ipv6: Update Neighbor Cache when IPv6 RA is received on a router (31ce8c71) · Commits · 戴 / test

When processing a received IPv6 Router Advertisement, the kernel creates or updates an IPv6 Neighbor Cache entry for the sender -- but presently this does not occur if IPv6 forwarding is enabled (net.ipv6.conf.*.forwarding = 1), or if IPv6 Router Advertisements are not accepted (net.ipv6.conf.*.accept_ra = 0), because in these cases processing of the Router Advertisement has already halted. This patch allows the Neighbor Cache to be updated in these cases, while still avoiding any modification to routes or link parameters. This continues to satisfy RFC 4861, since any entry created in the Neighbor Cache as the result of a received Router Advertisement is still placed in the STALE state. Signed-off-by:

David Ward <david.ward@ll.mit.edu> Signed-off-by:

David S. Miller <davem@davemloft.net>

net/ipv6/ndisc.c

+8 −6

Original line number	Diff line number	Diff line
		@@ -1151,10 +1151,6 @@ static void ndisc_router_discovery(struct sk_buff *skb)
		skb->dev->name);
		return;
		}
		if (in6_dev->cnf.forwarding \|\| !in6_dev->cnf.accept_ra) {
		in6_dev_put(in6_dev);
		return;
		}

		if (!ndisc_parse_options(opt, optlen, &ndopts)) {
		in6_dev_put(in6_dev);
		@@ -1163,6 +1159,10 @@ static void ndisc_router_discovery(struct sk_buff *skb)
		return;
		}

		/* skip route and link configuration on routers */
		if (in6_dev->cnf.forwarding \|\| !in6_dev->cnf.accept_ra)
		goto skip_linkparms;

		#ifdef CONFIG_IPV6_NDISC_NODETYPE
		/* skip link-specific parameters from interior routers */
		if (skb->ndisc_nodetype == NDISC_NODETYPE_NODEFAULT)
		@@ -1283,9 +1283,7 @@ skip_defrtr:
		}
		}

		#ifdef CONFIG_IPV6_NDISC_NODETYPE
		skip_linkparms:
		#endif

		/*
		* Process options.
		@@ -1312,6 +1310,10 @@ skip_linkparms:
		NEIGH_UPDATE_F_ISROUTER);
		}

		/* skip route and link configuration on routers */
		if (in6_dev->cnf.forwarding \|\| !in6_dev->cnf.accept_ra)
		goto out;

		#ifdef CONFIG_IPV6_ROUTE_INFO
		if (in6_dev->cnf.accept_ra_rtr_pref && ndopts.nd_opts_ri) {
		struct nd_opt_hdr *p;

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