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); 77