* [PATCH net-next v4] net: ip6mr: add RTM_GETROUTE netlink op
@ 2022-07-06 10:00 David Lamparter
2022-07-06 10:38 ` Nikolay Aleksandrov
2022-07-06 14:44 ` David Ahern
0 siblings, 2 replies; 3+ messages in thread
From: David Lamparter @ 2022-07-06 10:00 UTC (permalink / raw)
To: netdev
Cc: David S. Miller, David Ahern, Eric Dumazet, David Lamparter,
Nikolay Aleksandrov
The IPv6 multicast routing code previously implemented only the dump
variant of RTM_GETROUTE. Implement single MFC item retrieval by copying
and adapting the respective IPv4 code.
Tested against FRRouting's IPv6 PIM stack.
Signed-off-by: David Lamparter <equinox@diac24.net>
Cc: David Ahern <dsahern@kernel.org>
Cc: Nikolay Aleksandrov <razor@blackwall.org>
---
v4: rename policy to indicate it is dedicated for getroute, remove
extra validation loop to reject attrs, and add missing "static".
v3: reorder/remove some redundant bits, fix style. Thanks Nikolay for
pointing them out. The "extra" validation loop is still there for the
time being; happy to drop it if that's the consensus.
v2: changeover to strict netlink attribute parsing. Doing so actually
exposed a bunch of other issues, first and foremost that rtm_ipv6_policy
does not have RTA_SRC or RTA_DST. This made reusing that policy rather
pointless so I changed it to use a separate rtm_ipv6_mr_policy.
Thanks again dsahern@ for the feedback on the previous version!
---
net/ipv6/ip6mr.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 101 insertions(+), 1 deletion(-)
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index ec6e1509fc7c..f567c055dba4 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -95,6 +95,8 @@ static int ip6mr_cache_report(const struct mr_table *mrt, struct sk_buff *pkt,
static void mr6_netlink_event(struct mr_table *mrt, struct mfc6_cache *mfc,
int cmd);
static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pkt);
+static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack);
static int ip6mr_rtm_dumproute(struct sk_buff *skb,
struct netlink_callback *cb);
static void mroute_clean_tables(struct mr_table *mrt, int flags);
@@ -1390,7 +1392,7 @@ int __init ip6_mr_init(void)
}
#endif
err = rtnl_register_module(THIS_MODULE, RTNL_FAMILY_IP6MR, RTM_GETROUTE,
- NULL, ip6mr_rtm_dumproute, 0);
+ ip6mr_rtm_getroute, ip6mr_rtm_dumproute, 0);
if (err == 0)
return 0;
@@ -2510,6 +2512,104 @@ static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pk
rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS);
}
+static const struct nla_policy ip6mr_getroute_policy[RTA_MAX + 1] = {
+ [RTA_SRC] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
+ [RTA_DST] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
+ [RTA_TABLE] = { .type = NLA_U32 },
+};
+
+static int ip6mr_rtm_valid_getroute_req(struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ struct nlattr **tb,
+ struct netlink_ext_ack *extack)
+{
+ struct rtmsg *rtm;
+ int err;
+
+ err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, ip6mr_getroute_policy,
+ extack);
+ if (err)
+ return err;
+
+ rtm = nlmsg_data(nlh);
+ if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
+ (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
+ rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
+ rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
+ NL_SET_ERR_MSG(extack,
+ "ipv6: Invalid values in header for multicast route get request");
+ return -EINVAL;
+ }
+
+ if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
+ (tb[RTA_DST] && !rtm->rtm_dst_len)) {
+ NL_SET_ERR_MSG(extack, "ipv6: rtm_src_len and rtm_dst_len must be 128 for IPv6");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
+ struct netlink_ext_ack *extack)
+{
+ struct net *net = sock_net(in_skb->sk);
+ struct in6_addr src = {}, grp = {};
+ struct nlattr *tb[RTA_MAX + 1];
+ struct sk_buff *skb = NULL;
