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[IPv6]: Export userland ND options through netlink (RDNSS support)
As discussed before, this patch provides userland with a way to access relevant options in Router Advertisements, after they are processed and validated by the kernel. Extra options are processed in a generic way; this patch only exports RDNSS options described in RFC5006, but support to control which options are exported could be easily added. A new rtnetlink message type is defined, to transport Neighbor Discovery options, along with optional context information. At the moment only the address of the router sending an RDNSS option is included, but additional attributes may be later defined, if needed by new use cases. Signed-off-by: Pierre Ynard <linkfanel@yahoo.fr> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pierre Ynard
David S. Miller
parent
092e9d93b3
commit
31910575a9
@ -97,6 +97,9 @@ enum {
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RTM_SETNEIGHTBL,
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#define RTM_SETNEIGHTBL RTM_SETNEIGHTBL
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RTM_NEWNDUSEROPT = 68,
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#define RTM_NEWNDUSEROPT RTM_NEWNDUSEROPT
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__RTM_MAX,
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#define RTM_MAX (((__RTM_MAX + 3) & ~3) - 1)
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};
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@ -479,6 +482,30 @@ enum
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#define TCA_RTA(r) ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct tcmsg))))
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#define TCA_PAYLOAD(n) NLMSG_PAYLOAD(n,sizeof(struct tcmsg))
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/********************************************************************
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* Neighbor Discovery userland options
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****/
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struct nduseroptmsg
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{
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unsigned char nduseropt_family;
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unsigned char nduseropt_pad1;
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unsigned short nduseropt_opts_len; /* Total length of options */
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__u8 nduseropt_icmp_type;
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__u8 nduseropt_icmp_code;
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unsigned short nduseropt_pad2;
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/* Followed by one or more ND options */
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};
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enum
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{
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NDUSEROPT_UNSPEC,
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NDUSEROPT_SRCADDR,
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__NDUSEROPT_MAX
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};
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#define NDUSEROPT_MAX (__NDUSEROPT_MAX - 1)
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#ifndef __KERNEL__
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/* RTnetlink multicast groups - backwards compatibility for userspace */
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#define RTMGRP_LINK 1
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@ -542,6 +569,8 @@ enum rtnetlink_groups {
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#define RTNLGRP_IPV6_PREFIX RTNLGRP_IPV6_PREFIX
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RTNLGRP_IPV6_RULE,
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#define RTNLGRP_IPV6_RULE RTNLGRP_IPV6_RULE
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RTNLGRP_ND_USEROPT,
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#define RTNLGRP_ND_USEROPT RTNLGRP_ND_USEROPT
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__RTNLGRP_MAX
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};
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#define RTNLGRP_MAX (__RTNLGRP_MAX - 1)
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@ -24,6 +24,7 @@ enum {
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ND_OPT_MTU = 5, /* RFC2461 */
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__ND_OPT_ARRAY_MAX,
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ND_OPT_ROUTE_INFO = 24, /* RFC4191 */
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ND_OPT_RDNSS = 25, /* RFC5006 */
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__ND_OPT_MAX
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};
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103
net/ipv6/ndisc.c
103
net/ipv6/ndisc.c
@ -15,9 +15,10 @@
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/*
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* Changes:
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*
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* Pierre Ynard : export userland ND options
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* through netlink (RDNSS support)
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* Lars Fenneberg : fixed MTU setting on receipt
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* of an RA.
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*
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* Janos Farkas : kmalloc failure checks
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* Alexey Kuznetsov : state machine reworked
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* and moved to net/core.
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@ -78,6 +79,9 @@
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#include <net/addrconf.h>
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#include <net/icmp.h>
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#include <net/netlink.h>
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#include <linux/rtnetlink.h>
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#include <net/flow.h>
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#include <net/ip6_checksum.h>
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#include <linux/proc_fs.h>
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@ -161,6 +165,8 @@ struct ndisc_options {
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struct nd_opt_hdr *nd_opts_ri;
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struct nd_opt_hdr *nd_opts_ri_end;
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#endif
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struct nd_opt_hdr *nd_useropts;
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struct nd_opt_hdr *nd_useropts_end;
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};
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#define nd_opts_src_lladdr nd_opt_array[ND_OPT_SOURCE_LL_ADDR]
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@ -225,6 +231,22 @@ static struct nd_opt_hdr *ndisc_next_option(struct nd_opt_hdr *cur,
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return (cur <= end && cur->nd_opt_type == type ? cur : NULL);
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}
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static inline int ndisc_is_useropt(struct nd_opt_hdr *opt)
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{
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return (opt->nd_opt_type == ND_OPT_RDNSS);
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}
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static struct nd_opt_hdr *ndisc_next_useropt(struct nd_opt_hdr *cur,
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struct nd_opt_hdr *end)
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{
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if (!cur || !end || cur >= end)
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return NULL;
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do {
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cur = ((void *)cur) + (cur->nd_opt_len << 3);
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} while(cur < end && !ndisc_is_useropt(cur));
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return (cur <= end && ndisc_is_useropt(cur) ? cur : NULL);
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}
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static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
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struct ndisc_options *ndopts)
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{
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@ -267,14 +289,21 @@ static struct ndisc_options *ndisc_parse_options(u8 *opt, int opt_len,
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break;
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#endif
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default:
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/*
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* Unknown options must be silently ignored,
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* to accommodate future extension to the protocol.
