From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnaud Ebalard Subject: [PATCHv3 net-next-2.6 2/5] XFRM,IPv6: Introduce receive sockopts to access IRO remapped src/dst addresses Date: Wed, 29 Sep 2010 11:05:41 +0200 Message-ID: <6a4082ab12d691c521c3558ec0b51b48a60b42d8.1285749610.git.arno@natisbad.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: netdev@vger.kernel.org To: "David S. Miller" , Eric Dumazet , Herbert Xu , Hideaki YOSHIFUJI Return-path: Received: from copper.chdir.org ([88.191.97.87]:38525 "EHLO copper.chdir.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754157Ab0I2JEp (ORCPT ); Wed, 29 Sep 2010 05:04:45 -0400 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: This patch introduces IRO recv sockopts, in order for userland processes (e.g. UMIP) to access on-wire source or destination addresses found in incoming (IPsec-protected) packets as they were before remapping by IRO. The socket options are respectively IPV6_RECVIROSRC and IPV6_RECVIRODST. Basically, the two recv socket options are similar in their purpose to their generic RH2/HAO counterparts defined in RFC 3542 (IPV6_RECVIROSRC <-> IPV6_RECVDSTOPTS, IPV6_RECVIRODST <-> IPV6_RECVRTHDR). They differ on the following aspects: - IRO reporting sockopts only work on incoming IPsec-protected packets Userspace will never get IRO remapped address report for common (non protected) packets. - The receiver gets the original source/desination address (IRO remapping) from its IPsec stack. - as IRO sockopts only deal with addresses, no specific structure is defined, i.e. struct in6_addr is used to pass info. As we only interact with IPsec protected packets, struct sec_path is used to carry information (addresses) for incoming packets that have undergone remapping process. Signed-off-by: Arnaud Ebalard --- include/linux/in6.h | 7 +++++++ include/linux/ipv6.h | 4 +++- include/net/xfrm.h | 5 +++++ net/ipv6/datagram.c | 18 ++++++++++++++++++ net/ipv6/ipv6_sockglue.c | 26 ++++++++++++++++++++++++++ 5 files changed, 59 insertions(+), 1 deletions(-) diff --git a/include/linux/in6.h b/include/linux/in6.h index c4bf46f..52a98ab 100644 --- a/include/linux/in6.h +++ b/include/linux/in6.h @@ -283,4 +283,11 @@ struct in6_flowlabel_req { * MRT6_PIM 208 * (reserved) 209 */ + +/* IRO (IPsec Route Optimization) sockopts */ +#define IPV6_RECVIROSRC 74 +#define IPV6_IROSRC 75 +#define IPV6_RECVIRODST 76 +#define IPV6_IRODST 77 + #endif diff --git a/include/linux/ipv6.h b/include/linux/ipv6.h index e62683b..55289ee 100644 --- a/include/linux/ipv6.h +++ b/include/linux/ipv6.h @@ -341,7 +341,9 @@ struct ipv6_pinfo { odstopts:1, rxflow:1, rxtclass:1, - rxpmtu:1; + rxpmtu:1, + irosrc:1, + irodst:1; } bits; __u16 all; } rxopt; diff --git a/include/net/xfrm.h b/include/net/xfrm.h index 4f53532..e6a753c 100644 --- a/include/net/xfrm.h +++ b/include/net/xfrm.h @@ -909,6 +909,11 @@ struct sec_path { atomic_t refcnt; int len; struct xfrm_state *xvec[XFRM_MAX_DEPTH]; + +#ifdef CONFIG_XFRM_SUB_POLICY + struct in6_addr irosrc; + struct in6_addr irodst; +#endif }; static inline struct sec_path * diff --git a/net/ipv6/datagram.c b/net/ipv6/datagram.c index ef371aa..2952c9e 100644 --- a/net/ipv6/datagram.c +++ b/net/ipv6/datagram.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include @@ -504,6 +505,23 @@ int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb) put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); } +#ifdef CONFIG_XFRM_SUB_POLICY + /* If access to IRO-remapped source or destination address has been + * requested and it has indeed been remapped, provide the on-wire + * address to userland */ + if (skb_sec_path(skb)) { + struct sec_path *sp = skb_sec_path(skb); + + if (np->rxopt.bits.irosrc && !ipv6_addr_any(&sp->irosrc)) + put_cmsg(msg, SOL_IPV6, IPV6_IROSRC, + sizeof(sp->irosrc), &sp->irosrc); + + if (np->rxopt.bits.irodst && !ipv6_addr_any(&sp->irodst)) + put_cmsg(msg, SOL_IPV6, IPV6_IRODST, + sizeof(sp->irodst), &sp->irodst); + } +#endif + if (opt->lastopt && (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { /* diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index a7f66bc..722a49f 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -302,6 +302,22 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, retv = 0; break; +#ifdef CONFIG_XFRM_SUB_POLICY + case IPV6_RECVIROSRC: + if (optlen < sizeof(int)) + goto e_inval; + np->rxopt.bits.irosrc = valbool; + retv = 0; + break; + + case IPV6_RECVIRODST: + if (optlen < sizeof(int)) + goto e_inval; + np->rxopt.bits.irodst = valbool; + retv = 0; + break; +#endif + case IPV6_2292DSTOPTS: if (optlen < sizeof(int)) goto e_inval; @@ -1056,6 +1072,16 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname, val = np->rxopt.bits.dstopts; break; +#ifdef CONFIG_XFRM_SUB_POLICY + case IPV6_RECVIROSRC: + val = np->rxopt.bits.irosrc; + break; + + case IPV6_RECVIRODST: + val = np->rxopt.bits.irodst; + break; +#endif + case IPV6_2292DSTOPTS: val = np->rxopt.bits.odstopts; break; -- 1.7.1