projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 3c73a036 VY |
1 | /* |
| 2 | * IPv6 library code, needed by static components when full IPv6 support is | |
| 3 | * not configured or static. These functions are needed by GSO/GRO implementation. | |
| 4 | */ | |
| 5 | #include <linux/export.h> | |
| 6 | #include <net/ipv6.h> | |
| 7 | #include <net/ip6_fib.h> | |
| 8 | ||
| 9 | void ipv6_select_ident(struct frag_hdr *fhdr, struct rt6_info *rt) | |
| 10 | { | |
| 11 | static atomic_t ipv6_fragmentation_id; | |
| 12 | int old, new; | |
| 13 | ||
| 14 | #if IS_ENABLED(CONFIG_IPV6) | |
| 15 | if (rt && !(rt->dst.flags & DST_NOPEER)) { | |
| 16 | struct inet_peer *peer; | |
| 17 | struct net *net; | |
| 18 | ||
| 19 | net = dev_net(rt->dst.dev); | |
| 20 | peer = inet_getpeer_v6(net->ipv6.peers, &rt->rt6i_dst.addr, 1); | |
| 21 | if (peer) { | |
| 22 | fhdr->identification = htonl(inet_getid(peer, 0)); | |
| 23 | inet_putpeer(peer); | |
| 24 | return; | |
| 25 | } | |
| 26 | } | |
| 27 | #endif | |
| 28 | do { | |
| 29 | old = atomic_read(&ipv6_fragmentation_id); | |
| 30 | new = old + 1; | |
| 31 | if (!new) | |
| 32 | new = 1; | |
| 33 | } while (atomic_cmpxchg(&ipv6_fragmentation_id, old, new) != old); | |
| 34 | fhdr->identification = htonl(new); | |
| 35 | } | |
| 36 | EXPORT_SYMBOL(ipv6_select_ident); | |
| 37 | ||
| 38 | int ip6_find_1stfragopt(struct sk_buff *skb, u8 **nexthdr) | |
| 39 | { | |
| 40 | u16 offset = sizeof(struct ipv6hdr); | |
| 41 | struct ipv6_opt_hdr *exthdr = | |
| 42 | (struct ipv6_opt_hdr *)(ipv6_hdr(skb) + 1); | |
| 43 | unsigned int packet_len = skb->tail - skb->network_header; | |
| 44 | int found_rhdr = 0; | |
| 45 | *nexthdr = &ipv6_hdr(skb)->nexthdr; | |
| 46 | ||
| 47 | while (offset + 1 <= packet_len) { | |
| 48 | ||
| 49 | switch (**nexthdr) { | |
| 50 | ||
| 51 | case NEXTHDR_HOP: | |
| 52 | break; | |
| 53 | case NEXTHDR_ROUTING: | |
| 54 | found_rhdr = 1; | |
| 55 | break; | |
| 56 | case NEXTHDR_DEST: | |
| 57 | #if IS_ENABLED(CONFIG_IPV6_MIP6) | |
| 58 | if (ipv6_find_tlv(skb, offset, IPV6_TLV_HAO) >= 0) | |
| 59 | break; | |
| 60 | #endif | |
| 61 | if (found_rhdr) | |
| 62 | return offset; | |
| 63 | break; | |
| 64 | default : | |
| 65 | return offset; | |
| 66 | } | |
| 67 | ||
| 68 | offset += ipv6_optlen(exthdr); | |
| 69 | *nexthdr = &exthdr->nexthdr; | |
| 70 | exthdr = (struct ipv6_opt_hdr *)(skb_network_header(skb) + | |
| 71 | offset); | |
| 72 | } | |
| 73 | ||
| 74 | return offset; | |
| 75 | } | |
| 76 | EXPORT_SYMBOL(ip6_find_1stfragopt); |