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*/
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ND_PRINTK2(KERN_NOTICE
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"%s(): ignored unsupported option; type=%d, len=%d\n",
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__FUNCTION__,
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nd_opt->nd_opt_type, nd_opt->nd_opt_len);
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if (ndisc_is_useropt(nd_opt)) {
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ndopts->nd_useropts_end = nd_opt;
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if (!ndopts->nd_useropts)
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ndopts->nd_useropts = nd_opt;
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} else {
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/*
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* Unknown options must be silently ignored,
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* to accommodate future extension to the
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* protocol.
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*/
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ND_PRINTK2(KERN_NOTICE
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"%s(): ignored unsupported option; type=%d, len=%d\n",
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__FUNCTION__,
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nd_opt->nd_opt_type, nd_opt->nd_opt_len);
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}
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}
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opt_len -= l;
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nd_opt = ((void *)nd_opt) + l;
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@ -984,6 +1013,53 @@ out:
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in6_dev_put(idev);
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}
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static void ndisc_ra_useropt(struct sk_buff *ra, struct nd_opt_hdr *opt)
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{
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struct icmp6hdr *icmp6h = (struct icmp6hdr *)skb_transport_header(ra);
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struct sk_buff *skb;
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struct nlmsghdr *nlh;
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struct nduseroptmsg *ndmsg;
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int err;
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int base_size = NLMSG_ALIGN(sizeof(struct nduseroptmsg)
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+ (opt->nd_opt_len << 3));
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size_t msg_size = base_size + nla_total_size(sizeof(struct in6_addr));
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skb = nlmsg_new(msg_size, GFP_ATOMIC);
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if (skb == NULL) {
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err = -ENOBUFS;
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goto errout;
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}
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nlh = nlmsg_put(skb, 0, 0, RTM_NEWNDUSEROPT, base_size, 0);
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if (nlh == NULL) {
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goto nla_put_failure;
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}
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ndmsg = nlmsg_data(nlh);
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ndmsg->nduseropt_family = AF_INET6;
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ndmsg->nduseropt_icmp_type = icmp6h->icmp6_type;
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ndmsg->nduseropt_icmp_code = icmp6h->icmp6_code;
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ndmsg->nduseropt_opts_len = opt->nd_opt_len << 3;
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memcpy(ndmsg + 1, opt, opt->nd_opt_len << 3);
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NLA_PUT(skb, NDUSEROPT_SRCADDR, sizeof(struct in6_addr),
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&ipv6_hdr(ra)->saddr);
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nlmsg_end(skb, nlh);
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err = rtnl_notify(skb, 0, RTNLGRP_ND_USEROPT, NULL, GFP_ATOMIC);
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if (err < 0)
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goto errout;
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return;
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nla_put_failure:
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nlmsg_free(skb);
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err = -EMSGSIZE;
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errout:
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rtnl_set_sk_err(RTNLGRP_ND_USEROPT, err);
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}
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static void ndisc_router_discovery(struct sk_buff *skb)
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{
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struct ra_msg *ra_msg = (struct ra_msg *)skb_transport_header(skb);
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@ -1216,6 +1292,15 @@ skip_defrtr:
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}
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}
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if (ndopts.nd_useropts) {
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struct nd_opt_hdr *opt;
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for (opt = ndopts.nd_useropts;
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opt;
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opt = ndisc_next_useropt(opt, ndopts.nd_useropts_end)) {
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ndisc_ra_useropt(skb, opt);
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}
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}
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if (ndopts.nd_opts_tgt_lladdr || ndopts.nd_opts_rh) {
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ND_PRINTK2(KERN_WARNING
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"ICMPv6 RA: invalid RA options");
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