void ndisc_send_skb(struct sk_buff *skb, struct net_device *dev, struct neighbour *neigh, struct in6_addr *daddr, struct in6_addr *saddr, struct icmp6hdr *icmp6h) { struct flowi fl; struct dst_entry *dst; struct inet6_dev *idev; int err; u8 type; type = icmp6h->icmp6_type; ndisc_flow_init(&fl, icmp6h->icmp6_type, saddr, daddr, dev->ifindex); dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); if (!dst) { kfree_skb(skb); return; } err = xfrm_lookup(&dst, &fl, NULL, 0); if (err < 0) { kfree_skb(skb); return; } skb->dst = dst; idev = in6_dev_get(dst->dev); IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); if (!err) { ICMP6_INC_STATS(idev, type); ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); } if (likely(idev != NULL)) in6_dev_put(idev); }
static void __ndisc_send(struct net_device *dev, struct neighbour *neigh, struct in6_addr *daddr, struct in6_addr *saddr, struct icmp6hdr *icmp6h, struct in6_addr *target, int llinfo, int icmp6_mib_outnd) { struct flowi fl; struct dst_entry *dst; struct sock *sk = ndisc_socket->sk; struct sk_buff *skb; struct icmp6hdr *hdr; struct inet6_dev *idev; int len; int err; u8 *opt; ndisc_flow_init(&fl, icmp6h->icmp6_type, saddr, daddr, dev->ifindex); dst = ndisc_dst_alloc(dev, neigh, daddr, ip6_output); if (!dst) return; err = xfrm_lookup(&dst, &fl, NULL, 0); if (err < 0) return; if (!dev->addr_len) llinfo = 0; len = sizeof(struct icmp6hdr) + (target ? sizeof(*target) : 0); if (llinfo) len += ndisc_opt_addr_space(dev); skb = sock_alloc_send_skb(sk, (MAX_HEADER + sizeof(struct ipv6hdr) + len + LL_RESERVED_SPACE(dev)), 1, &err); if (!skb) { ND_PRINTK0(KERN_ERR "ICMPv6 ND: %s() failed to allocate an skb.\n", __FUNCTION__); dst_release(dst); return; } skb_reserve(skb, LL_RESERVED_SPACE(dev)); ip6_nd_hdr(sk, skb, dev, saddr, daddr, IPPROTO_ICMPV6, len); skb->transport_header = skb->tail; skb_put(skb, len); hdr = (struct icmp6hdr *)skb_transport_header(skb); memcpy(hdr, icmp6h, sizeof(*hdr)); opt = skb_transport_header(skb) + sizeof(struct icmp6hdr); if (target) { ipv6_addr_copy((struct in6_addr *)opt, target); opt += sizeof(*target); } if (llinfo) ndisc_fill_addr_option(opt, llinfo, dev->dev_addr, dev->addr_len, dev->type); hdr->icmp6_cksum = csum_ipv6_magic(saddr, daddr, len, IPPROTO_ICMPV6, csum_partial((__u8 *) hdr, len, 0)); skb->dst = dst; idev = in6_dev_get(dst->dev); IP6_INC_STATS(idev, IPSTATS_MIB_OUTREQUESTS); err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, dst->dev, dst_output); if (!err) { ICMP6_INC_STATS(idev, icmp6_mib_outnd); ICMP6_INC_STATS(idev, ICMP6_MIB_OUTMSGS); } if (likely(idev != NULL)) in6_dev_put(idev); }