = 0644,
|
|
.proc_handler = proc_dointvec,
|
|
},
|
|
{ }
|
|
};
|
|
|
|
static struct ctl_table_header *sysctl_hdr;
|
|
#endif
|
|
|
|
int __init xfrm6_init(void)
|
|
{
|
|
int ret;
|
|
unsigned int gc_thresh;
|
|
|
|
/*
|
|
* We need a good default value for the xfrm6 gc threshold.
|
|
* In ipv4 we set it to the route hash table size * 8, which
|
|
* is half the size of the maximaum route cache for ipv4. It
|
|
* would be good to do the same thing for v6, except the table is
|
|
* constructed differently here. Here each table for a net namespace
|
|
* can have FIB_TABLE_HASHSZ entries, so lets go with the same
|
|
* computation that we used for ipv4 here. Also, lets keep the initial
|
|
* gc_thresh to a minimum of 1024, since, the ipv6 route cache defaults
|
|
* to that as a minimum as well
|
|
*/
|
|
gc_thresh = FIB6_TABLE_HASHSZ * 8;
|
|
xfrm6_dst_ops.gc_thresh = (gc_thresh < 1024) ? 1024 : gc_thresh;
|
|
dst_entries_init(&xfrm6_dst_ops);
|
|
|
|
ret = xfrm6_policy_init();
|
|
if (ret) {
|
|
dst_entries_destroy(&xfrm6_dst_ops);
|
|
goto out;
|
|
}
|
|
ret = xfrm6_state_init();
|
|
if (ret)
|
|
goto out_policy;
|
|
|
|
#ifdef CONFIG_SYSCTL
|
|
sysctl_hdr = register_net_sysctl_table(&init_net, net_ipv6_ctl_path,
|
|
xfrm6_policy_table);
|
|
#endif
|
|
out:
|
|
return ret;
|
|
out_policy:
|
|
xfrm6_policy_fini();
|
|
goto out;
|
|
}
|
|
|
|
void xfrm6_fini(void)
|
|
{
|
|
#ifdef CONFIG_SYSCTL
|
|
if (sysctl_hdr)
|
|
unregister_net_sysctl_table(sysctl_hdr);
|
|
#endif
|
|
//xfrm6_input_fini();
|
|
xfrm6_policy_fini();
|
|
xfrm6_state_fini();
|
|
dst_entries_destroy(&xfrm6_dst_ops);
|
|
}
|