From 7cbca67c073263c179f605bdbbdc565ab29d801d Mon Sep 17 00:00:00 2001 From: YOSHIFUJI Hideaki Date: Tue, 25 Mar 2008 09:37:42 +0900 Subject: [PATCH] [IPV6]: Support Source Address Selection API (RFC5014). Signed-off-by: YOSHIFUJI Hideaki --- include/linux/in6.h | 11 ++++++ include/linux/ipv6.h | 6 +++- include/net/addrconf.h | 1 + include/net/ip6_route.h | 9 +++-- net/ipv6/addrconf.c | 17 +++++++-- net/ipv6/fib6_rules.c | 12 ++++++- net/ipv6/ip6_output.c | 4 ++- net/ipv6/ipv6_sockglue.c | 78 ++++++++++++++++++++++++++++++++++++++++ net/ipv6/ndisc.c | 4 ++- net/ipv6/route.c | 11 +++++- net/ipv6/xfrm6_policy.c | 2 +- net/sctp/ipv6.c | 4 ++- 12 files changed, 146 insertions(+), 13 deletions(-) diff --git a/include/linux/in6.h b/include/linux/in6.h index 2a61c82af115..f674000c6c99 100644 --- a/include/linux/in6.h +++ b/include/linux/in6.h @@ -249,4 +249,15 @@ struct in6_flowlabel_req * IP6T_SO_GET_REVISION_TARGET 69 */ +/* RFC5014: Source address selection */ +#define IPV6_ADDR_PREFERENCES 72 + +#define IPV6_PREFER_SRC_TMP 0x0001 +#define IPV6_PREFER_SRC_PUBLIC 0x0002 +#define IPV6_PREFER_SRC_PUBTMP_DEFAULT 0x0100 +#define IPV6_PREFER_SRC_COA 0x0004 +#define IPV6_PREFER_SRC_HOME 0x0400 +#define IPV6_PREFER_SRC_CGA 0x0008 +#define IPV6_PREFER_SRC_NONCGA 0x0800 + #endif diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h index 87ae4e389ce1..c9ba0da16ce9 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -322,7 +322,11 @@ struct ipv6_pinfo { __u8 recverr:1, sndflow:1, pmtudisc:2, - ipv6only:1; + ipv6only:1, + srcprefs:3; /* 001: prefer temporary address + * 010: prefer public address + * 100: prefer care-of address + */ __u8 tclass; __u32 dst_cookie; diff --git a/include/net/addrconf.h b/include/net/addrconf.h index edcb4bbaab7d..c9276c72764d 100644 --- a/include/net/addrconf.h +++ b/include/net/addrconf.h @@ -78,6 +78,7 @@ extern struct inet6_ifaddr *ipv6_get_ifaddr(struct net *net, extern int ipv6_dev_get_saddr(struct net_device *dev, struct in6_addr *daddr, + unsigned int srcprefs, struct in6_addr *saddr); extern int ipv6_get_lladdr(struct net_device *dev, struct in6_addr *addr, diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index 5c3b67c86aef..3ae6799c2b14 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -30,9 +30,12 @@ struct route_info { #include #include -#define RT6_LOOKUP_F_IFACE 0x1 -#define RT6_LOOKUP_F_REACHABLE 0x2 -#define RT6_LOOKUP_F_HAS_SADDR 0x4 +#define RT6_LOOKUP_F_IFACE 0x00000001 +#define RT6_LOOKUP_F_REACHABLE 0x00000002 +#define RT6_LOOKUP_F_HAS_SADDR 0x00000004 +#define RT6_LOOKUP_F_SRCPREF_TMP 0x00000008 +#define RT6_LOOKUP_F_SRCPREF_PUBLIC 0x00000010 +#define RT6_LOOKUP_F_SRCPREF_COA 0x00000020 extern struct rt6_info *ip6_null_entry; diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 787e90af166c..89954885dee1 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -909,6 +909,7 @@ struct ipv6_saddr_dst { int ifindex; int scope; int label; + unsigned int prefs; }; static inline int ipv6_saddr_preferred(int type) @@ -984,9 +985,12 @@ static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score, break; #ifdef CONFIG_IPV6_MIP6 case IPV6_SADDR_RULE_HOA: + { /* Rule 4: Prefer home address */ - ret = !!(score->ifa->flags & IFA_F_HOMEADDRESS); + int prefhome = !(dst->prefs & IPV6_PREFER_SRC_COA); + ret = !