ipv6: add support of peer address
This patch adds the support of peer address for IPv6. For example, it is possible to specify the remote end of a 6inY tunnel. This was already possible in IPv4: ip addr add ip1 peer ip2 dev dev1 The peer address is specified with IFA_ADDRESS and the local address with IFA_LOCAL (like explained in include/uapi/linux/if_addr.h). Note that the API is not changed, because before this patch, it was not possible to specify two different addresses in IFA_LOCAL and IFA_REMOTE. There is a small change for the dump: if the peer is different from ::, IFA_ADDRESS will contain the peer address instead of the local address. Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel
David S. Miller
parent
5199dfe531
commit
caeaba7900
2 changed files with 48 additions and 17 deletions
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@ -74,6 +74,7 @@ struct inet6_ifaddr {
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bool tokenized;
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struct rcu_head rcu;
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struct in6_addr peer_addr;
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};
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struct ip6_sf_socklist {
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@ -2402,6 +2402,7 @@ err_exit:
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* Manual configuration of address on an interface
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*/
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static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *pfx,
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const struct in6_addr *peer_pfx,
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unsigned int plen, __u8 ifa_flags, __u32 prefered_lft,
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__u32 valid_lft)
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{
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@ -2457,6 +2458,8 @@ static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *p
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ifp->valid_lft = valid_lft;
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ifp->prefered_lft = prefered_lft;
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ifp->tstamp = jiffies;
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if (peer_pfx)
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ifp->peer_addr = *peer_pfx;
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spin_unlock_bh(&ifp->lock);
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addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
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@ -2526,7 +2529,7 @@ int addrconf_add_ifaddr(struct net *net, void __user *arg)
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return -EFAULT;
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rtnl_lock();
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err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr,
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err = inet6_addr_add(net, ireq.ifr6_ifindex, &ireq.ifr6_addr, NULL,
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ireq.ifr6_prefixlen, IFA_F_PERMANENT,
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INFINITY_LIFE_TIME, INFINITY_LIFE_TIME);
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rtnl_unlock();
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@ -3610,17 +3613,19 @@ restart:
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rcu_read_unlock_bh();
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}
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static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local)
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static struct in6_addr *extract_addr(struct nlattr *addr, struct nlattr *local,
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struct in6_addr **peer_pfx)
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{
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struct in6_addr *pfx = NULL;
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*peer_pfx = NULL;
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if (addr)
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pfx = nla_data(addr);
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if (local) {
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if (pfx && nla_memcmp(local, pfx, sizeof(*pfx)))
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pfx = NULL;
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else
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*peer_pfx = pfx;
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pfx = nla_data(local);
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}
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@ -3639,7 +3644,7 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
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struct net *net = sock_net(skb->sk);
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struct ifaddrmsg *ifm;
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struct nlattr *tb[IFA_MAX+1];
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struct in6_addr *pfx;
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struct in6_addr *pfx, *peer_pfx;
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int err;
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err = nlmsg_parse(nlh, sizeof(*ifm), tb, IFA_MAX, ifa_ipv6_policy);
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@ -3647,7 +3652,7 @@ inet6_rtm_deladdr(struct sk_buff *skb, struct nlmsghdr *nlh)
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return err;
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ifm = nlmsg_data(nlh);
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pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
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pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
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if (pfx == NULL)
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return -EINVAL;
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@ -3705,7 +3710,7 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
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struct net *net = sock_net(skb->sk);
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struct ifaddrmsg *ifm;
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struct nlattr *tb[IFA_MAX+1];
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struct in6_addr *pfx;
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struct in6_addr *pfx, *peer_pfx;
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struct inet6_ifaddr *ifa;
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struct net_device *dev;
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u32 valid_lft = INFINITY_LIFE_TIME, preferred_lft = INFINITY_LIFE_TIME;
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@ -3717,7 +3722,7 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
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return err;
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ifm = nlmsg_data(nlh);
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pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
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pfx = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer_pfx);
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if (pfx == NULL)
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return -EINVAL;
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@ -3745,7 +3750,7 @@ inet6_rtm_newaddr(struct sk_buff *skb, struct nlmsghdr *nlh)
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* It would be best to check for !NLM_F_CREATE here but
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* userspace alreay relies on not having to provide this.
