129 lines
2.8 KiB
C
129 lines
2.8 KiB
C
/*
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* IPv6 library code, needed by static components when full IPv6 support is
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* not configured or static. These functions are needed by GSO/GRO implementation.
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*/
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#include <linux/export.h>
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#include <net/ipv6.h>
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#include <net/ip6_fib.h>
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#include <net/addrconf.h>
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#include <net/secure_seq.h>
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void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt)
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{
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static atomic_t ipv6_fragmentation_id;
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struct in6_addr addr;
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int old, new;
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#if IS_ENABLED(CONFIG_IPV6)
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struct inet_peer *peer;
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struct net *net;
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net = dev_net(rt->dst.dev);
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peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1);
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if (peer) {
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fhdr->identification = htonl(inet_getid(peer, 0));
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inet_putpeer(peer);
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return;
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}
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#endif
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do {
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old = atomic_read(&ipv6_fragmentation_id);
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new = old + 1;
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if (!new)
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new = 1;
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} while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old);
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addr = rt->rt6i_dst.addr;
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addr.s6_addr32[0] ^= (__force __be32)new;
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fhdr->identification = htonl(secure_ipv6_id(addr.s6_addr32));
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}
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EXPORT_SYMBOL(ipv6_select_ident);
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int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr)
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{
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u16 offset = sizeof(struct ipv6hdr);
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struct ipv6_opt_hdr *exthdr =
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(struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1);
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unsigned int packet_len = skb_tail_pointer(skb) -
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skb_network_header(skb);
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int found_rhdr = 0;
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*nexthdr = &ipv6_hdr(skb)->nexthdr;
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while (offset + 1 <= packet_len) {
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switch (**nexthdr) {
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case NEXTHDR_HOP:
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break;
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case NEXTHDR_ROUTING:
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found_rhdr = 1;
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break;
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case NEXTHDR_DEST:
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#if IS_ENABLED(CONFIG_IPV6_MIP6)
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if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0)
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break;
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#endif
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if (found_rhdr)
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return offset;
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break;
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default :
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return offset;
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}
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offset += ipv6_optlen(exthdr);
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*nexthdr = &exthdr->nexthdr;
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exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) +
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offset);
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}
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return offset;
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}
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EXPORT_SYMBOL(ip6_find_1stfragopt);
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#if IS_ENABLED(CONFIG_IPV6)
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int ip6_dst_hoplimit(struct dst_entry *dst)
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{
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int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
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if (hoplimit == 0) {
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struct net_device *dev = dst->dev;
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struct inet6_dev *idev;
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rcu_read_lock();
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idev = __in6_dev_get(dev);
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if (idev)
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hoplimit = idev->cnf.hop_limit;
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else
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hoplimit = dev_net(dev)->ipv6.devconf_all->hop_limit;
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rcu_read_unlock();
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}
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return hoplimit;
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}
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EXPORT_SYMBOL(ip6_dst_hoplimit);
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#endif
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int __ip6_local_out(struct sk_buff *skb)
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{
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int len;
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len = skb->len - sizeof(struct ipv6hdr);
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if (len > IPV6_MAXPLEN)
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len = 0;
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ipv6_hdr(skb)->payload_len = htons(len);
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return nf_hook(NFPROTO_IPV6, NF_INET_LOCAL_OUT, skb, NULL,
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skb_dst(skb)->dev, dst_output);
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}
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EXPORT_SYMBOL_GPL(__ip6_local_out);
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int ip6_local_out(struct sk_buff *skb)
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{
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int err;
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err = __ip6_local_out(skb);
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if (likely(err == 1))
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err = dst_output(skb);
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return err;
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}
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EXPORT_SYMBOL_GPL(ip6_local_out);
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