+ struct mfc6_cache *cache;
+ struct mr_table *mrt;
+ u32 tableid;
+ int err;
+
+ err = ip6mr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
+ if (err < 0)
+ goto errout;
+
+ if (tb[RTA_SRC])
+ src = nla_get_in6_addr(tb[RTA_SRC]);
+ if (tb[RTA_DST])
+ grp = nla_get_in6_addr(tb[RTA_DST]);
+ tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
+
+ mrt = ip6mr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
+ if (!mrt) {
+ NL_SET_ERR_MSG_MOD(extack, "ipv6 MR table does not exist");
+ err = -ENOENT;
+ goto errout_free;
+ }
+
+ /* entries are added/deleted only under RTNL */
+ rcu_read_lock();
+ cache = ip6mr_cache_find(mrt, &src, &grp);
+ rcu_read_unlock();
+ if (!cache) {
+ NL_SET_ERR_MSG_MOD(extack, "ipv6 MR cache entry not found");
+ err = -ENOENT;
+ goto errout_free;
+ }
+
+ skb = nlmsg_new(mr6_msgsize(false, mrt->maxvif), GFP_KERNEL);
+ if (!skb) {
+ err = -ENOBUFS;
+ goto errout_free;
+ }
+
+ err = ip6mr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, cache, RTM_NEWROUTE, 0);
+ if (err < 0)
+ goto errout_free;
+
+ err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
+
+errout:
+ return err;
+
+errout_free:
+ kfree_skb(skb);
+ goto errout;
+}
+
static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
{
const struct nlmsghdr *nlh = cb->nlh;
--
2.36.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH net-next v4] net: ip6mr: add RTM_GETROUTE netlink op
2022-07-06 10:00 [PATCH net-next v4] net: ip6mr: add RTM_GETROUTE netlink op David Lamparter
@ 2022-07-06 10:38 ` Nikolay Aleksandrov
2022-07-06 14:44 ` David Ahern
1 sibling, 0 replies; 3+ messages in thread
From: Nikolay Aleksandrov @ 2022-07-06 10:38 UTC (permalink / raw)
To: David Lamparter, netdev; +Cc: David S. Miller, David Ahern, Eric Dumazet
On 06/07/2022 13:00, David Lamparter wrote:
> The IPv6 multicast routing code previously implemented only the dump
> variant of RTM_GETROUTE. Implement single MFC item retrieval by copying
> and adapting the respective IPv4 code.
>
> Tested against FRRouting's IPv6 PIM stack.
>
> Signed-off-by: David Lamparter <equinox@diac24.net>
> Cc: David Ahern <dsahern@kernel.org>
> Cc: Nikolay Aleksandrov <razor@blackwall.org>
> ---
>
> v4: rename policy to indicate it is dedicated for getroute, remove
> extra validation loop to reject attrs, and add missing "static".
>
> v3: reorder/remove some redundant bits, fix style. Thanks Nikolay for
> pointing them out. The "extra" validation loop is still there for the
> time being; happy to drop it if that's the consensus.
>
> v2: changeover to strict netlink attribute parsing. Doing so actually
> exposed a bunch of other issues, first and foremost that rtm_ipv6_policy
> does not have RTA_SRC or RTA_DST. This made reusing that policy rather
> pointless so I changed it to use a separate rtm_ipv6_mr_policy.
>
> Thanks again dsahern@ for the feedback on the previous version!
>
> ---
> net/ipv6/ip6mr.c | 102 ++++++++++++++++++++++++++++++++++++++++++++++-
> 1 file changed, 101 insertions(+), 1 deletion(-)
>
Patch looks good to me overall, one minor nit below in case there's a next version.
Thanks,
Reviewed-by: Nikolay Aleksandrov <razor@blackwall.org>
> diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
> index ec6e1509fc7c..f567c055dba4 100644
> --- a/net/ipv6/ip6mr.c
> +++ b/net/ipv6/ip6mr.c
[snip]
> +static int ip6mr_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh,
> + struct netlink_ext_ack *extack)
> +{
> + struct net *net = sock_net(in_skb->sk);
> + struct in6_addr src = {}, grp = {};
> + struct nlattr *tb[RTA_MAX + 1];
> + struct sk_buff *skb = NULL;
> + struct mfc6_cache *cache;
> + struct mr_table *mrt;
> + u32 tableid;
> + int err;
> +
> + err = ip6mr_rtm_valid_getroute_req(in_skb, nlh, tb, extack);
> + if (err < 0)
> + goto errout;
> +
> + if (tb[RTA_SRC])
> + src = nla_get_in6_addr(tb[RTA_SRC]);
