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| author |   Amir Vadai <amir@vadai.me> | 2017-02-07 09:56:08 +0200 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2017-02-10 13:18:33 -0500 |
| commit | 853a14ba4682f820266469979c9297debc05f60c (patch) | |
| tree | 5475357c2342327746b5f99a67d46f4eb4ef78d3 /net/sched/act_pedit.c | |
| parent | net/act_pedit: Support using offset relative to the conventional network headers (diff) | |
| download | linux-dev-853a14ba4682f820266469979c9297debc05f60c.tar.xz linux-dev-853a14ba4682f820266469979c9297debc05f60c.zip | |
net/act_pedit: Introduce 'add' operation
This command could be useful to inc/dec fields.
For example, to forward any TCP packet and decrease its TTL:
$ tc filter add dev enp0s9 protocol ip parent ffff: \
flower ip_proto tcp \
action pedit munge ip ttl add 0xff pipe \
action mirred egress redirect dev veth0
In the example above, adding 0xff to this u8 field is actually
decreasing it by one, since the operation is masked.
Signed-off-by: Amir Vadai <amir@vadai.me>
Reviewed-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/act_pedit.c')
| -rw-r--r-- | net/sched/act_pedit.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/net/sched/act_pedit.c b/net/sched/act_pedit.c index fdd012bd3602..c1310472f620 100644 --- a/net/sched/act_pedit.c +++ b/net/sched/act_pedit.c @@ -36,6 +36,7 @@ static const struct nla_policy pedit_policy[TCA_PEDIT_MAX + 1] = { static const struct nla_policy pedit_key_ex_policy[TCA_PEDIT_KEY_EX_MAX + 1] = { [TCA_PEDIT_KEY_EX_HTYPE] = { .type = NLA_U16 }, + [TCA_PEDIT_KEY_EX_CMD] = { .type = NLA_U16 }, }; static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla, @@ -75,14 +76,17 @@ static struct tcf_pedit_key_ex *tcf_pedit_keys_ex_parse(struct nlattr *nla, if (err) goto err_out; - if (!tb[TCA_PEDIT_KEY_EX_HTYPE]) { + if (!tb[TCA_PEDIT_KEY_EX_HTYPE] || + !tb[TCA_PEDIT_KEY_EX_CMD]) { err = -EINVAL; goto err_out; } k->htype = nla_get_u16(tb[TCA_PEDIT_KEY_EX_HTYPE]); + k->cmd = nla_get_u16(tb[TCA_PEDIT_KEY_EX_CMD]); - if (k->htype > TCA_PEDIT_HDR_TYPE_MAX) { + if (k->htype > TCA_PEDIT_HDR_TYPE_MAX || + k->cmd > TCA_PEDIT_CMD_MAX) { err = -EINVAL; goto err_out; } @@ -110,7 +114,8 @@ static int tcf_pedit_key_ex_dump(struct sk_buff *skb, key_start = nla_nest_start(skb, TCA_PEDIT_KEY_EX); - if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype)) { + if (nla_put_u16(skb, TCA_PEDIT_KEY_EX_HTYPE, keys_ex->htype) || + nla_put_u16(skb, TCA_PEDIT_KEY_EX_CMD, keys_ex->cmd)) { nlmsg_trim(skb, keys_start); return -EINVAL; } @@ -280,15 +285,19 @@ static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a, struct tc_pedit_key *tkey = p->tcfp_keys; struct tcf_pedit_key_ex *tkey_ex = p->tcfp_keys_ex; enum pedit_header_type htype = TCA_PEDIT_KEY_EX_HDR_TYPE_NETWORK; + enum pedit_cmd cmd = TCA_PEDIT_KEY_EX_CMD_SET; for (i = p->tcfp_nkeys; i > 0; i--, tkey++) { u32 *ptr, _data; int offset = tkey->off; int hoffset; + u32 val; int rc; if (tkey_ex) { htype = tkey_ex->htype; + cmd = tkey_ex->cmd; + tkey_ex++; } @@ -330,7 +339,20 @@ static int tcf_pedit(struct sk_buff *skb, const struct tc_action *a, if (!ptr) goto bad; /* just do it, baby */ - *ptr = ((*ptr & tkey->mask) ^ tkey->val); + switch (cmd) { + case TCA_PEDIT_KEY_EX_CMD_SET: + val = tkey->val; + break; + case TCA_PEDIT_KEY_EX_CMD_ADD: + val = (*ptr + tkey->val) & ~tkey->mask; + break; + default: + pr_info("tc filter pedit bad command (%d)\n", + cmd); + goto bad; + } + + *ptr = ((*ptr & tkey->mask) ^ val); if (ptr == &_data) skb_store_bits(skb, hoffset + offset, ptr, 4); } |