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*/
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return inet6_addr_add(net, ifm->ifa_index, pfx,
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return inet6_addr_add(net, ifm->ifa_index, pfx, peer_pfx,
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ifm->ifa_prefixlen, ifa_flags,
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preferred_lft, valid_lft);
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}
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@ -3802,6 +3807,7 @@ static inline int rt_scope(int ifa_scope)
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static inline int inet6_ifaddr_msgsize(void)
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{
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return NLMSG_ALIGN(sizeof(struct ifaddrmsg))
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+ nla_total_size(16) /* IFA_LOCAL */
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+ nla_total_size(16) /* IFA_ADDRESS */
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+ nla_total_size(sizeof(struct ifa_cacheinfo));
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}
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@ -3840,13 +3846,22 @@ static int inet6_fill_ifaddr(struct sk_buff *skb, struct inet6_ifaddr *ifa,
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valid = INFINITY_LIFE_TIME;
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}
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if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0 ||
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put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0) {
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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if (ipv6_addr_type(&ifa->peer_addr) != IPV6_ADDR_ANY) {
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if (nla_put(skb, IFA_LOCAL, 16, &ifa->addr) < 0 ||
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nla_put(skb, IFA_ADDRESS, 16, &ifa->peer_addr) < 0)
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goto error;
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} else
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if (nla_put(skb, IFA_ADDRESS, 16, &ifa->addr) < 0)
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goto error;
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if (put_cacheinfo(skb, ifa->cstamp, ifa->tstamp, preferred, valid) < 0)
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goto error;
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return nlmsg_end(skb, nlh);
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error:
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nlmsg_cancel(skb, nlh);
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return -EMSGSIZE;
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}
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static int inet6_fill_ifmcaddr(struct sk_buff *skb, struct ifmcaddr6 *ifmca,
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@ -4046,7 +4061,7 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
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struct net *net = sock_net(in_skb->sk);
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struct ifaddrmsg *ifm;
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struct nlattr *tb[IFA_MAX+1];
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struct in6_addr *addr = NULL;
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struct in6_addr *addr = NULL, *peer;
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struct net_device *dev = NULL;
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struct inet6_ifaddr *ifa;
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struct sk_buff *skb;
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@ -4056,7 +4071,7 @@ static int inet6_rtm_getaddr(struct sk_buff *in_skb, struct nlmsghdr *nlh)
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if (err < 0)
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goto errout;
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addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL]);
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addr = extract_addr(tb[IFA_ADDRESS], tb[IFA_LOCAL], &peer);
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if (addr == NULL) {
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err = -EINVAL;
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goto errout;
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@ -4564,11 +4579,26 @@ static void __ipv6_ifa_notify(int event, struct inet6_ifaddr *ifp)
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ip6_ins_rt(ifp->rt);
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if (ifp->idev->cnf.forwarding)
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addrconf_join_anycast(ifp);
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if (ipv6_addr_type(&ifp->peer_addr) != IPV6_ADDR_ANY)
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addrconf_prefix_route(&ifp->peer_addr, 128,
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ifp->idev->dev, 0, 0);
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break;
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case RTM_DELADDR:
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if (ifp->idev->cnf.forwarding)
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addrconf_leave_anycast(ifp);
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addrconf_leave_solict(ifp->idev, &ifp->addr);
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if (ipv6_addr_type(&ifp->peer_addr) != IPV6_ADDR_ANY) {
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struct rt6_info *rt;
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struct net_device *dev = ifp->idev->dev;
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rt = rt6_lookup(dev_net(dev), &ifp->peer_addr, NULL,
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dev->ifindex, 1);
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if (rt) {
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dst_hold(&rt->dst);
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if (ip6_del_rt(rt))
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dst_free(&rt->dst);
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}
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}
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dst_hold(&ifp->rt->dst);
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if (ip6_del_rt(ifp->rt))
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