diff options
Diffstat (limited to 'nest/a-path.c')
| -rw-r--r-- | nest/a-path.c | 59 |
1 files changed, 18 insertions, 41 deletions
diff --git a/nest/a-path.c b/nest/a-path.c index c804619..396d463 100644 --- a/nest/a-path.c +++ b/nest/a-path.c @@ -16,53 +16,36 @@ #include "filter/filter.h" -/* Global AS4 support, shared by all BGP instances. - * This specifies whether BA_AS_PATH attributes contain 2 or 4 B per ASN - */ - -int bgp_as4_support = 1; +// static inline void put_as(byte *data, u32 as) { put_u32(data, as); } +// static inline u32 get_as(byte *data) { return get_u32(data); } -static void -put_as(byte *data, u32 as) -{ - if (bgp_as4_support) - put_u32(data, as); - else if (as <= 0xFFFF) - put_u16(data, as); - else - bug("put_as: Try to put 32bit AS to 16bit AS Path"); -} - -static inline u32 -get_as(byte *data) -{ - return bgp_as4_support ? get_u32(data) : get_u16(data); -} +#define put_as put_u32 +#define get_as get_u32 +#define BS 4 struct adata * as_path_prepend(struct linpool *pool, struct adata *olda, u32 as) { - int bs = bgp_as4_support ? 4 : 2; struct adata *newa; if (olda->length && olda->data[0] == AS_PATH_SEQUENCE && olda->data[1] < 255) /* Starting with sequence => just prepend the AS number */ { - int nl = olda->length + bs; + int nl = olda->length + BS; newa = lp_alloc(pool, sizeof(struct adata) + nl); newa->length = nl; newa->data[0] = AS_PATH_SEQUENCE; newa->data[1] = olda->data[1] + 1; - memcpy(newa->data + bs + 2, olda->data + 2, olda->length - 2); + memcpy(newa->data + BS + 2, olda->data + 2, olda->length - 2); } else /* Create new path segment */ { - int nl = olda->length + bs + 2; + int nl = olda->length + BS + 2; newa = lp_alloc(pool, sizeof(struct adata) + nl); newa->length = nl; newa->data[0] = AS_PATH_SEQUENCE; newa->data[1] = 1; - memcpy(newa->data + bs + 2, olda->data, olda->length); + memcpy(newa->data + BS + 2, olda->data, olda->length); } put_as(newa->data + 2, as); return newa; @@ -144,7 +127,6 @@ as_path_convert_to_new(struct adata *path, byte *dst, int req_as) void as_path_format(struct adata *path, byte *buf, unsigned int size) { - int bs = bgp_as4_support ? 4 : 2; byte *p = path->data; byte *e = p + path->length; byte *end = buf + size - 16; @@ -172,7 +154,7 @@ as_path_format(struct adata *path, byte *buf, unsigned int size) if (!sp) *buf++ = ' '; buf += bsprintf(buf, "%u", get_as(p)); - p += bs; + p += BS; sp = 0; } if (isset) @@ -188,8 +170,7 @@ as_path_format(struct adata *path, byte *buf, unsigned int size) int as_path_getlen(struct adata *path) { - int bs = bgp_as4_support ? 4 : 2; - return as_path_getlen_int(path, bs); + return as_path_getlen_int(path, BS); } int @@ -215,7 +196,6 @@ as_path_getlen_int(struct adata *path, int bs) int as_path_get_last(struct adata *path, u32 *orig_as) { - int bs = bgp_as4_support ? 4 : 2; int found = 0; u32 res = 0; u8 *p = path->data; @@ -230,15 +210,15 @@ as_path_get_last(struct adata *path, u32 *orig_as) if (len = *p++) { found = 0; - p += bs * len; + p += BS * len; } break; case AS_PATH_SEQUENCE: if (len = *p++) { found = 1; - res = get_as(p + bs * (len - 1)); - p += bs * len; + res = get_as(p + BS * (len - 1)); + p += BS * len; } break; default: bug("as_path_get_first: Invalid path segment"); @@ -267,7 +247,6 @@ as_path_get_first(struct adata *path, u32 *last_as) int as_path_is_member(struct adata *path, u32 as) { - int bs = bgp_as4_support ? 4 : 2; u8 *p = path->data; u8 *q = p+path->length; int i, n; @@ -280,7 +259,7 @@ as_path_is_member(struct adata *path, u32 as) { if (get_as(p) == as) return 1; - p += bs; + p += BS; } } return 0; @@ -301,7 +280,6 @@ struct pm_pos static int parse_path(struct adata *path, struct pm_pos *pos) { - int bs = bgp_as4_support ? 4 : 2; u8 *p = path->data; u8 *q = p + path->length; struct pm_pos *opos = pos; @@ -316,7 +294,7 @@ parse_path(struct adata *path, struct pm_pos *pos) pos->mark = 0; pos->val.sp = p; len = *p; - p += 1 + bs * len; + p += 1 + BS * len; pos++; break; @@ -327,7 +305,7 @@ parse_path(struct adata *path, struct pm_pos *pos) pos->set = 0; pos->mark = 0; pos->val.asn = get_as(p); - p += bs; + p += BS; pos++; } break; @@ -346,13 +324,12 @@ pm_match(struct pm_pos *pos, u32 asn) if (! pos->set) return pos->val.asn == asn; - int bs = bgp_as4_support ? 4 : 2; u8 *p = pos->val.sp; int len = *p++; int i; for (i = 0; i < len; i++) - if (get_as(p + i * bs) == asn) + if (get_as(p + i * BS) == asn) return 1; return 0; |