29a3cad5c6
This corrects an regression introduced by "net: Use 16bits for *_headers fields of struct skbuff" when NET_SKBUFF_DATA_USES_OFFSET is not set. In that case skb->tail will be a pointer whereas skb->transport_header will be an offset from head. This is corrected by using wrappers that ensure that comparisons and calculations are always made using pointers. Signed-off-by: Simon Horman <horms@verge.net.au> Signed-off-by: David S. Miller <davem@davemloft.net>
77 lines
1.8 KiB
C
77 lines
1.8 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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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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int old, new;
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#if IS_ENABLED(CONFIG_IPV6)
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if (rt && !(rt->dst.flags & DST_NOPEER)) {
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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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}
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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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fhdr->identification = htonl(new);
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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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