> + if (tb[RTA_DST])
> + grp = nla_get_in6_addr(tb[RTA_DST]);
> + tableid = tb[RTA_TABLE] ? nla_get_u32(tb[RTA_TABLE]) : 0;
> +
> + mrt = ip6mr_get_table(net, tableid ? tableid : RT_TABLE_DEFAULT);
> + if (!mrt) {
> + NL_SET_ERR_MSG_MOD(extack, "ipv6 MR table does not exist");
minor nit: some errors have ":" after "ipv6", in this function's errors it's missing
> + err = -ENOENT;
> + goto errout_free;
> + }
> +
> + /* entries are added/deleted only under RTNL */
> + rcu_read_lock();
> + cache = ip6mr_cache_find(mrt, &src, &grp);
> + rcu_read_unlock();
> + if (!cache) {
> + NL_SET_ERR_MSG_MOD(extack, "ipv6 MR cache entry not found");
ditto
> + err = -ENOENT;
> + goto errout_free;
> + }
> +
> + skb = nlmsg_new(mr6_msgsize(false, mrt->maxvif), GFP_KERNEL);
> + if (!skb) {
> + err = -ENOBUFS;
> + goto errout_free;
> + }
> +
> + err = ip6mr_fill_mroute(mrt, skb, NETLINK_CB(in_skb).portid,
> + nlh->nlmsg_seq, cache, RTM_NEWROUTE, 0);
> + if (err < 0)
> + goto errout_free;
> +
> + err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid);
> +
> +errout:
> + return err;
> +
> +errout_free:
> + kfree_skb(skb);
> + goto errout;
> +}
> +
> static int ip6mr_rtm_dumproute(struct sk_buff *skb, struct netlink_callback *cb)
> {
> const struct nlmsghdr *nlh = cb->nlh;
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH net-next v4] net: ip6mr: add RTM_GETROUTE netlink op
2022-07-06 10:00 [PATCH net-next v4] net: ip6mr: add RTM_GETROUTE netlink op David Lamparter
2022-07-06 10:38 ` Nikolay Aleksandrov
@ 2022-07-06 14:44 ` David Ahern
1 sibling, 0 replies; 3+ messages in thread
From: David Ahern @ 2022-07-06 14:44 UTC (permalink / raw)
To: David Lamparter, netdev
Cc: David S. Miller, Eric Dumazet, Nikolay Aleksandrov
On 7/6/22 4:00 AM, David Lamparter wrote:
> diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
> index ec6e1509fc7c..f567c055dba4 100644
> --- a/net/ipv6/ip6mr.c
> +++ b/net/ipv6/ip6mr.c
> @@ -2510,6 +2512,104 @@ static void mrt6msg_netlink_event(const struct mr_table *mrt, struct sk_buff *pk
> rtnl_set_sk_err(net, RTNLGRP_IPV6_MROUTE_R, -ENOBUFS);
> }
>
> +static const struct nla_policy ip6mr_getroute_policy[RTA_MAX + 1] = {
> + [RTA_SRC] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
> + [RTA_DST] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
> + [RTA_TABLE] = { .type = NLA_U32 },
> +};
> +
> +static int ip6mr_rtm_valid_getroute_req(struct sk_buff *skb,
> + const struct nlmsghdr *nlh,
> + struct nlattr **tb,
> + struct netlink_ext_ack *extack)
> +{
> + struct rtmsg *rtm;
> + int err;
> +
> + err = nlmsg_parse(nlh, sizeof(*rtm), tb, RTA_MAX, ip6mr_getroute_policy,
> + extack);
> + if (err)
> + return err;
> +
> + rtm = nlmsg_data(nlh);
> + if ((rtm->rtm_src_len && rtm->rtm_src_len != 128) ||
> + (rtm->rtm_dst_len && rtm->rtm_dst_len != 128) ||
> + rtm->rtm_tos || rtm->rtm_table || rtm->rtm_protocol ||
> + rtm->rtm_scope || rtm->rtm_type || rtm->rtm_flags) {
> + NL_SET_ERR_MSG(extack,
> + "ipv6: Invalid values in header for multicast route get request");
This (and other NL_SET_ERR_MSG) should be NL_SET_ERR_MSG_MOD and then
drop the "ipv6: " prefix on the messages; it comes from 'KBUILD_MODNAME
": "'
> + return -EINVAL;
> + }
> +
> + if ((tb[RTA_SRC] && !rtm->rtm_src_len) ||
> + (tb[RTA_DST] && !rtm->rtm_dst_len)) {
> + NL_SET_ERR_MSG(extack, "ipv6: rtm_src_len and rtm_dst_len must be 128 for IPv6");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
with that change:
Reviewed-by: David Ahern <dsahern@kernel.org>
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2022-07-06 14:44 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2022-07-06 10:00 [PATCH net-next v4] net: ip6mr: add RTM_GETROUTE netlink op David Lamparter
2022-07-06 10:38 ` Nikolay Aleksandrov
2022-07-06 14:44 ` David Ahern
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