diff options
author | Pablo Neira Ayuso <pablo@netfilter.org> | 2019-12-17 18:17:02 +0100 |
---|---|---|
committer | Florian Westphal <fw@strlen.de> | 2019-12-17 23:10:46 +0100 |
commit | 24547258d25cde9256033d1056cf4a9b7a1465dd (patch) | |
tree | 3da1c2d0f403268fbab456b8c8176435852fdab8 /src/xfrm.c | |
parent | 53ef42085f0206afca2f40f6d9d73bd663065aea (diff) |
xfrm: add parse and build userdata interface
Add support for meta userdata area.
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Florian Westphal <fw@strlen.de>
Diffstat (limited to 'src/xfrm.c')
-rw-r--r-- | src/xfrm.c | 61 |
1 files changed, 61 insertions, 0 deletions
@@ -91,6 +91,65 @@ static void xfrm_expr_clone(struct expr *new, const struct expr *expr) memcpy(&new->xfrm, &expr->xfrm, sizeof(new->xfrm)); } +#define NFTNL_UDATA_XFRM_KEY 0 +#define NFTNL_UDATA_XFRM_SPNUM 1 +#define NFTNL_UDATA_XFRM_DIR 2 +#define NFTNL_UDATA_XFRM_MAX 3 + +static int xfrm_expr_build_udata(struct nftnl_udata_buf *udbuf, + const struct expr *expr) +{ + nftnl_udata_put_u32(udbuf, NFTNL_UDATA_XFRM_KEY, expr->xfrm.key); + nftnl_udata_put_u32(udbuf, NFTNL_UDATA_XFRM_SPNUM, expr->xfrm.spnum); + nftnl_udata_put_u32(udbuf, NFTNL_UDATA_XFRM_DIR, expr->xfrm.direction); + + return 0; +} + +static int xfrm_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_XFRM_KEY: + case NFTNL_UDATA_XFRM_SPNUM: + case NFTNL_UDATA_XFRM_DIR: + if (len != sizeof(uint32_t)) + return -1; + break; + default: + return 0; + } + + ud[type] = attr; + return 0; +} + +static struct expr *xfrm_expr_parse_udata(const struct nftnl_udata *attr) +{ + const struct nftnl_udata *ud[NFTNL_UDATA_XFRM_MAX + 1] = {}; + uint32_t key, dir, spnum; + int err; + + err = nftnl_udata_parse(nftnl_udata_get(attr), nftnl_udata_len(attr), + xfrm_parse_udata, ud); + if (err < 0) + return NULL; + + if (!ud[NFTNL_UDATA_XFRM_KEY] || + !ud[NFTNL_UDATA_XFRM_DIR] || + !ud[NFTNL_UDATA_XFRM_SPNUM]) + return NULL; + + key = nftnl_udata_get_u32(ud[NFTNL_UDATA_XFRM_KEY]); + dir = nftnl_udata_get_u32(ud[NFTNL_UDATA_XFRM_DIR]); + spnum = nftnl_udata_get_u32(ud[NFTNL_UDATA_XFRM_SPNUM]); + + return xfrm_expr_alloc(&internal_location, dir, spnum, key); +} + const struct expr_ops xfrm_expr_ops = { .type = EXPR_XFRM, .name = "xfrm", @@ -98,6 +157,8 @@ const struct expr_ops xfrm_expr_ops = { .json = xfrm_expr_json, .cmp = xfrm_expr_cmp, .clone = xfrm_expr_clone, + .parse_udata = xfrm_expr_parse_udata, + .build_udata = xfrm_expr_build_udata, }; struct expr *xfrm_expr_alloc(const struct location *loc, |