libifconfig: fix carp key configuration
There were two issues with the carp key configuration in the new netlink code. The first is that userspace failed to actually pass the CARP_NL_KEY attribute to the kernel, so a key was never set. The second issue is that snl_attr_get_string() returns a pointer to the string inside the netlink message. It does not copy the string to the target buffer. That's somewhat inconvenient to work with in libifconfig where we have a static buffer for the key. Introduce snl_attr_copy_string() which can copy a string to a target buffer and uses the 'arg' parameter to pass the buffer size, so it doesn't accidentally exceed the available space. Reviewed by: melifaro Sponsored by: Rubicon Communications, LLC ("Netgate") Differential Revision: https://reviews.freebsd.org/D39874
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@ -55,7 +55,7 @@ static struct snl_attr_parser ap_carp_get[] = {
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{ .type = CARP_NL_STATE, .off = _OUT(carpr_state), .cb = snl_attr_get_uint32 },
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{ .type = CARP_NL_ADVBASE, .off = _OUT(carpr_advbase), .cb = snl_attr_get_int32 },
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{ .type = CARP_NL_ADVSKEW, .off = _OUT(carpr_advskew), .cb = snl_attr_get_int32 },
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{ .type = CARP_NL_KEY, .off = _OUT(carpr_key), .cb = snl_attr_get_string },
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{ .type = CARP_NL_KEY, .off = _OUT(carpr_key), .cb = snl_attr_copy_string, .arg_u32 = CARP_KEY_LEN },
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{ .type = CARP_NL_ADDR, .off = _OUT(carpr_addr), .cb = snl_attr_get_in_addr },
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{ .type = CARP_NL_ADDR6, .off = _OUT(carpr_addr6), .cb = snl_attr_get_in6_addr },
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};
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@ -176,6 +176,7 @@ ifconfig_carp_set_info(ifconfig_handle_t *h, const char *name,
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&carpr->carpr_addr);
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snl_add_msg_attr(&nw, CARP_NL_ADDR6, sizeof(carpr->carpr_addr6),
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&carpr->carpr_addr6);
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snl_add_msg_attr_string(&nw, CARP_NL_KEY, carpr->carpr_key);
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hdr = snl_finalize_msg(&nw);
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if (hdr == NULL) {
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@ -138,7 +138,12 @@ struct snl_attr_parser {
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uint16_t type; /* Attribute type */
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uint16_t off; /* field offset in the target structure */
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snl_parse_attr_f *cb; /* parser function to call */
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const void *arg; /* Optional argument parser */
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/* Optional parser argument */
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union {
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const void *arg;
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const uint32_t arg_u32;
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};
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};
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struct snl_hdr_parser {
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@ -588,6 +593,19 @@ snl_attr_get_stringn(struct snl_state *ss, struct nlattr *nla,
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return (true);
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}
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static inline bool
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snl_attr_copy_string(struct snl_state *ss, struct nlattr *nla,
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const void *arg, void *target)
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{
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char *tmp;
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if (snl_attr_get_string(ss, nla, NULL, &tmp)) {
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strlcpy(target, tmp, (size_t)arg);
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return (true);
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}
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return (false);
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}
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static inline bool
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snl_attr_get_nested(struct snl_state *ss, struct nlattr *nla, const void *arg, void *target)
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{
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