static int dn_route_rx_long(struct sk_buff *skb) { struct dn_skb_cb *cb = DN_SKB_CB(skb); unsigned char *ptr = skb->data; if (!pskb_may_pull(skb, 21)) /* 20 for long header, 1 for shortest nsp */ goto drop_it; skb_pull(skb, 20); skb->h.raw = skb->data; /* Destination info */ ptr += 2; cb->dst = dn_eth2dn(ptr); if (memcmp(ptr, dn_hiord_addr, 4) != 0) goto drop_it; ptr += 6; /* Source info */ ptr += 2; cb->src = dn_eth2dn(ptr); if (memcmp(ptr, dn_hiord_addr, 4) != 0) goto drop_it; ptr += 6; /* Other junk */ ptr++; cb->hops = *ptr++; /* Visit Count */ return NF_HOOK(PF_DECnet, NF_DN_PRE_ROUTING, skb, skb->dev, NULL, dn_route_rx_packet); drop_it: kfree_skb(skb); return NET_RX_DROP; }
/* * Endnode hello message received */ int dn_neigh_endnode_hello(struct sk_buff *skb) { struct endnode_hello_message *msg = (struct endnode_hello_message *)skb->data; struct neighbour *neigh; struct dn_neigh *dn; dn_address src; src = dn_htons(dn_eth2dn(msg->id)); neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); dn = (struct dn_neigh *)neigh; if (neigh) { write_lock(&neigh->lock); neigh->used = jiffies; if (!(neigh->nud_state & NUD_PERMANENT)) { neigh->updated = jiffies; if (neigh->dev->type == ARPHRD_ETHER) memcpy(neigh->ha, &skb->mac.ethernet->h_source, ETH_ALEN); dn->flags &= ~(DN_NDFLAG_R1 | DN_NDFLAG_R2); dn->blksize = dn_ntohs(msg->blksize); dn->priority = 0; } write_unlock(&neigh->lock); neigh_release(neigh); } kfree_skb(skb); return 0; }
/* * Ethernet router hello message received */ int dn_neigh_router_hello(struct sk_buff *skb) { struct rtnode_hello_message *msg = (struct rtnode_hello_message *)skb->data; struct neighbour *neigh; struct dn_neigh *dn; struct dn_dev *dn_db; dn_address src; src = dn_htons(dn_eth2dn(msg->id)); neigh = __neigh_lookup(&dn_neigh_table, &src, skb->dev, 1); dn = (struct dn_neigh *)neigh; if (neigh) { write_lock(&neigh->lock); neigh->used = jiffies; dn_db = (struct dn_dev *)neigh->dev->dn_ptr; if (!(neigh->nud_state & NUD_PERMANENT)) { neigh->updated = jiffies; if (neigh->dev->type == ARPHRD_ETHER) memcpy(neigh->ha, &skb->mac.ethernet->h_source, ETH_ALEN); dn->blksize = dn_ntohs(msg->blksize); dn->priority = msg->priority; dn->flags &= ~DN_NDFLAG_P3; switch(msg->iinfo & DN_RT_INFO_TYPE) { case DN_RT_INFO_L1RT: dn->flags &=~DN_NDFLAG_R2; dn->flags |= DN_NDFLAG_R1; break; case DN_RT_INFO_L2RT: dn->flags |= DN_NDFLAG_R2; } } if (!dn_db->router) { dn_db->router = neigh_clone(neigh); } else { if (msg->priority > ((struct dn_neigh *)dn_db->router)->priority) neigh_release(xchg(&dn_db->router, neigh_clone(neigh))); } write_unlock(&neigh->lock); neigh_release(neigh); } kfree_skb(skb); return 0; }