(score->ifa->flags & IFA_F_HOMEADDRESS) ^ prefhome; break; + } #endif case IPV6_SADDR_RULE_OIF: /* Rule 5: Prefer outgoing interface */ @@ -1000,11 +1004,16 @@ static int ipv6_get_saddr_eval(struct ipv6_saddr_score *score, break; #ifdef CONFIG_IPV6_PRIVACY case IPV6_SADDR_RULE_PRIVACY: + { /* Rule 7: Prefer public address * Note: prefer temprary address if use_tempaddr >= 2 */ - ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ (score->ifa->idev->cnf.use_tempaddr >= 2); + int preftmp = dst->prefs & (IPV6_PREFER_SRC_PUBLIC|IPV6_PREFER_SRC_TMP) ? + !!(dst->prefs & IPV6_PREFER_SRC_TMP) : + score->ifa->idev->cnf.use_tempaddr >= 2; + ret = (!(score->ifa->flags & IFA_F_TEMPORARY)) ^ preftmp; break; + } #endif case IPV6_SADDR_RULE_ORCHID: /* Rule 8-: Prefer ORCHID vs ORCHID or @@ -1030,7 +1039,8 @@ out: } int ipv6_dev_get_saddr(struct net_device *dst_dev, - struct in6_addr *daddr, struct in6_addr *saddr) + struct in6_addr *daddr, unsigned int prefs, + struct in6_addr *saddr) { struct ipv6_saddr_score scores[2], *score = &scores[0], *hiscore = &scores[1]; @@ -1044,6 +1054,7 @@ int ipv6_dev_get_saddr(struct net_device *dst_dev, dst.ifindex = dst_dev ? dst_dev->ifindex : 0; dst.scope = __ipv6_addr_src_scope(dst_type); dst.label = ipv6_addr_label(daddr, dst_type, dst.ifindex); + dst.prefs = prefs; hiscore->rule = -1; hiscore->ifa = NULL; diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c index 55137408f054..e7a7fe26cebf 100644 --- a/net/ipv6/fib6_rules.c +++ b/net/ipv6/fib6_rules.c @@ -84,8 +84,18 @@ static int fib6_rule_action(struct fib_rule *rule, struct flowi *flp, if ((rule->flags & FIB_RULE_FIND_SADDR) && r->src.plen && !(flags & RT6_LOOKUP_F_HAS_SADDR)) { struct in6_addr saddr; + unsigned int srcprefs = 0; + + if (flags & RT6_LOOKUP_F_SRCPREF_TMP) + srcprefs |= IPV6_PREFER_SRC_TMP; + if (flags & RT6_LOOKUP_F_SRCPREF_PUBLIC) + srcprefs |= IPV6_PREFER_SRC_PUBLIC; + if (flags & RT6_LOOKUP_F_SRCPREF_COA) + srcprefs |= IPV6_PREFER_SRC_COA; + if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, - &flp->fl6_dst, &saddr)) + &flp->fl6_dst, srcprefs, + &saddr)) goto again; if (!ipv6_prefix_equal(&saddr, &r->src.addr, r->src.plen)) diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 2a4f08c8a02d..d34aa61353bb 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -920,7 +920,9 @@ static int ip6_dst_lookup_tail(struct sock *sk, if (ipv6_addr_any(&fl->fl6_src)) { err = ipv6_dev_get_saddr(ip6_dst_idev(*dst)->dev, - &fl->fl6_dst, &fl->fl6_src); + &fl->fl6_dst, + sk ? inet6_sk(sk)->srcprefs : 0, + &fl->fl6_src); if (err) goto out_err_release; } diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index 8e29fb1d1df6..dc6695cc5767 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -617,7 +617,67 @@ done: retv = xfrm_user_policy(sk, optname, optval, optlen); break; + case IPV6_ADDR_PREFERENCES: + { + unsigned int pref = 0; + unsigned int prefmask = ~0; + + retv = -EINVAL; + + /* check PUBLIC/TMP/PUBTMP_DEFAULT conflicts */ + switch (val & (IPV6_PREFER_SRC_PUBLIC| + IPV6_PREFER_SRC_TMP| + IPV6_PREFER_SRC_PUBTMP_DEFAULT)) { + case IPV6_PREFER_SRC_PUBLIC: + pref |= IPV6_PREFER_SRC_PUBLIC; + break; + case IPV6_PREFER_SRC_TMP: + pref |= IPV6_PREFER_SRC_TMP; + break; + case IPV6_PREFER_SRC_PUBTMP_DEFAULT: + break; + case 0: + goto pref_skip_pubtmp; + default: + goto e_inval; + } + + prefmask &= ~(IPV6_PREFER_SRC_PUBLIC| + IPV6_PREFER_SRC_TMP); +pref_skip_pubtmp: + + /* check HOME/COA conflicts */ + switch (val & (IPV6_PREFER_SRC_HOME|IPV6_PREFER_SRC_COA)) { + case IPV6_PREFER_SRC_HOME: + break; + case IPV6_PREFER_SRC_COA: + pref |= IPV6_PREFER_SRC_COA; + case 0: + goto pref_skip_coa; + default: + goto e_inval; + } + + prefmask &= ~IPV6_PREFER_SRC_COA; +pref_skip_coa: + + /* check CGA/NONCGA conflicts */ + switch (val & (IPV6_PREFER_SRC_CGA|IPV6_PREFER_SRC_NONCGA)) { + case IPV6_PREFER_SRC_CGA: + case IPV6_PREFER_SRC_NONCGA: + case 0: + break; + default: + goto e_inval; + } + + np->srcprefs = (np->srcprefs & prefmask) | pref; + retv = 0; + + break; + } } + release_sock(sk); return retv; @@ -932,6 +992,24 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, val = np->sndflow; break; + case IPV6_ADDR_PREFERENCES: + val = 0; + + if (np->srcprefs & IPV6_PREFER_SRC_TMP) + val |= IPV6_PREFER_SRC_TMP; + else if (np->srcprefs & IPV6_PREFER_SRC_PUBLIC) + val |= IPV6_PREFER_SRC_PUBLIC; + else { + /* XXX: should we return system default? */ + val |= IPV6_PREFER_SRC_PUBTMP_DEFAULT; + } + + if (np->srcprefs & IPV6_PREFER_SRC_COA) + val |= IPV6_PREFER_SRC_COA; + else + val |= IPV6_PREFER_SRC_HOME; + break; + default: return -ENOPROTOOPT; } diff --git a/net/ipv6/ndisc.c b/net/ipv6/ndisc.c index e7d8e74704c1..3f68a6eae7b2 100644 --- a/net/ipv6/ndisc.c +++ b/net/ipv6/ndisc.c @@ -546,7 +546,9 @@ static void ndisc_send_na(struct net_device *dev, struct neighbour *neigh, override = 0; in6_ifa_put(ifp); } else { - if (ipv6_dev_get_saddr(dev, daddr, &tmpaddr)) + if (ipv6_dev_get_saddr(dev, daddr, + inet6_sk(dev->nd_net->ipv6.ndisc_sk)->srcprefs, + &tmpaddr)) return; src_addr = &tmpaddr; } diff --git a/net/ipv6/route.c b/net/ipv6/route.c index aa3f08718e44..06faa46920e1 100644 --- a/net/ipv6/route.c +++ b/net/ipv6/route.c @@ -782,6 +782,15 @@ struct dst_entry * ip6_route_output(struct net *net, struct sock *sk, if (!ipv6_addr_any(&fl->fl6_src)) flags |= RT6_LOOKUP_F_HAS_SADDR; + else if (sk) { + unsigned int prefs = inet6_sk(sk)->srcprefs; + if (prefs & IPV6_PREFER_SRC_TMP) + flags |= RT6_LOOKUP_F_SRCPREF_TMP; + if (prefs & IPV6_PREFER_SRC_PUBLIC) + flags |= RT6_LOOKUP_F_SRCPREF_PUBLIC; + if (prefs & IPV6_PREFER_SRC_COA) + flags |= RT6_LOOKUP_F_SRCPREF_COA; + } return fib6_rule_lookup(net, fl, flags, ip6_pol_route_output); } @@ -2162,7 +2171,7 @@ static int rt6_fill_node(struct sk_buff *skb, struct rt6_info *rt, else if (dst) { struct in6_addr saddr_buf; if (ipv6_dev_get_saddr(ip6_dst_idev(&rt->u.dst)->dev, - dst, &saddr_buf) == 0) + dst, 0, &saddr_buf) == 0) NLA_PUT(skb, RTA_PREFSRC, 16, &saddr_buf); } diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c index e96dafdc7032..d92d1fceb8cf 100644 --- a/net/ipv6/xfrm6_policy.c +++ b/net/ipv6/xfrm6_policy.c @@ -58,7 +58,7 @@ static int xfrm6_get_saddr(xfrm_address_t *saddr, xfrm_address_t *daddr) return -EHOSTUNREACH; ipv6_dev_get_saddr(ip6_dst_idev(dst)->dev, - (struct in6_addr *)&daddr->a6, + (struct in6_addr *)&daddr->a6, 0, (struct in6_addr *)&saddr->a6); dst_release(dst); return 0; diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index 46c5b3c5cb99..dc71d0d83753 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -316,7 +316,9 @@ static void sctp_v6_get_saddr(struct sctp_association *asoc, if (!asoc) { ipv6_dev_get_saddr(dst ? ip6_dst_idev(dst)->dev : NULL, - &daddr->v6.sin6_addr, &saddr->v6.sin6_addr); + &daddr->v6.sin6_addr, + inet6_sk(asoc->base.sk)->srcprefs, + &saddr->v6.sin6_addr); SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n", NIP6(saddr->v6.sin6_addr)); return; -- 2.20.1