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ipv6: Pass fib6_result to ip6_mtu_from_fib6 and fib6_mtu 

Change ip6_mtu_from_fib6 and fib6_mtu to take a fib6_result over a
fib6_info. Update both to use the fib6_nh from fib6_result.

Since the signature of ip6_mtu_from_fib6 is already changing, add const
to daddr and saddr.

Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2019-04-16 14:36:06 -07:00 committed by David S. Miller
parent 5012f0a594
commit b748f26092
5 changed files with 25 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
include/net/ip6_route.h
View File

@ -302,8 +302,9 @@ static inline unsigned int ip6_dst_mtu_forward(const struct dst_entry *dst)
return mtu;
}
u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
struct in6_addr *saddr);
u32 ip6_mtu_from_fib6(const struct fib6_result *res,
const struct in6_addr *daddr,
const struct in6_addr *saddr);
struct neighbour *ip6_neigh_lookup(const struct in6_addr *gw,
struct net_device *dev, struct sk_buff *skb,

5
include/net/ipv6_stubs.h
View File

@ -38,8 +38,9 @@ struct ipv6_stub {
void (*fib6_select_path)(const struct net *net, struct fib6_result *res,
struct flowi6 *fl6, int oif, bool oif_match,
const struct sk_buff *skb, int strict);
u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr,
struct in6_addr *saddr);
u32 (*ip6_mtu_from_fib6)(const struct fib6_result *res,
const struct in6_addr *daddr,
const struct in6_addr *saddr);
int (*fib6_nh_init)(struct net *net, struct fib6_nh *fib6_nh,
struct fib6_config *cfg, gfp_t gfp_flags,

2
net/core/filter.c
View File

@ -4761,7 +4761,7 @@ static int bpf_ipv6_fib_lookup(struct net *net, struct bpf_fib_lookup *params,
fl6.flowi6_oif != 0, NULL, strict);
if (check_mtu) {
mtu = ipv6_stub->ip6_mtu_from_fib6(res.f6i, dst, src);
mtu = ipv6_stub->ip6_mtu_from_fib6(&res, dst, src);
if (params->tot_len > mtu)
return BPF_FIB_LKUP_RET_FRAG_NEEDED;
}

5
net/ipv6/addrconf_core.c
View File

@ -166,8 +166,9 @@ eafnosupport_fib6_select_path(const struct net *net, struct fib6_result *res,
}
static u32
eafnosupport_ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
struct in6_addr *saddr)
eafnosupport_ip6_mtu_from_fib6(const struct fib6_result *res,
const struct in6_addr *daddr,
const struct in6_addr *saddr)
{
return 0;
}

26
net/ipv6/route.c
View File

@ -1417,14 +1417,15 @@ __rt6_find_exception_rcu(struct rt6_exception_bucket **bucket,
return NULL;
}
static unsigned int fib6_mtu(const struct fib6_info *rt)
static unsigned int fib6_mtu(const struct fib6_result *res)
{
const struct fib6_nh *nh = res->nh;
unsigned int mtu;
if (rt->fib6_pmtu) {
mtu = rt->fib6_pmtu;
if (res->f6i->fib6_pmtu) {
mtu = res->f6i->fib6_pmtu;
} else {
struct net_device *dev = fib6_info_nh_dev(rt);
struct net_device *dev = nh->fib_nh_dev;
struct inet6_dev *idev;
rcu_read_lock();
@ -1435,7 +1436,7 @@ static unsigned int fib6_mtu(const struct fib6_info *rt)
mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
return mtu - lwtunnel_headroom(rt->fib6_nh.fib_nh_lws, mtu);
return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
}
static int rt6_insert_exception(struct rt6_info *nrt,
@ -1481,7 +1482,7 @@ static int rt6_insert_exception(struct rt6_info *nrt,
* Only insert this exception route if its mtu
* is less than f6i's mtu value.
*/
if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res->f6i)) {
if (dst_metric_raw(&nrt->dst, RTAX_MTU) >= fib6_mtu(res)) {
err = -EINVAL;
goto out;
}
@ -2640,12 +2641,15 @@ static unsigned int ip6_mtu(const struct dst_entry *dst)
* based on ip6_dst_mtu_forward and exception logic of
* rt6_find_cached_rt; called with rcu_read_lock
*/
u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
struct in6_addr *saddr)
u32 ip6_mtu_from_fib6(const struct fib6_result *res,
const struct in6_addr *daddr,
const struct in6_addr *saddr)
{
struct rt6_exception_bucket *bucket;
const struct fib6_nh *nh = res->nh;
struct fib6_info *f6i = res->f6i;
const struct in6_addr *src_key;
struct rt6_exception *rt6_ex;
struct in6_addr *src_key;
struct inet6_dev *idev;
u32 mtu = 0;
@ -2667,7 +2671,7 @@ u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
mtu = dst_metric_raw(&rt6_ex->rt6i->dst, RTAX_MTU);
if (likely(!mtu)) {
struct net_device *dev = fib6_info_nh_dev(f6i);
struct net_device *dev = nh->fib_nh_dev;
mtu = IPV6_MIN_MTU;
idev = __in6_dev_get(dev);
@ -2677,7 +2681,7 @@ u32 ip6_mtu_from_fib6(struct fib6_info *f6i, struct in6_addr *daddr,
mtu = min_t(unsigned int, mtu, IP6_MAX_MTU);
out:
return mtu - lwtunnel_headroom(fib6_info_nh_lwt(f6i), mtu);
return mtu - lwtunnel_headroom(nh->fib_nh_lws, mtu);
}
struct dst_entry *icmp6_dst_alloc(struct net_device *dev,