From 88aab2f02acc33f348fb6e4f9c31a41e4776e4ba Mon Sep 17 00:00:00 2001 From: Pablo Neira Ayuso Date: Tue, 17 Dec 2019 18:17:00 +0100 Subject: rt: add parse and build userdata interface Add support for meta userdata area. Signed-off-by: Pablo Neira Ayuso Signed-off-by: Florian Westphal --- src/rt.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) (limited to 'src/rt.c') diff --git a/src/rt.c b/src/rt.c index b19c44d6..d7aa5edd 100644 --- a/src/rt.c +++ b/src/rt.c @@ -114,6 +114,55 @@ static void rt_expr_clone(struct expr *new, const struct expr *expr) new->rt.key = expr->rt.key; } +#define NFTNL_UDATA_RT_KEY 0 +#define NFTNL_UDATA_RT_MAX 1 + +static int rt_expr_build_udata(struct nftnl_udata_buf *udbuf, + const struct expr *expr) +{ + nftnl_udata_put_u32(udbuf, NFTNL_UDATA_RT_KEY, expr->rt.key); + + return 0; +} + +static int rt_parse_udata(const struct nftnl_udata *attr, void *data) +{ + const struct nftnl_udata **ud = data; + uint8_t type = nftnl_udata_type(attr); + uint8_t len = nftnl_udata_len(attr); + + switch (type) { + case NFTNL_UDATA_RT_KEY: + if (len != sizeof(uint32_t)) + return -1; + break; + default: + return 0; + } + + ud[type] = attr; + return 0; +} + +static struct expr *rt_expr_parse_udata(const struct nftnl_udata *attr) +{ + const struct nftnl_udata *ud[NFTNL_UDATA_RT_MAX + 1] = {}; + uint32_t key; + int err; + + err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr), + rt_parse_udata, ud); + if (err < 0) + return NULL; + + if (!ud[NFTNL_UDATA_RT_KEY]) + return NULL; + + key = nftnl_udata_get_u32(ud[NFTNL_UDATA_RT_KEY]); + + return rt_expr_alloc(&internal_location, key, false); +} + const struct expr_ops rt_expr_ops = { .type = EXPR_RT, .name = "rt", @@ -121,6 +170,8 @@ const struct expr_ops rt_expr_ops = { .json = rt_expr_json, .cmp = rt_expr_cmp, .clone = rt_expr_clone, + .parse_udata = rt_expr_parse_udata, + .build_udata = rt_expr_build_udata, }; struct expr *rt_expr_alloc(const struct location *loc, enum nft_rt_keys key, -- cgit v1.2.3