void xfrm_local_error(struct sk_buff *skb, int mtu) { unsigned int proto; struct xfrm_state_afinfo *afinfo; if (skb->protocol == htons(ETH_P_IP)) proto = AF_INET; else if (skb->protocol == htons(ETH_P_IPV6)) proto = AF_INET6; else return; afinfo = xfrm_state_get_afinfo(proto); if (afinfo) { afinfo->local_error(skb, mtu); rcu_read_unlock(); } }
static int __xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int nx, struct flowi *fl, struct dst_entry **dst_p) { struct dst_entry *dst, *dst_prev; struct rtable *rt0 = (struct rtable*)(*dst_p); struct rtable *rt = rt0; struct flowi fl_tunnel = { .nl_u = { .ip4_u = { .saddr = fl->fl4_src, .daddr = fl->fl4_dst, .tos = fl->fl4_tos } } }; int i; int err; int header_len = 0; int trailer_len = 0; dst = dst_prev = NULL; dst_hold(&rt->u.dst); for (i = 0; i < nx; i++) { struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops); struct xfrm_dst *xdst; if (unlikely(dst1 == NULL)) { err = -ENOBUFS; dst_release(&rt->u.dst); goto error; } if (!dst) dst = dst1; else { dst_prev->child = dst1; dst1->flags |= DST_NOHASH; dst_clone(dst1); } xdst = (struct xfrm_dst *)dst1; xdst->route = &rt->u.dst; xdst->genid = xfrm[i]->genid; dst1->next = dst_prev; dst_prev = dst1; header_len += xfrm[i]->props.header_len; trailer_len += xfrm[i]->props.trailer_len; if (xfrm[i]->props.mode == XFRM_MODE_TUNNEL) { unsigned short encap_family = xfrm[i]->props.family; switch(encap_family) { case AF_INET: fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4; fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4; break; #if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE) case AF_INET6: ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr*)&xfrm[i]->id.daddr.a6); ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr*)&xfrm[i]->props.saddr.a6); break; #endif default: BUG_ON(1); } err = xfrm_dst_lookup((struct xfrm_dst **)&rt, &fl_tunnel, encap_family); if (err) goto error; } else dst_hold(&rt->u.dst); } dst_prev->child = &rt->u.dst; dst->path = &rt->u.dst; *dst_p = dst; dst = dst_prev; dst_prev = *dst_p; i = 0; for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) { struct xfrm_dst *x = (struct xfrm_dst*)dst_prev; struct xfrm_state_afinfo *afinfo; x->u.rt.fl = *fl; dst_prev->xfrm = xfrm[i++]; dst_prev->dev = rt->u.dst.dev; if (rt->u.dst.dev) dev_hold(rt->u.dst.dev); dst_prev->obsolete = -1; dst_prev->flags |= DST_HOST; dst_prev->lastuse = jiffies; dst_prev->header_len = header_len; dst_prev->nfheader_len = 0; dst_prev->trailer_len = trailer_len; memcpy(&dst_prev->metrics, &x->route->metrics, sizeof(dst_prev->metrics)); /* Copy neighbout for reachability confirmation */ dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour); dst_prev->input = rt->u.dst.input; /* XXX: When IPv6 module can be unloaded, we should manage reference * to xfrm6_output in afinfo->output. Miyazawa * */ afinfo = xfrm_state_get_afinfo(dst_prev->xfrm->props.family); if (!afinfo) { dst = *dst_p; err = -EAFNOSUPPORT; goto error; } dst_prev->output = afinfo->output; xfrm_state_put_afinfo(afinfo); if (dst_prev->xfrm->props.family == AF_INET && rt->peer) atomic_inc(&rt->peer->refcnt); x->u.rt.peer = rt->peer; /* Sheit... I remember I did this right. Apparently, * it was magically lost, so this code needs audit */ x->u.rt.rt_flags = rt0->rt_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL); x->u.rt.rt_type = rt->rt_type; x->u.rt.rt_src = rt0->rt_src; x->u.rt.rt_dst = rt0->rt_dst; x->u.rt.rt_gateway = rt->rt_gateway; x->u.rt.rt_spec_dst = rt0->rt_spec_dst; x->u.rt.idev = rt0->idev; in_dev_hold(rt0->idev); header_len -= x->u.dst.xfrm->props.header_len; trailer_len -= x->u.dst.xfrm->props.trailer_len; } xfrm_init_pmtu(dst); return 0; error: if (dst) dst_free(dst); return err; }