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Lines 164-171
dhcp_printoptions(const struct dhcpcd_ctx *ctx,
Link Here
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| 164 |
} |
164 |
} |
| 165 |
} |
165 |
} |
| 166 |
|
166 |
|
| 167 |
#define get_option_raw(ctx, bootp, bootp_len, opt) \ |
|
|
| 168 |
get_option((ctx), (bootp), (bootp_len), NULL) |
| 169 |
static const uint8_t * |
167 |
static const uint8_t * |
| 170 |
get_option(struct dhcpcd_ctx *ctx, |
168 |
get_option(struct dhcpcd_ctx *ctx, |
| 171 |
const struct bootp *bootp, size_t bootp_len, |
169 |
const struct bootp *bootp, size_t bootp_len, |
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Lines 3277-3283
is_packet_udp_bootp(void *packet, size_t plen)
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| 3277 |
size_t ip_hlen; |
3275 |
size_t ip_hlen; |
| 3278 |
struct udphdr *udp; |
3276 |
struct udphdr *udp; |
| 3279 |
|
3277 |
|
| 3280 |
if (sizeof(*ip) > plen) |
3278 |
if (plen < sizeof(*ip)) |
| 3281 |
return false; |
3279 |
return false; |
| 3282 |
|
3280 |
|
| 3283 |
if (ip->ip_v != IPVERSION || ip->ip_p != IPPROTO_UDP) |
3281 |
if (ip->ip_v != IPVERSION || ip->ip_p != IPPROTO_UDP) |
|
Lines 3288-3299
is_packet_udp_bootp(void *packet, size_t plen)
Link Here
|
| 3288 |
return false; |
3286 |
return false; |
| 3289 |
|
3287 |
|
| 3290 |
ip_hlen = (size_t)ip->ip_hl * 4; |
3288 |
ip_hlen = (size_t)ip->ip_hl * 4; |
|
|
3289 |
if (ip_hlen < sizeof(*ip)) |
| 3290 |
return false; |
| 3291 |
|
| 3291 |
/* Check we have a UDP header and BOOTP. */ |
3292 |
/* Check we have a UDP header and BOOTP. */ |
| 3292 |
if (ip_hlen + sizeof(*udp) + offsetof(struct bootp, vend) > plen) |
3293 |
if (ip_hlen + sizeof(*udp) + offsetof(struct bootp, vend) > plen) |
| 3293 |
return false; |
3294 |
return false; |
| 3294 |
|
3295 |
|
| 3295 |
/* Check it's to and from the right ports. */ |
3296 |
/* Sanity. */ |
| 3296 |
udp = (struct udphdr *)(void *)((char *)ip + ip_hlen); |
3297 |
udp = (struct udphdr *)(void *)((char *)ip + ip_hlen); |
|
|
3298 |
if (ntohs(udp->uh_ulen) < sizeof(*udp)) |
| 3299 |
return false; |
| 3300 |
if (ip_hlen + ntohs(udp->uh_ulen) != plen) |
| 3301 |
return false; |
| 3302 |
|
| 3303 |
/* Check it's to and from the right ports. */ |
| 3297 |
if (udp->uh_dport != htons(BOOTPC) || udp->uh_sport != htons(BOOTPS)) |
3304 |
if (udp->uh_dport != htons(BOOTPC) || udp->uh_sport != htons(BOOTPS)) |
| 3298 |
return false; |
3305 |
return false; |
| 3299 |
|
3306 |
|
|
Lines 3324-3334
checksums_valid(void *packet,
Link Here
|
| 3324 |
return false; |
3331 |
return false; |
| 3325 |
|
3332 |
|
| 3326 |
if (flags & BPF_PARTIALCSUM) |
3333 |
if (flags & BPF_PARTIALCSUM) |
| 3327 |
return 0; |
3334 |
return true; |
| 3328 |
|
3335 |
|
| 3329 |
udp = (struct udphdr *)(void *)((char *)ip + ip_hlen); |
3336 |
udp = (struct udphdr *)(void *)((char *)ip + ip_hlen); |
| 3330 |
if (udp->uh_sum == 0) |
3337 |
if (udp->uh_sum == 0) |
| 3331 |
return 0; |
3338 |
return true; |
| 3332 |
|
3339 |
|
| 3333 |
/* UDP checksum is based on a pseudo IP header alongside |
3340 |
/* UDP checksum is based on a pseudo IP header alongside |
| 3334 |
* the UDP header and payload. */ |
3341 |
* the UDP header and payload. */ |
