mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-19 02:04:19 +08:00
3ce9b35ff6
It will be used by vxlan, and may not be inlined. Cc: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: Cong Wang <amwang@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/*
|
|
* IPv6 library code, needed by static components when full IPv6 support is
|
|
* not configured or static. These functions are needed by GSO/GRO implementation.
|
|
*/
|
|
#include <linux/export.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ip6_fib.h>
|
|
#include <net/addrconf.h>
|
|
|
|
void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
|
|
{
|
|
static atomic_t ipv6_fragmentation_id;
|
|
int old, new;
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (rt && !(rt->dst.flags & DST_NOPEER)) {
|
|
struct inet_peer *peer;
|
|
struct net *net;
|
|
|
|
net = dev_net(rt->dst.dev);
|
|
peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
|
|
if (peer) {
|
|
fhdr->identification = htonl(inet_getid(peer, 0));
|
|
inet_putpeer(peer);
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
do {
|
|
old = atomic_read(&ipv6_fragmentation_id);
|
|
new = old + 1;
|
|
if (!new)
|
|
new = 1;
|
|
} while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old);
|
|
fhdr->identification = htonl(new);
|
|
}
|
|
EXPORT_SYMBOL(ipv6_select_ident);
|
|
|
|
int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
|
|
{
|
|
u16 offset = sizeof(struct ipv6hdr);
|
|
struct ipv6_opt_hdr *exthdr =
|
|
(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
|
|
unsigned int packet_len = skb_tail_pointer(skb) -
|
|
skb_network_header(skb);
|
|
int found_rhdr = 0;
|
|
*nexthdr = &ipv6_hdr(skb)->nexthdr;
|
|
|
|
while (offset + 1 <= packet_len) {
|
|
|
|
switch (**nexthdr) {
|
|
|
|
case NEXTHDR_HOP:
|
|
break;
|
|
case NEXTHDR_ROUTING:
|
|
found_rhdr = 1;
|
|
break;
|
|
case NEXTHDR_DEST:
|
|
#if IS_ENABLED(CONFIG_IPV6_MIP6)
|
|
if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
|
|
break;
|
|
#endif
|
|
if (found_rhdr)
|
|
return offset;
|
|
break;
|
|
default :
|
|
return offset;
|
|
}
|
|
|
|
offset += ipv6_optlen(exthdr);
|
|
*nexthdr = &exthdr->nexthdr;
|
|
exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
|
|
offset);
|
|
}
|
|
|
|
return offset;
|
|
}
|
|
EXPORT_SYMBOL(ip6_find_1stfragopt);
|
|
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
int ip6_dst_hoplimit(struct dst_entry *dst)
|
|
{
|
|
int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
|
|
if (hoplimit == 0) {
|
|
struct net_device *dev = dst->dev;
|
|
struct inet6_dev *idev;
|
|
|
|
rcu_read_lock();
|
|
idev = __in6_dev_get(dev);
|
|
if (idev)
|
|
hoplimit = idev->cnf.hop_limit;
|
|
else
|
|
hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
|
|
rcu_read_unlock();
|
|
}
|
|
return hoplimit;
|
|
}
|
|
EXPORT_SYMBOL(ip6_dst_hoplimit);
|
|
#endif
|