addrconf: add functionality to check on rpl requirements (f37c6059) · Commits · 戴 / test

include/net/addrconf.h

+3 −0

Original line number	Diff line number	Diff line
		@@ -90,6 +90,9 @@ int ipv6_chk_addr_and_flags(struct net net, const struct in6_addr addr,
		int ipv6_chk_home_addr(struct net net, const struct in6_addr addr);
		#endif

		int ipv6_chk_rpl_srh_loop(struct net net, const struct in6_addr segs,
		unsigned char nsegs);

		bool ipv6_chk_custom_prefix(const struct in6_addr *addr,
		const unsigned int prefix_len,
		struct net_device *dev);

+53 −0

Original line number	Diff line number	Diff line
		@@ -4398,6 +4398,59 @@ int ipv6_chk_home_addr(struct net net, const struct in6_addr addr)
		}
		#endif

		/* RFC6554 has some algorithm to avoid loops in segment routing by
		* checking if the segments contains any of a local interface address.
		*
		* Quote:
		*
		* To detect loops in the SRH, a router MUST determine if the SRH
		* includes multiple addresses assigned to any interface on that router.
		* If such addresses appear more than once and are separated by at least
		* one address not assigned to that router.
		*/
		int ipv6_chk_rpl_srh_loop(struct net net, const struct in6_addr segs,
		unsigned char nsegs)
		{
		const struct in6_addr *addr;
		int i, ret = 0, found = 0;
		struct inet6_ifaddr *ifp;
		bool separated = false;
		unsigned int hash;
		bool hash_found;

		rcu_read_lock();
		for (i = 0; i < nsegs; i++) {
		addr = &segs[i];
		hash = inet6_addr_hash(net, addr);

		hash_found = false;
		hlist_for_each_entry_rcu(ifp, &inet6_addr_lst[hash], addr_lst) {
		if (!net_eq(dev_net(ifp->idev->dev), net))
		continue;

		if (ipv6_addr_equal(&ifp->addr, addr)) {
		hash_found = true;
		break;
		}
		}

		if (hash_found) {
		if (found > 1 && separated) {
		ret = 1;
		break;
		}

		separated = false;
		found++;
		} else {
		separated = true;
		}
		}
		rcu_read_unlock();

		return ret;
		}

		/*
		* Periodic address status verification
		*/