[PATCH net-next v2 3/4] net: sched: em_ipt: keep the user-specified nfproto and use it
From: Nikolay Aleksandrov <hidden>
Date: 2019-06-26 15:56:38
Subsystem:
networking [general], tc subsystem, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Jamal Hadi Salim, Jiri Pirko, Linus Torvalds
For NFPROTO_UNSPEC xt_matches there's no way to restrict the matching to a specific family, in order to do so we record the user-specified family and later enforce it while doing the match. v2: adjust changes to missing patch, was patch 04 in v1 Signed-off-by: Nikolay Aleksandrov <redacted> --- net/sched/em_ipt.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-)
diff --git a/net/sched/em_ipt.c b/net/sched/em_ipt.c
index fd7f5b288c31..ce91f3cea0bd 100644
--- a/net/sched/em_ipt.c
+++ b/net/sched/em_ipt.c@@ -21,6 +21,7 @@ struct em_ipt_match { const struct xt_match *match; u32 hook; + u8 nfproto; u8 match_data[0] __aligned(8); };
@@ -115,6 +116,7 @@ static int em_ipt_change(struct net *net, void *data, int data_len, struct em_ipt_match *im = NULL; struct xt_match *match; int mdata_len, ret; + u8 nfproto; ret = nla_parse_deprecated(tb, TCA_EM_IPT_MAX, data, data_len, em_ipt_policy, NULL);
@@ -125,6 +127,16 @@ static int em_ipt_change(struct net *net, void *data, int data_len, !tb[TCA_EM_IPT_MATCH_DATA] || !tb[TCA_EM_IPT_NFPROTO]) return -EINVAL; + nfproto = nla_get_u8(tb[TCA_EM_IPT_NFPROTO]); + switch (nfproto) { + case NFPROTO_IPV4: + case NFPROTO_IPV6: + case NFPROTO_UNSPEC: + break; + default: + return -EINVAL; + } + match = get_xt_match(tb); if (IS_ERR(match)) { pr_err("unable to load match\n");
@@ -140,6 +152,7 @@ static int em_ipt_change(struct net *net, void *data, int data_len, im->match = match; im->hook = nla_get_u32(tb[TCA_EM_IPT_HOOK]); + im->nfproto = nfproto; nla_memcpy(im->match_data, tb[TCA_EM_IPT_MATCH_DATA], mdata_len); ret = check_match(net, im, mdata_len);
@@ -182,8 +195,8 @@ static int em_ipt_match(struct sk_buff *skb, struct tcf_ematch *em, const struct em_ipt_match *im = (const void *)em->data; struct xt_action_param acpar = {}; struct net_device *indev = NULL; - u8 nfproto = im->match->family; struct nf_hook_state state; + u8 nfproto = im->nfproto; int ret; switch (tc_skb_protocol(skb)) {
@@ -231,7 +244,7 @@ static int em_ipt_dump(struct sk_buff *skb, struct tcf_ematch *em) return -EMSGSIZE; if (nla_put_u8(skb, TCA_EM_IPT_MATCH_REVISION, im->match->revision) < 0) return -EMSGSIZE; - if (nla_put_u8(skb, TCA_EM_IPT_NFPROTO, im->match->family) < 0) + if (nla_put_u8(skb, TCA_EM_IPT_NFPROTO, im->nfproto) < 0) return -EMSGSIZE; if (nla_put(skb, TCA_EM_IPT_MATCH_DATA, im->match->usersize ?: im->match->matchsize,
--
2.20.1